Nick Lewycky | b192870 | 2011-04-16 01:20:23 +0000 | [diff] [blame] | 1 | //===- GCOVProfiling.cpp - Insert edge counters for gcov profiling --------===// |
| 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 implements GCOV-style profiling. When this pass is run it emits |
| 11 | // "gcno" files next to the existing source, and instruments the code that runs |
| 12 | // to records the edges between blocks that run and emit a complementary "gcda" |
| 13 | // file on exit. |
| 14 | // |
| 15 | //===----------------------------------------------------------------------===// |
| 16 | |
| 17 | #define DEBUG_TYPE "insert-gcov-profiling" |
| 18 | |
| 19 | #include "ProfilingUtils.h" |
| 20 | #include "llvm/Transforms/Instrumentation.h" |
| 21 | #include "llvm/Analysis/DebugInfo.h" |
| 22 | #include "llvm/Module.h" |
| 23 | #include "llvm/Pass.h" |
| 24 | #include "llvm/Instructions.h" |
| 25 | #include "llvm/Support/raw_ostream.h" |
| 26 | #include "llvm/Support/Debug.h" |
| 27 | #include "llvm/Support/DebugLoc.h" |
| 28 | #include "llvm/Support/InstIterator.h" |
| 29 | #include "llvm/Support/IRBuilder.h" |
| 30 | #include "llvm/Support/PathV2.h" |
| 31 | #include "llvm/ADT/DenseMap.h" |
| 32 | #include "llvm/ADT/Statistic.h" |
| 33 | #include "llvm/ADT/STLExtras.h" |
| 34 | #include "llvm/ADT/StringExtras.h" |
| 35 | #include "llvm/ADT/StringMap.h" |
| 36 | #include "llvm/ADT/UniqueVector.h" |
| 37 | #include <string> |
| 38 | #include <utility> |
| 39 | using namespace llvm; |
| 40 | |
| 41 | namespace { |
| 42 | class GCOVProfiler : public ModulePass { |
| 43 | bool runOnModule(Module &M); |
| 44 | public: |
| 45 | static char ID; |
Nick Lewycky | a61e52c | 2011-04-21 01:56:25 +0000 | [diff] [blame^] | 46 | GCOVProfiler() |
| 47 | : ModulePass(ID), EmitNotes(true), EmitData(true) { |
| 48 | initializeGCOVProfilerPass(*PassRegistry::getPassRegistry()); |
| 49 | } |
| 50 | GCOVProfiler(bool EmitNotes, bool EmitData) |
| 51 | : ModulePass(ID), EmitNotes(EmitNotes), EmitData(EmitData) { |
| 52 | assert((EmitNotes || EmitData) && "GCOVProfiler asked to do nothing?"); |
Nick Lewycky | b192870 | 2011-04-16 01:20:23 +0000 | [diff] [blame] | 53 | initializeGCOVProfilerPass(*PassRegistry::getPassRegistry()); |
| 54 | } |
| 55 | virtual const char *getPassName() const { |
| 56 | return "GCOV Profiler"; |
| 57 | } |
| 58 | |
| 59 | private: |
| 60 | // Create the GCNO files for the Module based on DebugInfo. |
| 61 | void EmitGCNO(DebugInfoFinder &DIF); |
| 62 | |
Nick Lewycky | 0c4de8a | 2011-04-16 02:05:18 +0000 | [diff] [blame] | 63 | // Modify the program to track transitions along edges and call into the |
| 64 | // profiling runtime to emit .gcda files when run. |
| 65 | bool EmitProfileArcs(DebugInfoFinder &DIF); |
| 66 | |
Nick Lewycky | b192870 | 2011-04-16 01:20:23 +0000 | [diff] [blame] | 67 | // Get pointers to the functions in the runtime library. |
| 68 | Constant *getStartFileFunc(); |
| 69 | Constant *getEmitFunctionFunc(); |
| 70 | Constant *getEmitArcsFunc(); |
| 71 | Constant *getEndFileFunc(); |
