2008-02-26 20:26:43 +00:00
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//===-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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2008-02-27 22:25:36 +00:00
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#include "LTOModule.h"
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#include "LTOCodeGenerator.h"
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2008-02-26 20:26:43 +00:00
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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2009-06-17 06:52:10 +00:00
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#include "llvm/Linker.h"
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2009-07-02 00:31:14 +00:00
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#include "llvm/LLVMContext.h"
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2009-06-17 06:52:10 +00:00
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/ADT/StringExtras.h"
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2009-11-17 18:48:27 +00:00
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#include "llvm/ADT/Triple.h"
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2009-06-17 06:52:10 +00:00
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#include "llvm/Analysis/Passes.h"
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2008-02-26 20:26:43 +00:00
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#include "llvm/Bitcode/ReaderWriter.h"
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2010-03-12 18:44:54 +00:00
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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2010-01-16 21:57:06 +00:00
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#include "llvm/Target/Mangler.h"
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2008-06-18 06:35:30 +00:00
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#include "llvm/Target/SubtargetFeature.h"
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2008-02-26 20:26:43 +00:00
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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2009-07-16 02:41:19 +00:00
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#include "llvm/Target/TargetRegistry.h"
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2009-06-17 16:42:19 +00:00
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#include "llvm/Target/TargetSelect.h"
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2010-03-12 18:44:54 +00:00
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FormattedStream.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/System/Host.h"
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#include "llvm/System/Program.h"
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#include "llvm/System/Signals.h"
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2008-02-26 20:26:43 +00:00
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#include "llvm/Config/config.h"
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2009-06-17 06:52:10 +00:00
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#include <cstdlib>
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2008-02-26 20:26:43 +00:00
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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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2008-07-08 21:14:10 +00:00
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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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2008-02-26 20:26:43 +00:00
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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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2009-07-02 00:31:14 +00:00
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LTOCodeGenerator::LTOCodeGenerator()
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: _context(getGlobalContext()),
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2009-07-01 16:58:40 +00:00
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_linker("LinkTimeOptimizer", "ld-temp.o", _context), _target(NULL),
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2008-02-26 20:26:43 +00:00
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_emitDwarfDebugInfo(false), _scopeRestrictionsDone(false),
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2008-02-27 22:25:36 +00:00
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_codeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC),
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2009-08-03 07:16:42 +00:00
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_nativeObjectFile(NULL), _assemblerPath(NULL)
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2008-02-26 20:26:43 +00:00
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{
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2009-07-26 22:16:39 +00:00
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InitializeAllTargets();
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InitializeAllAsmPrinters();
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2008-02-26 20:26:43 +00:00
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}
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LTOCodeGenerator::~LTOCodeGenerator()
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{
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2008-02-27 22:25:36 +00:00
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delete _target;
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delete _nativeObjectFile;
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2008-02-26 20:26:43 +00:00
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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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2009-06-26 06:57:16 +00:00
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std::string& errMsg)
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2008-02-26 20:26:43 +00:00
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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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2009-06-04 00:28:45 +00:00
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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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2010-08-10 18:55:09 +00:00
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void LTOCodeGenerator::setAssemblerArgs(const char** args, int nargs)
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{
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for (int i = 0; i < nargs; ++i) {
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const char *arg = args[i];
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_assemblerArgs.push_back(arg);
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}
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}
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2008-02-26 20:26:43 +00:00
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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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2009-08-23 07:49:08 +00:00
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bool LTOCodeGenerator::writeMergedModules(const char *path,
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std::string &errMsg) {
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if (determineTarget(errMsg))
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return true;
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// mark which symbols can not be internalized
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applyScopeRestrictions();
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// create output file
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std::string ErrInfo;
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raw_fd_ostream Out(path, ErrInfo,
