maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/clang/lib/Sema/SemaDeclCXX.cpp

2270 lines
92 KiB
C++
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ 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 C++ declarations.
//
//===----------------------------------------------------------------------===//
#include "Sema.h"
#include "SemaInherit.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/TypeOrdering.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Parse/DeclSpec.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Compiler.h"
#include <algorithm> // for std::equal
#include <map>
using namespace clang;
//===----------------------------------------------------------------------===//
// CheckDefaultArgumentVisitor
//===----------------------------------------------------------------------===//
namespace {
/// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
/// the default argument of a parameter to determine whether it
/// contains any ill-formed subexpressions. For example, this will
/// diagnose the use of local variables or parameters within the
/// default argument expression.
class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor
: public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
Expr *DefaultArg;
Sema *S;
public:
CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
: DefaultArg(defarg), S(s) {}
bool VisitExpr(Expr *Node);
bool VisitDeclRefExpr(DeclRefExpr *DRE);
bool VisitCXXThisExpr(CXXThisExpr *ThisE);
};
/// VisitExpr - Visit all of the children of this expression.
bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
bool IsInvalid = false;
for (Stmt::child_iterator I = Node->child_begin(),
E = Node->child_end(); I != E; ++I)
IsInvalid |= Visit(*I);
return IsInvalid;
}
/// VisitDeclRefExpr - Visit a reference to a declaration, to
/// determine whether this declaration can be used in the default
/// argument expression.
bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
NamedDecl *Decl = DRE->getDecl();
if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
// C++ [dcl.fct.default]p9
// Default arguments are evaluated each time the function is
// called. The order of evaluation of function arguments is
// unspecified. Consequently, parameters of a function shall not
// be used in default argument expressions, even if they are not
// evaluated. Parameters of a function declared before a default
// argument expression are in scope and can hide namespace and
// class member names.
return S->Diag(DRE->getSourceRange().getBegin(),
diag::err_param_default_argument_references_param)
<< Param->getDeclName() << DefaultArg->getSourceRange();
} else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
// C++ [dcl.fct.default]p7
// Local variables shall not be used in default argument
// expressions.
if (VDecl->isBlockVarDecl())
return S->Diag(DRE->getSourceRange().getBegin(),
diag::err_param_default_argument_references_local)
<< VDecl->getDeclName() << DefaultArg->getSourceRange();
}
return false;
}
/// VisitCXXThisExpr - Visit a C++ "this" expression.
bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
// C++ [dcl.fct.default]p8:
// The keyword this shall not be used in a default argument of a
// member function.
return S->Diag(ThisE->getSourceRange().getBegin(),
diag::err_param_default_argument_references_this)
<< ThisE->getSourceRange();
}
}
/// ActOnParamDefaultArgument - Check whether the default argument
/// provided for a function parameter is well-formed. If so, attach it
/// to the parameter declaration.
void
Sema::ActOnParamDefaultArgument(DeclTy *param, SourceLocation EqualLoc,
ExprArg defarg) {
ParmVarDecl *Param = (ParmVarDecl *)param;
ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg.release());
QualType ParamType = Param->getType();
// Default arguments are only permitted in C++
if (!getLangOptions().CPlusPlus) {
Diag(EqualLoc, diag::err_param_default_argument)
<< DefaultArg->getSourceRange();
Param->setInvalidDecl();
return;
}
// C++ [dcl.fct.default]p5
// A default argument expression is implicitly converted (clause
// 4) to the parameter type. The default argument expression has
// the same semantic constraints as the initializer expression in
// a declaration of a variable of the parameter type, using the
// copy-initialization semantics (8.5).
Expr *DefaultArgPtr = DefaultArg.get();
bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType,
EqualLoc,
Param->getDeclName(),
/*DirectInit=*/false);
if (DefaultArgPtr != DefaultArg.get()) {
DefaultArg.take();
DefaultArg.reset(DefaultArgPtr);
}
if (DefaultInitFailed) {
return;
}
// Check that the default argument is well-formed
CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this);
if (DefaultArgChecker.Visit(DefaultArg.get())) {
Param->setInvalidDecl();
return;
}
// Okay: add the default argument to the parameter
Param->setDefaultArg(DefaultArg.take());
}
/// ActOnParamUnparsedDefaultArgument - We've seen a default
/// argument for a function parameter, but we can't parse it yet
/// because we're inside a class definition. Note that this default
/// argument will be parsed later.
void Sema::ActOnParamUnparsedDefaultArgument(DeclTy *param,
SourceLocation EqualLoc) {
ParmVarDecl *Param = (ParmVarDecl*)param;
if (Param)
Param->setUnparsedDefaultArg();
}
/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
/// the default argument for the parameter param failed.
void Sema::ActOnParamDefaultArgumentError(DeclTy *param) {
((ParmVarDecl*)param)->setInvalidDecl();
}
/// CheckExtraCXXDefaultArguments - Check for any extra default
/// arguments in the declarator, which is not a function declaration
/// or definition and therefore is not permitted to have default
/// arguments. This routine should be invoked for every declarator
/// that is not a function declaration or definition.
void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
// C++ [dcl.fct.default]p3
// A default argument expression shall be specified only in the
// parameter-declaration-clause of a function declaration or in a
// template-parameter (14.1). It shall not be specified for a
// parameter pack. If it is specified in a
// parameter-declaration-clause, it shall not occur within a
// declarator or abstract-declarator of a parameter-declaration.
for (unsigned i = 0; i < D.getNumTypeObjects(); ++i) {
DeclaratorChunk &chunk = D.getTypeObject(i);
if (chunk.Kind == DeclaratorChunk::Function) {
for (unsigned argIdx = 0; argIdx < chunk.Fun.NumArgs; ++argIdx) {
ParmVarDecl *Param = (ParmVarDecl *)chunk.Fun.ArgInfo[argIdx].Param;
if (Param->hasUnparsedDefaultArg()) {
CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens;
Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
<< SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation());
delete Toks;
chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0;
} else if (Param->getDefaultArg()) {
Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
<< Param->getDefaultArg()->getSourceRange();
Param->setDefaultArg(0);
}
}
}
}
}
// MergeCXXFunctionDecl - Merge two declarations of the same C++
// function, once we already know that they have the same
// type. Subroutine of MergeFunctionDecl. Returns true if there was an
// error, false otherwise.
bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) {
bool Invalid = false;
// C++ [dcl.fct.default]p4:
//
// For non-template functions, default arguments can be added in
// later declarations of a function in the same
// scope. Declarations in different scopes have completely
// distinct sets of default arguments. That is, declarations in
// inner scopes do not acquire default arguments from
// declarations in outer scopes, and vice versa. In a given
// function declaration, all parameters subsequent to a
// parameter with a default argument shall have default
// arguments supplied in this or previous declarations. A
// default argument shall not be redefined by a later
// declaration (not even to the same value).
for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) {
ParmVarDecl *OldParam = Old->getParamDecl(p);
ParmVarDecl *NewParam = New->getParamDecl(p);
if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) {
Diag(NewParam->getLocation(),
diag::err_param_default_argument_redefinition)
<< NewParam->getDefaultArg()->getSourceRange();
Diag(OldParam->getLocation(), diag::note_previous_definition);
Invalid = true;
} else if (OldParam->getDefaultArg()) {
// Merge the old default argument into the new parameter
NewParam->setDefaultArg(OldParam->getDefaultArg());
}
}
return Invalid;
}
/// CheckCXXDefaultArguments - Verify that the default arguments for a
/// function declaration are well-formed according to C++
/// [dcl.fct.default].
void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
unsigned NumParams = FD->getNumParams();
unsigned p;
// Find first parameter with a default argument
for (p = 0; p < NumParams; ++p) {
ParmVarDecl *Param = FD->getParamDecl(p);
if (Param->getDefaultArg())
break;
}
// C++ [dcl.fct.default]p4:
// In a given function declaration, all parameters
// subsequent to a parameter with a default argument shall
// have default arguments supplied in this or previous
// declarations. A default argument shall not be redefined
// by a later declaration (not even to the same value).
unsigned LastMissingDefaultArg = 0;
for(; p < NumParams; ++p) {
ParmVarDecl *Param = FD->getParamDecl(p);
if (!Param->getDefaultArg()) {
if (Param->isInvalidDecl())
/* We already complained about this parameter. */;
else if (Param->getIdentifier())
Diag(Param->getLocation(),
diag::err_param_default_argument_missing_name)
<< Param->getIdentifier();
else
Diag(Param->getLocation(),
diag::err_param_default_argument_missing);
LastMissingDefaultArg = p;
}
}
if (LastMissingDefaultArg > 0) {
// Some default arguments were missing. Clear out all of the
// default arguments up to (and including) the last missing
// default argument, so that we leave the function parameters
// in a semantically valid state.
for (p = 0; p <= LastMissingDefaultArg; ++p) {
ParmVarDecl *Param = FD->getParamDecl(p);
if (Param->getDefaultArg()) {
if (!Param->hasUnparsedDefaultArg())
Param->getDefaultArg()->Destroy(Context);
Param->setDefaultArg(0);
}
}
}
}
/// isCurrentClassName - Determine whether the identifier II is the
/// name of the class type currently being defined. In the case of
/// nested classes, this will only return true if II is the name of
/// the innermost class.
bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
const CXXScopeSpec *SS) {
CXXRecordDecl *CurDecl;
if (SS) {
DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep());
CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
} else
CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
if (CurDecl)
return &II == CurDecl->getIdentifier();
else
return false;
}
/// \brief Check the validity of a C++ base class specifier.