| 72 | |
| 73 | // Add the function to write out all our counters to the global destructor |
| 74 | // list. |
| 75 | void InsertCounterWriteout(DebugInfoFinder &, |
| 76 | SmallVector<std::pair<GlobalVariable *, |
| 77 | uint32_t>, 8> &); |
| 78 | |
Nick Lewycky | a61e52c | 2011-04-21 01:56:25 +0000 | [diff] [blame^] | 79 | bool EmitNotes; |
| 80 | bool EmitData; |
| 81 | |
Nick Lewycky | b192870 | 2011-04-16 01:20:23 +0000 | [diff] [blame] | 82 | Module *Mod; |
| 83 | LLVMContext *Ctx; |
| 84 | }; |
| 85 | } |
| 86 | |
| 87 | char GCOVProfiler::ID = 0; |
| 88 | INITIALIZE_PASS(GCOVProfiler, "insert-gcov-profiling", |
| 89 | "Insert instrumentation for GCOV profiling", false, false) |
| 90 | |
Nick Lewycky | a61e52c | 2011-04-21 01:56:25 +0000 | [diff] [blame^] | 91 | ModulePass *llvm::createGCOVProfilerPass(bool EmitNotes, bool EmitData) { |
| 92 | return new GCOVProfiler(EmitNotes, EmitData); |
| 93 | } |
Nick Lewycky | b192870 | 2011-04-16 01:20:23 +0000 | [diff] [blame] | 94 | |
| 95 | static DISubprogram FindSubprogram(DIScope scope) { |
| 96 | while (!scope.isSubprogram()) { |
| 97 | assert(scope.isLexicalBlock() && |
| 98 | "Debug location not lexical block or subprogram"); |
| 99 | scope = DILexicalBlock(scope).getContext(); |
| 100 | } |
| 101 | return DISubprogram(scope); |
| 102 | } |
| 103 | |
| 104 | namespace { |
| 105 | class GCOVRecord { |
| 106 | protected: |
| 107 | static const char *lines_tag; |
| 108 | static const char *function_tag; |
| 109 | static const char *block_tag; |
| 110 | static const char *edge_tag; |
| 111 | |
| 112 | GCOVRecord() {} |
| 113 | |
| 114 | void WriteBytes(const char *b, int size) { |
| 115 | os->write(b, size); |
| 116 | } |
| 117 | |
| 118 | void Write(uint32_t i) { |
| 119 | WriteBytes(reinterpret_cast<char*>(&i), 4); |
| 120 | } |
| 121 | |
| 122 | // Returns the length measured in 4-byte blocks that will be used to |
| 123 | // represent this string in a GCOV file |
| 124 | unsigned LengthOfGCOVString(StringRef s) { |
| 125 | // A GCOV string is a length, followed by a NUL, then between 0 and 3 NULs |
| 126 | // padding out to the next 4-byte word. The length is measured in 4-byte words |
| 127 | // including padding, not bytes of actual string. |
| 128 | return (s.size() + 5) / 4; |
| 129 | } |
| 130 | |
| 131 | void WriteGCOVString(StringRef s) { |
| 132 | uint32_t len = LengthOfGCOVString(s); |
| 133 | Write(len); |
| 134 | WriteBytes(s.data(), s.size()); |
| 135 | |
| 136 | // Write 1 to 4 bytes of NUL padding. |
| 137 | assert((unsigned)(5 - ((s.size() + 1) % 4)) > 0); |
| 138 | assert((unsigned)(5 - ((s.size() + 1) % 4)) <= 4); |
| 139 | WriteBytes("\0\0\0\0", 5 - ((s.size() + 1) % 4)); |
| 140 | } |
| 141 | |
| 142 | raw_ostream *os; |
| 143 | }; |
| 144 | const char *GCOVRecord::lines_tag = "\0\0\x45\x01"; |
| 145 | const char *GCOVRecord::function_tag = "\0\0\0\1"; |
| 146 | const char *GCOVRecord::block_tag = "\0\0\x41\x01"; |
| 147 | const char *GCOVRecord::edge_tag = "\0\0\x43\x01"; |
| 148 | |
| 149 | class GCOVFunction; |