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2009-08-25 15:34:52 +00:00
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raw_fd_ostream::F_Binary);
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2009-08-23 07:49:08 +00:00
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if (!ErrInfo.empty()) {
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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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2008-02-26 20:26:43 +00:00
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2009-08-23 07:49:08 +00:00
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// write bitcode to it
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WriteBitcodeToFile(_linker.getModule(), Out);
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2010-05-27 20:19:47 +00:00
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Out.close();
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2009-08-23 07:49:08 +00:00
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if (Out.has_error()) {
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errMsg = "could not write bitcode file: ";
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errMsg += path;
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2010-05-27 20:19:47 +00:00
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Out.clear_error();
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2009-08-23 07:49:08 +00:00
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return true;
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}
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return false;
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2008-02-26 20:26:43 +00:00
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}
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2008-02-27 22:25:36 +00:00
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const void* LTOCodeGenerator::compile(size_t* length, std::string& errMsg)
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2008-02-26 20:26:43 +00:00
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{
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2008-02-27 22:25:36 +00:00
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// make unique temp .s file to put generated assembly code
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2008-02-26 20:26:43 +00:00
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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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2008-08-21 00:14:44 +00:00
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bool genResult = false;
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{
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2009-08-25 15:34:52 +00:00
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raw_fd_ostream asmFD(uniqueAsmPath.c_str(), errMsg);
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2009-07-14 20:18:05 +00:00
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formatted_raw_ostream asmFile(asmFD);
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2008-08-21 15:33:45 +00:00
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if (!errMsg.empty())
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return NULL;
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2008-08-21 00:14:44 +00:00
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genResult = this->generateAssemblyCode(asmFile, errMsg);
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}
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2008-02-26 20:26:43 +00:00
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if ( genResult ) {
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2010-05-27 20:51:54 +00:00
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uniqueAsmPath.eraseFromDisk();
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2008-02-26 20:26:43 +00:00
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return NULL;
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}
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2008-02-27 22:25:36 +00:00
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// make unique temp .o file to put generated object file
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2008-02-26 20:26:43 +00:00
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sys::PathWithStatus uniqueObjPath("lto-llvm.o");
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if ( uniqueObjPath.createTemporaryFileOnDisk(true, &errMsg) ) {
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2010-05-27 20:51:54 +00:00
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uniqueAsmPath.eraseFromDisk();
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2008-02-26 20:26:43 +00:00
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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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2009-08-23 22:45:37 +00:00
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const std::string& uniqueObjStr = uniqueObjPath.str();
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bool asmResult = this->assemble(uniqueAsmPath.str(), uniqueObjStr, errMsg);
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2008-02-26 20:26:43 +00:00
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if ( !asmResult ) {
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2008-02-27 22:25:36 +00:00
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// remove old buffer if compile() called twice
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delete _nativeObjectFile;
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2008-02-26 20:26:43 +00:00
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// read .o file into memory buffer
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2008-04-01 18:04:03 +00:00
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_nativeObjectFile = MemoryBuffer::getFile(uniqueObjStr.c_str(),&errMsg);
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2008-02-26 20:26:43 +00:00
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}
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2008-02-27 22:25:36 +00:00
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// remove temp files
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2008-02-26 20:26:43 +00:00
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uniqueAsmPath.eraseFromDisk();
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uniqueObjPath.eraseFromDisk();
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2008-02-27 22:25:36 +00:00
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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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2008-02-26 20:26:43 +00:00
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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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2009-06-04 00:28:45 +00:00
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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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2009-04-30 15:24:09 +00:00
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} else {
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// find compiler driver
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2009-06-04 00:28:45 +00:00
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tool = sys::Program::FindProgramByName("gcc");
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if ( tool.isEmpty() ) {
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2009-04-30 15:24:09 +00:00
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errMsg = "can't locate gcc";
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return true;
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}
