зеркало из https://github.com/microsoft/clang-1.git
2314 строки
80 KiB
C++
2314 строки
80 KiB
C++
//===--- Expr.cpp - Expression AST Node Implementation --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Expr class and subclasses.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/Expr.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/APValue.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclTemplate.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/AST/StmtVisitor.h"
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#include "clang/Basic/Builtins.h"
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#include "clang/Basic/TargetInfo.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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using namespace clang;
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//===----------------------------------------------------------------------===//
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// Primary Expressions.
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//===----------------------------------------------------------------------===//
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// FIXME: Maybe this should use DeclPrinter with a special "print predefined
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// expr" policy instead.
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std::string PredefinedExpr::ComputeName(ASTContext &Context, IdentType IT,
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const Decl *CurrentDecl) {
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if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) {
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if (IT != PrettyFunction)
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return FD->getNameAsString();
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llvm::SmallString<256> Name;
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llvm::raw_svector_ostream Out(Name);
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if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
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if (MD->isVirtual())
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Out << "virtual ";
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}
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PrintingPolicy Policy(Context.getLangOptions());
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Policy.SuppressTagKind = true;
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std::string Proto = FD->getQualifiedNameAsString(Policy);
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const FunctionType *AFT = FD->getType()->getAs<FunctionType>();
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const FunctionProtoType *FT = 0;
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if (FD->hasWrittenPrototype())
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FT = dyn_cast<FunctionProtoType>(AFT);
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Proto += "(";
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if (FT) {
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llvm::raw_string_ostream POut(Proto);
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for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
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if (i) POut << ", ";
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std::string Param;
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FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy);
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POut << Param;
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}
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if (FT->isVariadic()) {
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if (FD->getNumParams()) POut << ", ";
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POut << "...";
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}
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}
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Proto += ")";
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AFT->getResultType().getAsStringInternal(Proto, Policy);
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Out << Proto;
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Out.flush();
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return Name.str().str();
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}
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if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) {
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llvm::SmallString<256> Name;
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llvm::raw_svector_ostream Out(Name);
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Out << (MD->isInstanceMethod() ? '-' : '+');
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Out << '[';
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Out << MD->getClassInterface()->getNameAsString();
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if (const ObjCCategoryImplDecl *CID =
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dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) {
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Out << '(';
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Out << CID->getNameAsString();
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Out << ')';
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}
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Out << ' ';
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Out << MD->getSelector().getAsString();
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Out << ']';
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Out.flush();
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return Name.str().str();
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}
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if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) {
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// __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
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return "top level";
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}
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return "";
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}
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/// getValueAsApproximateDouble - This returns the value as an inaccurate
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/// double. Note that this may cause loss of precision, but is useful for
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/// debugging dumps, etc.
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double FloatingLiteral::getValueAsApproximateDouble() const {
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llvm::APFloat V = getValue();
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bool ignored;
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V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
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&ignored);
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return V.convertToDouble();
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}
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StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData,
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unsigned ByteLength, bool Wide,
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QualType Ty,
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const SourceLocation *Loc,
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unsigned NumStrs) {
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// Allocate enough space for the StringLiteral plus an array of locations for
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// any concatenated string tokens.
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void *Mem = C.Allocate(sizeof(StringLiteral)+
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sizeof(SourceLocation)*(NumStrs-1),
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llvm::alignof<StringLiteral>());
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StringLiteral *SL = new (Mem) StringLiteral(Ty);
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// OPTIMIZE: could allocate this appended to the StringLiteral.
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char *AStrData = new (C, 1) char[ByteLength];
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memcpy(AStrData, StrData, ByteLength);
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SL->StrData = AStrData;
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SL->ByteLength = ByteLength;
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SL->IsWide = Wide;
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SL->TokLocs[0] = Loc[0];
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SL->NumConcatenated = NumStrs;
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if (NumStrs != 1)
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memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1));
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return SL;
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}
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StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) {
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void *Mem = C.Allocate(sizeof(StringLiteral)+
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sizeof(SourceLocation)*(NumStrs-1),
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llvm::alignof<StringLiteral>());
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StringLiteral *SL = new (Mem) StringLiteral(QualType());
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SL->StrData = 0;
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SL->ByteLength = 0;
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SL->NumConcatenated = NumStrs;
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return SL;
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}
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void StringLiteral::DoDestroy(ASTContext &C) {
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C.Deallocate(const_cast<char*>(StrData));
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Expr::DoDestroy(C);
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}
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void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) {
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if (StrData)
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C.Deallocate(const_cast<char*>(StrData));
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char *AStrData = new (C, 1) char[Str.size()];
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memcpy(AStrData, Str.data(), Str.size());
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StrData = AStrData;
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ByteLength = Str.size();
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}
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/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
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/// corresponds to, e.g. "sizeof" or "[pre]++".
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const char *UnaryOperator::getOpcodeStr(Opcode Op) {
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switch (Op) {
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default: assert(0 && "Unknown unary operator");
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case PostInc: return "++";
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case PostDec: return "--";
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case PreInc: return "++";
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case PreDec: return "--";
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case AddrOf: return "&";
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case Deref: return "*";
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case Plus: return "+";
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case Minus: return "-";
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case Not: return "~";
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case LNot: return "!";
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case Real: return "__real";
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case Imag: return "__imag";
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case Extension: return "__extension__";
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case OffsetOf: return "__builtin_offsetof";
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}
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}
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UnaryOperator::Opcode
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UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
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switch (OO) {
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default: assert(false && "No unary operator for overloaded function");
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case OO_PlusPlus: return Postfix ? PostInc : PreInc;
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case OO_MinusMinus: return Postfix ? PostDec : PreDec;
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case OO_Amp: return AddrOf;
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case OO_Star: return Deref;
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case OO_Plus: return Plus;
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case OO_Minus: return Minus;
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case OO_Tilde: return Not;
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case OO_Exclaim: return LNot;
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}
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}
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OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
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switch (Opc) {
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case PostInc: case PreInc: return OO_PlusPlus;
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case PostDec: case PreDec: return OO_MinusMinus;
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case AddrOf: return OO_Amp;
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case Deref: return OO_Star;
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case Plus: return OO_Plus;
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case Minus: return OO_Minus;
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case Not: return OO_Tilde;
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case LNot: return OO_Exclaim;
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default: return OO_None;
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}
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}
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//===----------------------------------------------------------------------===//
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// Postfix Operators.
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//===----------------------------------------------------------------------===//
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CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args,
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unsigned numargs, QualType t, SourceLocation rparenloc)
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: Expr(SC, t,
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fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs),
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fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)),
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NumArgs(numargs) {
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SubExprs = new (C) Stmt*[numargs+1];
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SubExprs[FN] = fn;
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for (unsigned i = 0; i != numargs; ++i)
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SubExprs[i+ARGS_START] = args[i];
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RParenLoc = rparenloc;
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}
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CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs,
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QualType t, SourceLocation rparenloc)
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: Expr(CallExprClass, t,
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fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs),
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fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)),
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NumArgs(numargs) {
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SubExprs = new (C) Stmt*[numargs+1];
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SubExprs[FN] = fn;
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for (unsigned i = 0; i != numargs; ++i)
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SubExprs[i+ARGS_START] = args[i];
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RParenLoc = rparenloc;
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}
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CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty)
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: Expr(SC, Empty), SubExprs(0), NumArgs(0) {
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SubExprs = new (C) Stmt*[1];
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}
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void CallExpr::DoDestroy(ASTContext& C) {
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DestroyChildren(C);
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if (SubExprs) C.Deallocate(SubExprs);
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this->~CallExpr();
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C.Deallocate(this);
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}
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FunctionDecl *CallExpr::getDirectCallee() {
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Expr *CEE = getCallee()->IgnoreParenCasts();
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if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE))
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return dyn_cast<FunctionDecl>(DRE->getDecl());
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return 0;
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}
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/// setNumArgs - This changes the number of arguments present in this call.
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/// Any orphaned expressions are deleted by this, and any new operands are set
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/// to null.
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void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) {
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// No change, just return.
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if (NumArgs == getNumArgs()) return;
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// If shrinking # arguments, just delete the extras and forgot them.
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if (NumArgs < getNumArgs()) {
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for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i)
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getArg(i)->Destroy(C);
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this->NumArgs = NumArgs;
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return;
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}
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// Otherwise, we are growing the # arguments. New an bigger argument array.
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Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1];
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// Copy over args.
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for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i)
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NewSubExprs[i] = SubExprs[i];
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// Null out new args.
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for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i)
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NewSubExprs[i] = 0;
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if (SubExprs) C.Deallocate(SubExprs);
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SubExprs = NewSubExprs;
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this->NumArgs = NumArgs;
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}
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/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If
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/// not, return 0.
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unsigned CallExpr::isBuiltinCall(ASTContext &Context) const {
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// All simple function calls (e.g. func()) are implicitly cast to pointer to
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// function. As a result, we try and obtain the DeclRefExpr from the
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// ImplicitCastExpr.
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const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee());
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if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()).
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return 0;
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const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr());
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if (!DRE)
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return 0;
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const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl());
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if (!FDecl)
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return 0;
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if (!FDecl->getIdentifier())
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return 0;
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return FDecl->getBuiltinID();
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}
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QualType CallExpr::getCallReturnType() const {
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QualType CalleeType = getCallee()->getType();
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if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>())
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CalleeType = FnTypePtr->getPointeeType();
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else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>())
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CalleeType = BPT->getPointeeType();
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const FunctionType *FnType = CalleeType->getAs<FunctionType>();
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return FnType->getResultType();
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}
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MemberExpr::MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual,
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SourceRange qualrange, NamedDecl *memberdecl,
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SourceLocation l, bool has_explicit,
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SourceLocation langle,
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const TemplateArgument *targs, unsigned numtargs,
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SourceLocation rangle, QualType ty)
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: Expr(MemberExprClass, ty,
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base->isTypeDependent() || (qual && qual->isDependent()),
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base->isValueDependent() || (qual && qual->isDependent())),
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Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow),
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HasQualifier(qual != 0), HasExplicitTemplateArgumentList(has_explicit) {
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// Initialize the qualifier, if any.
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if (HasQualifier) {
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NameQualifier *NQ = getMemberQualifier();
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NQ->NNS = qual;
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NQ->Range = qualrange;
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}
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// Initialize the explicit template argument list, if any.