| 150 | class GCOVBlock; |
| 151 | |
| 152 | // Constructed only by requesting it from a GCOVBlock, this object stores a |
| 153 | // list of line numbers and a single filename, representing lines that belong |
| 154 | // to the block. |
| 155 | class GCOVLines : public GCOVRecord { |
| 156 | public: |
| 157 | void AddLine(uint32_t line) { |
| 158 | lines.push_back(line); |
| 159 | } |
| 160 | |
| 161 | uint32_t Length() { |
| 162 | return LengthOfGCOVString(filename) + 2 + lines.size(); |
| 163 | } |
| 164 | |
| 165 | private: |
| 166 | friend class GCOVBlock; |
| 167 | |
| 168 | GCOVLines(std::string filename, raw_ostream *os) |
| 169 | : filename(filename) { |
| 170 | this->os = os; |
| 171 | } |
| 172 | |
| 173 | std::string filename; |
| 174 | SmallVector<uint32_t, 32> lines; |
| 175 | }; |
| 176 | |
| 177 | // Represent a basic block in GCOV. Each block has a unique number in the |
| 178 | // function, number of lines belonging to each block, and a set of edges to |
| 179 | // other blocks. |
| 180 | class GCOVBlock : public GCOVRecord { |
| 181 | public: |
| 182 | GCOVLines &GetFile(std::string filename) { |
| 183 | GCOVLines *&lines = lines_by_file[filename]; |
| 184 | if (!lines) { |
| 185 | lines = new GCOVLines(filename, os); |
| 186 | } |
| 187 | return *lines; |
| 188 | } |
| 189 | |
| 190 | void AddEdge(GCOVBlock &successor) { |
| 191 | out_edges.push_back(&successor); |
| 192 | } |
| 193 | |
| 194 | void WriteOut() { |
| 195 | uint32_t len = 3; |
| 196 | for (StringMap<GCOVLines *>::iterator I = lines_by_file.begin(), |
| 197 | E = lines_by_file.end(); I != E; ++I) { |
| 198 | len += I->second->Length(); |
| 199 | } |
| 200 | |
| 201 | WriteBytes(lines_tag, 4); |
| 202 | Write(len); |
| 203 | Write(number); |
| 204 | for (StringMap<GCOVLines *>::iterator I = lines_by_file.begin(), |
| 205 | E = lines_by_file.end(); I != E; ++I) { |
| 206 | Write(0); |
| 207 | WriteGCOVString(I->second->filename); |
| 208 | for (int i = 0, e = I->second->lines.size(); i != e; ++i) { |
| 209 | Write(I->second->lines[i]); |
| 210 | } |
| 211 | } |
| 212 | Write(0); |
| 213 | Write(0); |
| 214 | } |
| 215 | |
| 216 | ~GCOVBlock() { |
| 217 | DeleteContainerSeconds(lines_by_file); |
| 218 | } |
| 219 | |
| 220 | private: |
| 221 | friend class GCOVFunction; |
| 222 | |
| 223 | GCOVBlock(uint32_t number, raw_ostream *os) |
| 224 | : number(number) { |
| 225 | this->os = os; |
| 226 | } |
| 227 | |
| 228 | uint32_t number; |
| 229 | BasicBlock *block; |
| 230 | StringMap<GCOVLines *> lines_by_file; |
| 231 | SmallVector<GCOVBlock *, 4> out_edges; |
| 232 | }; |
| 233 | |
| 234 | // A function has a unique identifier, a checksum (we leave as zero) and a |
| 235 | // set of blocks and a map of edges between blocks. This is the only GCOV |
| 236 | // object users can construct, the blocks and lines will be rooted here. |
| 237 | class GCOVFunction : public GCOVRecord { |
| 238 | public: |
| 239 | GCOVFunction(DISubprogram SP, raw_ostream *os) { |
| 240 | this->os = os; |
| 241 | |