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2008-02-26 20:26:43 +00:00
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}
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// build argument list
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std::vector<const char*> args;
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2009-11-17 18:48:27 +00:00
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llvm::Triple targetTriple(_linker.getModule()->getTargetTriple());
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const char *arch = targetTriple.getArchNameForAssembler();
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2009-06-04 00:28:45 +00:00
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args.push_back(tool.c_str());
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2009-11-17 18:48:27 +00:00
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if (targetTriple.getOS() == Triple::Darwin) {
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2009-06-04 19:14:08 +00:00
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// darwin specific command line options
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2009-11-17 18:48:27 +00:00
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if (arch != NULL) {
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2009-06-22 18:01:28 +00:00
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args.push_back("-arch");
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2009-11-17 18:48:27 +00:00
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args.push_back(arch);
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2009-06-22 18:01:28 +00:00
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}
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2009-06-04 19:14:08 +00:00
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// add -static to assembler command line when code model requires
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2010-03-12 18:44:54 +00:00
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if ( (_assemblerPath != NULL) &&
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(_codeModel == LTO_CODEGEN_PIC_MODEL_STATIC) )
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2009-06-04 19:14:08 +00:00
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args.push_back("-static");
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2008-02-26 20:26:43 +00:00
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}
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2009-06-04 00:28:45 +00:00
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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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2010-08-10 18:55:09 +00:00
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} else {
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for (std::vector<std::string>::iterator I = _assemblerArgs.begin(),
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E = _assemblerArgs.end(); I != E; ++I) {
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args.push_back(I->c_str());
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}
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2009-06-04 00:28:45 +00:00
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}
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2008-02-26 20:26:43 +00:00
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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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2009-06-04 00:28:45 +00:00
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if ( sys::Program::ExecuteAndWait(tool, &args[0], 0, 0, 0, 0, &errMsg) ) {
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2008-02-26 20:26:43 +00:00
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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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2009-08-03 04:03:51 +00:00
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std::string Triple = _linker.getModule()->getTargetTriple();
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if (Triple.empty())
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Triple = sys::getHostTriple();
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2008-02-26 20:26:43 +00:00
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// create target machine from info for merged modules
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2009-08-03 04:20:57 +00:00
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const Target *march = TargetRegistry::lookupTarget(Triple, errMsg);
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2008-02-26 20:26:43 +00:00
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if ( march == NULL )
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return true;
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2008-06-18 06:35:30 +00:00
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2009-06-03 22:52:12 +00:00
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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:
|
|
|
|
TargetMachine::setRelocationModel(Reloc::DynamicNoPIC);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2008-06-18 06:35:30 +00:00
|
|
|
// construct LTModule, hand over ownership of module and target
|
2010-05-11 00:30:02 +00:00
|
|
|
SubtargetFeatures Features;
|
|
|
|
Features.getDefaultSubtargetFeatures("" /* cpu */, llvm::Triple(Triple));
|
|
|
|
std::string FeatureStr = Features.getString();
|
2009-11-25 22:44:18 +00:00
|
|
|
_target = march->createTargetMachine(Triple, FeatureStr);
|
2008-02-26 20:26:43 +00:00
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
2010-03-12 18:44:54 +00:00
|
|
|
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
|
|
|
|
if (!_mustPreserveSymbols.empty()) {
|
|
|
|
MCContext Context(*_target->getMCAsmInfo());
|
2010-03-12 20:47:28 +00:00
|
|
|
Mangler mangler(Context, *_target->getTargetData());
|
2010-03-12 18:44:54 +00:00
|
|
|
std::vector<const char*> mustPreserveList;
|
|
|
|
for (Module::iterator f = mergedModule->begin(),
|
|
|
|
e = mergedModule->end(); f != e; ++f) {
|
|
|
|
if (!f->isDeclaration() &&
|
|
|
|
_mustPreserveSymbols.count(mangler.getNameWithPrefix(f)))
|
|
|
|
mustPreserveList.push_back(::strdup(f->getNameStr().c_str()));
|
|
|
|
}
|
|
|
|
for (Module::global_iterator v = mergedModule->global_begin(),
|
|
|
|
e = mergedModule->global_end(); v != e; ++v) {
|
2010-04-27 00:55:25 +00:00
|
|
|
if (!v->isDeclaration() &&
|
2010-03-12 18:44:54 +00:00
|
|
|
_mustPreserveSymbols.count(mangler.getNameWithPrefix(v)))
|
|
|
|
mustPreserveList.push_back(::strdup(v->getNameStr().c_str()));
|
2008-02-26 20:26:43 +00:00
|
|
|
}
|
2010-03-12 18:44:54 +00:00
|
|
|
passes.add(createInternalizePass(mustPreserveList));
|
|
|
|
}
|
|
|
|
|
|
|
|
// apply scope restrictions
|
|
|
|
passes.run(*mergedModule);
|
|
|
|
|
|
|
|
_scopeRestrictionsDone = true;
|
2008-02-26 20:26:43 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/// Optimize merged modules using various IPO passes
|
2009-07-14 20:18:05 +00:00
|
|
|
bool LTOCodeGenerator::generateAssemblyCode(formatted_raw_ostream& out,
|
2008-08-21 00:14:44 +00:00
|
|
|
std::string& errMsg)
|
2008-02-26 20:26:43 +00:00
|
|
|
{
|
2009-07-26 22:16:39 +00:00
|
|
|
if ( this->determineTarget(errMsg) )
|
2008-02-26 20:26:43 +00:00
|
|
|
return true;
|
|
|
|
|
|
|
|
// mark which symbols can not be internalized
|
|
|
|
this->applyScopeRestrictions();
|
|
|
|
|
|
|
|
Module* mergedModule = _linker.getModule();
|
|
|
|
|
2008-07-08 21:14:10 +00:00
|
|
|
// if options were requested, set them
|
|
|
|
if ( !_codegenOptions.empty() )
|
|
|
|
cl::ParseCommandLineOptions(_codegenOptions.size(),
|
2010-04-17 17:44:03 +00:00
|
|
|
const_cast<char **>(&_codegenOptions[0]));
|
2008-07-03 22:53:14 +00:00
|
|
|
|
2008-02-26 20:26:43 +00:00
|
|
|
// Instantiate the pass manager to organize the passes.
