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Expr.cpp
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//===--- Expr.cpp - Expression AST Node Implementation --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the Expr class and subclasses.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/Expr.h"
#include "clang/AST/APValue.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTLambda.h"
#include "clang/AST/Attr.h"
#include "clang/AST/ComputeDependence.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/DependenceFlags.h"
#include "clang/AST/EvaluatedExprVisitor.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/IgnoreExpr.h"
#include "clang/AST/Mangle.h"
#include "clang/AST/RecordLayout.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Lex/Lexer.h"
#include "clang/Lex/LiteralSupport.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstring>
#include <optional>
using namespace clang;
const Expr *Expr::getBestDynamicClassTypeExpr() const {
const Expr *E = this;
while (true) {
E = E->IgnoreParenBaseCasts();
// Follow the RHS of a comma operator.
if (auto *BO = dyn_cast<BinaryOperator>(E)) {
if (BO->getOpcode() == BO_Comma) {
E = BO->getRHS();
continue;
}
}
// Step into initializer for materialized temporaries.
if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E)) {
E = MTE->getSubExpr();
continue;
}
break;
}
return E;
}
const CXXRecordDecl *Expr::getBestDynamicClassType() const {
const Expr *E = getBestDynamicClassTypeExpr();
QualType DerivedType = E->getType();
if (const PointerType *PTy = DerivedType->getAs<PointerType>())
DerivedType = PTy->getPointeeType();
if (DerivedType->isDependentType())
return nullptr;
const RecordType *Ty = DerivedType->castAs<RecordType>();
Decl *D = Ty->getDecl();
return cast<CXXRecordDecl>(D);
}
const Expr *Expr::skipRValueSubobjectAdjustments(
SmallVectorImpl<const Expr *> &CommaLHSs,
SmallVectorImpl<SubobjectAdjustment> &Adjustments) const {
const Expr *E = this;
while (true) {
E = E->IgnoreParens();
if (const auto *CE = dyn_cast<CastExpr>(E)) {
if ((CE->getCastKind() == CK_DerivedToBase ||
CE->getCastKind() == CK_UncheckedDerivedToBase) &&
E->getType()->isRecordType()) {
E = CE->getSubExpr();
const auto *Derived =
cast<CXXRecordDecl>(E->getType()->castAs<RecordType>()->getDecl());
Adjustments.push_back(SubobjectAdjustment(CE, Derived));
continue;
}
if (CE->getCastKind() == CK_NoOp) {
E = CE->getSubExpr();
continue;
}
} else if (const auto *ME = dyn_cast<MemberExpr>(E)) {
if (!ME->isArrow()) {
assert(ME->getBase()->getType()->getAsRecordDecl());
if (const auto *Field = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
if (!Field->isBitField() && !Field->getType()->isReferenceType()) {
E = ME->getBase();
Adjustments.push_back(SubobjectAdjustment(Field));
continue;
}
}
}
} else if (const auto *BO = dyn_cast<BinaryOperator>(E)) {
if (BO->getOpcode() == BO_PtrMemD) {
assert(BO->getRHS()->isPRValue());
E = BO->getLHS();
const auto *MPT = BO->getRHS()->getType()->getAs<MemberPointerType>();
Adjustments.push_back(SubobjectAdjustment(MPT, BO->getRHS()));
continue;
}
if (BO->getOpcode() == BO_Comma) {
CommaLHSs.push_back(BO->getLHS());
E = BO->getRHS();
continue;
}
}
// Nothing changed.
break;
}
return E;
}
bool Expr::isKnownToHaveBooleanValue(bool Semantic) 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(Semantic);
case UO_LNot:
return true;
default:
return false;
}
}
// Only look through implicit casts. If the user writes
// '(int) (a && b)' treat it as an arbitrary int.
