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CGExprScalar.cpp
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//===--- CGExprScalar.cpp - Emit LLVM Code for Scalar Exprs ---------------===//
//
// 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 contains code to emit Expr nodes with scalar LLVM types as LLVM code.
//
//===----------------------------------------------------------------------===//
#include "CGCXXABI.h"
#include "CGCleanup.h"
#include "CGDebugInfo.h"
#include "CGObjCRuntime.h"
#include "CGOpenMPRuntime.h"
#include "CGRecordLayout.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "ConstantEmitter.h"
#include "TargetInfo.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ParentMapContext.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Basic/CodeGenOptions.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/APFixedPoint.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/FixedPointBuilder.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GEPNoWrapFlags.h"
#include "llvm/IR/GetElementPtrTypeIterator.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsPowerPC.h"
#include "llvm/IR/MatrixBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/TypeSize.h"
#include <cstdarg>
#include <optional>
using namespace clang;
using namespace CodeGen;
using llvm::Value;
//===----------------------------------------------------------------------===//
// Scalar Expression Emitter
//===----------------------------------------------------------------------===//
namespace llvm {
extern cl::opt<bool> EnableSingleByteCoverage;
} // namespace llvm
namespace {
/// Determine whether the given binary operation may overflow.
/// Sets \p Result to the value of the operation for BO_Add, BO_Sub, BO_Mul,
/// and signed BO_{Div,Rem}. For these opcodes, and for unsigned BO_{Div,Rem},
/// the returned overflow check is precise. The returned value is 'true' for
/// all other opcodes, to be conservative.
bool mayHaveIntegerOverflow(llvm::ConstantInt *LHS, llvm::ConstantInt *RHS,
BinaryOperator::Opcode Opcode, bool Signed,
llvm::APInt &Result) {
// Assume overflow is possible, unless we can prove otherwise.
bool Overflow = true;
const auto &LHSAP = LHS->getValue();
const auto &RHSAP = RHS->getValue();
if (Opcode == BO_Add) {
Result = Signed ? LHSAP.sadd_ov(RHSAP, Overflow)
: LHSAP.uadd_ov(RHSAP, Overflow);
} else if (Opcode == BO_Sub) {
Result = Signed ? LHSAP.ssub_ov(RHSAP, Overflow)
: LHSAP.usub_ov(RHSAP, Overflow);
} else if (Opcode == BO_Mul) {
Result = Signed ? LHSAP.smul_ov(RHSAP, Overflow)
: LHSAP.umul_ov(RHSAP, Overflow);
} else if (Opcode == BO_Div || Opcode == BO_Rem) {
if (Signed && !RHS->isZero())
Result = LHSAP.sdiv_ov(RHSAP, Overflow);
else
return false;
}
return Overflow;
}
struct BinOpInfo {
Value *LHS;
Value *RHS;
QualType Ty; // Computation Type.
BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform
FPOptions FPFeatures;
const Expr *E; // Entire expr, for error unsupported. May not be binop.
/// Check if the binop can result in integer overflow.
bool mayHaveIntegerOverflow() const {
// Without constant input, we can't rule out overflow.
auto *LHSCI = dyn_cast<llvm::ConstantInt>(LHS);
auto *RHSCI = dyn_cast<llvm::ConstantInt>(RHS);
if (!LHSCI || !RHSCI)
return true;
llvm::APInt Result;
return ::mayHaveIntegerOverflow(
LHSCI, RHSCI, Opcode, Ty->hasSignedIntegerRepresentation(), Result);
}
/// Check if the binop computes a division or a remainder.
bool isDivremOp() const {
return Opcode == BO_Div || Opcode == BO_Rem || Opcode == BO_DivAssign ||
Opcode == BO_RemAssign;
}
/// Check if the binop can result in an integer division by zero.
bool mayHaveIntegerDivisionByZero() const {
if (isDivremOp())
if (auto *CI = dyn_cast<llvm::ConstantInt>(RHS))
return CI->isZero();
return true;
}
/// Check if the binop can result in a float division by zero.
bool mayHaveFloatDivisionByZero() const {
if (isDivremOp())
if (auto *CFP = dyn_cast<llvm::ConstantFP>(RHS))
return CFP->isZero();
return true;
}
/// Check if at least one operand is a fixed point type. In such cases, this
/// operation did not follow usual arithmetic conversion and both operands
/// might not be of the same type.
