llvm-project/clang/lib/Sema/SemaDecl.cpp

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//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements semantic analysis for declarations.
//
//===----------------------------------------------------------------------===//
#include "Sema.h"
Reimplement reference initialization (C++ [dcl.init.ref]) using the new notion of an "initialization sequence", which encapsulates the computation of the initialization sequence along with diagnostic information and the capability to turn the computed sequence into an expression. At present, I've only switched one CheckReferenceInit callers over to this new mechanism; more will follow. Aside from (hopefully) being much more true to the standard, the diagnostics provided by this reference-initialization code are a bit better than before. Some examples: p5-var.cpp:54:12: error: non-const lvalue reference to type 'struct Derived' cannot bind to a value of unrelated type 'struct Base' Derived &dr2 = b; // expected-error{{non-const lvalue reference to ... ^ ~ p5-var.cpp:55:9: error: binding of reference to type 'struct Base' to a value of type 'struct Base const' drops qualifiers Base &br3 = bc; // expected-error{{drops qualifiers}} ^ ~~ p5-var.cpp:57:15: error: ambiguous conversion from derived class 'struct Diamond' to base class 'struct Base': struct Diamond -> struct Derived -> struct Base struct Diamond -> struct Derived2 -> struct Base Base &br5 = diamond; // expected-error{{ambiguous conversion from ... ^~~~~~~ p5-var.cpp:59:9: error: non-const lvalue reference to type 'long' cannot bind to a value of unrelated type 'int' long &lr = i; // expected-error{{non-const lvalue reference to type ... ^ ~ p5-var.cpp:74:9: error: non-const lvalue reference to type 'struct Base' cannot bind to a temporary of type 'struct Base' Base &br1 = Base(); // expected-error{{non-const lvalue reference to ... ^ ~~~~~~ p5-var.cpp:102:9: error: non-const reference cannot bind to bit-field 'i' int & ir1 = (ib.i); // expected-error{{non-const reference cannot ... ^ ~~~~~~ p5-var.cpp:98:7: note: bit-field is declared here int i : 17; // expected-note{{bit-field is declared here}} ^ llvm-svn: 90992
2009-12-10 07:02:17 +08:00
#include "SemaInit.h"
#include "Lookup.h"
#include "clang/AST/APValue.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/StmtCXX.h"
#include "clang/Parse/DeclSpec.h"
#include "clang/Parse/ParseDiagnostic.h"
#include "clang/Parse/Template.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's)
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/HeaderSearch.h"
#include "llvm/ADT/Triple.h"
#include <algorithm>
#include <cstring>
#include <functional>
using namespace clang;
/// getDeclName - Return a pretty name for the specified decl if possible, or
/// an empty string if not. This is used for pretty crash reporting.
std::string Sema::getDeclName(DeclPtrTy d) {
Decl *D = d.getAs<Decl>();
if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D))
return DN->getQualifiedNameAsString();
return "";
}
Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) {
return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>()));
}
/// \brief If the identifier refers to a type name within this scope,
/// return the declaration of that type.
///
/// This routine performs ordinary name lookup of the identifier II
/// within the given scope, with optional C++ scope specifier SS, to
/// determine whether the name refers to a type. If so, returns an
/// opaque pointer (actually a QualType) corresponding to that
/// type. Otherwise, returns NULL.
///
/// If name lookup results in an ambiguity, this routine will complain
/// and then return NULL.
Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc,
Scope *S, CXXScopeSpec *SS,
bool isClassName,
TypeTy *ObjectTypePtr) {
// Determine where we will perform name lookup.
DeclContext *LookupCtx = 0;
if (ObjectTypePtr) {
QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr);
if (ObjectType->isRecordType())
LookupCtx = computeDeclContext(ObjectType);
} else if (SS && SS->isNotEmpty()) {
LookupCtx = computeDeclContext(*SS, false);
if (!LookupCtx) {
if (isDependentScopeSpecifier(*SS)) {
// C++ [temp.res]p3:
// A qualified-id that refers to a type and in which the
// nested-name-specifier depends on a template-parameter (14.6.2)
// shall be prefixed by the keyword typename to indicate that the
// qualified-id denotes a type, forming an
// elaborated-type-specifier (7.1.5.3).
//
// We therefore do not perform any name lookup if the result would
// refer to a member of an unknown specialization.
if (!isClassName)
return 0;
// We know from the grammar that this name refers to a type, so build a
// DependentNameType node to describe the type.
// FIXME: Record somewhere that this DependentNameType node has no "typename"
// keyword associated with it.
return CheckTypenameType((NestedNameSpecifier *)SS->getScopeRep(),
II, SS->getRange()).getAsOpaquePtr();
}
return 0;
}
if (!LookupCtx->isDependentContext() && RequireCompleteDeclContext(*SS))
return 0;
}
// FIXME: LookupNestedNameSpecifierName isn't the right kind of
// lookup for class-names.
LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
LookupOrdinaryName;
LookupResult Result(*this, &II, NameLoc, Kind);
if (LookupCtx) {
// Perform "qualified" name lookup into the declaration context we
// computed, which is either the type of the base of a member access
// expression or the declaration context associated with a prior
// nested-name-specifier.
LookupQualifiedName(Result, LookupCtx);
if (ObjectTypePtr && Result.empty()) {
// C++ [basic.lookup.classref]p3:
// If the unqualified-id is ~type-name, the type-name is looked up
// in the context of the entire postfix-expression. If the type T of
// the object expression is of a class type C, the type-name is also
// looked up in the scope of class C. At least one of the lookups shall
// find a name that refers to (possibly cv-qualified) T.
LookupName(Result, S);
}
} else {
// Perform unqualified name lookup.
LookupName(Result, S);
}
NamedDecl *IIDecl = 0;
switch (Result.getResultKind()) {
case LookupResult::NotFound:
case LookupResult::NotFoundInCurrentInstantiation:
case LookupResult::FoundOverloaded:
case LookupResult::FoundUnresolvedValue:
Result.suppressDiagnostics();
return 0;
case LookupResult::Ambiguous:
// Recover from type-hiding ambiguities by hiding the type. We'll
// do the lookup again when looking for an object, and we can
// diagnose the error then. If we don't do this, then the error
// about hiding the type will be immediately followed by an error
// that only makes sense if the identifier was treated like a type.
if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
Result.suppressDiagnostics();
return 0;
}
// Look to see if we have a type anywhere in the list of results.
for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
Res != ResEnd; ++Res) {
if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
if (!IIDecl ||
(*Res)->getLocation().getRawEncoding() <
IIDecl->getLocation().getRawEncoding())
IIDecl = *Res;
}
}
if (!IIDecl) {
// None of the entities we found is a type, so there is no way
// to even assume that the result is a type. In this case, don't
// complain about the ambiguity. The parser will either try to
// perform this lookup again (e.g., as an object name), which
// will produce the ambiguity, or will complain that it expected
// a type name.
Result.suppressDiagnostics();
return 0;
}
// We found a type within the ambiguous lookup; diagnose the
// ambiguity and then return that type. This might be the right
// answer, or it might not be, but it suppresses any attempt to
// perform the name lookup again.
break;
case LookupResult::Found:
IIDecl = Result.getFoundDecl();
break;
}
assert(IIDecl && "Didn't find decl");
QualType T;
if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
DiagnoseUseOfDecl(IIDecl, NameLoc);
if (T.isNull())
T = Context.getTypeDeclType(TD);
if (SS)
T = getQualifiedNameType(*SS, T);
} else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
T = Context.getObjCInterfaceType(IDecl);
} else if (UnresolvedUsingTypenameDecl *UUDecl =
dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) {
// FIXME: preserve source structure information.
T = Context.getDependentNameType(ETK_None,
UUDecl->getTargetNestedNameSpecifier(),
&II);
} else {
// If it's not plausibly a type, suppress diagnostics.
Result.suppressDiagnostics();
return 0;
}
2009-03-19 08:18:19 +08:00
return T.getAsOpaquePtr();
}
/// isTagName() - This method is called *for error recovery purposes only*
/// to determine if the specified name is a valid tag name ("struct foo"). If
/// so, this returns the TST for the tag corresponding to it (TST_enum,
/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C
/// where the user forgot to specify the tag.
DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
// Do a tag name lookup in this scope.
LookupResult R(*this, &II, SourceLocation(), LookupTagName);
LookupName(R, S, false);
R.suppressDiagnostics();
if (R.getResultKind() == LookupResult::Found)
if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
switch (TD->getTagKind()) {
case TagDecl::TK_struct: return DeclSpec::TST_struct;
case TagDecl::TK_union: return DeclSpec::TST_union;
case TagDecl::TK_class: return DeclSpec::TST_class;
case TagDecl::TK_enum: return DeclSpec::TST_enum;
}
}
return DeclSpec::TST_unspecified;
}
bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II,
SourceLocation IILoc,
Scope *S,
CXXScopeSpec *SS,
TypeTy *&SuggestedType) {
// We don't have anything to suggest (yet).
SuggestedType = 0;
// There may have been a typo in the name of the type. Look up typo
// results, in case we have something that we can suggest.
LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName,
NotForRedeclaration);
// FIXME: It would be nice if we could correct for typos in built-in
// names, such as "itn" for "int".
if (CorrectTypo(Lookup, S, SS) && Lookup.isSingleResult()) {
NamedDecl *Result = Lookup.getAsSingle<NamedDecl>();
if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) &&
!Result->isInvalidDecl()) {
// We found a similarly-named type or interface; suggest that.
if (!SS || !SS->isSet())
Diag(IILoc, diag::err_unknown_typename_suggest)
<< &II << Lookup.getLookupName()
<< FixItHint::CreateReplacement(SourceRange(IILoc),
Result->getNameAsString());
else if (DeclContext *DC = computeDeclContext(*SS, false))
Diag(IILoc, diag::err_unknown_nested_typename_suggest)
<< &II << DC << Lookup.getLookupName() << SS->getRange()
<< FixItHint::CreateReplacement(SourceRange(IILoc),
Result->getNameAsString());
else
llvm_unreachable("could not have corrected a typo here");
Diag(Result->getLocation(), diag::note_previous_decl)
<< Result->getDeclName();
SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS);
return true;
}
}
if (getLangOptions().CPlusPlus) {
// See if II is a class template that the user forgot to pass arguments to.
UnqualifiedId Name;
Name.setIdentifier(&II, IILoc);
CXXScopeSpec EmptySS;
TemplateTy TemplateResult;
if (isTemplateName(S, SS ? *SS : EmptySS, Name, 0, true, TemplateResult)
== TNK_Type_template) {
TemplateName TplName = TemplateResult.getAsVal<TemplateName>();
Diag(IILoc, diag::err_template_missing_args) << TplName;
if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
Diag(TplDecl->getLocation(), diag::note_template_decl_here)
<< TplDecl->getTemplateParameters()->getSourceRange();
}
return true;
}
}
// FIXME: Should we move the logic that tries to recover from a missing tag
// (struct, union, enum) from Parser::ParseImplicitInt here, instead?
if (!SS || (!SS->isSet() && !SS->isInvalid()))
Diag(IILoc, diag::err_unknown_typename) << &II;
else if (DeclContext *DC = computeDeclContext(*SS, false))
Diag(IILoc, diag::err_typename_nested_not_found)
<< &II << DC << SS->getRange();
else if (isDependentScopeSpecifier(*SS)) {
Diag(SS->getRange().getBegin(), diag::err_typename_missing)
<< (NestedNameSpecifier *)SS->getScopeRep() << II.getName()
<< SourceRange(SS->getRange().getBegin(), IILoc)
<< FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get();
} else {
assert(SS && SS->isInvalid() &&
"Invalid scope specifier has already been diagnosed");
}
return true;
}
// Determines the context to return to after temporarily entering a
// context. This depends in an unnecessarily complicated way on the
// exact ordering of callbacks from the parser.
DeclContext *Sema::getContainingDC(DeclContext *DC) {
// Functions defined inline within classes aren't parsed until we've
// finished parsing the top-level class, so the top-level class is
// the context we'll need to return to.
if (isa<FunctionDecl>(DC)) {
DC = DC->getLexicalParent();
// A function not defined within a class will always return to its
// lexical context.
if (!isa<CXXRecordDecl>(DC))
return DC;
// A C++ inline method/friend is parsed *after* the topmost class
// it was declared in is fully parsed ("complete"); the topmost
// class is the context we need to return to.
while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
DC = RD;
// Return the declaration context of the topmost class the inline method is
// declared in.
return DC;
}
if (isa<ObjCMethodDecl>(DC))
return Context.getTranslationUnitDecl();
return DC->getLexicalParent();
}
void Sema::PushDeclContext(Scope *S, DeclContext *DC) {
assert(getContainingDC(DC) == CurContext &&
2008-12-08 15:14:51 +08:00
"The next DeclContext should be lexically contained in the current one.");
CurContext = DC;
S->setEntity(DC);
}
void Sema::PopDeclContext() {
assert(CurContext && "DeclContext imbalance!");
CurContext = getContainingDC(CurContext);
}
/// EnterDeclaratorContext - Used when we must lookup names in the context
/// of a declarator's nested name specifier.
///
void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
// C++0x [basic.lookup.unqual]p13:
// A name used in the definition of a static data member of class
// X (after the qualified-id of the static member) is looked up as
// if the name was used in a member function of X.
// C++0x [basic.lookup.unqual]p14:
// If a variable member of a namespace is defined outside of the
// scope of its namespace then any name used in the definition of
// the variable member (after the declarator-id) is looked up as
// if the definition of the variable member occurred in its
// namespace.
// Both of these imply that we should push a scope whose context
// is the semantic context of the declaration. We can't use
// PushDeclContext here because that context is not necessarily
// lexically contained in the current context. Fortunately,
// the containing scope should have the appropriate information.
assert(!S->getEntity() && "scope already has entity");
#ifndef NDEBUG
Scope *Ancestor = S->getParent();
while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
#endif
CurContext = DC;
S->setEntity(DC);
}
void Sema::ExitDeclaratorContext(Scope *S) {
assert(S->getEntity() == CurContext && "Context imbalance!");
// Switch back to the lexical context. The safety of this is
// enforced by an assert in EnterDeclaratorContext.
Scope *Ancestor = S->getParent();
while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
CurContext = (DeclContext*) Ancestor->getEntity();
// We don't need to do anything with the scope, which is going to
// disappear.
}
Initial implementation of function overloading in C. This commit adds a new attribute, "overloadable", that enables C++ function overloading in C. The attribute can only be added to function declarations, e.g., int *f(int) __attribute__((overloadable)); If the "overloadable" attribute exists on a function with a given name, *all* functions with that name (and in that scope) must have the "overloadable" attribute. Sets of overloaded functions with the "overloadable" attribute then follow the normal C++ rules for overloaded functions, e.g., overloads must have different parameter-type-lists from each other. When calling an overloaded function in C, we follow the same overloading rules as C++, with three extensions to the set of standard conversions: - A value of a given struct or union type T can be converted to the type T. This is just the identity conversion. (In C++, this would go through a copy constructor). - A value of pointer type T* can be converted to a value of type U* if T and U are compatible types. This conversion has Conversion rank (it's considered a pointer conversion in C). - A value of type T can be converted to a value of type U if T and U are compatible (and are not both pointer types). This conversion has Conversion rank (it's considered to be a new kind of conversion unique to C, a "compatible" conversion). Known defects (and, therefore, next steps): 1) The standard-conversion handling does not understand conversions involving _Complex or vector extensions, so it is likely to get these wrong. We need to add these conversions. 2) All overloadable functions with the same name will have the same linkage name, which means we'll get a collision in the linker (if not sooner). We'll need to mangle the names of these functions. llvm-svn: 64336
2009-02-12 07:02:49 +08:00
/// \brief Determine whether we allow overloading of the function
/// PrevDecl with another declaration.
///
/// This routine determines whether overloading is possible, not
/// whether some new function is actually an overload. It will return
/// true in C++ (where we can always provide overloads) or, as an
/// extension, in C when the previous function is already an
/// overloaded function declaration or has the "overloadable"
/// attribute.
static bool AllowOverloadingOfFunction(LookupResult &Previous,
ASTContext &Context) {
Initial implementation of function overloading in C. This commit adds a new attribute, "overloadable", that enables C++ function overloading in C. The attribute can only be added to function declarations, e.g., int *f(int) __attribute__((overloadable)); If the "overloadable" attribute exists on a function with a given name, *all* functions with that name (and in that scope) must have the "overloadable" attribute. Sets of overloaded functions with the "overloadable" attribute then follow the normal C++ rules for overloaded functions, e.g., overloads must have different parameter-type-lists from each other. When calling an overloaded function in C, we follow the same overloading rules as C++, with three extensions to the set of standard conversions: - A value of a given struct or union type T can be converted to the type T. This is just the identity conversion. (In C++, this would go through a copy constructor). - A value of pointer type T* can be converted to a value of type U* if T and U are compatible types. This conversion has Conversion rank (it's considered a pointer conversion in C). - A value of type T can be converted to a value of type U if T and U are compatible (and are not both pointer types). This conversion has Conversion rank (it's considered to be a new kind of conversion unique to C, a "compatible" conversion). Known defects (and, therefore, next steps): 1) The standard-conversion handling does not understand conversions involving _Complex or vector extensions, so it is likely to get these wrong. We need to add these conversions. 2) All overloadable functions with the same name will have the same linkage name, which means we'll get a collision in the linker (if not sooner). We'll need to mangle the names of these functions. llvm-svn: 64336
2009-02-12 07:02:49 +08:00
if (Context.getLangOptions().CPlusPlus)
return true;
if (Previous.getResultKind() == LookupResult::FoundOverloaded)
Initial implementation of function overloading in C. This commit adds a new attribute, "overloadable", that enables C++ function overloading in C. The attribute can only be added to function declarations, e.g., int *f(int) __attribute__((overloadable)); If the "overloadable" attribute exists on a function with a given name, *all* functions with that name (and in that scope) must have the "overloadable" attribute. Sets of overloaded functions with the "overloadable" attribute then follow the normal C++ rules for overloaded functions, e.g., overloads must have different parameter-type-lists from each other. When calling an overloaded function in C, we follow the same overloading rules as C++, with three extensions to the set of standard conversions: - A value of a given struct or union type T can be converted to the type T. This is just the identity conversion. (In C++, this would go through a copy constructor). - A value of pointer type T* can be converted to a value of type U* if T and U are compatible types. This conversion has Conversion rank (it's considered a pointer conversion in C). - A value of type T can be converted to a value of type U if T and U are compatible (and are not both pointer types). This conversion has Conversion rank (it's considered to be a new kind of conversion unique to C, a "compatible" conversion). Known defects (and, therefore, next steps): 1) The standard-conversion handling does not understand conversions involving _Complex or vector extensions, so it is likely to get these wrong. We need to add these conversions. 2) All overloadable functions with the same name will have the same linkage name, which means we'll get a collision in the linker (if not sooner). We'll need to mangle the names of these functions. llvm-svn: 64336
2009-02-12 07:02:49 +08:00
return true;
return (Previous.getResultKind() == LookupResult::Found
&& Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
Initial implementation of function overloading in C. This commit adds a new attribute, "overloadable", that enables C++ function overloading in C. The attribute can only be added to function declarations, e.g., int *f(int) __attribute__((overloadable)); If the "overloadable" attribute exists on a function with a given name, *all* functions with that name (and in that scope) must have the "overloadable" attribute. Sets of overloaded functions with the "overloadable" attribute then follow the normal C++ rules for overloaded functions, e.g., overloads must have different parameter-type-lists from each other. When calling an overloaded function in C, we follow the same overloading rules as C++, with three extensions to the set of standard conversions: - A value of a given struct or union type T can be converted to the type T. This is just the identity conversion. (In C++, this would go through a copy constructor). - A value of pointer type T* can be converted to a value of type U* if T and U are compatible types. This conversion has Conversion rank (it's considered a pointer conversion in C). - A value of type T can be converted to a value of type U if T and U are compatible (and are not both pointer types). This conversion has Conversion rank (it's considered to be a new kind of conversion unique to C, a "compatible" conversion). Known defects (and, therefore, next steps): 1) The standard-conversion handling does not understand conversions involving _Complex or vector extensions, so it is likely to get these wrong. We need to add these conversions. 2) All overloadable functions with the same name will have the same linkage name, which means we'll get a collision in the linker (if not sooner). We'll need to mangle the names of these functions. llvm-svn: 64336
2009-02-12 07:02:49 +08:00
}
/// Add this decl to the scope shadowed decl chains.
void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
// Move up the scope chain until we find the nearest enclosing
// non-transparent context. The declaration will be introduced into this
// scope.
while (S->getEntity() &&
((DeclContext *)S->getEntity())->isTransparentContext())
S = S->getParent();
// Add scoped declarations into their context, so that they can be
// found later. Declarations without a context won't be inserted
// into any context.
if (AddToContext)
CurContext->addDecl(D);
// Out-of-line definitions shouldn't be pushed into scope in C++.
// Out-of-line variable and function definitions shouldn't even in C.
if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) &&
D->isOutOfLine())
return;
// Template instantiations should also not be pushed into scope.
if (isa<FunctionDecl>(D) &&
cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
return;
// If this replaces anything in the current scope,
IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
IEnd = IdResolver.end();
for (; I != IEnd; ++I) {
if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) {
S->RemoveDecl(DeclPtrTy::make(*I));
IdResolver.RemoveDecl(*I);
// Should only need to replace one decl.
break;
}
}
S->AddDecl(DeclPtrTy::make(D));
IdResolver.AddDecl(D);
}
bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) {
return IdResolver.isDeclInScope(D, Ctx, Context, S);
}
static bool isOutOfScopePreviousDeclaration(NamedDecl *,
DeclContext*,
ASTContext&);
/// Filters out lookup results that don't fall within the given scope
/// as determined by isDeclInScope.
static void FilterLookupForScope(Sema &SemaRef, LookupResult &R,
DeclContext *Ctx, Scope *S,
bool ConsiderLinkage) {
LookupResult::Filter F = R.makeFilter();
while (F.hasNext()) {
NamedDecl *D = F.next();
if (SemaRef.isDeclInScope(D, Ctx, S))
continue;
if (ConsiderLinkage &&
isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context))
continue;
F.erase();
}
F.done();
}
static bool isUsingDecl(NamedDecl *D) {
return isa<UsingShadowDecl>(D) ||
isa<UnresolvedUsingTypenameDecl>(D) ||
isa<UnresolvedUsingValueDecl>(D);
}
/// Removes using shadow declarations from the lookup results.
static void RemoveUsingDecls(LookupResult &R) {
LookupResult::Filter F = R.makeFilter();
while (F.hasNext())
if (isUsingDecl(F.next()))
F.erase();
F.done();
}
static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
if (D->isInvalidDecl())
return false;
if (D->isUsed() || D->hasAttr<UnusedAttr>())
return false;
// White-list anything that isn't a local variable.
if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) ||
!D->getDeclContext()->isFunctionOrMethod())
return false;
// Types of valid local variables should be complete, so this should succeed.
if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
// White-list anything with an __attribute__((unused)) type.
QualType Ty = VD->getType();
// Only look at the outermost level of typedef.
if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) {
if (TT->getDecl()->hasAttr<UnusedAttr>())
return false;
}
if (const TagType *TT = Ty->getAs<TagType>()) {
const TagDecl *Tag = TT->getDecl();
if (Tag->hasAttr<UnusedAttr>())
return false;
if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
if (!RD->hasTrivialConstructor())
return false;
if (!RD->hasTrivialDestructor())
return false;
}
}
// TODO: __attribute__((unused)) templates?
}
return true;
}
void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
if (S->decl_empty()) return;
assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
"Scope shouldn't contain decls!");
for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
I != E; ++I) {
Decl *TmpD = (*I).getAs<Decl>();
assert(TmpD && "This decl didn't get pushed??");
assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
NamedDecl *D = cast<NamedDecl>(TmpD);
if (!D->getDeclName()) continue;
// Diagnose unused variables in this scope.
if (ShouldDiagnoseUnusedDecl(D) &&
S->getNumErrorsAtStart() == getDiagnostics().getNumErrors())
Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName();
// Remove this name from our lexical scope.
IdResolver.RemoveDecl(D);
}
}
/// getObjCInterfaceDecl - Look up a for a class declaration in the scope.
/// return 0 if one not found.
///
/// \param Id the name of the Objective-C class we're looking for. If
/// typo-correction fixes this name, the Id will be updated
/// to the fixed name.
///
/// \param RecoverLoc if provided, this routine will attempt to
/// recover from a typo in the name of an existing Objective-C class
/// and, if successful, will return the lookup that results from
/// typo-correction.
ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
SourceLocation RecoverLoc) {
// The third "scope" argument is 0 since we aren't enabling lazy built-in
// creation from this context.
NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName);
if (!IDecl && !RecoverLoc.isInvalid()) {
// Perform typo correction at the given location, but only if we
// find an Objective-C class name.
LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName);
if (CorrectTypo(R, TUScope, 0) &&
(IDecl = R.getAsSingle<ObjCInterfaceDecl>())) {
Diag(RecoverLoc, diag::err_undef_interface_suggest)
<< Id << IDecl->getDeclName()
<< FixItHint::CreateReplacement(RecoverLoc, IDecl->getNameAsString());
Diag(IDecl->getLocation(), diag::note_previous_decl)
<< IDecl->getDeclName();
Id = IDecl->getIdentifier();
}
}
return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
}
/// getNonFieldDeclScope - Retrieves the innermost scope, starting
/// from S, where a non-field would be declared. This routine copes
/// with the difference between C and C++ scoping rules in structs and
/// unions. For example, the following code is well-formed in C but
/// ill-formed in C++:
/// @code
/// struct S6 {
/// enum { BAR } e;
/// };
///
/// void test_S6() {
/// struct S6 a;
/// a.e = BAR;
/// }
/// @endcode
/// For the declaration of BAR, this routine will return a different
/// scope. The scope S will be the scope of the unnamed enumeration
/// within S6. In C++, this routine will return the scope associated
/// with S6, because the enumeration's scope is a transparent
/// context but structures can contain non-field names. In C, this
/// routine will return the translation unit scope, since the
/// enumeration's scope is a transparent context and structures cannot
/// contain non-field names.
Scope *Sema::getNonFieldDeclScope(Scope *S) {
while (((S->getFlags() & Scope::DeclScope) == 0) ||
(S->getEntity() &&
((DeclContext *)S->getEntity())->isTransparentContext()) ||
(S->isClassScope() && !getLangOptions().CPlusPlus))
S = S->getParent();
return S;
}
void Sema::InitBuiltinVaListType() {
if (!Context.getBuiltinVaListType().isNull())
return;
IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list");
NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName);
TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl);
Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef));
}
Implicitly declare certain C library functions (malloc, strcpy, memmove, etc.) when we perform name lookup on them. This ensures that we produce the correct signature for these functions, which has two practical impacts: 1) When we're supporting the "implicit function declaration" feature of C99, these functions will be implicitly declared with the right signature rather than as a function returning "int" with no prototype. See PR3541 for the reason why this is important (hint: GCC always predeclares these functions). 2) If users attempt to redeclare one of these library functions with an incompatible signature, we produce a hard error. This patch does a little bit of work to give reasonable error messages. For example, when we hit case #1 we complain that we're implicitly declaring this function with a specific signature, and then we give a note that asks the user to include the appropriate header (e.g., "please include <stdlib.h> or explicitly declare 'malloc'"). In case #2, we show the type of the implicit builtin that was incorrectly declared, so the user can see the problem. We could do better here: for example, when displaying this latter error message we say something like: 'strcpy' was implicitly declared here with type 'char *(char *, char const *)' but we should really print out a fake code line showing the declaration, like this: 'strcpy' was implicitly declared here as: char *strcpy(char *, char const *) This would also be good for printing built-in candidates with C++ operator overloading. The set of C library functions supported by this patch includes all functions from the C99 specification's <stdlib.h> and <string.h> that (a) are predefined by GCC and (b) have signatures that could cause codegen issues if they are treated as functions with no prototype returning and int. Future work could extend this set of functions to other C library functions that we know about. llvm-svn: 64504
2009-02-14 07:20:09 +08:00
/// LazilyCreateBuiltin - The specified Builtin-ID was first used at
/// file scope. lazily create a decl for it. ForRedeclaration is true
/// if we're creating this built-in in anticipation of redeclaring the
/// built-in.
NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
Implicitly declare certain C library functions (malloc, strcpy, memmove, etc.) when we perform name lookup on them. This ensures that we produce the correct signature for these functions, which has two practical impacts: 1) When we're supporting the "implicit function declaration" feature of C99, these functions will be implicitly declared with the right signature rather than as a function returning "int" with no prototype. See PR3541 for the reason why this is important (hint: GCC always predeclares these functions). 2) If users attempt to redeclare one of these library functions with an incompatible signature, we produce a hard error. This patch does a little bit of work to give reasonable error messages. For example, when we hit case #1 we complain that we're implicitly declaring this function with a specific signature, and then we give a note that asks the user to include the appropriate header (e.g., "please include <stdlib.h> or explicitly declare 'malloc'"). In case #2, we show the type of the implicit builtin that was incorrectly declared, so the user can see the problem. We could do better here: for example, when displaying this latter error message we say something like: 'strcpy' was implicitly declared here with type 'char *(char *, char const *)' but we should really print out a fake code line showing the declaration, like this: 'strcpy' was implicitly declared here as: char *strcpy(char *, char const *) This would also be good for printing built-in candidates with C++ operator overloading. The set of C library functions supported by this patch includes all functions from the C99 specification's <stdlib.h> and <string.h> that (a) are predefined by GCC and (b) have signatures that could cause codegen issues if they are treated as functions with no prototype returning and int. Future work could extend this set of functions to other C library functions that we know about. llvm-svn: 64504
2009-02-14 07:20:09 +08:00
Scope *S, bool ForRedeclaration,
SourceLocation Loc) {
Builtin::ID BID = (Builtin::ID)bid;
if (Context.BuiltinInfo.hasVAListUse(BID))
InitBuiltinVaListType();
Implicitly declare certain C library functions (malloc, strcpy, memmove, etc.) when we perform name lookup on them. This ensures that we produce the correct signature for these functions, which has two practical impacts: 1) When we're supporting the "implicit function declaration" feature of C99, these functions will be implicitly declared with the right signature rather than as a function returning "int" with no prototype. See PR3541 for the reason why this is important (hint: GCC always predeclares these functions). 2) If users attempt to redeclare one of these library functions with an incompatible signature, we produce a hard error. This patch does a little bit of work to give reasonable error messages. For example, when we hit case #1 we complain that we're implicitly declaring this function with a specific signature, and then we give a note that asks the user to include the appropriate header (e.g., "please include <stdlib.h> or explicitly declare 'malloc'"). In case #2, we show the type of the implicit builtin that was incorrectly declared, so the user can see the problem. We could do better here: for example, when displaying this latter error message we say something like: 'strcpy' was implicitly declared here with type 'char *(char *, char const *)' but we should really print out a fake code line showing the declaration, like this: 'strcpy' was implicitly declared here as: char *strcpy(char *, char const *) This would also be good for printing built-in candidates with C++ operator overloading. The set of C library functions supported by this patch includes all functions from the C99 specification's <stdlib.h> and <string.h> that (a) are predefined by GCC and (b) have signatures that could cause codegen issues if they are treated as functions with no prototype returning and int. Future work could extend this set of functions to other C library functions that we know about. llvm-svn: 64504
2009-02-14 07:20:09 +08:00
ASTContext::GetBuiltinTypeError Error;
QualType R = Context.GetBuiltinType(BID, Error);
switch (Error) {
case ASTContext::GE_None:
// Okay
break;
case ASTContext::GE_Missing_stdio:
if (ForRedeclaration)
Diag(Loc, diag::err_implicit_decl_requires_stdio)
<< Context.BuiltinInfo.GetName(BID);
return 0;
case ASTContext::GE_Missing_setjmp:
if (ForRedeclaration)
Diag(Loc, diag::err_implicit_decl_requires_setjmp)
<< Context.BuiltinInfo.GetName(BID);
return 0;
}
Implicitly declare certain C library functions (malloc, strcpy, memmove, etc.) when we perform name lookup on them. This ensures that we produce the correct signature for these functions, which has two practical impacts: 1) When we're supporting the "implicit function declaration" feature of C99, these functions will be implicitly declared with the right signature rather than as a function returning "int" with no prototype. See PR3541 for the reason why this is important (hint: GCC always predeclares these functions). 2) If users attempt to redeclare one of these library functions with an incompatible signature, we produce a hard error. This patch does a little bit of work to give reasonable error messages. For example, when we hit case #1 we complain that we're implicitly declaring this function with a specific signature, and then we give a note that asks the user to include the appropriate header (e.g., "please include <stdlib.h> or explicitly declare 'malloc'"). In case #2, we show the type of the implicit builtin that was incorrectly declared, so the user can see the problem. We could do better here: for example, when displaying this latter error message we say something like: 'strcpy' was implicitly declared here with type 'char *(char *, char const *)' but we should really print out a fake code line showing the declaration, like this: 'strcpy' was implicitly declared here as: char *strcpy(char *, char const *) This would also be good for printing built-in candidates with C++ operator overloading. The set of C library functions supported by this patch includes all functions from the C99 specification's <stdlib.h> and <string.h> that (a) are predefined by GCC and (b) have signatures that could cause codegen issues if they are treated as functions with no prototype returning and int. Future work could extend this set of functions to other C library functions that we know about. llvm-svn: 64504
2009-02-14 07:20:09 +08:00
if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
Diag(Loc, diag::ext_implicit_lib_function_decl)
<< Context.BuiltinInfo.GetName(BID)
<< R;
if (Context.BuiltinInfo.getHeaderName(BID) &&
Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl)
!= Diagnostic::Ignored)
Implicitly declare certain C library functions (malloc, strcpy, memmove, etc.) when we perform name lookup on them. This ensures that we produce the correct signature for these functions, which has two practical impacts: 1) When we're supporting the "implicit function declaration" feature of C99, these functions will be implicitly declared with the right signature rather than as a function returning "int" with no prototype. See PR3541 for the reason why this is important (hint: GCC always predeclares these functions). 2) If users attempt to redeclare one of these library functions with an incompatible signature, we produce a hard error. This patch does a little bit of work to give reasonable error messages. For example, when we hit case #1 we complain that we're implicitly declaring this function with a specific signature, and then we give a note that asks the user to include the appropriate header (e.g., "please include <stdlib.h> or explicitly declare 'malloc'"). In case #2, we show the type of the implicit builtin that was incorrectly declared, so the user can see the problem. We could do better here: for example, when displaying this latter error message we say something like: 'strcpy' was implicitly declared here with type 'char *(char *, char const *)' but we should really print out a fake code line showing the declaration, like this: 'strcpy' was implicitly declared here as: char *strcpy(char *, char const *) This would also be good for printing built-in candidates with C++ operator overloading. The set of C library functions supported by this patch includes all functions from the C99 specification's <stdlib.h> and <string.h> that (a) are predefined by GCC and (b) have signatures that could cause codegen issues if they are treated as functions with no prototype returning and int. Future work could extend this set of functions to other C library functions that we know about. llvm-svn: 64504
2009-02-14 07:20:09 +08:00
Diag(Loc, diag::note_please_include_header)
<< Context.BuiltinInfo.getHeaderName(BID)
<< Context.BuiltinInfo.GetName(BID);
}
FunctionDecl *New = FunctionDecl::Create(Context,
Context.getTranslationUnitDecl(),
Loc, II, R, /*TInfo=*/0,
FunctionDecl::Extern, false,
/*hasPrototype=*/true);
Implicitly declare certain C library functions (malloc, strcpy, memmove, etc.) when we perform name lookup on them. This ensures that we produce the correct signature for these functions, which has two practical impacts: 1) When we're supporting the "implicit function declaration" feature of C99, these functions will be implicitly declared with the right signature rather than as a function returning "int" with no prototype. See PR3541 for the reason why this is important (hint: GCC always predeclares these functions). 2) If users attempt to redeclare one of these library functions with an incompatible signature, we produce a hard error. This patch does a little bit of work to give reasonable error messages. For example, when we hit case #1 we complain that we're implicitly declaring this function with a specific signature, and then we give a note that asks the user to include the appropriate header (e.g., "please include <stdlib.h> or explicitly declare 'malloc'"). In case #2, we show the type of the implicit builtin that was incorrectly declared, so the user can see the problem. We could do better here: for example, when displaying this latter error message we say something like: 'strcpy' was implicitly declared here with type 'char *(char *, char const *)' but we should really print out a fake code line showing the declaration, like this: 'strcpy' was implicitly declared here as: char *strcpy(char *, char const *) This would also be good for printing built-in candidates with C++ operator overloading. The set of C library functions supported by this patch includes all functions from the C99 specification's <stdlib.h> and <string.h> that (a) are predefined by GCC and (b) have signatures that could cause codegen issues if they are treated as functions with no prototype returning and int. Future work could extend this set of functions to other C library functions that we know about. llvm-svn: 64504
2009-02-14 07:20:09 +08:00
New->setImplicit();
// Create Decl objects for each parameter, adding them to the
// FunctionDecl.
if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
llvm::SmallVector<ParmVarDecl*, 16> Params;
for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i)
Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0,
FT->getArgType(i), /*TInfo=*/0,
VarDecl::None, 0));
New->setParams(Params.data(), Params.size());
}
AddKnownFunctionAttributes(New);
// TUScope is the translation-unit scope to insert this function into.
// FIXME: This is hideous. We need to teach PushOnScopeChains to
// relate Scopes to DeclContexts, and probably eliminate CurContext
// entirely, but we're not there yet.
DeclContext *SavedContext = CurContext;
CurContext = Context.getTranslationUnitDecl();
PushOnScopeChains(New, TUScope);
CurContext = SavedContext;
return New;
}
/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the
/// same name and scope as a previous declaration 'Old'. Figure out
/// how to resolve this situation, merging decls or emitting
/// diagnostics as appropriate. If there was an error, set New to be invalid.
///
void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) {
// If the new decl is known invalid already, don't bother doing any
// merging checks.
if (New->isInvalidDecl()) return;
// Allow multiple definitions for ObjC built-in typedefs.
// FIXME: Verify the underlying types are equivalent!
if (getLangOptions().ObjC1) {
const IdentifierInfo *TypeID = New->getIdentifier();
switch (TypeID->getLength()) {
default: break;
case 2:
if (!TypeID->isStr("id"))
break;
Context.ObjCIdRedefinitionType = New->getUnderlyingType();
// Install the built-in type for 'id', ignoring the current definition.
New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
return;
case 5:
if (!TypeID->isStr("Class"))
break;
Context.ObjCClassRedefinitionType = New->getUnderlyingType();
// Install the built-in type for 'Class', ignoring the current definition.
New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
return;
case 3:
if (!TypeID->isStr("SEL"))
break;
Context.ObjCSelRedefinitionType = New->getUnderlyingType();
// Install the built-in type for 'SEL', ignoring the current definition.
New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
return;
case 8:
if (!TypeID->isStr("Protocol"))
break;
Context.setObjCProtoType(New->getUnderlyingType());
return;
}
// Fall through - the typedef name was not a builtin type.
}
// Verify the old decl was also a type.
TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
if (!Old) {
Diag(New->getLocation(), diag::err_redefinition_different_kind)
<< New->getDeclName();
NamedDecl *OldD = OldDecls.getRepresentativeDecl();
if (OldD->getLocation().isValid())
Diag(OldD->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
// If the old declaration is invalid, just give up here.
if (Old->isInvalidDecl())
return New->setInvalidDecl();
// Determine the "old" type we'll use for checking and diagnostics.
QualType OldType;
if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old))
OldType = OldTypedef->getUnderlyingType();
else
OldType = Context.getTypeDeclType(Old);
// If the typedef types are not identical, reject them in all languages and
// with any extensions enabled.
if (OldType != New->getUnderlyingType() &&
Context.getCanonicalType(OldType) !=
Context.getCanonicalType(New->getUnderlyingType())) {
Diag(New->getLocation(), diag::err_redefinition_different_typedef)
<< New->getUnderlyingType() << OldType;
if (Old->getLocation().isValid())
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
// The types match. Link up the redeclaration chain if the old
// declaration was a typedef.
// FIXME: this is a potential source of wierdness if the type
// spellings don't match exactly.
if (isa<TypedefDecl>(Old))
New->setPreviousDeclaration(cast<TypedefDecl>(Old));
if (getLangOptions().Microsoft)
return;
if (getLangOptions().CPlusPlus) {
// C++ [dcl.typedef]p2:
// In a given non-class scope, a typedef specifier can be used to
// redefine the name of any type declared in that scope to refer
// to the type to which it already refers.
if (!isa<CXXRecordDecl>(CurContext))
return;
// C++0x [dcl.typedef]p4:
// In a given class scope, a typedef specifier can be used to redefine
// any class-name declared in that scope that is not also a typedef-name
// to refer to the type to which it already refers.
//
// This wording came in via DR424, which was a correction to the
// wording in DR56, which accidentally banned code like:
//
// struct S {
// typedef struct A { } A;
// };
//
// in the C++03 standard. We implement the C++0x semantics, which
// allow the above but disallow
//
// struct S {
// typedef int I;
// typedef int I;
// };
//
// since that was the intent of DR56.
if (!isa<TypedefDecl >(Old))
return;
Diag(New->getLocation(), diag::err_redefinition)
<< New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
// If we have a redefinition of a typedef in C, emit a warning. This warning
// is normally mapped to an error, but can be controlled with
// -Wtypedef-redefinition. If either the original or the redefinition is
// in a system header, don't emit this for compatibility with GCC.
if (getDiagnostics().getSuppressSystemWarnings() &&
(Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
Context.getSourceManager().isInSystemHeader(New->getLocation())))
return;
Diag(New->getLocation(), diag::warn_redefinition_of_typedef)
<< New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return;
}
/// DeclhasAttr - returns true if decl Declaration already has the target
/// attribute.
static bool
DeclHasAttr(const Decl *decl, const Attr *target) {
for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext())
if (attr->getKind() == target->getKind())
return true;
return false;
}
/// MergeAttributes - append attributes from the Old decl to the New one.
static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) {
for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) {
if (!DeclHasAttr(New, attr) && attr->isMerged()) {
Attr *NewAttr = attr->clone(C);
NewAttr->setInherited(true);
New->addAttr(NewAttr);
}
}
}
/// Used in MergeFunctionDecl to keep track of function parameters in
/// C.
struct GNUCompatibleParamWarning {
ParmVarDecl *OldParm;
ParmVarDecl *NewParm;
QualType PromotedType;
};
/// getSpecialMember - get the special member enum for a method.
static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx,
const CXXMethodDecl *MD) {
if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
if (Ctor->isDefaultConstructor())
return Sema::CXXDefaultConstructor;
if (Ctor->isCopyConstructor())
return Sema::CXXCopyConstructor;
}
if (isa<CXXDestructorDecl>(MD))
return Sema::CXXDestructor;
assert(MD->isCopyAssignment() && "Must have copy assignment operator");
return Sema::CXXCopyAssignment;
}
/// canREdefineFunction - checks if a function can be redefined. Currently,
/// only extern inline functions can be redefined, and even then only in
/// GNU89 mode.
static bool canRedefineFunction(const FunctionDecl *FD,
const LangOptions& LangOpts) {
return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus &&
FD->isInlineSpecified() &&
FD->getStorageClass() == FunctionDecl::Extern);
}
/// MergeFunctionDecl - We just parsed a function 'New' from
/// declarator D which has the same name and scope as a previous
/// declaration 'Old'. Figure out how to resolve this situation,
/// merging decls or emitting diagnostics as appropriate.
///
/// In C++, New and Old must be declarations that are not
/// overloaded. Use IsOverload to determine whether New and Old are
/// overloaded, and to select the Old declaration that New should be
/// merged with.
///
/// Returns true if there was an error, false otherwise.
bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) {
// Verify the old decl was also a function.
FunctionDecl *Old = 0;
if (FunctionTemplateDecl *OldFunctionTemplate
= dyn_cast<FunctionTemplateDecl>(OldD))
Old = OldFunctionTemplate->getTemplatedDecl();
else
Old = dyn_cast<FunctionDecl>(OldD);
if (!Old) {
if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
Diag(Shadow->getTargetDecl()->getLocation(),
diag::note_using_decl_target);
Diag(Shadow->getUsingDecl()->getLocation(),
diag::note_using_decl) << 0;
return true;
}
Diag(New->getLocation(), diag::err_redefinition_different_kind)
<< New->getDeclName();
Diag(OldD->getLocation(), diag::note_previous_definition);
return true;
}
// Determine whether the previous declaration was a definition,
// implicit declaration, or a declaration.
diag::kind PrevDiag;
if (Old->isThisDeclarationADefinition())
PrevDiag = diag::note_previous_definition;
else if (Old->isImplicit())
PrevDiag = diag::note_previous_implicit_declaration;
else
PrevDiag = diag::note_previous_declaration;
QualType OldQType = Context.getCanonicalType(Old->getType());
QualType NewQType = Context.getCanonicalType(New->getType());
// Don't complain about this if we're in GNU89 mode and the old function
// is an extern inline function.
if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
New->getStorageClass() == FunctionDecl::Static &&
Old->getStorageClass() != FunctionDecl::Static &&
!canRedefineFunction(Old, getLangOptions())) {
Diag(New->getLocation(), diag::err_static_non_static)
<< New;
Diag(Old->getLocation(), PrevDiag);
return true;
}
// If a function is first declared with a calling convention, but is
// later declared or defined without one, the second decl assumes the
// calling convention of the first.
//
// For the new decl, we have to look at the NON-canonical type to tell the
// difference between a function that really doesn't have a calling
// convention and one that is declared cdecl. That's because in
// canonicalization (see ASTContext.cpp), cdecl is canonicalized away
// because it is the default calling convention.
//
// Note also that we DO NOT return at this point, because we still have
// other tests to run.
const FunctionType *OldType = OldQType->getAs<FunctionType>();
const FunctionType *NewType = New->getType()->getAs<FunctionType>();
const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
if (OldTypeInfo.getCC() != CC_Default &&
NewTypeInfo.getCC() == CC_Default) {
NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC());
New->setType(NewQType);
NewQType = Context.getCanonicalType(NewQType);
} else if (!Context.isSameCallConv(OldTypeInfo.getCC(),
NewTypeInfo.getCC())) {
// Calling conventions really aren't compatible, so complain.
Diag(New->getLocation(), diag::err_cconv_change)
<< FunctionType::getNameForCallConv(NewTypeInfo.getCC())
<< (OldTypeInfo.getCC() == CC_Default)
<< (OldTypeInfo.getCC() == CC_Default ? "" :
FunctionType::getNameForCallConv(OldTypeInfo.getCC()));
Diag(Old->getLocation(), diag::note_previous_declaration);
return true;
}
// FIXME: diagnose the other way around?
if (OldType->getNoReturnAttr() &&
!NewType->getNoReturnAttr()) {
NewQType = Context.getNoReturnType(NewQType);
New->setType(NewQType);
assert(NewQType.isCanonical());
}
if (getLangOptions().CPlusPlus) {
// (C++98 13.1p2):
// Certain function declarations cannot be overloaded:
// -- Function declarations that differ only in the return type
// cannot be overloaded.
QualType OldReturnType
= cast<FunctionType>(OldQType.getTypePtr())->getResultType();
QualType NewReturnType
= cast<FunctionType>(NewQType.getTypePtr())->getResultType();
if (OldReturnType != NewReturnType) {
Diag(New->getLocation(), diag::err_ovl_diff_return_type);
Implicitly declare certain C library functions (malloc, strcpy, memmove, etc.) when we perform name lookup on them. This ensures that we produce the correct signature for these functions, which has two practical impacts: 1) When we're supporting the "implicit function declaration" feature of C99, these functions will be implicitly declared with the right signature rather than as a function returning "int" with no prototype. See PR3541 for the reason why this is important (hint: GCC always predeclares these functions). 2) If users attempt to redeclare one of these library functions with an incompatible signature, we produce a hard error. This patch does a little bit of work to give reasonable error messages. For example, when we hit case #1 we complain that we're implicitly declaring this function with a specific signature, and then we give a note that asks the user to include the appropriate header (e.g., "please include <stdlib.h> or explicitly declare 'malloc'"). In case #2, we show the type of the implicit builtin that was incorrectly declared, so the user can see the problem. We could do better here: for example, when displaying this latter error message we say something like: 'strcpy' was implicitly declared here with type 'char *(char *, char const *)' but we should really print out a fake code line showing the declaration, like this: 'strcpy' was implicitly declared here as: char *strcpy(char *, char const *) This would also be good for printing built-in candidates with C++ operator overloading. The set of C library functions supported by this patch includes all functions from the C99 specification's <stdlib.h> and <string.h> that (a) are predefined by GCC and (b) have signatures that could cause codegen issues if they are treated as functions with no prototype returning and int. Future work could extend this set of functions to other C library functions that we know about. llvm-svn: 64504
2009-02-14 07:20:09 +08:00
Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
return true;
}
const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old);
const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New);
if (OldMethod && NewMethod) {
if (!NewMethod->getFriendObjectKind() &&
NewMethod->getLexicalDeclContext()->isRecord()) {
// -- Member function declarations with the same name and the
// same parameter types cannot be overloaded if any of them
// is a static member function declaration.
if (OldMethod->isStatic() || NewMethod->isStatic()) {
Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
return true;
}
// C++ [class.mem]p1:
// [...] A member shall not be declared twice in the
// member-specification, except that a nested class or member
// class template can be declared and then later defined.
unsigned NewDiag;
if (isa<CXXConstructorDecl>(OldMethod))
NewDiag = diag::err_constructor_redeclared;
else if (isa<CXXDestructorDecl>(NewMethod))
NewDiag = diag::err_destructor_redeclared;
else if (isa<CXXConversionDecl>(NewMethod))
NewDiag = diag::err_conv_function_redeclared;
else
NewDiag = diag::err_member_redeclared;
Diag(New->getLocation(), NewDiag);
Implicitly declare certain C library functions (malloc, strcpy, memmove, etc.) when we perform name lookup on them. This ensures that we produce the correct signature for these functions, which has two practical impacts: 1) When we're supporting the "implicit function declaration" feature of C99, these functions will be implicitly declared with the right signature rather than as a function returning "int" with no prototype. See PR3541 for the reason why this is important (hint: GCC always predeclares these functions). 2) If users attempt to redeclare one of these library functions with an incompatible signature, we produce a hard error. This patch does a little bit of work to give reasonable error messages. For example, when we hit case #1 we complain that we're implicitly declaring this function with a specific signature, and then we give a note that asks the user to include the appropriate header (e.g., "please include <stdlib.h> or explicitly declare 'malloc'"). In case #2, we show the type of the implicit builtin that was incorrectly declared, so the user can see the problem. We could do better here: for example, when displaying this latter error message we say something like: 'strcpy' was implicitly declared here with type 'char *(char *, char const *)' but we should really print out a fake code line showing the declaration, like this: 'strcpy' was implicitly declared here as: char *strcpy(char *, char const *) This would also be good for printing built-in candidates with C++ operator overloading. The set of C library functions supported by this patch includes all functions from the C99 specification's <stdlib.h> and <string.h> that (a) are predefined by GCC and (b) have signatures that could cause codegen issues if they are treated as functions with no prototype returning and int. Future work could extend this set of functions to other C library functions that we know about. llvm-svn: 64504
2009-02-14 07:20:09 +08:00
Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
} else {
if (OldMethod->isImplicit()) {
Diag(NewMethod->getLocation(),
diag::err_definition_of_implicitly_declared_member)
<< New << getSpecialMember(Context, OldMethod);
Diag(OldMethod->getLocation(),
diag::note_previous_implicit_declaration);
return true;
}
}
}
// (C++98 8.3.5p3):
// All declarations for a function shall agree exactly in both the
// return type and the parameter-type-list.
// attributes should be ignored when comparing.
if (Context.getNoReturnType(OldQType, false) ==
Context.getNoReturnType(NewQType, false))
return MergeCompatibleFunctionDecls(New, Old);
// Fall through for conflicting redeclarations and redefinitions.
}
// C: Function types need to be compatible, not identical. This handles
// duplicate function decls like "void f(int); void f(enum X);" properly.
if (!getLangOptions().CPlusPlus &&
Context.typesAreCompatible(OldQType, NewQType)) {
const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
const FunctionProtoType *OldProto = 0;
if (isa<FunctionNoProtoType>(NewFuncType) &&
(OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
// The old declaration provided a function prototype, but the
// new declaration does not. Merge in the prototype.
assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(),
OldProto->arg_type_end());
NewQType = Context.getFunctionType(NewFuncType->getResultType(),
ParamTypes.data(), ParamTypes.size(),
OldProto->isVariadic(),
OldProto->getTypeQuals(),
false, false, 0, 0,
OldProto->getExtInfo());
New->setType(NewQType);
New->setHasInheritedPrototype();
// Synthesize a parameter for each argument type.
llvm::SmallVector<ParmVarDecl*, 16> Params;
for (FunctionProtoType::arg_type_iterator
ParamType = OldProto->arg_type_begin(),
ParamEnd = OldProto->arg_type_end();
ParamType != ParamEnd; ++ParamType) {
ParmVarDecl *Param = ParmVarDecl::Create(Context, New,
SourceLocation(), 0,
*ParamType, /*TInfo=*/0,
VarDecl::None, 0);
Param->setImplicit();
Params.push_back(Param);
}
New->setParams(Params.data(), Params.size());
}
return MergeCompatibleFunctionDecls(New, Old);
}
// GNU C permits a K&R definition to follow a prototype declaration
// if the declared types of the parameters in the K&R definition
// match the types in the prototype declaration, even when the
// promoted types of the parameters from the K&R definition differ
// from the types in the prototype. GCC then keeps the types from
// the prototype.
//
// If a variadic prototype is followed by a non-variadic K&R definition,
// the K&R definition becomes variadic. This is sort of an edge case, but
// it's legal per the standard depending on how you read C99 6.7.5.3p15 and
// C99 6.9.1p8.
if (!getLangOptions().CPlusPlus &&
Old->hasPrototype() && !New->hasPrototype() &&
New->getType()->getAs<FunctionProtoType>() &&
Old->getNumParams() == New->getNumParams()) {
llvm::SmallVector<QualType, 16> ArgTypes;
llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings;
const FunctionProtoType *OldProto
= Old->getType()->getAs<FunctionProtoType>();
const FunctionProtoType *NewProto
= New->getType()->getAs<FunctionProtoType>();
// Determine whether this is the GNU C extension.
QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(),
NewProto->getResultType());
bool LooseCompatible = !MergedReturn.isNull();
for (unsigned Idx = 0, End = Old->getNumParams();
LooseCompatible && Idx != End; ++Idx) {
ParmVarDecl *OldParm = Old->getParamDecl(Idx);
ParmVarDecl *NewParm = New->getParamDecl(Idx);
if (Context.typesAreCompatible(OldParm->getType(),
NewProto->getArgType(Idx))) {
ArgTypes.push_back(NewParm->getType());
} else if (Context.typesAreCompatible(OldParm->getType(),
NewParm->getType())) {
GNUCompatibleParamWarning Warn
= { OldParm, NewParm, NewProto->getArgType(Idx) };
Warnings.push_back(Warn);
ArgTypes.push_back(NewParm->getType());
} else
LooseCompatible = false;
}
if (LooseCompatible) {
for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
Diag(Warnings[Warn].NewParm->getLocation(),
diag::ext_param_promoted_not_compatible_with_prototype)
<< Warnings[Warn].PromotedType
<< Warnings[Warn].OldParm->getType();
Diag(Warnings[Warn].OldParm->getLocation(),
diag::note_previous_declaration);
}
New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0],
ArgTypes.size(),
OldProto->isVariadic(), 0,
false, false, 0, 0,
OldProto->getExtInfo()));
return MergeCompatibleFunctionDecls(New, Old);
}
// Fall through to diagnose conflicting types.
}
// A function that has already been declared has been redeclared or defined
// with a different type- show appropriate diagnostic
if (unsigned BuiltinID = Old->getBuiltinID()) {
// The user has declared a builtin function with an incompatible
// signature.
if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
// The function the user is redeclaring is a library-defined
// function like 'malloc' or 'printf'. Warn about the
// redeclaration, then pretend that we don't know about this
// library built-in.
Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
Diag(Old->getLocation(), diag::note_previous_builtin_declaration)
<< Old << Old->getType();
New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin);
Old->setInvalidDecl();
return false;
}
PrevDiag = diag::note_previous_builtin_declaration;
}
Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
Implicitly declare certain C library functions (malloc, strcpy, memmove, etc.) when we perform name lookup on them. This ensures that we produce the correct signature for these functions, which has two practical impacts: 1) When we're supporting the "implicit function declaration" feature of C99, these functions will be implicitly declared with the right signature rather than as a function returning "int" with no prototype. See PR3541 for the reason why this is important (hint: GCC always predeclares these functions). 2) If users attempt to redeclare one of these library functions with an incompatible signature, we produce a hard error. This patch does a little bit of work to give reasonable error messages. For example, when we hit case #1 we complain that we're implicitly declaring this function with a specific signature, and then we give a note that asks the user to include the appropriate header (e.g., "please include <stdlib.h> or explicitly declare 'malloc'"). In case #2, we show the type of the implicit builtin that was incorrectly declared, so the user can see the problem. We could do better here: for example, when displaying this latter error message we say something like: 'strcpy' was implicitly declared here with type 'char *(char *, char const *)' but we should really print out a fake code line showing the declaration, like this: 'strcpy' was implicitly declared here as: char *strcpy(char *, char const *) This would also be good for printing built-in candidates with C++ operator overloading. The set of C library functions supported by this patch includes all functions from the C99 specification's <stdlib.h> and <string.h> that (a) are predefined by GCC and (b) have signatures that could cause codegen issues if they are treated as functions with no prototype returning and int. Future work could extend this set of functions to other C library functions that we know about. llvm-svn: 64504
2009-02-14 07:20:09 +08:00
Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
return true;
}
/// \brief Completes the merge of two function declarations that are
/// known to be compatible.
///
/// This routine handles the merging of attributes and other
/// properties of function declarations form the old declaration to
/// the new declaration, once we know that New is in fact a
/// redeclaration of Old.
///
/// \returns false
bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) {
// Merge the attributes
MergeAttributes(New, Old, Context);
// Merge the storage class.
if (Old->getStorageClass() != FunctionDecl::Extern &&
Old->getStorageClass() != FunctionDecl::None)
New->setStorageClass(Old->getStorageClass());
// Merge "pure" flag.
if (Old->isPure())
New->setPure();
// Merge the "deleted" flag.
if (Old->isDeleted())
New->setDeleted();
if (getLangOptions().CPlusPlus)
return MergeCXXFunctionDecl(New, Old);
return false;
}
/// MergeVarDecl - We just parsed a variable 'New' which has the same name
/// and scope as a previous declaration 'Old'. Figure out how to resolve this
/// situation, merging decls or emitting diagnostics as appropriate.
///
/// Tentative definition rules (C99 6.9.2p2) are checked by
/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
/// definitions here, since the initializer hasn't been attached.
///
void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
// If the new decl is already invalid, don't do any other checking.
if (New->isInvalidDecl())
return;
// Verify the old decl was also a variable.
VarDecl *Old = 0;
if (!Previous.isSingleResult() ||
!(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) {
Diag(New->getLocation(), diag::err_redefinition_different_kind)
<< New->getDeclName();
Diag(Previous.getRepresentativeDecl()->getLocation(),
diag::note_previous_definition);
return New->setInvalidDecl();
}
MergeAttributes(New, Old, Context);
// Merge the types
QualType MergedT;
if (getLangOptions().CPlusPlus) {
if (Context.hasSameType(New->getType(), Old->getType()))
MergedT = New->getType();
// C++ [basic.link]p10:
// [...] the types specified by all declarations referring to a given
// object or function shall be identical, except that declarations for an
// array object can specify array types that differ by the presence or
// absence of a major array bound (8.3.4).
else if (Old->getType()->isIncompleteArrayType() &&
2009-09-09 14:04:29 +08:00
New->getType()->isArrayType()) {
CanQual<ArrayType> OldArray
2009-09-09 14:04:29 +08:00
= Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
CanQual<ArrayType> NewArray
2009-09-09 14:04:29 +08:00
= Context.getCanonicalType(New->getType())->getAs<ArrayType>();
if (OldArray->getElementType() == NewArray->getElementType())
MergedT = New->getType();
} else if (Old->getType()->isArrayType() &&
New->getType()->isIncompleteArrayType()) {
CanQual<ArrayType> OldArray
= Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
CanQual<ArrayType> NewArray
= Context.getCanonicalType(New->getType())->getAs<ArrayType>();
if (OldArray->getElementType() == NewArray->getElementType())
MergedT = Old->getType();
2009-09-09 14:04:29 +08:00
}
} else {
MergedT = Context.mergeTypes(New->getType(), Old->getType());
}
if (MergedT.isNull()) {
Diag(New->getLocation(), diag::err_redefinition_different_type)
<< New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
New->setType(MergedT);
// C99 6.2.2p4: Check if we have a static decl followed by a non-static.
if (New->getStorageClass() == VarDecl::Static &&
(Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) {
Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
// C99 6.2.2p4:
// For an identifier declared with the storage-class specifier
// extern in a scope in which a prior declaration of that
// identifier is visible,23) if the prior declaration specifies
// internal or external linkage, the linkage of the identifier at
// the later declaration is the same as the linkage specified at
// the prior declaration. If no prior declaration is visible, or
// if the prior declaration specifies no linkage, then the
// identifier has external linkage.
if (New->hasExternalStorage() && Old->hasLinkage())
/* Okay */;
else if (New->getStorageClass() != VarDecl::Static &&
Old->getStorageClass() == VarDecl::Static) {
Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
// Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
// FIXME: The test for external storage here seems wrong? We still
// need to check for mismatches.
if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
// Don't complain about out-of-line definitions of static members.
!(Old->getLexicalDeclContext()->isRecord() &&
!New->getLexicalDeclContext()->isRecord())) {
Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
if (New->isThreadSpecified() && !Old->isThreadSpecified()) {
Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
} else if (!New->isThreadSpecified() && Old->isThreadSpecified()) {
Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
}
// C++ doesn't have tentative definitions, so go right ahead and check here.
const VarDecl *Def;
if (getLangOptions().CPlusPlus &&
New->isThisDeclarationADefinition() == VarDecl::Definition &&
(Def = Old->getDefinition())) {
Diag(New->getLocation(), diag::err_redefinition)
<< New->getDeclName();
Diag(Def->getLocation(), diag::note_previous_definition);
New->setInvalidDecl();
return;
}
// Keep a chain of previous declarations.
New->setPreviousDeclaration(Old);
// Inherit access appropriately.
New->setAccess(Old->getAccess());
}
/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
/// no declarator (e.g. "struct foo;") is parsed.
Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) {
// FIXME: Error on auto/register at file scope
// FIXME: Error on inline/virtual/explicit
// FIXME: Warn on useless __thread
// FIXME: Warn on useless const/volatile
// FIXME: Warn on useless static/extern/typedef/private_extern/mutable
// FIXME: Warn on useless attributes
Decl *TagD = 0;
TagDecl *Tag = 0;
if (DS.getTypeSpecType() == DeclSpec::TST_class ||
DS.getTypeSpecType() == DeclSpec::TST_struct ||
DS.getTypeSpecType() == DeclSpec::TST_union ||
DS.getTypeSpecType() == DeclSpec::TST_enum) {
TagD = static_cast<Decl *>(DS.getTypeRep());
if (!TagD) // We probably had an error
return DeclPtrTy();
// Note that the above type specs guarantee that the
// type rep is a Decl, whereas in many of the others
// it's a Type.
Tag = dyn_cast<TagDecl>(TagD);
}
if (unsigned TypeQuals = DS.getTypeQualifiers()) {
// Enforce C99 6.7.3p2: "Types other than pointer types derived from object
// or incomplete types shall not be restrict-qualified."
if (TypeQuals & DeclSpec::TQ_restrict)
Diag(DS.getRestrictSpecLoc(),
diag::err_typecheck_invalid_restrict_not_pointer_noarg)
<< DS.getSourceRange();
}
if (DS.isFriendSpecified()) {
// If we're dealing with a class template decl, assume that the
// template routines are handling it.
if (TagD && isa<ClassTemplateDecl>(TagD))
return DeclPtrTy();
return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0));
}
if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
// If there are attributes in the DeclSpec, apply them to the record.
if (const AttributeList *AL = DS.getAttributes())
ProcessDeclAttributeList(S, Record, AL);
if (!Record->getDeclName() && Record->isDefinition() &&
DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
if (getLangOptions().CPlusPlus ||
Record->getDeclContext()->isRecord())
return BuildAnonymousStructOrUnion(S, DS, Record);
Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
<< DS.getSourceRange();
}
// Microsoft allows unnamed struct/union fields. Don't complain
// about them.
// FIXME: Should we support Microsoft's extensions in this area?
if (Record->getDeclName() && getLangOptions().Microsoft)
return DeclPtrTy::make(Tag);
}
if (!DS.isMissingDeclaratorOk() &&
DS.getTypeSpecType() != DeclSpec::TST_error) {
// Warn about typedefs of enums without names, since this is an
// extension in both Microsoft an GNU.
if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef &&
Tag && isa<EnumDecl>(Tag)) {
Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name)
<< DS.getSourceRange();
return DeclPtrTy::make(Tag);
}
Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
<< DS.getSourceRange();
}
return DeclPtrTy::make(Tag);
}
/// We are trying to inject an anonymous member into the given scope;
/// check if there's an existing declaration that can't be overloaded.
///
/// \return true if this is a forbidden redeclaration
static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
Scope *S,
DeclContext *Owner,
DeclarationName Name,
SourceLocation NameLoc,
unsigned diagnostic) {
LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
Sema::ForRedeclaration);
if (!SemaRef.LookupName(R, S)) return false;
if (R.getAsSingle<TagDecl>())
return false;
// Pick a representative declaration.
NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
if (PrevDecl && Owner->isRecord()) {
RecordDecl *Record = cast<RecordDecl>(Owner);
if (!SemaRef.isDeclInScope(PrevDecl, Record, S))
return false;
}
SemaRef.Diag(NameLoc, diagnostic) << Name;
SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
return true;
}
/// InjectAnonymousStructOrUnionMembers - Inject the members of the
/// anonymous struct or union AnonRecord into the owning context Owner
/// and scope S. This routine will be invoked just after we realize
/// that an unnamed union or struct is actually an anonymous union or
/// struct, e.g.,
///
/// @code
/// union {
/// int i;
/// float f;
/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
/// // f into the surrounding scope.x
/// @endcode
///
/// This routine is recursive, injecting the names of nested anonymous
/// structs/unions into the owning context and scope as well.
bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner,
RecordDecl *AnonRecord) {
unsigned diagKind
= AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl
: diag::err_anonymous_struct_member_redecl;
bool Invalid = false;
for (RecordDecl::field_iterator F = AnonRecord->field_begin(),
FEnd = AnonRecord->field_end();
F != FEnd; ++F) {
if ((*F)->getDeclName()) {
if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(),
(*F)->getLocation(), diagKind)) {
// C++ [class.union]p2:
// The names of the members of an anonymous union shall be
// distinct from the names of any other entity in the
// scope in which the anonymous union is declared.
Invalid = true;
} else {
// C++ [class.union]p2:
// For the purpose of name lookup, after the anonymous union
// definition, the members of the anonymous union are
// considered to have been defined in the scope in which the
// anonymous union is declared.
Owner->makeDeclVisibleInContext(*F);
S->AddDecl(DeclPtrTy::make(*F));
IdResolver.AddDecl(*F);
}
} else if (const RecordType *InnerRecordType
= (*F)->getType()->getAs<RecordType>()) {
RecordDecl *InnerRecord = InnerRecordType->getDecl();
if (InnerRecord->isAnonymousStructOrUnion())
Invalid = Invalid ||
InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord);
}
}
return Invalid;
}
/// ActOnAnonymousStructOrUnion - Handle the declaration of an
/// anonymous structure or union. Anonymous unions are a C++ feature
/// (C++ [class.union]) and a GNU C extension; anonymous structures
/// are a GNU C and GNU C++ extension.
Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
RecordDecl *Record) {
DeclContext *Owner = Record->getDeclContext();
// Diagnose whether this anonymous struct/union is an extension.
if (Record->isUnion() && !getLangOptions().CPlusPlus)
Diag(Record->getLocation(), diag::ext_anonymous_union);
else if (!Record->isUnion())
Diag(Record->getLocation(), diag::ext_anonymous_struct);
// C and C++ require different kinds of checks for anonymous
// structs/unions.
bool Invalid = false;
if (getLangOptions().CPlusPlus) {
const char* PrevSpec = 0;
unsigned DiagID;
// C++ [class.union]p3:
// Anonymous unions declared in a named namespace or in the
// global namespace shall be declared static.
if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
(isa<TranslationUnitDecl>(Owner) ||
(isa<NamespaceDecl>(Owner) &&
cast<NamespaceDecl>(Owner)->getDeclName()))) {
Diag(Record->getLocation(), diag::err_anonymous_union_not_static);
Invalid = true;
// Recover by adding 'static'.
DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(),
PrevSpec, DiagID);
}
// C++ [class.union]p3:
// A storage class is not allowed in a declaration of an
// anonymous union in a class scope.
else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
isa<RecordDecl>(Owner)) {
Diag(DS.getStorageClassSpecLoc(),
diag::err_anonymous_union_with_storage_spec);
Invalid = true;
// Recover by removing the storage specifier.
DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(),
PrevSpec, DiagID);
}
// C++ [class.union]p2:
// The member-specification of an anonymous union shall only
// define non-static data members. [Note: nested types and
// functions cannot be declared within an anonymous union. ]
for (DeclContext::decl_iterator Mem = Record->decls_begin(),
MemEnd = Record->decls_end();
Mem != MemEnd; ++Mem) {
if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) {
// C++ [class.union]p3:
// An anonymous union shall not have private or protected
// members (clause 11).
if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) {
Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
<< (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected);
Invalid = true;
}
} else if ((*Mem)->isImplicit()) {
// Any implicit members are fine.
} else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) {
// This is a type that showed up in an
// elaborated-type-specifier inside the anonymous struct or
// union, but which actually declares a type outside of the
// anonymous struct or union. It's okay.
} else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) {
if (!MemRecord->isAnonymousStructOrUnion() &&
MemRecord->getDeclName()) {
// This is a nested type declaration.
Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
<< (int)Record->isUnion();
Invalid = true;
}
} else {
// We have something that isn't a non-static data
// member. Complain about it.
unsigned DK = diag::err_anonymous_record_bad_member;
if (isa<TypeDecl>(*Mem))
DK = diag::err_anonymous_record_with_type;
else if (isa<FunctionDecl>(*Mem))
DK = diag::err_anonymous_record_with_function;
else if (isa<VarDecl>(*Mem))
DK = diag::err_anonymous_record_with_static;
Diag((*Mem)->getLocation(), DK)
<< (int)Record->isUnion();
Invalid = true;
}
}
}
if (!Record->isUnion() && !Owner->isRecord()) {
Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
<< (int)getLangOptions().CPlusPlus;
Invalid = true;
}
// Mock up a declarator.
Declarator Dc(DS, Declarator::TypeNameContext);
TypeSourceInfo *TInfo = 0;
GetTypeForDeclarator(Dc, S, &TInfo);
assert(TInfo && "couldn't build declarator info for anonymous struct/union");
// Create a declaration for this anonymous struct/union.
NamedDecl *Anon = 0;
if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(),
/*IdentifierInfo=*/0,
Context.getTypeDeclType(Record),
TInfo,
/*BitWidth=*/0, /*Mutable=*/false);
Anon->setAccess(AS_public);
if (getLangOptions().CPlusPlus)
FieldCollector->Add(cast<FieldDecl>(Anon));
} else {
VarDecl::StorageClass SC;
switch (DS.getStorageClassSpec()) {
default: assert(0 && "Unknown storage class!");
case DeclSpec::SCS_unspecified: SC = VarDecl::None; break;
case DeclSpec::SCS_extern: SC = VarDecl::Extern; break;
case DeclSpec::SCS_static: SC = VarDecl::Static; break;
case DeclSpec::SCS_auto: SC = VarDecl::Auto; break;
case DeclSpec::SCS_register: SC = VarDecl::Register; break;
case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break;
case DeclSpec::SCS_mutable:
// mutable can only appear on non-static class members, so it's always
// an error here
Diag(Record->getLocation(), diag::err_mutable_nonmember);
Invalid = true;
SC = VarDecl::None;
break;
}
Anon = VarDecl::Create(Context, Owner, Record->getLocation(),
/*IdentifierInfo=*/0,
Context.getTypeDeclType(Record),
TInfo,
SC);
}
Anon->setImplicit();
// Add the anonymous struct/union object to the current
// context. We'll be referencing this object when we refer to one of
// its members.
Owner->addDecl(Anon);
// Inject the members of the anonymous struct/union into the owning
// context and into the identifier resolver chain for name lookup
// purposes.
if (InjectAnonymousStructOrUnionMembers(S, Owner, Record))
Invalid = true;
// Mark this as an anonymous struct/union type. Note that we do not
// do this until after we have already checked and injected the
// members of this anonymous struct/union type, because otherwise
// the members could be injected twice: once by DeclContext when it
// builds its lookup table, and once by
// InjectAnonymousStructOrUnionMembers.
Record->setAnonymousStructOrUnion(true);
if (Invalid)
Anon->setInvalidDecl();
return DeclPtrTy::make(Anon);
}
/// GetNameForDeclarator - Determine the full declaration name for the
/// given Declarator.
DeclarationName Sema::GetNameForDeclarator(Declarator &D) {
return GetNameFromUnqualifiedId(D.getName());
}
/// \brief Retrieves the canonicalized name from a parsed unqualified-id.
DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
switch (Name.getKind()) {
case UnqualifiedId::IK_Identifier:
return DeclarationName(Name.Identifier);
case UnqualifiedId::IK_OperatorFunctionId:
return Context.DeclarationNames.getCXXOperatorName(
2009-11-29 11:04:53 +08:00
Name.OperatorFunctionId.Operator);
case UnqualifiedId::IK_LiteralOperatorId:
return Context.DeclarationNames.getCXXLiteralOperatorName(
Name.Identifier);
case UnqualifiedId::IK_ConversionFunctionId: {
QualType Ty = GetTypeFromParser(Name.ConversionFunctionId);
if (Ty.isNull())
return DeclarationName();
return Context.DeclarationNames.getCXXConversionFunctionName(
2009-11-29 11:04:53 +08:00
Context.getCanonicalType(Ty));
}
case UnqualifiedId::IK_ConstructorName: {
QualType Ty = GetTypeFromParser(Name.ConstructorName);
if (Ty.isNull())
return DeclarationName();
return Context.DeclarationNames.getCXXConstructorName(
2009-11-29 11:04:53 +08:00
Context.getCanonicalType(Ty));
}
case UnqualifiedId::IK_ConstructorTemplateId: {
// In well-formed code, we can only have a constructor
// template-id that refers to the current context, so go there
// to find the actual type being constructed.
CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
return DeclarationName();
// Determine the type of the class being constructed.
QualType CurClassType = Context.getTypeDeclType(CurClass);
// FIXME: Check two things: that the template-id names the same type as
// CurClassType, and that the template-id does not occur when the name
// was qualified.
return Context.DeclarationNames.getCXXConstructorName(
Context.getCanonicalType(CurClassType));
}
case UnqualifiedId::IK_DestructorName: {
QualType Ty = GetTypeFromParser(Name.DestructorName);
if (Ty.isNull())
return DeclarationName();
return Context.DeclarationNames.getCXXDestructorName(
Context.getCanonicalType(Ty));
}
case UnqualifiedId::IK_TemplateId: {
TemplateName TName
= TemplateName::getFromVoidPointer(Name.TemplateId->Template);
return Context.getNameForTemplate(TName);
}
}
assert(false && "Unknown name kind");
return DeclarationName();
}
/// isNearlyMatchingFunction - Determine whether the C++ functions
/// Declaration and Definition are "nearly" matching. This heuristic
/// is used to improve diagnostics in the case where an out-of-line
/// function definition doesn't match any declaration within
/// the class or namespace.
static bool isNearlyMatchingFunction(ASTContext &Context,
FunctionDecl *Declaration,
FunctionDecl *Definition) {
if (Declaration->param_size() != Definition->param_size())
return false;
for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(),
DefParamTy.getNonReferenceType()))
return false;
}
return true;
}
Sema::DeclPtrTy
Sema::HandleDeclarator(Scope *S, Declarator &D,
MultiTemplateParamsArg TemplateParamLists,
bool IsFunctionDefinition) {
DeclarationName Name = GetNameForDeclarator(D);
// All of these full declarators require an identifier. If it doesn't have
// one, the ParsedFreeStandingDeclSpec action should be used.
if (!Name) {
if (!D.isInvalidType()) // Reject this if we think it is valid.
Diag(D.getDeclSpec().getSourceRange().getBegin(),
diag::err_declarator_need_ident)
<< D.getDeclSpec().getSourceRange() << D.getSourceRange();
return DeclPtrTy();
}
// The scope passed in may not be a decl scope. Zip up the scope tree until
// we find one that is.
while ((S->getFlags() & Scope::DeclScope) == 0 ||
(S->getFlags() & Scope::TemplateParamScope) != 0)
S = S->getParent();
// If this is an out-of-line definition of a member of a class template
// or class template partial specialization, we may need to rebuild the
// type specifier in the declarator. See RebuildTypeInCurrentInstantiation()
// for more information.
// FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can
// handle expressions properly.
DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec());
if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() &&
isDependentScopeSpecifier(D.getCXXScopeSpec()) &&
(DS.getTypeSpecType() == DeclSpec::TST_typename ||
DS.getTypeSpecType() == DeclSpec::TST_typeofType ||
DS.getTypeSpecType() == DeclSpec::TST_typeofExpr ||
DS.getTypeSpecType() == DeclSpec::TST_decltype)) {
if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) {
// FIXME: Preserve type source info.
QualType T = GetTypeFromParser(DS.getTypeRep());
DeclContext *SavedContext = CurContext;
CurContext = DC;
T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name);
CurContext = SavedContext;
if (T.isNull())
return DeclPtrTy();
DS.UpdateTypeRep(T.getAsOpaquePtr());
}
}
DeclContext *DC;
NamedDecl *New;
TypeSourceInfo *TInfo = 0;
QualType R = GetTypeForDeclarator(D, S, &TInfo);
LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName,
ForRedeclaration);
// See if this is a redefinition of a variable in the same scope.
if (D.getCXXScopeSpec().isInvalid()) {
DC = CurContext;
D.setInvalidType();
} else if (!D.getCXXScopeSpec().isSet()) {
bool IsLinkageLookup = false;
// If the declaration we're planning to build will be a function
// or object with linkage, then look for another declaration with
// linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
/* Do nothing*/;
else if (R->isFunctionType()) {
if (CurContext->isFunctionOrMethod() ||
D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
IsLinkageLookup = true;
} else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern)
IsLinkageLookup = true;
else if (CurContext->getLookupContext()->isTranslationUnit() &&
D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
IsLinkageLookup = true;
if (IsLinkageLookup)
Previous.clear(LookupRedeclarationWithLinkage);
DC = CurContext;
LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup);
} else { // Something like "int foo::x;"
DC = computeDeclContext(D.getCXXScopeSpec(), true);
if (!DC) {
// If we could not compute the declaration context, it's because the
// declaration context is dependent but does not refer to a class,
// class template, or class template partial specialization. Complain
// and return early, to avoid the coming semantic disaster.
Diag(D.getIdentifierLoc(),
diag::err_template_qualified_declarator_no_match)
<< (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep()
<< D.getCXXScopeSpec().getRange();
return DeclPtrTy();
}
if (!DC->isDependentContext() &&
RequireCompleteDeclContext(D.getCXXScopeSpec()))
return DeclPtrTy();
if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) {
Diag(D.getIdentifierLoc(),
diag::err_member_def_undefined_record)
<< Name << DC << D.getCXXScopeSpec().getRange();
D.setInvalidType();
}
LookupQualifiedName(Previous, DC);
// Don't consider using declarations as previous declarations for
// out-of-line members.
RemoveUsingDecls(Previous);
// C++ 7.3.1.2p2:
// Members (including explicit specializations of templates) of a named
// namespace can also be defined outside that namespace by explicit
// qualification of the name being defined, provided that the entity being
// defined was already declared in the namespace and the definition appears
// after the point of declaration in a namespace that encloses the
// declarations namespace.
//
// Note that we only check the context at this point. We don't yet
// have enough information to make sure that PrevDecl is actually
// the declaration we want to match. For example, given:
//
// class X {
// void f();
// void f(float);
// };
//
// void X::f(int) { } // ill-formed
//
// In this case, PrevDecl will point to the overload set
// containing the two f's declared in X, but neither of them
// matches.
// First check whether we named the global scope.
if (isa<TranslationUnitDecl>(DC)) {
Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope)
<< Name << D.getCXXScopeSpec().getRange();
} else {
DeclContext *Cur = CurContext;
while (isa<LinkageSpecDecl>(Cur))
Cur = Cur->getParent();
if (!Cur->Encloses(DC)) {
// The qualifying scope doesn't enclose the original declaration.
// Emit diagnostic based on current scope.
SourceLocation L = D.getIdentifierLoc();
SourceRange R = D.getCXXScopeSpec().getRange();
if (isa<FunctionDecl>(Cur))
Diag(L, diag::err_invalid_declarator_in_function) << Name << R;
else
Diag(L, diag::err_invalid_declarator_scope)
<< Name << cast<NamedDecl>(DC) << R;
D.setInvalidType();
}
}
}
if (Previous.isSingleResult() &&
Previous.getFoundDecl()->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
if (!D.isInvalidType())
if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
Previous.getFoundDecl()))
D.setInvalidType();
// Just pretend that we didn't see the previous declaration.
Previous.clear();
}
// In C++, the previous declaration we find might be a tag type
// (class or enum). In this case, the new declaration will hide the
// tag type. Note that this does does not apply if we're declaring a
// typedef (C++ [dcl.typedef]p4).
if (Previous.isSingleTagDecl() &&
D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
Previous.clear();
bool Redeclaration = false;
if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
if (TemplateParamLists.size()) {
Diag(D.getIdentifierLoc(), diag::err_template_typedef);
return DeclPtrTy();
}
New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration);
} else if (R->isFunctionType()) {
New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous,
move(TemplateParamLists),
IsFunctionDefinition, Redeclaration);
} else {
New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous,
move(TemplateParamLists),
Redeclaration);
}
if (New == 0)
return DeclPtrTy();
// If this has an identifier and is not an invalid redeclaration or
// function template specialization, add it to the scope stack.
if (Name && !(Redeclaration && New->isInvalidDecl()))
PushOnScopeChains(New, S);
return DeclPtrTy::make(New);
}
/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array
/// types into constant array types in certain situations which would otherwise
/// be errors (for GCC compatibility).
static QualType TryToFixInvalidVariablyModifiedType(QualType T,
ASTContext &Context,
bool &SizeIsNegative) {
// This method tries to turn a variable array into a constant
// array even when the size isn't an ICE. This is necessary
// for compatibility with code that depends on gcc's buggy
// constant expression folding, like struct {char x[(int)(char*)2];}
SizeIsNegative = false;
QualifierCollector Qs;
const Type *Ty = Qs.strip(T);
if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
QualType Pointee = PTy->getPointeeType();
QualType FixedType =
TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative);
if (FixedType.isNull()) return FixedType;
FixedType = Context.getPointerType(FixedType);
return Qs.apply(FixedType);
}
const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
if (!VLATy)
return QualType();
// FIXME: We should probably handle this case
if (VLATy->getElementType()->isVariablyModifiedType())
return QualType();
Expr::EvalResult EvalResult;
if (!VLATy->getSizeExpr() ||
!VLATy->getSizeExpr()->Evaluate(EvalResult, Context) ||
!EvalResult.Val.isInt())
return QualType();
llvm::APSInt &Res = EvalResult.Val.getInt();
if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) {
// TODO: preserve the size expression in declarator info
return Context.getConstantArrayType(VLATy->getElementType(),
Res, ArrayType::Normal, 0);
}
SizeIsNegative = true;
return QualType();
}
/// \brief Register the given locally-scoped external C declaration so
/// that it can be found later for redeclarations
void
Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND,
const LookupResult &Previous,
Scope *S) {
assert(ND->getLexicalDeclContext()->isFunctionOrMethod() &&
"Decl is not a locally-scoped decl!");
// Note that we have a locally-scoped external with this name.
