#include "LTOModule.h"
#include "LTOCodeGenerator.h"
-
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Linker.h"
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
-#include "llvm/ModuleProvider.h"
#include "llvm/PassManager.h"
#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Triple.h"
#include "llvm/Analysis/Passes.h"
-#include "llvm/Analysis/LoopPass.h"
-#include "llvm/Analysis/Verifier.h"
#include "llvm/Bitcode/ReaderWriter.h"
-#include "llvm/CodeGen/FileWriters.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/FormattedStream.h"
-#include "llvm/Support/Mangler.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/StandardPasses.h"
-#include "llvm/Support/SystemUtils.h"
-#include "llvm/System/Host.h"
-#include "llvm/System/Signals.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/Target/Mangler.h"
#include "llvm/Target/SubtargetFeature.h"
#include "llvm/Target/TargetOptions.h"
-#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Target/TargetSelect.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/Scalar.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/StandardPasses.h"
+#include "llvm/Support/SystemUtils.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/Program.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/system_error.h"
#include "llvm/Config/config.h"
-
-
#include <cstdlib>
-#include <fstream>
#include <unistd.h>
#include <fcntl.h>
_linker("LinkTimeOptimizer", "ld-temp.o", _context), _target(NULL),
_emitDwarfDebugInfo(false), _scopeRestrictionsDone(false),
_codeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC),
- _nativeObjectFile(NULL), _assemblerPath(NULL)
+ _nativeObjectFile(NULL)
{
InitializeAllTargets();
InitializeAllAsmPrinters();
bool LTOCodeGenerator::addModule(LTOModule* mod, std::string& errMsg)
{
- return _linker.LinkInModule(mod->getLLVVMModule(), &errMsg);
+
+ if(mod->getLLVVMModule()->MaterializeAllPermanently(&errMsg))
+ return true;
+
+ bool ret = _linker.LinkInModule(mod->getLLVVMModule(), &errMsg);
+
+ const std::vector<const char*> &undefs = mod->getAsmUndefinedRefs();
+ for (int i = 0, e = undefs.size(); i != e; ++i)
+ _asmUndefinedRefs[undefs[i]] = 1;
+
+ return ret;
}
return true;
}
-void LTOCodeGenerator::setAssemblerPath(const char* path)
+void LTOCodeGenerator::setCpu(const char* mCpu)
{
- if ( _assemblerPath )
- delete _assemblerPath;
- _assemblerPath = new sys::Path(path);
+ _mCpu = mCpu;
}
void LTOCodeGenerator::addMustPreserveSymbol(const char* sym)
}
-bool LTOCodeGenerator::writeMergedModules(const char* path, std::string& errMsg)
-{
- if ( this->determineTarget(errMsg) )
- return true;
+bool LTOCodeGenerator::writeMergedModules(const char *path,
+ std::string &errMsg) {
+ if (determineTarget(errMsg))
+ return true;
- // mark which symbols can not be internalized
- this->applyScopeRestrictions();
+ // mark which symbols can not be internalized
+ applyScopeRestrictions();
- // create output file
- std::ofstream out(path, std::ios_base::out|std::ios::trunc|std::ios::binary);
- if ( out.fail() ) {
- errMsg = "could not open bitcode file for writing: ";
