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//===----- CGOpenCLRuntime.cpp - Interface to OpenCL Runtimes -------------===//
//
// 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 provides an abstract class for OpenCL code generation. Concrete
// subclasses of this implement code generation for specific OpenCL
// runtime libraries.
//
//===----------------------------------------------------------------------===//
#include "CGOpenCLRuntime.h"
#include "CodeGenFunction.h"
#include "TargetInfo.h"
#include "clang/CodeGen/ConstantInitBuilder.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/GlobalValue.h"
#include <assert.h>
using namespace clang;
using namespace CodeGen;
CGOpenCLRuntime::~CGOpenCLRuntime() {}
void CGOpenCLRuntime::EmitWorkGroupLocalVarDecl(CodeGenFunction &CGF,
const VarDecl &D) {
return CGF.EmitStaticVarDecl(D, llvm::GlobalValue::InternalLinkage);
}
llvm::Type *CGOpenCLRuntime::convertOpenCLSpecificType(const Type *T) {
assert(T->isOpenCLSpecificType() &&
"Not an OpenCL specific type!");
llvm::LLVMContext& Ctx = CGM.getLLVMContext();
uint32_t AddrSpc = CGM.getContext().getTargetAddressSpace(
CGM.getContext().getOpenCLTypeAddrSpace(T));
switch (cast<BuiltinType>(T)->getKind()) {
default:
llvm_unreachable("Unexpected opencl builtin type!");
return nullptr;
#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
case BuiltinType::Id: \
return llvm::PointerType::get( \
llvm::StructType::create(Ctx, "opencl." #ImgType "_" #Suffix "_t"), \
AddrSpc);
#include "clang/Basic/OpenCLImageTypes.def"
case BuiltinType::OCLSampler:
return getSamplerType(T);
case BuiltinType::OCLEvent:
return llvm::PointerType::get(
llvm::StructType::create(Ctx, "opencl.event_t"), AddrSpc);
case BuiltinType::OCLClkEvent:
return llvm::PointerType::get(
llvm::StructType::create(Ctx, "opencl.clk_event_t"), AddrSpc);
case BuiltinType::OCLQueue:
return llvm::PointerType::get(
llvm::StructType::create(Ctx, "opencl.queue_t"), AddrSpc);
case BuiltinType::OCLReserveID:
return llvm::PointerType::get(
llvm::StructType::create(Ctx, "opencl.reserve_id_t"), AddrSpc);
#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
case BuiltinType::Id: \
return llvm::PointerType::get( \
llvm::StructType::create(Ctx, "opencl." #ExtType), AddrSpc);
#include "clang/Basic/OpenCLExtensionTypes.def"
}
}
llvm::Type *CGOpenCLRuntime::getPipeType(const PipeType *T) {
if (T->isReadOnly())
return getPipeType(T, "opencl.pipe_ro_t", PipeROTy);
else
return getPipeType(T, "opencl.pipe_wo_t", PipeWOTy);
}
llvm::Type *CGOpenCLRuntime::getPipeType(const PipeType *T, StringRef Name,
llvm::Type *&PipeTy) {
if (!PipeTy)
PipeTy = llvm::PointerType::get(llvm::StructType::create(
CGM.getLLVMContext(), Name),
CGM.getContext().getTargetAddressSpace(
CGM.getContext().getOpenCLTypeAddrSpace(T)));
return PipeTy;
}
llvm::PointerType *CGOpenCLRuntime::getSamplerType(const Type *T) {
if (!SamplerTy)
SamplerTy = llvm::PointerType::get(llvm::StructType::create(
CGM.getLLVMContext(), "opencl.sampler_t"),
CGM.getContext().getTargetAddressSpace(
CGM.getContext().getOpenCLTypeAddrSpace(T)));
return SamplerTy;
}
llvm::Value *CGOpenCLRuntime::getPipeElemSize(const Expr *PipeArg) {
const PipeType *PipeTy = PipeArg->getType()->getAs<PipeType>();
// The type of the last (implicit) argument to be passed.
