1 //===----- CGOpenCLRuntime.cpp - Interface to OpenCL Runtimes -------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This provides an abstract class for OpenCL code generation. Concrete
10 // subclasses of this implement code generation for specific OpenCL
11 // runtime libraries.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "CGOpenCLRuntime.h"
16 #include "CodeGenFunction.h"
17 #include "TargetInfo.h"
18 #include "clang/CodeGen/ConstantInitBuilder.h"
19 #include "llvm/IR/DerivedTypes.h"
20 #include "llvm/IR/GlobalValue.h"
21 #include <assert.h>
22
23 using namespace clang;
24 using namespace CodeGen;
25
~CGOpenCLRuntime()26 CGOpenCLRuntime::~CGOpenCLRuntime() {}
27
EmitWorkGroupLocalVarDecl(CodeGenFunction & CGF,const VarDecl & D)28 void CGOpenCLRuntime::EmitWorkGroupLocalVarDecl(CodeGenFunction &CGF,
29 const VarDecl &D) {
30 return CGF.EmitStaticVarDecl(D, llvm::GlobalValue::InternalLinkage);
31 }
32
convertOpenCLSpecificType(const Type * T)33 llvm::Type *CGOpenCLRuntime::convertOpenCLSpecificType(const Type *T) {
34 assert(T->isOpenCLSpecificType() &&
35 "Not an OpenCL specific type!");
36
37 llvm::LLVMContext& Ctx = CGM.getLLVMContext();
38 uint32_t AddrSpc = CGM.getContext().getTargetAddressSpace(
39 CGM.getContext().getOpenCLTypeAddrSpace(T));
40 switch (cast<BuiltinType>(T)->getKind()) {
41 default:
42 llvm_unreachable("Unexpected opencl builtin type!");
43 return nullptr;
44 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
45 case BuiltinType::Id: \
46 return llvm::PointerType::get( \
47 llvm::StructType::create(Ctx, "opencl." #ImgType "_" #Suffix "_t"), \
48 AddrSpc);
49 #include "clang/Basic/OpenCLImageTypes.def"
50 case BuiltinType::OCLSampler:
51 return getSamplerType(T);
52 case BuiltinType::OCLEvent:
53 return llvm::PointerType::get(
54 llvm::StructType::create(Ctx, "opencl.event_t"), AddrSpc);
55 case BuiltinType::OCLClkEvent:
56 return llvm::PointerType::get(
57 llvm::StructType::create(Ctx, "opencl.clk_event_t"), AddrSpc);
58 case BuiltinType::OCLQueue:
59 return llvm::PointerType::get(
60 llvm::StructType::create(Ctx, "opencl.queue_t"), AddrSpc);
61 case BuiltinType::OCLReserveID:
62 return llvm::PointerType::get(
63 llvm::StructType::create(Ctx, "opencl.reserve_id_t"), AddrSpc);
64 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
65 case BuiltinType::Id: \
66 return llvm::PointerType::get( \
67 llvm::StructType::create(Ctx, "opencl." #ExtType), AddrSpc);
68 #include "clang/Basic/OpenCLExtensionTypes.def"
69 }
70 }
71
getPipeType(const PipeType * T)72 llvm::Type *CGOpenCLRuntime::getPipeType(const PipeType *T) {
73 if (T->isReadOnly())
74 return getPipeType(T, "opencl.pipe_ro_t", PipeROTy);
75 else
76 return getPipeType(T, "opencl.pipe_wo_t", PipeWOTy);
77 }
78
getPipeType(const PipeType * T,StringRef Name,llvm::Type * & PipeTy)79 llvm::Type *CGOpenCLRuntime::getPipeType(const PipeType *T, StringRef Name,
80 llvm::Type *&PipeTy) {
81 if (!PipeTy)
82 PipeTy = llvm::PointerType::get(llvm::StructType::create(
83 CGM.getLLVMContext(), Name),
84 CGM.getContext().getTargetAddressSpace(
85 CGM.getContext().getOpenCLTypeAddrSpace(T)));
86 return PipeTy;
87 }
88
getSamplerType(const Type * T)89 llvm::PointerType *CGOpenCLRuntime::getSamplerType(const Type *T) {
90 if (!SamplerTy)
91 SamplerTy = llvm::PointerType::get(llvm::StructType::create(
92 CGM.getLLVMContext(), "opencl.sampler_t"),
93 CGM.getContext().getTargetAddressSpace(
94 CGM.getContext().getOpenCLTypeAddrSpace(T)));
95 return SamplerTy;
96 }
97
getPipeElemSize(const Expr * PipeArg)98 llvm::Value *CGOpenCLRuntime::getPipeElemSize(const Expr *PipeArg) {
99 const PipeType *PipeTy = PipeArg->getType()->castAs<PipeType>();
100 // The type of the last (implicit) argument to be passed.
