blob: 868109e3d56e00eef22077411deff90c20ac2bed [file] [log] [blame]
//===--- Expr.cpp - Expression AST Node Implementation --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Expr class and subclasses.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/APValue.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/EvaluatedExprVisitor.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Lex/LiteralSupport.h"
#include "clang/Lex/Lexer.h"
#include "clang/Sema/SemaDiagnostic.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstring>
using namespace clang;
/// isKnownToHaveBooleanValue - Return true if this is an integer expression
/// that is known to return 0 or 1. This happens for _Bool/bool expressions
/// but also int expressions which are produced by things like comparisons in
/// C.
bool Expr::isKnownToHaveBooleanValue() const {
const Expr *E = IgnoreParens();
// If this value has _Bool type, it is obvious 0/1.
if (E->getType()->isBooleanType()) return true;
// If this is a non-scalar-integer type, we don't care enough to try.
if (!E->getType()->isIntegralOrEnumerationType()) return false;
if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
switch (UO->getOpcode()) {
case UO_Plus:
return UO->getSubExpr()->isKnownToHaveBooleanValue();
default:
return false;
}
}
// Only look through implicit casts. If the user writes
// '(int) (a && b)' treat it as an arbitrary int.
if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E))
return CE->getSubExpr()->isKnownToHaveBooleanValue();
if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
switch (BO->getOpcode()) {
default: return false;
case BO_LT: // Relational operators.
case BO_GT:
case BO_LE:
case BO_GE:
case BO_EQ: // Equality operators.
case BO_NE:
case BO_LAnd: // AND operator.
case BO_LOr: // Logical OR operator.
return true;
case BO_And: // Bitwise AND operator.
case BO_Xor: // Bitwise XOR operator.
case BO_Or: // Bitwise OR operator.
// Handle things like (x==2)|(y==12).
return BO->getLHS()->isKnownToHaveBooleanValue() &&
BO->getRHS()->isKnownToHaveBooleanValue();
case BO_Comma:
case BO_Assign:
return BO->getRHS()->isKnownToHaveBooleanValue();
}
}
if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E))
return CO->getTrueExpr()->isKnownToHaveBooleanValue() &&
CO->getFalseExpr()->isKnownToHaveBooleanValue();
return false;
}
// Amusing macro metaprogramming hack: check whether a class provides
// a more specific implementation of getExprLoc().
//
// See also Stmt.cpp:{getLocStart(),getLocEnd()}.
namespace {
/// This implementation is used when a class provides a custom
/// implementation of getExprLoc.
template <class E, class T>
SourceLocation getExprLocImpl(const Expr *expr,
SourceLocation (T::*v)() const) {
return static_cast<const E*>(expr)->getExprLoc();
}
/// This implementation is used when a class doesn't provide
/// a custom implementation of getExprLoc. Overload resolution
/// should pick it over the implementation above because it's
/// more specialized according to function template partial ordering.
template <class E>
SourceLocation getExprLocImpl(const Expr *expr,
SourceLocation (Expr::*v)() const) {
return static_cast<const E*>(expr)->getLocStart();
}
}
SourceLocation Expr::getExprLoc() const {
switch (getStmtClass()) {
case Stmt::NoStmtClass: llvm_unreachable("statement without class");
#define ABSTRACT_STMT(type)
#define STMT(type, base) \
case Stmt::type##Class: llvm_unreachable(#type " is not an Expr"); break;
#define EXPR(type, base) \
case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc);
#include "clang/AST/StmtNodes.inc"
}
llvm_unreachable("unknown statement kind");
}
//===----------------------------------------------------------------------===//
// Primary Expressions.
//===----------------------------------------------------------------------===//
/// \brief Compute the type-, value-, and instantiation-dependence of a
/// declaration reference
/// based on the declaration being referenced.
static void computeDeclRefDependence(ASTContext &Ctx, NamedDecl *D, QualType T,
bool &TypeDependent,
bool &ValueDependent,
bool &InstantiationDependent) {
TypeDependent = false;
ValueDependent = false;
InstantiationDependent = false;
// (TD) C++ [temp.dep.expr]p3:
// An id-expression is type-dependent if it contains:
//
// and
//
// (VD) C++ [temp.dep.constexpr]p2:
// An identifier is value-dependent if it is:
// (TD) - an identifier that was declared with dependent type
// (VD) - a name declared with a dependent type,
if (T->isDependentType()) {
TypeDependent = true;
ValueDependent = true;
InstantiationDependent = true;
return;
} else if (T->isInstantiationDependentType()) {
InstantiationDependent = true;
}
// (TD) - a conversion-function-id that specifies a dependent type
if (D->getDeclName().getNameKind()
== DeclarationName::CXXConversionFunctionName) {
QualType T = D->getDeclName().getCXXNameType();
if (T->isDependentType()) {
TypeDependent = true;
ValueDependent = true;
InstantiationDependent = true;
return;
}
if (T->isInstantiationDependentType())
InstantiationDependent = true;
}
// (VD) - the name of a non-type template parameter,
if (isa<NonTypeTemplateParmDecl>(D)) {
ValueDependent = true;
InstantiationDependent = true;
return;
}
// (VD) - a constant with integral or enumeration type and is
// initialized with an expression that is value-dependent.
// (VD) - a constant with literal type and is initialized with an
// expression that is value-dependent [C++11].
// (VD) - FIXME: Missing from the standard:
// - an entity with reference type and is initialized with an
// expression that is value-dependent [C++11]
if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
if ((Ctx.getLangOpts().CPlusPlus0x ?
Var->getType()->isLiteralType() :
Var->getType()->isIntegralOrEnumerationType()) &&
(Var->getType().getCVRQualifiers() == Qualifiers::Const ||
Var->getType()->isReferenceType())) {
if (const Expr *Init = Var->getAnyInitializer())
if (Init->isValueDependent()) {
ValueDependent = true;
InstantiationDependent = true;
}
}
// (VD) - FIXME: Missing from the standard:
// - a member function or a static data member of the current
// instantiation
if (Var->isStaticDataMember() &&
Var->getDeclContext()->isDependentContext()) {
ValueDependent = true;
InstantiationDependent = true;
}
return;
}
// (VD) - FIXME: Missing from the standard:
// - a member function or a static data member of the current
// instantiation
if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) {
ValueDependent = true;
InstantiationDependent = true;
}
}
void DeclRefExpr::computeDependence(ASTContext &Ctx) {
bool TypeDependent = false;
bool ValueDependent = false;
bool InstantiationDependent = false;
computeDeclRefDependence(Ctx, getDecl(), getType(), TypeDependent,
ValueDependent, InstantiationDependent);
// (TD) C++ [temp.dep.expr]p3:
// An id-expression is type-dependent if it contains:
//
// and
//
// (VD) C++ [temp.dep.constexpr]p2:
// An identifier is value-dependent if it is:
if (!TypeDependent && !ValueDependent &&
hasExplicitTemplateArgs() &&
TemplateSpecializationType::anyDependentTemplateArguments(
getTemplateArgs(),
getNumTemplateArgs(),
InstantiationDependent)) {
TypeDependent = true;
ValueDependent = true;
InstantiationDependent = true;
}
ExprBits.TypeDependent = TypeDependent;
ExprBits.ValueDependent = ValueDependent;
ExprBits.InstantiationDependent = InstantiationDependent;
// Is the declaration a parameter pack?
if (getDecl()->isParameterPack())
ExprBits.ContainsUnexpandedParameterPack = true;
}
DeclRefExpr::DeclRefExpr(ASTContext &Ctx,
NestedNameSpecifierLoc QualifierLoc,
SourceLocation TemplateKWLoc,
ValueDecl *D, bool RefersToEnclosingLocal,
const DeclarationNameInfo &NameInfo,
NamedDecl *FoundD,
const TemplateArgumentListInfo *TemplateArgs,
QualType T, ExprValueKind VK)
: Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false),
D(D), Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) {
DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0;
if (QualifierLoc)
getInternalQualifierLoc() = QualifierLoc;
DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0;
if (FoundD)
getInternalFoundDecl() = FoundD;
DeclRefExprBits.HasTemplateKWAndArgsInfo
= (TemplateArgs || TemplateKWLoc.isValid()) ? 1 : 0;
DeclRefExprBits.RefersToEnclosingLocal = RefersToEnclosingLocal;
if (TemplateArgs) {
bool Dependent = false;
bool InstantiationDependent = false;
bool ContainsUnexpandedParameterPack = false;
getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc, *TemplateArgs,
Dependent,
InstantiationDependent,
ContainsUnexpandedParameterPack);
if (InstantiationDependent)
setInstantiationDependent(true);
} else if (TemplateKWLoc.isValid()) {
getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc);
}
DeclRefExprBits.HadMultipleCandidates = 0;
computeDependence(Ctx);
}
DeclRefExpr *DeclRefExpr::Create(ASTContext &Context,
NestedNameSpecifierLoc QualifierLoc,
SourceLocation TemplateKWLoc,
ValueDecl *D,
bool RefersToEnclosingLocal,
SourceLocation NameLoc,
QualType T,
ExprValueKind VK,
NamedDecl *FoundD,
const TemplateArgumentListInfo *TemplateArgs) {
return Create(Context, QualifierLoc, TemplateKWLoc, D,
RefersToEnclosingLocal,
DeclarationNameInfo(D->getDeclName(), NameLoc),
T, VK, FoundD, TemplateArgs);
}
DeclRefExpr *DeclRefExpr::Create(ASTContext &Context,
NestedNameSpecifierLoc QualifierLoc,
SourceLocation TemplateKWLoc,
ValueDecl *D,
bool RefersToEnclosingLocal,
const DeclarationNameInfo &NameInfo,
QualType T,
ExprValueKind VK,
NamedDecl *FoundD,
const TemplateArgumentListInfo *TemplateArgs) {
// Filter out cases where the found Decl is the same as the value refenenced.