- errMsg += path;
- return true;
- }
-
- // write bitcode to it
- WriteBitcodeToFile(_linker.getModule(), out);
- if ( out.fail() ) {
- errMsg = "could not write bitcode file: ";
- errMsg += path;
- return true;
- }
+ // create output file
+ std::string ErrInfo;
+ tool_output_file Out(path, ErrInfo,
+ raw_fd_ostream::F_Binary);
+ if (!ErrInfo.empty()) {
+ errMsg = "could not open bitcode file for writing: ";
+ errMsg += path;
+ return true;
+ }
- return false;
+ // write bitcode to it
+ WriteBitcodeToFile(_linker.getModule(), Out.os());
+ Out.os().close();
+
+ if (Out.os().has_error()) {
+ errMsg = "could not write bitcode file: ";
+ errMsg += path;
+ Out.os().clear_error();
+ return true;
+ }
+
+ Out.keep();
+ return false;
}
const void* LTOCodeGenerator::compile(size_t* length, std::string& errMsg)
{
- // make unique temp .s file to put generated assembly code
- sys::Path uniqueAsmPath("lto-llvm.s");
- if ( uniqueAsmPath.createTemporaryFileOnDisk(true, &errMsg) )
- return NULL;
- sys::RemoveFileOnSignal(uniqueAsmPath);
-
- // generate assembly code
- bool genResult = false;
- {
- raw_fd_ostream asmFD(uniqueAsmPath.c_str(),
- /*Binary=*/false, /*Force=*/true,
- errMsg);
- formatted_raw_ostream asmFile(asmFD);
- if (!errMsg.empty())
- return NULL;
- genResult = this->generateAssemblyCode(asmFile, errMsg);
- }
- if ( genResult ) {
- if ( uniqueAsmPath.exists() )
- uniqueAsmPath.eraseFromDisk();
- return NULL;
- }
-
// make unique temp .o file to put generated object file
sys::PathWithStatus uniqueObjPath("lto-llvm.o");
- if ( uniqueObjPath.createTemporaryFileOnDisk(true, &errMsg) ) {
- if ( uniqueAsmPath.exists() )
- uniqueAsmPath.eraseFromDisk();
+ if ( uniqueObjPath.createTemporaryFileOnDisk(false, &errMsg) ) {
+ uniqueObjPath.eraseFromDisk();
return NULL;
}
sys::RemoveFileOnSignal(uniqueObjPath);
- // assemble the assembly code
- const std::string& uniqueObjStr = uniqueObjPath.toString();
- bool asmResult = this->assemble(uniqueAsmPath.toString(),
- uniqueObjStr, errMsg);
- if ( !asmResult ) {
- // remove old buffer if compile() called twice
- delete _nativeObjectFile;
-
- // read .o file into memory buffer
- _nativeObjectFile = MemoryBuffer::getFile(uniqueObjStr.c_str(),&errMsg);
+ // generate object file
+ bool genResult = false;
+ tool_output_file objFile(uniqueObjPath.c_str(), errMsg);
+ if (!errMsg.empty())
+ return NULL;
+ genResult = this->generateObjectFile(objFile.os(), errMsg);
+ objFile.os().close();
+ if (objFile.os().has_error()) {
+ objFile.os().clear_error();
+ return NULL;
+ }
+ objFile.keep();
+ if ( genResult ) {
+ uniqueObjPath.eraseFromDisk();
+ return NULL;
+ }
+
+ const std::string& uniqueObjStr = uniqueObjPath.str();
+ // remove old buffer if compile() called twice
+ delete _nativeObjectFile;
+
+ // read .o file into memory buffer
+ OwningPtr<MemoryBuffer> BuffPtr;
+ if (error_code ec = MemoryBuffer::getFile(uniqueObjStr.c_str(), BuffPtr,
+ -1, false)) {
+ errMsg = ec.message();
+ return NULL;
}
+ _nativeObjectFile = BuffPtr.take();
// remove temp files
- uniqueAsmPath.eraseFromDisk();
uniqueObjPath.eraseFromDisk();