llvm::Type *Int32Ty = llvm::IntegerType::getInt32Ty(CGM.getLLVMContext());
unsigned TypeSize = CGM.getContext()
.getTypeSizeInChars(PipeTy->getElementType())
.getQuantity();
return llvm::ConstantInt::get(Int32Ty, TypeSize, false);
}
llvm::Value *CGOpenCLRuntime::getPipeElemAlign(const Expr *PipeArg) {
const PipeType *PipeTy = PipeArg->getType()->getAs<PipeType>();
// The type of the last (implicit) argument to be passed.
llvm::Type *Int32Ty = llvm::IntegerType::getInt32Ty(CGM.getLLVMContext());
unsigned TypeSize = CGM.getContext()
.getTypeAlignInChars(PipeTy->getElementType())
.getQuantity();
return llvm::ConstantInt::get(Int32Ty, TypeSize, false);
}
llvm::PointerType *CGOpenCLRuntime::getGenericVoidPointerType() {
assert(CGM.getLangOpts().OpenCL);
return llvm::IntegerType::getInt8PtrTy(
CGM.getLLVMContext(),
CGM.getContext().getTargetAddressSpace(LangAS::opencl_generic));
}
// Get the block literal from an expression derived from the block expression.
// OpenCL v2.0 s6.12.5:
// Block variable declarations are implicitly qualified with const. Therefore
// all block variables must be initialized at declaration time and may not be
// reassigned.
static const BlockExpr *getBlockExpr(const Expr *E) {
const Expr *Prev = nullptr; // to make sure we do not stuck in infinite loop.
while(!isa<BlockExpr>(E) && E != Prev) {
Prev = E;
E = E->IgnoreCasts();
if (auto DR = dyn_cast<DeclRefExpr>(E)) {
E = cast<VarDecl>(DR->getDecl())->getInit();
}
}
return cast<BlockExpr>(E);
}
/// Record emitted llvm invoke function and llvm block literal for the
/// corresponding block expression.
void CGOpenCLRuntime::recordBlockInfo(const BlockExpr *E,
llvm::Function *InvokeF,
llvm::Value *Block) {
assert(EnqueuedBlockMap.find(E) == EnqueuedBlockMap.end() &&
"Block expression emitted twice");
assert(isa<llvm::Function>(InvokeF) && "Invalid invoke function");
assert(Block->getType()->isPointerTy() && "Invalid block literal type");
EnqueuedBlockMap[E].InvokeFunc = InvokeF;
EnqueuedBlockMap[E].BlockArg = Block;
EnqueuedBlockMap[E].Kernel = nullptr;
}
llvm::Function *CGOpenCLRuntime::getInvokeFunction(const Expr *E) {
return EnqueuedBlockMap[getBlockExpr(E)].InvokeFunc;
}
CGOpenCLRuntime::EnqueuedBlockInfo
CGOpenCLRuntime::emitOpenCLEnqueuedBlock(CodeGenFunction &CGF, const Expr *E) {
CGF.EmitScalarExpr(E);
// The block literal may be assigned to a const variable. Chasing down
// to get the block literal.
const BlockExpr *Block = getBlockExpr(E);
assert(EnqueuedBlockMap.find(Block) != EnqueuedBlockMap.end() &&
"Block expression not emitted");
// Do not emit the block wrapper again if it has been emitted.
if (EnqueuedBlockMap[Block].Kernel) {
return EnqueuedBlockMap[Block];
}
auto *F = CGF.getTargetHooks().createEnqueuedBlockKernel(
CGF, EnqueuedBlockMap[Block].InvokeFunc,
EnqueuedBlockMap[Block].BlockArg->stripPointerCasts());
// The common part of the post-processing of the kernel goes here.
F->addFnAttr(llvm::Attribute::NoUnwind);
F->setCallingConv(
CGF.getTypes().ClangCallConvToLLVMCallConv(CallingConv::CC_OpenCLKernel));
EnqueuedBlockMap[Block].Kernel = F;
return EnqueuedBlockMap[Block];
}
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