bool isFixedPointOp() const {
// We cannot simply check the result type since comparison operations return
// an int.
if (const auto *BinOp = dyn_cast<BinaryOperator>(E)) {
QualType LHSType = BinOp->getLHS()->getType();
QualType RHSType = BinOp->getRHS()->getType();
return LHSType->isFixedPointType() || RHSType->isFixedPointType();
}
if (const auto *UnOp = dyn_cast<UnaryOperator>(E))
return UnOp->getSubExpr()->getType()->isFixedPointType();
return false;
}
/// Check if the RHS has a signed integer representation.
bool rhsHasSignedIntegerRepresentation() const {
if (const auto *BinOp = dyn_cast<BinaryOperator>(E)) {
QualType RHSType = BinOp->getRHS()->getType();
return RHSType->hasSignedIntegerRepresentation();
}
return false;
}
};
static bool MustVisitNullValue(const Expr *E) {
// If a null pointer expression's type is the C++0x nullptr_t, then
// it's not necessarily a simple constant and it must be evaluated
// for its potential side effects.
return E->getType()->isNullPtrType();
}
/// If \p E is a widened promoted integer, get its base (unpromoted) type.
static std::optional<QualType> getUnwidenedIntegerType(const ASTContext &Ctx,
const Expr *E) {
const Expr *Base = E->IgnoreImpCasts();
if (E == Base)
return std::nullopt;
QualType BaseTy = Base->getType();
if (!Ctx.isPromotableIntegerType(BaseTy) ||
Ctx.getTypeSize(BaseTy) >= Ctx.getTypeSize(E->getType()))
return std::nullopt;
return BaseTy;
}
/// Check if \p E is a widened promoted integer.
static bool IsWidenedIntegerOp(const ASTContext &Ctx, const Expr *E) {
return getUnwidenedIntegerType(Ctx, E).has_value();
}
/// Check if we can skip the overflow check for \p Op.
static bool CanElideOverflowCheck(const ASTContext &Ctx, const BinOpInfo &Op) {
assert((isa<UnaryOperator>(Op.E) || isa<BinaryOperator>(Op.E)) &&
"Expected a unary or binary operator");
// If the binop has constant inputs and we can prove there is no overflow,
// we can elide the overflow check.
if (!Op.mayHaveIntegerOverflow())
return true;
if (Op.Ty->isSignedIntegerType() &&
Ctx.isTypeIgnoredBySanitizer(SanitizerKind::SignedIntegerOverflow,
Op.Ty)) {
return true;
}
if (Op.Ty->isUnsignedIntegerType() &&
Ctx.isTypeIgnoredBySanitizer(SanitizerKind::UnsignedIntegerOverflow,
Op.Ty)) {
return true;
}
const UnaryOperator *UO = dyn_cast<UnaryOperator>(Op.E);
if (UO && UO->getOpcode() == UO_Minus &&
Ctx.getLangOpts().isOverflowPatternExcluded(
LangOptions::OverflowPatternExclusionKind::NegUnsignedConst) &&
UO->isIntegerConstantExpr(Ctx))
return true;
// If a unary op has a widened operand, the op cannot overflow.
if (UO)
return !UO->canOverflow();
// We usually don't need overflow checks for binops with widened operands.
// Multiplication with promoted unsigned operands is a special case.
const auto *BO = cast<BinaryOperator>(Op.E);
if (BO->hasExcludedOverflowPattern())
return true;
auto OptionalLHSTy = getUnwidenedIntegerType(Ctx, BO->getLHS());
if (!OptionalLHSTy)
return false;
auto OptionalRHSTy = getUnwidenedIntegerType(Ctx, BO->getRHS());
if (!OptionalRHSTy)
return false;
QualType LHSTy = *OptionalLHSTy;
QualType RHSTy = *OptionalRHSTy;
// This is the simple case: binops without unsigned multiplication, and with
// widened operands. No overflow check is needed here.
if ((Op.Opcode != BO_Mul && Op.Opcode != BO_MulAssign) ||
!LHSTy->isUnsignedIntegerType() || !RHSTy->isUnsignedIntegerType())
return true;
// For unsigned multiplication the overflow check can be elided if either one
// of the unpromoted types are less than half the size of the promoted type.
