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

5691 lines
224 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 "SemaInit.h"
#include "Lookup.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/AST/TypeLoc.h"
#include "clang/AST/TypeOrdering.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Parse/DeclSpec.h"
#include "clang/Parse/Template.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/STLExtras.h"
#include <map>
#include <set>
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 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();
}
}
bool
Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg,
SourceLocation EqualLoc) {
QualType ParamType = Param->getType();
if (RequireCompleteType(Param->getLocation(), Param->getType(),
diag::err_typecheck_decl_incomplete_type)) {
Param->setInvalidDecl();
return true;
}
Expr *Arg = (Expr *)DefaultArg.get();
// 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).
InitializedEntity Entity = InitializedEntity::InitializeParameter(Param);
InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
EqualLoc);
if (CheckInitializerTypes(Arg, ParamType, Entity, Kind))
return true;
Arg = MaybeCreateCXXExprWithTemporaries(Arg);
// Okay: add the default argument to the parameter
Param->setDefaultArg(Arg);
DefaultArg.release();
return false;
}
/// 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(DeclPtrTy param, SourceLocation EqualLoc,
ExprArg defarg) {
if (!param || !defarg.get())
return;
ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
UnparsedDefaultArgLocs.erase(Param);
ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>());
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;
}
// Check that the default argument is well-formed
CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this);
if (DefaultArgChecker.Visit(DefaultArg.get())) {
Param->setInvalidDecl();
return;
}
SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc);
}
/// 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(DeclPtrTy param,
SourceLocation EqualLoc,
SourceLocation ArgLoc) {
if (!param)
return;
ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
if (Param)
Param->setUnparsedDefaultArg();
UnparsedDefaultArgLocs[Param] = ArgLoc;
}
/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
/// the default argument for the parameter param failed.
void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) {
if (!param)
return;
ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
Param->setInvalidDecl();
UnparsedDefaultArgLocs.erase(Param);
}
/// 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, e = D.getNumTypeObjects(); i != e; ++i) {
DeclaratorChunk &chunk = D.getTypeObject(i);
if (chunk.Kind == DeclaratorChunk::Function) {
for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) {
ParmVarDecl *Param =
cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>());
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).
//
// C++ [dcl.fct.default]p6:
// Except for member functions of class templates, the default arguments
// in a member function definition that appears outside of the class
// definition are added to the set of default arguments provided by the
// member function declaration in the class definition.
for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) {
ParmVarDecl *OldParam = Old->getParamDecl(p);
ParmVarDecl *NewParam = New->getParamDecl(p);
if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) {
// FIXME: If the parameter doesn't have an identifier then the location
// points to the '=' which means that the fixit hint won't remove any
// extra spaces between the type and the '='.
SourceLocation Begin = NewParam->getLocation();
if (NewParam->getIdentifier())
Begin = PP.getLocForEndOfToken(Begin);
Diag(NewParam->getLocation(),
diag::err_param_default_argument_redefinition)
<< NewParam->getDefaultArgRange()
<< CodeModificationHint::CreateRemoval(SourceRange(Begin,
NewParam->getLocEnd()));
// Look for the function declaration where the default argument was
// actually written, which may be a declaration prior to Old.
for (FunctionDecl *Older = Old->getPreviousDeclaration();
Older; Older = Older->getPreviousDeclaration()) {
if (!Older->getParamDecl(p)->hasDefaultArg())
break;
OldParam = Older->getParamDecl(p);
}
Diag(OldParam->getLocation(), diag::note_previous_definition)
<< OldParam->getDefaultArgRange();
Invalid = true;
} else if (OldParam->hasDefaultArg()) {
// Merge the old default argument into the new parameter
if (OldParam->hasUninstantiatedDefaultArg())
NewParam->setUninstantiatedDefaultArg(
OldParam->getUninstantiatedDefaultArg());
else
NewParam->setDefaultArg(OldParam->getDefaultArg());
} else if (NewParam->hasDefaultArg()) {
if (New->getDescribedFunctionTemplate()) {
// Paragraph 4, quoted above, only applies to non-template functions.
Diag(NewParam->getLocation(),
diag::err_param_default_argument_template_redecl)
<< NewParam->getDefaultArgRange();
Diag(Old->getLocation(), diag::note_template_prev_declaration)
<< false;
} else if (New->getTemplateSpecializationKind()
!= TSK_ImplicitInstantiation &&
New->getTemplateSpecializationKind() != TSK_Undeclared) {
// C++ [temp.expr.spec]p21:
// Default function arguments shall not be specified in a declaration
// or a definition for one of the following explicit specializations:
// - the explicit specialization of a function template;
// - the explicit specialization of a member function template;
// - the explicit specialization of a member function of a class
// template where the class template specialization to which the
// member function specialization belongs is implicitly
// instantiated.
Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
<< (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
<< New->getDeclName()
<< NewParam->getDefaultArgRange();
} else if (New->getDeclContext()->isDependentContext()) {
// C++ [dcl.fct.default]p6 (DR217):
// Default arguments for a member function of a class template shall
// be specified on the initial declaration of the member function
// within the class template.
//
// Reading the tea leaves a bit in DR217 and its reference to DR205
// leads me to the conclusion that one cannot add default function
// arguments for an out-of-line definition of a member function of a
// dependent type.
int WhichKind = 2;
if (CXXRecordDecl *Record
= dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
if (Record->getDescribedClassTemplate())
WhichKind = 0;
else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
WhichKind = 1;
else
WhichKind = 2;
}
Diag(NewParam->getLocation(),
diag::err_param_default_argument_member_template_redecl)
<< WhichKind
<< NewParam->getDefaultArgRange();
}
}
}
if (CheckEquivalentExceptionSpec(
Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(),
New->getType()->getAs<FunctionProtoType>(), New->getLocation()))
Invalid = true;
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->hasDefaultArg())
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->hasDefaultArg()) {
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->hasDefaultArg()) {
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 && SS->isSet() && !SS->isInvalid()) {
DeclContext *DC = computeDeclContext(*SS, true);
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 (Context) 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,
PDiag(diag::err_incomplete_base_class)
<< SpecifierRange))
return 0;
// If the base class is polymorphic or isn't empty, the new one is/isn't, too.
RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
assert(BaseDecl && "Record type has no declaration");
BaseDecl = BaseDecl->getDefinition(Context);
assert(BaseDecl && "Base type is not incomplete, but has no definition");
CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
assert(CXXBaseDecl && "Base type is not a C++ type");
// C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases.
if (CXXBaseDecl->hasAttr<FinalAttr>()) {
Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString();
Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl)
<< BaseType;
return 0;
}
SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual);
// Create the base specifier.
// FIXME: Allocate via ASTContext?
return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
Class->getTagKind() == RecordDecl::TK_class,
Access, BaseType);
}
void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class,
const CXXRecordDecl *BaseClass,
bool BaseIsVirtual) {
// A class with a non-empty base class is not empty.
// FIXME: Standard ref?
if (!BaseClass->isEmpty())
Class->setEmpty(false);
// C++ [class.virtual]p1:
// A class that [...] inherits a virtual function is called a polymorphic
// class.
if (BaseClass->isPolymorphic())
Class->setPolymorphic(true);
// C++ [dcl.init.aggr]p1:
// An aggregate is [...] a class with [...] no base classes [...].
Class->setAggregate(false);
// C++ [class]p4:
// A POD-struct is an aggregate class...
Class->setPOD(false);
if (BaseIsVirtual) {
// C++ [class.ctor]p5:
// A constructor is trivial if its class has no virtual base classes.
Class->setHasTrivialConstructor(false);
// C++ [class.copy]p6:
// A copy constructor is trivial if its class has no virtual base classes.
Class->setHasTrivialCopyConstructor(false);
// C++ [class.copy]p11:
// A copy assignment operator is trivial if its class has no virtual
// base classes.
Class->setHasTrivialCopyAssignment(false);
// C++0x [meta.unary.prop] is_empty:
// T is a class type, but not a union type, with ... no virtual base
// classes
Class->setEmpty(false);
} else {
// C++ [class.ctor]p5:
// A constructor is trivial if all the direct base classes of its
// class have trivial constructors.
if (!BaseClass->hasTrivialConstructor())
Class->setHasTrivialConstructor(false);
// C++ [class.copy]p6:
// A copy constructor is trivial if all the direct base classes of its
// class have trivial copy constructors.
if (!BaseClass->hasTrivialCopyConstructor())
Class->setHasTrivialCopyConstructor(false);
// C++ [class.copy]p11:
// A copy assignment operator is trivial if all the direct base classes
// of its class have trivial copy assignment operators.
if (!BaseClass->hasTrivialCopyAssignment())
Class->setHasTrivialCopyAssignment(false);
}
// C++ [class.ctor]p3:
// A destructor is trivial if all the direct base classes of its class
// have trivial destructors.
if (!BaseClass->hasTrivialDestructor())
Class->setHasTrivialDestructor(false);
}
/// 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(DeclPtrTy classdecl, SourceRange SpecifierRange,
bool Virtual, AccessSpecifier Access,
TypeTy *basetype, SourceLocation BaseLoc) {
if (!classdecl)
return true;
AdjustDeclIfTemplate(classdecl);
CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>());
QualType BaseType = GetTypeFromParser(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.getLocalUnqualifiedType();
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.
Context.Deallocate(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(Context, 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)
Context.Deallocate(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(DeclPtrTy ClassDecl, BaseTy **Bases,
unsigned NumBases) {
if (!ClassDecl || !Bases || !NumBases)
return;
AdjustDeclIfTemplate(ClassDecl);
AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()),
(CXXBaseSpecifier**)(Bases), NumBases);
}
/// \brief Determine whether the type \p Derived is a C++ class that is
/// derived from the type \p Base.
bool Sema::IsDerivedFrom(QualType Derived, QualType Base) {
if (!getLangOptions().CPlusPlus)
return false;
const RecordType *DerivedRT = Derived->getAs<RecordType>();
if (!DerivedRT)
return false;
const RecordType *BaseRT = Base->getAs<RecordType>();
if (!BaseRT)
return false;
CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl());
CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
return DerivedRD->isDerivedFrom(BaseRD);
}
/// \brief Determine whether the type \p Derived is a C++ class that is
/// derived from the type \p Base.
bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) {
if (!getLangOptions().CPlusPlus)
return false;
const RecordType *DerivedRT = Derived->getAs<RecordType>();
if (!DerivedRT)
return false;
const RecordType *BaseRT = Base->getAs<RecordType>();
if (!BaseRT)
return false;
CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl());
CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
return DerivedRD->isDerivedFrom(BaseRD, Paths);
}
/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
/// conversion (where Derived and Base are class types) is
/// well-formed, meaning that the conversion is unambiguous (and
/// that all of the base classes are accessible). Returns true
/// and emits a diagnostic if the code is ill-formed, returns false
/// otherwise. Loc is the location where this routine should point to
/// if there is an error, and Range is the source range to highlight
/// if there is an error.
bool
Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
unsigned InaccessibleBaseID,
unsigned AmbigiousBaseConvID,
SourceLocation Loc, SourceRange Range,
DeclarationName Name) {
// First, determine whether the path from Derived to Base is
// ambiguous. This is slightly more expensive than checking whether
// the Derived to Base conversion exists, because here we need to
// explore multiple paths to determine if there is an ambiguity.
CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
/*DetectVirtual=*/false);
bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths);
assert(DerivationOkay &&
"Can only be used with a derived-to-base conversion");
(void)DerivationOkay;
if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) {
if (InaccessibleBaseID == 0)
return false;
// Check that the base class can be accessed.
return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc,
Name);
}
// We know that the derived-to-base conversion is ambiguous, and
// we're going to produce a diagnostic. Perform the derived-to-base
// search just one more time to compute all of the possible paths so
// that we can print them out. This is more expensive than any of
// the previous derived-to-base checks we've done, but at this point
// performance isn't as much of an issue.
Paths.clear();
Paths.setRecordingPaths(true);
bool StillOkay = IsDerivedFrom(Derived, Base, Paths);
assert(StillOkay && "Can only be used with a derived-to-base conversion");
(void)StillOkay;
// Build up a textual representation of the ambiguous paths, e.g.,
// D -> B -> A, that will be used to illustrate the ambiguous
// conversions in the diagnostic. We only print one of the paths
// to each base class subobject.
std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
Diag(Loc, AmbigiousBaseConvID)
<< Derived << Base << PathDisplayStr << Range << Name;
return true;
}
bool
Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
SourceLocation Loc, SourceRange Range,
bool IgnoreAccess) {
return CheckDerivedToBaseConversion(Derived, Base,
IgnoreAccess ? 0 :
diag::err_conv_to_inaccessible_base,
diag::err_ambiguous_derived_to_base_conv,
Loc, Range, DeclarationName());
}
/// @brief Builds a string representing ambiguous paths from a
/// specific derived class to different subobjects of the same base
/// class.
///
/// This function builds a string that can be used in error messages
/// to show the different paths that one can take through the
/// inheritance hierarchy to go from the derived class to different
/// subobjects of a base class. The result looks something like this:
/// @code
/// struct D -> struct B -> struct A
/// struct D -> struct C -> struct A
/// @endcode
std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
std::string PathDisplayStr;
std::set<unsigned> DisplayedPaths;
for (CXXBasePaths::paths_iterator Path = Paths.begin();
Path != Paths.end(); ++Path) {
if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
// We haven't displayed a path to this particular base
// class subobject yet.
PathDisplayStr += "\n ";
PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
for (CXXBasePath::const_iterator Element = Path->begin();
Element != Path->end(); ++Element)
PathDisplayStr += " -> " + Element->Base->getType().getAsString();
}
}
return PathDisplayStr;
}
//===----------------------------------------------------------------------===//
// 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.
Sema::DeclPtrTy
Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
MultiTemplateParamsArg TemplateParameterLists,
ExprTy *BW, ExprTy *InitExpr, bool IsDefinition,
bool Deleted) {
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();
assert(!DS.isFriendSpecified());
// 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 = GetTypeFromParser(DS.getTypeRep());
isFunc = TDType->isFunctionType();
}
bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
!isFunc);
Decl *Member;
if (isInstField) {
// FIXME: Check for template parameters!
Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth,
AS);
assert(Member && "HandleField never returns null");
} else {
Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition)
.getAs<Decl>();
if (!Member) {
if (BitWidth) DeleteExpr(BitWidth);
return DeclPtrTy();
}
// 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);
// If we have declared a member function template, set the access of the
// templated declaration as well.
if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
FunTmpl->getTemplatedDecl()->setAccess(AS);
}
assert((Name || isInstField) && "No identifier for non-field ?");
if (Init)
AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false);
if (Deleted) // FIXME: Source location is not very good.
SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin());
if (isInstField) {
FieldCollector->Add(cast<FieldDecl>(Member));
return DeclPtrTy();
}
return DeclPtrTy::make(Member);
}
/// ActOnMemInitializer - Handle a C++ member initializer.
