lto.cpp revision 998051a2211a5f86b38941de0aca241b34895e1e
1049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project//===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===// 2049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// 3049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// The LLVM Compiler Infrastructure 4049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// 5049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// This file was developed by Devang Patel and is distributed under 6049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// the University of Illinois Open Source License. See LICENSE.TXT for details. 7727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease// 8049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project//===----------------------------------------------------------------------===// 9049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// 10049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// This file implementes link time optimization library. This library is 11049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// intended to be used by linker to optimize code at link time. 12049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// 13049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project//===----------------------------------------------------------------------===// 14049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 15049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Module.h" 16049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/PassManager.h" 17049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Linker.h" 18049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Constants.h" 19049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/DerivedTypes.h" 20049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/SymbolTable.h" 21049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Bytecode/Reader.h" 22049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Bytecode/Writer.h" 23049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Support/CommandLine.h" 24049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Support/FileUtilities.h" 25049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Support/SystemUtils.h" 26049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Support/Mangler.h" 27049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/System/Program.h" 28049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/System/Signals.h" 29049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Analysis/Passes.h" 30049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Analysis/Verifier.h" 31049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Target/SubtargetFeature.h" 32049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Target/TargetData.h" 33049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Target/TargetMachine.h" 34049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Target/TargetMachineRegistry.h" 35049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Transforms/IPO.h" 36049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Transforms/Scalar.h" 37049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/Analysis/LoadValueNumbering.h" 38049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include "llvm/LinkTimeOptimizer.h" 39049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include <fstream> 40049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#include <iostream> 41049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 42049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Projectusing namespace llvm; 43049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 44049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Projectextern "C" 45049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Projectllvm::LinkTimeOptimizer *createLLVMOptimizer() 46049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project{ 47049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project llvm::LinkTimeOptimizer *l = new llvm::LinkTimeOptimizer(); 48049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return l; 49049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project} 50049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 51049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 52049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 53049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project/// If symbol is not used then make it internal and let optimizer takes 54049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project/// care of it. 55049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Projectvoid LLVMSymbol::mayBeNotUsed() { 56049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project gv->setLinkage(GlobalValue::InternalLinkage); 57049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project} 58049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 59049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// Helper routine 60049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// FIXME : Take advantage of GlobalPrefix from AsmPrinter 61049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Projectstatic const char *addUnderscore(const char *name) { 62049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project size_t namelen = strlen(name); 63049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project char *symName = (char*)malloc(namelen+2); 64049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project symName[0] = '_'; 65049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project strcpy(&symName[1], name); 66049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return symName; 67049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project} 68049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 69049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// Map LLVM LinkageType to LTO LinakgeType 70049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Projectstatic LTOLinkageTypes 71049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source ProjectgetLTOLinkageType(GlobalValue *v) 72049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project{ 73049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project LTOLinkageTypes lt; 74049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (v->hasExternalLinkage()) 75049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project lt = LTOExternalLinkage; 76049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project else if (v->hasLinkOnceLinkage()) 77049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project lt = LTOLinkOnceLinkage; 78049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project else if (v->hasWeakLinkage()) 79049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project lt = LTOWeakLinkage; 80049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project else 81049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Otherwise it is internal linkage for link time optimizer 82049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project lt = LTOInternalLinkage; 83049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return lt; 84049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project} 85049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 86049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project// Find exeternal symbols referenced by VALUE. This is a recursive function. 87049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Projectstatic void 88049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source ProjectfindExternalRefs(Value *value, std::set<std::string> &references, 89049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Mangler &mangler) { 90049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 91049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (GlobalValue *gv = dyn_cast<GlobalValue>(value)) { 92049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project LTOLinkageTypes lt = getLTOLinkageType(gv); 93049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (lt != LTOInternalLinkage && strncmp (gv->getName().c_str(), "llvm.", 5)) 94049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project references.insert(mangler.getValueName(gv)); 95049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project } 96049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project else if (Constant *c = dyn_cast<Constant>(value)) 97049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Handle ConstantExpr, ConstantStruct, ConstantArry etc.. 98049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project for (unsigned i = 0, e = c->getNumOperands(); i != e; ++i) 99049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project findExternalRefs(c->getOperand(i), references, mangler); 100049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project} 101049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 102049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project/// InputFilename is a LLVM bytecode file. If Module with InputFilename is 103049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project/// available then return it. Otherwise parseInputFilename. 