Gitiles
Code Review Sign In
gerrit-public.fairphone.software / fp2-dev / platform / external / clang / c8be365b65912ebba182c39ccee4fc5c2fc7572c / . / lib / Sema / SemaDeclCXX.cpp
blob: ded89b453c9ded4140391a3d0c7920e353e96355 [file] [log] [blame]
//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements semantic analysis for C++ declarations.
//
//===----------------------------------------------------------------------===//
#include "Sema.h"
#include "SemaInit.h"
#include "Lookup.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/AST/TypeLoc.h"
#include "clang/AST/TypeOrdering.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Parse/DeclSpec.h"
#include "clang/Parse/Template.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/STLExtras.h"
#include <map>
#include <set>
using namespace clang;
//===----------------------------------------------------------------------===//
// CheckDefaultArgumentVisitor
//===----------------------------------------------------------------------===//
namespace {
/// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses
/// the default argument of a parameter to determine whether it
/// contains any ill-formed subexpressions. For example, this will
/// diagnose the use of local variables or parameters within the
/// default argument expression.
class CheckDefaultArgumentVisitor
: public StmtVisitor<CheckDefaultArgumentVisitor, bool> {
Expr *DefaultArg;
Sema *S;
public:
CheckDefaultArgumentVisitor(Expr *defarg, Sema *s)
: DefaultArg(defarg), S(s) {}
bool VisitExpr(Expr *Node);
bool VisitDeclRefExpr(DeclRefExpr *DRE);
bool VisitCXXThisExpr(CXXThisExpr *ThisE);
};
/// VisitExpr - Visit all of the children of this expression.
bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) {
bool IsInvalid = false;
for (Stmt::child_iterator I = Node->child_begin(),
E = Node->child_end(); I != E; ++I)
IsInvalid |= Visit(*I);
return IsInvalid;
}
/// VisitDeclRefExpr - Visit a reference to a declaration, to
/// determine whether this declaration can be used in the default
/// argument expression.
bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) {
NamedDecl *Decl = DRE->getDecl();
if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) {
// C++ [dcl.fct.default]p9
// Default arguments are evaluated each time the function is
// called. The order of evaluation of function arguments is
// unspecified. Consequently, parameters of a function shall not
// be used in default argument expressions, even if they are not
// evaluated. Parameters of a function declared before a default
// argument expression are in scope and can hide namespace and
// class member names.
return S->Diag(DRE->getSourceRange().getBegin(),
diag::err_param_default_argument_references_param)
<< Param->getDeclName() << DefaultArg->getSourceRange();
} else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) {
// C++ [dcl.fct.default]p7
// Local variables shall not be used in default argument
// expressions.
if (VDecl->isBlockVarDecl())
return S->Diag(DRE->getSourceRange().getBegin(),
diag::err_param_default_argument_references_local)
<< VDecl->getDeclName() << DefaultArg->getSourceRange();
}
return false;
}
/// VisitCXXThisExpr - Visit a C++ "this" expression.
bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) {
// C++ [dcl.fct.default]p8:
// The keyword this shall not be used in a default argument of a
// member function.
return S->Diag(ThisE->getSourceRange().getBegin(),
diag::err_param_default_argument_references_this)
<< ThisE->getSourceRange();
}
}
bool
Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg,
SourceLocation EqualLoc) {
QualType ParamType = Param->getType();
if (RequireCompleteType(Param->getLocation(), Param->getType(),
diag::err_typecheck_decl_incomplete_type)) {
Param->setInvalidDecl();
return true;
}
Expr *Arg = (Expr *)DefaultArg.get();
// C++ [dcl.fct.default]p5
// A default argument expression is implicitly converted (clause
// 4) to the parameter type. The default argument expression has
// the same semantic constraints as the initializer expression in
// a declaration of a variable of the parameter type, using the
// copy-initialization semantics (8.5).
InitializedEntity Entity = InitializedEntity::InitializeParameter(Param);
InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(),
EqualLoc);
InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1);
OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind,
MultiExprArg(*this, (void**)&Arg, 1));
if (Result.isInvalid())
return true;
Arg = Result.takeAs<Expr>();
Arg = MaybeCreateCXXExprWithTemporaries(Arg);
// Okay: add the default argument to the parameter
Param->setDefaultArg(Arg);
DefaultArg.release();
return false;
}
/// ActOnParamDefaultArgument - Check whether the default argument
/// provided for a function parameter is well-formed. If so, attach it
/// to the parameter declaration.
void
Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc,
ExprArg defarg) {
if (!param || !defarg.get())
return;
ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
UnparsedDefaultArgLocs.erase(Param);
ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>());
QualType ParamType = Param->getType();
// Default arguments are only permitted in C++
if (!getLangOptions().CPlusPlus) {
Diag(EqualLoc, diag::err_param_default_argument)
<< DefaultArg->getSourceRange();
Param->setInvalidDecl();
return;
}
// Check that the default argument is well-formed
CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this);
if (DefaultArgChecker.Visit(DefaultArg.get())) {
Param->setInvalidDecl();
return;
}
SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc);
}
/// ActOnParamUnparsedDefaultArgument - We've seen a default
/// argument for a function parameter, but we can't parse it yet
/// because we're inside a class definition. Note that this default
/// argument will be parsed later.
void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param,
SourceLocation EqualLoc,
SourceLocation ArgLoc) {
if (!param)
return;
ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
if (Param)
Param->setUnparsedDefaultArg();
UnparsedDefaultArgLocs[Param] = ArgLoc;
}
/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of
/// the default argument for the parameter param failed.
void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) {
if (!param)
return;
ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>());
Param->setInvalidDecl();
UnparsedDefaultArgLocs.erase(Param);
}
/// CheckExtraCXXDefaultArguments - Check for any extra default
/// arguments in the declarator, which is not a function declaration
/// or definition and therefore is not permitted to have default
/// arguments. This routine should be invoked for every declarator
/// that is not a function declaration or definition.
void Sema::CheckExtraCXXDefaultArguments(Declarator &D) {
// C++ [dcl.fct.default]p3
// A default argument expression shall be specified only in the
// parameter-declaration-clause of a function declaration or in a
// template-parameter (14.1). It shall not be specified for a
// parameter pack. If it is specified in a
// parameter-declaration-clause, it shall not occur within a
// declarator or abstract-declarator of a parameter-declaration.
for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
DeclaratorChunk &chunk = D.getTypeObject(i);
if (chunk.Kind == DeclaratorChunk::Function) {
for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) {
ParmVarDecl *Param =
cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>());
if (Param->hasUnparsedDefaultArg()) {
CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens;
Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
<< SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation());
delete Toks;
chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0;
} else if (Param->getDefaultArg()) {
Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc)
<< Param->getDefaultArg()->getSourceRange();
Param->setDefaultArg(0);
}
}
}
}
}
// MergeCXXFunctionDecl - Merge two declarations of the same C++
// function, once we already know that they have the same
// type. Subroutine of MergeFunctionDecl. Returns true if there was an
// error, false otherwise.
bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) {
bool Invalid = false;
// C++ [dcl.fct.default]p4:
// For non-template functions, default arguments can be added in
// later declarations of a function in the same
// scope. Declarations in different scopes have completely
// distinct sets of default arguments. That is, declarations in
// inner scopes do not acquire default arguments from
// declarations in outer scopes, and vice versa. In a given
// function declaration, all parameters subsequent to a
// parameter with a default argument shall have default
// arguments supplied in this or previous declarations. A
// default argument shall not be redefined by a later
// declaration (not even to the same value).
//
// C++ [dcl.fct.default]p6:
// Except for member functions of class templates, the default arguments
// in a member function definition that appears outside of the class
// definition are added to the set of default arguments provided by the
// member function declaration in the class definition.
for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) {
ParmVarDecl *OldParam = Old->getParamDecl(p);
ParmVarDecl *NewParam = New->getParamDecl(p);
if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) {
// FIXME: If the parameter doesn't have an identifier then the location
// points to the '=' which means that the fixit hint won't remove any
// extra spaces between the type and the '='.
SourceLocation Begin = NewParam->getLocation();
if (NewParam->getIdentifier())
Begin = PP.getLocForEndOfToken(Begin);
Diag(NewParam->getLocation(),
diag::err_param_default_argument_redefinition)
<< NewParam->getDefaultArgRange()
<< CodeModificationHint::CreateRemoval(SourceRange(Begin,
NewParam->getLocEnd()));
// Look for the function declaration where the default argument was
// actually written, which may be a declaration prior to Old.
for (FunctionDecl *Older = Old->getPreviousDeclaration();
Older; Older = Older->getPreviousDeclaration()) {
if (!Older->getParamDecl(p)->hasDefaultArg())
break;
OldParam = Older->getParamDecl(p);
}
Diag(OldParam->getLocation(), diag::note_previous_definition)
<< OldParam->getDefaultArgRange();
Invalid = true;
} else if (OldParam->hasDefaultArg()) {
// Merge the old default argument into the new parameter
if (OldParam->hasUninstantiatedDefaultArg())
NewParam->setUninstantiatedDefaultArg(
OldParam->getUninstantiatedDefaultArg());
else
NewParam->setDefaultArg(OldParam->getDefaultArg());
} else if (NewParam->hasDefaultArg()) {
if (New->getDescribedFunctionTemplate()) {
// Paragraph 4, quoted above, only applies to non-template functions.
Diag(NewParam->getLocation(),
diag::err_param_default_argument_template_redecl)
<< NewParam->getDefaultArgRange();
Diag(Old->getLocation(), diag::note_template_prev_declaration)
<< false;
} else if (New->getTemplateSpecializationKind()
!= TSK_ImplicitInstantiation &&
New->getTemplateSpecializationKind() != TSK_Undeclared) {
// C++ [temp.expr.spec]p21:
// Default function arguments shall not be specified in a declaration
// or a definition for one of the following explicit specializations:
// - the explicit specialization of a function template;
// - the explicit specialization of a member function template;
// - the explicit specialization of a member function of a class
// template where the class template specialization to which the
// member function specialization belongs is implicitly
// instantiated.
Diag(NewParam->getLocation(), diag::err_template_spec_default_arg)
<< (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization)
<< New->getDeclName()
<< NewParam->getDefaultArgRange();
} else if (New->getDeclContext()->isDependentContext()) {
// C++ [dcl.fct.default]p6 (DR217):
// Default arguments for a member function of a class template shall
// be specified on the initial declaration of the member function
// within the class template.
//
// Reading the tea leaves a bit in DR217 and its reference to DR205
// leads me to the conclusion that one cannot add default function
// arguments for an out-of-line definition of a member function of a
// dependent type.
int WhichKind = 2;
if (CXXRecordDecl *Record
= dyn_cast<CXXRecordDecl>(New->getDeclContext())) {
if (Record->getDescribedClassTemplate())
WhichKind = 0;
else if (isa<ClassTemplatePartialSpecializationDecl>(Record))
WhichKind = 1;
else
WhichKind = 2;
}
Diag(NewParam->getLocation(),
diag::err_param_default_argument_member_template_redecl)
<< WhichKind
<< NewParam->getDefaultArgRange();
}
}
}
if (CheckEquivalentExceptionSpec(
Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(),
New->getType()->getAs<FunctionProtoType>(), New->getLocation()))
Invalid = true;
return Invalid;
}
/// CheckCXXDefaultArguments - Verify that the default arguments for a
/// function declaration are well-formed according to C++
/// [dcl.fct.default].
void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) {
unsigned NumParams = FD->getNumParams();
unsigned p;
// Find first parameter with a default argument
for (p = 0; p < NumParams; ++p) {
ParmVarDecl *Param = FD->getParamDecl(p);
if (Param->hasDefaultArg())
break;
}
// C++ [dcl.fct.default]p4:
// In a given function declaration, all parameters
// subsequent to a parameter with a default argument shall
// have default arguments supplied in this or previous
// declarations. A default argument shall not be redefined
// by a later declaration (not even to the same value).
unsigned LastMissingDefaultArg = 0;
for (; p < NumParams; ++p) {
ParmVarDecl *Param = FD->getParamDecl(p);
if (!Param->hasDefaultArg()) {
if (Param->isInvalidDecl())
/* We already complained about this parameter. */;
else if (Param->getIdentifier())
Diag(Param->getLocation(),
diag::err_param_default_argument_missing_name)
<< Param->getIdentifier();
else
Diag(Param->getLocation(),
diag::err_param_default_argument_missing);
LastMissingDefaultArg = p;
}
}
if (LastMissingDefaultArg > 0) {
// Some default arguments were missing. Clear out all of the
// default arguments up to (and including) the last missing
// default argument, so that we leave the function parameters
// in a semantically valid state.
for (p = 0; p <= LastMissingDefaultArg; ++p) {
ParmVarDecl *Param = FD->getParamDecl(p);
if (Param->hasDefaultArg()) {
if (!Param->hasUnparsedDefaultArg())
Param->getDefaultArg()->Destroy(Context);
Param->setDefaultArg(0);
}
}
}
}
/// isCurrentClassName - Determine whether the identifier II is the
/// name of the class type currently being defined. In the case of
/// nested classes, this will only return true if II is the name of
/// the innermost class.
bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *,
const CXXScopeSpec *SS) {
CXXRecordDecl *CurDecl;
if (SS && SS->isSet() && !SS->isInvalid()) {
DeclContext *DC = computeDeclContext(*SS, true);
CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC);
} else
CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext);
if (CurDecl)
return &II == CurDecl->getIdentifier();
else
return false;
}
/// \brief Check the validity of a C++ base class specifier.
///
/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics
/// and returns NULL otherwise.
CXXBaseSpecifier *
Sema::CheckBaseSpecifier(CXXRecordDecl *Class,
SourceRange SpecifierRange,
bool Virtual, AccessSpecifier Access,
QualType BaseType,
SourceLocation BaseLoc) {
// C++ [class.union]p1:
// A union shall not have base classes.
if (Class->isUnion()) {
Diag(Class->getLocation(), diag::err_base_clause_on_union)
<< SpecifierRange;
return 0;
}
if (BaseType->isDependentType())
return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
Class->getTagKind() == RecordDecl::TK_class,
Access, BaseType);
// Base specifiers must be record types.
if (!BaseType->isRecordType()) {
Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange;
return 0;
}
// C++ [class.union]p1:
// A union shall not be used as a base class.
if (BaseType->isUnionType()) {
Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange;
return 0;
}
// C++ [class.derived]p2:
// The class-name in a base-specifier shall not be an incompletely
// defined class.
if (RequireCompleteType(BaseLoc, BaseType,
PDiag(diag::err_incomplete_base_class)
<< SpecifierRange))
return 0;
// If the base class is polymorphic or isn't empty, the new one is/isn't, too.
RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl();
assert(BaseDecl && "Record type has no declaration");
BaseDecl = BaseDecl->getDefinition(Context);
assert(BaseDecl && "Base type is not incomplete, but has no definition");
CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl);
assert(CXXBaseDecl && "Base type is not a C++ type");
// C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases.
if (CXXBaseDecl->hasAttr<FinalAttr>()) {
Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString();
Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl)
<< BaseType;
return 0;
}
SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual);
// Create the base specifier.
// FIXME: Allocate via ASTContext?
return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual,
Class->getTagKind() == RecordDecl::TK_class,
Access, BaseType);
}
void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class,
const CXXRecordDecl *BaseClass,
bool BaseIsVirtual) {
// A class with a non-empty base class is not empty.
// FIXME: Standard ref?
if (!BaseClass->isEmpty())
Class->setEmpty(false);
// C++ [class.virtual]p1:
// A class that [...] inherits a virtual function is called a polymorphic
// class.
if (BaseClass->isPolymorphic())
Class->setPolymorphic(true);
// C++ [dcl.init.aggr]p1:
// An aggregate is [...] a class with [...] no base classes [...].
Class->setAggregate(false);
// C++ [class]p4:
// A POD-struct is an aggregate class...
Class->setPOD(false);
if (BaseIsVirtual) {
// C++ [class.ctor]p5:
// A constructor is trivial if its class has no virtual base classes.
Class->setHasTrivialConstructor(false);
// C++ [class.copy]p6:
// A copy constructor is trivial if its class has no virtual base classes.
Class->setHasTrivialCopyConstructor(false);
// C++ [class.copy]p11:
// A copy assignment operator is trivial if its class has no virtual
// base classes.
Class->setHasTrivialCopyAssignment(false);
// C++0x [meta.unary.prop] is_empty:
// T is a class type, but not a union type, with ... no virtual base
// classes
Class->setEmpty(false);
} else {
// C++ [class.ctor]p5:
// A constructor is trivial if all the direct base classes of its
// class have trivial constructors.
if (!BaseClass->hasTrivialConstructor())
Class->setHasTrivialConstructor(false);
// C++ [class.copy]p6:
// A copy constructor is trivial if all the direct base classes of its
// class have trivial copy constructors.
if (!BaseClass->hasTrivialCopyConstructor())
Class->setHasTrivialCopyConstructor(false);
// C++ [class.copy]p11:
// A copy assignment operator is trivial if all the direct base classes
// of its class have trivial copy assignment operators.
if (!BaseClass->hasTrivialCopyAssignment())
Class->setHasTrivialCopyAssignment(false);
}
// C++ [class.ctor]p3:
// A destructor is trivial if all the direct base classes of its class
// have trivial destructors.
if (!BaseClass->hasTrivialDestructor())
Class->setHasTrivialDestructor(false);
}
/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is
/// one entry in the base class list of a class specifier, for
/// example:
/// class foo : public bar, virtual private baz {
/// 'public bar' and 'virtual private baz' are each base-specifiers.
Sema::BaseResult
Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange,
bool Virtual, AccessSpecifier Access,
TypeTy *basetype, SourceLocation BaseLoc) {
if (!classdecl)
return true;
AdjustDeclIfTemplate(classdecl);
CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>());
QualType BaseType = GetTypeFromParser(basetype);
if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange,
Virtual, Access,
BaseType, BaseLoc))
return BaseSpec;
return true;
}
/// \brief Performs the actual work of attaching the given base class
/// specifiers to a C++ class.
bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
unsigned NumBases) {
if (NumBases == 0)
return false;
// Used to keep track of which base types we have already seen, so
// that we can properly diagnose redundant direct base types. Note
// that the key is always the unqualified canonical type of the base
// class.
std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes;
// Copy non-redundant base specifiers into permanent storage.
unsigned NumGoodBases = 0;
bool Invalid = false;
for (unsigned idx = 0; idx < NumBases; ++idx) {
QualType NewBaseType
= Context.getCanonicalType(Bases[idx]->getType());
NewBaseType = NewBaseType.getLocalUnqualifiedType();
if (KnownBaseTypes[NewBaseType]) {
// C++ [class.mi]p3:
// A class shall not be specified as a direct base class of a
// derived class more than once.
Diag(Bases[idx]->getSourceRange().getBegin(),
diag::err_duplicate_base_class)
<< KnownBaseTypes[NewBaseType]->getType()
<< Bases[idx]->getSourceRange();
// Delete the duplicate base class specifier; we're going to
// overwrite its pointer later.
Context.Deallocate(Bases[idx]);
Invalid = true;
} else {
// Okay, add this new base class.
KnownBaseTypes[NewBaseType] = Bases[idx];
Bases[NumGoodBases++] = Bases[idx];
}
}
// Attach the remaining base class specifiers to the derived class.
Class->setBases(Context, Bases, NumGoodBases);
// Delete the remaining (good) base class specifiers, since their
// data has been copied into the CXXRecordDecl.
for (unsigned idx = 0; idx < NumGoodBases; ++idx)
Context.Deallocate(Bases[idx]);
return Invalid;
}
/// ActOnBaseSpecifiers - Attach the given base specifiers to the
/// class, after checking whether there are any duplicate base
/// classes.
void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases,
unsigned NumBases) {
if (!ClassDecl || !Bases || !NumBases)
return;
AdjustDeclIfTemplate(ClassDecl);
AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()),
(CXXBaseSpecifier**)(Bases), NumBases);
}
/// \brief Determine whether the type \p Derived is a C++ class that is
/// derived from the type \p Base.
bool Sema::IsDerivedFrom(QualType Derived, QualType Base) {
if (!getLangOptions().CPlusPlus)
return false;
const RecordType *DerivedRT = Derived->getAs<RecordType>();
if (!DerivedRT)
return false;
const RecordType *BaseRT = Base->getAs<RecordType>();
if (!BaseRT)
return false;
CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl());
CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
return DerivedRD->isDerivedFrom(BaseRD);
}
/// \brief Determine whether the type \p Derived is a C++ class that is
/// derived from the type \p Base.
bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) {
if (!getLangOptions().CPlusPlus)
return false;
const RecordType *DerivedRT = Derived->getAs<RecordType>();
if (!DerivedRT)
return false;
const RecordType *BaseRT = Base->getAs<RecordType>();
if (!BaseRT)
return false;
CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl());
CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
return DerivedRD->isDerivedFrom(BaseRD, Paths);
}
/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base
/// conversion (where Derived and Base are class types) is
/// well-formed, meaning that the conversion is unambiguous (and
/// that all of the base classes are accessible). Returns true
/// and emits a diagnostic if the code is ill-formed, returns false
/// otherwise. Loc is the location where this routine should point to
/// if there is an error, and Range is the source range to highlight
/// if there is an error.
bool
Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
unsigned InaccessibleBaseID,
unsigned AmbigiousBaseConvID,
SourceLocation Loc, SourceRange Range,
DeclarationName Name) {
// First, determine whether the path from Derived to Base is
// ambiguous. This is slightly more expensive than checking whether
// the Derived to Base conversion exists, because here we need to
// explore multiple paths to determine if there is an ambiguity.
CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
/*DetectVirtual=*/false);
bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths);
assert(DerivationOkay &&
"Can only be used with a derived-to-base conversion");
(void)DerivationOkay;
if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) {
if (InaccessibleBaseID == 0)
return false;
// Check that the base class can be accessed.
return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc,
Name);
}
// We know that the derived-to-base conversion is ambiguous, and
// we're going to produce a diagnostic. Perform the derived-to-base
// search just one more time to compute all of the possible paths so
// that we can print them out. This is more expensive than any of
// the previous derived-to-base checks we've done, but at this point
// performance isn't as much of an issue.
Paths.clear();
Paths.setRecordingPaths(true);
bool StillOkay = IsDerivedFrom(Derived, Base, Paths);
assert(StillOkay && "Can only be used with a derived-to-base conversion");
(void)StillOkay;
// Build up a textual representation of the ambiguous paths, e.g.,
// D -> B -> A, that will be used to illustrate the ambiguous
// conversions in the diagnostic. We only print one of the paths
// to each base class subobject.
std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths);
Diag(Loc, AmbigiousBaseConvID)
<< Derived << Base << PathDisplayStr << Range << Name;
return true;
}
bool
Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base,
SourceLocation Loc, SourceRange Range,
bool IgnoreAccess) {
return CheckDerivedToBaseConversion(Derived, Base,
IgnoreAccess ? 0 :
diag::err_conv_to_inaccessible_base,
diag::err_ambiguous_derived_to_base_conv,
Loc, Range, DeclarationName());
}
/// @brief Builds a string representing ambiguous paths from a
/// specific derived class to different subobjects of the same base
/// class.
///
/// This function builds a string that can be used in error messages
/// to show the different paths that one can take through the
/// inheritance hierarchy to go from the derived class to different
/// subobjects of a base class. The result looks something like this:
/// @code
/// struct D -> struct B -> struct A
/// struct D -> struct C -> struct A
/// @endcode
std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) {
std::string PathDisplayStr;
std::set<unsigned> DisplayedPaths;
for (CXXBasePaths::paths_iterator Path = Paths.begin();
Path != Paths.end(); ++Path) {
if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) {
// We haven't displayed a path to this particular base
// class subobject yet.
PathDisplayStr += "\n ";
PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString();
for (CXXBasePath::const_iterator Element = Path->begin();
Element != Path->end(); ++Element)
PathDisplayStr += " -> " + Element->Base->getType().getAsString();
}
}
return PathDisplayStr;
}
//===----------------------------------------------------------------------===//
// C++ class member Handling
//===----------------------------------------------------------------------===//
/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member
/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the
/// bitfield width if there is one and 'InitExpr' specifies the initializer if
/// any.
Sema::DeclPtrTy
Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D,
MultiTemplateParamsArg TemplateParameterLists,
ExprTy *BW, ExprTy *InitExpr, bool IsDefinition,
bool Deleted) {
const DeclSpec &DS = D.getDeclSpec();
DeclarationName Name = GetNameForDeclarator(D);
Expr *BitWidth = static_cast<Expr*>(BW);
Expr *Init = static_cast<Expr*>(InitExpr);
SourceLocation Loc = D.getIdentifierLoc();
bool isFunc = D.isFunctionDeclarator();
assert(!DS.isFriendSpecified());
// C++ 9.2p6: A member shall not be declared to have automatic storage
// duration (auto, register) or with the extern storage-class-specifier.
// C++ 7.1.1p8: The mutable specifier can be applied only to names of class
// data members and cannot be applied to names declared const or static,
// and cannot be applied to reference members.
switch (DS.getStorageClassSpec()) {
case DeclSpec::SCS_unspecified:
case DeclSpec::SCS_typedef:
case DeclSpec::SCS_static:
// FALL THROUGH.
break;
case DeclSpec::SCS_mutable:
if (isFunc) {
if (DS.getStorageClassSpecLoc().isValid())
Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function);
else
Diag(DS.getThreadSpecLoc(), diag::err_mutable_function);
// FIXME: It would be nicer if the keyword was ignored only for this
// declarator. Otherwise we could get follow-up errors.
D.getMutableDeclSpec().ClearStorageClassSpecs();
} else {
QualType T = GetTypeForDeclarator(D, S);
diag::kind err = static_cast<diag::kind>(0);
if (T->isReferenceType())
err = diag::err_mutable_reference;
else if (T.isConstQualified())
err = diag::err_mutable_const;
if (err != 0) {
if (DS.getStorageClassSpecLoc().isValid())
Diag(DS.getStorageClassSpecLoc(), err);
else
Diag(DS.getThreadSpecLoc(), err);
// FIXME: It would be nicer if the keyword was ignored only for this
// declarator. Otherwise we could get follow-up errors.
D.getMutableDeclSpec().ClearStorageClassSpecs();
}
}
break;
default:
if (DS.getStorageClassSpecLoc().isValid())
Diag(DS.getStorageClassSpecLoc(),
diag::err_storageclass_invalid_for_member);
else
Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member);
D.getMutableDeclSpec().ClearStorageClassSpecs();
}
if (!isFunc &&
D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename &&
D.getNumTypeObjects() == 0) {
// Check also for this case:
//
// typedef int f();
// f a;
//
QualType TDType = GetTypeFromParser(DS.getTypeRep());
isFunc = TDType->isFunctionType();
}
bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified ||
DS.getStorageClassSpec() == DeclSpec::SCS_mutable) &&
!isFunc);
Decl *Member;
if (isInstField) {
// FIXME: Check for template parameters!
Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth,
AS);
assert(Member && "HandleField never returns null");
} else {
Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition)
.getAs<Decl>();
if (!Member) {
if (BitWidth) DeleteExpr(BitWidth);
return DeclPtrTy();
}
// Non-instance-fields can't have a bitfield.
if (BitWidth) {
if (Member->isInvalidDecl()) {
// don't emit another diagnostic.
} else if (isa<VarDecl>(Member)) {
// C++ 9.6p3: A bit-field shall not be a static member.
// "static member 'A' cannot be a bit-field"
Diag(Loc, diag::err_static_not_bitfield)
<< Name << BitWidth->getSourceRange();
} else if (isa<TypedefDecl>(Member)) {
// "typedef member 'x' cannot be a bit-field"
Diag(Loc, diag::err_typedef_not_bitfield)
<< Name << BitWidth->getSourceRange();
} else {
// A function typedef ("typedef int f(); f a;").
// C++ 9.6p3: A bit-field shall have integral or enumeration type.
Diag(Loc, diag::err_not_integral_type_bitfield)
<< Name << cast<ValueDecl>(Member)->getType()
<< BitWidth->getSourceRange();
}
DeleteExpr(BitWidth);
BitWidth = 0;
Member->setInvalidDecl();
}
Member->setAccess(AS);
// If we have declared a member function template, set the access of the
// templated declaration as well.
if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member))
FunTmpl->getTemplatedDecl()->setAccess(AS);
}
assert((Name || isInstField) && "No identifier for non-field ?");
if (Init)
AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false);
if (Deleted) // FIXME: Source location is not very good.
SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin());
if (isInstField) {
FieldCollector->Add(cast<FieldDecl>(Member));
return DeclPtrTy();
}
return DeclPtrTy::make(Member);
}
/// ActOnMemInitializer - Handle a C++ member initializer.
Sema::MemInitResult
Sema::ActOnMemInitializer(DeclPtrTy ConstructorD,
Scope *S,
const CXXScopeSpec &SS,
IdentifierInfo *MemberOrBase,
TypeTy *TemplateTypeTy,
SourceLocation IdLoc,
SourceLocation LParenLoc,
ExprTy **Args, unsigned NumArgs,
SourceLocation *CommaLocs,
SourceLocation RParenLoc) {
if (!ConstructorD)
return true;
AdjustDeclIfTemplate(ConstructorD);
CXXConstructorDecl *Constructor
= dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>());
if (!Constructor) {
// The user wrote a constructor initializer on a function that is
// not a C++ constructor. Ignore the error for now, because we may
// have more member initializers coming; we'll diagnose it just
// once in ActOnMemInitializers.
return true;
}
CXXRecordDecl *ClassDecl = Constructor->getParent();
// C++ [class.base.init]p2:
// Names in a mem-initializer-id are looked up in the scope of the
// 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,
LParenLoc, RParenLoc);
}
// It didn't name a member, so see if it names a class.
QualType BaseType;
TypeSourceInfo *TInfo = 0;
if (TemplateTypeTy) {
BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo);
} else {
LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName);
LookupParsedName(R, S, &SS);
TypeDecl *TyD = R.getAsSingle<TypeDecl>();
if (!TyD) {
if (R.isAmbiguous()) return true;
Diag(IdLoc, diag::err_mem_init_not_member_or_class)
<< MemberOrBase << SourceRange(IdLoc, RParenLoc);
return true;
}
BaseType = Context.getTypeDeclType(TyD);
if (SS.isSet()) {
NestedNameSpecifier *Qualifier =
static_cast<NestedNameSpecifier*>(SS.getScopeRep());
// FIXME: preserve source range information
BaseType = Context.getQualifiedNameType(Qualifier, BaseType);
}
}
if (!TInfo)
TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc);
return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs,
LParenLoc, RParenLoc, ClassDecl);
}
/// Checks an initializer expression for use of uninitialized fields, such as
/// containing the field that is being initialized. Returns true if there is an
/// uninitialized field was used an updates the SourceLocation parameter; false
/// otherwise.
static bool InitExprContainsUninitializedFields(const Stmt* S,
const FieldDecl* LhsField,
SourceLocation* L) {
const MemberExpr* ME = dyn_cast<MemberExpr>(S);
if (ME) {
const NamedDecl* RhsField = ME->getMemberDecl();
if (RhsField == LhsField) {
// Initializing a field with itself. Throw a warning.
// But wait; there are exceptions!
// Exception #1: The field may not belong to this record.
// e.g. Foo(const Foo& rhs) : A(rhs.A) {}
const Expr* base = ME->getBase();
if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) {
// Even though the field matches, it does not belong to this record.
return false;
}
// None of the exceptions triggered; return true to indicate an
// uninitialized field was used.
*L = ME->getMemberLoc();
return true;
}
}
bool found = false;
for (Stmt::const_child_iterator it = S->child_begin();
it != S->child_end() && found == false;
++it) {
if (isa<CallExpr>(S)) {
// Do not descend into function calls or constructors, as the use
// of an uninitialized field may be valid. One would have to inspect
// the contents of the function/ctor to determine if it is safe or not.
// i.e. Pass-by-value is never safe, but pass-by-reference and pointers
// may be safe, depending on what the function/ctor does.
continue;
}
found = InitExprContainsUninitializedFields(*it, LhsField, L);
}
return found;
}
Sema::MemInitResult
Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args,
unsigned NumArgs, SourceLocation IdLoc,
SourceLocation LParenLoc,
SourceLocation RParenLoc) {
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
ExprTemporaries.clear();
// Diagnose value-uses of fields to initialize themselves, e.g.
// foo(foo)
// where foo is not also a parameter to the constructor.
// TODO: implement -Wuninitialized and fold this into that framework.
for (unsigned i = 0; i < NumArgs; ++i) {
SourceLocation L;
if (InitExprContainsUninitializedFields(Args[i], Member, &L)) {
// FIXME: Return true in the case when other fields are used before being
// uninitialized. For example, let this field be the i'th field. When
// initializing the i'th field, throw a warning if any of the >= i'th
// fields are used, as they are not yet initialized.
// Right now we are only handling the case where the i'th field uses
// itself in its initializer.
Diag(L, diag::warn_field_is_uninit);
}
}
bool HasDependentArg = false;
for (unsigned i = 0; i < NumArgs; i++)
HasDependentArg |= Args[i]->isTypeDependent();
CXXConstructorDecl *C = 0;
QualType FieldType = Member->getType();
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (FieldType->isDependentType()) {
// Can't check init for dependent type.
} else if (FieldType->isRecordType()) {
// Member is a record (struct/union/class), so pass the initializer
// arguments down to the record's constructor.
if (!HasDependentArg) {
ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
C = PerformInitializationByConstructor(FieldType,
MultiExprArg(*this,
(void**)Args,
NumArgs),
IdLoc,
SourceRange(IdLoc, RParenLoc),
Member->getDeclName(),
InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc),
ConstructorArgs);
if (C) {
// Take over the constructor arguments as our own.
NumArgs = ConstructorArgs.size();
Args = (Expr **)ConstructorArgs.take();
}
}
} else if (NumArgs != 1 && NumArgs != 0) {
// The member type is not a record type (or an array of record
// types), so it can be only be default- or copy-initialized.
return Diag(IdLoc, diag::err_mem_initializer_mismatch)
<< Member->getDeclName() << SourceRange(IdLoc, RParenLoc);
} else if (!HasDependentArg) {
Expr *NewExp;
if (NumArgs == 0) {
if (FieldType->isReferenceType()) {
Diag(IdLoc, diag::err_null_intialized_reference_member)
<< Member->getDeclName();
return Diag(Member->getLocation(), diag::note_declared_at);
}
NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc);
NumArgs = 1;
}
else
NewExp = (Expr*)Args[0];
if (PerformCopyInitialization(NewExp, FieldType, AA_Passing))
return true;
Args[0] = NewExp;
}
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
ExprTemporaries.clear();
// FIXME: Perform direct initialization of the member.
return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc,
C, LParenLoc, (Expr **)Args,
NumArgs, RParenLoc);
}
Sema::MemInitResult
Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo,
Expr **Args, unsigned NumArgs,
SourceLocation LParenLoc, SourceLocation RParenLoc,
CXXRecordDecl *ClassDecl) {
bool HasDependentArg = false;
for (unsigned i = 0; i < NumArgs; i++)
HasDependentArg |= Args[i]->isTypeDependent();
SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin();
if (!BaseType->isDependentType()) {
if (!BaseType->isRecordType())
return Diag(BaseLoc, diag::err_base_init_does_not_name_class)
<< BaseType << BaseTInfo->getTypeLoc().getSourceRange();
// C++ [class.base.init]p2:
// [...] Unless the mem-initializer-id names a nonstatic data
// member of the 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.hasSameUnqualifiedType(BaseType, Base->getType())) {
// We found a direct base of this type. That's what we're
// initializing.
DirectBaseSpec = &*Base;
break;
}
}
// Check for a virtual base class.
// FIXME: We might be able to short-circuit this if we know in advance that
// there are no virtual bases.
const CXXBaseSpecifier *VirtualBaseSpec = 0;
if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) {
// We haven't found a base yet; search the class hierarchy for a
// virtual base class.
CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
/*DetectVirtual=*/false);
if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) {
for (CXXBasePaths::paths_iterator Path = Paths.begin();
Path != Paths.end(); ++Path) {
if (Path->back().Base->isVirtual()) {
VirtualBaseSpec = Path->back().Base;
break;
}
}
}
}
// C++ [base.class.init]p2:
// If a mem-initializer-id is ambiguous because it designates both
// a direct non-virtual base class and an inherited virtual base
// class, the mem-initializer is ill-formed.
if (DirectBaseSpec && VirtualBaseSpec)
return Diag(BaseLoc, diag::err_base_init_direct_and_virtual)
<< BaseType << BaseTInfo->getTypeLoc().getSourceRange();
// C++ [base.class.init]p2:
// Unless the mem-initializer-id names a nonstatic data membeer of the
// constructor's class ot a direst or virtual base of that class, the
// mem-initializer is ill-formed.
if (!DirectBaseSpec && !VirtualBaseSpec)
return Diag(BaseLoc, diag::err_not_direct_base_or_virtual)
<< BaseType << ClassDecl->getNameAsCString()
<< BaseTInfo->getTypeLoc().getSourceRange();
}
CXXConstructorDecl *C = 0;
if (!BaseType->isDependentType() && !HasDependentArg) {
DeclarationName Name = Context.DeclarationNames.getCXXConstructorName(
Context.getCanonicalType(BaseType).getUnqualifiedType());
ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
C = PerformInitializationByConstructor(BaseType,
MultiExprArg(*this,
(void**)Args, NumArgs),
BaseLoc,
SourceRange(BaseLoc, RParenLoc),
Name,
InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc),
ConstructorArgs);
if (C) {
// Take over the constructor arguments as our own.
NumArgs = ConstructorArgs.size();
Args = (Expr **)ConstructorArgs.take();
}
}
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
ExprTemporaries.clear();
return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, C,
LParenLoc, (Expr **)Args,
NumArgs, RParenLoc);
}
bool
Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor,
CXXBaseOrMemberInitializer **Initializers,
unsigned NumInitializers,
bool IsImplicitConstructor) {
// We need to build the initializer AST according to order of construction
// and not what user specified in the Initializers list.
CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext());
llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit;
llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields;
bool HasDependentBaseInit = false;
bool HadError = false;
for (unsigned i = 0; i < NumInitializers; i++) {
CXXBaseOrMemberInitializer *Member = Initializers[i];
if (Member->isBaseInitializer()) {
if (Member->getBaseClass()->isDependentType())
HasDependentBaseInit = true;
AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member;
} else {
AllBaseFields[Member->getMember()] = Member;
}
}
if (HasDependentBaseInit) {
// FIXME. This does not preserve the ordering of the initializers.
// Try (with -Wreorder)
// template<class X> struct A {};
// template<class X> struct B : A<X> {
// B() : x1(10), A<X>() {}
// int x1;
// };
// B<int> x;
// On seeing one dependent type, we should essentially exit this routine
// while preserving user-declared initializer list. When this routine is
// called during instantiatiation process, this routine will rebuild the
// ordered initializer list correctly.
// If we have a dependent base initialization, we can't determine the
// association between initializers and bases; just dump the known
// initializers into the list, and don't try to deal with other bases.
for (unsigned i = 0; i < NumInitializers; i++) {
CXXBaseOrMemberInitializer *Member = Initializers[i];
if (Member->isBaseInitializer())
AllToInit.push_back(Member);
}
} else {
// Push virtual bases before others.
for (CXXRecordDecl::base_class_iterator VBase =
ClassDecl->vbases_begin(),
E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
if (VBase->getType()->isDependentType())
continue;
if (CXXBaseOrMemberInitializer *Value
= AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) {
AllToInit.push_back(Value);
}
else {
CXXRecordDecl *VBaseDecl =
cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl());
assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null");
CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context);
if (!Ctor) {
Diag(Constructor->getLocation(), diag::err_missing_default_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 0 << VBase->getType();
Diag(VBaseDecl->getLocation(), diag::note_previous_decl)
<< Context.getTagDeclType(VBaseDecl);
HadError = true;
continue;
}
ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this);
if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0),
Constructor->getLocation(), CtorArgs))
continue;
MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if
// necessary.
// FIXME: Is there any better source-location information we can give?
ExprTemporaries.clear();
CXXBaseOrMemberInitializer *Member =
new (Context) CXXBaseOrMemberInitializer(Context,
Context.getTrivialTypeSourceInfo(VBase->getType(),
SourceLocation()),
Ctor,
SourceLocation(),
CtorArgs.takeAs<Expr>(),
CtorArgs.size(),
SourceLocation());
AllToInit.push_back(Member);
}
}
for (CXXRecordDecl::base_class_iterator Base =
ClassDecl->bases_begin(),
E = ClassDecl->bases_end(); Base != E; ++Base) {
// Virtuals are in the virtual base list and already constructed.
if (Base->isVirtual())
continue;
// Skip dependent types.
if (Base->getType()->isDependentType())
continue;
if (CXXBaseOrMemberInitializer *Value
= AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) {
AllToInit.push_back(Value);
}
else {
CXXRecordDecl *BaseDecl =
cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null");
CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context);
if (!Ctor) {
Diag(Constructor->getLocation(), diag::err_missing_default_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 0 << Base->getType();
Diag(BaseDecl->getLocation(), diag::note_previous_decl)
<< Context.getTagDeclType(BaseDecl);
HadError = true;
continue;
}
ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this);
if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0),
Constructor->getLocation(), CtorArgs))
continue;
MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if
// necessary.
// FIXME: Is there any better source-location information we can give?
ExprTemporaries.clear();
CXXBaseOrMemberInitializer *Member =
new (Context) CXXBaseOrMemberInitializer(Context,
Context.getTrivialTypeSourceInfo(Base->getType(),
SourceLocation()),
Ctor,
SourceLocation(),
CtorArgs.takeAs<Expr>(),
CtorArgs.size(),
SourceLocation());
AllToInit.push_back(Member);
}
}
}
// non-static data members.