// FIXME: Should we look through any cast expression in !Semantic mode?
if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E))
return CE->getSubExpr()->isKnownToHaveBooleanValue(Semantic);
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(Semantic) &&
BO->getRHS()->isKnownToHaveBooleanValue(Semantic);
case BO_Comma:
case BO_Assign:
return BO->getRHS()->isKnownToHaveBooleanValue(Semantic);
}
}
if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E))
return CO->getTrueExpr()->isKnownToHaveBooleanValue(Semantic) &&
CO->getFalseExpr()->isKnownToHaveBooleanValue(Semantic);
if (isa<ObjCBoolLiteralExpr>(E))
return true;
if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E))
return OVE->getSourceExpr()->isKnownToHaveBooleanValue(Semantic);
if (const FieldDecl *FD = E->getSourceBitField())
if (!Semantic && FD->getType()->isUnsignedIntegerType() &&
!FD->getBitWidth()->isValueDependent() && FD->getBitWidthValue() == 1)
return true;
return false;
}
bool Expr::isFlexibleArrayMemberLike(
ASTContext &Ctx,
LangOptions::StrictFlexArraysLevelKind StrictFlexArraysLevel,
bool IgnoreTemplateOrMacroSubstitution) const {
const Expr *E = IgnoreParens();
const Decl *D = nullptr;
if (const auto *ME = dyn_cast<MemberExpr>(E))
D = ME->getMemberDecl();
else if (const auto *DRE = dyn_cast<DeclRefExpr>(E))
D = DRE->getDecl();
else if (const auto *IRE = dyn_cast<ObjCIvarRefExpr>(E))
D = IRE->getDecl();
return Decl::isFlexibleArrayMemberLike(Ctx, D, E->getType(),
StrictFlexArraysLevel,
IgnoreTemplateOrMacroSubstitution);
}
const ValueDecl *
Expr::getAsBuiltinConstantDeclRef(const ASTContext &Context) const {
Expr::EvalResult Eval;
if (EvaluateAsConstantExpr(Eval, Context)) {
APValue &Value = Eval.Val;
if (Value.isMemberPointer())
return Value.getMemberPointerDecl();
if (Value.isLValue() && Value.getLValueOffset().isZero())
return Value.getLValueBase().dyn_cast<const ValueDecl *>();
}
return nullptr;
}
// Amusing macro metaprogramming hack: check whether a class provides
// a more specific implementation of getExprLoc().
//
// See also Stmt.cpp:{getBeginLoc(),getEndLoc()}.
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)->getBeginLoc();
}
}
QualType Expr::getEnumCoercedType(const ASTContext &Ctx) const {
if (isa<EnumType>(getType()))
return getType();
if (const auto *ECD = getEnumConstantDecl()) {
const auto *ED = cast<EnumDecl>(ECD->getDeclContext());
if (ED->isCompleteDefinition())
return Ctx.getTypeDeclType(ED);
}
return getType();
}
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: break;
#define EXPR(type, base) \
case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc);
#include "clang/AST/StmtNodes.inc"
}
llvm_unreachable("unknown expression kind");
}
//===----------------------------------------------------------------------===//
// Primary Expressions.
//===----------------------------------------------------------------------===//
static void AssertResultStorageKind(ConstantResultStorageKind Kind) {
assert((Kind == ConstantResultStorageKind::APValue ||
Kind == ConstantResultStorageKind::Int64 ||
Kind == ConstantResultStorageKind::None) &&
"Invalid StorageKind Value");
(void)Kind;
}
ConstantResultStorageKind ConstantExpr::getStorageKind(const APValue &Value) {
switch (Value.getKind()) {
case APValue::None:
case APValue::Indeterminate:
return ConstantResultStorageKind::None;
case APValue::Int:
if (!Value.getInt().needsCleanup())
return ConstantResultStorageKind::Int64;
[[fallthrough]];
default:
return ConstantResultStorageKind::APValue;
}
}
ConstantResultStorageKind
