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CGStmtOpenMP.cpp
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//===--- CGStmtOpenMP.cpp - Emit LLVM Code from Statements ----------------===//
//
// 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 OpenMP nodes as LLVM code.
//
//===----------------------------------------------------------------------===//
#include "CGCleanup.h"
#include "CGOpenMPRuntime.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "TargetInfo.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/DeclOpenMP.h"
#include "clang/AST/OpenMPClause.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtOpenMP.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Basic/OpenMPKinds.h"
#include "clang/Basic/PrettyStackTrace.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/Frontend/OpenMP/OMPConstants.h"
#include "llvm/Frontend/OpenMP/OMPIRBuilder.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Metadata.h"
#include "llvm/Support/AtomicOrdering.h"
using namespace clang;
using namespace CodeGen;
using namespace llvm::omp;
static const VarDecl *getBaseDecl(const Expr *Ref);
namespace {
/// Lexical scope for OpenMP executable constructs, that handles correct codegen
/// for captured expressions.
class OMPLexicalScope : public CodeGenFunction::LexicalScope {
void emitPreInitStmt(CodeGenFunction &CGF, const OMPExecutableDirective &S) {
for (const auto *C : S.clauses()) {
if (const auto *CPI = OMPClauseWithPreInit::get(C)) {
if (const 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) &&
cast<BlockDecl>(CGF.CurCodeDecl)->capturesVariable(VD));
}
public:
OMPLexicalScope(
CodeGenFunction &CGF, const OMPExecutableDirective &S,
const llvm::Optional<OpenMPDirectiveKind> CapturedRegion = llvm::None,
const bool EmitPreInitStmt = true)
: CodeGenFunction::LexicalScope(CGF, S.getSourceRange()),
InlinedShareds(CGF) {
if (EmitPreInitStmt)
emitPreInitStmt(CGF, S);
if (!CapturedRegion.hasValue())
return;
assert(S.hasAssociatedStmt() &&
"Expected associated statement for inlined directive.");
const CapturedStmt *CS = S.getCapturedStmt(*CapturedRegion);
for (const auto &C : CS->captures()) {
if (C.capturesVariable() || C.capturesVariableByCopy()) {
auto *VD = C.getCapturedVar();
assert(VD == VD->getCanonicalDecl() &&
"Canonical decl must be captured.");
DeclRefExpr DRE(
CGF.getContext(), const_cast<VarDecl *>(VD),
isCapturedVar(CGF, VD) || (CGF.CapturedStmtInfo &&
InlinedShareds.isGlobalVarCaptured(VD)),
VD->getType().getNonReferenceType(), VK_LValue, C.getLocation());
InlinedShareds.addPrivate(VD, [&CGF, &DRE]() -> Address {
return CGF.EmitLValue(&DRE).getAddress(CGF);
});
}
}
(void)InlinedShareds.Privatize();
}
};
/// Lexical scope for OpenMP parallel construct, that handles correct codegen
/// for captured expressions.
class OMPParallelScope final : public OMPLexicalScope {
bool EmitPreInitStmt(const OMPExecutableDirective &S) {
OpenMPDirectiveKind Kind = S.getDirectiveKind();
return !(isOpenMPTargetExecutionDirective(Kind) ||
isOpenMPLoopBoundSharingDirective(Kind)) &&
isOpenMPParallelDirective(Kind);
}
public:
OMPParallelScope(CodeGenFunction &CGF, const OMPExecutableDirective &S)
: OMPLexicalScope(CGF, S, /*CapturedRegion=*/llvm::None,
EmitPreInitStmt(S)) {}
};
/// Lexical scope for OpenMP teams construct, that handles correct codegen
/// for captured expressions.
class OMPTeamsScope final : public OMPLexicalScope {
bool EmitPreInitStmt(const OMPExecutableDirective &S) {
OpenMPDirectiveKind Kind = S.getDirectiveKind();
return !isOpenMPTargetExecutionDirective(Kind) &&
isOpenMPTeamsDirective(Kind);
}
public:
OMPTeamsScope(CodeGenFunction &CGF, const OMPExecutableDirective &S)
: OMPLexicalScope(CGF, S, /*CapturedRegion=*/llvm::None,
EmitPreInitStmt(S)) {}
};
/// 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 OMPLoopBasedDirective &S) {
const DeclStmt *PreInits;
CodeGenFunction::OMPMapVars PreCondVars;
if (auto *LD = dyn_cast<OMPLoopDirective>(&S)) {
llvm::DenseSet<const VarDecl *> EmittedAsPrivate;
for (const auto *E : LD->counters()) {
const auto *VD = cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl());
EmittedAsPrivate.insert(VD->getCanonicalDecl());
(void)PreCondVars.setVarAddr(
CGF, VD, CGF.CreateMemTemp(VD->getType().getNonReferenceType()));
}
// Mark private vars as undefs.
