Coverage Report

Created: 2020-09-19 12:23

/Users/buildslave/jenkins/workspace/coverage/llvm-project/clang/lib/CodeGen/CGOpenCLRuntime.cpp
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//===----- CGOpenCLRuntime.cpp - Interface to OpenCL Runtimes -------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This provides an abstract class for OpenCL code generation.  Concrete
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// subclasses of this implement code generation for specific OpenCL
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// runtime libraries.
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//
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//===----------------------------------------------------------------------===//
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#include "CGOpenCLRuntime.h"
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#include "CodeGenFunction.h"
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#include "TargetInfo.h"
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#include "clang/CodeGen/ConstantInitBuilder.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/GlobalValue.h"
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#include <assert.h>
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using namespace clang;
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using namespace CodeGen;
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CGOpenCLRuntime::~CGOpenCLRuntime() {}
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void CGOpenCLRuntime::EmitWorkGroupLocalVarDecl(CodeGenFunction &CGF,
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                                                const VarDecl &D) {
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  return CGF.EmitStaticVarDecl(D, llvm::GlobalValue::InternalLinkage);
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}
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llvm::Type *CGOpenCLRuntime::convertOpenCLSpecificType(const Type *T) {
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  assert(T->isOpenCLSpecificType() &&
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         "Not an OpenCL specific type!");
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  llvm::LLVMContext& Ctx = CGM.getLLVMContext();
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  uint32_t AddrSpc = CGM.getContext().getTargetAddressSpace(
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      CGM.getContext().getOpenCLTypeAddrSpace(T));
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  switch (cast<BuiltinType>(T)->getKind()) {
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  default:
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    llvm_unreachable("Unexpected opencl builtin type!");
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    return nullptr;
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#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
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  case BuiltinType::Id: \
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    return llvm::PointerType::get( \
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        llvm::StructType::create(Ctx, "opencl." #ImgType "_" #Suffix "_t"), \
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        AddrSpc);
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#include "clang/Basic/OpenCLImageTypes.def"
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  case BuiltinType::OCLSampler:
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    return getSamplerType(T);
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  case BuiltinType::OCLEvent:
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    return llvm::PointerType::get(
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        llvm::StructType::create(Ctx, "opencl.event_t"), AddrSpc);
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  case BuiltinType::OCLClkEvent:
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    return llvm::PointerType::get(
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        llvm::StructType::create(Ctx, "opencl.clk_event_t"), AddrSpc);
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  case BuiltinType::OCLQueue:
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    return llvm::PointerType::get(
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        llvm::StructType::create(Ctx, "opencl.queue_t"), AddrSpc);
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  case BuiltinType::OCLReserveID:
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    return llvm::PointerType::get(
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        llvm::StructType::create(Ctx, "opencl.reserve_id_t"), AddrSpc);
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#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
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  case BuiltinType::Id: \
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    return llvm::PointerType::get( \
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        llvm::StructType::create(Ctx, "opencl." #ExtType), AddrSpc);
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#include "clang/Basic/OpenCLExtensionTypes.def"
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  }
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}
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llvm::Type *CGOpenCLRuntime::getPipeType(const PipeType *T) {
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  if (T->isReadOnly())
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    return getPipeType(T, "opencl.pipe_ro_t", PipeROTy);
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  else
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    return getPipeType(T, "opencl.pipe_wo_t", PipeWOTy);
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}
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llvm::Type *CGOpenCLRuntime::getPipeType(const PipeType *T, StringRef Name,
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                                         llvm::Type *&PipeTy) {
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  if (!PipeTy)
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    PipeTy = llvm::PointerType::get(llvm::StructType::create(
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      CGM.getLLVMContext(), Name),
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      CGM.getContext().getTargetAddressSpace(
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          CGM.getContext().getOpenCLTypeAddrSpace(T)));
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  return PipeTy;
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}
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llvm::PointerType *CGOpenCLRuntime::getSamplerType(const Type *T) {
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  if (!SamplerTy)
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    SamplerTy = llvm::PointerType::get(llvm::StructType::create(
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      CGM.getLLVMContext(), "opencl.sampler_t"),
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      CGM.getContext().getTargetAddressSpace(
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          CGM.getContext().getOpenCLTypeAddrSpace(T)));
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  return SamplerTy;
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}
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llvm::Value *CGOpenCLRuntime::getPipeElemSize(const Expr *PipeArg) {
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  const PipeType *PipeTy = PipeArg->getType()->castAs<PipeType>();
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  // The type of the last (implicit) argument to be passed.
