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llvm-project/clang/lib/CodeGen/CGOpenMPRuntime.cpp

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//===----- CGOpenMPRuntime.cpp - Interface to OpenMP Runtimes -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This provides a class for OpenMP runtime code generation.
//
//===----------------------------------------------------------------------===//
#include "CGOpenMPRuntime.h"
#include "CodeGenFunction.h"
#include "clang/AST/StmtOpenMP.h"
#include "clang/AST/Decl.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Value.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
using namespace clang;
using namespace CodeGen;
namespace {
/// \brief API for captured statement code generation in OpenMP constructs.
class CGOpenMPRegionInfo : public CodeGenFunction::CGCapturedStmtInfo {
public:
CGOpenMPRegionInfo(const OMPExecutableDirective &D, const CapturedStmt &CS,
const VarDecl *ThreadIDVar)
: CGCapturedStmtInfo(CS, CR_OpenMP), ThreadIDVar(ThreadIDVar),
Directive(D) {
assert(ThreadIDVar != nullptr && "No ThreadID in OpenMP region.");
}
/// \brief Gets a variable or parameter for storing global thread id
/// inside OpenMP construct.
const VarDecl *getThreadIDVariable() const { return ThreadIDVar; }
/// \brief Gets an LValue for the current ThreadID variable.
LValue getThreadIDVariableLValue(CodeGenFunction &CGF);
static bool classof(const CGCapturedStmtInfo *Info) {
return Info->getKind() == CR_OpenMP;
}
/// \brief Emit the captured statement body.
void EmitBody(CodeGenFunction &CGF, Stmt *S) override;
/// \brief Get the name of the capture helper.
StringRef getHelperName() const override { return ".omp_outlined."; }
private:
/// \brief A variable or parameter storing global thread id for OpenMP
/// constructs.
const VarDecl *ThreadIDVar;
/// \brief OpenMP executable directive associated with the region.
const OMPExecutableDirective &Directive;
};
} // namespace
LValue CGOpenMPRegionInfo::getThreadIDVariableLValue(CodeGenFunction &CGF) {
return CGF.MakeNaturalAlignAddrLValue(
CGF.GetAddrOfLocalVar(ThreadIDVar),
CGF.getContext().getPointerType(ThreadIDVar->getType()));
}
void CGOpenMPRegionInfo::EmitBody(CodeGenFunction &CGF, Stmt *S) {
CodeGenFunction::OMPPrivateScope PrivateScope(CGF);
CGF.EmitOMPPrivateClause(Directive, PrivateScope);
CGF.EmitOMPFirstprivateClause(Directive, PrivateScope);
if (PrivateScope.Privatize()) {
// Emit implicit barrier to synchronize threads and avoid data races.
auto Flags = static_cast<CGOpenMPRuntime::OpenMPLocationFlags>(
CGOpenMPRuntime::OMP_IDENT_KMPC |
CGOpenMPRuntime::OMP_IDENT_BARRIER_IMPL);
CGF.CGM.getOpenMPRuntime().EmitOMPBarrierCall(CGF, Directive.getLocStart(),
Flags);
}
CGCapturedStmtInfo::EmitBody(CGF, S);
}
CGOpenMPRuntime::CGOpenMPRuntime(CodeGenModule &CGM)
: CGM(CGM), DefaultOpenMPPSource(nullptr) {
IdentTy = llvm::StructType::create(
"ident_t", CGM.Int32Ty /* reserved_1 */, CGM.Int32Ty /* flags */,
CGM.Int32Ty /* reserved_2 */, CGM.Int32Ty /* reserved_3 */,
CGM.Int8PtrTy /* psource */, nullptr);
// Build void (*kmpc_micro)(kmp_int32 *global_tid, kmp_int32 *bound_tid,...)
