llvm-project/clang/lib/AST/ExprCXX.cpp

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//===--- ExprCXX.cpp - (C++) Expression 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 subclesses of Expr class declared in ExprCXX.h
//
//===----------------------------------------------------------------------===//
#include "clang/Basic/IdentifierTable.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/ExprCXX.h"
using namespace clang;
void CXXConditionDeclExpr::Destroy(ASTContext& C) {
// FIXME: Cannot destroy the decl here, because it is linked into the
// DeclContext's chain.
//getVarDecl()->Destroy(C);
this->~CXXConditionDeclExpr();
C.Deallocate(this);
}
//===----------------------------------------------------------------------===//
// Child Iterators for iterating over subexpressions/substatements
//===----------------------------------------------------------------------===//
// CXXTypeidExpr - has child iterators if the operand is an expression
Stmt::child_iterator CXXTypeidExpr::child_begin() {
return isTypeOperand() ? child_iterator() : &Operand.Ex;
}
Stmt::child_iterator CXXTypeidExpr::child_end() {
return isTypeOperand() ? child_iterator() : &Operand.Ex+1;
}
// CXXBoolLiteralExpr
Stmt::child_iterator CXXBoolLiteralExpr::child_begin() {
return child_iterator();
}
Stmt::child_iterator CXXBoolLiteralExpr::child_end() {
return child_iterator();
}
// CXXThisExpr
Stmt::child_iterator CXXThisExpr::child_begin() { return child_iterator(); }
Stmt::child_iterator CXXThisExpr::child_end() { return child_iterator(); }
// CXXThrowExpr
Stmt::child_iterator CXXThrowExpr::child_begin() { return &Op; }
Stmt::child_iterator CXXThrowExpr::child_end() {
// If Op is 0, we are processing throw; which has no children.
return Op ? &Op+1 : &Op;
}
// CXXDefaultArgExpr
Stmt::child_iterator CXXDefaultArgExpr::child_begin() {
return child_iterator();
}
Stmt::child_iterator CXXDefaultArgExpr::child_end() {
return child_iterator();
}
// CXXTemporaryObjectExpr
Stmt::child_iterator CXXTemporaryObjectExpr::child_begin() {
return child_iterator(Args);
}
Stmt::child_iterator CXXTemporaryObjectExpr::child_end() {
return child_iterator(Args + NumArgs);
}
// CXXZeroInitValueExpr
Stmt::child_iterator CXXZeroInitValueExpr::child_begin() {
return child_iterator();
}
Stmt::child_iterator CXXZeroInitValueExpr::child_end() {
return child_iterator();
}
// CXXConditionDeclExpr
Stmt::child_iterator CXXConditionDeclExpr::child_begin() {
return getVarDecl();
}
Stmt::child_iterator CXXConditionDeclExpr::child_end() {
return child_iterator();
}
// CXXNewExpr
CXXNewExpr::CXXNewExpr(bool globalNew, FunctionDecl *operatorNew,
Expr **placementArgs, unsigned numPlaceArgs,
bool parenTypeId, Expr *arraySize,
CXXConstructorDecl *constructor, bool initializer,
Expr **constructorArgs, unsigned numConsArgs,
FunctionDecl *operatorDelete, QualType ty,
SourceLocation startLoc, SourceLocation endLoc)
: Expr(CXXNewExprClass, ty), GlobalNew(globalNew), ParenTypeId(parenTypeId),
Initializer(initializer), Array(arraySize), NumPlacementArgs(numPlaceArgs),
NumConstructorArgs(numConsArgs), OperatorNew(operatorNew),
OperatorDelete(operatorDelete), Constructor(constructor),
StartLoc(startLoc), EndLoc(endLoc)
{
unsigned TotalSize = Array + NumPlacementArgs + NumConstructorArgs;
SubExprs = new Stmt*[TotalSize];
unsigned i = 0;
if (Array)
SubExprs[i++] = arraySize;
for (unsigned j = 0; j < NumPlacementArgs; ++j)
SubExprs[i++] = placementArgs[j];
for (unsigned j = 0; j < NumConstructorArgs; ++j)
SubExprs[i++] = constructorArgs[j];
assert(i == TotalSize);
}
Stmt::child_iterator CXXNewExpr::child_begin() { return &SubExprs[0]; }
Stmt::child_iterator CXXNewExpr::child_end() {
return &SubExprs[0] + Array + getNumPlacementArgs() + getNumConstructorArgs();
}
// CXXDeleteExpr
Stmt::child_iterator CXXDeleteExpr::child_begin() { return &Argument; }
Stmt::child_iterator CXXDeleteExpr::child_end() { return &Argument+1; }
// UnresolvedFunctionNameExpr
Stmt::child_iterator UnresolvedFunctionNameExpr::child_begin() {
return child_iterator();
}
Stmt::child_iterator UnresolvedFunctionNameExpr::child_end() {
return child_iterator();
}
// UnaryTypeTraitExpr
Stmt::child_iterator UnaryTypeTraitExpr::child_begin() {
return child_iterator();
}
Stmt::child_iterator UnaryTypeTraitExpr::child_end() {
return child_iterator();
}
bool UnaryTypeTraitExpr::Evaluate() const {
switch(UTT) {
default: assert(false && "Unknown type trait or not implemented");
case UTT_IsPOD: return QueriedType->isPODType();
case UTT_IsClass: // Fallthrough
case UTT_IsUnion:
if (const RecordType *Record = QueriedType->getAsRecordType()) {
bool Union = Record->getDecl()->isUnion();
return UTT == UTT_IsUnion ? Union : !Union;
}
return false;
case UTT_IsEnum: return QueriedType->isEnumeralType();
case UTT_IsPolymorphic:
if (const RecordType *Record = QueriedType->getAsRecordType()) {
// Type traits are only parsed in C++, so we've got CXXRecords.
