mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-07-24 22:24:54 +00:00
Move LTO support library to a component, allowing it to be tested
more reliably across platforms. Patch by Tom Roeder! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191343 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
4
lib/LTO/CMakeLists.txt
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4
lib/LTO/CMakeLists.txt
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@@ -0,0 +1,4 @@
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add_llvm_library(LLVMLTO
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LTOModule.cpp
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LTOCodeGenerator.cpp
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)
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22
lib/LTO/LLVMBuild.txt
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22
lib/LTO/LLVMBuild.txt
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@@ -0,0 +1,22 @@
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;===- ./lib/LTO/LLVMBuild.txt ----------------------------------*- Conf -*--===;
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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 is an LLVMBuild description file for the components in this subdirectory.
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;
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; For more information on the LLVMBuild system, please see:
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;
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; http://llvm.org/docs/LLVMBuild.html
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;
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;===------------------------------------------------------------------------===;
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[component_0]
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type = Library
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name = LTO
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parent = Libraries
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required_libraries = Analysis BitReader BitWriter Core IPO Linker MC MCParser Scalar Support Target Vectorize
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453
lib/LTO/LTOCodeGenerator.cpp
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453
lib/LTO/LTOCodeGenerator.cpp
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@@ -0,0 +1,453 @@
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//===-LTOCodeGenerator.cpp - LLVM Link Time Optimizer ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Link Time Optimization library. This library is
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// intended to be used by linker to optimize code at link time.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/LTO/LTOCodeGenerator.h"
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#include "llvm/LTO/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/TargetRegisterInfo.h"
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#include "llvm/Target/Mangler.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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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");
|
||||
findUsedValues(LLVMCompilerUsed, AsmUsed);
|
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if (LLVMCompilerUsed)
|
||||
LLVMCompilerUsed->eraseFromParent();
|
||||
|
||||
if (!AsmUsed.empty()) {
|
||||
llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(Context);
|
||||
std::vector<Constant*> asmUsed2;
|
||||
for (SmallPtrSet<GlobalValue*, 16>::const_iterator i = AsmUsed.begin(),
|
||||
e = AsmUsed.end(); i !=e; ++i) {
|
||||
GlobalValue *GV = *i;
|
||||
Constant *c = ConstantExpr::getBitCast(GV, i8PTy);
|
||||
asmUsed2.push_back(c);
|
||||
}
|
||||
|
||||
llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, asmUsed2.size());
|
||||
LLVMCompilerUsed =
|
||||
new llvm::GlobalVariable(*mergedModule, ATy, false,
|
||||
llvm::GlobalValue::AppendingLinkage,
|
||||
llvm::ConstantArray::get(ATy, asmUsed2),
|
||||
"llvm.compiler.used");
|
||||
|
||||
LLVMCompilerUsed->setSection("llvm.metadata");
|
||||
}
|
||||
|
||||
passes.add(createInternalizePass(MustPreserveList));
|
||||
|
||||
// apply scope restrictions
|
||||
passes.run(*mergedModule);
|
||||
|
||||
ScopeRestrictionsDone = true;
|
||||
}
|
||||
|
||||
/// Optimize merged modules using various IPO passes
|
||||
bool LTOCodeGenerator::generateObjectFile(raw_ostream &out,
|
||||
std::string &errMsg) {
|
||||
if (!this->determineTarget(errMsg))
|
||||
return false;
|
||||
|
||||
Module *mergedModule = Linker.getModule();
|
||||
|
||||
// Mark which symbols can not be internalized
|
||||
this->applyScopeRestrictions();
|
||||
|
||||
// Instantiate the pass manager to organize the passes.
|
||||
PassManager passes;
|
||||
|
||||
// Start off with a verification pass.
|
||||
passes.add(createVerifierPass());
|
||||
|
||||
// Add an appropriate DataLayout instance for this module...