llvm::Type *MicroParams[] = {llvm::PointerType::getUnqual(CGM.Int32Ty),
llvm::PointerType::getUnqual(CGM.Int32Ty)};
Kmpc_MicroTy = llvm::FunctionType::get(CGM.VoidTy, MicroParams, true);
KmpCriticalNameTy = llvm::ArrayType::get(CGM.Int32Ty, /*NumElements*/ 8);
}
llvm::Value *
CGOpenMPRuntime::EmitOpenMPOutlinedFunction(const OMPExecutableDirective &D,
const VarDecl *ThreadIDVar) {
const CapturedStmt *CS = cast<CapturedStmt>(D.getAssociatedStmt());
CodeGenFunction CGF(CGM, true);
CGOpenMPRegionInfo CGInfo(D, *CS, ThreadIDVar);
CGF.CapturedStmtInfo = &CGInfo;
return CGF.GenerateCapturedStmtFunction(*CS);
}
llvm::Value *
CGOpenMPRuntime::GetOrCreateDefaultOpenMPLocation(OpenMPLocationFlags Flags) {
llvm::Value *Entry = OpenMPDefaultLocMap.lookup(Flags);
if (!Entry) {
if (!DefaultOpenMPPSource) {
// Initialize default location for psource field of ident_t structure of
// all ident_t objects. Format is ";file;function;line;column;;".
// Taken from
// http://llvm.org/svn/llvm-project/openmp/trunk/runtime/src/kmp_str.c
DefaultOpenMPPSource =
CGM.GetAddrOfConstantCString(";unknown;unknown;0;0;;");
DefaultOpenMPPSource =
llvm::ConstantExpr::getBitCast(DefaultOpenMPPSource, CGM.Int8PtrTy);
}
auto DefaultOpenMPLocation = new llvm::GlobalVariable(
CGM.getModule(), IdentTy, /*isConstant*/ true,
llvm::GlobalValue::PrivateLinkage, /*Initializer*/ nullptr);
DefaultOpenMPLocation->setUnnamedAddr(true);
llvm::Constant *Zero = llvm::ConstantInt::get(CGM.Int32Ty, 0, true);
llvm::Constant *Values[] = {Zero,
llvm::ConstantInt::get(CGM.Int32Ty, Flags),
Zero, Zero, DefaultOpenMPPSource};
llvm::Constant *Init = llvm::ConstantStruct::get(IdentTy, Values);
DefaultOpenMPLocation->setInitializer(Init);
OpenMPDefaultLocMap[Flags] = DefaultOpenMPLocation;
return DefaultOpenMPLocation;
}
return Entry;
}
llvm::Value *CGOpenMPRuntime::EmitOpenMPUpdateLocation(
CodeGenFunction &CGF, SourceLocation Loc, OpenMPLocationFlags Flags) {
// If no debug info is generated - return global default location.
if (CGM.getCodeGenOpts().getDebugInfo() == CodeGenOptions::NoDebugInfo ||
Loc.isInvalid())
return GetOrCreateDefaultOpenMPLocation(Flags);
assert(CGF.CurFn && "No function in current CodeGenFunction.");
llvm::Value *LocValue = nullptr;
auto I = OpenMPLocThreadIDMap.find(CGF.CurFn);
if (I != OpenMPLocThreadIDMap.end())
LocValue = I->second.DebugLoc;
else {
// Generate "ident_t .kmpc_loc.addr;"
llvm::AllocaInst *AI = CGF.CreateTempAlloca(IdentTy, ".kmpc_loc.addr");
AI->setAlignment(CGM.getDataLayout().getPrefTypeAlignment(IdentTy));
auto &Elem = OpenMPLocThreadIDMap.FindAndConstruct(CGF.CurFn);
Elem.second.DebugLoc = AI;
LocValue = AI;
CGBuilderTy::InsertPointGuard IPG(CGF.Builder);
CGF.Builder.SetInsertPoint(CGF.AllocaInsertPt);
CGF.Builder.CreateMemCpy(LocValue, GetOrCreateDefaultOpenMPLocation(Flags),
llvm::ConstantExpr::getSizeOf(IdentTy),
CGM.PointerAlignInBytes);
}
// char **psource = &.kmpc_loc_<flags>.addr.psource;
auto *PSource =
CGF.Builder.CreateConstInBoundsGEP2_32(LocValue, 0, IdentField_PSource);
auto OMPDebugLoc = OpenMPDebugLocMap.lookup(Loc.getRawEncoding());
if (OMPDebugLoc == nullptr) {
SmallString<128> Buffer2;
llvm::raw_svector_ostream OS2(Buffer2);
// Build debug location
PresumedLoc PLoc = CGF.getContext().getSourceManager().getPresumedLoc(Loc);
OS2 << ";" << PLoc.getFilename() << ";";
if (const FunctionDecl *FD =
dyn_cast_or_null<FunctionDecl>(CGF.CurFuncDecl)) {
OS2 << FD->getQualifiedNameAsString();
}
OS2 << ";" << PLoc.getLine() << ";" << PLoc.getColumn() << ";;";
OMPDebugLoc = CGF.Builder.CreateGlobalStringPtr(OS2.str());
OpenMPDebugLocMap[Loc.getRawEncoding()] = OMPDebugLoc;
}
// *psource = ";<File>;<Function>;<Line>;<Column>;;";
CGF.Builder.CreateStore(OMPDebugLoc, PSource);
return LocValue;
}
llvm::Value *CGOpenMPRuntime::GetOpenMPThreadID(CodeGenFunction &CGF,
SourceLocation Loc) {
assert(CGF.CurFn && "No function in current CodeGenFunction.");
llvm::Value *ThreadID = nullptr;
// Check whether we've already cached a load of the thread id in this
// function.
