//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
-// This file implements the Link Time Optimization library. This library is
+// This file implements the Link Time Optimization library. This library is
// intended to be used by linker to optimize code at link time.
//
//===----------------------------------------------------------------------===//
-#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/PassManager.h"
+#include "LTOModule.h"
#include "llvm/ADT/StringExtras.h"
-#include "llvm/ADT/Triple.h"
#include "llvm/Analysis/Passes.h"
+#include "llvm/Analysis/Verifier.h"
#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Config/config.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Linker.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/SubtargetFeature.h"
-#include "llvm/Target/Mangler.h"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Target/TargetRegistry.h"
-#include "llvm/Target/TargetSelect.h"
+#include "llvm/PassManager.h"
#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FormattedStream.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/PassManagerBuilder.h"
-#include "llvm/Support/SystemUtils.h"
-#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/Host.h"
-#include "llvm/Support/Program.h"
+#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Signals.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/system_error.h"
-#include "llvm/Config/config.h"
-#include <cstdlib>
-#include <unistd.h>
-#include <fcntl.h>
-
-
+#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/IPO/PassManagerBuilder.h"
+#include "llvm/Transforms/ObjCARC.h"
using namespace llvm;
-static cl::opt<bool> DisableInline("disable-inlining",
+static cl::opt<bool>
+DisableOpt("disable-opt", cl::init(false),
+ cl::desc("Do not run any optimization passes"));
+
+static cl::opt<bool>
+DisableInline("disable-inlining", cl::init(false),
cl::desc("Do not run the inliner pass"));
+static cl::opt<bool>
+DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
+ cl::desc("Do not run the GVN load PRE pass"));
-const char* LTOCodeGenerator::getVersionString()
-{
+const char* LTOCodeGenerator::getVersionString() {
#ifdef LLVM_VERSION_INFO
- return PACKAGE_NAME " version " PACKAGE_VERSION ", " LLVM_VERSION_INFO;
+ return PACKAGE_NAME " version " PACKAGE_VERSION ", " LLVM_VERSION_INFO;
#else
- return PACKAGE_NAME " version " PACKAGE_VERSION;
+ return PACKAGE_NAME " version " PACKAGE_VERSION;
#endif
}
-
-LTOCodeGenerator::LTOCodeGenerator()
- : _context(getGlobalContext()),
- _linker("LinkTimeOptimizer", "ld-temp.o", _context), _target(NULL),
- _emitDwarfDebugInfo(false), _scopeRestrictionsDone(false),
- _codeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC),
- _nativeObjectFile(NULL)
-{
- InitializeAllTargets();
- InitializeAllMCAsmInfos();
- InitializeAllMCCodeGenInfos();
- InitializeAllMCRegisterInfos();
- InitializeAllMCSubtargetInfos();
- InitializeAllAsmPrinters();
-}
-
-LTOCodeGenerator::~LTOCodeGenerator()
-{
- delete _target;
- delete _nativeObjectFile;
+LTOCodeGenerator::LTOCodeGenerator()
+ : _context(getGlobalContext()),
+ _linker(new Module("ld-temp.o", _context)), _target(NULL),
+ _emitDwarfDebugInfo(false), _scopeRestrictionsDone(false),
+ _codeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC),
+ _nativeObjectFile(NULL) {
+ InitializeAllTargets();
+ InitializeAllTargetMCs();
+ InitializeAllAsmPrinters();
}
+LTOCodeGenerator::~LTOCodeGenerator() {
+ delete _target;
+ delete _nativeObjectFile;
+ delete _linker.getModule();
+ for (std::vector<char*>::iterator I = _codegenOptions.begin(),
+ E = _codegenOptions.end(); I != E; ++I)
+ free(*I);
+}
-bool LTOCodeGenerator::addModule(LTOModule* mod, std::string& errMsg)
-{
-
- if(mod->getLLVVMModule()->MaterializeAllPermanently(&errMsg))
- return true;
-
- bool ret = _linker.LinkInModule(mod->getLLVVMModule(), &errMsg);
+bool LTOCodeGenerator::addModule(LTOModule* mod, std::string& errMsg) {
+ 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)
return ret;
}
-
-
-bool LTOCodeGenerator::setDebugInfo(lto_debug_model debug, std::string& errMsg)
-{
- switch (debug) {
- case LTO_DEBUG_MODEL_NONE:
- _emitDwarfDebugInfo = false;
- return false;
-
- case LTO_DEBUG_MODEL_DWARF:
