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ac57e6e498
cleanup, removed some #includes and moved Object Code Emitter out-of-line. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74813 91177308-0d34-0410-b5e6-96231b3b80d8
486 lines
16 KiB
C++
486 lines
16 KiB
C++
//===-LTOCodeGenerator.cpp - LLVM Link Time Optimizer ---------------------===//
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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 implements the Link Time Optimization library. This library is
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// intended to be used by linker to optimize code at link time.
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//
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//===----------------------------------------------------------------------===//
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#include "LTOModule.h"
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#include "LTOCodeGenerator.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Linker.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/PassManager.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/LoopPass.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/CodeGen/FileWriters.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/StandardPasses.h"
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#include "llvm/Support/SystemUtils.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/System/Signals.h"
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#include "llvm/Target/SubtargetFeature.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachineRegistry.h"
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#include "llvm/Target/TargetSelect.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Config/config.h"
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#include <cstdlib>
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#include <fstream>
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#include <unistd.h>
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#include <fcntl.h>
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using namespace llvm;
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static cl::opt<bool> DisableInline("disable-inlining",
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cl::desc("Do not run the inliner pass"));
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const char* LTOCodeGenerator::getVersionString()
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{
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#ifdef LLVM_VERSION_INFO
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return PACKAGE_NAME " version " PACKAGE_VERSION ", " LLVM_VERSION_INFO;
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#else
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return PACKAGE_NAME " version " PACKAGE_VERSION;
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#endif
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}
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LTOCodeGenerator::LTOCodeGenerator()
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: _context(getGlobalContext()),
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_linker("LinkTimeOptimizer", "ld-temp.o", _context), _target(NULL),
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_emitDwarfDebugInfo(false), _scopeRestrictionsDone(false),
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_codeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC),
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_nativeObjectFile(NULL), _gccPath(NULL), _assemblerPath(NULL)
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{
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InitializeAllTargets();
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InitializeAllAsmPrinters();
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}
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LTOCodeGenerator::~LTOCodeGenerator()
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{
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delete _target;
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delete _nativeObjectFile;
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}
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bool LTOCodeGenerator::addModule(LTOModule* mod, std::string& errMsg)
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{
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return _linker.LinkInModule(mod->getLLVVMModule(), &errMsg);
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}
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bool LTOCodeGenerator::setDebugInfo(lto_debug_model debug, std::string& errMsg)
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{
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switch (debug) {
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case LTO_DEBUG_MODEL_NONE:
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_emitDwarfDebugInfo = false;
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return false;
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case LTO_DEBUG_MODEL_DWARF:
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_emitDwarfDebugInfo = true;
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return false;
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}
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errMsg = "unknown debug format";
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return true;
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}
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bool LTOCodeGenerator::setCodePICModel(lto_codegen_model model,
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std::string& errMsg)
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{
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switch (model) {
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case LTO_CODEGEN_PIC_MODEL_STATIC:
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case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
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case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
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_codeModel = model;
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return false;
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}
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errMsg = "unknown pic model";
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return true;
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}
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void LTOCodeGenerator::setGccPath(const char* path)
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{
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if ( _gccPath )
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delete _gccPath;
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_gccPath = new sys::Path(path);
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}
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void LTOCodeGenerator::setAssemblerPath(const char* path)
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{
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if ( _assemblerPath )
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delete _assemblerPath;
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_assemblerPath = new sys::Path(path);
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}
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void LTOCodeGenerator::addMustPreserveSymbol(const char* sym)
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{
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_mustPreserveSymbols[sym] = 1;
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}
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bool LTOCodeGenerator::writeMergedModules(const char* path, std::string& errMsg)