if (D == FoundD)
FoundD = 0;
std::size_t Size = sizeof(DeclRefExpr);
if (QualifierLoc != 0)
Size += sizeof(NestedNameSpecifierLoc);
if (FoundD)
Size += sizeof(NamedDecl *);
if (TemplateArgs)
Size += ASTTemplateKWAndArgsInfo::sizeFor(TemplateArgs->size());
else if (TemplateKWLoc.isValid())
Size += ASTTemplateKWAndArgsInfo::sizeFor(0);
void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>());
return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D,
RefersToEnclosingLocal,
NameInfo, FoundD, TemplateArgs, T, VK);
}
DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context,
bool HasQualifier,
bool HasFoundDecl,
bool HasTemplateKWAndArgsInfo,
unsigned NumTemplateArgs) {
std::size_t Size = sizeof(DeclRefExpr);
if (HasQualifier)
Size += sizeof(NestedNameSpecifierLoc);
if (HasFoundDecl)
Size += sizeof(NamedDecl *);
if (HasTemplateKWAndArgsInfo)
Size += ASTTemplateKWAndArgsInfo::sizeFor(NumTemplateArgs);
void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>());
return new (Mem) DeclRefExpr(EmptyShell());
}
SourceRange DeclRefExpr::getSourceRange() const {
SourceRange R = getNameInfo().getSourceRange();
if (hasQualifier())
R.setBegin(getQualifierLoc().getBeginLoc());
if (hasExplicitTemplateArgs())
R.setEnd(getRAngleLoc());
return R;
}
SourceLocation DeclRefExpr::getLocStart() const {
if (hasQualifier())
return getQualifierLoc().getBeginLoc();
return getNameInfo().getLocStart();
}
SourceLocation DeclRefExpr::getLocEnd() const {
if (hasExplicitTemplateArgs())
return getRAngleLoc();
return getNameInfo().getLocEnd();
}
// FIXME: Maybe this should use DeclPrinter with a special "print predefined
// expr" policy instead.
std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) {
ASTContext &Context = CurrentDecl->getASTContext();
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) {
if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual)
return FD->getNameAsString();
SmallString<256> Name;
llvm::raw_svector_ostream Out(Name);
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
if (MD->isVirtual() && IT != PrettyFunctionNoVirtual)
Out << "virtual ";
if (MD->isStatic())
Out << "static ";
}
PrintingPolicy Policy(Context.getLangOpts());
std::string Proto = FD->getQualifiedNameAsString(Policy);
llvm::raw_string_ostream POut(Proto);
const FunctionDecl *Decl = FD;
if (const FunctionDecl* Pattern = FD->getTemplateInstantiationPattern())
Decl = Pattern;
const FunctionType *AFT = Decl->getType()->getAs<FunctionType>();
const FunctionProtoType *FT = 0;
if (FD->hasWrittenPrototype())
FT = dyn_cast<FunctionProtoType>(AFT);
POut << "(";
if (FT) {
for (unsigned i = 0, e = Decl->getNumParams(); i != e; ++i) {
if (i) POut << ", ";
std::string Param;
Decl->getParamDecl(i)->getType().getAsStringInternal(Param, Policy);
POut << Param;
}
if (FT->isVariadic()) {
if (FD->getNumParams()) POut << ", ";
POut << "...";
}
}
POut << ")";
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers());
if (ThisQuals.hasConst())
POut << " const";
if (ThisQuals.hasVolatile())
POut << " volatile";
RefQualifierKind Ref = MD->getRefQualifier();
if (Ref == RQ_LValue)
POut << " &";
else if (Ref == RQ_RValue)
POut << " &&";
}
typedef SmallVector<const ClassTemplateSpecializationDecl *, 8> SpecsTy;
SpecsTy Specs;
const DeclContext *Ctx = FD->getDeclContext();
while (Ctx && isa<NamedDecl>(Ctx)) {
const ClassTemplateSpecializationDecl *Spec
= dyn_cast<ClassTemplateSpecializationDecl>(Ctx);
if (Spec && !Spec->isExplicitSpecialization())
Specs.push_back(Spec);
Ctx = Ctx->getParent();
}
std::string TemplateParams;
llvm::raw_string_ostream TOut(TemplateParams);
for (SpecsTy::reverse_iterator I = Specs.rbegin(), E = Specs.rend();
I != E; ++I) {
const TemplateParameterList *Params
= (*I)->getSpecializedTemplate()->getTemplateParameters();
const TemplateArgumentList &Args = (*I)->getTemplateArgs();
assert(Params->size() == Args.size());
for (unsigned i = 0, numParams = Params->size(); i != numParams; ++i) {
StringRef Param = Params->getParam(i)->getName();
if (Param.empty()) continue;
TOut << Param << " = ";
Args.get(i).print(Policy, TOut);
TOut << ", ";
}
}
FunctionTemplateSpecializationInfo *FSI
= FD->getTemplateSpecializationInfo();
if (FSI && !FSI->isExplicitSpecialization()) {
const TemplateParameterList* Params
= FSI->getTemplate()->getTemplateParameters();
const TemplateArgumentList* Args = FSI->TemplateArguments;
assert(Params->size() == Args->size());
for (unsigned i = 0, e = Params->size(); i != e; ++i) {
StringRef Param = Params->getParam(i)->getName();
if (Param.empty()) continue;
TOut << Param << " = ";
Args->get(i).print(Policy, TOut);
TOut << ", ";
}
}
TOut.flush();
if (!TemplateParams.empty()) {
// remove the trailing comma and space
TemplateParams.resize(TemplateParams.size() - 2);
POut << " [" << TemplateParams << "]";
}
POut.flush();
if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD))
AFT->getResultType().getAsStringInternal(Proto, Policy);
Out << Proto;
Out.flush();
return Name.str().str();
}
if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) {
SmallString<256> Name;
llvm::raw_svector_ostream Out(Name);
Out << (MD->isInstanceMethod() ? '-' : '+');
Out << '[';
// For incorrect code, there might not be an ObjCInterfaceDecl. Do
// a null check to avoid a crash.
if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
Out << *ID;
if (const ObjCCategoryImplDecl *CID =
dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext()))
Out << '(' << *CID << ')';
Out << ' ';
Out << MD->getSelector().getAsString();
Out << ']';
Out.flush();
return Name.str().str();
}
if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) {
// __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
return "top level";
}
return "";
}
void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) {
if (hasAllocation())
C.Deallocate(pVal);
BitWidth = Val.getBitWidth();
unsigned NumWords = Val.getNumWords();
const uint64_t* Words = Val.getRawData();
if (NumWords > 1) {
pVal = new (C) uint64_t[NumWords];
std::copy(Words, Words + NumWords, pVal);
} else if (NumWords == 1)
VAL = Words[0];
else
VAL = 0;
}
IntegerLiteral *
IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V,
QualType type, SourceLocation l) {
return new (C) IntegerLiteral(C, V, type, l);
}
IntegerLiteral *
IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) {
return new (C) IntegerLiteral(Empty);
}
FloatingLiteral *
FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V,
bool isexact, QualType Type, SourceLocation L) {
return new (C) FloatingLiteral(C, V, isexact, Type, L);
}
FloatingLiteral *
FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) {
return new (C) FloatingLiteral(C, Empty);
}
/// getValueAsApproximateDouble - This returns the value as an inaccurate
/// double. Note that this may cause loss of precision, but is useful for
/// debugging dumps, etc.
double FloatingLiteral::getValueAsApproximateDouble() const {
llvm::APFloat V = getValue();
bool ignored;
V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
&ignored);
return V.convertToDouble();
}
int StringLiteral::mapCharByteWidth(TargetInfo const &target,StringKind k) {
int CharByteWidth = 0;
switch(k) {
case Ascii:
case UTF8:
CharByteWidth = target.getCharWidth();
break;
case Wide:
CharByteWidth = target.getWCharWidth();
break;
case UTF16:
CharByteWidth = target.getChar16Width();
break;
case UTF32:
CharByteWidth = target.getChar32Width();
break;
}
assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple");
CharByteWidth /= 8;
assert((CharByteWidth==1 || CharByteWidth==2 || CharByteWidth==4)
&& "character byte widths supported are 1, 2, and 4 only");
return CharByteWidth;
}
StringLiteral *StringLiteral::Create(ASTContext &C, StringRef Str,
StringKind Kind, bool Pascal, QualType Ty,
const SourceLocation *Loc,
unsigned NumStrs) {
// Allocate enough space for the StringLiteral plus an array of locations for
// any concatenated string tokens.
void *Mem = C.Allocate(sizeof(StringLiteral)+
sizeof(SourceLocation)*(NumStrs-1),
llvm::alignOf<StringLiteral>());
StringLiteral *SL = new (Mem) StringLiteral(Ty);
// OPTIMIZE: could allocate this appended to the StringLiteral.
