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CGStmtOpenMP.cpp
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//===--- CGStmtOpenMP.cpp - Emit LLVM Code from Statements ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This contains code to emit OpenMP nodes as LLVM code.
//
//===----------------------------------------------------------------------===//
#include "CGCleanup.h"
#include "CGOpenMPRuntime.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "TargetInfo.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtOpenMP.h"
#include "clang/AST/DeclOpenMP.h"
#include "llvm/IR/CallSite.h"
using namespace clang;
using namespace CodeGen;
namespace {
/// Lexical scope for OpenMP executable constructs, that handles correct codegen
/// for captured expressions.
class OMPLexicalScope final : public CodeGenFunction::LexicalScope {
void emitPreInitStmt(CodeGenFunction &CGF, const OMPExecutableDirective &S) {
for (const auto *C : S.clauses()) {
if (auto *CPI = OMPClauseWithPreInit::get(C)) {
if (auto *PreInit = cast_or_null<DeclStmt>(CPI->getPreInitStmt())) {
for (const auto *I : PreInit->decls()) {
if (!I->hasAttr<OMPCaptureNoInitAttr>())
CGF.EmitVarDecl(cast<VarDecl>(*I));
else {
CodeGenFunction::AutoVarEmission Emission =
CGF.EmitAutoVarAlloca(cast<VarDecl>(*I));
CGF.EmitAutoVarCleanups(Emission);
}
}
}
}
}
}
CodeGenFunction::OMPPrivateScope InlinedShareds;
static bool isCapturedVar(CodeGenFunction &CGF, const VarDecl *VD) {
return CGF.LambdaCaptureFields.lookup(VD) ||
(CGF.CapturedStmtInfo && CGF.CapturedStmtInfo->lookup(VD)) ||
(CGF.CurCodeDecl && isa<BlockDecl>(CGF.CurCodeDecl));
}
public:
OMPLexicalScope(CodeGenFunction &CGF, const OMPExecutableDirective &S,
bool AsInlined = false)
: CodeGenFunction::LexicalScope(CGF, S.getSourceRange()),
InlinedShareds(CGF) {
emitPreInitStmt(CGF, S);
if (AsInlined) {
if (S.hasAssociatedStmt()) {
auto *CS = cast<CapturedStmt>(S.getAssociatedStmt());
for (auto &C : CS->captures()) {
if (C.capturesVariable() || C.capturesVariableByCopy()) {
auto *VD = C.getCapturedVar();
DeclRefExpr DRE(const_cast<VarDecl *>(VD),
isCapturedVar(CGF, VD) ||
(CGF.CapturedStmtInfo &&
InlinedShareds.isGlobalVarCaptured(VD)),
VD->getType().getNonReferenceType(), VK_LValue,
SourceLocation());
InlinedShareds.addPrivate(VD, [&CGF, &DRE]() -> Address {
return CGF.EmitLValue(&DRE).getAddress();
});
}
}
(void)InlinedShareds.Privatize();
}
}
}
};
/// Private scope for OpenMP loop-based directives, that supports capturing
/// of used expression from loop statement.
class OMPLoopScope : public CodeGenFunction::RunCleanupsScope {
void emitPreInitStmt(CodeGenFunction &CGF, const OMPLoopDirective &S) {
if (auto *LD = dyn_cast<OMPLoopDirective>(&S)) {
if (auto *PreInits = cast_or_null<DeclStmt>(LD->getPreInits())) {
for (const auto *I : PreInits->decls())
CGF.EmitVarDecl(cast<VarDecl>(*I));
}
}
}
public:
OMPLoopScope(CodeGenFunction &CGF, const OMPLoopDirective &S)
: CodeGenFunction::RunCleanupsScope(CGF) {
emitPreInitStmt(CGF, S);
}
};
} // namespace
llvm::Value *CodeGenFunction::getTypeSize(QualType Ty) {
auto &C = getContext();
llvm::Value *Size = nullptr;
auto SizeInChars = C.getTypeSizeInChars(Ty);
if (SizeInChars.isZero()) {
// getTypeSizeInChars() returns 0 for a VLA.
while (auto *VAT = C.getAsVariableArrayType(Ty)) {
llvm::Value *ArraySize;
std::tie(ArraySize, Ty) = getVLASize(VAT);
Size = Size ? Builder.CreateNUWMul(Size, ArraySize) : ArraySize;
}
SizeInChars = C.getTypeSizeInChars(Ty);
if (SizeInChars.isZero())
return llvm::ConstantInt::get(SizeTy, /*V=*/0);
Size = Builder.CreateNUWMul(Size, CGM.getSize(SizeInChars));
} else
Size = CGM.getSize(SizeInChars);
return Size;
}
void CodeGenFunction::GenerateOpenMPCapturedVars(
const CapturedStmt &S, SmallVectorImpl<llvm::Value *> &CapturedVars) {
const RecordDecl *RD = S.getCapturedRecordDecl();
auto CurField = RD->field_begin();
auto CurCap = S.captures().begin();
for (CapturedStmt::const_capture_init_iterator I = S.capture_init_begin(),
E = S.capture_init_end();
I != E; ++I, ++CurField, ++CurCap) {
if (CurField->hasCapturedVLAType()) {
auto VAT = CurField->getCapturedVLAType();
auto *Val = VLASizeMap[VAT->getSizeExpr()];
CapturedVars.push_back(Val);
} else if (CurCap->capturesThis())
CapturedVars.push_back(CXXThisValue);
else if (CurCap->capturesVariableByCopy()) {
llvm::Value *CV =
EmitLoadOfLValue(EmitLValue(*I), SourceLocation()).getScalarVal();
// If the field is not a pointer, we need to save the actual value
// and load it as a void pointer.
if (!CurField->getType()->isAnyPointerType()) {
auto &Ctx = getContext();
auto DstAddr = CreateMemTemp(
Ctx.getUIntPtrType(),
Twine(CurCap->getCapturedVar()->getName()) + ".casted");
LValue DstLV = MakeAddrLValue(DstAddr, Ctx.getUIntPtrType());
auto *SrcAddrVal = EmitScalarConversion(
DstAddr.getPointer(), Ctx.getPointerType(Ctx.getUIntPtrType()),
Ctx.getPointerType(CurField->getType()), SourceLocation());
LValue SrcLV =
MakeNaturalAlignAddrLValue(SrcAddrVal, CurField->getType());
// Store the value using the source type pointer.