- _emitDwarfDebugInfo = true;
- return false;
- }
- errMsg = "unknown debug format";
- return true;
-}
+bool LTOCodeGenerator::setDebugInfo(lto_debug_model debug,
+ std::string& errMsg) {
+ switch (debug) {
+ case LTO_DEBUG_MODEL_NONE:
+ _emitDwarfDebugInfo = false;
+ return false;
-bool LTOCodeGenerator::setCodePICModel(lto_codegen_model model,
- std::string& errMsg)
-{
- switch (model) {
- case LTO_CODEGEN_PIC_MODEL_STATIC:
- case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
- case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
- _codeModel = model;
- return false;
- }
- errMsg = "unknown pic model";
- return true;
-}
-
-void LTOCodeGenerator::setCpu(const char* mCpu)
-{
- _mCpu = mCpu;
+ case LTO_DEBUG_MODEL_DWARF:
+ _emitDwarfDebugInfo = true;
+ return false;
+ }
+ llvm_unreachable("Unknown debug format!");
}
-void LTOCodeGenerator::addMustPreserveSymbol(const char* sym)
-{
- _mustPreserveSymbols[sym] = 1;
+bool LTOCodeGenerator::setCodePICModel(lto_codegen_model model,
+ std::string& errMsg) {
+ switch (model) {
+ case LTO_CODEGEN_PIC_MODEL_STATIC:
+ case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
+ case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
+ _codeModel = model;
+ return false;
+ }
+ llvm_unreachable("Unknown PIC model!");
}
-
bool LTOCodeGenerator::writeMergedModules(const char *path,
std::string &errMsg) {
if (determineTarget(errMsg))
return true;
- // mark which symbols can not be internalized
+ // mark which symbols can not be internalized
applyScopeRestrictions();
// create output file
errMsg += path;
return true;
}
-
+
// write bitcode to it
WriteBitcodeToFile(_linker.getModule(), Out.os());
Out.os().close();
Out.os().clear_error();
return true;
}
-
+
Out.keep();
return false;
}
-
-bool LTOCodeGenerator::compile_to_file(const char** name, std::string& errMsg)
-{
+bool LTOCodeGenerator::compile_to_file(const char** name, std::string& errMsg) {
// make unique temp .o file to put generated object file
- sys::PathWithStatus uniqueObjPath("lto-llvm.o");
- if ( uniqueObjPath.createTemporaryFileOnDisk(false, &errMsg) ) {
- uniqueObjPath.eraseFromDisk();
+ SmallString<128> Filename;
+ int FD;
+ error_code EC = sys::fs::unique_file("lto-llvm-%%%%%%%.o",
+ FD, Filename);
+ if (EC) {
+ errMsg = EC.message();
return true;
}
- sys::RemoveFileOnSignal(uniqueObjPath);
// 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);
+ tool_output_file objFile(Filename.c_str(), FD);
+
+ bool genResult = generateObjectFile(objFile.os(), errMsg);
objFile.os().close();
if (objFile.os().has_error()) {
objFile.os().clear_error();
+ sys::fs::remove(Twine(Filename));
return true;
}
+
objFile.keep();
- if ( genResult ) {
- uniqueObjPath.eraseFromDisk();
+ if (genResult) {
+ sys::fs::remove(Twine(Filename));
return true;
}
- _nativeObjectPath = uniqueObjPath.str();
+ _nativeObjectPath = Filename.c_str();
*name = _nativeObjectPath.c_str();
return false;
}
-const void* LTOCodeGenerator::compile(size_t* length, std::string& errMsg)
-{
+const void* LTOCodeGenerator::compile(size_t* length, std::string& errMsg) {
const char *name;
if (compile_to_file(&name, errMsg))
return NULL;
OwningPtr<MemoryBuffer> BuffPtr;
if (error_code ec = MemoryBuffer::getFile(name, BuffPtr, -1, false)) {
errMsg = ec.message();
+ sys::fs::remove(_nativeObjectPath);
return NULL;
}
_nativeObjectFile = BuffPtr.take();
// remove temp files
- sys::Path(_nativeObjectPath).eraseFromDisk();
+ sys::fs::remove(_nativeObjectPath);
// return buffer, unless error
- if ( _nativeObjectFile == NULL )
+ if (_nativeObjectFile == NULL)
return NULL;
*length = _nativeObjectFile->getBufferSize();
return _nativeObjectFile->getBufferStart();
}
-bool LTOCodeGenerator::determineTarget(std::string& errMsg)
-{
- if ( _target == NULL ) {
- std::string Triple = _linker.getModule()->getTargetTriple();
- if (Triple.empty())
- Triple = sys::getHostTriple();
-
- // create target machine from info for merged modules
- const Target *march = TargetRegistry::lookupTarget(Triple, errMsg);
- if ( march == NULL )
- return true;
-
- // The relocation model is actually a static member of TargetMachine
- // and needs to be set before the TargetMachine is instantiated.
