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clang-1/lib/Sema/SemaDeclCXX.cpp

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Этот файл содержит неоднозначные символы Юникода!

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//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements semantic analysis for C++ declarations.
//
//===----------------------------------------------------------------------===//
#include "Sema.h"
#include "SemaInherit.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/AST/TypeOrdering.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Parse/DeclSpec.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Compiler.h"
#include <algorithm> // for std::equal
#include <map>
using namespace clang;
//===----------------------------------------------------------------------===//
// CheckDefaultArgumentVisitor
//===----------------------------------------------------------------------===//
namespace {
/// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
/// the default argument of a parameter to determine whether it
/// contains any ill-formed subexpressions. For example, this will
/// diagnose the use of local variables or parameters within the
/// default argument expression.
class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor
: public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
Expr *DefaultArg;
Sema *S;
public:
CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
: DefaultArg(defarg), S(s) {}
bool VisitExpr(Expr *Node);
bool VisitDeclRefExpr(DeclRefExpr *DRE);
bool VisitCXXThisExpr(CXXThisExpr *ThisE);
};
/// VisitExpr - Visit all of the children of this expression.
bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
bool IsInvalid = false;
for (Stmt::child_iterator I = Node->child_begin(),
E = Node->child_end(); I != E; ++I)
IsInvalid |= Visit(*I);
return IsInvalid;
}
/// VisitDeclRefExpr - Visit a reference to a declaration, to
/// determine whether this declaration can be used in the default
/// argument expression.
bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
NamedDecl *Decl = DRE->getDecl();
if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
// C++ [dcl.fct.default]p9
// Default arguments are evaluated each time the function is
// called. The order of evaluation of function arguments is
// unspecified. Consequently, parameters of a function shall not
// be used in default argument expressions, even if they are not
// evaluated. Parameters of a function declared before a default
// argument expression are in scope and can hide namespace and
// class member names.
return S->Diag(DRE->getSourceRange().getBegin(),
diag::err_param_default_argument_references_param)
<< Param->getDeclName() << DefaultArg->getSourceRange();
} else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
// C++ [dcl.fct.default]p7
// Local variables shall not be used in default argument
// expressions.
if (VDecl->isBlockVarDecl())
return S->Diag(DRE->getSourceRange().getBegin(),
diag::err_param_default_argument_references_local)
<< VDecl->getDeclName() << DefaultArg->getSourceRange();
}
return false;
}
/// VisitCXXThisExpr - Visit a C++ "this" expression.
bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
// C++ [dcl.fct.default]p8:
// The keyword this shall not be used in a default argument of a
// member function.
return S->Diag(ThisE->getSourceRange().getBegin(),
diag::err_param_default_argument_references_this)
<< ThisE->getSourceRange();
}
}
/// ActOnParamDefaultArgument - Check whether the default argument
/// provided for a function parameter is well-formed. If so, attach it
/// to the parameter declaration.
void
Sema::ActOnParamDefaultArgument(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;
}
// C++ [dcl.fct.default]p5
// A default argument expression is implicitly converted (clause
// 4) to the parameter type. The default argument expression has
// the same semantic constraints as the initializer expression in
// a declaration of a variable of the parameter type, using the
// copy-initialization semantics (8.5).
Expr *DefaultArgPtr = DefaultArg.get();
bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType,
EqualLoc,
Param->getDeclName(),
/*DirectInit=*/false);
if (DefaultArgPtr != DefaultArg.get()) {
DefaultArg.take();
DefaultArg.reset(DefaultArgPtr);
}
if (DefaultInitFailed) {
return;
}
// Check that the default argument is well-formed
CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this);
if (DefaultArgChecker.Visit(DefaultArg.get())) {
Param->setInvalidDecl();
return;
}
DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(),
/*DestroyTemps=*/false);
// Okay: add the default argument to the parameter
Param->setDefaultArg(DefaultArgPtr);
}
/// 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).
for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) {
ParmVarDecl *OldParam = Old->getParamDecl(p);
ParmVarDecl *NewParam = New->getParamDecl(p);
if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) {
Diag(NewParam->getLocation(),
diag::err_param_default_argument_redefinition)
<< NewParam->getDefaultArg()->getSourceRange();
Diag(OldParam->getLocation(), diag::note_previous_definition);
Invalid = true;
} else if (OldParam->getDefaultArg()) {
// Merge the old default argument into the new parameter
NewParam->setDefaultArg(OldParam->getDefaultArg());
}
}
if (CheckEquivalentExceptionSpec(
Old->getType()->getAsFunctionProtoType(), Old->getLocation(),
New->getType()->getAsFunctionProtoType(), 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->getDefaultArg())
break;
}
// C++ [dcl.fct.default]p4:
// In a given function declaration, all parameters
// subsequent to a parameter with a default argument shall
// have default arguments supplied in this or previous
// declarations. A default argument shall not be redefined
// by a later declaration (not even to the same value).
unsigned LastMissingDefaultArg = 0;
for(; p < NumParams; ++p) {
ParmVarDecl *Param = FD->getParamDecl(p);
if (!Param->getDefaultArg()) {
if (Param->isInvalidDecl())
/* We already complained about this parameter. */;
else if (Param->getIdentifier())
Diag(Param->getLocation(),
diag::err_param_default_argument_missing_name)
<< Param->getIdentifier();
else
Diag(Param->getLocation(),
diag::err_param_default_argument_missing);
LastMissingDefaultArg = p;
}
}
if (LastMissingDefaultArg > 0) {
// Some default arguments were missing. Clear out all of the
// default arguments up to (and including) the last missing
// default argument, so that we leave the function parameters
// in a semantically valid state.
for (p = 0; p <= LastMissingDefaultArg; ++p) {
ParmVarDecl *Param = FD->getParamDecl(p);
if (Param->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);
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, 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");
if (!CXXBaseDecl->isEmpty())
Class->setEmpty(false);
if (CXXBaseDecl->isPolymorphic())
Class->setPolymorphic(true);
// C++ [dcl.init.aggr]p1:
// An aggregate is [...] a class with [...] no base classes [...].
Class->setAggregate(false);
Class->setPOD(false);
if (Virtual) {
// 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 (!cast<CXXRecordDecl>(BaseDecl)->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 (!cast<CXXRecordDecl>(BaseDecl)->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 (!cast<CXXRecordDecl>(BaseDecl)->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 (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor())
Class->setHasTrivialDestructor(false);
// Create the base specifier.