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if (HasExplicitTemplateArgumentList) {
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ExplicitTemplateArgumentList *ETemplateArgs
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= getExplicitTemplateArgumentList();
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ETemplateArgs->LAngleLoc = langle;
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ETemplateArgs->RAngleLoc = rangle;
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ETemplateArgs->NumTemplateArgs = numtargs;
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TemplateArgument *TemplateArgs = ETemplateArgs->getTemplateArgs();
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for (unsigned I = 0; I < numtargs; ++I)
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new (TemplateArgs + I) TemplateArgument(targs[I]);
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}
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}
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MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow,
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NestedNameSpecifier *qual,
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SourceRange qualrange,
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NamedDecl *memberdecl,
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SourceLocation l,
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bool has_explicit,
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SourceLocation langle,
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const TemplateArgument *targs,
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unsigned numtargs,
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SourceLocation rangle,
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QualType ty) {
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std::size_t Size = sizeof(MemberExpr);
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if (qual != 0)
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Size += sizeof(NameQualifier);
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if (has_explicit)
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Size += sizeof(ExplicitTemplateArgumentList) +
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sizeof(TemplateArgument) * numtargs;
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void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>());
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return new (Mem) MemberExpr(base, isarrow, qual, qualrange, memberdecl, l,
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has_explicit, langle, targs, numtargs, rangle,
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ty);
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}
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const char *CastExpr::getCastKindName() const {
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switch (getCastKind()) {
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case CastExpr::CK_Unknown:
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return "Unknown";
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case CastExpr::CK_BitCast:
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return "BitCast";
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case CastExpr::CK_NoOp:
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return "NoOp";
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case CastExpr::CK_DerivedToBase:
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return "DerivedToBase";
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case CastExpr::CK_Dynamic:
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return "Dynamic";
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case CastExpr::CK_ToUnion:
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return "ToUnion";
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case CastExpr::CK_ArrayToPointerDecay:
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return "ArrayToPointerDecay";
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case CastExpr::CK_FunctionToPointerDecay:
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return "FunctionToPointerDecay";
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case CastExpr::CK_NullToMemberPointer:
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return "NullToMemberPointer";
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case CastExpr::CK_BaseToDerivedMemberPointer:
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return "BaseToDerivedMemberPointer";
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case CastExpr::CK_UserDefinedConversion:
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return "UserDefinedConversion";
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case CastExpr::CK_ConstructorConversion:
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return "ConstructorConversion";
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case CastExpr::CK_IntegralToPointer:
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return "IntegralToPointer";
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case CastExpr::CK_PointerToIntegral:
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return "PointerToIntegral";
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}
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assert(0 && "Unhandled cast kind!");
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return 0;
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}
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/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
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/// corresponds to, e.g. "<<=".
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const char *BinaryOperator::getOpcodeStr(Opcode Op) {
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switch (Op) {
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case PtrMemD: return ".*";
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case PtrMemI: return "->*";
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case Mul: return "*";
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case Div: return "/";
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case Rem: return "%";
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case Add: return "+";
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case Sub: return "-";
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case Shl: return "<<";
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case Shr: return ">>";
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case LT: return "<";
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case GT: return ">";
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case LE: return "<=";
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case GE: return ">=";
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case EQ: return "==";
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case NE: return "!=";
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case And: return "&";
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case Xor: return "^";
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case Or: return "|";
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case LAnd: return "&&";
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case LOr: return "||";
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case Assign: return "=";
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case MulAssign: return "*=";
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case DivAssign: return "/=";
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case RemAssign: return "%=";
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case AddAssign: return "+=";
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case SubAssign: return "-=";
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case ShlAssign: return "<<=";
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case ShrAssign: return ">>=";
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case AndAssign: return "&=";
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case XorAssign: return "^=";
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case OrAssign: return "|=";
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case Comma: return ",";
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}
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return "";
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}
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BinaryOperator::Opcode
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BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
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switch (OO) {
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default: assert(false && "Not an overloadable binary operator");
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case OO_Plus: return Add;
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case OO_Minus: return Sub;
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case OO_Star: return Mul;
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case OO_Slash: return Div;
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case OO_Percent: return Rem;
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case OO_Caret: return Xor;
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case OO_Amp: return And;
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case OO_Pipe: return Or;
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case OO_Equal: return Assign;
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case OO_Less: return LT;
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case OO_Greater: return GT;
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case OO_PlusEqual: return AddAssign;
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case OO_MinusEqual: return SubAssign;
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case OO_StarEqual: return MulAssign;
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case OO_SlashEqual: return DivAssign;
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|
case OO_PercentEqual: return RemAssign;
|
|
case OO_CaretEqual: return XorAssign;
|
|
case OO_AmpEqual: return AndAssign;
|
|
case OO_PipeEqual: return OrAssign;
|
|
case OO_LessLess: return Shl;
|
|
case OO_GreaterGreater: return Shr;
|
|
case OO_LessLessEqual: return ShlAssign;
|
|
case OO_GreaterGreaterEqual: return ShrAssign;
|
|
case OO_EqualEqual: return EQ;
|
|
case OO_ExclaimEqual: return NE;
|
|
case OO_LessEqual: return LE;
|
|
case OO_GreaterEqual: return GE;
|
|
case OO_AmpAmp: return LAnd;
|
|
case OO_PipePipe: return LOr;
|
|
case OO_Comma: return Comma;
|
|
case OO_ArrowStar: return PtrMemI;
|
|
}
|
|
}
|
|
|
|
OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
|
|
static const OverloadedOperatorKind OverOps[] = {
|
|
/* .* Cannot be overloaded */OO_None, OO_ArrowStar,
|
|
OO_Star, OO_Slash, OO_Percent,
|
|
OO_Plus, OO_Minus,
|
|
OO_LessLess, OO_GreaterGreater,
|
|
OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
|
|
OO_EqualEqual, OO_ExclaimEqual,
|
|
OO_Amp,
|
|
OO_Caret,
|
|
OO_Pipe,
|
|
OO_AmpAmp,
|
|
OO_PipePipe,
|
|
OO_Equal, OO_StarEqual,
|
|
OO_SlashEqual, OO_PercentEqual,
|
|
OO_PlusEqual, OO_MinusEqual,
|
|
OO_LessLessEqual, OO_GreaterGreaterEqual,
|
|
OO_AmpEqual, OO_CaretEqual,
|
|
OO_PipeEqual,
|
|
OO_Comma
|
|
};
|
|
return OverOps[Opc];
|
|
}
|
|
|
|
InitListExpr::InitListExpr(SourceLocation lbraceloc,
|
|
Expr **initExprs, unsigned numInits,
|
|
SourceLocation rbraceloc)
|
|
: Expr(InitListExprClass, QualType(),
|
|
hasAnyTypeDependentArguments(initExprs, numInits),
|
|
hasAnyValueDependentArguments(initExprs, numInits)),
|
|
LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0),
|
|
UnionFieldInit(0), HadArrayRangeDesignator(false) {
|
|
|
|
InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits);
|
|
}
|
|
|
|
void InitListExpr::reserveInits(unsigned NumInits) {
|
|
if (NumInits > InitExprs.size())
|
|
InitExprs.reserve(NumInits);
|
|
}
|
|
|
|
void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) {
|
|
for (unsigned Idx = NumInits, LastIdx = InitExprs.size();
|
|
Idx < LastIdx; ++Idx)
|
|
InitExprs[Idx]->Destroy(Context);
|
|
InitExprs.resize(NumInits, 0);
|
|
}
|
|
|
|
Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) {
|
|
if (Init >= InitExprs.size()) {
|
|
InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0);
|
|
InitExprs.back() = expr;
|
|
return 0;
|
|
}
|
|
|
|
Expr *Result = cast_or_null<Expr>(InitExprs[Init]);
|
|
InitExprs[Init] = expr;
|
|
return Result;
|
|
}
|
|
|
|
/// getFunctionType - Return the underlying function type for this block.
|
|
///
|
|
const FunctionType *BlockExpr::getFunctionType() const {
|
|
return getType()->getAs<BlockPointerType>()->
|
|
getPointeeType()->getAs<FunctionType>();
|
|
}
|
|
|
|
SourceLocation BlockExpr::getCaretLocation() const {
|
|
return TheBlock->getCaretLocation();
|
|
}
|
|
const Stmt *BlockExpr::getBody() const {
|
|
return TheBlock->getBody();
|
|
}
|
|
Stmt *BlockExpr::getBody() {
|
|
return TheBlock->getBody();
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Generic Expression Routines
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// isUnusedResultAWarning - Return true if this immediate expression should
|
|
/// be warned about if the result is unused. If so, fill in Loc and Ranges
|
|
/// with location to warn on and the source range[s] to report with the
|
|
/// warning.
|
|
bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1,
|
|
SourceRange &R2) const {
|
|
// Don't warn if the expr is type dependent. The type could end up
|
|
// instantiating to void.
|
|
if (isTypeDependent())
|
|
return false;
|
|
|
|
switch (getStmtClass()) {
|
|
default:
|
|
Loc = getExprLoc();
|
|
R1 = getSourceRange();
|
|
return true;
|
|
case ParenExprClass:
|
|
return cast<ParenExpr>(this)->getSubExpr()->
|
|
isUnusedResultAWarning(Loc, R1, R2);
|
|
case UnaryOperatorClass: {
|
|
const UnaryOperator *UO = cast<UnaryOperator>(this);
|
|
|
|
switch (UO->getOpcode()) {
|
|
default: break;
|
|
case UnaryOperator::PostInc:
|
|
case UnaryOperator::PostDec:
|
|
case UnaryOperator::PreInc:
|
|
case UnaryOperator::PreDec: // ++/--
|
|
return false; // Not a warning.
|
|
case UnaryOperator::Deref:
|
|
// Dereferencing a volatile pointer is a side-effect.
|
|
if (getType().isVolatileQualified())
|
|
return false;
|
|
break;
|
|
case UnaryOperator::Real:
|
|
case UnaryOperator::Imag:
|
|
// accessing a piece of a volatile complex is a side-effect.
|
|
if (UO->getSubExpr()->getType().isVolatileQualified())
|
|
return false;
|
|
break;
|
|
case UnaryOperator::Extension:
|
|
return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
|
|
}
|
|
Loc = UO->getOperatorLoc();
|
|
R1 = UO->getSubExpr()->getSourceRange();
|
|
return true;
|
|
}
|
|
case BinaryOperatorClass: {
|
|
const BinaryOperator *BO = cast<BinaryOperator>(this);
|
|
// Consider comma to have side effects if the LHS or RHS does.
|
|
if (BO->getOpcode() == BinaryOperator::Comma)
|
|
return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2) ||
|
|
BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2);
|
|
|
|
if (BO->isAssignmentOp())
|
|
return false;
|
|
Loc = BO->getOperatorLoc();
|
|
R1 = BO->getLHS()->getSourceRange();
|
|
R2 = BO->getRHS()->getSourceRange();
|
|
return true;
|
|
}
|
|
case CompoundAssignOperatorClass:
|
|
return false;
|
|
|
|
case ConditionalOperatorClass: {
|
|
// The condition must be evaluated, but if either the LHS or RHS is a
|
|
// warning, warn about them.