104ec0bab5697bb31ba980810145f62e3799946ec60Victoria LeaseModule * 105ec0bab5697bb31ba980810145f62e3799946ec60Victoria LeaseLinkTimeOptimizer::getModule(const std::string &InputFilename) 106049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project{ 107049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Module *m = NULL; 108049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 109049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project NameToModuleMap::iterator pos = allModules.find(InputFilename.c_str()); 110727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease if (pos != allModules.end()) 111727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease m = allModules[InputFilename.c_str()]; 112727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease else { 113727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease m = ParseBytecodeFile(InputFilename); 114727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease allModules[InputFilename.c_str()] = m; 115727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease } 116727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease return m; 117727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease} 118727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 119727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease/// InputFilename is a LLVM bytecode file. Reade this bytecode file and 120727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease/// set corresponding target triplet string. 121727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Leasevoid 122727dee178a392d20eb050d0c446f2fcc29058fa1Victoria LeaseLinkTimeOptimizer::getTargetTriple(const std::string &InputFilename, 123727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease std::string &targetTriple) 124727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease{ 125727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Module *m = getModule(InputFilename); 126727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease if (m) 127727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease targetTriple = m->getTargetTriple(); 128727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease} 129727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 130727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease/// InputFilename is a LLVM bytecode file. Read it using bytecode reader. 131727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease/// Collect global functions and symbol names in symbols vector. 132727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease/// Collect external references in references vector. 133727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease/// Return LTO_READ_SUCCESS if there is no error. 134727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Leaseenum LTOStatus 135727dee178a392d20eb050d0c446f2fcc29058fa1Victoria LeaseLinkTimeOptimizer::readLLVMObjectFile(const std::string &InputFilename, 136727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease NameToSymbolMap &symbols, 137727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease std::set<std::string> &references) 138727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease{ 139727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Module *m = getModule(InputFilename); 140727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease if (!m) 141727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease return LTO_READ_FAILURE; 142727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 143727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease // Use mangler to add GlobalPrefix to names to match linker names. 144727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease // FIXME : Instead of hard coding "-" use GlobalPrefix. 145727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Mangler mangler(*m, "_"); 146727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 147727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease modules.push_back(m); 148727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 149727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease for (Module::iterator f = m->begin(), e = m->end(); f != e; ++f) { 150727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 151727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease LTOLinkageTypes lt = getLTOLinkageType(f); 152049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 153049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (!f->isExternal() && lt != LTOInternalLinkage 154049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project && strncmp (f->getName().c_str(), "llvm.", 5)) { 155049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project LLVMSymbol *newSymbol = new LLVMSymbol(lt, f, f->getName(), 156049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project mangler.getValueName(f)); 157049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project symbols[newSymbol->getMangledName()] = newSymbol; 158049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project allSymbols[newSymbol->getMangledName()] = newSymbol; 159049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project } 160049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 161049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Collect external symbols referenced by this function. 162049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project for (Function::iterator b = f->begin(), fe = f->end(); b != fe; ++b) 163049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project for (BasicBlock::iterator i = b->begin(), be = b->end(); 164049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project i != be; ++i) 165049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project for (unsigned count = 0, total = i->getNumOperands(); 166049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project count != total; ++count) 167049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project findExternalRefs(i->getOperand(count), references, mangler); 168049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project } 169049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 170049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project for (Module::global_iterator v = m->global_begin(), e = m->global_end(); 171049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project v != e; ++v) { 172049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project LTOLinkageTypes lt = getLTOLinkageType(v); 173049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (!v->isExternal() && lt != LTOInternalLinkage 174049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project && strncmp (v->getName().c_str(), "llvm.", 5)) { 175049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project LLVMSymbol *newSymbol = new LLVMSymbol(lt, v, v->getName(), 176049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project mangler.getValueName(v)); 177049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project symbols[newSymbol->getMangledName()] = newSymbol; 178049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project allSymbols[newSymbol->getMangledName()] = newSymbol; 179049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 180049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project for (unsigned count = 0, total = v->getNumOperands(); 181049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project count != total; ++count) 182049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project findExternalRefs(v->getOperand(count), references, mangler); 183049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 184049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project } 185049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project } 186049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 187049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return LTO_READ_SUCCESS; 188049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project} 189049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 190049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project/// Optimize module M using various IPO passes. Use exportList to 191049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project/// internalize selected symbols. Target platform is selected 192049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project/// based on information available to module M. No new target 193049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project/// features are selected. 194049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Projectstatic enum LTOStatus lto_optimize(Module *M, std::ostream &Out, 195049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::vector<const char *> &exportList) 196aacb8e1368a883fcbc9fe64fd0e460cef9c9b20cNick Kralevich{ 197049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Instantiate the pass manager to organize the passes. 