// FIXME: Allocate via ASTContext?
return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
Class->getTagKind() == RecordDecl::TK_class,
Access, BaseType);
}
/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
/// one entry in the base class list of a class specifier, for
/// example:
/// class foo : public bar, virtual private baz {
/// 'public bar' and 'virtual private baz' are each base-specifiers.
Sema::BaseResult
Sema::ActOnBaseSpecifier(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 = QualType::getFromOpaquePtr(basetype);
if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
Virtual, Access,
BaseType, BaseLoc))
return BaseSpec;
return true;
}
/// \brief Performs the actual work of attaching the given base class
/// specifiers to a C++ class.
bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
unsigned NumBases) {
if (NumBases == 0)
return false;
// Used to keep track of which base types we have already seen, so
// that we can properly diagnose redundant direct base types. Note
// that the key is always the unqualified canonical type of the base
// class.
std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
// Copy non-redundant base specifiers into permanent storage.
unsigned NumGoodBases = 0;
bool Invalid = false;
for (unsigned idx = 0; idx < NumBases; ++idx) {
QualType NewBaseType
= Context.getCanonicalType(Bases[idx]->getType());
NewBaseType = NewBaseType.getUnqualifiedType();
if (KnownBaseTypes[NewBaseType]) {
// C++ [class.mi]p3:
// A class shall not be specified as a direct base class of a
// derived class more than once.
Diag(Bases[idx]->getSourceRange().getBegin(),
diag::err_duplicate_base_class)
<< KnownBaseTypes[NewBaseType]->getType()
<< Bases[idx]->getSourceRange();
// Delete the duplicate base class specifier; we're going to
// overwrite its pointer later.
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);
}
//===----------------------------------------------------------------------===//
// 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,
ExprTy *BW, ExprTy *InitExpr, 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 = QualType::getFromOpaquePtr(DS.getTypeRep());
isFunc = TDType->isFunctionType();
}
bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
!isFunc);
Decl *Member;
if (isInstField) {
Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth,
AS);
assert(Member && "HandleField never returns null");
} else {
Member = ActOnDeclarator(S, D).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);
}
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;
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
// constructor’s class and, if not found in that scope, are looked
// up in the scope containing the constructor’s
// definition. [Note: if the constructor’s class contains a member
// with the same name as a direct or virtual base class of the
// class, a mem-initializer-id naming the member or base class and
// composed of a single identifier refers to the class member. A
// mem-initializer-id for the hidden base class may be specified
// using a qualified name. ]
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,
RParenLoc);
}
// It didn't name a member, so see if it names a class.
TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy
: getTypeName(*MemberOrBase, IdLoc, S, &SS);
if (!BaseTy)
return Diag(IdLoc, diag::err_mem_init_not_member_or_class)
<< MemberOrBase << SourceRange(IdLoc, RParenLoc);
QualType BaseType = QualType::getFromOpaquePtr(BaseTy);
return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc,
RParenLoc, ClassDecl);
}
Sema::MemInitResult
Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args,
unsigned NumArgs, SourceLocation IdLoc,
SourceLocation RParenLoc) {
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->getAs<RecordType>()) {
if (!HasDependentArg)
C = PerformInitializationByConstructor(
FieldType, (Expr **)Args, NumArgs, IdLoc,
SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct);
} else if (NumArgs != 1) {
return Diag(IdLoc, diag::err_mem_initializer_mismatch)
<< Member->getDeclName() << SourceRange(IdLoc, RParenLoc);
} else if (!HasDependentArg) {
Expr *NewExp = (Expr*)Args[0];
if (PerformCopyInitialization(NewExp, FieldType, "passing"))
return true;
Args[0] = NewExp;
}
// FIXME: Perform direct initialization of the member.
return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args,
NumArgs, C, IdLoc);
}
Sema::MemInitResult
Sema::BuildBaseInitializer(QualType BaseType, Expr **Args,
unsigned NumArgs, SourceLocation IdLoc,
SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) {
bool HasDependentArg = false;
for (unsigned i = 0; i < NumArgs; i++)
HasDependentArg |= Args[i]->isTypeDependent();
if (!BaseType->isDependentType()) {
if (!BaseType->isRecordType())
return Diag(IdLoc, diag::err_base_init_does_not_name_class)
<< BaseType << SourceRange(IdLoc, RParenLoc);
// C++ [class.base.init]p2:
// [...] Unless the mem-initializer-id names a nonstatic data
// member of the constructor’s class or a direct or virtual base
// of that class, the mem-initializer is ill-formed. A
// mem-initializer-list can initialize a base class using any
// name that denotes that base class type.
// First, check for a direct base class.
const CXXBaseSpecifier *DirectBaseSpec = 0;
for (CXXRecordDecl::base_class_const_iterator Base =
ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) {
if (Context.getCanonicalType(BaseType).getUnqualifiedType() ==
Context.getCanonicalType(Base->getType()).getUnqualifiedType()) {
// We found a direct base of this type. That's what we're
// initializing.
DirectBaseSpec = &*Base;
break;
}
}
// Check for a virtual base class.
// FIXME: We might be able to short-circuit this if we know in advance that
// there are no virtual bases.
const CXXBaseSpecifier *VirtualBaseSpec = 0;
if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
// We haven't found a base yet; search the class hierarchy for a
// virtual base class.
BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
/*DetectVirtual=*/false);
if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) {
for (BasePaths::paths_iterator Path = Paths.begin();
Path != Paths.end(); ++Path) {
if (Path->back().Base->isVirtual()) {
VirtualBaseSpec = Path->back().Base;
break;
}
}
}
}
// C++ [base.class.init]p2:
// If a mem-initializer-id is ambiguous because it designates both
// a direct non-virtual base class and an inherited virtual base
// class, the mem-initializer is ill-formed.