| 242 | Function *F = SP.getFunction(); |
| 243 | uint32_t i = 0; |
| 244 | for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) { |
| 245 | blocks[BB] = new GCOVBlock(i++, os); |
| 246 | } |
| 247 | |
| 248 | WriteBytes(function_tag, 4); |
| 249 | uint32_t block_len = 1 + 1 + 1 + LengthOfGCOVString(SP.getName()) + |
| 250 | 1 + LengthOfGCOVString(SP.getFilename()) + 1; |
| 251 | Write(block_len); |
| 252 | uint32_t ident = reinterpret_cast<intptr_t>((MDNode*)SP); |
| 253 | Write(ident); |
| 254 | Write(0); // checksum |
| 255 | WriteGCOVString(SP.getName()); |
| 256 | WriteGCOVString(SP.getFilename()); |
| 257 | Write(SP.getLineNumber()); |
| 258 | } |
| 259 | |
| 260 | ~GCOVFunction() { |
| 261 | DeleteContainerSeconds(blocks); |
| 262 | } |
| 263 | |
| 264 | GCOVBlock &GetBlock(BasicBlock *BB) { |
| 265 | return *blocks[BB]; |
| 266 | } |
| 267 | |
| 268 | void WriteOut() { |
| 269 | // Emit count of blocks. |
| 270 | WriteBytes(block_tag, 4); |
| 271 | Write(blocks.size()); |
| 272 | for (int i = 0, e = blocks.size(); i != e; ++i) { |
| 273 | Write(0); // No flags on our blocks. |
| 274 | } |
| 275 | |
| 276 | // Emit edges between blocks. |
| 277 | for (DenseMap<BasicBlock *, GCOVBlock *>::iterator I = blocks.begin(), |
| 278 | E = blocks.end(); I != E; ++I) { |
| 279 | GCOVBlock &block = *I->second; |
| 280 | if (block.out_edges.empty()) continue; |
| 281 | |
| 282 | WriteBytes(edge_tag, 4); |
| 283 | Write(block.out_edges.size() * 2 + 1); |
| 284 | Write(block.number); |
| 285 | for (int i = 0, e = block.out_edges.size(); i != e; ++i) { |
| 286 | Write(block.out_edges[i]->number); |
| 287 | Write(0); // no flags |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | // Emit lines for each block. |
| 292 | for (DenseMap<BasicBlock *, GCOVBlock *>::iterator I = blocks.begin(), |
| 293 | E = blocks.end(); I != E; ++I) { |
| 294 | I->second->WriteOut(); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | private: |
| 299 | DenseMap<BasicBlock *, GCOVBlock *> blocks; |
| 300 | }; |
| 301 | } |
| 302 | |
Nick Lewycky | 0c4de8a | 2011-04-16 02:05:18 +0000 | [diff] [blame] | 303 | // Replace the stem of a file, or add one if missing. |
| 304 | static std::string ReplaceStem(std::string orig_filename, std::string new_stem){ |
| 305 | return (sys::path::stem(orig_filename) + "." + new_stem).str(); |
| 306 | } |
| 307 | |
| 308 | bool GCOVProfiler::runOnModule(Module &M) { |
| 309 | Mod = &M; |
| 310 | Ctx = &M.getContext(); |
| 311 | |
| 312 | DebugInfoFinder DIF; |
| 313 | DIF.processModule(*Mod); |
| 314 | |
Nick Lewycky | a61e52c | 2011-04-21 01:56:25 +0000 | [diff] [blame^] | 315 | if (EmitNotes) EmitGCNO(DIF); |
| 316 | if (EmitData) return EmitProfileArcs(DIF); |
| 317 | return false; |
Nick Lewycky | 0c4de8a | 2011-04-16 02:05:18 +0000 | [diff] [blame] | 318 | } |
| 319 | |
Nick Lewycky | b192870 | 2011-04-16 01:20:23 +0000 | [diff] [blame] | 320 | void GCOVProfiler::EmitGCNO(DebugInfoFinder &DIF) { |
| 321 | DenseMap<const MDNode *, raw_fd_ostream *> gcno_files; |
