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259 lines
8.9 KiB
C++
259 lines
8.9 KiB
C++
//===- OptimizerDriver.cpp - Allow BugPoint to run passes safely ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an interface that allows bugpoint to run various passes
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// without the threat of a buggy pass corrupting bugpoint (of course, bugpoint
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// may have its own bugs, but that's another story...). It achieves this by
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// forking a copy of itself and having the child process do the optimizations.
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// If this client dies, we can always fork a new one. :)
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//
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//===----------------------------------------------------------------------===//
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// Note: as a short term hack, the old Unix-specific code and platform-
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// independent code co-exist via conditional compilation until it is verified
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// that the new code works correctly on Unix.
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#include "BugDriver.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Bytecode/WriteBytecodePass.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/System/Path.h"
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#include "llvm/System/Program.h"
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#include "llvm/Config/alloca.h"
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#define DONT_GET_PLUGIN_LOADER_OPTION
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#include "llvm/Support/PluginLoader.h"
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#include <fstream>
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using namespace llvm;
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namespace {
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// ChildOutput - This option captures the name of the child output file that
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// is set up by the parent bugpoint process
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cl::opt<std::string> ChildOutput("child-output", cl::ReallyHidden);
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cl::opt<bool> UseValgrind("enable-valgrind",
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cl::desc("Run optimizations through valgrind"));
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}
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/// writeProgramToFile - This writes the current "Program" to the named bytecode
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/// file. If an error occurs, true is returned.
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///
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bool BugDriver::writeProgramToFile(const std::string &Filename,
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Module *M) const {
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std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
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std::ios::binary;
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std::ofstream Out(Filename.c_str(), io_mode);
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if (!Out.good()) return true;
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try {
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OStream L(Out);
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WriteBytecodeToFile(M ? M : Program, L, /*compression=*/false);
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} catch (...) {
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return true;
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}
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return false;
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}
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/// EmitProgressBytecode - This function is used to output the current Program
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/// to a file named "bugpoint-ID.bc".
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///
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void BugDriver::EmitProgressBytecode(const std::string &ID, bool NoFlyer) {
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// Output the input to the current pass to a bytecode file, emit a message
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// telling the user how to reproduce it: opt -foo blah.bc
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//
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std::string Filename = "bugpoint-" + ID + ".bc";
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if (writeProgramToFile(Filename)) {
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cerr << "Error opening file '" << Filename << "' for writing!\n";
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return;
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}
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cout << "Emitted bytecode to '" << Filename << "'\n";
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if (NoFlyer || PassesToRun.empty()) return;
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cout << "\n*** You can reproduce the problem with: ";
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cout << "opt " << Filename << " ";
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cout << getPassesString(PassesToRun) << "\n";
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}
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int BugDriver::runPassesAsChild(const std::vector<const PassInfo*> &Passes) {
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std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
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std::ios::binary;
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std::ofstream OutFile(ChildOutput.c_str(), io_mode);
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if (!OutFile.good()) {
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cerr << "Error opening bytecode file: " << ChildOutput << "\n";
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return 1;
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}
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PassManager PM;
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// Make sure that the appropriate target data is always used...
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PM.add(new TargetData(Program));
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for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
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if (Passes[i]->getNormalCtor())
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PM.add(Passes[i]->getNormalCtor()());
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else
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cerr << "Cannot create pass yet: " << Passes[i]->getPassName() << "\n";
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}
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// Check that the module is well formed on completion of optimization
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PM.add(createVerifierPass());
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// Write bytecode out to disk as the last step...
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OStream L(OutFile);
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PM.add(new WriteBytecodePass(&L));
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// Run all queued passes.
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PM.run(*Program);
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return 0;
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}
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/// runPasses - Run the specified passes on Program, outputting a bytecode file
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/// and writing the filename into OutputFile if successful. If the
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/// optimizations fail for some reason (optimizer crashes), return true,
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/// otherwise return false. If DeleteOutput is set to true, the bytecode is
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/// deleted on success, and the filename string is undefined. This prints to
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/// cout a single line message indicating whether compilation was successful or
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/// failed.