for (const auto *C : LD->getClausesOfKind<OMPPrivateClause>()) {
for (const Expr *IRef : C->varlists()) {
const auto *OrigVD =
cast<VarDecl>(cast<DeclRefExpr>(IRef)->getDecl());
if (EmittedAsPrivate.insert(OrigVD->getCanonicalDecl()).second) {
(void)PreCondVars.setVarAddr(
CGF, OrigVD,
Address(llvm::UndefValue::get(CGF.ConvertTypeForMem(
CGF.getContext().getPointerType(
OrigVD->getType().getNonReferenceType()))),
CGF.getContext().getDeclAlign(OrigVD)));
}
}
}
(void)PreCondVars.apply(CGF);
// Emit init, __range and __end variables for C++ range loops.
(void)OMPLoopBasedDirective::doForAllLoops(
LD->getInnermostCapturedStmt()->getCapturedStmt(),
/*TryImperfectlyNestedLoops=*/true, LD->getLoopsNumber(),
[&CGF](unsigned Cnt, const Stmt *CurStmt) {
if (const auto *CXXFor = dyn_cast<CXXForRangeStmt>(CurStmt)) {
if (const Stmt *Init = CXXFor->getInit())
CGF.EmitStmt(Init);
CGF.EmitStmt(CXXFor->getRangeStmt());
CGF.EmitStmt(CXXFor->getEndStmt());
}
return false;
});
PreInits = cast_or_null<DeclStmt>(LD->getPreInits());
} else if (const auto *Tile = dyn_cast<OMPTileDirective>(&S)) {
PreInits = cast_or_null<DeclStmt>(Tile->getPreInits());
} else if (const auto *Unroll = dyn_cast<OMPUnrollDirective>(&S)) {
PreInits = cast_or_null<DeclStmt>(Unroll->getPreInits());
} else {
llvm_unreachable("Unknown loop-based directive kind.");
}
if (PreInits) {
for (const auto *I : PreInits->decls())
CGF.EmitVarDecl(cast<VarDecl>(*I));
}
PreCondVars.restore(CGF);
}
public:
OMPLoopScope(CodeGenFunction &CGF, const OMPLoopBasedDirective &S)
: CodeGenFunction::RunCleanupsScope(CGF) {
emitPreInitStmt(CGF, S);
}
};
class OMPSimdLexicalScope : public CodeGenFunction::LexicalScope {
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) &&
cast<BlockDecl>(CGF.CurCodeDecl)->capturesVariable(VD));
}
public:
OMPSimdLexicalScope(CodeGenFunction &CGF, const OMPExecutableDirective &S)
: CodeGenFunction::LexicalScope(CGF, S.getSourceRange()),
InlinedShareds(CGF) {
for (const auto *C : S.clauses()) {
if (const auto *CPI = OMPClauseWithPreInit::get(C)) {
if (const 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);
}
}
}
} else if (const auto *UDP = dyn_cast<OMPUseDevicePtrClause>(C)) {
for (const Expr *E : UDP->varlists()) {
const Decl *D = cast<DeclRefExpr>(E)->getDecl();
if (const auto *OED = dyn_cast<OMPCapturedExprDecl>(D))
CGF.EmitVarDecl(*OED);
}
} else if (const auto *UDP = dyn_cast<OMPUseDeviceAddrClause>(C)) {
for (const Expr *E : UDP->varlists()) {
const Decl *D = getBaseDecl(E);
if (const auto *OED = dyn_cast<OMPCapturedExprDecl>(D))
CGF.EmitVarDecl(*OED);
}
}
}
if (!isOpenMPSimdDirective(S.getDirectiveKind()))
CGF.EmitOMPPrivateClause(S, InlinedShareds);
if (const auto *TG = dyn_cast<OMPTaskgroupDirective>(&S)) {
if (const Expr *E = TG->getReductionRef())
CGF.EmitVarDecl(*cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl()));
}
// Temp copy arrays for inscan reductions should not be emitted as they are
// not used in simd only mode.