SL->setString(C,Str,Kind,Pascal);
SL->TokLocs[0] = Loc[0];
SL->NumConcatenated = NumStrs;
if (NumStrs != 1)
memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1));
return SL;
}
StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) {
void *Mem = C.Allocate(sizeof(StringLiteral)+
sizeof(SourceLocation)*(NumStrs-1),
llvm::alignOf<StringLiteral>());
StringLiteral *SL = new (Mem) StringLiteral(QualType());
SL->CharByteWidth = 0;
SL->Length = 0;
SL->NumConcatenated = NumStrs;
return SL;
}
void StringLiteral::setString(ASTContext &C, StringRef Str,
StringKind Kind, bool IsPascal) {
//FIXME: we assume that the string data comes from a target that uses the same
// code unit size and endianess for the type of string.
this->Kind = Kind;
this->IsPascal = IsPascal;
CharByteWidth = mapCharByteWidth(C.getTargetInfo(),Kind);
assert((Str.size()%CharByteWidth == 0)
&& "size of data must be multiple of CharByteWidth");
Length = Str.size()/CharByteWidth;
switch(CharByteWidth) {
case 1: {
char *AStrData = new (C) char[Length];
std::memcpy(AStrData,Str.data(),Str.size());
StrData.asChar = AStrData;
break;
}
case 2: {
uint16_t *AStrData = new (C) uint16_t[Length];
std::memcpy(AStrData,Str.data(),Str.size());
StrData.asUInt16 = AStrData;
break;
}
case 4: {
uint32_t *AStrData = new (C) uint32_t[Length];
std::memcpy(AStrData,Str.data(),Str.size());
StrData.asUInt32 = AStrData;
break;
}
default:
assert(false && "unsupported CharByteWidth");
}
}
/// getLocationOfByte - Return a source location that points to the specified
/// byte of this string literal.
///
/// Strings are amazingly complex. They can be formed from multiple tokens and
/// can have escape sequences in them in addition to the usual trigraph and
/// escaped newline business. This routine handles this complexity.
///
SourceLocation StringLiteral::
getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
const LangOptions &Features, const TargetInfo &Target) const {
assert(Kind == StringLiteral::Ascii && "This only works for ASCII strings");
// Loop over all of the tokens in this string until we find the one that
// contains the byte we're looking for.
unsigned TokNo = 0;
while (1) {
assert(TokNo < getNumConcatenated() && "Invalid byte number!");
SourceLocation StrTokLoc = getStrTokenLoc(TokNo);
// Get the spelling of the string so that we can get the data that makes up
// the string literal, not the identifier for the macro it is potentially
// expanded through.
SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc);
// Re-lex the token to get its length and original spelling.
std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc);
bool Invalid = false;
StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid);
if (Invalid)
return StrTokSpellingLoc;
const char *StrData = Buffer.data()+LocInfo.second;
// Create a langops struct and enable trigraphs. This is sufficient for
// relexing tokens.
LangOptions LangOpts;
LangOpts.Trigraphs = true;
// Create a lexer starting at the beginning of this token.
Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData,
Buffer.end());
Token TheTok;
TheLexer.LexFromRawLexer(TheTok);
// Use the StringLiteralParser to compute the length of the string in bytes.
StringLiteralParser SLP(&TheTok, 1, SM, Features, Target);
unsigned TokNumBytes = SLP.GetStringLength();
// If the byte is in this token, return the location of the byte.
if (ByteNo < TokNumBytes ||
(ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) {
unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo);
// Now that we know the offset of the token in the spelling, use the
// preprocessor to get the offset in the original source.
return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features);
}
// Move to the next string token.
++TokNo;
ByteNo -= TokNumBytes;
}
}
/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
/// corresponds to, e.g. "sizeof" or "[pre]++".
const char *UnaryOperator::getOpcodeStr(Opcode Op) {
switch (Op) {
case UO_PostInc: return "++";
case UO_PostDec: return "--";
case UO_PreInc: return "++";
case UO_PreDec: return "--";
case UO_AddrOf: return "&";
case UO_Deref: return "*";
case UO_Plus: return "+";
case UO_Minus: return "-";
case UO_Not: return "~";
case UO_LNot: return "!";
case UO_Real: return "__real";
case UO_Imag: return "__imag";
case UO_Extension: return "__extension__";
}
llvm_unreachable("Unknown unary operator");
}
UnaryOperatorKind
UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
switch (OO) {
default: llvm_unreachable("No unary operator for overloaded function");
case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc;
case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec;
case OO_Amp: return UO_AddrOf;
case OO_Star: return UO_Deref;
case OO_Plus: return UO_Plus;
case OO_Minus: return UO_Minus;
case OO_Tilde: return UO_Not;
case OO_Exclaim: return UO_LNot;
}
}
OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
switch (Opc) {
case UO_PostInc: case UO_PreInc: return OO_PlusPlus;
case UO_PostDec: case UO_PreDec: return OO_MinusMinus;
case UO_AddrOf: return OO_Amp;
case UO_Deref: return OO_Star;
case UO_Plus: return OO_Plus;
case UO_Minus: return OO_Minus;
case UO_Not: return OO_Tilde;
case UO_LNot: return OO_Exclaim;
default: return OO_None;
}
}
//===----------------------------------------------------------------------===//
// Postfix Operators.
//===----------------------------------------------------------------------===//
CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs,
Expr **args, unsigned numargs, QualType t, ExprValueKind VK,
SourceLocation rparenloc)
: Expr(SC, t, VK, OK_Ordinary,
fn->isTypeDependent(),
fn->isValueDependent(),
fn->isInstantiationDependent(),
fn->containsUnexpandedParameterPack()),
NumArgs(numargs) {
SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs];
SubExprs[FN] = fn;
for (unsigned i = 0; i != numargs; ++i) {
if (args[i]->isTypeDependent())
ExprBits.TypeDependent = true;
if (args[i]->isValueDependent())
ExprBits.ValueDependent = true;
if (args[i]->isInstantiationDependent())
ExprBits.InstantiationDependent = true;
if (args[i]->containsUnexpandedParameterPack())
ExprBits.ContainsUnexpandedParameterPack = true;
SubExprs[i+PREARGS_START+NumPreArgs] = args[i];
}
CallExprBits.NumPreArgs = NumPreArgs;
RParenLoc = rparenloc;
}
CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs,
QualType t, ExprValueKind VK, SourceLocation rparenloc)
: Expr(CallExprClass, t, VK, OK_Ordinary,
fn->isTypeDependent(),
fn->isValueDependent(),
fn->isInstantiationDependent(),
fn->containsUnexpandedParameterPack()),
NumArgs(numargs) {
SubExprs = new (C) Stmt*[numargs+PREARGS_START];
SubExprs[FN] = fn;
for (unsigned i = 0; i != numargs; ++i) {
if (args[i]->isTypeDependent())
ExprBits.TypeDependent = true;
if (args[i]->isValueDependent())
ExprBits.ValueDependent = true;
if (args[i]->isInstantiationDependent())
ExprBits.InstantiationDependent = true;
if (args[i]->containsUnexpandedParameterPack())
ExprBits.ContainsUnexpandedParameterPack = true;
SubExprs[i+PREARGS_START] = args[i];
}
CallExprBits.NumPreArgs = 0;
RParenLoc = rparenloc;
}
CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty)
: Expr(SC, Empty), SubExprs(0), NumArgs(0) {
// FIXME: Why do we allocate this?
SubExprs = new (C) Stmt*[PREARGS_START];
CallExprBits.NumPreArgs = 0;
}
CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs,
EmptyShell Empty)
: Expr(SC, Empty), SubExprs(0), NumArgs(0) {
// FIXME: Why do we allocate this?
SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs];
CallExprBits.NumPreArgs = NumPreArgs;
}
Decl *CallExpr::getCalleeDecl() {
Expr *CEE = getCallee()->IgnoreParenImpCasts();
while (SubstNonTypeTemplateParmExpr *NTTP
= dyn_cast<SubstNonTypeTemplateParmExpr>(CEE)) {
CEE = NTTP->getReplacement()->IgnoreParenCasts();
}
// If we're calling a dereference, look at the pointer instead.
if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) {
if (BO->isPtrMemOp())
CEE = BO->getRHS()->IgnoreParenCasts();
} else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) {
if (UO->getOpcode() == UO_Deref)
CEE = UO->getSubExpr()->IgnoreParenCasts();
}
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE))
return DRE->getDecl();
if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE))
return ME->getMemberDecl();
return 0;
}
FunctionDecl *CallExpr::getDirectCallee() {
return dyn_cast_or_null<FunctionDecl>(getCalleeDecl());
}
/// setNumArgs - This changes the number of arguments present in this call.