unsigned PromotedSize = Ctx.getTypeSize(Op.E->getType());
return (2 * Ctx.getTypeSize(LHSTy)) < PromotedSize ||
(2 * Ctx.getTypeSize(RHSTy)) < PromotedSize;
}
class ScalarExprEmitter
: public StmtVisitor<ScalarExprEmitter, Value*> {
CodeGenFunction &CGF;
CGBuilderTy &Builder;
bool IgnoreResultAssign;
llvm::LLVMContext &VMContext;
public:
ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false)
: CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira),
VMContext(cgf.getLLVMContext()) {
}
//===--------------------------------------------------------------------===//
// Utilities
//===--------------------------------------------------------------------===//
bool TestAndClearIgnoreResultAssign() {
bool I = IgnoreResultAssign;
IgnoreResultAssign = false;
return I;
}
llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); }
LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); }
LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) {
return CGF.EmitCheckedLValue(E, TCK);
}
void EmitBinOpCheck(ArrayRef<std::pair<Value *, SanitizerMask>> Checks,
const BinOpInfo &Info);
Value *EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
return CGF.EmitLoadOfLValue(LV, Loc).getScalarVal();
}
void EmitLValueAlignmentAssumption(const Expr *E, Value *V) {
const AlignValueAttr *AVAttr = nullptr;
if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
const ValueDecl *VD = DRE->getDecl();
if (VD->getType()->isReferenceType()) {
if (const auto *TTy =
VD->getType().getNonReferenceType()->getAs<TypedefType>())
AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
} else {
// Assumptions for function parameters are emitted at the start of the
// function, so there is no need to repeat that here,
// unless the alignment-assumption sanitizer is enabled,
// then we prefer the assumption over alignment attribute
// on IR function param.
if (isa<ParmVarDecl>(VD) && !CGF.SanOpts.has(SanitizerKind::Alignment))
return;
AVAttr = VD->getAttr<AlignValueAttr>();
}
}
if (!AVAttr)
if (const auto *TTy = E->getType()->getAs<TypedefType>())
AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
if (!AVAttr)
return;
Value *AlignmentValue = CGF.EmitScalarExpr(AVAttr->getAlignment());
llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(AlignmentValue);
CGF.emitAlignmentAssumption(V, E, AVAttr->getLocation(), AlignmentCI);
}
/// EmitLoadOfLValue - Given an expression with complex type that represents a
/// value l-value, this method emits the address of the l-value, then loads
/// and returns the result.
Value *EmitLoadOfLValue(const Expr *E) {
Value *V = EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load),
E->getExprLoc());
EmitLValueAlignmentAssumption(E, V);
return V;
}
/// EmitConversionToBool - Convert the specified expression value to a
/// boolean (i1) truth value. This is equivalent to "Val != 0".
Value *EmitConversionToBool(Value *Src, QualType DstTy);
/// Emit a check that a conversion from a floating-point type does not
/// overflow.
void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType,
Value *Src, QualType SrcType, QualType DstType,
llvm::Type *DstTy, SourceLocation Loc);
/// Known implicit conversion check kinds.
/// This is used for bitfield conversion checks as well.
/// Keep in sync with the enum of the same name in ubsan_handlers.h
enum ImplicitConversionCheckKind : unsigned char {
ICCK_IntegerTruncation = 0, // Legacy, was only used by clang 7.
ICCK_UnsignedIntegerTruncation = 1,
ICCK_SignedIntegerTruncation = 2,
ICCK_IntegerSignChange = 3,
ICCK_SignedIntegerTruncationOrSignChange = 4,
};
/// Emit a check that an [implicit] truncation of an integer does not
/// discard any bits. It is not UB, so we use the value after truncation.
void EmitIntegerTruncationCheck(Value *Src, QualType SrcType, Value *Dst,
QualType DstType, SourceLocation Loc);
/// Emit a check that an [implicit] conversion of an integer does not change
/// the sign of the value. It is not UB, so we use the value after conversion.