llvm::DenseSet<CanonicalDeclPtr<const Decl>> CopyArrayTemps;
for (const auto *C : S.getClausesOfKind<OMPReductionClause>()) {
if (C->getModifier() != OMPC_REDUCTION_inscan)
continue;
for (const Expr *E : C->copy_array_temps())
CopyArrayTemps.insert(cast<DeclRefExpr>(E)->getDecl());
}
const auto *CS = cast_or_null<CapturedStmt>(S.getAssociatedStmt());
while (CS) {
for (auto &C : CS->captures()) {
if (C.capturesVariable() || C.capturesVariableByCopy()) {
auto *VD = C.getCapturedVar();
if (CopyArrayTemps.contains(VD))
continue;
assert(VD == VD->getCanonicalDecl() &&
"Canonical decl must be captured.");
DeclRefExpr DRE(CGF.getContext(), const_cast<VarDecl *>(VD),
isCapturedVar(CGF, VD) ||
(CGF.CapturedStmtInfo &&
InlinedShareds.isGlobalVarCaptured(VD)),
VD->getType().getNonReferenceType(), VK_LValue,
C.getLocation());
InlinedShareds.addPrivate(VD, [&CGF, &DRE]() -> Address {
return CGF.EmitLValue(&DRE).getAddress(CGF);
});
}
}
CS = dyn_cast<CapturedStmt>(CS->getCapturedStmt());
}
(void)InlinedShareds.Privatize();
}
};
} // namespace
static void emitCommonOMPTargetDirective(CodeGenFunction &CGF,
const OMPExecutableDirective &S,
const RegionCodeGenTy &CodeGen);
LValue CodeGenFunction::EmitOMPSharedLValue(const Expr *E) {
if (const auto *OrigDRE = dyn_cast<DeclRefExpr>(E)) {
if (const auto *OrigVD = dyn_cast<VarDecl>(OrigDRE->getDecl())) {
OrigVD = OrigVD->getCanonicalDecl();
bool IsCaptured =
LambdaCaptureFields.lookup(OrigVD) ||
(CapturedStmtInfo && CapturedStmtInfo->lookup(OrigVD)) ||
(CurCodeDecl && isa<BlockDecl>(CurCodeDecl));
DeclRefExpr DRE(getContext(), const_cast<VarDecl *>(OrigVD), IsCaptured,
OrigDRE->getType(), VK_LValue, OrigDRE->getExprLoc());
return EmitLValue(&DRE);
}
}
return EmitLValue(E);
}
llvm::Value *CodeGenFunction::getTypeSize(QualType Ty) {
ASTContext &C = getContext();
llvm::Value *Size = nullptr;
auto SizeInChars = C.getTypeSizeInChars(Ty);
if (SizeInChars.isZero()) {
// getTypeSizeInChars() returns 0 for a VLA.
while (const VariableArrayType *VAT = C.getAsVariableArrayType(Ty)) {
VlaSizePair VlaSize = getVLASize(VAT);
Ty = VlaSize.Type;
Size =
Size ? Builder.CreateNUWMul(Size, VlaSize.NumElts) : VlaSize.NumElts;
}
SizeInChars = C.getTypeSizeInChars(Ty);
if (SizeInChars.isZero())
return llvm::ConstantInt::get(SizeTy, /*V=*/0);
return Builder.CreateNUWMul(Size, CGM.getSize(SizeInChars));
}
return CGM.getSize(SizeInChars);
}
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()) {
const VariableArrayType *VAT = CurField->getCapturedVLAType();
llvm::Value *Val = VLASizeMap[VAT->getSizeExpr()];
CapturedVars.push_back(Val);
} else if (CurCap->capturesThis()) {
CapturedVars.push_back(CXXThisValue);
} else if (CurCap->capturesVariableByCopy()) {
llvm::Value *CV = EmitLoadOfScalar(EmitLValue(*I), CurCap->getLocation());
// 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()) {
ASTContext &Ctx = getContext();
Address DstAddr = CreateMemTemp(
Ctx.getUIntPtrType(),
Twine(CurCap->getCapturedVar()->getName(), ".casted"));
LValue DstLV = MakeAddrLValue(DstAddr, Ctx.getUIntPtrType());
llvm::Value *SrcAddrVal = EmitScalarConversion(
DstAddr.getPointer(), Ctx.getPointerType(Ctx.getUIntPtrType()),
Ctx.getPointerType(CurField->getType()), CurCap->getLocation());
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 = EmitLoadOfScalar(DstLV, CurCap->getLocation());
}
CapturedVars.push_back(CV);
} else {
assert(CurCap->capturesVariable() && "Expected capture by reference.");
CapturedVars.push_back(EmitLValue(*I).getAddress(*this).getPointer());
}
}
}
static Address castValueFromUintptr(CodeGenFunction &CGF, SourceLocation Loc,
QualType DstType, StringRef Name,
LValue AddrLV) {
ASTContext &Ctx = CGF.getContext();
llvm::Value *CastedPtr = CGF.EmitScalarConversion(
AddrLV.getAddress(CGF).getPointer(), Ctx.getUIntPtrType(),
Ctx.getPointerType(DstType), Loc);
Address TmpAddr =
CGF.MakeNaturalAlignAddrLValue(CastedPtr, DstType).getAddress(CGF);
return TmpAddr;
}
static QualType getCanonicalParamType(ASTContext &C, QualType T) {
if (T->isLValueReferenceType())
return C.getLValueReferenceType(
getCanonicalParamType(C, T.getNonReferenceType()),
/*SpelledAsLValue=*/false);
if (T->isPointerType())
return C.getPointerType(getCanonicalParamType(C, T->getPointeeType()));
if (const ArrayType *A = T->getAsArrayTypeUnsafe()) {
if (const auto *VLA = dyn_cast<VariableArrayType>(A))
return getCanonicalParamType(C, VLA->getElementType());
if (!A->isVariablyModifiedType())
return C.getCanonicalType(T);
}
return C.getCanonicalParamType(T);
}
namespace {
/// Contains required data for proper outlined function codegen.