if (DirectBaseSpec && VirtualBaseSpec)
return Diag(IdLoc, diag::err_base_init_direct_and_virtual)
<< BaseType << SourceRange(IdLoc, RParenLoc);
// 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(IdLoc, diag::err_not_direct_base_or_virtual)
<< BaseType << ClassDecl->getNameAsCString()
<< SourceRange(IdLoc, RParenLoc);
}
CXXConstructorDecl *C = 0;
if (!BaseType->isDependentType() && !HasDependentArg) {
DeclarationName Name = Context.DeclarationNames.getCXXConstructorName(
Context.getCanonicalType(BaseType));
C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs,
IdLoc, SourceRange(IdLoc, RParenLoc),
Name, IK_Direct);
}
return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args,
NumArgs, C, IdLoc);
}
void
Sema::BuildBaseOrMemberInitializers(ASTContext &C,
CXXConstructorDecl *Constructor,
CXXBaseOrMemberInitializer **Initializers,
unsigned NumInitializers
) {
llvm::SmallVector<CXXBaseSpecifier *, 4>Bases;
llvm::SmallVector<FieldDecl *, 4>Members;
Constructor->setBaseOrMemberInitializers(C,
Initializers, NumInitializers,
Bases, Members);
for (unsigned int i = 0; i < Bases.size(); i++)
Diag(Bases[i]->getSourceRange().getBegin(),
diag::err_missing_default_constructor) << 0 << Bases[i]->getType();
for (unsigned int i = 0; i < Members.size(); i++)
Diag(Members[i]->getLocation(), diag::err_missing_default_constructor)
<< 1 << Members[i]->getType();
}
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 *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 (FieldDecl *Field = Member->getMember()) {
// After BuildBaseOrMemberInitializers 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 static_cast<RecordType *>(Member->getBaseClass());
}
void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
SourceLocation ColonLoc,
MemInitTy **MemInits, unsigned NumMemInits) {
if (!ConstructorDecl)
return;
CXXConstructorDecl *Constructor
= dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>());
if (!Constructor) {
Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
return;
}
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();
else {
Type *BaseClass = Member->getBaseClass();
assert(BaseClass && "ActOnMemInitializers - neither field or base");
Diag(Member->getSourceLocation(),
diag::error_multiple_base_initialization)
<< BaseClass->getDesugaredType(true);
}
Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer)
<< 0;
err = true;
}
if (!err)
BuildBaseOrMemberInitializers(Context, Constructor,
reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits),
NumMemInits);
if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized)
!= Diagnostic::Ignored ||
Diags.getDiagnosticLevel(diag::warn_field_initialized)
!= Diagnostic::Ignored)) {
// 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(VBase->getType()->getAs<RecordType>());
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(Base->getType()->getAs<RecordType>());
}
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)
<< BaseClass->getDesugaredType(true);
} 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
<< BaseClass->getDesugaredType(true);
}
for (curIndex = 0; curIndex < Last; curIndex++)
if (MemberInCtorList == AllBaseOrMembers[curIndex])
break;
}
PrevMember = Member;
}
}
}
void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) {
if (!CDtorDecl)
return;
if (CXXConstructorDecl *Constructor
= dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>()))
BuildBaseOrMemberInitializers(Context,
Constructor,
(CXXBaseOrMemberInitializer **)0, 0);
}
namespace {
/// PureVirtualMethodCollector - traverses a class and its superclasses
/// and determines if it has any pure virtual methods.
class VISIBILITY_HIDDEN 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);
continue;
}
// Otherwise, 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 (!getLangOptions().CPlusPlus)
return false;
if (const ArrayType *AT = Context.getAsArrayType(T))
return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID,
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(), DiagID, SelID,
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, DiagID) << RD->getDeclName() << SelID;
// 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 VISIBILITY_HIDDEN 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()->getAsFunctionType()->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;
}
};
}
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);
CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>());
if (!RD->isAbstract()) {
// Collect all the pure virtual methods and see if this is an abstract
// class after all.
PureVirtualMethodCollector Collector(Context, RD);
if (!Collector.empty())
RD->setAbstract(true);
}
if (RD->isAbstract())
AbstractClassUsageDiagnoser(*this, RD);
if (!RD->isDependentType())
AddImplicitlyDeclaredMembersToClass(RD);
}
/// 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),
/*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),
/*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, 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) {
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),
/*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, VarDecl::None, 0);
CopyAssignment->setParams(Context, &FromParam, 1);
// Don't call addedAssignmentOperator. There is no way to distinguish an
// implicit from an explicit assignment operator.
ClassDecl->addDecl(CopyAssignment);
}
if (!ClassDecl->hasUserDeclaredDestructor()) {
// C++ [class.dtor]p2:
// If a class has no user-declared destructor, a destructor is
// declared implicitly. An implicitly-declared destructor is an
// inline public member of its class.
DeclarationName Name
= Context.DeclarationNames.getCXXDestructorName(ClassType);
CXXDestructorDecl *Destructor
= CXXDestructorDecl::Create(Context, ClassDecl,
ClassDecl->getLocation(), Name,
Context.getFunctionType(Context.VoidTy,
0, 0, false, 0),
/*isInline=*/true,
/*isImplicitlyDeclared=*/true);
Destructor->setAccess(AS_public);
Destructor->setImplicit();
Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
ClassDecl->addDecl(Destructor);
}
}
void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) {
TemplateDecl *Template = TemplateD.getAs<TemplateDecl>();
if (!Template)
return;
TemplateParameterList *Params = Template->getTemplateParameters();
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;
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;
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 & QualType::Const)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "const" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & QualType::Volatile)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "volatile" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & QualType::Restrict)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "restrict" << SourceRange(D.getIdentifierLoc());
}
// Rebuild the function type "R" without any type qualifiers (in
// case any of the errors above fired) and with "void" as the
// return type, since constructors don't have return types. We
// *always* have to do this, because GetTypeForDeclarator will
// put in a result type of "int" when none was specified.
const FunctionProtoType *Proto = R->getAsFunctionProtoType();
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()))) {
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 &");
Constructor->setInvalidDecl();
}
}
// Notify the class that we've added a constructor.
ClassDecl->addedConstructor(Context, Constructor);
}
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 = QualType::getFromOpaquePtr(D.getDeclaratorIdType());
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 & QualType::Const)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "const" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & QualType::Volatile)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "volatile" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & QualType::Restrict)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "restrict" << SourceRange(D.getIdentifierLoc());
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->getAsFunctionProtoType()->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->getAsFunctionProtoType()->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 = QualType::getFromOpaquePtr(D.getDeclaratorIdType());
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->getAsFunctionProtoType()->getTypeQuals());
// C++0x explicit conversion operators.
if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x)
Diag(D.getDeclSpec().getExplicitSpecLoc(),
diag::warn_explicit_conversion_functions)
<< SourceRange(D.getDeclSpec().getExplicitSpecLoc());
}
/// 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");
// Set the lexical context of this conversion function
Conversion->setLexicalDeclContext(CurContext);
CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
// Make sure we aren't redeclaring the conversion function.
QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
// C++ [class.conv.fct]p1:
// [...] A conversion function is never used to convert a
// (possibly cv-qualified) object to the (possibly cv-qualified)
// same object type (or a reference to it), to a (possibly
// cv-qualified) base class of that type (or a reference to it),
// or to (possibly cv-qualified) void.
// FIXME: Suppress this warning if the conversion function ends up being a
// virtual function that overrides a virtual function in a base class.