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///
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bool BugDriver::runPasses(const std::vector<const PassInfo*> &Passes,
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std::string &OutputFilename, bool DeleteOutput,
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bool Quiet) const {
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// setup the output file name
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cout << std::flush;
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sys::Path uniqueFilename("bugpoint-output.bc");
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std::string ErrMsg;
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if (uniqueFilename.makeUnique(true, &ErrMsg)) {
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cerr << getToolName() << ": Error making unique filename: "
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<< ErrMsg << "\n";
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return(1);
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}
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OutputFilename = uniqueFilename.toString();
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// set up the input file name
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sys::Path inputFilename("bugpoint-input.bc");
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if (inputFilename.makeUnique(true, &ErrMsg)) {
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cerr << getToolName() << ": Error making unique filename: "
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<< ErrMsg << "\n";
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return(1);
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}
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std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
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std::ios::binary;
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std::ofstream InFile(inputFilename.c_str(), io_mode);
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if (!InFile.good()) {
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cerr << "Error opening bytecode file: " << inputFilename << "\n";
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return(1);
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}
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OStream L(InFile);
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WriteBytecodeToFile(Program,L,false);
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InFile.close();
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// setup the child process' arguments
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const char** args = (const char**)
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alloca(sizeof(const char*) *
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(Passes.size()+13+2*PluginLoader::getNumPlugins()));
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int n = 0;
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sys::Path tool = sys::Program::FindProgramByName(ToolName);
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if (UseValgrind) {
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args[n++] = "valgrind";
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args[n++] = "--error-exitcode=1";
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args[n++] = "-q";
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args[n++] = tool.c_str();
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} else
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args[n++] = ToolName.c_str();
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args[n++] = "-as-child";
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args[n++] = "-child-output";
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args[n++] = OutputFilename.c_str();
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std::vector<std::string> pass_args;
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for (unsigned i = 0, e = PluginLoader::getNumPlugins(); i != e; ++i) {
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pass_args.push_back( std::string("-load"));
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pass_args.push_back( PluginLoader::getPlugin(i));
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}
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for (std::vector<const PassInfo*>::const_iterator I = Passes.begin(),
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E = Passes.end(); I != E; ++I )
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pass_args.push_back( std::string("-") + (*I)->getPassArgument() );
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for (std::vector<std::string>::const_iterator I = pass_args.begin(),
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E = pass_args.end(); I != E; ++I )
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args[n++] = I->c_str();
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args[n++] = inputFilename.c_str();
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args[n++] = 0;
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sys::Path prog;
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if (UseValgrind)
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prog = sys::Program::FindProgramByName("valgrind");
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else
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prog = tool;
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int result = sys::Program::ExecuteAndWait(prog,args,0,0,Timeout,&ErrMsg);
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// If we are supposed to delete the bytecode file or if the passes crashed,
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// remove it now. This may fail if the file was never created, but that's ok.
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if (DeleteOutput || result != 0)
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sys::Path(OutputFilename).eraseFromDisk();
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// Remove the temporary input file as well
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inputFilename.eraseFromDisk();
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if (!Quiet) {
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if (result == 0)
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cout << "Success!\n";
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else if (result > 0)
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cout << "Exited with error code '" << result << "'\n";
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else if (result < 0) {
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if (result == -1)
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cout << "Execute failed: " << ErrMsg << "\n";
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else
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cout << "Crashed with signal #" << abs(result) << "\n";
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}
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if (result & 0x01000000)
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cout << "Dumped core\n";
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}
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// Was the child successful?
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return result != 0;
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}
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/// runPassesOn - Carefully run the specified set of pass on the specified
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/// module, returning the transformed module on success, or a null pointer on
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/// failure.
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Module *BugDriver::runPassesOn(Module *M,
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const std::vector<const PassInfo*> &Passes,
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bool AutoDebugCrashes) {
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Module *OldProgram = swapProgramIn(M);
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std::string BytecodeResult;
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if (runPasses(Passes, BytecodeResult, false/*delete*/, true/*quiet*/)) {
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if (AutoDebugCrashes) {
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cerr << " Error running this sequence of passes"
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<< " on the input program!\n";
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delete OldProgram;
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EmitProgressBytecode("pass-error", false);
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exit(debugOptimizerCrash());
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}
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swapProgramIn(OldProgram);
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return 0;
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}
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// Restore the current program.
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swapProgramIn(OldProgram);
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Module *Ret = ParseInputFile(BytecodeResult);
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if (Ret == 0) {
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cerr << getToolName() << ": Error reading bytecode file '"
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<< BytecodeResult << "'!\n";
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exit(1);
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}
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sys::Path(BytecodeResult).eraseFromDisk(); // No longer need the file on disk
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return Ret;
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}
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