Sema::MemInitResult
Sema::ActOnMemInitializer(DeclPtrTy ConstructorD,
Scope *S,
const CXXScopeSpec &SS,
IdentifierInfo *MemberOrBase,
TypeTy *TemplateTypeTy,
SourceLocation IdLoc,
SourceLocation LParenLoc,
ExprTy **Args, unsigned NumArgs,
SourceLocation *CommaLocs,
SourceLocation RParenLoc) {
if (!ConstructorD)
return true;
AdjustDeclIfTemplate(ConstructorD);
CXXConstructorDecl *Constructor
= dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>());
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
// constructors class and, if not found in that scope, are looked
// up in the scope containing the constructors
// definition. [Note: if the constructors 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. ]
if (!SS.getScopeRep() && !TemplateTypeTy) {
// 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)
return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc,
LParenLoc, RParenLoc);
}
// It didn't name a member, so see if it names a class.
QualType BaseType;
TypeSourceInfo *TInfo = 0;
if (TemplateTypeTy)
BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
else
BaseType = QualType::getFromOpaquePtr(getTypeName(*MemberOrBase, IdLoc,
S, &SS));
if (BaseType.isNull())
return Diag(IdLoc, diag::err_mem_init_not_member_or_class)
<< MemberOrBase << SourceRange(IdLoc, RParenLoc);
if (!TInfo)
TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs,
LParenLoc, RParenLoc, ClassDecl);
}
/// Checks an initializer expression for use of uninitialized fields, such as
/// containing the field that is being initialized. Returns true if there is an
/// uninitialized field was used an updates the SourceLocation parameter; false
/// otherwise.
static bool InitExprContainsUninitializedFields(const Stmt* S,
const FieldDecl* LhsField,
SourceLocation* L) {
const MemberExpr* ME = dyn_cast<MemberExpr>(S);
if (ME) {
const NamedDecl* RhsField = ME->getMemberDecl();
if (RhsField == LhsField) {
// Initializing a field with itself. Throw a warning.
// But wait; there are exceptions!
// Exception #1: The field may not belong to this record.
// e.g. Foo(const Foo& rhs) : A(rhs.A) {}
const Expr* base = ME->getBase();
if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) {
// Even though the field matches, it does not belong to this record.
return false;
}
// None of the exceptions triggered; return true to indicate an
// uninitialized field was used.
*L = ME->getMemberLoc();
return true;
}
}
bool found = false;
for (Stmt::const_child_iterator it = S->child_begin();
it != S->child_end() && found == false;
++it) {
if (isa<CallExpr>(S)) {
// Do not descend into function calls or constructors, as the use
// of an uninitialized field may be valid. One would have to inspect
// the contents of the function/ctor to determine if it is safe or not.
// i.e. Pass-by-value is never safe, but pass-by-reference and pointers
// may be safe, depending on what the function/ctor does.
continue;
}
found = InitExprContainsUninitializedFields(*it, LhsField, L);
}
return found;
}
Sema::MemInitResult
Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args,
unsigned NumArgs, SourceLocation IdLoc,
SourceLocation LParenLoc,
SourceLocation RParenLoc) {
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
ExprTemporaries.clear();
// Diagnose value-uses of fields to initialize themselves, e.g.
// foo(foo)
// where foo is not also a parameter to the constructor.
// TODO: implement -Wuninitialized and fold this into that framework.
for (unsigned i = 0; i < NumArgs; ++i) {
SourceLocation L;
if (InitExprContainsUninitializedFields(Args[i], Member, &L)) {
// FIXME: Return true in the case when other fields are used before being
// uninitialized. For example, let this field be the i'th field. When
// initializing the i'th field, throw a warning if any of the >= i'th
// fields are used, as they are not yet initialized.
// Right now we are only handling the case where the i'th field uses
// itself in its initializer.
Diag(L, diag::warn_field_is_uninit);
}
}
bool HasDependentArg = false;
for (unsigned i = 0; i < NumArgs; i++)
HasDependentArg |= Args[i]->isTypeDependent();
CXXConstructorDecl *C = 0;
QualType FieldType = Member->getType();
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (FieldType->isDependentType()) {
// Can't check init for dependent type.
} else if (FieldType->isRecordType()) {
// Member is a record (struct/union/class), so pass the initializer
// arguments down to the record's constructor.
if (!HasDependentArg) {
ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
C = PerformInitializationByConstructor(FieldType,
MultiExprArg(*this,
(void**)Args,
NumArgs),
IdLoc,
SourceRange(IdLoc, RParenLoc),
Member->getDeclName(),
InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc),
ConstructorArgs);
if (C) {
// Take over the constructor arguments as our own.
NumArgs = ConstructorArgs.size();
Args = (Expr **)ConstructorArgs.take();
}
}
} else if (NumArgs != 1 && NumArgs != 0) {
// The member type is not a record type (or an array of record
// types), so it can be only be default- or copy-initialized.
return Diag(IdLoc, diag::err_mem_initializer_mismatch)
<< Member->getDeclName() << SourceRange(IdLoc, RParenLoc);
} else if (!HasDependentArg) {
Expr *NewExp;
if (NumArgs == 0) {
if (FieldType->isReferenceType()) {
Diag(IdLoc, diag::err_null_intialized_reference_member)
<< Member->getDeclName();
return Diag(Member->getLocation(), diag::note_declared_at);
}
NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc);
NumArgs = 1;
}
else
NewExp = (Expr*)Args[0];
if (PerformCopyInitialization(NewExp, FieldType, AA_Passing))
return true;
Args[0] = NewExp;
}
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
ExprTemporaries.clear();
// FIXME: Perform direct initialization of the member.
return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc,
C, LParenLoc, (Expr **)Args,
NumArgs, RParenLoc);
}
Sema::MemInitResult
Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
Expr **Args, unsigned NumArgs,
SourceLocation LParenLoc, SourceLocation RParenLoc,
CXXRecordDecl *ClassDecl) {
bool HasDependentArg = false;
for (unsigned i = 0; i < NumArgs; i++)
HasDependentArg |= Args[i]->isTypeDependent();
SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin();
if (!BaseType->isDependentType()) {
if (!BaseType->isRecordType())
return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
<< BaseType << BaseTInfo->getTypeLoc().getSourceRange();
// C++ [class.base.init]p2:
// [...] Unless the mem-initializer-id names a nonstatic data
// member of the constructors 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.hasSameUnqualifiedType(BaseType, Base->getType())) {
// 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.
CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
/*DetectVirtual=*/false);
if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) {
for (CXXBasePaths::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(BaseLoc, diag::err_base_init_direct_and_virtual)
<< BaseType << BaseTInfo->getTypeLoc().getSourceRange();
// C++ [base.class.init]p2:
// Unless the mem-initializer-id names a nonstatic data membeer of the
// constructor's class ot a direst or virtual base of that class, the
// mem-initializer is ill-formed.
if (!DirectBaseSpec && !VirtualBaseSpec)
return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
<< BaseType << ClassDecl->getNameAsCString()
<< BaseTInfo->getTypeLoc().getSourceRange();
}
CXXConstructorDecl *C = 0;
if (!BaseType->isDependentType() && !HasDependentArg) {
DeclarationName Name = Context.DeclarationNames.getCXXConstructorName(
Context.getCanonicalType(BaseType).getUnqualifiedType());
ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
C = PerformInitializationByConstructor(BaseType,
MultiExprArg(*this,
(void**)Args, NumArgs),
BaseLoc,
SourceRange(BaseLoc, RParenLoc),
Name,
InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc),
ConstructorArgs);
if (C) {
// Take over the constructor arguments as our own.
NumArgs = ConstructorArgs.size();
Args = (Expr **)ConstructorArgs.take();
}
}
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
ExprTemporaries.clear();
return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, C,
LParenLoc, (Expr **)Args,
NumArgs, RParenLoc);
}
bool
Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor,
CXXBaseOrMemberInitializer **Initializers,
unsigned NumInitializers,
bool IsImplicitConstructor) {
// We need to build the initializer AST according to order of construction
// and not what user specified in the Initializers list.
CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext());
llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit;
llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields;
bool HasDependentBaseInit = false;
bool HadError = false;
for (unsigned i = 0; i < NumInitializers; i++) {
CXXBaseOrMemberInitializer *Member = Initializers[i];
if (Member->isBaseInitializer()) {
if (Member->getBaseClass()->isDependentType())
HasDependentBaseInit = true;
AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
} else {
AllBaseFields[Member->getMember()] = Member;
}
}
if (HasDependentBaseInit) {
// FIXME. This does not preserve the ordering of the initializers.
// Try (with -Wreorder)
// template<class X> struct A {};
// template<class X> struct B : A<X> {
// B() : x1(10), A<X>() {}
// int x1;
// };
// B<int> x;
// On seeing one dependent type, we should essentially exit this routine
// while preserving user-declared initializer list. When this routine is
// called during instantiatiation process, this routine will rebuild the
// ordered initializer list correctly.
// If we have a dependent base initialization, we can't determine the
// association between initializers and bases; just dump the known
// initializers into the list, and don't try to deal with other bases.
for (unsigned i = 0; i < NumInitializers; i++) {
CXXBaseOrMemberInitializer *Member = Initializers[i];
if (Member->isBaseInitializer())
AllToInit.push_back(Member);
}
} else {
// Push virtual bases before others.
for (CXXRecordDecl::base_class_iterator VBase =
ClassDecl->vbases_begin(),
E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
if (VBase->getType()->isDependentType())
continue;
if (CXXBaseOrMemberInitializer *Value
= AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) {
AllToInit.push_back(Value);
}
else {
CXXRecordDecl *VBaseDecl =
cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl());
assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null");
CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context);
if (!Ctor) {
Diag(Constructor->getLocation(), diag::err_missing_default_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 0 << VBase->getType();
Diag(VBaseDecl->getLocation(), diag::note_previous_decl)
<< Context.getTagDeclType(VBaseDecl);
HadError = true;
continue;
}
ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this);
if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0),
Constructor->getLocation(), CtorArgs))
continue;
MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if
// necessary.
// FIXME: Is there any better source-location information we can give?
ExprTemporaries.clear();
CXXBaseOrMemberInitializer *Member =
new (Context) CXXBaseOrMemberInitializer(Context,
Context.getTrivialTypeSourceInfo(VBase->getType(),
SourceLocation()),
Ctor,
SourceLocation(),
CtorArgs.takeAs<Expr>(),
CtorArgs.size(),
SourceLocation());
AllToInit.push_back(Member);
}
}
for (CXXRecordDecl::base_class_iterator Base =
ClassDecl->bases_begin(),
E = ClassDecl->bases_end(); Base != E; ++Base) {
// Virtuals are in the virtual base list and already constructed.
if (Base->isVirtual())
continue;
// Skip dependent types.
if (Base->getType()->isDependentType())
continue;
if (CXXBaseOrMemberInitializer *Value
= AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) {
AllToInit.push_back(Value);
}
else {
CXXRecordDecl *BaseDecl =
cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null");
CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context);
if (!Ctor) {
Diag(Constructor->getLocation(), diag::err_missing_default_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 0 << Base->getType();
Diag(BaseDecl->getLocation(), diag::note_previous_decl)
<< Context.getTagDeclType(BaseDecl);
HadError = true;
continue;
}
ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this);
if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0),
Constructor->getLocation(), CtorArgs))
continue;
MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if
// necessary.
// FIXME: Is there any better source-location information we can give?
ExprTemporaries.clear();
CXXBaseOrMemberInitializer *Member =
new (Context) CXXBaseOrMemberInitializer(Context,
Context.getTrivialTypeSourceInfo(Base->getType(),
SourceLocation()),
Ctor,
SourceLocation(),
CtorArgs.takeAs<Expr>(),
CtorArgs.size(),
SourceLocation());
AllToInit.push_back(Member);
}
}
}
// non-static data members.
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
E = ClassDecl->field_end(); Field != E; ++Field) {
if ((*Field)->isAnonymousStructOrUnion()) {
if (const RecordType *FieldClassType =
Field->getType()->getAs<RecordType>()) {
CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(),
EA = FieldClassDecl->field_end(); FA != EA; FA++) {
if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) {
// 'Member' is the anonymous union field and 'AnonUnionMember' is
// set to the anonymous union data member used in the initializer
// list.
Value->setMember(*Field);
Value->setAnonUnionMember(*FA);
AllToInit.push_back(Value);
break;
}
}
}
continue;
}
if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) {
AllToInit.push_back(Value);
continue;
}
if ((*Field)->getType()->isDependentType())
continue;
QualType FT = Context.getBaseElementType((*Field)->getType());
if (const RecordType* RT = FT->getAs<RecordType>()) {
CXXConstructorDecl *Ctor =
cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context);
if (!Ctor) {
Diag(Constructor->getLocation(), diag::err_missing_default_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 1 << (*Field)->getDeclName();
Diag(Field->getLocation(), diag::note_field_decl);
Diag(RT->getDecl()->getLocation(), diag::note_previous_decl)
<< Context.getTagDeclType(RT->getDecl());
HadError = true;
continue;
}
if (FT.isConstQualified() && Ctor->isTrivial()) {
Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 1 << (*Field)->getDeclName();
Diag((*Field)->getLocation(), diag::note_declared_at);
HadError = true;
}
// Don't create initializers for trivial constructors, since they don't
// actually need to be run.
if (Ctor->isTrivial())
continue;
ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this);
if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0),
Constructor->getLocation(), CtorArgs))
continue;
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
ExprTemporaries.clear();
CXXBaseOrMemberInitializer *Member =
new (Context) CXXBaseOrMemberInitializer(Context,
*Field, SourceLocation(),
Ctor,
SourceLocation(),
CtorArgs.takeAs<Expr>(),
CtorArgs.size(),
SourceLocation());
AllToInit.push_back(Member);
MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
}
else if (FT->isReferenceType()) {
Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 0 << (*Field)->getDeclName();
Diag((*Field)->getLocation(), diag::note_declared_at);
HadError = true;
}
else if (FT.isConstQualified()) {
Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 1 << (*Field)->getDeclName();
Diag((*Field)->getLocation(), diag::note_declared_at);
HadError = true;
}
}
NumInitializers = AllToInit.size();
if (NumInitializers > 0) {
Constructor->setNumBaseOrMemberInitializers(NumInitializers);
CXXBaseOrMemberInitializer **baseOrMemberInitializers =
new (Context) CXXBaseOrMemberInitializer*[NumInitializers];
Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers);
for (unsigned Idx = 0; Idx < NumInitializers; ++Idx)
baseOrMemberInitializers[Idx] = AllToInit[Idx];
}
return HadError;
}
static void *GetKeyForTopLevelField(FieldDecl *Field) {
// For anonymous unions, use the class declaration as the key.
if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
if (RT->getDecl()->isAnonymousStructOrUnion())
return static_cast<void *>(RT->getDecl());
}
return static_cast<void *>(Field);
}
static void *GetKeyForBase(QualType BaseType) {
if (const RecordType *RT = BaseType->getAs<RecordType>())
return (void *)RT;
assert(0 && "Unexpected base type!");
return 0;
}
static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member,
bool MemberMaybeAnon = false) {
// For fields injected into the class via declaration of an anonymous union,
// use its anonymous union class declaration as the unique key.
if (Member->isMemberInitializer()) {
FieldDecl *Field = Member->getMember();
// After SetBaseOrMemberInitializers call, Field is the anonymous union
// data member of the class. Data member used in the initializer list is
// in AnonUnionMember field.