struct FunctionOptions {
/// Captured statement for which the function is generated.
const CapturedStmt *S = nullptr;
/// true if cast to/from UIntPtr is required for variables captured by
/// value.
const bool UIntPtrCastRequired = true;
/// true if only casted arguments must be registered as local args or VLA
/// sizes.
const bool RegisterCastedArgsOnly = false;
/// Name of the generated function.
const StringRef FunctionName;
/// Location of the non-debug version of the outlined function.
SourceLocation Loc;
explicit FunctionOptions(const CapturedStmt *S, bool UIntPtrCastRequired,
bool RegisterCastedArgsOnly, StringRef FunctionName,
SourceLocation Loc)
: S(S), UIntPtrCastRequired(UIntPtrCastRequired),
RegisterCastedArgsOnly(UIntPtrCastRequired && RegisterCastedArgsOnly),
FunctionName(FunctionName), Loc(Loc) {}
};
} // namespace
static llvm::Function *emitOutlinedFunctionPrologue(
CodeGenFunction &CGF, FunctionArgList &Args,
llvm::MapVector<const Decl *, std::pair<const VarDecl *, Address>>
&LocalAddrs,
llvm::DenseMap<const Decl *, std::pair<const Expr *, llvm::Value *>>
&VLASizes,
llvm::Value *&CXXThisValue, const FunctionOptions &FO) {
const CapturedDecl *CD = FO.S->getCapturedDecl();
const RecordDecl *RD = FO.S->getCapturedRecordDecl();
assert(CD->hasBody() && "missing CapturedDecl body");
CXXThisValue = nullptr;
// Build the argument list.
CodeGenModule &CGM = CGF.CGM;
ASTContext &Ctx = CGM.getContext();
FunctionArgList TargetArgs;
Args.append(CD->param_begin(),
std::next(CD->param_begin(), CD->getContextParamPosition()));
TargetArgs.append(
CD->param_begin(),
std::next(CD->param_begin(), CD->getContextParamPosition()));
auto I = FO.S->captures().begin();
FunctionDecl *DebugFunctionDecl = nullptr;
if (!FO.UIntPtrCastRequired) {
FunctionProtoType::ExtProtoInfo EPI;
QualType FunctionTy = Ctx.getFunctionType(Ctx.VoidTy, llvm::None, EPI);
DebugFunctionDecl = FunctionDecl::Create(
Ctx, Ctx.getTranslationUnitDecl(), FO.S->getBeginLoc(),
SourceLocation(), DeclarationName(), FunctionTy,
Ctx.getTrivialTypeSourceInfo(FunctionTy), SC_Static,
/*UsesFPIntrin=*/false, /*isInlineSpecified=*/false,
/*hasWrittenPrototype=*/false);
}
for (const FieldDecl *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 (FO.UIntPtrCastRequired &&
((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 = &Ctx.Idents.get("this");
} else {
assert(I->capturesVariableArrayType());
II = &Ctx.Idents.get("vla");
}
if (ArgType->isVariablyModifiedType())
ArgType = getCanonicalParamType(Ctx, ArgType);
VarDecl *Arg;
if (DebugFunctionDecl && (CapVar || I->capturesThis())) {
Arg = ParmVarDecl::Create(
Ctx, DebugFunctionDecl,
CapVar ? CapVar->getBeginLoc() : FD->getBeginLoc(),
CapVar ? CapVar->getLocation() : FD->getLocation(), II, ArgType,
/*TInfo=*/nullptr, SC_None, /*DefArg=*/nullptr);
} else {
Arg = ImplicitParamDecl::Create(Ctx, /*DC=*/nullptr, FD->getLocation(),
II, ArgType, ImplicitParamDecl::Other);
}
Args.emplace_back(Arg);
// Do not cast arguments if we emit function with non-original types.