/// Any orphaned expressions are deleted by this, and any new operands are set
/// to null.
void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) {
// No change, just return.
if (NumArgs == getNumArgs()) return;
// If shrinking # arguments, just delete the extras and forgot them.
if (NumArgs < getNumArgs()) {
this->NumArgs = NumArgs;
return;
}
// Otherwise, we are growing the # arguments. New an bigger argument array.
unsigned NumPreArgs = getNumPreArgs();
Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs];
// Copy over args.
for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i)
NewSubExprs[i] = SubExprs[i];
// Null out new args.
for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs;
i != NumArgs+PREARGS_START+NumPreArgs; ++i)
NewSubExprs[i] = 0;
if (SubExprs) C.Deallocate(SubExprs);
SubExprs = NewSubExprs;
this->NumArgs = NumArgs;
}
/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If
/// not, return 0.
unsigned CallExpr::isBuiltinCall() const {
// All simple function calls (e.g. func()) are implicitly cast to pointer to
// function. As a result, we try and obtain the DeclRefExpr from the
// ImplicitCastExpr.
const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee());
if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()).
return 0;
const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr());
if (!DRE)
return 0;
const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl());
if (!FDecl)
return 0;
if (!FDecl->getIdentifier())
return 0;
return FDecl->getBuiltinID();
}
QualType CallExpr::getCallReturnType() const {
QualType CalleeType = getCallee()->getType();
if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>())
CalleeType = FnTypePtr->getPointeeType();
else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>())
CalleeType = BPT->getPointeeType();
else if (CalleeType->isSpecificPlaceholderType(BuiltinType::BoundMember))
// This should never be overloaded and so should never return null.
CalleeType = Expr::findBoundMemberType(getCallee());
const FunctionType *FnType = CalleeType->castAs<FunctionType>();
return FnType->getResultType();
}
SourceRange CallExpr::getSourceRange() const {
if (isa<CXXOperatorCallExpr>(this))
return cast<CXXOperatorCallExpr>(this)->getSourceRange();
SourceLocation begin = getCallee()->getLocStart();
if (begin.isInvalid() && getNumArgs() > 0)
begin = getArg(0)->getLocStart();
SourceLocation end = getRParenLoc();
if (end.isInvalid() && getNumArgs() > 0)
end = getArg(getNumArgs() - 1)->getLocEnd();
return SourceRange(begin, end);
}
SourceLocation CallExpr::getLocStart() const {
if (isa<CXXOperatorCallExpr>(this))
return cast<CXXOperatorCallExpr>(this)->getSourceRange().getBegin();
SourceLocation begin = getCallee()->getLocStart();
if (begin.isInvalid() && getNumArgs() > 0)
begin = getArg(0)->getLocStart();
return begin;
}
SourceLocation CallExpr::getLocEnd() const {
if (isa<CXXOperatorCallExpr>(this))
return cast<CXXOperatorCallExpr>(this)->getSourceRange().getEnd();
SourceLocation end = getRParenLoc();
if (end.isInvalid() && getNumArgs() > 0)
end = getArg(getNumArgs() - 1)->getLocEnd();
return end;
}
OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type,
SourceLocation OperatorLoc,
TypeSourceInfo *tsi,
OffsetOfNode* compsPtr, unsigned numComps,
Expr** exprsPtr, unsigned numExprs,
SourceLocation RParenLoc) {
void *Mem = C.Allocate(sizeof(OffsetOfExpr) +
sizeof(OffsetOfNode) * numComps +
sizeof(Expr*) * numExprs);
return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps,
exprsPtr, numExprs, RParenLoc);
}
OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C,
unsigned numComps, unsigned numExprs) {
void *Mem = C.Allocate(sizeof(OffsetOfExpr) +
sizeof(OffsetOfNode) * numComps +
sizeof(Expr*) * numExprs);
return new (Mem) OffsetOfExpr(numComps, numExprs);
}
OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type,
SourceLocation OperatorLoc, TypeSourceInfo *tsi,
OffsetOfNode* compsPtr, unsigned numComps,
Expr** exprsPtr, unsigned numExprs,
SourceLocation RParenLoc)
: Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary,
/*TypeDependent=*/false,
/*ValueDependent=*/tsi->getType()->isDependentType(),
tsi->getType()->isInstantiationDependentType(),
tsi->getType()->containsUnexpandedParameterPack()),
OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi),
NumComps(numComps), NumExprs(numExprs)
{
for(unsigned i = 0; i < numComps; ++i) {
setComponent(i, compsPtr[i]);
}
for(unsigned i = 0; i < numExprs; ++i) {
if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent())
ExprBits.ValueDependent = true;
if (exprsPtr[i]->containsUnexpandedParameterPack())
ExprBits.ContainsUnexpandedParameterPack = true;
setIndexExpr(i, exprsPtr[i]);
}
}
IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const {
assert(getKind() == Field || getKind() == Identifier);
if (getKind() == Field)
return getField()->getIdentifier();
return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask);
}
MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow,
NestedNameSpecifierLoc QualifierLoc,
SourceLocation TemplateKWLoc,
ValueDecl *memberdecl,
DeclAccessPair founddecl,
DeclarationNameInfo nameinfo,
const TemplateArgumentListInfo *targs,
QualType ty,
ExprValueKind vk,
ExprObjectKind ok) {
std::size_t Size = sizeof(MemberExpr);
bool hasQualOrFound = (QualifierLoc ||
founddecl.getDecl() != memberdecl ||
founddecl.getAccess() != memberdecl->getAccess());
if (hasQualOrFound)
Size += sizeof(MemberNameQualifier);
if (targs)
Size += ASTTemplateKWAndArgsInfo::sizeFor(targs->size());
else if (TemplateKWLoc.isValid())
Size += ASTTemplateKWAndArgsInfo::sizeFor(0);
void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>());
MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo,
ty, vk, ok);
if (hasQualOrFound) {
// FIXME: Wrong. We should be looking at the member declaration we found.
if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent()) {
E->setValueDependent(true);
E->setTypeDependent(true);
E->setInstantiationDependent(true);
}
else if (QualifierLoc &&
QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent())
E->setInstantiationDependent(true);
E->HasQualifierOrFoundDecl = true;
MemberNameQualifier *NQ = E->getMemberQualifier();
NQ->QualifierLoc = QualifierLoc;
NQ->FoundDecl = founddecl;
}
E->HasTemplateKWAndArgsInfo = (targs || TemplateKWLoc.isValid());
if (targs) {
bool Dependent = false;
bool InstantiationDependent = false;
bool ContainsUnexpandedParameterPack = false;
E->getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc, *targs,
Dependent,
InstantiationDependent,
ContainsUnexpandedParameterPack);
if (InstantiationDependent)
E->setInstantiationDependent(true);
} else if (TemplateKWLoc.isValid()) {
E->getTemplateKWAndArgsInfo()->initializeFrom(TemplateKWLoc);
}
return E;
}
SourceRange MemberExpr::getSourceRange() const {
return SourceRange(getLocStart(), getLocEnd());
}
SourceLocation MemberExpr::getLocStart() const {
if (isImplicitAccess()) {
if (hasQualifier())
return getQualifierLoc().getBeginLoc();
return MemberLoc;
}
// FIXME: We don't want this to happen. Rather, we should be able to
// detect all kinds of implicit accesses more cleanly.
SourceLocation BaseStartLoc = getBase()->getLocStart();
if (BaseStartLoc.isValid())
return BaseStartLoc;
return MemberLoc;
}
SourceLocation MemberExpr::getLocEnd() const {
if (hasExplicitTemplateArgs())
return getRAngleLoc();
return getMemberNameInfo().getEndLoc();
}
void CastExpr::CheckCastConsistency() const {
switch (getCastKind()) {
case CK_DerivedToBase:
case CK_UncheckedDerivedToBase:
case CK_DerivedToBaseMemberPointer:
case CK_BaseToDerived:
case CK_BaseToDerivedMemberPointer:
assert(!path_empty() && "Cast kind should have a base path!");
break;
case CK_CPointerToObjCPointerCast:
assert(getType()->isObjCObjectPointerType());
assert(getSubExpr()->getType()->isPointerType());
goto CheckNoBasePath;
case CK_BlockPointerToObjCPointerCast:
assert(getType()->isObjCObjectPointerType());
assert(getSubExpr()->getType()->isBlockPointerType());
goto CheckNoBasePath;
case CK_ReinterpretMemberPointer:
assert(getType()->isMemberPointerType());
assert(getSubExpr()->getType()->isMemberPointerType());
goto CheckNoBasePath;
case CK_BitCast:
// Arbitrary casts to C pointer types count as bitcasts.