if (MemberMaybeAnon && Field->isAnonymousStructOrUnion())
Field = Member->getAnonUnionMember();
if (Field->getDeclContext()->isRecord()) {
RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext());
if (RD->isAnonymousStructOrUnion())
return static_cast<void *>(RD);
}
return static_cast<void *>(Field);
}
return GetKeyForBase(QualType(Member->getBaseClass(), 0));
}
/// ActOnMemInitializers - Handle the member initializers for a constructor.
void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
SourceLocation ColonLoc,
MemInitTy **MemInits, unsigned NumMemInits) {
if (!ConstructorDecl)
return;
AdjustDeclIfTemplate(ConstructorDecl);
CXXConstructorDecl *Constructor
= dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>());
if (!Constructor) {
Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
return;
}
if (!Constructor->isDependentContext()) {
llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members;
bool err = false;
for (unsigned i = 0; i < NumMemInits; i++) {
CXXBaseOrMemberInitializer *Member =
static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]);
void *KeyToMember = GetKeyForMember(Member);
CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember];
if (!PrevMember) {
PrevMember = Member;
continue;
}
if (FieldDecl *Field = Member->getMember())
Diag(Member->getSourceLocation(),
diag::error_multiple_mem_initialization)
<< Field->getNameAsString()
<< Member->getSourceRange();
else {
Type *BaseClass = Member->getBaseClass();
assert(BaseClass && "ActOnMemInitializers - neither field or base");
Diag(Member->getSourceLocation(),
diag::error_multiple_base_initialization)
<< QualType(BaseClass, 0)
<< Member->getSourceRange();
}
Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer)
<< 0;
err = true;
}
if (err)
return;
}
SetBaseOrMemberInitializers(Constructor,
reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits),
NumMemInits, false);
if (Constructor->isDependentContext())
return;
if (Diags.getDiagnosticLevel(diag::warn_base_initialized) ==
Diagnostic::Ignored &&
Diags.getDiagnosticLevel(diag::warn_field_initialized) ==
Diagnostic::Ignored)
return;
// Also issue warning if order of ctor-initializer list does not match order
// of 1) base class declarations and 2) order of non-static data members.
llvm::SmallVector<const void*, 32> AllBaseOrMembers;
CXXRecordDecl *ClassDecl
= cast<CXXRecordDecl>(Constructor->getDeclContext());
// Push virtual bases before others.
for (CXXRecordDecl::base_class_iterator VBase =
ClassDecl->vbases_begin(),
E = ClassDecl->vbases_end(); VBase != E; ++VBase)
AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType()));
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
E = ClassDecl->bases_end(); Base != E; ++Base) {
// Virtuals are alread in the virtual base list and are constructed
// first.
if (Base->isVirtual())
continue;
AllBaseOrMembers.push_back(GetKeyForBase(Base->getType()));
}
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
E = ClassDecl->field_end(); Field != E; ++Field)
AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field));
int Last = AllBaseOrMembers.size();
int curIndex = 0;
CXXBaseOrMemberInitializer *PrevMember = 0;
for (unsigned i = 0; i < NumMemInits; i++) {
CXXBaseOrMemberInitializer *Member =
static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]);
void *MemberInCtorList = GetKeyForMember(Member, true);
for (; curIndex < Last; curIndex++)
if (MemberInCtorList == AllBaseOrMembers[curIndex])
break;
if (curIndex == Last) {
assert(PrevMember && "Member not in member list?!");
// Initializer as specified in ctor-initializer list is out of order.
// Issue a warning diagnostic.
if (PrevMember->isBaseInitializer()) {
// Diagnostics is for an initialized base class.
Type *BaseClass = PrevMember->getBaseClass();
Diag(PrevMember->getSourceLocation(),
diag::warn_base_initialized)
<< QualType(BaseClass, 0);
} else {
FieldDecl *Field = PrevMember->getMember();
Diag(PrevMember->getSourceLocation(),
diag::warn_field_initialized)
<< Field->getNameAsString();
}
// Also the note!
if (FieldDecl *Field = Member->getMember())
Diag(Member->getSourceLocation(),
diag::note_fieldorbase_initialized_here) << 0
<< Field->getNameAsString();
else {
Type *BaseClass = Member->getBaseClass();
Diag(Member->getSourceLocation(),
diag::note_fieldorbase_initialized_here) << 1
<< QualType(BaseClass, 0);
}
for (curIndex = 0; curIndex < Last; curIndex++)
if (MemberInCtorList == AllBaseOrMembers[curIndex])
break;
}
PrevMember = Member;
}
}
void
Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) {
// Ignore dependent destructors.
if (Destructor->isDependentContext())
return;
CXXRecordDecl *ClassDecl = Destructor->getParent();
// Non-static data members.
for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
E = ClassDecl->field_end(); I != E; ++I) {
FieldDecl *Field = *I;
QualType FieldType = Context.getBaseElementType(Field->getType());
const RecordType* RT = FieldType->getAs<RecordType>();
if (!RT)
continue;
CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
if (FieldClassDecl->hasTrivialDestructor())
continue;
const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context);
MarkDeclarationReferenced(Destructor->getLocation(),
const_cast<CXXDestructorDecl*>(Dtor));
}
// Bases.
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
E = ClassDecl->bases_end(); Base != E; ++Base) {
// Ignore virtual bases.
if (Base->isVirtual())
continue;
// Ignore trivial destructors.
CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
if (BaseClassDecl->hasTrivialDestructor())
continue;
const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context);
MarkDeclarationReferenced(Destructor->getLocation(),
const_cast<CXXDestructorDecl*>(Dtor));
}
// Virtual bases.
for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
// Ignore trivial destructors.
CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl());
if (BaseClassDecl->hasTrivialDestructor())
continue;
const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context);
MarkDeclarationReferenced(Destructor->getLocation(),
const_cast<CXXDestructorDecl*>(Dtor));
}
}
void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) {
if (!CDtorDecl)
return;
AdjustDeclIfTemplate(CDtorDecl);
if (CXXConstructorDecl *Constructor
= dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>()))
SetBaseOrMemberInitializers(Constructor, 0, 0, false);
}
namespace {
/// PureVirtualMethodCollector - traverses a class and its superclasses
/// and determines if it has any pure virtual methods.
class PureVirtualMethodCollector {
ASTContext &Context;
public:
typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList;
private:
MethodList Methods;
void Collect(const CXXRecordDecl* RD, MethodList& Methods);
public:
PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD)
: Context(Ctx) {
MethodList List;
Collect(RD, List);
// Copy the temporary list to methods, and make sure to ignore any
// null entries.
for (size_t i = 0, e = List.size(); i != e; ++i) {
if (List[i])
Methods.push_back(List[i]);
}
}
bool empty() const { return Methods.empty(); }
MethodList::const_iterator methods_begin() { return Methods.begin(); }
MethodList::const_iterator methods_end() { return Methods.end(); }
};
void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD,
MethodList& Methods) {
// First, collect the pure virtual methods for the base classes.
for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) {
if (const RecordType *RT = Base->getType()->getAs<RecordType>()) {
const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl());
if (BaseDecl && BaseDecl->isAbstract())
Collect(BaseDecl, Methods);
}
}
// Next, zero out any pure virtual methods that this class overrides.
typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy;
MethodSetTy OverriddenMethods;
size_t MethodsSize = Methods.size();
for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end();
i != e; ++i) {
// Traverse the record, looking for methods.
if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) {
// If the method is pure virtual, add it to the methods vector.
if (MD->isPure())
Methods.push_back(MD);
// Record all the overridden methods in our set.
for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
E = MD->end_overridden_methods(); I != E; ++I) {
// Keep track of the overridden methods.
OverriddenMethods.insert(*I);
}
}
}
// Now go through the methods and zero out all the ones we know are
// overridden.
for (size_t i = 0, e = MethodsSize; i != e; ++i) {
if (OverriddenMethods.count(Methods[i]))
Methods[i] = 0;
}
}
}
bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
unsigned DiagID, AbstractDiagSelID SelID,
const CXXRecordDecl *CurrentRD) {
if (SelID == -1)
return RequireNonAbstractType(Loc, T,
PDiag(DiagID), CurrentRD);
else
return RequireNonAbstractType(Loc, T,
PDiag(DiagID) << SelID, CurrentRD);
}
bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
const PartialDiagnostic &PD,
const CXXRecordDecl *CurrentRD) {
if (!getLangOptions().CPlusPlus)
return false;
if (const ArrayType *AT = Context.getAsArrayType(T))
return RequireNonAbstractType(Loc, AT->getElementType(), PD,
CurrentRD);
if (const PointerType *PT = T->getAs<PointerType>()) {
// Find the innermost pointer type.
while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>())
PT = T;
if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType()))
return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD);
}
const RecordType *RT = T->getAs<RecordType>();
if (!RT)
return false;
const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
if (!RD)
return false;
if (CurrentRD && CurrentRD != RD)
return false;
if (!RD->isAbstract())
return false;
Diag(Loc, PD) << RD->getDeclName();
// Check if we've already emitted the list of pure virtual functions for this
// class.
if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
return true;
PureVirtualMethodCollector Collector(Context, RD);
for (PureVirtualMethodCollector::MethodList::const_iterator I =
Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) {
const CXXMethodDecl *MD = *I;
Diag(MD->getLocation(), diag::note_pure_virtual_function) <<
MD->getDeclName();
}
if (!PureVirtualClassDiagSet)
PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
PureVirtualClassDiagSet->insert(RD);
return true;
}
namespace {
class AbstractClassUsageDiagnoser
: public DeclVisitor<AbstractClassUsageDiagnoser, bool> {
Sema &SemaRef;
CXXRecordDecl *AbstractClass;
bool VisitDeclContext(const DeclContext *DC) {
bool Invalid = false;
for (CXXRecordDecl::decl_iterator I = DC->decls_begin(),
E = DC->decls_end(); I != E; ++I)
Invalid |= Visit(*I);
return Invalid;
}
public:
AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac)
: SemaRef(SemaRef), AbstractClass(ac) {
Visit(SemaRef.Context.getTranslationUnitDecl());
}
bool VisitFunctionDecl(const FunctionDecl *FD) {
if (FD->isThisDeclarationADefinition()) {
// No need to do the check if we're in a definition, because it requires
// that the return/param types are complete.
// because that requires
return VisitDeclContext(FD);
}
// Check the return type.
QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType();
bool Invalid =
SemaRef.RequireNonAbstractType(FD->getLocation(), RTy,
diag::err_abstract_type_in_decl,
Sema::AbstractReturnType,
AbstractClass);
for (FunctionDecl::param_const_iterator I = FD->param_begin(),
E = FD->param_end(); I != E; ++I) {
const ParmVarDecl *VD = *I;
Invalid |=
SemaRef.RequireNonAbstractType(VD->getLocation(),
VD->getOriginalType(),
diag::err_abstract_type_in_decl,
Sema::AbstractParamType,
AbstractClass);
}
return Invalid;
}
bool VisitDecl(const Decl* D) {
if (const DeclContext *DC = dyn_cast<DeclContext>(D))
return VisitDeclContext(DC);
return false;
}
};
}
/// \brief Perform semantic checks on a class definition that has been
/// completing, introducing implicitly-declared members, checking for
/// abstract types, etc.
void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
if (!Record || Record->isInvalidDecl())
return;
if (!Record->isDependentType())
AddImplicitlyDeclaredMembersToClass(Record);
if (Record->isInvalidDecl())
return;
if (!Record->isAbstract()) {
// Collect all the pure virtual methods and see if this is an abstract
// class after all.
PureVirtualMethodCollector Collector(Context, Record);
if (!Collector.empty())
Record->setAbstract(true);
}
if (Record->isAbstract())
(void)AbstractClassUsageDiagnoser(*this, Record);
}
void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
DeclPtrTy TagDecl,
SourceLocation LBrac,
SourceLocation RBrac) {
if (!TagDecl)
return;
AdjustDeclIfTemplate(TagDecl);
ActOnFields(S, RLoc, TagDecl,
(DeclPtrTy*)FieldCollector->getCurFields(),
FieldCollector->getCurNumFields(), LBrac, RBrac, 0);
CheckCompletedCXXClass(
dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>()));
}
/// 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) {
CanQualType ClassType
= Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
// FIXME: Implicit declarations have exception specifications, which are
// the union of the specifications of the implicitly called functions.
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),
/*TInfo=*/0,
/*isExplicit=*/false,
/*isInline=*/true,
/*isImplicitlyDeclared=*/true);
DefaultCon->setAccess(AS_public);
DefaultCon->setImplicit();
DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor());
ClassDecl->addDecl(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()->getAs<RecordType>()->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->getAs<RecordType>()) {
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.getLValueReferenceType(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),
/*TInfo=*/0,
/*isExplicit=*/false,
/*isInline=*/true,
/*isImplicitlyDeclared=*/true);
CopyConstructor->setAccess(AS_public);
CopyConstructor->setImplicit();
CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor());
// Add the parameter to the constructor.
ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
ClassDecl->getLocation(),
/*IdentifierInfo=*/0,
ArgType, /*TInfo=*/0,
VarDecl::None, 0);
CopyConstructor->setParams(Context, &FromParam, 1);
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) {
assert(!Base->getType()->isDependentType() &&
"Cannot generate implicit members for class with dependent bases.");
const CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
const CXXMethodDecl *MD = 0;
HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context,
MD);
}
// -- 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->getAs<RecordType>()) {
const CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
const CXXMethodDecl *MD = 0;
HasConstCopyAssignment
= FieldClassDecl->hasConstCopyAssignment(Context, MD);
}
}
// Otherwise, the implicitly declared copy assignment operator will
// have the form
//
// X& X::operator=(X&)
QualType ArgType = ClassType;
QualType RetType = Context.getLValueReferenceType(ArgType);
if (HasConstCopyAssignment)
ArgType = ArgType.withConst();
ArgType = Context.getLValueReferenceType(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),
/*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true);
CopyAssignment->setAccess(AS_public);
CopyAssignment->setImplicit();
CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment());
CopyAssignment->setCopyAssignment(true);
// Add the parameter to the operator.
ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
ClassDecl->getLocation(),
/*IdentifierInfo=*/0,
ArgType, /*TInfo=*/0,
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);
AddOverriddenMethods(ClassDecl, 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();
Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
ClassDecl->addDecl(Destructor);
AddOverriddenMethods(ClassDecl, Destructor);
}
}
void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) {
Decl *D = TemplateD.getAs<Decl>();
if (!D)
return;
TemplateParameterList *Params = 0;
if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D))
Params = Template->getTemplateParameters();
else if (ClassTemplatePartialSpecializationDecl *PartialSpec
= dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
Params = PartialSpec->getTemplateParameters();
else
return;
for (TemplateParameterList::iterator Param = Params->begin(),
ParamEnd = Params->end();
Param != ParamEnd; ++Param) {
NamedDecl *Named = cast<NamedDecl>(*Param);
if (Named->getDeclName()) {
S->AddDecl(DeclPtrTy::make(Named));
IdResolver.AddDecl(Named);
}
}
}
/// 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, DeclPtrTy MethodD) {
if (!MethodD)
return;
AdjustDeclIfTemplate(MethodD);
CXXScopeSpec SS;
FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>());
QualType ClassTy
= Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext()));
SS.setScopeRep(
NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr()));
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, DeclPtrTy ParamD) {
if (!ParamD)
return;
ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>());
// 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(DeclPtrTy::make(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, DeclPtrTy MethodD) {
if (!MethodD)
return;
AdjustDeclIfTemplate(MethodD);
FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>());
CXXScopeSpec SS;
QualType ClassTy
= Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext()));
SS.setScopeRep(
NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr()));
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))
CheckConstructor(Constructor);
// 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 set the invalid bit to true. In any case, the type
/// will be updated to reflect a well-formed type for the constructor and
/// returned.
QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
FunctionDecl::StorageClass &SC) {
bool isVirtual = D.getDeclSpec().isVirtualSpecified();
// 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) {
if (!D.isInvalidType())
Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
<< "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
<< SourceRange(D.getIdentifierLoc());
D.setInvalidType();
}
if (SC == FunctionDecl::Static) {
if (!D.isInvalidType())
Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
<< "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
<< SourceRange(D.getIdentifierLoc());
D.setInvalidType();
SC = FunctionDecl::None;
}
DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
if (FTI.TypeQuals != 0) {
if (FTI.TypeQuals & Qualifiers::Const)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "const" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & Qualifiers::Volatile)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "volatile" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & Qualifiers::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->getAs<FunctionProtoType>();
return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(),
Proto->getNumArgs(),
Proto->isVariadic(), 0);
}
/// CheckConstructor - Checks a fully-formed constructor for
/// well-formedness, issuing any diagnostics required. Returns true if
/// the constructor declarator is invalid.
void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
CXXRecordDecl *ClassDecl
= dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
if (!ClassDecl)
return Constructor->setInvalidDecl();
// 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->isInvalidDecl() &&
((Constructor->getNumParams() == 1) ||
(Constructor->getNumParams() > 1 &&
Constructor->getParamDecl(1)->hasDefaultArg())) &&
Constructor->getTemplateSpecializationKind()
!= TSK_ImplicitInstantiation) {
QualType ParamType = Constructor->getParamDecl(0)->getType();
QualType ClassTy = Context.getTagDeclType(ClassDecl);
if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
Diag(ParamLoc, diag::err_constructor_byvalue_arg)
<< CodeModificationHint::CreateInsertion(ParamLoc, " const &");
// FIXME: Rather that making the constructor invalid, we should endeavor
// to fix the type.
Constructor->setInvalidDecl();
}
}
// Notify the class that we've added a constructor.
ClassDecl->addedConstructor(Context, Constructor);
}
/// CheckDestructor - Checks a fully-formed destructor for well-formedness,
/// issuing any diagnostics required. Returns true on error.
bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
CXXRecordDecl *RD = Destructor->getParent();
if (Destructor->isVirtual()) {
SourceLocation Loc;
if (!Destructor->isImplicit())
Loc = Destructor->getLocation();
else
Loc = RD->getLocation();
// If we have a virtual destructor, look up the deallocation function
FunctionDecl *OperatorDelete = 0;
DeclarationName Name =
Context.DeclarationNames.getCXXOperatorName(OO_Delete);
if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete))
return true;
Destructor->setOperatorDelete(OperatorDelete);
}
return false;
}
static inline bool
FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) {
return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
FTI.ArgInfo[0].Param &&
FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType());
}
/// 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 set the declarator to invalid. Even if this happens,
/// will be updated to reflect a well-formed type for the destructor and
/// returned.
QualType Sema::CheckDestructorDeclarator(Declarator &D,
FunctionDecl::StorageClass& SC) {
// 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 = GetTypeFromParser(D.getName().DestructorName);
if (isa<TypedefType>(DeclaratorType)) {
Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
<< DeclaratorType;
D.setInvalidType();
}
// 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) {
if (!D.isInvalidType())
Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
<< "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
<< SourceRange(D.getIdentifierLoc());
SC = FunctionDecl::None;
D.setInvalidType();
}
if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
// 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());
}
DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
if (FTI.TypeQuals & Qualifiers::Const)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "const" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & Qualifiers::Volatile)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "volatile" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & Qualifiers::Restrict)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "restrict" << SourceRange(D.getIdentifierLoc());
D.setInvalidType();
}
// Make sure we don't have any parameters.
if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) {
Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
// Delete the parameters.
FTI.freeArgs();
D.setInvalidType();
}
// Make sure the destructor isn't variadic.
if (FTI.isVariadic) {
Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
D.setInvalidType();
}
// 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.
return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0);
}
/// 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.
void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
FunctionDecl::StorageClass& SC) {
// 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) {
if (!D.isInvalidType())
Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
<< "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
<< SourceRange(D.getIdentifierLoc());
D.setInvalidType();
SC = FunctionDecl::None;
}
if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
// 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->getAs<FunctionProtoType>()->getNumArgs() > 0) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
// Delete the parameters.
D.getTypeObject(0).Fun.freeArgs();
D.setInvalidType();
}
// Make sure the conversion function isn't variadic.
if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
D.setInvalidType();
}
// C++ [class.conv.fct]p4:
// The conversion-type-id shall not represent a function type nor
// an array type.
QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId);
if (ConvType->isArrayType()) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
ConvType = Context.getPointerType(ConvType);
D.setInvalidType();
} else if (ConvType->isFunctionType()) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
ConvType = Context.getPointerType(ConvType);
D.setInvalidType();
}
// 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->getAs<FunctionProtoType>()->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());
}
/// 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::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
assert(Conversion && "Expected to receive a conversion function declaration");
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->getAs<ReferenceType>())
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()) {
const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration();
if (FunctionTemplateDecl *ConversionTemplate
= Conversion->getDescribedFunctionTemplate())
ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration();
if (ClassDecl->replaceConversion(ExpectedPrevDecl, Conversion))
return DeclPtrTy::make(Conversion);
assert(Conversion->isInvalidDecl() && "Conversion should not get here.");
} else if (FunctionTemplateDecl *ConversionTemplate
= Conversion->getDescribedFunctionTemplate())
ClassDecl->addConversionFunction(ConversionTemplate);
else if (!Conversion->getPrimaryTemplate()) // ignore specializations
ClassDecl->addConversionFunction(Conversion);
return DeclPtrTy::make(Conversion);
}
//===----------------------------------------------------------------------===//
// Namespace Handling
//===----------------------------------------------------------------------===//
/// ActOnStartNamespaceDef - This is called at the start of a namespace
/// definition.
Sema::DeclPtrTy 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
= LookupSingleName(DeclRegionScope, II, LookupOrdinaryName,
ForRedeclaration);
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(DeclPtrTy::make(OrigNS))) {
IdResolver.RemoveDecl(OrigNS);
DeclRegionScope->RemoveDecl(DeclPtrTy::make(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.
} else if (II->isStr("std") &&
CurContext->getLookupContext()->isTranslationUnit()) {
// This is the first "real" definition of the namespace "std", so update
// our cache of the "std" namespace to point at this definition.
if (StdNamespace) {
// We had already defined a dummy namespace "std". Link this new
// namespace definition to the dummy namespace "std".
StdNamespace->setNextNamespace(Namespc);
StdNamespace->setLocation(IdentLoc);
Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace());
}
// Make our StdNamespace cache point at the first real definition of the
// "std" namespace.
StdNamespace = Namespc;
}
PushOnScopeChains(Namespc, DeclRegionScope);
} else {
// Anonymous namespaces.
assert(Namespc->isAnonymousNamespace());
CurContext->addDecl(Namespc);
// Link the anonymous namespace into its parent.
NamespaceDecl *PrevDecl;
DeclContext *Parent = CurContext->getLookupContext();
if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
PrevDecl = TU->getAnonymousNamespace();
TU->setAnonymousNamespace(Namespc);
} else {
NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
PrevDecl = ND->getAnonymousNamespace();
ND->setAnonymousNamespace(Namespc);
}
// Link the anonymous namespace with its previous declaration.
if (PrevDecl) {
assert(PrevDecl->isAnonymousNamespace());
assert(!PrevDecl->getNextNamespace());
Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace());
PrevDecl->setNextNamespace(Namespc);
}
// C++ [namespace.unnamed]p1. An unnamed-namespace-definition
// behaves as if it were replaced by
// namespace unique { /* empty body */ }
// using namespace unique;
// namespace unique { namespace-body }
// where all occurrences of 'unique' in a translation unit are
// replaced by the same identifier and this identifier differs
// from all other identifiers in the entire program.
// We just create the namespace with an empty name and then add an
// implicit using declaration, just like the standard suggests.
//
// CodeGen enforces the "universally unique" aspect by giving all
// declarations semantically contained within an anonymous
// namespace internal linkage.
if (!PrevDecl) {
UsingDirectiveDecl* UD
= UsingDirectiveDecl::Create(Context, CurContext,
/* 'using' */ LBrace,
/* 'namespace' */ SourceLocation(),
/* qualifier */ SourceRange(),
/* NNS */ NULL,
/* identifier */ SourceLocation(),
Namespc,
/* Ancestor */ CurContext);
UD->setImplicit();
CurContext->addDecl(UD);
}
}
// 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 DeclPtrTy::make(Namespc);
}
/// getNamespaceDecl - Returns the namespace a decl represents. If the decl
/// is a namespace alias, returns the namespace it points to.
static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
return AD->getNamespace();
return dyn_cast_or_null<NamespaceDecl>(D);
}
/// ActOnFinishNamespaceDef - This callback is called after a namespace is
/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) {
Decl *Dcl = D.getAs<Decl>();
NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
assert(Namespc && "Invalid parameter, expected NamespaceDecl");
Namespc->setRBracLoc(RBrace);
PopDeclContext();
}
Sema::DeclPtrTy 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(*this, NamespcName, IdentLoc, LookupNamespaceName);
LookupParsedName(R, S, &SS);
if (R.isAmbiguous())
return DeclPtrTy();
if (!R.empty()) {
NamedDecl *Named = R.getFoundDecl();
assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named))
&& "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.
NamespaceDecl *NS = getNamespaceDecl(Named);
DeclContext *CommonAncestor = cast<DeclContext>(NS);
while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
CommonAncestor = CommonAncestor->getParent();
UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
SS.getRange(),
(NestedNameSpecifier *)SS.getScopeRep(),
IdentLoc, Named, CommonAncestor);
PushUsingDirective(S, UDir);
} else {
Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
}
// FIXME: We ignore attributes for now.
delete AttrList;
return DeclPtrTy::make(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(DeclPtrTy::make(UDir));
}
Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S,
AccessSpecifier AS,
bool HasUsingKeyword,
SourceLocation UsingLoc,
const CXXScopeSpec &SS,
UnqualifiedId &Name,
AttributeList *AttrList,
bool IsTypeName,
SourceLocation TypenameLoc) {
assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
switch (Name.getKind()) {
case UnqualifiedId::IK_Identifier:
case UnqualifiedId::IK_OperatorFunctionId:
case UnqualifiedId::IK_LiteralOperatorId:
case UnqualifiedId::IK_ConversionFunctionId:
break;
case UnqualifiedId::IK_ConstructorName:
// C++0x inherited constructors.
if (getLangOptions().CPlusPlus0x) break;
Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor)
<< SS.getRange();
return DeclPtrTy();
case UnqualifiedId::IK_DestructorName:
Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor)
<< SS.getRange();
return DeclPtrTy();
case UnqualifiedId::IK_TemplateId:
Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id)
<< SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
return DeclPtrTy();
}
DeclarationName TargetName = GetNameFromUnqualifiedId(Name);
if (!TargetName)
return DeclPtrTy();
// Warn about using declarations.
// TODO: store that the declaration was written without 'using' and
// talk about access decls instead of using decls in the
// diagnostics.
if (!HasUsingKeyword) {
UsingLoc = Name.getSourceRange().getBegin();
Diag(UsingLoc, diag::warn_access_decl_deprecated)
<< CodeModificationHint::CreateInsertion(SS.getRange().getBegin(),
"using ");
}
NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS,
Name.getSourceRange().getBegin(),
TargetName, AttrList,
/* IsInstantiation */ false,
IsTypeName, TypenameLoc);
if (UD)
PushOnScopeChains(UD, S, /*AddToContext*/ false);
return DeclPtrTy::make(UD);
}
/// Determines whether to create a using shadow decl for a particular
/// decl, given the set of decls existing prior to this using lookup.
bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
const LookupResult &Previous) {
// Diagnose finding a decl which is not from a base class of the
// current class. We do this now because there are cases where this
// function will silently decide not to build a shadow decl, which
// will pre-empt further diagnostics.
//
// We don't need to do this in C++0x because we do the check once on
// the qualifier.
//
// FIXME: diagnose the following if we care enough:
// struct A { int foo; };
// struct B : A { using A::foo; };
// template <class T> struct C : A {};
// template <class T> struct D : C<T> { using B::foo; } // <---
// This is invalid (during instantiation) in C++03 because B::foo
// resolves to the using decl in B, which is not a base class of D<T>.
// We can't diagnose it immediately because C<T> is an unknown
// specialization. The UsingShadowDecl in D<T> then points directly
// to A::foo, which will look well-formed when we instantiate.
// The right solution is to not collapse the shadow-decl chain.
if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) {
DeclContext *OrigDC = Orig->getDeclContext();
// Handle enums and anonymous structs.
if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
while (OrigRec->isAnonymousStructOrUnion())
OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
if (OrigDC == CurContext) {
Diag(Using->getLocation(),
diag::err_using_decl_nested_name_specifier_is_current_class)
<< Using->getNestedNameRange();
Diag(Orig->getLocation(), diag::note_using_decl_target);
return true;
}
Diag(Using->getNestedNameRange().getBegin(),
diag::err_using_decl_nested_name_specifier_is_not_base_class)
<< Using->getTargetNestedNameDecl()
<< cast<CXXRecordDecl>(CurContext)
<< Using->getNestedNameRange();
Diag(Orig->getLocation(), diag::note_using_decl_target);
return true;
}
}
if (Previous.empty()) return false;
NamedDecl *Target = Orig;
if (isa<UsingShadowDecl>(Target))
Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
// If the target happens to be one of the previous declarations, we
// don't have a conflict.
//
// FIXME: but we might be increasing its access, in which case we
// should redeclare it.
NamedDecl *NonTag = 0, *Tag = 0;
for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
I != E; ++I) {
NamedDecl *D = (*I)->getUnderlyingDecl();
if (D->getCanonicalDecl() == Target->getCanonicalDecl())
return false;
(isa<TagDecl>(D) ? Tag : NonTag) = D;
}
if (Target->isFunctionOrFunctionTemplate()) {
FunctionDecl *FD;
if (isa<FunctionTemplateDecl>(Target))
FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl();
else
FD = cast<FunctionDecl>(Target);
NamedDecl *OldDecl = 0;
switch (CheckOverload(FD, Previous, OldDecl)) {
case Ovl_Overload:
return false;
case Ovl_NonFunction:
Diag(Using->getLocation(), diag::err_using_decl_conflict);
break;
// We found a decl with the exact signature.
case Ovl_Match:
if (isa<UsingShadowDecl>(OldDecl)) {
// Silently ignore the possible conflict.
return false;
}
// If we're in a record, we want to hide the target, so we
// return true (without a diagnostic) to tell the caller not to
// build a shadow decl.
if (CurContext->isRecord())
return true;
// If we're not in a record, this is an error.