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
E = ClassDecl->field_end(); Field != E; ++Field) {
if ((*Field)->isAnonymousStructOrUnion()) {
if (const RecordType *FieldClassType =
Field->getType()->getAs<RecordType>()) {
CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(),
EA = FieldClassDecl->field_end(); FA != EA; FA++) {
if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) {
// 'Member' is the anonymous union field and 'AnonUnionMember' is
// set to the anonymous union data member used in the initializer
// list.
Value->setMember(*Field);
Value->setAnonUnionMember(*FA);
AllToInit.push_back(Value);
break;
}
}
}
continue;
}
if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) {
AllToInit.push_back(Value);
continue;
}
if ((*Field)->getType()->isDependentType())
continue;
QualType FT = Context.getBaseElementType((*Field)->getType());
if (const RecordType* RT = FT->getAs<RecordType>()) {
CXXConstructorDecl *Ctor =
cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context);
if (!Ctor) {
Diag(Constructor->getLocation(), diag::err_missing_default_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 1 << (*Field)->getDeclName();
Diag(Field->getLocation(), diag::note_field_decl);
Diag(RT->getDecl()->getLocation(), diag::note_previous_decl)
<< Context.getTagDeclType(RT->getDecl());
HadError = true;
continue;
}
if (FT.isConstQualified() && Ctor->isTrivial()) {
Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 1 << (*Field)->getDeclName();
Diag((*Field)->getLocation(), diag::note_declared_at);
HadError = true;
}
// Don't create initializers for trivial constructors, since they don't
// actually need to be run.
if (Ctor->isTrivial())
continue;
ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this);
if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0),
Constructor->getLocation(), CtorArgs))
continue;
// FIXME: CXXBaseOrMemberInitializer should only contain a single
// subexpression so we can wrap it in a CXXExprWithTemporaries if necessary.
ExprTemporaries.clear();
CXXBaseOrMemberInitializer *Member =
new (Context) CXXBaseOrMemberInitializer(Context,
*Field, SourceLocation(),
Ctor,
SourceLocation(),
CtorArgs.takeAs<Expr>(),
CtorArgs.size(),
SourceLocation());
AllToInit.push_back(Member);
MarkDeclarationReferenced(Constructor->getLocation(), Ctor);
}
else if (FT->isReferenceType()) {
Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 0 << (*Field)->getDeclName();
Diag((*Field)->getLocation(), diag::note_declared_at);
HadError = true;
}
else if (FT.isConstQualified()) {
Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor)
<< (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl)
<< 1 << (*Field)->getDeclName();
Diag((*Field)->getLocation(), diag::note_declared_at);
HadError = true;
}
}
NumInitializers = AllToInit.size();
if (NumInitializers > 0) {
Constructor->setNumBaseOrMemberInitializers(NumInitializers);
CXXBaseOrMemberInitializer **baseOrMemberInitializers =
new (Context) CXXBaseOrMemberInitializer*[NumInitializers];
Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers);
for (unsigned Idx = 0; Idx < NumInitializers; ++Idx)
baseOrMemberInitializers[Idx] = AllToInit[Idx];
}
return HadError;
}
static void *GetKeyForTopLevelField(FieldDecl *Field) {
// For anonymous unions, use the class declaration as the key.
if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
if (RT->getDecl()->isAnonymousStructOrUnion())
return static_cast<void *>(RT->getDecl());
}
return static_cast<void *>(Field);
}
static void *GetKeyForBase(QualType BaseType) {
if (const RecordType *RT = BaseType->getAs<RecordType>())
return (void *)RT;
assert(0 && "Unexpected base type!");
return 0;
}
static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member,
bool MemberMaybeAnon = false) {
// For fields injected into the class via declaration of an anonymous union,
// use its anonymous union class declaration as the unique key.
if (Member->isMemberInitializer()) {
FieldDecl *Field = Member->getMember();
// After SetBaseOrMemberInitializers call, Field is the anonymous union
// data member of the class. Data member used in the initializer list is
// in AnonUnionMember field.
if (MemberMaybeAnon && Field->isAnonymousStructOrUnion())
Field = Member->getAnonUnionMember();
if (Field->getDeclContext()->isRecord()) {
RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext());
if (RD->isAnonymousStructOrUnion())
return static_cast<void *>(RD);
}
return static_cast<void *>(Field);
}
return GetKeyForBase(QualType(Member->getBaseClass(), 0));
}
/// ActOnMemInitializers - Handle the member initializers for a constructor.
void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
SourceLocation ColonLoc,
MemInitTy **MemInits, unsigned NumMemInits) {
if (!ConstructorDecl)
return;
AdjustDeclIfTemplate(ConstructorDecl);
CXXConstructorDecl *Constructor
= dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>());
if (!Constructor) {
Diag(ColonLoc, diag::err_only_constructors_take_base_inits);
return;
}
if (!Constructor->isDependentContext()) {
llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members;
bool err = false;
for (unsigned i = 0; i < NumMemInits; i++) {
CXXBaseOrMemberInitializer *Member =
static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]);
void *KeyToMember = GetKeyForMember(Member);
CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember];
if (!PrevMember) {
PrevMember = Member;
continue;
}
if (FieldDecl *Field = Member->getMember())
Diag(Member->getSourceLocation(),
diag::error_multiple_mem_initialization)
<< Field->getNameAsString()
<< Member->getSourceRange();
else {
Type *BaseClass = Member->getBaseClass();
assert(BaseClass && "ActOnMemInitializers - neither field or base");
Diag(Member->getSourceLocation(),
diag::error_multiple_base_initialization)
<< QualType(BaseClass, 0)
<< Member->getSourceRange();
}
Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer)
<< 0;
err = true;
}
if (err)
return;
}
SetBaseOrMemberInitializers(Constructor,
reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits),
NumMemInits, false);
if (Constructor->isDependentContext())
return;
if (Diags.getDiagnosticLevel(diag::warn_base_initialized) ==
Diagnostic::Ignored &&
Diags.getDiagnosticLevel(diag::warn_field_initialized) ==
Diagnostic::Ignored)
return;
// Also issue warning if order of ctor-initializer list does not match order
// of 1) base class declarations and 2) order of non-static data members.
llvm::SmallVector<const void*, 32> AllBaseOrMembers;
CXXRecordDecl *ClassDecl
= cast<CXXRecordDecl>(Constructor->getDeclContext());
// Push virtual bases before others.
for (CXXRecordDecl::base_class_iterator VBase =
ClassDecl->vbases_begin(),
E = ClassDecl->vbases_end(); VBase != E; ++VBase)
AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType()));
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
E = ClassDecl->bases_end(); Base != E; ++Base) {
// Virtuals are alread in the virtual base list and are constructed
// first.
if (Base->isVirtual())
continue;
AllBaseOrMembers.push_back(GetKeyForBase(Base->getType()));
}
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
E = ClassDecl->field_end(); Field != E; ++Field)
AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field));
int Last = AllBaseOrMembers.size();
int curIndex = 0;
CXXBaseOrMemberInitializer *PrevMember = 0;
for (unsigned i = 0; i < NumMemInits; i++) {
CXXBaseOrMemberInitializer *Member =
static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]);
void *MemberInCtorList = GetKeyForMember(Member, true);
for (; curIndex < Last; curIndex++)
if (MemberInCtorList == AllBaseOrMembers[curIndex])
break;
if (curIndex == Last) {
assert(PrevMember && "Member not in member list?!");
// Initializer as specified in ctor-initializer list is out of order.
// Issue a warning diagnostic.
if (PrevMember->isBaseInitializer()) {
// Diagnostics is for an initialized base class.
Type *BaseClass = PrevMember->getBaseClass();
Diag(PrevMember->getSourceLocation(),
diag::warn_base_initialized)
<< QualType(BaseClass, 0);
} else {
FieldDecl *Field = PrevMember->getMember();
Diag(PrevMember->getSourceLocation(),
diag::warn_field_initialized)
<< Field->getNameAsString();
}
// Also the note!
if (FieldDecl *Field = Member->getMember())
Diag(Member->getSourceLocation(),
diag::note_fieldorbase_initialized_here) << 0
<< Field->getNameAsString();
else {
Type *BaseClass = Member->getBaseClass();
Diag(Member->getSourceLocation(),
diag::note_fieldorbase_initialized_here) << 1
<< QualType(BaseClass, 0);
}
for (curIndex = 0; curIndex < Last; curIndex++)
if (MemberInCtorList == AllBaseOrMembers[curIndex])
break;
}
PrevMember = Member;
}
}
void
Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) {
// Ignore dependent destructors.
if (Destructor->isDependentContext())
return;
CXXRecordDecl *ClassDecl = Destructor->getParent();
// Non-static data members.
for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(),
E = ClassDecl->field_end(); I != E; ++I) {
FieldDecl *Field = *I;
QualType FieldType = Context.getBaseElementType(Field->getType());
const RecordType* RT = FieldType->getAs<RecordType>();
if (!RT)
continue;
CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl());
if (FieldClassDecl->hasTrivialDestructor())
continue;
const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context);
MarkDeclarationReferenced(Destructor->getLocation(),
const_cast<CXXDestructorDecl*>(Dtor));
}
// Bases.
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
E = ClassDecl->bases_end(); Base != E; ++Base) {
// Ignore virtual bases.
if (Base->isVirtual())
continue;
// Ignore trivial destructors.
CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
if (BaseClassDecl->hasTrivialDestructor())
continue;
const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context);
MarkDeclarationReferenced(Destructor->getLocation(),
const_cast<CXXDestructorDecl*>(Dtor));
}
// Virtual bases.
for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(),
E = ClassDecl->vbases_end(); VBase != E; ++VBase) {
// Ignore trivial destructors.
CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl());
if (BaseClassDecl->hasTrivialDestructor())
continue;
const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context);
MarkDeclarationReferenced(Destructor->getLocation(),
const_cast<CXXDestructorDecl*>(Dtor));
}
}
void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) {
if (!CDtorDecl)
return;
AdjustDeclIfTemplate(CDtorDecl);
if (CXXConstructorDecl *Constructor
= dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>()))
SetBaseOrMemberInitializers(Constructor, 0, 0, false);
}
namespace {
/// PureVirtualMethodCollector - traverses a class and its superclasses
/// and determines if it has any pure virtual methods.
class PureVirtualMethodCollector {
ASTContext &Context;
public:
typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList;
private:
MethodList Methods;
void Collect(const CXXRecordDecl* RD, MethodList& Methods);
public:
PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD)
: Context(Ctx) {
MethodList List;
Collect(RD, List);
// Copy the temporary list to methods, and make sure to ignore any
// null entries.
for (size_t i = 0, e = List.size(); i != e; ++i) {
if (List[i])
Methods.push_back(List[i]);
}
}
bool empty() const { return Methods.empty(); }
MethodList::const_iterator methods_begin() { return Methods.begin(); }
MethodList::const_iterator methods_end() { return Methods.end(); }
};
void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD,
MethodList& Methods) {
// First, collect the pure virtual methods for the base classes.
for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) {
if (const RecordType *RT = Base->getType()->getAs<RecordType>()) {
const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl());
if (BaseDecl && BaseDecl->isAbstract())
Collect(BaseDecl, Methods);
}
}
// Next, zero out any pure virtual methods that this class overrides.
typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy;
MethodSetTy OverriddenMethods;
size_t MethodsSize = Methods.size();
for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end();
i != e; ++i) {
// Traverse the record, looking for methods.
if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) {
// If the method is pure virtual, add it to the methods vector.
if (MD->isPure())
Methods.push_back(MD);
// Record all the overridden methods in our set.
for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
E = MD->end_overridden_methods(); I != E; ++I) {
// Keep track of the overridden methods.
OverriddenMethods.insert(*I);
}
}
}
// Now go through the methods and zero out all the ones we know are
// overridden.
for (size_t i = 0, e = MethodsSize; i != e; ++i) {
if (OverriddenMethods.count(Methods[i]))
Methods[i] = 0;
}
}
}
bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
unsigned DiagID, AbstractDiagSelID SelID,
const CXXRecordDecl *CurrentRD) {
if (SelID == -1)
return RequireNonAbstractType(Loc, T,
PDiag(DiagID), CurrentRD);
else
return RequireNonAbstractType(Loc, T,
PDiag(DiagID) << SelID, CurrentRD);
}
bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T,
const PartialDiagnostic &PD,
const CXXRecordDecl *CurrentRD) {
if (!getLangOptions().CPlusPlus)
return false;
if (const ArrayType *AT = Context.getAsArrayType(T))
return RequireNonAbstractType(Loc, AT->getElementType(), PD,
CurrentRD);
if (const PointerType *PT = T->getAs<PointerType>()) {
// Find the innermost pointer type.
while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>())
PT = T;
if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType()))
return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD);
}
const RecordType *RT = T->getAs<RecordType>();
if (!RT)
return false;
const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
if (!RD)
return false;
if (CurrentRD && CurrentRD != RD)
return false;
if (!RD->isAbstract())
return false;
Diag(Loc, PD) << RD->getDeclName();
// Check if we've already emitted the list of pure virtual functions for this
// class.
if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD))
return true;
PureVirtualMethodCollector Collector(Context, RD);
for (PureVirtualMethodCollector::MethodList::const_iterator I =
Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) {
const CXXMethodDecl *MD = *I;
Diag(MD->getLocation(), diag::note_pure_virtual_function) <<
MD->getDeclName();
}
if (!PureVirtualClassDiagSet)
PureVirtualClassDiagSet.reset(new RecordDeclSetTy);
PureVirtualClassDiagSet->insert(RD);
return true;
}
namespace {
class AbstractClassUsageDiagnoser
: public DeclVisitor<AbstractClassUsageDiagnoser, bool> {
Sema &SemaRef;
CXXRecordDecl *AbstractClass;
bool VisitDeclContext(const DeclContext *DC) {
bool Invalid = false;
for (CXXRecordDecl::decl_iterator I = DC->decls_begin(),
E = DC->decls_end(); I != E; ++I)
Invalid |= Visit(*I);
return Invalid;
}
public:
AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac)
: SemaRef(SemaRef), AbstractClass(ac) {
Visit(SemaRef.Context.getTranslationUnitDecl());
}
bool VisitFunctionDecl(const FunctionDecl *FD) {
if (FD->isThisDeclarationADefinition()) {
// No need to do the check if we're in a definition, because it requires
// that the return/param types are complete.
// because that requires
return VisitDeclContext(FD);
}
// Check the return type.
QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType();
bool Invalid =
SemaRef.RequireNonAbstractType(FD->getLocation(), RTy,
diag::err_abstract_type_in_decl,
Sema::AbstractReturnType,
AbstractClass);
for (FunctionDecl::param_const_iterator I = FD->param_begin(),
E = FD->param_end(); I != E; ++I) {
const ParmVarDecl *VD = *I;
Invalid |=
SemaRef.RequireNonAbstractType(VD->getLocation(),
VD->getOriginalType(),
diag::err_abstract_type_in_decl,
Sema::AbstractParamType,
AbstractClass);
}
return Invalid;
}
bool VisitDecl(const Decl* D) {
if (const DeclContext *DC = dyn_cast<DeclContext>(D))
return VisitDeclContext(DC);
return false;
}
};
}
/// \brief Perform semantic checks on a class definition that has been
/// completing, introducing implicitly-declared members, checking for
/// abstract types, etc.
void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) {
if (!Record || Record->isInvalidDecl())
return;
if (!Record->isDependentType())
AddImplicitlyDeclaredMembersToClass(Record);
if (Record->isInvalidDecl())
return;
if (!Record->isAbstract()) {
// Collect all the pure virtual methods and see if this is an abstract
// class after all.
PureVirtualMethodCollector Collector(Context, Record);
if (!Collector.empty())
Record->setAbstract(true);
}
if (Record->isAbstract())
(void)AbstractClassUsageDiagnoser(*this, Record);
}
void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
DeclPtrTy TagDecl,
SourceLocation LBrac,
SourceLocation RBrac) {
if (!TagDecl)
return;
AdjustDeclIfTemplate(TagDecl);
ActOnFields(S, RLoc, TagDecl,
(DeclPtrTy*)FieldCollector->getCurFields(),
FieldCollector->getCurNumFields(), LBrac, RBrac, 0);
CheckCompletedCXXClass(
dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>()));
}
/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
/// special functions, such as the default constructor, copy
/// constructor, or destructor, to the given C++ class (C++
/// [special]p1). This routine can only be executed just before the
/// definition of the class is complete.
void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
CanQualType ClassType
= Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
// FIXME: Implicit declarations have exception specifications, which are
// the union of the specifications of the implicitly called functions.
if (!ClassDecl->hasUserDeclaredConstructor()) {
// C++ [class.ctor]p5:
// A default constructor for a class X is a constructor of class X
// that can be called without an argument. If there is no
// user-declared constructor for class X, a default constructor is
// implicitly declared. An implicitly-declared default constructor
// is an inline public member of its class.
DeclarationName Name
= Context.DeclarationNames.getCXXConstructorName(ClassType);
CXXConstructorDecl *DefaultCon =
CXXConstructorDecl::Create(Context, ClassDecl,
ClassDecl->getLocation(), Name,
Context.getFunctionType(Context.VoidTy,
0, 0, false, 0),
/*TInfo=*/0,
/*isExplicit=*/false,
/*isInline=*/true,
/*isImplicitlyDeclared=*/true);
DefaultCon->setAccess(AS_public);
DefaultCon->setImplicit();
DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor());
ClassDecl->addDecl(DefaultCon);
}
if (!ClassDecl->hasUserDeclaredCopyConstructor()) {
// C++ [class.copy]p4:
// If the class definition does not explicitly declare a copy
// constructor, one is declared implicitly.
// C++ [class.copy]p5:
// The implicitly-declared copy constructor for a class X will
// have the form
//
// X::X(const X&)
//
// if
bool HasConstCopyConstructor = true;
// -- each direct or virtual base class B of X has a copy
// constructor whose first parameter is of type const B& or
// const volatile B&, and
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) {
const CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
HasConstCopyConstructor
= BaseClassDecl->hasConstCopyConstructor(Context);
}
// -- for all the nonstatic data members of X that are of a
// class type M (or array thereof), each such class type
// has a copy constructor whose first parameter is of type
// const M& or const volatile M&.
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin();
HasConstCopyConstructor && Field != ClassDecl->field_end();
++Field) {
QualType FieldType = (*Field)->getType();
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
const CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
HasConstCopyConstructor
= FieldClassDecl->hasConstCopyConstructor(Context);
}
}
// Otherwise, the implicitly declared copy constructor will have
// the form
//
// X::X(X&)
QualType ArgType = ClassType;
if (HasConstCopyConstructor)
ArgType = ArgType.withConst();
ArgType = Context.getLValueReferenceType(ArgType);
// An implicitly-declared copy constructor is an inline public
// member of its class.
DeclarationName Name
= Context.DeclarationNames.getCXXConstructorName(ClassType);
CXXConstructorDecl *CopyConstructor
= CXXConstructorDecl::Create(Context, ClassDecl,
ClassDecl->getLocation(), Name,
Context.getFunctionType(Context.VoidTy,
&ArgType, 1,
false, 0),
/*TInfo=*/0,
/*isExplicit=*/false,
/*isInline=*/true,
/*isImplicitlyDeclared=*/true);
CopyConstructor->setAccess(AS_public);
CopyConstructor->setImplicit();
CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor());
// Add the parameter to the constructor.
ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor,
ClassDecl->getLocation(),
/*IdentifierInfo=*/0,
ArgType, /*TInfo=*/0,
VarDecl::None, 0);
CopyConstructor->setParams(Context, &FromParam, 1);
ClassDecl->addDecl(CopyConstructor);
}
if (!ClassDecl->hasUserDeclaredCopyAssignment()) {
// Note: The following rules are largely analoguous to the copy
// constructor rules. Note that virtual bases are not taken into account
// for determining the argument type of the operator. Note also that
// operators taking an object instead of a reference are allowed.
//
// C++ [class.copy]p10:
// If the class definition does not explicitly declare a copy
// assignment operator, one is declared implicitly.
// The implicitly-defined copy assignment operator for a class X
// will have the form
//
// X& X::operator=(const X&)
//
// if
bool HasConstCopyAssignment = true;
// -- each direct base class B of X has a copy assignment operator
// whose parameter is of type const B&, const volatile B& or B,
// and
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) {
assert(!Base->getType()->isDependentType() &&
"Cannot generate implicit members for class with dependent bases.");
const CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
const CXXMethodDecl *MD = 0;
HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context,
MD);
}
// -- for all the nonstatic data members of X that are of a class
// type M (or array thereof), each such class type has a copy
// assignment operator whose parameter is of type const M&,
// const volatile M& or M.
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin();
HasConstCopyAssignment && Field != ClassDecl->field_end();
++Field) {
QualType FieldType = (*Field)->getType();
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
const CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
const CXXMethodDecl *MD = 0;
HasConstCopyAssignment
= FieldClassDecl->hasConstCopyAssignment(Context, MD);
}
}
// Otherwise, the implicitly declared copy assignment operator will
// have the form
//
// X& X::operator=(X&)
QualType ArgType = ClassType;
QualType RetType = Context.getLValueReferenceType(ArgType);
if (HasConstCopyAssignment)
ArgType = ArgType.withConst();
ArgType = Context.getLValueReferenceType(ArgType);
// An implicitly-declared copy assignment operator is an inline public
// member of its class.