ConstantExpr::getStorageKind(const Type *T, const ASTContext &Context) {
if (T->isIntegralOrEnumerationType() && Context.getTypeInfo(T).Width <= 64)
return ConstantResultStorageKind::Int64;
return ConstantResultStorageKind::APValue;
}
ConstantExpr::ConstantExpr(Expr *SubExpr, ConstantResultStorageKind StorageKind,
bool IsImmediateInvocation)
: FullExpr(ConstantExprClass, SubExpr) {
ConstantExprBits.ResultKind = llvm::to_underlying(StorageKind);
ConstantExprBits.APValueKind = APValue::None;
ConstantExprBits.IsUnsigned = false;
ConstantExprBits.BitWidth = 0;
ConstantExprBits.HasCleanup = false;
ConstantExprBits.IsImmediateInvocation = IsImmediateInvocation;
if (StorageKind == ConstantResultStorageKind::APValue)
::new (getTrailingObjects<APValue>()) APValue();
}
ConstantExpr *ConstantExpr::Create(const ASTContext &Context, Expr *E,
ConstantResultStorageKind StorageKind,
bool IsImmediateInvocation) {
assert(!isa<ConstantExpr>(E));
AssertResultStorageKind(StorageKind);
unsigned Size = totalSizeToAlloc<APValue, uint64_t>(
StorageKind == ConstantResultStorageKind::APValue,
StorageKind == ConstantResultStorageKind::Int64);
void *Mem = Context.Allocate(Size, alignof(ConstantExpr));
return new (Mem) ConstantExpr(E, StorageKind, IsImmediateInvocation);
}
ConstantExpr *ConstantExpr::Create(const ASTContext &Context, Expr *E,
const APValue &Result) {
ConstantResultStorageKind StorageKind = getStorageKind(Result);
ConstantExpr *Self = Create(Context, E, StorageKind);
Self->SetResult(Result, Context);
return Self;
}
ConstantExpr::ConstantExpr(EmptyShell Empty,
ConstantResultStorageKind StorageKind)
: FullExpr(ConstantExprClass, Empty) {
ConstantExprBits.ResultKind = llvm::to_underlying(StorageKind);
if (StorageKind == ConstantResultStorageKind::APValue)
::new (getTrailingObjects<APValue>()) APValue();
}
ConstantExpr *ConstantExpr::CreateEmpty(const ASTContext &Context,
ConstantResultStorageKind StorageKind) {
AssertResultStorageKind(StorageKind);
unsigned Size = totalSizeToAlloc<APValue, uint64_t>(
StorageKind == ConstantResultStorageKind::APValue,
StorageKind == ConstantResultStorageKind::Int64);
void *Mem = Context.Allocate(Size, alignof(ConstantExpr));
return new (Mem) ConstantExpr(EmptyShell(), StorageKind);
}
void ConstantExpr::MoveIntoResult(APValue &Value, const ASTContext &Context) {
assert((unsigned)getStorageKind(Value) <= ConstantExprBits.ResultKind &&
"Invalid storage for this value kind");
ConstantExprBits.APValueKind = Value.getKind();
switch (getResultStorageKind()) {
case ConstantResultStorageKind::None:
return;
case ConstantResultStorageKind::Int64:
Int64Result() = *Value.getInt().getRawData();
ConstantExprBits.BitWidth = Value.getInt().getBitWidth();
ConstantExprBits.IsUnsigned = Value.getInt().isUnsigned();
return;
case ConstantResultStorageKind::APValue:
if (!ConstantExprBits.HasCleanup && Value.needsCleanup()) {
ConstantExprBits.HasCleanup = true;
Context.addDestruction(&APValueResult());
}
APValueResult() = std::move(Value);
return;
}
llvm_unreachable("Invalid ResultKind Bits");
}
llvm::APSInt ConstantExpr::getResultAsAPSInt() const {
switch (getResultStorageKind()) {
case ConstantResultStorageKind::APValue:
return APValueResult().getInt();
case ConstantResultStorageKind::Int64:
return llvm::APSInt(llvm::APInt(ConstantExprBits.BitWidth, Int64Result()),
ConstantExprBits.IsUnsigned);
default:
llvm_unreachable("invalid Accessor");
}
}
APValue ConstantExpr::getAPValueResult() const {
switch (getResultStorageKind()) {
case ConstantResultStorageKind::APValue:
return APValueResult();
case ConstantResultStorageKind::Int64:
return APValue(
