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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13477 91177308-0d34-0410-b5e6-96231b3b80d8
197 lines
6.6 KiB
C++
197 lines
6.6 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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#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 "Support/FileUtilities.h"
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#include <fstream>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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using namespace llvm;
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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::ofstream Out(Filename.c_str());
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if (!Out.good()) return true;
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WriteBytecodeToFile(M ? M : Program, Out);
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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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std::cerr << "Error opening file '" << Filename << "' for writing!\n";
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return;
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}
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std::cout << "Emitted bytecode to '" << Filename << "'\n";
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if (NoFlyer || PassesToRun.empty()) return;
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std::cout << "\n*** You can reproduce the problem with: ";
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unsigned PassType = PassesToRun[0]->getPassType();
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for (unsigned i = 1, e = PassesToRun.size(); i != e; ++i)
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PassType &= PassesToRun[i]->getPassType();
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if (PassType & PassInfo::Analysis)
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std::cout << "analyze";
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else if (PassType & PassInfo::Optimization)
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std::cout << "opt";
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else if (PassType & PassInfo::LLC)
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std::cout << "llc";
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else
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std::cout << "bugpoint";
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std::cout << " " << Filename << " ";
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std::cout << getPassesString(PassesToRun) << "\n";
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}
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static void RunChild(Module *Program,const std::vector<const PassInfo*> &Passes,
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const std::string &OutFilename) {
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std::ofstream OutFile(OutFilename.c_str());
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if (!OutFile.good()) {
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std::cerr << "Error opening bytecode file: " << OutFilename << "\n";
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exit(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("bugpoint", 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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std::cerr << "Cannot create pass yet: " << Passes[i]->getPassName()
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<< "\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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PM.add(new WriteBytecodePass(&OutFile));
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// Run all queued passes.
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PM.run(*Program);
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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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std::cout << std::flush;
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OutputFilename = getUniqueFilename("bugpoint-output.bc");
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pid_t child_pid;
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switch (child_pid = fork()) {
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case -1: // Error occurred
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std::cerr << ToolName << ": Error forking!\n";
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exit(1);
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case 0: // Child process runs passes.
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RunChild(Program, Passes, OutputFilename);
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exit(0); // If we finish successfully, return 0!
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default: // Parent continues...
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break;
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}
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// Wait for the child process to get done.
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int Status;
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if (wait(&Status) != child_pid) {
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std::cerr << "Error waiting for child process!\n";
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exit(1);
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}
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bool ExitedOK = WIFEXITED(Status) && WEXITSTATUS(Status) == 0;
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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 || !ExitedOK)
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removeFile(OutputFilename);
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if (!Quiet) {
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if (ExitedOK)
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std::cout << "Success!\n";
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else if (WIFEXITED(Status))
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std::cout << "Exited with error code '" << WEXITSTATUS(Status) << "'\n";
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else if (WIFSIGNALED(Status))
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std::cout << "Crashed with signal #" << WTERMSIG(Status) << "\n";
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#ifdef WCOREDUMP
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else if (WCOREDUMP(Status))
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std::cout << "Dumped core\n";
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#endif
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else
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std::cout << "Failed for unknown reason!\n";
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}
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// Was the child successful?
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return !ExitedOK;
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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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std::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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std::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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removeFile(BytecodeResult); // No longer need the file on disk
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return Ret;
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}
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