| 322 | for (DebugInfoFinder::iterator I = DIF.compile_unit_begin(), |
| 323 | E = DIF.compile_unit_end(); I != E; ++I) { |
| 324 | // Each compile unit gets its own .gcno file. This means that whether we run |
| 325 | // this pass over the original .o's as they're produced, or run it after |
| 326 | // LTO, we'll generate the same .gcno files. |
| 327 | |
| 328 | DICompileUnit CU(*I); |
| 329 | raw_fd_ostream *&Out = gcno_files[CU]; |
| 330 | std::string ErrorInfo; |
Nick Lewycky | 0c4de8a | 2011-04-16 02:05:18 +0000 | [diff] [blame] | 331 | Out = new raw_fd_ostream(ReplaceStem(CU.getFilename(), "gcno").c_str(), |
| 332 | ErrorInfo, raw_fd_ostream::F_Binary); |
Nick Lewycky | b192870 | 2011-04-16 01:20:23 +0000 | [diff] [blame] | 333 | Out->write("oncg*404MVLL", 12); |
| 334 | } |
| 335 | |
| 336 | for (DebugInfoFinder::iterator SPI = DIF.subprogram_begin(), |
| 337 | SPE = DIF.subprogram_end(); SPI != SPE; ++SPI) { |
| 338 | DISubprogram SP(*SPI); |
| 339 | raw_fd_ostream *&os = gcno_files[SP.getCompileUnit()]; |
| 340 | |
| 341 | GCOVFunction function(SP, os); |
| 342 | Function *F = SP.getFunction(); |
| 343 | for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) { |
| 344 | GCOVBlock &block = function.GetBlock(BB); |
| 345 | TerminatorInst *TI = BB->getTerminator(); |
| 346 | if (int successors = TI->getNumSuccessors()) { |
| 347 | for (int i = 0; i != successors; ++i) { |
| 348 | block.AddEdge(function.GetBlock(TI->getSuccessor(i))); |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | uint32_t line = 0; |
| 353 | for (BasicBlock::iterator I = BB->begin(), IE = BB->end(); I != IE; ++I) { |
| 354 | const DebugLoc &loc = I->getDebugLoc(); |
| 355 | if (loc.isUnknown()) continue; |
| 356 | if (line == loc.getLine()) continue; |
| 357 | line = loc.getLine(); |
| 358 | if (SP != FindSubprogram(DIScope(loc.getScope(*Ctx)))) continue; |
| 359 | |
| 360 | GCOVLines &lines = block.GetFile(SP.getFilename()); |
| 361 | lines.AddLine(loc.getLine()); |
| 362 | } |
| 363 | } |
| 364 | function.WriteOut(); |
| 365 | } |
| 366 | |
| 367 | for (DenseMap<const MDNode *, raw_fd_ostream *>::iterator |
| 368 | I = gcno_files.begin(), E = gcno_files.end(); I != E; ++I) { |
| 369 | raw_fd_ostream *&Out = I->second; |
| 370 | Out->write("\0\0\0\0\0\0\0\0", 4); // EOF |
| 371 | Out->close(); |
| 372 | delete Out; |
| 373 | } |
| 374 | } |
| 375 | |
Nick Lewycky | 0c4de8a | 2011-04-16 02:05:18 +0000 | [diff] [blame] | 376 | bool GCOVProfiler::EmitProfileArcs(DebugInfoFinder &DIF) { |
| 377 | if (DIF.subprogram_begin() == DIF.subprogram_end()) |
| 378 | return false; |
Nick Lewycky | b192870 | 2011-04-16 01:20:23 +0000 | [diff] [blame] | 379 | |
| 380 | SmallVector<std::pair<GlobalVariable *, uint32_t>, 8> counters_by_ident; |
| 381 | for (DebugInfoFinder::iterator SPI = DIF.subprogram_begin(), |
| 382 | SPE = DIF.subprogram_end(); SPI != SPE; ++SPI) { |
| 383 | DISubprogram SP(*SPI); |
| 384 | Function *F = SP.getFunction(); |
| 385 | |
| 386 | // TODO: GCOV format requires a distinct unified exit block. |
| 387 | unsigned edges = 0; |