///
/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
/// and returns NULL otherwise.
CXXBaseSpecifier *
Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
SourceRange SpecifierRange,
bool Virtual, AccessSpecifier Access,
QualType BaseType,
SourceLocation BaseLoc) {
// C++ [class.union]p1:
// A union shall not have base classes.
if (Class->isUnion()) {
Diag(Class->getLocation(), diag::err_base_clause_on_union)
<< SpecifierRange;
return 0;
}
if (BaseType->isDependentType())
return new CXXBaseSpecifier(SpecifierRange, Virtual,
Class->getTagKind() == RecordDecl::TK_class,
Access, BaseType);
// Base specifiers must be record types.
if (!BaseType->isRecordType()) {
Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
return 0;
}
// C++ [class.union]p1:
// A union shall not be used as a base class.
if (BaseType->isUnionType()) {
Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
return 0;
}
// C++ [class.derived]p2:
// The class-name in a base-specifier shall not be an incompletely
// defined class.
if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class,
SpecifierRange))
return 0;
// If the base class is polymorphic, the new one is, too.
RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl();
assert(BaseDecl && "Record type has no declaration");
BaseDecl = BaseDecl->getDefinition(Context);
assert(BaseDecl && "Base type is not incomplete, but has no definition");
if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic())
Class->setPolymorphic(true);
// C++ [dcl.init.aggr]p1:
// An aggregate is [...] a class with [...] no base classes [...].
Class->setAggregate(false);
Class->setPOD(false);
// Create the base specifier.
// FIXME: Allocate via ASTContext?
return new CXXBaseSpecifier(SpecifierRange, Virtual,
Class->getTagKind() == RecordDecl::TK_class,
Access, BaseType);
}
/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
/// one entry in the base class list of a class specifier, for
/// example:
/// class foo : public bar, virtual private baz {
/// 'public bar' and 'virtual private baz' are each base-specifiers.
Sema::BaseResult
Sema::ActOnBaseSpecifier(DeclTy *classdecl, SourceRange SpecifierRange,
bool Virtual, AccessSpecifier Access,
TypeTy *basetype, SourceLocation BaseLoc) {
AdjustDeclIfTemplate(classdecl);
CXXRecordDecl *Class = cast<CXXRecordDecl>((Decl*)classdecl);
QualType BaseType = QualType::getFromOpaquePtr(basetype);
if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
Virtual, Access,
BaseType, BaseLoc))
return BaseSpec;
return true;
}
/// \brief Performs the actual work of attaching the given base class
/// specifiers to a C++ class.
bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
unsigned NumBases) {
if (NumBases == 0)
return false;
// Used to keep track of which base types we have already seen, so
// that we can properly diagnose redundant direct base types. Note
// that the key is always the unqualified canonical type of the base
// class.
std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
// Copy non-redundant base specifiers into permanent storage.
unsigned NumGoodBases = 0;
bool Invalid = false;
for (unsigned idx = 0; idx < NumBases; ++idx) {
QualType NewBaseType
= Context.getCanonicalType(Bases[idx]->getType());
NewBaseType = NewBaseType.getUnqualifiedType();
if (KnownBaseTypes[NewBaseType]) {
// C++ [class.mi]p3:
// A class shall not be specified as a direct base class of a
// derived class more than once.
Diag(Bases[idx]->getSourceRange().getBegin(),
diag::err_duplicate_base_class)
<< KnownBaseTypes[NewBaseType]->getType()
<< Bases[idx]->getSourceRange();
// Delete the duplicate base class specifier; we're going to
// overwrite its pointer later.
delete Bases[idx];
Invalid = true;
} else {
// Okay, add this new base class.
KnownBaseTypes[NewBaseType] = Bases[idx];
Bases[NumGoodBases++] = Bases[idx];
}
}
// Attach the remaining base class specifiers to the derived class.
Class->setBases(Bases, NumGoodBases);
// Delete the remaining (good) base class specifiers, since their
// data has been copied into the CXXRecordDecl.
for (unsigned idx = 0; idx < NumGoodBases; ++idx)
delete Bases[idx];
return Invalid;
}
/// ActOnBaseSpecifiers - Attach the given base specifiers to the
/// class, after checking whether there are any duplicate base
/// classes.
void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases,
unsigned NumBases) {
if (!ClassDecl || !Bases || !NumBases)
return;
AdjustDeclIfTemplate(ClassDecl);
AttachBaseSpecifiers(cast<CXXRecordDecl>((Decl*)ClassDecl),
(CXXBaseSpecifier**)(Bases), NumBases);
}
//===----------------------------------------------------------------------===//
// C++ class member Handling
//===----------------------------------------------------------------------===//
/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
/// bitfield width if there is one and 'InitExpr' specifies the initializer if
/// any. 'LastInGroup' is non-null for cases where one declspec has multiple
/// declarators on it.
Sema::DeclTy *
Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
ExprTy *BW, ExprTy *InitExpr,
DeclTy *LastInGroup) {
const DeclSpec &DS = D.getDeclSpec();
DeclarationName Name = GetNameForDeclarator(D);
Expr *BitWidth = static_cast<Expr*>(BW);
Expr *Init = static_cast<Expr*>(InitExpr);
SourceLocation Loc = D.getIdentifierLoc();
bool isFunc = D.isFunctionDeclarator();
// C++ 9.2p6: A member shall not be declared to have automatic storage
// duration (auto, register) or with the extern storage-class-specifier.
// C++ 7.1.1p8: The mutable specifier can be applied only to names of class
// data members and cannot be applied to names declared const or static,
// and cannot be applied to reference members.
switch (DS.getStorageClassSpec()) {
case DeclSpec::SCS_unspecified:
case DeclSpec::SCS_typedef:
case DeclSpec::SCS_static:
// FALL THROUGH.
break;
case DeclSpec::SCS_mutable:
if (isFunc) {
if (DS.getStorageClassSpecLoc().isValid())
Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
else
Diag(DS.getThreadSpecLoc(), diag::err_mutable_function);
// FIXME: It would be nicer if the keyword was ignored only for this
// declarator. Otherwise we could get follow-up errors.
D.getMutableDeclSpec().ClearStorageClassSpecs();
} else {
QualType T = GetTypeForDeclarator(D, S);
diag::kind err = static_cast<diag::kind>(0);
if (T->isReferenceType())
err = diag::err_mutable_reference;
else if (T.isConstQualified())
err = diag::err_mutable_const;
if (err != 0) {
if (DS.getStorageClassSpecLoc().isValid())
Diag(DS.getStorageClassSpecLoc(), err);
else
Diag(DS.getThreadSpecLoc(), err);
// FIXME: It would be nicer if the keyword was ignored only for this
// declarator. Otherwise we could get follow-up errors.
D.getMutableDeclSpec().ClearStorageClassSpecs();
}
}
break;
default:
if (DS.getStorageClassSpecLoc().isValid())
Diag(DS.getStorageClassSpecLoc(),
diag::err_storageclass_invalid_for_member);
else
Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member);
D.getMutableDeclSpec().ClearStorageClassSpecs();
}
if (!isFunc &&
D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename &&
D.getNumTypeObjects() == 0) {
// Check also for this case:
//
// typedef int f();
// f a;
//
QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep());
isFunc = TDType->isFunctionType();
}
bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
!isFunc);
Decl *Member;
if (isInstField) {
Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth,
AS);
assert(Member && "HandleField never returns null");
} else {
Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup));
if (!Member) {
if (BitWidth) DeleteExpr(BitWidth);
return LastInGroup;
}
// Non-instance-fields can't have a bitfield.
if (BitWidth) {
if (Member->isInvalidDecl()) {
// don't emit another diagnostic.
} else if (isa<VarDecl>(Member)) {
// C++ 9.6p3: A bit-field shall not be a static member.
// "static member 'A' cannot be a bit-field"
Diag(Loc, diag::err_static_not_bitfield)
<< Name << BitWidth->getSourceRange();
} else if (isa<TypedefDecl>(Member)) {
// "typedef member 'x' cannot be a bit-field"
Diag(Loc, diag::err_typedef_not_bitfield)
<< Name << BitWidth->getSourceRange();
} else {
// A function typedef ("typedef int f(); f a;").
// C++ 9.6p3: A bit-field shall have integral or enumeration type.