|
||||
passes.add(new DataLayout(*TargetMach->getDataLayout()));
|
||||
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());
|
||||
|
||||
PassManager codeGenPasses;
|
||||
|
||||
codeGenPasses.add(new DataLayout(*TargetMach->getDataLayout()));
|
||||
TargetMach->addAnalysisPasses(codeGenPasses);
|
||||
|
||||
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()));
|
||||
}
|
||||
}
|
900
lib/LTO/LTOModule.cpp
Normal file
900
lib/LTO/LTOModule.cpp
Normal file
@@ -0,0 +1,900 @@
|
||||
//===-- LTOModule.cpp - LLVM Link Time Optimizer --------------------------===//
|
||||
//
|
||||
// The LLVM Compiler Infrastructure
|
||||
//
|
||||
// This file is distributed under the University of Illinois Open Source
|
||||
// License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
//
|
||||
// This file implements the Link Time Optimization library. This library is
|
||||
// intended to be used by linker to optimize code at link time.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#include "llvm/LTO/LTOModule.h"
|
||||
#include "llvm/ADT/OwningPtr.h"
|
||||
#include "llvm/ADT/Triple.h"
|
||||
#include "llvm/Bitcode/ReaderWriter.h"
|
||||
#include "llvm/IR/Constants.h"
|
||||
#include "llvm/IR/LLVMContext.h"
|
||||
#include "llvm/IR/Module.h"
|
||||
#include "llvm/MC/MCExpr.h"
|
||||
#include "llvm/MC/MCInst.h"
|
||||
#include "llvm/MC/MCInstrInfo.h"
|
||||
#include "llvm/MC/MCParser/MCAsmParser.h"
|
||||
#include "llvm/MC/MCStreamer.h"
|
||||
#include "llvm/MC/MCSubtargetInfo.h"
|
||||
#include "llvm/MC/MCSymbol.h"
|
||||
#include "llvm/MC/MCTargetAsmParser.h"
|
||||
#include "llvm/MC/SubtargetFeature.h"
|
||||
#include "llvm/Support/CommandLine.h"
|
||||
#include "llvm/Support/Host.h"
|
||||
#include "llvm/Support/FileSystem.h"
|
||||
#include "llvm/Support/MemoryBuffer.h"
|
||||
#include "llvm/Support/Path.h"
|
||||
#include "llvm/Support/SourceMgr.h"
|
||||
#include "llvm/Support/TargetRegistry.h"
|
||||
#include "llvm/Support/TargetSelect.h"
|
||||
#include "llvm/Support/system_error.h"
|
||||
#include "llvm/Target/TargetRegisterInfo.h"
|
||||
using namespace llvm;
|
||||
|
||||
static cl::opt<bool>
|
||||
EnableFPMAD("enable-fp-mad",
|
||||
cl::desc("Enable less precise MAD instructions to be generated"),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<bool>
|
||||
DisableFPElim("disable-fp-elim",
|
||||
cl::desc("Disable frame pointer elimination optimization"),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<bool>
|
||||
EnableUnsafeFPMath("enable-unsafe-fp-math",
|
||||
cl::desc("Enable optimizations that may decrease FP precision"),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<bool>
|
||||
EnableNoInfsFPMath("enable-no-infs-fp-math",
|
||||
cl::desc("Enable FP math optimizations that assume no +-Infs"),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<bool>
|
||||
EnableNoNaNsFPMath("enable-no-nans-fp-math",
|
||||
cl::desc("Enable FP math optimizations that assume no NaNs"),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<bool>
|
||||
EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
|
||||
cl::Hidden,
|
||||
cl::desc("Force codegen to assume rounding mode can change dynamically"),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<bool>
|
||||
GenerateSoftFloatCalls("soft-float",
|
||||
cl::desc("Generate software floating point library calls"),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<llvm::FloatABI::ABIType>
|
||||
FloatABIForCalls("float-abi",
|
||||
cl::desc("Choose float ABI type"),
|
||||
cl::init(FloatABI::Default),
|
||||
cl::values(
|
||||
clEnumValN(FloatABI::Default, "default",