Diag(Using->getLocation(), diag::err_using_decl_conflict);
break;
}
Diag(Target->getLocation(), diag::note_using_decl_target);
Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
return true;
}
// Target is not a function.
if (isa<TagDecl>(Target)) {
// No conflict between a tag and a non-tag.
if (!Tag) return false;
Diag(Using->getLocation(), diag::err_using_decl_conflict);
Diag(Target->getLocation(), diag::note_using_decl_target);
Diag(Tag->getLocation(), diag::note_using_decl_conflict);
return true;
}
// No conflict between a tag and a non-tag.
if (!NonTag) return false;
Diag(Using->getLocation(), diag::err_using_decl_conflict);
Diag(Target->getLocation(), diag::note_using_decl_target);
Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
return true;
}
/// Builds a shadow declaration corresponding to a 'using' declaration.
UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
UsingDecl *UD,
NamedDecl *Orig) {
// If we resolved to another shadow declaration, just coalesce them.
NamedDecl *Target = Orig;
if (isa<UsingShadowDecl>(Target)) {
Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration");
}
UsingShadowDecl *Shadow
= UsingShadowDecl::Create(Context, CurContext,
UD->getLocation(), UD, Target);
UD->addShadowDecl(Shadow);
if (S)
PushOnScopeChains(Shadow, S);
else
CurContext->addDecl(Shadow);
Shadow->setAccess(UD->getAccess());
if (Orig->isInvalidDecl() || UD->isInvalidDecl())
Shadow->setInvalidDecl();
return Shadow;
}
/// Hides a using shadow declaration. This is required by the current
/// using-decl implementation when a resolvable using declaration in a
/// class is followed by a declaration which would hide or override
/// one or more of the using decl's targets; for example:
///
/// struct Base { void foo(int); };
/// struct Derived : Base {
/// using Base::foo;
/// void foo(int);
/// };
///
/// The governing language is C++03 [namespace.udecl]p12:
///
/// When a using-declaration brings names from a base class into a
/// derived class scope, member functions in the derived class
/// override and/or hide member functions with the same name and
/// parameter types in a base class (rather than conflicting).
///
/// There are two ways to implement this:
/// (1) optimistically create shadow decls when they're not hidden
/// by existing declarations, or
/// (2) don't create any shadow decls (or at least don't make them
/// visible) until we've fully parsed/instantiated the class.
/// The problem with (1) is that we might have to retroactively remove
/// a shadow decl, which requires several O(n) operations because the
/// decl structures are (very reasonably) not designed for removal.
/// (2) avoids this but is very fiddly and phase-dependent.
void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
// Remove it from the DeclContext...
Shadow->getDeclContext()->removeDecl(Shadow);
// ...and the scope, if applicable...
if (S) {
S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow)));
IdResolver.RemoveDecl(Shadow);
}
// ...and the using decl.
Shadow->getUsingDecl()->removeShadowDecl(Shadow);
// TODO: complain somehow if Shadow was used. It shouldn't
// be possible for this to happen, because
}
/// Builds a using declaration.
///
/// \param IsInstantiation - Whether this call arises from an
/// instantiation of an unresolved using declaration. We treat
/// the lookup differently for these declarations.
NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
SourceLocation UsingLoc,
const CXXScopeSpec &SS,
SourceLocation IdentLoc,
DeclarationName Name,
AttributeList *AttrList,
bool IsInstantiation,
bool IsTypeName,
SourceLocation TypenameLoc) {
assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
assert(IdentLoc.isValid() && "Invalid TargetName location.");
// FIXME: We ignore attributes for now.
delete AttrList;
if (SS.isEmpty()) {
Diag(IdentLoc, diag::err_using_requires_qualname);
return 0;
}
// Do the redeclaration lookup in the current scope.
LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName,
ForRedeclaration);
Previous.setHideTags(false);
if (S) {
LookupName(Previous, S);
// It is really dumb that we have to do this.
LookupResult::Filter F = Previous.makeFilter();
while (F.hasNext()) {
NamedDecl *D = F.next();
if (!isDeclInScope(D, CurContext, S))
F.erase();
}
F.done();
} else {
assert(IsInstantiation && "no scope in non-instantiation");
assert(CurContext->isRecord() && "scope not record in instantiation");
LookupQualifiedName(Previous, CurContext);
}
NestedNameSpecifier *NNS =
static_cast<NestedNameSpecifier *>(SS.getScopeRep());
// Check for invalid redeclarations.
if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous))
return 0;
// Check for bad qualifiers.
if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc))
return 0;
DeclContext *LookupContext = computeDeclContext(SS);
NamedDecl *D;
if (!LookupContext) {
if (IsTypeName) {
// FIXME: not all declaration name kinds are legal here
D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
UsingLoc, TypenameLoc,
SS.getRange(), NNS,
IdentLoc, Name);
} else {
D = UnresolvedUsingValueDecl::Create(Context, CurContext,
UsingLoc, SS.getRange(), NNS,
IdentLoc, Name);
}
} else {
D = UsingDecl::Create(Context, CurContext, IdentLoc,
SS.getRange(), UsingLoc, NNS, Name,
IsTypeName);
}
D->setAccess(AS);
CurContext->addDecl(D);
if (!LookupContext) return D;
UsingDecl *UD = cast<UsingDecl>(D);
if (RequireCompleteDeclContext(SS)) {
UD->setInvalidDecl();
return UD;
}
// Look up the target name.
LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName);
// Unlike most lookups, we don't always want to hide tag
// declarations: tag names are visible through the using declaration
// even if hidden by ordinary names, *except* in a dependent context
// where it's important for the sanity of two-phase lookup.
if (!IsInstantiation)
R.setHideTags(false);
LookupQualifiedName(R, LookupContext);
if (R.empty()) {
Diag(IdentLoc, diag::err_no_member)
<< Name << LookupContext << SS.getRange();
UD->setInvalidDecl();
return UD;
}
if (R.isAmbiguous()) {
UD->setInvalidDecl();
return UD;
}
if (IsTypeName) {
// If we asked for a typename and got a non-type decl, error out.
if (!R.getAsSingle<TypeDecl>()) {
Diag(IdentLoc, diag::err_using_typename_non_type);
for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
Diag((*I)->getUnderlyingDecl()->getLocation(),
diag::note_using_decl_target);
UD->setInvalidDecl();
return UD;
}
} else {
// If we asked for a non-typename and we got a type, error out,
// but only if this is an instantiation of an unresolved using
// decl. Otherwise just silently find the type name.
if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
Diag(IdentLoc, diag::err_using_dependent_value_is_type);
Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
UD->setInvalidDecl();
return UD;
}
}
// C++0x N2914 [namespace.udecl]p6:
// A using-declaration shall not name a namespace.
if (R.getAsSingle<NamespaceDecl>()) {
Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
<< SS.getRange();
UD->setInvalidDecl();
return UD;
}
for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
if (!CheckUsingShadowDecl(UD, *I, Previous))
BuildUsingShadowDecl(S, UD, *I);
}
return UD;
}
/// Checks that the given using declaration is not an invalid
/// redeclaration. Note that this is checking only for the using decl
/// itself, not for any ill-formedness among the UsingShadowDecls.
bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
bool isTypeName,
const CXXScopeSpec &SS,
SourceLocation NameLoc,
const LookupResult &Prev) {
// C++03 [namespace.udecl]p8:
// C++0x [namespace.udecl]p10:
// A using-declaration is a declaration and can therefore be used
// repeatedly where (and only where) multiple declarations are
// allowed.
// That's only in file contexts.
if (CurContext->getLookupContext()->isFileContext())
return false;
NestedNameSpecifier *Qual
= static_cast<NestedNameSpecifier*>(SS.getScopeRep());
for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
NamedDecl *D = *I;
bool DTypename;
NestedNameSpecifier *DQual;
if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
DTypename = UD->isTypeName();
DQual = UD->getTargetNestedNameDecl();
} else if (UnresolvedUsingValueDecl *UD
= dyn_cast<UnresolvedUsingValueDecl>(D)) {
DTypename = false;
DQual = UD->getTargetNestedNameSpecifier();
} else if (UnresolvedUsingTypenameDecl *UD
= dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
DTypename = true;
DQual = UD->getTargetNestedNameSpecifier();
} else continue;
// using decls differ if one says 'typename' and the other doesn't.
// FIXME: non-dependent using decls?
if (isTypeName != DTypename) continue;
// using decls differ if they name different scopes (but note that
// template instantiation can cause this check to trigger when it
// didn't before instantiation).
if (Context.getCanonicalNestedNameSpecifier(Qual) !=
Context.getCanonicalNestedNameSpecifier(DQual))
continue;
Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
Diag(D->getLocation(), diag::note_using_decl) << 1;
return true;
}
return false;
}
/// Checks that the given nested-name qualifier used in a using decl
/// in the current context is appropriately related to the current
/// scope. If an error is found, diagnoses it and returns true.
bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
const CXXScopeSpec &SS,
SourceLocation NameLoc) {
DeclContext *NamedContext = computeDeclContext(SS);
if (!CurContext->isRecord()) {
// C++03 [namespace.udecl]p3:
// C++0x [namespace.udecl]p8:
// A using-declaration for a class member shall be a member-declaration.
// If we weren't able to compute a valid scope, it must be a
// dependent class scope.
if (!NamedContext || NamedContext->isRecord()) {
Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
<< SS.getRange();
return true;
}
// Otherwise, everything is known to be fine.
return false;
}
// The current scope is a record.
// If the named context is dependent, we can't decide much.
if (!NamedContext) {
// FIXME: in C++0x, we can diagnose if we can prove that the
// nested-name-specifier does not refer to a base class, which is
// still possible in some cases.
// Otherwise we have to conservatively report that things might be
// okay.
return false;
}
if (!NamedContext->isRecord()) {
// Ideally this would point at the last name in the specifier,
// but we don't have that level of source info.
Diag(SS.getRange().getBegin(),
diag::err_using_decl_nested_name_specifier_is_not_class)
<< (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange();
return true;
}
if (getLangOptions().CPlusPlus0x) {
// C++0x [namespace.udecl]p3:
// In a using-declaration used as a member-declaration, the
// nested-name-specifier shall name a base class of the class
// being defined.
if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
cast<CXXRecordDecl>(NamedContext))) {
if (CurContext == NamedContext) {
Diag(NameLoc,
diag::err_using_decl_nested_name_specifier_is_current_class)
<< SS.getRange();
return true;
}
Diag(SS.getRange().getBegin(),
diag::err_using_decl_nested_name_specifier_is_not_base_class)
<< (NestedNameSpecifier*) SS.getScopeRep()
<< cast<CXXRecordDecl>(CurContext)
<< SS.getRange();
return true;
}
return false;
}
// C++03 [namespace.udecl]p4:
// A using-declaration used as a member-declaration shall refer
// to a member of a base class of the class being defined [etc.].
// Salient point: SS doesn't have to name a base class as long as
// lookup only finds members from base classes. Therefore we can
// diagnose here only if we can prove that that can't happen,
// i.e. if the class hierarchies provably don't intersect.
// TODO: it would be nice if "definitely valid" results were cached
// in the UsingDecl and UsingShadowDecl so that these checks didn't
// need to be repeated.
struct UserData {
llvm::DenseSet<const CXXRecordDecl*> Bases;
static bool collect(const CXXRecordDecl *Base, void *OpaqueData) {
UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
Data->Bases.insert(Base);
return true;
}
bool hasDependentBases(const CXXRecordDecl *Class) {
return !Class->forallBases(collect, this);
}
/// Returns true if the base is dependent or is one of the
/// accumulated base classes.
static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) {
UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
return !Data->Bases.count(Base);
}
bool mightShareBases(const CXXRecordDecl *Class) {
return Bases.count(Class) || !Class->forallBases(doesNotContain, this);
}
};
UserData Data;
// Returns false if we find a dependent base.
if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext)))
return false;
// Returns false if the class has a dependent base or if it or one
// of its bases is present in the base set of the current context.
if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext)))
return false;
Diag(SS.getRange().getBegin(),
diag::err_using_decl_nested_name_specifier_is_not_base_class)
<< (NestedNameSpecifier*) SS.getScopeRep()
<< cast<CXXRecordDecl>(CurContext)
<< SS.getRange();
return true;
}
Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S,
SourceLocation NamespaceLoc,
SourceLocation AliasLoc,
IdentifierInfo *Alias,
const CXXScopeSpec &SS,
SourceLocation IdentLoc,
IdentifierInfo *Ident) {
// Lookup the namespace name.
LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
LookupParsedName(R, S, &SS);
// Check if we have a previous declaration with the same name.
if (NamedDecl *PrevDecl
= LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) {
if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
// We already have an alias with the same name that points to the same
// namespace, so don't create a new one.
if (!R.isAmbiguous() && !R.empty() &&
AD->getNamespace() == getNamespaceDecl(R.getFoundDecl()))
return DeclPtrTy();
}
unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition :
diag::err_redefinition_different_kind;
Diag(AliasLoc, DiagID) << Alias;
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
return DeclPtrTy();
}
if (R.isAmbiguous())
return DeclPtrTy();
if (R.empty()) {
Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange();
return DeclPtrTy();
}
NamespaceAliasDecl *AliasDecl =
NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
Alias, SS.getRange(),
(NestedNameSpecifier *)SS.getScopeRep(),
IdentLoc, R.getFoundDecl());
CurContext->addDecl(AliasDecl);
return DeclPtrTy::make(AliasDecl);
}
void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
CXXConstructorDecl *Constructor) {
assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() &&
!Constructor->isUsed()) &&
"DefineImplicitDefaultConstructor - call it for implicit default ctor");
CXXRecordDecl *ClassDecl
= cast<CXXRecordDecl>(Constructor->getDeclContext());
assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) {
Diag(CurrentLocation, diag::note_member_synthesized_at)
<< CXXDefaultConstructor << Context.getTagDeclType(ClassDecl);
Constructor->setInvalidDecl();
} else {
Constructor->setUsed();
}
}
void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
CXXDestructorDecl *Destructor) {
assert((Destructor->isImplicit() && !Destructor->isUsed()) &&
"DefineImplicitDestructor - call it for implicit default dtor");
CXXRecordDecl *ClassDecl = Destructor->getParent();
assert(ClassDecl && "DefineImplicitDestructor - invalid destructor");
// C++ [class.dtor] p5
// Before the implicitly-declared default destructor for a class is
// implicitly defined, all the implicitly-declared default destructors
// for its base class and its non-static data members shall have been
// implicitly defined.