LocallyScopedExternalDecls[ND->getDeclName()] = ND;
if (!Previous.isSingleResult())
return;
NamedDecl *PrevDecl = Previous.getFoundDecl();
// If there was a previous declaration of this variable, it may be
// in our identifier chain. Update the identifier chain with the new
// declaration.
if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) {
// The previous declaration was found on the identifer resolver
// chain, so remove it from its scope.
while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl)))
S = S->getParent();
if (S)
S->RemoveDecl(DeclPtrTy::make(PrevDecl));
}
}
/// \brief Diagnose function specifiers on a declaration of an identifier that
/// does not identify a function.
void Sema::DiagnoseFunctionSpecifiers(Declarator& D) {
// FIXME: We should probably indicate the identifier in question to avoid
// confusion for constructs like "inline int a(), b;"
if (D.getDeclSpec().isInlineSpecified())
Diag(D.getDeclSpec().getInlineSpecLoc(),
diag::err_inline_non_function);
if (D.getDeclSpec().isVirtualSpecified())
Diag(D.getDeclSpec().getVirtualSpecLoc(),
diag::err_virtual_non_function);
if (D.getDeclSpec().isExplicitSpecified())
Diag(D.getDeclSpec().getExplicitSpecLoc(),
diag::err_explicit_non_function);
}
NamedDecl*
Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
QualType R, TypeSourceInfo *TInfo,
LookupResult &Previous, bool &Redeclaration) {
// Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
if (D.getCXXScopeSpec().isSet()) {
Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
<< D.getCXXScopeSpec().getRange();
D.setInvalidType();
// Pretend we didn't see the scope specifier.
DC = CurContext;
Previous.clear();
}
if (getLangOptions().CPlusPlus) {
// Check that there are no default arguments (C++ only).
CheckExtraCXXDefaultArguments(D);
}
DiagnoseFunctionSpecifiers(D);
if (D.getDeclSpec().isThreadSpecified())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo);
if (!NewTD) return 0;
// Handle attributes prior to checking for duplicates in MergeVarDecl
ProcessDeclAttributes(S, NewTD, D);
// Merge the decl with the existing one if appropriate. If the decl is
// in an outer scope, it isn't the same thing.
FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false);
if (!Previous.empty()) {
Redeclaration = true;
MergeTypeDefDecl(NewTD, Previous);
}
// C99 6.7.7p2: If a typedef name specifies a variably modified type
// then it shall have block scope.
QualType T = NewTD->getUnderlyingType();
if (T->isVariablyModifiedType()) {
FunctionNeedsScopeChecking() = true;
if (S->getFnParent() == 0) {
bool SizeIsNegative;
QualType FixedTy =
TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative);
if (!FixedTy.isNull()) {
Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size);
NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy));
} else {
if (SizeIsNegative)
Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size);
else if (T->isVariableArrayType())
Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope);
else
Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope);
NewTD->setInvalidDecl();
}
}
}
// If this is the C FILE type, notify the AST context.
if (IdentifierInfo *II = NewTD->getIdentifier())
if (!NewTD->isInvalidDecl() &&
NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) {
if (II->isStr("FILE"))
Context.setFILEDecl(NewTD);
else if (II->isStr("jmp_buf"))
Context.setjmp_bufDecl(NewTD);
else if (II->isStr("sigjmp_buf"))
Context.setsigjmp_bufDecl(NewTD);
}
return NewTD;
}
/// \brief Determines whether the given declaration is an out-of-scope
/// previous declaration.
///
/// This routine should be invoked when name lookup has found a
/// previous declaration (PrevDecl) that is not in the scope where a
/// new declaration by the same name is being introduced. If the new
/// declaration occurs in a local scope, previous declarations with
/// linkage may still be considered previous declarations (C99
/// 6.2.2p4-5, C++ [basic.link]p6).
///
/// \param PrevDecl the previous declaration found by name
/// lookup
///
/// \param DC the context in which the new declaration is being
/// declared.
///
/// \returns true if PrevDecl is an out-of-scope previous declaration
/// for a new delcaration with the same name.
static bool
isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
ASTContext &Context) {
if (!PrevDecl)
return 0;
if (!PrevDecl->hasLinkage())
return false;
if (Context.getLangOptions().CPlusPlus) {
// C++ [basic.link]p6:
// If there is a visible declaration of an entity with linkage
// having the same name and type, ignoring entities declared
// outside the innermost enclosing namespace scope, the block
// scope declaration declares that same entity and receives the
// linkage of the previous declaration.
DeclContext *OuterContext = DC->getLookupContext();
if (!OuterContext->isFunctionOrMethod())
// This rule only applies to block-scope declarations.
return false;
else {
DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
if (PrevOuterContext->isRecord())
// We found a member function: ignore it.
return false;
else {
// Find the innermost enclosing namespace for the new and
// previous declarations.
while (!OuterContext->isFileContext())
OuterContext = OuterContext->getParent();
while (!PrevOuterContext->isFileContext())
PrevOuterContext = PrevOuterContext->getParent();
// The previous declaration is in a different namespace, so it
// isn't the same function.
if (OuterContext->getPrimaryContext() !=
PrevOuterContext->getPrimaryContext())
return false;
}
}
}
return true;
}
static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
CXXScopeSpec &SS = D.getCXXScopeSpec();
if (!SS.isSet()) return;
DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()),
SS.getRange());
}
NamedDecl*
Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC,
QualType R, TypeSourceInfo *TInfo,
LookupResult &Previous,
MultiTemplateParamsArg TemplateParamLists,
bool &Redeclaration) {
DeclarationName Name = GetNameForDeclarator(D);
// Check that there are no default arguments (C++ only).
if (getLangOptions().CPlusPlus)
CheckExtraCXXDefaultArguments(D);
VarDecl *NewVD;
VarDecl::StorageClass SC;
switch (D.getDeclSpec().getStorageClassSpec()) {
default: assert(0 && "Unknown storage class!");
case DeclSpec::SCS_unspecified: SC = VarDecl::None; break;
case DeclSpec::SCS_extern: SC = VarDecl::Extern; break;
case DeclSpec::SCS_static: SC = VarDecl::Static; break;
case DeclSpec::SCS_auto: SC = VarDecl::Auto; break;
case DeclSpec::SCS_register: SC = VarDecl::Register; break;
case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break;
case DeclSpec::SCS_mutable:
// mutable can only appear on non-static class members, so it's always
// an error here
Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
D.setInvalidType();
SC = VarDecl::None;
break;
}
IdentifierInfo *II = Name.getAsIdentifierInfo();
if (!II) {
Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
<< Name.getAsString();
return 0;
}
DiagnoseFunctionSpecifiers(D);
if (!DC->isRecord() && S->getFnParent() == 0) {
// C99 6.9p2: The storage-class specifiers auto and register shall not
// appear in the declaration specifiers in an external declaration.
if (SC == VarDecl::Auto || SC == VarDecl::Register) {
// If this is a register variable with an asm label specified, then this
// is a GNU extension.
if (SC == VarDecl::Register && D.getAsmLabel())
Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register);
else
Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
D.setInvalidType();
}
}
if (DC->isRecord() && !CurContext->isRecord()) {
// This is an out-of-line definition of a static data member.
if (SC == VarDecl::Static) {
Diag(D.getDeclSpec().getStorageClassSpecLoc(),
diag::err_static_out_of_line)
<< FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
} else if (SC == VarDecl::None)
SC = VarDecl::Static;
}
if (SC == VarDecl::Static) {
if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
if (RD->isLocalClass())
Diag(D.getIdentifierLoc(),
diag::err_static_data_member_not_allowed_in_local_class)
<< Name << RD->getDeclName();
}
}
// Match up the template parameter lists with the scope specifier, then
// determine whether we have a template or a template specialization.
bool isExplicitSpecialization = false;
if (TemplateParameterList *TemplateParams
= MatchTemplateParametersToScopeSpecifier(
D.getDeclSpec().getSourceRange().getBegin(),
D.getCXXScopeSpec(),
(TemplateParameterList**)TemplateParamLists.get(),
TemplateParamLists.size(),
isExplicitSpecialization)) {
if (TemplateParams->size() > 0) {
// There is no such thing as a variable template.
Diag(D.getIdentifierLoc(), diag::err_template_variable)
<< II
<< SourceRange(TemplateParams->getTemplateLoc(),
TemplateParams->getRAngleLoc());
return 0;
} else {
// There is an extraneous 'template<>' for this variable. Complain
// about it, but allow the declaration of the variable.
Diag(TemplateParams->getTemplateLoc(),
diag::err_template_variable_noparams)
<< II
<< SourceRange(TemplateParams->getTemplateLoc(),
TemplateParams->getRAngleLoc());
isExplicitSpecialization = true;
}
}
NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(),
II, R, TInfo, SC);
if (D.isInvalidType())
NewVD->setInvalidDecl();
SetNestedNameSpecifier(NewVD, D);
if (D.getDeclSpec().isThreadSpecified()) {
if (NewVD->hasLocalStorage())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global);
else if (!Context.Target.isTLSSupported())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported);
else
NewVD->setThreadSpecified(true);
}
// Set the lexical context. If the declarator has a C++ scope specifier, the
// lexical context will be different from the semantic context.
NewVD->setLexicalDeclContext(CurContext);
// Handle attributes prior to checking for duplicates in MergeVarDecl
ProcessDeclAttributes(S, NewVD, D);
// Handle GNU asm-label extension (encoded as an attribute).
if (Expr *E = (Expr*) D.getAsmLabel()) {
// The parser guarantees this is a string.
StringLiteral *SE = cast<StringLiteral>(E);
NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString()));
}
// Diagnose shadowed variables before filtering for scope.
if (!D.getCXXScopeSpec().isSet())
CheckShadow(S, NewVD, Previous);
// Don't consider existing declarations that are in a different
// scope and are out-of-semantic-context declarations (if the new
// declaration has linkage).
FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage());
// Merge the decl with the existing one if appropriate.
if (!Previous.empty()) {
if (Previous.isSingleResult() &&
isa<FieldDecl>(Previous.getFoundDecl()) &&
D.getCXXScopeSpec().isSet()) {
// The user tried to define a non-static data member
// out-of-line (C++ [dcl.meaning]p1).
Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
<< D.getCXXScopeSpec().getRange();
Previous.clear();
NewVD->setInvalidDecl();
}
} else if (D.getCXXScopeSpec().isSet()) {
// No previous declaration in the qualifying scope.
Diag(D.getIdentifierLoc(), diag::err_no_member)
<< Name << computeDeclContext(D.getCXXScopeSpec(), true)
<< D.getCXXScopeSpec().getRange();
NewVD->setInvalidDecl();
}
CheckVariableDeclaration(NewVD, Previous, Redeclaration);
// This is an explicit specialization of a static data member. Check it.
if (isExplicitSpecialization && !NewVD->isInvalidDecl() &&
CheckMemberSpecialization(NewVD, Previous))
NewVD->setInvalidDecl();
// attributes declared post-definition are currently ignored
if (Previous.isSingleResult()) {
VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl());
if (Def && (Def = Def->getDefinition()) &&
Def != NewVD && D.hasAttributes()) {
Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition);
Diag(Def->getLocation(), diag::note_previous_definition);
}
}
// If this is a locally-scoped extern C variable, update the map of
// such variables.
if (CurContext->isFunctionOrMethod() && NewVD->isExternC() &&
!NewVD->isInvalidDecl())
RegisterLocallyScopedExternCDecl(NewVD, Previous, S);
return NewVD;
}
/// \brief Diagnose variable or built-in function shadowing. Implements
/// -Wshadow.
///
/// This method is called whenever a VarDecl is added to a "useful"
/// scope.
///
/// \param S the scope in which the shadowing name is being declared
/// \param R the lookup of the name
///
void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
// Return if warning is ignored.
if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored)
return;
// Don't diagnose declarations at file scope. The scope might not
// have a DeclContext if (e.g.) we're parsing a function prototype.
DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity());
if (NewDC && NewDC->isFileContext())
return;
// Only diagnose if we're shadowing an unambiguous field or variable.
if (R.getResultKind() != LookupResult::Found)
return;
NamedDecl* ShadowedDecl = R.getFoundDecl();
if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
return;
DeclContext *OldDC = ShadowedDecl->getDeclContext();
// Only warn about certain kinds of shadowing for class members.
if (NewDC && NewDC->isRecord()) {
// In particular, don't warn about shadowing non-class members.
if (!OldDC->isRecord())
return;
// TODO: should we warn about static data members shadowing
// static data members from base classes?
// TODO: don't diagnose for inaccessible shadowed members.
// This is hard to do perfectly because we might friend the
// shadowing context, but that's just a false negative.
}
// Determine what kind of declaration we're shadowing.
unsigned Kind;
if (isa<RecordDecl>(OldDC)) {
if (isa<FieldDecl>(ShadowedDecl))
Kind = 3; // field
else
Kind = 2; // static data member
} else if (OldDC->isFileContext())
Kind = 1; // global
else
Kind = 0; // local
DeclarationName Name = R.getLookupName();
// Emit warning and note.
Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
}
/// \brief Check -Wshadow without the advantage of a previous lookup.
void Sema::CheckShadow(Scope *S, VarDecl *D) {
LookupResult R(*this, D->getDeclName(), D->getLocation(),
Sema::LookupOrdinaryName, Sema::ForRedeclaration);
LookupName(R, S);
CheckShadow(S, D, R);
}
/// \brief Perform semantic checking on a newly-created variable
/// declaration.
///
/// This routine performs all of the type-checking required for a
/// variable declaration once it has been built. It is used both to
/// check variables after they have been parsed and their declarators
/// have been translated into a declaration, and to check variables
/// that have been instantiated from a template.
///
/// Sets NewVD->isInvalidDecl() if an error was encountered.
void Sema::CheckVariableDeclaration(VarDecl *NewVD,
LookupResult &Previous,
bool &Redeclaration) {
// If the decl is already known invalid, don't check it.
if (NewVD->isInvalidDecl())
return;
QualType T = NewVD->getType();
if (T->isObjCInterfaceType()) {
Diag(NewVD->getLocation(), diag::err_statically_allocated_object);
return NewVD->setInvalidDecl();
}
// Emit an error if an address space was applied to decl with local storage.
// This includes arrays of objects with address space qualifiers, but not
// automatic variables that point to other address spaces.
// ISO/IEC TR 18037 S5.1.2
if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) {
Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
return NewVD->setInvalidDecl();
}
if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
&& !NewVD->hasAttr<BlocksAttr>())
Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
bool isVM = T->isVariablyModifiedType();
if (isVM || NewVD->hasAttr<CleanupAttr>() ||
NewVD->hasAttr<BlocksAttr>() ||
// FIXME: We need to diagnose jumps passed initialized variables in C++.
// However, this turns on the scope checker for everything with a variable
// which may impact compile time. See if we can find a better solution
// to this, perhaps only checking functions that contain gotos in C++?
(LangOpts.CPlusPlus && NewVD->hasLocalStorage()))
FunctionNeedsScopeChecking() = true;
if ((isVM && NewVD->hasLinkage()) ||
(T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
bool SizeIsNegative;
QualType FixedTy =
TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative);
if (FixedTy.isNull() && T->isVariableArrayType()) {
const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
// FIXME: This won't give the correct result for
// int a[10][n];
SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
if (NewVD->isFileVarDecl())
Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
<< SizeRange;
else if (NewVD->getStorageClass() == VarDecl::Static)
Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
<< SizeRange;
else
Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
<< SizeRange;
return NewVD->setInvalidDecl();
}
if (FixedTy.isNull()) {
if (NewVD->isFileVarDecl())
Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
else
Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
return NewVD->setInvalidDecl();
}
Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
NewVD->setType(FixedTy);
}
if (Previous.empty() && NewVD->isExternC()) {
// Since we did not find anything by this name and we're declaring
// an extern "C" variable, look for a non-visible extern "C"
// declaration with the same name.
llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
= LocallyScopedExternalDecls.find(NewVD->getDeclName());
if (Pos != LocallyScopedExternalDecls.end())
Previous.addDecl(Pos->second);
}
if (T->isVoidType() && !NewVD->hasExternalStorage()) {
Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
<< T;
return NewVD->setInvalidDecl();
}
if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
return NewVD->setInvalidDecl();
}
if (isVM && NewVD->hasAttr<BlocksAttr>()) {
Diag(NewVD->getLocation(), diag::err_block_on_vm);
return NewVD->setInvalidDecl();
}
if (!Previous.empty()) {
Redeclaration = true;
MergeVarDecl(NewVD, Previous);
}
}
/// \brief Data used with FindOverriddenMethod
struct FindOverriddenMethodData {
Sema *S;
CXXMethodDecl *Method;
};
/// \brief Member lookup function that determines whether a given C++
/// method overrides a method in a base class, to be used with
/// CXXRecordDecl::lookupInBases().
static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier,
CXXBasePath &Path,
void *UserData) {
RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
FindOverriddenMethodData *Data
= reinterpret_cast<FindOverriddenMethodData*>(UserData);
DeclarationName Name = Data->Method->getDeclName();
// FIXME: Do we care about other names here too?
if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
// We really want to find the base class constructor here.
QualType T = Data->S->Context.getTypeDeclType(BaseRecord);
CanQualType CT = Data->S->Context.getCanonicalType(T);
2009-11-27 09:26:58 +08:00
Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT);
}
for (Path.Decls = BaseRecord->lookup(Name);
Path.Decls.first != Path.Decls.second;
++Path.Decls.first) {
if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) {
if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD))
return true;
}
}
return false;
}
/// AddOverriddenMethods - See if a method overrides any in the base classes,
/// and if so, check that it's a valid override and remember it.
void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
// Look for virtual methods in base classes that this method might override.
CXXBasePaths Paths;
FindOverriddenMethodData Data;
Data.Method = MD;
Data.S = this;
if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) {
for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(),
E = Paths.found_decls_end(); I != E; ++I) {
if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
!CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
!CheckOverridingFunctionAttributes(MD, OldMD))
MD->addOverriddenMethod(OldMD->getCanonicalDecl());
}
}
}
}
NamedDecl*
Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
QualType R, TypeSourceInfo *TInfo,
LookupResult &Previous,
MultiTemplateParamsArg TemplateParamLists,
bool IsFunctionDefinition, bool &Redeclaration) {
assert(R.getTypePtr()->isFunctionType());
DeclarationName Name = GetNameForDeclarator(D);
FunctionDecl::StorageClass SC = FunctionDecl::None;
switch (D.getDeclSpec().getStorageClassSpec()) {
default: assert(0 && "Unknown storage class!");
case DeclSpec::SCS_auto:
case DeclSpec::SCS_register:
case DeclSpec::SCS_mutable:
Diag(D.getDeclSpec().getStorageClassSpecLoc(),
diag::err_typecheck_sclass_func);
D.setInvalidType();
break;
case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break;
case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break;
case DeclSpec::SCS_static: {
if (CurContext->getLookupContext()->isFunctionOrMethod()) {
// C99 6.7.1p5:
// The declaration of an identifier for a function that has
// block scope shall have no explicit storage-class specifier
// other than extern
// See also (C++ [dcl.stc]p4).
Diag(D.getDeclSpec().getStorageClassSpecLoc(),
diag::err_static_block_func);
SC = FunctionDecl::None;
} else
SC = FunctionDecl::Static;
break;
}
case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break;
}
if (D.getDeclSpec().isThreadSpecified())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
bool isFriend = D.getDeclSpec().isFriendSpecified();
bool isInline = D.getDeclSpec().isInlineSpecified();
bool isVirtual = D.getDeclSpec().isVirtualSpecified();
bool isExplicit = D.getDeclSpec().isExplicitSpecified();
// Check that the return type is not an abstract class type.
// For record types, this is done by the AbstractClassUsageDiagnoser once
// the class has been completely parsed.
if (!DC->isRecord() &&
RequireNonAbstractType(D.getIdentifierLoc(),
R->getAs<FunctionType>()->getResultType(),
diag::err_abstract_type_in_decl,
AbstractReturnType))
D.setInvalidType();
// Do not allow returning a objc interface by-value.
if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) {
Diag(D.getIdentifierLoc(),
diag::err_object_cannot_be_passed_returned_by_value) << 0
<< R->getAs<FunctionType>()->getResultType();
D.setInvalidType();
}
bool isVirtualOkay = false;
FunctionDecl *NewFD;
if (isFriend) {
// C++ [class.friend]p5
// A function can be defined in a friend declaration of a
// class . . . . Such a function is implicitly inline.
isInline |= IsFunctionDefinition;
}
if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
// This is a C++ constructor declaration.
assert(DC->isRecord() &&
"Constructors can only be declared in a member context");
R = CheckConstructorDeclarator(D, R, SC);
// Create the new declaration
NewFD = CXXConstructorDecl::Create(Context,
cast<CXXRecordDecl>(DC),
D.getIdentifierLoc(), Name, R, TInfo,
isExplicit, isInline,
/*isImplicitlyDeclared=*/false);
} else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
// This is a C++ destructor declaration.
if (DC->isRecord()) {
R = CheckDestructorDeclarator(D, SC);
NewFD = CXXDestructorDecl::Create(Context,
cast<CXXRecordDecl>(DC),
D.getIdentifierLoc(), Name, R,
isInline,
/*isImplicitlyDeclared=*/false);
NewFD->setTypeSourceInfo(TInfo);
isVirtualOkay = true;
} else {
Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
// Create a FunctionDecl to satisfy the function definition parsing
// code path.
NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(),
Name, R, TInfo, SC, isInline,
/*hasPrototype=*/true);
D.setInvalidType();
}
} else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
if (!DC->isRecord()) {
Diag(D.getIdentifierLoc(),
diag::err_conv_function_not_member);
return 0;
}
CheckConversionDeclarator(D, R, SC);
NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC),
D.getIdentifierLoc(), Name, R, TInfo,
isInline, isExplicit);
isVirtualOkay = true;
} else if (DC->isRecord()) {
// If the of the function is the same as the name of the record, then this
// must be an invalid constructor that has a return type.
// (The parser checks for a return type and makes the declarator a
// constructor if it has no return type).
// must have an invalid constructor that has a return type
if (Name.getAsIdentifierInfo() &&
Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
<< SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
<< SourceRange(D.getIdentifierLoc());
return 0;
}
bool isStatic = SC == FunctionDecl::Static;
// [class.free]p1:
// Any allocation function for a class T is a static member
// (even if not explicitly declared static).
if (Name.getCXXOverloadedOperator() == OO_New ||
Name.getCXXOverloadedOperator() == OO_Array_New)
isStatic = true;
// [class.free]p6 Any deallocation function for a class X is a static member
// (even if not explicitly declared static).
if (Name.getCXXOverloadedOperator() == OO_Delete ||
Name.getCXXOverloadedOperator() == OO_Array_Delete)
isStatic = true;
// This is a C++ method declaration.
NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC),
D.getIdentifierLoc(), Name, R, TInfo,
isStatic, isInline);
isVirtualOkay = !isStatic;
} else {
// Determine whether the function was written with a
// prototype. This true when:
// - we're in C++ (where every function has a prototype),
// - there is a prototype in the declarator, or
// - the type R of the function is some kind of typedef or other reference
// to a type name (which eventually refers to a function type).
bool HasPrototype =
getLangOptions().CPlusPlus ||
(D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) ||
(!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
NewFD = FunctionDecl::Create(Context, DC,
D.getIdentifierLoc(),
Name, R, TInfo, SC, isInline, HasPrototype);
}
if (D.isInvalidType())
NewFD->setInvalidDecl();
SetNestedNameSpecifier(NewFD, D);
// Set the lexical context. If the declarator has a C++
// scope specifier, or is the object of a friend declaration, the
// lexical context will be different from the semantic context.
NewFD->setLexicalDeclContext(CurContext);
// Match up the template parameter lists with the scope specifier, then
// determine whether we have a template or a template specialization.
FunctionTemplateDecl *FunctionTemplate = 0;
bool isExplicitSpecialization = false;
bool isFunctionTemplateSpecialization = false;
if (TemplateParameterList *TemplateParams
= MatchTemplateParametersToScopeSpecifier(
D.getDeclSpec().getSourceRange().getBegin(),
D.getCXXScopeSpec(),
(TemplateParameterList**)TemplateParamLists.get(),
TemplateParamLists.size(),
isExplicitSpecialization)) {
if (TemplateParams->size() > 0) {
// This is a function template
// Check that we can declare a template here.
if (CheckTemplateDeclScope(S, TemplateParams))
return 0;
FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
NewFD->getLocation(),
Name, TemplateParams,
NewFD);
FunctionTemplate->setLexicalDeclContext(CurContext);
NewFD->setDescribedFunctionTemplate(FunctionTemplate);
} else {
// This is a function template specialization.
isFunctionTemplateSpecialization = true;
// C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
if (isFriend && isFunctionTemplateSpecialization) {
// We want to remove the "template<>", found here.
SourceRange RemoveRange = TemplateParams->getSourceRange();
// If we remove the template<> and the name is not a
// template-id, we're actually silently creating a problem:
// the friend declaration will refer to an untemplated decl,
// and clearly the user wants a template specialization. So
// we need to insert '<>' after the name.
SourceLocation InsertLoc;
if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
InsertLoc = D.getName().getSourceRange().getEnd();
InsertLoc = PP.getLocForEndOfToken(InsertLoc);
}
Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
<< Name << RemoveRange
<< FixItHint::CreateRemoval(RemoveRange)
<< FixItHint::CreateInsertion(InsertLoc, "<>");
}
}
// FIXME: Free this memory properly.
TemplateParamLists.release();
}
// C++ [dcl.fct.spec]p5:
// The virtual specifier shall only be used in declarations of
// nonstatic class member functions that appear within a
// member-specification of a class declaration; see 10.3.
//
if (isVirtual && !NewFD->isInvalidDecl()) {
if (!isVirtualOkay) {
Diag(D.getDeclSpec().getVirtualSpecLoc(),
diag::err_virtual_non_function);
} else if (!CurContext->isRecord()) {
// 'virtual' was specified outside of the class.
Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class)
<< FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
} else {
// Okay: Add virtual to the method.
CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC);
CurClass->setMethodAsVirtual(NewFD);
}
}
// C++ [dcl.fct.spec]p6:
// The explicit specifier shall be used only in the declaration of a
// constructor or conversion function within its class definition; see 12.3.1
// and 12.3.2.
if (isExplicit && !NewFD->isInvalidDecl()) {
if (!CurContext->isRecord()) {
// 'explicit' was specified outside of the class.
Diag(D.getDeclSpec().getExplicitSpecLoc(),
diag::err_explicit_out_of_class)
<< FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
} else if (!isa<CXXConstructorDecl>(NewFD) &&
!isa<CXXConversionDecl>(NewFD)) {
// 'explicit' was specified on a function that wasn't a constructor
// or conversion function.
Diag(D.getDeclSpec().getExplicitSpecLoc(),
diag::err_explicit_non_ctor_or_conv_function)
<< FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
}
}
// Filter out previous declarations that don't match the scope.
FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage());
if (isFriend) {
// DC is the namespace in which the function is being declared.
assert((DC->isFileContext() || !Previous.empty()) &&
"previously-undeclared friend function being created "
"in a non-namespace context");
// For now, claim that the objects have no previous declaration.
if (FunctionTemplate) {
FunctionTemplate->setObjectOfFriendDecl(false);
FunctionTemplate->setAccess(AS_public);
} else {
NewFD->setObjectOfFriendDecl(false);
}
NewFD->setAccess(AS_public);
}
if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) &&
!CurContext->isRecord()) {
// C++ [class.static]p1:
// A data or function member of a class may be declared static
// in a class definition, in which case it is a static member of
// the class.
// Complain about the 'static' specifier if it's on an out-of-line
// member function definition.
Diag(D.getDeclSpec().getStorageClassSpecLoc(),
diag::err_static_out_of_line)
<< FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
}
// Handle GNU asm-label extension (encoded as an attribute).
if (Expr *E = (Expr*) D.getAsmLabel()) {
// The parser guarantees this is a string.
StringLiteral *SE = cast<StringLiteral>(E);
NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString()));
}
// Copy the parameter declarations from the declarator D to the function
// declaration NewFD, if they are available. First scavenge them into Params.
llvm::SmallVector<ParmVarDecl*, 16> Params;
if (D.getNumTypeObjects() > 0) {
DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
// Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
// function that takes no arguments, not a function that takes a
// single void argument.
// We let through "const void" here because Sema::GetTypeForDeclarator
// already checks for that case.
if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
FTI.ArgInfo[0].Param &&
FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) {
// Empty arg list, don't push any params.
ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>();
// In C++, the empty parameter-type-list must be spelled "void"; a
// typedef of void is not permitted.
if (getLangOptions().CPlusPlus &&
Param->getType().getUnqualifiedType() != Context.VoidTy)
Diag(Param->getLocation(), diag::err_param_typedef_of_void);
// FIXME: Leaks decl?
} else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) {
for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>();
assert(Param->getDeclContext() != NewFD && "Was set before ?");
Param->setDeclContext(NewFD);
Params.push_back(Param);
}
}
} else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
// When we're declaring a function with a typedef, typeof, etc as in the
// following example, we'll need to synthesize (unnamed)
// parameters for use in the declaration.
//
// @code
// typedef void fn(int);
// fn f;
// @endcode
// Synthesize a parameter for each argument type.
for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(),
AE = FT->arg_type_end(); AI != AE; ++AI) {
ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD,
SourceLocation(), 0,
*AI, /*TInfo=*/0,
VarDecl::None, 0);
Param->setImplicit();
Params.push_back(Param);
}
} else {
assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
"Should not need args for typedef of non-prototype fn");
}
// Finally, we know we have the right number of parameters, install them.
NewFD->setParams(Params.data(), Params.size());
// If the declarator is a template-id, translate the parser's template
// argument list into our AST format.
bool HasExplicitTemplateArgs = false;
TemplateArgumentListInfo TemplateArgs;
if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
ASTTemplateArgsPtr TemplateArgsPtr(*this,
TemplateId->getTemplateArgs(),
TemplateId->NumArgs);
translateTemplateArguments(TemplateArgsPtr,
TemplateArgs);
TemplateArgsPtr.release();
HasExplicitTemplateArgs = true;
if (FunctionTemplate) {
// FIXME: Diagnose function template with explicit template
// arguments.
HasExplicitTemplateArgs = false;
} else if (!isFunctionTemplateSpecialization &&
!D.getDeclSpec().isFriendSpecified()) {
// We have encountered something that the user meant to be a
// specialization (because it has explicitly-specified template
// arguments) but that was not introduced with a "template<>" (or had
// too few of them).
Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header)
<< SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)
<< FixItHint::CreateInsertion(
D.getDeclSpec().getSourceRange().getBegin(),
"template<> ");
isFunctionTemplateSpecialization = true;
} else {
// "friend void foo<>(int);" is an implicit specialization decl.
isFunctionTemplateSpecialization = true;
}
} else if (isFriend && isFunctionTemplateSpecialization) {
// This combination is only possible in a recovery case; the user
// wrote something like:
// template <> friend void foo(int);
// which we're recovering from as if the user had written:
// friend void foo<>(int);
// Go ahead and fake up a template id.
HasExplicitTemplateArgs = true;
TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
}
// If it's a friend (and only if it's a friend), it's possible
// that either the specialized function type or the specialized
// template is dependent, and therefore matching will fail. In
// this case, don't check the specialization yet.
if (isFunctionTemplateSpecialization && isFriend &&
(NewFD->getType()->isDependentType() || DC->isDependentContext())) {
assert(HasExplicitTemplateArgs &&
"friend function specialization without template args");
if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
Previous))
NewFD->setInvalidDecl();
} else if (isFunctionTemplateSpecialization) {
if (CheckFunctionTemplateSpecialization(NewFD,
(HasExplicitTemplateArgs ? &TemplateArgs : 0),
Previous))
NewFD->setInvalidDecl();
} else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
if (CheckMemberSpecialization(NewFD, Previous))
NewFD->setInvalidDecl();
}
// Perform semantic checking on the function declaration.
bool OverloadableAttrRequired = false; // FIXME: HACK!
CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization,
Redeclaration, /*FIXME:*/OverloadableAttrRequired);
assert((NewFD->isInvalidDecl() || !Redeclaration ||
Previous.getResultKind() != LookupResult::FoundOverloaded) &&
"previous declaration set still overloaded");
if (isFriend && Redeclaration) {
AccessSpecifier Access = NewFD->getPreviousDeclaration()->getAccess();
if (FunctionTemplate) {
FunctionTemplate->setObjectOfFriendDecl(true);
FunctionTemplate->setAccess(Access);
} else {
NewFD->setObjectOfFriendDecl(true);
}
NewFD->setAccess(Access);
}
// If we have a function template, check the template parameter
// list. This will check and merge default template arguments.
if (FunctionTemplate) {
FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration();
CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
PrevTemplate? PrevTemplate->getTemplateParameters() : 0,
D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate
: TPC_FunctionTemplate);
}
if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) {
// Fake up an access specifier if it's supposed to be a class member.
if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext()))
NewFD->setAccess(AS_public);
// An out-of-line member function declaration must also be a
// definition (C++ [dcl.meaning]p1).
// Note that this is not the case for explicit specializations of
// function templates or member functions of class templates, per
// C++ [temp.expl.spec]p2.
if (!IsFunctionDefinition && !isFriend &&
!isFunctionTemplateSpecialization && !isExplicitSpecialization) {
Diag(NewFD->getLocation(), diag::err_out_of_line_declaration)
<< D.getCXXScopeSpec().getRange();
NewFD->setInvalidDecl();
} else if (!Redeclaration &&
!(isFriend && CurContext->isDependentContext())) {
// The user tried to provide an out-of-line definition for a
// function that is a member of a class or namespace, but there
// was no such member function declared (C++ [class.mfct]p2,
// C++ [namespace.memdef]p2). For example:
//
// class X {
// void f() const;
// };
//
// void X::f() { } // ill-formed
//
// Complain about this problem, and attempt to suggest close
// matches (e.g., those that differ only in cv-qualifiers and
// whether the parameter types are references).
Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match)
<< Name << DC << D.getCXXScopeSpec().getRange();
NewFD->setInvalidDecl();
LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName,
ForRedeclaration);
LookupQualifiedName(Prev, DC);
assert(!Prev.isAmbiguous() &&
"Cannot have an ambiguity in previous-declaration lookup");
for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
Func != FuncEnd; ++Func) {
if (isa<FunctionDecl>(*Func) &&
isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD))
Diag((*Func)->getLocation(), diag::note_member_def_close_match);
}
}
}
// Handle attributes. We need to have merged decls when handling attributes
// (for example to check for conflicts, etc).
// FIXME: This needs to happen before we merge declarations. Then,
// let attribute merging cope with attribute conflicts.
ProcessDeclAttributes(S, NewFD, D);
// attributes declared post-definition are currently ignored
if (Redeclaration && Previous.isSingleResult()) {
const FunctionDecl *Def;
FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl());
if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) {
Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition);
Diag(Def->getLocation(), diag::note_previous_definition);
}
}
AddKnownFunctionAttributes(NewFD);
if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) {
// If a function name is overloadable in C, then every function
// with that name must be marked "overloadable".
Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
<< Redeclaration << NewFD;
if (!Previous.empty())
Diag(Previous.getRepresentativeDecl()->getLocation(),
diag::note_attribute_overloadable_prev_overload);
NewFD->addAttr(::new (Context) OverloadableAttr());
}
// If this is a locally-scoped extern C function, update the
// map of such names.
if (CurContext->isFunctionOrMethod() && NewFD->isExternC()
&& !NewFD->isInvalidDecl())
RegisterLocallyScopedExternCDecl(NewFD, Previous, S);
// Set this FunctionDecl's range up to the right paren.
NewFD->setLocEnd(D.getSourceRange().getEnd());
if (FunctionTemplate && NewFD->isInvalidDecl())
FunctionTemplate->setInvalidDecl();
if (FunctionTemplate)
return FunctionTemplate;
// Keep track of static, non-inlined function definitions that
// have not been used. We will warn later.
// FIXME: Also include static functions declared but not defined.
if (!NewFD->isInvalidDecl() && IsFunctionDefinition
&& !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage
&& !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>()
&& !NewFD->hasAttr<ConstructorAttr>()
&& !NewFD->hasAttr<DestructorAttr>())
UnusedStaticFuncs.push_back(NewFD);
return NewFD;
}
/// \brief Perform semantic checking of a new function declaration.
///
/// Performs semantic analysis of the new function declaration
/// NewFD. This routine performs all semantic checking that does not
/// require the actual declarator involved in the declaration, and is
/// used both for the declaration of functions as they are parsed
/// (called via ActOnDeclarator) and for the declaration of functions
/// that have been instantiated via C++ template instantiation (called
/// via InstantiateDecl).
///
/// \param IsExplicitSpecialiation whether this new function declaration is
/// an explicit specialization of the previous declaration.
///
/// This sets NewFD->isInvalidDecl() to true if there was an error.
void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
LookupResult &Previous,
bool IsExplicitSpecialization,
bool &Redeclaration,
bool &OverloadableAttrRequired) {
// If NewFD is already known erroneous, don't do any of this checking.
if (NewFD->isInvalidDecl())
return;
if (NewFD->getResultType()->isVariablyModifiedType()) {
// Functions returning a variably modified type violate C99 6.7.5.2p2
// because all functions have linkage.
Diag(NewFD->getLocation(), diag::err_vm_func_decl);
return NewFD->setInvalidDecl();
}
if (NewFD->isMain())
CheckMain(NewFD);
// Check for a previous declaration of this name.
if (Previous.empty() && NewFD->isExternC()) {
// Since we did not find anything by this name and we're declaring
// an extern "C" function, look for a non-visible extern "C"
// declaration with the same name.
llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
= LocallyScopedExternalDecls.find(NewFD->getDeclName());
if (Pos != LocallyScopedExternalDecls.end())
Previous.addDecl(Pos->second);
}
// Merge or overload the declaration with an existing declaration of
// the same name, if appropriate.
if (!Previous.empty()) {
Initial implementation of function overloading in C. This commit adds a new attribute, "overloadable", that enables C++ function overloading in C. The attribute can only be added to function declarations, e.g., int *f(int) __attribute__((overloadable)); If the "overloadable" attribute exists on a function with a given name, *all* functions with that name (and in that scope) must have the "overloadable" attribute. Sets of overloaded functions with the "overloadable" attribute then follow the normal C++ rules for overloaded functions, e.g., overloads must have different parameter-type-lists from each other. When calling an overloaded function in C, we follow the same overloading rules as C++, with three extensions to the set of standard conversions: - A value of a given struct or union type T can be converted to the type T. This is just the identity conversion. (In C++, this would go through a copy constructor). - A value of pointer type T* can be converted to a value of type U* if T and U are compatible types. This conversion has Conversion rank (it's considered a pointer conversion in C). - A value of type T can be converted to a value of type U if T and U are compatible (and are not both pointer types). This conversion has Conversion rank (it's considered to be a new kind of conversion unique to C, a "compatible" conversion). Known defects (and, therefore, next steps): 1) The standard-conversion handling does not understand conversions involving _Complex or vector extensions, so it is likely to get these wrong. We need to add these conversions. 2) All overloadable functions with the same name will have the same linkage name, which means we'll get a collision in the linker (if not sooner). We'll need to mangle the names of these functions. llvm-svn: 64336
2009-02-12 07:02:49 +08:00
// Determine whether NewFD is an overload of PrevDecl or
// a declaration that requires merging. If it's an overload,
// there's no more work to do here; we'll just add the new
// function to the scope.
NamedDecl *OldDecl = 0;
if (!AllowOverloadingOfFunction(Previous, Context)) {
Redeclaration = true;
OldDecl = Previous.getFoundDecl();
} else {
if (!getLangOptions().CPlusPlus) {
OverloadableAttrRequired = true;
// Functions marked "overloadable" must have a prototype (that
// we can't get through declaration merging).
if (!NewFD->getType()->getAs<FunctionProtoType>()) {
Diag(NewFD->getLocation(),
diag::err_attribute_overloadable_no_prototype)
<< NewFD;
Redeclaration = true;
// Turn this into a variadic function with no parameters.
QualType R = Context.getFunctionType(
NewFD->getType()->getAs<FunctionType>()->getResultType(),
0, 0, true, 0, false, false, 0, 0,
FunctionType::ExtInfo());
NewFD->setType(R);
return NewFD->setInvalidDecl();
}
}
switch (CheckOverload(NewFD, Previous, OldDecl)) {
case Ovl_Match:
Redeclaration = true;
if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) {
HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl));
Redeclaration = false;
}
break;
case Ovl_NonFunction:
Redeclaration = true;
break;
case Ovl_Overload:
Redeclaration = false;
break;
}
}
if (Redeclaration) {
// NewFD and OldDecl represent declarations that need to be
// merged.
if (MergeFunctionDecl(NewFD, OldDecl))
return NewFD->setInvalidDecl();
Previous.clear();
Previous.addDecl(OldDecl);
if (FunctionTemplateDecl *OldTemplateDecl
= dyn_cast<FunctionTemplateDecl>(OldDecl)) {
NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
FunctionTemplateDecl *NewTemplateDecl
= NewFD->getDescribedFunctionTemplate();
assert(NewTemplateDecl && "Template/non-template mismatch");
if (CXXMethodDecl *Method
= dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
Method->setAccess(OldTemplateDecl->getAccess());
NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
}
// If this is an explicit specialization of a member that is a function
// template, mark it as a member specialization.
if (IsExplicitSpecialization &&
NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
NewTemplateDecl->setMemberSpecialization();
assert(OldTemplateDecl->isMemberSpecialization());
}
} else {
if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions
NewFD->setAccess(OldDecl->getAccess());
NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
}
}
}
// Semantic checking for this function declaration (in isolation).
if (getLangOptions().CPlusPlus) {
// C++-specific checks.
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
CheckConstructor(Constructor);
} else if (CXXDestructorDecl *Destructor =
dyn_cast<CXXDestructorDecl>(NewFD)) {
CXXRecordDecl *Record = Destructor->getParent();
QualType ClassType = Context.getTypeDeclType(Record);
// FIXME: Shouldn't we be able to perform thisc heck even when the class
// type is dependent? Both gcc and edg can handle that.
if (!ClassType->isDependentType()) {
DeclarationName Name
= Context.DeclarationNames.getCXXDestructorName(
Context.getCanonicalType(ClassType));
if (NewFD->getDeclName() != Name) {
Diag(NewFD->getLocation(), diag::err_destructor_name);
return NewFD->setInvalidDecl();
}
}
Record->setUserDeclaredDestructor(true);
// C++ [class]p4: A POD-struct is an aggregate class that has [...] no
// user-defined destructor.
Record->setPOD(false);
// C++ [class.dtor]p3: A destructor is trivial if it is an implicitly-
// declared destructor.
// FIXME: C++0x: don't do this for "= default" destructors
Record->setHasTrivialDestructor(false);
} else if (CXXConversionDecl *Conversion
= dyn_cast<CXXConversionDecl>(NewFD)) {
ActOnConversionDeclarator(Conversion);
}
// Find any virtual functions that this function overrides.
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
if (!Method->isFunctionTemplateSpecialization() &&
!Method->getDescribedFunctionTemplate())
AddOverriddenMethods(Method->getParent(), Method);
}
// Additional checks for the destructor; make sure we do this after we
// figure out whether the destructor is virtual.
if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD))
if (!Destructor->getParent()->isDependentType())
CheckDestructor(Destructor);
// Extra checking for C++ overloaded operators (C++ [over.oper]).
if (NewFD->isOverloadedOperator() &&
CheckOverloadedOperatorDeclaration(NewFD))
return NewFD->setInvalidDecl();
// Extra checking for C++0x literal operators (C++0x [over.literal]).
if (NewFD->getLiteralIdentifier() &&
CheckLiteralOperatorDeclaration(NewFD))
return NewFD->setInvalidDecl();
// In C++, check default arguments now that we have merged decls. Unless
// the lexical context is the class, because in this case this is done
// during delayed parsing anyway.
if (!CurContext->isRecord())
CheckCXXDefaultArguments(NewFD);
}
}
void Sema::CheckMain(FunctionDecl* FD) {
// C++ [basic.start.main]p3: A program that declares main to be inline
// or static is ill-formed.
// C99 6.7.4p4: In a hosted environment, the inline function specifier
// shall not appear in a declaration of main.
// static main is not an error under C99, but we should warn about it.
bool isInline = FD->isInlineSpecified();
bool isStatic = FD->getStorageClass() == FunctionDecl::Static;
if (isInline || isStatic) {
unsigned diagID = diag::warn_unusual_main_decl;
if (isInline || getLangOptions().CPlusPlus)
diagID = diag::err_unusual_main_decl;
int which = isStatic + (isInline << 1) - 1;
Diag(FD->getLocation(), diagID) << which;
}
QualType T = FD->getType();
assert(T->isFunctionType() && "function decl is not of function type");
const FunctionType* FT = T->getAs<FunctionType>();
if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) {
// TODO: add a replacement fixit to turn the return type into 'int'.
Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint);
FD->setInvalidDecl(true);
}
// Treat protoless main() as nullary.
if (isa<FunctionNoProtoType>(FT)) return;
const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
unsigned nparams = FTP->getNumArgs();
assert(FD->getNumParams() == nparams);
bool HasExtraParameters = (nparams > 3);
// Darwin passes an undocumented fourth argument of type char**. If
// other platforms start sprouting these, the logic below will start
// getting shifty.
if (nparams == 4 &&
Context.Target.getTriple().getOS() == llvm::Triple::Darwin)
HasExtraParameters = false;
if (HasExtraParameters) {
Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
FD->setInvalidDecl(true);
nparams = 3;
}
// FIXME: a lot of the following diagnostics would be improved
// if we had some location information about types.
QualType CharPP =
Context.getPointerType(Context.getPointerType(Context.CharTy));
QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
for (unsigned i = 0; i < nparams; ++i) {
QualType AT = FTP->getArgType(i);
bool mismatch = true;
if (Context.hasSameUnqualifiedType(AT, Expected[i]))
mismatch = false;
else if (Expected[i] == CharPP) {
// As an extension, the following forms are okay:
// char const **
// char const * const *
// char * const *
QualifierCollector qs;
const PointerType* PT;
if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
(PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
(QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) {
qs.removeConst();
mismatch = !qs.empty();
}
}
if (mismatch) {
Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
// TODO: suggest replacing given type with expected type
FD->setInvalidDecl(true);
}
}
if (nparams == 1 && !FD->isInvalidDecl()) {
Diag(FD->getLocation(), diag::warn_main_one_arg);
}
}
bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
// FIXME: Need strict checking. In C89, we need to check for
// any assignment, increment, decrement, function-calls, or
// commas outside of a sizeof. In C99, it's the same list,
// except that the aforementioned are allowed in unevaluated
// expressions. Everything else falls under the
// "may accept other forms of constant expressions" exception.
// (We never end up here for C++, so the constant expression
// rules there don't matter.)
if (Init->isConstantInitializer(Context))
return false;
Diag(Init->getExprLoc(), diag::err_init_element_not_constant)
<< Init->getSourceRange();
return true;
}
void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) {
AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false);
}
/// AddInitializerToDecl - Adds the initializer Init to the
/// declaration dcl. If DirectInit is true, this is C++ direct
/// initialization rather than copy initialization.
void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) {
Decl *RealDecl = dcl.getAs<Decl>();
// If there is no declaration, there was an error parsing it. Just ignore
// the initializer.
if (RealDecl == 0)
return;
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
// With declarators parsed the way they are, the parser cannot
// distinguish between a normal initializer and a pure-specifier.
// Thus this grotesque test.
IntegerLiteral *IL;
Expr *Init = static_cast<Expr *>(init.get());
if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
Context.getCanonicalType(IL->getType()) == Context.IntTy)
CheckPureMethod(Method, Init->getSourceRange());
else {
Diag(Method->getLocation(), diag::err_member_function_initialization)
<< Method->getDeclName() << Init->getSourceRange();
Method->setInvalidDecl();
}
return;
}
VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
if (!VDecl) {
if (getLangOptions().CPlusPlus &&
RealDecl->getLexicalDeclContext()->isRecord() &&
isa<NamedDecl>(RealDecl))
Diag(RealDecl->getLocation(), diag::err_member_initialization)
<< cast<NamedDecl>(RealDecl)->getDeclName();
else
Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
RealDecl->setInvalidDecl();
return;
}
// A definition must end up with a complete type, which means it must be
// complete with the restriction that an array type might be completed by the
// initializer; note that later code assumes this restriction.
QualType BaseDeclType = VDecl->getType();
if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
BaseDeclType = Array->getElementType();
if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
diag::err_typecheck_decl_incomplete_type)) {
RealDecl->setInvalidDecl();
return;
}
// The variable can not have an abstract class type.
if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
diag::err_abstract_type_in_decl,
AbstractVariableType))
VDecl->setInvalidDecl();
const VarDecl *Def;
if ((Def = VDecl->getDefinition()) && Def != VDecl) {
Diag(VDecl->getLocation(), diag::err_redefinition)
<< VDecl->getDeclName();
Diag(Def->getLocation(), diag::note_previous_definition);
VDecl->setInvalidDecl();
return;
}
// Take ownership of the expression, now that we're sure we have somewhere
// to put it.
Expr *Init = init.takeAs<Expr>();
assert(Init && "missing initializer");
// Capture the variable that is being initialized and the style of
// initialization.
InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
// FIXME: Poor source location information.
InitializationKind Kind
= DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(),
Init->getLocStart(),
Init->getLocEnd())
: InitializationKind::CreateCopy(VDecl->getLocation(),
Init->getLocStart());
// Get the decls type and save a reference for later, since
// CheckInitializerTypes may change it.
QualType DclT = VDecl->getType(), SavT = DclT;
if (VDecl->isBlockVarDecl()) {
if (VDecl->hasExternalStorage()) { // C99 6.7.8p5
Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
VDecl->setInvalidDecl();
} else if (!VDecl->isInvalidDecl()) {
InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind,
MultiExprArg(*this, (void**)&Init, 1),
&DclT);
if (Result.isInvalid()) {
VDecl->setInvalidDecl();
return;
}
Init = Result.takeAs<Expr>();
// C++ 3.6.2p2, allow dynamic initialization of static initializers.
// Don't check invalid declarations to avoid emitting useless diagnostics.
if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4.
CheckForConstantInitializer(Init, DclT);
}
}
} else if (VDecl->isStaticDataMember() &&
VDecl->getLexicalDeclContext()->isRecord()) {
// This is an in-class initialization for a static data member, e.g.,
//
// struct S {
// static const int value = 17;
// };
// Attach the initializer
VDecl->setInit(Init);
// C++ [class.mem]p4:
// A member-declarator can contain a constant-initializer only
// if it declares a static member (9.4) of const integral or
// const enumeration type, see 9.4.2.
QualType T = VDecl->getType();
if (!T->isDependentType() &&
(!Context.getCanonicalType(T).isConstQualified() ||
!T->isIntegralType())) {
Diag(VDecl->getLocation(), diag::err_member_initialization)
<< VDecl->getDeclName() << Init->getSourceRange();
VDecl->setInvalidDecl();
} else {
// C++ [class.static.data]p4:
// If a static data member is of const integral or const
// enumeration type, its declaration in the class definition
// can specify a constant-initializer which shall be an
// integral constant expression (5.19).
if (!Init->isTypeDependent() &&
!Init->getType()->isIntegralType()) {
// We have a non-dependent, non-integral or enumeration type.
Diag(Init->getSourceRange().getBegin(),
diag::err_in_class_initializer_non_integral_type)
<< Init->getType() << Init->getSourceRange();
VDecl->setInvalidDecl();
} else if (!Init->isTypeDependent() && !Init->isValueDependent()) {
// Check whether the expression is a constant expression.
llvm::APSInt Value;
SourceLocation Loc;
if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) {
Diag(Loc, diag::err_in_class_initializer_non_constant)
<< Init->getSourceRange();
VDecl->setInvalidDecl();
} else if (!VDecl->getType()->isDependentType())
ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast);
}
}
} else if (VDecl->isFileVarDecl()) {
if (VDecl->getStorageClass() == VarDecl::Extern)
Diag(VDecl->getLocation(), diag::warn_extern_init);
if (!VDecl->isInvalidDecl()) {
InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind,
MultiExprArg(*this, (void**)&Init, 1),
&DclT);
if (Result.isInvalid()) {
VDecl->setInvalidDecl();
return;
}
Init = Result.takeAs<Expr>();
}
// C++ 3.6.2p2, allow dynamic initialization of static initializers.
// Don't check invalid declarations to avoid emitting useless diagnostics.
if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
// C99 6.7.8p4. All file scoped initializers need to be constant.
CheckForConstantInitializer(Init, DclT);
}
}
// If the type changed, it means we had an incomplete type that was
// completed by the initializer. For example:
// int ary[] = { 1, 3, 5 };
// "ary" transitions from a VariableArrayType to a ConstantArrayType.
if (!VDecl->isInvalidDecl() && (DclT != SavT)) {
VDecl->setType(DclT);
Init->setType(DclT);
}
Init = MaybeCreateCXXExprWithTemporaries(Init);
// Attach the initializer to the decl.
VDecl->setInit(Init);
if (getLangOptions().CPlusPlus) {
// Make sure we mark the destructor as used if necessary.
QualType InitType = VDecl->getType();
while (const ArrayType *Array = Context.getAsArrayType(InitType))
InitType = Context.getBaseElementType(Array);
if (const RecordType *Record = InitType->getAs<RecordType>())
FinalizeVarWithDestructor(VDecl, Record);
}
return;
}
/// ActOnInitializerError - Given that there was an error parsing an
/// initializer for the given declaration, try to return to some form
/// of sanity.
void Sema::ActOnInitializerError(DeclPtrTy dcl) {
// Our main concern here is re-establishing invariants like "a
// variable's type is either dependent or complete".
Decl *D = dcl.getAs<Decl>();
if (!D || D->isInvalidDecl()) return;
VarDecl *VD = dyn_cast<VarDecl>(D);
if (!VD) return;
QualType Ty = VD->getType();
if (Ty->isDependentType()) return;
// Require a complete type.
if (RequireCompleteType(VD->getLocation(),
Context.getBaseElementType(Ty),
diag::err_typecheck_decl_incomplete_type)) {
VD->setInvalidDecl();
return;
}
// Require an abstract type.
if (RequireNonAbstractType(VD->getLocation(), Ty,
diag::err_abstract_type_in_decl,
AbstractVariableType)) {
VD->setInvalidDecl();
return;
}
// Don't bother complaining about constructors or destructors,
// though.
}
void Sema::ActOnUninitializedDecl(DeclPtrTy dcl,
bool TypeContainsUndeducedAuto) {
Decl *RealDecl = dcl.getAs<Decl>();
// If there is no declaration, there was an error parsing it. Just ignore it.
if (RealDecl == 0)
return;
if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
QualType Type = Var->getType();
// C++0x [dcl.spec.auto]p3
if (TypeContainsUndeducedAuto) {
Diag(Var->getLocation(), diag::err_auto_var_requires_init)
<< Var->getDeclName() << Type;
Var->setInvalidDecl();
return;
}
switch (Var->isThisDeclarationADefinition()) {
case VarDecl::Definition:
if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
break;
// We have an out-of-line definition of a static data member
// that has an in-class initializer, so we type-check this like
// a declaration.
//
// Fall through
case VarDecl::DeclarationOnly:
// It's only a declaration.
// Block scope. C99 6.7p7: If an identifier for an object is
// declared with no linkage (C99 6.2.2p6), the type for the
// object shall be complete.
if (!Type->isDependentType() && Var->isBlockVarDecl() &&
!Var->getLinkage() && !Var->isInvalidDecl() &&
RequireCompleteType(Var->getLocation(), Type,
diag::err_typecheck_decl_incomplete_type))
Var->setInvalidDecl();
// Make sure that the type is not abstract.
if (!Type->isDependentType() && !Var->isInvalidDecl() &&
RequireNonAbstractType(Var->getLocation(), Type,
diag::err_abstract_type_in_decl,
AbstractVariableType))
Var->setInvalidDecl();
return;
case VarDecl::TentativeDefinition:
// File scope. C99 6.9.2p2: A declaration of an identifier for an
// object that has file scope without an initializer, and without a
// storage-class specifier or with the storage-class specifier "static",
// constitutes a tentative definition. Note: A tentative definition with
// external linkage is valid (C99 6.2.2p5).
if (!Var->isInvalidDecl()) {
if (const IncompleteArrayType *ArrayT
= Context.getAsIncompleteArrayType(Type)) {
if (RequireCompleteType(Var->getLocation(),
ArrayT->getElementType(),
diag::err_illegal_decl_array_incomplete_type))
Var->setInvalidDecl();
} else if (Var->getStorageClass() == VarDecl::Static) {
// C99 6.9.2p3: If the declaration of an identifier for an object is
// a tentative definition and has internal linkage (C99 6.2.2p3), the
// declared type shall not be an incomplete type.
