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This should make sure that most new uses use the std prefix. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210835 91177308-0d34-0410-b5e6-96231b3b80d8
591 lines
20 KiB
C++
591 lines
20 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 "llvm/LTO/LTOCodeGenerator.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/Bitcode/ReaderWriter.h"
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#include "llvm/CodeGen/RuntimeLibcalls.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/DiagnosticInfo.h"
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#include "llvm/IR/DiagnosticPrinter.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/LTO/LTOModule.h"
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#include "llvm/Linker/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/raw_ostream.h"
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#include "llvm/Target/TargetLibraryInfo.h"
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#include "llvm/Target/TargetLowering.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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#include <system_error>
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using namespace llvm;
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using std::error_code;
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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()), IRLinker(new Module("ld-temp.o", Context)),
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TargetMach(nullptr), EmitDwarfDebugInfo(false),
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ScopeRestrictionsDone(false), CodeModel(LTO_CODEGEN_PIC_MODEL_DEFAULT),
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NativeObjectFile(nullptr), DiagHandler(nullptr), DiagContext(nullptr) {
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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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TargetMach = nullptr;
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NativeObjectFile = nullptr;
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IRLinker.deleteModule();
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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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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 = IRLinker.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::setTargetOptions(TargetOptions options) {
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Options.LessPreciseFPMADOption = options.LessPreciseFPMADOption;
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Options.NoFramePointerElim = options.NoFramePointerElim;
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Options.AllowFPOpFusion = options.AllowFPOpFusion;
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Options.UnsafeFPMath = options.UnsafeFPMath;
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Options.NoInfsFPMath = options.NoInfsFPMath;
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Options.NoNaNsFPMath = options.NoNaNsFPMath;
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Options.HonorSignDependentRoundingFPMathOption =
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options.HonorSignDependentRoundingFPMathOption;
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Options.UseSoftFloat = options.UseSoftFloat;
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Options.FloatABIType = options.FloatABIType;
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Options.NoZerosInBSS = options.NoZerosInBSS;
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Options.GuaranteedTailCallOpt = options.GuaranteedTailCallOpt;
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Options.DisableTailCalls = options.DisableTailCalls;
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Options.StackAlignmentOverride = options.StackAlignmentOverride;
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Options.TrapFuncName = options.TrapFuncName;
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Options.PositionIndependentExecutable = options.PositionIndependentExecutable;
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Options.UseInitArray = options.UseInitArray;
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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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case LTO_CODEGEN_PIC_MODEL_DEFAULT:
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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_None);
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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(IRLinker.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,
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bool disableOpt,
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bool disableInline,
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bool disableGVNLoadPRE,
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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(), disableOpt, disableInline,
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disableGVNLoadPRE, 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,
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bool disableOpt,
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bool disableInline,
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bool disableGVNLoadPRE,
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std::string& errMsg) {
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const char *name;
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if (!compile_to_file(&name, disableOpt, disableInline, disableGVNLoadPRE,
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errMsg))
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return nullptr;
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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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std::unique_ptr<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 nullptr;
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}
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NativeObjectFile = BuffPtr.release();
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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)
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return nullptr;
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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)
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return true;
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std::string TripleStr = IRLinker.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)
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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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case LTO_CODEGEN_PIC_MODEL_DEFAULT:
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// RelocModel is already the default, so leave it that way.
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break;
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}
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// Construct LTOModule, hand over ownership of module and target. Use MAttr as
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// the default set of features.
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SubtargetFeatures Features(MAttr);
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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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else if (Triple.getArch() == llvm::Triple::arm64 ||
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Triple.getArch() == llvm::Triple::aarch64)
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MCpu = "cyclone";
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}
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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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const ArrayRef<StringRef> &Libcalls,
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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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// There are no restrictions to apply to declarations.
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if (GV.isDeclaration())
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return;
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// There is nothing more restrictive than private linkage.