// Otherwise, we should only have block and ObjC pointer casts
// here if they stay within the type kind.
if (!getType()->isPointerType()) {
assert(getType()->isObjCObjectPointerType() ==
getSubExpr()->getType()->isObjCObjectPointerType());
assert(getType()->isBlockPointerType() ==
getSubExpr()->getType()->isBlockPointerType());
}
goto CheckNoBasePath;
case CK_AnyPointerToBlockPointerCast:
assert(getType()->isBlockPointerType());
assert(getSubExpr()->getType()->isAnyPointerType() &&
!getSubExpr()->getType()->isBlockPointerType());
goto CheckNoBasePath;
case CK_CopyAndAutoreleaseBlockObject:
assert(getType()->isBlockPointerType());
assert(getSubExpr()->getType()->isBlockPointerType());
goto CheckNoBasePath;
// These should not have an inheritance path.
case CK_Dynamic:
case CK_ToUnion:
case CK_ArrayToPointerDecay:
case CK_FunctionToPointerDecay:
case CK_NullToMemberPointer:
case CK_NullToPointer:
case CK_ConstructorConversion:
case CK_IntegralToPointer:
case CK_PointerToIntegral:
case CK_ToVoid:
case CK_VectorSplat:
case CK_IntegralCast:
case CK_IntegralToFloating:
case CK_FloatingToIntegral:
case CK_FloatingCast:
case CK_ObjCObjectLValueCast:
case CK_FloatingRealToComplex:
case CK_FloatingComplexToReal:
case CK_FloatingComplexCast:
case CK_FloatingComplexToIntegralComplex:
case CK_IntegralRealToComplex:
case CK_IntegralComplexToReal:
case CK_IntegralComplexCast:
case CK_IntegralComplexToFloatingComplex:
case CK_ARCProduceObject:
case CK_ARCConsumeObject:
case CK_ARCReclaimReturnedObject:
case CK_ARCExtendBlockObject:
assert(!getType()->isBooleanType() && "unheralded conversion to bool");
goto CheckNoBasePath;
case CK_Dependent:
case CK_LValueToRValue:
case CK_NoOp:
case CK_AtomicToNonAtomic:
case CK_NonAtomicToAtomic:
case CK_PointerToBoolean:
case CK_IntegralToBoolean:
case CK_FloatingToBoolean:
case CK_MemberPointerToBoolean:
case CK_FloatingComplexToBoolean:
case CK_IntegralComplexToBoolean:
case CK_LValueBitCast: // -> bool&
case CK_UserDefinedConversion: // operator bool()
CheckNoBasePath:
assert(path_empty() && "Cast kind should not have a base path!");
break;
}
}
const char *CastExpr::getCastKindName() const {
switch (getCastKind()) {
case CK_Dependent:
return "Dependent";
case CK_BitCast:
return "BitCast";
case CK_LValueBitCast:
return "LValueBitCast";
case CK_LValueToRValue:
return "LValueToRValue";
case CK_NoOp:
return "NoOp";
case CK_BaseToDerived:
return "BaseToDerived";
case CK_DerivedToBase:
return "DerivedToBase";
case CK_UncheckedDerivedToBase:
return "UncheckedDerivedToBase";
case CK_Dynamic:
return "Dynamic";
case CK_ToUnion:
return "ToUnion";
case CK_ArrayToPointerDecay:
return "ArrayToPointerDecay";
case CK_FunctionToPointerDecay:
return "FunctionToPointerDecay";
case CK_NullToMemberPointer:
return "NullToMemberPointer";
case CK_NullToPointer:
return "NullToPointer";
case CK_BaseToDerivedMemberPointer:
return "BaseToDerivedMemberPointer";
case CK_DerivedToBaseMemberPointer:
return "DerivedToBaseMemberPointer";
case CK_ReinterpretMemberPointer:
return "ReinterpretMemberPointer";
case CK_UserDefinedConversion:
return "UserDefinedConversion";
case CK_ConstructorConversion:
return "ConstructorConversion";
case CK_IntegralToPointer:
return "IntegralToPointer";
case CK_PointerToIntegral:
return "PointerToIntegral";
case CK_PointerToBoolean:
return "PointerToBoolean";
case CK_ToVoid:
return "ToVoid";
case CK_VectorSplat:
return "VectorSplat";
case CK_IntegralCast:
return "IntegralCast";
case CK_IntegralToBoolean:
return "IntegralToBoolean";
case CK_IntegralToFloating:
return "IntegralToFloating";
case CK_FloatingToIntegral:
return "FloatingToIntegral";
case CK_FloatingCast:
return "FloatingCast";
case CK_FloatingToBoolean:
return "FloatingToBoolean";
case CK_MemberPointerToBoolean:
return "MemberPointerToBoolean";
case CK_CPointerToObjCPointerCast:
return "CPointerToObjCPointerCast";
case CK_BlockPointerToObjCPointerCast:
return "BlockPointerToObjCPointerCast";
case CK_AnyPointerToBlockPointerCast:
return "AnyPointerToBlockPointerCast";
case CK_ObjCObjectLValueCast:
return "ObjCObjectLValueCast";
case CK_FloatingRealToComplex:
return "FloatingRealToComplex";
case CK_FloatingComplexToReal:
return "FloatingComplexToReal";
case CK_FloatingComplexToBoolean:
return "FloatingComplexToBoolean";
case CK_FloatingComplexCast:
return "FloatingComplexCast";
case CK_FloatingComplexToIntegralComplex:
return "FloatingComplexToIntegralComplex";
case CK_IntegralRealToComplex:
return "IntegralRealToComplex";
case CK_IntegralComplexToReal:
return "IntegralComplexToReal";
case CK_IntegralComplexToBoolean:
return "IntegralComplexToBoolean";
case CK_IntegralComplexCast:
return "IntegralComplexCast";
case CK_IntegralComplexToFloatingComplex:
return "IntegralComplexToFloatingComplex";
case CK_ARCConsumeObject:
return "ARCConsumeObject";
case CK_ARCProduceObject:
return "ARCProduceObject";
case CK_ARCReclaimReturnedObject:
return "ARCReclaimReturnedObject";
case CK_ARCExtendBlockObject:
return "ARCCExtendBlockObject";
case CK_AtomicToNonAtomic:
return "AtomicToNonAtomic";
case CK_NonAtomicToAtomic:
return "NonAtomicToAtomic";
case CK_CopyAndAutoreleaseBlockObject:
return "CopyAndAutoreleaseBlockObject";
}
llvm_unreachable("Unhandled cast kind!");
}
Expr *CastExpr::getSubExprAsWritten() {
Expr *SubExpr = 0;
CastExpr *E = this;
do {
SubExpr = E->getSubExpr();
// Skip through reference binding to temporary.
if (MaterializeTemporaryExpr *Materialize
= dyn_cast<MaterializeTemporaryExpr>(SubExpr))
SubExpr = Materialize->GetTemporaryExpr();
// Skip any temporary bindings; they're implicit.
if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
SubExpr = Binder->getSubExpr();
// Conversions by constructor and conversion functions have a
// subexpression describing the call; strip it off.
if (E->getCastKind() == CK_ConstructorConversion)
SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0);
else if (E->getCastKind() == CK_UserDefinedConversion)
SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument();
// If the subexpression we're left with is an implicit cast, look
// through that, too.
} while ((E = dyn_cast<ImplicitCastExpr>(SubExpr)));
return SubExpr;
}
CXXBaseSpecifier **CastExpr::path_buffer() {
switch (getStmtClass()) {
#define ABSTRACT_STMT(x)
#define CASTEXPR(Type, Base) \
case Stmt::Type##Class: \
return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1);
#define STMT(Type, Base)
#include "clang/AST/StmtNodes.inc"
default:
llvm_unreachable("non-cast expressions not possible here");
}
}
void CastExpr::setCastPath(const CXXCastPath &Path) {
assert(Path.size() == path_size());
memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*));
}
ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T,
CastKind Kind, Expr *Operand,
const CXXCastPath *BasePath,
ExprValueKind VK) {
unsigned PathSize = (BasePath ? BasePath->size() : 0);
void *Buffer =
C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
ImplicitCastExpr *E =
new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK);
if (PathSize) E->setCastPath(*BasePath);
return E;
}
ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C,
unsigned PathSize) {
void *Buffer =
C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize);
}
CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T,
ExprValueKind VK, CastKind K, Expr *Op,
const CXXCastPath *BasePath,
TypeSourceInfo *WrittenTy,
SourceLocation L, SourceLocation R) {
unsigned PathSize = (BasePath ? BasePath->size() : 0);
void *Buffer =
C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
CStyleCastExpr *E =
new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R);
if (PathSize) E->setCastPath(*BasePath);
return E;
}
CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) {
void *Buffer =
C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize);
}
/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
/// corresponds to, e.g. "<<=".