| 388 | for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) { |
| 389 | TerminatorInst *TI = BB->getTerminator(); |
| 390 | edges += TI->getNumSuccessors(); |
| 391 | } |
| 392 | |
| 393 | const ArrayType *counter_type = |
| 394 | ArrayType::get(Type::getInt64Ty(*Ctx), edges); |
| 395 | GlobalVariable *counter = |
| 396 | new GlobalVariable(*Mod, counter_type, false, |
| 397 | GlobalValue::InternalLinkage, |
| 398 | Constant::getNullValue(counter_type), |
| 399 | "__llvm_gcov_ctr", 0, false, 0); |
| 400 | counters_by_ident.push_back( |
| 401 | std::make_pair(counter, reinterpret_cast<intptr_t>((MDNode*)SP))); |
| 402 | |
| 403 | UniqueVector<BasicBlock *> complex_edge_preds; |
| 404 | UniqueVector<BasicBlock *> complex_edge_succs; |
| 405 | |
| 406 | unsigned edge_num = 0; |
| 407 | for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) { |
| 408 | TerminatorInst *TI = BB->getTerminator(); |
| 409 | if (int successors = TI->getNumSuccessors()) { |
| 410 | IRBuilder<> builder(TI); |
| 411 | |
| 412 | if (successors == 1) { |
| 413 | Value *ctr = builder.CreateConstInBoundsGEP2_64(counter, 0, edge_num); |
| 414 | Value *count = builder.CreateLoad(ctr); |
| 415 | count = builder.CreateAdd(count, |
| 416 | ConstantInt::get(Type::getInt64Ty(*Ctx),1)); |
| 417 | builder.CreateStore(count, ctr); |
| 418 | } else if (BranchInst *BI = dyn_cast<BranchInst>(TI)) { |
| 419 | Value *sel = builder.CreateSelect( |
| 420 | BI->getCondition(), |
| 421 | ConstantInt::get(Type::getInt64Ty(*Ctx), edge_num), |
| 422 | ConstantInt::get(Type::getInt64Ty(*Ctx), edge_num + 1)); |
| 423 | SmallVector<Value *, 2> idx; |
| 424 | idx.push_back(Constant::getNullValue(Type::getInt64Ty(*Ctx))); |
| 425 | idx.push_back(sel); |
| 426 | Value *ctr = builder.CreateInBoundsGEP(counter, |
| 427 | idx.begin(), idx.end()); |
| 428 | Value *count = builder.CreateLoad(ctr); |
| 429 | count = builder.CreateAdd(count, |
| 430 | ConstantInt::get(Type::getInt64Ty(*Ctx),1)); |
| 431 | builder.CreateStore(count, ctr); |
| 432 | } else { |
| 433 | complex_edge_preds.insert(BB); |
| 434 | for (int i = 0; i != successors; ++i) { |
| 435 | complex_edge_succs.insert(TI->getSuccessor(i)); |
| 436 | } |
| 437 | } |
| 438 | edge_num += successors; |
| 439 | } |
| 440 | } |
| 441 | |
| 442 | // TODO: support switch, invoke, indirectbr |
| 443 | if (!complex_edge_preds.empty()) { |
| 444 | // emit a [preds x [succs x i64*]]. |
| 445 | for (int i = 0, e = complex_edge_preds.size(); i != e; ++i) { |
| 446 | // call runtime to state save |
| 447 | } |
| 448 | for (int i = 0, e = complex_edge_succs.size(); i != e; ++i) { |
| 449 | // call runtime to perform increment |
| 450 | } |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | InsertCounterWriteout(DIF, counters_by_ident); |
| 455 | |
| 456 | return true; |
| 457 | } |
| 458 | |
| 459 | Constant *GCOVProfiler::getStartFileFunc() { |
| 460 | const Type *Args[1] = { Type::getInt8PtrTy(*Ctx) }; |
| 461 | const FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), |