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if (GV.hasPrivateLinkage())
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return;
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SmallString<64> Buffer;
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TargetMach->getNameWithPrefix(Buffer, &GV, Mangler);
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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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// Conservatively append user-supplied runtime library functions to
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// llvm.compiler.used. These could be internalized and deleted by
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// optimizations like -globalopt, causing problems when later optimizations
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// add new library calls (e.g., llvm.memset => memset and printf => puts).
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// Leave it to the linker to remove any dead code (e.g. with -dead_strip).
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if (isa<Function>(GV) &&
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std::binary_search(Libcalls.begin(), Libcalls.end(), GV.getName()))
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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) 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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static void accumulateAndSortLibcalls(std::vector<StringRef> &Libcalls,
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const TargetLibraryInfo& TLI,
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const TargetLowering *Lowering)
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{
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// TargetLibraryInfo has info on C runtime library calls on the current
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// target.
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for (unsigned I = 0, E = static_cast<unsigned>(LibFunc::NumLibFuncs);
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I != E; ++I) {
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LibFunc::Func F = static_cast<LibFunc::Func>(I);
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if (TLI.has(F))
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Libcalls.push_back(TLI.getName(F));
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}
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// TargetLowering has info on library calls that CodeGen expects to be
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// available, both from the C runtime and compiler-rt.
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if (Lowering)
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for (unsigned I = 0, E = static_cast<unsigned>(RTLIB::UNKNOWN_LIBCALL);
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I != E; ++I)
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if (const char *Name
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= Lowering->getLibcallName(static_cast<RTLIB::Libcall>(I)))
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Libcalls.push_back(Name);
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array_pod_sort(Libcalls.begin(), Libcalls.end());
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Libcalls.erase(std::unique(Libcalls.begin(), Libcalls.end()),
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Libcalls.end());
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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 = IRLinker.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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passes.add(createDebugInfoVerifierPass());
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// mark which symbols can not be internalized
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Mangler Mangler(TargetMach->getDataLayout());
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std::vector<const char*> MustPreserveList;
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SmallPtrSet<GlobalValue*, 8> AsmUsed;
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std::vector<StringRef> Libcalls;
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TargetLibraryInfo TLI(Triple(TargetMach->getTargetTriple()));
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accumulateAndSortLibcalls(Libcalls, TLI, TargetMach->getTargetLowering());
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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, Libcalls, 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, Libcalls, 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, Libcalls, 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 (auto *GV : AsmUsed) {
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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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bool DisableOpt,
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bool DisableInline,
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bool DisableGVNLoadPRE,
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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 = IRLinker.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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passes.add(createDebugInfoVerifierPass());
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// Add an appropriate DataLayout instance for this module...
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mergedModule->setDataLayout(TargetMach->getDataLayout());
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passes.add(new DataLayoutPass(mergedModule));
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// Add appropriate TargetLibraryInfo for this module.
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passes.add(new TargetLibraryInfo(Triple(TargetMach->getTargetTriple())));
|
|
|
|
TargetMach->addAnalysisPasses(passes);
|
|
|
|
// Enabling internalize here would use its AllButMain variant. It
|
|
// keeps only main if it exists and does nothing for libraries. Instead
|
|
// we create the pass ourselves with the symbol list provided by the linker.
|
|
if (!DisableOpt)
|
|
PassManagerBuilder().populateLTOPassManager(passes,
|
|
/*Internalize=*/false,
|
|
!DisableInline,
|
|
DisableGVNLoadPRE);
|
|
|
|
// Make sure everything is still good.
|
|
passes.add(createVerifierPass());
|
|
passes.add(createDebugInfoVerifierPass());
|
|
|
|
PassManager codeGenPasses;
|
|
|
|
codeGenPasses.add(new DataLayoutPass(mergedModule));
|
|
|
|
formatted_raw_ostream Out(out);
|
|
|
|
// If the bitcode files contain ARC code and were compiled with optimization,
|
|
// the ObjCARCContractPass must be run, so do it unconditionally here.
