clang/lib/AST/DeclCXX.cpp - toolchain/llvm-project - Gitiles

 //===--- DeclCXX.cpp - C++ Declaration AST Node Implementation ------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the C++ related Decl classes.
 //
 //===----------------------------------------------------------------------===//

 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/ASTContext.h"
 using namespace clang;

 //===----------------------------------------------------------------------===//
 // Decl Allocation/Deallocation Method Implementations
 //===----------------------------------------------------------------------===//

 CXXFieldDecl *CXXFieldDecl::Create(ASTContext &C, CXXRecordDecl *RD,
                                    SourceLocation L, IdentifierInfo *Id,
                                    QualType T, Expr *BW) {
   void *Mem = C.getAllocator().Allocate<CXXFieldDecl>();
   return new (Mem) CXXFieldDecl(RD, L, Id, T, BW);
 }

 CXXRecordDecl *CXXRecordDecl::Create(ASTContext &C, TagKind TK, DeclContext *DC,
                                      SourceLocation L, IdentifierInfo *Id,
                                      CXXRecordDecl* PrevDecl) {
   void *Mem = C.getAllocator().Allocate<CXXRecordDecl>();
   CXXRecordDecl* R = new (Mem) CXXRecordDecl(TK, DC, L, Id);
   C.getTypeDeclType(R, PrevDecl);
   return R;
 }

 CXXRecordDecl::~CXXRecordDecl() {
   delete [] Bases;
 }

 void CXXRecordDecl::Destroy(ASTContext &C) {
   for (OverloadedFunctionDecl::function_iterator func
          = Constructors.function_begin();
        func != Constructors.function_end(); ++func)
     (*func)->Destroy(C);
   RecordDecl::Destroy(C);
 }

 void
 CXXRecordDecl::setBases(CXXBaseSpecifier const * const *Bases,
                         unsigned NumBases) {
   // C++ [dcl.init.aggr]p1:
   //   An aggregate is an array or a class (clause 9) with [...]
   //   no base classes [...].
   Aggregate = false;

   if (this->Bases)
     delete [] this->Bases;

   this->Bases = new CXXBaseSpecifier[NumBases];
   this->NumBases = NumBases;
   for (unsigned i = 0; i < NumBases; ++i)
     this->Bases[i] = *Bases[i];
 }

 bool CXXRecordDecl::hasConstCopyConstructor(ASTContext &Context) const {
   for (OverloadedFunctionDecl::function_const_iterator Con
          = Constructors.function_begin();
        Con != Constructors.function_end(); ++Con) {
     unsigned TypeQuals;
     if (cast<CXXConstructorDecl>(*Con)->isCopyConstructor(Context, TypeQuals) &&
         (TypeQuals & QualType::Const != 0))
       return true;
   }
   return false;
 }

 void
 CXXRecordDecl::addConstructor(ASTContext &Context,
                               CXXConstructorDecl *ConDecl) {
   if (!ConDecl->isImplicitlyDeclared()) {
     // Note that we have a user-declared constructor.
     UserDeclaredConstructor = true;

     // C++ [dcl.init.aggr]p1:
     //   An aggregate is an array or a class (clause 9) with no
     //   user-declared constructors (12.1) [...].
     Aggregate = false;

     // Note when we have a user-declared copy constructor, which will
     // suppress the implicit declaration of a copy constructor.
     if (ConDecl->isCopyConstructor(Context))
       UserDeclaredCopyConstructor = true;
   }

   Constructors.addOverload(ConDecl);
 }

 CXXMethodDecl *
 CXXMethodDecl::Create(ASTContext &C, CXXRecordDecl *RD,
                       SourceLocation L, IdentifierInfo *Id,
                       QualType T, bool isStatic, bool isInline,
                       ScopedDecl *PrevDecl) {
   void *Mem = C.getAllocator().Allocate<CXXMethodDecl>();
   return new (Mem) CXXMethodDecl(RD, L, Id, T, isStatic, isInline, PrevDecl);
 }

