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just argv[0]. And remove the code for searching the current working directory and for searching PATH; the point of FindExecutable is not to find whatever version of the executable can be found by searching around, but to find an executable that accompanies the current executable. Update the tools to use sys::Program::FindProgramByName when they want PATH searching. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78240 91177308-0d34-0410-b5e6-96231b3b80d8
266 lines
9.3 KiB
C++
266 lines
9.3 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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// 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/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/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 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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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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WriteBitcodeToFile(M ? M : Program, Out);
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return false;
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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 std::string &ID, bool NoFlyer) {
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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 = "bugpoint-" + ID + ".bc";
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if (writeProgramToFile(Filename)) {
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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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outs() << "opt " << Filename << " ";
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outs() << 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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errs() << "Error opening bitcode 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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errs() << "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 bitcode out to disk as the last step...
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PM.add(CreateBitcodeWriterPass(OutFile));
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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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cl::opt<bool> SilencePasses("silence-passes", cl::desc("Suppress output of running passes (both stdout and stderr)"));
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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(const std::vector<const PassInfo*> &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("bugpoint-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.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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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::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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errs() << "Error opening bitcode file: " << inputFilename << "\n";
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return(1);
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}
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WriteBitcodeToFile(Program, InFile);
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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()+NumExtraArgs));
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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;
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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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for (unsigned i = 0; i < NumExtraArgs; ++i)
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args[n++] = *ExtraArgs;
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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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// 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, 0, (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 with signal #" << abs(result) << "\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<const PassInfo*> &Passes,
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bool AutoDebugCrashes, unsigned NumExtraArgs,
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const char * const *ExtraArgs) {
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Module *OldProgram = swapProgramIn(M);
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std::string BitcodeResult;
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if (runPasses(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 OldProgram;
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EmitProgressBitcode("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(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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