|
|
codeGenPasses.add(createObjCARCContractPass());
|
|
|
|
if (TargetMach->addPassesToEmitFile(codeGenPasses, Out,
|
|
TargetMachine::CGFT_ObjectFile)) {
|
|
errMsg = "target file type not supported";
|
|
return false;
|
|
}
|
|
|
|
// Run our queue of passes all at once now, efficiently.
|
|
passes.run(*mergedModule);
|
|
|
|
// Run the code generator, and write assembly file
|
|
codeGenPasses.run(*mergedModule);
|
|
|
|
return true;
|
|
}
|
|
|
|
/// setCodeGenDebugOptions - Set codegen debugging options to aid in debugging
|
|
/// LTO problems.
|
|
void LTOCodeGenerator::setCodeGenDebugOptions(const char *options) {
|
|
for (std::pair<StringRef, StringRef> o = getToken(options);
|
|
!o.first.empty(); o = getToken(o.second)) {
|
|
// ParseCommandLineOptions() expects argv[0] to be program name. Lazily add
|
|
// that.
|
|
if (CodegenOptions.empty())
|
|
CodegenOptions.push_back(strdup("libLLVMLTO"));
|
|
CodegenOptions.push_back(strdup(o.first.str().c_str()));
|
|
}
|
|
}
|
|
|
|
void LTOCodeGenerator::parseCodeGenDebugOptions() {
|
|
// if options were requested, set them
|
|
if (!CodegenOptions.empty())
|
|
cl::ParseCommandLineOptions(CodegenOptions.size(),
|
|
const_cast<char **>(&CodegenOptions[0]));
|
|
}
|
|
|
|
void LTOCodeGenerator::DiagnosticHandler(const DiagnosticInfo &DI,
|
|
void *Context) {
|
|
((LTOCodeGenerator *)Context)->DiagnosticHandler2(DI);
|
|
}
|
|
|
|
void LTOCodeGenerator::DiagnosticHandler2(const DiagnosticInfo &DI) {
|
|
// Map the LLVM internal diagnostic severity to the LTO diagnostic severity.
|
|
lto_codegen_diagnostic_severity_t Severity;
|
|
switch (DI.getSeverity()) {
|
|
case DS_Error:
|
|
Severity = LTO_DS_ERROR;
|
|
break;
|
|
case DS_Warning:
|
|
Severity = LTO_DS_WARNING;
|
|
break;
|
|
case DS_Remark:
|
|
Severity = LTO_DS_REMARK;
|
|
break;
|
|
case DS_Note:
|
|
Severity = LTO_DS_NOTE;
|
|
break;
|
|
}
|
|
// Create the string that will be reported to the external diagnostic handler.
|
|
std::string MsgStorage;
|
|
raw_string_ostream Stream(MsgStorage);
|
|
DiagnosticPrinterRawOStream DP(Stream);
|
|
DI.print(DP);
|
|
Stream.flush();
|
|
|
|
// If this method has been called it means someone has set up an external
|
|
// diagnostic handler. Assert on that.
|
|
assert(DiagHandler && "Invalid diagnostic handler");
|
|
(*DiagHandler)(Severity, MsgStorage.c_str(), DiagContext);
|
|
}
|
|
|
|
void
|
|
LTOCodeGenerator::setDiagnosticHandler(lto_diagnostic_handler_t DiagHandler,
|
|
void *Ctxt) {
|
|
this->DiagHandler = DiagHandler;
|
|
this->DiagContext = Ctxt;
|
|
if (!DiagHandler)
|
|
return Context.setDiagnosticHandler(nullptr, nullptr);
|
|
// Register the LTOCodeGenerator stub in the LLVMContext to forward the
|
|
// diagnostic to the external DiagHandler.
|
|
Context.setDiagnosticHandler(LTOCodeGenerator::DiagnosticHandler, this);
|
|
}
|