 QualType CXXMethodDecl::getThisType(ASTContext &C) const {
   // C++ 9.3.2p1: The type of this in a member function of a class X is X*.
   // If the member function is declared const, the type of this is const X*,
   // if the member function is declared volatile, the type of this is
   // volatile X*, and if the member function is declared const volatile,
   // the type of this is const volatile X*.

   assert(isInstance() && "No 'this' for static methods!");
   QualType ClassTy = C.getTagDeclType(const_cast<CXXRecordDecl*>(getParent()));
   ClassTy = ClassTy.getWithAdditionalQualifiers(getTypeQualifiers());
   return C.getPointerType(ClassTy).withConst();
 }

 CXXBaseOrMemberInitializer::
 CXXBaseOrMemberInitializer(QualType BaseType, Expr **Args, unsigned NumArgs)
   : Args(0), NumArgs(0) {
   BaseOrMember = reinterpret_cast<uintptr_t>(BaseType.getTypePtr());
   assert((BaseOrMember & 0x01) == 0 && "Invalid base class type pointer");
   BaseOrMember |= 0x01;

   if (NumArgs > 0) {
     this->NumArgs = NumArgs;
     this->Args = new Expr*[NumArgs];
     for (unsigned Idx = 0; Idx < NumArgs; ++Idx)
       this->Args[Idx] = Args[Idx];
   }
 }

 CXXBaseOrMemberInitializer::
 CXXBaseOrMemberInitializer(CXXFieldDecl *Member, Expr **Args, unsigned NumArgs)
   : Args(0), NumArgs(0) {
   BaseOrMember = reinterpret_cast<uintptr_t>(Member);
   assert((BaseOrMember & 0x01) == 0 && "Invalid member pointer");

   if (NumArgs > 0) {
     this->NumArgs = NumArgs;
     this->Args = new Expr*[NumArgs];
     for (unsigned Idx = 0; Idx < NumArgs; ++Idx)
       this->Args[Idx] = Args[Idx];
   }
 }

 CXXBaseOrMemberInitializer::~CXXBaseOrMemberInitializer() {
   delete [] Args;
 }

 CXXConstructorDecl *
 CXXConstructorDecl::Create(ASTContext &C, CXXRecordDecl *RD,
                            SourceLocation L, IdentifierInfo *Id,
                            QualType T, bool isExplicit,
                            bool isInline, bool isImplicitlyDeclared) {
   void *Mem = C.getAllocator().Allocate<CXXConstructorDecl>();
   return new (Mem) CXXConstructorDecl(RD, L, Id, T, isExplicit, isInline,
                                       isImplicitlyDeclared);
 }

 bool CXXConstructorDecl::isDefaultConstructor() const {
   // C++ [class.ctor]p5:
   //   A default constructor for a class X is a constructor of class
   //   X that can be called without an argument.
   return (getNumParams() == 0) ||
          (getNumParams() > 0 && getParamDecl(0)->getDefaultArg() != 0);
 }

 bool
 CXXConstructorDecl::isCopyConstructor(ASTContext &Context,
                                       unsigned &TypeQuals) const {
   // C++ [class.copy]p2:
   //   A non-template constructor for class X is a copy constructor
   //   if its first parameter is of type X&, const X&, volatile X& or
   //   const volatile X&, and either there are no other parameters
   //   or else all other parameters have default arguments (8.3.6).
   if ((getNumParams() < 1) ||
       (getNumParams() > 1 && getParamDecl(1)->getDefaultArg() == 0))
     return false;

   const ParmVarDecl *Param = getParamDecl(0);

   // Do we have a reference type?
   const ReferenceType *ParamRefType = Param->getType()->getAsReferenceType();
   if (!ParamRefType)
     return false;