// NOTE: code such as the following
// static struct s;
// struct s { int a; };
// is accepted by gcc. Hence here we issue a warning instead of
// an error and we do not invalidate the static declaration.
// NOTE: to avoid multiple warnings, only check the first declaration.
if (Var->getPreviousDeclaration() == 0)
RequireCompleteType(Var->getLocation(), Type,
diag::ext_typecheck_decl_incomplete_type);
}
}
// Record the tentative definition; we're done.
if (!Var->isInvalidDecl())
TentativeDefinitions.push_back(Var);
return;
}
// Provide a specific diagnostic for uninitialized variable
// definitions with incomplete array type.
if (Type->isIncompleteArrayType()) {
Diag(Var->getLocation(),
diag::err_typecheck_incomplete_array_needs_initializer);
Var->setInvalidDecl();
return;
}
// Provide a specific diagnostic for uninitialized variable
// definitions with reference type.
if (Type->isReferenceType()) {
Diag(Var->getLocation(), diag::err_reference_var_requires_init)
<< Var->getDeclName()
<< SourceRange(Var->getLocation(), Var->getLocation());
Var->setInvalidDecl();
return;
}
// Do not attempt to type-check the default initializer for a
// variable with dependent type.
if (Type->isDependentType())
return;
if (Var->isInvalidDecl())
return;
if (RequireCompleteType(Var->getLocation(),
Context.getBaseElementType(Type),
diag::err_typecheck_decl_incomplete_type)) {
Var->setInvalidDecl();
return;
}
// The variable can not have an abstract class type.
if (RequireNonAbstractType(Var->getLocation(), Type,
diag::err_abstract_type_in_decl,
AbstractVariableType)) {
Var->setInvalidDecl();
return;
}
const RecordType *Record
= Context.getBaseElementType(Type)->getAs<RecordType>();
if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x &&
cast<CXXRecordDecl>(Record->getDecl())->isPOD()) {
// C++03 [dcl.init]p9:
// If no initializer is specified for an object, and the
// object is of (possibly cv-qualified) non-POD class type (or
// array thereof), the object shall be default-initialized; if
// the object is of const-qualified type, the underlying class
// type shall have a user-declared default
// constructor. Otherwise, if no initializer is specified for
// a non- static object, the object and its subobjects, if
// any, have an indeterminate initial value); if the object
// or any of its subobjects are of const-qualified type, the
// program is ill-formed.
// FIXME: DPG thinks it is very fishy that C++0x disables this.
} else {
InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
InitializationKind Kind
= InitializationKind::CreateDefault(Var->getLocation());
InitializationSequence InitSeq(*this, Entity, Kind, 0, 0);
OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind,
MultiExprArg(*this, 0, 0));
if (Init.isInvalid())
Var->setInvalidDecl();
else if (Init.get())
Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>()));
}
if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record)
FinalizeVarWithDestructor(Var, Record);
}
}
Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
DeclPtrTy *Group,
unsigned NumDecls) {
llvm::SmallVector<Decl*, 8> Decls;
if (DS.isTypeSpecOwned())
Decls.push_back((Decl*)DS.getTypeRep());
for (unsigned i = 0; i != NumDecls; ++i)
if (Decl *D = Group[i].getAs<Decl>())
Decls.push_back(D);
return DeclGroupPtrTy::make(DeclGroupRef::Create(Context,
Decls.data(), Decls.size()));
}
/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
/// to introduce parameters into function prototype scope.
Sema::DeclPtrTy
Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
const DeclSpec &DS = D.getDeclSpec();
// Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
VarDecl::StorageClass StorageClass = VarDecl::None;
if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
StorageClass = VarDecl::Register;
} else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
Diag(DS.getStorageClassSpecLoc(),
diag::err_invalid_storage_class_in_func_decl);
D.getMutableDeclSpec().ClearStorageClassSpecs();
}
if (D.getDeclSpec().isThreadSpecified())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
DiagnoseFunctionSpecifiers(D);
// Check that there are no default arguments inside the type of this
// parameter (C++ only).
if (getLangOptions().CPlusPlus)
CheckExtraCXXDefaultArguments(D);
TypeSourceInfo *TInfo = 0;
TagDecl *OwnedDecl = 0;
QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl);
if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) {
// C++ [dcl.fct]p6:
// Types shall not be defined in return or parameter types.
Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type)
<< Context.getTypeDeclType(OwnedDecl);
}
// Check for redeclaration of parameters, e.g. int foo(int x, int x);
IdentifierInfo *II = D.getIdentifier();
if (II) {
LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
ForRedeclaration);
LookupName(R, S);
if (R.isSingleResult()) {
NamedDecl *PrevDecl = R.getFoundDecl();
if (PrevDecl->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
// Just pretend that we didn't see the previous declaration.
PrevDecl = 0;
} else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) {
Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
// Recover by removing the name
II = 0;
D.SetIdentifier(0, D.getIdentifierLoc());
D.setInvalidType(true);
}
}
}
// Parameters can not be abstract class types.
// For record types, this is done by the AbstractClassUsageDiagnoser once
// the class has been completely parsed.
if (!CurContext->isRecord() &&
RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType,
diag::err_abstract_type_in_decl,
AbstractParamType))
D.setInvalidType(true);
QualType T = adjustParameterType(parmDeclType);
// Temporarily put parameter variables in the translation unit, not
// the enclosing context. This prevents them from accidentally
// looking like class members in C++.
DeclContext *DC = Context.getTranslationUnitDecl();
ParmVarDecl *New
= ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II,
T, TInfo, StorageClass, 0);
if (D.isInvalidType())
New->setInvalidDecl();
// Parameter declarators cannot be interface types. All ObjC objects are
// passed by reference.
if (T->isObjCInterfaceType()) {
Diag(D.getIdentifierLoc(),
diag::err_object_cannot_be_passed_returned_by_value) << 1 << T;
New->setInvalidDecl();
}
// Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
if (D.getCXXScopeSpec().isSet()) {
Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
<< D.getCXXScopeSpec().getRange();
New->setInvalidDecl();
}
// ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
// duration shall not be qualified by an address-space qualifier."
// Since all parameters have automatic store duration, they can not have
// an address space.
if (T.getAddressSpace() != 0) {
Diag(D.getIdentifierLoc(),
diag::err_arg_with_address_space);
New->setInvalidDecl();
}
// Add the parameter declaration into this scope.
S->AddDecl(DeclPtrTy::make(New));
if (II)
IdResolver.AddDecl(New);
ProcessDeclAttributes(S, New, D);
if (New->hasAttr<BlocksAttr>()) {
Diag(New->getLocation(), diag::err_block_on_nonlocal);
}
return DeclPtrTy::make(New);
}
void Sema::ActOnObjCCatchParam(DeclPtrTy D) {
ParmVarDecl *Param = cast<ParmVarDecl>(D.getAs<Decl>());
Param->setDeclContext(CurContext);
}
void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
SourceLocation LocAfterDecls) {
assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function &&
"Not a function declarator!");
DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
// Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
// for a K&R function.
if (!FTI.hasPrototype) {
for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) {
--i;
if (FTI.ArgInfo[i].Param == 0) {
llvm::SmallString<256> Code;
llvm::raw_svector_ostream(Code) << " int "
<< FTI.ArgInfo[i].Ident->getName()
<< ";\n";
Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared)
<< FTI.ArgInfo[i].Ident
<< FixItHint::CreateInsertion(LocAfterDecls, Code.str());
// Implicitly declare the argument as type 'int' for lack of a better
// type.
DeclSpec DS;
const char* PrevSpec; // unused
unsigned DiagID; // unused
DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc,
PrevSpec, DiagID);
Declarator ParamD(DS, Declarator::KNRTypeListContext);
ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc);
FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD);
}
}
}
}
Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope,
Declarator &D) {
assert(getCurFunctionDecl() == 0 && "Function parsing confused");
assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function &&
"Not a function declarator!");
DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
if (FTI.hasPrototype) {
// FIXME: Diagnose arguments without names in C.
}
Scope *ParentScope = FnBodyScope->getParent();
DeclPtrTy DP = HandleDeclarator(ParentScope, D,
MultiTemplateParamsArg(*this),
/*IsFunctionDefinition=*/true);
return ActOnStartOfFunctionDef(FnBodyScope, DP);
}
static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) {
// Don't warn about invalid declarations.
if (FD->isInvalidDecl())
return false;
// Or declarations that aren't global.
if (!FD->isGlobal())
return false;
// Don't warn about C++ member functions.
if (isa<CXXMethodDecl>(FD))
return false;
// Don't warn about 'main'.
if (FD->isMain())
return false;
// Don't warn about inline functions.
if (FD->isInlineSpecified())
return false;
// Don't warn about function templates.
if (FD->getDescribedFunctionTemplate())
return false;
// Don't warn about function template specializations.
if (FD->isFunctionTemplateSpecialization())
return false;
bool MissingPrototype = true;
for (const FunctionDecl *Prev = FD->getPreviousDeclaration();
Prev; Prev = Prev->getPreviousDeclaration()) {
// Ignore any declarations that occur in function or method
// scope, because they aren't visible from the header.
if (Prev->getDeclContext()->isFunctionOrMethod())
continue;
MissingPrototype = !Prev->getType()->isFunctionProtoType();
break;
}
return MissingPrototype;
}
Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) {
// Clear the last template instantiation error context.
LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
if (!D)
return D;
FunctionDecl *FD = 0;
if (FunctionTemplateDecl *FunTmpl
= dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>()))
FD = FunTmpl->getTemplatedDecl();
else
FD = cast<FunctionDecl>(D.getAs<Decl>());
// Enter a new function scope
PushFunctionScope();
// See if this is a redefinition.
// But don't complain if we're in GNU89 mode and the previous definition
// was an extern inline function.
const FunctionDecl *Definition;
if (FD->getBody(Definition) &&
!canRedefineFunction(Definition, getLangOptions())) {
Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
Diag(Definition->getLocation(), diag::note_previous_definition);
}
// Builtin functions cannot be defined.
if (unsigned BuiltinID = FD->getBuiltinID()) {
if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
FD->setInvalidDecl();
}
}
// The return type of a function definition must be complete
// (C99 6.9.1p3, C++ [dcl.fct]p6).
QualType ResultType = FD->getResultType();
if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
!FD->isInvalidDecl() &&
RequireCompleteType(FD->getLocation(), ResultType,
diag::err_func_def_incomplete_result))
FD->setInvalidDecl();
// GNU warning -Wmissing-prototypes:
// Warn if a global function is defined without a previous
// prototype declaration. This warning is issued even if the
// definition itself provides a prototype. The aim is to detect
// global functions that fail to be declared in header files.
if (ShouldWarnAboutMissingPrototype(FD))
Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
if (FnBodyScope)
PushDeclContext(FnBodyScope, FD);
// Check the validity of our function parameters
CheckParmsForFunctionDef(FD);
bool ShouldCheckShadow =
Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored;
// Introduce our parameters into the function scope
for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) {
ParmVarDecl *Param = FD->getParamDecl(p);
Param->setOwningFunction(FD);
// If this has an identifier, add it to the scope stack.
if (Param->getIdentifier() && FnBodyScope) {
if (ShouldCheckShadow)
CheckShadow(FnBodyScope, Param);
PushOnScopeChains(Param, FnBodyScope);
}
}
// Checking attributes of current function definition
// dllimport attribute.
if (FD->getAttr<DLLImportAttr>() &&
(!FD->getAttr<DLLExportAttr>())) {
// dllimport attribute cannot be applied to definition.
if (!(FD->getAttr<DLLImportAttr>())->isInherited()) {
Diag(FD->getLocation(),
diag::err_attribute_can_be_applied_only_to_symbol_declaration)
<< "dllimport";
FD->setInvalidDecl();
return DeclPtrTy::make(FD);
}
// Visual C++ appears to not think this is an issue, so only issue
// a warning when Microsoft extensions are disabled.
if (!LangOpts.Microsoft) {
// If a symbol previously declared dllimport is later defined, the
// attribute is ignored in subsequent references, and a warning is
// emitted.
Diag(FD->getLocation(),
diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
<< FD->getNameAsCString() << "dllimport";
}
}
return DeclPtrTy::make(FD);
}
Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) {
return ActOnFinishFunctionBody(D, move(BodyArg), false);
}
Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg,
bool IsInstantiation) {
Decl *dcl = D.getAs<Decl>();
Stmt *Body = BodyArg.takeAs<Stmt>();
FunctionDecl *FD = 0;
FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl);
if (FunTmpl)
FD = FunTmpl->getTemplatedDecl();
else
FD = dyn_cast_or_null<FunctionDecl>(dcl);
sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
if (FD) {
FD->setBody(Body);
if (FD->isMain()) {
// C and C++ allow for main to automagically return 0.
// Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3.
FD->setHasImplicitReturnZero(true);
WP.disableCheckFallThrough();
}
if (!FD->isInvalidDecl())
DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD))
MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method);
assert(FD == getCurFunctionDecl() && "Function parsing confused");
} else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
2009-02-17 03:27:54 +08:00
assert(MD == getCurMethodDecl() && "Method parsing confused");
MD->setBody(Body);
MD->setEndLoc(Body->getLocEnd());
if (!MD->isInvalidDecl())
DiagnoseUnusedParameters(MD->param_begin(), MD->param_end());
} else {
Body->Destroy(Context);
return DeclPtrTy();
}
// Verify and clean out per-function state.
Start of checking for gotos which jump to an illegal destination. As far as I know, this catches all cases of jumping into the scope of a variable with a variably modified type (excluding statement expressions) in C. This is missing some stuff we probably want to check (other kinds of variably modified declarations, statement expressions, indirect gotos/addresses of labels in a scope, ObjC @try/@finally, cleanup attribute), the diagnostics aren't very good, and it's not particularly efficient, but it's a decent start. This patch is a slightly modified version of the patch I attached to PR3259, and it fixes that bug. I was sort of planning on improving it, but I think it's okay as-is, especially since it looks like CodeGen doesn't have any use for this sort of data structure. The only significant change I can think of from the version I attached to PR3259 is that this version skips running the checking code when a function doesn't contain any labels. This patch doesn't cover case statements, which also need similar checking; I'm not sure how we should deal with that. Extending the goto checking to also check case statements wouldn't be too hard; it's just a matter of keeping track of the scope of the closest switch and checking that the scope of every case is the same as the scope of the switch. That said, it would likely be a performance hit to run this check on every function (it's an extra pass over the entire function), so we probably want some other solution. llvm-svn: 65678
2009-02-28 13:41:13 +08:00
// Check goto/label use.
for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator
I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) {
LabelStmt *L = I->second;
// Verify that we have no forward references left. If so, there was a goto
// or address of a label taken, but no definition of it. Label fwd
// definitions are indicated with a null substmt.
if (L->getSubStmt() != 0)
continue;
// Emit error.
Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName();
// At this point, we have gotos that use the bogus label. Stitch it into
// the function body so that they aren't leaked and that the AST is well
// formed.
if (Body == 0) {
// The whole function wasn't parsed correctly, just delete this.
L->Destroy(Context);
continue;
}
// Otherwise, the body is valid: we want to stitch the label decl into the
// function somewhere so that it is properly owned and so that the goto
// has a valid target. Do this by creating a new compound stmt with the
// label in it.
// Give the label a sub-statement.
L->setSubStmt(new (Context) NullStmt(L->getIdentLoc()));
CompoundStmt *Compound = isa<CXXTryStmt>(Body) ?
cast<CXXTryStmt>(Body)->getTryBlock() :
cast<CompoundStmt>(Body);
llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(),
Compound->body_end());
Elements.push_back(L);
Compound->setStmts(Context, Elements.data(), Elements.size());
}
Start of checking for gotos which jump to an illegal destination. As far as I know, this catches all cases of jumping into the scope of a variable with a variably modified type (excluding statement expressions) in C. This is missing some stuff we probably want to check (other kinds of variably modified declarations, statement expressions, indirect gotos/addresses of labels in a scope, ObjC @try/@finally, cleanup attribute), the diagnostics aren't very good, and it's not particularly efficient, but it's a decent start. This patch is a slightly modified version of the patch I attached to PR3259, and it fixes that bug. I was sort of planning on improving it, but I think it's okay as-is, especially since it looks like CodeGen doesn't have any use for this sort of data structure. The only significant change I can think of from the version I attached to PR3259 is that this version skips running the checking code when a function doesn't contain any labels. This patch doesn't cover case statements, which also need similar checking; I'm not sure how we should deal with that. Extending the goto checking to also check case statements wouldn't be too hard; it's just a matter of keeping track of the scope of the closest switch and checking that the scope of every case is the same as the scope of the switch. That said, it would likely be a performance hit to run this check on every function (it's an extra pass over the entire function), so we probably want some other solution. llvm-svn: 65678
2009-02-28 13:41:13 +08:00
if (Body) {
// C++ constructors that have function-try-blocks can't have return
// statements in the handlers of that block. (C++ [except.handle]p14)
// Verify this.
if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
// Verify that that gotos and switch cases don't jump into scopes illegally.
// Verify that that gotos and switch cases don't jump into scopes illegally.
if (FunctionNeedsScopeChecking() && !hasAnyErrorsInThisFunction())
DiagnoseInvalidJumps(Body);
if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl))
MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
Destructor->getParent());
// If any errors have occurred, clear out any temporaries that may have
// been leftover. This ensures that these temporaries won't be picked up for
// deletion in some later function.
if (PP.getDiagnostics().hasErrorOccurred())
ExprTemporaries.clear();
else if (!isa<FunctionTemplateDecl>(dcl)) {
// Since the body is valid, issue any analysis-based warnings that are
// enabled.
QualType ResultType;
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) {
ResultType = FD->getResultType();
}
else {
ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl);
ResultType = MD->getResultType();
}
AnalysisWarnings.IssueWarnings(WP, dcl);
}
assert(ExprTemporaries.empty() && "Leftover temporaries in function");
}
if (!IsInstantiation)
PopDeclContext();
PopFunctionOrBlockScope();
2009-11-14 03:21:49 +08:00
// If any errors have occurred, clear out any temporaries that may have
// been leftover. This ensures that these temporaries won't be picked up for
// deletion in some later function.
if (getDiagnostics().hasErrorOccurred())
ExprTemporaries.clear();
return D;
}
/// ImplicitlyDefineFunction - An undeclared identifier was used in a function
/// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
IdentifierInfo &II, Scope *S) {
// Before we produce a declaration for an implicitly defined
// function, see whether there was a locally-scoped declaration of
// this name as a function or variable. If so, use that
// (non-visible) declaration, and complain about it.
llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
= LocallyScopedExternalDecls.find(&II);
if (Pos != LocallyScopedExternalDecls.end()) {
Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second;
Diag(Pos->second->getLocation(), diag::note_previous_declaration);
return Pos->second;
}
// Extension in C99. Legal in C90, but warn about it.
if (II.getName().startswith("__builtin_"))
Diag(Loc, diag::warn_builtin_unknown) << &II;
else if (getLangOptions().C99)
Diag(Loc, diag::ext_implicit_function_decl) << &II;
else
Diag(Loc, diag::warn_implicit_function_decl) << &II;
// Set a Declarator for the implicit definition: int foo();
const char *Dummy;
DeclSpec DS;
unsigned DiagID;
bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID);
Error = Error; // Silence warning.
assert(!Error && "Error setting up implicit decl!");
Declarator D(DS, Declarator::BlockContext);
D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0,
0, 0, false, SourceLocation(),
false, 0,0,0, Loc, Loc, D),
SourceLocation());
D.SetIdentifier(&II, Loc);
// Insert this function into translation-unit scope.
DeclContext *PrevDC = CurContext;
CurContext = Context.getTranslationUnitDecl();
FunctionDecl *FD =
dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>());
FD->setImplicit();
CurContext = PrevDC;
AddKnownFunctionAttributes(FD);
return FD;
}
/// \brief Adds any function attributes that we know a priori based on
/// the declaration of this function.
///
/// These attributes can apply both to implicitly-declared builtins
/// (like __builtin___printf_chk) or to library-declared functions
/// like NSLog or printf.
void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
if (FD->isInvalidDecl())
return;
// If this is a built-in function, map its builtin attributes to
// actual attributes.
if (unsigned BuiltinID = FD->getBuiltinID()) {
// Handle printf-formatting attributes.
unsigned FormatIdx;
bool HasVAListArg;
if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
if (!FD->getAttr<FormatAttr>())
FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1,
HasVAListArg ? 0 : FormatIdx+2));
}
// Mark const if we don't care about errno and that is the only
// thing preventing the function from being const. This allows
// IRgen to use LLVM intrinsics for such functions.
if (!getLangOptions().MathErrno &&
Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
if (!FD->getAttr<ConstAttr>())
FD->addAttr(::new (Context) ConstAttr());
}
2009-07-28 03:14:18 +08:00
if (Context.BuiltinInfo.isNoReturn(BuiltinID))
FD->setType(Context.getNoReturnType(FD->getType()));
if (Context.BuiltinInfo.isNoThrow(BuiltinID))
FD->addAttr(::new (Context) NoThrowAttr());
if (Context.BuiltinInfo.isConst(BuiltinID))
FD->addAttr(::new (Context) ConstAttr());
}
IdentifierInfo *Name = FD->getIdentifier();
if (!Name)
return;
if ((!getLangOptions().CPlusPlus &&
FD->getDeclContext()->isTranslationUnit()) ||
(isa<LinkageSpecDecl>(FD->getDeclContext()) &&
cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
LinkageSpecDecl::lang_c)) {
// Okay: this could be a libc/libm/Objective-C function we know
// about.
} else
return;
if (Name->isStr("NSLog") || Name->isStr("NSLogv")) {
// FIXME: NSLog and NSLogv should be target specific
if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) {
// FIXME: We known better than our headers.
const_cast<FormatAttr *>(Format)->setType(Context, "printf");
} else
FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1,
Name->isStr("NSLogv") ? 0 : 2));
} else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
// FIXME: asprintf and vasprintf aren't C99 functions. Should they be
// target-specific builtins, perhaps?
if (!FD->getAttr<FormatAttr>())
FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2,
Name->isStr("vasprintf") ? 0 : 3));
}
}
TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
TypeSourceInfo *TInfo) {
assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
if (!TInfo) {
assert(D.isInvalidType() && "no declarator info for valid type");
TInfo = Context.getTrivialTypeSourceInfo(T);
}
// Scope manipulation handled by caller.
TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
D.getIdentifierLoc(),
D.getIdentifier(),
TInfo);
if (const TagType *TT = T->getAs<TagType>()) {
TagDecl *TD = TT->getDecl();
// If the TagDecl that the TypedefDecl points to is an anonymous decl
// keep track of the TypedefDecl.
if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl())
TD->setTypedefForAnonDecl(NewTD);
}
if (D.isInvalidType())
NewTD->setInvalidDecl();
return NewTD;
}
/// \brief Determine whether a tag with a given kind is acceptable
/// as a redeclaration of the given tag declaration.
///
/// \returns true if the new tag kind is acceptable, false otherwise.
bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
TagDecl::TagKind NewTag,
SourceLocation NewTagLoc,
const IdentifierInfo &Name) {
// C++ [dcl.type.elab]p3:
// The class-key or enum keyword present in the
// elaborated-type-specifier shall agree in kind with the
// declaration to which the name in theelaborated-type-specifier
// refers. This rule also applies to the form of
// elaborated-type-specifier that declares a class-name or
// friend class since it can be construed as referring to the
// definition of the class. Thus, in any
// elaborated-type-specifier, the enum keyword shall be used to
// refer to an enumeration (7.2), the union class-keyshall be
// used to refer to a union (clause 9), and either the class or
// struct class-key shall be used to refer to a class (clause 9)
// declared using the class or struct class-key.
TagDecl::TagKind OldTag = Previous->getTagKind();
if (OldTag == NewTag)
return true;
if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) &&
(NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) {
// Warn about the struct/class tag mismatch.
bool isTemplate = false;
if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
isTemplate = Record->getDescribedClassTemplate();
Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
<< (NewTag == TagDecl::TK_class)
<< isTemplate << &Name
<< FixItHint::CreateReplacement(SourceRange(NewTagLoc),
OldTag == TagDecl::TK_class? "class" : "struct");
Diag(Previous->getLocation(), diag::note_previous_use);
return true;
}
return false;
}
/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the
/// former case, Name will be non-null. In the later case, Name will be null.
/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
/// reference/declaration/definition of a tag.
Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
SourceLocation KWLoc, CXXScopeSpec &SS,
IdentifierInfo *Name, SourceLocation NameLoc,
AttributeList *Attr, AccessSpecifier AS,
MultiTemplateParamsArg TemplateParameterLists,
bool &OwnedDecl, bool &IsDependent) {
// If this is not a definition, it must have a name.
assert((Name != 0 || TUK == TUK_Definition) &&
"Nameless record must be a definition!");
OwnedDecl = false;
TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec);
// FIXME: Check explicit specializations more carefully.
bool isExplicitSpecialization = false;
if (TUK != TUK_Reference) {
if (TemplateParameterList *TemplateParams
= MatchTemplateParametersToScopeSpecifier(KWLoc, SS,
(TemplateParameterList**)TemplateParameterLists.get(),
TemplateParameterLists.size(),
isExplicitSpecialization)) {
if (TemplateParams->size() > 0) {
// This is a declaration or definition of a class template (which may
// be a member of another template).
OwnedDecl = false;
DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
SS, Name, NameLoc, Attr,
TemplateParams,
AS);
TemplateParameterLists.release();
return Result.get();
} else {
// The "template<>" header is extraneous.
Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
<< ElaboratedType::getNameForTagKind(Kind) << Name;
isExplicitSpecialization = true;
}
}
TemplateParameterLists.release();
}
DeclContext *SearchDC = CurContext;
DeclContext *DC = CurContext;
bool isStdBadAlloc = false;
bool Invalid = false;
RedeclarationKind Redecl = ForRedeclaration;
if (TUK == TUK_Friend || TUK == TUK_Reference)
Redecl = NotForRedeclaration;
LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
if (Name && SS.isNotEmpty()) {
// We have a nested-name tag ('struct foo::bar').
// Check for invalid 'foo::'.
if (SS.isInvalid()) {
Name = 0;
goto CreateNewDecl;
}
// If this is a friend or a reference to a class in a dependent
// context, don't try to make a decl for it.
if (TUK == TUK_Friend || TUK == TUK_Reference) {
DC = computeDeclContext(SS, false);
if (!DC) {
IsDependent = true;
return DeclPtrTy();
}
}
if (RequireCompleteDeclContext(SS))
return DeclPtrTy::make((Decl *)0);
DC = computeDeclContext(SS, true);
SearchDC = DC;
// Look-up name inside 'foo::'.
LookupQualifiedName(Previous, DC);
if (Previous.isAmbiguous())
return DeclPtrTy();
if (Previous.empty()) {
// Name lookup did not find anything. However, if the
// nested-name-specifier refers to the current instantiation,
// and that current instantiation has any dependent base
// classes, we might find something at instantiation time: treat
// this as a dependent elaborated-type-specifier.
if (Previous.wasNotFoundInCurrentInstantiation()) {
IsDependent = true;
return DeclPtrTy();
}
// A tag 'foo::bar' must already exist.
Diag(NameLoc, diag::err_not_tag_in_scope)
<< Kind << Name << DC << SS.getRange();
Name = 0;
Invalid = true;
goto CreateNewDecl;
}
} else if (Name) {
// If this is a named struct, check to see if there was a previous forward
// declaration or definition.
// FIXME: We're looking into outer scopes here, even when we
// shouldn't be. Doing so can result in ambiguities that we
// shouldn't be diagnosing.
LookupName(Previous, S);
// Note: there used to be some attempt at recovery here.
if (Previous.isAmbiguous())
return DeclPtrTy();
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) {
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
// FIXME: This makes sure that we ignore the contexts associated
// with C structs, unions, and enums when looking for a matching
// tag declaration or definition. See the similar lookup tweak
// in Sema::LookupName; is there a better way to deal with this?
while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
SearchDC = SearchDC->getParent();
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
}
}
if (Previous.isSingleResult() &&
Previous.getFoundDecl()->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
// Just pretend that we didn't see the previous declaration.
Previous.clear();
}
if (getLangOptions().CPlusPlus && Name && DC && StdNamespace &&
DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) {
// This is a declaration of or a reference to "std::bad_alloc".
isStdBadAlloc = true;
if (Previous.empty() && StdBadAlloc) {
// std::bad_alloc has been implicitly declared (but made invisible to
// name lookup). Fill in this implicit declaration as the previous
// declaration, so that the declarations get chained appropriately.