EmitStoreThroughLValue(RValue::get(CV), SrcLV);
// Load the value using the destination type pointer.
CV = EmitLoadOfLValue(DstLV, SourceLocation()).getScalarVal();
}
CapturedVars.push_back(CV);
} else {
assert(CurCap->capturesVariable() && "Expected capture by reference.");
CapturedVars.push_back(EmitLValue(*I).getAddress().getPointer());
}
}
}
static Address castValueFromUintptr(CodeGenFunction &CGF, QualType DstType,
StringRef Name, LValue AddrLV,
bool isReferenceType = false) {
ASTContext &Ctx = CGF.getContext();
auto *CastedPtr = CGF.EmitScalarConversion(
AddrLV.getAddress().getPointer(), Ctx.getUIntPtrType(),
Ctx.getPointerType(DstType), SourceLocation());
auto TmpAddr =
CGF.MakeNaturalAlignAddrLValue(CastedPtr, Ctx.getPointerType(DstType))
.getAddress();
// If we are dealing with references we need to return the address of the
// reference instead of the reference of the value.
if (isReferenceType) {
QualType RefType = Ctx.getLValueReferenceType(DstType);
auto *RefVal = TmpAddr.getPointer();
TmpAddr = CGF.CreateMemTemp(RefType, Twine(Name) + ".ref");
auto TmpLVal = CGF.MakeAddrLValue(TmpAddr, RefType);
CGF.EmitStoreThroughLValue(RValue::get(RefVal), TmpLVal, /*isInit*/ true);
}
return TmpAddr;
}
llvm::Function *
CodeGenFunction::GenerateOpenMPCapturedStmtFunction(const CapturedStmt &S) {
assert(
CapturedStmtInfo &&
"CapturedStmtInfo should be set when generating the captured function");
const CapturedDecl *CD = S.getCapturedDecl();
const RecordDecl *RD = S.getCapturedRecordDecl();
assert(CD->hasBody() && "missing CapturedDecl body");
// Build the argument list.
ASTContext &Ctx = CGM.getContext();
FunctionArgList Args;
Args.append(CD->param_begin(),
std::next(CD->param_begin(), CD->getContextParamPosition()));
auto I = S.captures().begin();
for (auto *FD : RD->fields()) {
QualType ArgType = FD->getType();
IdentifierInfo *II = nullptr;
VarDecl *CapVar = nullptr;
// If this is a capture by copy and the type is not a pointer, the outlined
// function argument type should be uintptr and the value properly casted to
// uintptr. This is necessary given that the runtime library is only able to
// deal with pointers. We can pass in the same way the VLA type sizes to the
// outlined function.
if ((I->capturesVariableByCopy() && !ArgType->isAnyPointerType()) ||
I->capturesVariableArrayType())
ArgType = Ctx.getUIntPtrType();
if (I->capturesVariable() || I->capturesVariableByCopy()) {
CapVar = I->getCapturedVar();
II = CapVar->getIdentifier();
} else if (I->capturesThis())
II = &getContext().Idents.get("this");
else {
assert(I->capturesVariableArrayType());
II = &getContext().Idents.get("vla");
}
if (ArgType->isVariablyModifiedType()) {
bool IsReference = ArgType->isLValueReferenceType();
ArgType =
getContext().getCanonicalParamType(ArgType.getNonReferenceType());
if (IsReference && !ArgType->isPointerType()) {
ArgType = getContext().getLValueReferenceType(
ArgType, /*SpelledAsLValue=*/false);
}
}
Args.push_back(ImplicitParamDecl::Create(getContext(), nullptr,
FD->getLocation(), II, ArgType));
++I;
}
Args.append(
std::next(CD->param_begin(), CD->getContextParamPosition() + 1),
CD->param_end());
// Create the function declaration.
FunctionType::ExtInfo ExtInfo;
const CGFunctionInfo &FuncInfo =
CGM.getTypes().arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Args);
llvm::FunctionType *FuncLLVMTy = CGM.getTypes().GetFunctionType(FuncInfo);
llvm::Function *F = llvm::Function::Create(
FuncLLVMTy, llvm::GlobalValue::InternalLinkage,
CapturedStmtInfo->getHelperName(), &CGM.getModule());
CGM.SetInternalFunctionAttributes(CD, F, FuncInfo);
if (CD->isNothrow())
F->addFnAttr(llvm::Attribute::NoUnwind);
// Generate the function.