- Reloc::Model RelocModel = Reloc::Default;
- switch( _codeModel ) {
- case LTO_CODEGEN_PIC_MODEL_STATIC:
- RelocModel = Reloc::Static;
- break;
- case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
- RelocModel = Reloc::PIC_;
- break;
- case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
- RelocModel = Reloc::DynamicNoPIC;
- break;
- }
-
- // construct LTModule, hand over ownership of module and target
- SubtargetFeatures Features;
- Features.getDefaultSubtargetFeatures(llvm::Triple(Triple));
- std::string FeatureStr = Features.getString();
- _target = march->createTargetMachine(Triple, _mCpu, FeatureStr,
- RelocModel);
- }
+bool LTOCodeGenerator::determineTarget(std::string &errMsg) {
+ if (_target != NULL)
return false;
+
+ // if options were requested, set them
+ if (!_codegenOptions.empty())
+ cl::ParseCommandLineOptions(_codegenOptions.size(),
+ const_cast<char **>(&_codegenOptions[0]));
+
+ std::string TripleStr = _linker.getModule()->getTargetTriple();
+ if (TripleStr.empty())
+ TripleStr = sys::getDefaultTargetTriple();
+ llvm::Triple Triple(TripleStr);
+
+ // create target machine from info for merged modules
+ const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
+ if (march == NULL)
+ return true;
+
+ // The relocation model is actually a static member of TargetMachine and
+ // needs to be set before the TargetMachine is instantiated.
+ Reloc::Model RelocModel = Reloc::Default;
+ switch (_codeModel) {
+ case LTO_CODEGEN_PIC_MODEL_STATIC:
+ RelocModel = Reloc::Static;
+ break;
+ case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
+ RelocModel = Reloc::PIC_;
+ break;
+ case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
+ RelocModel = Reloc::DynamicNoPIC;
+ break;
+ }
+
+ // construct LTOModule, hand over ownership of module and target
+ SubtargetFeatures Features;
+ Features.getDefaultSubtargetFeatures(Triple);
+ std::string FeatureStr = Features.getString();
+ // Set a default CPU for Darwin triples.
+ if (_mCpu.empty() && Triple.isOSDarwin()) {
+ if (Triple.getArch() == llvm::Triple::x86_64)
+ _mCpu = "core2";
+ else if (Triple.getArch() == llvm::Triple::x86)
+ _mCpu = "yonah";
+ }
+ TargetOptions Options;
+ LTOModule::getTargetOptions(Options);
+ _target = march->createTargetMachine(TripleStr, _mCpu, FeatureStr, Options,
+ RelocModel, CodeModel::Default,
+ CodeGenOpt::Aggressive);
+ return false;
}
-void LTOCodeGenerator::applyRestriction(GlobalValue &GV,
- std::vector<const char*> &mustPreserveList,
- SmallPtrSet<GlobalValue*, 8> &asmUsed,
- Mangler &mangler) {
+void LTOCodeGenerator::
+applyRestriction(GlobalValue &GV,
+ std::vector<const char*> &mustPreserveList,
+ SmallPtrSet<GlobalValue*, 8> &asmUsed,
+ Mangler &mangler) {
SmallString<64> Buffer;
mangler.getNameWithPrefix(Buffer, &GV, false);
SmallPtrSet<GlobalValue*, 8> &UsedValues) {
if (LLVMUsed == 0) return;
- ConstantArray *Inits = dyn_cast<ConstantArray>(LLVMUsed->getInitializer());
- if (Inits == 0) return;
-
+ ConstantArray *Inits = cast<ConstantArray>(LLVMUsed->getInitializer());
for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i)
- if (GlobalValue *GV =
- dyn_cast<GlobalValue>(Inits->getOperand(i)->stripPointerCasts()))
+ if (GlobalValue *GV =
+ dyn_cast<GlobalValue>(Inits->getOperand(i)->stripPointerCasts()))
UsedValues.insert(GV);
}
PassManager passes;
passes.add(createVerifierPass());
- // mark which symbols can not be internalized
- MCContext Context(*_target->getMCAsmInfo(), *_target->getRegisterInfo(),
- NULL, NULL);
- Mangler mangler(Context, *_target->getTargetData());
+ // mark which symbols can not be internalized
+ MCContext Context(_target->getMCAsmInfo(), _target->getRegisterInfo(), NULL);
+ Mangler mangler(Context, _target);
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(),
+ 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(),
if (LLVMCompilerUsed)
LLVMCompilerUsed->eraseFromParent();
- 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);
- }
+ if (!asmUsed.empty()) {
+ 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");
+ 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");
+ 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::generateObjectFile(raw_ostream &out,
std::string &errMsg) {
- if ( this->determineTarget(errMsg) )
- return true;
-
- // mark which symbols can not be internalized
- this->applyScopeRestrictions();
+ if (this->determineTarget(errMsg))
+ return true;
- Module* mergedModule = _linker.getModule();
+ Module* mergedModule = _linker.getModule();
- // if options were requested, set them
- if ( !_codegenOptions.empty() )
- cl::ParseCommandLineOptions(_codegenOptions.size(),
- const_cast<char **>(&_codegenOptions[0]));
+ // Mark which symbols can not be internalized
+ this->applyScopeRestrictions();
- // Instantiate the pass manager to organize the passes.