// return buffer, unless error
return _nativeObjectFile->getBufferStart();
}
-
-bool LTOCodeGenerator::assemble(const std::string& asmPath,
- const std::string& objPath, std::string& errMsg)
-{
- sys::Path tool;
- bool needsCompilerOptions = true;
- if ( _assemblerPath ) {
- tool = *_assemblerPath;
- needsCompilerOptions = false;
- } else {
- // find compiler driver
- tool = sys::Program::FindProgramByName("gcc");
- if ( tool.isEmpty() ) {
- errMsg = "can't locate gcc";
- return true;
- }
- }
-
- // build argument list
- std::vector<const char*> args;
- std::string targetTriple = _linker.getModule()->getTargetTriple();
- args.push_back(tool.c_str());
- if ( targetTriple.find("darwin") != std::string::npos ) {
- // darwin specific command line options
- if (strncmp(targetTriple.c_str(), "i386-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");
- }
- else if (strncmp(targetTriple.c_str(), "arm-apple-", 10) == 0) {
- args.push_back("-arch");
- args.push_back("arm");
- }
- else if ((strncmp(targetTriple.c_str(), "armv4t-apple-", 13) == 0) ||
- (strncmp(targetTriple.c_str(), "thumbv4t-apple-", 15) == 0)) {
- args.push_back("-arch");
- args.push_back("armv4t");
- }
- else if ((strncmp(targetTriple.c_str(), "armv5-apple-", 12) == 0) ||
- (strncmp(targetTriple.c_str(), "armv5e-apple-", 13) == 0) ||
- (strncmp(targetTriple.c_str(), "thumbv5-apple-", 14) == 0) ||
- (strncmp(targetTriple.c_str(), "thumbv5e-apple-", 15) == 0)) {
- args.push_back("-arch");
- args.push_back("armv5");
- }
- else if ((strncmp(targetTriple.c_str(), "armv6-apple-", 12) == 0) ||
- (strncmp(targetTriple.c_str(), "thumbv6-apple-", 14) == 0)) {
- args.push_back("-arch");
- args.push_back("armv6");
- }
- else if ((strncmp(targetTriple.c_str(), "armv7-apple-", 12) == 0) ||
- (strncmp(targetTriple.c_str(), "thumbv7-apple-", 14) == 0)) {
- args.push_back("-arch");
- args.push_back("armv7");
- }
- // add -static to assembler command line when code model requires
- if ( (_assemblerPath != NULL) && (_codeModel == LTO_CODEGEN_PIC_MODEL_STATIC) )
- args.push_back("-static");
- }
- if ( needsCompilerOptions ) {
- args.push_back("-c");
- args.push_back("-x");
- args.push_back("assembler");
- }
- args.push_back("-o");
- args.push_back(objPath.c_str());
- args.push_back(asmPath.c_str());
- args.push_back(0);
-
- // invoke assembler
- if ( sys::Program::ExecuteAndWait(tool, &args[0], 0, 0, 0, 0, &errMsg) ) {
- errMsg = "error in assembly";
- return true;
- }
- return false; // success
-}
-
-
-
bool LTOCodeGenerator::determineTarget(std::string& errMsg)
{
if ( _target == NULL ) {
}
// construct LTModule, hand over ownership of module and target
- std::string FeatureStr = getFeatureString(Triple.c_str());
+ SubtargetFeatures Features;
+ Features.getDefaultSubtargetFeatures(_mCpu, llvm::Triple(Triple));
+ std::string FeatureStr = Features.getString();
_target = march->createTargetMachine(Triple, FeatureStr);
}
return false;
}
-void LTOCodeGenerator::applyScopeRestrictions()
-{
- if ( !_scopeRestrictionsDone ) {
- Module* mergedModule = _linker.getModule();
-
- // Start off with a verification pass.