const char *BinaryOperator::getOpcodeStr(Opcode Op) {
switch (Op) {
case BO_PtrMemD: return ".*";
case BO_PtrMemI: return "->*";
case BO_Mul: return "*";
case BO_Div: return "/";
case BO_Rem: return "%";
case BO_Add: return "+";
case BO_Sub: return "-";
case BO_Shl: return "<<";
case BO_Shr: return ">>";
case BO_LT: return "<";
case BO_GT: return ">";
case BO_LE: return "<=";
case BO_GE: return ">=";
case BO_EQ: return "==";
case BO_NE: return "!=";
case BO_And: return "&";
case BO_Xor: return "^";
case BO_Or: return "|";
case BO_LAnd: return "&&";
case BO_LOr: return "||";
case BO_Assign: return "=";
case BO_MulAssign: return "*=";
case BO_DivAssign: return "/=";
case BO_RemAssign: return "%=";
case BO_AddAssign: return "+=";
case BO_SubAssign: return "-=";
case BO_ShlAssign: return "<<=";
case BO_ShrAssign: return ">>=";
case BO_AndAssign: return "&=";
case BO_XorAssign: return "^=";
case BO_OrAssign: return "|=";
case BO_Comma: return ",";
}
llvm_unreachable("Invalid OpCode!");
}
BinaryOperatorKind
BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
switch (OO) {
default: llvm_unreachable("Not an overloadable binary operator");
case OO_Plus: return BO_Add;
case OO_Minus: return BO_Sub;
case OO_Star: return BO_Mul;
case OO_Slash: return BO_Div;
case OO_Percent: return BO_Rem;
case OO_Caret: return BO_Xor;
case OO_Amp: return BO_And;
case OO_Pipe: return BO_Or;
case OO_Equal: return BO_Assign;
case OO_Less: return BO_LT;
case OO_Greater: return BO_GT;
case OO_PlusEqual: return BO_AddAssign;
case OO_MinusEqual: return BO_SubAssign;
case OO_StarEqual: return BO_MulAssign;
case OO_SlashEqual: return BO_DivAssign;
case OO_PercentEqual: return BO_RemAssign;
case OO_CaretEqual: return BO_XorAssign;
case OO_AmpEqual: return BO_AndAssign;
case OO_PipeEqual: return BO_OrAssign;
case OO_LessLess: return BO_Shl;
case OO_GreaterGreater: return BO_Shr;
case OO_LessLessEqual: return BO_ShlAssign;
case OO_GreaterGreaterEqual: return BO_ShrAssign;
case OO_EqualEqual: return BO_EQ;
case OO_ExclaimEqual: return BO_NE;
case OO_LessEqual: return BO_LE;
case OO_GreaterEqual: return BO_GE;
case OO_AmpAmp: return BO_LAnd;
case OO_PipePipe: return BO_LOr;
case OO_Comma: return BO_Comma;
case OO_ArrowStar: return BO_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(ASTContext &C, SourceLocation lbraceloc,
Expr **initExprs, unsigned numInits,
SourceLocation rbraceloc)
: Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false,
false, false),
InitExprs(C, numInits),
LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0)
{
sawArrayRangeDesignator(false);
setInitializesStdInitializerList(false);
for (unsigned I = 0; I != numInits; ++I) {
if (initExprs[I]->isTypeDependent())
ExprBits.TypeDependent = true;
if (initExprs[I]->isValueDependent())
ExprBits.ValueDependent = true;
if (initExprs[I]->isInstantiationDependent())
ExprBits.InstantiationDependent = true;
if (initExprs[I]->containsUnexpandedParameterPack())
ExprBits.ContainsUnexpandedParameterPack = true;
}
InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits);
}
void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) {
if (NumInits > InitExprs.size())
InitExprs.reserve(C, NumInits);
}
void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) {
InitExprs.resize(C, NumInits, 0);
}
Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) {
if (Init >= InitExprs.size()) {
InitExprs.insert(C, 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;
}
void InitListExpr::setArrayFiller(Expr *filler) {
assert(!hasArrayFiller() && "Filler already set!");
ArrayFillerOrUnionFieldInit = filler;
// Fill out any "holes" in the array due to designated initializers.
Expr **inits = getInits();
for (unsigned i = 0, e = getNumInits(); i != e; ++i)
if (inits[i] == 0)
inits[i] = filler;
}
SourceRange InitListExpr::getSourceRange() const {
if (SyntacticForm)
return SyntacticForm->getSourceRange();
SourceLocation Beg = LBraceLoc, End = RBraceLoc;
if (Beg.isInvalid()) {
// Find the first non-null initializer.
for (InitExprsTy::const_iterator I = InitExprs.begin(),
E = InitExprs.end();
I != E; ++I) {
if (Stmt *S = *I) {
Beg = S->getLocStart();
break;
}
}
}
if (End.isInvalid()) {
// Find the first non-null initializer from the end.
for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(),
E = InitExprs.rend();
I != E; ++I) {
if (Stmt *S = *I) {
End = S->getSourceRange().getEnd();
break;
}
}
}
return SourceRange(Beg, End);
}
/// getFunctionType - Return the underlying function type for this block.
///
const FunctionProtoType *BlockExpr::getFunctionType() const {
// The block pointer is never sugared, but the function type might be.
return cast<BlockPointerType>(getType())
->getPointeeType()->castAs<FunctionProtoType>();
}
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, ASTContext &Ctx) 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:
if (getType()->isVoidType())
return false;
Loc = getExprLoc();
R1 = getSourceRange();
return true;
case ParenExprClass:
return cast<ParenExpr>(this)->getSubExpr()->
isUnusedResultAWarning(Loc, R1, R2, Ctx);
case GenericSelectionExprClass:
return cast<GenericSelectionExpr>(this)->getResultExpr()->
isUnusedResultAWarning(Loc, R1, R2, Ctx);
case UnaryOperatorClass: {
const UnaryOperator *UO = cast<UnaryOperator>(this);
switch (UO->getOpcode()) {
default: break;
case UO_PostInc:
case UO_PostDec:
case UO_PreInc:
case UO_PreDec: // ++/--
return false; // Not a warning.
case UO_Deref:
// Dereferencing a volatile pointer is a side-effect.
if (Ctx.getCanonicalType(getType()).isVolatileQualified())
return false;
break;
case UO_Real:
case UO_Imag:
// accessing a piece of a volatile complex is a side-effect.
if (Ctx.getCanonicalType(UO->getSubExpr()->getType())
.isVolatileQualified())
return false;
break;
case UO_Extension:
return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
}
Loc = UO->getOperatorLoc();
R1 = UO->getSubExpr()->getSourceRange();
return true;
}
case BinaryOperatorClass: {
const BinaryOperator *BO = cast<BinaryOperator>(this);
switch (BO->getOpcode()) {
default:
break;
// Consider the RHS of comma for side effects. LHS was checked by
// Sema::CheckCommaOperands.
case BO_Comma:
// ((foo = <blah>), 0) is an idiom for hiding the result (and
// lvalue-ness) of an assignment written in a macro.
if (IntegerLiteral *IE =
dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens()))
if (IE->getValue() == 0)
return false;
return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
// Consider '||', '&&' to have side effects if the LHS or RHS does.
case BO_LAnd:
case BO_LOr:
if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) ||
!BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx))
return false;
break;
}
if (BO->isAssignmentOp())
return false;
Loc = BO->getOperatorLoc();
R1 = BO->getLHS()->getSourceRange();
R2 = BO->getRHS()->getSourceRange();
return true;
}
case CompoundAssignOperatorClass:
case VAArgExprClass:
case AtomicExprClass:
return false;
case ConditionalOperatorClass: {
// If only one of the LHS or RHS is a warning, the operator might
// be being used for control flow. Only warn if both the LHS and
// RHS are warnings.
const ConditionalOperator *Exp = cast<ConditionalOperator>(this);
if (!Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx))
return false;
if (!Exp->getLHS())
return true;
return Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
}
case MemberExprClass:
// If the base pointer or element is to a volatile pointer/field, accessing
// it is a side effect.
if (Ctx.getCanonicalType(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 (Ctx.getCanonicalType(getType()).isVolatileQualified())
return false;
Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc();
R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange();
R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange();
return true;
case CXXOperatorCallExprClass: {
// We warn about operator== and operator!= even when user-defined operator
// overloads as there is no reasonable way to define these such that they
// have non-trivial, desirable side-effects. See the -Wunused-comparison
// warning: these operators are commonly typo'ed, and so warning on them
// provides additional value as well. If this list is updated,
// DiagnoseUnusedComparison should be as well.
const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(this);
if (Op->getOperator() == OO_EqualEqual ||
Op->getOperator() == OO_ExclaimEqual) {
Loc = Op->getOperatorLoc();
R1 = Op->getSourceRange();
return true;
}
// Fallthrough for generic call handling.
}
case CallExprClass:
case CXXMemberCallExprClass:
case UserDefinedLiteralClass: {
// If this is a direct call, get the callee.
const CallExpr *CE = cast<CallExpr>(this);
if (const Decl *FD = CE->getCalleeDecl()) {
// If the callee has attribute pure, const, or warn_unused_result, warn
// about it. void foo() { strlen("bar"); } should warn.