| 462 | Args, false); |
| 463 | return Mod->getOrInsertFunction("llvm_gcda_start_file", FTy); |
| 464 | } |
| 465 | |
| 466 | Constant *GCOVProfiler::getEmitFunctionFunc() { |
| 467 | const Type *Args[1] = { Type::getInt32Ty(*Ctx) }; |
| 468 | const FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), |
| 469 | Args, false); |
| 470 | return Mod->getOrInsertFunction("llvm_gcda_emit_function", FTy); |
| 471 | } |
| 472 | |
| 473 | Constant *GCOVProfiler::getEmitArcsFunc() { |
| 474 | const Type *Args[] = { |
| 475 | Type::getInt32Ty(*Ctx), // uint32_t num_counters |
| 476 | Type::getInt64PtrTy(*Ctx), // uint64_t *counters |
| 477 | }; |
| 478 | const FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), |
| 479 | Args, false); |
| 480 | return Mod->getOrInsertFunction("llvm_gcda_emit_arcs", FTy); |
| 481 | } |
| 482 | |
| 483 | Constant *GCOVProfiler::getEndFileFunc() { |
| 484 | const FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false); |
| 485 | return Mod->getOrInsertFunction("llvm_gcda_end_file", FTy); |
| 486 | } |
| 487 | |
Nick Lewycky | b192870 | 2011-04-16 01:20:23 +0000 | [diff] [blame] | 488 | void GCOVProfiler::InsertCounterWriteout( |
| 489 | DebugInfoFinder &DIF, |
| 490 | SmallVector<std::pair<GlobalVariable *, uint32_t>, 8> &counters_by_ident) { |
| 491 | |
| 492 | const FunctionType *WriteoutFTy = |
| 493 | FunctionType::get(Type::getVoidTy(*Ctx), false); |
| 494 | Function *WriteoutF = Function::Create(WriteoutFTy, |
| 495 | GlobalValue::InternalLinkage, |
| 496 | "__llvm_gcda_writeout", Mod); |
| 497 | WriteoutF->setUnnamedAddr(true); |
| 498 | BasicBlock *BB = BasicBlock::Create(*Ctx, "", WriteoutF); |
| 499 | IRBuilder<> builder(BB); |
| 500 | |
| 501 | Constant *StartFile = getStartFileFunc(); |
| 502 | Constant *EmitFunction = getEmitFunctionFunc(); |
| 503 | Constant *EmitArcs = getEmitArcsFunc(); |
| 504 | Constant *EndFile = getEndFileFunc(); |
| 505 | |
| 506 | for (DebugInfoFinder::iterator CUI = DIF.compile_unit_begin(), |
| 507 | CUE = DIF.compile_unit_end(); CUI != CUE; ++CUI) { |
| 508 | DICompileUnit compile_unit(*CUI); |
| 509 | std::string filename_gcda = ReplaceStem(compile_unit.getFilename(), "gcda"); |
| 510 | builder.CreateCall(StartFile, |
| 511 | builder.CreateGlobalStringPtr(filename_gcda)); |
| 512 | for (SmallVector<std::pair<GlobalVariable *, uint32_t>, 8>::iterator |
| 513 | I = counters_by_ident.begin(), E = counters_by_ident.end(); |
| 514 | I != E; ++I) { |
| 515 | builder.CreateCall(EmitFunction, ConstantInt::get(Type::getInt32Ty(*Ctx), |
| 516 | I->second)); |
| 517 | GlobalVariable *GV = I->first; |
| 518 | unsigned num_arcs = |
| 519 | cast<ArrayType>(GV->getType()->getElementType())->getNumElements(); |
| 520 | builder.CreateCall2( |
| 521 | EmitArcs, |
| 522 | ConstantInt::get(Type::getInt32Ty(*Ctx), num_arcs), |
| 523 | builder.CreateConstGEP2_64(GV, 0, 0)); |
| 524 | } |
| 525 | builder.CreateCall(EndFile); |
| 526 | } |
| 527 | builder.CreateRetVoid(); |
| 528 | |
| 529 | InsertProfilingShutdownCall(WriteoutF, Mod); |
| 530 | } |