/// NOTE: Src and Dst may be the exact same value! (point to the same thing)
void EmitIntegerSignChangeCheck(Value *Src, QualType SrcType, Value *Dst,
QualType DstType, SourceLocation Loc);
/// Emit a conversion from the specified type to the specified destination
/// type, both of which are LLVM scalar types.
struct ScalarConversionOpts {
bool TreatBooleanAsSigned;
bool EmitImplicitIntegerTruncationChecks;
bool EmitImplicitIntegerSignChangeChecks;
ScalarConversionOpts()
: TreatBooleanAsSigned(false),
EmitImplicitIntegerTruncationChecks(false),
EmitImplicitIntegerSignChangeChecks(false) {}
ScalarConversionOpts(clang::SanitizerSet SanOpts)
: TreatBooleanAsSigned(false),
EmitImplicitIntegerTruncationChecks(
SanOpts.hasOneOf(SanitizerKind::ImplicitIntegerTruncation)),
EmitImplicitIntegerSignChangeChecks(
SanOpts.has(SanitizerKind::ImplicitIntegerSignChange)) {}
};
Value *EmitScalarCast(Value *Src, QualType SrcType, QualType DstType,
llvm::Type *SrcTy, llvm::Type *DstTy,
ScalarConversionOpts Opts);
Value *
EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy,
SourceLocation Loc,
ScalarConversionOpts Opts = ScalarConversionOpts());
/// Convert between either a fixed point and other fixed point or fixed point
/// and an integer.
Value *EmitFixedPointConversion(Value *Src, QualType SrcTy, QualType DstTy,
SourceLocation Loc);
/// Emit a conversion from the specified complex type to the specified
/// destination type, where the destination type is an LLVM scalar type.
Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
QualType SrcTy, QualType DstTy,
SourceLocation Loc);
/// EmitNullValue - Emit a value that corresponds to null for the given type.
Value *EmitNullValue(QualType Ty);
/// EmitFloatToBoolConversion - Perform an FP to boolean conversion.
Value *EmitFloatToBoolConversion(Value *V) {
// Compare against 0.0 for fp scalars.
llvm::Value *Zero = llvm::Constant::getNullValue(V->getType());
return Builder.CreateFCmpUNE(V, Zero, "tobool");
}
/// EmitPointerToBoolConversion - Perform a pointer to boolean conversion.
Value *EmitPointerToBoolConversion(Value *V, QualType QT) {
Value *Zero = CGF.CGM.getNullPointer(cast<llvm::PointerType>(V->getType()), QT);
return Builder.CreateICmpNE(V, Zero, "tobool");
}
Value *EmitIntToBoolConversion(Value *V) {
// Because of the type rules of C, we often end up computing a
// logical value, then zero extending it to int, then wanting it
// as a logical value again. Optimize this common case.
if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) {
if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) {
Value *Result = ZI->getOperand(0);
// If there aren't any more uses, zap the instruction to save space.
// Note that there can be more uses, for example if this
// is the result of an assignment.
if (ZI->use_empty())
ZI->eraseFromParent();
return Result;
}
}
return Builder.CreateIsNotNull(V, "tobool");
}
//===--------------------------------------------------------------------===//
// Visitor Methods
//===--------------------------------------------------------------------===//
Value *Visit(Expr *E) {
ApplyDebugLocation DL(CGF, E);
return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E);
}
Value *VisitStmt(Stmt *S) {
S->dump(llvm::errs(), CGF.getContext());
llvm_unreachable("Stmt can't have complex result type!");
}
Value *VisitExpr(Expr *S);
Value *VisitConstantExpr(ConstantExpr *E) {
// A constant expression of type 'void' generates no code and produces no
// value.
if (E->getType()->isVoidType())
return nullptr;
if (Value *Result = ConstantEmitter(CGF).tryEmitConstantExpr(E)) {
if (E->isGLValue())
return CGF.EmitLoadOfScalar(
Address(Result, CGF.convertTypeForLoadStore(E->getType()),
CGF.getContext().getTypeAlignInChars(E->getType())),
/*Volatile*/ false, E->getType(), E->getExprLoc());
return Result;
}
return Visit(E->getSubExpr());
}
Value *VisitParenExpr(ParenExpr *PE) {
return Visit(PE->getSubExpr());
}
Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) {
return Visit(E->getReplacement());
}
Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
return Visit(GE->getResultExpr());
}
Value *VisitCoawaitExpr(CoawaitExpr *S) {
return CGF.EmitCoawaitExpr(*S).getScalarVal();
}
Value *VisitCoyieldExpr(CoyieldExpr *S) {
return CGF.EmitCoyieldExpr(*S).getScalarVal();
}
Value *VisitUnaryCoawait(const UnaryOperator *E) {
return Visit(E->getSubExpr());
}
// Leaves.
