1 //===- llvm-prof.cpp - Read in and process llvmprof.out data files --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This tools is meant for use with the various LLVM profiling instrumentation
11 // passes. It reads in the data file produced by executing an instrumented
12 // program, and outputs a nice report.
14 //===----------------------------------------------------------------------===//
16 #include "llvm/InstrTypes.h"
17 #include "llvm/LLVMContext.h"
18 #include "llvm/Module.h"
19 #include "llvm/Assembly/AsmAnnotationWriter.h"
20 #include "llvm/Analysis/ProfileInfoLoader.h"
21 #include "llvm/Bitcode/ReaderWriter.h"
22 #include "llvm/Support/CommandLine.h"
23 #include "llvm/Support/ManagedStatic.h"
24 #include "llvm/Support/MemoryBuffer.h"
25 #include "llvm/Support/PrettyStackTrace.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include "llvm/System/Signals.h"
38 BitcodeFile(cl::Positional, cl::desc("<program bitcode file>"),
42 ProfileDataFile(cl::Positional, cl::desc("<llvmprof.out file>"),
43 cl::Optional, cl::init("llvmprof.out"));
46 PrintAnnotatedLLVM("annotated-llvm",
47 cl::desc("Print LLVM code with frequency annotations"));
48 cl::alias PrintAnnotated2("A", cl::desc("Alias for --annotated-llvm"),
49 cl::aliasopt(PrintAnnotatedLLVM));
51 PrintAllCode("print-all-code",
52 cl::desc("Print annotated code for the entire program"));
55 // PairSecondSort - A sorting predicate to sort by the second element of a pair.
57 struct PairSecondSortReverse
58 : public std::binary_function<std::pair<T, unsigned>,
59 std::pair<T, unsigned>, bool> {
60 bool operator()(const std::pair<T, unsigned> &LHS,
61 const std::pair<T, unsigned> &RHS) const {
62 return LHS.second > RHS.second;
67 class ProfileAnnotator : public AssemblyAnnotationWriter {
68 std::map<const Function *, unsigned> &FuncFreqs;
69 std::map<const BasicBlock*, unsigned> &BlockFreqs;
70 std::map<ProfileInfoLoader::Edge, unsigned> &EdgeFreqs;
72 ProfileAnnotator(std::map<const Function *, unsigned> &FF,
73 std::map<const BasicBlock*, unsigned> &BF,
74 std::map<ProfileInfoLoader::Edge, unsigned> &EF)
75 : FuncFreqs(FF), BlockFreqs(BF), EdgeFreqs(EF) {}
77 virtual void emitFunctionAnnot(const Function *F, raw_ostream &OS) {
78 OS << ";;; %" << F->getName() << " called " << FuncFreqs[F]
81 virtual void emitBasicBlockStartAnnot(const BasicBlock *BB,
83 if (BlockFreqs.empty()) return;
84 std::map<const BasicBlock *, unsigned>::const_iterator I =
86 if (I != BlockFreqs.end())
87 OS << "\t;;; Basic block executed " << I->second << " times.\n";
89 OS << "\t;;; Never executed!\n";
92 virtual void emitBasicBlockEndAnnot(const BasicBlock *BB, raw_ostream &OS) {
93 if (EdgeFreqs.empty()) return;
95 // Figure out how many times each successor executed.
96 std::vector<std::pair<const BasicBlock*, unsigned> > SuccCounts;
97 const TerminatorInst *TI = BB->getTerminator();
99 std::map<ProfileInfoLoader::Edge, unsigned>::iterator I =
100 EdgeFreqs.lower_bound(std::make_pair(const_cast<BasicBlock*>(BB), 0U));
101 for (; I != EdgeFreqs.end() && I->first.first == BB; ++I)
103 SuccCounts.push_back(std::make_pair(TI->getSuccessor(I->first.second),
105 if (!SuccCounts.empty()) {
106 OS << "\t;;; Out-edge counts:";
107 for (unsigned i = 0, e = SuccCounts.size(); i != e; ++i)
108 OS << " [" << SuccCounts[i].second << " -> "
109 << SuccCounts[i].first->getName() << "]";
117 int main(int argc, char **argv) {
118 // Print a stack trace if we signal out.
119 sys::PrintStackTraceOnErrorSignal();
120 PrettyStackTraceProgram X(argc, argv);
123 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
125 cl::ParseCommandLineOptions(argc, argv, "llvm profile dump decoder\n");
127 // Read in the bitcode file...