QualType ClassType
= Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
if (const ReferenceType *ConvTypeRef = ConvType->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()) {
OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions();
for (OverloadedFunctionDecl::function_iterator
Conv = Conversions->function_begin(),
ConvEnd = Conversions->function_end();
Conv != ConvEnd; ++Conv) {
if (*Conv
== cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) {
*Conv = Conversion;
return DeclPtrTy::make(Conversion);
}
}
assert(Conversion->isInvalidDecl() && "Conversion should not get here.");
} else
ClassDecl->addConversionFunction(Context, 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 = LookupName(DeclRegionScope, II, LookupOrdinaryName,
true);
if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) {
// This is an extended namespace definition.
// Attach this namespace decl to the chain of extended namespace
// definitions.
OrigNS->setNextNamespace(Namespc);
Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace());
// Remove the previous declaration from the scope.
if (DeclRegionScope->isDeclScope(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.
}
PushOnScopeChains(Namespc, DeclRegionScope);
} else {
// FIXME: Handle anonymous namespaces
}
// Although we could have an invalid decl (i.e. the namespace name is a
// redefinition), push it as current DeclContext and try to continue parsing.
// FIXME: We should be able to push Namespc here, so that the each DeclContext
// for the namespace has the declarations that showed up in that particular
// namespace definition.
PushDeclContext(NamespcScope, Namespc);
return DeclPtrTy::make(Namespc);
}
/// 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 = LookupParsedName(S, &SS, NamespcName,
LookupNamespaceName, false);
if (R.isAmbiguous()) {
DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc);
return DeclPtrTy();
}
if (NamedDecl *NS = R) {
assert(isa<NamespaceDecl>(NS) && "expected namespace decl");
// C++ [namespace.udir]p1:
// A using-directive specifies that the names in the nominated
// namespace can be used in the scope in which the
// using-directive appears after the using-directive. During
// unqualified name lookup (3.4.1), the names appear as if they
// were declared in the nearest enclosing namespace which
// contains both the using-directive and the nominated
// namespace. [Note: in this context, "contains" means "contains
// directly or indirectly". ]
// Find enclosing context containing both using-directive and
// nominated namespace.
DeclContext *CommonAncestor = cast<DeclContext>(NS);
while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
CommonAncestor = CommonAncestor->getParent();
UDir = UsingDirectiveDecl::Create(Context,
CurContext, UsingLoc,
NamespcLoc,
SS.getRange(),
(NestedNameSpecifier *)SS.getScopeRep(),
IdentLoc,
cast<NamespaceDecl>(NS),
CommonAncestor);
PushUsingDirective(S, UDir);
} else {
Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
}
// FIXME: We ignore attributes for now.
delete AttrList;
return 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,
SourceLocation UsingLoc,
const CXXScopeSpec &SS,
SourceLocation IdentLoc,
IdentifierInfo *TargetName,
OverloadedOperatorKind Op,
AttributeList *AttrList,
bool IsTypeName) {
assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
assert((TargetName || Op) && "Invalid TargetName.");
assert(IdentLoc.isValid() && "Invalid TargetName location.");
assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
UsingDecl *UsingAlias = 0;
DeclarationName Name;
if (TargetName)
Name = TargetName;
else
Name = Context.DeclarationNames.getCXXOperatorName(Op);
// Lookup target name.
LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false);
if (NamedDecl *NS = R) {
if (IsTypeName && !isa<TypeDecl>(NS)) {
Diag(IdentLoc, diag::err_using_typename_non_type);
}
UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(),
NS->getLocation(), UsingLoc, NS,
static_cast<NestedNameSpecifier *>(SS.getScopeRep()),
IsTypeName);
PushOnScopeChains(UsingAlias, S);
} else {
Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange();
}
// FIXME: We ignore attributes for now.
delete AttrList;
return DeclPtrTy::make(UsingAlias);
}
/// 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);
}
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 = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false);
// Check if we have a previous declaration with the same name.
if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) {
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() && AD->getNamespace() == getNamespaceDecl(R))
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()) {
DiagnoseAmbiguousLookup(R, Ident, IdentLoc);
return DeclPtrTy();
}
if (!R) {
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);
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");
// Before the implicitly-declared default constructor for a class is
// implicitly defined, all the implicitly-declared default constructors
// for its base class and its non-static 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 (!BaseClassDecl->hasTrivialConstructor()) {
if (CXXConstructorDecl *BaseCtor =
BaseClassDecl->getDefaultConstructor(Context))
MarkDeclarationReferenced(CurrentLocation, BaseCtor);
else {
Diag(CurrentLocation, diag::err_defining_default_ctor)
<< Context.getTagDeclType(ClassDecl) << 1
<< Context.getTagDeclType(BaseClassDecl);
Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl)
<< Context.getTagDeclType(BaseClassDecl);
err = true;
}
}
}
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->hasTrivialConstructor()) {
if (CXXConstructorDecl *FieldCtor =
FieldClassDecl->getDefaultConstructor(Context))
MarkDeclarationReferenced(CurrentLocation, FieldCtor);
else {
Diag(CurrentLocation, diag::err_defining_default_ctor)
<< Context.getTagDeclType(ClassDecl) << 0 <<
Context.getTagDeclType(FieldClassDecl);
Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl)
<< Context.getTagDeclType(FieldClassDecl);
err = true;
}
}
} else if (FieldType->isReferenceType()) {
Diag(CurrentLocation, diag::err_unintialized_member)
<< Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
Diag((*Field)->getLocation(), diag::note_declared_at);
err = true;
} else if (FieldType.isConstQualified()) {
Diag(CurrentLocation, diag::err_unintialized_member)
<< Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
Diag((*Field)->getLocation(), diag::note_declared_at);
err = true;
}
}
if (!err)
Constructor->setUsed();
else
Constructor->setInvalidDecl();
}
void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
CXXDestructorDecl *Destructor) {
assert((Destructor->isImplicit() && !Destructor->isUsed()) &&
"DefineImplicitDestructor - call it for implicit default dtor");
CXXRecordDecl *ClassDecl
= cast<CXXRecordDecl>(Destructor->getDeclContext());
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");
}
}
}
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(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(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(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&).
if (ParmDecl->getType().isConstQualified())
RHSType.addConst();
if (ParmDecl->getType().isVolatileQualified())
RHSType.addVolatile();
ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl,
LHSType,
SourceLocation()));
ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl,
RHSType,
SourceLocation()));
Expr *Args[2] = { &*LHS, &*RHS };
OverloadCandidateSet CandidateSet;
AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2,
CandidateSet);
OverloadCandidateSet::iterator Best;
if (BestViableFunction(CandidateSet,
ClassDecl->getLocation(), 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();
}
/// BuildCXXConstructExpr - Creates a complete call to a constructor,
/// including handling of its default argument expressions.
Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType,
CXXConstructorDecl *Constructor,
bool Elidable,
Expr **Exprs, unsigned NumExprs) {
CXXConstructExpr *Temp = CXXConstructExpr::Create(Context, DeclInitType,
Constructor,
Elidable, Exprs, NumExprs);
// default arguments must be added to constructor call expression.
FunctionDecl *FDecl = cast<FunctionDecl>(Constructor);
unsigned NumArgsInProto = FDecl->param_size();
for (unsigned j = NumExprs; j != NumArgsInProto; j++) {
Expr *DefaultExpr = FDecl->getParamDecl(j)->getDefaultArg();
// If the default expression creates temporaries, we need to
// push them to the current stack of expression temporaries so they'll
// be properly destroyed.
if (CXXExprWithTemporaries *E
= dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) {
assert(!E->shouldDestroyTemporaries() &&
"Can't destroy temporaries in a default argument expr!");
for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I)
ExprTemporaries.push_back(E->getTemporary(I));
}
Expr *Arg = CXXDefaultArgExpr::Create(Context, FDecl->getParamDecl(j));
Temp->setArg(j, Arg);
}
return Temp;
}
void Sema::InitializeVarWithConstructor(VarDecl *VD,
CXXConstructorDecl *Constructor,
QualType DeclInitType,
Expr **Exprs, unsigned NumExprs) {
Expr *Temp = BuildCXXConstructExpr(DeclInitType, Constructor,
false, Exprs, NumExprs);
MarkDeclarationReferenced(VD->getLocation(), Constructor);
Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true);
VD->setInit(Context, Temp);
}
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;
}
// FIXME: Need to handle dependent types and expressions here.
// We will treat direct-initialization as a copy-initialization:
// int x(1); -as-> int x = 1;
// ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
//
// Clients that want to distinguish between the two forms, can check for
// direct initializer using VarDecl::hasCXXDirectInitializer().
// A major benefit is that clients that don't particularly care about which
// exactly form was it (like the CodeGen) can handle both cases without
// special case code.
// C++ 8.5p11:
// The form of initialization (using parentheses or '=') is generally
// insignificant, but does matter when the entity being initialized has a
// class type.
QualType DeclInitType = VDecl->getType();
if (const ArrayType *Array = Context.getAsArrayType(DeclInitType))
DeclInitType = Array->getElementType();
// 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()) {
CXXConstructorDecl *Constructor
= PerformInitializationByConstructor(DeclInitType,
(Expr **)Exprs.get(), NumExprs,
VDecl->getLocation(),
SourceRange(VDecl->getLocation(),
RParenLoc),
VDecl->getDeclName(),
IK_Direct);
if (!Constructor)
RealDecl->setInvalidDecl();
else {
VDecl->setCXXDirectInitializer(true);
InitializeVarWithConstructor(VDecl, Constructor, DeclInitType,
(Expr**)Exprs.release(), NumExprs);
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);
}
/// PerformInitializationByConstructor - Perform initialization by
/// constructor (C++ [dcl.init]p14), which may occur as part of
/// direct-initialization or copy-initialization. We are initializing
/// an object of type @p ClassType with the given arguments @p
/// Args. @p Loc is the location in the source code where the
/// initializer occurs (e.g., a declaration, member initializer,
/// functional cast, etc.) while @p Range covers the whole
/// initialization. @p InitEntity is the entity being initialized,
/// which may by the name of a declaration or a type. @p Kind is the
/// kind of initialization we're performing, which affects whether
/// explicit constructors will be considered. When successful, returns
/// the constructor that will be used to perform the initialization;
/// when the initialization fails, emits a diagnostic and returns
/// null.
CXXConstructorDecl *
Sema::PerformInitializationByConstructor(QualType ClassType,
Expr **Args, unsigned NumArgs,
SourceLocation Loc, SourceRange Range,
DeclarationName InitEntity,
InitializationKind Kind) {
const RecordType *ClassRec = ClassType->getAs<RecordType>();
assert(ClassRec && "Can only initialize a class type here");
// C++ [dcl.init]p14:
//
// If the initialization is direct-initialization, or if it is
// copy-initialization where the cv-unqualified version of the
// source type is the same class as, or a derived class of, the
// class of the destination, constructors are considered. The
// applicable constructors are enumerated (13.3.1.3), and the
// best one is chosen through overload resolution (13.3). The
// constructor so selected is called to initialize the object,
// with the initializer expression(s) as its argument(s). If no
// constructor applies, or the overload resolution is ambiguous,
// the initialization is ill-formed.
const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl());
OverloadCandidateSet CandidateSet;
// Add constructors to the overload set.
DeclarationName ConstructorName
= Context.DeclarationNames.getCXXConstructorName(
Context.getCanonicalType(ClassType.getUnqualifiedType()));
DeclContext::lookup_const_iterator Con, ConEnd;
for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName);
Con != ConEnd; ++Con) {
CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con);
if ((Kind == IK_Direct) ||
(Kind == IK_Copy && Constructor->isConvertingConstructor()) ||
(Kind == IK_Default && Constructor->isDefaultConstructor()))
AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet);
}
// FIXME: When we decide not to synthesize the implicitly-declared
// constructors, we'll need to make them appear here.
OverloadCandidateSet::iterator Best;
switch (BestViableFunction(CandidateSet, Loc, Best)) {
case OR_Success:
// We found a constructor. Return it.
return cast<CXXConstructorDecl>(Best->Function);
case OR_No_Viable_Function:
if (InitEntity)
Diag(Loc, diag::err_ovl_no_viable_function_in_init)
<< InitEntity << Range;
else
Diag(Loc, diag::err_ovl_no_viable_function_in_init)
<< ClassType << Range;
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
return 0;
case OR_Ambiguous:
if (InitEntity)
Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range;
else
Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range;
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
return 0;
case OR_Deleted:
if (InitEntity)
Diag(Loc, diag::err_ovl_deleted_init)
<< Best->Function->isDeleted()
<< InitEntity << Range;
else
Diag(Loc, diag::err_ovl_deleted_init)
<< Best->Function->isDeleted()
<< InitEntity << Range;
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
return 0;
}
return 0;
}
/// CompareReferenceRelationship - Compare the two types T1 and T2 to
/// determine whether they are reference-related,
/// reference-compatible, reference-compatible with added
/// qualification, or incompatible, for use in C++ initialization by
/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference
/// type, and the first type (T1) is the pointee type of the reference
/// type being initialized.