TargetArgs.emplace_back(
FO.UIntPtrCastRequired
? Arg
: CGM.getOpenMPRuntime().translateParameter(FD, Arg));
++I;
}
Args.append(std::next(CD->param_begin(), CD->getContextParamPosition() + 1),
CD->param_end());
TargetArgs.append(
std::next(CD->param_begin(), CD->getContextParamPosition() + 1),
CD->param_end());
// Create the function declaration.
const CGFunctionInfo &FuncInfo =
CGM.getTypes().arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, TargetArgs);
llvm::FunctionType *FuncLLVMTy = CGM.getTypes().GetFunctionType(FuncInfo);
auto *F =
llvm::Function::Create(FuncLLVMTy, llvm::GlobalValue::InternalLinkage,
FO.FunctionName, &CGM.getModule());
CGM.SetInternalFunctionAttributes(CD, F, FuncInfo);
if (CD->isNothrow())
F->setDoesNotThrow();
F->setDoesNotRecurse();
// Always inline the outlined function if optimizations are enabled.
if (CGM.getCodeGenOpts().OptimizationLevel != 0) {
F->removeFnAttr(llvm::Attribute::NoInline);
F->addFnAttr(llvm::Attribute::AlwaysInline);
}
// Generate the function.
CGF.StartFunction(CD, Ctx.VoidTy, F, FuncInfo, TargetArgs,
FO.UIntPtrCastRequired ? FO.Loc : FO.S->getBeginLoc(),
FO.UIntPtrCastRequired ? FO.Loc
: CD->getBody()->getBeginLoc());
unsigned Cnt = CD->getContextParamPosition();
I = FO.S->captures().begin();
for (const FieldDecl *FD : RD->fields()) {
// Do not map arguments if we emit function with non-original types.
Address LocalAddr(Address::invalid());
if (!FO.UIntPtrCastRequired && Args[Cnt] != TargetArgs[Cnt]) {
LocalAddr = CGM.getOpenMPRuntime().getParameterAddress(CGF, Args[Cnt],
TargetArgs[Cnt]);
} else {
LocalAddr = CGF.GetAddrOfLocalVar(Args[Cnt]);
}
// 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();
if (!FO.RegisterCastedArgsOnly)
LocalAddrs.insert({Args[Cnt], {CurVD, LocalAddr}});
++Cnt;
++I;
continue;
}
LValue ArgLVal = CGF.MakeAddrLValue(LocalAddr, Args[Cnt]->getType(),
AlignmentSource::Decl);
if (FD->hasCapturedVLAType()) {
if (FO.UIntPtrCastRequired) {
ArgLVal = CGF.MakeAddrLValue(
castValueFromUintptr(CGF, I->getLocation(), FD->getType(),
Args[Cnt]->getName(), ArgLVal),
FD->getType(), AlignmentSource::Decl);
}
llvm::Value *ExprArg = CGF.EmitLoadOfScalar(ArgLVal, I->getLocation());
const VariableArrayType *VAT = FD->getCapturedVLAType();
VLASizes.try_emplace(Args[Cnt], VAT->getSizeExpr(), ExprArg);
} else if (I->capturesVariable()) {
const VarDecl *Var = I->getCapturedVar();
QualType VarTy = Var->getType();
Address ArgAddr = ArgLVal.getAddress(CGF);
if (ArgLVal.getType()->isLValueReferenceType()) {
ArgAddr = CGF.EmitLoadOfReference(ArgLVal);
} else if (!VarTy->isVariablyModifiedType() || !VarTy->isPointerType()) {
assert(ArgLVal.getType()->isPointerType());
ArgAddr = CGF.EmitLoadOfPointer(
ArgAddr, ArgLVal.getType()->castAs<PointerType>());
}
if (!FO.RegisterCastedArgsOnly) {
LocalAddrs.insert(
{Args[Cnt],
{Var, Address(ArgAddr.getPointer(), Ctx.getDeclAlign(Var))}});
}
} else if (I->capturesVariableByCopy()) {
assert(!FD->getType()->isAnyPointerType() &&
"Not expecting a captured pointer.");
const VarDecl *Var = I->getCapturedVar();
LocalAddrs.insert({Args[Cnt],
{Var, FO.UIntPtrCastRequired
? castValueFromUintptr(
CGF, I->getLocation(), FD->getType(),
Args[Cnt]->getName(), ArgLVal)
: ArgLVal.getAddress(CGF)}});
} else {
// If 'this' is captured, load it into CXXThisValue.