DeclarationName Name =
Context.DeclarationNames.getCXXOperatorName(OO_Equal);
CXXMethodDecl *CopyAssignment =
CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name,
Context.getFunctionType(RetType, &ArgType, 1,
false, 0),
/*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true);
CopyAssignment->setAccess(AS_public);
CopyAssignment->setImplicit();
CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment());
CopyAssignment->setCopyAssignment(true);
// Add the parameter to the operator.
ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment,
ClassDecl->getLocation(),
/*IdentifierInfo=*/0,
ArgType, /*TInfo=*/0,
VarDecl::None, 0);
CopyAssignment->setParams(Context, &FromParam, 1);
// Don't call addedAssignmentOperator. There is no way to distinguish an
// implicit from an explicit assignment operator.
ClassDecl->addDecl(CopyAssignment);
AddOverriddenMethods(ClassDecl, CopyAssignment);
}
if (!ClassDecl->hasUserDeclaredDestructor()) {
// C++ [class.dtor]p2:
// If a class has no user-declared destructor, a destructor is
// declared implicitly. An implicitly-declared destructor is an
// inline public member of its class.
DeclarationName Name
= Context.DeclarationNames.getCXXDestructorName(ClassType);
CXXDestructorDecl *Destructor
= CXXDestructorDecl::Create(Context, ClassDecl,
ClassDecl->getLocation(), Name,
Context.getFunctionType(Context.VoidTy,
0, 0, false, 0),
/*isInline=*/true,
/*isImplicitlyDeclared=*/true);
Destructor->setAccess(AS_public);
Destructor->setImplicit();
Destructor->setTrivial(ClassDecl->hasTrivialDestructor());
ClassDecl->addDecl(Destructor);
AddOverriddenMethods(ClassDecl, Destructor);
}
}
void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) {
Decl *D = TemplateD.getAs<Decl>();
if (!D)
return;
TemplateParameterList *Params = 0;
if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D))
Params = Template->getTemplateParameters();
else if (ClassTemplatePartialSpecializationDecl *PartialSpec
= dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
Params = PartialSpec->getTemplateParameters();
else
return;
for (TemplateParameterList::iterator Param = Params->begin(),
ParamEnd = Params->end();
Param != ParamEnd; ++Param) {
NamedDecl *Named = cast<NamedDecl>(*Param);
if (Named->getDeclName()) {
S->AddDecl(DeclPtrTy::make(Named));
IdResolver.AddDecl(Named);
}
}
}
void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) {
if (!RecordD) return;
AdjustDeclIfTemplate(RecordD);
CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>());
PushDeclContext(S, Record);
}
void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) {
if (!RecordD) return;
PopDeclContext();
}
/// 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) {
}
/// ActOnDelayedCXXMethodParameter - We've already started a delayed
/// C++ method declaration. We're (re-)introducing the given
/// function parameter into scope for use in parsing later parts of
/// the method declaration. For example, we could see an
/// ActOnParamDefaultArgument event for this parameter.
void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) {
if (!ParamD)
return;
ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>());
// If this parameter has an unparsed default argument, clear it out
// to make way for the parsed default argument.
if (Param->hasUnparsedDefaultArg())
Param->setDefaultArg(0);
S->AddDecl(DeclPtrTy::make(Param));
if (Param->getDeclName())
IdResolver.AddDecl(Param);
}
/// ActOnFinishDelayedCXXMethodDeclaration - We have finished
/// processing the delayed method declaration for Method. The method
/// declaration is now considered finished. There may be a separate
/// ActOnStartOfFunctionDef action later (not necessarily
/// immediately!) for this method, if it was also defined inside the
/// class body.
void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) {
if (!MethodD)
return;
AdjustDeclIfTemplate(MethodD);
FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>());
// Now that we have our default arguments, check the constructor
// again. It could produce additional diagnostics or affect whether
// the class has implicitly-declared destructors, among other
// things.
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method))
CheckConstructor(Constructor);
// Check the default arguments, which we may have added.
if (!Method->isInvalidDecl())
CheckCXXDefaultArguments(Method);
}
/// CheckConstructorDeclarator - Called by ActOnDeclarator to check
/// the well-formedness of the constructor declarator @p D with type @p
/// R. If there are any errors in the declarator, this routine will
/// emit diagnostics and set the invalid bit to true. In any case, the type
/// will be updated to reflect a well-formed type for the constructor and
/// returned.
QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R,
FunctionDecl::StorageClass &SC) {
bool isVirtual = D.getDeclSpec().isVirtualSpecified();
// C++ [class.ctor]p3:
// A constructor shall not be virtual (10.3) or static (9.4). A
// constructor can be invoked for a const, volatile or const
// volatile object. A constructor shall not be declared const,
// volatile, or const volatile (9.3.2).
if (isVirtual) {
if (!D.isInvalidType())
Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
<< "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc())
<< SourceRange(D.getIdentifierLoc());
D.setInvalidType();
}
if (SC == FunctionDecl::Static) {
if (!D.isInvalidType())
Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be)
<< "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
<< SourceRange(D.getIdentifierLoc());
D.setInvalidType();
SC = FunctionDecl::None;
}
DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
if (FTI.TypeQuals != 0) {
if (FTI.TypeQuals & Qualifiers::Const)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "const" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & Qualifiers::Volatile)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "volatile" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & Qualifiers::Restrict)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor)
<< "restrict" << SourceRange(D.getIdentifierLoc());
}
// Rebuild the function type "R" without any type qualifiers (in
// case any of the errors above fired) and with "void" as the
// return type, since constructors don't have return types. We
// *always* have to do this, because GetTypeForDeclarator will
// put in a result type of "int" when none was specified.
const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(),
Proto->getNumArgs(),
Proto->isVariadic(), 0);
}
/// CheckConstructor - Checks a fully-formed constructor for
/// well-formedness, issuing any diagnostics required. Returns true if
/// the constructor declarator is invalid.
void Sema::CheckConstructor(CXXConstructorDecl *Constructor) {
CXXRecordDecl *ClassDecl
= dyn_cast<CXXRecordDecl>(Constructor->getDeclContext());
if (!ClassDecl)
return Constructor->setInvalidDecl();
// C++ [class.copy]p3:
// A declaration of a constructor for a class X is ill-formed if
// its first parameter is of type (optionally cv-qualified) X and
// either there are no other parameters or else all other
// parameters have default arguments.
if (!Constructor->isInvalidDecl() &&
((Constructor->getNumParams() == 1) ||
(Constructor->getNumParams() > 1 &&
Constructor->getParamDecl(1)->hasDefaultArg())) &&
Constructor->getTemplateSpecializationKind()
!= TSK_ImplicitInstantiation) {
QualType ParamType = Constructor->getParamDecl(0)->getType();
QualType ClassTy = Context.getTagDeclType(ClassDecl);
if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) {
SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation();
Diag(ParamLoc, diag::err_constructor_byvalue_arg)
<< CodeModificationHint::CreateInsertion(ParamLoc, " const &");
// FIXME: Rather that making the constructor invalid, we should endeavor
// to fix the type.
Constructor->setInvalidDecl();
}
}
// Notify the class that we've added a constructor.
ClassDecl->addedConstructor(Context, Constructor);
}
/// CheckDestructor - Checks a fully-formed destructor for well-formedness,
/// issuing any diagnostics required. Returns true on error.
bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) {
CXXRecordDecl *RD = Destructor->getParent();
if (Destructor->isVirtual()) {
SourceLocation Loc;
if (!Destructor->isImplicit())
Loc = Destructor->getLocation();
else
Loc = RD->getLocation();
// If we have a virtual destructor, look up the deallocation function
FunctionDecl *OperatorDelete = 0;
DeclarationName Name =
Context.DeclarationNames.getCXXOperatorName(OO_Delete);
if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete))
return true;
Destructor->setOperatorDelete(OperatorDelete);
}
return false;
}
static inline bool
FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) {
return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
FTI.ArgInfo[0].Param &&
FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType());
}
/// CheckDestructorDeclarator - Called by ActOnDeclarator to check
/// the well-formednes of the destructor declarator @p D with type @p
/// R. If there are any errors in the declarator, this routine will
/// emit diagnostics and set the declarator to invalid. Even if this happens,
/// will be updated to reflect a well-formed type for the destructor and
/// returned.
QualType Sema::CheckDestructorDeclarator(Declarator &D,
FunctionDecl::StorageClass& SC) {
// C++ [class.dtor]p1:
// [...] A typedef-name that names a class is a class-name
// (7.1.3); however, a typedef-name that names a class shall not
// be used as the identifier in the declarator for a destructor
// declaration.
QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName);
if (isa<TypedefType>(DeclaratorType)) {
Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name)
<< DeclaratorType;
D.setInvalidType();
}
// C++ [class.dtor]p2:
// A destructor is used to destroy objects of its class type. A
// destructor takes no parameters, and no return type can be
// specified for it (not even void). The address of a destructor
// shall not be taken. A destructor shall not be static. A
// destructor can be invoked for a const, volatile or const
// volatile object. A destructor shall not be declared const,
// volatile or const volatile (9.3.2).
if (SC == FunctionDecl::Static) {
if (!D.isInvalidType())
Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be)
<< "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
<< SourceRange(D.getIdentifierLoc());
SC = FunctionDecl::None;
D.setInvalidType();
}
if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
// Destructors don't have return types, but the parser will
// happily parse something like:
//
// class X {
// float ~X();
// };
//
// The return type will be eliminated later.
Diag(D.getIdentifierLoc(), diag::err_destructor_return_type)
<< SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
<< SourceRange(D.getIdentifierLoc());
}
DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
if (FTI.TypeQuals != 0 && !D.isInvalidType()) {
if (FTI.TypeQuals & Qualifiers::Const)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "const" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & Qualifiers::Volatile)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "volatile" << SourceRange(D.getIdentifierLoc());
if (FTI.TypeQuals & Qualifiers::Restrict)
Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor)
<< "restrict" << SourceRange(D.getIdentifierLoc());
D.setInvalidType();
}
// Make sure we don't have any parameters.
if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) {
Diag(D.getIdentifierLoc(), diag::err_destructor_with_params);
// Delete the parameters.
FTI.freeArgs();
D.setInvalidType();
}
// Make sure the destructor isn't variadic.
if (FTI.isVariadic) {
Diag(D.getIdentifierLoc(), diag::err_destructor_variadic);
D.setInvalidType();
}
// Rebuild the function type "R" without any type qualifiers or
// parameters (in case any of the errors above fired) and with
// "void" as the return type, since destructors don't have return
// types. We *always* have to do this, because GetTypeForDeclarator
// will put in a result type of "int" when none was specified.
return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0);
}
/// CheckConversionDeclarator - Called by ActOnDeclarator to check the
/// well-formednes of the conversion function declarator @p D with
/// type @p R. If there are any errors in the declarator, this routine
/// will emit diagnostics and return true. Otherwise, it will return
/// false. Either way, the type @p R will be updated to reflect a
/// well-formed type for the conversion operator.
void Sema::CheckConversionDeclarator(Declarator &D, QualType &R,
FunctionDecl::StorageClass& SC) {
// C++ [class.conv.fct]p1:
// Neither parameter types nor return type can be specified. The
// type of a conversion function (8.3.5) is "function taking no
// parameter returning conversion-type-id."
if (SC == FunctionDecl::Static) {
if (!D.isInvalidType())
Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member)
<< "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc())
<< SourceRange(D.getIdentifierLoc());
D.setInvalidType();
SC = FunctionDecl::None;
}
if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
// Conversion functions don't have return types, but the parser will
// happily parse something like:
//
// class X {
// float operator bool();
// };
//
// The return type will be changed later anyway.
Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type)
<< SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
<< SourceRange(D.getIdentifierLoc());
}
// Make sure we don't have any parameters.
if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params);
// Delete the parameters.
D.getTypeObject(0).Fun.freeArgs();
D.setInvalidType();
}
// Make sure the conversion function isn't variadic.
if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic);
D.setInvalidType();
}
// C++ [class.conv.fct]p4:
// The conversion-type-id shall not represent a function type nor
// an array type.
QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId);
if (ConvType->isArrayType()) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array);
ConvType = Context.getPointerType(ConvType);
D.setInvalidType();
} else if (ConvType->isFunctionType()) {
Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function);
ConvType = Context.getPointerType(ConvType);
D.setInvalidType();
}
// Rebuild the function type "R" without any parameters (in case any
// of the errors above fired) and with the conversion type as the
// return type.
R = Context.getFunctionType(ConvType, 0, 0, false,
R->getAs<FunctionProtoType>()->getTypeQuals());
// C++0x explicit conversion operators.
if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x)
Diag(D.getDeclSpec().getExplicitSpecLoc(),
diag::warn_explicit_conversion_functions)
<< SourceRange(D.getDeclSpec().getExplicitSpecLoc());
}
/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete
/// the declaration of the given C++ conversion function. This routine
/// is responsible for recording the conversion function in the C++
/// class, if possible.
Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) {
assert(Conversion && "Expected to receive a conversion function declaration");
CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext());
// Make sure we aren't redeclaring the conversion function.
QualType ConvType = Context.getCanonicalType(Conversion->getConversionType());
// C++ [class.conv.fct]p1:
// [...] A conversion function is never used to convert a
// (possibly cv-qualified) object to the (possibly cv-qualified)
// same object type (or a reference to it), to a (possibly
// cv-qualified) base class of that type (or a reference to it),
// or to (possibly cv-qualified) void.
// FIXME: Suppress this warning if the conversion function ends up being a
// virtual function that overrides a virtual function in a base class.
QualType ClassType
= Context.getCanonicalType(Context.getTypeDeclType(ClassDecl));
if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>())
ConvType = ConvTypeRef->getPointeeType();
if (ConvType->isRecordType()) {
ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType();
if (ConvType == ClassType)
Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used)
<< ClassType;
else if (IsDerivedFrom(ClassType, ConvType))
Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used)
<< ClassType << ConvType;
} else if (ConvType->isVoidType()) {
Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used)
<< ClassType << ConvType;
}
if (Conversion->getPreviousDeclaration()) {
const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration();
if (FunctionTemplateDecl *ConversionTemplate
= Conversion->getDescribedFunctionTemplate())
ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration();
if (ClassDecl->replaceConversion(ExpectedPrevDecl, Conversion))
return DeclPtrTy::make(Conversion);
assert(Conversion->isInvalidDecl() && "Conversion should not get here.");
} else if (FunctionTemplateDecl *ConversionTemplate
= Conversion->getDescribedFunctionTemplate())
ClassDecl->addConversionFunction(ConversionTemplate);
else if (!Conversion->getPrimaryTemplate()) // ignore specializations
ClassDecl->addConversionFunction(Conversion);
return DeclPtrTy::make(Conversion);
}
//===----------------------------------------------------------------------===//
// Namespace Handling
//===----------------------------------------------------------------------===//
/// ActOnStartNamespaceDef - This is called at the start of a namespace
/// definition.
Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
SourceLocation IdentLoc,
IdentifierInfo *II,
SourceLocation LBrace) {
NamespaceDecl *Namespc =
NamespaceDecl::Create(Context, CurContext, IdentLoc, II);
Namespc->setLBracLoc(LBrace);
Scope *DeclRegionScope = NamespcScope->getParent();
if (II) {
// C++ [namespace.def]p2:
// The identifier in an original-namespace-definition shall not have been
// previously defined in the declarative region in which the
// original-namespace-definition appears. The identifier in an
// original-namespace-definition is the name of the namespace. Subsequently
// in that declarative region, it is treated as an original-namespace-name.
NamedDecl *PrevDecl
= LookupSingleName(DeclRegionScope, II, LookupOrdinaryName,
ForRedeclaration);
if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) {
// This is an extended namespace definition.
// Attach this namespace decl to the chain of extended namespace
// definitions.
OrigNS->setNextNamespace(Namespc);
Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace());
// Remove the previous declaration from the scope.
if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) {
IdResolver.RemoveDecl(OrigNS);
DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS));
}
} else if (PrevDecl) {
// This is an invalid name redefinition.
Diag(Namespc->getLocation(), diag::err_redefinition_different_kind)
<< Namespc->getDeclName();
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Namespc->setInvalidDecl();
// Continue on to push Namespc as current DeclContext and return it.
} else if (II->isStr("std") &&
CurContext->getLookupContext()->isTranslationUnit()) {
// This is the first "real" definition of the namespace "std", so update
// our cache of the "std" namespace to point at this definition.
if (StdNamespace) {
// We had already defined a dummy namespace "std". Link this new
// namespace definition to the dummy namespace "std".
StdNamespace->setNextNamespace(Namespc);
StdNamespace->setLocation(IdentLoc);
Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace());
}
// Make our StdNamespace cache point at the first real definition of the
// "std" namespace.
StdNamespace = Namespc;
}
PushOnScopeChains(Namespc, DeclRegionScope);
} else {
// Anonymous namespaces.
assert(Namespc->isAnonymousNamespace());
CurContext->addDecl(Namespc);
// Link the anonymous namespace into its parent.
NamespaceDecl *PrevDecl;
DeclContext *Parent = CurContext->getLookupContext();
if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) {
PrevDecl = TU->getAnonymousNamespace();
TU->setAnonymousNamespace(Namespc);
} else {
NamespaceDecl *ND = cast<NamespaceDecl>(Parent);
PrevDecl = ND->getAnonymousNamespace();
ND->setAnonymousNamespace(Namespc);
}
// Link the anonymous namespace with its previous declaration.
if (PrevDecl) {
assert(PrevDecl->isAnonymousNamespace());
assert(!PrevDecl->getNextNamespace());
Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace());
PrevDecl->setNextNamespace(Namespc);
}
// C++ [namespace.unnamed]p1. An unnamed-namespace-definition
// behaves as if it were replaced by
// namespace unique { /* empty body */ }
// using namespace unique;
// namespace unique { namespace-body }
// where all occurrences of 'unique' in a translation unit are
// replaced by the same identifier and this identifier differs
// from all other identifiers in the entire program.
// We just create the namespace with an empty name and then add an
// implicit using declaration, just like the standard suggests.
//
// CodeGen enforces the "universally unique" aspect by giving all
// declarations semantically contained within an anonymous
// namespace internal linkage.
if (!PrevDecl) {
UsingDirectiveDecl* UD
= UsingDirectiveDecl::Create(Context, CurContext,
/* 'using' */ LBrace,
/* 'namespace' */ SourceLocation(),
/* qualifier */ SourceRange(),
/* NNS */ NULL,
/* identifier */ SourceLocation(),
Namespc,
/* Ancestor */ CurContext);
UD->setImplicit();
CurContext->addDecl(UD);
}
}
// Although we could have an invalid decl (i.e. the namespace name is a
// redefinition), push it as current DeclContext and try to continue parsing.
// FIXME: We should be able to push Namespc here, so that the each DeclContext
// for the namespace has the declarations that showed up in that particular
// namespace definition.
PushDeclContext(NamespcScope, Namespc);
return DeclPtrTy::make(Namespc);
}
/// getNamespaceDecl - Returns the namespace a decl represents. If the decl
/// is a namespace alias, returns the namespace it points to.
static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) {
if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D))
return AD->getNamespace();
return dyn_cast_or_null<NamespaceDecl>(D);
}
/// ActOnFinishNamespaceDef - This callback is called after a namespace is
/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef.
void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) {
Decl *Dcl = D.getAs<Decl>();
NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl);
assert(Namespc && "Invalid parameter, expected NamespaceDecl");
Namespc->setRBracLoc(RBrace);
PopDeclContext();
}
Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S,
SourceLocation UsingLoc,
SourceLocation NamespcLoc,
const CXXScopeSpec &SS,
SourceLocation IdentLoc,
IdentifierInfo *NamespcName,
AttributeList *AttrList) {
assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
assert(NamespcName && "Invalid NamespcName.");
assert(IdentLoc.isValid() && "Invalid NamespceName location.");
assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
UsingDirectiveDecl *UDir = 0;
// Lookup namespace name.
LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
LookupParsedName(R, S, &SS);
if (R.isAmbiguous())
return DeclPtrTy();
if (!R.empty()) {
NamedDecl *Named = R.getFoundDecl();
assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named))
&& "expected namespace decl");
// C++ [namespace.udir]p1:
// A using-directive specifies that the names in the nominated
// namespace can be used in the scope in which the
// using-directive appears after the using-directive. During
// unqualified name lookup (3.4.1), the names appear as if they
// were declared in the nearest enclosing namespace which
// contains both the using-directive and the nominated
// namespace. [Note: in this context, "contains" means "contains
// directly or indirectly". ]
// Find enclosing context containing both using-directive and
// nominated namespace.