Diag(Loc, diag::err_not_integral_type_bitfield)
<< Name << cast<ValueDecl>(Member)->getType()
<< BitWidth->getSourceRange();
}
DeleteExpr(BitWidth);
BitWidth = 0;
Member->setInvalidDecl();
}
Member->setAccess(AS);
}
assert((Name || isInstField) && "No identifier for non-field ?");
if (Init)
AddInitializerToDecl(Member, ExprArg(*this, Init), false);
if (isInstField) {
FieldCollector->Add(cast<FieldDecl>(Member));
return LastInGroup;
}
return Member;
}
/// ActOnMemInitializer - Handle a C++ member initializer.
Sema::MemInitResult
Sema::ActOnMemInitializer(DeclTy *ConstructorD,
Scope *S,
IdentifierInfo *MemberOrBase,
SourceLocation IdLoc,
SourceLocation LParenLoc,
ExprTy **Args, unsigned NumArgs,
SourceLocation *CommaLocs,
SourceLocation RParenLoc) {
CXXConstructorDecl *Constructor
= dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD);
if (!Constructor) {
// The user wrote a constructor initializer on a function that is
// not a C++ constructor. Ignore the error for now, because we may
// have more member initializers coming; we'll diagnose it just
// once in ActOnMemInitializers.
return true;
}
CXXRecordDecl *ClassDecl = Constructor->getParent();
// C++ [class.base.init]p2:
// Names in a mem-initializer-id are looked up in the scope of the
// constructor’s class and, if not found in that scope, are looked
// up in the scope containing the constructor’s
// definition. [Note: if the constructor’s class contains a member
// with the same name as a direct or virtual base class of the
// class, a mem-initializer-id naming the member or base class and
// composed of a single identifier refers to the class member. A
// mem-initializer-id for the hidden base class may be specified
// using a qualified name. ]
// Look for a member, first.
FieldDecl *Member = 0;
DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase);
if (Result.first != Result.second)
Member = dyn_cast<FieldDecl>(*Result.first);
// FIXME: Handle members of an anonymous union.
if (Member) {
// FIXME: Perform direct initialization of the member.
return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs);
}
// It didn't name a member, so see if it names a class.
TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/);
if (!BaseTy)
return Diag(IdLoc, diag::err_mem_init_not_member_or_class)
<< MemberOrBase << SourceRange(IdLoc, RParenLoc);
QualType BaseType = QualType::getFromOpaquePtr(BaseTy);
if (!BaseType->isRecordType())
return Diag(IdLoc, diag::err_base_init_does_not_name_class)
<< BaseType << SourceRange(IdLoc, RParenLoc);
// C++ [class.base.init]p2:
// [...] Unless the mem-initializer-id names a nonstatic data
// member of the constructor’s class or a direct or virtual base
// of that class, the mem-initializer is ill-formed. A
// mem-initializer-list can initialize a base class using any
// name that denotes that base class type.
// First, check for a direct base class.
const CXXBaseSpecifier *DirectBaseSpec = 0;
for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin();
Base != ClassDecl->bases_end(); ++Base) {
if (Context.getCanonicalType(BaseType).getUnqualifiedType() ==
Context.getCanonicalType(Base->getType()).getUnqualifiedType()) {
// We found a direct base of this type. That's what we're
// initializing.
DirectBaseSpec = &*Base;
break;
}
}
// Check for a virtual base class.
// FIXME: We might be able to short-circuit this if we know in
// advance that there are no virtual bases.
const CXXBaseSpecifier *VirtualBaseSpec = 0;
if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
// We haven't found a base yet; search the class hierarchy for a
// virtual base class.
BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
/*DetectVirtual=*/false);
if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) {
for (BasePaths::paths_iterator Path = Paths.begin();
Path != Paths.end(); ++Path) {
if (Path->back().Base->isVirtual()) {
VirtualBaseSpec = Path->back().Base;
break;
}
}
}
}
// C++ [base.class.init]p2:
// If a mem-initializer-id is ambiguous because it designates both
// a direct non-virtual base class and an inherited virtual base
// class, the mem-initializer is ill-formed.
if (DirectBaseSpec && VirtualBaseSpec)
return Diag(IdLoc, diag::err_base_init_direct_and_virtual)
<< MemberOrBase << SourceRange(IdLoc, RParenLoc);
return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs);
}
void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
DeclTy *TagDecl,
SourceLocation LBrac,
SourceLocation RBrac) {
TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl);
ActOnFields(S, RLoc, TagDecl,
(DeclTy**)FieldCollector->getCurFields(),
FieldCollector->getCurNumFields(), LBrac, RBrac, 0);
if (!Template)
AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl));
}
/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
/// special functions, such as the default constructor, copy
/// constructor, or destructor, to the given C++ class (C++
/// [special]p1). This routine can only be executed just before the
/// definition of the class is complete.
void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
QualType ClassType = Context.getTypeDeclType(ClassDecl);
ClassType = Context.getCanonicalType(ClassType);
if (!ClassDecl->hasUserDeclaredConstructor()) {
// C++ [class.ctor]p5:
// A default constructor for a class X is a constructor of class X
// that can be called without an argument. If there is no
// user-declared constructor for class X, a default constructor is
// implicitly declared. An implicitly-declared default constructor
// is an inline public member of its class.
DeclarationName Name
= Context.DeclarationNames.getCXXConstructorName(ClassType);
CXXConstructorDecl *DefaultCon =
CXXConstructorDecl::Create(Context, ClassDecl,
ClassDecl->getLocation(), Name,
Context.getFunctionType(Context.VoidTy,
0, 0, false, 0),
/*isExplicit=*/false,
/*isInline=*/true,
/*isImplicitlyDeclared=*/true);
DefaultCon->setAccess(AS_public);
DefaultCon->setImplicit();
ClassDecl->addDecl(DefaultCon);
// Notify the class that we've added a constructor.
ClassDecl->addedConstructor(Context, DefaultCon);
}
if (!ClassDecl->hasUserDeclaredCopyConstructor()) {
// C++ [class.copy]p4:
// If the class definition does not explicitly declare a copy
// constructor, one is declared implicitly.
// C++ [class.copy]p5:
// The implicitly-declared copy constructor for a class X will
// have the form
//
// X::X(const X&)
//
// if
bool HasConstCopyConstructor = true;
// -- each direct or virtual base class B of X has a copy
// constructor whose first parameter is of type const B& or
// const volatile B&, and
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) {
const CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl());
HasConstCopyConstructor
= BaseClassDecl->hasConstCopyConstructor(Context);
}
// -- for all the nonstatic data members of X that are of a
// class type M (or array thereof), each such class type
// has a copy constructor whose first parameter is of type
// const M& or const volatile M&.
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin();
HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) {
QualType FieldType = (*Field)->getType();
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (const RecordType *FieldClassType = FieldType->getAsRecordType()) {
const CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
HasConstCopyConstructor
= FieldClassDecl->hasConstCopyConstructor(Context);
}
}
// Otherwise, the implicitly declared copy constructor will have
// the form
//
// X::X(X&)
QualType ArgType = ClassType;
if (HasConstCopyConstructor)
ArgType = ArgType.withConst();
ArgType = Context.getReferenceType(ArgType);
// An implicitly-declared copy constructor is an inline public
// member of its class.
DeclarationName Name
= Context.DeclarationNames.getCXXConstructorName(ClassType);
CXXConstructorDecl *CopyConstructor
= CXXConstructorDecl::Create(Context, ClassDecl,
ClassDecl->getLocation(), Name,
Context.getFunctionType(Context.VoidTy,
&ArgType, 1,
false, 0),
/*isExplicit=*/false,
/*isInline=*/true,
/*isImplicitlyDeclared=*/true);
CopyConstructor->setAccess(AS_public);
CopyConstructor->setImplicit();
// Add the parameter to the constructor.
ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
ClassDecl->getLocation(),
/*IdentifierInfo=*/0,
ArgType, VarDecl::None, 0);
CopyConstructor->setParams(Context, &FromParam, 1);
ClassDecl->addedConstructor(Context, CopyConstructor);
ClassDecl->addDecl(CopyConstructor);
}
if (!ClassDecl->hasUserDeclaredCopyAssignment()) {
// Note: The following rules are largely analoguous to the copy
// constructor rules. Note that virtual bases are not taken into account
// for determining the argument type of the operator. Note also that
// operators taking an object instead of a reference are allowed.
//
// C++ [class.copy]p10:
// If the class definition does not explicitly declare a copy
// assignment operator, one is declared implicitly.
// The implicitly-defined copy assignment operator for a class X
// will have the form
//
// X& X::operator=(const X&)
//
// if
bool HasConstCopyAssignment = true;
// -- each direct base class B of X has a copy assignment operator
// whose parameter is of type const B&, const volatile B& or B,
// and
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) {
const CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl());
HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context);
}
// -- for all the nonstatic data members of X that are of a class
// type M (or array thereof), each such class type has a copy
// assignment operator whose parameter is of type const M&,
// const volatile M& or M.
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin();
HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) {
QualType FieldType = (*Field)->getType();
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (const RecordType *FieldClassType = FieldType->getAsRecordType()) {
const CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
HasConstCopyAssignment
= FieldClassDecl->hasConstCopyAssignment(Context);
}
}
// Otherwise, the implicitly declared copy assignment operator will
// have the form
//
// X& X::operator=(X&)
QualType ArgType = ClassType;
QualType RetType = Context.getReferenceType(ArgType);
if (HasConstCopyAssignment)
ArgType = ArgType.withConst();
ArgType = Context.getReferenceType(ArgType);
// An implicitly-declared copy assignment operator is an inline public
// member of its class.