auto I = OpenMPLocThreadIDMap.find(CGF.CurFn);
if (I != OpenMPLocThreadIDMap.end()) {
ThreadID = I->second.ThreadID;
if (ThreadID != nullptr)
return ThreadID;
}
if (auto OMPRegionInfo =
dyn_cast_or_null<CGOpenMPRegionInfo>(CGF.CapturedStmtInfo)) {
// Check if this an outlined function with thread id passed as argument.
auto ThreadIDVar = OMPRegionInfo->getThreadIDVariable();
auto LVal = OMPRegionInfo->getThreadIDVariableLValue(CGF);
auto RVal = CGF.EmitLoadOfLValue(LVal, Loc);
LVal = CGF.MakeNaturalAlignAddrLValue(RVal.getScalarVal(),
ThreadIDVar->getType());
ThreadID = CGF.EmitLoadOfLValue(LVal, Loc).getScalarVal();
// If value loaded in entry block, cache it and use it everywhere in
// function.
if (CGF.Builder.GetInsertBlock() == CGF.AllocaInsertPt->getParent()) {
auto &Elem = OpenMPLocThreadIDMap.FindAndConstruct(CGF.CurFn);
Elem.second.ThreadID = ThreadID;
}
} else {
// This is not an outlined function region - need to call __kmpc_int32
// kmpc_global_thread_num(ident_t *loc).
// Generate thread id value and cache this value for use across the
// function.
CGBuilderTy::InsertPointGuard IPG(CGF.Builder);
CGF.Builder.SetInsertPoint(CGF.AllocaInsertPt);
llvm::Value *Args[] = {EmitOpenMPUpdateLocation(CGF, Loc)};
ThreadID = CGF.EmitRuntimeCall(
CreateRuntimeFunction(OMPRTL__kmpc_global_thread_num), Args);
auto &Elem = OpenMPLocThreadIDMap.FindAndConstruct(CGF.CurFn);
Elem.second.ThreadID = ThreadID;
}
return ThreadID;
}
void CGOpenMPRuntime::FunctionFinished(CodeGenFunction &CGF) {
assert(CGF.CurFn && "No function in current CodeGenFunction.");
if (OpenMPLocThreadIDMap.count(CGF.CurFn))
OpenMPLocThreadIDMap.erase(CGF.CurFn);
}
llvm::Type *CGOpenMPRuntime::getIdentTyPointerTy() {
return llvm::PointerType::getUnqual(IdentTy);
}
llvm::Type *CGOpenMPRuntime::getKmpc_MicroPointerTy() {
return llvm::PointerType::getUnqual(Kmpc_MicroTy);
}
llvm::Constant *
CGOpenMPRuntime::CreateRuntimeFunction(OpenMPRTLFunction Function) {
llvm::Constant *RTLFn = nullptr;
switch (Function) {
case OMPRTL__kmpc_fork_call: {
// Build void __kmpc_fork_call(ident_t *loc, kmp_int32 argc, kmpc_micro
// microtask, ...);
llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty,
getKmpc_MicroPointerTy()};
llvm::FunctionType *FnTy =
llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ true);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_fork_call");
break;
}
case OMPRTL__kmpc_global_thread_num: {
// Build kmp_int32 __kmpc_global_thread_num(ident_t *loc);
llvm::Type *TypeParams[] = {getIdentTyPointerTy()};
llvm::FunctionType *FnTy =
llvm::FunctionType::get(CGM.Int32Ty, TypeParams, /*isVarArg*/ false);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_global_thread_num");
break;
}
case OMPRTL__kmpc_threadprivate_cached: {
// Build void *__kmpc_threadprivate_cached(ident_t *loc,
// kmp_int32 global_tid, void *data, size_t size, void ***cache);
llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty,
CGM.VoidPtrTy, CGM.SizeTy,
CGM.VoidPtrTy->getPointerTo()->getPointerTo()};
llvm::FunctionType *FnTy =
llvm::FunctionType::get(CGM.VoidPtrTy, TypeParams, /*isVarArg*/ false);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_threadprivate_cached");
break;
}
case OMPRTL__kmpc_critical: {
// Build void __kmpc_critical(ident_t *loc, kmp_int32 global_tid,
