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I am about to patch this code, and this makes the diff far more readable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189982 91177308-0d34-0410-b5e6-96231b3b80d8
459 lines
14 KiB
C++
459 lines
14 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 "LTOCodeGenerator.h"
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#include "LTOModule.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/Verifier.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/Config/config.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Linker.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/PassManager.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "llvm/Support/system_error.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/IPO/PassManagerBuilder.h"
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#include "llvm/Transforms/ObjCARC.h"
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using namespace llvm;
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static cl::opt<bool>
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DisableOpt("disable-opt", cl::init(false),
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cl::desc("Do not run any optimization passes"));
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static cl::opt<bool>
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DisableInline("disable-inlining", cl::init(false),
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cl::desc("Do not run the inliner pass"));
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static cl::opt<bool>
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DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
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cl::desc("Do not run the GVN load PRE pass"));
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const char* LTOCodeGenerator::getVersionString() {
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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()), Linker(new Module("ld-temp.o", Context)),
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TargetMach(NULL), EmitDwarfDebugInfo(false), ScopeRestrictionsDone(false),
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CodeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC), NativeObjectFile(NULL) {
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmPrinters();
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initializeLTOPasses();
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}
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LTOCodeGenerator::~LTOCodeGenerator() {
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delete TargetMach;
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delete NativeObjectFile;
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delete Linker.getModule();
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for (std::vector<char *>::iterator I = CodegenOptions.begin(),
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E = CodegenOptions.end();
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I != E; ++I)
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free(*I);
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}
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// Initialize LTO passes. Please keep this funciton in sync with
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// PassManagerBuilder::populateLTOPassManager(), and make sure all LTO
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// passes are initialized.
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//
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void LTOCodeGenerator::initializeLTOPasses() {
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PassRegistry &R = *PassRegistry::getPassRegistry();
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initializeInternalizePassPass(R);
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initializeIPSCCPPass(R);
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initializeGlobalOptPass(R);
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initializeConstantMergePass(R);
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initializeDAHPass(R);
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initializeInstCombinerPass(R);
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initializeSimpleInlinerPass(R);
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initializePruneEHPass(R);
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initializeGlobalDCEPass(R);
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initializeArgPromotionPass(R);
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initializeJumpThreadingPass(R);
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initializeSROAPass(R);
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initializeSROA_DTPass(R);
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initializeSROA_SSAUpPass(R);
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initializeFunctionAttrsPass(R);
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initializeGlobalsModRefPass(R);
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initializeLICMPass(R);
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initializeGVNPass(R);
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initializeMemCpyOptPass(R);
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initializeDCEPass(R);
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initializeCFGSimplifyPassPass(R);
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}
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bool LTOCodeGenerator::addModule(LTOModule* mod, std::string& errMsg) {
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bool ret = Linker.linkInModule(mod->getLLVVMModule(), &errMsg);
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const std::vector<const char*> &undefs = mod->getAsmUndefinedRefs();
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for (int i = 0, e = undefs.size(); i != e; ++i)
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AsmUndefinedRefs[undefs[i]] = 1;
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return !ret;
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}
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void LTOCodeGenerator::setDebugInfo(lto_debug_model debug) {
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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;
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case LTO_DEBUG_MODEL_DWARF:
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EmitDwarfDebugInfo = true;
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return;
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}
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llvm_unreachable("Unknown debug format!");
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}
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void LTOCodeGenerator::setCodePICModel(lto_codegen_model model) {
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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;
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}
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llvm_unreachable("Unknown PIC model!");
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}
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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 false;
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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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tool_output_file Out(path, ErrInfo, sys::fs::F_Binary);
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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 false;
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}
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// write bitcode to it
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WriteBitcodeToFile(Linker.getModule(), Out.os());
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Out.os().close();
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if (Out.os().has_error()) {
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errMsg = "could not write bitcode file: ";
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errMsg += path;
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Out.os().clear_error();
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return false;
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}
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Out.keep();
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return true;
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}
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bool LTOCodeGenerator::compile_to_file(const char** name, std::string& errMsg) {