- PassManager passes;
- passes.add(createVerifierPass());
-
- // mark which symbols can not be internalized
- if ( !_mustPreserveSymbols.empty() ) {
- Mangler mangler(*mergedModule,
- _target->getMCAsmInfo()->getGlobalPrefix());
- std::vector<const char*> mustPreserveList;
- for (Module::iterator f = mergedModule->begin(),
- e = mergedModule->end(); f != e; ++f) {
- if ( !f->isDeclaration()
- && _mustPreserveSymbols.count(mangler.getMangledName(f)) )
- mustPreserveList.push_back(::strdup(f->getNameStr().c_str()));
- }
- for (Module::global_iterator v = mergedModule->global_begin(),
- e = mergedModule->global_end(); v != e; ++v) {
- if ( !v->isDeclaration()
- && _mustPreserveSymbols.count(mangler.getMangledName(v)) )
- mustPreserveList.push_back(::strdup(v->getNameStr().c_str()));
- }
- passes.add(createInternalizePass(mustPreserveList));
- }
- // apply scope restrictions
- passes.run(*mergedModule);
-
- _scopeRestrictionsDone = true;
- }
+void LTOCodeGenerator::applyRestriction(GlobalValue &GV,
+ std::vector<const char*> &mustPreserveList,
+ SmallPtrSet<GlobalValue*, 8> &asmUsed,
+ Mangler &mangler) {
+ SmallString<64> Buffer;
+ mangler.getNameWithPrefix(Buffer, &GV, false);
+
+ if (GV.isDeclaration())
+ return;
+ if (_mustPreserveSymbols.count(Buffer))
+ mustPreserveList.push_back(GV.getName().data());
+ if (_asmUndefinedRefs.count(Buffer))
+ asmUsed.insert(&GV);
+}
+
+static void findUsedValues(GlobalVariable *LLVMUsed,
+ SmallPtrSet<GlobalValue*, 8> &UsedValues) {
+ if (LLVMUsed == 0) return;
+
+ ConstantArray *Inits = dyn_cast<ConstantArray>(LLVMUsed->getInitializer());
+ if (Inits == 0) return;
+
+ for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i)
+ if (GlobalValue *GV =
+ dyn_cast<GlobalValue>(Inits->getOperand(i)->stripPointerCasts()))
+ UsedValues.insert(GV);
+}
+
+void LTOCodeGenerator::applyScopeRestrictions() {
+ if (_scopeRestrictionsDone) return;
+ Module *mergedModule = _linker.getModule();
+
+ // Start off with a verification pass.
+ PassManager passes;
+ passes.add(createVerifierPass());
+
+ // mark which symbols can not be internalized
+ MCContext Context(*_target->getMCAsmInfo(), NULL);
+ Mangler mangler(Context, *_target->getTargetData());
+ std::vector<const char*> mustPreserveList;
+ SmallPtrSet<GlobalValue*, 8> asmUsed;
+
+ for (Module::iterator f = mergedModule->begin(),
+ e = mergedModule->end(); f != e; ++f)
+ applyRestriction(*f, mustPreserveList, asmUsed, mangler);
+ for (Module::global_iterator v = mergedModule->global_begin(),
+ e = mergedModule->global_end(); v != e; ++v)
+ applyRestriction(*v, mustPreserveList, asmUsed, mangler);
+ for (Module::alias_iterator a = mergedModule->alias_begin(),
+ e = mergedModule->alias_end(); a != e; ++a)
+ applyRestriction(*a, mustPreserveList, asmUsed, mangler);
+
+ GlobalVariable *LLVMCompilerUsed =
+ mergedModule->getGlobalVariable("llvm.compiler.used");
+ findUsedValues(LLVMCompilerUsed, asmUsed);
+ if (LLVMCompilerUsed)
+ LLVMCompilerUsed->eraseFromParent();
+
+ const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(_context);
+ std::vector<Constant*> asmUsed2;
+ for (SmallPtrSet<GlobalValue*, 16>::const_iterator i = asmUsed.begin(),
+ e = asmUsed.end(); i !=e; ++i) {
+ GlobalValue *GV = *i;
+ Constant *c = ConstantExpr::getBitCast(GV, i8PTy);
+ asmUsed2.push_back(c);
+ }
+
+ llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, asmUsed2.size());
+ LLVMCompilerUsed =
+ new llvm::GlobalVariable(*mergedModule, ATy, false,
+ llvm::GlobalValue::AppendingLinkage,
+ llvm::ConstantArray::get(ATy, asmUsed2),
+ "llvm.compiler.used");
+
+ LLVMCompilerUsed->setSection("llvm.metadata");
+
+ passes.add(createInternalizePass(mustPreserveList));
+
+ // apply scope restrictions
+ passes.run(*mergedModule);
+
+ _scopeRestrictionsDone = true;
}
/// Optimize merged modules using various IPO passes
-bool LTOCodeGenerator::generateAssemblyCode(formatted_raw_ostream& out,
- std::string& errMsg)
+bool LTOCodeGenerator::generateObjectFile(raw_ostream& out,
+ std::string& errMsg)
{
if ( this->determineTarget(errMsg) )
return true;
Module* mergedModule = _linker.getModule();
- // If target supports exception handling then enable it now.