   // Is it a reference to our class type?
   QualType PointeeType
     = Context.getCanonicalType(ParamRefType->getPointeeType());
   QualType ClassTy
     = Context.getTagDeclType(const_cast<CXXRecordDecl*>(getParent()));
   if (PointeeType.getUnqualifiedType() != ClassTy)
     return false;

   // We have a copy constructor.
   TypeQuals = PointeeType.getCVRQualifiers();
   return true;
 }

 bool CXXConstructorDecl::isConvertingConstructor() const {
   // C++ [class.conv.ctor]p1:
   //   A constructor declared without the function-specifier explicit
   //   that can be called with a single parameter specifies a
   //   conversion from the type of its first parameter to the type of
   //   its class. Such a constructor is called a converting
   //   constructor.
   if (isExplicit())
     return false;

   return (getNumParams() == 0 &&
           getType()->getAsFunctionTypeProto()->isVariadic()) ||
          (getNumParams() == 1) ||
          (getNumParams() > 1 && getParamDecl(1)->getDefaultArg() != 0);
 }

 CXXClassVarDecl *CXXClassVarDecl::Create(ASTContext &C, CXXRecordDecl *RD,
                                    SourceLocation L, IdentifierInfo *Id,
                                    QualType T, ScopedDecl *PrevDecl) {
   void *Mem = C.getAllocator().Allocate<CXXClassVarDecl>();
   return new (Mem) CXXClassVarDecl(RD, L, Id, T, PrevDecl);
 }

 OverloadedFunctionDecl *
 OverloadedFunctionDecl::Create(ASTContext &C, DeclContext *DC,
                                IdentifierInfo *Id) {
   void *Mem = C.getAllocator().Allocate<OverloadedFunctionDecl>();
   return new (Mem) OverloadedFunctionDecl(DC, Id);
 }

 LinkageSpecDecl *LinkageSpecDecl::Create(ASTContext &C,
                                          SourceLocation L,
                                          LanguageIDs Lang, Decl *D) {
   void *Mem = C.getAllocator().Allocate<LinkageSpecDecl>();
   return new (Mem) LinkageSpecDecl(L, Lang, D);
 }
	//===--- DeclCXX.cpp - C++ Declaration AST Node Implementation ------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file implements the C++ related Decl classes.
	//
	//===----------------------------------------------------------------------===//

	#include "clang/AST/DeclCXX.h"
	#include "clang/AST/ASTContext.h"
	using namespace clang;

	//===----------------------------------------------------------------------===//
	// Decl Allocation/Deallocation Method Implementations
	//===----------------------------------------------------------------------===//

	CXXFieldDecl CXXFieldDecl::Create(ASTContext &C, CXXRecordDecl RD,
	SourceLocation L, IdentifierInfo *Id,
	QualType T, Expr *BW) {
	void *Mem = C.getAllocator().Allocate<CXXFieldDecl>();
	return new (Mem) CXXFieldDecl(RD, L, Id, T, BW);
	}

	CXXRecordDecl CXXRecordDecl::Create(ASTContext &C, TagKind TK, DeclContext DC,
	SourceLocation L, IdentifierInfo *Id,
	CXXRecordDecl* PrevDecl) {
	void *Mem = C.getAllocator().Allocate<CXXRecordDecl>();
	CXXRecordDecl* R = new (Mem) CXXRecordDecl(TK, DC, L, Id);
	C.getTypeDeclType(R, PrevDecl);
	return R;
	}

	CXXRecordDecl::~CXXRecordDecl() {
	delete [] Bases;
	}

	void CXXRecordDecl::Destroy(ASTContext &C) {
	for (OverloadedFunctionDecl::function_iterator func
	= Constructors.function_begin();
	func != Constructors.function_end(); ++func)
	(*func)->Destroy(C);
	RecordDecl::Destroy(C);
	}

	void
	CXXRecordDecl::setBases(CXXBaseSpecifier const * const *Bases,
	unsigned NumBases) {
	// C++ [dcl.init.aggr]p1:
	// An aggregate is an array or a class (clause 9) with [...]
	// no base classes [...].
	Aggregate = false;