198049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project PassManager Passes; 199049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 200049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Collect Target info 201049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::string Err; 202049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project const TargetMachineRegistry::Entry* March = 203049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project TargetMachineRegistry::getClosestStaticTargetForModule(*M, Err); 204049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 205049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (March == 0) 206049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return LTO_NO_TARGET; 207049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 208049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Create target 209049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::string Features; 210049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::auto_ptr<TargetMachine> target(March->CtorFn(*M, Features)); 211049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (!target.get()) 212049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return LTO_NO_TARGET; 213049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 214049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project TargetMachine &Target = *target.get(); 215049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 216049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Start off with a verification pass. 217049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createVerifierPass()); 218049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 219049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Add an appropriate TargetData instance for this module... 220049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(new TargetData(*Target.getTargetData())); 221049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 222049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Often if the programmer does not specify proper prototypes for the 223049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // functions they are calling, they end up calling a vararg version of the 224049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // function that does not get a body filled in (the real function has typed 225049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // arguments). This pass merges the two functions. 226049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createFunctionResolvingPass()); 227049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 228049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Internalize symbols if export list is nonemty 229049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (!exportList.empty()) 230049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createInternalizePass(exportList)); 231049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 232049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Now that we internalized some globals, see if we can hack on them! 233049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createGlobalOptimizerPass()); 234049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 235049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Linking modules together can lead to duplicated global constants, only 236049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // keep one copy of each constant... 237049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createConstantMergePass()); 238049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 239049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // If the -s command line option was specified, strip the symbols out of the 240049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // resulting program to make it smaller. -s is a GLD option that we are 241049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // supporting. 242049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createStripSymbolsPass()); 243049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 244049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Propagate constants at call sites into the functions they call. 245049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createIPConstantPropagationPass()); 246049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 247049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Remove unused arguments from functions... 248049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createDeadArgEliminationPass()); 249049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 250049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createFunctionInliningPass()); // Inline small functions 251049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 252049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createPruneEHPass()); // Remove dead EH info 253049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 254049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createGlobalDCEPass()); // Remove dead functions 255049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 256049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // If we didn't decide to inline a function, check to see if we can 257049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // transform it to pass arguments by value instead of by reference. 258049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createArgumentPromotionPass()); 259049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 260049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // The IPO passes may leave cruft around. Clean up after them. 261049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.add(createInstructionCombiningPass()); 262049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 263727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Passes.add(createScalarReplAggregatesPass()); // Break up allocas 264727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 265727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease // Run a few AA driven optimizations here and now, to cleanup the code. 266ec0bab5697bb31ba980810145f62e3799946ec60Victoria Lease Passes.add(createGlobalsModRefPass()); // IP alias analysis 267727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 268727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Passes.add(createLICMPass()); // Hoist loop invariants 269ec0bab5697bb31ba980810145f62e3799946ec60Victoria Lease Passes.add(createLoadValueNumberingPass()); // GVN for load instrs 270727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Passes.add(createGCSEPass()); // Remove common subexprs 271727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Passes.add(createDeadStoreEliminationPass()); // Nuke dead stores 272727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 273727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease // Cleanup and simplify the code after the scalar optimizations. 274727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Passes.add(createInstructionCombiningPass()); 275727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 276727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease // Delete basic blocks, which optimization passes may have killed... 277727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Passes.add(createCFGSimplificationPass()); 278727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 279727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease // Now that we have optimized the program, discard unreachable functions... 280727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Passes.add(createGlobalDCEPass()); 281727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 282727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease // Make sure everything is still good. 283727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Passes.add(createVerifierPass()); 284727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 285727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease FunctionPassManager *CodeGenPasses = 286727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease new FunctionPassManager(new ExistingModuleProvider(M)); 287727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 288727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease CodeGenPasses->add(new TargetData(*Target.getTargetData())); 289727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Target.addPassesToEmitFile(*CodeGenPasses, Out, TargetMachine::AssemblyFile, 290727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease true); 291049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 292049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Run our queue of passes all at once now, efficiently. 