// kmp_critical_name *crit);
llvm::Type *TypeParams[] = {
getIdentTyPointerTy(), CGM.Int32Ty,
llvm::PointerType::getUnqual(KmpCriticalNameTy)};
llvm::FunctionType *FnTy =
llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_critical");
break;
}
case OMPRTL__kmpc_threadprivate_register: {
// Build void __kmpc_threadprivate_register(ident_t *, void *data,
// kmpc_ctor ctor, kmpc_cctor cctor, kmpc_dtor dtor);
// typedef void *(*kmpc_ctor)(void *);
auto KmpcCtorTy =
llvm::FunctionType::get(CGM.VoidPtrTy, CGM.VoidPtrTy,
/*isVarArg*/ false)->getPointerTo();
// typedef void *(*kmpc_cctor)(void *, void *);
llvm::Type *KmpcCopyCtorTyArgs[] = {CGM.VoidPtrTy, CGM.VoidPtrTy};
auto KmpcCopyCtorTy =
llvm::FunctionType::get(CGM.VoidPtrTy, KmpcCopyCtorTyArgs,
/*isVarArg*/ false)->getPointerTo();
// typedef void (*kmpc_dtor)(void *);
auto KmpcDtorTy =
llvm::FunctionType::get(CGM.VoidTy, CGM.VoidPtrTy, /*isVarArg*/ false)
->getPointerTo();
llvm::Type *FnTyArgs[] = {getIdentTyPointerTy(), CGM.VoidPtrTy, KmpcCtorTy,
KmpcCopyCtorTy, KmpcDtorTy};
auto FnTy = llvm::FunctionType::get(CGM.VoidTy, FnTyArgs,
/*isVarArg*/ false);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_threadprivate_register");
break;
}
case OMPRTL__kmpc_end_critical: {
// Build void __kmpc_end_critical(ident_t *loc, kmp_int32 global_tid,
// kmp_critical_name *crit);
llvm::Type *TypeParams[] = {
getIdentTyPointerTy(), CGM.Int32Ty,
llvm::PointerType::getUnqual(KmpCriticalNameTy)};
llvm::FunctionType *FnTy =
llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_end_critical");
break;
}
case OMPRTL__kmpc_barrier: {
// Build void __kmpc_barrier(ident_t *loc, kmp_int32 global_tid);
llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty};
llvm::FunctionType *FnTy =
llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
RTLFn = CGM.CreateRuntimeFunction(FnTy, /*Name*/ "__kmpc_barrier");
break;
}
case OMPRTL__kmpc_push_num_threads: {
// Build void __kmpc_push_num_threads(ident_t *loc, kmp_int32 global_tid,
// kmp_int32 num_threads)
llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty,
CGM.Int32Ty};
llvm::FunctionType *FnTy =
llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_push_num_threads");
break;
}
case OMPRTL__kmpc_serialized_parallel: {
// Build void __kmpc_serialized_parallel(ident_t *loc, kmp_int32
// global_tid);
llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty};
llvm::FunctionType *FnTy =
llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_serialized_parallel");
break;
}
case OMPRTL__kmpc_end_serialized_parallel: {
// Build void __kmpc_end_serialized_parallel(ident_t *loc, kmp_int32
// global_tid);
llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty};
llvm::FunctionType *FnTy =
llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_end_serialized_parallel");
break;
}
case OMPRTL__kmpc_flush: {
// Build void __kmpc_flush(ident_t *loc, ...);
llvm::Type *TypeParams[] = {getIdentTyPointerTy()};
llvm::FunctionType *FnTy =
llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ true);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_flush");
break;
}
}
return RTLFn;
}
llvm::Constant *
CGOpenMPRuntime::getOrCreateThreadPrivateCache(const VarDecl *VD) {
// Lookup the entry, lazily creating it if necessary.