DeclarationName Name =
Context.DeclarationNames.getCXXOperatorName(OO_Equal);
CXXMethodDecl *CopyAssignment =
CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name,
Context.getFunctionType(RetType, &ArgType, 1,
false, 0),
/*isStatic=*/false, /*isInline=*/true);
CopyAssignment->setAccess(AS_public);
CopyAssignment->setImplicit();
// Add the parameter to the operator.
ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
ClassDecl->getLocation(),
/*IdentifierInfo=*/0,
ArgType, VarDecl::None, 0);
CopyAssignment->setParams(Context, &FromParam, 1);
// Don't call addedAssignmentOperator. There is no way to distinguish an
// implicit from an explicit assignment operator.
ClassDecl->addDecl(CopyAssignment);
}
if (!ClassDecl->hasUserDeclaredDestructor()) {
// C++ [class.dtor]p2:
// If a class has no user-declared destructor, a destructor is
// declared implicitly. An implicitly-declared destructor is an
// inline public member of its class.
DeclarationName Name
= Context.DeclarationNames.getCXXDestructorName(ClassType);
CXXDestructorDecl *Destructor
= CXXDestructorDecl::Create(Context, ClassDecl,
ClassDecl->getLocation(), Name,
Context.getFunctionType(Context.VoidTy,
0, 0, false, 0),
/*isInline=*/true,
/*isImplicitlyDeclared=*/true);
Destructor->setAccess(AS_public);
Destructor->setImplicit();
ClassDecl->addDecl(Destructor);
}
}
/// ActOnStartDelayedCXXMethodDeclaration - We have completed
/// parsing a top-level (non-nested) C++ class, and we are now
/// parsing those parts of the given Method declaration that could
/// not be parsed earlier (C++ [class.mem]p2), such as default
/// arguments. This action should enter the scope of the given
/// Method declaration as if we had just parsed the qualified method
/// name. However, it should not bring the parameters into scope;
/// that will be performed by ActOnDelayedCXXMethodParameter.
void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) {
CXXScopeSpec SS;
SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext());
ActOnCXXEnterDeclaratorScope(S, SS);
}
/// ActOnDelayedCXXMethodParameter - We've already started a delayed
/// C++ method declaration. We're (re-)introducing the given
/// function parameter into scope for use in parsing later parts of
/// the method declaration. For example, we could see an
/// ActOnParamDefaultArgument event for this parameter.
void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) {
ParmVarDecl *Param = (ParmVarDecl*)ParamD;
// If this parameter has an unparsed default argument, clear it out
// to make way for the parsed default argument.
if (Param->hasUnparsedDefaultArg())
Param->setDefaultArg(0);
S->AddDecl(Param);
if (Param->getDeclName())
IdResolver.AddDecl(Param);
}
/// ActOnFinishDelayedCXXMethodDeclaration - We have finished
/// processing the delayed method declaration for Method. The method
/// declaration is now considered finished. There may be a separate
/// ActOnStartOfFunctionDef action later (not necessarily
/// immediately!) for this method, if it was also defined inside the
/// class body.
void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) {
FunctionDecl *Method = (FunctionDecl*)MethodD;
CXXScopeSpec SS;
SS.setScopeRep(Method->getDeclContext());
ActOnCXXExitDeclaratorScope(S, SS);
// Now that we have our default arguments, check the constructor
// again. It could produce additional diagnostics or affect whether
// the class has implicitly-declared destructors, among other
// things.
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) {
if (CheckConstructor(Constructor))
Constructor->setInvalidDecl();
}
// Check the default arguments, which we may have added.
if (!Method->isInvalidDecl())
CheckCXXDefaultArguments(Method);
}
/// CheckConstructorDeclarator - Called by ActOnDeclarator to check
/// the well-formedness of the constructor declarator @p D with type @p
/// R. If there are any errors in the declarator, this routine will
/// emit diagnostics and return true. Otherwise, it will return
/// false. Either way, the type @p R will be updated to reflect a
/// well-formed type for the constructor.
bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R,
FunctionDecl::StorageClass& SC) {
bool isVirtual = D.getDeclSpec().isVirtualSpecified();
bool isInvalid = false;
// C++ [class.ctor]p3:
// A constructor shall not be virtual (10.3) or static (9.4). A
// constructor can be invoked for a const, volatile or const
// volatile object. A constructor shall not be declared const,
// volatile, or const volatile (9.3.2).
if (isVirtual) {
Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
<< "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
<< SourceRange(D.getIdentifierLoc());
isInvalid = true;
}
if (SC == FunctionDecl::Static) {
Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
<< "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
<< SourceRange(D.getIdentifierLoc());
isInvalid = true;
SC = FunctionDecl::None;
}
if (D.getDeclSpec().hasTypeSpecifier()) {
// Constructors don't have return types, but the parser will
// happily parse something like:
//
// class X {
// float X(float);
// };
//
// The return type will be eliminated later.
Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
<< SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
<< SourceRange(D.getIdentifierLoc());
}
if (R->getAsFunctionProtoType()->getTypeQuals() != 0) {
DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
if (FTI.TypeQuals & QualType::Const)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "const" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & QualType::Volatile)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "volatile" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & QualType::Restrict)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "restrict" << SourceRange(D.getIdentifierLoc());
}
// Rebuild the function type "R" without any type qualifiers (in
// case any of the errors above fired) and with "void" as the
// return type, since constructors don't have return types. We
// *always* have to do this, because GetTypeForDeclarator will
// put in a result type of "int" when none was specified.
const FunctionProtoType *Proto = R->getAsFunctionProtoType();
R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(),
Proto->getNumArgs(),
Proto->isVariadic(),
0);
return isInvalid;
}
/// CheckConstructor - Checks a fully-formed constructor for
/// well-formedness, issuing any diagnostics required. Returns true if
/// the constructor declarator is invalid.
bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
if (Constructor->isInvalidDecl())
return true;
CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext());
bool Invalid = false;
// C++ [class.copy]p3:
// A declaration of a constructor for a class X is ill-formed if
// its first parameter is of type (optionally cv-qualified) X and
// either there are no other parameters or else all other
// parameters have default arguments.
if ((Constructor->getNumParams() == 1) ||
(Constructor->getNumParams() > 1 &&
Constructor->getParamDecl(1)->getDefaultArg() != 0)) {
QualType ParamType = Constructor->getParamDecl(0)->getType();
QualType ClassTy = Context.getTagDeclType(ClassDecl);
if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg)
<< SourceRange(Constructor->getParamDecl(0)->getLocation());
Invalid = true;
}
}
// Notify the class that we've added a constructor.
ClassDecl->addedConstructor(Context, Constructor);
return Invalid;
}
/// CheckDestructorDeclarator - Called by ActOnDeclarator to check
/// the well-formednes of the destructor declarator @p D with type @p
/// R. If there are any errors in the declarator, this routine will
/// emit diagnostics and return true. Otherwise, it will return
/// false. Either way, the type @p R will be updated to reflect a
/// well-formed type for the destructor.
bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R,
FunctionDecl::StorageClass& SC) {
bool isInvalid = false;
// C++ [class.dtor]p1:
// [...] A typedef-name that names a class is a class-name
// (7.1.3); however, a typedef-name that names a class shall not
// be used as the identifier in the declarator for a destructor
// declaration.
QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType());
if (DeclaratorType->getAsTypedefType()) {
Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
<< DeclaratorType;
isInvalid = true;
}
// C++ [class.dtor]p2:
// A destructor is used to destroy objects of its class type. A
// destructor takes no parameters, and no return type can be
// specified for it (not even void). The address of a destructor
// shall not be taken. A destructor shall not be static. A
// destructor can be invoked for a const, volatile or const
// volatile object. A destructor shall not be declared const,
// volatile or const volatile (9.3.2).
if (SC == FunctionDecl::Static) {
Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
<< "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
<< SourceRange(D.getIdentifierLoc());
isInvalid = true;
SC = FunctionDecl::None;
}
if (D.getDeclSpec().hasTypeSpecifier()) {
// Destructors don't have return types, but the parser will
// happily parse something like:
//
// class X {
// float ~X();
// };
//
// The return type will be eliminated later.
Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
<< SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
<< SourceRange(D.getIdentifierLoc());
}
if (R->getAsFunctionProtoType()->getTypeQuals() != 0) {
DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
if (FTI.TypeQuals & QualType::Const)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "const" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & QualType::Volatile)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "volatile" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & QualType::Restrict)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "restrict" << SourceRange(D.getIdentifierLoc());
}
// Make sure we don't have any parameters.
if (R->getAsFunctionProtoType()->getNumArgs() > 0) {
Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
// Delete the parameters.
