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1 | //===- NVVMReflect.cpp - NVVM Emulate conditional compilation -------------===// |
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 pass replaces occurrences of __nvvm_reflect("string") with an | |
11 | // integer based on -nvvm-reflect-list string=<int> option given to this pass. | |
12 | // If an undefined string value is seen in a call to __nvvm_reflect("string"), | |
13 | // a default value of 0 will be used. | |
14 | // | |
15 | //===----------------------------------------------------------------------===// | |
16 | ||
17 | #include "NVPTX.h" | |
18 | #include "llvm/ADT/DenseMap.h" | |
19 | #include "llvm/ADT/SmallVector.h" | |
20 | #include "llvm/ADT/StringMap.h" | |
21 | #include "llvm/IR/Constants.h" | |
22 | #include "llvm/IR/DerivedTypes.h" | |
23 | #include "llvm/IR/Function.h" | |
24 | #include "llvm/IR/Instructions.h" | |
25 | #include "llvm/IR/Intrinsics.h" | |
26 | #include "llvm/IR/Module.h" | |
27 | #include "llvm/IR/Type.h" | |
28 | #include "llvm/Pass.h" | |
29 | #include "llvm/Support/CommandLine.h" | |
30 | #include "llvm/Support/Debug.h" | |
31 | #include "llvm/Support/raw_os_ostream.h" | |
32 | #include "llvm/Transforms/Scalar.h" | |
33 | #include <map> | |
34 | #include <sstream> | |
35 | #include <string> | |
36 | #include <vector> | |
37 | ||
38 | #define NVVM_REFLECT_FUNCTION "__nvvm_reflect" | |
39 | ||
40 | using namespace llvm; | |
41 | ||
42 | #define DEBUG_TYPE "nvptx-reflect" | |
43 | ||
44 | namespace llvm { void initializeNVVMReflectPass(PassRegistry &); } | |
45 | ||
46 | namespace { | |
47 | class NVVMReflect : public ModulePass { | |
48 | private: | |
49 | StringMap<int> VarMap; | |
50 | typedef DenseMap<std::string, int>::iterator VarMapIter; | |
51 | ||
52 | public: | |
53 | static char ID; | |
54 | NVVMReflect() : ModulePass(ID) { | |
55 | initializeNVVMReflectPass(*PassRegistry::getPassRegistry()); | |
56 | VarMap.clear(); | |
57 | } | |
58 | ||
59 | NVVMReflect(const StringMap<int> &Mapping) | |
60 | : ModulePass(ID) { | |
61 | initializeNVVMReflectPass(*PassRegistry::getPassRegistry()); | |
62 | for (StringMap<int>::const_iterator I = Mapping.begin(), E = Mapping.end(); | |
63 | I != E; ++I) { | |
64 | VarMap[(*I).getKey()] = (*I).getValue(); | |
65 | } | |
66 | } | |
67 | ||
68 | void getAnalysisUsage(AnalysisUsage &AU) const override { | |
69 | AU.setPreservesAll(); | |
70 | } | |
71 | bool runOnModule(Module &) override; | |
72 | ||
73 | private: | |
74 | bool handleFunction(Function *ReflectFunction); | |
75 | void setVarMap(); | |
76 | }; | |
77 | } | |
78 | ||
79 | ModulePass *llvm::createNVVMReflectPass() { | |
80 | return new NVVMReflect(); | |
81 | } | |
82 | ||
83 | ModulePass *llvm::createNVVMReflectPass(const StringMap<int>& Mapping) { | |
84 | return new NVVMReflect(Mapping); | |
85 | } | |
86 | ||
87 | static cl::opt<bool> | |
88 | NVVMReflectEnabled("nvvm-reflect-enable", cl::init(true), cl::Hidden, | |
89 | cl::desc("NVVM reflection, enabled by default")); | |
90 | ||
91 | char NVVMReflect::ID = 0; | |
92 | INITIALIZE_PASS(NVVMReflect, "nvvm-reflect", | |
93 | "Replace occurrences of __nvvm_reflect() calls with 0/1", false, | |
94 | false) | |
95 | ||
96 | static cl::list<std::string> | |
97 | ReflectList("nvvm-reflect-list", cl::value_desc("name=<int>"), cl::Hidden, | |
98 | cl::desc("A list of string=num assignments"), | |
99 | cl::ValueRequired); | |
100 | ||
101 | /// The command line can look as follows : | |
102 | /// -nvvm-reflect-list a=1,b=2 -nvvm-reflect-list c=3,d=0 -R e=2 | |
103 | /// The strings "a=1,b=2", "c=3,d=0", "e=2" are available in the | |
104 | /// ReflectList vector. First, each of ReflectList[i] is 'split' | |
105 | /// using "," as the delimiter. Then each of this part is split | |
106 | /// using "=" as the delimiter. | |
107 | void NVVMReflect::setVarMap() { | |
108 | for (unsigned i = 0, e = ReflectList.size(); i != e; ++i) { | |
109 | DEBUG(dbgs() << "Option : " << ReflectList[i] << "\n"); | |
110 | SmallVector<StringRef, 4> NameValList; | |
111 | StringRef(ReflectList[i]).split(NameValList, ","); | |
112 | for (unsigned j = 0, ej = NameValList.size(); j != ej; ++j) { | |
113 | SmallVector<StringRef, 2> NameValPair; | |
114 | NameValList[j].split(NameValPair, "="); | |