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
E = ClassDecl->bases_end(); Base != E; ++Base) {
CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
if (!BaseClassDecl->hasTrivialDestructor()) {
if (CXXDestructorDecl *BaseDtor =
const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context)))
MarkDeclarationReferenced(CurrentLocation, BaseDtor);
else
assert(false &&
"DefineImplicitDestructor - missing dtor in a base class");
}
}
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
E = ClassDecl->field_end(); Field != E; ++Field) {
QualType FieldType = Context.getCanonicalType((*Field)->getType());
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
if (!FieldClassDecl->hasTrivialDestructor()) {
if (CXXDestructorDecl *FieldDtor =
const_cast<CXXDestructorDecl*>(
FieldClassDecl->getDestructor(Context)))
MarkDeclarationReferenced(CurrentLocation, FieldDtor);
else
assert(false &&
"DefineImplicitDestructor - missing dtor in class of a data member");
}
}
}
// FIXME: If CheckDestructor fails, we should emit a note about where the
// implicit destructor was needed.
if (CheckDestructor(Destructor)) {
Diag(CurrentLocation, diag::note_member_synthesized_at)
<< CXXDestructor << Context.getTagDeclType(ClassDecl);
Destructor->setInvalidDecl();
return;
}
Destructor->setUsed();
}
void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation,
CXXMethodDecl *MethodDecl) {
assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() &&
MethodDecl->getOverloadedOperator() == OO_Equal &&
!MethodDecl->isUsed()) &&
"DefineImplicitOverloadedAssign - call it for implicit assignment op");
CXXRecordDecl *ClassDecl
= cast<CXXRecordDecl>(MethodDecl->getDeclContext());
// C++[class.copy] p12
// Before the implicitly-declared copy assignment operator for a class is
// implicitly defined, all implicitly-declared copy assignment operators
// for its direct base classes and its nonstatic data members shall have
// been implicitly defined.
bool err = false;
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
E = ClassDecl->bases_end(); Base != E; ++Base) {
CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
if (CXXMethodDecl *BaseAssignOpMethod =
getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0),
BaseClassDecl))
MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod);
}
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
E = ClassDecl->field_end(); Field != E; ++Field) {
QualType FieldType = Context.getCanonicalType((*Field)->getType());
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
if (CXXMethodDecl *FieldAssignOpMethod =
getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0),
FieldClassDecl))
MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod);
} else if (FieldType->isReferenceType()) {
Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
<< Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
Diag(Field->getLocation(), diag::note_declared_at);
Diag(CurrentLocation, diag::note_first_required_here);
err = true;
} else if (FieldType.isConstQualified()) {
Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
<< Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
Diag(Field->getLocation(), diag::note_declared_at);
Diag(CurrentLocation, diag::note_first_required_here);
err = true;
}
}
if (!err)
MethodDecl->setUsed();
}
CXXMethodDecl *
Sema::getAssignOperatorMethod(SourceLocation CurrentLocation,
ParmVarDecl *ParmDecl,
CXXRecordDecl *ClassDecl) {
QualType LHSType = Context.getTypeDeclType(ClassDecl);
QualType RHSType(LHSType);
// If class's assignment operator argument is const/volatile qualified,
// look for operator = (const/volatile B&). Otherwise, look for
// operator = (B&).
RHSType = Context.getCVRQualifiedType(RHSType,
ParmDecl->getType().getCVRQualifiers());
ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl,
LHSType,
SourceLocation()));
ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl,
RHSType,
CurrentLocation));
Expr *Args[2] = { &*LHS, &*RHS };
OverloadCandidateSet CandidateSet;
AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2,
CandidateSet);
OverloadCandidateSet::iterator Best;
if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success)
return cast<CXXMethodDecl>(Best->Function);
assert(false &&
"getAssignOperatorMethod - copy assignment operator method not found");
return 0;
}
void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
CXXConstructorDecl *CopyConstructor,
unsigned TypeQuals) {
assert((CopyConstructor->isImplicit() &&
CopyConstructor->isCopyConstructor(Context, TypeQuals) &&
!CopyConstructor->isUsed()) &&
"DefineImplicitCopyConstructor - call it for implicit copy ctor");
CXXRecordDecl *ClassDecl
= cast<CXXRecordDecl>(CopyConstructor->getDeclContext());
assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
// C++ [class.copy] p209
// Before the implicitly-declared copy constructor for a class is
// implicitly defined, all the implicitly-declared copy constructors
// for its base class and its non-static data members shall have been
// implicitly defined.
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
Base != ClassDecl->bases_end(); ++Base) {
CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
if (CXXConstructorDecl *BaseCopyCtor =
BaseClassDecl->getCopyConstructor(Context, TypeQuals))
MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor);
}
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
FieldEnd = ClassDecl->field_end();
Field != FieldEnd; ++Field) {
QualType FieldType = Context.getCanonicalType((*Field)->getType());
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
if (CXXConstructorDecl *FieldCopyCtor =
FieldClassDecl->getCopyConstructor(Context, TypeQuals))
MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor);
}
}
CopyConstructor->setUsed();
}
Sema::OwningExprResult
Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
CXXConstructorDecl *Constructor,
MultiExprArg ExprArgs,
bool RequiresZeroInit) {
bool Elidable = false;
// C++ [class.copy]p15:
// Whenever a temporary class object is copied using a copy constructor, and
// this object and the copy have the same cv-unqualified type, an
// implementation is permitted to treat the original and the copy as two
// different ways of referring to the same object and not perform a copy at
// all, even if the class copy constructor or destructor have side effects.
// FIXME: Is this enough?
if (Constructor->isCopyConstructor(Context)) {
Expr *E = ((Expr **)ExprArgs.get())[0];
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
if (ICE->getCastKind() == CastExpr::CK_NoOp)
E = ICE->getSubExpr();
while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E))
E = BE->getSubExpr();
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
if (ICE->getCastKind() == CastExpr::CK_NoOp)
E = ICE->getSubExpr();
if (CallExpr *CE = dyn_cast<CallExpr>(E))
Elidable = !CE->getCallReturnType()->isReferenceType();
else if (isa<CXXTemporaryObjectExpr>(E))
Elidable = true;
}
return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor,
Elidable, move(ExprArgs), RequiresZeroInit);
}
/// BuildCXXConstructExpr - Creates a complete call to a constructor,
/// including handling of its default argument expressions.
Sema::OwningExprResult
Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
CXXConstructorDecl *Constructor, bool Elidable,
MultiExprArg ExprArgs,
bool RequiresZeroInit) {
unsigned NumExprs = ExprArgs.size();
Expr **Exprs = (Expr **)ExprArgs.release();
MarkDeclarationReferenced(ConstructLoc, Constructor);
return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc,
Constructor, Elidable, Exprs, NumExprs,
RequiresZeroInit));
}
Sema::OwningExprResult
Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor,
QualType Ty,
SourceLocation TyBeginLoc,
MultiExprArg Args,
SourceLocation RParenLoc) {
unsigned NumExprs = Args.size();
Expr **Exprs = (Expr **)Args.release();
MarkDeclarationReferenced(TyBeginLoc, Constructor);
return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty,
TyBeginLoc, Exprs,
NumExprs, RParenLoc));
}
bool Sema::InitializeVarWithConstructor(VarDecl *VD,
CXXConstructorDecl *Constructor,
MultiExprArg Exprs) {
OwningExprResult TempResult =
BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor,
move(Exprs));
if (TempResult.isInvalid())
return true;
Expr *Temp = TempResult.takeAs<Expr>();
MarkDeclarationReferenced(VD->getLocation(), Constructor);
Temp = MaybeCreateCXXExprWithTemporaries(Temp);
VD->setInit(Context, Temp);
return false;
}
void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) {
CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(
DeclInitType->getAs<RecordType>()->getDecl());
if (!ClassDecl->hasTrivialDestructor())
if (CXXDestructorDecl *Destructor =
const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context)))
MarkDeclarationReferenced(VD->getLocation(), Destructor);
}
/// AddCXXDirectInitializerToDecl - This action is called immediately after
/// ActOnDeclarator, when a C++ direct initializer is present.
/// e.g: "int x(1);"
void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl,
SourceLocation LParenLoc,
MultiExprArg Exprs,
SourceLocation *CommaLocs,
SourceLocation RParenLoc) {
unsigned NumExprs = Exprs.size();
assert(NumExprs != 0 && Exprs.get() && "missing expressions");
Decl *RealDecl = Dcl.getAs<Decl>();
// 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 represent direct-initialization similarly to 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.
// If either the declaration has a dependent type or if any of the expressions
// is type-dependent, we represent the initialization via a ParenListExpr for
// later use during template instantiation.
if (VDecl->getType()->isDependentType() ||
Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) {
// Let clients know that initialization was done with a direct initializer.
VDecl->setCXXDirectInitializer(true);
// Store the initialization expressions as a ParenListExpr.
unsigned NumExprs = Exprs.size();
VDecl->setInit(Context,
new (Context) ParenListExpr(Context, LParenLoc,
(Expr **)Exprs.release(),
NumExprs, RParenLoc));
return;
}
// 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 = Context.getBaseElementType(Array);
// FIXME: This isn't the right place to complete the type.
if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(),
diag::err_typecheck_decl_incomplete_type)) {
VDecl->setInvalidDecl();
return;
}
if (VDecl->getType()->isRecordType()) {
ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
CXXConstructorDecl *Constructor
= PerformInitializationByConstructor(DeclInitType,
move(Exprs),
VDecl->getLocation(),
SourceRange(VDecl->getLocation(),
RParenLoc),
VDecl->getDeclName(),
InitializationKind::CreateDirect(VDecl->getLocation(),
LParenLoc,
RParenLoc),
ConstructorArgs);
if (!Constructor)
RealDecl->setInvalidDecl();
else {
VDecl->setCXXDirectInitializer(true);
if (InitializeVarWithConstructor(VDecl, Constructor,
move_arg(ConstructorArgs)))
RealDecl->setInvalidDecl();
FinalizeVarWithDestructor(VDecl, DeclInitType);
}
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);
}
/// \brief Add the applicable constructor candidates for an initialization
/// by constructor.
static void AddConstructorInitializationCandidates(Sema &SemaRef,
QualType ClassType,
Expr **Args,
unsigned NumArgs,
InitializationKind Kind,
OverloadCandidateSet &CandidateSet) {
// 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 RecordType *ClassRec = ClassType->getAs<RecordType>();
assert(ClassRec && "Can only initialize a class type here");
// FIXME: When we decide not to synthesize the implicitly-declared
// constructors, we'll need to make them appear here.
const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl());
DeclarationName ConstructorName
= SemaRef.Context.DeclarationNames.getCXXConstructorName(
SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType());
DeclContext::lookup_const_iterator Con, ConEnd;
for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName);
Con != ConEnd; ++Con) {
// Find the constructor (which may be a template).
CXXConstructorDecl *Constructor = 0;
FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con);
if (ConstructorTmpl)
Constructor
= cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl());
else
Constructor = cast<CXXConstructorDecl>(*Con);
if ((Kind.getKind() == InitializationKind::IK_Direct) ||
(Kind.getKind() == InitializationKind::IK_Value) ||
(Kind.getKind() == InitializationKind::IK_Copy &&
Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) ||
((Kind.getKind() == InitializationKind::IK_Default) &&
Constructor->isDefaultConstructor())) {
if (ConstructorTmpl)
SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl,
/*ExplicitArgs*/ 0,
Args, NumArgs, CandidateSet);
else
SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet);
}
}
}
/// \brief Attempt to perform initialization by constructor
/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or
/// copy-initialization.
///
/// This routine determines whether initialization by constructor is possible,
/// but it does not emit any diagnostics in the case where the initialization
/// is ill-formed.
///
/// \param ClassType the type of the object being initialized, which must have
/// class type.
///
/// \param Args the arguments provided to initialize the object
///
/// \param NumArgs the number of arguments provided to initialize the object
///
/// \param Kind the type of initialization being performed
///
/// \returns the constructor used to initialize the object, if successful.
/// Otherwise, emits a diagnostic and returns NULL.
CXXConstructorDecl *
Sema::TryInitializationByConstructor(QualType ClassType,
Expr **Args, unsigned NumArgs,
SourceLocation Loc,
InitializationKind Kind) {
// Build the overload candidate set
OverloadCandidateSet CandidateSet;
AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind,
CandidateSet);
// Determine whether we found a constructor we can use.
OverloadCandidateSet::iterator Best;
switch (BestViableFunction(CandidateSet, Loc, Best)) {
case OR_Success:
case OR_Deleted:
// We found a constructor. Return it.
return cast<CXXConstructorDecl>(Best->Function);
case OR_No_Viable_Function:
case OR_Ambiguous:
// Overload resolution failed. Return nothing.
return 0;
}
// Silence GCC warning
return 0;
}
/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which
/// may occur as part of direct-initialization or copy-initialization.
///
/// \param ClassType the type of the object being initialized, which must have
/// class type.
///
/// \param ArgsPtr the arguments provided to initialize the object
///
/// \param Loc the source location where the initialization occurs
///
/// \param Range the source range that covers the entire initialization
///
/// \param InitEntity the name of the entity being initialized, if known
///
/// \param Kind the type of initialization being performed
///
/// \param ConvertedArgs a vector that will be filled in with the
/// appropriately-converted arguments to the constructor (if initialization
/// succeeded).
///
/// \returns the constructor used to initialize the object, if successful.
/// Otherwise, emits a diagnostic and returns NULL.
CXXConstructorDecl *
Sema::PerformInitializationByConstructor(QualType ClassType,
MultiExprArg ArgsPtr,
SourceLocation Loc, SourceRange Range,
DeclarationName InitEntity,
InitializationKind Kind,
ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) {
// Build the overload candidate set
Expr **Args = (Expr **)ArgsPtr.get();
unsigned NumArgs = ArgsPtr.size();
OverloadCandidateSet CandidateSet;
AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind,
CandidateSet);
OverloadCandidateSet::iterator Best;
switch (BestViableFunction(CandidateSet, Loc, Best)) {
case OR_Success:
// We found a constructor. Break out so that we can convert the arguments
// appropriately.
break;
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 {
const CXXRecordDecl *RD =
cast<CXXRecordDecl>(ClassType->getAs<RecordType>()->getDecl());
Diag(Loc, diag::err_ovl_deleted_init)
<< Best->Function->isDeleted()
<< RD->getDeclName() << Range;
}
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
return 0;
}
// Convert the arguments, fill in default arguments, etc.
CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function);
if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs))
return 0;
return Constructor;
}
/// \brief Given a constructor and the set of arguments provided for the
/// constructor, convert the arguments and add any required default arguments
/// to form a proper call to this constructor.