|
|
const ConditionalOperator *Exp = cast<ConditionalOperator>(this);
|
|
if (Exp->getLHS() &&
|
|
Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2))
|
|
return true;
|
|
return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2);
|
|
}
|
|
|
|
case MemberExprClass:
|
|
// If the base pointer or element is to a volatile pointer/field, accessing
|
|
// it is a side effect.
|
|
if (getType().isVolatileQualified())
|
|
return false;
|
|
Loc = cast<MemberExpr>(this)->getMemberLoc();
|
|
R1 = SourceRange(Loc, Loc);
|
|
R2 = cast<MemberExpr>(this)->getBase()->getSourceRange();
|
|
return true;
|
|
|
|
case ArraySubscriptExprClass:
|
|
// If the base pointer or element is to a volatile pointer/field, accessing
|
|
// it is a side effect.
|
|
if (getType().isVolatileQualified())
|
|
return false;
|
|
Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc();
|
|
R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange();
|
|
R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange();
|
|
return true;
|
|
|
|
case CallExprClass:
|
|
case CXXOperatorCallExprClass:
|
|
case CXXMemberCallExprClass: {
|
|
// If this is a direct call, get the callee.
|
|
const CallExpr *CE = cast<CallExpr>(this);
|
|
const Expr *CalleeExpr = CE->getCallee()->IgnoreParenCasts();
|
|
if (const DeclRefExpr *CalleeDRE = dyn_cast<DeclRefExpr>(CalleeExpr)) {
|
|
// If the callee has attribute pure, const, or warn_unused_result, warn
|
|
// about it. void foo() { strlen("bar"); } should warn.
|
|
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CalleeDRE->getDecl()))
|
|
if (FD->getAttr<WarnUnusedResultAttr>() ||
|
|
FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) {
|
|
Loc = CE->getCallee()->getLocStart();
|
|
R1 = CE->getCallee()->getSourceRange();
|
|
|
|
if (unsigned NumArgs = CE->getNumArgs())
|
|
R2 = SourceRange(CE->getArg(0)->getLocStart(),
|
|
CE->getArg(NumArgs-1)->getLocEnd());
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
case ObjCMessageExprClass:
|
|
return false;
|
|
|
|
case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send.
|
|
#if 0
|
|
const ObjCImplicitSetterGetterRefExpr *Ref =
|
|
cast<ObjCImplicitSetterGetterRefExpr>(this);
|
|
// FIXME: We really want the location of the '.' here.
|
|
Loc = Ref->getLocation();
|
|
R1 = SourceRange(Ref->getLocation(), Ref->getLocation());
|
|
if (Ref->getBase())
|
|
R2 = Ref->getBase()->getSourceRange();
|
|
#else
|
|
Loc = getExprLoc();
|
|
R1 = getSourceRange();
|
|
#endif
|
|
return true;
|
|
}
|
|
case StmtExprClass: {
|
|
// Statement exprs don't logically have side effects themselves, but are
|
|
// sometimes used in macros in ways that give them a type that is unused.
|
|
// For example ({ blah; foo(); }) will end up with a type if foo has a type.
|
|
// however, if the result of the stmt expr is dead, we don't want to emit a
|
|
// warning.
|
|
const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt();
|
|
if (!CS->body_empty())
|
|
if (const Expr *E = dyn_cast<Expr>(CS->body_back()))
|
|
return E->isUnusedResultAWarning(Loc, R1, R2);
|
|
|
|
Loc = cast<StmtExpr>(this)->getLParenLoc();
|
|
R1 = getSourceRange();
|
|
return true;
|
|
}
|
|
case CStyleCastExprClass:
|
|
// If this is an explicit cast to void, allow it. People do this when they
|
|
// think they know what they're doing :).
|
|
if (getType()->isVoidType())
|
|
return false;
|
|
Loc = cast<CStyleCastExpr>(this)->getLParenLoc();
|
|
R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange();
|
|
return true;
|
|
case CXXFunctionalCastExprClass:
|
|
// If this is a cast to void, check the operand. Otherwise, the result of
|
|
// the cast is unused.
|
|
if (getType()->isVoidType())
|
|
return cast<CastExpr>(this)->getSubExpr()
|
|
->isUnusedResultAWarning(Loc, R1, R2);
|
|
Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc();
|
|
R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange();
|
|
return true;
|
|
|
|
case ImplicitCastExprClass:
|
|
// Check the operand, since implicit casts are inserted by Sema
|
|
return cast<ImplicitCastExpr>(this)
|
|
->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
|
|
|
|
case CXXDefaultArgExprClass:
|
|
return cast<CXXDefaultArgExpr>(this)
|
|
->getExpr()->isUnusedResultAWarning(Loc, R1, R2);
|
|
|
|
case CXXNewExprClass:
|
|
// FIXME: In theory, there might be new expressions that don't have side
|
|
// effects (e.g. a placement new with an uninitialized POD).
|
|
case CXXDeleteExprClass:
|
|
return false;
|
|
case CXXBindTemporaryExprClass:
|
|
return cast<CXXBindTemporaryExpr>(this)
|
|
->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
|
|
case CXXExprWithTemporariesClass:
|
|
return cast<CXXExprWithTemporaries>(this)
|
|
->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
|
|
}
|
|
}
|
|
|
|
/// DeclCanBeLvalue - Determine whether the given declaration can be
|
|
/// an lvalue. This is a helper routine for isLvalue.
|
|
static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) {
|
|
// C++ [temp.param]p6:
|
|
// A non-type non-reference template-parameter is not an lvalue.
|
|
if (const NonTypeTemplateParmDecl *NTTParm
|
|
= dyn_cast<NonTypeTemplateParmDecl>(Decl))
|
|
return NTTParm->getType()->isReferenceType();
|
|
|
|
return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) ||
|
|
// C++ 3.10p2: An lvalue refers to an object or function.
|
|
(Ctx.getLangOptions().CPlusPlus &&
|
|
(isa<FunctionDecl>(Decl) || isa<OverloadedFunctionDecl>(Decl) ||
|
|
isa<FunctionTemplateDecl>(Decl)));
|
|
}
|
|
|
|
/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an
|
|
/// incomplete type other than void. Nonarray expressions that can be lvalues:
|
|
/// - name, where name must be a variable
|
|
/// - e[i]
|
|
/// - (e), where e must be an lvalue
|
|
/// - e.name, where e must be an lvalue
|
|
/// - e->name
|
|
/// - *e, the type of e cannot be a function type
|
|
/// - string-constant
|
|
/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension]
|
|
/// - reference type [C++ [expr]]
|
|
///
|
|
Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const {
|
|
assert(!TR->isReferenceType() && "Expressions can't have reference type.");
|
|
|
|
isLvalueResult Res = isLvalueInternal(Ctx);
|
|
if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus)
|
|
return Res;
|
|
|
|
// first, check the type (C99 6.3.2.1). Expressions with function
|
|
// type in C are not lvalues, but they can be lvalues in C++.
|
|
if (TR->isFunctionType() || TR == Ctx.OverloadTy)
|
|
return LV_NotObjectType;
|
|
|
|
// Allow qualified void which is an incomplete type other than void (yuck).
|
|
if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers())
|
|
return LV_IncompleteVoidType;
|
|
|
|
return LV_Valid;
|
|
}
|
|
|
|
// Check whether the expression can be sanely treated like an l-value
|
|
Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const {
|
|
switch (getStmtClass()) {
|
|
case StringLiteralClass: // C99 6.5.1p4
|
|
case ObjCEncodeExprClass: // @encode behaves like its string in every way.
|
|
return LV_Valid;
|
|
case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2))))
|
|
// For vectors, make sure base is an lvalue (i.e. not a function call).
|
|
if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType())
|
|
return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx);
|
|
return LV_Valid;
|
|
case DeclRefExprClass:
|
|
case QualifiedDeclRefExprClass: { // C99 6.5.1p2
|
|
const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl();
|
|
if (DeclCanBeLvalue(RefdDecl, Ctx))
|
|
return LV_Valid;
|
|
break;
|
|
}
|
|
case BlockDeclRefExprClass: {
|
|
const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this);
|
|
if (isa<VarDecl>(BDR->getDecl()))
|
|
return LV_Valid;
|
|
break;
|
|
}
|
|
case MemberExprClass: {
|
|
const MemberExpr *m = cast<MemberExpr>(this);
|
|
if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4:
|
|
NamedDecl *Member = m->getMemberDecl();
|
|
// C++ [expr.ref]p4:
|
|
// If E2 is declared to have type "reference to T", then E1.E2
|
|
// is an lvalue.
|
|
if (ValueDecl *Value = dyn_cast<ValueDecl>(Member))
|
|
if (Value->getType()->isReferenceType())
|
|
return LV_Valid;
|
|
|
|
// -- If E2 is a static data member [...] then E1.E2 is an lvalue.
|
|
if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord())
|
|
return LV_Valid;
|
|
|
|
// -- If E2 is a non-static data member [...]. If E1 is an
|
|
// lvalue, then E1.E2 is an lvalue.
|
|
if (isa<FieldDecl>(Member))
|
|
return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx);
|
|
|
|
// -- If it refers to a static member function [...], then
|
|
// E1.E2 is an lvalue.
|
|
// -- Otherwise, if E1.E2 refers to a non-static member
|
|
// function [...], then E1.E2 is not an lvalue.
|
|
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member))
|
|
return Method->isStatic()? LV_Valid : LV_MemberFunction;
|
|
|
|
// -- If E2 is a member enumerator [...], the expression E1.E2
|
|
// is not an lvalue.
|
|
if (isa<EnumConstantDecl>(Member))
|
|
return LV_InvalidExpression;
|
|
|
|
// Not an lvalue.
|
|
return LV_InvalidExpression;
|
|
}
|
|
|
|
// C99 6.5.2.3p4
|
|
return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx);
|
|
}
|
|
case UnaryOperatorClass:
|
|
if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref)
|
|
return LV_Valid; // C99 6.5.3p4
|
|
|
|
if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real ||
|
|
cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag ||
|
|
cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension)
|
|
return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU.
|
|
|
|
if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1
|
|
(cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc ||
|
|
cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec))
|
|
return LV_Valid;
|
|
break;
|
|
case ImplicitCastExprClass:
|
|
return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid
|
|
: LV_InvalidExpression;
|
|
case ParenExprClass: // C99 6.5.1p5
|
|
return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx);
|
|
case BinaryOperatorClass:
|
|
case CompoundAssignOperatorClass: {
|
|
const BinaryOperator *BinOp = cast<BinaryOperator>(this);
|
|
|
|
if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1
|
|
BinOp->getOpcode() == BinaryOperator::Comma)
|
|
return BinOp->getRHS()->isLvalue(Ctx);
|
|
|
|
// C++ [expr.mptr.oper]p6
|
|
if ((BinOp->getOpcode() == BinaryOperator::PtrMemD ||
|
|
BinOp->getOpcode() == BinaryOperator::PtrMemI) &&
|
|
!BinOp->getType()->isFunctionType())
|
|
return BinOp->getLHS()->isLvalue(Ctx);
|
|
|
|
if (!BinOp->isAssignmentOp())
|
|
return LV_InvalidExpression;
|
|
|
|
if (Ctx.getLangOptions().CPlusPlus)
|
|
// C++ [expr.ass]p1:
|
|
// The result of an assignment operation [...] is an lvalue.