101 llvm::Type *Int32Ty = llvm::IntegerType::getInt32Ty(CGM.getLLVMContext());
102 unsigned TypeSize = CGM.getContext()
103 .getTypeSizeInChars(PipeTy->getElementType())
104 .getQuantity();
105 return llvm::ConstantInt::get(Int32Ty, TypeSize, false);
106 }
107
getPipeElemAlign(const Expr * PipeArg)108 llvm::Value *CGOpenCLRuntime::getPipeElemAlign(const Expr *PipeArg) {
109 const PipeType *PipeTy = PipeArg->getType()->castAs<PipeType>();
110 // The type of the last (implicit) argument to be passed.
111 llvm::Type *Int32Ty = llvm::IntegerType::getInt32Ty(CGM.getLLVMContext());
112 unsigned TypeSize = CGM.getContext()
113 .getTypeAlignInChars(PipeTy->getElementType())
114 .getQuantity();
115 return llvm::ConstantInt::get(Int32Ty, TypeSize, false);
116 }
117
getGenericVoidPointerType()118 llvm::PointerType *CGOpenCLRuntime::getGenericVoidPointerType() {
119 assert(CGM.getLangOpts().OpenCL);
120 return llvm::IntegerType::getInt8PtrTy(
121 CGM.getLLVMContext(),
122 CGM.getContext().getTargetAddressSpace(LangAS::opencl_generic));
123 }
124
125 // Get the block literal from an expression derived from the block expression.
126 // OpenCL v2.0 s6.12.5:
127 // Block variable declarations are implicitly qualified with const. Therefore
128 // all block variables must be initialized at declaration time and may not be
129 // reassigned.
getBlockExpr(const Expr * E)130 static const BlockExpr *getBlockExpr(const Expr *E) {
131 const Expr *Prev = nullptr; // to make sure we do not stuck in infinite loop.
132 while(!isa<BlockExpr>(E) && E != Prev) {
133 Prev = E;
134 E = E->IgnoreCasts();
135 if (auto DR = dyn_cast<DeclRefExpr>(E)) {
136 E = cast<VarDecl>(DR->getDecl())->getInit();
137 }
138 }
139 return cast<BlockExpr>(E);
140 }
141
142 /// Record emitted llvm invoke function and llvm block literal for the
143 /// corresponding block expression.
recordBlockInfo(const BlockExpr * E,llvm::Function * InvokeF,llvm::Value * Block)144 void CGOpenCLRuntime::recordBlockInfo(const BlockExpr *E,
145 llvm::Function *InvokeF,
146 llvm::Value *Block) {
147 assert(EnqueuedBlockMap.find(E) == EnqueuedBlockMap.end() &&
148 "Block expression emitted twice");
149 assert(isa<llvm::Function>(InvokeF) && "Invalid invoke function");
150 assert(Block->getType()->isPointerTy() && "Invalid block literal type");
151 EnqueuedBlockMap[E].InvokeFunc = InvokeF;
152 EnqueuedBlockMap[E].BlockArg = Block;
153 EnqueuedBlockMap[E].Kernel = nullptr;
154 }
155
getInvokeFunction(const Expr * E)156 llvm::Function *CGOpenCLRuntime::getInvokeFunction(const Expr *E) {
157 return EnqueuedBlockMap[getBlockExpr(E)].InvokeFunc;
158 }
159
160 CGOpenCLRuntime::EnqueuedBlockInfo
emitOpenCLEnqueuedBlock(CodeGenFunction & CGF,const Expr * E)161 CGOpenCLRuntime::emitOpenCLEnqueuedBlock(CodeGenFunction &CGF, const Expr *E) {
162 CGF.EmitScalarExpr(E);
163
164 // The block literal may be assigned to a const variable. Chasing down
165 // to get the block literal.
166 const BlockExpr *Block = getBlockExpr(E);
167
168 assert(EnqueuedBlockMap.find(Block) != EnqueuedBlockMap.end() &&
169 "Block expression not emitted");
170
171 // Do not emit the block wrapper again if it has been emitted.
172 if (EnqueuedBlockMap[Block].Kernel) {
173 return EnqueuedBlockMap[Block];
174 }
175
176 auto *F = CGF.getTargetHooks().createEnqueuedBlockKernel(
177 CGF, EnqueuedBlockMap[Block].InvokeFunc,
178 EnqueuedBlockMap[Block].BlockArg->stripPointerCasts());
179
180 // The common part of the post-processing of the kernel goes here.
181 F->addFnAttr(llvm::Attribute::NoUnwind);
182 F->setCallingConv(
183 CGF.getTypes().ClangCallConvToLLVMCallConv(CallingConv::CC_OpenCLKernel));
184 EnqueuedBlockMap[Block].Kernel = F;
185 return EnqueuedBlockMap[Block];
186 }
187