///
/// \returns true if an error occurred, false otherwise.
bool
Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
MultiExprArg ArgsPtr,
SourceLocation Loc,
ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) {
// FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
unsigned NumArgs = ArgsPtr.size();
Expr **Args = (Expr **)ArgsPtr.get();
const FunctionProtoType *Proto
= Constructor->getType()->getAs<FunctionProtoType>();
assert(Proto && "Constructor without a prototype?");
unsigned NumArgsInProto = Proto->getNumArgs();
// If too few arguments are available, we'll fill in the rest with defaults.
if (NumArgs < NumArgsInProto)
ConvertedArgs.reserve(NumArgsInProto);
else
ConvertedArgs.reserve(NumArgs);
VariadicCallType CallType =
Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
llvm::SmallVector<Expr *, 8> AllArgs;
bool Invalid = GatherArgumentsForCall(Loc, Constructor,
Proto, 0, Args, NumArgs, AllArgs,
CallType);
for (unsigned i =0, size = AllArgs.size(); i < size; i++)
ConvertedArgs.push_back(AllArgs[i]);
return Invalid;
}
/// 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(SourceLocation Loc,
QualType OrigT1, QualType OrigT2,
bool& DerivedToBase) {
assert(!OrigT1->isReferenceType() &&
"T1 must be the pointee type of the reference type");
assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type");
QualType T1 = Context.getCanonicalType(OrigT1);
QualType T2 = Context.getCanonicalType(OrigT2);
QualType UnqualT1 = T1.getLocalUnqualifiedType();
QualType UnqualT2 = T2.getLocalUnqualifiedType();
// 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 (!RequireCompleteType(Loc, OrigT1, PDiag()) &&
!RequireCompleteType(Loc, OrigT2, PDiag()) &&
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.
/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue.
/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion.
/// This is used when this is called from a C-style cast.
bool
Sema::CheckReferenceInit(Expr *&Init, QualType DeclType,
SourceLocation DeclLoc,
bool SuppressUserConversions,
bool AllowExplicit, bool ForceRValue,
ImplicitConversionSequence *ICS,
bool IgnoreBaseAccess) {
assert(DeclType->isReferenceType() && "Reference init needs a reference");
QualType T1 = DeclType->getAs<ReferenceType>()->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, DeclLoc))
return true;
Init = FixOverloadedFunctionReference(Init, Fn);
}
T2 = Fn->getType();
}
}
// Compute some basic properties of the types and the initializer.
bool isRValRef = DeclType->isRValueReferenceType();
bool DerivedToBase = false;
Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression :
Init->isLvalue(Context);
ReferenceCompareResult RefRelationship
= CompareReferenceRelationship(DeclLoc, 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
// Rvalue references cannot bind to lvalues (N2812).
// There is absolutely no situation where they can. In particular, note that
// this is ill-formed, even if B has a user-defined conversion to A&&:
// B b;
// A&& r = b;
if (isRValRef && InitLvalue == Expr::LV_Valid) {
if (!ICS)
Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref)
<< Init->getSourceRange();
return true;
}
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->getBitField()) &&
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;
ICS->Standard.RRefBinding = false;
ICS->Standard.CopyConstructor = 0;
// 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.
CastExpr::CastKind CK = CastExpr::CK_NoOp;
if (DerivedToBase)
CK = CastExpr::CK_DerivedToBase;
else if(CheckExceptionSpecCompatibility(Init, T1))
return true;
ImpCastExprToType(Init, T1, CK, /*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 (!isRValRef && !SuppressUserConversions && T2->isRecordType() &&
!RequireCompleteType(DeclLoc, T2, 0)) {
CXXRecordDecl *T2RecordDecl
= dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl());
OverloadCandidateSet CandidateSet;
const UnresolvedSet *Conversions
= T2RecordDecl->getVisibleConversionFunctions();
for (UnresolvedSet::iterator I = Conversions->begin(),
E = Conversions->end(); I != E; ++I) {
NamedDecl *D = *I;
CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
if (isa<UsingShadowDecl>(D))
D = cast<UsingShadowDecl>(D)->getTargetDecl();
FunctionTemplateDecl *ConvTemplate
= dyn_cast<FunctionTemplateDecl>(D);
CXXConversionDecl *Conv;
if (ConvTemplate)
Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
else
Conv = cast<CXXConversionDecl>(D);
// If the conversion function doesn't return a reference type,
// it can't be considered for this conversion.
if (Conv->getConversionType()->isLValueReferenceType() &&
(AllowExplicit || !Conv->isExplicit())) {
if (ConvTemplate)
AddTemplateConversionCandidate(ConvTemplate, ActingDC,
Init, DeclType, CandidateSet);
else
AddConversionCandidate(Conv, ActingDC, Init, DeclType, CandidateSet);
}
}
OverloadCandidateSet::iterator Best;
switch (BestViableFunction(CandidateSet, DeclLoc, 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;
ICS->UserDefined.EllipsisConversion = false;
assert(ICS->UserDefined.After.ReferenceBinding &&
ICS->UserDefined.After.DirectBinding &&
"Expected a direct reference binding!");
return false;
} else {
OwningExprResult InitConversion =
BuildCXXCastArgument(DeclLoc, QualType(),
CastExpr::CK_UserDefinedConversion,
cast<CXXMethodDecl>(Best->Function),
Owned(Init));
Init = InitConversion.takeAs<Expr>();
if (CheckExceptionSpecCompatibility(Init, T1))
return true;
ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion,
/*isLvalue=*/true);
}
break;
case OR_Ambiguous:
if (ICS) {
for (OverloadCandidateSet::iterator Cand = CandidateSet.begin();
Cand != CandidateSet.end(); ++Cand)
if (Cand->Viable)
ICS->ConversionFunctionSet.push_back(Cand->Function);
break;
}
Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType()
<< Init->getSourceRange();
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
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, DeclLoc,
Init->getSourceRange(),
IgnoreBaseAccess);
else
return false;
}
// -- Otherwise, the reference shall be to a non-volatile const
// type (i.e., cv1 shall be const), or the reference shall be an
// rvalue reference and the initializer expression shall be an rvalue.
if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) {
if (!ICS)
Diag(DeclLoc, diag::err_not_reference_to_const_init)
<< T1 << int(InitLvalue != Expr::LV_Valid)
<< 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.init.ref]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;
ICS->Standard.RRefBinding = isRValRef;
ICS->Standard.CopyConstructor = 0;
} else {
CastExpr::CastKind CK = CastExpr::CK_NoOp;
if (DerivedToBase)
CK = CastExpr::CK_DerivedToBase;
else if(CheckExceptionSpecCompatibility(Init, T1))
return true;
ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false);
}
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(DeclLoc, diag::err_reference_init_drops_quals)
<< T1 << int(InitLvalue != Expr::LV_Valid)
<< 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(DeclLoc, diag::err_typecheck_convert_incompatible)
<< DeclType << Init->getType() << AA_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,
/*AllowExplicit=*/false,
/*ForceRValue=*/false,
/*InOverloadResolution=*/false);
// Of course, that's still a reference binding.
if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) {
ICS->Standard.ReferenceBinding = true;
ICS->Standard.RRefBinding = isRValRef;
} else if (ICS->ConversionKind ==
ImplicitConversionSequence::UserDefinedConversion) {
ICS->UserDefined.After.ReferenceBinding = true;
ICS->UserDefined.After.RRefBinding = isRValRef;
}
return ICS->ConversionKind == ImplicitConversionSequence::BadConversion;
} else {
ImplicitConversionSequence Conversions;
bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing,
false, false,
Conversions);
if (badConversion) {
if ((Conversions.ConversionKind ==
ImplicitConversionSequence::BadConversion)
&& !Conversions.ConversionFunctionSet.empty()) {
Diag(DeclLoc,
diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange();
for (int j = Conversions.ConversionFunctionSet.size()-1;
j >= 0; j--) {
FunctionDecl *Func = Conversions.ConversionFunctionSet[j];
Diag(Func->getLocation(), diag::err_ovl_candidate);
}
}
else {
if (isRValRef)
Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref)
<< Init->getSourceRange();
else
Diag(DeclLoc, diag::err_invalid_initialization)
<< DeclType << Init->getType() << Init->getSourceRange();
}
}
return badConversion;
}
}
static inline bool
CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
const FunctionDecl *FnDecl) {
const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext();
if (isa<NamespaceDecl>(DC)) {
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_declared_in_namespace)
<< FnDecl->getDeclName();
}
if (isa<TranslationUnitDecl>(DC) &&
FnDecl->getStorageClass() == FunctionDecl::Static) {
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_declared_static)
<< FnDecl->getDeclName();
}
return false;
}
static inline bool
CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
CanQualType ExpectedResultType,
CanQualType ExpectedFirstParamType,
unsigned DependentParamTypeDiag,
unsigned InvalidParamTypeDiag) {
QualType ResultType =
FnDecl->getType()->getAs<FunctionType>()->getResultType();
// Check that the result type is not dependent.
if (ResultType->isDependentType())
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_dependent_result_type)
<< FnDecl->getDeclName() << ExpectedResultType;
// Check that the result type is what we expect.
if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_invalid_result_type)
<< FnDecl->getDeclName() << ExpectedResultType;
// A function template must have at least 2 parameters.
if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_template_too_few_parameters)
<< FnDecl->getDeclName();
// The function decl must have at least 1 parameter.
if (FnDecl->getNumParams() == 0)
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_too_few_parameters)
<< FnDecl->getDeclName();
// Check the the first parameter type is not dependent.
QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
if (FirstParamType->isDependentType())
return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
<< FnDecl->getDeclName() << ExpectedFirstParamType;
// Check that the first parameter type is what we expect.
if (SemaRef.Context.getCanonicalType(FirstParamType) !=
ExpectedFirstParamType)
return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
<< FnDecl->getDeclName() << ExpectedFirstParamType;
return false;
}
static bool
CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
// C++ [basic.stc.dynamic.allocation]p1:
// A program is ill-formed if an allocation function is declared in a
// namespace scope other than global scope or declared static in global
// scope.
if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
return true;
CanQualType SizeTy =
SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
// C++ [basic.stc.dynamic.allocation]p1:
// The return type shall be void*. The first parameter shall have type
// std::size_t.
if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
SizeTy,
diag::err_operator_new_dependent_param_type,
diag::err_operator_new_param_type))
return true;
// C++ [basic.stc.dynamic.allocation]p1:
// The first parameter shall not have an associated default argument.
if (FnDecl->getParamDecl(0)->hasDefaultArg())
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_default_arg)
<< FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
return false;
}
static bool
CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
// C++ [basic.stc.dynamic.deallocation]p1:
// A program is ill-formed if deallocation functions are declared in a
// namespace scope other than global scope or declared static in global
// scope.
if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
return true;
// C++ [basic.stc.dynamic.deallocation]p2:
// Each deallocation function shall return void and its first parameter
// shall be void*.
if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy,
SemaRef.Context.VoidPtrTy,
diag::err_operator_delete_dependent_param_type,
diag::err_operator_delete_param_type))
return true;
QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
if (FirstParamType->isDependentType())
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_delete_dependent_param_type)
<< FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy;
if (SemaRef.Context.getCanonicalType(FirstParamType) !=
SemaRef.Context.VoidPtrTy)
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_delete_param_type)
<< FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy;
return false;
}
/// 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.
if (Op == OO_Delete || Op == OO_Array_Delete)
return CheckOperatorDeleteDeclaration(*this, FnDecl);
if (Op == OO_New || Op == OO_Array_New)
return CheckOperatorNewDeclaration(*this, FnDecl);
// 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->isDependentType() || 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)->hasDefaultArg())
return Diag((*Param)->getLocation(),
diag::err_operator_overload_default_arg)
<< FnDecl->getDeclName() << (*Param)->getDefaultArgRange();
}
}
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()->getAs<FunctionProtoType>()->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()->getAs<BuiltinType>())
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::DeclPtrTy 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 DeclPtrTy();
}
// 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 DeclPtrTy::make(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::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S,
DeclPtrTy LinkageSpec,
SourceLocation RBraceLoc) {
if (LinkageSpec)
PopDeclContext();
return LinkageSpec;
}
/// \brief Perform semantic analysis for the variable declaration that
/// occurs within a C++ catch clause, returning the newly-created
/// variable.
VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType,
TypeSourceInfo *TInfo,
IdentifierInfo *Name,
SourceLocation Loc,
SourceRange Range) {
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*.
// N2844 forbids rvalue references.
if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
Diag(Loc, diag::err_catch_rvalue_ref) << Range;
Invalid = true;
}
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->getAs<PointerType>()) {
BaseType = Ptr->getPointeeType();
Mode = 1;
DK = diag::err_catch_incomplete_ptr;
} else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
// For the purpose of error recovery, we treat rvalue refs like lvalue refs.
BaseType = Ref->getPointeeType();
Mode = 2;
DK = diag::err_catch_incomplete_ref;
}
if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
!BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
Invalid = true;
if (!Invalid && !ExDeclType->isDependentType() &&
RequireNonAbstractType(Loc, ExDeclType,
diag::err_abstract_type_in_decl,
AbstractVariableType))
Invalid = true;
// FIXME: Need to test for ability to copy-construct and destroy the
// exception variable.
// FIXME: Need to check for abstract classes.
VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc,
Name, ExDeclType, TInfo, VarDecl::None);
if (Invalid)
ExDecl->setInvalidDecl();
return ExDecl;
}
/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
/// handler.
Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
TypeSourceInfo *TInfo = 0;
QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo);
bool Invalid = D.isInvalidType();
IdentifierInfo *II = D.getIdentifier();
if (NamedDecl *PrevDecl = LookupSingleName(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(DeclPtrTy::make(PrevDecl)));
if (PrevDecl->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
}
}
if (D.getCXXScopeSpec().isSet() && !Invalid) {
Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
<< D.getCXXScopeSpec().getRange();
Invalid = true;
}
VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo,
D.getIdentifier(),
D.getIdentifierLoc(),
D.getDeclSpec().getSourceRange());
if (Invalid)
ExDecl->setInvalidDecl();
// Add the exception declaration into this scope.
if (II)
PushOnScopeChains(ExDecl, S);
else
CurContext->addDecl(ExDecl);
ProcessDeclAttributes(S, ExDecl, D);
return DeclPtrTy::make(ExDecl);
}
Sema::DeclPtrTy 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 DeclPtrTy();
}
if (Value == 0) {
Diag(AssertLoc, diag::err_static_assert_failed)
<< AssertMessage->getString() << AssertExpr->getSourceRange();
}
}
assertexpr.release();
assertmessageexpr.release();
Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc,
AssertExpr, AssertMessage);
CurContext->addDecl(Decl);
return DeclPtrTy::make(Decl);
}
/// Handle a friend type declaration. This works in tandem with
/// ActOnTag.
///
/// Notes on friend class templates:
///
/// We generally treat friend class declarations as if they were
/// declaring a class. So, for example, the elaborated type specifier
/// in a friend declaration is required to obey the restrictions of a
/// class-head (i.e. no typedefs in the scope chain), template
/// parameters are required to match up with simple template-ids, &c.
/// However, unlike when declaring a template specialization, it's
/// okay to refer to a template specialization without an empty
/// template parameter declaration, e.g.
/// friend class A<T>::B<unsigned>;
/// We permit this as a special case; if there are any template
/// parameters present at all, require proper matching, i.e.
/// template <> template <class T> friend class A<int>::B;
Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
MultiTemplateParamsArg TempParams) {
SourceLocation Loc = DS.getSourceRange().getBegin();
assert(DS.isFriendSpecified());
assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
// Try to convert the decl specifier to a type. This works for
// friend templates because ActOnTag never produces a ClassTemplateDecl
// for a TUK_Friend.