NamespaceDecl *NS = getNamespaceDecl(Named);
DeclContext *CommonAncestor = cast<DeclContext>(NS);
while (CommonAncestor && !CommonAncestor->Encloses(CurContext))
CommonAncestor = CommonAncestor->getParent();
UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc,
SS.getRange(),
(NestedNameSpecifier *)SS.getScopeRep(),
IdentLoc, Named, CommonAncestor);
PushUsingDirective(S, UDir);
} else {
Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange();
}
// FIXME: We ignore attributes for now.
delete AttrList;
return DeclPtrTy::make(UDir);
}
void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) {
// If scope has associated entity, then using directive is at namespace
// or translation unit scope. We add UsingDirectiveDecls, into
// it's lookup structure.
if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()))
Ctx->addDecl(UDir);
else
// Otherwise it is block-sope. using-directives will affect lookup
// only to the end of scope.
S->PushUsingDirective(DeclPtrTy::make(UDir));
}
Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S,
AccessSpecifier AS,
bool HasUsingKeyword,
SourceLocation UsingLoc,
const CXXScopeSpec &SS,
UnqualifiedId &Name,
AttributeList *AttrList,
bool IsTypeName,
SourceLocation TypenameLoc) {
assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
switch (Name.getKind()) {
case UnqualifiedId::IK_Identifier:
case UnqualifiedId::IK_OperatorFunctionId:
case UnqualifiedId::IK_LiteralOperatorId:
case UnqualifiedId::IK_ConversionFunctionId:
break;
case UnqualifiedId::IK_ConstructorName:
// C++0x inherited constructors.
if (getLangOptions().CPlusPlus0x) break;
Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor)
<< SS.getRange();
return DeclPtrTy();
case UnqualifiedId::IK_DestructorName:
Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor)
<< SS.getRange();
return DeclPtrTy();
case UnqualifiedId::IK_TemplateId:
Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id)
<< SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc);
return DeclPtrTy();
}
DeclarationName TargetName = GetNameFromUnqualifiedId(Name);
if (!TargetName)
return DeclPtrTy();
// Warn about using declarations.
// TODO: store that the declaration was written without 'using' and
// talk about access decls instead of using decls in the
// diagnostics.
if (!HasUsingKeyword) {
UsingLoc = Name.getSourceRange().getBegin();
Diag(UsingLoc, diag::warn_access_decl_deprecated)
<< CodeModificationHint::CreateInsertion(SS.getRange().getBegin(),
"using ");
}
NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS,
Name.getSourceRange().getBegin(),
TargetName, AttrList,
/* IsInstantiation */ false,
IsTypeName, TypenameLoc);
if (UD)
PushOnScopeChains(UD, S, /*AddToContext*/ false);
return DeclPtrTy::make(UD);
}
/// Determines whether to create a using shadow decl for a particular
/// decl, given the set of decls existing prior to this using lookup.
bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig,
const LookupResult &Previous) {
// Diagnose finding a decl which is not from a base class of the
// current class. We do this now because there are cases where this
// function will silently decide not to build a shadow decl, which
// will pre-empt further diagnostics.
//
// We don't need to do this in C++0x because we do the check once on
// the qualifier.
//
// FIXME: diagnose the following if we care enough:
// struct A { int foo; };
// struct B : A { using A::foo; };
// template <class T> struct C : A {};
// template <class T> struct D : C<T> { using B::foo; } // <---
// This is invalid (during instantiation) in C++03 because B::foo
// resolves to the using decl in B, which is not a base class of D<T>.
// We can't diagnose it immediately because C<T> is an unknown
// specialization. The UsingShadowDecl in D<T> then points directly
// to A::foo, which will look well-formed when we instantiate.
// The right solution is to not collapse the shadow-decl chain.
if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) {
DeclContext *OrigDC = Orig->getDeclContext();
// Handle enums and anonymous structs.
if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent();
CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC);
while (OrigRec->isAnonymousStructOrUnion())
OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext());
if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) {
if (OrigDC == CurContext) {
Diag(Using->getLocation(),
diag::err_using_decl_nested_name_specifier_is_current_class)
<< Using->getNestedNameRange();
Diag(Orig->getLocation(), diag::note_using_decl_target);
return true;
}
Diag(Using->getNestedNameRange().getBegin(),
diag::err_using_decl_nested_name_specifier_is_not_base_class)
<< Using->getTargetNestedNameDecl()
<< cast<CXXRecordDecl>(CurContext)
<< Using->getNestedNameRange();
Diag(Orig->getLocation(), diag::note_using_decl_target);
return true;
}
}
if (Previous.empty()) return false;
NamedDecl *Target = Orig;
if (isa<UsingShadowDecl>(Target))
Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
// If the target happens to be one of the previous declarations, we
// don't have a conflict.
//
// FIXME: but we might be increasing its access, in which case we
// should redeclare it.
NamedDecl *NonTag = 0, *Tag = 0;
for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
I != E; ++I) {
NamedDecl *D = (*I)->getUnderlyingDecl();
if (D->getCanonicalDecl() == Target->getCanonicalDecl())
return false;
(isa<TagDecl>(D) ? Tag : NonTag) = D;
}
if (Target->isFunctionOrFunctionTemplate()) {
FunctionDecl *FD;
if (isa<FunctionTemplateDecl>(Target))
FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl();
else
FD = cast<FunctionDecl>(Target);
NamedDecl *OldDecl = 0;
switch (CheckOverload(FD, Previous, OldDecl)) {
case Ovl_Overload:
return false;
case Ovl_NonFunction:
Diag(Using->getLocation(), diag::err_using_decl_conflict);
break;
// We found a decl with the exact signature.
case Ovl_Match:
if (isa<UsingShadowDecl>(OldDecl)) {
// Silently ignore the possible conflict.
return false;
}
// If we're in a record, we want to hide the target, so we
// return true (without a diagnostic) to tell the caller not to
// build a shadow decl.
if (CurContext->isRecord())
return true;
// If we're not in a record, this is an error.
Diag(Using->getLocation(), diag::err_using_decl_conflict);
break;
}
Diag(Target->getLocation(), diag::note_using_decl_target);
Diag(OldDecl->getLocation(), diag::note_using_decl_conflict);
return true;
}
// Target is not a function.
if (isa<TagDecl>(Target)) {
// No conflict between a tag and a non-tag.
if (!Tag) return false;
Diag(Using->getLocation(), diag::err_using_decl_conflict);
Diag(Target->getLocation(), diag::note_using_decl_target);
Diag(Tag->getLocation(), diag::note_using_decl_conflict);
return true;
}
// No conflict between a tag and a non-tag.
if (!NonTag) return false;
Diag(Using->getLocation(), diag::err_using_decl_conflict);
Diag(Target->getLocation(), diag::note_using_decl_target);
Diag(NonTag->getLocation(), diag::note_using_decl_conflict);
return true;
}
/// Builds a shadow declaration corresponding to a 'using' declaration.
UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S,
UsingDecl *UD,
NamedDecl *Orig) {
// If we resolved to another shadow declaration, just coalesce them.
NamedDecl *Target = Orig;
if (isa<UsingShadowDecl>(Target)) {
Target = cast<UsingShadowDecl>(Target)->getTargetDecl();
assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration");
}
UsingShadowDecl *Shadow
= UsingShadowDecl::Create(Context, CurContext,
UD->getLocation(), UD, Target);
UD->addShadowDecl(Shadow);
if (S)
PushOnScopeChains(Shadow, S);
else
CurContext->addDecl(Shadow);
Shadow->setAccess(UD->getAccess());
if (Orig->isInvalidDecl() || UD->isInvalidDecl())
Shadow->setInvalidDecl();
return Shadow;
}
/// Hides a using shadow declaration. This is required by the current
/// using-decl implementation when a resolvable using declaration in a
/// class is followed by a declaration which would hide or override
/// one or more of the using decl's targets; for example:
///
/// struct Base { void foo(int); };
/// struct Derived : Base {
/// using Base::foo;
/// void foo(int);
/// };
///
/// The governing language is C++03 [namespace.udecl]p12:
///
/// When a using-declaration brings names from a base class into a
/// derived class scope, member functions in the derived class
/// override and/or hide member functions with the same name and
/// parameter types in a base class (rather than conflicting).
///
/// There are two ways to implement this:
/// (1) optimistically create shadow decls when they're not hidden
/// by existing declarations, or
/// (2) don't create any shadow decls (or at least don't make them
/// visible) until we've fully parsed/instantiated the class.
/// The problem with (1) is that we might have to retroactively remove
/// a shadow decl, which requires several O(n) operations because the
/// decl structures are (very reasonably) not designed for removal.
/// (2) avoids this but is very fiddly and phase-dependent.
void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) {
// Remove it from the DeclContext...
Shadow->getDeclContext()->removeDecl(Shadow);
// ...and the scope, if applicable...
if (S) {
S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow)));
IdResolver.RemoveDecl(Shadow);
}
// ...and the using decl.
Shadow->getUsingDecl()->removeShadowDecl(Shadow);
// TODO: complain somehow if Shadow was used. It shouldn't
// be possible for this to happen, because
}
/// Builds a using declaration.
///
/// \param IsInstantiation - Whether this call arises from an
/// instantiation of an unresolved using declaration. We treat
/// the lookup differently for these declarations.
NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
SourceLocation UsingLoc,
const CXXScopeSpec &SS,
SourceLocation IdentLoc,
DeclarationName Name,
AttributeList *AttrList,
bool IsInstantiation,
bool IsTypeName,
SourceLocation TypenameLoc) {
assert(!SS.isInvalid() && "Invalid CXXScopeSpec.");
assert(IdentLoc.isValid() && "Invalid TargetName location.");
// FIXME: We ignore attributes for now.
delete AttrList;
if (SS.isEmpty()) {
Diag(IdentLoc, diag::err_using_requires_qualname);
return 0;
}
// Do the redeclaration lookup in the current scope.
LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName,
ForRedeclaration);
Previous.setHideTags(false);
if (S) {
LookupName(Previous, S);
// It is really dumb that we have to do this.
LookupResult::Filter F = Previous.makeFilter();
while (F.hasNext()) {
NamedDecl *D = F.next();
if (!isDeclInScope(D, CurContext, S))
F.erase();
}
F.done();
} else {
assert(IsInstantiation && "no scope in non-instantiation");
assert(CurContext->isRecord() && "scope not record in instantiation");
LookupQualifiedName(Previous, CurContext);
}
NestedNameSpecifier *NNS =
static_cast<NestedNameSpecifier *>(SS.getScopeRep());
// Check for invalid redeclarations.
if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous))
return 0;
// Check for bad qualifiers.
if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc))
return 0;
DeclContext *LookupContext = computeDeclContext(SS);
NamedDecl *D;
if (!LookupContext) {
if (IsTypeName) {
// FIXME: not all declaration name kinds are legal here
D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
UsingLoc, TypenameLoc,
SS.getRange(), NNS,
IdentLoc, Name);
} else {
D = UnresolvedUsingValueDecl::Create(Context, CurContext,
UsingLoc, SS.getRange(), NNS,
IdentLoc, Name);
}
} else {
D = UsingDecl::Create(Context, CurContext, IdentLoc,
SS.getRange(), UsingLoc, NNS, Name,
IsTypeName);
}
D->setAccess(AS);
CurContext->addDecl(D);
if (!LookupContext) return D;
UsingDecl *UD = cast<UsingDecl>(D);
if (RequireCompleteDeclContext(SS)) {
UD->setInvalidDecl();
return UD;
}
// Look up the target name.
LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName);
// Unlike most lookups, we don't always want to hide tag
// declarations: tag names are visible through the using declaration
// even if hidden by ordinary names, *except* in a dependent context
// where it's important for the sanity of two-phase lookup.
if (!IsInstantiation)
R.setHideTags(false);
LookupQualifiedName(R, LookupContext);
if (R.empty()) {
Diag(IdentLoc, diag::err_no_member)
<< Name << LookupContext << SS.getRange();
UD->setInvalidDecl();
return UD;
}
if (R.isAmbiguous()) {
UD->setInvalidDecl();
return UD;
}
if (IsTypeName) {
// If we asked for a typename and got a non-type decl, error out.
if (!R.getAsSingle<TypeDecl>()) {
Diag(IdentLoc, diag::err_using_typename_non_type);
for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
Diag((*I)->getUnderlyingDecl()->getLocation(),
diag::note_using_decl_target);
UD->setInvalidDecl();
return UD;
}
} else {
// If we asked for a non-typename and we got a type, error out,
// but only if this is an instantiation of an unresolved using
// decl. Otherwise just silently find the type name.
if (IsInstantiation && R.getAsSingle<TypeDecl>()) {
Diag(IdentLoc, diag::err_using_dependent_value_is_type);
Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target);
UD->setInvalidDecl();
return UD;
}
}
// C++0x N2914 [namespace.udecl]p6:
// A using-declaration shall not name a namespace.
if (R.getAsSingle<NamespaceDecl>()) {
Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace)
<< SS.getRange();
UD->setInvalidDecl();
return UD;
}
for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
if (!CheckUsingShadowDecl(UD, *I, Previous))
BuildUsingShadowDecl(S, UD, *I);
}
return UD;
}
/// Checks that the given using declaration is not an invalid
/// redeclaration. Note that this is checking only for the using decl
/// itself, not for any ill-formedness among the UsingShadowDecls.
bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
bool isTypeName,
const CXXScopeSpec &SS,
SourceLocation NameLoc,
const LookupResult &Prev) {
// C++03 [namespace.udecl]p8:
// C++0x [namespace.udecl]p10:
// A using-declaration is a declaration and can therefore be used
// repeatedly where (and only where) multiple declarations are
// allowed.
// That's only in file contexts.
if (CurContext->getLookupContext()->isFileContext())
return false;
NestedNameSpecifier *Qual
= static_cast<NestedNameSpecifier*>(SS.getScopeRep());
for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) {
NamedDecl *D = *I;
bool DTypename;
NestedNameSpecifier *DQual;
if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) {
DTypename = UD->isTypeName();
DQual = UD->getTargetNestedNameDecl();
} else if (UnresolvedUsingValueDecl *UD
= dyn_cast<UnresolvedUsingValueDecl>(D)) {
DTypename = false;
DQual = UD->getTargetNestedNameSpecifier();
} else if (UnresolvedUsingTypenameDecl *UD
= dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
DTypename = true;
DQual = UD->getTargetNestedNameSpecifier();
} else continue;
// using decls differ if one says 'typename' and the other doesn't.
// FIXME: non-dependent using decls?
if (isTypeName != DTypename) continue;
// using decls differ if they name different scopes (but note that
// template instantiation can cause this check to trigger when it
// didn't before instantiation).
if (Context.getCanonicalNestedNameSpecifier(Qual) !=
Context.getCanonicalNestedNameSpecifier(DQual))
continue;
Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange();
Diag(D->getLocation(), diag::note_using_decl) << 1;
return true;
}
return false;
}
/// Checks that the given nested-name qualifier used in a using decl
/// in the current context is appropriately related to the current
/// scope. If an error is found, diagnoses it and returns true.
bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
const CXXScopeSpec &SS,
SourceLocation NameLoc) {
DeclContext *NamedContext = computeDeclContext(SS);
if (!CurContext->isRecord()) {
// C++03 [namespace.udecl]p3:
// C++0x [namespace.udecl]p8:
// A using-declaration for a class member shall be a member-declaration.
// If we weren't able to compute a valid scope, it must be a
// dependent class scope.
if (!NamedContext || NamedContext->isRecord()) {
Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
<< SS.getRange();
return true;
}
// Otherwise, everything is known to be fine.
return false;
}
// The current scope is a record.
// If the named context is dependent, we can't decide much.
if (!NamedContext) {
// FIXME: in C++0x, we can diagnose if we can prove that the
// nested-name-specifier does not refer to a base class, which is
// still possible in some cases.
// Otherwise we have to conservatively report that things might be
// okay.
return false;
}
if (!NamedContext->isRecord()) {
// Ideally this would point at the last name in the specifier,
// but we don't have that level of source info.
Diag(SS.getRange().getBegin(),
diag::err_using_decl_nested_name_specifier_is_not_class)
<< (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange();
return true;
}
if (getLangOptions().CPlusPlus0x) {
// C++0x [namespace.udecl]p3:
// In a using-declaration used as a member-declaration, the
// nested-name-specifier shall name a base class of the class
// being defined.
if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
cast<CXXRecordDecl>(NamedContext))) {
if (CurContext == NamedContext) {
Diag(NameLoc,
diag::err_using_decl_nested_name_specifier_is_current_class)
<< SS.getRange();
return true;
}
Diag(SS.getRange().getBegin(),
diag::err_using_decl_nested_name_specifier_is_not_base_class)
<< (NestedNameSpecifier*) SS.getScopeRep()
<< cast<CXXRecordDecl>(CurContext)
<< SS.getRange();
return true;
}
return false;
}
// C++03 [namespace.udecl]p4:
// A using-declaration used as a member-declaration shall refer
// to a member of a base class of the class being defined [etc.].
// Salient point: SS doesn't have to name a base class as long as
// lookup only finds members from base classes. Therefore we can
// diagnose here only if we can prove that that can't happen,
// i.e. if the class hierarchies provably don't intersect.
// TODO: it would be nice if "definitely valid" results were cached
// in the UsingDecl and UsingShadowDecl so that these checks didn't
// need to be repeated.
struct UserData {
llvm::DenseSet<const CXXRecordDecl*> Bases;
static bool collect(const CXXRecordDecl *Base, void *OpaqueData) {
UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
Data->Bases.insert(Base);
return true;
}
bool hasDependentBases(const CXXRecordDecl *Class) {
return !Class->forallBases(collect, this);
}
/// Returns true if the base is dependent or is one of the
/// accumulated base classes.
static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) {
UserData *Data = reinterpret_cast<UserData*>(OpaqueData);
return !Data->Bases.count(Base);
}
bool mightShareBases(const CXXRecordDecl *Class) {
return Bases.count(Class) || !Class->forallBases(doesNotContain, this);
}
};
UserData Data;
// Returns false if we find a dependent base.
if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext)))
return false;
// Returns false if the class has a dependent base or if it or one
// of its bases is present in the base set of the current context.
if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext)))
return false;
Diag(SS.getRange().getBegin(),
diag::err_using_decl_nested_name_specifier_is_not_base_class)
<< (NestedNameSpecifier*) SS.getScopeRep()
<< cast<CXXRecordDecl>(CurContext)
<< SS.getRange();
return true;
}
Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S,
SourceLocation NamespaceLoc,
SourceLocation AliasLoc,
IdentifierInfo *Alias,
const CXXScopeSpec &SS,
SourceLocation IdentLoc,
IdentifierInfo *Ident) {
// Lookup the namespace name.
LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName);
LookupParsedName(R, S, &SS);
// Check if we have a previous declaration with the same name.
if (NamedDecl *PrevDecl
= LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) {
if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) {
// We already have an alias with the same name that points to the same
// namespace, so don't create a new one.
if (!R.isAmbiguous() && !R.empty() &&
AD->getNamespace() == getNamespaceDecl(R.getFoundDecl()))
return DeclPtrTy();
}
unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition :
diag::err_redefinition_different_kind;
Diag(AliasLoc, DiagID) << Alias;
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
return DeclPtrTy();
}
if (R.isAmbiguous())
return DeclPtrTy();
if (R.empty()) {
Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange();
return DeclPtrTy();
}
NamespaceAliasDecl *AliasDecl =
NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc,
Alias, SS.getRange(),
(NestedNameSpecifier *)SS.getScopeRep(),
IdentLoc, R.getFoundDecl());
CurContext->addDecl(AliasDecl);
return DeclPtrTy::make(AliasDecl);
}
void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
CXXConstructorDecl *Constructor) {
assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() &&
!Constructor->isUsed()) &&
"DefineImplicitDefaultConstructor - call it for implicit default ctor");
CXXRecordDecl *ClassDecl
= cast<CXXRecordDecl>(Constructor->getDeclContext());
assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) {
Diag(CurrentLocation, diag::note_member_synthesized_at)
<< CXXDefaultConstructor << Context.getTagDeclType(ClassDecl);
Constructor->setInvalidDecl();
} else {
Constructor->setUsed();
}
}
void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation,
CXXDestructorDecl *Destructor) {
assert((Destructor->isImplicit() && !Destructor->isUsed()) &&
"DefineImplicitDestructor - call it for implicit default dtor");
CXXRecordDecl *ClassDecl = Destructor->getParent();
assert(ClassDecl && "DefineImplicitDestructor - invalid destructor");
// C++ [class.dtor] p5
// Before the implicitly-declared default destructor for a class is
// implicitly defined, all the implicitly-declared default destructors
// for its base class and its non-static data members shall have been
// implicitly defined.