//
// Note: If new cases are added here, DiagnoseUnusedExprResult should be
// updated to match for QoI.
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 CXXTemporaryObjectExprClass:
case CXXConstructExprClass:
return false;
case ObjCMessageExprClass: {
const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this);
if (Ctx.getLangOpts().ObjCAutoRefCount &&
ME->isInstanceMessage() &&
!ME->getType()->isVoidType() &&
ME->getSelector().getIdentifierInfoForSlot(0) &&
ME->getSelector().getIdentifierInfoForSlot(0)
->getName().startswith("init")) {
Loc = getExprLoc();
R1 = ME->getSourceRange();
return true;
}
const ObjCMethodDecl *MD = ME->getMethodDecl();
if (MD && MD->getAttr<WarnUnusedResultAttr>()) {
Loc = getExprLoc();
return true;
}
return false;
}
case ObjCPropertyRefExprClass:
Loc = getExprLoc();
R1 = getSourceRange();
return true;
case PseudoObjectExprClass: {
const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this);
// Only complain about things that have the form of a getter.
if (isa<UnaryOperator>(PO->getSyntacticForm()) ||
isa<BinaryOperator>(PO->getSyntacticForm()))
return false;
Loc = getExprLoc();
R1 = getSourceRange();
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, Ctx);
if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back()))
if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt()))
return E->isUnusedResultAWarning(Loc, R1, R2, Ctx);
}
if (getType()->isVoidType())
return false;
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 (getType()->isVoidType())
return false;
const CastExpr *CE = cast<CastExpr>(this);
// If this is a cast to void or a constructor conversion, check the operand.
// Otherwise, the result of the cast is unused.
if (CE->getCastKind() == CK_ToVoid ||
CE->getCastKind() == CK_ConstructorConversion)
return (cast<CastExpr>(this)->getSubExpr()
->isUnusedResultAWarning(Loc, R1, R2, Ctx));
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, Ctx));
case CXXDefaultArgExprClass:
return (cast<CXXDefaultArgExpr>(this)
->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
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, Ctx));
case ExprWithCleanupsClass:
return (cast<ExprWithCleanups>(this)
->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
}
}
/// isOBJCGCCandidate - Check if an expression is objc gc'able.
/// returns true, if it is; false otherwise.
bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
const Expr *E = IgnoreParens();
switch (E->getStmtClass()) {
default:
return false;
case ObjCIvarRefExprClass:
return true;
case Expr::UnaryOperatorClass:
return cast<UnaryOperator>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
case ImplicitCastExprClass:
return cast<ImplicitCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
case MaterializeTemporaryExprClass:
return cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr()
->isOBJCGCCandidate(Ctx);
case CStyleCastExprClass:
return cast<CStyleCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
case DeclRefExprClass: {
const Decl *D = cast<DeclRefExpr>(E)->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>(E);
return M->getBase()->isOBJCGCCandidate(Ctx);
}
case ArraySubscriptExprClass:
return cast<ArraySubscriptExpr>(E)->getBase()->isOBJCGCCandidate(Ctx);
}
}
bool Expr::isBoundMemberFunction(ASTContext &Ctx) const {
if (isTypeDependent())
return false;
return ClassifyLValue(Ctx) == Expr::LV_MemberFunction;
}
QualType Expr::findBoundMemberType(const Expr *expr) {
assert(expr->hasPlaceholderType(BuiltinType::BoundMember));
// Bound member expressions are always one of these possibilities:
// x->m x.m x->*y x.*y
// (possibly parenthesized)
expr = expr->IgnoreParens();
if (const MemberExpr *mem = dyn_cast<MemberExpr>(expr)) {
assert(isa<CXXMethodDecl>(mem->getMemberDecl()));
return mem->getMemberDecl()->getType();
}
if (const BinaryOperator *op = dyn_cast<BinaryOperator>(expr)) {
QualType type = op->getRHS()->getType()->castAs<MemberPointerType>()
->getPointeeType();
assert(type->isFunctionType());
return type;
}
assert(isa<UnresolvedMemberExpr>(expr));
return QualType();
}
static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1,
Expr::CanThrowResult CT2) {
// CanThrowResult constants are ordered so that the maximum is the correct
// merge result.
return CT1 > CT2 ? CT1 : CT2;
}
static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) {
Expr *E = const_cast<Expr*>(CE);
Expr::CanThrowResult R = Expr::CT_Cannot;
for (Expr::child_range I = E->children(); I && R != Expr::CT_Can; ++I) {
R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C));
}
return R;
}
static Expr::CanThrowResult CanCalleeThrow(ASTContext &Ctx, const Expr *E,
const Decl *D,
bool NullThrows = true) {
if (!D)
return NullThrows ? Expr::CT_Can : Expr::CT_Cannot;
// See if we can get a function type from the decl somehow.
const ValueDecl *VD = dyn_cast<ValueDecl>(D);
if (!VD) // If we have no clue what we're calling, assume the worst.
return Expr::CT_Can;
// As an extension, we assume that __attribute__((nothrow)) functions don't
// throw.
if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>())
return Expr::CT_Cannot;
QualType T = VD->getType();
const FunctionProtoType *FT;
if ((FT = T->getAs<FunctionProtoType>())) {
} else if (const PointerType *PT = T->getAs<PointerType>())
FT = PT->getPointeeType()->getAs<FunctionProtoType>();
else if (const ReferenceType *RT = T->getAs<ReferenceType>())
FT = RT->getPointeeType()->getAs<FunctionProtoType>();
else if (const MemberPointerType *MT = T->getAs<MemberPointerType>())
FT = MT->getPointeeType()->getAs<FunctionProtoType>();
else if (const BlockPointerType *BT = T->getAs<BlockPointerType>())
FT = BT->getPointeeType()->getAs<FunctionProtoType>();
if (!FT)
return Expr::CT_Can;
if (FT->getExceptionSpecType() == EST_Delayed) {
assert(isa<CXXConstructorDecl>(D) &&
"only constructor exception specs can be unknown");
Ctx.getDiagnostics().Report(E->getLocStart(),
diag::err_exception_spec_unknown)
<< E->getSourceRange();
return Expr::CT_Can;
}
return FT->isNothrow(Ctx) ? Expr::CT_Cannot : Expr::CT_Can;
}
static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) {
if (DC->isTypeDependent())
return Expr::CT_Dependent;
if (!DC->getTypeAsWritten()->isReferenceType())
return Expr::CT_Cannot;
if (DC->getSubExpr()->isTypeDependent())
return Expr::CT_Dependent;
return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot;
}
static Expr::CanThrowResult CanTypeidThrow(ASTContext &C,
const CXXTypeidExpr *DC) {
if (DC->isTypeOperand())
return Expr::CT_Cannot;
Expr *Op = DC->getExprOperand();
if (Op->isTypeDependent())
return Expr::CT_Dependent;
const RecordType *RT = Op->getType()->getAs<RecordType>();
if (!RT)
return Expr::CT_Cannot;
if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic())
return Expr::CT_Cannot;
if (Op->Classify(C).isPRValue())
return Expr::CT_Cannot;
return Expr::CT_Can;
}
Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const {
// C++ [expr.unary.noexcept]p3:
// [Can throw] if in a potentially-evaluated context the expression would
// contain:
switch (getStmtClass()) {
case CXXThrowExprClass:
// - a potentially evaluated throw-expression
return CT_Can;
case CXXDynamicCastExprClass: {
// - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v),
// where T is a reference type, that requires a run-time check
CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this));
if (CT == CT_Can)
return CT;
return MergeCanThrow(CT, CanSubExprsThrow(C, this));
}
case CXXTypeidExprClass:
// - a potentially evaluated typeid expression applied to a glvalue
// expression whose type is a polymorphic class type
return CanTypeidThrow(C, cast<CXXTypeidExpr>(this));
// - a potentially evaluated call to a function, member function, function
// pointer, or member function pointer that does not have a non-throwing
// exception-specification
case CallExprClass:
case CXXMemberCallExprClass:
case CXXOperatorCallExprClass:
case UserDefinedLiteralClass: {
const CallExpr *CE = cast<CallExpr>(this);
CanThrowResult CT;
if (isTypeDependent())
CT = CT_Dependent;
else if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens()))
CT = CT_Cannot;
else
CT = CanCalleeThrow(C, this, CE->getCalleeDecl());
if (CT == CT_Can)
return CT;
return MergeCanThrow(CT, CanSubExprsThrow(C, this));
}
case CXXConstructExprClass:
case CXXTemporaryObjectExprClass: {
CanThrowResult CT = CanCalleeThrow(C, this,
cast<CXXConstructExpr>(this)->getConstructor());
if (CT == CT_Can)
return CT;
return MergeCanThrow(CT, CanSubExprsThrow(C, this));
}
case LambdaExprClass: {
const LambdaExpr *Lambda = cast<LambdaExpr>(this);
CanThrowResult CT = Expr::CT_Cannot;
for (LambdaExpr::capture_init_iterator Cap = Lambda->capture_init_begin(),
CapEnd = Lambda->capture_init_end();
Cap != CapEnd; ++Cap)
CT = MergeCanThrow(CT, (*Cap)->CanThrow(C));
return CT;
}
case CXXNewExprClass: {
CanThrowResult CT;
if (isTypeDependent())
CT = CT_Dependent;
else
CT = CanCalleeThrow(C, this, cast<CXXNewExpr>(this)->getOperatorNew());
if (CT == CT_Can)
return CT;
return MergeCanThrow(CT, CanSubExprsThrow(C, this));
}
case CXXDeleteExprClass: {
CanThrowResult CT;
QualType DTy = cast<CXXDeleteExpr>(this)->getDestroyedType();
if (DTy.isNull() || DTy->isDependentType()) {
CT = CT_Dependent;
} else {
CT = CanCalleeThrow(C, this,
cast<CXXDeleteExpr>(this)->getOperatorDelete());
if (const RecordType *RT = DTy->getAs<RecordType>()) {
const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
CT = MergeCanThrow(CT, CanCalleeThrow(C, this, RD->getDestructor()));
}
if (CT == CT_Can)
return CT;
}
return MergeCanThrow(CT, CanSubExprsThrow(C, this));
}
case CXXBindTemporaryExprClass: {
// The bound temporary has to be destroyed again, which might throw.