return GetOrCreateInternalVariable(CGM.Int8PtrPtrTy,
Twine(CGM.getMangledName(VD)) + ".cache.");
}
llvm::Value *CGOpenMPRuntime::getOMPAddrOfThreadPrivate(CodeGenFunction &CGF,
const VarDecl *VD,
llvm::Value *VDAddr,
SourceLocation Loc) {
auto VarTy = VDAddr->getType()->getPointerElementType();
llvm::Value *Args[] = {EmitOpenMPUpdateLocation(CGF, Loc),
GetOpenMPThreadID(CGF, Loc),
CGF.Builder.CreatePointerCast(VDAddr, CGM.Int8PtrTy),
CGM.getSize(CGM.GetTargetTypeStoreSize(VarTy)),
getOrCreateThreadPrivateCache(VD)};
return CGF.EmitRuntimeCall(
CreateRuntimeFunction(OMPRTL__kmpc_threadprivate_cached), Args);
}
void CGOpenMPRuntime::EmitOMPThreadPrivateVarInit(
CodeGenFunction &CGF, llvm::Value *VDAddr, llvm::Value *Ctor,
llvm::Value *CopyCtor, llvm::Value *Dtor, SourceLocation Loc) {
// Call kmp_int32 __kmpc_global_thread_num(&loc) to init OpenMP runtime
// library.
auto OMPLoc = EmitOpenMPUpdateLocation(CGF, Loc);
CGF.EmitRuntimeCall(CreateRuntimeFunction(OMPRTL__kmpc_global_thread_num),
OMPLoc);
// Call __kmpc_threadprivate_register(&loc, &var, ctor, cctor/*NULL*/, dtor)
// to register constructor/destructor for variable.
llvm::Value *Args[] = {OMPLoc,
CGF.Builder.CreatePointerCast(VDAddr, CGM.VoidPtrTy),
Ctor, CopyCtor, Dtor};
CGF.EmitRuntimeCall(
CreateRuntimeFunction(OMPRTL__kmpc_threadprivate_register), Args);
}
llvm::Function *CGOpenMPRuntime::EmitOMPThreadPrivateVarDefinition(
const VarDecl *VD, llvm::Value *VDAddr, SourceLocation Loc,
bool PerformInit, CodeGenFunction *CGF) {
VD = VD->getDefinition(CGM.getContext());
if (VD && ThreadPrivateWithDefinition.count(VD) == 0) {
ThreadPrivateWithDefinition.insert(VD);
QualType ASTTy = VD->getType();
llvm::Value *Ctor = nullptr, *CopyCtor = nullptr, *Dtor = nullptr;
auto Init = VD->getAnyInitializer();
if (CGM.getLangOpts().CPlusPlus && PerformInit) {
// Generate function that re-emits the declaration's initializer into the
// threadprivate copy of the variable VD
CodeGenFunction CtorCGF(CGM);
FunctionArgList Args;
ImplicitParamDecl Dst(CGM.getContext(), /*DC=*/nullptr, SourceLocation(),
/*Id=*/nullptr, CGM.getContext().VoidPtrTy);
Args.push_back(&Dst);
auto &FI = CGM.getTypes().arrangeFreeFunctionDeclaration(
CGM.getContext().VoidPtrTy, Args, FunctionType::ExtInfo(),
/*isVariadic=*/false);
auto FTy = CGM.getTypes().GetFunctionType(FI);