|
|
return LV_Valid;
|
|
|
|
|
|
// C99 6.5.16:
|
|
// An assignment expression [...] is not an lvalue.
|
|
return LV_InvalidExpression;
|
|
}
|
|
case CallExprClass:
|
|
case CXXOperatorCallExprClass:
|
|
case CXXMemberCallExprClass: {
|
|
// C++0x [expr.call]p10
|
|
// A function call is an lvalue if and only if the result type
|
|
// is an lvalue reference.
|
|
QualType ReturnType = cast<CallExpr>(this)->getCallReturnType();
|
|
if (ReturnType->isLValueReferenceType())
|
|
return LV_Valid;
|
|
|
|
break;
|
|
}
|
|
case CompoundLiteralExprClass: // C99 6.5.2.5p5
|
|
return LV_Valid;
|
|
case ChooseExprClass:
|
|
// __builtin_choose_expr is an lvalue if the selected operand is.
|
|
return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx);
|
|
case ExtVectorElementExprClass:
|
|
if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements())
|
|
return LV_DuplicateVectorComponents;
|
|
return LV_Valid;
|
|
case ObjCIvarRefExprClass: // ObjC instance variables are lvalues.
|
|
return LV_Valid;
|
|
case ObjCPropertyRefExprClass: // FIXME: check if read-only property.
|
|
return LV_Valid;
|
|
case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property.
|
|
return LV_Valid;
|
|
case PredefinedExprClass:
|
|
return LV_Valid;
|
|
case CXXDefaultArgExprClass:
|
|
return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx);
|
|
case CXXConditionDeclExprClass:
|
|
return LV_Valid;
|
|
case CStyleCastExprClass:
|
|
case CXXFunctionalCastExprClass:
|
|
case CXXStaticCastExprClass:
|
|
case CXXDynamicCastExprClass:
|
|
case CXXReinterpretCastExprClass:
|
|
case CXXConstCastExprClass:
|
|
// The result of an explicit cast is an lvalue if the type we are
|
|
// casting to is an lvalue reference type. See C++ [expr.cast]p1,
|
|
// C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2,
|
|
// C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1.
|
|
if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()->
|
|
isLValueReferenceType())
|
|
return LV_Valid;
|
|
break;
|
|
case CXXTypeidExprClass:
|
|
// C++ 5.2.8p1: The result of a typeid expression is an lvalue of ...
|
|
return LV_Valid;
|
|
case CXXBindTemporaryExprClass:
|
|
return cast<CXXBindTemporaryExpr>(this)->getSubExpr()->
|
|
isLvalueInternal(Ctx);
|
|
case ConditionalOperatorClass: {
|
|
// Complicated handling is only for C++.
|
|
if (!Ctx.getLangOptions().CPlusPlus)
|
|
return LV_InvalidExpression;
|
|
|
|
// Sema should have taken care to ensure that a CXXTemporaryObjectExpr is
|
|
// everywhere there's an object converted to an rvalue. Also, any other
|
|
// casts should be wrapped by ImplicitCastExprs. There's just the special
|
|
// case involving throws to work out.
|
|
const ConditionalOperator *Cond = cast<ConditionalOperator>(this);
|
|
Expr *True = Cond->getTrueExpr();
|
|
Expr *False = Cond->getFalseExpr();
|
|
// C++0x 5.16p2
|
|
// If either the second or the third operand has type (cv) void, [...]
|
|
// the result [...] is an rvalue.
|
|
if (True->getType()->isVoidType() || False->getType()->isVoidType())
|
|
return LV_InvalidExpression;
|
|
|
|
// Both sides must be lvalues for the result to be an lvalue.
|
|
if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid)
|
|
return LV_InvalidExpression;
|
|
|
|
// That's it.
|
|
return LV_Valid;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
return LV_InvalidExpression;
|
|
}
|
|
|
|
/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type,
|
|
/// does not have an incomplete type, does not have a const-qualified type, and
|
|
/// if it is a structure or union, does not have any member (including,
|
|
/// recursively, any member or element of all contained aggregates or unions)
|
|
/// with a const-qualified type.
|
|
Expr::isModifiableLvalueResult
|
|
Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const {
|
|
isLvalueResult lvalResult = isLvalue(Ctx);
|
|
|
|
switch (lvalResult) {
|
|
case LV_Valid:
|
|
// C++ 3.10p11: Functions cannot be modified, but pointers to
|
|
// functions can be modifiable.
|
|
if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType())
|
|
return MLV_NotObjectType;
|
|
break;
|
|
|
|
case LV_NotObjectType: return MLV_NotObjectType;
|
|
case LV_IncompleteVoidType: return MLV_IncompleteVoidType;
|
|
case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents;
|
|
case LV_InvalidExpression:
|
|
// If the top level is a C-style cast, and the subexpression is a valid
|
|
// lvalue, then this is probably a use of the old-school "cast as lvalue"
|
|
// GCC extension. We don't support it, but we want to produce good
|
|
// diagnostics when it happens so that the user knows why.
|
|
if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) {
|
|
if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) {
|
|
if (Loc)
|
|
*Loc = CE->getLParenLoc();
|
|
return MLV_LValueCast;
|
|
}
|
|
}
|
|
return MLV_InvalidExpression;
|
|
case LV_MemberFunction: return MLV_MemberFunction;
|
|
}
|
|
|
|
// The following is illegal:
|
|
// void takeclosure(void (^C)(void));
|
|
// void func() { int x = 1; takeclosure(^{ x = 7; }); }
|
|
//
|
|
if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) {
|
|
if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl()))
|
|
return MLV_NotBlockQualified;
|
|
}
|
|
|
|
// Assigning to an 'implicit' property?
|
|
if (const ObjCImplicitSetterGetterRefExpr* Expr =
|
|
dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) {
|
|
if (Expr->getSetterMethod() == 0)
|
|
return MLV_NoSetterProperty;
|
|
}
|
|
|
|
QualType CT = Ctx.getCanonicalType(getType());
|
|
|
|
if (CT.isConstQualified())
|
|
return MLV_ConstQualified;
|
|
if (CT->isArrayType())
|
|
return MLV_ArrayType;
|
|
if (CT->isIncompleteType())
|
|
return MLV_IncompleteType;
|
|
|
|
if (const RecordType *r = CT->getAs<RecordType>()) {
|
|
if (r->hasConstFields())
|
|
return MLV_ConstQualified;
|
|
}
|
|
|
|
return MLV_Valid;
|
|
}
|
|
|
|
/// isOBJCGCCandidate - Check if an expression is objc gc'able.
|
|
/// returns true, if it is; false otherwise.
|
|
bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
|
|
switch (getStmtClass()) {
|
|
default:
|
|
return false;
|
|
case ObjCIvarRefExprClass:
|
|
return true;
|
|
case Expr::UnaryOperatorClass:
|
|
return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
|
|
case ParenExprClass:
|
|
return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
|
|
case ImplicitCastExprClass:
|
|
return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
|
|
case CStyleCastExprClass:
|
|
return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
|
|
case DeclRefExprClass:
|
|
case QualifiedDeclRefExprClass: {
|
|
const Decl *D = cast<DeclRefExpr>(this)->getDecl();
|
|
if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
|
|
if (VD->hasGlobalStorage())
|
|
return true;
|
|
QualType T = VD->getType();
|
|
// dereferencing to a pointer is always a gc'able candidate,
|
|
// unless it is __weak.
|
|
return T->isPointerType() &&
|
|
(Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak);
|
|
}
|
|
return false;
|
|
}
|
|
case MemberExprClass: {
|
|
const MemberExpr *M = cast<MemberExpr>(this);
|
|
return M->getBase()->isOBJCGCCandidate(Ctx);
|
|
}
|
|
case ArraySubscriptExprClass:
|
|
return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx);
|
|
}
|
|
}
|
|
Expr* Expr::IgnoreParens() {
|
|
Expr* E = this;
|
|
while (ParenExpr* P = dyn_cast<ParenExpr>(E))
|
|
E = P->getSubExpr();
|
|
|
|
return E;
|
|
}
|
|
|
|
/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr
|
|
/// or CastExprs or ImplicitCastExprs, returning their operand.
|
|
Expr *Expr::IgnoreParenCasts() {
|
|
Expr *E = this;
|
|
while (true) {
|
|
if (ParenExpr *P = dyn_cast<ParenExpr>(E))
|
|
E = P->getSubExpr();
|
|
else if (CastExpr *P = dyn_cast<CastExpr>(E))
|
|
E = P->getSubExpr();
|
|
else
|
|
return E;
|
|
}
|
|
}
|
|
|
|
/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the
|
|
/// value (including ptr->int casts of the same size). Strip off any
|
|
/// ParenExpr or CastExprs, returning their operand.
|
|
Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) {
|
|
Expr *E = this;
|
|
while (true) {
|
|
if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
|
|
E = P->getSubExpr();
|
|
continue;
|
|
}
|
|
|
|
if (CastExpr *P = dyn_cast<CastExpr>(E)) {
|
|
// We ignore integer <-> casts that are of the same width, ptr<->ptr and
|
|
// ptr<->int casts of the same width. We also ignore all identify casts.
|
|
Expr *SE = P->getSubExpr();
|
|
|
|
if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) {
|
|
E = SE;
|
|
continue;
|
|
}
|
|
|
|
if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) &&
|
|
(SE->getType()->isPointerType() || SE->getType()->isIntegralType()) &&
|
|
Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) {
|
|
E = SE;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
return E;
|
|
}
|
|
}
|
|
|
|
|
|
/// hasAnyTypeDependentArguments - Determines if any of the expressions
|
|
/// in Exprs is type-dependent.
|
|
bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) {
|
|
for (unsigned I = 0; I < NumExprs; ++I)
|
|
if (Exprs[I]->isTypeDependent())
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/// hasAnyValueDependentArguments - Determines if any of the expressions
|
|
/// in Exprs is value-dependent.
|
|
bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) {
|
|
for (unsigned I = 0; I < NumExprs; ++I)
|
|
if (Exprs[I]->isValueDependent())
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
bool Expr::isConstantInitializer(ASTContext &Ctx) const {
|
|
// This function is attempting whether an expression is an initializer
|
|
// which can be evaluated at compile-time. isEvaluatable handles most
|
|
// of the cases, but it can't deal with some initializer-specific
|
|
// expressions, and it can't deal with aggregates; we deal with those here,
|
|
// and fall back to isEvaluatable for the other cases.
