contrib/llvm/tools/clang/lib/CodeGen/CGOpenCLRuntime.cpp

   1 //===----- CGOpenCLRuntime.cpp - Interface to OpenCL Runtimes -------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This provides an abstract class for OpenCL code generation.  Concrete
  11 // subclasses of this implement code generation for specific OpenCL
  12 // runtime libraries.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #include "CGOpenCLRuntime.h"
  17 #include "CodeGenFunction.h"
  18 #include "TargetInfo.h"
  19 #include "clang/CodeGen/ConstantInitBuilder.h"
  20 #include "llvm/IR/DerivedTypes.h"
  21 #include "llvm/IR/GlobalValue.h"
  22 #include <assert.h>
  23
  24 using namespace clang;
  25 using namespace CodeGen;
  26
  27 CGOpenCLRuntime::~CGOpenCLRuntime() {}
  28
  29 void CGOpenCLRuntime::EmitWorkGroupLocalVarDecl(CodeGenFunction &CGF,
  30                                                 const VarDecl &D) {
  31   return CGF.EmitStaticVarDecl(D, llvm::GlobalValue::InternalLinkage);
  32 }
  33
  34 llvm::Type *CGOpenCLRuntime::convertOpenCLSpecificType(const Type *T) {
  35   assert(T->isOpenCLSpecificType() &&
  36          "Not an OpenCL specific type!");
  37
  38   llvm::LLVMContext& Ctx = CGM.getLLVMContext();
  39   uint32_t AddrSpc = CGM.getContext().getTargetAddressSpace(
  40       CGM.getContext().getOpenCLTypeAddrSpace(T));
  41   switch (cast<BuiltinType>(T)->getKind()) {
  42   default:
  43     llvm_unreachable("Unexpected opencl builtin type!");
  44     return nullptr;
  45 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
  46   case BuiltinType::Id: \
  47     return llvm::PointerType::get( \
  48         llvm::StructType::create(Ctx, "opencl." #ImgType "_" #Suffix "_t"), \
  49         AddrSpc);
  50 #include "clang/Basic/OpenCLImageTypes.def"
  51   case BuiltinType::OCLSampler:
  52     return getSamplerType(T);
  53   case BuiltinType::OCLEvent:
  54     return llvm::PointerType::get(
  55         llvm::StructType::create(Ctx, "opencl.event_t"), AddrSpc);
  56   case BuiltinType::OCLClkEvent:
  57     return llvm::PointerType::get(
  58         llvm::StructType::create(Ctx, "opencl.clk_event_t"), AddrSpc);
  59   case BuiltinType::OCLQueue:
  60     return llvm::PointerType::get(
  61         llvm::StructType::create(Ctx, "opencl.queue_t"), AddrSpc);
  62   case BuiltinType::OCLReserveID:
  63     return llvm::PointerType::get(
  64         llvm::StructType::create(Ctx, "opencl.reserve_id_t"), AddrSpc);
  65 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
  66   case BuiltinType::Id: \
  67     return llvm::PointerType::get( \
  68         llvm::StructType::create(Ctx, "opencl." #ExtType), AddrSpc);
  69 #include "clang/Basic/OpenCLExtensionTypes.def"
  70   }
  71 }
  72
  73 llvm::Type *CGOpenCLRuntime::getPipeType(const PipeType *T) {
  74   if (T->isReadOnly())
  75     return getPipeType(T, "opencl.pipe_ro_t", PipeROTy);
  76   else
  77     return getPipeType(T, "opencl.pipe_wo_t", PipeWOTy);
  78 }
  79
  80 llvm::Type *CGOpenCLRuntime::getPipeType(const PipeType *T, StringRef Name,
  81                                          llvm::Type *&PipeTy) {
  82   if (!PipeTy)
  83     PipeTy = llvm::PointerType::get(llvm::StructType::create(
  84       CGM.getLLVMContext(), Name),
  85       CGM.getContext().getTargetAddressSpace(
  86           CGM.getContext().getOpenCLTypeAddrSpace(T)));
  87   return PipeTy;
  88 }
  89
  90 llvm::PointerType *CGOpenCLRuntime::getSamplerType(const Type *T) {
  91   if (!SamplerTy)
  92     SamplerTy = llvm::PointerType::get(llvm::StructType::create(
  93       CGM.getLLVMContext(), "opencl.sampler_t"),
  94       CGM.getContext().getTargetAddressSpace(
  95           CGM.getContext().getOpenCLTypeAddrSpace(T)));
  96   return SamplerTy;
  97 }
  98
  99 llvm::Value *CGOpenCLRuntime::getPipeElemSize(const Expr *PipeArg) {
 100   const PipeType *PipeTy = PipeArg->getType()->getAs<PipeType>();
 101   // The type of the last (implicit) argument to be passed.