auto Fn = CGM.CreateGlobalInitOrDestructFunction(
FTy, ".__kmpc_global_ctor_.", Loc);
CtorCGF.StartFunction(GlobalDecl(), CGM.getContext().VoidPtrTy, Fn, FI,
Args, SourceLocation());
auto ArgVal = CtorCGF.EmitLoadOfScalar(
CtorCGF.GetAddrOfLocalVar(&Dst),
/*Volatile=*/false, CGM.PointerAlignInBytes,
CGM.getContext().VoidPtrTy, Dst.getLocation());
auto Arg = CtorCGF.Builder.CreatePointerCast(
ArgVal,
CtorCGF.ConvertTypeForMem(CGM.getContext().getPointerType(ASTTy)));
CtorCGF.EmitAnyExprToMem(Init, Arg, Init->getType().getQualifiers(),
/*IsInitializer=*/true);
ArgVal = CtorCGF.EmitLoadOfScalar(
CtorCGF.GetAddrOfLocalVar(&Dst),
/*Volatile=*/false, CGM.PointerAlignInBytes,
CGM.getContext().VoidPtrTy, Dst.getLocation());
CtorCGF.Builder.CreateStore(ArgVal, CtorCGF.ReturnValue);
CtorCGF.FinishFunction();
Ctor = Fn;
}
if (VD->getType().isDestructedType() != QualType::DK_none) {
// Generate function that emits destructor call for the threadprivate copy
// of the variable VD
CodeGenFunction DtorCGF(CGM);
FunctionArgList Args;
ImplicitParamDecl Dst(CGM.getContext(), /*DC=*/nullptr, SourceLocation(),
/*Id=*/nullptr, CGM.getContext().VoidPtrTy);
Args.push_back(&Dst);
auto &FI = CGM.getTypes().arrangeFreeFunctionDeclaration(
CGM.getContext().VoidTy, Args, FunctionType::ExtInfo(),
/*isVariadic=*/false);
auto FTy = CGM.getTypes().GetFunctionType(FI);
auto Fn = CGM.CreateGlobalInitOrDestructFunction(
FTy, ".__kmpc_global_dtor_.", Loc);
DtorCGF.StartFunction(GlobalDecl(), CGM.getContext().VoidTy, Fn, FI, Args,
SourceLocation());
auto ArgVal = DtorCGF.EmitLoadOfScalar(
DtorCGF.GetAddrOfLocalVar(&Dst),
/*Volatile=*/false, CGM.PointerAlignInBytes,
CGM.getContext().VoidPtrTy, Dst.getLocation());
DtorCGF.emitDestroy(ArgVal, ASTTy,
DtorCGF.getDestroyer(ASTTy.isDestructedType()),
DtorCGF.needsEHCleanup(ASTTy.isDestructedType()));
DtorCGF.FinishFunction();
Dtor = Fn;
}
// Do not emit init function if it is not required.
if (!Ctor && !Dtor)
return nullptr;
llvm::Type *CopyCtorTyArgs[] = {CGM.VoidPtrTy, CGM.VoidPtrTy};
auto CopyCtorTy =
llvm::FunctionType::get(CGM.VoidPtrTy, CopyCtorTyArgs,
/*isVarArg=*/false)->getPointerTo();
// Copying constructor for the threadprivate variable.
// Must be NULL - reserved by runtime, but currently it requires that this
// parameter is always NULL. Otherwise it fires assertion.