CanThrowResult CT = CanCalleeThrow(C, this,
cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor());
if (CT == CT_Can)
return CT;
return MergeCanThrow(CT, CanSubExprsThrow(C, this));
}
// ObjC message sends are like function calls, but never have exception
// specs.
case ObjCMessageExprClass:
case ObjCPropertyRefExprClass:
case ObjCSubscriptRefExprClass:
return CT_Can;
// All the ObjC literals that are implemented as calls are
// potentially throwing unless we decide to close off that
// possibility.
case ObjCArrayLiteralClass:
case ObjCDictionaryLiteralClass:
case ObjCNumericLiteralClass:
return CT_Can;
// Many other things have subexpressions, so we have to test those.
// Some are simple:
case ConditionalOperatorClass:
case CompoundLiteralExprClass:
case CXXConstCastExprClass:
case CXXDefaultArgExprClass:
case CXXReinterpretCastExprClass:
case DesignatedInitExprClass:
case ExprWithCleanupsClass:
case ExtVectorElementExprClass:
case InitListExprClass:
case MemberExprClass:
case ObjCIsaExprClass:
case ObjCIvarRefExprClass:
case ParenExprClass:
case ParenListExprClass:
case ShuffleVectorExprClass:
case VAArgExprClass:
return CanSubExprsThrow(C, this);
// Some might be dependent for other reasons.
case ArraySubscriptExprClass:
case BinaryOperatorClass:
case CompoundAssignOperatorClass:
case CStyleCastExprClass:
case CXXStaticCastExprClass:
case CXXFunctionalCastExprClass:
case ImplicitCastExprClass:
case MaterializeTemporaryExprClass:
case UnaryOperatorClass: {
CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot;
return MergeCanThrow(CT, CanSubExprsThrow(C, this));
}
// FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms.
case StmtExprClass:
return CT_Can;
case ChooseExprClass:
if (isTypeDependent() || isValueDependent())
return CT_Dependent;
return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C);
case GenericSelectionExprClass:
if (cast<GenericSelectionExpr>(this)->isResultDependent())
return CT_Dependent;
return cast<GenericSelectionExpr>(this)->getResultExpr()->CanThrow(C);
// Some expressions are always dependent.
case CXXDependentScopeMemberExprClass:
case CXXUnresolvedConstructExprClass:
case DependentScopeDeclRefExprClass:
return CT_Dependent;
case AtomicExprClass:
case AsTypeExprClass:
case BinaryConditionalOperatorClass:
case BlockExprClass:
case CUDAKernelCallExprClass:
case DeclRefExprClass:
case ObjCBridgedCastExprClass:
case ObjCIndirectCopyRestoreExprClass:
case ObjCProtocolExprClass:
case ObjCSelectorExprClass:
case OffsetOfExprClass:
case PackExpansionExprClass:
case PseudoObjectExprClass:
case SubstNonTypeTemplateParmExprClass:
case SubstNonTypeTemplateParmPackExprClass:
case UnaryExprOrTypeTraitExprClass:
case UnresolvedLookupExprClass:
case UnresolvedMemberExprClass:
// FIXME: Can any of the above throw? If so, when?
return CT_Cannot;
case AddrLabelExprClass:
case ArrayTypeTraitExprClass:
case BinaryTypeTraitExprClass:
case TypeTraitExprClass:
case CXXBoolLiteralExprClass:
case CXXNoexceptExprClass:
case CXXNullPtrLiteralExprClass:
case CXXPseudoDestructorExprClass:
case CXXScalarValueInitExprClass:
case CXXThisExprClass:
case CXXUuidofExprClass:
case CharacterLiteralClass:
case ExpressionTraitExprClass:
case FloatingLiteralClass:
case GNUNullExprClass:
case ImaginaryLiteralClass:
case ImplicitValueInitExprClass:
case IntegerLiteralClass:
case ObjCEncodeExprClass:
case ObjCStringLiteralClass:
case ObjCBoolLiteralExprClass:
case OpaqueValueExprClass:
case PredefinedExprClass:
case SizeOfPackExprClass:
case StringLiteralClass:
case UnaryTypeTraitExprClass:
// These expressions can never throw.
return CT_Cannot;
#define STMT(CLASS, PARENT) case CLASS##Class:
#define STMT_RANGE(Base, First, Last)
#define LAST_STMT_RANGE(BASE, FIRST, LAST)
#define EXPR(CLASS, PARENT)
#define ABSTRACT_STMT(STMT)
#include "clang/AST/StmtNodes.inc"
case NoStmtClass:
llvm_unreachable("Invalid class for expression");
}
llvm_unreachable("Bogus StmtClass");
}
Expr* Expr::IgnoreParens() {
Expr* E = this;
while (true) {
if (ParenExpr* P = dyn_cast<ParenExpr>(E)) {
E = P->getSubExpr();
continue;
}
if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
if (P->getOpcode() == UO_Extension) {
E = P->getSubExpr();
continue;
}
}
if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) {
if (!P->isResultDependent()) {
E = P->getResultExpr();
continue;
}
}
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();
continue;
}
if (CastExpr *P = dyn_cast<CastExpr>(E)) {
E = P->getSubExpr();
continue;
}
if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
if (P->getOpcode() == UO_Extension) {
E = P->getSubExpr();
continue;
}
}
if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) {
if (!P->isResultDependent()) {
E = P->getResultExpr();
continue;
}
}
if (MaterializeTemporaryExpr *Materialize
= dyn_cast<MaterializeTemporaryExpr>(E)) {
E = Materialize->GetTemporaryExpr();
continue;
}
if (SubstNonTypeTemplateParmExpr *NTTP
= dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
E = NTTP->getReplacement();
continue;
}
return E;
}
}
/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue
/// casts. This is intended purely as a temporary workaround for code
/// that hasn't yet been rewritten to do the right thing about those
/// casts, and may disappear along with the last internal use.
Expr *Expr::IgnoreParenLValueCasts() {
Expr *E = this;
while (true) {
if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
E = P->getSubExpr();
continue;
} else if (CastExpr *P = dyn_cast<CastExpr>(E)) {
if (P->getCastKind() == CK_LValueToRValue) {
E = P->getSubExpr();
continue;
}
} else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
if (P->getOpcode() == UO_Extension) {
E = P->getSubExpr();
continue;
}
} else if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) {
if (!P->isResultDependent()) {
E = P->getResultExpr();
continue;
}
} else if (MaterializeTemporaryExpr *Materialize
= dyn_cast<MaterializeTemporaryExpr>(E)) {
E = Materialize->GetTemporaryExpr();
continue;
} else if (SubstNonTypeTemplateParmExpr *NTTP
= dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
E = NTTP->getReplacement();
continue;
}
break;
}
return E;
}
Expr *Expr::IgnoreParenImpCasts() {
Expr *E = this;
while (true) {
if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
E = P->getSubExpr();
continue;
}
if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) {
E = P->getSubExpr();
continue;
}
if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
if (P->getOpcode() == UO_Extension) {
E = P->getSubExpr();
continue;
}
}
if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) {
if (!P->isResultDependent()) {
E = P->getResultExpr();
continue;
}
}
if (MaterializeTemporaryExpr *Materialize
= dyn_cast<MaterializeTemporaryExpr>(E)) {
E = Materialize->GetTemporaryExpr();
continue;
}
if (SubstNonTypeTemplateParmExpr *NTTP
= dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
E = NTTP->getReplacement();
continue;
}
return E;
}
}
Expr *Expr::IgnoreConversionOperator() {
if (CXXMemberCallExpr *MCE = dyn_cast<CXXMemberCallExpr>(this)) {
if (MCE->getMethodDecl() && isa<CXXConversionDecl>(MCE->getMethodDecl()))
return MCE->getImplicitObjectArgument();
}
return this;
}
/// 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)) {