|
|
|
|
// FIXME: This function assumes the variable being assigned to
|
|
// isn't a reference type!
|
|
|
|
switch (getStmtClass()) {
|
|
default: break;
|
|
case StringLiteralClass:
|
|
case ObjCStringLiteralClass:
|
|
case ObjCEncodeExprClass:
|
|
return true;
|
|
case CompoundLiteralExprClass: {
|
|
// This handles gcc's extension that allows global initializers like
|
|
// "struct x {int x;} x = (struct x) {};".
|
|
// FIXME: This accepts other cases it shouldn't!
|
|
const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer();
|
|
return Exp->isConstantInitializer(Ctx);
|
|
}
|
|
case InitListExprClass: {
|
|
// FIXME: This doesn't deal with fields with reference types correctly.
|
|
// FIXME: This incorrectly allows pointers cast to integers to be assigned
|
|
// to bitfields.
|
|
const InitListExpr *Exp = cast<InitListExpr>(this);
|
|
unsigned numInits = Exp->getNumInits();
|
|
for (unsigned i = 0; i < numInits; i++) {
|
|
if (!Exp->getInit(i)->isConstantInitializer(Ctx))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
case ImplicitValueInitExprClass:
|
|
return true;
|
|
case ParenExprClass: {
|
|
return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
|
|
}
|
|
case UnaryOperatorClass: {
|
|
const UnaryOperator* Exp = cast<UnaryOperator>(this);
|
|
if (Exp->getOpcode() == UnaryOperator::Extension)
|
|
return Exp->getSubExpr()->isConstantInitializer(Ctx);
|
|
break;
|
|
}
|
|
case ImplicitCastExprClass:
|
|
case CStyleCastExprClass:
|
|
// Handle casts with a destination that's a struct or union; this
|
|
// deals with both the gcc no-op struct cast extension and the
|
|
// cast-to-union extension.
|
|
if (getType()->isRecordType())
|
|
return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
|
|
break;
|
|
}
|
|
return isEvaluatable(Ctx);
|
|
}
|
|
|
|
/// isIntegerConstantExpr - this recursive routine will test if an expression is
|
|
/// an integer constant expression.
|
|
|
|
/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero,
|
|
/// comma, etc
|
|
///
|
|
/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof
|
|
/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer
|
|
/// cast+dereference.
|
|
|
|
// CheckICE - This function does the fundamental ICE checking: the returned
|
|
// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation.
|
|
// Note that to reduce code duplication, this helper does no evaluation
|
|
// itself; the caller checks whether the expression is evaluatable, and
|
|
// in the rare cases where CheckICE actually cares about the evaluated
|
|
// value, it calls into Evalute.
|
|
//
|
|
// Meanings of Val:
|
|
// 0: This expression is an ICE if it can be evaluated by Evaluate.
|
|
// 1: This expression is not an ICE, but if it isn't evaluated, it's
|
|
// a legal subexpression for an ICE. This return value is used to handle
|
|
// the comma operator in C99 mode.
|
|
// 2: This expression is not an ICE, and is not a legal subexpression for one.
|
|
|
|
struct ICEDiag {
|
|
unsigned Val;
|
|
SourceLocation Loc;
|
|
|
|
public:
|
|
ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {}
|
|
ICEDiag() : Val(0) {}
|
|
};
|
|
|
|
ICEDiag NoDiag() { return ICEDiag(); }
|
|
|
|
static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) {
|
|
Expr::EvalResult EVResult;
|
|
if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects ||
|
|
!EVResult.Val.isInt()) {
|
|
return ICEDiag(2, E->getLocStart());
|
|
}
|
|
return NoDiag();
|
|
}
|
|
|
|
static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) {
|
|
assert(!E->isValueDependent() && "Should not see value dependent exprs!");
|
|
if (!E->getType()->isIntegralType()) {
|
|
return ICEDiag(2, E->getLocStart());
|
|
}
|
|
|
|
switch (E->getStmtClass()) {
|
|
#define STMT(Node, Base) case Expr::Node##Class:
|
|
#define EXPR(Node, Base)
|
|
#include "clang/AST/StmtNodes.def"
|
|
case Expr::PredefinedExprClass:
|
|
case Expr::FloatingLiteralClass:
|
|
case Expr::ImaginaryLiteralClass:
|
|
case Expr::StringLiteralClass:
|
|
case Expr::ArraySubscriptExprClass:
|
|
case Expr::MemberExprClass:
|
|
case Expr::CompoundAssignOperatorClass:
|
|
case Expr::CompoundLiteralExprClass:
|
|
case Expr::ExtVectorElementExprClass:
|
|
case Expr::InitListExprClass:
|
|
case Expr::DesignatedInitExprClass:
|
|
case Expr::ImplicitValueInitExprClass:
|
|
case Expr::ParenListExprClass:
|
|
case Expr::VAArgExprClass:
|
|
case Expr::AddrLabelExprClass:
|
|
case Expr::StmtExprClass:
|
|
case Expr::CXXMemberCallExprClass:
|
|
case Expr::CXXDynamicCastExprClass:
|
|
case Expr::CXXTypeidExprClass:
|
|
case Expr::CXXNullPtrLiteralExprClass:
|
|
case Expr::CXXThisExprClass:
|
|
case Expr::CXXThrowExprClass:
|
|
case Expr::CXXConditionDeclExprClass: // FIXME: is this correct?
|
|
case Expr::CXXNewExprClass:
|
|
case Expr::CXXDeleteExprClass:
|
|
case Expr::CXXPseudoDestructorExprClass:
|
|
case Expr::UnresolvedFunctionNameExprClass:
|
|
case Expr::UnresolvedDeclRefExprClass:
|
|
case Expr::TemplateIdRefExprClass:
|
|
case Expr::CXXConstructExprClass:
|
|
case Expr::CXXBindTemporaryExprClass:
|
|
case Expr::CXXExprWithTemporariesClass:
|
|
case Expr::CXXTemporaryObjectExprClass:
|
|
case Expr::CXXUnresolvedConstructExprClass:
|
|
case Expr::CXXUnresolvedMemberExprClass:
|
|
case Expr::ObjCStringLiteralClass:
|
|
case Expr::ObjCEncodeExprClass:
|
|
case Expr::ObjCMessageExprClass:
|
|
case Expr::ObjCSelectorExprClass:
|
|
case Expr::ObjCProtocolExprClass:
|
|
case Expr::ObjCIvarRefExprClass:
|
|
case Expr::ObjCPropertyRefExprClass:
|
|
case Expr::ObjCImplicitSetterGetterRefExprClass:
|
|
case Expr::ObjCSuperExprClass:
|
|
case Expr::ObjCIsaExprClass:
|
|
case Expr::ShuffleVectorExprClass:
|
|
case Expr::BlockExprClass:
|
|
case Expr::BlockDeclRefExprClass:
|
|
case Expr::NoStmtClass:
|
|
case Expr::ExprClass:
|
|
return ICEDiag(2, E->getLocStart());
|
|
|
|
case Expr::GNUNullExprClass:
|
|
// GCC considers the GNU __null value to be an integral constant expression.
|
|
return NoDiag();
|
|
|
|
case Expr::ParenExprClass:
|
|
return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx);
|
|
case Expr::IntegerLiteralClass:
|
|
case Expr::CharacterLiteralClass:
|
|
case Expr::CXXBoolLiteralExprClass:
|
|
case Expr::CXXZeroInitValueExprClass:
|
|
case Expr::TypesCompatibleExprClass:
|
|
case Expr::UnaryTypeTraitExprClass:
|
|
return NoDiag();
|
|
case Expr::CallExprClass:
|
|
case Expr::CXXOperatorCallExprClass: {
|
|
const CallExpr *CE = cast<CallExpr>(E);
|
|
if (CE->isBuiltinCall(Ctx))
|
|
return CheckEvalInICE(E, Ctx);
|
|
return ICEDiag(2, E->getLocStart());
|
|
}
|
|
case Expr::DeclRefExprClass:
|
|
case Expr::QualifiedDeclRefExprClass:
|
|
if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl()))
|
|
return NoDiag();
|
|
if (Ctx.getLangOptions().CPlusPlus &&
|
|
E->getType().getCVRQualifiers() == Qualifiers::Const) {
|
|
// C++ 7.1.5.1p2
|
|
// A variable of non-volatile const-qualified integral or enumeration
|
|
// type initialized by an ICE can be used in ICEs.
|
|
if (const VarDecl *Dcl =
|
|
dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) {
|
|
if (Dcl->isInitKnownICE()) {
|
|
// We have already checked whether this subexpression is an
|
|
// integral constant expression.
|
|
if (Dcl->isInitICE())
|
|
return NoDiag();
|
|
else
|
|
return ICEDiag(2, E->getLocStart());
|
|
}
|
|
|
|
if (const Expr *Init = Dcl->getInit()) {
|
|
ICEDiag Result = CheckICE(Init, Ctx);
|
|
// Cache the result of the ICE test.
|
|
Dcl->setInitKnownICE(Ctx, Result.Val == 0);
|
|
return Result;
|
|
}
|
|
}
|
|
}
|
|
return ICEDiag(2, E->getLocStart());
|
|
case Expr::UnaryOperatorClass: {
|
|
const UnaryOperator *Exp = cast<UnaryOperator>(E);
|
|
switch (Exp->getOpcode()) {
|
|
case UnaryOperator::PostInc:
|
|
case UnaryOperator::PostDec:
|
|
case UnaryOperator::PreInc:
|
|
case UnaryOperator::PreDec:
|
|
case UnaryOperator::AddrOf:
|
|
case UnaryOperator::Deref:
|
|
return ICEDiag(2, E->getLocStart());
|
|
|
|
case UnaryOperator::Extension:
|
|
case UnaryOperator::LNot:
|
|
case UnaryOperator::Plus:
|
|
case UnaryOperator::Minus:
|
|
case UnaryOperator::Not:
|
|
case UnaryOperator::Real:
|
|
case UnaryOperator::Imag:
|
|
return CheckICE(Exp->getSubExpr(), Ctx);
|
|
case UnaryOperator::OffsetOf:
|
|
// Note that per C99, offsetof must be an ICE. And AFAIK, using
|
|
// Evaluate matches the proposed gcc behavior for cases like
|
|
// "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect
|
|
// compliance: we should warn earlier for offsetof expressions with
|
|
// array subscripts that aren't ICEs, and if the array subscripts
|
|
// are ICEs, the value of the offsetof must be an integer constant.