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{
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if ( this->determineTarget(errMsg) )
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return true;
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// mark which symbols can not be internalized
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this->applyScopeRestrictions();
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// create output file
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std::ofstream out(path, std::ios_base::out|std::ios::trunc|std::ios::binary);
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if ( out.fail() ) {
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errMsg = "could not open bitcode file for writing: ";
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errMsg += path;
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return true;
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}
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// write bitcode to it
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WriteBitcodeToFile(_linker.getModule(), out);
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if ( out.fail() ) {
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errMsg = "could not write bitcode file: ";
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errMsg += path;
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return true;
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}
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return false;
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}
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const void* LTOCodeGenerator::compile(size_t* length, std::string& errMsg)
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{
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// make unique temp .s file to put generated assembly code
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sys::Path uniqueAsmPath("lto-llvm.s");
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if ( uniqueAsmPath.createTemporaryFileOnDisk(true, &errMsg) )
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return NULL;
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sys::RemoveFileOnSignal(uniqueAsmPath);
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// generate assembly code
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bool genResult = false;
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{
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raw_fd_ostream asmFile(uniqueAsmPath.c_str(), false, errMsg);
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if (!errMsg.empty())
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return NULL;
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genResult = this->generateAssemblyCode(asmFile, errMsg);
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}
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if ( genResult ) {
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if ( uniqueAsmPath.exists() )
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uniqueAsmPath.eraseFromDisk();
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return NULL;
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}
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// make unique temp .o file to put generated object file
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sys::PathWithStatus uniqueObjPath("lto-llvm.o");
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if ( uniqueObjPath.createTemporaryFileOnDisk(true, &errMsg) ) {
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if ( uniqueAsmPath.exists() )
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uniqueAsmPath.eraseFromDisk();
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return NULL;
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}
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sys::RemoveFileOnSignal(uniqueObjPath);
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// assemble the assembly code
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const std::string& uniqueObjStr = uniqueObjPath.toString();
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bool asmResult = this->assemble(uniqueAsmPath.toString(),
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uniqueObjStr, errMsg);
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if ( !asmResult ) {
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// remove old buffer if compile() called twice
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delete _nativeObjectFile;
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// read .o file into memory buffer
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_nativeObjectFile = MemoryBuffer::getFile(uniqueObjStr.c_str(),&errMsg);
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}
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// remove temp files
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uniqueAsmPath.eraseFromDisk();
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uniqueObjPath.eraseFromDisk();
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// return buffer, unless error
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if ( _nativeObjectFile == NULL )
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return NULL;
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*length = _nativeObjectFile->getBufferSize();
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return _nativeObjectFile->getBufferStart();
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}
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bool LTOCodeGenerator::assemble(const std::string& asmPath,
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const std::string& objPath, std::string& errMsg)
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{
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sys::Path tool;
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bool needsCompilerOptions = true;
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if ( _assemblerPath ) {
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tool = *_assemblerPath;
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needsCompilerOptions = false;
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}
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else if ( _gccPath ) {
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tool = *_gccPath;
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} else {
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// find compiler driver
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tool = sys::Program::FindProgramByName("gcc");
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if ( tool.isEmpty() ) {
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errMsg = "can't locate gcc";
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return true;
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}
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}
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// build argument list
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std::vector<const char*> args;
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std::string targetTriple = _linker.getModule()->getTargetTriple();
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args.push_back(tool.c_str());
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if ( targetTriple.find("darwin") != std::string::npos ) {
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// darwin specific command line options
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if (strncmp(targetTriple.c_str(), "i386-apple-", 11) == 0) {
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args.push_back("-arch");
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args.push_back("i386");
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}
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else if (strncmp(targetTriple.c_str(), "x86_64-apple-", 13) == 0) {