assert(I->capturesThis());
CXXThisValue = CGF.EmitLoadOfScalar(ArgLVal, I->getLocation());
LocalAddrs.insert({Args[Cnt], {nullptr, ArgLVal.getAddress(CGF)}});
}
++Cnt;
++I;
}
return F;
}
llvm::Function *
CodeGenFunction::GenerateOpenMPCapturedStmtFunction(const CapturedStmt &S,
SourceLocation Loc) {
assert(
CapturedStmtInfo &&
"CapturedStmtInfo should be set when generating the captured function");
const CapturedDecl *CD = S.getCapturedDecl();
// Build the argument list.
bool NeedWrapperFunction =
getDebugInfo() && CGM.getCodeGenOpts().hasReducedDebugInfo();
FunctionArgList Args;
llvm::MapVector<const Decl *, std::pair<const VarDecl *, Address>> LocalAddrs;
llvm::DenseMap<const Decl *, std::pair<const Expr *, llvm::Value *>> VLASizes;
SmallString<256> Buffer;
llvm::raw_svector_ostream Out(Buffer);
Out << CapturedStmtInfo->getHelperName();
if (NeedWrapperFunction)
Out << "_debug__";
FunctionOptions FO(&S, !NeedWrapperFunction, /*RegisterCastedArgsOnly=*/false,
Out.str(), Loc);
llvm::Function *F = emitOutlinedFunctionPrologue(*this, Args, LocalAddrs,
VLASizes, CXXThisValue, FO);
CodeGenFunction::OMPPrivateScope LocalScope(*this);
for (const auto &LocalAddrPair : LocalAddrs) {
if (LocalAddrPair.second.first) {
LocalScope.addPrivate(LocalAddrPair.second.first, [&LocalAddrPair]() {
return LocalAddrPair.second.second;
});
}
}
(void)LocalScope.Privatize();
for (const auto &VLASizePair : VLASizes)
VLASizeMap[VLASizePair.second.first] = VLASizePair.second.second;
PGO.assignRegionCounters(GlobalDecl(CD), F);
CapturedStmtInfo->EmitBody(*this, CD->getBody());
(void)LocalScope.ForceCleanup();
FinishFunction(CD->getBodyRBrace());
if (!NeedWrapperFunction)
return F;
FunctionOptions WrapperFO(&S, /*UIntPtrCastRequired=*/true,
/*RegisterCastedArgsOnly=*/true,
CapturedStmtInfo->getHelperName(), Loc);
CodeGenFunction WrapperCGF(CGM, /*suppressNewContext=*/true);
WrapperCGF.CapturedStmtInfo = CapturedStmtInfo;
Args.clear();
LocalAddrs.clear();
VLASizes.clear();
llvm::Function *WrapperF =
emitOutlinedFunctionPrologue(WrapperCGF, Args, LocalAddrs, VLASizes,
WrapperCGF.CXXThisValue, WrapperFO);
llvm::SmallVector<llvm::Value *, 4> CallArgs;
auto *PI = F->arg_begin();
for (const auto *Arg : Args) {
llvm::Value *CallArg;
auto I = LocalAddrs.find(Arg);
if (I != LocalAddrs.end()) {
LValue LV = WrapperCGF.MakeAddrLValue(
I->second.second,
I->second.first ? I->second.first->getType() : Arg->getType(),
AlignmentSource::Decl);
if (LV.getType()->isAnyComplexType())
LV.setAddress(WrapperCGF.Builder.CreatePointerBitCastOrAddrSpaceCast(
LV.getAddress(WrapperCGF),
PI->getType()->getPointerTo(
LV.getAddress(WrapperCGF).getAddressSpace())));
CallArg = WrapperCGF.EmitLoadOfScalar(LV, S.getBeginLoc());
} else {
auto EI = VLASizes.find(Arg);
if (EI != VLASizes.end()) {
CallArg = EI->second.second;
} else {
LValue LV =
WrapperCGF.MakeAddrLValue(WrapperCGF.GetAddrOfLocalVar(Arg),
Arg->getType(), AlignmentSource::Decl);
CallArg = WrapperCGF.EmitLoadOfScalar(LV, S.getBeginLoc());
}
}
CallArgs.emplace_back(WrapperCGF.EmitFromMemory(CallArg, Arg->getType()));
++PI;
}
CGM.getOpenMPRuntime().emitOutlinedFunctionCall(WrapperCGF, Loc, F, CallArgs);
WrapperCGF.FinishFunction();
return WrapperF;
}
//===----------------------------------------------------------------------===//
// 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.
