1 //===- OptimizerDriver.cpp - Allow BugPoint to run passes safely ----------===//
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 file defines an interface that allows bugpoint to run various passes
11 // without the threat of a buggy pass corrupting bugpoint (of course, bugpoint
12 // may have its own bugs, but that's another story...). It achieves this by
13 // forking a copy of itself and having the child process do the optimizations.
14 // If this client dies, we can always fork a new one. :)
16 //===----------------------------------------------------------------------===//
18 // Note: as a short term hack, the old Unix-specific code and platform-
19 // independent code co-exist via conditional compilation until it is verified
20 // that the new code works correctly on Unix.
22 #include "BugDriver.h"
23 #include "llvm/Module.h"
24 #include "llvm/PassManager.h"
25 #include "llvm/Analysis/Verifier.h"
26 #include "llvm/Bitcode/ReaderWriter.h"
27 #include "llvm/Target/TargetData.h"
28 #include "llvm/Support/FileUtilities.h"
29 #include "llvm/Support/CommandLine.h"
30 #include "llvm/Support/raw_ostream.h"
31 #include "llvm/System/Path.h"
32 #include "llvm/System/Program.h"
34 #define DONT_GET_PLUGIN_LOADER_OPTION
35 #include "llvm/Support/PluginLoader.h"
41 extern cl::opt<std::string> OutputPrefix;
45 // ChildOutput - This option captures the name of the child output file that
46 // is set up by the parent bugpoint process
47 cl::opt<std::string> ChildOutput("child-output", cl::ReallyHidden);
50 /// writeProgramToFile - This writes the current "Program" to the named bitcode
51 /// file. If an error occurs, true is returned.
53 bool BugDriver::writeProgramToFile(const std::string &Filename,
54 const Module *M) const {
56 raw_fd_ostream Out(Filename.c_str(), ErrInfo,
57 raw_fd_ostream::F_Binary);
58 if (!ErrInfo.empty()) return true;
60 WriteBitcodeToFile(M, Out);
65 /// EmitProgressBitcode - This function is used to output the current Program
66 /// to a file named "bugpoint-ID.bc".
68 void BugDriver::EmitProgressBitcode(const Module *M,
69 const std::string &ID, bool NoFlyer) {
70 // Output the input to the current pass to a bitcode file, emit a message
71 // telling the user how to reproduce it: opt -foo blah.bc
73 std::string Filename = OutputPrefix + "-" + ID + ".bc";
74 if (writeProgramToFile(Filename, M)) {
75 errs() << "Error opening file '" << Filename << "' for writing!\n";
79 outs() << "Emitted bitcode to '" << Filename << "'\n";
80 if (NoFlyer || PassesToRun.empty()) return;
81 outs() << "\n*** You can reproduce the problem with: ";
82 if (UseValgrind) outs() << "valgrind ";
83 outs() << "opt " << Filename << " ";
84 outs() << getPassesString(PassesToRun) << "\n";
87 int BugDriver::runPassesAsChild(const std::vector<const PassInfo*> &Passes) {
89 raw_fd_ostream OutFile(ChildOutput.c_str(), ErrInfo,
90 raw_fd_ostream::F_Binary);
91 if (!ErrInfo.empty()) {
92 errs() << "Error opening bitcode file: " << ChildOutput << "\n";
97 // Make sure that the appropriate target data is always used...
98 PM.add(new TargetData(Program));
100 for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
101 if (Passes[i]->getNormalCtor())
102 PM.add(Passes[i]->getNormalCtor()());
104 errs() << "Cannot create pass yet: " << Passes[i]->getPassName() << "\n";
106 // Check that the module is well formed on completion of optimization
107 PM.add(createVerifierPass());
109 // Write bitcode out to disk as the last step...
110 PM.add(createBitcodeWriterPass(OutFile));
112 // Run all queued passes.
