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/SystemUtils.h"
31 #include "llvm/Support/Debug.h"
32 #include "llvm/Support/raw_ostream.h"
33 #include "llvm/System/Path.h"
34 #include "llvm/System/Program.h"
36 #define DONT_GET_PLUGIN_LOADER_OPTION
37 #include "llvm/Support/PluginLoader.h"
43 extern cl::opt<std::string> OutputPrefix;
47 // ChildOutput - This option captures the name of the child output file that
48 // is set up by the parent bugpoint process
49 cl::opt<std::string> ChildOutput("child-output", cl::ReallyHidden);
52 /// writeProgramToFile - This writes the current "Program" to the named bitcode
53 /// file. If an error occurs, true is returned.
55 bool BugDriver::writeProgramToFile(const std::string &Filename,
56 const Module *M) const {
58 tool_output_file Out(Filename.c_str(), ErrInfo,
59 raw_fd_ostream::F_Binary);
60 if (ErrInfo.empty()) {
61 WriteBitcodeToFile(M, Out.os());
63 if (!Out.os().has_error()) {
68 Out.os().clear_error();
73 /// EmitProgressBitcode - This function is used to output the current Program
74 /// to a file named "bugpoint-ID.bc".
76 void BugDriver::EmitProgressBitcode(const Module *M,
77 const std::string &ID,
79 // Output the input to the current pass to a bitcode file, emit a message
80 // telling the user how to reproduce it: opt -foo blah.bc
82 std::string Filename = OutputPrefix + "-" + ID + ".bc";
83 if (writeProgramToFile(Filename, M)) {
84 errs() << "Error opening file '" << Filename << "' for writing!\n";
88 outs() << "Emitted bitcode to '" << Filename << "'\n";
89 if (NoFlyer || PassesToRun.empty()) return;
90 outs() << "\n*** You can reproduce the problem with: ";
91 if (UseValgrind) outs() << "valgrind ";
92 outs() << "opt " << Filename << " ";
93 outs() << getPassesString(PassesToRun) << "\n";
96 cl::opt<bool> SilencePasses("silence-passes", cl::desc("Suppress output of running passes (both stdout and stderr)"));
98 static cl::list<std::string> OptArgs("opt-args", cl::Positional,
99 cl::desc("<opt arguments>..."),
100 cl::ZeroOrMore, cl::PositionalEatsArgs);
102 /// runPasses - Run the specified passes on Program, outputting a bitcode file
103 /// and writing the filename into OutputFile if successful. If the
104 /// optimizations fail for some reason (optimizer crashes), return true,
105 /// otherwise return false. If DeleteOutput is set to true, the bitcode is
106 /// deleted on success, and the filename string is undefined. This prints to
107 /// outs() a single line message indicating whether compilation was successful
110 bool BugDriver::runPasses(Module *Program,
111 const std::vector<std::string> &Passes,
112 std::string &OutputFilename, bool DeleteOutput,
113 bool Quiet, unsigned NumExtraArgs,
114 const char * const *ExtraArgs) const {
115 // setup the output file name
117 sys::Path uniqueFilename(OutputPrefix + "-output.bc");
119 if (uniqueFilename.makeUnique(true, &ErrMsg)) {
120 errs() << getToolName() << ": Error making unique filename: "
124 OutputFilename = uniqueFilename.str();
126 // set up the input file name
127 sys::Path inputFilename(OutputPrefix + "-input.bc");
128 if (inputFilename.makeUnique(true, &ErrMsg)) {
129 errs() << getToolName() << ": Error making unique filename: "
135 tool_output_file InFile(inputFilename.c_str(), ErrInfo,
136 raw_fd_ostream::F_Binary);
139 if (!ErrInfo.empty()) {
140 errs() << "Error opening bitcode file: " << inputFilename.str() << "\n";