const ArrayType *ArrayTy = OriginalType->getAsArrayTypeUnsafe();
llvm::Value *NumElements = emitArrayLength(ArrayTy, ElementTy, DestAddr);
SrcAddr = Builder.CreateElementBitCast(SrcAddr, DestAddr.getElementType());
llvm::Value *SrcBegin = SrcAddr.getPointer();
llvm::Value *DestBegin = DestAddr.getPointer();
// Cast from pointer to array type to pointer to single element.
llvm::Value *DestEnd =
Builder.CreateGEP(DestAddr.getElementType(), DestBegin, NumElements);
// The basic structure here is a while-do loop.
llvm::BasicBlock *BodyBB = createBasicBlock("omp.arraycpy.body");
llvm::BasicBlock *DoneBB = createBasicBlock("omp.arraycpy.done");
llvm::Value *IsEmpty =
Builder.CreateICmpEQ(DestBegin, DestEnd, "omp.arraycpy.isempty");
Builder.CreateCondBr(IsEmpty, DoneBB, BodyBB);
// Enter the loop body, making that address the current address.
llvm::BasicBlock *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.
llvm::Value *DestElementNext =
Builder.CreateConstGEP1_32(DestAddr.getElementType(), DestElementPHI,
/*Idx0=*/1, "omp.arraycpy.dest.element");
llvm::Value *SrcElementNext =
Builder.CreateConstGEP1_32(SrcAddr.getElementType(), SrcElementPHI,
/*Idx0=*/1, "omp.arraycpy.src.element");
// Check whether we've reached the end.
llvm::Value *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);
}
void CodeGenFunction::EmitOMPCopy(QualType OriginalType, Address DestAddr,
Address SrcAddr, const VarDecl *DestVD,
const VarDecl *SrcVD, const Expr *Copy) {
if (OriginalType->isArrayType()) {
const auto *BO = dyn_cast<BinaryOperator>(Copy);
if (BO && BO->getOpcode() == BO_Assign) {
// Perform simple memcpy for simple copying.
LValue Dest = MakeAddrLValue(DestAddr, OriginalType);
LValue Src = MakeAddrLValue(SrcAddr, OriginalType);
EmitAggregateAssign(Dest, Src, 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]() { return DestElement; });
Remap.addPrivate(SrcVD, [SrcElement]() { return SrcElement; });
(void)Remap.Privatize();
EmitIgnoredExpr(Copy);
});
}
} else {
// Remap pseudo source variable to private copy.
CodeGenFunction::OMPPrivateScope Remap(*this);
Remap.addPrivate(SrcVD, [SrcAddr]() { return SrcAddr; });
Remap.addPrivate(DestVD, [DestAddr]() { 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 DeviceConstTarget =
getLangOpts().OpenMPIsDevice &&
isOpenMPTargetExecutionDirective(D.getDirectiveKind());
bool FirstprivateIsLastprivate = false;
llvm::DenseMap<const VarDecl *, OpenMPLastprivateModifier> Lastprivates;
for (const auto *C : D.getClausesOfKind<OMPLastprivateClause>()) {
for (const auto *D : C->varlists())
Lastprivates.try_emplace(
cast<VarDecl>(cast<DeclRefExpr>(D)->getDecl())->getCanonicalDecl(),
C->getKind());
}
llvm::DenseSet<const VarDecl *> EmittedAsFirstprivate;
llvm::SmallVector<OpenMPDirectiveKind, 4> CaptureRegions;
getOpenMPCaptureRegions(CaptureRegions, D.getDirectiveKind());
// Force emission of the firstprivate copy if the directive does not emit
// outlined function, like omp for, omp simd, omp distribute etc.