118 cl::opt<bool> SilencePasses("silence-passes", cl::desc("Suppress output of running passes (both stdout and stderr)"));
120 /// runPasses - Run the specified passes on Program, outputting a bitcode file
121 /// and writing the filename into OutputFile if successful. If the
122 /// optimizations fail for some reason (optimizer crashes), return true,
123 /// otherwise return false. If DeleteOutput is set to true, the bitcode is
124 /// deleted on success, and the filename string is undefined. This prints to
125 /// outs() a single line message indicating whether compilation was successful
128 bool BugDriver::runPasses(const std::vector<const PassInfo*> &Passes,
129 std::string &OutputFilename, bool DeleteOutput,
130 bool Quiet, unsigned NumExtraArgs,
131 const char * const *ExtraArgs) const {
132 // setup the output file name
134 sys::Path uniqueFilename(OutputPrefix + "-output.bc");
136 if (uniqueFilename.makeUnique(true, &ErrMsg)) {
137 errs() << getToolName() << ": Error making unique filename: "
141 OutputFilename = uniqueFilename.str();
143 // set up the input file name
144 sys::Path inputFilename(OutputPrefix + "-input.bc");
145 if (inputFilename.makeUnique(true, &ErrMsg)) {
146 errs() << getToolName() << ": Error making unique filename: "
152 raw_fd_ostream InFile(inputFilename.c_str(), ErrInfo,
153 raw_fd_ostream::F_Binary);
156 if (!ErrInfo.empty()) {
157 errs() << "Error opening bitcode file: " << inputFilename.str() << "\n";
160 WriteBitcodeToFile(Program, InFile);
163 // setup the child process' arguments
164 SmallVector<const char*, 8> Args;
165 sys::Path tool = sys::Program::FindProgramByName(ToolName);
167 Args.push_back("valgrind");
168 Args.push_back("--error-exitcode=1");
169 Args.push_back("-q");
170 Args.push_back(tool.c_str());
172 Args.push_back(ToolName);
174 Args.push_back("-as-child");
175 Args.push_back("-child-output");
176 Args.push_back(OutputFilename.c_str());
177 std::vector<std::string> pass_args;
178 for (unsigned i = 0, e = PluginLoader::getNumPlugins(); i != e; ++i) {
179 pass_args.push_back( std::string("-load"));
180 pass_args.push_back( PluginLoader::getPlugin(i));
182 for (std::vector<const PassInfo*>::const_iterator I = Passes.begin(),
183 E = Passes.end(); I != E; ++I )
184 pass_args.push_back( std::string("-") + (*I)->getPassArgument() );
185 for (std::vector<std::string>::const_iterator I = pass_args.begin(),
186 E = pass_args.end(); I != E; ++I )
187 Args.push_back(I->c_str());
188 Args.push_back(inputFilename.c_str());
189 for (unsigned i = 0; i < NumExtraArgs; ++i)
190 Args.push_back(*ExtraArgs);
195 prog = sys::Program::FindProgramByName("valgrind");
199 // Redirect stdout and stderr to nowhere if SilencePasses is given
201 const sys::Path *Redirects[3] = {0, &Nowhere, &Nowhere};
203 int result = sys::Program::ExecuteAndWait(prog, Args.data(), 0,
204 (SilencePasses ? Redirects : 0),
205 Timeout, MemoryLimit, &ErrMsg);
207 // If we are supposed to delete the bitcode file or if the passes crashed,
208 // remove it now. This may fail if the file was never created, but that's ok.
209 if (DeleteOutput || result != 0)
210 sys::Path(OutputFilename).eraseFromDisk();
212 // Remove the temporary input file as well
213 inputFilename.eraseFromDisk();
217 outs() << "Success!\n";
219 outs() << "Exited with error code '" << result << "'\n";
220 else if (result < 0) {
222 outs() << "Execute failed: " << ErrMsg << "\n";
224 outs() << "Crashed with signal #" << abs(result) << "\n";
226 if (result & 0x01000000)
227 outs() << "Dumped core\n";
230 // Was the child successful?
235 /// runPassesOn - Carefully run the specified set of pass on the specified
236 /// module, returning the transformed module on success, or a null pointer on
238 Module *BugDriver::runPassesOn(Module *M,
239 const std::vector<const PassInfo*> &Passes,
240 bool AutoDebugCrashes, unsigned NumExtraArgs,
241 const char * const *ExtraArgs) {
242 Module *OldProgram = swapProgramIn(M);
243 std::string BitcodeResult;
244 if (runPasses(Passes, BitcodeResult, false/*delete*/, true/*quiet*/,
245 NumExtraArgs, ExtraArgs)) {
246 if (AutoDebugCrashes) {
247 errs() << " Error running this sequence of passes"
248 << " on the input program!\n";
250 EmitProgressBitcode(Program, "pass-error", false);
251 exit(debugOptimizerCrash());
253 swapProgramIn(OldProgram);
257 // Restore the current program.
258 swapProgramIn(OldProgram);
260 Module *Ret = ParseInputFile(BitcodeResult, Context);
262 errs() << getToolName() << ": Error reading bitcode file '"
263 << BitcodeResult << "'!\n";
266 sys::Path(BitcodeResult).eraseFromDisk(); // No longer need the file on disk