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/Debug.h"
31 #include "llvm/Support/raw_ostream.h"
32 #include "llvm/System/Path.h"
33 #include "llvm/System/Program.h"
35 #define DONT_GET_PLUGIN_LOADER_OPTION
36 #include "llvm/Support/PluginLoader.h"
42 extern cl::opt<std::string> OutputPrefix;
46 // ChildOutput - This option captures the name of the child output file that
47 // is set up by the parent bugpoint process
48 cl::opt<std::string> ChildOutput("child-output", cl::ReallyHidden);
51 /// writeProgramToFile - This writes the current "Program" to the named bitcode
52 /// file. If an error occurs, true is returned.
54 bool BugDriver::writeProgramToFile(const std::string &Filename,
55 const Module *M) const {
57 raw_fd_ostream Out(Filename.c_str(), ErrInfo,
58 raw_fd_ostream::F_Binary);
59 if (!ErrInfo.empty()) return true;
61 WriteBitcodeToFile(M, Out);
66 /// EmitProgressBitcode - This function is used to output the current Program
67 /// to a file named "bugpoint-ID.bc".
69 void BugDriver::EmitProgressBitcode(const Module *M,
70 const std::string &ID,
72 // Output the input to the current pass to a bitcode file, emit a message
73 // telling the user how to reproduce it: opt -foo blah.bc
75 std::string Filename = OutputPrefix + "-" + ID + ".bc";
76 if (writeProgramToFile(Filename, M)) {
77 errs() << "Error opening file '" << Filename << "' for writing!\n";
81 outs() << "Emitted bitcode to '" << Filename << "'\n";
82 if (NoFlyer || PassesToRun.empty()) return;
83 outs() << "\n*** You can reproduce the problem with: ";
84 if (UseValgrind) outs() << "valgrind ";
85 outs() << "opt " << Filename << " ";
86 outs() << getPassesString(PassesToRun) << "\n";
89 cl::opt<bool> SilencePasses("silence-passes", cl::desc("Suppress output of running passes (both stdout and stderr)"));
91 static cl::list<std::string> OptArgs("opt-args", cl::Positional,
92 cl::desc("<opt arguments>..."),
93 cl::ZeroOrMore, cl::PositionalEatsArgs);
95 /// runPasses - Run the specified passes on Program, outputting a bitcode file
96 /// and writing the filename into OutputFile if successful. If the
97 /// optimizations fail for some reason (optimizer crashes), return true,
98 /// otherwise return false. If DeleteOutput is set to true, the bitcode is
99 /// deleted on success, and the filename string is undefined. This prints to
100 /// outs() a single line message indicating whether compilation was successful
103 bool BugDriver::runPasses(Module *Program,
104 const std::vector<std::string> &Passes,
105 std::string &OutputFilename, bool DeleteOutput,
106 bool Quiet, unsigned NumExtraArgs,
107 const char * const *ExtraArgs) const {
108 // setup the output file name
110 sys::Path uniqueFilename(OutputPrefix + "-output.bc");
112 if (uniqueFilename.makeUnique(true, &ErrMsg)) {
113 errs() << getToolName() << ": Error making unique filename: "
117 OutputFilename = uniqueFilename.str();
119 // set up the input file name
120 sys::Path inputFilename(OutputPrefix + "-input.bc");
121 if (inputFilename.makeUnique(true, &ErrMsg)) {
122 errs() << getToolName() << ": Error making unique filename: "
128 raw_fd_ostream InFile(inputFilename.c_str(), ErrInfo,
129 raw_fd_ostream::F_Binary);
132 if (!ErrInfo.empty()) {
133 errs() << "Error opening bitcode file: " << inputFilename.str() << "\n";
136 WriteBitcodeToFile(Program, InFile);