CopyCtor = llvm::Constant::getNullValue(CopyCtorTy);
if (Ctor == nullptr) {
auto CtorTy = llvm::FunctionType::get(CGM.VoidPtrTy, CGM.VoidPtrTy,
/*isVarArg=*/false)->getPointerTo();
Ctor = llvm::Constant::getNullValue(CtorTy);
}
if (Dtor == nullptr) {
auto DtorTy = llvm::FunctionType::get(CGM.VoidTy, CGM.VoidPtrTy,
/*isVarArg=*/false)->getPointerTo();
Dtor = llvm::Constant::getNullValue(DtorTy);
}
if (!CGF) {
auto InitFunctionTy =
llvm::FunctionType::get(CGM.VoidTy, /*isVarArg*/ false);
auto InitFunction = CGM.CreateGlobalInitOrDestructFunction(
InitFunctionTy, ".__omp_threadprivate_init_.");
CodeGenFunction InitCGF(CGM);
FunctionArgList ArgList;
InitCGF.StartFunction(GlobalDecl(), CGM.getContext().VoidTy, InitFunction,
CGM.getTypes().arrangeNullaryFunction(), ArgList,
Loc);
EmitOMPThreadPrivateVarInit(InitCGF, VDAddr, Ctor, CopyCtor, Dtor, Loc);
InitCGF.FinishFunction();
return InitFunction;
}
EmitOMPThreadPrivateVarInit(*CGF, VDAddr, Ctor, CopyCtor, Dtor, Loc);
}
return nullptr;
}
void CGOpenMPRuntime::EmitOMPParallelCall(CodeGenFunction &CGF,
SourceLocation Loc,
llvm::Value *OutlinedFn,
llvm::Value *CapturedStruct) {
// Build call __kmpc_fork_call(loc, 1, microtask, captured_struct/*context*/)
llvm::Value *Args[] = {
EmitOpenMPUpdateLocation(CGF, Loc),
CGF.Builder.getInt32(1), // Number of arguments after 'microtask' argument
// (there is only one additional argument - 'context')
CGF.Builder.CreateBitCast(OutlinedFn, getKmpc_MicroPointerTy()),
CGF.EmitCastToVoidPtr(CapturedStruct)};
auto RTLFn = CreateRuntimeFunction(OMPRTL__kmpc_fork_call);
CGF.EmitRuntimeCall(RTLFn, Args);
}
void CGOpenMPRuntime::EmitOMPSerialCall(CodeGenFunction &CGF,
SourceLocation Loc,
llvm::Value *OutlinedFn,
llvm::Value *CapturedStruct) {
auto ThreadID = GetOpenMPThreadID(CGF, Loc);
// Build calls:
// __kmpc_serialized_parallel(&Loc, GTid);
llvm::Value *SerArgs[] = {EmitOpenMPUpdateLocation(CGF, Loc), ThreadID};
auto RTLFn = CreateRuntimeFunction(OMPRTL__kmpc_serialized_parallel);
CGF.EmitRuntimeCall(RTLFn, SerArgs);
// OutlinedFn(&GTid, &zero, CapturedStruct);
auto ThreadIDAddr = EmitThreadIDAddress(CGF, Loc);
auto Int32Ty =
CGF.getContext().getIntTypeForBitwidth(/*DestWidth*/ 32, /*Signed*/ true);
auto ZeroAddr = CGF.CreateMemTemp(Int32Ty, /*Name*/ ".zero.addr");
CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0));
llvm::Value *OutlinedFnArgs[] = {ThreadIDAddr, ZeroAddr, CapturedStruct};
CGF.EmitCallOrInvoke(OutlinedFn, OutlinedFnArgs);
// __kmpc_end_serialized_parallel(&Loc, GTid);
llvm::Value *EndSerArgs[] = {EmitOpenMPUpdateLocation(CGF, Loc), ThreadID};
RTLFn = CreateRuntimeFunction(OMPRTL__kmpc_end_serialized_parallel);
CGF.EmitRuntimeCall(RTLFn, EndSerArgs);
}
// If we're inside an (outlined) parallel region, use the region info's
// thread-ID variable (it is passed in a first argument of the outlined function
// as "kmp_int32 *gtid"). Otherwise, if we're not inside parallel region, but in
// regular serial code region, get thread ID by calling kmp_int32
// kmpc_global_thread_num(ident_t *loc), stash this thread ID in a temporary and
// return the address of that temp.