return cast<CXXRecordDecl>(Record->getDecl())->isPolymorphic();
}
return false;
}
}
OverloadedOperatorKind CXXOperatorCallExpr::getOperator() const {
// All simple function calls (e.g. func()) are implicitly cast to pointer to
// function. As a result, we try and obtain the DeclRefExpr from the
// ImplicitCastExpr.
const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee());
if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()).
return OO_None;
const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr());
if (!DRE)
return OO_None;
if (const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()))
return FDecl->getDeclName().getCXXOverloadedOperator();
else if (const OverloadedFunctionDecl *Ovl
= dyn_cast<OverloadedFunctionDecl>(DRE->getDecl()))
return Ovl->getDeclName().getCXXOverloadedOperator();
else
return OO_None;
}
SourceRange CXXOperatorCallExpr::getSourceRange() const {
OverloadedOperatorKind Kind = getOperator();
if (Kind == OO_PlusPlus || Kind == OO_MinusMinus) {
if (getNumArgs() == 1)
// Prefix operator
return SourceRange(getOperatorLoc(),
getArg(0)->getSourceRange().getEnd());
else
// Postfix operator
return SourceRange(getArg(0)->getSourceRange().getEnd(),
getOperatorLoc());
} else if (Kind == OO_Call) {
return SourceRange(getArg(0)->getSourceRange().getBegin(), getRParenLoc());
} else if (Kind == OO_Subscript) {
return SourceRange(getArg(0)->getSourceRange().getBegin(), getRParenLoc());
} else if (getNumArgs() == 1) {
return SourceRange(getOperatorLoc(), getArg(0)->getSourceRange().getEnd());
} else if (getNumArgs() == 2) {
return SourceRange(getArg(0)->getSourceRange().getBegin(),
getArg(1)->getSourceRange().getEnd());
} else {
return SourceRange();
}
}
Expr *CXXMemberCallExpr::getImplicitObjectArgument() {
if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(getCallee()->IgnoreParens()))
return MemExpr->getBase();
// FIXME: Will eventually need to cope with member pointers.
return 0;
}
//===----------------------------------------------------------------------===//
// Named casts
//===----------------------------------------------------------------------===//
/// getCastName - Get the name of the C++ cast being used, e.g.,
/// "static_cast", "dynamic_cast", "reinterpret_cast", or
/// "const_cast". The returned pointer must not be freed.
const char *CXXNamedCastExpr::getCastName() const {
switch (getStmtClass()) {
case CXXStaticCastExprClass: return "static_cast";
case CXXDynamicCastExprClass: return "dynamic_cast";
case CXXReinterpretCastExprClass: return "reinterpret_cast";
case CXXConstCastExprClass: return "const_cast";
default: return "<invalid cast>";
}
}
CXXTemporaryObjectExpr::CXXTemporaryObjectExpr(CXXConstructorDecl *Cons,
QualType writtenTy,
SourceLocation tyBeginLoc,
Expr **Args,
unsigned NumArgs,
SourceLocation rParenLoc)
: Expr(CXXTemporaryObjectExprClass, writtenTy),
TyBeginLoc(tyBeginLoc), RParenLoc(rParenLoc),
Constructor(Cons), Args(0), NumArgs(NumArgs) {
if (NumArgs > 0) {
this->Args = new Stmt*[NumArgs];
for (unsigned i = 0; i < NumArgs; ++i)
this->Args[i] = Args[i];
}
}
CXXTemporaryObjectExpr::~CXXTemporaryObjectExpr() {
delete [] Args;
}