D.getTypeObject(0).Fun.freeArgs();
}
// Make sure the destructor isn't variadic.
if (R->getAsFunctionProtoType()->isVariadic())
Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
// Rebuild the function type "R" without any type qualifiers or
// parameters (in case any of the errors above fired) and with
// "void" as the return type, since destructors don't have return
// types. We *always* have to do this, because GetTypeForDeclarator
// will put in a result type of "int" when none was specified.
R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0);
return isInvalid;
}
/// CheckConversionDeclarator - Called by ActOnDeclarator to check the
/// well-formednes of the conversion function declarator @p D with
/// type @p R. If there are any errors in the declarator, this routine
/// will emit diagnostics and return true. Otherwise, it will return
/// false. Either way, the type @p R will be updated to reflect a
/// well-formed type for the conversion operator.
bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
FunctionDecl::StorageClass& SC) {
bool isInvalid = false;
// C++ [class.conv.fct]p1:
// Neither parameter types nor return type can be specified. The
// type of a conversion function (8.3.5) is “function taking no
// parameter returning conversion-type-id.”
if (SC == FunctionDecl::Static) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
<< "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
<< SourceRange(D.getIdentifierLoc());
isInvalid = true;
SC = FunctionDecl::None;
}
if (D.getDeclSpec().hasTypeSpecifier()) {
// Conversion functions don't have return types, but the parser will
// happily parse something like:
//
// class X {
// float operator bool();
// };
//
// The return type will be changed later anyway.
Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
<< SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
<< SourceRange(D.getIdentifierLoc());
}
// Make sure we don't have any parameters.
if (R->getAsFunctionProtoType()->getNumArgs() > 0) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
// Delete the parameters.
D.getTypeObject(0).Fun.freeArgs();
}
// Make sure the conversion function isn't variadic.
if (R->getAsFunctionProtoType()->isVariadic())
Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
// C++ [class.conv.fct]p4:
// The conversion-type-id shall not represent a function type nor
// an array type.
QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType());
if (ConvType->isArrayType()) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
ConvType = Context.getPointerType(ConvType);
} else if (ConvType->isFunctionType()) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
ConvType = Context.getPointerType(ConvType);
}
// Rebuild the function type "R" without any parameters (in case any
// of the errors above fired) and with the conversion type as the
// return type.
R = Context.getFunctionType(ConvType, 0, 0, false,
R->getAsFunctionProtoType()->getTypeQuals());
// C++0x explicit conversion operators.
if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x)
Diag(D.getDeclSpec().getExplicitSpecLoc(),
diag::warn_explicit_conversion_functions)
<< SourceRange(D.getDeclSpec().getExplicitSpecLoc());
return isInvalid;
}
/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
/// the declaration of the given C++ conversion function. This routine
/// is responsible for recording the conversion function in the C++
/// class, if possible.
Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
assert(Conversion && "Expected to receive a conversion function declaration");
// Set the lexical context of this conversion function
Conversion->setLexicalDeclContext(CurContext);
CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
// Make sure we aren't redeclaring the conversion function.
QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
// C++ [class.conv.fct]p1:
// [...] A conversion function is never used to convert a
// (possibly cv-qualified) object to the (possibly cv-qualified)
// same object type (or a reference to it), to a (possibly
// cv-qualified) base class of that type (or a reference to it),
// or to (possibly cv-qualified) void.
// FIXME: Suppress this warning if the conversion function ends up
// being a virtual function that overrides a virtual function in a
// base class.
QualType ClassType
= Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType())
ConvType = ConvTypeRef->getPointeeType();
if (ConvType->isRecordType()) {
ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
if (ConvType == ClassType)
Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
<< ClassType;
else if (IsDerivedFrom(ClassType, ConvType))
Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
<< ClassType << ConvType;
} else if (ConvType->isVoidType()) {
Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
<< ClassType << ConvType;
}
if (Conversion->getPreviousDeclaration()) {
OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions();
for (OverloadedFunctionDecl::function_iterator
Conv = Conversions->function_begin(),
ConvEnd = Conversions->function_end();
Conv != ConvEnd; ++Conv) {
if (*Conv == Conversion->getPreviousDeclaration()) {
*Conv = Conversion;
return (DeclTy *)Conversion;
}
}
assert(Conversion->isInvalidDecl() && "Conversion should not get here.");
} else
ClassDecl->addConversionFunction(Context, Conversion);
return (DeclTy *)Conversion;
}
//===----------------------------------------------------------------------===//
// Namespace Handling
//===----------------------------------------------------------------------===//
/// ActOnStartNamespaceDef - This is called at the start of a namespace
/// definition.
Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
SourceLocation IdentLoc,
IdentifierInfo *II,
SourceLocation LBrace) {
NamespaceDecl *Namespc =
NamespaceDecl::Create(Context, CurContext, IdentLoc, II);
Namespc->setLBracLoc(LBrace);
Scope *DeclRegionScope = NamespcScope->getParent();
if (II) {
// C++ [namespace.def]p2:
// The identifier in an original-namespace-definition shall not have been
// previously defined in the declarative region in which the
// original-namespace-definition appears. The identifier in an
// original-namespace-definition is the name of the namespace. Subsequently
// in that declarative region, it is treated as an original-namespace-name.
NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName,
true);
if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) {
// This is an extended namespace definition.
// Attach this namespace decl to the chain of extended namespace
// definitions.
OrigNS->setNextNamespace(Namespc);
Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace());
// Remove the previous declaration from the scope.
if (DeclRegionScope->isDeclScope(OrigNS)) {
IdResolver.RemoveDecl(OrigNS);
DeclRegionScope->RemoveDecl(OrigNS);
}
} else if (PrevDecl) {
// This is an invalid name redefinition.
Diag(Namespc->getLocation(), diag::err_redefinition_different_kind)
<< Namespc->getDeclName();
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Namespc->setInvalidDecl();
// Continue on to push Namespc as current DeclContext and return it.
}
PushOnScopeChains(Namespc, DeclRegionScope);
} else {
// FIXME: Handle anonymous namespaces
}
// Although we could have an invalid decl (i.e. the namespace name is a
// redefinition), push it as current DeclContext and try to continue parsing.
// FIXME: We should be able to push Namespc here, so that the
// each DeclContext for the namespace has the declarations
// that showed up in that particular namespace definition.
PushDeclContext(NamespcScope, Namespc);
return Namespc;
}
/// ActOnFinishNamespaceDef - This callback is called after a namespace is
/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) {
Decl *Dcl = static_cast<Decl *>(D);
NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
assert(Namespc && "Invalid parameter, expected NamespaceDecl");
Namespc->setRBracLoc(RBrace);
PopDeclContext();
}
Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S,
SourceLocation UsingLoc,
SourceLocation NamespcLoc,
const CXXScopeSpec &SS,
SourceLocation IdentLoc,
IdentifierInfo *NamespcName,
AttributeList *AttrList) {
assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
assert(NamespcName && "Invalid NamespcName.");
assert(IdentLoc.isValid() && "Invalid NamespceName location.");
assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
UsingDirectiveDecl *UDir = 0;
// Lookup namespace name.
LookupResult R = LookupParsedName(S, &SS, NamespcName,
LookupNamespaceName, false);
if (R.isAmbiguous()) {
DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc);
return 0;
}
if (NamedDecl *NS = R) {
assert(isa<NamespaceDecl>(NS) && "expected namespace decl");
// C++ [namespace.udir]p1:
// A using-directive specifies that the names in the nominated
// namespace can be used in the scope in which the
// using-directive appears after the using-directive. During
// unqualified name lookup (3.4.1), the names appear as if they
// were declared in the nearest enclosing namespace which
// contains both the using-directive and the nominated
// namespace. [Note: in this context, “contains” means “contains
// directly or indirectly”. ]
// Find enclosing context containing both using-directive and
// nominated namespace.
DeclContext *CommonAncestor = cast<DeclContext>(NS);
while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
CommonAncestor = CommonAncestor->getParent();
UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc,
NamespcLoc, IdentLoc,
cast<NamespaceDecl>(NS),
CommonAncestor);
PushUsingDirective(S, UDir);
} else {
Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
}
// FIXME: We ignore attributes for now.
delete AttrList;
return UDir;
}
void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
// If scope has associated entity, then using directive is at namespace
// or translation unit scope. We add UsingDirectiveDecls, into
// it's lookup structure.
if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()))
Ctx->addDecl(UDir);
else
// Otherwise it is block-sope. using-directives will affect lookup
// only to the end of scope.
S->PushUsingDirective(UDir);
}
/// AddCXXDirectInitializerToDecl - This action is called immediately after
/// ActOnDeclarator, when a C++ direct initializer is present.
/// e.g: "int x(1);"
void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc,
MultiExprArg Exprs,
SourceLocation *CommaLocs,
SourceLocation RParenLoc) {
unsigned NumExprs = Exprs.size();
assert(NumExprs != 0 && Exprs.get() && "missing expressions");
Decl *RealDecl = static_cast<Decl *>(Dcl);
// If there is no declaration, there was an error parsing it. Just ignore
// the initializer.
if (RealDecl == 0) {
return;
}
VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
if (!VDecl) {
Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
RealDecl->setInvalidDecl();
return;
}
// We will treat direct-initialization as a copy-initialization:
// int x(1); -as-> int x = 1;
// ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
//
// Clients that want to distinguish between the two forms, can check for
// direct initializer using VarDecl::hasCXXDirectInitializer().