|
|
return CheckEvalInICE(E, Ctx);
|
|
}
|
|
}
|
|
case Expr::SizeOfAlignOfExprClass: {
|
|
const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E);
|
|
if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType())
|
|
return ICEDiag(2, E->getLocStart());
|
|
return NoDiag();
|
|
}
|
|
case Expr::BinaryOperatorClass: {
|
|
const BinaryOperator *Exp = cast<BinaryOperator>(E);
|
|
switch (Exp->getOpcode()) {
|
|
case BinaryOperator::PtrMemD:
|
|
case BinaryOperator::PtrMemI:
|
|
case BinaryOperator::Assign:
|
|
case BinaryOperator::MulAssign:
|
|
case BinaryOperator::DivAssign:
|
|
case BinaryOperator::RemAssign:
|
|
case BinaryOperator::AddAssign:
|
|
case BinaryOperator::SubAssign:
|
|
case BinaryOperator::ShlAssign:
|
|
case BinaryOperator::ShrAssign:
|
|
case BinaryOperator::AndAssign:
|
|
case BinaryOperator::XorAssign:
|
|
case BinaryOperator::OrAssign:
|
|
return ICEDiag(2, E->getLocStart());
|
|
|
|
case BinaryOperator::Mul:
|
|
case BinaryOperator::Div:
|
|
case BinaryOperator::Rem:
|
|
case BinaryOperator::Add:
|
|
case BinaryOperator::Sub:
|
|
case BinaryOperator::Shl:
|
|
case BinaryOperator::Shr:
|
|
case BinaryOperator::LT:
|
|
case BinaryOperator::GT:
|
|
case BinaryOperator::LE:
|
|
case BinaryOperator::GE:
|
|
case BinaryOperator::EQ:
|
|
case BinaryOperator::NE:
|
|
case BinaryOperator::And:
|
|
case BinaryOperator::Xor:
|
|
case BinaryOperator::Or:
|
|
case BinaryOperator::Comma: {
|
|
ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx);
|
|
ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx);
|
|
if (Exp->getOpcode() == BinaryOperator::Div ||
|
|
Exp->getOpcode() == BinaryOperator::Rem) {
|
|
// Evaluate gives an error for undefined Div/Rem, so make sure
|
|
// we don't evaluate one.
|
|
if (LHSResult.Val != 2 && RHSResult.Val != 2) {
|
|
llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx);
|
|
if (REval == 0)
|
|
return ICEDiag(1, E->getLocStart());
|
|
if (REval.isSigned() && REval.isAllOnesValue()) {
|
|
llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx);
|
|
if (LEval.isMinSignedValue())
|
|
return ICEDiag(1, E->getLocStart());
|
|
}
|
|
}
|
|
}
|
|
if (Exp->getOpcode() == BinaryOperator::Comma) {
|
|
if (Ctx.getLangOptions().C99) {
|
|
// C99 6.6p3 introduces a strange edge case: comma can be in an ICE
|
|
// if it isn't evaluated.
|
|
if (LHSResult.Val == 0 && RHSResult.Val == 0)
|
|
return ICEDiag(1, E->getLocStart());
|
|
} else {
|
|
// In both C89 and C++, commas in ICEs are illegal.
|
|
return ICEDiag(2, E->getLocStart());
|
|
}
|
|
}
|
|
if (LHSResult.Val >= RHSResult.Val)
|
|
return LHSResult;
|
|
return RHSResult;
|
|
}
|
|
case BinaryOperator::LAnd:
|
|
case BinaryOperator::LOr: {
|
|
ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx);
|
|
ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx);
|
|
if (LHSResult.Val == 0 && RHSResult.Val == 1) {
|
|
// Rare case where the RHS has a comma "side-effect"; we need
|
|
// to actually check the condition to see whether the side
|
|
// with the comma is evaluated.
|
|
if ((Exp->getOpcode() == BinaryOperator::LAnd) !=
|
|
(Exp->getLHS()->EvaluateAsInt(Ctx) == 0))
|
|
return RHSResult;
|
|
return NoDiag();
|
|
}
|
|
|
|
if (LHSResult.Val >= RHSResult.Val)
|
|
return LHSResult;
|
|
return RHSResult;
|
|
}
|
|
}
|
|
}
|
|
case Expr::CastExprClass:
|
|
case Expr::ImplicitCastExprClass:
|
|
case Expr::ExplicitCastExprClass:
|
|
case Expr::CStyleCastExprClass:
|
|
case Expr::CXXFunctionalCastExprClass:
|
|
case Expr::CXXNamedCastExprClass:
|
|
case Expr::CXXStaticCastExprClass:
|
|
case Expr::CXXReinterpretCastExprClass:
|
|
case Expr::CXXConstCastExprClass: {
|
|
const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr();
|
|
if (SubExpr->getType()->isIntegralType())
|
|
return CheckICE(SubExpr, Ctx);
|
|
if (isa<FloatingLiteral>(SubExpr->IgnoreParens()))
|
|
return NoDiag();
|
|
return ICEDiag(2, E->getLocStart());
|
|
}
|
|
case Expr::ConditionalOperatorClass: {
|
|
const ConditionalOperator *Exp = cast<ConditionalOperator>(E);
|
|
// If the condition (ignoring parens) is a __builtin_constant_p call,
|
|
// then only the true side is actually considered in an integer constant
|
|
// expression, and it is fully evaluated. This is an important GNU
|
|
// extension. See GCC PR38377 for discussion.
|
|
if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts()))
|
|
if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) {
|
|
Expr::EvalResult EVResult;
|
|
if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects ||
|
|
!EVResult.Val.isInt()) {
|
|
return ICEDiag(2, E->getLocStart());
|
|
}
|
|
return NoDiag();
|
|
}
|
|
ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx);
|
|
ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx);
|
|
ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx);
|
|
if (CondResult.Val == 2)
|
|
return CondResult;
|
|
if (TrueResult.Val == 2)
|
|
return TrueResult;
|
|
if (FalseResult.Val == 2)
|
|
return FalseResult;
|
|
if (CondResult.Val == 1)
|
|
return CondResult;
|
|
if (TrueResult.Val == 0 && FalseResult.Val == 0)
|
|
return NoDiag();
|
|
// Rare case where the diagnostics depend on which side is evaluated
|
|
// Note that if we get here, CondResult is 0, and at least one of
|
|
// TrueResult and FalseResult is non-zero.
|
|
if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) {
|
|
return FalseResult;
|
|
}
|
|
return TrueResult;
|
|
}
|
|
case Expr::CXXDefaultArgExprClass:
|
|
return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx);
|
|
case Expr::ChooseExprClass: {
|
|
return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx);
|
|
}
|
|
}
|
|
|
|
// Silence a GCC warning
|
|
return ICEDiag(2, E->getLocStart());
|
|
}
|
|
|
|
bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx,
|
|
SourceLocation *Loc, bool isEvaluated) const {
|
|
ICEDiag d = CheckICE(this, Ctx);
|
|
if (d.Val != 0) {
|
|
if (Loc) *Loc = d.Loc;
|
|
return false;
|
|
}
|
|
EvalResult EvalResult;
|
|
if (!Evaluate(EvalResult, Ctx))
|
|
assert(0 && "ICE cannot be evaluated!");
|
|
assert(!EvalResult.HasSideEffects && "ICE with side effects!");
|
|
assert(EvalResult.Val.isInt() && "ICE that isn't integer!");
|
|
Result = EvalResult.Val.getInt();
|
|
return true;
|
|
}
|
|
|
|
/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an
|
|
/// integer constant expression with the value zero, or if this is one that is
|
|
/// cast to void*.
|
|
bool Expr::isNullPointerConstant(ASTContext &Ctx) const {
|
|
// Ignore value dependent expressions.
|
|
assert(!isValueDependent() && "Unexpect value dependent expression!");
|
|
|
|
// Strip off a cast to void*, if it exists. Except in C++.
|
|
if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) {
|
|
if (!Ctx.getLangOptions().CPlusPlus) {
|
|
// Check that it is a cast to void*.
|
|
if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
|
|
QualType Pointee = PT->getPointeeType();
|
|
if (!Pointee.hasQualifiers() &&
|
|
Pointee->isVoidType() && // to void*
|
|
CE->getSubExpr()->getType()->isIntegerType()) // from int.
|
|
return CE->getSubExpr()->isNullPointerConstant(Ctx);
|
|
}
|
|
}
|
|
} else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) {
|
|
// Ignore the ImplicitCastExpr type entirely.
|
|
return ICE->getSubExpr()->isNullPointerConstant(Ctx);
|
|
} else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) {
|
|
// Accept ((void*)0) as a null pointer constant, as many other
|
|
// implementations do.
|
|
return PE->getSubExpr()->isNullPointerConstant(Ctx);
|
|
} else if (const CXXDefaultArgExpr *DefaultArg
|
|
= dyn_cast<CXXDefaultArgExpr>(this)) {
|
|
// See through default argument expressions
|
|
return DefaultArg->getExpr()->isNullPointerConstant(Ctx);
|
|
} else if (isa<GNUNullExpr>(this)) {
|
|
// The GNU __null extension is always a null pointer constant.
|
|
return true;
|
|
}
|
|
|
|
// C++0x nullptr_t is always a null pointer constant.
|
|
if (getType()->isNullPtrType())
|
|
return true;
|
|
|
|
// This expression must be an integer type.
|
|
if (!getType()->isIntegerType())
|
|
return false;
|
|
|
|
// If we have an integer constant expression, we need to *evaluate* it and
|
|
// test for the value 0.
|
|
llvm::APSInt Result;
|
|
return isIntegerConstantExpr(Result, Ctx) && Result == 0;
|
|
}
|
|
|
|
FieldDecl *Expr::getBitField() {
|
|
Expr *E = this->IgnoreParens();
|
|
|
|
if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E))
|
|
if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl()))
|
|
if (Field->isBitField())
|
|
return Field;
|
|
|
|
if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E))
|
|
if (BinOp->isAssignmentOp() && BinOp->getLHS())
|
|
return BinOp->getLHS()->getBitField();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/// isArrow - Return true if the base expression is a pointer to vector,
|
|
/// return false if the base expression is a vector.
|
|
bool ExtVectorElementExpr::isArrow() const {
|
|
return getBase()->getType()->isPointerType();
|
|
}
|
|
|
|
unsigned ExtVectorElementExpr::getNumElements() const {
|
|
if (const VectorType *VT = getType()->getAs<VectorType>())
|
|
return VT->getNumElements();
|
|
return 1;
|
|
}
|
|
|
|
/// containsDuplicateElements - Return true if any element access is repeated.
|
|
bool ExtVectorElementExpr::containsDuplicateElements() const {
|
|
const char *compStr = Accessor->getName();
|
|
unsigned length = Accessor->getLength();
|
|
|
|
// Halving swizzles do not contain duplicate elements.
|
|
if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") ||
|
|
!strcmp(compStr, "even") || !strcmp(compStr, "odd"))
|
|
return false;
|
|
|
|
// Advance past s-char prefix on hex swizzles.