139 // setup the child process' arguments
140 SmallVector<const char*, 8> Args;
142 llvm::StringRef TN(ToolName);
143 if (TN.find('/') == llvm::StringRef::npos) {
146 std::pair<llvm::StringRef, llvm::StringRef> P = TN.rsplit('/');
147 Opt = P.first.str() + "/" + "opt";
150 sys::Path tool = sys::Program::FindProgramByName(Opt);
152 Args.push_back("valgrind");
153 Args.push_back("--error-exitcode=1");
154 Args.push_back("-q");
155 Args.push_back(tool.c_str());
157 Args.push_back(Opt.c_str());
159 Args.push_back("-o");
160 Args.push_back(OutputFilename.c_str());
161 for (unsigned i = 0, e = OptArgs.size(); i != e; ++i)
162 Args.push_back(OptArgs[i].c_str());
163 std::vector<std::string> pass_args;
164 for (unsigned i = 0, e = PluginLoader::getNumPlugins(); i != e; ++i) {
165 pass_args.push_back( std::string("-load"));
166 pass_args.push_back( PluginLoader::getPlugin(i));
168 for (std::vector<std::string>::const_iterator I = Passes.begin(),
169 E = Passes.end(); I != E; ++I )
170 pass_args.push_back( std::string("-") + (*I) );
171 for (std::vector<std::string>::const_iterator I = pass_args.begin(),
172 E = pass_args.end(); I != E; ++I )
173 Args.push_back(I->c_str());
174 Args.push_back(inputFilename.c_str());
175 for (unsigned i = 0; i < NumExtraArgs; ++i)
176 Args.push_back(*ExtraArgs);
179 DEBUG(errs() << "\nAbout to run:\t";
180 for (unsigned i = 0, e = Args.size()-1; i != e; ++i)
181 errs() << " " << Args[i];
187 prog = sys::Program::FindProgramByName("valgrind");
191 // Redirect stdout and stderr to nowhere if SilencePasses is given
193 const sys::Path *Redirects[3] = {0, &Nowhere, &Nowhere};
195 int result = sys::Program::ExecuteAndWait(prog, Args.data(), 0,
196 (SilencePasses ? Redirects : 0),
197 Timeout, MemoryLimit, &ErrMsg);
199 // If we are supposed to delete the bitcode file or if the passes crashed,
200 // remove it now. This may fail if the file was never created, but that's ok.
201 if (DeleteOutput || result != 0)
202 sys::Path(OutputFilename).eraseFromDisk();
204 // Remove the temporary input file as well
205 inputFilename.eraseFromDisk();
209 outs() << "Success!\n";
211 outs() << "Exited with error code '" << result << "'\n";
212 else if (result < 0) {
214 outs() << "Execute failed: " << ErrMsg << "\n";
216 outs() << "Crashed with signal #" << abs(result) << "\n";
218 if (result & 0x01000000)
219 outs() << "Dumped core\n";
222 // Was the child successful?
227 /// runPassesOn - Carefully run the specified set of pass on the specified
228 /// module, returning the transformed module on success, or a null pointer on
230 Module *BugDriver::runPassesOn(Module *M,
231 const std::vector<std::string> &Passes,
232 bool AutoDebugCrashes, unsigned NumExtraArgs,
233 const char * const *ExtraArgs) {
234 std::string BitcodeResult;
235 if (runPasses(M, Passes, BitcodeResult, false/*delete*/, true/*quiet*/,
236 NumExtraArgs, ExtraArgs)) {
237 if (AutoDebugCrashes) {
238 errs() << " Error running this sequence of passes"
239 << " on the input program!\n";
240 delete swapProgramIn(M);
241 EmitProgressBitcode(M, "pass-error", false);
242 exit(debugOptimizerCrash());
247 Module *Ret = ParseInputFile(BitcodeResult, Context);
249 errs() << getToolName() << ": Error reading bitcode file '"
250 << BitcodeResult << "'!\n";
253 sys::Path(BitcodeResult).eraseFromDisk(); // No longer need the file on disk