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// make unique temp .o file to put generated object file
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SmallString<128> Filename;
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int FD;
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error_code EC = sys::fs::createTemporaryFile("lto-llvm", "o", FD, Filename);
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if (EC) {
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errMsg = EC.message();
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return false;
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}
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// generate object file
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tool_output_file objFile(Filename.c_str(), FD);
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bool genResult = generateObjectFile(objFile.os(), errMsg);
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objFile.os().close();
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if (objFile.os().has_error()) {
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objFile.os().clear_error();
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sys::fs::remove(Twine(Filename));
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return false;
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}
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objFile.keep();
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if (!genResult) {
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sys::fs::remove(Twine(Filename));
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return false;
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}
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NativeObjectPath = Filename.c_str();
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*name = NativeObjectPath.c_str();
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return true;
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}
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const void* LTOCodeGenerator::compile(size_t* length, std::string& errMsg) {
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const char *name;
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if (!compile_to_file(&name, errMsg))
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return NULL;
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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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OwningPtr<MemoryBuffer> BuffPtr;
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if (error_code ec = MemoryBuffer::getFile(name, BuffPtr, -1, false)) {
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errMsg = ec.message();
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sys::fs::remove(NativeObjectPath);
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return NULL;
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}
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NativeObjectFile = BuffPtr.take();
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// remove temp files
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sys::fs::remove(NativeObjectPath);
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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::determineTarget(std::string &errMsg) {
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if (TargetMach != NULL)
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return 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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const_cast<char **>(&CodegenOptions[0]));
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std::string TripleStr = Linker.getModule()->getTargetTriple();
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if (TripleStr.empty())
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TripleStr = sys::getDefaultTargetTriple();
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llvm::Triple Triple(TripleStr);
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// create target machine from info for merged modules
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const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
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if (march == NULL)
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return false;
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// The relocation model is actually a static member of TargetMachine and
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// needs to be set before the TargetMachine is instantiated.
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Reloc::Model RelocModel = Reloc::Default;
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switch (CodeModel) {
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case LTO_CODEGEN_PIC_MODEL_STATIC:
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RelocModel = Reloc::Static;
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break;
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case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
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RelocModel = Reloc::PIC_;
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break;
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case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
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RelocModel = Reloc::DynamicNoPIC;
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break;
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}
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// construct LTOModule, hand over ownership of module and target
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SubtargetFeatures Features;
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Features.getDefaultSubtargetFeatures(Triple);
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std::string FeatureStr = Features.getString();
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// Set a default CPU for Darwin triples.
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if (MCpu.empty() && Triple.isOSDarwin()) {
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if (Triple.getArch() == llvm::Triple::x86_64)
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MCpu = "core2";
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else if (Triple.getArch() == llvm::Triple::x86)
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MCpu = "yonah";
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}
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TargetOptions Options;
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LTOModule::getTargetOptions(Options);
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TargetMach = march->createTargetMachine(TripleStr, MCpu, FeatureStr, Options,
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RelocModel, CodeModel::Default,
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CodeGenOpt::Aggressive);
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return true;
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}
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void LTOCodeGenerator::
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applyRestriction(GlobalValue &GV,
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std::vector<const char*> &MustPreserveList,
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SmallPtrSet<GlobalValue*, 8> &AsmUsed,
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Mangler &Mangler) {
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SmallString<64> Buffer;
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Mangler.getNameWithPrefix(Buffer, &GV, false);
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if (GV.isDeclaration())
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return;
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if (MustPreserveSymbols.count(Buffer))
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MustPreserveList.push_back(GV.getName().data());
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if (AsmUndefinedRefs.count(Buffer))
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AsmUsed.insert(&GV);
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}
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static void findUsedValues(GlobalVariable *LLVMUsed,
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SmallPtrSet<GlobalValue*, 8> &UsedValues) {
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if (LLVMUsed == 0) return;
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ConstantArray *Inits = cast<ConstantArray>(LLVMUsed->getInitializer());