- switch (_target->getMCAsmInfo()->getExceptionHandlingType()) {
- case ExceptionHandling::Dwarf:
- llvm::DwarfExceptionHandling = true;
- break;
- case ExceptionHandling::SjLj:
- llvm::SjLjExceptionHandling = true;
- break;
- case ExceptionHandling::None:
- break;
- default:
- assert (0 && "Unknown exception handling model!");
- }
-
// if options were requested, set them
if ( !_codegenOptions.empty() )
cl::ParseCommandLineOptions(_codegenOptions.size(),
- (char**)&_codegenOptions[0]);
+ const_cast<char **>(&_codegenOptions[0]));
// Instantiate the pass manager to organize the passes.
PassManager passes;
// Make sure everything is still good.
passes.add(createVerifierPass());
- FunctionPassManager* codeGenPasses =
- new FunctionPassManager(new ExistingModuleProvider(mergedModule));
+ FunctionPassManager* codeGenPasses = new FunctionPassManager(mergedModule);
codeGenPasses->add(new TargetData(*_target->getTargetData()));
- ObjectCodeEmitter* oce = NULL;
+ formatted_raw_ostream Out(out);
- switch (_target->addPassesToEmitFile(*codeGenPasses, out,
- TargetMachine::AssemblyFile,
- CodeGenOpt::Aggressive)) {
- case FileModel::MachOFile:
- oce = AddMachOWriter(*codeGenPasses, out, *_target);
- break;
- case FileModel::ElfFile:
- oce = AddELFWriter(*codeGenPasses, out, *_target);
- break;
- case FileModel::AsmFile:
- break;
- case FileModel::Error:
- case FileModel::None:
- errMsg = "target file type not supported";
- return true;
- }
-
- if (_target->addPassesToEmitFileFinish(*codeGenPasses, oce,
- CodeGenOpt::Aggressive)) {
- errMsg = "target does not support generation of this file type";
- return true;
+ if (_target->addPassesToEmitFile(*codeGenPasses, Out,
+ TargetMachine::CGFT_ObjectFile,
+ CodeGenOpt::Aggressive)) {
+ errMsg = "target file type not supported";
+ return true;
}
// Run our queue of passes all at once now, efficiently.
codeGenPasses->run(*it);
codeGenPasses->doFinalization();
-
- out.flush();
+ delete codeGenPasses;
return false; // success
}
/// Optimize merged modules using various IPO passes
void LTOCodeGenerator::setCodeGenDebugOptions(const char* options)
{
- std::string ops(options);
- for (std::string o = getToken(ops); !o.empty(); o = getToken(ops)) {
+ for (std::pair<StringRef, StringRef> o = getToken(options);
+ !o.first.empty(); o = getToken(o.second)) {
// ParseCommandLineOptions() expects argv[0] to be program name.
// Lazily add that.
if ( _codegenOptions.empty() )
_codegenOptions.push_back("libLTO");
- _codegenOptions.push_back(strdup(o.c_str()));
+ _codegenOptions.push_back(strdup(o.first.str().c_str()));
}
}
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