 102   llvm::Type *Int32Ty = llvm::IntegerType::getInt32Ty(CGM.getLLVMContext());
 103   unsigned TypeSize = CGM.getContext()
 104                           .getTypeSizeInChars(PipeTy->getElementType())
 105                           .getQuantity();
 106   return llvm::ConstantInt::get(Int32Ty, TypeSize, false);
 107 }
 108
 109 llvm::Value *CGOpenCLRuntime::getPipeElemAlign(const Expr *PipeArg) {
 110   const PipeType *PipeTy = PipeArg->getType()->getAs<PipeType>();
 111   // The type of the last (implicit) argument to be passed.
 112   llvm::Type *Int32Ty = llvm::IntegerType::getInt32Ty(CGM.getLLVMContext());
 113   unsigned TypeSize = CGM.getContext()
 114                           .getTypeAlignInChars(PipeTy->getElementType())
 115                           .getQuantity();
 116   return llvm::ConstantInt::get(Int32Ty, TypeSize, false);
 117 }
 118
 119 llvm::PointerType *CGOpenCLRuntime::getGenericVoidPointerType() {
 120   assert(CGM.getLangOpts().OpenCL);
 121   return llvm::IntegerType::getInt8PtrTy(
 122       CGM.getLLVMContext(),
 123       CGM.getContext().getTargetAddressSpace(LangAS::opencl_generic));
 124 }
 125
 126 /// Record emitted llvm invoke function and llvm block literal for the
 127 /// corresponding block expression.
 128 void CGOpenCLRuntime::recordBlockInfo(const BlockExpr *E,
 129                                       llvm::Function *InvokeF,
 130                                       llvm::Value *Block) {
 131   assert(EnqueuedBlockMap.find(E) == EnqueuedBlockMap.end() &&
 132          "Block expression emitted twice");
 133   assert(isa<llvm::Function>(InvokeF) && "Invalid invoke function");
 134   assert(Block->getType()->isPointerTy() && "Invalid block literal type");
 135   EnqueuedBlockMap[E].InvokeFunc = InvokeF;
 136   EnqueuedBlockMap[E].BlockArg = Block;
 137   EnqueuedBlockMap[E].Kernel = nullptr;
 138 }
 139
 140 CGOpenCLRuntime::EnqueuedBlockInfo
 141 CGOpenCLRuntime::emitOpenCLEnqueuedBlock(CodeGenFunction &CGF, const Expr *E) {
 142   CGF.EmitScalarExpr(E);
 143
 144   // The block literal may be assigned to a const variable. Chasing down
 145   // to get the block literal.
 146   if (auto DR = dyn_cast<DeclRefExpr>(E)) {
 147     E = cast<VarDecl>(DR->getDecl())->getInit();
 148   }
 149   E = E->IgnoreImplicit();
 150   if (auto Cast = dyn_cast<CastExpr>(E)) {
 151     E = Cast->getSubExpr();
 152   }
 153   auto *Block = cast<BlockExpr>(E);
 154
 155   assert(EnqueuedBlockMap.find(Block) != EnqueuedBlockMap.end() &&
 156          "Block expression not emitted");
 157
 158   // Do not emit the block wrapper again if it has been emitted.
 159   if (EnqueuedBlockMap[Block].Kernel) {
 160     return EnqueuedBlockMap[Block];
 161   }
 162
 163   auto *F = CGF.getTargetHooks().createEnqueuedBlockKernel(
 164       CGF, EnqueuedBlockMap[Block].InvokeFunc,
 165       EnqueuedBlockMap[Block].BlockArg->stripPointerCasts());
 166
 167   // The common part of the post-processing of the kernel goes here.
 168   F->addFnAttr(llvm::Attribute::NoUnwind);
 169   F->setCallingConv(
 170       CGF.getTypes().ClangCallConvToLLVMCallConv(CallingConv::CC_OpenCLKernel));
 171   EnqueuedBlockMap[Block].Kernel = F;
 172   return EnqueuedBlockMap[Block];
 173 }