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
E = ClassDecl->bases_end(); Base != E; ++Base) {
CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
if (!BaseClassDecl->hasTrivialDestructor()) {
if (CXXDestructorDecl *BaseDtor =
const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context)))
MarkDeclarationReferenced(CurrentLocation, BaseDtor);
else
assert(false &&
"DefineImplicitDestructor - missing dtor in a base class");
}
}
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
E = ClassDecl->field_end(); Field != E; ++Field) {
QualType FieldType = Context.getCanonicalType((*Field)->getType());
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
if (!FieldClassDecl->hasTrivialDestructor()) {
if (CXXDestructorDecl *FieldDtor =
const_cast<CXXDestructorDecl*>(
FieldClassDecl->getDestructor(Context)))
MarkDeclarationReferenced(CurrentLocation, FieldDtor);
else
assert(false &&
"DefineImplicitDestructor - missing dtor in class of a data member");
}
}
}
// FIXME: If CheckDestructor fails, we should emit a note about where the
// implicit destructor was needed.
if (CheckDestructor(Destructor)) {
Diag(CurrentLocation, diag::note_member_synthesized_at)
<< CXXDestructor << Context.getTagDeclType(ClassDecl);
Destructor->setInvalidDecl();
return;
}
Destructor->setUsed();
}
void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation,
CXXMethodDecl *MethodDecl) {
assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() &&
MethodDecl->getOverloadedOperator() == OO_Equal &&
!MethodDecl->isUsed()) &&
"DefineImplicitOverloadedAssign - call it for implicit assignment op");
CXXRecordDecl *ClassDecl
= cast<CXXRecordDecl>(MethodDecl->getDeclContext());
// C++[class.copy] p12
// Before the implicitly-declared copy assignment operator for a class is
// implicitly defined, all implicitly-declared copy assignment operators
// for its direct base classes and its nonstatic data members shall have
// been implicitly defined.
bool err = false;
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(),
E = ClassDecl->bases_end(); Base != E; ++Base) {
CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
if (CXXMethodDecl *BaseAssignOpMethod =
getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0),
BaseClassDecl))
MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod);
}
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
E = ClassDecl->field_end(); Field != E; ++Field) {
QualType FieldType = Context.getCanonicalType((*Field)->getType());
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
if (CXXMethodDecl *FieldAssignOpMethod =
getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0),
FieldClassDecl))
MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod);
} else if (FieldType->isReferenceType()) {
Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
<< Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName();
Diag(Field->getLocation(), diag::note_declared_at);
Diag(CurrentLocation, diag::note_first_required_here);
err = true;
} else if (FieldType.isConstQualified()) {
Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign)
<< Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName();
Diag(Field->getLocation(), diag::note_declared_at);
Diag(CurrentLocation, diag::note_first_required_here);
err = true;
}
}
if (!err)
MethodDecl->setUsed();
}
CXXMethodDecl *
Sema::getAssignOperatorMethod(SourceLocation CurrentLocation,
ParmVarDecl *ParmDecl,
CXXRecordDecl *ClassDecl) {
QualType LHSType = Context.getTypeDeclType(ClassDecl);
QualType RHSType(LHSType);
// If class's assignment operator argument is const/volatile qualified,
// look for operator = (const/volatile B&). Otherwise, look for
// operator = (B&).
RHSType = Context.getCVRQualifiedType(RHSType,
ParmDecl->getType().getCVRQualifiers());
ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl,
LHSType,
SourceLocation()));
ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl,
RHSType,
CurrentLocation));
Expr *Args[2] = { &*LHS, &*RHS };
OverloadCandidateSet CandidateSet;
AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2,
CandidateSet);
OverloadCandidateSet::iterator Best;
if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success)
return cast<CXXMethodDecl>(Best->Function);
assert(false &&
"getAssignOperatorMethod - copy assignment operator method not found");
return 0;
}
void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
CXXConstructorDecl *CopyConstructor,
unsigned TypeQuals) {
assert((CopyConstructor->isImplicit() &&
CopyConstructor->isCopyConstructor(TypeQuals) &&
!CopyConstructor->isUsed()) &&
"DefineImplicitCopyConstructor - call it for implicit copy ctor");
CXXRecordDecl *ClassDecl
= cast<CXXRecordDecl>(CopyConstructor->getDeclContext());
assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor");
// C++ [class.copy] p209
// Before the implicitly-declared copy constructor for a class is
// implicitly defined, all the implicitly-declared copy constructors
// for its base class and its non-static data members shall have been
// implicitly defined.
for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin();
Base != ClassDecl->bases_end(); ++Base) {
CXXRecordDecl *BaseClassDecl
= cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
if (CXXConstructorDecl *BaseCopyCtor =
BaseClassDecl->getCopyConstructor(Context, TypeQuals))
MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor);
}
for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
FieldEnd = ClassDecl->field_end();
Field != FieldEnd; ++Field) {
QualType FieldType = Context.getCanonicalType((*Field)->getType());
if (const ArrayType *Array = Context.getAsArrayType(FieldType))
FieldType = Array->getElementType();
if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) {
CXXRecordDecl *FieldClassDecl
= cast<CXXRecordDecl>(FieldClassType->getDecl());
if (CXXConstructorDecl *FieldCopyCtor =
FieldClassDecl->getCopyConstructor(Context, TypeQuals))
MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor);
}
}
CopyConstructor->setUsed();
}
Sema::OwningExprResult
Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
CXXConstructorDecl *Constructor,
MultiExprArg ExprArgs,
bool RequiresZeroInit) {
bool Elidable = false;
// C++ [class.copy]p15:
// Whenever a temporary class object is copied using a copy constructor, and
// this object and the copy have the same cv-unqualified type, an
// implementation is permitted to treat the original and the copy as two
// different ways of referring to the same object and not perform a copy at
// all, even if the class copy constructor or destructor have side effects.
// FIXME: Is this enough?
if (Constructor->isCopyConstructor()) {
Expr *E = ((Expr **)ExprArgs.get())[0];
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
if (ICE->getCastKind() == CastExpr::CK_NoOp)
E = ICE->getSubExpr();
while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E))
E = BE->getSubExpr();
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
if (ICE->getCastKind() == CastExpr::CK_NoOp)
E = ICE->getSubExpr();
if (CallExpr *CE = dyn_cast<CallExpr>(E))
Elidable = !CE->getCallReturnType()->isReferenceType();
else if (isa<CXXTemporaryObjectExpr>(E))
Elidable = true;
}
return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor,
Elidable, move(ExprArgs), RequiresZeroInit);
}
/// BuildCXXConstructExpr - Creates a complete call to a constructor,
/// including handling of its default argument expressions.
Sema::OwningExprResult
Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
CXXConstructorDecl *Constructor, bool Elidable,
MultiExprArg ExprArgs,
bool RequiresZeroInit) {
unsigned NumExprs = ExprArgs.size();
Expr **Exprs = (Expr **)ExprArgs.release();
MarkDeclarationReferenced(ConstructLoc, Constructor);
return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc,
Constructor, Elidable, Exprs, NumExprs,
RequiresZeroInit));
}
Sema::OwningExprResult
Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor,
QualType Ty,
SourceLocation TyBeginLoc,
MultiExprArg Args,
SourceLocation RParenLoc) {
unsigned NumExprs = Args.size();
Expr **Exprs = (Expr **)Args.release();
MarkDeclarationReferenced(TyBeginLoc, Constructor);
return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty,
TyBeginLoc, Exprs,
NumExprs, RParenLoc));
}
bool Sema::InitializeVarWithConstructor(VarDecl *VD,
CXXConstructorDecl *Constructor,
MultiExprArg Exprs) {
OwningExprResult TempResult =
BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor,
move(Exprs));
if (TempResult.isInvalid())
return true;
Expr *Temp = TempResult.takeAs<Expr>();
MarkDeclarationReferenced(VD->getLocation(), Constructor);
Temp = MaybeCreateCXXExprWithTemporaries(Temp);
VD->setInit(Context, Temp);
return false;
}
void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) {
CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(
DeclInitType->getAs<RecordType>()->getDecl());
if (!ClassDecl->hasTrivialDestructor())
if (CXXDestructorDecl *Destructor =
const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context)))
MarkDeclarationReferenced(VD->getLocation(), Destructor);
}
/// AddCXXDirectInitializerToDecl - This action is called immediately after
/// ActOnDeclarator, when a C++ direct initializer is present.
/// e.g: "int x(1);"
void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl,
SourceLocation LParenLoc,
MultiExprArg Exprs,
SourceLocation *CommaLocs,
SourceLocation RParenLoc) {
unsigned NumExprs = Exprs.size();
assert(NumExprs != 0 && Exprs.get() && "missing expressions");
Decl *RealDecl = Dcl.getAs<Decl>();
// If there is no declaration, there was an error parsing it. Just ignore
// the initializer.
if (RealDecl == 0)
return;
VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
if (!VDecl) {
Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
RealDecl->setInvalidDecl();
return;
}
// We will represent direct-initialization similarly to copy-initialization:
// int x(1); -as-> int x = 1;
// ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
//
// Clients that want to distinguish between the two forms, can check for
// direct initializer using VarDecl::hasCXXDirectInitializer().
// A major benefit is that clients that don't particularly care about which
// exactly form was it (like the CodeGen) can handle both cases without
// special case code.
// If either the declaration has a dependent type or if any of the expressions
// is type-dependent, we represent the initialization via a ParenListExpr for
// later use during template instantiation.
if (VDecl->getType()->isDependentType() ||
Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) {
// Let clients know that initialization was done with a direct initializer.
VDecl->setCXXDirectInitializer(true);
// Store the initialization expressions as a ParenListExpr.
unsigned NumExprs = Exprs.size();
VDecl->setInit(Context,
new (Context) ParenListExpr(Context, LParenLoc,
(Expr **)Exprs.release(),
NumExprs, RParenLoc));
return;
}
// C++ 8.5p11:
// The form of initialization (using parentheses or '=') is generally
// insignificant, but does matter when the entity being initialized has a
// class type.
QualType DeclInitType = VDecl->getType();
if (const ArrayType *Array = Context.getAsArrayType(DeclInitType))
DeclInitType = Context.getBaseElementType(Array);
if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(),
diag::err_typecheck_decl_incomplete_type)) {
VDecl->setInvalidDecl();
return;
}
// The variable can not have an abstract class type.
if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
diag::err_abstract_type_in_decl,
AbstractVariableType))
VDecl->setInvalidDecl();
const VarDecl *Def = 0;
if (VDecl->getDefinition(Def)) {
Diag(VDecl->getLocation(), diag::err_redefinition)
<< VDecl->getDeclName();
Diag(Def->getLocation(), diag::note_previous_definition);
VDecl->setInvalidDecl();
return;
}
// Capture the variable that is being initialized and the style of
// initialization.
InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
// FIXME: Poor source location information.
InitializationKind Kind
= InitializationKind::CreateDirect(VDecl->getLocation(),
LParenLoc, RParenLoc);
InitializationSequence InitSeq(*this, Entity, Kind,
(Expr**)Exprs.get(), Exprs.size());
OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs));
if (Result.isInvalid()) {
VDecl->setInvalidDecl();
return;
}
Result = MaybeCreateCXXExprWithTemporaries(move(Result));
VDecl->setInit(Context, Result.takeAs<Expr>());
VDecl->setCXXDirectInitializer(true);
if (VDecl->getType()->getAs<RecordType>())
FinalizeVarWithDestructor(VDecl, DeclInitType);
}
/// \brief Add the applicable constructor candidates for an initialization
/// by constructor.
static void AddConstructorInitializationCandidates(Sema &SemaRef,
QualType ClassType,
Expr **Args,
unsigned NumArgs,
InitializationKind Kind,
OverloadCandidateSet &CandidateSet) {
// C++ [dcl.init]p14:
// If the initialization is direct-initialization, or if it is
// copy-initialization where the cv-unqualified version of the
// source type is the same class as, or a derived class of, the
// class of the destination, constructors are considered. The
// applicable constructors are enumerated (13.3.1.3), and the
// best one is chosen through overload resolution (13.3). The
// constructor so selected is called to initialize the object,
// with the initializer expression(s) as its argument(s). If no
// constructor applies, or the overload resolution is ambiguous,
// the initialization is ill-formed.
const RecordType *ClassRec = ClassType->getAs<RecordType>();
assert(ClassRec && "Can only initialize a class type here");
// FIXME: When we decide not to synthesize the implicitly-declared
// constructors, we'll need to make them appear here.
const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl());
DeclarationName ConstructorName
= SemaRef.Context.DeclarationNames.getCXXConstructorName(
SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType());
DeclContext::lookup_const_iterator Con, ConEnd;
for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName);
Con != ConEnd; ++Con) {
// Find the constructor (which may be a template).
CXXConstructorDecl *Constructor = 0;
FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con);
if (ConstructorTmpl)
Constructor
= cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl());
else
Constructor = cast<CXXConstructorDecl>(*Con);
if ((Kind.getKind() == InitializationKind::IK_Direct) ||
(Kind.getKind() == InitializationKind::IK_Value) ||
(Kind.getKind() == InitializationKind::IK_Copy &&
Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) ||
((Kind.getKind() == InitializationKind::IK_Default) &&
Constructor->isDefaultConstructor())) {
if (ConstructorTmpl)
SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl,
/*ExplicitArgs*/ 0,
Args, NumArgs, CandidateSet);
else
SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet);
}
}
}
/// \brief Attempt to perform initialization by constructor
/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or
/// copy-initialization.
///
/// This routine determines whether initialization by constructor is possible,
/// but it does not emit any diagnostics in the case where the initialization
/// is ill-formed.
///
/// \param ClassType the type of the object being initialized, which must have
/// class type.
///
/// \param Args the arguments provided to initialize the object
///
/// \param NumArgs the number of arguments provided to initialize the object
///
/// \param Kind the type of initialization being performed
///
/// \returns the constructor used to initialize the object, if successful.
/// Otherwise, emits a diagnostic and returns NULL.
CXXConstructorDecl *
Sema::TryInitializationByConstructor(QualType ClassType,
Expr **Args, unsigned NumArgs,
SourceLocation Loc,
InitializationKind Kind) {
// Build the overload candidate set
OverloadCandidateSet CandidateSet;
AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind,
CandidateSet);
// Determine whether we found a constructor we can use.
OverloadCandidateSet::iterator Best;
switch (BestViableFunction(CandidateSet, Loc, Best)) {
case OR_Success:
case OR_Deleted:
// We found a constructor. Return it.
return cast<CXXConstructorDecl>(Best->Function);
case OR_No_Viable_Function:
case OR_Ambiguous:
// Overload resolution failed. Return nothing.
return 0;
}
// Silence GCC warning
return 0;
}
/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which
/// may occur as part of direct-initialization or copy-initialization.
///
/// \param ClassType the type of the object being initialized, which must have
/// class type.
///
/// \param ArgsPtr the arguments provided to initialize the object
///
/// \param Loc the source location where the initialization occurs
///
/// \param Range the source range that covers the entire initialization
///
/// \param InitEntity the name of the entity being initialized, if known
///
/// \param Kind the type of initialization being performed
///
/// \param ConvertedArgs a vector that will be filled in with the
/// appropriately-converted arguments to the constructor (if initialization
/// succeeded).
///
/// \returns the constructor used to initialize the object, if successful.
/// Otherwise, emits a diagnostic and returns NULL.
CXXConstructorDecl *
Sema::PerformInitializationByConstructor(QualType ClassType,
MultiExprArg ArgsPtr,
SourceLocation Loc, SourceRange Range,
DeclarationName InitEntity,
InitializationKind Kind,
ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) {
// Build the overload candidate set
Expr **Args = (Expr **)ArgsPtr.get();
unsigned NumArgs = ArgsPtr.size();
OverloadCandidateSet CandidateSet;
AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind,
CandidateSet);
OverloadCandidateSet::iterator Best;
switch (BestViableFunction(CandidateSet, Loc, Best)) {
case OR_Success:
// We found a constructor. Break out so that we can convert the arguments
// appropriately.
break;
case OR_No_Viable_Function:
if (InitEntity)
Diag(Loc, diag::err_ovl_no_viable_function_in_init)
<< InitEntity << Range;
else
Diag(Loc, diag::err_ovl_no_viable_function_in_init)
<< ClassType << Range;
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
return 0;
case OR_Ambiguous:
if (InitEntity)
Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range;
else
Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range;
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
return 0;
case OR_Deleted:
if (InitEntity)
Diag(Loc, diag::err_ovl_deleted_init)
<< Best->Function->isDeleted()
<< InitEntity << Range;
else {
const CXXRecordDecl *RD =
cast<CXXRecordDecl>(ClassType->getAs<RecordType>()->getDecl());
Diag(Loc, diag::err_ovl_deleted_init)
<< Best->Function->isDeleted()
<< RD->getDeclName() << Range;
}
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
return 0;
}
// Convert the arguments, fill in default arguments, etc.
CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function);
if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs))
return 0;
return Constructor;
}
/// \brief Given a constructor and the set of arguments provided for the
/// constructor, convert the arguments and add any required default arguments
/// to form a proper call to this constructor.
///
/// \returns true if an error occurred, false otherwise.
bool
Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor,
MultiExprArg ArgsPtr,
SourceLocation Loc,
ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) {
// FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall.
unsigned NumArgs = ArgsPtr.size();
Expr **Args = (Expr **)ArgsPtr.get();
const FunctionProtoType *Proto
= Constructor->getType()->getAs<FunctionProtoType>();
assert(Proto && "Constructor without a prototype?");
unsigned NumArgsInProto = Proto->getNumArgs();
// If too few arguments are available, we'll fill in the rest with defaults.
if (NumArgs < NumArgsInProto)
ConvertedArgs.reserve(NumArgsInProto);
else
ConvertedArgs.reserve(NumArgs);
VariadicCallType CallType =
Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
llvm::SmallVector<Expr *, 8> AllArgs;
bool Invalid = GatherArgumentsForCall(Loc, Constructor,
Proto, 0, Args, NumArgs, AllArgs,
CallType);
for (unsigned i =0, size = AllArgs.size(); i < size; i++)
ConvertedArgs.push_back(AllArgs[i]);
return Invalid;
}
/// CompareReferenceRelationship - Compare the two types T1 and T2 to
/// determine whether they are reference-related,
/// reference-compatible, reference-compatible with added
/// qualification, or incompatible, for use in C++ initialization by
/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference
/// type, and the first type (T1) is the pointee type of the reference
/// type being initialized.
Sema::ReferenceCompareResult
Sema::CompareReferenceRelationship(SourceLocation Loc,
QualType OrigT1, QualType OrigT2,
bool& DerivedToBase) {
assert(!OrigT1->isReferenceType() &&
"T1 must be the pointee type of the reference type");
assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type");
QualType T1 = Context.getCanonicalType(OrigT1);
QualType T2 = Context.getCanonicalType(OrigT2);
QualType UnqualT1 = T1.getLocalUnqualifiedType();
QualType UnqualT2 = T2.getLocalUnqualifiedType();
// C++ [dcl.init.ref]p4:
// Given types "cv1 T1" and "cv2 T2," "cv1 T1" is
// reference-related to "cv2 T2" if T1 is the same type as T2, or
// T1 is a base class of T2.
if (UnqualT1 == UnqualT2)
DerivedToBase = false;
else if (!RequireCompleteType(Loc, OrigT1, PDiag()) &&
!RequireCompleteType(Loc, OrigT2, PDiag()) &&
IsDerivedFrom(UnqualT2, UnqualT1))
DerivedToBase = true;
else
return Ref_Incompatible;
// At this point, we know that T1 and T2 are reference-related (at
// least).
// C++ [dcl.init.ref]p4:
// "cv1 T1" is reference-compatible with "cv2 T2" if T1 is
// reference-related to T2 and cv1 is the same cv-qualification
// as, or greater cv-qualification than, cv2. For purposes of
// overload resolution, cases for which cv1 is greater
// cv-qualification than cv2 are identified as
// reference-compatible with added qualification (see 13.3.3.2).
if (T1.getCVRQualifiers() == T2.getCVRQualifiers())
return Ref_Compatible;
else if (T1.isMoreQualifiedThan(T2))
return Ref_Compatible_With_Added_Qualification;
else
return Ref_Related;
}
/// CheckReferenceInit - Check the initialization of a reference
/// variable with the given initializer (C++ [dcl.init.ref]). Init is
/// the initializer (either a simple initializer or an initializer
/// list), and DeclType is the type of the declaration. When ICS is
/// non-null, this routine will compute the implicit conversion
/// sequence according to C++ [over.ics.ref] and will not produce any
/// diagnostics; when ICS is null, it will emit diagnostics when any
/// errors are found. Either way, a return value of true indicates
/// that there was a failure, a return value of false indicates that
/// the reference initialization succeeded.
///
/// When @p SuppressUserConversions, user-defined conversions are
/// suppressed.
/// When @p AllowExplicit, we also permit explicit user-defined
/// conversion functions.
/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue.
/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion.