Value *VisitIntegerLiteral(const IntegerLiteral *E) {
return Builder.getInt(E->getValue());
}
Value *VisitFixedPointLiteral(const FixedPointLiteral *E) {
return Builder.getInt(E->getValue());
}
Value *VisitFloatingLiteral(const FloatingLiteral *E) {
return llvm::ConstantFP::get(VMContext, E->getValue());
}
Value *VisitCharacterLiteral(const CharacterLiteral *E) {
return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
}
Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
}
Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
}
Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
if (E->getType()->isVoidType())
return nullptr;
return EmitNullValue(E->getType());
}
Value *VisitGNUNullExpr(const GNUNullExpr *E) {
return EmitNullValue(E->getType());
}
Value *VisitOffsetOfExpr(OffsetOfExpr *E);
Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);
Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel());
return Builder.CreateBitCast(V, ConvertType(E->getType()));
}
Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) {
return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength());
}
Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) {
return CGF.EmitPseudoObjectRValue(E).getScalarVal();
}
Value *VisitSYCLUniqueStableNameExpr(SYCLUniqueStableNameExpr *E);
Value *VisitEmbedExpr(EmbedExpr *E);
Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) {
if (E->isGLValue())
return EmitLoadOfLValue(CGF.getOrCreateOpaqueLValueMapping(E),
E->getExprLoc());
// Otherwise, assume the mapping is the scalar directly.
return CGF.getOrCreateOpaqueRValueMapping(E).getScalarVal();
}
Value *VisitOpenACCAsteriskSizeExpr(OpenACCAsteriskSizeExpr *E) {
llvm_unreachable("Codegen for this isn't defined/implemented");
}
// l-values.
Value *VisitDeclRefExpr(DeclRefExpr *E) {
if (CodeGenFunction::ConstantEmission Constant = CGF.tryEmitAsConstant(E))
return CGF.emitScalarConstant(Constant, E);
return EmitLoadOfLValue(E);
}
Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
return CGF.EmitObjCSelectorExpr(E);
}
Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
return CGF.EmitObjCProtocolExpr(E);
}
Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
return EmitLoadOfLValue(E);
}
Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
if (E->getMethodDecl() &&
E->getMethodDecl()->getReturnType()->isReferenceType())
return EmitLoadOfLValue(E);
return CGF.EmitObjCMessageExpr(E).getScalarVal();
}
Value *VisitObjCIsaExpr(ObjCIsaExpr *E) {
LValue LV = CGF.EmitObjCIsaExpr(E);
Value *V = CGF.EmitLoadOfLValue(LV, E->getExprLoc()).getScalarVal();
return V;
}
Value *VisitObjCAvailabilityCheckExpr(ObjCAvailabilityCheckExpr *E) {
VersionTuple Version = E->getVersion();
// If we're checking for a platform older than our minimum deployment
// target, we can fold the check away.
if (Version <= CGF.CGM.getTarget().getPlatformMinVersion())
return llvm::ConstantInt::get(Builder.getInt1Ty(), 1);
return CGF.EmitBuiltinAvailable(Version);
}
Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
Value *VisitMatrixSubscriptExpr(MatrixSubscriptExpr *E);
Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
Value *VisitConvertVectorExpr(ConvertVectorExpr *E);
Value *VisitMemberExpr(MemberExpr *E);
Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
// Strictly speaking, we shouldn't be calling EmitLoadOfLValue, which
// transitively calls EmitCompoundLiteralLValue, here in C++ since compound
// literals aren't l-values in C++. We do so simply because that's the
// cleanest way to handle compound literals in C++.
// See the discussion here: https://reviews.llvm.org/D64464
return EmitLoadOfLValue(E);
}
Value *VisitInitListExpr(InitListExpr *E);
Value *VisitArrayInitIndexExpr(ArrayInitIndexExpr *E) {
assert(CGF.getArrayInitIndex() &&
"ArrayInitIndexExpr not inside an ArrayInitLoopExpr?");
return CGF.getArrayInitIndex();
}
Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
return EmitNullValue(E->getType());
}
Value *VisitExplicitCastExpr(ExplicitCastExpr *E) {
CGF.CGM.EmitExplicitCastExprType(E, &CGF);
return VisitCastExpr(E);
}
Value *VisitCastExpr(CastExpr *E);
Value *VisitCallExpr(const CallExpr *E) {
if (E->getCallReturnType(CGF.getContext())->isReferenceType())
return EmitLoadOfLValue(E);
Value *V = CGF.EmitCallExpr(E).getScalarVal();
EmitLValueAlignmentAssumption(E, V);
return V;
}
Value *VisitStmtExpr(const StmtExpr *E);
// Unary Operators.