|
||||
"Target default float ABI type"),
|
||||
clEnumValN(FloatABI::Soft, "soft",
|
||||
"Soft float ABI (implied by -soft-float)"),
|
||||
clEnumValN(FloatABI::Hard, "hard",
|
||||
"Hard float ABI (uses FP registers)"),
|
||||
clEnumValEnd));
|
||||
|
||||
static cl::opt<llvm::FPOpFusion::FPOpFusionMode>
|
||||
FuseFPOps("fp-contract",
|
||||
cl::desc("Enable aggresive formation of fused FP ops"),
|
||||
cl::init(FPOpFusion::Standard),
|
||||
cl::values(
|
||||
clEnumValN(FPOpFusion::Fast, "fast",
|
||||
"Fuse FP ops whenever profitable"),
|
||||
clEnumValN(FPOpFusion::Standard, "on",
|
||||
"Only fuse 'blessed' FP ops."),
|
||||
clEnumValN(FPOpFusion::Strict, "off",
|
||||
"Only fuse FP ops when the result won't be effected."),
|
||||
clEnumValEnd));
|
||||
|
||||
static cl::opt<bool>
|
||||
DontPlaceZerosInBSS("nozero-initialized-in-bss",
|
||||
cl::desc("Don't place zero-initialized symbols into bss section"),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<bool>
|
||||
EnableGuaranteedTailCallOpt("tailcallopt",
|
||||
cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<bool>
|
||||
DisableTailCalls("disable-tail-calls",
|
||||
cl::desc("Never emit tail calls"),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<unsigned>
|
||||
OverrideStackAlignment("stack-alignment",
|
||||
cl::desc("Override default stack alignment"),
|
||||
cl::init(0));
|
||||
|
||||
static cl::opt<std::string>
|
||||
TrapFuncName("trap-func", cl::Hidden,
|
||||
cl::desc("Emit a call to trap function rather than a trap instruction"),
|
||||
cl::init(""));
|
||||
|
||||
static cl::opt<bool>
|
||||
EnablePIE("enable-pie",
|
||||
cl::desc("Assume the creation of a position independent executable."),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<bool>
|
||||
SegmentedStacks("segmented-stacks",
|
||||
cl::desc("Use segmented stacks if possible."),
|
||||
cl::init(false));
|
||||
|
||||
static cl::opt<bool>
|
||||
UseInitArray("use-init-array",
|
||||
cl::desc("Use .init_array instead of .ctors."),
|
||||
cl::init(false));
|
||||
|
||||
LTOModule::LTOModule(llvm::Module *m, llvm::TargetMachine *t)
|
||||
: _module(m), _target(t),
|
||||
_context(_target->getMCAsmInfo(), _target->getRegisterInfo(), NULL),
|
||||
_mangler(_context, t) {}
|
||||
|
||||
/// isBitcodeFile - Returns 'true' if the file (or memory contents) is LLVM
|
||||
/// bitcode.
|
||||
bool LTOModule::isBitcodeFile(const void *mem, size_t length) {
|
||||
return sys::fs::identify_magic(StringRef((const char *)mem, length)) ==
|
||||
sys::fs::file_magic::bitcode;
|
||||
}
|
||||
|
||||
bool LTOModule::isBitcodeFile(const char *path) {
|
||||
sys::fs::file_magic type;
|
||||
if (sys::fs::identify_magic(path, type))
|
||||
return false;
|
||||
return type == sys::fs::file_magic::bitcode;
|
||||
}
|
||||
|
||||
/// isBitcodeFileForTarget - Returns 'true' if the file (or memory contents) is
|
||||
/// LLVM bitcode for the specified triple.
|
||||
bool LTOModule::isBitcodeFileForTarget(const void *mem, size_t length,
|
||||
const char *triplePrefix) {
|
||||
MemoryBuffer *buffer = makeBuffer(mem, length);
|
||||
if (!buffer)
|
||||
return false;
|
||||
return isTargetMatch(buffer, triplePrefix);
|
||||
}
|
||||
|
||||
bool LTOModule::isBitcodeFileForTarget(const char *path,
|
||||
const char *triplePrefix) {
|
||||
OwningPtr<MemoryBuffer> buffer;
|
||||
if (MemoryBuffer::getFile(path, buffer))
|
||||
return false;
|
||||
return isTargetMatch(buffer.take(), triplePrefix);
|
||||
}
|
||||
|
||||
/// isTargetMatch - Returns 'true' if the memory buffer is for the specified
|
||||
/// target triple.