293049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project Passes.run(*M); 294049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 295049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Run the code generator, if present. 296049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project CodeGenPasses->doInitialization(); 297727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I) { 298049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (!I->isExternal()) 299049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project CodeGenPasses->run(*I); 300049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project } 301049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project CodeGenPasses->doFinalization(); 302049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 303049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return LTO_OPT_SUCCESS; 304049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project} 305049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 306049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project///Link all modules together and optimize them using IPO. Generate 307049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project/// native object file using OutputFilename 308049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project/// Return appropriate LTOStatus. 309049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Projectenum LTOStatus 310049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source ProjectLinkTimeOptimizer::optimizeModules(const std::string &OutputFilename, 311049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::vector<const char *> &exportList, 312049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::string &targetTriple) 313049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project{ 314aacb8e1368a883fcbc9fe64fd0e460cef9c9b20cNick Kralevich if (modules.empty()) 315aacb8e1368a883fcbc9fe64fd0e460cef9c9b20cNick Kralevich return LTO_NO_WORK; 316aacb8e1368a883fcbc9fe64fd0e460cef9c9b20cNick Kralevich 317aacb8e1368a883fcbc9fe64fd0e460cef9c9b20cNick Kralevich std::ios::openmode io_mode = 318aacb8e1368a883fcbc9fe64fd0e460cef9c9b20cNick Kralevich std::ios::out | std::ios::trunc | std::ios::binary; 319aacb8e1368a883fcbc9fe64fd0e460cef9c9b20cNick Kralevich std::string *errMsg = NULL; 320727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease Module *bigOne = modules[0]; 321aacb8e1368a883fcbc9fe64fd0e460cef9c9b20cNick Kralevich Linker theLinker("LinkTimeOptimizer", bigOne, false); 322aacb8e1368a883fcbc9fe64fd0e460cef9c9b20cNick Kralevich for (unsigned i = 1, e = modules.size(); i != e; ++i) 323049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (theLinker.LinkModules(bigOne, modules[i], errMsg)) 324049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return LTO_MODULE_MERGE_FAILURE; 325049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 326049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#if 0 327049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Enable this when -save-temps is used 328049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::ofstream Out("big.bc", io_mode); 329049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project WriteBytecodeToFile(bigOne, Out, true); 330049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project#endif 331049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 332049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Strip leading underscore because it was added to match names 333049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // seen by linker. 334049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project for (unsigned i = 0, e = exportList.size(); i != e; ++i) { 335049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project const char *name = exportList[i]; 336049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project NameToSymbolMap::iterator itr = allSymbols.find(name); 337049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (itr != allSymbols.end()) 338049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project exportList[i] = allSymbols[name]->getName(); 339049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project } 340049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 341049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project sys::Path tmpAsmFilePath("/tmp/"); 342049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::string ErrMsg; 343049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (tmpAsmFilePath.createTemporaryFileOnDisk(&ErrMsg)) { 344049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::cerr << "lto: " << ErrMsg << "\n"; 345727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease return LTO_WRITE_FAILURE; 346727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease } 347049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project sys::RemoveFileOnSignal(tmpAsmFilePath); 348049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 349049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::ofstream asmFile(tmpAsmFilePath.c_str(), io_mode); 350049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (!asmFile.is_open() || asmFile.bad()) { 351049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (tmpAsmFilePath.exists()) 352049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project tmpAsmFilePath.eraseFromDisk(); 353049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return LTO_WRITE_FAILURE; 354049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project } 355049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 356049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project enum LTOStatus status = lto_optimize(bigOne, asmFile, exportList); 357049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project asmFile.close(); 358049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (status != LTO_OPT_SUCCESS) { 359049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project tmpAsmFilePath.eraseFromDisk(); 360049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return status; 361049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project } 362727dee178a392d20eb050d0c446f2fcc29058fa1Victoria Lease 363049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project targetTriple = bigOne->getTargetTriple(); 364049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 365049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Run GCC to assemble and link the program into native code. 366049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // 367049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // Note: 368049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // We can't just assemble and link the file with the system assembler 369049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // and linker because we don't know where to put the _start symbol. 370049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project // GCC mysteriously knows how to do it. 371049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project const sys::Path gcc = FindExecutable("gcc", "/"); 372049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project if (gcc.isEmpty()) { 373049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project tmpAsmFilePath.eraseFromDisk(); 374049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return LTO_ASM_FAILURE; 375049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project } 376049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 377049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project std::vector<const char*> args; 378049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project args.push_back(gcc.c_str()); 379049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project args.push_back("-c"); 380049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project args.push_back("-x"); 381049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project args.push_back("assembler"); 382049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project args.push_back("-o"); 383049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project args.push_back(OutputFilename.c_str()); 384049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project args.push_back(tmpAsmFilePath.c_str()); 385049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project args.push_back(0); 386049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 387049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project sys::Program::ExecuteAndWait(gcc, &args[0], 0, 0, 1); 388049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 389049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project tmpAsmFilePath.eraseFromDisk(); 390049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project 391049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project return LTO_OPT_SUCCESS; 392049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project} 393049d6fea481044fcc000e7782e5bc7046fc70844The Android Open Source Project