Value *VisitUnaryPostDec(const UnaryOperator *E) {
LValue LV = EmitLValue(E->getSubExpr());
return EmitScalarPrePostIncDec(E, LV, false, false);
}
Value *VisitUnaryPostInc(const UnaryOperator *E) {
LValue LV = EmitLValue(E->getSubExpr());
return EmitScalarPrePostIncDec(E, LV, true, false);
}
Value *VisitUnaryPreDec(const UnaryOperator *E) {
LValue LV = EmitLValue(E->getSubExpr());
return EmitScalarPrePostIncDec(E, LV, false, true);
}
Value *VisitUnaryPreInc(const UnaryOperator *E) {
LValue LV = EmitLValue(E->getSubExpr());
return EmitScalarPrePostIncDec(E, LV, true, true);
}
llvm::Value *EmitIncDecConsiderOverflowBehavior(const UnaryOperator *E,
llvm::Value *InVal,
bool IsInc);
llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
bool isInc, bool isPre);
Value *VisitUnaryAddrOf(const UnaryOperator *E) {
if (isa<MemberPointerType>(E->getType())) // never sugared
return CGF.CGM.getMemberPointerConstant(E);
return EmitLValue(E->getSubExpr()).getPointer(CGF);
}
Value *VisitUnaryDeref(const UnaryOperator *E) {
if (E->getType()->isVoidType())
return Visit(E->getSubExpr()); // the actual value should be unused
return EmitLoadOfLValue(E);
}
Value *VisitUnaryPlus(const UnaryOperator *E,
QualType PromotionType = QualType());
Value *VisitPlus(const UnaryOperator *E, QualType PromotionType);
Value *VisitUnaryMinus(const UnaryOperator *E,
QualType PromotionType = QualType());
Value *VisitMinus(const UnaryOperator *E, QualType PromotionType);
Value *VisitUnaryNot (const UnaryOperator *E);
Value *VisitUnaryLNot (const UnaryOperator *E);
Value *VisitUnaryReal(const UnaryOperator *E,
QualType PromotionType = QualType());
Value *VisitReal(const UnaryOperator *E, QualType PromotionType);
Value *VisitUnaryImag(const UnaryOperator *E,
QualType PromotionType = QualType());
Value *VisitImag(const UnaryOperator *E, QualType PromotionType);
Value *VisitUnaryExtension(const UnaryOperator *E) {
return Visit(E->getSubExpr());
}
// C++
Value *VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E) {
return EmitLoadOfLValue(E);
}
Value *VisitSourceLocExpr(SourceLocExpr *SLE) {
auto &Ctx = CGF.getContext();
APValue Evaluated =
SLE->EvaluateInContext(Ctx, CGF.CurSourceLocExprScope.getDefaultExpr());
return ConstantEmitter(CGF).emitAbstract(SLE->getLocation(), Evaluated,
SLE->getType());
}
Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
CodeGenFunction::CXXDefaultArgExprScope Scope(CGF, DAE);
return Visit(DAE->getExpr());
}
Value *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) {
CodeGenFunction::CXXDefaultInitExprScope Scope(CGF, DIE);
return Visit(DIE->getExpr());
}
Value *VisitCXXThisExpr(CXXThisExpr *TE) {
return CGF.LoadCXXThis();
}
Value *VisitExprWithCleanups(ExprWithCleanups *E);
Value *VisitCXXNewExpr(const CXXNewExpr *E) {
return CGF.EmitCXXNewExpr(E);
}
Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) {
CGF.EmitCXXDeleteExpr(E);
return nullptr;
}
Value *VisitTypeTraitExpr(const TypeTraitExpr *E) {
return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
}
Value *VisitConceptSpecializationExpr(const ConceptSpecializationExpr *E) {
return Builder.getInt1(E->isSatisfied());
}
Value *VisitRequiresExpr(const RequiresExpr *E) {
return Builder.getInt1(E->isSatisfied());
}
Value *VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) {
return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
}
Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue());
}
Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) {
// C++ [expr.pseudo]p1:
// The result shall only be used as the operand for the function call
// operator (), and the result of such a call has type void. The only
// effect is the evaluation of the postfix-expression before the dot or
// arrow.