llvm::APSInt(llvm::APInt(ConstantExprBits.BitWidth, Int64Result()),
ConstantExprBits.IsUnsigned));
case ConstantResultStorageKind::None:
if (ConstantExprBits.APValueKind == APValue::Indeterminate)
return APValue::IndeterminateValue();
return APValue();
}
llvm_unreachable("invalid ResultKind");
}
DeclRefExpr::DeclRefExpr(const ASTContext &Ctx, ValueDecl *D,
bool RefersToEnclosingVariableOrCapture, QualType T,
ExprValueKind VK, SourceLocation L,
const DeclarationNameLoc &LocInfo,
NonOdrUseReason NOUR)
: Expr(DeclRefExprClass, T, VK, OK_Ordinary), D(D), DNLoc(LocInfo) {
DeclRefExprBits.HasQualifier = false;
DeclRefExprBits.HasTemplateKWAndArgsInfo = false;
DeclRefExprBits.HasFoundDecl = false;
DeclRefExprBits.HadMultipleCandidates = false;
DeclRefExprBits.RefersToEnclosingVariableOrCapture =
RefersToEnclosingVariableOrCapture;
DeclRefExprBits.CapturedByCopyInLambdaWithExplicitObjectParameter = false;
DeclRefExprBits.NonOdrUseReason = NOUR;
DeclRefExprBits.IsImmediateEscalating = false;
DeclRefExprBits.Loc = L;
setDependence(computeDependence(this, Ctx));
}
DeclRefExpr::DeclRefExpr(const ASTContext &Ctx,
NestedNameSpecifierLoc QualifierLoc,
SourceLocation TemplateKWLoc, ValueDecl *D,
bool RefersToEnclosingVariableOrCapture,
const DeclarationNameInfo &NameInfo, NamedDecl *FoundD,
const TemplateArgumentListInfo *TemplateArgs,
QualType T, ExprValueKind VK, NonOdrUseReason NOUR)
: Expr(DeclRefExprClass, T, VK, OK_Ordinary), D(D),
DNLoc(NameInfo.getInfo()) {
DeclRefExprBits.Loc = NameInfo.getLoc();
DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0;
if (QualifierLoc)
new (getTrailingObjects<NestedNameSpecifierLoc>())
NestedNameSpecifierLoc(QualifierLoc);
DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0;
if (FoundD)
*getTrailingObjects<NamedDecl *>() = FoundD;
DeclRefExprBits.HasTemplateKWAndArgsInfo
= (TemplateArgs || TemplateKWLoc.isValid()) ? 1 : 0;
DeclRefExprBits.RefersToEnclosingVariableOrCapture =
RefersToEnclosingVariableOrCapture;
DeclRefExprBits.CapturedByCopyInLambdaWithExplicitObjectParameter = false;
DeclRefExprBits.NonOdrUseReason = NOUR;
if (TemplateArgs) {
auto Deps = TemplateArgumentDependence::None;
getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
TemplateKWLoc, *TemplateArgs, getTrailingObjects<TemplateArgumentLoc>(),
Deps);
assert(!(Deps & TemplateArgumentDependence::Dependent) &&
"built a DeclRefExpr with dependent template args");
} else if (TemplateKWLoc.isValid()) {
getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
TemplateKWLoc);
}
DeclRefExprBits.IsImmediateEscalating = false;
DeclRefExprBits.HadMultipleCandidates = 0;
setDependence(computeDependence(this, Ctx));
}
DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
NestedNameSpecifierLoc QualifierLoc,
SourceLocation TemplateKWLoc, ValueDecl *D,
bool RefersToEnclosingVariableOrCapture,
SourceLocation NameLoc, QualType T,
ExprValueKind VK, NamedDecl *FoundD,
const TemplateArgumentListInfo *TemplateArgs,
NonOdrUseReason NOUR) {
return Create(Context, QualifierLoc, TemplateKWLoc, D,
RefersToEnclosingVariableOrCapture,
DeclarationNameInfo(D->getDeclName(), NameLoc),
T, VK, FoundD, TemplateArgs, NOUR);
}
DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
NestedNameSpecifierLoc QualifierLoc,
SourceLocation TemplateKWLoc, ValueDecl *D,
bool RefersToEnclosingVariableOrCapture,
const DeclarationNameInfo &NameInfo,
QualType T, ExprValueKind VK,
NamedDecl *FoundD,
const TemplateArgumentListInfo *TemplateArgs,
NonOdrUseReason NOUR) {
// Filter out cases where the found Decl is the same as the value refenenced.
