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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/Decl.h"
#include "llvm/ADT/ArrayRef.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;
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 */, NULL);
// 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);
}
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);
}
llvm::GlobalVariable *DefaultOpenMPLocation = cast<llvm::GlobalVariable>(
CGM.CreateRuntimeVariable(IdentTy, ".kmpc_default_loc.addr"));
DefaultOpenMPLocation->setUnnamedAddr(true);
DefaultOpenMPLocation->setConstant(true);
DefaultOpenMPLocation->setLinkage(llvm::GlobalValue::PrivateLinkage);
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);
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;
OpenMPLocMapTy::iterator I = OpenMPLocMap.find(CGF.CurFn);
if (I != OpenMPLocMap.end()) {
LocValue = I->second;
} else {
// Generate "ident_t .kmpc_loc.addr;"
llvm::AllocaInst *AI = CGF.CreateTempAlloca(IdentTy, ".kmpc_loc.addr");
AI->setAlignment(CGM.getDataLayout().getPrefTypeAlignment(IdentTy));
OpenMPLocMap[CGF.CurFn] = 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;
llvm::Value *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::GetOpenMPGlobalThreadNum(CodeGenFunction &CGF,
SourceLocation Loc) {
assert(CGF.CurFn && "No function in current CodeGenFunction.");
llvm::Value *GTid = nullptr;
OpenMPGtidMapTy::iterator I = OpenMPGtidMap.find(CGF.CurFn);
if (I != OpenMPGtidMap.end()) {
GTid = I->second;
} else {
// Generate "int32 .kmpc_global_thread_num.addr;"
CGBuilderTy::InsertPointGuard IPG(CGF.Builder);
CGF.Builder.SetInsertPoint(CGF.AllocaInsertPt);
llvm::Value *Args[] = {EmitOpenMPUpdateLocation(CGF, Loc)};
GTid = CGF.EmitRuntimeCall(
CreateRuntimeFunction(OMPRTL__kmpc_global_thread_num), Args);
OpenMPGtidMap[CGF.CurFn] = GTid;
}
return GTid;
}
void CGOpenMPRuntime::FunctionFinished(CodeGenFunction &CGF) {
assert(CGF.CurFn && "No function in current CodeGenFunction.");
if (OpenMPGtidMap.count(CGF.CurFn))
OpenMPGtidMap.erase(CGF.CurFn);
if (OpenMPLocMap.count(CGF.CurFn))
OpenMPLocMap.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, 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, false);
RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_global_thread_num");
break;
}
}
return RTLFn;
}
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