CGF.EmitScalarExpr(E->getBase());
return nullptr;
}
Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) {
return EmitNullValue(E->getType());
}
Value *VisitCXXThrowExpr(const CXXThrowExpr *E) {
CGF.EmitCXXThrowExpr(E);
return nullptr;
}
Value *VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
return Builder.getInt1(E->getValue());
}
// Binary Operators.
Value *EmitMul(const BinOpInfo &Ops) {
if (Ops.Ty->isSignedIntegerOrEnumerationType()) {
switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
case LangOptions::SOB_Defined:
if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
[[fallthrough]];
case LangOptions::SOB_Undefined:
if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow))
return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul");
[[fallthrough]];
case LangOptions::SOB_Trapping:
if (CanElideOverflowCheck(CGF.getContext(), Ops))
return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul");
return EmitOverflowCheckedBinOp(Ops);
}
}
if (Ops.Ty->isConstantMatrixType()) {
llvm::MatrixBuilder MB(Builder);
// We need to check the types of the operands of the operator to get the
// correct matrix dimensions.
auto *BO = cast<BinaryOperator>(Ops.E);
auto *LHSMatTy = dyn_cast<ConstantMatrixType>(
BO->getLHS()->getType().getCanonicalType());
auto *RHSMatTy = dyn_cast<ConstantMatrixType>(
BO->getRHS()->getType().getCanonicalType());
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Ops.FPFeatures);
if (LHSMatTy && RHSMatTy)
return MB.CreateMatrixMultiply(Ops.LHS, Ops.RHS, LHSMatTy->getNumRows(),
LHSMatTy->getNumColumns(),
RHSMatTy->getNumColumns());
return MB.CreateScalarMultiply(Ops.LHS, Ops.RHS);
}
if (Ops.Ty->isUnsignedIntegerType() &&
CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow) &&
!CanElideOverflowCheck(CGF.getContext(), Ops))
return EmitOverflowCheckedBinOp(Ops);
if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
// Preserve the old values
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Ops.FPFeatures);
return Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul");
}
if (Ops.isFixedPointOp())
return EmitFixedPointBinOp(Ops);
return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
}
/// Create a binary op that checks for overflow.
/// Currently only supports +, - and *.
Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops);
// Check for undefined division and modulus behaviors.
void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops,
llvm::Value *Zero,bool isDiv);
// Common helper for getting how wide LHS of shift is.
static Value *GetMaximumShiftAmount(Value *LHS, Value *RHS, bool RHSIsSigned);
// Used for shifting constraints for OpenCL, do mask for powers of 2, URem for
// non powers of two.
Value *ConstrainShiftValue(Value *LHS, Value *RHS, const Twine &Name);
Value *EmitDiv(const BinOpInfo &Ops);
Value *EmitRem(const BinOpInfo &Ops);
Value *EmitAdd(const BinOpInfo &Ops);
Value *EmitSub(const BinOpInfo &Ops);
Value *EmitShl(const BinOpInfo &Ops);
Value *EmitShr(const BinOpInfo &Ops);
Value *EmitAnd(const BinOpInfo &Ops) {
return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and");
}
Value *EmitXor(const BinOpInfo &Ops) {
return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor");
}
Value *EmitOr (const BinOpInfo &Ops) {
return Builder.CreateOr(Ops.LHS, Ops.RHS, "or");
}
// Helper functions for fixed point binary operations.
Value *EmitFixedPointBinOp(const BinOpInfo &Ops);
BinOpInfo EmitBinOps(const BinaryOperator *E,
QualType PromotionTy = QualType());
Value *EmitPromotedValue(Value *result, QualType PromotionType);
Value *EmitUnPromotedValue(Value *result, QualType ExprType);
Value *EmitPromoted(const Expr *E, QualType PromotionType);
LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
Value *(ScalarExprEmitter::*F)(const BinOpInfo &),
Value *&Result);
Value *EmitCompoundAssign(const CompoundAssignOperator *E,
Value *(ScalarExprEmitter::*F)(const BinOpInfo &));
QualType getPromotionType(QualType Ty) {
const auto &Ctx = CGF.getContext();
if (auto *CT = Ty->getAs<ComplexType>()) {
QualType ElementType = CT->getElementType();
if (ElementType.UseExcessPrecision(Ctx))
return Ctx.getComplexType(Ctx.FloatTy);
}
if (Ty.UseExcessPrecision(Ctx)) {
if (auto *VT = Ty->getAs<VectorType>()) {
unsigned NumElements = VT->getNumElements();
return Ctx.getVectorType(Ctx.FloatTy, NumElements, VT->getVectorKind());
}
return Ctx.FloatTy;
}
return QualType();
}
// Binary operators and binary compound assignment operators.