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args.push_back("-arch");
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args.push_back("x86_64");
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}
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else if (strncmp(targetTriple.c_str(), "powerpc-apple-", 14) == 0) {
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args.push_back("-arch");
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args.push_back("ppc");
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}
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else if (strncmp(targetTriple.c_str(), "powerpc64-apple-", 16) == 0) {
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args.push_back("-arch");
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args.push_back("ppc64");
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}
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else if (strncmp(targetTriple.c_str(), "arm-apple-", 10) == 0) {
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args.push_back("-arch");
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args.push_back("arm");
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}
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else if ((strncmp(targetTriple.c_str(), "armv4t-apple-", 13) == 0) ||
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(strncmp(targetTriple.c_str(), "thumbv4t-apple-", 15) == 0)) {
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args.push_back("-arch");
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args.push_back("armv4t");
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}
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else if ((strncmp(targetTriple.c_str(), "armv5-apple-", 12) == 0) ||
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(strncmp(targetTriple.c_str(), "armv5e-apple-", 13) == 0) ||
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(strncmp(targetTriple.c_str(), "thumbv5-apple-", 14) == 0) ||
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(strncmp(targetTriple.c_str(), "thumbv5e-apple-", 15) == 0)) {
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args.push_back("-arch");
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args.push_back("armv5");
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}
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else if ((strncmp(targetTriple.c_str(), "armv6-apple-", 12) == 0) ||
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(strncmp(targetTriple.c_str(), "thumbv6-apple-", 14) == 0)) {
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args.push_back("-arch");
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args.push_back("armv6");
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}
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else if ((strncmp(targetTriple.c_str(), "armv7-apple-", 12) == 0) ||
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(strncmp(targetTriple.c_str(), "thumbv7-apple-", 14) == 0)) {
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args.push_back("-arch");
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args.push_back("armv7");
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}
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// add -static to assembler command line when code model requires
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if ( (_assemblerPath != NULL) && (_codeModel == LTO_CODEGEN_PIC_MODEL_STATIC) )
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args.push_back("-static");
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}
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if ( needsCompilerOptions ) {
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args.push_back("-c");
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args.push_back("-x");
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args.push_back("assembler");
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}
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args.push_back("-o");
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args.push_back(objPath.c_str());
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args.push_back(asmPath.c_str());
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args.push_back(0);
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// invoke assembler
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if ( sys::Program::ExecuteAndWait(tool, &args[0], 0, 0, 0, 0, &errMsg) ) {
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errMsg = "error in assembly";
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return true;
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}
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return false; // success
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}
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bool LTOCodeGenerator::determineTarget(std::string& errMsg)
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{
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if ( _target == NULL ) {
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// create target machine from info for merged modules
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Module* mergedModule = _linker.getModule();
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const TargetMachineRegistry::entry* march =
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TargetMachineRegistry::getClosestStaticTargetForModule(
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*mergedModule, errMsg);
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if ( march == NULL )
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return true;
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// The relocation model is actually a static member of TargetMachine
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// and needs to be set before the TargetMachine is instantiated.
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switch( _codeModel ) {
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case LTO_CODEGEN_PIC_MODEL_STATIC:
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TargetMachine::setRelocationModel(Reloc::Static);
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break;
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case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
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TargetMachine::setRelocationModel(Reloc::PIC_);
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break;
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case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
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TargetMachine::setRelocationModel(Reloc::DynamicNoPIC);
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break;
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}
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// construct LTModule, hand over ownership of module and target
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std::string FeatureStr =
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getFeatureString(_linker.getModule()->getTargetTriple().c_str());
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_target = march->CtorFn(*mergedModule, FeatureStr.c_str());
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}
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return false;
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}
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void LTOCodeGenerator::applyScopeRestrictions()
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{
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if ( !_scopeRestrictionsDone ) {
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Module* mergedModule = _linker.getModule();
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// Start off with a verification pass.