	if (this->Bases)
	delete [] this->Bases;

	this->Bases = new CXXBaseSpecifier[NumBases];
	this->NumBases = NumBases;
	for (unsigned i = 0; i < NumBases; ++i)
	this->Bases[i] = *Bases[i];
	}

	bool CXXRecordDecl::hasConstCopyConstructor(ASTContext &Context) const {
	for (OverloadedFunctionDecl::function_const_iterator Con
	= Constructors.function_begin();
	Con != Constructors.function_end(); ++Con) {
	unsigned TypeQuals;
	if (cast<CXXConstructorDecl>(*Con)->isCopyConstructor(Context, TypeQuals) &&
	(TypeQuals & QualType::Const != 0))
	return true;
	}
	return false;
	}

	void
	CXXRecordDecl::addConstructor(ASTContext &Context,
	CXXConstructorDecl *ConDecl) {
	if (!ConDecl->isImplicitlyDeclared()) {
	// Note that we have a user-declared constructor.
	UserDeclaredConstructor = true;

	// C++ [dcl.init.aggr]p1:
	// An aggregate is an array or a class (clause 9) with no
	// user-declared constructors (12.1) [...].
	Aggregate = false;

	// Note when we have a user-declared copy constructor, which will
	// suppress the implicit declaration of a copy constructor.
	if (ConDecl->isCopyConstructor(Context))
	UserDeclaredCopyConstructor = true;
	}

	Constructors.addOverload(ConDecl);
	}

	CXXMethodDecl *
	CXXMethodDecl::Create(ASTContext &C, CXXRecordDecl *RD,
	SourceLocation L, IdentifierInfo *Id,
	QualType T, bool isStatic, bool isInline,
	ScopedDecl *PrevDecl) {
	void *Mem = C.getAllocator().Allocate<CXXMethodDecl>();
	return new (Mem) CXXMethodDecl(RD, L, Id, T, isStatic, isInline, PrevDecl);
	}

	QualType CXXMethodDecl::getThisType(ASTContext &C) const {
	// C++ 9.3.2p1: The type of this in a member function of a class X is X*.
	// If the member function is declared const, the type of this is const X*,
	// if the member function is declared volatile, the type of this is
	// volatile X*, and if the member function is declared const volatile,
	// the type of this is const volatile X*.

	assert(isInstance() && "No 'this' for static methods!");
	QualType ClassTy = C.getTagDeclType(const_cast<CXXRecordDecl*>(getParent()));
	ClassTy = ClassTy.getWithAdditionalQualifiers(getTypeQualifiers());
	return C.getPointerType(ClassTy).withConst();
	}

	CXXBaseOrMemberInitializer::
	CXXBaseOrMemberInitializer(QualType BaseType, Expr **Args, unsigned NumArgs)
	: Args(0), NumArgs(0) {
	BaseOrMember = reinterpret_cast<uintptr_t>(BaseType.getTypePtr());
	assert((BaseOrMember & 0x01) == 0 && "Invalid base class type pointer");
	BaseOrMember \|= 0x01;

	if (NumArgs > 0) {
	this->NumArgs = NumArgs;
	this->Args = new Expr*[NumArgs];
	for (unsigned Idx = 0; Idx < NumArgs; ++Idx)
	this->Args[Idx] = Args[Idx];
	}
	}

	CXXBaseOrMemberInitializer::
	CXXBaseOrMemberInitializer(CXXFieldDecl Member, Expr *Args, unsigned NumArgs)
	: Args(0), NumArgs(0) {
	BaseOrMember = reinterpret_cast<uintptr_t>(Member);
	assert((BaseOrMember & 0x01) == 0 && "Invalid member pointer");

	if (NumArgs > 0) {
	this->NumArgs = NumArgs;
	this->Args = new Expr*[NumArgs];
	for (unsigned Idx = 0; Idx < NumArgs; ++Idx)
	this->Args[Idx] = Args[Idx];
	}
	}