128 std::string ErrorMessage;
130 if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(BitcodeFile,
132 M = ParseBitcodeFile(Buffer, Context, &ErrorMessage);
136 std::cerr << argv[0] << ": " << BitcodeFile << ": "
137 << ErrorMessage << "\n";
141 // Read the profiling information
142 ProfileInfoLoader PI(argv[0], ProfileDataFile, *M);
144 std::map<const Function *, unsigned> FuncFreqs;
145 std::map<const BasicBlock*, unsigned> BlockFreqs;
146 std::map<ProfileInfoLoader::Edge, unsigned> EdgeFreqs;
148 // Output a report. Eventually, there will be multiple reports selectable on
149 // the command line, for now, just keep things simple.
151 // Emit the most frequent function table...
152 std::vector<std::pair<Function*, unsigned> > FunctionCounts;
153 PI.getFunctionCounts(FunctionCounts);
154 FuncFreqs.insert(FunctionCounts.begin(), FunctionCounts.end());
156 // Sort by the frequency, backwards.
157 sort(FunctionCounts.begin(), FunctionCounts.end(),
158 PairSecondSortReverse<Function*>());
160 uint64_t TotalExecutions = 0;
161 for (unsigned i = 0, e = FunctionCounts.size(); i != e; ++i)
162 TotalExecutions += FunctionCounts[i].second;
164 std::cout << "===" << std::string(73, '-') << "===\n"
165 << "LLVM profiling output for execution";
166 if (PI.getNumExecutions() != 1) std::cout << "s";
169 for (unsigned i = 0, e = PI.getNumExecutions(); i != e; ++i) {
171 if (e != 1) std::cout << i+1 << ". ";
172 std::cout << PI.getExecution(i) << "\n";
175 std::cout << "\n===" << std::string(73, '-') << "===\n";
176 std::cout << "Function execution frequencies:\n\n";
178 // Print out the function frequencies...
179 std::cout << " ## Frequency\n";
180 for (unsigned i = 0, e = FunctionCounts.size(); i != e; ++i) {
181 if (FunctionCounts[i].second == 0) {
182 std::cout << "\n NOTE: " << e-i << " function" <<
183 (e-i-1 ? "s were" : " was") << " never executed!\n";
187 std::cout << std::setw(3) << i+1 << ". "
188 << std::setw(5) << FunctionCounts[i].second << "/"
189 << TotalExecutions << " "
190 << FunctionCounts[i].first->getName().c_str() << "\n";
193 std::set<Function*> FunctionsToPrint;
195 // If we have block count information, print out the LLVM module with
196 // frequency annotations.
197 if (PI.hasAccurateBlockCounts()) {
198 std::vector<std::pair<BasicBlock*, unsigned> > Counts;
199 PI.getBlockCounts(Counts);
202 for (unsigned i = 0, e = Counts.size(); i != e; ++i)
203 TotalExecutions += Counts[i].second;
205 // Sort by the frequency, backwards.
206 sort(Counts.begin(), Counts.end(),
207 PairSecondSortReverse<BasicBlock*>());
209 std::cout << "\n===" << std::string(73, '-') << "===\n";
210 std::cout << "Top 20 most frequently executed basic blocks:\n\n";
212 // Print out the function frequencies...
213 std::cout <<" ## %% \tFrequency\n";
214 unsigned BlocksToPrint = Counts.size();
215 if (BlocksToPrint > 20) BlocksToPrint = 20;
216 for (unsigned i = 0; i != BlocksToPrint; ++i) {
217 if (Counts[i].second == 0) break;
218 Function *F = Counts[i].first->getParent();
219 std::cout << std::setw(3) << i+1 << ". "
220 << std::setw(5) << std::setprecision(2)
221 << Counts[i].second/(double)TotalExecutions*100 << "% "
222 << std::setw(5) << Counts[i].second << "/"
223 << TotalExecutions << "\t"
224 << F->getName().c_str() << "() - "
225 << Counts[i].first->getName().c_str() << "\n";
226 FunctionsToPrint.insert(F);
229 BlockFreqs.insert(Counts.begin(), Counts.end());
232 if (PI.hasAccurateEdgeCounts()) {
233 std::vector<std::pair<ProfileInfoLoader::Edge, unsigned> > Counts;
234 PI.getEdgeCounts(Counts);
235 EdgeFreqs.insert(Counts.begin(), Counts.end());
238 if (PrintAnnotatedLLVM || PrintAllCode) {
239 std::cout << "\n===" << std::string(73, '-') << "===\n";
240 std::cout << "Annotated LLVM code for the module:\n\n";
242 ProfileAnnotator PA(FuncFreqs, BlockFreqs, EdgeFreqs);
244 if (FunctionsToPrint.empty() || PrintAllCode)
245 M->print(std::cout, &PA);
247 // Print just a subset of the functions.
248 for (std::set<Function*>::iterator I = FunctionsToPrint.begin(),
249 E = FunctionsToPrint.end(); I != E; ++I)
250 (*I)->print(std::cout, &PA);
254 } catch (const std::string& msg) {
255 std::cerr << argv[0] << ": " << msg << "\n";
257 std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";