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PassManager passes;
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passes.add(createVerifierPass());
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// mark which symbols can not be internalized
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if ( !_mustPreserveSymbols.empty() ) {
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Mangler mangler(*mergedModule,
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_target->getTargetAsmInfo()->getGlobalPrefix());
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std::vector<const char*> mustPreserveList;
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for (Module::iterator f = mergedModule->begin(),
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e = mergedModule->end(); f != e; ++f) {
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if ( !f->isDeclaration()
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&& _mustPreserveSymbols.count(mangler.getValueName(f)) )
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mustPreserveList.push_back(::strdup(f->getName().c_str()));
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}
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for (Module::global_iterator v = mergedModule->global_begin(),
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e = mergedModule->global_end(); v != e; ++v) {
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if ( !v->isDeclaration()
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&& _mustPreserveSymbols.count(mangler.getValueName(v)) )
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mustPreserveList.push_back(::strdup(v->getName().c_str()));
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}
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passes.add(createInternalizePass(mustPreserveList));
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}
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// apply scope restrictions
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passes.run(*mergedModule);
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_scopeRestrictionsDone = true;
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}
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}
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/// Optimize merged modules using various IPO passes
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bool LTOCodeGenerator::generateAssemblyCode(raw_ostream& out,
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std::string& errMsg)
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{
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if ( this->determineTarget(errMsg) )
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return true;
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// mark which symbols can not be internalized
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this->applyScopeRestrictions();
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Module* mergedModule = _linker.getModule();
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// If target supports exception handling then enable it now.
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if ( _target->getTargetAsmInfo()->doesSupportExceptionHandling() )
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llvm::ExceptionHandling = true;
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// if options were requested, set them
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if ( !_codegenOptions.empty() )
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cl::ParseCommandLineOptions(_codegenOptions.size(),
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(char**)&_codegenOptions[0]);
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// Instantiate the pass manager to organize the passes.
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PassManager passes;
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// Start off with a verification pass.
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passes.add(createVerifierPass());
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// Add an appropriate TargetData instance for this module...
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passes.add(new TargetData(*_target->getTargetData()));
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createStandardLTOPasses(&passes, /*Internalize=*/ false, !DisableInline,
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/*VerifyEach=*/ false);
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// Make sure everything is still good.
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passes.add(createVerifierPass());
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FunctionPassManager* codeGenPasses =
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new FunctionPassManager(new ExistingModuleProvider(mergedModule));
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codeGenPasses->add(new TargetData(*_target->getTargetData()));
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ObjectCodeEmitter* oce = NULL;
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switch (_target->addPassesToEmitFile(*codeGenPasses, out,
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TargetMachine::AssemblyFile,
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CodeGenOpt::Aggressive)) {
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case FileModel::MachOFile:
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oce = AddMachOWriter(*codeGenPasses, out, *_target);
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break;
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case FileModel::ElfFile:
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oce = AddELFWriter(*codeGenPasses, out, *_target);
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break;
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case FileModel::AsmFile:
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break;
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case FileModel::Error:
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case FileModel::None:
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errMsg = "target file type not supported";
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return true;
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}
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if (_target->addPassesToEmitFileFinish(*codeGenPasses, oce,
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CodeGenOpt::Aggressive)) {
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errMsg = "target does not support generation of this file type";
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return true;
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}
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// Run our queue of passes all at once now, efficiently.
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passes.run(*mergedModule);
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// Run the code generator, and write assembly file
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codeGenPasses->doInitialization();
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for (Module::iterator
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it = mergedModule->begin(), e = mergedModule->end(); it != e; ++it)
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if (!it->isDeclaration())
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codeGenPasses->run(*it);
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codeGenPasses->doFinalization();
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return false; // success
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}
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/// Optimize merged modules using various IPO passes
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void LTOCodeGenerator::setCodeGenDebugOptions(const char* options)
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{
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std::string ops(options);
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for (std::string o = getToken(ops); !o.empty(); o = getToken(ops)) {
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// ParseCommandLineOptions() expects argv[0] to be program name.
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// Lazily add that.
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if ( _codegenOptions.empty() )
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_codegenOptions.push_back("libLTO");
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_codegenOptions.push_back(strdup(o.c_str()));
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}
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}
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