StartFunction(CD, Ctx.VoidTy, F, FuncInfo, Args, CD->getLocation(),
CD->getBody()->getLocStart());
unsigned Cnt = CD->getContextParamPosition();
I = S.captures().begin();
for (auto *FD : RD->fields()) {
// If we are capturing a pointer by copy we don't need to do anything, just
// use the value that we get from the arguments.
if (I->capturesVariableByCopy() && FD->getType()->isAnyPointerType()) {
const VarDecl *CurVD = I->getCapturedVar();
Address LocalAddr = GetAddrOfLocalVar(Args[Cnt]);
// If the variable is a reference we need to materialize it here.
if (CurVD->getType()->isReferenceType()) {
Address RefAddr = CreateMemTemp(CurVD->getType(), getPointerAlign(),
".materialized_ref");
EmitStoreOfScalar(LocalAddr.getPointer(), RefAddr, /*Volatile=*/false,
CurVD->getType());
LocalAddr = RefAddr;
}
setAddrOfLocalVar(CurVD, LocalAddr);
++Cnt;
++I;
continue;
}
LValue ArgLVal =
MakeAddrLValue(GetAddrOfLocalVar(Args[Cnt]), Args[Cnt]->getType(),
AlignmentSource::Decl);
if (FD->hasCapturedVLAType()) {
LValue CastedArgLVal =
MakeAddrLValue(castValueFromUintptr(*this, FD->getType(),
Args[Cnt]->getName(), ArgLVal),
FD->getType(), AlignmentSource::Decl);
auto *ExprArg =
EmitLoadOfLValue(CastedArgLVal, SourceLocation()).getScalarVal();
auto VAT = FD->getCapturedVLAType();
VLASizeMap[VAT->getSizeExpr()] = ExprArg;
} else if (I->capturesVariable()) {
auto *Var = I->getCapturedVar();
QualType VarTy = Var->getType();
Address ArgAddr = ArgLVal.getAddress();
if (!VarTy->isReferenceType()) {
if (ArgLVal.getType()->isLValueReferenceType()) {
ArgAddr = EmitLoadOfReference(
ArgAddr, ArgLVal.getType()->castAs<ReferenceType>());
} else if (!VarTy->isVariablyModifiedType() || !VarTy->isPointerType()) {
assert(ArgLVal.getType()->isPointerType());
ArgAddr = EmitLoadOfPointer(
ArgAddr, ArgLVal.getType()->castAs<PointerType>());
}
}
setAddrOfLocalVar(
Var, Address(ArgAddr.getPointer(), getContext().getDeclAlign(Var)));
} else if (I->capturesVariableByCopy()) {
assert(!FD->getType()->isAnyPointerType() &&
"Not expecting a captured pointer.");
auto *Var = I->getCapturedVar();
QualType VarTy = Var->getType();
setAddrOfLocalVar(Var, castValueFromUintptr(*this, FD->getType(),
Args[Cnt]->getName(), ArgLVal,
VarTy->isReferenceType()));
} else {
// If 'this' is captured, load it into CXXThisValue.
assert(I->capturesThis());
CXXThisValue =
EmitLoadOfLValue(ArgLVal, Args[Cnt]->getLocation()).getScalarVal();
}
++Cnt;
++I;
}
PGO.assignRegionCounters(GlobalDecl(CD), F);
CapturedStmtInfo->EmitBody(*this, CD->getBody());
FinishFunction(CD->getBodyRBrace());
return F;
}
//===----------------------------------------------------------------------===//
// OpenMP Directive Emission
//===----------------------------------------------------------------------===//
void CodeGenFunction::EmitOMPAggregateAssign(
Address DestAddr, Address SrcAddr, QualType OriginalType,
const llvm::function_ref<void(Address, Address)> &CopyGen) {
// Perform element-by-element initialization.
QualType ElementTy;
// Drill down to the base element type on both arrays.
auto ArrayTy = OriginalType->getAsArrayTypeUnsafe();
auto NumElements = emitArrayLength(ArrayTy, ElementTy, DestAddr);
SrcAddr = Builder.CreateElementBitCast(SrcAddr, DestAddr.getElementType());
auto SrcBegin = SrcAddr.getPointer();
auto DestBegin = DestAddr.getPointer();
// Cast from pointer to array type to pointer to single element.
auto DestEnd = Builder.CreateGEP(DestBegin, NumElements);
// The basic structure here is a while-do loop.
auto BodyBB = createBasicBlock("omp.arraycpy.body");
auto DoneBB = createBasicBlock("omp.arraycpy.done");
auto IsEmpty =
Builder.CreateICmpEQ(DestBegin, DestEnd, "omp.arraycpy.isempty");
Builder.CreateCondBr(IsEmpty, DoneBB, BodyBB);
// Enter the loop body, making that address the current address.
auto EntryBB = Builder.GetInsertBlock();
EmitBlock(BodyBB);
CharUnits ElementSize = getContext().getTypeSizeInChars(ElementTy);
llvm::PHINode *SrcElementPHI =
Builder.CreatePHI(SrcBegin->getType(), 2, "omp.arraycpy.srcElementPast");
SrcElementPHI->addIncoming(SrcBegin, EntryBB);
Address SrcElementCurrent =
Address(SrcElementPHI,
SrcAddr.getAlignment().alignmentOfArrayElement(ElementSize));
llvm::PHINode *DestElementPHI =
Builder.CreatePHI(DestBegin->getType(), 2, "omp.arraycpy.destElementPast");
DestElementPHI->addIncoming(DestBegin, EntryBB);
Address DestElementCurrent =
Address(DestElementPHI,
DestAddr.getAlignment().alignmentOfArrayElement(ElementSize));
// Emit copy.
CopyGen(DestElementCurrent, SrcElementCurrent);
// Shift the address forward by one element.
auto DestElementNext = Builder.CreateConstGEP1_32(
DestElementPHI, /*Idx0=*/1, "omp.arraycpy.dest.element");
auto SrcElementNext = Builder.CreateConstGEP1_32(
SrcElementPHI, /*Idx0=*/1, "omp.arraycpy.src.element");
// Check whether we've reached the end.
auto Done =
Builder.CreateICmpEQ(DestElementNext, DestEnd, "omp.arraycpy.done");
Builder.CreateCondBr(Done, DoneBB, BodyBB);
DestElementPHI->addIncoming(DestElementNext, Builder.GetInsertBlock());
SrcElementPHI->addIncoming(SrcElementNext, Builder.GetInsertBlock());
// Done.