|
||||
bool LTOModule::isTargetMatch(MemoryBuffer *buffer, const char *triplePrefix) {
|
||||
std::string Triple = getBitcodeTargetTriple(buffer, getGlobalContext());
|
||||
delete buffer;
|
||||
return strncmp(Triple.c_str(), triplePrefix, strlen(triplePrefix)) == 0;
|
||||
}
|
||||
|
||||
/// makeLTOModule - Create an LTOModule. N.B. These methods take ownership of
|
||||
/// the buffer.
|
||||
LTOModule *LTOModule::makeLTOModule(const char *path, std::string &errMsg) {
|
||||
OwningPtr<MemoryBuffer> buffer;
|
||||
if (error_code ec = MemoryBuffer::getFile(path, buffer)) {
|
||||
errMsg = ec.message();
|
||||
return NULL;
|
||||
}
|
||||
return makeLTOModule(buffer.take(), errMsg);
|
||||
}
|
||||
|
||||
LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
|
||||
size_t size, std::string &errMsg) {
|
||||
return makeLTOModule(fd, path, size, 0, errMsg);
|
||||
}
|
||||
|
||||
LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
|
||||
size_t map_size,
|
||||
off_t offset,
|
||||
std::string &errMsg) {
|
||||
OwningPtr<MemoryBuffer> buffer;
|
||||
if (error_code ec =
|
||||
MemoryBuffer::getOpenFileSlice(fd, path, buffer, map_size, offset)) {
|
||||
errMsg = ec.message();
|
||||
return NULL;
|
||||
}
|
||||
return makeLTOModule(buffer.take(), errMsg);
|
||||
}
|
||||
|
||||
LTOModule *LTOModule::makeLTOModule(const void *mem, size_t length,
|
||||
std::string &errMsg) {
|
||||
OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length));
|
||||
if (!buffer)
|
||||
return NULL;
|
||||
return makeLTOModule(buffer.take(), errMsg);
|
||||
}
|
||||
|
||||
void LTOModule::getTargetOptions(TargetOptions &Options) {
|
||||
Options.LessPreciseFPMADOption = EnableFPMAD;
|
||||
Options.NoFramePointerElim = DisableFPElim;
|
||||
Options.AllowFPOpFusion = FuseFPOps;
|
||||
Options.UnsafeFPMath = EnableUnsafeFPMath;
|
||||
Options.NoInfsFPMath = EnableNoInfsFPMath;
|
||||
Options.NoNaNsFPMath = EnableNoNaNsFPMath;
|
||||
Options.HonorSignDependentRoundingFPMathOption =
|
||||
EnableHonorSignDependentRoundingFPMath;
|
||||
Options.UseSoftFloat = GenerateSoftFloatCalls;
|
||||
if (FloatABIForCalls != FloatABI::Default)
|
||||
Options.FloatABIType = FloatABIForCalls;
|
||||
Options.NoZerosInBSS = DontPlaceZerosInBSS;
|
||||
Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
|
||||
Options.DisableTailCalls = DisableTailCalls;
|
||||
Options.StackAlignmentOverride = OverrideStackAlignment;
|
||||
Options.TrapFuncName = TrapFuncName;
|
||||
Options.PositionIndependentExecutable = EnablePIE;
|
||||
Options.EnableSegmentedStacks = SegmentedStacks;
|
||||
Options.UseInitArray = UseInitArray;
|
||||
}
|
||||
|
||||
LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer,
|
||||
std::string &errMsg) {
|
||||
// parse bitcode buffer
|
||||
OwningPtr<Module> m(getLazyBitcodeModule(buffer, getGlobalContext(),
|
||||
&errMsg));
|
||||
if (!m) {
|
||||
delete buffer;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
std::string TripleStr = m->getTargetTriple();
|
||||
if (TripleStr.empty())
|
||||
TripleStr = sys::getDefaultTargetTriple();
|
||||
llvm::Triple Triple(TripleStr);
|
||||
|
||||
// find machine architecture for this module
|
||||
const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
|
||||
if (!march)
|
||||
return NULL;
|
||||
|
||||
// construct LTOModule, hand over ownership of module and target
|
||||
SubtargetFeatures Features;
|
||||
Features.getDefaultSubtargetFeatures(Triple);
|
||||
std::string FeatureStr = Features.getString();
|
||||
// Set a default CPU for Darwin triples.