	CXXBaseOrMemberInitializer::~CXXBaseOrMemberInitializer() {
	delete [] Args;
	}

	CXXConstructorDecl *
	CXXConstructorDecl::Create(ASTContext &C, CXXRecordDecl *RD,
	SourceLocation L, IdentifierInfo *Id,
	QualType T, bool isExplicit,
	bool isInline, bool isImplicitlyDeclared) {
	void *Mem = C.getAllocator().Allocate<CXXConstructorDecl>();
	return new (Mem) CXXConstructorDecl(RD, L, Id, T, isExplicit, isInline,
	isImplicitlyDeclared);
	}

	bool CXXConstructorDecl::isDefaultConstructor() const {
	// C++ [class.ctor]p5:
	// A default constructor for a class X is a constructor of class
	// X that can be called without an argument.
	return (getNumParams() == 0) \|\|
	(getNumParams() > 0 && getParamDecl(0)->getDefaultArg() != 0);
	}

	bool
	CXXConstructorDecl::isCopyConstructor(ASTContext &Context,
	unsigned &TypeQuals) const {
	// C++ [class.copy]p2:
	// A non-template constructor for class X is a copy constructor
	// if its first parameter is of type X&, const X&, volatile X& or
	// const volatile X&, and either there are no other parameters
	// or else all other parameters have default arguments (8.3.6).
	if ((getNumParams() < 1) \|\|
	(getNumParams() > 1 && getParamDecl(1)->getDefaultArg() == 0))
	return false;

	const ParmVarDecl *Param = getParamDecl(0);

	// Do we have a reference type?
	const ReferenceType *ParamRefType = Param->getType()->getAsReferenceType();
	if (!ParamRefType)
	return false;

	// Is it a reference to our class type?
	QualType PointeeType
	= Context.getCanonicalType(ParamRefType->getPointeeType());
	QualType ClassTy
	= Context.getTagDeclType(const_cast<CXXRecordDecl*>(getParent()));
	if (PointeeType.getUnqualifiedType() != ClassTy)
	return false;

	// We have a copy constructor.
	TypeQuals = PointeeType.getCVRQualifiers();
	return true;
	}

	bool CXXConstructorDecl::isConvertingConstructor() const {
	// C++ [class.conv.ctor]p1:
	// A constructor declared without the function-specifier explicit
	// that can be called with a single parameter specifies a
	// conversion from the type of its first parameter to the type of
	// its class. Such a constructor is called a converting
	// constructor.
	if (isExplicit())
	return false;

	return (getNumParams() == 0 &&
	getType()->getAsFunctionTypeProto()->isVariadic()) \|\|
	(getNumParams() == 1) \|\|
	(getNumParams() > 1 && getParamDecl(1)->getDefaultArg() != 0);
	}

	CXXClassVarDecl CXXClassVarDecl::Create(ASTContext &C, CXXRecordDecl RD,
	SourceLocation L, IdentifierInfo *Id,
	QualType T, ScopedDecl *PrevDecl) {
	void *Mem = C.getAllocator().Allocate<CXXClassVarDecl>();
	return new (Mem) CXXClassVarDecl(RD, L, Id, T, PrevDecl);
	}

	OverloadedFunctionDecl *
	OverloadedFunctionDecl::Create(ASTContext &C, DeclContext *DC,
	IdentifierInfo *Id) {
	void *Mem = C.getAllocator().Allocate<OverloadedFunctionDecl>();
	return new (Mem) OverloadedFunctionDecl(DC, Id);
	}

	LinkageSpecDecl *LinkageSpecDecl::Create(ASTContext &C,
	SourceLocation L,
	LanguageIDs Lang, Decl *D) {
	void *Mem = C.getAllocator().Allocate<LinkageSpecDecl>();
	return new (Mem) LinkageSpecDecl(L, Lang, D);
	}