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//===- BugDriver.cpp - Top-Level BugPoint class implementation ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class contains all of the shared state and information that is used by
// the BugPoint tool to track down errors in optimizations. This class is the
// main driver class that invokes all sub-functionality.
//
//===----------------------------------------------------------------------===//
#include "BugDriver.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Assembly/Parser.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Support/Linker.h"
#include "llvm/Support/ToolRunner.h"
#include "Support/CommandLine.h"
#include "Support/FileUtilities.h"
#include <iostream>
#include <memory>
using namespace llvm;
// Anonymous namespace to define command line options for debugging.
//
namespace {
// Output - The user can specify a file containing the expected output of the
// program. If this filename is set, it is used as the reference diff source,
// otherwise the raw input run through an interpreter is used as the reference
// source.
//
cl::opt<std::string>
OutputFile("output", cl::desc("Specify a reference program output "
"(for miscompilation detection)"));
}
/// setNewProgram - If we reduce or update the program somehow, call this method
/// to update bugdriver with it. This deletes the old module and sets the
/// specified one as the current program.
void BugDriver::setNewProgram(Module *M) {
delete Program;
Program = M;
}
/// getPassesString - Turn a list of passes into a string which indicates the
/// command line options that must be passed to add the passes.
///
std::string llvm::getPassesString(const std::vector<const PassInfo*> &Passes) {
std::string Result;
for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
if (i) Result += " ";
Result += "-";
Result += Passes[i]->getPassArgument();
}
return Result;
}
BugDriver::BugDriver(const char *toolname)
: ToolName(toolname), ReferenceOutputFile(OutputFile),
Program(0), Interpreter(0), cbe(0), gcc(0) {}
/// ParseInputFile - Given a bytecode or assembly input filename, parse and
/// return it, or return null if not possible.
///
Module *llvm::ParseInputFile(const std::string &InputFilename) {
Module *Result = 0;
try {
Result = ParseBytecodeFile(InputFilename);
if (!Result && !(Result = ParseAssemblyFile(InputFilename))){
std::cerr << "bugpoint: could not read input file '"
<< InputFilename << "'!\n";
}
} catch (const ParseException &E) {
std::cerr << "bugpoint: " << E.getMessage() << '\n';
Result = 0;
}
return Result;
}
// This method takes the specified list of LLVM input files, attempts to load
// them, either as assembly or bytecode, then link them together. It returns
// true on failure (if, for example, an input bytecode file could not be
// parsed), and false on success.
//
bool BugDriver::addSources(const std::vector<std::string> &Filenames) {
assert(Program == 0 && "Cannot call addSources multiple times!");
assert(!Filenames.empty() && "Must specify at least on input filename!");
// Load the first input file...
Program = ParseInputFile(Filenames[0]);
if (Program == 0) return true;
std::cout << "Read input file : '" << Filenames[0] << "'\n";
for (unsigned i = 1, e = Filenames.size(); i != e; ++i) {
std::auto_ptr<Module> M(ParseInputFile(Filenames[i]));
if (M.get() == 0) return true;
std::cout << "Linking in input file: '" << Filenames[i] << "'\n";
std::string ErrorMessage;
if (LinkModules(Program, M.get(), &ErrorMessage)) {
std::cerr << ToolName << ": error linking in '" << Filenames[i] << "': "
<< ErrorMessage << '\n';
return true;
}
}
std::cout << "*** All input ok\n";
// All input files read successfully!
return false;
}
/// run - The top level method that is invoked after all of the instance
/// variables are set up from command line arguments.
///
bool BugDriver::run() {
// The first thing that we must do is determine what the problem is. Does the
// optimization series crash the compiler, or does it produce illegal code?
// We make the top-level decision by trying to run all of the passes on the
// the input program, which should generate a bytecode file. If it does
// generate a bytecode file, then we know the compiler didn't crash, so try
// to diagnose a miscompilation.
if (!PassesToRun.empty()) {
std::cout << "Running selected passes on program to test for crash: ";
if (runPasses(PassesToRun))
return debugOptimizerCrash();
}
// Set up the execution environment, selecting a method to run LLVM bytecode.
if (initializeExecutionEnvironment()) return true;
// Test to see if we have a code generator crash.
std::cout << "Running the code generator to test for a crash: ";
try {
compileProgram(Program);
std::cout << '\n';
} catch (ToolExecutionError &TEE) {
std::cout << TEE.what();
return debugCodeGeneratorCrash();
}
// Run the raw input to see where we are coming from. If a reference output
// was specified, make sure that the raw output matches it. If not, it's a
// problem in the front-end or the code generator.
//
bool CreatedOutput = false;
if (ReferenceOutputFile.empty()) {
std::cout << "Generating reference output from raw program: ";
try {
ReferenceOutputFile = executeProgramWithCBE("bugpoint.reference.out");
CreatedOutput = true;
std::cout << "Reference output is: " << ReferenceOutputFile << '\n';
} catch (ToolExecutionError &TEE) {
std::cerr << TEE.what();
if (Interpreter != cbe) {
std::cerr << "*** There is a bug running the C backend. Either debug"
<< " it (use the -run-cbe bugpoint option), or fix the error"
<< " some other way.\n";
return 1;
}
return debugCodeGeneratorCrash();
}
}
// Make sure the reference output file gets deleted on exit from this
// function, if appropriate.
FileRemover RemoverInstance(ReferenceOutputFile, CreatedOutput);
// Diff the output of the raw program against the reference output. If it
// matches, then we have a miscompilation bug.
std::cout << "*** Checking the code generator...\n";
try {
if (!diffProgram()) {
std::cout << "\n*** Debugging miscompilation!\n";
return debugMiscompilation();
}
} catch (ToolExecutionError &TEE) {
std::cerr << TEE.what();
return debugCodeGeneratorCrash();
}
std::cout << "\n*** Input program does not match reference diff!\n";
std::cout << "Debugging code generator problem!\n";
try {
return debugCodeGenerator();
} catch (ToolExecutionError &TEE) {
std::cerr << TEE.what();
return debugCodeGeneratorCrash();
}
}
void llvm::PrintFunctionList(const std::vector<Function*> &Funcs) {
unsigned NumPrint = Funcs.size();
if (NumPrint > 10) NumPrint = 10;
for (unsigned i = 0; i != NumPrint; ++i)
std::cout << " " << Funcs[i]->getName();
if (NumPrint < Funcs.size())
std::cout << "... <" << Funcs.size() << " total>";
std::cout << std::flush;
}
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