1 //===- OptimizerDriver.cpp - Allow BugPoint to run passes safely ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source 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/Bytecode/WriteBytecodePass.h"
27 #include "llvm/Target/TargetData.h"
28 #include "llvm/Support/FileUtilities.h"
29 #include "llvm/Support/CommandLine.h"
30 #include "llvm/System/Path.h"
31 #include "llvm/System/Program.h"
32 #include "llvm/Config/alloca.h"
34 #define DONT_GET_PLUGIN_LOADER_OPTION
35 #include "llvm/Support/PluginLoader.h"
41 // ChildOutput - This option captures the name of the child output file that
42 // is set up by the parent bugpoint process
43 cl::opt<std::string> ChildOutput("child-output", cl::ReallyHidden);
44 cl::opt<bool> UseValgrind("enable-valgrind",
45 cl::desc("Run optimizations through valgrind"));
48 /// writeProgramToFile - This writes the current "Program" to the named bytecode
49 /// file. If an error occurs, true is returned.
51 bool BugDriver::writeProgramToFile(const std::string &Filename,
53 std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
55 std::ofstream Out(Filename.c_str(), io_mode);
56 if (!Out.good()) return true;
58 WriteBytecodeToFile(M ? M : Program, Out, /*compression=*/true);
66 /// EmitProgressBytecode - This function is used to output the current Program
67 /// to a file named "bugpoint-ID.bc".
69 void BugDriver::EmitProgressBytecode(const std::string &ID, bool NoFlyer) {
70 // Output the input to the current pass to a bytecode file, emit a message
71 // telling the user how to reproduce it: opt -foo blah.bc
73 std::string Filename = "bugpoint-" + ID + ".bc";
74 if (writeProgramToFile(Filename)) {
75 std::cerr << "Error opening file '" << Filename << "' for writing!\n";
79 std::cout << "Emitted bytecode to '" << Filename << "'\n";
80 if (NoFlyer || PassesToRun.empty()) return;
81 std::cout << "\n*** You can reproduce the problem with: ";
82 std::cout << "opt " << Filename << " ";
83 std::cout << getPassesString(PassesToRun) << "\n";
86 int BugDriver::runPassesAsChild(const std::vector<const PassInfo*> &Passes) {
88 std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
90 std::ofstream OutFile(ChildOutput.c_str(), io_mode);
91 if (!OutFile.good()) {
92 std::cerr << "Error opening bytecode 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 std::cerr << "Cannot create pass yet: " << Passes[i]->getPassName()
107 // Check that the module is well formed on completion of optimization
108 PM.add(createVerifierPass());
110 // Write bytecode out to disk as the last step...
111 PM.add(new WriteBytecodePass(&OutFile));
113 // Run all queued passes.
119 /// runPasses - Run the specified passes on Program, outputting a bytecode file
120 /// and writing the filename into OutputFile if successful. If the
121 /// optimizations fail for some reason (optimizer crashes), return true,
122 /// otherwise return false. If DeleteOutput is set to true, the bytecode is
123 /// deleted on success, and the filename string is undefined. This prints to
124 /// cout a single line message indicating whether compilation was successful or
127 bool BugDriver::runPasses(const std::vector<const PassInfo*> &Passes,
128 std::string &OutputFilename, bool DeleteOutput,
130 // setup the output file name
131 std::cout << std::flush;
132 sys::Path uniqueFilename("bugpoint-output.bc");
134 if (uniqueFilename.makeUnique(true, &ErrMsg)) {
135 std::cerr << getToolName() << ": Error making unique filename: "
139 OutputFilename = uniqueFilename.toString();
141 // set up the input file name
142 sys::Path inputFilename("bugpoint-input.bc");
143 if (inputFilename.makeUnique(true, &ErrMsg)) {
144 std::cerr << getToolName() << ": Error making unique filename: "
148 std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
150 std::ofstream InFile(inputFilename.c_str(), io_mode);
151 if (!InFile.good()) {
152 std::cerr << "Error opening bytecode file: " << inputFilename << "\n";
155 WriteBytecodeToFile(Program,InFile,false);
158 // setup the child process' arguments
159 const char** args = (const char**)
160 alloca(sizeof(const char*) *
161 (Passes.size()+13+2*PluginLoader::getNumPlugins()));
163 sys::Path tool = sys::Program::FindProgramByName(ToolName);
165 args[n++] = "valgrind";
166 args[n++] = "--error-exitcode=1";
168 args[n++] = tool.c_str();
170 args[n++] = ToolName.c_str();
172 args[n++] = "-as-child";
173 args[n++] = "-child-output";
174 args[n++] = OutputFilename.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<const PassInfo*>::const_iterator I = Passes.begin(),
181 E = Passes.end(); I != E; ++I )
182 pass_args.push_back( std::string("-") + (*I)->getPassArgument() );
183 for (std::vector<std::string>::const_iterator I = pass_args.begin(),
184 E = pass_args.end(); I != E; ++I )
185 args[n++] = I->c_str();
186 args[n++] = inputFilename.c_str();
191 prog = sys::Program::FindProgramByName("valgrind");
194 int result = sys::Program::ExecuteAndWait(prog,args,0,0,Timeout,&ErrMsg);
196 // If we are supposed to delete the bytecode file or if the passes crashed,
197 // remove it now. This may fail if the file was never created, but that's ok.
198 if (DeleteOutput || result != 0)
199 sys::Path(OutputFilename).eraseFromDisk();
201 // Remove the temporary input file as well
202 inputFilename.eraseFromDisk();
206 std::cout << "Success!\n";
208 std::cout << "Exited with error code '" << result << "'\n";
209 else if (result < 0) {
211 std::cout << "Execute failed: " << ErrMsg << "\n";
213 std::cout << "Crashed with signal #" << abs(result) << "\n";
215 if (result & 0x01000000)
216 std::cout << "Dumped core\n";
219 // Was the child successful?
224 /// runPassesOn - Carefully run the specified set of pass on the specified
225 /// module, returning the transformed module on success, or a null pointer on
227 Module *BugDriver::runPassesOn(Module *M,
228 const std::vector<const PassInfo*> &Passes,
229 bool AutoDebugCrashes) {
230 Module *OldProgram = swapProgramIn(M);
231 std::string BytecodeResult;
232 if (runPasses(Passes, BytecodeResult, false/*delete*/, true/*quiet*/)) {
233 if (AutoDebugCrashes) {
234 std::cerr << " Error running this sequence of passes"
235 << " on the input program!\n";
237 EmitProgressBytecode("pass-error", false);
238 exit(debugOptimizerCrash());
240 swapProgramIn(OldProgram);
244 // Restore the current program.
245 swapProgramIn(OldProgram);
247 Module *Ret = ParseInputFile(BytecodeResult);
249 std::cerr << getToolName() << ": Error reading bytecode file '"
250 << BytecodeResult << "'!\n";
253 sys::Path(BytecodeResult).eraseFromDisk(); // No longer need the file on disk