#define HANDLEBINOP(OP) \
Value *VisitBin##OP(const BinaryOperator *E) { \
QualType promotionTy = getPromotionType(E->getType()); \
auto result = Emit##OP(EmitBinOps(E, promotionTy)); \
if (result && !promotionTy.isNull()) \
result = EmitUnPromotedValue(result, E->getType()); \
return result; \
} \
Value *VisitBin##OP##Assign(const CompoundAssignOperator *E) { \
return EmitCompoundAssign(E, &ScalarExprEmitter::Emit##OP); \
}
HANDLEBINOP(Mul)
HANDLEBINOP(Div)
HANDLEBINOP(Rem)
HANDLEBINOP(Add)
HANDLEBINOP(Sub)
HANDLEBINOP(Shl)
HANDLEBINOP(Shr)
HANDLEBINOP(And)
HANDLEBINOP(Xor)
HANDLEBINOP(Or)
#undef HANDLEBINOP
// Comparisons.
Value *EmitCompare(const BinaryOperator *E, llvm::CmpInst::Predicate UICmpOpc,
llvm::CmpInst::Predicate SICmpOpc,
llvm::CmpInst::Predicate FCmpOpc, bool IsSignaling);
#define VISITCOMP(CODE, UI, SI, FP, SIG) \
Value *VisitBin##CODE(const BinaryOperator *E) { \
return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \
llvm::FCmpInst::FP, SIG); }
VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT, true)
VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT, true)
VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE, true)
VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE, true)
VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ, false)
VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE, false)
#undef VISITCOMP
Value *VisitBinAssign (const BinaryOperator *E);
Value *VisitBinLAnd (const BinaryOperator *E);
Value *VisitBinLOr (const BinaryOperator *E);
Value *VisitBinComma (const BinaryOperator *E);
Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); }
Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); }
Value *VisitCXXRewrittenBinaryOperator(CXXRewrittenBinaryOperator *E) {
return Visit(E->getSemanticForm());
}
// Other Operators.
Value *VisitBlockExpr(const BlockExpr *BE);
Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *);
Value *VisitChooseExpr(ChooseExpr *CE);
Value *VisitVAArgExpr(VAArgExpr *VE);
Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
return CGF.EmitObjCStringLiteral(E);
}
Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) {
return CGF.EmitObjCBoxedExpr(E);
}
Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) {
return CGF.EmitObjCArrayLiteral(E);
}
Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) {
return CGF.EmitObjCDictionaryLiteral(E);
}
Value *VisitAsTypeExpr(AsTypeExpr *CE);
Value *VisitAtomicExpr(AtomicExpr *AE);
Value *VisitPackIndexingExpr(PackIndexingExpr *E) {
return Visit(E->getSelectedExpr());
}
};
} // end anonymous namespace.
//===----------------------------------------------------------------------===//
// Utilities
//===----------------------------------------------------------------------===//
/// EmitConversionToBool - Convert the specified expression value to a
/// boolean (i1) truth value. This is equivalent to "Val != 0".
Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) {
assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs");
if (SrcType->isRealFloatingType())
return EmitFloatToBoolConversion(Src);
if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType))
return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT);
assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&
"Unknown scalar type to convert");
if (isa<llvm::IntegerType>(Src->getType()))
return EmitIntToBoolConversion(Src);
assert(isa<llvm::PointerType>(Src->getType()));
return EmitPointerToBoolConversion(Src, SrcType);
}
void ScalarExprEmitter::EmitFloatConversionCheck(
Value *OrigSrc, QualType OrigSrcType, Value *Src, QualType SrcType,
QualType DstType, llvm::Type *DstTy, SourceLocation Loc) {
assert(SrcType->isFloatingType() && "not a conversion from floating point");
if (!isa<llvm::IntegerType>(DstTy))
return;
CodeGenFunction::SanitizerScope SanScope(&CGF);
using llvm::APFloat;
using llvm::APSInt;
llvm::Value *Check = nullptr;
const llvm::fltSemantics &SrcSema =
CGF.getContext().getFloatTypeSemantics(OrigSrcType);