|
||||
std::string CPU;
|
||||
if (Triple.isOSDarwin()) {
|
||||
if (Triple.getArch() == llvm::Triple::x86_64)
|
||||
CPU = "core2";
|
||||
else if (Triple.getArch() == llvm::Triple::x86)
|
||||
CPU = "yonah";
|
||||
}
|
||||
TargetOptions Options;
|
||||
getTargetOptions(Options);
|
||||
TargetMachine *target = march->createTargetMachine(TripleStr, CPU, FeatureStr,
|
||||
Options);
|
||||
LTOModule *Ret = new LTOModule(m.take(), target);
|
||||
if (Ret->parseSymbols(errMsg)) {
|
||||
delete Ret;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return Ret;
|
||||
}
|
||||
|
||||
/// makeBuffer - Create a MemoryBuffer from a memory range.
|
||||
MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length) {
|
||||
const char *startPtr = (const char*)mem;
|
||||
return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), "", false);
|
||||
}
|
||||
|
||||
/// objcClassNameFromExpression - Get string that the data pointer points to.
|
||||
bool
|
||||
LTOModule::objcClassNameFromExpression(const Constant *c, std::string &name) {
|
||||
if (const ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) {
|
||||
Constant *op = ce->getOperand(0);
|
||||
if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) {
|
||||
Constant *cn = gvn->getInitializer();
|
||||
if (ConstantDataArray *ca = dyn_cast<ConstantDataArray>(cn)) {
|
||||
if (ca->isCString()) {
|
||||
name = ".objc_class_name_" + ca->getAsCString().str();
|
||||
return true;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/// addObjCClass - Parse i386/ppc ObjC class data structure.
|
||||
void LTOModule::addObjCClass(const GlobalVariable *clgv) {
|
||||
const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
|
||||
if (!c) return;
|
||||
|
||||
// second slot in __OBJC,__class is pointer to superclass name
|
||||
std::string superclassName;
|
||||
if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
|
||||
NameAndAttributes info;
|
||||
StringMap<NameAndAttributes>::value_type &entry =
|
||||
_undefines.GetOrCreateValue(superclassName);
|
||||
if (!entry.getValue().name) {
|
||||
const char *symbolName = entry.getKey().data();
|
||||
info.name = symbolName;
|
||||
info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
|
||||
info.isFunction = false;
|
||||
info.symbol = clgv;
|
||||
entry.setValue(info);
|
||||
}
|
||||
}
|
||||
|
||||
// third slot in __OBJC,__class is pointer to class name
|
||||
std::string className;
|
||||
if (objcClassNameFromExpression(c->getOperand(2), className)) {
|
||||
StringSet::value_type &entry = _defines.GetOrCreateValue(className);
|
||||
entry.setValue(1);
|
||||
|
||||
NameAndAttributes info;
|
||||
info.name = entry.getKey().data();
|
||||
info.attributes = LTO_SYMBOL_PERMISSIONS_DATA |
|
||||
LTO_SYMBOL_DEFINITION_REGULAR | LTO_SYMBOL_SCOPE_DEFAULT;
|
||||
info.isFunction = false;
|
||||
info.symbol = clgv;
|
||||
_symbols.push_back(info);
|
||||
}
|
||||
}
|
||||
|
||||
/// addObjCCategory - Parse i386/ppc ObjC category data structure.