EmitBlock(DoneBB, /*IsFinished=*/true);
}
/// Check if the combiner is a call to UDR combiner and if it is so return the
/// UDR decl used for reduction.
static const OMPDeclareReductionDecl *
getReductionInit(const Expr *ReductionOp) {
if (auto *CE = dyn_cast<CallExpr>(ReductionOp))
if (auto *OVE = dyn_cast<OpaqueValueExpr>(CE->getCallee()))
if (auto *DRE =
dyn_cast<DeclRefExpr>(OVE->getSourceExpr()->IgnoreImpCasts()))
if (auto *DRD = dyn_cast<OMPDeclareReductionDecl>(DRE->getDecl()))
return DRD;
return nullptr;
}
static void emitInitWithReductionInitializer(CodeGenFunction &CGF,
const OMPDeclareReductionDecl *DRD,
const Expr *InitOp,
Address Private, Address Original,
QualType Ty) {
if (DRD->getInitializer()) {
std::pair<llvm::Function *, llvm::Function *> Reduction =
CGF.CGM.getOpenMPRuntime().getUserDefinedReduction(DRD);
auto *CE = cast<CallExpr>(InitOp);
auto *OVE = cast<OpaqueValueExpr>(CE->getCallee());
const Expr *LHS = CE->getArg(/*Arg=*/0)->IgnoreParenImpCasts();
const Expr *RHS = CE->getArg(/*Arg=*/1)->IgnoreParenImpCasts();
auto *LHSDRE = cast<DeclRefExpr>(cast<UnaryOperator>(LHS)->getSubExpr());
auto *RHSDRE = cast<DeclRefExpr>(cast<UnaryOperator>(RHS)->getSubExpr());
CodeGenFunction::OMPPrivateScope PrivateScope(CGF);
PrivateScope.addPrivate(cast<VarDecl>(LHSDRE->getDecl()),
[=]() -> Address { return Private; });
PrivateScope.addPrivate(cast<VarDecl>(RHSDRE->getDecl()),
[=]() -> Address { return Original; });
(void)PrivateScope.Privatize();
RValue Func = RValue::get(Reduction.second);
CodeGenFunction::OpaqueValueMapping Map(CGF, OVE, Func);
CGF.EmitIgnoredExpr(InitOp);
} else {
llvm::Constant *Init = CGF.CGM.EmitNullConstant(Ty);
auto *GV = new llvm::GlobalVariable(
CGF.CGM.getModule(), Init->getType(), /*isConstant=*/true,
llvm::GlobalValue::PrivateLinkage, Init, ".init");
LValue LV = CGF.MakeNaturalAlignAddrLValue(GV, Ty);
RValue InitRVal;
switch (CGF.getEvaluationKind(Ty)) {
case TEK_Scalar:
InitRVal = CGF.EmitLoadOfLValue(LV, SourceLocation());
break;
case TEK_Complex:
InitRVal =
RValue::getComplex(CGF.EmitLoadOfComplex(LV, SourceLocation()));
break;
case TEK_Aggregate:
InitRVal = RValue::getAggregate(LV.getAddress());
break;
}
OpaqueValueExpr OVE(SourceLocation(), Ty, VK_RValue);
CodeGenFunction::OpaqueValueMapping OpaqueMap(CGF, &OVE, InitRVal);
CGF.EmitAnyExprToMem(&OVE, Private, Ty.getQualifiers(),
/*IsInitializer=*/false);
}
}
/// \brief Emit initialization of arrays of complex types.
/// \param DestAddr Address of the array.
/// \param Type Type of array.
/// \param Init Initial expression of array.
/// \param SrcAddr Address of the original array.
static void EmitOMPAggregateInit(CodeGenFunction &CGF, Address DestAddr,
QualType Type, const Expr *Init,
Address SrcAddr = Address::invalid()) {
auto *DRD = getReductionInit(Init);
// Perform element-by-element initialization.
QualType ElementTy;
// Drill down to the base element type on both arrays.
auto ArrayTy = Type->getAsArrayTypeUnsafe();
auto NumElements = CGF.emitArrayLength(ArrayTy, ElementTy, DestAddr);
DestAddr =
CGF.Builder.CreateElementBitCast(DestAddr, DestAddr.getElementType());
if (DRD)
SrcAddr =
CGF.Builder.CreateElementBitCast(SrcAddr, DestAddr.getElementType());
llvm::Value *SrcBegin = nullptr;
if (DRD)
SrcBegin = SrcAddr.getPointer();
auto DestBegin = DestAddr.getPointer();
// Cast from pointer to array type to pointer to single element.
auto DestEnd = CGF.Builder.CreateGEP(DestBegin, NumElements);
// The basic structure here is a while-do loop.
auto BodyBB = CGF.createBasicBlock("omp.arrayinit.body");
auto DoneBB = CGF.createBasicBlock("omp.arrayinit.done");
auto IsEmpty =
CGF.Builder.CreateICmpEQ(DestBegin, DestEnd, "omp.arrayinit.isempty");
CGF.Builder.CreateCondBr(IsEmpty, DoneBB, BodyBB);
// Enter the loop body, making that address the current address.
auto EntryBB = CGF.Builder.GetInsertBlock();
CGF.EmitBlock(BodyBB);
CharUnits ElementSize = CGF.getContext().getTypeSizeInChars(ElementTy);
llvm::PHINode *SrcElementPHI = nullptr;
Address SrcElementCurrent = Address::invalid();
if (DRD) {
SrcElementPHI = CGF.Builder.CreatePHI(SrcBegin->getType(), 2,
"omp.arraycpy.srcElementPast");
SrcElementPHI->addIncoming(SrcBegin, EntryBB);
SrcElementCurrent =
Address(SrcElementPHI,
SrcAddr.getAlignment().alignmentOfArrayElement(ElementSize));
}
llvm::PHINode *DestElementPHI = CGF.Builder.CreatePHI(
DestBegin->getType(), 2, "omp.arraycpy.destElementPast");
DestElementPHI->addIncoming(DestBegin, EntryBB);
Address DestElementCurrent =
Address(DestElementPHI,
DestAddr.getAlignment().alignmentOfArrayElement(ElementSize));
// Emit copy.
