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 #include "BugDriver.h"
19 #include "llvm/Analysis/Verifier.h"
20 #include "llvm/Bitcode/ReaderWriter.h"
21 #include "llvm/IR/DataLayout.h"
22 #include "llvm/IR/Module.h"
23 #include "llvm/PassManager.h"
24 #include "llvm/Support/CommandLine.h"
25 #include "llvm/Support/Debug.h"
26 #include "llvm/Support/FileUtilities.h"
27 #include "llvm/Support/Path.h"
28 #include "llvm/Support/PathV1.h"
29 #include "llvm/Support/Program.h"
30 #include "llvm/Support/SystemUtils.h"
31 #include "llvm/Support/ToolOutputFile.h"
33 #define DONT_GET_PLUGIN_LOADER_OPTION
34 #include "llvm/Support/PluginLoader.h"
40 extern cl::opt<std::string> OutputPrefix;
44 // ChildOutput - This option captures the name of the child output file that
45 // is set up by the parent bugpoint process
46 cl::opt<std::string> ChildOutput("child-output", cl::ReallyHidden);
49 /// writeProgramToFile - This writes the current "Program" to the named bitcode
50 /// file. If an error occurs, true is returned.
52 bool BugDriver::writeProgramToFile(const std::string &Filename,
53 const Module *M) const {
55 tool_output_file Out(Filename.c_str(), ErrInfo,
56 raw_fd_ostream::F_Binary);
57 if (ErrInfo.empty()) {
58 WriteBitcodeToFile(M, Out.os());
60 if (!Out.os().has_error()) {
65 Out.os().clear_error();
70 /// EmitProgressBitcode - This function is used to output the current Program
71 /// to a file named "bugpoint-ID.bc".
73 void BugDriver::EmitProgressBitcode(const Module *M,
74 const std::string &ID,
76 // Output the input to the current pass to a bitcode file, emit a message
77 // telling the user how to reproduce it: opt -foo blah.bc
79 std::string Filename = OutputPrefix + "-" + ID + ".bc";
80 if (writeProgramToFile(Filename, M)) {
81 errs() << "Error opening file '" << Filename << "' for writing!\n";
85 outs() << "Emitted bitcode to '" << Filename << "'\n";
86 if (NoFlyer || PassesToRun.empty()) return;
87 outs() << "\n*** You can reproduce the problem with: ";
88 if (UseValgrind) outs() << "valgrind ";
89 outs() << "opt " << Filename;
90 for (unsigned i = 0, e = PluginLoader::getNumPlugins(); i != e; ++i) {
91 outs() << " -load " << PluginLoader::getPlugin(i);
93 outs() << " " << getPassesString(PassesToRun) << "\n";
96 cl::opt<bool> SilencePasses("silence-passes",
97 cl::desc("Suppress output of running passes (both stdout and stderr)"));
99 static cl::list<std::string> OptArgs("opt-args", cl::Positional,
100 cl::desc("<opt arguments>..."),
101 cl::ZeroOrMore, cl::PositionalEatsArgs);
103 /// runPasses - Run the specified passes on Program, outputting a bitcode file
104 /// and writing the filename into OutputFile if successful. If the
105 /// optimizations fail for some reason (optimizer crashes), return true,
106 /// otherwise return false. If DeleteOutput is set to true, the bitcode is
107 /// deleted on success, and the filename string is undefined. This prints to
108 /// outs() a single line message indicating whether compilation was successful
111 bool BugDriver::runPasses(Module *Program,
112 const std::vector<std::string> &Passes,
113 std::string &OutputFilename, bool DeleteOutput,
114 bool Quiet, unsigned NumExtraArgs,
115 const char * const *ExtraArgs) const {
116 // setup the output file name
118 sys::Path uniqueFilename(OutputPrefix + "-output.bc");
120 if (uniqueFilename.makeUnique(true, &ErrMsg)) {
121 errs() << getToolName() << ": Error making unique filename: "
125 OutputFilename = uniqueFilename.str();
127 // set up the input file name
128 sys::Path inputFilename(OutputPrefix + "-input.bc");
129 if (inputFilename.makeUnique(true, &ErrMsg)) {
130 errs() << getToolName() << ": Error making unique filename: "
136 tool_output_file InFile(inputFilename.c_str(), ErrInfo,
137 raw_fd_ostream::F_Binary);
140 if (!ErrInfo.empty()) {
141 errs() << "Error opening bitcode file: " << inputFilename.str() << "\n";
144 WriteBitcodeToFile(Program, InFile.os());
146 if (InFile.os().has_error()) {
147 errs() << "Error writing bitcode file: " << inputFilename.str() << "\n";
148 InFile.os().clear_error();
152 std::string tool = sys::FindProgramByName("opt");
154 errs() << "Cannot find `opt' in PATH!\n";
158 // Ok, everything that could go wrong before running opt is done.
