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//===- LTOBugPoint.cpp - Top-Level LTO BugPoint class ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file 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 LTO BugPoint tool to track down bit code files that cause errors.
//
//===----------------------------------------------------------------------===//
#include "LTOBugPoint.h"
#include "llvm/PassManager.h"
#include "llvm/Module.h"
#include "llvm/ModuleProvider.h"
#include "llvm/CodeGen/FileWriters.h"
#include "llvm/Target/SubtargetFeature.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetMachineRegistry.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/System/Path.h"
#include "llvm/Config/config.h"
#include <fstream>
#include <iostream>
using namespace llvm;
using namespace Reloc;
/// LTOBugPoint -- Constructor. Popuate list of linker options and
/// list of linker input files.
LTOBugPoint::LTOBugPoint(std::istream &args, std::istream &ins) {
// Read linker options. Order is important here.
std::string option;
while (getline(args, option))
LinkerOptions.push_back(option);
// Read linker input files. Order is important here.
std::string inFile;
while(getline(ins, inFile))
LinkerInputFiles.push_back(inFile);
}
/// findTroubleMakers - Find minimum set of input files that causes error
/// identified by the script.
bool
LTOBugPoint::findTroubleMakers(SmallVector<std::string, 4> &TroubleMakers,
std::string &Script) {
// First, build native object files set.
bool bitcodeFileSeen = false;
unsigned Size = LinkerInputFiles.size();
for (unsigned I = 0; I < Size; ++I) {
std::string &FileName = LinkerInputFiles[I];
sys::Path InputFile(FileName.c_str());
if (InputFile.isDynamicLibrary() || InputFile.isArchive()) {
ErrMsg = "Unable to handle input file ";
ErrMsg += FileName;
return false;
}
else if (InputFile.isBitcodeFile()) {
bitcodeFileSeen = true;
if (getNativeObjectFile(FileName) == false)
return false;
}
else
NativeInputFiles.push_back(FileName);
}
if (!bitcodeFileSeen) {
ErrMsg = "Unable to help!";
ErrMsg += " Need at least one input file that contains llvm bitcode";
return false;
}
return true;
}
/// getFeatureString - Return a string listing the features associated with the
/// target triple.
///
/// FIXME: This is an inelegant way of specifying the features of a
/// subtarget. It would be better if we could encode this information into the
/// IR.
std::string LTOBugPoint::getFeatureString(const char *TargetTriple) {
SubtargetFeatures Features;
if (strncmp(TargetTriple, "powerpc-apple-", 14) == 0) {
Features.AddFeature("altivec", true);
} else if (strncmp(TargetTriple, "powerpc64-apple-", 16) == 0) {
Features.AddFeature("64bit", true);
Features.AddFeature("altivec", true);
}
return Features.getString();
}
/// assembleBitcode - Generate assembly code from the module. Return false
/// in case of an error.
bool LTOBugPoint::assembleBitcode(llvm::Module *M, const char *AsmFileName) {
std::string TargetTriple = M->getTargetTriple();
std::string FeatureStr =
getFeatureString(TargetTriple.c_str());
const TargetMachineRegistry::entry* Registry =
TargetMachineRegistry::getClosestStaticTargetForModule(
*M, ErrMsg);
if ( Registry == NULL )
return false;
TargetMachine *Target = Registry->CtorFn(*M, FeatureStr.c_str());
// If target supports exception handling then enable it now.
if (Target->getTargetAsmInfo()->doesSupportExceptionHandling())
ExceptionHandling = true;
// FIXME
Target->setRelocationModel(Reloc::PIC_);
FunctionPassManager* CGPasses =
new FunctionPassManager(new ExistingModuleProvider(M));
CGPasses->add(new TargetData(*Target->getTargetData()));
MachineCodeEmitter* mce = NULL;
std::ofstream *Out = new std::ofstream(AsmFileName, std::ios::out);
switch (Target->addPassesToEmitFile(*CGPasses, *Out,
TargetMachine::AssemblyFile, true)) {
case FileModel::MachOFile:
mce = AddMachOWriter(*CGPasses, *Out, *Target);
break;
case FileModel::ElfFile:
mce = AddELFWriter(*CGPasses, *Out, *Target);
break;
case FileModel::AsmFile:
break;
case FileModel::Error:
case FileModel::None:
ErrMsg = "target file type not supported";
return false;
}
if (Target->addPassesToEmitFileFinish(*CGPasses, mce, true)) {
ErrMsg = "target does not support generation of this file type";
return false;
}
CGPasses->doInitialization();
for (Module::iterator
it = M->begin(), e = M->end(); it != e; ++it)
if (!it->isDeclaration())
CGPasses->run(*it);
CGPasses->doFinalization();
delete Out;
return true;
}
/// getNativeObjectFile - Generate native object file based from llvm
/// bitcode file. Return false in case of an error.
bool LTOBugPoint::getNativeObjectFile(std::string &FileName) {
std::auto_ptr<Module> M;
MemoryBuffer *Buffer
= MemoryBuffer::getFile(FileName.c_str(), &ErrMsg);
if (!Buffer) {
ErrMsg = "Unable to read ";
ErrMsg += FileName;
return false;
}
M.reset(ParseBitcodeFile(Buffer, &ErrMsg));
std::string TargetTriple = M->getTargetTriple();
sys::Path AsmFile(sys::Path::GetTemporaryDirectory());
if(AsmFile.createTemporaryFileOnDisk(false, &ErrMsg))
return false;
if (assembleBitcode(M.get(), AsmFile.c_str()) == false)
return false;
sys::Path NativeFile(sys::Path::GetTemporaryDirectory());
if(NativeFile.createTemporaryFileOnDisk(false, &ErrMsg))
return false;
// find compiler driver
const sys::Path gcc = sys::Program::FindProgramByName("gcc");
if ( gcc.isEmpty() ) {
ErrMsg = "can't locate gcc";
return false;
}
// build argument list
std::vector<const char*> args;
args.push_back(gcc.c_str());
if ( TargetTriple.find("darwin") != TargetTriple.size() ) {
if (strncmp(TargetTriple.c_str(), "i686-apple-", 11) == 0) {
args.push_back("-arch");
args.push_back("i386");
}
else if (strncmp(TargetTriple.c_str(), "x86_64-apple-", 13) == 0) {
args.push_back("-arch");
args.push_back("x86_64");
}
else if (strncmp(TargetTriple.c_str(), "powerpc-apple-", 14) == 0) {
args.push_back("-arch");
args.push_back("ppc");
}
else if (strncmp(TargetTriple.c_str(), "powerpc64-apple-", 16) == 0) {
args.push_back("-arch");
args.push_back("ppc64");
}
}
args.push_back("-c");
args.push_back("-x");
args.push_back("assembler");
args.push_back("-o");
args.push_back(NativeFile.c_str());
args.push_back(AsmFile.c_str());
args.push_back(0);
// invoke assembler
if (sys::Program::ExecuteAndWait(gcc, &args[0], 0, 0, 0, 0, &ErrMsg)) {
ErrMsg = "error in assembly";
return false;
}
return true;
}
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