{
CodeGenFunction::RunCleanupsScope InitScope(CGF);
if (DRD && (DRD->getInitializer() || !Init)) {
emitInitWithReductionInitializer(CGF, DRD, Init, DestElementCurrent,
SrcElementCurrent, ElementTy);
} else
CGF.EmitAnyExprToMem(Init, DestElementCurrent, ElementTy.getQualifiers(),
/*IsInitializer=*/false);
}
if (DRD) {
// Shift the address forward by one element.
auto SrcElementNext = CGF.Builder.CreateConstGEP1_32(
SrcElementPHI, /*Idx0=*/1, "omp.arraycpy.dest.element");
SrcElementPHI->addIncoming(SrcElementNext, CGF.Builder.GetInsertBlock());
}
// Shift the address forward by one element.
auto DestElementNext = CGF.Builder.CreateConstGEP1_32(
DestElementPHI, /*Idx0=*/1, "omp.arraycpy.dest.element");
// Check whether we've reached the end.
auto Done =
CGF.Builder.CreateICmpEQ(DestElementNext, DestEnd, "omp.arraycpy.done");
CGF.Builder.CreateCondBr(Done, DoneBB, BodyBB);
DestElementPHI->addIncoming(DestElementNext, CGF.Builder.GetInsertBlock());
// Done.
CGF.EmitBlock(DoneBB, /*IsFinished=*/true);
}
void CodeGenFunction::EmitOMPCopy(QualType OriginalType, Address DestAddr,
Address SrcAddr, const VarDecl *DestVD,
const VarDecl *SrcVD, const Expr *Copy) {
if (OriginalType->isArrayType()) {
auto *BO = dyn_cast<BinaryOperator>(Copy);
if (BO && BO->getOpcode() == BO_Assign) {
// Perform simple memcpy for simple copying.
EmitAggregateAssign(DestAddr, SrcAddr, OriginalType);
} else {
// For arrays with complex element types perform element by element
// copying.
EmitOMPAggregateAssign(
DestAddr, SrcAddr, OriginalType,
[this, Copy, SrcVD, DestVD](Address DestElement, Address SrcElement) {
// Working with the single array element, so have to remap
// destination and source variables to corresponding array
// elements.
CodeGenFunction::OMPPrivateScope Remap(*this);
Remap.addPrivate(DestVD, [DestElement]() -> Address {
return DestElement;
});
Remap.addPrivate(
SrcVD, [SrcElement]() -> Address { return SrcElement; });
(void)Remap.Privatize();
EmitIgnoredExpr(Copy);
});
}
} else {
// Remap pseudo source variable to private copy.
CodeGenFunction::OMPPrivateScope Remap(*this);
Remap.addPrivate(SrcVD, [SrcAddr]() -> Address { return SrcAddr; });
Remap.addPrivate(DestVD, [DestAddr]() -> Address { return DestAddr; });
(void)Remap.Privatize();
// Emit copying of the whole variable.
EmitIgnoredExpr(Copy);
}
}
bool CodeGenFunction::EmitOMPFirstprivateClause(const OMPExecutableDirective &D,
OMPPrivateScope &PrivateScope) {
if (!HaveInsertPoint())
return false;
bool FirstprivateIsLastprivate = false;
llvm::DenseSet<const VarDecl *> Lastprivates;
for (const auto *C : D.getClausesOfKind<OMPLastprivateClause>()) {
for (const auto *D : C->varlists())
Lastprivates.insert(
cast<VarDecl>(cast<DeclRefExpr>(D)->getDecl())->getCanonicalDecl());
}
llvm::DenseSet<const VarDecl *> EmittedAsFirstprivate;
CGCapturedStmtInfo CapturesInfo(cast<CapturedStmt>(*D.getAssociatedStmt()));
for (const auto *C : D.getClausesOfKind<OMPFirstprivateClause>()) {
auto IRef = C->varlist_begin();
auto InitsRef = C->inits().begin();
for (auto IInit : C->private_copies()) {
auto *OrigVD = cast<VarDecl>(cast<DeclRefExpr>(*IRef)->getDecl());
bool ThisFirstprivateIsLastprivate =
Lastprivates.count(OrigVD->getCanonicalDecl()) > 0;
auto *CapFD = CapturesInfo.lookup(OrigVD);
auto *FD = CapturedStmtInfo->lookup(OrigVD);
if (!ThisFirstprivateIsLastprivate && FD && (FD == CapFD) &&
!FD->getType()->isReferenceType()) {
EmittedAsFirstprivate.insert(OrigVD->getCanonicalDecl());
++IRef;
++InitsRef;
continue;
}
FirstprivateIsLastprivate =
FirstprivateIsLastprivate || ThisFirstprivateIsLastprivate;
if (EmittedAsFirstprivate.insert(OrigVD->getCanonicalDecl()).second) {
auto *VD = cast<VarDecl>(cast<DeclRefExpr>(IInit)->getDecl());
auto *VDInit = cast<VarDecl>(cast<DeclRefExpr>(*InitsRef)->getDecl());
bool IsRegistered;
DeclRefExpr DRE(const_cast<VarDecl *>(OrigVD),
/*RefersToEnclosingVariableOrCapture=*/FD != nullptr,
(*IRef)->getType(), VK_LValue, (*IRef)->getExprLoc());
Address OriginalAddr = EmitLValue(&DRE).getAddress();
QualType Type = VD->getType();
if (Type->isArrayType()) {
// Emit VarDecl with copy init for arrays.