// A major benefit is that clients that don't particularly care about which
// exactly form was it (like the CodeGen) can handle both cases without
// special case code.
// C++ 8.5p11:
// The form of initialization (using parentheses or '=') is generally
// insignificant, but does matter when the entity being initialized has a
// class type.
QualType DeclInitType = VDecl->getType();
if (const ArrayType *Array = Context.getAsArrayType(DeclInitType))
DeclInitType = Array->getElementType();
if (VDecl->getType()->isRecordType()) {
CXXConstructorDecl *Constructor
= PerformInitializationByConstructor(DeclInitType,
(Expr **)Exprs.get(), NumExprs,
VDecl->getLocation(),
SourceRange(VDecl->getLocation(),
RParenLoc),
VDecl->getDeclName(),
IK_Direct);
if (!Constructor)
RealDecl->setInvalidDecl();
else
Exprs.release();
// Let clients know that initialization was done with a direct
// initializer.
VDecl->setCXXDirectInitializer(true);
// FIXME: Add ExprTys and Constructor to the RealDecl as part of
// the initializer.
return;
}
if (NumExprs > 1) {
Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg)
<< SourceRange(VDecl->getLocation(), RParenLoc);
RealDecl->setInvalidDecl();
return;
}
// Let clients know that initialization was done with a direct initializer.
VDecl->setCXXDirectInitializer(true);
assert(NumExprs == 1 && "Expected 1 expression");
// Set the init expression, handles conversions.
AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]),
/*DirectInit=*/true);
}
/// PerformInitializationByConstructor - Perform initialization by
/// constructor (C++ [dcl.init]p14), which may occur as part of
/// direct-initialization or copy-initialization. We are initializing
/// an object of type @p ClassType with the given arguments @p
/// Args. @p Loc is the location in the source code where the
/// initializer occurs (e.g., a declaration, member initializer,
/// functional cast, etc.) while @p Range covers the whole
/// initialization. @p InitEntity is the entity being initialized,
/// which may by the name of a declaration or a type. @p Kind is the
/// kind of initialization we're performing, which affects whether
/// explicit constructors will be considered. When successful, returns
/// the constructor that will be used to perform the initialization;
/// when the initialization fails, emits a diagnostic and returns
/// null.
CXXConstructorDecl *
Sema::PerformInitializationByConstructor(QualType ClassType,
Expr **Args, unsigned NumArgs,
SourceLocation Loc, SourceRange Range,
DeclarationName InitEntity,
InitializationKind Kind) {
const RecordType *ClassRec = ClassType->getAsRecordType();
assert(ClassRec && "Can only initialize a class type here");
// C++ [dcl.init]p14:
//
// If the initialization is direct-initialization, or if it is
// copy-initialization where the cv-unqualified version of the
// source type is the same class as, or a derived class of, the
// class of the destination, constructors are considered. The
// applicable constructors are enumerated (13.3.1.3), and the
// best one is chosen through overload resolution (13.3). The
// constructor so selected is called to initialize the object,
// with the initializer expression(s) as its argument(s). If no
// constructor applies, or the overload resolution is ambiguous,
// the initialization is ill-formed.
const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl());
OverloadCandidateSet CandidateSet;
// Add constructors to the overload set.
DeclarationName ConstructorName
= Context.DeclarationNames.getCXXConstructorName(
Context.getCanonicalType(ClassType.getUnqualifiedType()));
DeclContext::lookup_const_iterator Con, ConEnd;
for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName);
Con != ConEnd; ++Con) {
CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
if ((Kind == IK_Direct) ||
(Kind == IK_Copy && Constructor->isConvertingConstructor()) ||
(Kind == IK_Default && Constructor->isDefaultConstructor()))
AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet);
}
// FIXME: When we decide not to synthesize the implicitly-declared
// constructors, we'll need to make them appear here.
OverloadCandidateSet::iterator Best;
switch (BestViableFunction(CandidateSet, Best)) {
case OR_Success:
// We found a constructor. Return it.
return cast<CXXConstructorDecl>(Best->Function);
case OR_No_Viable_Function:
if (InitEntity)
Diag(Loc, diag::err_ovl_no_viable_function_in_init)
<< InitEntity << Range;
else
Diag(Loc, diag::err_ovl_no_viable_function_in_init)
<< ClassType << Range;
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
return 0;
case OR_Ambiguous:
if (InitEntity)
Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range;
else
Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range;
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
return 0;
case OR_Deleted:
if (InitEntity)
Diag(Loc, diag::err_ovl_deleted_init)
<< Best->Function->isDeleted()
<< InitEntity << Range;
else
Diag(Loc, diag::err_ovl_deleted_init)
<< Best->Function->isDeleted()
<< InitEntity << Range;
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
return 0;
}
return 0;
}
/// CompareReferenceRelationship - Compare the two types T1 and T2 to
/// determine whether they are reference-related,
/// reference-compatible, reference-compatible with added
/// qualification, or incompatible, for use in C++ initialization by
/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference
/// type, and the first type (T1) is the pointee type of the reference
/// type being initialized.
Sema::ReferenceCompareResult
Sema::CompareReferenceRelationship(QualType T1, QualType T2,
bool& DerivedToBase) {
assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type");
assert(!T2->isReferenceType() && "T2 cannot be a reference type");
T1 = Context.getCanonicalType(T1);
T2 = Context.getCanonicalType(T2);
QualType UnqualT1 = T1.getUnqualifiedType();
QualType UnqualT2 = T2.getUnqualifiedType();
// C++ [dcl.init.ref]p4:
// Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is
// reference-related to “cv2 T2” if T1 is the same type as T2, or
// T1 is a base class of T2.
if (UnqualT1 == UnqualT2)
DerivedToBase = false;
else if (IsDerivedFrom(UnqualT2, UnqualT1))
DerivedToBase = true;
else
return Ref_Incompatible;
// At this point, we know that T1 and T2 are reference-related (at
// least).
// C++ [dcl.init.ref]p4:
// "cv1 T1” is reference-compatible with “cv2 T2” if T1 is
// reference-related to T2 and cv1 is the same cv-qualification
// as, or greater cv-qualification than, cv2. For purposes of
// overload resolution, cases for which cv1 is greater
// cv-qualification than cv2 are identified as
// reference-compatible with added qualification (see 13.3.3.2).
if (T1.getCVRQualifiers() == T2.getCVRQualifiers())
return Ref_Compatible;
else if (T1.isMoreQualifiedThan(T2))
return Ref_Compatible_With_Added_Qualification;
else
return Ref_Related;
}
/// CheckReferenceInit - Check the initialization of a reference
/// variable with the given initializer (C++ [dcl.init.ref]). Init is
/// the initializer (either a simple initializer or an initializer
/// list), and DeclType is the type of the declaration. When ICS is
/// non-null, this routine will compute the implicit conversion
/// sequence according to C++ [over.ics.ref] and will not produce any
/// diagnostics; when ICS is null, it will emit diagnostics when any
/// errors are found. Either way, a return value of true indicates
/// that there was a failure, a return value of false indicates that
/// the reference initialization succeeded.
///
/// When @p SuppressUserConversions, user-defined conversions are
/// suppressed.
/// When @p AllowExplicit, we also permit explicit user-defined
/// conversion functions.
bool
Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType,
ImplicitConversionSequence *ICS,
bool SuppressUserConversions,
bool AllowExplicit) {
assert(DeclType->isReferenceType() && "Reference init needs a reference");
QualType T1 = DeclType->getAsReferenceType()->getPointeeType();
QualType T2 = Init->getType();
// If the initializer is the address of an overloaded function, try
// to resolve the overloaded function. If all goes well, T2 is the
// type of the resulting function.
if (Context.getCanonicalType(T2) == Context.OverloadTy) {
FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType,
ICS != 0);
if (Fn) {
// Since we're performing this reference-initialization for
// real, update the initializer with the resulting function.
if (!ICS) {
if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin()))
return true;
FixOverloadedFunctionReference(Init, Fn);
}
T2 = Fn->getType();
}
}
// Compute some basic properties of the types and the initializer.
bool DerivedToBase = false;
Expr::isLvalueResult InitLvalue = Init->isLvalue(Context);
ReferenceCompareResult RefRelationship
= CompareReferenceRelationship(T1, T2, DerivedToBase);
// Most paths end in a failed conversion.
if (ICS)
ICS->ConversionKind = ImplicitConversionSequence::BadConversion;
// C++ [dcl.init.ref]p5:
// A reference to type “cv1 T1” is initialized by an expression
// of type “cv2 T2” as follows:
// -- If the initializer expression
bool BindsDirectly = false;
// -- is an lvalue (but is not a bit-field), and “cv1 T1” is
// reference-compatible with “cv2 T2,” or
//
// Note that the bit-field check is skipped if we are just computing
// the implicit conversion sequence (C++ [over.best.ics]p2).
if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) &&
RefRelationship >= Ref_Compatible_With_Added_Qualification) {
BindsDirectly = true;
if (ICS) {
// C++ [over.ics.ref]p1:
// When a parameter of reference type binds directly (8.5.3)
// to an argument expression, the implicit conversion sequence
// is the identity conversion, unless the argument expression
// has a type that is a derived class of the parameter type,
// in which case the implicit conversion sequence is a
// derived-to-base Conversion (13.3.3.1).
