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e3575252ce
1) opt is not usually in the same path as the target program. Even for the bugpoint as a standalone app, it should be more portable to search in PATH, isn't it? 2) bugpoint driver accounts opt plugins, but does not list them in the final output command. Patch by Dmitry Mikushin! llvm-svn: 153066
268 lines
9.2 KiB
C++
268 lines
9.2 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 is distributed under the University of Illinois Open Source
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// 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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#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/Bitcode/ReaderWriter.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/SystemUtils.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Program.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 llvm {
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extern cl::opt<std::string> OutputPrefix;
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}
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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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}
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/// writeProgramToFile - This writes the current "Program" to the named bitcode
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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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const Module *M) const {
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std::string ErrInfo;
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tool_output_file Out(Filename.c_str(), ErrInfo,
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raw_fd_ostream::F_Binary);
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if (ErrInfo.empty()) {
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WriteBitcodeToFile(M, Out.os());
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Out.os().close();
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if (!Out.os().has_error()) {
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Out.keep();
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return false;
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}
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}
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Out.os().clear_error();
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return true;
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}
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/// EmitProgressBitcode - 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::EmitProgressBitcode(const Module *M,
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const std::string &ID,
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bool NoFlyer) const {
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// Output the input to the current pass to a bitcode 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 = OutputPrefix + "-" + ID + ".bc";
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if (writeProgramToFile(Filename, M)) {
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errs() << "Error opening file '" << Filename << "' for writing!\n";
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return;
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}
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outs() << "Emitted bitcode to '" << Filename << "'\n";
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if (NoFlyer || PassesToRun.empty()) return;
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outs() << "\n*** You can reproduce the problem with: ";
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if (UseValgrind) outs() << "valgrind ";
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outs() << "opt " << Filename;
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for (unsigned i = 0, e = PluginLoader::getNumPlugins(); i != e; ++i) {
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outs() << " -load " << PluginLoader::getPlugin(i);
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}
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outs() << " " << getPassesString(PassesToRun) << "\n";
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}
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cl::opt<bool> SilencePasses("silence-passes",
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cl::desc("Suppress output of running passes (both stdout and stderr)"));
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static cl::list<std::string> OptArgs("opt-args", cl::Positional,
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cl::desc("<opt arguments>..."),
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cl::ZeroOrMore, cl::PositionalEatsArgs);
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/// runPasses - Run the specified passes on Program, outputting a bitcode 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 bitcode is
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/// deleted on success, and the filename string is undefined. This prints to
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/// outs() a single line message indicating whether compilation was successful
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/// or failed.
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///
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bool BugDriver::runPasses(Module *Program,
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const std::vector<std::string> &Passes,
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std::string &OutputFilename, bool DeleteOutput,
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bool Quiet, unsigned NumExtraArgs,
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const char * const *ExtraArgs) const {
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// setup the output file name
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outs().flush();
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sys::Path uniqueFilename(OutputPrefix + "-output.bc");
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std::string ErrMsg;
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if (uniqueFilename.makeUnique(true, &ErrMsg)) {
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errs() << 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.str();
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// set up the input file name
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sys::Path inputFilename(OutputPrefix + "-input.bc");
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if (inputFilename.makeUnique(true, &ErrMsg)) {
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errs() << 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::string ErrInfo;
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tool_output_file InFile(inputFilename.c_str(), ErrInfo,
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raw_fd_ostream::F_Binary);
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if (!ErrInfo.empty()) {
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errs() << "Error opening bitcode file: " << inputFilename.str() << "\n";
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return 1;
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}
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WriteBitcodeToFile(Program, InFile.os());
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InFile.os().close();
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if (InFile.os().has_error()) {
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errs() << "Error writing bitcode file: " << inputFilename.str() << "\n";
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InFile.os().clear_error();
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return 1;
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}
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sys::Path tool = sys::Program::FindProgramByName("opt");
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if (tool.empty()) {
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errs() << "Cannot find `opt' in PATH!\n";
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return 1;
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}
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// Ok, everything that could go wrong before running opt is done.
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InFile.keep();
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// setup the child process' arguments
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SmallVector<const char*, 8> Args;
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std::string Opt = tool.str();
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if (UseValgrind) {
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Args.push_back("valgrind");
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Args.push_back("--error-exitcode=1");
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Args.push_back("-q");
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Args.push_back(tool.c_str());
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} else
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Args.push_back(Opt.c_str());
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Args.push_back("-o");
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Args.push_back(OutputFilename.c_str());
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for (unsigned i = 0, e = OptArgs.size(); i != e; ++i)
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Args.push_back(OptArgs[i].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<std::string>::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) );
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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.push_back(I->c_str());
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Args.push_back(inputFilename.c_str());
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for (unsigned i = 0; i < NumExtraArgs; ++i)
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Args.push_back(*ExtraArgs);
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Args.push_back(0);
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DEBUG(errs() << "\nAbout to run:\t";
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for (unsigned i = 0, e = Args.size()-1; i != e; ++i)
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errs() << " " << Args[i];
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errs() << "\n";
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);
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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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// Redirect stdout and stderr to nowhere if SilencePasses is given
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sys::Path Nowhere;
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const sys::Path *Redirects[3] = {0, &Nowhere, &Nowhere};
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int result = sys::Program::ExecuteAndWait(prog, Args.data(), 0,
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(SilencePasses ? Redirects : 0),
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Timeout, MemoryLimit, &ErrMsg);
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// If we are supposed to delete the bitcode 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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outs() << "Success!\n";
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else if (result > 0)
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outs() << "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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outs() << "Execute failed: " << ErrMsg << "\n";
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else
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outs() << "Crashed: " << ErrMsg << "\n";
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}
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if (result & 0x01000000)
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outs() << "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<std::string> &Passes,
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bool AutoDebugCrashes, unsigned NumExtraArgs,
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const char * const *ExtraArgs) {
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std::string BitcodeResult;
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if (runPasses(M, Passes, BitcodeResult, false/*delete*/, true/*quiet*/,
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NumExtraArgs, ExtraArgs)) {
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if (AutoDebugCrashes) {
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errs() << " Error running this sequence of passes"
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<< " on the input program!\n";
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delete swapProgramIn(M);
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EmitProgressBitcode(M, "pass-error", false);
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exit(debugOptimizerCrash());
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}
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return 0;
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}
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Module *Ret = ParseInputFile(BitcodeResult, Context);
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if (Ret == 0) {
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errs() << getToolName() << ": Error reading bitcode file '"
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<< BitcodeResult << "'!\n";
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exit(1);
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}
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sys::Path(BitcodeResult).eraseFromDisk(); // No longer need the file on disk
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return Ret;
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}
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