|
||||
void LTOModule::addObjCCategory(const GlobalVariable *clgv) {
|
||||
const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
|
||||
if (!c) return;
|
||||
|
||||
// second slot in __OBJC,__category is pointer to target class name
|
||||
std::string targetclassName;
|
||||
if (!objcClassNameFromExpression(c->getOperand(1), targetclassName))
|
||||
return;
|
||||
|
||||
NameAndAttributes info;
|
||||
StringMap<NameAndAttributes>::value_type &entry =
|
||||
_undefines.GetOrCreateValue(targetclassName);
|
||||
|
||||
if (entry.getValue().name)
|
||||
return;
|
||||
|
||||
const char *symbolName = entry.getKey().data();
|
||||
info.name = symbolName;
|
||||
info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
|
||||
info.isFunction = false;
|
||||
info.symbol = clgv;
|
||||
entry.setValue(info);
|
||||
}
|
||||
|
||||
/// addObjCClassRef - Parse i386/ppc ObjC class list data structure.
|
||||
void LTOModule::addObjCClassRef(const GlobalVariable *clgv) {
|
||||
std::string targetclassName;
|
||||
if (!objcClassNameFromExpression(clgv->getInitializer(), targetclassName))
|
||||
return;
|
||||
|
||||
NameAndAttributes info;
|
||||
StringMap<NameAndAttributes>::value_type &entry =
|
||||
_undefines.GetOrCreateValue(targetclassName);
|
||||
if (entry.getValue().name)
|
||||
return;
|
||||
|
||||
const char *symbolName = entry.getKey().data();
|
||||
info.name = symbolName;
|
||||
info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
|
||||
info.isFunction = false;
|
||||
info.symbol = clgv;
|
||||
entry.setValue(info);
|
||||
}
|
||||
|
||||
/// addDefinedDataSymbol - Add a data symbol as defined to the list.
|
||||
void LTOModule::addDefinedDataSymbol(const GlobalValue *v) {
|
||||
// Add to list of defined symbols.
|
||||
addDefinedSymbol(v, false);
|
||||
|
||||
if (!v->hasSection() /* || !isTargetDarwin */)
|
||||
return;
|
||||
|
||||
// Special case i386/ppc ObjC data structures in magic sections:
|
||||
// The issue is that the old ObjC object format did some strange
|
||||
// contortions to avoid real linker symbols. For instance, the
|
||||
// ObjC class data structure is allocated statically in the executable
|
||||
// that defines that class. That data structures contains a pointer to
|
||||
// its superclass. But instead of just initializing that part of the
|
||||
// struct to the address of its superclass, and letting the static and
|
||||
// dynamic linkers do the rest, the runtime works by having that field
|
||||
// instead point to a C-string that is the name of the superclass.
|
||||
// At runtime the objc initialization updates that pointer and sets
|
||||
// it to point to the actual super class. As far as the linker
|
||||
// knows it is just a pointer to a string. But then someone wanted the
|
||||
// linker to issue errors at build time if the superclass was not found.
|
||||
// So they figured out a way in mach-o object format to use an absolute
|
||||
// symbols (.objc_class_name_Foo = 0) and a floating reference
|
||||
// (.reference .objc_class_name_Bar) to cause the linker into erroring when
|
||||
// a class was missing.
|
||||
// The following synthesizes the implicit .objc_* symbols for the linker
|
||||
// from the ObjC data structures generated by the front end.
|
||||
|
||||
// special case if this data blob is an ObjC class definition
|
||||
if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) {
|
||||
if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
|
||||
addObjCClass(gv);
|
||||
}
|
||||
}
|
||||
|
||||
// special case if this data blob is an ObjC category definition
|
||||
else if (v->getSection().compare(0, 18, "__OBJC,__category,") == 0) {
|
||||
if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
|
||||
addObjCCategory(gv);
|
||||
}
|
||||
}
|
||||
|
||||
// special case if this data blob is the list of referenced classes
|
||||
else if (v->getSection().compare(0, 18, "__OBJC,__cls_refs,") == 0) {
|
||||
if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
|
||||
addObjCClassRef(gv);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// addDefinedFunctionSymbol - Add a function symbol as defined to the list.
|
||||
void LTOModule::addDefinedFunctionSymbol(const Function *f) {
|
||||
// add to list of defined symbols
|
||||
addDefinedSymbol(f, true);
|
||||
}
|
||||
|
||||
/// addDefinedSymbol - Add a defined symbol to the list.