llvm::Value *CGOpenMPRuntime::EmitThreadIDAddress(CodeGenFunction &CGF,
SourceLocation Loc) {
if (auto OMPRegionInfo =
dyn_cast_or_null<CGOpenMPRegionInfo>(CGF.CapturedStmtInfo))
return CGF.EmitLoadOfLValue(OMPRegionInfo->getThreadIDVariableLValue(CGF),
SourceLocation()).getScalarVal();
auto ThreadID = GetOpenMPThreadID(CGF, Loc);
auto Int32Ty =
CGF.getContext().getIntTypeForBitwidth(/*DestWidth*/ 32, /*Signed*/ true);
auto ThreadIDTemp = CGF.CreateMemTemp(Int32Ty, /*Name*/ ".threadid_temp.");
CGF.EmitStoreOfScalar(ThreadID,
CGF.MakeNaturalAlignAddrLValue(ThreadIDTemp, Int32Ty));
return ThreadIDTemp;
}
llvm::Constant *
CGOpenMPRuntime::GetOrCreateInternalVariable(llvm::Type *Ty,
const llvm::Twine &Name) {
SmallString<256> Buffer;
llvm::raw_svector_ostream Out(Buffer);
Out << Name;
auto RuntimeName = Out.str();
auto &Elem = *InternalVars.insert(std::make_pair(RuntimeName, nullptr)).first;
if (Elem.second) {
assert(Elem.second->getType()->getPointerElementType() == Ty &&
"OMP internal variable has different type than requested");
return &*Elem.second;
}
return Elem.second = new llvm::GlobalVariable(
CGM.getModule(), Ty, /*IsConstant*/ false,
llvm::GlobalValue::CommonLinkage, llvm::Constant::getNullValue(Ty),
Elem.first());
}
llvm::Value *CGOpenMPRuntime::GetCriticalRegionLock(StringRef CriticalName) {
llvm::Twine Name(".gomp_critical_user_", CriticalName);
return GetOrCreateInternalVariable(KmpCriticalNameTy, Name.concat(".var"));
}
void CGOpenMPRuntime::EmitOMPCriticalRegion(
CodeGenFunction &CGF, StringRef CriticalName,
const std::function<void()> &CriticalOpGen, SourceLocation Loc) {
auto RegionLock = GetCriticalRegionLock(CriticalName);
// __kmpc_critical(ident_t *, gtid, Lock);
// CriticalOpGen();
// __kmpc_end_critical(ident_t *, gtid, Lock);
// Prepare arguments and build a call to __kmpc_critical
llvm::Value *Args[] = {EmitOpenMPUpdateLocation(CGF, Loc),
GetOpenMPThreadID(CGF, Loc), RegionLock};
auto RTLFn = CreateRuntimeFunction(OMPRTL__kmpc_critical);
CGF.EmitRuntimeCall(RTLFn, Args);
CriticalOpGen();
// Build a call to __kmpc_end_critical
RTLFn = CreateRuntimeFunction(OMPRTL__kmpc_end_critical);
CGF.EmitRuntimeCall(RTLFn, Args);
}
void CGOpenMPRuntime::EmitOMPBarrierCall(CodeGenFunction &CGF,
SourceLocation Loc,
OpenMPLocationFlags Flags) {
// Build call __kmpc_barrier(loc, thread_id)
llvm::Value *Args[] = {EmitOpenMPUpdateLocation(CGF, Loc, Flags),
GetOpenMPThreadID(CGF, Loc)};
auto RTLFn = CreateRuntimeFunction(OMPRTL__kmpc_barrier);
CGF.EmitRuntimeCall(RTLFn, Args);
}
void CGOpenMPRuntime::EmitOMPNumThreadsClause(CodeGenFunction &CGF,
llvm::Value *NumThreads,
SourceLocation Loc) {
// Build call __kmpc_push_num_threads(&loc, global_tid, num_threads)
llvm::Value *Args[] = {
EmitOpenMPUpdateLocation(CGF, Loc), GetOpenMPThreadID(CGF, Loc),
CGF.Builder.CreateIntCast(NumThreads, CGF.Int32Ty, /*isSigned*/ true)};
llvm::Constant *RTLFn = CreateRuntimeFunction(OMPRTL__kmpc_push_num_threads);
CGF.EmitRuntimeCall(RTLFn, Args);
}
void CGOpenMPRuntime::EmitOMPFlush(CodeGenFunction &CGF, ArrayRef<const Expr *>,
SourceLocation Loc) {
// Build call void __kmpc_flush(ident_t *loc, ...)
// FIXME: List of variables is ignored by libiomp5 runtime, no need to
// generate it, just request full memory fence.
llvm::Value *Args[] = {EmitOpenMPUpdateLocation(CGF, Loc),
llvm::ConstantInt::get(CGM.Int32Ty, 0)};
auto *RTLFn = CreateRuntimeFunction(OMPRTL__kmpc_flush);
CGF.EmitRuntimeCall(RTLFn, Args);
}
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