143 WriteBitcodeToFile(Program, InFile.os());
145 if (InFile.os().has_error()) {
146 errs() << "Error writing bitcode file: " << inputFilename.str() << "\n";
147 InFile.os().clear_error();
152 // setup the child process' arguments
153 SmallVector<const char*, 8> Args;
154 sys::Path tool = FindExecutable("opt", getToolName(), (void*)"opt");
155 std::string Opt = tool.str();
157 Args.push_back("valgrind");
158 Args.push_back("--error-exitcode=1");
159 Args.push_back("-q");
160 Args.push_back(tool.c_str());
162 Args.push_back(Opt.c_str());
164 Args.push_back("-o");
165 Args.push_back(OutputFilename.c_str());
166 for (unsigned i = 0, e = OptArgs.size(); i != e; ++i)
167 Args.push_back(OptArgs[i].c_str());
168 std::vector<std::string> pass_args;
169 for (unsigned i = 0, e = PluginLoader::getNumPlugins(); i != e; ++i) {
170 pass_args.push_back( std::string("-load"));
171 pass_args.push_back( PluginLoader::getPlugin(i));
173 for (std::vector<std::string>::const_iterator I = Passes.begin(),
174 E = Passes.end(); I != E; ++I )
175 pass_args.push_back( std::string("-") + (*I) );
176 for (std::vector<std::string>::const_iterator I = pass_args.begin(),
177 E = pass_args.end(); I != E; ++I )
178 Args.push_back(I->c_str());
179 Args.push_back(inputFilename.c_str());
180 for (unsigned i = 0; i < NumExtraArgs; ++i)
181 Args.push_back(*ExtraArgs);
184 DEBUG(errs() << "\nAbout to run:\t";
185 for (unsigned i = 0, e = Args.size()-1; i != e; ++i)
186 errs() << " " << Args[i];
192 prog = sys::Program::FindProgramByName("valgrind");
196 // Redirect stdout and stderr to nowhere if SilencePasses is given
198 const sys::Path *Redirects[3] = {0, &Nowhere, &Nowhere};
200 int result = sys::Program::ExecuteAndWait(prog, Args.data(), 0,
201 (SilencePasses ? Redirects : 0),
202 Timeout, MemoryLimit, &ErrMsg);
204 // If we are supposed to delete the bitcode file or if the passes crashed,
205 // remove it now. This may fail if the file was never created, but that's ok.
206 if (DeleteOutput || result != 0)
207 sys::Path(OutputFilename).eraseFromDisk();
209 // Remove the temporary input file as well
210 inputFilename.eraseFromDisk();
214 outs() << "Success!\n";
216 outs() << "Exited with error code '" << result << "'\n";
217 else if (result < 0) {
219 outs() << "Execute failed: " << ErrMsg << "\n";
221 outs() << "Crashed with signal #" << abs(result) << "\n";
223 if (result & 0x01000000)
224 outs() << "Dumped core\n";
227 // Was the child successful?
232 /// runPassesOn - Carefully run the specified set of pass on the specified
233 /// module, returning the transformed module on success, or a null pointer on
235 Module *BugDriver::runPassesOn(Module *M,
236 const std::vector<std::string> &Passes,
237 bool AutoDebugCrashes, unsigned NumExtraArgs,
238 const char * const *ExtraArgs) {
239 std::string BitcodeResult;
240 if (runPasses(M, Passes, BitcodeResult, false/*delete*/, true/*quiet*/,
241 NumExtraArgs, ExtraArgs)) {
242 if (AutoDebugCrashes) {
243 errs() << " Error running this sequence of passes"
244 << " on the input program!\n";
245 delete swapProgramIn(M);
246 EmitProgressBitcode(M, "pass-error", false);
247 exit(debugOptimizerCrash());
252 Module *Ret = ParseInputFile(BitcodeResult, Context);
254 errs() << getToolName() << ": Error reading bitcode file '"
255 << BitcodeResult << "'!\n";
258 sys::Path(BitcodeResult).eraseFromDisk(); // No longer need the file on disk