// Get the address of the original variable captured in current
// captured region.
IsRegistered = PrivateScope.addPrivate(OrigVD, [&]() -> Address {
auto Emission = EmitAutoVarAlloca(*VD);
auto *Init = VD->getInit();
if (!isa<CXXConstructExpr>(Init) || isTrivialInitializer(Init)) {
// Perform simple memcpy.
EmitAggregateAssign(Emission.getAllocatedAddress(), OriginalAddr,
Type);
} else {
EmitOMPAggregateAssign(
Emission.getAllocatedAddress(), OriginalAddr, Type,
[this, VDInit, Init](Address DestElement,
Address SrcElement) {
// Clean up any temporaries needed by the initialization.
RunCleanupsScope InitScope(*this);
// Emit initialization for single element.
setAddrOfLocalVar(VDInit, SrcElement);
EmitAnyExprToMem(Init, DestElement,
Init->getType().getQualifiers(),
/*IsInitializer*/ false);
LocalDeclMap.erase(VDInit);
});
}
EmitAutoVarCleanups(Emission);
return Emission.getAllocatedAddress();
});
} else {
IsRegistered = PrivateScope.addPrivate(OrigVD, [&]() -> Address {
// Emit private VarDecl with copy init.
// Remap temp VDInit variable to the address of the original
// variable
// (for proper handling of captured global variables).
setAddrOfLocalVar(VDInit, OriginalAddr);
EmitDecl(*VD);
LocalDeclMap.erase(VDInit);
return GetAddrOfLocalVar(VD);
});
}
assert(IsRegistered &&
"firstprivate var already registered as private");
// Silence the warning about unused variable.
(void)IsRegistered;
}
++IRef;
++InitsRef;
}
}
return FirstprivateIsLastprivate && !EmittedAsFirstprivate.empty();
}
void CodeGenFunction::EmitOMPPrivateClause(
const OMPExecutableDirective &D,
CodeGenFunction::OMPPrivateScope &PrivateScope) {
if (!HaveInsertPoint())
return;
llvm::DenseSet<const VarDecl *> EmittedAsPrivate;
for (const auto *C : D.getClausesOfKind<OMPPrivateClause>()) {
auto IRef = C->varlist_begin();
for (auto IInit : C->private_copies()) {
auto *OrigVD = cast<VarDecl>(cast<DeclRefExpr>(*IRef)->getDecl());
if (EmittedAsPrivate.insert(OrigVD->getCanonicalDecl()).second) {
auto VD = cast<VarDecl>(cast<DeclRefExpr>(IInit)->getDecl());
bool IsRegistered =
PrivateScope.addPrivate(OrigVD, [&]() -> Address {
// Emit private VarDecl with copy init.
EmitDecl(*VD);
return GetAddrOfLocalVar(VD);
});
assert(IsRegistered && "private var already registered as private");
// Silence the warning about unused variable.
(void)IsRegistered;
}
++IRef;
}
}
}
bool CodeGenFunction::EmitOMPCopyinClause(const OMPExecutableDirective &D) {
if (!HaveInsertPoint())
return false;
// threadprivate_var1 = master_threadprivate_var1;
// operator=(threadprivate_var2, master_threadprivate_var2);
// ...
// __kmpc_barrier(&loc, global_tid);
llvm::DenseSet<const VarDecl *> CopiedVars;
llvm::BasicBlock *CopyBegin = nullptr, *CopyEnd = nullptr;
for (const auto *C : D.getClausesOfKind<OMPCopyinClause>()) {
auto IRef = C->varlist_begin();
auto ISrcRef = C->source_exprs().begin();
auto IDestRef = C->destination_exprs().begin();
for (auto *AssignOp : C->assignment_ops()) {
auto *VD = cast<VarDecl>(cast<DeclRefExpr>(*IRef)->getDecl());
QualType Type = VD->getType();
if (CopiedVars.insert(VD->getCanonicalDecl()).second) {
// Get the address of the master variable. If we are emitting code with
// TLS support, the address is passed from the master as field in the
// captured declaration.
Address MasterAddr = Address::invalid();
if (getLangOpts().OpenMPUseTLS &&
getContext().getTargetInfo().isTLSSupported()) {
assert(CapturedStmtInfo->lookup(VD) &&
"Copyin threadprivates should have been captured!");
DeclRefExpr DRE(const_cast<VarDecl *>(VD), true, (*IRef)->getType(),
VK_LValue, (*IRef)->getExprLoc());
MasterAddr = EmitLValue(&DRE).getAddress();
LocalDeclMap.erase(VD);
} else {
MasterAddr =
Address(VD->isStaticLocal() ? CGM.getStaticLocalDeclAddress(VD)
: CGM.GetAddrOfGlobal(VD),
getContext().getDeclAlign(VD));
}
// Get the address of the threadprivate variable.
Address PrivateAddr = EmitLValue(*IRef).getAddress();
if (CopiedVars.size() == 1) {
// At first check if current thread is a master thread. If it is, no
// need to copy data.