|
|
if (*compStr == 's' || *compStr == 'S') {
|
|
compStr++;
|
|
length--;
|
|
}
|
|
|
|
for (unsigned i = 0; i != length-1; i++) {
|
|
const char *s = compStr+i;
|
|
for (const char c = *s++; *s; s++)
|
|
if (c == *s)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
|
|
void ExtVectorElementExpr::getEncodedElementAccess(
|
|
llvm::SmallVectorImpl<unsigned> &Elts) const {
|
|
const char *compStr = Accessor->getName();
|
|
if (*compStr == 's' || *compStr == 'S')
|
|
compStr++;
|
|
|
|
bool isHi = !strcmp(compStr, "hi");
|
|
bool isLo = !strcmp(compStr, "lo");
|
|
bool isEven = !strcmp(compStr, "even");
|
|
bool isOdd = !strcmp(compStr, "odd");
|
|
|
|
for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
|
|
uint64_t Index;
|
|
|
|
if (isHi)
|
|
Index = e + i;
|
|
else if (isLo)
|
|
Index = i;
|
|
else if (isEven)
|
|
Index = 2 * i;
|
|
else if (isOdd)
|
|
Index = 2 * i + 1;
|
|
else
|
|
Index = ExtVectorType::getAccessorIdx(compStr[i]);
|
|
|
|
Elts.push_back(Index);
|
|
}
|
|
}
|
|
|
|
// constructor for instance messages.
|
|
ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo,
|
|
QualType retType, ObjCMethodDecl *mproto,
|
|
SourceLocation LBrac, SourceLocation RBrac,
|
|
Expr **ArgExprs, unsigned nargs)
|
|
: Expr(ObjCMessageExprClass, retType), SelName(selInfo),
|
|
MethodProto(mproto) {
|
|
NumArgs = nargs;
|
|
SubExprs = new Stmt*[NumArgs+1];
|
|
SubExprs[RECEIVER] = receiver;
|
|
if (NumArgs) {
|
|
for (unsigned i = 0; i != NumArgs; ++i)
|
|
SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
|
|
}
|
|
LBracloc = LBrac;
|
|
RBracloc = RBrac;
|
|
}
|
|
|
|
// constructor for class messages.
|
|
// FIXME: clsName should be typed to ObjCInterfaceType
|
|
ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo,
|
|
QualType retType, ObjCMethodDecl *mproto,
|
|
SourceLocation LBrac, SourceLocation RBrac,
|
|
Expr **ArgExprs, unsigned nargs)
|
|
: Expr(ObjCMessageExprClass, retType), SelName(selInfo),
|
|
MethodProto(mproto) {
|
|
NumArgs = nargs;
|
|
SubExprs = new Stmt*[NumArgs+1];
|
|
SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown);
|
|
if (NumArgs) {
|
|
for (unsigned i = 0; i != NumArgs; ++i)
|
|
SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
|
|
}
|
|
LBracloc = LBrac;
|
|
RBracloc = RBrac;
|
|
}
|
|
|
|
// constructor for class messages.
|
|
ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo,
|
|
QualType retType, ObjCMethodDecl *mproto,
|
|
SourceLocation LBrac, SourceLocation RBrac,
|
|
Expr **ArgExprs, unsigned nargs)
|
|
: Expr(ObjCMessageExprClass, retType), SelName(selInfo),
|
|
MethodProto(mproto) {
|
|
NumArgs = nargs;
|
|
SubExprs = new Stmt*[NumArgs+1];
|
|
SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown);
|
|
if (NumArgs) {
|
|
for (unsigned i = 0; i != NumArgs; ++i)
|
|
SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
|
|
}
|
|
LBracloc = LBrac;
|
|
RBracloc = RBrac;
|
|
}
|
|
|
|
ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const {
|
|
uintptr_t x = (uintptr_t) SubExprs[RECEIVER];
|
|
switch (x & Flags) {
|
|
default:
|
|
assert(false && "Invalid ObjCMessageExpr.");
|
|
case IsInstMeth:
|
|
return ClassInfo(0, 0);
|
|
case IsClsMethDeclUnknown:
|
|
return ClassInfo(0, (IdentifierInfo*) (x & ~Flags));
|
|
case IsClsMethDeclKnown: {
|
|
ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags);
|
|
return ClassInfo(D, D->getIdentifier());
|
|
}
|
|
}
|
|
}
|
|
|
|
void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) {
|
|
if (CI.first == 0 && CI.second == 0)
|
|
SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth);
|
|
else if (CI.first == 0)
|
|
SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown);
|
|
else
|
|
SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown);
|
|
}
|
|
|
|
|
|
bool ChooseExpr::isConditionTrue(ASTContext &C) const {
|
|
return getCond()->EvaluateAsInt(C) != 0;
|
|
}
|
|
|
|
void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs,
|
|
unsigned NumExprs) {
|
|
if (SubExprs) C.Deallocate(SubExprs);
|
|
|
|
SubExprs = new (C) Stmt* [NumExprs];
|
|
this->NumExprs = NumExprs;
|
|
memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs);
|
|
}
|
|
|
|
void ShuffleVectorExpr::DoDestroy(ASTContext& C) {
|
|
DestroyChildren(C);
|
|
if (SubExprs) C.Deallocate(SubExprs);
|
|
this->~ShuffleVectorExpr();
|
|
C.Deallocate(this);
|
|
}
|
|
|
|
void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) {
|
|
// Override default behavior of traversing children. If this has a type
|
|
// operand and the type is a variable-length array, the child iteration
|
|
// will iterate over the size expression. However, this expression belongs
|
|
// to the type, not to this, so we don't want to delete it.
|
|
// We still want to delete this expression.
|
|
if (isArgumentType()) {
|
|
this->~SizeOfAlignOfExpr();
|
|
C.Deallocate(this);
|
|
}
|
|
else
|
|
Expr::DoDestroy(C);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// DesignatedInitExpr
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() {
|
|
assert(Kind == FieldDesignator && "Only valid on a field designator");
|
|
if (Field.NameOrField & 0x01)
|
|
return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01);
|
|
else
|
|
return getField()->getIdentifier();
|
|
}
|
|
|
|
DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators,
|
|
const Designator *Designators,
|
|
SourceLocation EqualOrColonLoc,
|
|
bool GNUSyntax,
|
|
Expr **IndexExprs,
|
|
unsigned NumIndexExprs,
|
|
Expr *Init)
|
|
: Expr(DesignatedInitExprClass, Ty,
|
|
Init->isTypeDependent(), Init->isValueDependent()),
|
|
EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
|
|
NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) {
|
|
this->Designators = new Designator[NumDesignators];
|
|
|
|
// Record the initializer itself.
|
|
child_iterator Child = child_begin();
|
|
*Child++ = Init;
|
|
|
|
// Copy the designators and their subexpressions, computing
|
|
// value-dependence along the way.
|
|
unsigned IndexIdx = 0;
|
|
for (unsigned I = 0; I != NumDesignators; ++I) {
|
|
this->Designators[I] = Designators[I];
|
|
|
|
if (this->Designators[I].isArrayDesignator()) {
|
|
// Compute type- and value-dependence.
|
|
Expr *Index = IndexExprs[IndexIdx];
|
|
ValueDependent = ValueDependent ||
|
|
Index->isTypeDependent() || Index->isValueDependent();
|
|
|
|
// Copy the index expressions into permanent storage.
|
|
*Child++ = IndexExprs[IndexIdx++];
|
|
} else if (this->Designators[I].isArrayRangeDesignator()) {
|
|
// Compute type- and value-dependence.
|
|
Expr *Start = IndexExprs[IndexIdx];
|
|
Expr *End = IndexExprs[IndexIdx + 1];
|
|
ValueDependent = ValueDependent ||
|
|
Start->isTypeDependent() || Start->isValueDependent() ||
|
|
End->isTypeDependent() || End->isValueDependent();
|
|
|
|
// Copy the start/end expressions into permanent storage.
|
|
*Child++ = IndexExprs[IndexIdx++];
|
|
*Child++ = IndexExprs[IndexIdx++];
|
|
}
|
|
}
|
|
|
|
assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions");
|
|
}
|
|
|
|
DesignatedInitExpr *
|
|
DesignatedInitExpr::Create(ASTContext &C, Designator *Designators,
|
|
unsigned NumDesignators,
|
|
Expr **IndexExprs, unsigned NumIndexExprs,
|
|
SourceLocation ColonOrEqualLoc,
|
|
bool UsesColonSyntax, Expr *Init) {
|
|
void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
|
|
sizeof(Stmt *) * (NumIndexExprs + 1), 8);
|
|
return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators,
|
|
ColonOrEqualLoc, UsesColonSyntax,
|
|
IndexExprs, NumIndexExprs, Init);
|
|
}
|
|
|
|
DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C,
|
|
unsigned NumIndexExprs) {
|
|
void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
|
|
sizeof(Stmt *) * (NumIndexExprs + 1), 8);
|
|
return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
|
|
}
|
|
|
|
void DesignatedInitExpr::setDesignators(const Designator *Desigs,
|
|
unsigned NumDesigs) {
|
|
if (Designators)
|
|
delete [] Designators;
|
|
|
|
Designators = new Designator[NumDesigs];
|
|
NumDesignators = NumDesigs;
|
|
for (unsigned I = 0; I != NumDesigs; ++I)
|
|
Designators[I] = Desigs[I];
|
|
}
|
|
|
|
SourceRange DesignatedInitExpr::getSourceRange() const {
|
|
SourceLocation StartLoc;
|
|
Designator &First =
|
|
*const_cast<DesignatedInitExpr*>(this)->designators_begin();
|
|
if (First.isFieldDesignator()) {
|
|
if (GNUSyntax)
|
|
StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc);
|
|
else
|
|
StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc);
|
|
} else
|
|
StartLoc =
|
|
SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc);
|
|
return SourceRange(StartLoc, getInit()->getSourceRange().getEnd());
|
|
}
|
|
|
|
Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) {
|
|
assert(D.Kind == Designator::ArrayDesignator && "Requires array designator");
|
|
char* Ptr = static_cast<char*>(static_cast<void *>(this));
|
|
Ptr += sizeof(DesignatedInitExpr);
|
|
Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
|
|
return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
|
|
}
|
|
|
|
Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) {
|
|
assert(D.Kind == Designator::ArrayRangeDesignator &&
|
|
"Requires array range designator");
|
|
char* Ptr = static_cast<char*>(static_cast<void *>(this));
|
|
Ptr += sizeof(DesignatedInitExpr);
|
|
Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
|
|
return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
|
|
}
|
|
|
|
Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) {
|
|
assert(D.Kind == Designator::ArrayRangeDesignator &&
|
|
"Requires array range designator");
|
|
char* Ptr = static_cast<char*>(static_cast<void *>(this));
|
|
Ptr += sizeof(DesignatedInitExpr);
|
|
Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
|
|
return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2));
|
|
}
|
|
|
|
/// \brief Replaces the designator at index @p Idx with the series
|
|
/// of designators in [First, Last).
