294 lines
9.9 KiB
C++
294 lines
9.9 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 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/Bitcode/ReaderWriter.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Program.h"
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#include "llvm/Support/SystemUtils.h"
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#include "llvm/Support/ToolOutputFile.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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#define DEBUG_TYPE "bugpoint"
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namespace llvm {
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extern cl::opt<std::string> OutputPrefix;
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}
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static cl::opt<bool> PreserveBitcodeUseListOrder(
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"preserve-bc-uselistorder",
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cl::desc("Preserve use-list order when writing LLVM bitcode."),
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cl::init(true), cl::Hidden);
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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<std::string> OptCmd("opt-command", cl::init(""),
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cl::desc("Path to opt. (default: search path "
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"for 'opt'.)"));
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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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static bool writeProgramToFileAux(tool_output_file &Out, const Module *M) {
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WriteBitcodeToFile(M, Out.os(), PreserveBitcodeUseListOrder);
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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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return true;
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}
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bool BugDriver::writeProgramToFile(const std::string &Filename, int FD,
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const Module *M) const {
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tool_output_file Out(Filename, FD);
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return writeProgramToFileAux(Out, M);
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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::error_code EC;
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tool_output_file Out(Filename, EC, sys::fs::F_None);
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if (!EC)
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return writeProgramToFileAux(Out, M);
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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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SmallString<128> UniqueFilename;
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std::error_code EC = sys::fs::createUniqueFile(
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OutputPrefix + "-output-%%%%%%%.bc", UniqueFilename);
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if (EC) {
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errs() << getToolName() << ": Error making unique filename: "
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<< EC.message() << "\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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SmallString<128> InputFilename;
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int InputFD;
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EC = sys::fs::createUniqueFile(OutputPrefix + "-input-%%%%%%%.bc", InputFD,
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InputFilename);
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if (EC) {
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errs() << getToolName() << ": Error making unique filename: "
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<< EC.message() << "\n";
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return 1;
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}
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tool_output_file InFile(InputFilename, InputFD);
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WriteBitcodeToFile(Program, InFile.os(), PreserveBitcodeUseListOrder);
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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 << "\n";
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InFile.os().clear_error();
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return 1;
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}
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std::string tool = OptCmd;
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if (OptCmd.empty()) {
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if (ErrorOr<std::string> Path = sys::findProgramByName("opt"))
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tool = *Path;
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else
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errs() << Path.getError().message() << "\n";
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}
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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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std::string Prog;
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if (UseValgrind) {
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if (ErrorOr<std::string> Path = sys::findProgramByName("valgrind"))
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Prog = *Path;
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else
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errs() << Path.getError().message() << "\n";
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} else
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Prog = tool;
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if (Prog.empty()) {
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errs() << "Cannot find `valgrind' 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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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(tool.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(nullptr);
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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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// Redirect stdout and stderr to nowhere if SilencePasses is given
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StringRef Nowhere;
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const StringRef *Redirects[3] = {nullptr, &Nowhere, &Nowhere};
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std::string ErrMsg;
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int result = sys::ExecuteAndWait(Prog, Args.data(), nullptr,
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(SilencePasses ? Redirects : nullptr),
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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::fs::remove(OutputFilename);
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// Remove the temporary input file as well
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sys::fs::remove(InputFilename.c_str());
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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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std::unique_ptr<Module>
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BugDriver::runPassesOn(Module *M, 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 nullptr;
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}
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std::unique_ptr<Module> Ret = parseInputFile(BitcodeResult, Context);
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if (!Ret) {
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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::fs::remove(BitcodeResult);
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return Ret;
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}
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