161 // setup the child process' arguments
162 SmallVector<const char*, 8> Args;
164 Args.push_back("valgrind");
165 Args.push_back("--error-exitcode=1");
166 Args.push_back("-q");
167 Args.push_back(tool.c_str());
169 Args.push_back(tool.c_str());
171 Args.push_back("-o");
172 Args.push_back(OutputFilename.c_str());
173 for (unsigned i = 0, e = OptArgs.size(); i != e; ++i)
174 Args.push_back(OptArgs[i].c_str());
175 std::vector<std::string> pass_args;
176 for (unsigned i = 0, e = PluginLoader::getNumPlugins(); i != e; ++i) {
177 pass_args.push_back( std::string("-load"));
178 pass_args.push_back( PluginLoader::getPlugin(i));
180 for (std::vector<std::string>::const_iterator I = Passes.begin(),
181 E = Passes.end(); I != E; ++I )
182 pass_args.push_back( std::string("-") + (*I) );
183 for (std::vector<std::string>::const_iterator I = pass_args.begin(),
184 E = pass_args.end(); I != E; ++I )
185 Args.push_back(I->c_str());
186 Args.push_back(inputFilename.c_str());
187 for (unsigned i = 0; i < NumExtraArgs; ++i)
188 Args.push_back(*ExtraArgs);
191 DEBUG(errs() << "\nAbout to run:\t";
192 for (unsigned i = 0, e = Args.size()-1; i != e; ++i)
193 errs() << " " << Args[i];
199 prog = sys::FindProgramByName("valgrind");
203 // Redirect stdout and stderr to nowhere if SilencePasses is given
205 const StringRef *Redirects[3] = {0, &Nowhere, &Nowhere};
207 int result = sys::ExecuteAndWait(prog.str(), Args.data(), 0,
208 (SilencePasses ? Redirects : 0), Timeout,
209 MemoryLimit, &ErrMsg);
211 // If we are supposed to delete the bitcode file or if the passes crashed,
212 // remove it now. This may fail if the file was never created, but that's ok.
213 if (DeleteOutput || result != 0)
214 sys::Path(OutputFilename).eraseFromDisk();
216 // Remove the temporary input file as well
217 inputFilename.eraseFromDisk();
221 outs() << "Success!\n";
223 outs() << "Exited with error code '" << result << "'\n";
224 else if (result < 0) {
226 outs() << "Execute failed: " << ErrMsg << "\n";
228 outs() << "Crashed: " << ErrMsg << "\n";
230 if (result & 0x01000000)
231 outs() << "Dumped core\n";
234 // Was the child successful?
239 /// runPassesOn - Carefully run the specified set of pass on the specified
240 /// module, returning the transformed module on success, or a null pointer on
242 Module *BugDriver::runPassesOn(Module *M,
243 const std::vector<std::string> &Passes,
244 bool AutoDebugCrashes, unsigned NumExtraArgs,
245 const char * const *ExtraArgs) {
246 std::string BitcodeResult;
247 if (runPasses(M, Passes, BitcodeResult, false/*delete*/, true/*quiet*/,
248 NumExtraArgs, ExtraArgs)) {
249 if (AutoDebugCrashes) {
250 errs() << " Error running this sequence of passes"
251 << " on the input program!\n";
252 delete swapProgramIn(M);
253 EmitProgressBitcode(M, "pass-error", false);
254 exit(debugOptimizerCrash());
259 Module *Ret = ParseInputFile(BitcodeResult, Context);
261 errs() << getToolName() << ": Error reading bitcode file '"
262 << BitcodeResult << "'!\n";
265 sys::Path(BitcodeResult).eraseFromDisk(); // No longer need the file on disk