|
|
|
|
PassManager passes;
|
|
|
|
|
|
|
|
// Start off with a verification pass.
|
|
|
|
passes.add(createVerifierPass());
|
|
|
|
|
|
|
|
// Add an appropriate TargetData instance for this module...
|
|
|
|
passes.add(new TargetData(*_target->getTargetData()));
|
|
|
|
|
2009-06-03 21:06:14 +00:00
|
|
|
createStandardLTOPasses(&passes, /*Internalize=*/ false, !DisableInline,
|
|
|
|
/*VerifyEach=*/ false);
|
2008-02-26 20:26:43 +00:00
|
|
|
|
|
|
|
// Make sure everything is still good.
|
|
|
|
passes.add(createVerifierPass());
|
|
|
|
|
2010-01-27 20:34:15 +00:00
|
|
|
FunctionPassManager* codeGenPasses = new FunctionPassManager(mergedModule);
|
2008-02-26 20:26:43 +00:00
|
|
|
|
|
|
|
codeGenPasses->add(new TargetData(*_target->getTargetData()));
|
|
|
|
|
2010-02-03 05:55:08 +00:00
|
|
|
if (_target->addPassesToEmitFile(*codeGenPasses, out,
|
|
|
|
TargetMachine::CGFT_AssemblyFile,
|
|
|
|
CodeGenOpt::Aggressive)) {
|
|
|
|
errMsg = "target file type not supported";
|
|
|
|
return true;
|
2008-02-26 20:26:43 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// Run our queue of passes all at once now, efficiently.
|
|
|
|
passes.run(*mergedModule);
|
|
|
|
|
|
|
|
// Run the code generator, and write assembly file
|
|
|
|
codeGenPasses->doInitialization();
|
|
|
|
|
2008-06-18 06:35:30 +00:00
|
|
|
for (Module::iterator
|
|
|
|
it = mergedModule->begin(), e = mergedModule->end(); it != e; ++it)
|
|
|
|
if (!it->isDeclaration())
|
|
|
|
codeGenPasses->run(*it);
|
|
|
|
|
|
|
|
codeGenPasses->doFinalization();
|
2009-07-26 22:16:39 +00:00
|
|
|
|
2008-02-26 20:26:43 +00:00
|
|
|
return false; // success
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2008-07-08 21:14:10 +00:00
|
|
|
/// Optimize merged modules using various IPO passes
|
|
|
|
void LTOCodeGenerator::setCodeGenDebugOptions(const char* options)
|
|
|
|
{
|
2010-01-11 18:03:24 +00:00
|
|
|
for (std::pair<StringRef, StringRef> o = getToken(options);
|
|
|
|
!o.first.empty(); o = getToken(o.second)) {
|
2008-07-08 21:14:10 +00:00
|
|
|
// ParseCommandLineOptions() expects argv[0] to be program name.
|
|
|
|
// Lazily add that.
|
|
|
|
if ( _codegenOptions.empty() )
|
|
|
|
_codegenOptions.push_back("libLTO");
|
2010-01-11 18:03:24 +00:00
|
|
|
_codegenOptions.push_back(strdup(o.first.str().c_str()));
|
2008-07-08 21:14:10 +00:00
|
|
|
}
|
|
|
|
}
|