Previous.addDecl(StdBadAlloc);
}
}
// If we didn't find a previous declaration, and this is a reference
// (or friend reference), move to the correct scope. In C++, we
// also need to do a redeclaration lookup there, just in case
// there's a shadow friend decl.
if (Name && Previous.empty() &&
(TUK == TUK_Reference || TUK == TUK_Friend)) {
if (Invalid) goto CreateNewDecl;
assert(SS.isEmpty());
if (TUK == TUK_Reference) {
// C++ [basic.scope.pdecl]p5:
// -- for an elaborated-type-specifier of the form
//
// class-key identifier
//
// if the elaborated-type-specifier is used in the
// decl-specifier-seq or parameter-declaration-clause of a
// function defined in namespace scope, the identifier is
// declared as a class-name in the namespace that contains
// the declaration; otherwise, except as a friend
// declaration, the identifier is declared in the smallest
// non-class, non-function-prototype scope that contains the
// declaration.
//
// C99 6.7.2.3p8 has a similar (but not identical!) provision for
// C structs and unions.
//
// It is an error in C++ to declare (rather than define) an enum
// type, including via an elaborated type specifier. We'll
// diagnose that later; for now, declare the enum in the same
// scope as we would have picked for any other tag type.
//
// GNU C also supports this behavior as part of its incomplete
// enum types extension, while GNU C++ does not.
//
// Find the context where we'll be declaring the tag.
// FIXME: We would like to maintain the current DeclContext as the
// lexical context,
while (SearchDC->isRecord())
SearchDC = SearchDC->getParent();
// Find the scope where we'll be declaring the tag.
while (S->isClassScope() ||
(getLangOptions().CPlusPlus &&
S->isFunctionPrototypeScope()) ||
((S->getFlags() & Scope::DeclScope) == 0) ||
(S->getEntity() &&
((DeclContext *)S->getEntity())->isTransparentContext()))
S = S->getParent();
} else {
assert(TUK == TUK_Friend);
// C++ [namespace.memdef]p3:
// If a friend declaration in a non-local class first declares a
// class or function, the friend class or function is a member of
// the innermost enclosing namespace.
SearchDC = SearchDC->getEnclosingNamespaceContext();
// Look up through our scopes until we find one with an entity which
// matches our declaration context.
while (S->getEntity() &&
((DeclContext *)S->getEntity())->getPrimaryContext() != SearchDC) {
S = S->getParent();
assert(S && "No enclosing scope matching the enclosing namespace.");
}
}
// In C++, look for a shadow friend decl.
if (getLangOptions().CPlusPlus) {
Previous.setRedeclarationKind(ForRedeclaration);
LookupQualifiedName(Previous, SearchDC);
}
}
if (!Previous.empty()) {
assert(Previous.isSingleResult());
NamedDecl *PrevDecl = Previous.getFoundDecl();
if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
// If this is a use of a previous tag, or if the tag is already declared
// in the same scope (so that the definition/declaration completes or
// rementions the tag), reuse the decl.
if (TUK == TUK_Reference || TUK == TUK_Friend ||
isDeclInScope(PrevDecl, SearchDC, S)) {
// Make sure that this wasn't declared as an enum and now used as a
// struct or something similar.
if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) {
bool SafeToContinue
= (PrevTagDecl->getTagKind() != TagDecl::TK_enum &&
Kind != TagDecl::TK_enum);
if (SafeToContinue)
Diag(KWLoc, diag::err_use_with_wrong_tag)
<< Name
<< FixItHint::CreateReplacement(SourceRange(KWLoc),
PrevTagDecl->getKindName());
else
Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
if (SafeToContinue)
Kind = PrevTagDecl->getTagKind();
else {
// Recover by making this an anonymous redefinition.
Name = 0;
Previous.clear();
Invalid = true;
}
}
if (!Invalid) {
// If this is a use, just return the declaration we found.
// FIXME: In the future, return a variant or some other clue
// for the consumer of this Decl to know it doesn't own it.
// For our current ASTs this shouldn't be a problem, but will
// need to be changed with DeclGroups.
if (TUK == TUK_Reference || TUK == TUK_Friend)
return DeclPtrTy::make(PrevTagDecl);
// Diagnose attempts to redefine a tag.
if (TUK == TUK_Definition) {
if (TagDecl *Def = PrevTagDecl->getDefinition()) {
// If we're defining a specialization and the previous definition
// is from an implicit instantiation, don't emit an error
// here; we'll catch this in the general case below.
if (!isExplicitSpecialization ||
!isa<CXXRecordDecl>(Def) ||
cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind()
== TSK_ExplicitSpecialization) {
Diag(NameLoc, diag::err_redefinition) << Name;
Diag(Def->getLocation(), diag::note_previous_definition);
// If this is a redefinition, recover by making this
// struct be anonymous, which will make any later
// references get the previous definition.
Name = 0;
Previous.clear();
Invalid = true;
}
} else {
// If the type is currently being defined, complain
// about a nested redefinition.
TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl));
if (Tag->isBeingDefined()) {
Diag(NameLoc, diag::err_nested_redefinition) << Name;
Diag(PrevTagDecl->getLocation(),
diag::note_previous_definition);
Name = 0;
Previous.clear();
Invalid = true;
}
}
// Okay, this is definition of a previously declared or referenced
// tag PrevDecl. We're going to create a new Decl for it.
}
}
// If we get here we have (another) forward declaration or we
// have a definition. Just create a new decl.
} else {
// If we get here, this is a definition of a new tag type in a nested
// scope, e.g. "struct foo; void bar() { struct foo; }", just create a
// new decl/type. We set PrevDecl to NULL so that the entities
// have distinct types.
Previous.clear();
}
// If we get here, we're going to create a new Decl. If PrevDecl
// is non-NULL, it's a definition of the tag declared by
// PrevDecl. If it's NULL, we have a new definition.
} else {
// PrevDecl is a namespace, template, or anything else
// that lives in the IDNS_Tag identifier namespace.
if (TUK == TUK_Reference || TUK == TUK_Friend ||
isDeclInScope(PrevDecl, SearchDC, S)) {
2008-09-04 02:03:35 +08:00
// The tag name clashes with a namespace name, issue an error and
// recover by making this tag be anonymous.
Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Name = 0;
Previous.clear();
Invalid = true;
} else {
// The existing declaration isn't relevant to us; we're in a
// new scope, so clear out the previous declaration.
Previous.clear();
}
}
}
CreateNewDecl:
TagDecl *PrevDecl = 0;
if (Previous.isSingleResult())
PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
// If there is an identifier, use the location of the identifier as the
// location of the decl, otherwise use the location of the struct/union
// keyword.
SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
// Otherwise, create a new declaration. If there is a previous
// declaration of the same entity, the two will be linked via
// PrevDecl.
TagDecl *New;
if (Kind == TagDecl::TK_enum) {
// FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
// enum X { A, B, C } D; D should chain to X.
New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc,
cast_or_null<EnumDecl>(PrevDecl));
// If this is an undefined enum, warn.
if (TUK != TUK_Definition && !Invalid) {
unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum
: diag::ext_forward_ref_enum;
Diag(Loc, DK);
}
} else {
// struct/union/class
// FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
// struct X { int A; } D; D should chain to X.
if (getLangOptions().CPlusPlus) {
// FIXME: Look for a way to use RecordDecl for simple structs.
New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc,
cast_or_null<CXXRecordDecl>(PrevDecl));
if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit()))
StdBadAlloc = cast<CXXRecordDecl>(New);
} else
New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc,
cast_or_null<RecordDecl>(PrevDecl));
}
// Maybe add qualifier info.
if (SS.isNotEmpty()) {
NestedNameSpecifier *NNS
= static_cast<NestedNameSpecifier*>(SS.getScopeRep());
New->setQualifierInfo(NNS, SS.getRange());
}
if (Kind != TagDecl::TK_enum) {
// Handle #pragma pack: if the #pragma pack stack has non-default
// alignment, make up a packed attribute for this decl. These
// attributes are checked when the ASTContext lays out the
// structure.
//
// It is important for implementing the correct semantics that this
// happen here (in act on tag decl). The #pragma pack stack is
// maintained as a result of parser callbacks which can occur at
// many points during the parsing of a struct declaration (because
// the #pragma tokens are effectively skipped over during the
// parsing of the struct).
if (unsigned Alignment = getPragmaPackAlignment())
New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8));
}
if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) {
// C++ [dcl.typedef]p3:
// [...] Similarly, in a given scope, a class or enumeration
// shall not be declared with the same name as a typedef-name
// that is declared in that scope and refers to a type other
// than the class or enumeration itself.
LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName,
ForRedeclaration);
LookupName(Lookup, S);
TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>();
NamedDecl *PrevTypedefNamed = PrevTypedef;
if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) &&
Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) !=
Context.getCanonicalType(Context.getTypeDeclType(New))) {
Diag(Loc, diag::err_tag_definition_of_typedef)
<< Context.getTypeDeclType(New)
<< PrevTypedef->getUnderlyingType();
Diag(PrevTypedef->getLocation(), diag::note_previous_definition);
Invalid = true;
}
}
// If this is a specialization of a member class (of a class template),
// check the specialization.
if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
Invalid = true;
if (Invalid)
New->setInvalidDecl();
if (Attr)
ProcessDeclAttributeList(S, New, Attr);
// If we're declaring or defining a tag in function prototype scope
// in C, note that this type can only be used within the function.
if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus)
Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
// Set the lexical context. If the tag has a C++ scope specifier, the
// lexical context will be different from the semantic context.
New->setLexicalDeclContext(CurContext);
// Mark this as a friend decl if applicable.
if (TUK == TUK_Friend)
New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty());
// Set the access specifier.
if (!Invalid && SearchDC->isRecord())
SetMemberAccessSpecifier(New, PrevDecl, AS);
if (TUK == TUK_Definition)
New->startDefinition();
Change struct forward declarations and definitions to use unique RecordDecls, as opposed to creating a single RecordDecl and reusing it. This change effects both RecordDecls and CXXRecordDecls, but does not effect EnumDecls (yet). The motivation of this patch is as follows: - Capture more source information, necessary for refactoring/rewriting clients. - Pave the way to resolve ownership issues with RecordDecls with the forthcoming addition of DeclGroups. Current caveats: - Until DeclGroups are in place, we will leak RecordDecls not explicitly referenced by the AST. For example: typedef struct { ... } x; The RecordDecl for the struct will be leaked because the TypedefDecl doesn't refer to it. This will be solved with DeclGroups. - This patch also (temporarily) breaks CodeGen. More below. High-level changes: - As before, TagType still refers to a TagDecl, but it doesn't own it. When a struct/union/class is first referenced, a RecordType and RecordDecl are created for it, and the RecordType refers to that RecordDecl. Later, if a new RecordDecl is created, the pointer to a RecordDecl in RecordType is updated to point to the RecordDecl that defines the struct/union/class. - TagDecl and RecordDecl now how a method 'getDefinition()' to return the TagDecl*/RecordDecl* that refers to the TagDecl* that defines a particular enum/struct/class/union. This is useful from going from a RecordDecl* that defines a forward declaration to the RecordDecl* that provides the actual definition. Note that this also works for EnumDecls, except that in this case there is no distinction between forward declarations and definitions (yet). - Clients should no longer assume that 'isDefinition()' returns true from a RecordDecl if the corresponding struct/union/class has been defined. isDefinition() only returns true if a particular RecordDecl is the defining Decl. Use 'getDefinition()' instead to determine if a struct has been defined. - The main changes to Sema happen in ActOnTag. To make the changes more incremental, I split off the processing of enums and structs et al into two code paths. Enums use the original code path (which is in ActOnTag) and structs use the ActOnTagStruct. Eventually the two code paths will be merged, but the idea was to preserve the original logic both for comparison and not to change the logic for both enums and structs all at once. - There is NO CHAINING of RecordDecls for the same RecordType. All RecordDecls that correspond to the same type simply have a pointer to that type. If we need to figure out what are all the RecordDecls for a given type we can build a backmap. - The diff in CXXRecordDecl.[cpp,h] is actually very small; it just mimics the changes to RecordDecl. For some reason 'svn' marks the entire file as changed. Why is CodeGen broken: - Codegen assumes that there is an equivalence between RecordDecl* and RecordType*. This was true before because we only created one RecordDecl* for a given RecordType*, but it is no longer true. I believe this shouldn't be too hard to change, but the patch was big enough as it is. I have tested this patch on both the clang test suite, and by running the static analyzer over Postgresql and a large Apple-internal project (mix of Objective-C and C). llvm-svn: 55839
2008-09-06 01:16:31 +08:00
// If this has an identifier, add it to the scope stack.
if (TUK == TUK_Friend) {
// We might be replacing an existing declaration in the lookup tables;
// if so, borrow its access specifier.
if (PrevDecl)
New->setAccess(PrevDecl->getAccess());
DeclContext *DC = New->getDeclContext()->getLookupContext();
DC->makeDeclVisibleInContext(New, /* Recoverable = */ false);
if (Name) // can be null along some error paths
if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
} else if (Name) {
S = getNonFieldDeclScope(S);
PushOnScopeChains(New, S);
} else {
CurContext->addDecl(New);
Change struct forward declarations and definitions to use unique RecordDecls, as opposed to creating a single RecordDecl and reusing it. This change effects both RecordDecls and CXXRecordDecls, but does not effect EnumDecls (yet). The motivation of this patch is as follows: - Capture more source information, necessary for refactoring/rewriting clients. - Pave the way to resolve ownership issues with RecordDecls with the forthcoming addition of DeclGroups. Current caveats: - Until DeclGroups are in place, we will leak RecordDecls not explicitly referenced by the AST. For example: typedef struct { ... } x; The RecordDecl for the struct will be leaked because the TypedefDecl doesn't refer to it. This will be solved with DeclGroups. - This patch also (temporarily) breaks CodeGen. More below. High-level changes: - As before, TagType still refers to a TagDecl, but it doesn't own it. When a struct/union/class is first referenced, a RecordType and RecordDecl are created for it, and the RecordType refers to that RecordDecl. Later, if a new RecordDecl is created, the pointer to a RecordDecl in RecordType is updated to point to the RecordDecl that defines the struct/union/class. - TagDecl and RecordDecl now how a method 'getDefinition()' to return the TagDecl*/RecordDecl* that refers to the TagDecl* that defines a particular enum/struct/class/union. This is useful from going from a RecordDecl* that defines a forward declaration to the RecordDecl* that provides the actual definition. Note that this also works for EnumDecls, except that in this case there is no distinction between forward declarations and definitions (yet). - Clients should no longer assume that 'isDefinition()' returns true from a RecordDecl if the corresponding struct/union/class has been defined. isDefinition() only returns true if a particular RecordDecl is the defining Decl. Use 'getDefinition()' instead to determine if a struct has been defined. - The main changes to Sema happen in ActOnTag. To make the changes more incremental, I split off the processing of enums and structs et al into two code paths. Enums use the original code path (which is in ActOnTag) and structs use the ActOnTagStruct. Eventually the two code paths will be merged, but the idea was to preserve the original logic both for comparison and not to change the logic for both enums and structs all at once. - There is NO CHAINING of RecordDecls for the same RecordType. All RecordDecls that correspond to the same type simply have a pointer to that type. If we need to figure out what are all the RecordDecls for a given type we can build a backmap. - The diff in CXXRecordDecl.[cpp,h] is actually very small; it just mimics the changes to RecordDecl. For some reason 'svn' marks the entire file as changed. Why is CodeGen broken: - Codegen assumes that there is an equivalence between RecordDecl* and RecordType*. This was true before because we only created one RecordDecl* for a given RecordType*, but it is no longer true. I believe this shouldn't be too hard to change, but the patch was big enough as it is. I have tested this patch on both the clang test suite, and by running the static analyzer over Postgresql and a large Apple-internal project (mix of Objective-C and C). llvm-svn: 55839
2008-09-06 01:16:31 +08:00
}
// If this is the C FILE type, notify the AST context.
if (IdentifierInfo *II = New->getIdentifier())
if (!New->isInvalidDecl() &&
New->getDeclContext()->getLookupContext()->isTranslationUnit() &&
II->isStr("FILE"))
Context.setFILEDecl(New);
OwnedDecl = true;
return DeclPtrTy::make(New);
Change struct forward declarations and definitions to use unique RecordDecls, as opposed to creating a single RecordDecl and reusing it. This change effects both RecordDecls and CXXRecordDecls, but does not effect EnumDecls (yet). The motivation of this patch is as follows: - Capture more source information, necessary for refactoring/rewriting clients. - Pave the way to resolve ownership issues with RecordDecls with the forthcoming addition of DeclGroups. Current caveats: - Until DeclGroups are in place, we will leak RecordDecls not explicitly referenced by the AST. For example: typedef struct { ... } x; The RecordDecl for the struct will be leaked because the TypedefDecl doesn't refer to it. This will be solved with DeclGroups. - This patch also (temporarily) breaks CodeGen. More below. High-level changes: - As before, TagType still refers to a TagDecl, but it doesn't own it. When a struct/union/class is first referenced, a RecordType and RecordDecl are created for it, and the RecordType refers to that RecordDecl. Later, if a new RecordDecl is created, the pointer to a RecordDecl in RecordType is updated to point to the RecordDecl that defines the struct/union/class. - TagDecl and RecordDecl now how a method 'getDefinition()' to return the TagDecl*/RecordDecl* that refers to the TagDecl* that defines a particular enum/struct/class/union. This is useful from going from a RecordDecl* that defines a forward declaration to the RecordDecl* that provides the actual definition. Note that this also works for EnumDecls, except that in this case there is no distinction between forward declarations and definitions (yet). - Clients should no longer assume that 'isDefinition()' returns true from a RecordDecl if the corresponding struct/union/class has been defined. isDefinition() only returns true if a particular RecordDecl is the defining Decl. Use 'getDefinition()' instead to determine if a struct has been defined. - The main changes to Sema happen in ActOnTag. To make the changes more incremental, I split off the processing of enums and structs et al into two code paths. Enums use the original code path (which is in ActOnTag) and structs use the ActOnTagStruct. Eventually the two code paths will be merged, but the idea was to preserve the original logic both for comparison and not to change the logic for both enums and structs all at once. - There is NO CHAINING of RecordDecls for the same RecordType. All RecordDecls that correspond to the same type simply have a pointer to that type. If we need to figure out what are all the RecordDecls for a given type we can build a backmap. - The diff in CXXRecordDecl.[cpp,h] is actually very small; it just mimics the changes to RecordDecl. For some reason 'svn' marks the entire file as changed. Why is CodeGen broken: - Codegen assumes that there is an equivalence between RecordDecl* and RecordType*. This was true before because we only created one RecordDecl* for a given RecordType*, but it is no longer true. I believe this shouldn't be too hard to change, but the patch was big enough as it is. I have tested this patch on both the clang test suite, and by running the static analyzer over Postgresql and a large Apple-internal project (mix of Objective-C and C). llvm-svn: 55839
2008-09-06 01:16:31 +08:00
}
void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) {
AdjustDeclIfTemplate(TagD);
TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>());
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
// Enter the tag context.
PushDeclContext(S, Tag);
}
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD,
SourceLocation LBraceLoc) {
AdjustDeclIfTemplate(TagD);
CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>());
FieldCollector->StartClass();
if (!Record->getIdentifier())
return;
// C++ [class]p2:
// [...] The class-name is also inserted into the scope of the
// class itself; this is known as the injected-class-name. For
// purposes of access checking, the injected-class-name is treated
// as if it were a public member name.
CXXRecordDecl *InjectedClassName
= CXXRecordDecl::Create(Context, Record->getTagKind(),
CurContext, Record->getLocation(),
Record->getIdentifier(),
Record->getTagKeywordLoc(),
Record);
InjectedClassName->setImplicit();
InjectedClassName->setAccess(AS_public);
if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
InjectedClassName->setDescribedClassTemplate(Template);
PushOnScopeChains(InjectedClassName, S);
assert(InjectedClassName->isInjectedClassName() &&
"Broken injected-class-name");
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
}
// Traverses the class and any nested classes, making a note of any
// dynamic classes that have no key function so that we can mark all of
// their virtual member functions as "used" at the end of the translation
// unit. This ensures that all functions needed by the vtable will get
// instantiated/synthesized.
static void
RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record,
SourceLocation Loc) {
// We don't look at dependent or undefined classes.
if (Record->isDependentContext() || !Record->isDefinition())
return;
if (Record->isDynamicClass()) {
const CXXMethodDecl *KeyFunction = S.Context.getKeyFunction(Record);
if (!KeyFunction)
S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record,
Loc));
if ((!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined()))
&& Record->getLinkage() == ExternalLinkage)
S.Diag(Record->getLocation(), diag::warn_weak_vtable) << Record;
}
for (DeclContext::decl_iterator D = Record->decls_begin(),
DEnd = Record->decls_end();
D != DEnd; ++D) {
if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D))
RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc);
}
}
void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD,
SourceLocation RBraceLoc) {
AdjustDeclIfTemplate(TagD);
TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>());
Tag->setRBraceLoc(RBraceLoc);
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
if (isa<CXXRecordDecl>(Tag))
FieldCollector->FinishClass();
// Exit this scope of this tag's definition.
PopDeclContext();
if (isa<CXXRecordDecl>(Tag) && !Tag->getLexicalDeclContext()->isRecord())
RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag),
RBraceLoc);
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
// Notify the consumer that we've defined a tag.
Consumer.HandleTagDeclDefinition(Tag);
}
void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) {
AdjustDeclIfTemplate(TagD);
TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>());
Tag->setInvalidDecl();
// We're undoing ActOnTagStartDefinition here, not
// ActOnStartCXXMemberDeclarations, so we don't have to mess with
// the FieldCollector.
PopDeclContext();
}
// Note that FieldName may be null for anonymous bitfields.
bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName,
QualType FieldTy, const Expr *BitWidth,
bool *ZeroWidth) {
// Default to true; that shouldn't confuse checks for emptiness
if (ZeroWidth)
*ZeroWidth = true;
// C99 6.7.2.1p4 - verify the field type.
// C++ 9.6p3: A bit-field shall have integral or enumeration type.
if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) {
// Handle incomplete types with specific error.
if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
return true;
if (FieldName)
return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
<< FieldName << FieldTy << BitWidth->getSourceRange();
return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
<< FieldTy << BitWidth->getSourceRange();
}
// If the bit-width is type- or value-dependent, don't try to check
// it now.
if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
return false;
llvm::APSInt Value;
if (VerifyIntegerConstantExpression(BitWidth, &Value))
return true;
if (Value != 0 && ZeroWidth)
*ZeroWidth = false;
// Zero-width bitfield is ok for anonymous field.
if (Value == 0 && FieldName)
return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
if (Value.isSigned() && Value.isNegative()) {
if (FieldName)
return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
<< FieldName << Value.toString(10);
return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
<< Value.toString(10);
}
if (!FieldTy->isDependentType()) {
uint64_t TypeSize = Context.getTypeSize(FieldTy);
if (Value.getZExtValue() > TypeSize) {
if (FieldName)
return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size)
<< FieldName << (unsigned)TypeSize;
return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size)
<< (unsigned)TypeSize;
}
}
return false;
}
/// ActOnField - Each field of a struct/union/class is passed into this in order
/// to create a FieldDecl object for it.
Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD,
SourceLocation DeclStart,
Declarator &D, ExprTy *BitfieldWidth) {
FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()),
DeclStart, D, static_cast<Expr*>(BitfieldWidth),
AS_public);
return DeclPtrTy::make(Res);
}
/// HandleField - Analyze a field of a C struct or a C++ data member.
///
FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
SourceLocation DeclStart,
Declarator &D, Expr *BitWidth,
AccessSpecifier AS) {
IdentifierInfo *II = D.getIdentifier();
SourceLocation Loc = DeclStart;
if (II) Loc = D.getIdentifierLoc();
TypeSourceInfo *TInfo = 0;
QualType T = GetTypeForDeclarator(D, S, &TInfo);
if (getLangOptions().CPlusPlus)
CheckExtraCXXDefaultArguments(D);
DiagnoseFunctionSpecifiers(D);
if (D.getDeclSpec().isThreadSpecified())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName,
ForRedeclaration);
if (PrevDecl && PrevDecl->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
// Just pretend that we didn't see the previous declaration.
PrevDecl = 0;
}
if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
PrevDecl = 0;
bool Mutable
= (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
SourceLocation TSSL = D.getSourceRange().getBegin();
FieldDecl *NewFD
= CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL,
AS, PrevDecl, &D);
if (NewFD->isInvalidDecl())
Record->setInvalidDecl();
if (NewFD->isInvalidDecl() && PrevDecl) {
// Don't introduce NewFD into scope; there's already something
// with the same name in the same scope.
} else if (II) {
PushOnScopeChains(NewFD, S);
} else
Record->addDecl(NewFD);
return NewFD;
}
/// \brief Build a new FieldDecl and check its well-formedness.
///
/// This routine builds a new FieldDecl given the fields name, type,
/// record, etc. \p PrevDecl should refer to any previous declaration
/// with the same name and in the same scope as the field to be
/// created.
///
/// \returns a new FieldDecl.
///
/// \todo The Declarator argument is a hack. It will be removed once
FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
TypeSourceInfo *TInfo,
RecordDecl *Record, SourceLocation Loc,
bool Mutable, Expr *BitWidth,
SourceLocation TSSL,
AccessSpecifier AS, NamedDecl *PrevDecl,
Declarator *D) {
IdentifierInfo *II = Name.getAsIdentifierInfo();
bool InvalidDecl = false;
if (D) InvalidDecl = D->isInvalidType();
// If we receive a broken type, recover by assuming 'int' and
// marking this declaration as invalid.
if (T.isNull()) {
InvalidDecl = true;
T = Context.IntTy;
}
QualType EltTy = Context.getBaseElementType(T);
if (!EltTy->isDependentType() &&
RequireCompleteType(Loc, EltTy, diag::err_field_incomplete))
InvalidDecl = true;
// C99 6.7.2.1p8: A member of a structure or union may have any type other
// than a variably modified type.
if (!InvalidDecl && T->isVariablyModifiedType()) {
bool SizeIsNegative;
QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context,
SizeIsNegative);
if (!FixedTy.isNull()) {
Diag(Loc, diag::warn_illegal_constant_array_size);
T = FixedTy;
} else {
if (SizeIsNegative)
Diag(Loc, diag::err_typecheck_negative_array_size);
else
Diag(Loc, diag::err_typecheck_field_variable_size);
InvalidDecl = true;
}
}
// Fields can not have abstract class types
if (!InvalidDecl && RequireNonAbstractType(Loc, T,
diag::err_abstract_type_in_decl,
AbstractFieldType))
InvalidDecl = true;
bool ZeroWidth = false;
// If this is declared as a bit-field, check the bit-field.
if (!InvalidDecl && BitWidth &&
VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) {
InvalidDecl = true;
DeleteExpr(BitWidth);
BitWidth = 0;
ZeroWidth = false;
}
FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo,
BitWidth, Mutable);
if (InvalidDecl)
NewFD->setInvalidDecl();
if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
Diag(Loc, diag::err_duplicate_member) << II;
Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
NewFD->setInvalidDecl();
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
}
if (!InvalidDecl && getLangOptions().CPlusPlus) {
CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record);
if (!T->isPODType())
CXXRecord->setPOD(false);
if (!ZeroWidth)
CXXRecord->setEmpty(false);
if (const RecordType *RT = EltTy->getAs<RecordType>()) {
CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
if (!RDecl->hasTrivialConstructor())
CXXRecord->setHasTrivialConstructor(false);
if (!RDecl->hasTrivialCopyConstructor())
CXXRecord->setHasTrivialCopyConstructor(false);
if (!RDecl->hasTrivialCopyAssignment())
CXXRecord->setHasTrivialCopyAssignment(false);
if (!RDecl->hasTrivialDestructor())
CXXRecord->setHasTrivialDestructor(false);
// C++ 9.5p1: An object of a class with a non-trivial
// constructor, a non-trivial copy constructor, a non-trivial
// destructor, or a non-trivial copy assignment operator
// cannot be a member of a union, nor can an array of such
// objects.