if (D == FoundD)
FoundD = nullptr;
bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
std::size_t Size =
totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
QualifierLoc ? 1 : 0, FoundD ? 1 : 0,
HasTemplateKWAndArgsInfo ? 1 : 0,
TemplateArgs ? TemplateArgs->size() : 0);
void *Mem = Context.Allocate(Size, alignof(DeclRefExpr));
return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D,
RefersToEnclosingVariableOrCapture, NameInfo,
FoundD, TemplateArgs, T, VK, NOUR);
}
DeclRefExpr *DeclRefExpr::CreateEmpty(const ASTContext &Context,
bool HasQualifier,
bool HasFoundDecl,
bool HasTemplateKWAndArgsInfo,
unsigned NumTemplateArgs) {
assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
std::size_t Size =
totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
HasQualifier ? 1 : 0, HasFoundDecl ? 1 : 0, HasTemplateKWAndArgsInfo,
NumTemplateArgs);
void *Mem = Context.Allocate(Size, alignof(DeclRefExpr));
return new (Mem) DeclRefExpr(EmptyShell());
}
void DeclRefExpr::setDecl(ValueDecl *NewD) {
D = NewD;
if (getType()->isUndeducedType())
setType(NewD->getType());
setDependence(computeDependence(this, NewD->getASTContext()));
}
SourceLocation DeclRefExpr::getBeginLoc() const {
if (hasQualifier())
return getQualifierLoc().getBeginLoc();
return getNameInfo().getBeginLoc();
}
SourceLocation DeclRefExpr::getEndLoc() const {
if (hasExplicitTemplateArgs())
return getRAngleLoc();
return getNameInfo().getEndLoc();
}
SYCLUniqueStableNameExpr::SYCLUniqueStableNameExpr(SourceLocation OpLoc,
SourceLocation LParen,
SourceLocation RParen,
QualType ResultTy,
TypeSourceInfo *TSI)
: Expr(SYCLUniqueStableNameExprClass, ResultTy, VK_PRValue, OK_Ordinary),
OpLoc(OpLoc), LParen(LParen), RParen(RParen) {
setTypeSourceInfo(TSI);
setDependence(computeDependence(this));
}
SYCLUniqueStableNameExpr::SYCLUniqueStableNameExpr(EmptyShell Empty,
QualType ResultTy)
: Expr(SYCLUniqueStableNameExprClass, ResultTy, VK_PRValue, OK_Ordinary) {}
SYCLUniqueStableNameExpr *
SYCLUniqueStableNameExpr::Create(const ASTContext &Ctx, SourceLocation OpLoc,
SourceLocation LParen, SourceLocation RParen,
TypeSourceInfo *TSI) {
QualType ResultTy = Ctx.getPointerType(Ctx.CharTy.withConst());
return new (Ctx)
SYCLUniqueStableNameExpr(OpLoc, LParen, RParen, ResultTy, TSI);
}
SYCLUniqueStableNameExpr *
SYCLUniqueStableNameExpr::CreateEmpty(const ASTContext &Ctx) {
QualType ResultTy = Ctx.getPointerType(Ctx.CharTy.withConst());
return new (Ctx) SYCLUniqueStableNameExpr(EmptyShell(), ResultTy);
}
std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context) const {
return SYCLUniqueStableNameExpr::ComputeName(Context,
getTypeSourceInfo()->getType());
}
std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context,
QualType Ty) {
auto MangleCallback = [](ASTContext &Ctx,
const NamedDecl *ND) -> std::optional<unsigned> {
if (const auto *RD = dyn_cast<CXXRecordDecl>(ND))
return RD->getDeviceLambdaManglingNumber();
return std::nullopt;
};
std::unique_ptr<MangleContext> Ctx{ItaniumMangleContext::create(
Context, Context.getDiagnostics(), MangleCallback)};
std::string Buffer;
Buffer.reserve(128);
llvm::raw_string_ostream Out(Buffer);
Ctx->mangleCanonicalTypeName(Ty, Out);
return Buffer;
}
PredefinedExpr::PredefinedExpr(SourceLocation L, QualType FNTy,
PredefinedIdentKind IK, bool IsTransparent,
StringLiteral *SL)