Sema::ReferenceCompareResult
Sema::CompareReferenceRelationship(QualType T1, QualType T2,
bool& DerivedToBase) {
assert(!T1->isReferenceType() &&
"T1 must be the pointee type of the reference type");
assert(!T2->isReferenceType() && "T2 cannot be a reference type");
T1 = Context.getCanonicalType(T1);
T2 = Context.getCanonicalType(T2);
QualType UnqualT1 = T1.getUnqualifiedType();
QualType UnqualT2 = T2.getUnqualifiedType();
// C++ [dcl.init.ref]p4:
// Given types "cv1 T1" and "cv2 T2," "cv1 T1" is
// reference-related to "cv2 T2" if T1 is the same type as T2, or
// T1 is a base class of T2.
if (UnqualT1 == UnqualT2)
DerivedToBase = false;
else if (IsDerivedFrom(UnqualT2, UnqualT1))
DerivedToBase = true;
else
return Ref_Incompatible;
// At this point, we know that T1 and T2 are reference-related (at
// least).
// C++ [dcl.init.ref]p4:
// "cv1 T1" is reference-compatible with "cv2 T2" if T1 is
// reference-related to T2 and cv1 is the same cv-qualification
// as, or greater cv-qualification than, cv2. For purposes of
// overload resolution, cases for which cv1 is greater
// cv-qualification than cv2 are identified as
// reference-compatible with added qualification (see 13.3.3.2).
if (T1.getCVRQualifiers() == T2.getCVRQualifiers())
return Ref_Compatible;
else if (T1.isMoreQualifiedThan(T2))
return Ref_Compatible_With_Added_Qualification;
else
return Ref_Related;
}
/// CheckReferenceInit - Check the initialization of a reference
/// variable with the given initializer (C++ [dcl.init.ref]). Init is
/// the initializer (either a simple initializer or an initializer
/// list), and DeclType is the type of the declaration. When ICS is
/// non-null, this routine will compute the implicit conversion
/// sequence according to C++ [over.ics.ref] and will not produce any
/// diagnostics; when ICS is null, it will emit diagnostics when any
/// errors are found. Either way, a return value of true indicates
/// that there was a failure, a return value of false indicates that
/// the reference initialization succeeded.
///
/// When @p SuppressUserConversions, user-defined conversions are
/// suppressed.
/// When @p AllowExplicit, we also permit explicit user-defined
/// conversion functions.
/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue.
bool
Sema::CheckReferenceInit(Expr *&Init, QualType DeclType,
ImplicitConversionSequence *ICS,
bool SuppressUserConversions,
bool AllowExplicit, bool ForceRValue) {
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, Init->getSourceRange().getBegin()))
return true;
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(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(Init->getSourceRange().getBegin(), 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.
// FIXME: Binding to a subobject of the lvalue is going to require more
// AST annotation than this.
ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*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()) {
// FIXME: Look for conversions in base classes!
CXXRecordDecl *T2RecordDecl
= dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl());
OverloadCandidateSet CandidateSet;
OverloadedFunctionDecl *Conversions
= T2RecordDecl->getConversionFunctions();
for (OverloadedFunctionDecl::function_iterator Func
= Conversions->function_begin();
Func != Conversions->function_end(); ++Func) {
CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func);
// If the conversion function doesn't return a reference type,
// it can't be considered for this conversion.
if (Conv->getConversionType()->isLValueReferenceType() &&
(AllowExplicit || !Conv->isExplicit()))
AddConversionCandidate(Conv, Init, DeclType, CandidateSet);
}
OverloadCandidateSet::iterator Best;
switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) {
case OR_Success:
// This is a direct binding.
BindsDirectly = true;
if (ICS) {
// C++ [over.ics.ref]p1:
//
// [...] If the parameter binds directly to the result of
// applying a conversion function to the argument
// expression, the implicit conversion sequence is a
// user-defined conversion sequence (13.3.3.1.2), with the
// second standard conversion sequence either an identity
// conversion or, if the conversion function returns an
// entity of a type that is a derived class of the parameter
// type, a derived-to-base Conversion.
ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion;
ICS->UserDefined.Before = Best->Conversions[0].Standard;
ICS->UserDefined.After = Best->FinalConversion;
ICS->UserDefined.ConversionFunction = Best->Function;
assert(ICS->UserDefined.After.ReferenceBinding &&
ICS->UserDefined.After.DirectBinding &&
"Expected a direct reference binding!");
return false;
} else {
// Perform the conversion.
// FIXME: Binding to a subobject of the lvalue is going to require more
// AST annotation than this.
ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true);
}
break;
case OR_Ambiguous:
assert(false && "Ambiguous reference binding conversions not implemented.");
return true;
case OR_No_Viable_Function:
case OR_Deleted:
// There was no suitable conversion, or we found a deleted
// conversion; continue with other checks.
break;
}
}
if (BindsDirectly) {
// C++ [dcl.init.ref]p4:
// [...] In all cases where the reference-related or
// reference-compatible relationship of two types is used to
// establish the validity of a reference binding, and T1 is a
// base class of T2, a program that necessitates such a binding
// is ill-formed if T1 is an inaccessible (clause 11) or
// ambiguous (10.2) base class of T2.
//
// Note that we only check this condition when we're allowed to
// complain about errors, because we should not be checking for
// ambiguity (or inaccessibility) unless the reference binding
// actually happens.
if (DerivedToBase)
return CheckDerivedToBaseConversion(T2, T1,
Init->getSourceRange().getBegin(),
Init->getSourceRange());
else
return false;
}
// -- Otherwise, the reference shall be to a non-volatile const
// type (i.e., cv1 shall be const), or the reference shall be an
// rvalue reference and the initializer expression shall be an rvalue.
if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) {
if (!ICS)
Diag(Init->getSourceRange().getBegin(),
diag::err_not_reference_to_const_init)
<< T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value")
<< T2 << Init->getSourceRange();
return true;
}
// -- If the initializer expression is an rvalue, with T2 a
// class type, and "cv1 T1" is reference-compatible with
// "cv2 T2," the reference is bound in one of the
// following ways (the choice is implementation-defined):
//
// -- The reference is bound to the object represented by
// the rvalue (see 3.10) or to a sub-object within that
// object.
//
// -- A temporary of type "cv1 T2" [sic] is created, and
// a constructor is called to copy the entire rvalue
// object into the temporary. The reference is bound to
// the temporary or to a sub-object within the
// temporary.