CopyBegin = createBasicBlock("copyin.not.master");
CopyEnd = createBasicBlock("copyin.not.master.end");
Builder.CreateCondBr(
Builder.CreateICmpNE(
Builder.CreatePtrToInt(MasterAddr.getPointer(), CGM.IntPtrTy),
Builder.CreatePtrToInt(PrivateAddr.getPointer(), CGM.IntPtrTy)),
CopyBegin, CopyEnd);
EmitBlock(CopyBegin);
}
auto *SrcVD = cast<VarDecl>(cast<DeclRefExpr>(*ISrcRef)->getDecl());
auto *DestVD = cast<VarDecl>(cast<DeclRefExpr>(*IDestRef)->getDecl());
EmitOMPCopy(Type, PrivateAddr, MasterAddr, DestVD, SrcVD, AssignOp);
}
++IRef;
++ISrcRef;
++IDestRef;
}
}
if (CopyEnd) {
// Exit out of copying procedure for non-master thread.
EmitBlock(CopyEnd, /*IsFinished=*/true);
return true;
}
return false;
}
bool CodeGenFunction::EmitOMPLastprivateClauseInit(
const OMPExecutableDirective &D, OMPPrivateScope &PrivateScope) {
if (!HaveInsertPoint())
return false;
bool HasAtLeastOneLastprivate = false;
llvm::DenseSet<const VarDecl *> SIMDLCVs;
if (isOpenMPSimdDirective(D.getDirectiveKind())) {
auto *LoopDirective = cast<OMPLoopDirective>(&D);
for (auto *C : LoopDirective->counters()) {
SIMDLCVs.insert(
cast<VarDecl>(cast<DeclRefExpr>(C)->getDecl())->getCanonicalDecl());
}
}
llvm::DenseSet<const VarDecl *> AlreadyEmittedVars;
for (const auto *C : D.getClausesOfKind<OMPLastprivateClause>()) {
HasAtLeastOneLastprivate = true;
if (isOpenMPTaskLoopDirective(D.getDirectiveKind()))
break;
auto IRef = C->varlist_begin();
auto IDestRef = C->destination_exprs().begin();
for (auto *IInit : C->private_copies()) {
// Keep the address of the original variable for future update at the end
// of the loop.
auto *OrigVD = cast<VarDecl>(cast<DeclRefExpr>(*IRef)->getDecl());
// Taskloops do not require additional initialization, it is done in
// runtime support library.
if (AlreadyEmittedVars.insert(OrigVD->getCanonicalDecl()).second) {
auto *DestVD = cast<VarDecl>(cast<DeclRefExpr>(*IDestRef)->getDecl());
PrivateScope.addPrivate(DestVD, [this, OrigVD, IRef]() -> Address {
DeclRefExpr DRE(
const_cast<VarDecl *>(OrigVD),
/*RefersToEnclosingVariableOrCapture=*/CapturedStmtInfo->lookup(
OrigVD) != nullptr,
(*IRef)->getType(), VK_LValue, (*IRef)->getExprLoc());
return EmitLValue(&DRE).getAddress();
});
// Check if the variable is also a firstprivate: in this case IInit is
// not generated. Initialization of this variable will happen in codegen
// for 'firstprivate' clause.
if (IInit && !SIMDLCVs.count(OrigVD->getCanonicalDecl())) {
auto *VD = cast<VarDecl>(cast<DeclRefExpr>(IInit)->getDecl());
bool IsRegistered = PrivateScope.addPrivate(OrigVD, [&]() -> Address {
// Emit private VarDecl with copy init.
EmitDecl(*VD);
return GetAddrOfLocalVar(VD);
});
assert(IsRegistered &&
"lastprivate var already registered as private");
(void)IsRegistered;
}
}
++IRef;
++IDestRef;
}
}
return HasAtLeastOneLastprivate;
}
void CodeGenFunction::EmitOMPLastprivateClauseFinal(
const OMPExecutableDirective &D, bool NoFinals,
llvm::Value *IsLastIterCond) {
if (!HaveInsertPoint())
return;
// Emit following code:
// if (<IsLastIterCond>) {
// orig_var1 = private_orig_var1;
// ...
// orig_varn = private_orig_varn;
// }
llvm::BasicBlock *ThenBB = nullptr;
llvm::BasicBlock *DoneBB = nullptr;
if (IsLastIterCond) {
ThenBB = createBasicBlock(".omp.lastprivate.then");
DoneBB = createBasicBlock(".omp.lastprivate.done");
Builder.CreateCondBr(IsLastIterCond, ThenBB, DoneBB);
EmitBlock(ThenBB);
}
llvm::DenseSet<const VarDecl *> AlreadyEmittedVars;
llvm::DenseMap<const VarDecl *, const Expr *> LoopCountersAndUpdates;
if (auto *LoopDirective = dyn_cast<OMPLoopDirective>(&D)) {
auto IC = LoopDirective->counters().begin();
for (auto F : LoopDirective->finals()) {
auto *D =
cast<VarDecl>(cast<DeclRefExpr>(*IC)->getDecl())->getCanonicalDecl();
if (NoFinals)
AlreadyEmittedVars.insert(D);
else
LoopCountersAndUpdates[D] = F;
++IC;
}
}
for (const auto *C : D.getClausesOfKind<OMPLastprivateClause>()) {
auto IRef = C->varlist_begin();
auto ISrcRef = C->source_exprs().begin();
auto IDestRef = C->destination_exprs().begin();
for (auto *AssignOp : C->assignment_ops()) {
auto *PrivateVD = cast<VarDecl>(cast<DeclRefExpr>(*IRef)->getDecl());
QualType Type = PrivateVD->getType();
auto *CanonicalVD = PrivateVD->getCanonicalDecl();
if (AlreadyEmittedVars.insert(CanonicalVD).second) {
// If lastprivate variable is a loop control variable for loop-based
// directive, update its value before copyin back to original
// variable.
if (auto *FinalExpr = LoopCountersAndUpdates.lookup(CanonicalVD))
EmitIgnoredExpr(FinalExpr);
auto *SrcVD = cast<VarDecl>(cast<DeclRefExpr>(*ISrcRef)->getDecl());
auto *DestVD = cast<VarDecl>(cast<DeclRefExpr>(*IDestRef)->getDecl());
// Get the address of the original variable.