: Expr(PredefinedExprClass, FNTy, VK_LValue, OK_Ordinary) {
PredefinedExprBits.Kind = llvm::to_underlying(IK);
assert((getIdentKind() == IK) &&
"IdentKind do not fit in PredefinedExprBitfields!");
bool HasFunctionName = SL != nullptr;
PredefinedExprBits.HasFunctionName = HasFunctionName;
PredefinedExprBits.IsTransparent = IsTransparent;
PredefinedExprBits.Loc = L;
if (HasFunctionName)
setFunctionName(SL);
setDependence(computeDependence(this));
}
PredefinedExpr::PredefinedExpr(EmptyShell Empty, bool HasFunctionName)
: Expr(PredefinedExprClass, Empty) {
PredefinedExprBits.HasFunctionName = HasFunctionName;
}
PredefinedExpr *PredefinedExpr::Create(const ASTContext &Ctx, SourceLocation L,
QualType FNTy, PredefinedIdentKind IK,
bool IsTransparent, StringLiteral *SL) {
bool HasFunctionName = SL != nullptr;
void *Mem = Ctx.Allocate(totalSizeToAlloc<Stmt *>(HasFunctionName),
alignof(PredefinedExpr));
return new (Mem) PredefinedExpr(L, FNTy, IK, IsTransparent, SL);
}
PredefinedExpr *PredefinedExpr::CreateEmpty(const ASTContext &Ctx,
bool HasFunctionName) {
void *Mem = Ctx.Allocate(totalSizeToAlloc<Stmt *>(HasFunctionName),
alignof(PredefinedExpr));
return new (Mem) PredefinedExpr(EmptyShell(), HasFunctionName);
}
StringRef PredefinedExpr::getIdentKindName(PredefinedIdentKind IK) {
switch (IK) {
case PredefinedIdentKind::Func:
return "__func__";
case PredefinedIdentKind::Function:
return "__FUNCTION__";
case PredefinedIdentKind::FuncDName:
return "__FUNCDNAME__";
case PredefinedIdentKind::LFunction:
return "L__FUNCTION__";
case PredefinedIdentKind::PrettyFunction:
return "__PRETTY_FUNCTION__";
case PredefinedIdentKind::FuncSig:
return "__FUNCSIG__";
case PredefinedIdentKind::LFuncSig:
return "L__FUNCSIG__";
case PredefinedIdentKind::PrettyFunctionNoVirtual:
break;
}
llvm_unreachable("Unknown ident kind for PredefinedExpr");
}
// FIXME: Maybe this should use DeclPrinter with a special "print predefined
// expr" policy instead.
std::string PredefinedExpr::ComputeName(PredefinedIdentKind IK,
const Decl *CurrentDecl,
bool ForceElaboratedPrinting) {
ASTContext &Context = CurrentDecl->getASTContext();
if (IK == PredefinedIdentKind::FuncDName) {
if (const NamedDecl *ND = dyn_cast<NamedDecl>(CurrentDecl)) {
std::unique_ptr<MangleContext> MC;
MC.reset(Context.createMangleContext());
if (MC->shouldMangleDeclName(ND)) {
SmallString<256> Buffer;
llvm::raw_svector_ostream Out(Buffer);
GlobalDecl GD;
if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(ND))
GD = GlobalDecl(CD, Ctor_Base);
else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(ND))
GD = GlobalDecl(DD, Dtor_Base);
else if (ND->hasAttr<CUDAGlobalAttr>())
GD = GlobalDecl(cast<FunctionDecl>(ND));
else
GD = GlobalDecl(ND);
MC->mangleName(GD, Out);
if (!Buffer.empty() && Buffer.front() == '\01')
return std::string(Buffer.substr(1));
return std::string(Buffer);
}
return std::string(ND->getIdentifier()->getName());
}
return "";
}
if (isa<BlockDecl>(CurrentDecl)) {
// For blocks we only emit something if it is enclosed in a function
// For top-level block we'd like to include the name of variable, but we
// don't have it at this point.
auto DC = CurrentDecl->getDeclContext();
if (DC->isFileContext())
return "";
SmallString<256> Buffer;
llvm::raw_svector_ostream Out(Buffer);
if (auto *DCBlock = dyn_cast<BlockDecl>(DC))
// For nested blocks, propagate up to the parent.