- PassManager passes;
+ // Instantiate the pass manager to organize the passes.
+ PassManager passes;
- // Start off with a verification pass.
- passes.add(createVerifierPass());
+ // Start off with a verification pass.
+ passes.add(createVerifierPass());
- // Add an appropriate TargetData instance for this module...
- passes.add(new TargetData(*_target->getTargetData()));
-
- PassManagerBuilder().populateLTOPassManager(passes, /*Internalize=*/ false,
- !DisableInline);
+ // Add an appropriate DataLayout instance for this module...
+ passes.add(new DataLayout(*_target->getDataLayout()));
+ _target->addAnalysisPasses(passes);
- // Make sure everything is still good.
- passes.add(createVerifierPass());
+ // Enabling internalize here would use its AllButMain variant. It
+ // keeps only main if it exists and does nothing for libraries. Instead
+ // we create the pass ourselves with the symbol list provided by the linker.
+ if (!DisableOpt)
+ PassManagerBuilder().populateLTOPassManager(passes,
+ /*Internalize=*/false,
+ !DisableInline,
+ DisableGVNLoadPRE);
- FunctionPassManager *codeGenPasses = new FunctionPassManager(mergedModule);
+ // Make sure everything is still good.
+ passes.add(createVerifierPass());
- codeGenPasses->add(new TargetData(*_target->getTargetData()));
+ PassManager codeGenPasses;
- formatted_raw_ostream Out(out);
+ codeGenPasses.add(new DataLayout(*_target->getDataLayout()));
+ _target->addAnalysisPasses(codeGenPasses);
- if (_target->addPassesToEmitFile(*codeGenPasses, Out,
- TargetMachine::CGFT_ObjectFile,
- CodeGenOpt::Aggressive)) {
- errMsg = "target file type not supported";
- return true;
- }
+ formatted_raw_ostream Out(out);
- // Run our queue of passes all at once now, efficiently.
- passes.run(*mergedModule);
+ // If the bitcode files contain ARC code and were compiled with optimization,
+ // the ObjCARCContractPass must be run, so do it unconditionally here.
+ codeGenPasses.add(createObjCARCContractPass());
- // Run the code generator, and write assembly file
- codeGenPasses->doInitialization();
+ if (_target->addPassesToEmitFile(codeGenPasses, Out,
+ TargetMachine::CGFT_ObjectFile)) {
+ errMsg = "target file type not supported";
+ return true;
+ }
- for (Module::iterator
- it = mergedModule->begin(), e = mergedModule->end(); it != e; ++it)
- if (!it->isDeclaration())
- codeGenPasses->run(*it);
+ // Run our queue of passes all at once now, efficiently.
+ passes.run(*mergedModule);
- codeGenPasses->doFinalization();
- delete codeGenPasses;
+ // Run the code generator, and write assembly file
+ codeGenPasses.run(*mergedModule);
- return false; // success
+ return false; // success
}
-
-/// Optimize merged modules using various IPO passes
-void LTOCodeGenerator::setCodeGenDebugOptions(const char* options)
-{
- 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.first.str().c_str()));
- }
+/// setCodeGenDebugOptions - Set codegen debugging options to aid in debugging
+/// LTO problems.
+void LTOCodeGenerator::setCodeGenDebugOptions(const char *options) {
+ 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(strdup("libLTO"));
+ _codegenOptions.push_back(strdup(o.first.str().c_str()));
+ }
}
projects / oota-llvm.git / blobdiff