ICS->ConversionKind = ImplicitConversionSequence::StandardConversion;
ICS->Standard.First = ICK_Identity;
ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity;
ICS->Standard.Third = ICK_Identity;
ICS->Standard.FromTypePtr = T2.getAsOpaquePtr();
ICS->Standard.ToTypePtr = T1.getAsOpaquePtr();
ICS->Standard.ReferenceBinding = true;
ICS->Standard.DirectBinding = true;
// Nothing more to do: the inaccessibility/ambiguity check for
// derived-to-base conversions is suppressed when we're
// computing the implicit conversion sequence (C++
// [over.best.ics]p2).
return false;
} else {
// Perform the conversion.
// FIXME: Binding to a subobject of the lvalue is going to require
// more AST annotation than this.
ImpCastExprToType(Init, T1, /*isLvalue=*/true);
}
}
// -- has a class type (i.e., T2 is a class type) and can be
// implicitly converted to an lvalue of type “cv3 T3,”
// where “cv1 T1” is reference-compatible with “cv3 T3”
// 92) (this conversion is selected by enumerating the
// applicable conversion functions (13.3.1.6) and choosing
// the best one through overload resolution (13.3)),
if (!SuppressUserConversions && T2->isRecordType()) {
// FIXME: Look for conversions in base classes!
CXXRecordDecl *T2RecordDecl
= dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl());
OverloadCandidateSet CandidateSet;
OverloadedFunctionDecl *Conversions
= T2RecordDecl->getConversionFunctions();
for (OverloadedFunctionDecl::function_iterator Func
= Conversions->function_begin();
Func != Conversions->function_end(); ++Func) {
CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func);
// If the conversion function doesn't return a reference type,
// it can't be considered for this conversion.
// FIXME: This will change when we support rvalue references.
if (Conv->getConversionType()->isReferenceType() &&
(AllowExplicit || !Conv->isExplicit()))
AddConversionCandidate(Conv, Init, DeclType, CandidateSet);
}
OverloadCandidateSet::iterator Best;
switch (BestViableFunction(CandidateSet, Best)) {
case OR_Success:
// This is a direct binding.
BindsDirectly = true;
if (ICS) {
// C++ [over.ics.ref]p1:
//
// [...] If the parameter binds directly to the result of
// applying a conversion function to the argument
// expression, the implicit conversion sequence is a
// user-defined conversion sequence (13.3.3.1.2), with the
// second standard conversion sequence either an identity
// conversion or, if the conversion function returns an
// entity of a type that is a derived class of the parameter
// type, a derived-to-base Conversion.
ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion;
ICS->UserDefined.Before = Best->Conversions[0].Standard;
ICS->UserDefined.After = Best->FinalConversion;
ICS->UserDefined.ConversionFunction = Best->Function;
assert(ICS->UserDefined.After.ReferenceBinding &&
ICS->UserDefined.After.DirectBinding &&
"Expected a direct reference binding!");
return false;
} else {
// Perform the conversion.
// FIXME: Binding to a subobject of the lvalue is going to require
// more AST annotation than this.
ImpCastExprToType(Init, T1, /*isLvalue=*/true);
}
break;
case OR_Ambiguous:
assert(false && "Ambiguous reference binding conversions not implemented.");
return true;
case OR_No_Viable_Function:
case OR_Deleted:
// There was no suitable conversion, or we found a deleted
// conversion; continue with other checks.
break;
}
}
if (BindsDirectly) {
// C++ [dcl.init.ref]p4:
// [...] In all cases where the reference-related or
// reference-compatible relationship of two types is used to
// establish the validity of a reference binding, and T1 is a
// base class of T2, a program that necessitates such a binding
// is ill-formed if T1 is an inaccessible (clause 11) or
// ambiguous (10.2) base class of T2.
//
// Note that we only check this condition when we're allowed to
// complain about errors, because we should not be checking for
// ambiguity (or inaccessibility) unless the reference binding
// actually happens.
if (DerivedToBase)
return CheckDerivedToBaseConversion(T2, T1,
Init->getSourceRange().getBegin(),
Init->getSourceRange());
else
return false;
}
// -- Otherwise, the reference shall be to a non-volatile const
// type (i.e., cv1 shall be const).
if (T1.getCVRQualifiers() != QualType::Const) {
if (!ICS)
Diag(Init->getSourceRange().getBegin(),
diag::err_not_reference_to_const_init)
<< T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value")
<< T2 << Init->getSourceRange();
return true;
}
// -- If the initializer expression is an rvalue, with T2 a
// class type, and “cv1 T1” is reference-compatible with
// “cv2 T2,” the reference is bound in one of the
// following ways (the choice is implementation-defined):
//
// -- The reference is bound to the object represented by
// the rvalue (see 3.10) or to a sub-object within that
// object.
//
// -- A temporary of type “cv1 T2” [sic] is created, and
// a constructor is called to copy the entire rvalue
// object into the temporary. The reference is bound to
// the temporary or to a sub-object within the
// temporary.
//
// The constructor that would be used to make the copy
// shall be callable whether or not the copy is actually
// done.
//
// Note that C++0x [dcl.ref.init]p5 takes away this implementation
// freedom, so we will always take the first option and never build
// a temporary in this case. FIXME: We will, however, have to check
// for the presence of a copy constructor in C++98/03 mode.
if (InitLvalue != Expr::LV_Valid && T2->isRecordType() &&
RefRelationship >= Ref_Compatible_With_Added_Qualification) {
if (ICS) {
ICS->ConversionKind = ImplicitConversionSequence::StandardConversion;
ICS->Standard.First = ICK_Identity;
ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity;
ICS->Standard.Third = ICK_Identity;
ICS->Standard.FromTypePtr = T2.getAsOpaquePtr();
ICS->Standard.ToTypePtr = T1.getAsOpaquePtr();
ICS->Standard.ReferenceBinding = true;
ICS->Standard.DirectBinding = false;
} else {
// FIXME: Binding to a subobject of the rvalue is going to require
// more AST annotation than this.
ImpCastExprToType(Init, T1, /*isLvalue=*/true);
}
return false;
}
// -- Otherwise, a temporary of type “cv1 T1” is created and
// initialized from the initializer expression using the
// rules for a non-reference copy initialization (8.5). The
// reference is then bound to the temporary. If T1 is
// reference-related to T2, cv1 must be the same
// cv-qualification as, or greater cv-qualification than,
// cv2; otherwise, the program is ill-formed.
if (RefRelationship == Ref_Related) {
// If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then
// we would be reference-compatible or reference-compatible with
// added qualification. But that wasn't the case, so the reference
// initialization fails.
if (!ICS)
Diag(Init->getSourceRange().getBegin(),
diag::err_reference_init_drops_quals)
<< T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value")
<< T2 << Init->getSourceRange();
return true;
}
// If at least one of the types is a class type, the types are not
// related, and we aren't allowed any user conversions, the
// reference binding fails. This case is important for breaking
// recursion, since TryImplicitConversion below will attempt to
// create a temporary through the use of a copy constructor.
if (SuppressUserConversions && RefRelationship == Ref_Incompatible &&
(T1->isRecordType() || T2->isRecordType())) {
if (!ICS)
Diag(Init->getSourceRange().getBegin(),
diag::err_typecheck_convert_incompatible)
<< DeclType << Init->getType() << "initializing" << Init->getSourceRange();
return true;
}
// Actually try to convert the initializer to T1.
if (ICS) {
/// C++ [over.ics.ref]p2:
///
/// When a parameter of reference type is not bound directly to
/// an argument expression, the conversion sequence is the one
/// required to convert the argument expression to the
/// underlying type of the reference according to
/// 13.3.3.1. Conceptually, this conversion sequence corresponds
/// to copy-initializing a temporary of the underlying type with
/// the argument expression. Any difference in top-level
/// cv-qualification is subsumed by the initialization itself
/// and does not constitute a conversion.
*ICS = TryImplicitConversion(Init, T1, SuppressUserConversions);
return ICS->ConversionKind == ImplicitConversionSequence::BadConversion;
} else {
return PerformImplicitConversion(Init, T1, "initializing");
}
}
/// CheckOverloadedOperatorDeclaration - Check whether the declaration
/// of this overloaded operator is well-formed. If so, returns false;
/// otherwise, emits appropriate diagnostics and returns true.
bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
assert(FnDecl && FnDecl->isOverloadedOperator() &&
"Expected an overloaded operator declaration");
OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
// C++ [over.oper]p5:
// The allocation and deallocation functions, operator new,
// operator new[], operator delete and operator delete[], are
// described completely in 3.7.3. The attributes and restrictions
// found in the rest of this subclause do not apply to them unless
// explicitly stated in 3.7.3.