Address OriginalAddr = GetAddrOfLocalVar(DestVD);
// Get the address of the private variable.
Address PrivateAddr = GetAddrOfLocalVar(PrivateVD);
if (auto RefTy = PrivateVD->getType()->getAs<ReferenceType>())
PrivateAddr =
Address(Builder.CreateLoad(PrivateAddr),
getNaturalTypeAlignment(RefTy->getPointeeType()));
EmitOMPCopy(Type, OriginalAddr, PrivateAddr, DestVD, SrcVD, AssignOp);
}
++IRef;
++ISrcRef;
++IDestRef;
}
if (auto *PostUpdate = C->getPostUpdateExpr())
EmitIgnoredExpr(PostUpdate);
}
if (IsLastIterCond)
EmitBlock(DoneBB, /*IsFinished=*/true);
}
static Address castToBase(CodeGenFunction &CGF, QualType BaseTy, QualType ElTy,
LValue BaseLV, llvm::Value *Addr) {
Address Tmp = Address::invalid();
Address TopTmp = Address::invalid();
Address MostTopTmp = Address::invalid();
BaseTy = BaseTy.getNonReferenceType();
while ((BaseTy->isPointerType() || BaseTy->isReferenceType()) &&
!CGF.getContext().hasSameType(BaseTy, ElTy)) {
Tmp = CGF.CreateMemTemp(BaseTy);
if (TopTmp.isValid())
CGF.Builder.CreateStore(Tmp.getPointer(), TopTmp);
else
MostTopTmp = Tmp;
TopTmp = Tmp;
BaseTy = BaseTy->getPointeeType();
}
llvm::Type *Ty = BaseLV.getPointer()->getType();
if (Tmp.isValid())
Ty = Tmp.getElementType();
Addr = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(Addr, Ty);
if (Tmp.isValid()) {
CGF.Builder.CreateStore(Addr, Tmp);
return MostTopTmp;
}
return Address(Addr, BaseLV.getAlignment());
}
static LValue loadToBegin(CodeGenFunction &CGF, QualType BaseTy, QualType ElTy,
LValue BaseLV) {
BaseTy = BaseTy.getNonReferenceType();
while ((BaseTy->isPointerType() || BaseTy->isReferenceType()) &&
!CGF.getContext().hasSameType(BaseTy, ElTy)) {
if (auto *PtrTy = BaseTy->getAs<PointerType>())
BaseLV = CGF.EmitLoadOfPointerLValue(BaseLV.getAddress(), PtrTy);
else {
BaseLV = CGF.EmitLoadOfReferenceLValue(BaseLV.getAddress(),
BaseTy->castAs<ReferenceType>());
}
BaseTy = BaseTy->getPointeeType();
}
return CGF.MakeAddrLValue(
Address(
CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(
BaseLV.getPointer(), CGF.ConvertTypeForMem(ElTy)->getPointerTo()),
BaseLV.getAlignment()),
BaseLV.getType(), BaseLV.getAlignmentSource());
}
void CodeGenFunction::EmitOMPReductionClauseInit(
const OMPExecutableDirective &D,
CodeGenFunction::OMPPrivateScope &PrivateScope) {
if (!HaveInsertPoint())
return;
for (const auto *C : D.getClausesOfKind<OMPReductionClause>()) {
auto ILHS = C->lhs_exprs().begin();
auto IRHS = C->rhs_exprs().begin();
auto IPriv = C->privates().begin();
auto IRed = C->reduction_ops().begin();
for (auto IRef : C->varlists()) {
auto *LHSVD = cast<VarDecl>(cast<DeclRefExpr>(*ILHS)->getDecl());
auto *RHSVD = cast<VarDecl>(cast<DeclRefExpr>(*IRHS)->getDecl());
auto *PrivateVD = cast<VarDecl>(cast<DeclRefExpr>(*IPriv)->getDecl());
auto *DRD = getReductionInit(*IRed);
if (auto *OASE = dyn_cast<OMPArraySectionExpr>(IRef)) {
auto *Base = OASE->getBase()->IgnoreParenImpCasts();
while (auto *TempOASE = dyn_cast<OMPArraySectionExpr>(Base))
Base = TempOASE->getBase()->IgnoreParenImpCasts();
while (auto *TempASE = dyn_cast<ArraySubscriptExpr>(Base))
Base = TempASE->getBase()->IgnoreParenImpCasts();
auto *DE = cast<DeclRefExpr>(Base);
auto *OrigVD = cast<VarDecl>(DE->getDecl());
auto OASELValueLB = EmitOMPArraySectionExpr(OASE);
auto OASELValueUB =
EmitOMPArraySectionExpr(OASE, /*IsLowerBound=*/false);
auto OriginalBaseLValue = EmitLValue(DE);
LValue BaseLValue =
loadToBegin(*this, OrigVD->getType(), OASELValueLB.getType(),
OriginalBaseLValue);
// Store the address of the original variable associated with the LHS
// implicit variable.
PrivateScope.addPrivate(LHSVD, [OASELValueLB]() -> Address {
return OASELValueLB.getAddress();
});
// Emit reduction copy.
bool IsRegistered = PrivateScope.addPrivate(
OrigVD, [this, OrigVD, PrivateVD, BaseLValue, OASELValueLB,
OASELValueUB, OriginalBaseLValue, DRD, IRed]() -> Address {
// Emit VarDecl with copy init for arrays.
// Get the address of the original variable captured in current
// captured region.
auto *Size = Builder.CreatePtrDiff(OASELValueUB.getPointer(),
OASELValueLB.getPointer());