/// This is used when this is called from a C-style cast.
bool
Sema::CheckReferenceInit(Expr *&Init, QualType DeclType,
SourceLocation DeclLoc,
bool SuppressUserConversions,
bool AllowExplicit, bool ForceRValue,
ImplicitConversionSequence *ICS,
bool IgnoreBaseAccess) {
assert(DeclType->isReferenceType() && "Reference init needs a reference");
QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType();
QualType T2 = Init->getType();
// If the initializer is the address of an overloaded function, try
// to resolve the overloaded function. If all goes well, T2 is the
// type of the resulting function.
if (Context.getCanonicalType(T2) == Context.OverloadTy) {
FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType,
ICS != 0);
if (Fn) {
// Since we're performing this reference-initialization for
// real, update the initializer with the resulting function.
if (!ICS) {
if (DiagnoseUseOfDecl(Fn, DeclLoc))
return true;
Init = FixOverloadedFunctionReference(Init, Fn);
}
T2 = Fn->getType();
}
}
// Compute some basic properties of the types and the initializer.
bool isRValRef = DeclType->isRValueReferenceType();
bool DerivedToBase = false;
Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression :
Init->isLvalue(Context);
ReferenceCompareResult RefRelationship
= CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase);
// Most paths end in a failed conversion.
if (ICS)
ICS->ConversionKind = ImplicitConversionSequence::BadConversion;
// C++ [dcl.init.ref]p5:
// A reference to type "cv1 T1" is initialized by an expression
// of type "cv2 T2" as follows:
// -- If the initializer expression
// Rvalue references cannot bind to lvalues (N2812).
// There is absolutely no situation where they can. In particular, note that
// this is ill-formed, even if B has a user-defined conversion to A&&:
// B b;
// A&& r = b;
if (isRValRef && InitLvalue == Expr::LV_Valid) {
if (!ICS)
Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref)
<< Init->getSourceRange();
return true;
}
bool BindsDirectly = false;
// -- is an lvalue (but is not a bit-field), and "cv1 T1" is
// reference-compatible with "cv2 T2," or
//
// Note that the bit-field check is skipped if we are just computing
// the implicit conversion sequence (C++ [over.best.ics]p2).
if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) &&
RefRelationship >= Ref_Compatible_With_Added_Qualification) {
BindsDirectly = true;
if (ICS) {
// C++ [over.ics.ref]p1:
// When a parameter of reference type binds directly (8.5.3)
// to an argument expression, the implicit conversion sequence
// is the identity conversion, unless the argument expression
// has a type that is a derived class of the parameter type,
// in which case the implicit conversion sequence is a
// derived-to-base Conversion (13.3.3.1).
ICS->ConversionKind = ImplicitConversionSequence::StandardConversion;
ICS->Standard.First = ICK_Identity;
ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity;
ICS->Standard.Third = ICK_Identity;
ICS->Standard.FromTypePtr = T2.getAsOpaquePtr();
ICS->Standard.ToTypePtr = T1.getAsOpaquePtr();
ICS->Standard.ReferenceBinding = true;
ICS->Standard.DirectBinding = true;
ICS->Standard.RRefBinding = false;
ICS->Standard.CopyConstructor = 0;
// Nothing more to do: the inaccessibility/ambiguity check for
// derived-to-base conversions is suppressed when we're
// computing the implicit conversion sequence (C++
// [over.best.ics]p2).
return false;
} else {
// Perform the conversion.
CastExpr::CastKind CK = CastExpr::CK_NoOp;
if (DerivedToBase)
CK = CastExpr::CK_DerivedToBase;
else if(CheckExceptionSpecCompatibility(Init, T1))
return true;
ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true);
}
}
// -- has a class type (i.e., T2 is a class type) and can be
// implicitly converted to an lvalue of type "cv3 T3,"
// where "cv1 T1" is reference-compatible with "cv3 T3"
// 92) (this conversion is selected by enumerating the
// applicable conversion functions (13.3.1.6) and choosing
// the best one through overload resolution (13.3)),
if (!isRValRef && !SuppressUserConversions && T2->isRecordType() &&
!RequireCompleteType(DeclLoc, T2, 0)) {
CXXRecordDecl *T2RecordDecl
= dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl());
OverloadCandidateSet CandidateSet;
const UnresolvedSet *Conversions
= T2RecordDecl->getVisibleConversionFunctions();
for (UnresolvedSet::iterator I = Conversions->begin(),
E = Conversions->end(); I != E; ++I) {
NamedDecl *D = *I;
CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
if (isa<UsingShadowDecl>(D))
D = cast<UsingShadowDecl>(D)->getTargetDecl();
FunctionTemplateDecl *ConvTemplate
= dyn_cast<FunctionTemplateDecl>(D);
CXXConversionDecl *Conv;
if (ConvTemplate)
Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
else
Conv = cast<CXXConversionDecl>(D);
// If the conversion function doesn't return a reference type,
// it can't be considered for this conversion.
if (Conv->getConversionType()->isLValueReferenceType() &&
(AllowExplicit || !Conv->isExplicit())) {
if (ConvTemplate)
AddTemplateConversionCandidate(ConvTemplate, ActingDC,
Init, DeclType, CandidateSet);
else
AddConversionCandidate(Conv, ActingDC, Init, DeclType, CandidateSet);
}
}
OverloadCandidateSet::iterator Best;
switch (BestViableFunction(CandidateSet, DeclLoc, Best)) {
case OR_Success:
// This is a direct binding.
BindsDirectly = true;
if (ICS) {
// C++ [over.ics.ref]p1:
//
// [...] If the parameter binds directly to the result of
// applying a conversion function to the argument
// expression, the implicit conversion sequence is a
// user-defined conversion sequence (13.3.3.1.2), with the
// second standard conversion sequence either an identity
// conversion or, if the conversion function returns an
// entity of a type that is a derived class of the parameter
// type, a derived-to-base Conversion.
ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion;
ICS->UserDefined.Before = Best->Conversions[0].Standard;
ICS->UserDefined.After = Best->FinalConversion;
ICS->UserDefined.ConversionFunction = Best->Function;
ICS->UserDefined.EllipsisConversion = false;
assert(ICS->UserDefined.After.ReferenceBinding &&
ICS->UserDefined.After.DirectBinding &&
"Expected a direct reference binding!");
return false;
} else {
OwningExprResult InitConversion =
BuildCXXCastArgument(DeclLoc, QualType(),
CastExpr::CK_UserDefinedConversion,
cast<CXXMethodDecl>(Best->Function),
Owned(Init));
Init = InitConversion.takeAs<Expr>();
if (CheckExceptionSpecCompatibility(Init, T1))
return true;
ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion,
/*isLvalue=*/true);
}
break;
case OR_Ambiguous:
if (ICS) {
for (OverloadCandidateSet::iterator Cand = CandidateSet.begin();
Cand != CandidateSet.end(); ++Cand)
if (Cand->Viable)
ICS->ConversionFunctionSet.push_back(Cand->Function);
break;
}
Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType()
<< Init->getSourceRange();
PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true);
return true;
case OR_No_Viable_Function:
case OR_Deleted:
// There was no suitable conversion, or we found a deleted
// conversion; continue with other checks.
break;
}
}
if (BindsDirectly) {
// C++ [dcl.init.ref]p4:
// [...] In all cases where the reference-related or
// reference-compatible relationship of two types is used to
// establish the validity of a reference binding, and T1 is a
// base class of T2, a program that necessitates such a binding
// is ill-formed if T1 is an inaccessible (clause 11) or
// ambiguous (10.2) base class of T2.
//
// Note that we only check this condition when we're allowed to
// complain about errors, because we should not be checking for
// ambiguity (or inaccessibility) unless the reference binding
// actually happens.
if (DerivedToBase)
return CheckDerivedToBaseConversion(T2, T1, DeclLoc,
Init->getSourceRange(),
IgnoreBaseAccess);
else
return false;
}
// -- Otherwise, the reference shall be to a non-volatile const
// type (i.e., cv1 shall be const), or the reference shall be an
// rvalue reference and the initializer expression shall be an rvalue.
if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) {
if (!ICS)
Diag(DeclLoc, diag::err_not_reference_to_const_init)
<< T1 << int(InitLvalue != Expr::LV_Valid)
<< T2 << Init->getSourceRange();
return true;
}
// -- If the initializer expression is an rvalue, with T2 a
// class type, and "cv1 T1" is reference-compatible with
// "cv2 T2," the reference is bound in one of the
// following ways (the choice is implementation-defined):
//
// -- The reference is bound to the object represented by
// the rvalue (see 3.10) or to a sub-object within that
// object.
//
// -- A temporary of type "cv1 T2" [sic] is created, and
// a constructor is called to copy the entire rvalue
// object into the temporary. The reference is bound to
// the temporary or to a sub-object within the
// temporary.
//
// The constructor that would be used to make the copy
// shall be callable whether or not the copy is actually
// done.
//
// Note that C++0x [dcl.init.ref]p5 takes away this implementation
// freedom, so we will always take the first option and never build
// a temporary in this case. FIXME: We will, however, have to check
// for the presence of a copy constructor in C++98/03 mode.
if (InitLvalue != Expr::LV_Valid && T2->isRecordType() &&
RefRelationship >= Ref_Compatible_With_Added_Qualification) {
if (ICS) {
ICS->ConversionKind = ImplicitConversionSequence::StandardConversion;
ICS->Standard.First = ICK_Identity;
ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity;
ICS->Standard.Third = ICK_Identity;
ICS->Standard.FromTypePtr = T2.getAsOpaquePtr();
ICS->Standard.ToTypePtr = T1.getAsOpaquePtr();
ICS->Standard.ReferenceBinding = true;
ICS->Standard.DirectBinding = false;
ICS->Standard.RRefBinding = isRValRef;
ICS->Standard.CopyConstructor = 0;
} else {
CastExpr::CastKind CK = CastExpr::CK_NoOp;
if (DerivedToBase)
CK = CastExpr::CK_DerivedToBase;
else if(CheckExceptionSpecCompatibility(Init, T1))
return true;
ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false);
}
return false;
}
// -- Otherwise, a temporary of type "cv1 T1" is created and
// initialized from the initializer expression using the
// rules for a non-reference copy initialization (8.5). The
// reference is then bound to the temporary. If T1 is
// reference-related to T2, cv1 must be the same
// cv-qualification as, or greater cv-qualification than,
// cv2; otherwise, the program is ill-formed.
if (RefRelationship == Ref_Related) {
// If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then
// we would be reference-compatible or reference-compatible with
// added qualification. But that wasn't the case, so the reference
// initialization fails.
if (!ICS)
Diag(DeclLoc, diag::err_reference_init_drops_quals)
<< T1 << int(InitLvalue != Expr::LV_Valid)
<< T2 << Init->getSourceRange();
return true;
}
// If at least one of the types is a class type, the types are not
// related, and we aren't allowed any user conversions, the
// reference binding fails. This case is important for breaking
// recursion, since TryImplicitConversion below will attempt to
// create a temporary through the use of a copy constructor.
if (SuppressUserConversions && RefRelationship == Ref_Incompatible &&
(T1->isRecordType() || T2->isRecordType())) {
if (!ICS)
Diag(DeclLoc, diag::err_typecheck_convert_incompatible)
<< DeclType << Init->getType() << AA_Initializing << Init->getSourceRange();
return true;
}
// Actually try to convert the initializer to T1.
if (ICS) {
// C++ [over.ics.ref]p2:
//
// When a parameter of reference type is not bound directly to
// an argument expression, the conversion sequence is the one
// required to convert the argument expression to the
// underlying type of the reference according to
// 13.3.3.1. Conceptually, this conversion sequence corresponds
// to copy-initializing a temporary of the underlying type with
// the argument expression. Any difference in top-level
// cv-qualification is subsumed by the initialization itself
// and does not constitute a conversion.
*ICS = TryImplicitConversion(Init, T1, SuppressUserConversions,
/*AllowExplicit=*/false,
/*ForceRValue=*/false,
/*InOverloadResolution=*/false);
// Of course, that's still a reference binding.
if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) {
ICS->Standard.ReferenceBinding = true;
ICS->Standard.RRefBinding = isRValRef;
} else if (ICS->ConversionKind ==
ImplicitConversionSequence::UserDefinedConversion) {
ICS->UserDefined.After.ReferenceBinding = true;
ICS->UserDefined.After.RRefBinding = isRValRef;
}
return ICS->ConversionKind == ImplicitConversionSequence::BadConversion;
} else {
ImplicitConversionSequence Conversions;
bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing,
false, false,
Conversions);
if (badConversion) {
if ((Conversions.ConversionKind ==
ImplicitConversionSequence::BadConversion)
&& !Conversions.ConversionFunctionSet.empty()) {
Diag(DeclLoc,
diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange();
for (int j = Conversions.ConversionFunctionSet.size()-1;
j >= 0; j--) {
FunctionDecl *Func = Conversions.ConversionFunctionSet[j];
Diag(Func->getLocation(), diag::err_ovl_candidate);
}
}
else {
if (isRValRef)
Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref)
<< Init->getSourceRange();
else
Diag(DeclLoc, diag::err_invalid_initialization)
<< DeclType << Init->getType() << Init->getSourceRange();
}
}
return badConversion;
}
}
static inline bool
CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef,
const FunctionDecl *FnDecl) {
const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext();
if (isa<NamespaceDecl>(DC)) {
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_declared_in_namespace)
<< FnDecl->getDeclName();
}
if (isa<TranslationUnitDecl>(DC) &&
FnDecl->getStorageClass() == FunctionDecl::Static) {
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_declared_static)
<< FnDecl->getDeclName();
}
return false;
}
static inline bool
CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl,
CanQualType ExpectedResultType,
CanQualType ExpectedFirstParamType,
unsigned DependentParamTypeDiag,
unsigned InvalidParamTypeDiag) {
QualType ResultType =
FnDecl->getType()->getAs<FunctionType>()->getResultType();
// Check that the result type is not dependent.
if (ResultType->isDependentType())
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_dependent_result_type)
<< FnDecl->getDeclName() << ExpectedResultType;
// Check that the result type is what we expect.
if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType)
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_invalid_result_type)
<< FnDecl->getDeclName() << ExpectedResultType;
// A function template must have at least 2 parameters.
if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2)
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_template_too_few_parameters)
<< FnDecl->getDeclName();
// The function decl must have at least 1 parameter.
if (FnDecl->getNumParams() == 0)
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_delete_too_few_parameters)
<< FnDecl->getDeclName();
// Check the the first parameter type is not dependent.
QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
if (FirstParamType->isDependentType())
return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag)
<< FnDecl->getDeclName() << ExpectedFirstParamType;
// Check that the first parameter type is what we expect.
if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() !=
ExpectedFirstParamType)
return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag)
<< FnDecl->getDeclName() << ExpectedFirstParamType;
return false;
}
static bool
CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
// C++ [basic.stc.dynamic.allocation]p1:
// A program is ill-formed if an allocation function is declared in a
// namespace scope other than global scope or declared static in global
// scope.
if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
return true;
CanQualType SizeTy =
SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType());
// C++ [basic.stc.dynamic.allocation]p1:
// The return type shall be void*. The first parameter shall have type
// std::size_t.
if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy,
SizeTy,
diag::err_operator_new_dependent_param_type,
diag::err_operator_new_param_type))
return true;
// C++ [basic.stc.dynamic.allocation]p1:
// The first parameter shall not have an associated default argument.
if (FnDecl->getParamDecl(0)->hasDefaultArg())
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_new_default_arg)
<< FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange();
return false;
}
static bool
CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) {
// C++ [basic.stc.dynamic.deallocation]p1:
// A program is ill-formed if deallocation functions are declared in a
// namespace scope other than global scope or declared static in global
// scope.
if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl))
return true;
// C++ [basic.stc.dynamic.deallocation]p2:
// Each deallocation function shall return void and its first parameter
// shall be void*.
if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy,
SemaRef.Context.VoidPtrTy,
diag::err_operator_delete_dependent_param_type,
diag::err_operator_delete_param_type))
return true;
QualType FirstParamType = FnDecl->getParamDecl(0)->getType();
if (FirstParamType->isDependentType())
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_delete_dependent_param_type)
<< FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy;
if (SemaRef.Context.getCanonicalType(FirstParamType) !=
SemaRef.Context.VoidPtrTy)
return SemaRef.Diag(FnDecl->getLocation(),
diag::err_operator_delete_param_type)
<< FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy;
return false;
}
/// CheckOverloadedOperatorDeclaration - Check whether the declaration
/// of this overloaded operator is well-formed. If so, returns false;
/// otherwise, emits appropriate diagnostics and returns true.
bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) {
assert(FnDecl && FnDecl->isOverloadedOperator() &&
"Expected an overloaded operator declaration");
OverloadedOperatorKind Op = FnDecl->getOverloadedOperator();
// C++ [over.oper]p5:
// The allocation and deallocation functions, operator new,
// operator new[], operator delete and operator delete[], are
// described completely in 3.7.3. The attributes and restrictions
// found in the rest of this subclause do not apply to them unless
// explicitly stated in 3.7.3.
if (Op == OO_Delete || Op == OO_Array_Delete)
return CheckOperatorDeleteDeclaration(*this, FnDecl);
if (Op == OO_New || Op == OO_Array_New)
return CheckOperatorNewDeclaration(*this, FnDecl);
// C++ [over.oper]p6:
// An operator function shall either be a non-static member
// function or be a non-member function and have at least one
// parameter whose type is a class, a reference to a class, an
// enumeration, or a reference to an enumeration.
if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) {
if (MethodDecl->isStatic())
return Diag(FnDecl->getLocation(),
diag::err_operator_overload_static) << FnDecl->getDeclName();
} else {
bool ClassOrEnumParam = false;
for (FunctionDecl::param_iterator Param = FnDecl->param_begin(),
ParamEnd = FnDecl->param_end();
Param != ParamEnd; ++Param) {
QualType ParamType = (*Param)->getType().getNonReferenceType();
if (ParamType->isDependentType() || ParamType->isRecordType() ||
ParamType->isEnumeralType()) {
ClassOrEnumParam = true;
break;
}
}
if (!ClassOrEnumParam)
return Diag(FnDecl->getLocation(),
diag::err_operator_overload_needs_class_or_enum)
<< FnDecl->getDeclName();
}
// C++ [over.oper]p8:
// An operator function cannot have default arguments (8.3.6),
// except where explicitly stated below.
//
// Only the function-call operator allows default arguments
// (C++ [over.call]p1).
if (Op != OO_Call) {
for (FunctionDecl::param_iterator Param = FnDecl->param_begin();
Param != FnDecl->param_end(); ++Param) {
if ((*Param)->hasDefaultArg())
return Diag((*Param)->getLocation(),
diag::err_operator_overload_default_arg)
<< FnDecl->getDeclName() << (*Param)->getDefaultArgRange();
}
}
static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = {
{ false, false, false }
#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
, { Unary, Binary, MemberOnly }
#include "clang/Basic/OperatorKinds.def"
};
bool CanBeUnaryOperator = OperatorUses[Op][0];
bool CanBeBinaryOperator = OperatorUses[Op][1];
bool MustBeMemberOperator = OperatorUses[Op][2];
// C++ [over.oper]p8:
// [...] Operator functions cannot have more or fewer parameters
// than the number required for the corresponding operator, as
// described in the rest of this subclause.
unsigned NumParams = FnDecl->getNumParams()
+ (isa<CXXMethodDecl>(FnDecl)? 1 : 0);
if (Op != OO_Call &&
((NumParams == 1 && !CanBeUnaryOperator) ||
(NumParams == 2 && !CanBeBinaryOperator) ||
(NumParams < 1) || (NumParams > 2))) {
// We have the wrong number of parameters.
unsigned ErrorKind;
if (CanBeUnaryOperator && CanBeBinaryOperator) {
ErrorKind = 2; // 2 -> unary or binary.
} else if (CanBeUnaryOperator) {
ErrorKind = 0; // 0 -> unary
} else {
assert(CanBeBinaryOperator &&
"All non-call overloaded operators are unary or binary!");
ErrorKind = 1; // 1 -> binary
}
return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be)
<< FnDecl->getDeclName() << NumParams << ErrorKind;
}
// Overloaded operators other than operator() cannot be variadic.
if (Op != OO_Call &&
FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) {
return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic)
<< FnDecl->getDeclName();
}
// Some operators must be non-static member functions.
if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) {
return Diag(FnDecl->getLocation(),
diag::err_operator_overload_must_be_member)
<< FnDecl->getDeclName();
}
// C++ [over.inc]p1:
// The user-defined function called operator++ implements the
// prefix and postfix ++ operator. If this function is a member
// function with no parameters, or a non-member function with one
// parameter of class or enumeration type, it defines the prefix
// increment operator ++ for objects of that type. If the function
// is a member function with one parameter (which shall be of type
// int) or a non-member function with two parameters (the second
// of which shall be of type int), it defines the postfix
// increment operator ++ for objects of that type.
if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) {
ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1);
bool ParamIsInt = false;
if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>())
ParamIsInt = BT->getKind() == BuiltinType::Int;
if (!ParamIsInt)
return Diag(LastParam->getLocation(),
diag::err_operator_overload_post_incdec_must_be_int)
<< LastParam->getType() << (Op == OO_MinusMinus);
}
// Notify the class if it got an assignment operator.
if (Op == OO_Equal) {
// Would have returned earlier otherwise.
assert(isa<CXXMethodDecl>(FnDecl) &&
"Overloaded = not member, but not filtered.");
CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl);
Method->getParent()->addedAssignmentOperator(Context, Method);
}
return false;
}
/// ActOnStartLinkageSpecification - Parsed the beginning of a C++
/// linkage specification, including the language and (if present)
/// the '{'. ExternLoc is the location of the 'extern', LangLoc is
/// the location of the language string literal, which is provided
/// by Lang/StrSize. LBraceLoc, if valid, provides the location of
/// the '{' brace. Otherwise, this linkage specification does not
/// have any braces.
Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S,
SourceLocation ExternLoc,
SourceLocation LangLoc,
const char *Lang,
unsigned StrSize,
SourceLocation LBraceLoc) {
LinkageSpecDecl::LanguageIDs Language;
if (strncmp(Lang, "\"C\"", StrSize) == 0)
Language = LinkageSpecDecl::lang_c;
else if (strncmp(Lang, "\"C++\"", StrSize) == 0)
Language = LinkageSpecDecl::lang_cxx;
else {
Diag(LangLoc, diag::err_bad_language);
return DeclPtrTy();
}
// FIXME: Add all the various semantics of linkage specifications
LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext,
LangLoc, Language,
LBraceLoc.isValid());
CurContext->addDecl(D);
PushDeclContext(S, D);
return DeclPtrTy::make(D);
}
/// ActOnFinishLinkageSpecification - Completely the definition of
/// the C++ linkage specification LinkageSpec. If RBraceLoc is
/// valid, it's the position of the closing '}' brace in a linkage
/// specification that uses braces.
Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S,
DeclPtrTy LinkageSpec,
SourceLocation RBraceLoc) {
if (LinkageSpec)
PopDeclContext();
return LinkageSpec;
}
/// \brief Perform semantic analysis for the variable declaration that
/// occurs within a C++ catch clause, returning the newly-created
/// variable.
VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType,
TypeSourceInfo *TInfo,
IdentifierInfo *Name,
SourceLocation Loc,
SourceRange Range) {
bool Invalid = false;
// Arrays and functions decay.
if (ExDeclType->isArrayType())
ExDeclType = Context.getArrayDecayedType(ExDeclType);
else if (ExDeclType->isFunctionType())
ExDeclType = Context.getPointerType(ExDeclType);
// C++ 15.3p1: The exception-declaration shall not denote an incomplete type.
// The exception-declaration shall not denote a pointer or reference to an
// incomplete type, other than [cv] void*.
// N2844 forbids rvalue references.
if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) {
Diag(Loc, diag::err_catch_rvalue_ref) << Range;
Invalid = true;
}
QualType BaseType = ExDeclType;
int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference
unsigned DK = diag::err_catch_incomplete;
if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
BaseType = Ptr->getPointeeType();
Mode = 1;
DK = diag::err_catch_incomplete_ptr;
} else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) {
// For the purpose of error recovery, we treat rvalue refs like lvalue refs.
BaseType = Ref->getPointeeType();
Mode = 2;
DK = diag::err_catch_incomplete_ref;
}
if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) &&
!BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK))
Invalid = true;
if (!Invalid && !ExDeclType->isDependentType() &&
RequireNonAbstractType(Loc, ExDeclType,
diag::err_abstract_type_in_decl,
AbstractVariableType))
Invalid = true;
// FIXME: Need to test for ability to copy-construct and destroy the
// exception variable.
// FIXME: Need to check for abstract classes.
VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc,
Name, ExDeclType, TInfo, VarDecl::None);
if (Invalid)
ExDecl->setInvalidDecl();
return ExDecl;
}
/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch
/// handler.
Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) {
TypeSourceInfo *TInfo = 0;
QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo);
bool Invalid = D.isInvalidType();
IdentifierInfo *II = D.getIdentifier();
if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) {
// The scope should be freshly made just for us. There is just no way
// it contains any previous declaration.
assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl)));
if (PrevDecl->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
}
}
if (D.getCXXScopeSpec().isSet() && !Invalid) {
Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator)
<< D.getCXXScopeSpec().getRange();
Invalid = true;
}
VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo,
D.getIdentifier(),
D.getIdentifierLoc(),
D.getDeclSpec().getSourceRange());
if (Invalid)
ExDecl->setInvalidDecl();
// Add the exception declaration into this scope.
if (II)
PushOnScopeChains(ExDecl, S);
else
CurContext->addDecl(ExDecl);
ProcessDeclAttributes(S, ExDecl, D);
return DeclPtrTy::make(ExDecl);
}
Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc,
ExprArg assertexpr,
ExprArg assertmessageexpr) {
Expr *AssertExpr = (Expr *)assertexpr.get();
StringLiteral *AssertMessage =
cast<StringLiteral>((Expr *)assertmessageexpr.get());
if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) {
llvm::APSInt Value(32);
if (!AssertExpr->isIntegerConstantExpr(Value, Context)) {
Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) <<
AssertExpr->getSourceRange();
return DeclPtrTy();
}
if (Value == 0) {
Diag(AssertLoc, diag::err_static_assert_failed)
<< AssertMessage->getString() << AssertExpr->getSourceRange();
}
}
assertexpr.release();
assertmessageexpr.release();
Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc,
AssertExpr, AssertMessage);
CurContext->addDecl(Decl);
return DeclPtrTy::make(Decl);
}
/// Handle a friend type declaration. This works in tandem with
/// ActOnTag.
///
/// Notes on friend class templates:
///
/// We generally treat friend class declarations as if they were
/// declaring a class. So, for example, the elaborated type specifier
/// in a friend declaration is required to obey the restrictions of a
/// class-head (i.e. no typedefs in the scope chain), template
/// parameters are required to match up with simple template-ids, &c.
/// However, unlike when declaring a template specialization, it's
/// okay to refer to a template specialization without an empty
/// template parameter declaration, e.g.
/// friend class A<T>::B<unsigned>;
/// We permit this as a special case; if there are any template
/// parameters present at all, require proper matching, i.e.
/// template <> template <class T> friend class A<int>::B;
Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
MultiTemplateParamsArg TempParams) {
SourceLocation Loc = DS.getSourceRange().getBegin();
assert(DS.isFriendSpecified());
assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
// Try to convert the decl specifier to a type. This works for
// friend templates because ActOnTag never produces a ClassTemplateDecl
// for a TUK_Friend.
Declarator TheDeclarator(DS, Declarator::MemberContext);
QualType T = GetTypeForDeclarator(TheDeclarator, S);
if (TheDeclarator.isInvalidType())
return DeclPtrTy();
// This is definitely an error in C++98. It's probably meant to
// be forbidden in C++0x, too, but the specification is just
// poorly written.
//
// The problem is with declarations like the following:
// template <T> friend A<T>::foo;
// where deciding whether a class C is a friend or not now hinges
// on whether there exists an instantiation of A that causes
// 'foo' to equal C. There are restrictions on class-heads
// (which we declare (by fiat) elaborated friend declarations to
// be) that makes this tractable.
//
// FIXME: handle "template <> friend class A<T>;", which
// is possibly well-formed? Who even knows?
if (TempParams.size() && !isa<ElaboratedType>(T)) {
Diag(Loc, diag::err_tagless_friend_type_template)
<< DS.getSourceRange();
return DeclPtrTy();
}
// C++ [class.friend]p2:
// An elaborated-type-specifier shall be used in a friend declaration
// for a class.*
// * The class-key of the elaborated-type-specifier is required.
// This is one of the rare places in Clang where it's legitimate to
// ask about the "spelling" of the type.
if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) {
// If we evaluated the type to a record type, suggest putting
// a tag in front.
if (const RecordType *RT = T->getAs<RecordType>()) {
RecordDecl *RD = RT->getDecl();
std::string InsertionText = std::string(" ") + RD->getKindName();
Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type)
<< (unsigned) RD->getTagKind()
<< T
<< SourceRange(DS.getFriendSpecLoc())
<< CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(),
InsertionText);
return DeclPtrTy();
}else {
Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend)
<< DS.getSourceRange();
return DeclPtrTy();
}
}
// Enum types cannot be friends.
if (T->getAs<EnumType>()) {
Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend)
<< SourceRange(DS.getFriendSpecLoc());
return DeclPtrTy();
}
// C++98 [class.friend]p1: A friend of a class is a function
// or class that is not a member of the class . . .
// This is fixed in DR77, which just barely didn't make the C++03
// deadline. It's also a very silly restriction that seriously
// affects inner classes and which nobody else seems to implement;
// thus we never diagnose it, not even in -pedantic.
Decl *D;
if (TempParams.size())
D = FriendTemplateDecl::Create(Context, CurContext, Loc,
TempParams.size(),
(TemplateParameterList**) TempParams.release(),
T.getTypePtr(),
DS.getFriendSpecLoc());
else
D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(),
DS.getFriendSpecLoc());
D->setAccess(AS_public);
CurContext->addDecl(D);
return DeclPtrTy::make(D);
}
Sema::DeclPtrTy
Sema::ActOnFriendFunctionDecl(Scope *S,
Declarator &D,
bool IsDefinition,
MultiTemplateParamsArg TemplateParams) {
const DeclSpec &DS = D.getDeclSpec();
assert(DS.isFriendSpecified());
assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified);
SourceLocation Loc = D.getIdentifierLoc();
TypeSourceInfo *TInfo = 0;
QualType T = GetTypeForDeclarator(D, S, &TInfo);
// C++ [class.friend]p1
// A friend of a class is a function or class....
// Note that this sees through typedefs, which is intended.
// It *doesn't* see through dependent types, which is correct
// according to [temp.arg.type]p3:
// If a declaration acquires a function type through a
// type dependent on a template-parameter and this causes
// a declaration that does not use the syntactic form of a
// function declarator to have a function type, the program
// is ill-formed.
if (!T->isFunctionType()) {
Diag(Loc, diag::err_unexpected_friend);
// It might be worthwhile to try to recover by creating an
// appropriate declaration.
return DeclPtrTy();
}
// C++ [namespace.memdef]p3
// - If a friend declaration in a non-local class first declares a
// class or function, the friend class or function is a member
// of the innermost enclosing namespace.
// - The name of the friend is not found by simple name lookup
// until a matching declaration is provided in that namespace
// scope (either before or after the class declaration granting
// friendship).
// - If a friend function is called, its name may be found by the
// name lookup that considers functions from namespaces and
// classes associated with the types of the function arguments.
// - When looking for a prior declaration of a class or a function
// declared as a friend, scopes outside the innermost enclosing
// namespace scope are not considered.
CXXScopeSpec &ScopeQual = D.getCXXScopeSpec();
DeclarationName Name = GetNameForDeclarator(D);
assert(Name);
// The context we found the declaration in, or in which we should
// create the declaration.
DeclContext *DC;
// FIXME: handle local classes
// Recover from invalid scope qualifiers as if they just weren't there.
LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName,
ForRedeclaration);
if (!ScopeQual.isInvalid() && ScopeQual.isSet()) {
// FIXME: RequireCompleteDeclContext
DC = computeDeclContext(ScopeQual);
// FIXME: handle dependent contexts
if (!DC) return DeclPtrTy();
LookupQualifiedName(Previous, DC);
// If searching in that context implicitly found a declaration in
// a different context, treat it like it wasn't found at all.
// TODO: better diagnostics for this case. Suggesting the right
// qualified scope would be nice...
// FIXME: getRepresentativeDecl() is not right here at all
if (Previous.empty() ||
!Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) {
D.setInvalidType();
Diag(Loc, diag::err_qualified_friend_not_found) << Name << T;
return DeclPtrTy();
}
// C++ [class.friend]p1: A friend of a class is a function or
// class that is not a member of the class . . .
if (DC->Equals(CurContext))
Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member);
// Otherwise walk out to the nearest namespace scope looking for matches.
} else {
// TODO: handle local class contexts.
DC = CurContext;
while (true) {
// Skip class contexts. If someone can cite chapter and verse
// for this behavior, that would be nice --- it's what GCC and
// EDG do, and it seems like a reasonable intent, but the spec
// really only says that checks for unqualified existing
// declarations should stop at the nearest enclosing namespace,
// not that they should only consider the nearest enclosing
// namespace.
while (DC->isRecord())
DC = DC->getParent();
LookupQualifiedName(Previous, DC);
// TODO: decide what we think about using declarations.
if (!Previous.empty())
break;
if (DC->isFileContext()) break;
DC = DC->getParent();
}
// C++ [class.friend]p1: A friend of a class is a function or
// class that is not a member of the class . . .
// C++0x changes this for both friend types and functions.
// Most C++ 98 compilers do seem to give an error here, so
// we do, too.
if (!Previous.empty() && DC->Equals(CurContext)
&& !getLangOptions().CPlusPlus0x)
Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member);
}
if (DC->isFileContext()) {
// This implies that it has to be an operator or function.
if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ||
D.getName().getKind() == UnqualifiedId::IK_DestructorName ||
D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) {
Diag(Loc, diag::err_introducing_special_friend) <<
(D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 :
D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2);
return DeclPtrTy();
}
}
bool Redeclaration = false;
NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous,
move(TemplateParams),
IsDefinition,
Redeclaration);
if (!ND) return DeclPtrTy();
assert(ND->getDeclContext() == DC);
assert(ND->getLexicalDeclContext() == CurContext);
// Add the function declaration to the appropriate lookup tables,
// adjusting the redeclarations list as necessary. We don't
// want to do this yet if the friending class is dependent.
//
// Also update the scope-based lookup if the target context's
// lookup context is in lexical scope.
if (!CurContext->isDependentContext()) {
DC = DC->getLookupContext();
DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false);
if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false);
}
FriendDecl *FrD = FriendDecl::Create(Context, CurContext,
D.getIdentifierLoc(), ND,
DS.getFriendSpecLoc());
FrD->setAccess(AS_public);
CurContext->addDecl(FrD);
return DeclPtrTy::make(ND);
}
void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) {
AdjustDeclIfTemplate(dcl);
Decl *Dcl = dcl.getAs<Decl>();
FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl);
if (!Fn) {
Diag(DelLoc, diag::err_deleted_non_function);
return;
}
if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) {
Diag(DelLoc, diag::err_deleted_decl_not_first);
Diag(Prev->getLocation(), diag::note_previous_declaration);
// If the declaration wasn't the first, we delete the function anyway for
// recovery.
}
Fn->setDeleted();
}
static void SearchForReturnInStmt(Sema &Self, Stmt *S) {
for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E;
++CI) {
Stmt *SubStmt = *CI;
if (!SubStmt)
continue;
if (isa<ReturnStmt>(SubStmt))
Self.Diag(SubStmt->getSourceRange().getBegin(),
diag::err_return_in_constructor_handler);
if (!isa<Expr>(SubStmt))
SearchForReturnInStmt(Self, SubStmt);
}
}
void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) {
for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) {
CXXCatchStmt *Handler = TryBlock->getHandler(I);
SearchForReturnInStmt(*this, Handler);
}
}
bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
const CXXMethodDecl *Old) {
QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType();
QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType();
QualType CNewTy = Context.getCanonicalType(NewTy);
QualType COldTy = Context.getCanonicalType(OldTy);
if (CNewTy == COldTy &&
CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers())
return false;
// Check if the return types are covariant
QualType NewClassTy, OldClassTy;
/// Both types must be pointers or references to classes.
if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) {
if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) {
NewClassTy = NewPT->getPointeeType();
OldClassTy = OldPT->getPointeeType();
}
} else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) {
if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) {
NewClassTy = NewRT->getPointeeType();
OldClassTy = OldRT->getPointeeType();
}
}
// The return types aren't either both pointers or references to a class type.
if (NewClassTy.isNull()) {
Diag(New->getLocation(),
diag::err_different_return_type_for_overriding_virtual_function)
<< New->getDeclName() << NewTy << OldTy;
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
}
if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) {
// Check if the new class derives from the old class.
if (!IsDerivedFrom(NewClassTy, OldClassTy)) {
Diag(New->getLocation(),
diag::err_covariant_return_not_derived)
<< New->getDeclName() << NewTy << OldTy;
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
}
// Check if we the conversion from derived to base is valid.
if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy,
diag::err_covariant_return_inaccessible_base,
diag::err_covariant_return_ambiguous_derived_to_base_conv,
// FIXME: Should this point to the return type?
New->getLocation(), SourceRange(), New->getDeclName())) {
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
}
}
// The qualifiers of the return types must be the same.
if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) {
Diag(New->getLocation(),
diag::err_covariant_return_type_different_qualifications)
<< New->getDeclName() << NewTy << OldTy;
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
};
// The new class type must have the same or less qualifiers as the old type.
if (NewClassTy.isMoreQualifiedThan(OldClassTy)) {
Diag(New->getLocation(),
diag::err_covariant_return_type_class_type_more_qualified)
<< New->getDeclName() << NewTy << OldTy;
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
};
return false;
}
bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
const CXXMethodDecl *Old)
{
if (Old->hasAttr<FinalAttr>()) {
Diag(New->getLocation(), diag::err_final_function_overridden)
<< New->getDeclName();
Diag(Old->getLocation(), diag::note_overridden_virtual_function);
return true;
}
return false;
}
/// \brief Mark the given method pure.
///
/// \param Method the method to be marked pure.
///
/// \param InitRange the source range that covers the "0" initializer.
bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) {
if (Method->isVirtual() || Method->getParent()->isDependentContext()) {
Method->setPure();
// A class is abstract if at least one function is pure virtual.
Method->getParent()->setAbstract(true);
return false;
}
if (!Method->isInvalidDecl())
Diag(Method->getLocation(), diag::err_non_virtual_pure)
<< Method->getDeclName() << InitRange;
return true;
}
/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse
/// an initializer for the out-of-line declaration 'Dcl'. The scope
/// is a fresh scope pushed for just this purpose.
///
/// 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) {
// If there is no declaration, there was an error parsing it.
Decl *D = Dcl.getAs<Decl>();
if (D == 0) return;
// We should only get called for declarations with scope specifiers, like:
// int foo::bar;
assert(D->isOutOfLine());
EnterDeclaratorContext(S, D->getDeclContext());
}
/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
/// initializer for the out-of-line declaration 'Dcl'.
void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) {
// If there is no declaration, there was an error parsing it.
Decl *D = Dcl.getAs<Decl>();
if (D == 0) return;
assert(D->isOutOfLine());
ExitDeclaratorContext(S);
}
/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
/// C++ if/switch/while/for statement.
/// e.g: "if (int x = f()) {...}"
Action::DeclResult
Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) {
// C++ 6.4p2:
// The declarator shall not specify a function or an array.
// The type-specifier-seq shall not contain typedef and shall not declare a
// new class or enumeration.
assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
"Parser allowed 'typedef' as storage class of condition decl.");
TypeSourceInfo *TInfo = 0;
TagDecl *OwnedTag = 0;
QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag);
if (Ty->isFunctionType()) { // The declarator shall not specify a function...
// We exit without creating a CXXConditionDeclExpr because a FunctionDecl
// would be created and CXXConditionDeclExpr wants a VarDecl.
Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type)
<< D.getSourceRange();
return DeclResult();
} else if (OwnedTag && OwnedTag->isDefinition()) {
// The type-specifier-seq shall not declare a new class or enumeration.
Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition);
}
DeclPtrTy Dcl = ActOnDeclarator(S, D);
if (!Dcl)
return DeclResult();
VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>());
VD->setDeclaredInCondition(true);
return Dcl;
}
void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc,
CXXMethodDecl *MD) {
// Ignore dependent types.
if (MD->isDependentContext())
return;
CXXRecordDecl *RD = MD->getParent();
// Ignore classes without a vtable.
if (!RD->isDynamicClass())
return;
if (!MD->isOutOfLine()) {
// The only inline functions we care about are constructors. We also defer
// marking the virtual members as referenced until we've reached the end
// of the translation unit. We do this because we need to know the key
// function of the class in order to determine the key function.
if (isa<CXXConstructorDecl>(MD))
ClassesWithUnmarkedVirtualMembers.insert(std::make_pair(RD, Loc));
return;
}
const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD);
if (!KeyFunction) {
// This record does not have a key function, so we assume that the vtable
// will be emitted when it's used by the constructor.
if (!isa<CXXConstructorDecl>(MD))
return;
} else if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) {
// We don't have the right key function.
return;
}
// Mark the members as referenced.
MarkVirtualMembersReferenced(Loc, RD);
ClassesWithUnmarkedVirtualMembers.erase(RD);
}
bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() {
if (ClassesWithUnmarkedVirtualMembers.empty())
return false;
for (std::map<CXXRecordDecl *, SourceLocation>::iterator i =
ClassesWithUnmarkedVirtualMembers.begin(),
e = ClassesWithUnmarkedVirtualMembers.end(); i != e; ++i) {
CXXRecordDecl *RD = i->first;
const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD);
if (KeyFunction) {
// We know that the class has a key function. If the key function was
// declared in this translation unit, then it the class decl would not
// have been in the ClassesWithUnmarkedVirtualMembers map.
continue;
}
SourceLocation Loc = i->second;
MarkVirtualMembersReferenced(Loc, RD);
}
ClassesWithUnmarkedVirtualMembers.clear();
return true;
}
void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) {
for (CXXRecordDecl::method_iterator i = RD->method_begin(),
e = RD->method_end(); i != e; ++i) {
CXXMethodDecl *MD = *i;
// C++ [basic.def.odr]p2:
// [...] A virtual member function is used if it is not pure. [...]
if (MD->isVirtual() && !MD->isPure())
MarkDeclarationReferenced(Loc, MD);
}
}