Out << ComputeName(IK, DCBlock);
else if (auto *DCDecl = dyn_cast<Decl>(DC))
Out << ComputeName(IK, DCDecl) << "_block_invoke";
return std::string(Out.str());
}
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) {
const auto &LO = Context.getLangOpts();
bool IsFuncOrFunctionInNonMSVCCompatEnv =
((IK == PredefinedIdentKind::Func ||
IK == PredefinedIdentKind ::Function) &&
!LO.MSVCCompat);
bool IsLFunctionInMSVCCommpatEnv =
IK == PredefinedIdentKind::LFunction && LO.MSVCCompat;
bool IsFuncOrFunctionOrLFunctionOrFuncDName =
IK != PredefinedIdentKind::PrettyFunction &&
IK != PredefinedIdentKind::PrettyFunctionNoVirtual &&
IK != PredefinedIdentKind::FuncSig &&
IK != PredefinedIdentKind::LFuncSig;
if ((ForceElaboratedPrinting &&
(IsFuncOrFunctionInNonMSVCCompatEnv || IsLFunctionInMSVCCommpatEnv)) ||
(!ForceElaboratedPrinting && IsFuncOrFunctionOrLFunctionOrFuncDName))
return FD->getNameAsString();
SmallString<256> Name;
llvm::raw_svector_ostream Out(Name);
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
if (MD->isVirtual() && IK != PredefinedIdentKind::PrettyFunctionNoVirtual)
Out << "virtual ";
if (MD->isStatic())
Out << "static ";
}
class PrettyCallbacks final : public PrintingCallbacks {
public:
PrettyCallbacks(const LangOptions &LO) : LO(LO) {}
std::string remapPath(StringRef Path) const override {
SmallString<128> p(Path);
LO.remapPathPrefix(p);
return std::string(p);
}
private:
const LangOptions &LO;
};
PrintingPolicy Policy(Context.getLangOpts());
PrettyCallbacks PrettyCB(Context.getLangOpts());
Policy.Callbacks = &PrettyCB;
if (IK == PredefinedIdentKind::Function && ForceElaboratedPrinting)
Policy.SuppressTagKeyword = !LO.MSVCCompat;
std::string Proto;
llvm::raw_string_ostream POut(Proto);
const FunctionDecl *Decl = FD;
if (const FunctionDecl* Pattern = FD->getTemplateInstantiationPattern())
Decl = Pattern;
// Bail out if the type of the function has not been set yet.
// This can notably happen in the trailing return type of a lambda
// expression.
const Type *Ty = Decl->getType().getTypePtrOrNull();
if (!Ty)
return "";
const FunctionType *AFT = Ty->getAs<FunctionType>();
const FunctionProtoType *FT = nullptr;
if (FD->hasWrittenPrototype())
FT = dyn_cast<FunctionProtoType>(AFT);
if (IK == PredefinedIdentKind::FuncSig ||
IK == PredefinedIdentKind::LFuncSig) {
switch (AFT->getCallConv()) {
case CC_C: POut << "__cdecl "; break;
case CC_X86StdCall: POut << "__stdcall "; break;
case CC_X86FastCall: POut << "__fastcall "; break;
case CC_X86ThisCall: POut << "__thiscall "; break;
case CC_X86VectorCall: POut << "__vectorcall "; break;
case CC_X86RegCall: POut << "__regcall "; break;
// Only bother printing the conventions that MSVC knows about.