// TODO: C++0x alters this restriction significantly.
if (Record->isUnion()) {
// We check for copy constructors before constructors
// because otherwise we'll never get complaints about
// copy constructors.
const CXXSpecialMember invalid = (CXXSpecialMember) -1;
CXXSpecialMember member;
if (!RDecl->hasTrivialCopyConstructor())
member = CXXCopyConstructor;
else if (!RDecl->hasTrivialConstructor())
member = CXXDefaultConstructor;
else if (!RDecl->hasTrivialCopyAssignment())
member = CXXCopyAssignment;
else if (!RDecl->hasTrivialDestructor())
member = CXXDestructor;
else
member = invalid;
if (member != invalid) {
Diag(Loc, diag::err_illegal_union_member) << Name << member;
DiagnoseNontrivial(RT, member);
NewFD->setInvalidDecl();
}
}
}
}
// FIXME: We need to pass in the attributes given an AST
// representation, not a parser representation.
if (D)
// FIXME: What to pass instead of TUScope?
ProcessDeclAttributes(TUScope, NewFD, *D);
if (T.isObjCGCWeak())
Diag(Loc, diag::warn_attribute_weak_on_field);
NewFD->setAccess(AS);
// C++ [dcl.init.aggr]p1:
// An aggregate is an array or a class (clause 9) with [...] no
// private or protected non-static data members (clause 11).
// A POD must be an aggregate.
if (getLangOptions().CPlusPlus &&
(AS == AS_private || AS == AS_protected)) {
CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record);
CXXRecord->setAggregate(false);
CXXRecord->setPOD(false);
}
return NewFD;
}
/// DiagnoseNontrivial - Given that a class has a non-trivial
/// special member, figure out why.
void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) {
QualType QT(T, 0U);
CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl());
// Check whether the member was user-declared.
switch (member) {
case CXXDefaultConstructor:
if (RD->hasUserDeclaredConstructor()) {
typedef CXXRecordDecl::ctor_iterator ctor_iter;
for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){
const FunctionDecl *body = 0;
ci->getBody(body);
if (!body ||
!cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) {
SourceLocation CtorLoc = ci->getLocation();
Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
return;
}
}
assert(0 && "found no user-declared constructors");
return;
}
break;
case CXXCopyConstructor:
if (RD->hasUserDeclaredCopyConstructor()) {
SourceLocation CtorLoc =
RD->getCopyConstructor(Context, 0)->getLocation();
Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
return;
}
break;
case CXXCopyAssignment:
if (RD->hasUserDeclaredCopyAssignment()) {
// FIXME: this should use the location of the copy
// assignment, not the type.
SourceLocation TyLoc = RD->getSourceRange().getBegin();
Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member;
return;
}
break;
case CXXDestructor:
if (RD->hasUserDeclaredDestructor()) {
SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation();
Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member;
return;
}
break;
}
typedef CXXRecordDecl::base_class_iterator base_iter;
// Virtual bases and members inhibit trivial copying/construction,
// but not trivial destruction.
if (member != CXXDestructor) {
// Check for virtual bases. vbases includes indirect virtual bases,
// so we just iterate through the direct bases.
for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi)
if (bi->isVirtual()) {
SourceLocation BaseLoc = bi->getSourceRange().getBegin();
Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1;
return;
}
// Check for virtual methods.
typedef CXXRecordDecl::method_iterator meth_iter;
for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me;
++mi) {
if (mi->isVirtual()) {
SourceLocation MLoc = mi->getSourceRange().getBegin();
Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0;
return;
}
}
}
bool (CXXRecordDecl::*hasTrivial)() const;
switch (member) {
case CXXDefaultConstructor:
hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break;
case CXXCopyConstructor:
hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break;
case CXXCopyAssignment:
hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break;
case CXXDestructor:
hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break;
default:
assert(0 && "unexpected special member"); return;
}
// Check for nontrivial bases (and recurse).
for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) {
const RecordType *BaseRT = bi->getType()->getAs<RecordType>();
assert(BaseRT && "Don't know how to handle dependent bases");
CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl());
if (!(BaseRecTy->*hasTrivial)()) {
SourceLocation BaseLoc = bi->getSourceRange().getBegin();
Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member;
DiagnoseNontrivial(BaseRT, member);
return;
}
}
// Check for nontrivial members (and recurse).
typedef RecordDecl::field_iterator field_iter;
for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe;
++fi) {
QualType EltTy = Context.getBaseElementType((*fi)->getType());
if (const RecordType *EltRT = EltTy->getAs<RecordType>()) {
CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl());
if (!(EltRD->*hasTrivial)()) {
SourceLocation FLoc = (*fi)->getLocation();
Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member;
DiagnoseNontrivial(EltRT, member);
return;
}
}
}
assert(0 && "found no explanation for non-trivial member");
}
/// TranslateIvarVisibility - Translate visibility from a token ID to an
/// AST enum value.
static ObjCIvarDecl::AccessControl
TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
switch (ivarVisibility) {
default: assert(0 && "Unknown visitibility kind");
case tok::objc_private: return ObjCIvarDecl::Private;
case tok::objc_public: return ObjCIvarDecl::Public;
case tok::objc_protected: return ObjCIvarDecl::Protected;
case tok::objc_package: return ObjCIvarDecl::Package;
}
}
/// ActOnIvar - Each ivar field of an objective-c class is passed into this
/// in order to create an IvarDecl object for it.
Sema::DeclPtrTy Sema::ActOnIvar(Scope *S,
SourceLocation DeclStart,
DeclPtrTy IntfDecl,
Declarator &D, ExprTy *BitfieldWidth,
tok::ObjCKeywordKind Visibility) {
IdentifierInfo *II = D.getIdentifier();
Expr *BitWidth = (Expr*)BitfieldWidth;
SourceLocation Loc = DeclStart;
if (II) Loc = D.getIdentifierLoc();
// FIXME: Unnamed fields can be handled in various different ways, for
// example, unnamed unions inject all members into the struct namespace!
TypeSourceInfo *TInfo = 0;
QualType T = GetTypeForDeclarator(D, S, &TInfo);
if (BitWidth) {
// 6.7.2.1p3, 6.7.2.1p4
if (VerifyBitField(Loc, II, T, BitWidth)) {
D.setInvalidType();
DeleteExpr(BitWidth);
BitWidth = 0;
}
} else {
// Not a bitfield.
// validate II.
}
// C99 6.7.2.1p8: A member of a structure or union may have any type other
// than a variably modified type.
if (T->isVariablyModifiedType()) {
Diag(Loc, diag::err_typecheck_ivar_variable_size);
D.setInvalidType();
}
// Get the visibility (access control) for this ivar.
ObjCIvarDecl::AccessControl ac =
Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
: ObjCIvarDecl::None;
// Must set ivar's DeclContext to its enclosing interface.
ObjCContainerDecl *EnclosingDecl = IntfDecl.getAs<ObjCContainerDecl>();
ObjCContainerDecl *EnclosingContext;
if (ObjCImplementationDecl *IMPDecl =
dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
// Case of ivar declared in an implementation. Context is that of its class.
EnclosingContext = IMPDecl->getClassInterface();
assert(EnclosingContext && "Implementation has no class interface!");
} else {
if (ObjCCategoryDecl *CDecl =
dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) {
Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
return DeclPtrTy();
}
}
EnclosingContext = EnclosingDecl;
}
// Construct the decl.
ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context,
EnclosingContext, Loc, II, T,
TInfo, ac, (Expr *)BitfieldWidth);
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
if (II) {
NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName,
ForRedeclaration);
if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
&& !isa<TagDecl>(PrevDecl)) {
Diag(Loc, diag::err_duplicate_member) << II;
Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
NewID->setInvalidDecl();
}
}
// Process attributes attached to the ivar.
ProcessDeclAttributes(S, NewID, D);
if (D.isInvalidType())
NewID->setInvalidDecl();
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
if (II) {
// FIXME: When interfaces are DeclContexts, we'll need to add
// these to the interface.
S->AddDecl(DeclPtrTy::make(NewID));
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
IdResolver.AddDecl(NewID);
}
return DeclPtrTy::make(NewID);
}
void Sema::ActOnFields(Scope* S,
SourceLocation RecLoc, DeclPtrTy RecDecl,
DeclPtrTy *Fields, unsigned NumFields,
SourceLocation LBrac, SourceLocation RBrac,
AttributeList *Attr) {
Decl *EnclosingDecl = RecDecl.getAs<Decl>();
assert(EnclosingDecl && "missing record or interface decl");
// If the decl this is being inserted into is invalid, then it may be a
// redeclaration or some other bogus case. Don't try to add fields to it.
if (EnclosingDecl->isInvalidDecl()) {
// FIXME: Deallocate fields?
return;
}
// Verify that all the fields are okay.
unsigned NumNamedMembers = 0;
llvm::SmallVector<FieldDecl*, 32> RecFields;
RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
for (unsigned i = 0; i != NumFields; ++i) {
FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>());
// Get the type for the field.
Type *FDTy = FD->getType().getTypePtr();
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
if (!FD->isAnonymousStructOrUnion()) {
// Remember all fields written by the user.
RecFields.push_back(FD);
}
// If the field is already invalid for some reason, don't emit more
// diagnostics about it.
if (FD->isInvalidDecl()) {
EnclosingDecl->setInvalidDecl();
continue;
}
// C99 6.7.2.1p2:
// A structure or union shall not contain a member with
// incomplete or function type (hence, a structure shall not
// contain an instance of itself, but may contain a pointer to
// an instance of itself), except that the last member of a
// structure with more than one named member may have incomplete
// array type; such a structure (and any union containing,
// possibly recursively, a member that is such a structure)
// shall not be a member of a structure or an element of an
// array.
if (FDTy->isFunctionType()) {
// Field declared as a function.
Diag(FD->getLocation(), diag::err_field_declared_as_function)
<< FD->getDeclName();
FD->setInvalidDecl();
EnclosingDecl->setInvalidDecl();
continue;
} else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 &&
Record && Record->isStruct()) {
// Flexible array member.
if (NumNamedMembers < 1) {
Diag(FD->getLocation(), diag::err_flexible_array_empty_struct)
<< FD->getDeclName();
FD->setInvalidDecl();
EnclosingDecl->setInvalidDecl();
continue;
}
// Okay, we have a legal flexible array member at the end of the struct.
if (Record)
Record->setHasFlexibleArrayMember(true);
} else if (!FDTy->isDependentType() &&
RequireCompleteType(FD->getLocation(), FD->getType(),
diag::err_field_incomplete)) {
// Incomplete type
FD->setInvalidDecl();
EnclosingDecl->setInvalidDecl();
continue;
} else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
if (FDTTy->getDecl()->hasFlexibleArrayMember()) {
// If this is a member of a union, then entire union becomes "flexible".
if (Record && Record->isUnion()) {
Record->setHasFlexibleArrayMember(true);
} else {
// If this is a struct/class and this is not the last element, reject
// it. Note that GCC supports variable sized arrays in the middle of
// structures.
if (i != NumFields-1)
Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
<< FD->getDeclName() << FD->getType();
else {
// We support flexible arrays at the end of structs in
// other structs as an extension.
Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
<< FD->getDeclName();
if (Record)
Record->setHasFlexibleArrayMember(true);
}
}
}
if (Record && FDTTy->getDecl()->hasObjectMember())
Record->setHasObjectMember(true);
} else if (FDTy->isObjCInterfaceType()) {
/// A field cannot be an Objective-c object
Diag(FD->getLocation(), diag::err_statically_allocated_object);
FD->setInvalidDecl();
EnclosingDecl->setInvalidDecl();
continue;
2009-08-05 05:02:39 +08:00
} else if (getLangOptions().ObjC1 &&
getLangOptions().getGCMode() != LangOptions::NonGC &&
Record &&
(FD->getType()->isObjCObjectPointerType() ||
FD->getType().isObjCGCStrong()))
Record->setHasObjectMember(true);
// Keep track of the number of named members.
Unify the code for defining tags in C and C++, so that we always introduce a Scope for the body of a tag. This reduces the number of semantic differences between C and C++ structs and unions, and will help with other features (e.g., anonymous unions) in C. Some important points: - Fields are now in the "member" namespace (IDNS_Member), to keep them separate from tags and ordinary names in C. See the new test in Sema/member-reference.c for an example of why this matters. In C++, ordinary and member name lookup will find members in both the ordinary and member namespace, so the difference between IDNS_Member and IDNS_Ordinary is erased by Sema::LookupDecl (but only in C++!). - We always introduce a Scope and push a DeclContext when we're defining a tag, in both C and C++. Previously, we had different actions and different Scope/CurContext behavior for enums, C structs/unions, and C++ structs/unions/classes. Now, it's one pair of actions. (Yay!) There's still some fuzziness in the handling of struct/union/enum definitions within other struct/union/enum definitions in C. We'll need to do some more cleanup to eliminate some reliance on CurContext before we can solve this issue for real. What we want is for something like this: struct X { struct T { int x; } t; }; to introduce T into translation unit scope (placing it at the appropriate point in the IdentifierResolver chain, too), but it should still have struct X as its lexical declaration context. PushOnScopeChains isn't smart enough to do that yet, though, so there's a FIXME test in nested-redef.c llvm-svn: 61940
2009-01-09 04:45:30 +08:00
if (FD->getIdentifier())
++NumNamedMembers;
}
// Okay, we successfully defined 'Record'.
if (Record) {
Record->completeDefinition();
} else {
ObjCIvarDecl **ClsFields =
reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
ID->setLocEnd(RBrac);
// Add ivar's to class's DeclContext.
for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
ClsFields[i]->setLexicalDeclContext(ID);
ID->addDecl(ClsFields[i]);
}
// Must enforce the rule that ivars in the base classes may not be
// duplicates.
if (ID->getSuperClass())
DiagnoseDuplicateIvars(ID, ID->getSuperClass());
} else if (ObjCImplementationDecl *IMPDecl =
dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
// Ivar declared in @implementation never belongs to the implementation.
// Only it is in implementation's lexical context.
ClsFields[I]->setLexicalDeclContext(IMPDecl);
CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
} else if (ObjCCategoryDecl *CDecl =
dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
// case of ivars in class extension; all other cases have been
// reported as errors elsewhere.
// FIXME. Class extension does not have a LocEnd field.
// CDecl->setLocEnd(RBrac);
// Add ivar's to class extension's DeclContext.
for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
ClsFields[i]->setLexicalDeclContext(CDecl);
CDecl->addDecl(ClsFields[i]);
}
}
}
if (Attr)
ProcessDeclAttributeList(S, Record, Attr);
}
/// \brief Determine whether the given integral value is representable within
/// the given type T.
static bool isRepresentableIntegerValue(ASTContext &Context,
llvm::APSInt &Value,
QualType T) {
assert(T->isIntegralType() && "Integral type required!");
unsigned BitWidth = Context.getTypeSize(T);
if (Value.isUnsigned() || Value.isNonNegative())
return Value.getActiveBits() < BitWidth;
return Value.getMinSignedBits() <= BitWidth;
}
// \brief Given an integral type, return the next larger integral type
// (or a NULL type of no such type exists).
static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
// FIXME: Int128/UInt128 support, which also needs to be introduced into
// enum checking below.
assert(T->isIntegralType() && "Integral type required!");
const unsigned NumTypes = 4;
QualType SignedIntegralTypes[NumTypes] = {
Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
};
QualType UnsignedIntegralTypes[NumTypes] = {
Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
Context.UnsignedLongLongTy
};
unsigned BitWidth = Context.getTypeSize(T);
QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes
: UnsignedIntegralTypes;
for (unsigned I = 0; I != NumTypes; ++I)
if (Context.getTypeSize(Types[I]) > BitWidth)
return Types[I];
return QualType();
}
EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
EnumConstantDecl *LastEnumConst,
SourceLocation IdLoc,
IdentifierInfo *Id,
ExprArg val) {
Expr *Val = (Expr *)val.get();
unsigned IntWidth = Context.Target.getIntWidth();
llvm::APSInt EnumVal(IntWidth);
QualType EltTy;
if (Val) {
if (Enum->isDependentType() || Val->isTypeDependent())
EltTy = Context.DependentTy;
else {
// C99 6.7.2.2p2: Make sure we have an integer constant expression.
SourceLocation ExpLoc;
if (!Val->isValueDependent() &&
VerifyIntegerConstantExpression(Val, &EnumVal)) {
Val = 0;
} else {
if (!getLangOptions().CPlusPlus) {
// C99 6.7.2.2p2:
// The expression that defines the value of an enumeration constant
// shall be an integer constant expression that has a value
// representable as an int.
// Complain if the value is not representable in an int.
if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
Diag(IdLoc, diag::ext_enum_value_not_int)
<< EnumVal.toString(10) << Val->getSourceRange()
<< (EnumVal.isUnsigned() || EnumVal.isNonNegative());
else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
// Force the type of the expression to 'int'.
ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast);
if (Val != val.get()) {
val.release();
val = Val;
}
}
}
// C++0x [dcl.enum]p5:
// If the underlying type is not fixed, the type of each enumerator
// is the type of its initializing value:
// - If an initializer is specified for an enumerator, the
// initializing value has the same type as the expression.
EltTy = Val->getType();
}
}
}
if (!Val) {
if (Enum->isDependentType())
EltTy = Context.DependentTy;
else if (!LastEnumConst) {
// C++0x [dcl.enum]p5:
// If the underlying type is not fixed, the type of each enumerator
// is the type of its initializing value:
// - If no initializer is specified for the first enumerator, the
// initializing value has an unspecified integral type.
//
// GCC uses 'int' for its unspecified integral type, as does
// C99 6.7.2.2p3.
EltTy = Context.IntTy;
} else {
// Assign the last value + 1.
EnumVal = LastEnumConst->getInitVal();
++EnumVal;
EltTy = LastEnumConst->getType();
// Check for overflow on increment.
if (EnumVal < LastEnumConst->getInitVal()) {
// C++0x [dcl.enum]p5:
// If the underlying type is not fixed, the type of each enumerator
// is the type of its initializing value:
//
// - Otherwise the type of the initializing value is the same as
// the type of the initializing value of the preceding enumerator
// unless the incremented value is not representable in that type,
// in which case the type is an unspecified integral type
// sufficient to contain the incremented value. If no such type
// exists, the program is ill-formed.
QualType T = getNextLargerIntegralType(Context, EltTy);
if (T.isNull()) {
// There is no integral type larger enough to represent this
// value. Complain, then allow the value to wrap around.
EnumVal = LastEnumConst->getInitVal();
EnumVal.zext(EnumVal.getBitWidth() * 2);
Diag(IdLoc, diag::warn_enumerator_too_large)
<< EnumVal.toString(10);
} else {
EltTy = T;
}
// Retrieve the last enumerator's value, extent that type to the
// type that is supposed to be large enough to represent the incremented
// value, then increment.
EnumVal = LastEnumConst->getInitVal();
EnumVal.setIsSigned(EltTy->isSignedIntegerType());
EnumVal.zextOrTrunc(Context.getTypeSize(EltTy));
++EnumVal;
// If we're not in C++, diagnose the overflow of enumerator values,
// which in C99 means that the enumerator value is not representable in
// an int (C99 6.7.2.2p2). However, we support GCC's extension that
// permits enumerator values that are representable in some larger
// integral type.
if (!getLangOptions().CPlusPlus && !T.isNull())
Diag(IdLoc, diag::warn_enum_value_overflow);
} else if (!getLangOptions().CPlusPlus &&
!isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
// Enforce C99 6.7.2.2p2 even when we compute the next value.
Diag(IdLoc, diag::ext_enum_value_not_int)
<< EnumVal.toString(10) << 1;
}
}
}
if (!EltTy->isDependentType()) {
// Make the enumerator value match the signedness and size of the
// enumerator's type.
EnumVal.zextOrTrunc(Context.getTypeSize(EltTy));
EnumVal.setIsSigned(EltTy->isSignedIntegerType());
}
val.release();
return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
Val, EnumVal);
}
Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl,
DeclPtrTy lastEnumConst,
SourceLocation IdLoc,
IdentifierInfo *Id,
SourceLocation EqualLoc, ExprTy *val) {
EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>());
EnumConstantDecl *LastEnumConst =
cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>());
Expr *Val = static_cast<Expr*>(val);
// The scope passed in may not be a decl scope. Zip up the scope tree until
// we find one that is.
S = getNonFieldDeclScope(S);
// Verify that there isn't already something declared with this name in this
// scope.
NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName,
ForRedeclaration);
if (PrevDecl && PrevDecl->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
// Just pretend that we didn't see the previous declaration.
PrevDecl = 0;
}
if (PrevDecl) {
// When in C++, we may get a TagDecl with the same name; in this case the
// enum constant will 'hide' the tag.
assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
"Received TagDecl when not in C++!");
if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) {
if (isa<EnumConstantDecl>(PrevDecl))
Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
else
Diag(IdLoc, diag::err_redefinition) << Id;
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
if (Val) Val->Destroy(Context);
return DeclPtrTy();
}
}
EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst,
IdLoc, Id, Owned(Val));
// Register this decl in the current scope stack.
if (New) {
New->setAccess(TheEnumDecl->getAccess());
PushOnScopeChains(New, S);
}
return DeclPtrTy::make(New);
}
void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
SourceLocation RBraceLoc, DeclPtrTy EnumDeclX,
DeclPtrTy *Elements, unsigned NumElements,
Scope *S, AttributeList *Attr) {
EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>());
QualType EnumType = Context.getTypeDeclType(Enum);
if (Attr)
ProcessDeclAttributeList(S, Enum, Attr);
if (Enum->isDependentType()) {
for (unsigned i = 0; i != NumElements; ++i) {
EnumConstantDecl *ECD =
cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>());
if (!ECD) continue;
ECD->setType(EnumType);
}
Enum->completeDefinition(Context.DependentTy, Context.DependentTy);
return;
}
2007-08-28 13:10:31 +08:00
// TODO: If the result value doesn't fit in an int, it must be a long or long
// long value. ISO C does not support this, but GCC does as an extension,
// emit a warning.
unsigned IntWidth = Context.Target.getIntWidth();
unsigned CharWidth = Context.Target.getCharWidth();
unsigned ShortWidth = Context.Target.getShortWidth();
// Verify that all the values are okay, compute the size of the values, and
// reverse the list.
unsigned NumNegativeBits = 0;
unsigned NumPositiveBits = 0;
// Keep track of whether all elements have type int.
bool AllElementsInt = true;
for (unsigned i = 0; i != NumElements; ++i) {
EnumConstantDecl *ECD =
cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>());
if (!ECD) continue; // Already issued a diagnostic.
const llvm::APSInt &InitVal = ECD->getInitVal();
// Keep track of the size of positive and negative values.
if (InitVal.isUnsigned() || InitVal.isNonNegative())
NumPositiveBits = std::max(NumPositiveBits,
(unsigned)InitVal.getActiveBits());
else
NumNegativeBits = std::max(NumNegativeBits,
(unsigned)InitVal.getMinSignedBits());
// Keep track of whether every enum element has type int (very commmon).
if (AllElementsInt)
AllElementsInt = ECD->getType() == Context.IntTy;
}
// Figure out the type that should be used for this enum.
// FIXME: Support -fshort-enums.
QualType BestType;
unsigned BestWidth;
// C++0x N3000 [conv.prom]p3:
// An rvalue of an unscoped enumeration type whose underlying
// type is not fixed can be converted to an rvalue of the first
// of the following types that can represent all the values of
// the enumeration: int, unsigned int, long int, unsigned long
// int, long long int, or unsigned long long int.
// C99 6.4.4.3p2:
// An identifier declared as an enumeration constant has type int.
// The C99 rule is modified by a gcc extension
QualType BestPromotionType;
bool Packed = Enum->getAttr<PackedAttr>() ? true : false;
if (NumNegativeBits) {
// If there is a negative value, figure out the smallest integer type (of
// int/long/longlong) that fits.
// If it's packed, check also if it fits a char or a short.
if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
BestType = Context.SignedCharTy;
BestWidth = CharWidth;
} else if (Packed && NumNegativeBits <= ShortWidth &&
NumPositiveBits < ShortWidth) {
BestType = Context.ShortTy;
BestWidth = ShortWidth;
} else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
BestType = Context.IntTy;
BestWidth = IntWidth;
} else {
BestWidth = Context.Target.getLongWidth();
if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
BestType = Context.LongTy;
} else {
BestWidth = Context.Target.getLongLongWidth();
if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
Diag(Enum->getLocation(), diag::warn_enum_too_large);
BestType = Context.LongLongTy;
}
}
BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
} else {
// If there is no negative value, figure out the smallest type that fits
// all of the enumerator values.
// If it's packed, check also if it fits a char or a short.
if (Packed && NumPositiveBits <= CharWidth) {
BestType = Context.UnsignedCharTy;
BestPromotionType = Context.IntTy;
BestWidth = CharWidth;
} else if (Packed && NumPositiveBits <= ShortWidth) {
BestType = Context.UnsignedShortTy;
BestPromotionType = Context.IntTy;
BestWidth = ShortWidth;
} else if (NumPositiveBits <= IntWidth) {
BestType = Context.UnsignedIntTy;
BestWidth = IntWidth;
BestPromotionType
= (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
? Context.UnsignedIntTy : Context.IntTy;
} else if (NumPositiveBits <=
(BestWidth = Context.Target.getLongWidth())) {
BestType = Context.UnsignedLongTy;
BestPromotionType
= (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
? Context.UnsignedLongTy : Context.LongTy;
} else {
BestWidth = Context.Target.getLongLongWidth();
assert(NumPositiveBits <= BestWidth &&
"How could an initializer get larger than ULL?");
BestType = Context.UnsignedLongLongTy;
BestPromotionType
= (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
? Context.UnsignedLongLongTy : Context.LongLongTy;
}
}
// Loop over all of the enumerator constants, changing their types to match
// the type of the enum if needed.
for (unsigned i = 0; i != NumElements; ++i) {
EnumConstantDecl *ECD =
cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>());
if (!ECD) continue; // Already issued a diagnostic.
// Standard C says the enumerators have int type, but we allow, as an
// extension, the enumerators to be larger than int size. If each
// enumerator value fits in an int, type it as an int, otherwise type it the
// same as the enumerator decl itself. This means that in "enum { X = 1U }"
// that X has type 'int', not 'unsigned'.
// Determine whether the value fits into an int.
llvm::APSInt InitVal = ECD->getInitVal();
// If it fits into an integer type, force it. Otherwise force it to match
// the enum decl type.
QualType NewTy;
unsigned NewWidth;
bool NewSign;
if (!getLangOptions().CPlusPlus &&
isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
NewTy = Context.IntTy;
NewWidth = IntWidth;
NewSign = true;
} else if (ECD->getType() == BestType) {
// Already the right type!
if (getLangOptions().CPlusPlus)
// C++ [dcl.enum]p4: Following the closing brace of an
// enum-specifier, each enumerator has the type of its
// enumeration.
ECD->setType(EnumType);
continue;
} else {
NewTy = BestType;
NewWidth = BestWidth;
NewSign = BestType->isSignedIntegerType();
}
// Adjust the APSInt value.
InitVal.extOrTrunc(NewWidth);
InitVal.setIsSigned(NewSign);
ECD->setInitVal(InitVal);
// Adjust the Expr initializer and type.
if (ECD->getInitExpr())
ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy,
CastExpr::CK_IntegralCast,
ECD->getInitExpr(),
/*isLvalue=*/false));
if (getLangOptions().CPlusPlus)
// C++ [dcl.enum]p4: Following the closing brace of an
// enum-specifier, each enumerator has the type of its
// enumeration.
ECD->setType(EnumType);
else
ECD->setType(NewTy);
}
Enum->completeDefinition(BestType, BestPromotionType);
}
Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc,
ExprArg expr) {
StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>());
FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
Loc, AsmString);
CurContext->addDecl(New);
return DeclPtrTy::make(New);
}
void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
SourceLocation PragmaLoc,
SourceLocation NameLoc) {
Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName);
if (PrevDecl) {
PrevDecl->addAttr(::new (Context) WeakAttr());
} else {
(void)WeakUndeclaredIdentifiers.insert(
std::pair<IdentifierInfo*,WeakInfo>
(Name, WeakInfo((IdentifierInfo*)0, NameLoc)));
}
}
void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
IdentifierInfo* AliasName,
SourceLocation PragmaLoc,
SourceLocation NameLoc,
SourceLocation AliasNameLoc) {
Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName);
WeakInfo W = WeakInfo(Name, NameLoc);
if (PrevDecl) {
if (!PrevDecl->hasAttr<AliasAttr>())
if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
DeclApplyPragmaWeak(TUScope, ND, W);
} else {
(void)WeakUndeclaredIdentifiers.insert(
std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));
}
}