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  llvm::Type *Int32Ty = llvm::IntegerType::getInt32Ty(CGM.getLLVMContext());
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  unsigned TypeSize = CGM.getContext()
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                          .getTypeSizeInChars(PipeTy->getElementType())
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                          .getQuantity();
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  return llvm::ConstantInt::get(Int32Ty, TypeSize, false);
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}
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llvm::Value *CGOpenCLRuntime::getPipeElemAlign(const Expr *PipeArg) {
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  const PipeType *PipeTy = PipeArg->getType()->castAs<PipeType>();
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  // The type of the last (implicit) argument to be passed.
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  llvm::Type *Int32Ty = llvm::IntegerType::getInt32Ty(CGM.getLLVMContext());
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  unsigned TypeSize = CGM.getContext()
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                          .getTypeAlignInChars(PipeTy->getElementType())
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                          .getQuantity();
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  return llvm::ConstantInt::get(Int32Ty, TypeSize, false);
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}
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llvm::PointerType *CGOpenCLRuntime::getGenericVoidPointerType() {
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  assert(CGM.getLangOpts().OpenCL);
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  return llvm::IntegerType::getInt8PtrTy(
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      CGM.getLLVMContext(),
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      CGM.getContext().getTargetAddressSpace(LangAS::opencl_generic));
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}
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// Get the block literal from an expression derived from the block expression.
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// OpenCL v2.0 s6.12.5:
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// Block variable declarations are implicitly qualified with const. Therefore
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// all block variables must be initialized at declaration time and may not be
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// reassigned.
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static const BlockExpr *getBlockExpr(const Expr *E) {
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  const Expr *Prev = nullptr; // to make sure we do not stuck in infinite loop.
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  while(!isa<BlockExpr>(E) && 
E != Prev84
) {
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    Prev = E;
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    E = E->IgnoreCasts();
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    if (auto DR = dyn_cast<DeclRefExpr>(E)) {
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      E = cast<VarDecl>(DR->getDecl())->getInit();
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    }
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  }
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  return cast<BlockExpr>(E);
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}
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/// Record emitted llvm invoke function and llvm block literal for the
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/// corresponding block expression.
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void CGOpenCLRuntime::recordBlockInfo(const BlockExpr *E,
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                                      llvm::Function *InvokeF,
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                                      llvm::Value *Block) {
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  assert(EnqueuedBlockMap.find(E) == EnqueuedBlockMap.end() &&
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         "Block expression emitted twice");
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  assert(isa<llvm::Function>(InvokeF) && "Invalid invoke function");
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  assert(Block->getType()->isPointerTy() && "Invalid block literal type");
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  EnqueuedBlockMap[E].InvokeFunc = InvokeF;
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  EnqueuedBlockMap[E].BlockArg = Block;
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  EnqueuedBlockMap[E].Kernel = nullptr;
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}
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llvm::Function *CGOpenCLRuntime::getInvokeFunction(const Expr *E) {
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  return EnqueuedBlockMap[getBlockExpr(E)].InvokeFunc;
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}
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CGOpenCLRuntime::EnqueuedBlockInfo
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CGOpenCLRuntime::emitOpenCLEnqueuedBlock(CodeGenFunction &CGF, const Expr *E) {
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  CGF.EmitScalarExpr(E);
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  // The block literal may be assigned to a const variable. Chasing down
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  // to get the block literal.
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  const BlockExpr *Block = getBlockExpr(E);
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  assert(EnqueuedBlockMap.find(Block) != EnqueuedBlockMap.end() &&
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         "Block expression not emitted");
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  // Do not emit the block wrapper again if it has been emitted.
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  if (EnqueuedBlockMap[Block].Kernel) {
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    return EnqueuedBlockMap[Block];
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  }
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  auto *F = CGF.getTargetHooks().createEnqueuedBlockKernel(
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      CGF, EnqueuedBlockMap[Block].InvokeFunc,
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      EnqueuedBlockMap[Block].BlockArg->stripPointerCasts());
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  // The common part of the post-processing of the kernel goes here.
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  F->addFnAttr(llvm::Attribute::NoUnwind);
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  F->setCallingConv(
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      CGF.getTypes().ClangCallConvToLLVMCallConv(CallingConv::CC_OpenCLKernel));
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  EnqueuedBlockMap[Block].Kernel = F;
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  return EnqueuedBlockMap[Block];
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}