Declarator TheDeclarator(DS, Declarator::MemberContext);
QualType T = GetTypeForDeclarator(TheDeclarator, S);
if (TheDeclarator.isInvalidType())
return DeclPtrTy();
// This is definitely an error in C++98. It's probably meant to
// be forbidden in C++0x, too, but the specification is just
// poorly written.
//
// The problem is with declarations like the following:
// template <T> friend A<T>::foo;
// where deciding whether a class C is a friend or not now hinges
// on whether there exists an instantiation of A that causes
// 'foo' to equal C. There are restrictions on class-heads
// (which we declare (by fiat) elaborated friend declarations to
// be) that makes this tractable.
//
// FIXME: handle "template <> friend class A<T>;", which
// is possibly well-formed? Who even knows?
if (TempParams.size() && !isa<ElaboratedType>(T)) {
Diag(Loc, diag::err_tagless_friend_type_template)
<< DS.getSourceRange();
return DeclPtrTy();
}
// C++ [class.friend]p2:
// An elaborated-type-specifier shall be used in a friend declaration
// for a class.*
// * The class-key of the elaborated-type-specifier is required.
// This is one of the rare places in Clang where it's legitimate to
// ask about the "spelling" of the type.
if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) {
// If we evaluated the type to a record type, suggest putting
// a tag in front.
if (const RecordType *RT = T->getAs<RecordType>()) {
RecordDecl *RD = RT->getDecl();
std::string InsertionText = std::string(" ") + RD->getKindName();
Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type)
<< (unsigned) RD->getTagKind()
<< T
<< SourceRange(DS.getFriendSpecLoc())
<< CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(),
InsertionText);
return DeclPtrTy();
}else {
Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend)
<< DS.getSourceRange();
return DeclPtrTy();
}
}
// Enum types cannot be friends.
if (T->getAs<EnumType>()) {
Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend)
<< SourceRange(DS.getFriendSpecLoc());
return DeclPtrTy();
}
// C++98 [class.friend]p1: A friend of a class is a function
// or class that is not a member of the class . . .
// But that's a silly restriction which nobody implements for
// inner classes, and C++0x removes it anyway, so we only report
// this (as a warning) if we're being pedantic.
if (!getLangOptions().CPlusPlus0x)
if (const RecordType *RT = T->getAs<RecordType>())
if (RT->getDecl()->getDeclContext() == CurContext)
Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class);
Decl *D;
if (TempParams.size())
D = FriendTemplateDecl::Create(Context, CurContext, Loc,
TempParams.size(),
(TemplateParameterList**) TempParams.release(),
T.getTypePtr(),
DS.getFriendSpecLoc());
else
D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(),
DS.getFriendSpecLoc());
D->setAccess(AS_public);
CurContext->addDecl(D);
return DeclPtrTy::make(D);
}
Sema::DeclPtrTy
Sema::ActOnFriendFunctionDecl(Scope *S,
Declarator &D,
bool IsDefinition,
MultiTemplateParamsArg TemplateParams) {
const DeclSpec &DS = D.getDeclSpec();
assert(DS.isFriendSpecified());
assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
SourceLocation Loc = D.getIdentifierLoc();
TypeSourceInfo *TInfo = 0;
QualType T = GetTypeForDeclarator(D, S, &TInfo);
// C++ [class.friend]p1
// A friend of a class is a function or class....
// Note that this sees through typedefs, which is intended.
// It *doesn't* see through dependent types, which is correct
// according to [temp.arg.type]p3:
// If a declaration acquires a function type through a
// type dependent on a template-parameter and this causes
// a declaration that does not use the syntactic form of a
// function declarator to have a function type, the program
// is ill-formed.
if (!T->isFunctionType()) {
Diag(Loc, diag::err_unexpected_friend);
// It might be worthwhile to try to recover by creating an
// appropriate declaration.
return DeclPtrTy();
}
// 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.
// - The name of the friend is not found by simple name lookup
// until a matching declaration is provided in that namespace
// scope (either before or after the class declaration granting
// friendship).
// - If a friend function is called, its name may be found by the
// name lookup that considers functions from namespaces and
// classes associated with the types of the function arguments.
// - When looking for a prior declaration of a class or a function
// declared as a friend, scopes outside the innermost enclosing
// namespace scope are not considered.
CXXScopeSpec &ScopeQual = D.getCXXScopeSpec();
DeclarationName Name = GetNameForDeclarator(D);
assert(Name);
// The context we found the declaration in, or in which we should
// create the declaration.
DeclContext *DC;
// FIXME: handle local classes
// Recover from invalid scope qualifiers as if they just weren't there.
LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName,
ForRedeclaration);
if (!ScopeQual.isInvalid() && ScopeQual.isSet()) {
// FIXME: RequireCompleteDeclContext
DC = computeDeclContext(ScopeQual);
// FIXME: handle dependent contexts
if (!DC) return DeclPtrTy();
LookupQualifiedName(Previous, DC);
// If searching in that context implicitly found a declaration in
// a different context, treat it like it wasn't found at all.
// TODO: better diagnostics for this case. Suggesting the right
// qualified scope would be nice...
// FIXME: getRepresentativeDecl() is not right here at all
if (Previous.empty() ||
!Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) {
D.setInvalidType();
Diag(Loc, diag::err_qualified_friend_not_found) << Name << T;
return DeclPtrTy();
}
// C++ [class.friend]p1: A friend of a class is a function or
// class that is not a member of the class . . .
if (DC->Equals(CurContext))
Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member);
// Otherwise walk out to the nearest namespace scope looking for matches.
} else {
// TODO: handle local class contexts.
DC = CurContext;
while (true) {
// Skip class contexts. If someone can cite chapter and verse
// for this behavior, that would be nice --- it's what GCC and
// EDG do, and it seems like a reasonable intent, but the spec
// really only says that checks for unqualified existing
// declarations should stop at the nearest enclosing namespace,
// not that they should only consider the nearest enclosing
// namespace.
while (DC->isRecord())
DC = DC->getParent();
LookupQualifiedName(Previous, DC);
// TODO: decide what we think about using declarations.
if (!Previous.empty())
break;
if (DC->isFileContext()) break;
DC = DC->getParent();
}
// C++ [class.friend]p1: A friend of a class is a function or
// class that is not a member of the class . . .
// C++0x changes this for both friend types and functions.
// Most C++ 98 compilers do seem to give an error here, so
// we do, too.
if (!Previous.empty() && DC->Equals(CurContext)
&& !getLangOptions().CPlusPlus0x)
Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member);
}
if (DC->isFileContext()) {
// This implies that it has to be an operator or function.
if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ||
D.getName().getKind() == UnqualifiedId::IK_DestructorName ||
D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) {
Diag(Loc, diag::err_introducing_special_friend) <<
(D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 :
D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2);
return DeclPtrTy();
}
}
bool Redeclaration = false;
NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous,
move(TemplateParams),
IsDefinition,
Redeclaration);
if (!ND) return DeclPtrTy();
assert(ND->getDeclContext() == DC);
assert(ND->getLexicalDeclContext() == CurContext);
// Add the function declaration to the appropriate lookup tables,
// adjusting the redeclarations list as necessary. We don't
// want to do this yet if the friending class is dependent.
//
// Also update the scope-based lookup if the target context's
// lookup context is in lexical scope.
if (!CurContext->isDependentContext()) {
DC = DC->getLookupContext();
DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false);
if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
}
FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
D.getIdentifierLoc(), ND,
DS.getFriendSpecLoc());
FrD->setAccess(AS_public);
CurContext->addDecl(FrD);
return DeclPtrTy::make(ND);
}
void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) {
AdjustDeclIfTemplate(dcl);
Decl *Dcl = dcl.getAs<Decl>();
FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl);
if (!Fn) {
Diag(DelLoc, diag::err_deleted_non_function);
return;
}
if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) {
Diag(DelLoc, diag::err_deleted_decl_not_first);
Diag(Prev->getLocation(), diag::note_previous_declaration);
// If the declaration wasn't the first, we delete the function anyway for
// recovery.
}
Fn->setDeleted();
}
static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E;
++CI) {
Stmt *SubStmt = *CI;
if (!SubStmt)
continue;
if (isa<ReturnStmt>(SubStmt))
Self.Diag(SubStmt->getSourceRange().getBegin(),
diag::err_return_in_constructor_handler);
if (!isa<Expr>(SubStmt))
SearchForReturnInStmt(Self, SubStmt);
}
}
void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
CXXCatchStmt *Handler = TryBlock->getHandler(I);
SearchForReturnInStmt(*this, Handler);
}
}
bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
const CXXMethodDecl *Old) {
QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType();
QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType();
QualType CNewTy = Context.getCanonicalType(NewTy);
QualType COldTy = Context.getCanonicalType(OldTy);
if (CNewTy == COldTy &&
CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers())
return false;
// Check if the return types are covariant
QualType NewClassTy, OldClassTy;
/// Both types must be pointers or references to classes.
if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) {
if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) {
NewClassTy = NewPT->getPointeeType();
OldClassTy = OldPT->getPointeeType();
}
} else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) {
if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) {
NewClassTy = NewRT->getPointeeType();
OldClassTy = OldRT->getPointeeType();
}
}
// The return types aren't either both pointers or references to a class type.
if (NewClassTy.isNull()) {
Diag(New->getLocation(),
diag::err_different_return_type_for_overriding_virtual_function)
<< New->getDeclName() << NewTy << OldTy;
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
}
if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
// Check if the new class derives from the old class.
if (!IsDerivedFrom(NewClassTy, OldClassTy)) {
Diag(New->getLocation(),
diag::err_covariant_return_not_derived)
<< New->getDeclName() << NewTy << OldTy;
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
}
// Check if we the conversion from derived to base is valid.
if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy,
diag::err_covariant_return_inaccessible_base,
diag::err_covariant_return_ambiguous_derived_to_base_conv,
// FIXME: Should this point to the return type?
New->getLocation(), SourceRange(), New->getDeclName())) {
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
}
}
// The qualifiers of the return types must be the same.
if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) {
Diag(New->getLocation(),
diag::err_covariant_return_type_different_qualifications)
<< New->getDeclName() << NewTy << OldTy;
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
};
// The new class type must have the same or less qualifiers as the old type.
if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
Diag(New->getLocation(),
diag::err_covariant_return_type_class_type_more_qualified)
<< New->getDeclName() << NewTy << OldTy;
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
};
return false;
}
bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
const CXXMethodDecl *Old)
{
if (Old->hasAttr<FinalAttr>()) {
Diag(New->getLocation(), diag::err_final_function_overridden)
<< New->getDeclName();
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
}
return false;
}
/// \brief Mark the given method pure.
///
/// \param Method the method to be marked pure.
///
/// \param InitRange the source range that covers the "0" initializer.
bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
Method->setPure();
// A class is abstract if at least one function is pure virtual.
Method->getParent()->setAbstract(true);
return false;
}
if (!Method->isInvalidDecl())
Diag(Method->getLocation(), diag::err_non_virtual_pure)
<< Method->getDeclName() << InitRange;
return true;
}
/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an
/// initializer for the declaration 'Dcl'.
/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
/// static data member of class X, names should be looked up in the scope of
/// class X.
void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) {
AdjustDeclIfTemplate(Dcl);
Decl *D = Dcl.getAs<Decl>();
// If there is no declaration, there was an error parsing it.
if (D == 0)
return;
// Check whether it is a declaration with a nested name specifier like
// int foo::bar;
if (!D->isOutOfLine())
return;
// C++ [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.
// Change current context into the context of the initializing declaration.
EnterDeclaratorContext(S, D->getDeclContext());
}
/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
/// initializer for the declaration 'Dcl'.
void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) {
AdjustDeclIfTemplate(Dcl);
Decl *D = Dcl.getAs<Decl>();
// If there is no declaration, there was an error parsing it.
if (D == 0)
return;
// Check whether it is a declaration with a nested name specifier like
// int foo::bar;
if (!D->isOutOfLine())
return;
assert(S->getEntity() == D->getDeclContext() && "Context imbalance!");
ExitDeclaratorContext(S);
}
/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
/// C++ if/switch/while/for statement.
/// e.g: "if (int x = f()) {...}"
Action::DeclResult
Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
// C++ 6.4p2:
// The declarator shall not specify a function or an array.
// The type-specifier-seq shall not contain typedef and shall not declare a
// new class or enumeration.
assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
"Parser allowed 'typedef' as storage class of condition decl.");
TypeSourceInfo *TInfo = 0;
TagDecl *OwnedTag = 0;
QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag);
if (Ty->isFunctionType()) { // The declarator shall not specify a function...
// We exit without creating a CXXConditionDeclExpr because a FunctionDecl
// would be created and CXXConditionDeclExpr wants a VarDecl.
Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type)
<< D.getSourceRange();
return DeclResult();
} else if (OwnedTag && OwnedTag->isDefinition()) {
// The type-specifier-seq shall not declare a new class or enumeration.
Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition);
}
DeclPtrTy Dcl = ActOnDeclarator(S, D);
if (!Dcl)
return DeclResult();
VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>());
VD->setDeclaredInCondition(true);
return Dcl;
}
void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc,
CXXMethodDecl *MD) {
// Ignore dependent types.
if (MD->isDependentContext())
return;
CXXRecordDecl *RD = MD->getParent();
// Ignore classes without a vtable.
if (!RD->isDynamicClass())
return;
if (!MD->isOutOfLine()) {
// The only inline functions we care about are constructors. We also defer
// marking the virtual members as referenced until we've reached the end
// of the translation unit. We do this because we need to know the key
// function of the class in order to determine the key function.
if (isa<CXXConstructorDecl>(MD))
ClassesWithUnmarkedVirtualMembers.insert(std::make_pair(RD, Loc));
return;
}
const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD);
if (!KeyFunction) {
// This record does not have a key function, so we assume that the vtable
// will be emitted when it's used by the constructor.
if (!isa<CXXConstructorDecl>(MD))
return;
} else if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) {
// We don't have the right key function.
return;
}
// Mark the members as referenced.
MarkVirtualMembersReferenced(Loc, RD);
ClassesWithUnmarkedVirtualMembers.erase(RD);
}
bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() {
if (ClassesWithUnmarkedVirtualMembers.empty())
return false;
for (std::map<CXXRecordDecl *, SourceLocation>::iterator i =
ClassesWithUnmarkedVirtualMembers.begin(),
e = ClassesWithUnmarkedVirtualMembers.end(); i != e; ++i) {
CXXRecordDecl *RD = i->first;
const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD);
if (KeyFunction) {
// We know that the class has a key function. If the key function was
// declared in this translation unit, then it the class decl would not
// have been in the ClassesWithUnmarkedVirtualMembers map.
continue;
}
SourceLocation Loc = i->second;
MarkVirtualMembersReferenced(Loc, RD);
}
ClassesWithUnmarkedVirtualMembers.clear();
return true;
}
void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) {
for (CXXRecordDecl::method_iterator i = RD->method_begin(),
e = RD->method_end(); i != e; ++i) {
CXXMethodDecl *MD = *i;
// C++ [basic.def.odr]p2:
// [...] A virtual member function is used if it is not pure. [...]
if (MD->isVirtual() && !MD->isPure())
MarkDeclarationReferenced(Loc, MD);
}
}