|
|
void DesignatedInitExpr::ExpandDesignator(unsigned Idx,
|
|
const Designator *First,
|
|
const Designator *Last) {
|
|
unsigned NumNewDesignators = Last - First;
|
|
if (NumNewDesignators == 0) {
|
|
std::copy_backward(Designators + Idx + 1,
|
|
Designators + NumDesignators,
|
|
Designators + Idx);
|
|
--NumNewDesignators;
|
|
return;
|
|
} else if (NumNewDesignators == 1) {
|
|
Designators[Idx] = *First;
|
|
return;
|
|
}
|
|
|
|
Designator *NewDesignators
|
|
= new Designator[NumDesignators - 1 + NumNewDesignators];
|
|
std::copy(Designators, Designators + Idx, NewDesignators);
|
|
std::copy(First, Last, NewDesignators + Idx);
|
|
std::copy(Designators + Idx + 1, Designators + NumDesignators,
|
|
NewDesignators + Idx + NumNewDesignators);
|
|
delete [] Designators;
|
|
Designators = NewDesignators;
|
|
NumDesignators = NumDesignators - 1 + NumNewDesignators;
|
|
}
|
|
|
|
void DesignatedInitExpr::DoDestroy(ASTContext &C) {
|
|
delete [] Designators;
|
|
Expr::DoDestroy(C);
|
|
}
|
|
|
|
ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc,
|
|
Expr **exprs, unsigned nexprs,
|
|
SourceLocation rparenloc)
|
|
: Expr(ParenListExprClass, QualType(),
|
|
hasAnyTypeDependentArguments(exprs, nexprs),
|
|
hasAnyValueDependentArguments(exprs, nexprs)),
|
|
NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) {
|
|
|
|
Exprs = new (C) Stmt*[nexprs];
|
|
for (unsigned i = 0; i != nexprs; ++i)
|
|
Exprs[i] = exprs[i];
|
|
}
|
|
|
|
void ParenListExpr::DoDestroy(ASTContext& C) {
|
|
DestroyChildren(C);
|
|
if (Exprs) C.Deallocate(Exprs);
|
|
this->~ParenListExpr();
|
|
C.Deallocate(this);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// ExprIterator.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); }
|
|
Expr* ExprIterator::operator*() const { return cast<Expr>(*I); }
|
|
Expr* ExprIterator::operator->() const { return cast<Expr>(*I); }
|
|
const Expr* ConstExprIterator::operator[](size_t idx) const {
|
|
return cast<Expr>(I[idx]);
|
|
}
|
|
const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); }
|
|
const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); }
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Child Iterators for iterating over subexpressions/substatements
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// DeclRefExpr
|
|
Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); }
|
|
Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); }
|
|
|
|
// ObjCIvarRefExpr
|
|
Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; }
|
|
Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; }
|
|
|
|
// ObjCPropertyRefExpr
|
|
Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; }
|
|
Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; }
|
|
|
|
// ObjCImplicitSetterGetterRefExpr
|
|
Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() {
|
|
return &Base;
|
|
}
|
|
Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() {
|
|
return &Base+1;
|
|
}
|
|
|
|
// ObjCSuperExpr
|
|
Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); }
|
|
Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); }
|
|
|
|
// ObjCIsaExpr
|
|
Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; }
|
|
Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; }
|
|
|
|
// PredefinedExpr
|
|
Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); }
|
|
Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); }
|
|
|
|
// IntegerLiteral
|
|
Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); }
|
|
Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); }
|
|
|
|
// CharacterLiteral
|
|
Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();}
|
|
Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); }
|
|
|
|
// FloatingLiteral
|
|
Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); }
|
|
Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); }
|
|
|
|
// ImaginaryLiteral
|
|
Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; }
|
|
Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; }
|
|
|
|
// StringLiteral
|
|
Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); }
|
|
Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); }
|
|
|
|
// ParenExpr
|
|
Stmt::child_iterator ParenExpr::child_begin() { return &Val; }
|
|
Stmt::child_iterator ParenExpr::child_end() { return &Val+1; }
|
|
|
|
// UnaryOperator
|
|
Stmt::child_iterator UnaryOperator::child_begin() { return &Val; }
|
|
Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; }
|
|
|
|
// SizeOfAlignOfExpr
|
|
Stmt::child_iterator SizeOfAlignOfExpr::child_begin() {
|
|
// If this is of a type and the type is a VLA type (and not a typedef), the
|
|
// size expression of the VLA needs to be treated as an executable expression.
|
|
// Why isn't this weirdness documented better in StmtIterator?
|
|
if (isArgumentType()) {
|
|
if (VariableArrayType* T = dyn_cast<VariableArrayType>(
|
|
getArgumentType().getTypePtr()))
|
|
return child_iterator(T);
|
|
return child_iterator();
|
|
}
|
|
return child_iterator(&Argument.Ex);
|
|
}
|
|
Stmt::child_iterator SizeOfAlignOfExpr::child_end() {
|
|
if (isArgumentType())
|
|
return child_iterator();
|
|
return child_iterator(&Argument.Ex + 1);
|
|
}
|
|
|
|
// ArraySubscriptExpr
|
|
Stmt::child_iterator ArraySubscriptExpr::child_begin() {
|
|
return &SubExprs[0];
|
|
}
|
|
Stmt::child_iterator ArraySubscriptExpr::child_end() {
|
|
return &SubExprs[0]+END_EXPR;
|
|
}
|
|
|
|
// CallExpr
|
|
Stmt::child_iterator CallExpr::child_begin() {
|
|
return &SubExprs[0];
|
|
}
|
|
Stmt::child_iterator CallExpr::child_end() {
|
|
return &SubExprs[0]+NumArgs+ARGS_START;
|
|
}
|
|
|
|
// MemberExpr
|
|
Stmt::child_iterator MemberExpr::child_begin() { return &Base; }
|
|
Stmt::child_iterator MemberExpr::child_end() { return &Base+1; }
|
|
|
|
// ExtVectorElementExpr
|
|
Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; }
|
|
Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; }
|
|
|
|
// CompoundLiteralExpr
|
|
Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; }
|
|
Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; }
|
|
|
|
// CastExpr
|
|
Stmt::child_iterator CastExpr::child_begin() { return &Op; }
|
|
Stmt::child_iterator CastExpr::child_end() { return &Op+1; }
|
|
|
|
// BinaryOperator
|
|
Stmt::child_iterator BinaryOperator::child_begin() {
|
|
return &SubExprs[0];
|
|
}
|
|
Stmt::child_iterator BinaryOperator::child_end() {
|
|
return &SubExprs[0]+END_EXPR;
|
|
}
|
|
|
|
// ConditionalOperator
|
|
Stmt::child_iterator ConditionalOperator::child_begin() {
|
|
return &SubExprs[0];
|
|
}
|
|
Stmt::child_iterator ConditionalOperator::child_end() {
|
|
return &SubExprs[0]+END_EXPR;
|
|
}
|
|
|
|
// AddrLabelExpr
|
|
Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); }
|
|
Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); }
|
|
|
|
// StmtExpr
|
|
Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; }
|
|
Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; }
|
|
|
|
// TypesCompatibleExpr
|
|
Stmt::child_iterator TypesCompatibleExpr::child_begin() {
|
|
return child_iterator();
|
|
}
|
|
|
|
Stmt::child_iterator TypesCompatibleExpr::child_end() {
|
|
return child_iterator();
|
|
}
|
|
|
|
// ChooseExpr
|
|
Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; }
|
|
Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; }
|
|
|
|
// GNUNullExpr
|
|
Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); }
|
|
Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); }
|
|
|
|
// ShuffleVectorExpr
|
|
Stmt::child_iterator ShuffleVectorExpr::child_begin() {
|
|
return &SubExprs[0];
|
|
}
|
|
Stmt::child_iterator ShuffleVectorExpr::child_end() {
|
|
return &SubExprs[0]+NumExprs;
|
|
}
|
|
|
|
// VAArgExpr
|
|
Stmt::child_iterator VAArgExpr::child_begin() { return &Val; }
|
|
Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; }
|
|
|
|
// InitListExpr
|
|
Stmt::child_iterator InitListExpr::child_begin() {
|
|
return InitExprs.size() ? &InitExprs[0] : 0;
|
|
}
|
|
Stmt::child_iterator InitListExpr::child_end() {
|
|
return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0;
|
|
}
|
|
|
|
// DesignatedInitExpr
|
|
Stmt::child_iterator DesignatedInitExpr::child_begin() {
|
|
char* Ptr = static_cast<char*>(static_cast<void *>(this));
|
|
Ptr += sizeof(DesignatedInitExpr);
|
|
return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
|
|
}
|
|
Stmt::child_iterator DesignatedInitExpr::child_end() {
|
|
return child_iterator(&*child_begin() + NumSubExprs);
|
|
}
|
|
|
|
// ImplicitValueInitExpr
|
|
Stmt::child_iterator ImplicitValueInitExpr::child_begin() {
|
|
return child_iterator();
|
|
}
|
|
|
|
Stmt::child_iterator ImplicitValueInitExpr::child_end() {
|
|
return child_iterator();
|
|
}
|
|
|
|
// ParenListExpr
|
|
Stmt::child_iterator ParenListExpr::child_begin() {
|
|
return &Exprs[0];
|
|
}
|
|
Stmt::child_iterator ParenListExpr::child_end() {
|
|
return &Exprs[0]+NumExprs;
|
|
}
|
|
|
|
// ObjCStringLiteral
|
|
Stmt::child_iterator ObjCStringLiteral::child_begin() {
|
|
return &String;
|
|
}
|
|
Stmt::child_iterator ObjCStringLiteral::child_end() {
|
|
return &String+1;
|
|
}
|
|
|
|
// ObjCEncodeExpr
|
|
Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); }
|
|
Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); }
|
|
|
|
// ObjCSelectorExpr
|
|
Stmt::child_iterator ObjCSelectorExpr::child_begin() {
|
|
return child_iterator();
|
|
}
|
|
Stmt::child_iterator ObjCSelectorExpr::child_end() {
|
|
return child_iterator();
|
|
}
|
|
|
|
// ObjCProtocolExpr
|
|
Stmt::child_iterator ObjCProtocolExpr::child_begin() {
|
|
return child_iterator();
|
|
}
|
|
Stmt::child_iterator ObjCProtocolExpr::child_end() {
|
|
return child_iterator();
|
|
}
|
|
|
|
// ObjCMessageExpr
|
|
Stmt::child_iterator ObjCMessageExpr::child_begin() {
|
|
return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START;
|
|
}
|
|
Stmt::child_iterator ObjCMessageExpr::child_end() {
|
|
return &SubExprs[0]+ARGS_START+getNumArgs();
|
|
}
|
|
|
|
// Blocks
|
|
Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); }
|
|
Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); }
|
|
|
|
Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();}
|
|
Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); }
|