115 | assert(NameValPair.size() == 2 && "name=val expected"); | |
116 | std::stringstream ValStream(NameValPair[1]); | |
117 | int Val; | |
118 | ValStream >> Val; | |
119 | assert((!(ValStream.fail())) && "integer value expected"); | |
120 | VarMap[NameValPair[0]] = Val; | |
121 | } | |
122 | } | |
123 | } | |
124 | ||
125 | bool NVVMReflect::handleFunction(Function *ReflectFunction) { | |
126 | // Validate _reflect function | |
127 | assert(ReflectFunction->isDeclaration() && | |
128 | "_reflect function should not have a body"); | |
129 | assert(ReflectFunction->getReturnType()->isIntegerTy() && | |
130 | "_reflect's return type should be integer"); | |
131 | ||
132 | std::vector<Instruction *> ToRemove; | |
133 | ||
134 | // Go through the uses of ReflectFunction in this Function. | |
135 | // Each of them should a CallInst with a ConstantArray argument. | |
136 | // First validate that. If the c-string corresponding to the | |
137 | // ConstantArray can be found successfully, see if it can be | |
138 | // found in VarMap. If so, replace the uses of CallInst with the | |
139 | // value found in VarMap. If not, replace the use with value 0. | |
140 | for (User *U : ReflectFunction->users()) { | |
141 | assert(isa<CallInst>(U) && "Only a call instruction can use _reflect"); | |
142 | CallInst *Reflect = cast<CallInst>(U); | |
143 | ||
144 | assert((Reflect->getNumOperands() == 2) && | |
145 | "Only one operand expect for _reflect function"); | |
146 | // In cuda, we will have an extra constant-to-generic conversion of | |
147 | // the string. | |
148 | const Value *Str = Reflect->getArgOperand(0); | |
149 | if (isa<CallInst>(Str)) { | |
150 | // CUDA path | |
151 | const CallInst *ConvCall = cast<CallInst>(Str); | |
152 | Str = ConvCall->getArgOperand(0); | |
153 | } | |
154 | assert(isa<ConstantExpr>(Str) && | |
155 | "Format of _reflect function not recognized"); | |
156 | const ConstantExpr *GEP = cast<ConstantExpr>(Str); | |
157 | ||
158 | const Value *Sym = GEP->getOperand(0); | |
159 | assert(isa<Constant>(Sym) && "Format of _reflect function not recognized"); | |
160 | ||
161 | const Constant *SymStr = cast<Constant>(Sym); | |
162 | ||
163 | assert(isa<ConstantDataSequential>(SymStr->getOperand(0)) && | |
164 | "Format of _reflect function not recognized"); | |
165 | ||
166 | assert(cast<ConstantDataSequential>(SymStr->getOperand(0))->isCString() && | |
167 | "Format of _reflect function not recognized"); | |
168 | ||
169 | std::string ReflectArg = | |
170 | cast<ConstantDataSequential>(SymStr->getOperand(0))->getAsString(); | |
171 | ||
172 | ReflectArg = ReflectArg.substr(0, ReflectArg.size() - 1); | |
173 | DEBUG(dbgs() << "Arg of _reflect : " << ReflectArg << "\n"); | |
174 | ||
175 | int ReflectVal = 0; // The default value is 0 | |
176 | if (VarMap.find(ReflectArg) != VarMap.end()) { | |
177 | ReflectVal = VarMap[ReflectArg]; | |
178 | } | |
179 | Reflect->replaceAllUsesWith( | |
180 | ConstantInt::get(Reflect->getType(), ReflectVal)); | |
181 | ToRemove.push_back(Reflect); | |
182 | } | |
183 | if (ToRemove.size() == 0) | |
184 | return false; | |
185 | ||
186 | for (unsigned i = 0, e = ToRemove.size(); i != e; ++i) | |
187 | ToRemove[i]->eraseFromParent(); | |
188 | return true; | |
189 | } | |
190 | ||
191 | bool NVVMReflect::runOnModule(Module &M) { | |
192 | if (!NVVMReflectEnabled) | |
193 | return false; | |
194 | ||
195 | setVarMap(); | |
196 | ||
197 | ||
198 | bool Res = false; | |
199 | std::string Name; | |
200 | Type *Tys[1]; | |
201 | Type *I8Ty = Type::getInt8Ty(M.getContext()); | |
202 | Function *ReflectFunction; | |
203 | ||
204 | // Check for standard overloaded versions of llvm.nvvm.reflect | |
205 | ||
206 | for (unsigned i = 0; i != 5; ++i) { | |
207 | Tys[0] = PointerType::get(I8Ty, i); | |
208 | Name = Intrinsic::getName(Intrinsic::nvvm_reflect, Tys); | |
209 | ReflectFunction = M.getFunction(Name); | |
210 | if(ReflectFunction != 0) { | |
211 | Res |= handleFunction(ReflectFunction); | |
212 | } | |
213 | } | |
214 | ||
215 | ReflectFunction = M.getFunction(NVVM_REFLECT_FUNCTION); | |
216 | // If reflect function is not used, then there will be | |
217 | // no entry in the module. | |
218 | if (ReflectFunction != 0) | |
219 | Res |= handleFunction(ReflectFunction); | |
220 | ||
221 | return Res; | |
222 | } |