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for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i)
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if (GlobalValue *GV =
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dyn_cast<GlobalValue>(Inits->getOperand(i)->stripPointerCasts()))
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UsedValues.insert(GV);
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}
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void LTOCodeGenerator::applyScopeRestrictions() {
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if (ScopeRestrictionsDone)
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return;
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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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MCContext MContext(TargetMach->getMCAsmInfo(), TargetMach->getRegisterInfo(),
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NULL);
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Mangler Mangler(MContext, TargetMach);
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std::vector<const char*> MustPreserveList;
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SmallPtrSet<GlobalValue*, 8> AsmUsed;
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for (Module::iterator f = mergedModule->begin(),
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e = mergedModule->end(); f != e; ++f)
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applyRestriction(*f, MustPreserveList, AsmUsed, Mangler);
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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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applyRestriction(*v, MustPreserveList, AsmUsed, Mangler);
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for (Module::alias_iterator a = mergedModule->alias_begin(),
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e = mergedModule->alias_end(); a != e; ++a)
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applyRestriction(*a, MustPreserveList, AsmUsed, Mangler);
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GlobalVariable *LLVMCompilerUsed =
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mergedModule->getGlobalVariable("llvm.compiler.used");
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findUsedValues(LLVMCompilerUsed, AsmUsed);
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if (LLVMCompilerUsed)
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LLVMCompilerUsed->eraseFromParent();
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if (!AsmUsed.empty()) {
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llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(Context);
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std::vector<Constant*> asmUsed2;
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for (SmallPtrSet<GlobalValue*, 16>::const_iterator i = AsmUsed.begin(),
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e = AsmUsed.end(); i !=e; ++i) {
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GlobalValue *GV = *i;
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Constant *c = ConstantExpr::getBitCast(GV, i8PTy);
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asmUsed2.push_back(c);
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}
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llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, asmUsed2.size());
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LLVMCompilerUsed =
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new llvm::GlobalVariable(*mergedModule, ATy, false,
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llvm::GlobalValue::AppendingLinkage,
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llvm::ConstantArray::get(ATy, asmUsed2),
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"llvm.compiler.used");
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LLVMCompilerUsed->setSection("llvm.metadata");
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}
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passes.add(createInternalizePass(MustPreserveList));
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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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/// Optimize merged modules using various IPO passes
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bool LTOCodeGenerator::generateObjectFile(raw_ostream &out,
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std::string &errMsg) {
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if (!this->determineTarget(errMsg))
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return false;
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Module *mergedModule = Linker.getModule();
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// Mark which symbols can not be internalized
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this->applyScopeRestrictions();
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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 DataLayout instance for this module...
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passes.add(new DataLayout(*TargetMach->getDataLayout()));
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TargetMach->addAnalysisPasses(passes);
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// Enabling internalize here would use its AllButMain variant. It
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// keeps only main if it exists and does nothing for libraries. Instead
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// we create the pass ourselves with the symbol list provided by the linker.
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if (!DisableOpt)
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PassManagerBuilder().populateLTOPassManager(passes,
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/*Internalize=*/false,
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!DisableInline,
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DisableGVNLoadPRE);
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// Make sure everything is still good.
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passes.add(createVerifierPass());
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PassManager codeGenPasses;
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codeGenPasses.add(new DataLayout(*TargetMach->getDataLayout()));
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TargetMach->addAnalysisPasses(codeGenPasses);
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formatted_raw_ostream Out(out);
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// If the bitcode files contain ARC code and were compiled with optimization,
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// the ObjCARCContractPass must be run, so do it unconditionally here.
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codeGenPasses.add(createObjCARCContractPass());
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if (TargetMach->addPassesToEmitFile(codeGenPasses, Out,
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TargetMachine::CGFT_ObjectFile)) {
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errMsg = "target file type not supported";
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return false;
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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.run(*mergedModule);
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return true;
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}
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/// setCodeGenDebugOptions - Set codegen debugging options to aid in debugging
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/// LTO problems.
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void LTOCodeGenerator::setCodeGenDebugOptions(const char *options) {
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for (std::pair<StringRef, StringRef> o = getToken(options);
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!o.first.empty(); o = getToken(o.second)) {
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// ParseCommandLineOptions() expects argv[0] to be program name. Lazily add
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// that.
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if (CodegenOptions.empty())
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CodegenOptions.push_back(strdup("libLTO"));
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CodegenOptions.push_back(strdup(o.first.str().c_str()));
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}
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}
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