default: break;
}
}
FD->printQualifiedName(POut, Policy);
if (IK == PredefinedIdentKind::Function) {
Out << Proto;
return std::string(Name);
}
POut << "(";
if (FT) {
for (unsigned i = 0, e = Decl->getNumParams(); i != e; ++i) {
if (i) POut << ", ";
POut << Decl->getParamDecl(i)->getType().stream(Policy);
}
if (FT->isVariadic()) {
if (FD->getNumParams()) POut << ", ";
POut << "...";
} else if ((IK == PredefinedIdentKind::FuncSig ||
IK == PredefinedIdentKind::LFuncSig ||
!Context.getLangOpts().CPlusPlus) &&
!Decl->getNumParams()) {
POut << "void";
}
}
POut << ")";
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
assert(FT && "We must have a written prototype in this case.");
if (FT->isConst())
POut << " const";
if (FT->isVolatile())
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 (isa_and_nonnull<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 (const ClassTemplateSpecializationDecl *D : llvm::reverse(Specs)) {
const TemplateParameterList *Params =
D->getSpecializedTemplate()->getTemplateParameters();
const TemplateArgumentList &Args = D->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,
TemplateParameterList::shouldIncludeTypeForArgument(
Policy, Params, i));
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, /*IncludeType*/ true);
TOut << ", ";
}
}
if (!TemplateParams.empty()) {
// remove the trailing comma and space
TemplateParams.resize(TemplateParams.size() - 2);
POut << " [" << TemplateParams << "]";
}
// Print "auto" for all deduced return types. This includes C++1y return
// type deduction and lambdas. For trailing return types resolve the
// decltype expression. Otherwise print the real type when this is
// not a constructor or destructor.
if (isLambdaMethod(FD))
Proto = "auto " + Proto;
else if (FT && FT->getReturnType()->getAs<DecltypeType>())
FT->getReturnType()
->getAs<DecltypeType>()
->getUnderlyingType()
.getAsStringInternal(Proto, Policy);
else if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD))
AFT->getReturnType().getAsStringInternal(Proto, Policy);
Out << Proto;
return std::string(Name);
}
if (const CapturedDecl *CD = dyn_cast<CapturedDecl>(CurrentDecl)) {
for (const DeclContext *DC = CD->getParent(); DC; DC = DC->getParent())
// Skip to its enclosing function or method, but not its enclosing
// CapturedDecl.
if (DC->isFunctionOrMethod() && (DC->getDeclKind() != Decl::Captured)) {
const Decl *D = Decl::castFromDeclContext(DC);
return ComputeName(IK, D);
}
llvm_unreachable("CapturedDecl not inside a function or method");
}
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 << ' ';
MD->getSelector().print(Out);
Out << ']';
return std::string(Name);
}
if (isa<TranslationUnitDecl>(CurrentDecl) &&
IK == PredefinedIdentKind::PrettyFunction) {
// __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
return "top level";
}
return "";
}
void APNumericStorage::setIntValue(const 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(const ASTContext &C, const llvm::APInt &V,
QualType type, SourceLocation l)
: Expr(IntegerLiteralClass, type, VK_PRValue, OK_Ordinary), Loc(l) {
assert(type->isIntegerType() && "Illegal type in IntegerLiteral");
assert(V.getBitWidth() == C.getIntWidth(type) &&
"Integer type is not the correct size for constant.");
setValue(C, V);
setDependence(ExprDependence::None);
}
IntegerLiteral *
IntegerLiteral::Create(const ASTContext &C, const llvm::APInt &V,
QualType type, SourceLocation l) {
return new (C) IntegerLiteral(C, V, type, l);
}
IntegerLiteral *
IntegerLiteral::Create(const ASTContext &C, EmptyShell Empty) {
return new (C) IntegerLiteral(Empty);
}
FixedPointLiteral::FixedPointLiteral(const ASTContext &C, const llvm::APInt &V,
QualType type, SourceLocation l,
unsigned Scale)
: Expr(FixedPointLiteralClass, type, VK_PRValue, OK_Ordinary), Loc(l),
Scale(Scale) {
assert(type->isFixedPointType() && "Illegal type in FixedPointLiteral");
assert(V.getBitWidth() == C.getTypeInfo(type).Width &&
"Fixed point type is not the correct size for constant.");
setValue(C, V);
setDependence(ExprDependence::None);
}