bool MustEmitFirstprivateCopy =
CaptureRegions.size() == 1 && CaptureRegions.back() == OMPD_unknown;
for (const auto *C : D.getClausesOfKind<OMPFirstprivateClause>()) {
const auto *IRef = C->varlist_begin();
const auto *InitsRef = C->inits().begin();
for (const Expr *IInit : C->private_copies()) {
const auto *OrigVD = cast<VarDecl>(cast<DeclRefExpr>(*IRef)->getDecl());
bool ThisFirstprivateIsLastprivate =
Lastprivates.count(OrigVD->getCanonicalDecl()) > 0;
const FieldDecl *FD = CapturedStmtInfo->lookup(OrigVD);
const auto *VD = cast<VarDecl>(cast<DeclRefExpr>(IInit)->getDecl());
if (!MustEmitFirstprivateCopy && !ThisFirstprivateIsLastprivate && FD &&
!FD->getType()->isReferenceType() &&
(!VD || !VD->hasAttr<OMPAllocateDeclAttr>())) {
EmittedAsFirstprivate.insert(OrigVD->getCanonicalDecl());
++IRef;
++InitsRef;
continue;
}
// Do not emit copy for firstprivate constant variables in target regions,
// captured by reference.
if (DeviceConstTarget && OrigVD->getType().isConstant(getContext()) &&
FD && FD->getType()->isReferenceType() &&
(!VD || !VD->hasAttr<OMPAllocateDeclAttr>())) {
EmittedAsFirstprivate.insert(OrigVD->getCanonicalDecl());
++IRef;
++InitsRef;
continue;
}
FirstprivateIsLastprivate =
FirstprivateIsLastprivate || ThisFirstprivateIsLastprivate;
if (EmittedAsFirstprivate.insert(OrigVD->getCanonicalDecl()).second) {
const auto *VDInit =
cast<VarDecl>(cast<DeclRefExpr>(*InitsRef)->getDecl());
bool IsRegistered;
DeclRefExpr DRE(getContext(), const_cast<VarDecl *>(OrigVD),
/*RefersToEnclosingVariableOrCapture=*/FD != nullptr,
(*IRef)->getType(), VK_LValue, (*IRef)->getExprLoc());
LValue OriginalLVal;
if (!FD) {
// Check if the firstprivate variable is just a constant value.
ConstantEmission CE = tryEmitAsConstant(&DRE);
if (CE && !CE.isReference()) {
// Constant value, no need to create a copy.
++IRef;
++InitsRef;
continue;
}
if (CE && CE.isReference()) {
OriginalLVal = CE.getReferenceLValue(*this, &DRE);
} else {
assert(!CE && "Expected non-constant firstprivate.");
OriginalLVal = EmitLValue(&DRE);
}
} else {
OriginalLVal = EmitLValue(&DRE);
}
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, [this, VD, Type, OriginalLVal, VDInit]() {
AutoVarEmission Emission = EmitAutoVarAlloca(*VD);
const Expr *Init = VD->getInit();
if (!isa<CXXConstructExpr>(Init) ||
isTrivialInitializer(Init)) {
// Perform simple memcpy.
LValue Dest =
MakeAddrLValue(Emission.getAllocatedAddress(), Type);
EmitAggregateAssign(Dest, OriginalLVal, Type);
} else {
EmitOMPAggregateAssign(
Emission.getAllocatedAddress(),
OriginalLVal.getAddress(*this), 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 {
Address OriginalAddr = OriginalLVal.getAddress(*this);
IsRegistered =
PrivateScope.addPrivate(OrigVD, [this, VDInit, OriginalAddr, VD,
ThisFirstprivateIsLastprivate,
OrigVD, &Lastprivates, IRef]() {
// 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);
if (ThisFirstprivateIsLastprivate &&
Lastprivates[OrigVD->getCanonicalDecl()] ==
OMPC_LASTPRIVATE_conditional) {
// Create/init special variable for lastprivate conditionals.
Address VDAddr =
CGM.getOpenMPRuntime().emitLastprivateConditionalInit(
*this, OrigVD);
llvm::Value *V = EmitLoadOfScalar(
MakeAddrLValue(GetAddrOfLocalVar(VD), (*IRef)->getType(),
AlignmentSource::Decl),
(*IRef)->getExprLoc());
EmitStoreOfScalar(V,
MakeAddrLValue(VDAddr, (*IRef)->getType(),
AlignmentSource::Decl));
LocalDeclMap.erase(VD);
setAddrOfLocalVar(VD, VDAddr);
return VDAddr;
}
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 (const Expr *IInit : C->private_copies()) {
const auto *OrigVD = cast<VarDecl>(cast<DeclRefExpr>(*IRef)->getDecl());
if (EmittedAsPrivate.insert(OrigVD->getCanonicalDecl()).second) {
const auto *VD = cast<VarDecl>(cast<DeclRefExpr>(IInit)->getDecl());
bool IsRegistered = PrivateScope.addPrivate(OrigVD, [this, VD]() {
// 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 (const Expr *AssignOp : C->assignment_ops()) {
const 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();