// FIXME: Write a separate routine for checking this. For now, just
// allow it.
if (Op == OO_New || Op == OO_Array_New ||
Op == OO_Delete || Op == OO_Array_Delete)
return false;
// C++ [over.oper]p6:
// An operator function shall either be a non-static member
// function or be a non-member function and have at least one
// parameter whose type is a class, a reference to a class, an
// enumeration, or a reference to an enumeration.
if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
if (MethodDecl->isStatic())
return Diag(FnDecl->getLocation(),
diag::err_operator_overload_static) << FnDecl->getDeclName();
} else {
bool ClassOrEnumParam = false;
for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
ParamEnd = FnDecl->param_end();
Param != ParamEnd; ++Param) {
QualType ParamType = (*Param)->getType().getNonReferenceType();
if (ParamType->isRecordType() || ParamType->isEnumeralType()) {
ClassOrEnumParam = true;
break;
}
}
if (!ClassOrEnumParam)
return Diag(FnDecl->getLocation(),
diag::err_operator_overload_needs_class_or_enum)
<< FnDecl->getDeclName();
}
// C++ [over.oper]p8:
// An operator function cannot have default arguments (8.3.6),
// except where explicitly stated below.
//
// Only the function-call operator allows default arguments
// (C++ [over.call]p1).
if (Op != OO_Call) {
for (FunctionDecl::param_iterator Param = FnDecl->param_begin();
Param != FnDecl->param_end(); ++Param) {
if ((*Param)->hasUnparsedDefaultArg())
return Diag((*Param)->getLocation(),
diag::err_operator_overload_default_arg)
<< FnDecl->getDeclName();
else if (Expr *DefArg = (*Param)->getDefaultArg())
return Diag((*Param)->getLocation(),
diag::err_operator_overload_default_arg)
<< FnDecl->getDeclName() << DefArg->getSourceRange();
}
}
static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
{ false, false, false }
#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
, { Unary, Binary, MemberOnly }
#include "clang/Basic/OperatorKinds.def"
};
bool CanBeUnaryOperator = OperatorUses[Op][0];
bool CanBeBinaryOperator = OperatorUses[Op][1];
bool MustBeMemberOperator = OperatorUses[Op][2];
// C++ [over.oper]p8:
// [...] Operator functions cannot have more or fewer parameters
// than the number required for the corresponding operator, as
// described in the rest of this subclause.
unsigned NumParams = FnDecl->getNumParams()
+ (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
if (Op != OO_Call &&
((NumParams == 1 && !CanBeUnaryOperator) ||
(NumParams == 2 && !CanBeBinaryOperator) ||
(NumParams < 1) || (NumParams > 2))) {
// We have the wrong number of parameters.
unsigned ErrorKind;
if (CanBeUnaryOperator && CanBeBinaryOperator) {
ErrorKind = 2; // 2 -> unary or binary.
} else if (CanBeUnaryOperator) {
ErrorKind = 0; // 0 -> unary
} else {
assert(CanBeBinaryOperator &&
"All non-call overloaded operators are unary or binary!");
ErrorKind = 1; // 1 -> binary
}
return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
<< FnDecl->getDeclName() << NumParams << ErrorKind;
}
// Overloaded operators other than operator() cannot be variadic.
if (Op != OO_Call &&
FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) {
return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
<< FnDecl->getDeclName();
}
// Some operators must be non-static member functions.
if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
return Diag(FnDecl->getLocation(),
diag::err_operator_overload_must_be_member)
<< FnDecl->getDeclName();
}
// C++ [over.inc]p1:
// The user-defined function called operator++ implements the
// prefix and postfix ++ operator. If this function is a member
// function with no parameters, or a non-member function with one
// parameter of class or enumeration type, it defines the prefix
// increment operator ++ for objects of that type. If the function
// is a member function with one parameter (which shall be of type
// int) or a non-member function with two parameters (the second
// of which shall be of type int), it defines the postfix
// increment operator ++ for objects of that type.
if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
bool ParamIsInt = false;
if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType())
ParamIsInt = BT->getKind() == BuiltinType::Int;
if (!ParamIsInt)
return Diag(LastParam->getLocation(),
diag::err_operator_overload_post_incdec_must_be_int)
<< LastParam->getType() << (Op == OO_MinusMinus);
}
// Notify the class if it got an assignment operator.
if (Op == OO_Equal) {
// Would have returned earlier otherwise.
assert(isa<CXXMethodDecl>(FnDecl) &&
"Overloaded = not member, but not filtered.");
CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl);
Method->getParent()->addedAssignmentOperator(Context, Method);
}
return false;
}
/// ActOnStartLinkageSpecification - Parsed the beginning of a C++
/// linkage specification, including the language and (if present)
/// the '{'. ExternLoc is the location of the 'extern', LangLoc is
/// the location of the language string literal, which is provided
/// by Lang/StrSize. LBraceLoc, if valid, provides the location of
/// the '{' brace. Otherwise, this linkage specification does not
/// have any braces.
Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S,
SourceLocation ExternLoc,
SourceLocation LangLoc,
const char *Lang,
unsigned StrSize,
SourceLocation LBraceLoc) {
LinkageSpecDecl::LanguageIDs Language;
if (strncmp(Lang, "\"C\"", StrSize) == 0)
Language = LinkageSpecDecl::lang_c;
else if (strncmp(Lang, "\"C++\"", StrSize) == 0)
Language = LinkageSpecDecl::lang_cxx;
else {
Diag(LangLoc, diag::err_bad_language);
return 0;
}
// FIXME: Add all the various semantics of linkage specifications
LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext,
LangLoc, Language,
LBraceLoc.isValid());
CurContext->addDecl(D);
PushDeclContext(S, D);
return D;
}
/// ActOnFinishLinkageSpecification - Completely the definition of
/// the C++ linkage specification LinkageSpec. If RBraceLoc is
/// valid, it's the position of the closing '}' brace in a linkage
/// specification that uses braces.
Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S,
DeclTy *LinkageSpec,
SourceLocation RBraceLoc) {
if (LinkageSpec)
PopDeclContext();
return LinkageSpec;
}
/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
/// handler.
Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D)
{
QualType ExDeclType = GetTypeForDeclarator(D, S);
SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin();
bool Invalid = false;
// Arrays and functions decay.
if (ExDeclType->isArrayType())
ExDeclType = Context.getArrayDecayedType(ExDeclType);
else if (ExDeclType->isFunctionType())
ExDeclType = Context.getPointerType(ExDeclType);
// C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
// The exception-declaration shall not denote a pointer or reference to an
// incomplete type, other than [cv] void*.
QualType BaseType = ExDeclType;
int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
unsigned DK = diag::err_catch_incomplete;
if (const PointerType *Ptr = BaseType->getAsPointerType()) {
BaseType = Ptr->getPointeeType();
Mode = 1;
DK = diag::err_catch_incomplete_ptr;
} else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) {
BaseType = Ref->getPointeeType();
Mode = 2;
DK = diag::err_catch_incomplete_ref;
}
if ((Mode == 0 || !BaseType->isVoidType()) &&
RequireCompleteType(Begin, BaseType, DK))
Invalid = true;
// FIXME: Need to test for ability to copy-construct and destroy the
// exception variable.
// FIXME: Need to check for abstract classes.
IdentifierInfo *II = D.getIdentifier();
if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) {
// The scope should be freshly made just for us. There is just no way
// it contains any previous declaration.
assert(!S->isDeclScope(PrevDecl));
if (PrevDecl->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
}
}
VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(),
II, ExDeclType, VarDecl::None, Begin);
if (D.getInvalidType() || Invalid)
ExDecl->setInvalidDecl();
if (D.getCXXScopeSpec().isSet()) {
Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
<< D.getCXXScopeSpec().getRange();
ExDecl->setInvalidDecl();
}
// Add the exception declaration into this scope.
S->AddDecl(ExDecl);
if (II)
IdResolver.AddDecl(ExDecl);
ProcessDeclAttributes(ExDecl, D);
return ExDecl;
}
Sema::DeclTy *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc,
ExprArg assertexpr,
ExprArg assertmessageexpr) {
Expr *AssertExpr = (Expr *)assertexpr.get();
StringLiteral *AssertMessage =
cast<StringLiteral>((Expr *)assertmessageexpr.get());
if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) {
llvm::APSInt Value(32);
if (!AssertExpr->isIntegerConstantExpr(Value, Context)) {
Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) <<
AssertExpr->getSourceRange();
return 0;
}
if (Value == 0) {
std::string str(AssertMessage->getStrData(),
AssertMessage->getByteLength());
Diag(AssertLoc, diag::err_static_assert_failed)
<< str << AssertExpr->getSourceRange();
}
}
assertexpr.release();
assertmessageexpr.release();
Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc,
AssertExpr, AssertMessage);
CurContext->addDecl(Decl);
return Decl;
}
Reference in New Issue View Git Blame Copy Permalink