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directory. These passes are already defined in the IR library, and it doesn't make any sense to have the headers in Analysis. Long term, I think there is going to be a much better way to divide these matters. The dominators code should be fully separated into the abstract graph algorithm and have that put in Support where it becomes obvious that evn Clang's CFGBlock's can use it. Then the verifier can manually construct dominance information from the Support-driven interface while the Analysis library can provide a pass which both caches, reconstructs, and supports a nice update API. But those are very long term, and so I don't want to leave the really confusing structure until that day arrives. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199082 91177308-0d34-0410-b5e6-96231b3b80d8
277 lines
9.5 KiB
C++
277 lines
9.5 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/Module.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/PassManager.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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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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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());
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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.c_str(), 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::string ErrInfo;
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tool_output_file Out(Filename.c_str(), ErrInfo, sys::fs::F_Binary);
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if (ErrInfo.empty())
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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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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.c_str(), InputFD);
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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 << "\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.empty()? sys::FindProgramByName("opt") : OptCmd;
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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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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(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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std::string Prog;
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if (UseValgrind)
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Prog = sys::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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StringRef Nowhere;
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const StringRef *Redirects[3] = {0, &Nowhere, &Nowhere};
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std::string ErrMsg;
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int result = sys::ExecuteAndWait(Prog, Args.data(), 0,
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(SilencePasses ? Redirects : 0), Timeout,
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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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/// 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::fs::remove(BitcodeResult);
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return Ret;
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}
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