//
// The constructor that would be used to make the copy
// shall be callable whether or not the copy is actually
// done.
//
// Note that C++0x [dcl.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 {
// FIXME: Binding to a subobject of the rvalue is going to require more
// AST annotation than this.
ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*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(Init->getSourceRange().getBegin(),
diag::err_reference_init_drops_quals)
<< T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value")
<< T2 << Init->getSourceRange();
return true;
}
// If at least one of the types is a class type, the types are not
// related, and we aren't allowed any user conversions, the
// reference binding fails. This case is important for breaking
// recursion, since TryImplicitConversion below will attempt to
// create a temporary through the use of a copy constructor.
if (SuppressUserConversions && RefRelationship == Ref_Incompatible &&
(T1->isRecordType() || T2->isRecordType())) {
if (!ICS)
Diag(Init->getSourceRange().getBegin(),
diag::err_typecheck_convert_incompatible)
<< DeclType << Init->getType() << "initializing" << Init->getSourceRange();
return true;
}
// Actually try to convert the initializer to T1.
if (ICS) {
// C++ [over.ics.ref]p2:
//
// When a parameter of reference type is not bound directly to
// an argument expression, the conversion sequence is the one
// required to convert the argument expression to the
// underlying type of the reference according to
// 13.3.3.1. Conceptually, this conversion sequence corresponds
// to copy-initializing a temporary of the underlying type with
// the argument expression. Any difference in top-level
// cv-qualification is subsumed by the initialization itself
// and does not constitute a conversion.
*ICS = TryImplicitConversion(Init, T1, SuppressUserConversions);
// 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 {
return PerformImplicitConversion(Init, T1, "initializing");
}
}
/// CheckOverloadedOperatorDeclaration - Check whether the declaration
/// of this overloaded operator is well-formed. If so, returns false;
/// otherwise, emits appropriate diagnostics and returns true.
bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
assert(FnDecl && FnDecl->isOverloadedOperator() &&
"Expected an overloaded operator declaration");
OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
// C++ [over.oper]p5:
// The allocation and deallocation functions, operator new,
// operator new[], operator delete and operator delete[], are
// described completely in 3.7.3. The attributes and restrictions
// found in the rest of this subclause do not apply to them unless
// explicitly stated in 3.7.3.
// FIXME: Write a separate routine for checking this. For now, just allow it.
if (Op == OO_New || Op == OO_Array_New ||
Op == OO_Delete || Op == OO_Array_Delete)
return false;
// C++ [over.oper]p6:
// An operator function shall either be a non-static member
// function or be a non-member function and have at least one
// parameter whose type is a class, a reference to a class, an
// enumeration, or a reference to an enumeration.
if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
if (MethodDecl->isStatic())
return Diag(FnDecl->getLocation(),
diag::err_operator_overload_static) << FnDecl->getDeclName();
} else {
bool ClassOrEnumParam = false;
for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
ParamEnd = FnDecl->param_end();
Param != ParamEnd; ++Param) {
QualType ParamType = (*Param)->getType().getNonReferenceType();
if (ParamType->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)->hasUnparsedDefaultArg())
return Diag((*Param)->getLocation(),
diag::err_operator_overload_default_arg)
<< FnDecl->getDeclName();
else if (Expr *DefArg = (*Param)->getDefaultArg())
return Diag((*Param)->getLocation(),
diag::err_operator_overload_default_arg)
<< FnDecl->getDeclName() << DefArg->getSourceRange();
}
}
static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
{ false, false, false }
#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
, { Unary, Binary, MemberOnly }
#include "clang/Basic/OperatorKinds.def"
};
bool CanBeUnaryOperator = OperatorUses[Op][0];
bool CanBeBinaryOperator = OperatorUses[Op][1];
bool MustBeMemberOperator = OperatorUses[Op][2];
// C++ [over.oper]p8:
// [...] Operator functions cannot have more or fewer parameters
// than the number required for the corresponding operator, as
// described in the rest of this subclause.
unsigned NumParams = FnDecl->getNumParams()
+ (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
if (Op != OO_Call &&
((NumParams == 1 && !CanBeUnaryOperator) ||
(NumParams == 2 && !CanBeBinaryOperator) ||
(NumParams < 1) || (NumParams > 2))) {
// We have the wrong number of parameters.
unsigned ErrorKind;
if (CanBeUnaryOperator && CanBeBinaryOperator) {
ErrorKind = 2; // 2 -> unary or binary.
} else if (CanBeUnaryOperator) {
ErrorKind = 0; // 0 -> unary
} else {
assert(CanBeBinaryOperator &&
"All non-call overloaded operators are unary or binary!");
ErrorKind = 1; // 1 -> binary
}
return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
<< FnDecl->getDeclName() << NumParams << ErrorKind;
}
// Overloaded operators other than operator() cannot be variadic.
if (Op != OO_Call &&
FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) {
return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
<< FnDecl->getDeclName();
}
// Some operators must be non-static member functions.
if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
return Diag(FnDecl->getLocation(),
diag::err_operator_overload_must_be_member)
<< FnDecl->getDeclName();
}
// C++ [over.inc]p1:
// The user-defined function called operator++ implements the
// prefix and postfix ++ operator. If this function is a member
// function with no parameters, or a non-member function with one
// parameter of class or enumeration type, it defines the prefix
// increment operator ++ for objects of that type. If the function
// is a member function with one parameter (which shall be of type
// int) or a non-member function with two parameters (the second
// of which shall be of type int), it defines the postfix
// increment operator ++ for objects of that type.
if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
bool ParamIsInt = false;
if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType())
ParamIsInt = BT->getKind() == BuiltinType::Int;
if (!ParamIsInt)
return Diag(LastParam->getLocation(),
diag::err_operator_overload_post_incdec_must_be_int)
<< LastParam->getType() << (Op == OO_MinusMinus);
}
// Notify the class if it got an assignment operator.
if (Op == OO_Equal) {
// Would have returned earlier otherwise.
assert(isa<CXXMethodDecl>(FnDecl) &&
"Overloaded = not member, but not filtered.");
CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl);
Method->setCopyAssignment(true);
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,
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, VarDecl::None,
Range.getBegin());
if (Invalid)
ExDecl->setInvalidDecl();
return ExDecl;
}
/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
/// handler.
Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
QualType ExDeclType = GetTypeForDeclarator(D, S);
bool Invalid = D.isInvalidType();
IdentifierInfo *II = D.getIdentifier();
if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) {
// The scope should be freshly made just for us. There is just no way
// it contains any previous declaration.
assert(!S->isDeclScope(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,
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) {
std::string str(AssertMessage->getStrData(),
AssertMessage->getByteLength());
Diag(AssertLoc, diag::err_static_assert_failed)
<< str << AssertExpr->getSourceRange();
}
}
assertexpr.release();
assertmessageexpr.release();
Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc,
AssertExpr, AssertMessage);
CurContext->addDecl(Decl);
return DeclPtrTy::make(Decl);
}
Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S,
llvm::PointerUnion<const DeclSpec*,Declarator*> DU,
bool IsDefinition) {
Declarator *D = DU.dyn_cast<Declarator*>();
const DeclSpec &DS = (D ? D->getDeclSpec() : *DU.get<const DeclSpec*>());
assert(DS.isFriendSpecified());
assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
// If there's no declarator, then this can only be a friend class
// declaration (or else it's just syntactically invalid).
if (!D) {
SourceLocation Loc = DS.getSourceRange().getBegin();
QualType T;
DeclContext *DC;
// In C++0x, we just accept any old type.
if (getLangOptions().CPlusPlus0x) {
bool invalid = false;
QualType T = ConvertDeclSpecToType(DS, Loc, invalid);
if (invalid)
return DeclPtrTy();
// The semantic context in which to create the decl. If it's not
// a record decl (or we don't yet know if it is), create it in the
// current context.
DC = CurContext;
if (const RecordType *RT = T->getAs<RecordType>())
DC = RT->getDecl()->getDeclContext();
// The C++98 rules are somewhat more complex.
} else {
// 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.
CXXRecordDecl *RD = 0;
switch (DS.getTypeSpecType()) {
case DeclSpec::TST_class:
case DeclSpec::TST_struct:
case DeclSpec::TST_union:
RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep());
if (!RD) return DeclPtrTy();
break;
case DeclSpec::TST_typename:
if (const RecordType *RT =
((const Type*) DS.getTypeRep())->getAs<RecordType>())
RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
// fallthrough
default:
if (RD) {
Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type)
<< (RD->isUnion())
<< CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(),
RD->isUnion() ? " union" : " class");
return DeclPtrTy::make(RD);
}
Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend)
<< DS.getSourceRange();
return DeclPtrTy();
}
// The record declaration we get from friend declarations is not
// canonicalized; see ActOnTag.
assert(RD);
// C++ [class.friend]p2: A class shall not be defined inside
// a friend declaration.
if (RD->isDefinition())
Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class)
<< RD->getSourceRange();
// 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.
//
// Also, definitions currently get treated in a way that causes
// this error, so only report it if we didn't see a definition.
else if (RD->getDeclContext() == CurContext &&
!getLangOptions().CPlusPlus0x)
Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class);
T = QualType(RD->getTypeForDecl(), 0);
DC = RD->getDeclContext();
}
FriendClassDecl *FCD = FriendClassDecl::Create(Context, DC, Loc, T,
DS.getFriendSpecLoc());
FCD->setLexicalDeclContext(CurContext);
if (CurContext->isDependentContext())
CurContext->addHiddenDecl(FCD);
else
CurContext->addDecl(FCD);
return DeclPtrTy::make(FCD);
}
// We have a declarator.
assert(D);
SourceLocation Loc = D->getIdentifierLoc();
QualType T = GetTypeForDeclarator(*D, S);
// C++ [class.friend]p1
// A friend of a class is a function or class....
// Note that this sees through typedefs, which is intended.
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 existing declaration we found.
FunctionDecl *FD = NULL;
// 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.
if (!ScopeQual.isInvalid() && ScopeQual.isSet()) {
DC = computeDeclContext(ScopeQual);
// FIXME: handle dependent contexts
if (!DC) return DeclPtrTy();
Decl *Dec = LookupQualifiedNameWithType(DC, Name, T);
// 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...
if (!Dec || Dec->getDeclContext() != 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 == CurContext)
Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member);
FD = cast<FunctionDecl>(Dec);
// 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();
Decl *Dec = LookupQualifiedNameWithType(DC, Name, T);
// TODO: decide what we think about using declarations.
if (Dec) {
FD = cast<FunctionDecl>(Dec);
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 (FD && DC == CurContext && !getLangOptions().CPlusPlus0x)
Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member);
}
bool Redeclaration = (FD != 0);
// If we found a match, create a friend function declaration with
// that function as the previous declaration.
if (Redeclaration) {
// Create it in the semantic context of the original declaration.
DC = FD->getDeclContext();
// If we didn't find something matching the type exactly, create
// a declaration. This declaration should only be findable via
// argument-dependent lookup.
} else {
assert(DC->isFileContext());
// This implies that it has to be an operator or function.
if (D->getKind() == Declarator::DK_Constructor ||
D->getKind() == Declarator::DK_Destructor ||
D->getKind() == Declarator::DK_Conversion) {
Diag(Loc, diag::err_introducing_special_friend) <<
(D->getKind() == Declarator::DK_Constructor ? 0 :
D->getKind() == Declarator::DK_Destructor ? 1 : 2);
return DeclPtrTy();
}
}
NamedDecl *ND = ActOnFunctionDeclarator(S, *D, DC, T,
/* PrevDecl = */ FD,
MultiTemplateParamsArg(*this),
IsDefinition,
Redeclaration);
FD = cast_or_null<FriendFunctionDecl>(ND);
// If this is a dependent context, just add the decl to the
// class's decl list and don't both with the lookup tables. This
// doesn't affect lookup because any call that might find this
// function via ADL necessarily has to involve dependently-typed
// arguments and hence can't be resolved until
// template-instantiation anyway.
if (CurContext->isDependentContext())
CurContext->addHiddenDecl(FD);
else
CurContext->addDecl(FD);
return DeclPtrTy::make(FD);
}
void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) {
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()->getAsFunctionType()->getResultType();
QualType OldTy = Old->getType()->getAsFunctionType()->getResultType();
QualType CNewTy = Context.getCanonicalType(NewTy);
QualType COldTy = Context.getCanonicalType(OldTy);
if (CNewTy == COldTy &&
CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers())
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 (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) {
// 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.getCVRQualifiers() != COldTy.getCVRQualifiers()) {
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::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New,
const CXXMethodDecl *Old)
{
return CheckExceptionSpecSubset(diag::err_override_exception_spec,
diag::note_overridden_virtual_function,
Old->getType()->getAsFunctionProtoType(),
Old->getLocation(),
New->getType()->getAsFunctionProtoType(),
New->getLocation());
}
/// 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) {
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) {
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);
}
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