|
||||
void LTOModule::addDefinedSymbol(const GlobalValue *def, bool isFunction) {
|
||||
// ignore all llvm.* symbols
|
||||
if (def->getName().startswith("llvm."))
|
||||
return;
|
||||
|
||||
// string is owned by _defines
|
||||
SmallString<64> Buffer;
|
||||
_mangler.getNameWithPrefix(Buffer, def, false);
|
||||
|
||||
// set alignment part log2() can have rounding errors
|
||||
uint32_t align = def->getAlignment();
|
||||
uint32_t attr = align ? countTrailingZeros(def->getAlignment()) : 0;
|
||||
|
||||
// set permissions part
|
||||
if (isFunction) {
|
||||
attr |= LTO_SYMBOL_PERMISSIONS_CODE;
|
||||
} else {
|
||||
const GlobalVariable *gv = dyn_cast<GlobalVariable>(def);
|
||||
if (gv && gv->isConstant())
|
||||
attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
|
||||
else
|
||||
attr |= LTO_SYMBOL_PERMISSIONS_DATA;
|
||||
}
|
||||
|
||||
// set definition part
|
||||
if (def->hasWeakLinkage() || def->hasLinkOnceLinkage() ||
|
||||
def->hasLinkerPrivateWeakLinkage())
|
||||
attr |= LTO_SYMBOL_DEFINITION_WEAK;
|
||||
else if (def->hasCommonLinkage())
|
||||
attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
|
||||
else
|
||||
attr |= LTO_SYMBOL_DEFINITION_REGULAR;
|
||||
|
||||
// set scope part
|
||||
if (def->hasHiddenVisibility())
|
||||
attr |= LTO_SYMBOL_SCOPE_HIDDEN;
|
||||
else if (def->hasProtectedVisibility())
|
||||
attr |= LTO_SYMBOL_SCOPE_PROTECTED;
|
||||
else if (def->hasExternalLinkage() || def->hasWeakLinkage() ||
|
||||
def->hasLinkOnceLinkage() || def->hasCommonLinkage() ||
|
||||
def->hasLinkerPrivateWeakLinkage())
|
||||
attr |= LTO_SYMBOL_SCOPE_DEFAULT;
|
||||
else if (def->hasLinkOnceODRAutoHideLinkage())
|
||||
attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
|
||||
else
|
||||
attr |= LTO_SYMBOL_SCOPE_INTERNAL;
|
||||
|
||||
StringSet::value_type &entry = _defines.GetOrCreateValue(Buffer);
|
||||
entry.setValue(1);
|
||||
|
||||
// fill information structure
|
||||
NameAndAttributes info;
|
||||
StringRef Name = entry.getKey();
|
||||
info.name = Name.data();
|
||||
assert(info.name[Name.size()] == '\0');
|
||||
info.attributes = attr;
|
||||
info.isFunction = isFunction;
|
||||
info.symbol = def;
|
||||
|
||||
// add to table of symbols
|
||||
_symbols.push_back(info);
|
||||
}
|
||||
|
||||
/// addAsmGlobalSymbol - Add a global symbol from module-level ASM to the
|
||||
/// defined list.
|
||||
void LTOModule::addAsmGlobalSymbol(const char *name,
|
||||
lto_symbol_attributes scope) {
|
||||
StringSet::value_type &entry = _defines.GetOrCreateValue(name);
|
||||
|
||||
// only add new define if not already defined
|
||||
if (entry.getValue())
|
||||
return;
|
||||
|
||||
entry.setValue(1);
|
||||
|
||||
NameAndAttributes &info = _undefines[entry.getKey().data()];
|
||||
|
||||
if (info.symbol == 0) {
|
||||
// FIXME: This is trying to take care of module ASM like this:
|
||||
//
|
||||
// module asm ".zerofill __FOO, __foo, _bar_baz_qux, 0"
|
||||
//
|
||||
// but is gross and its mother dresses it funny. Have the ASM parser give us
|
||||
// more details for this type of situation so that we're not guessing so
|
||||
// much.
|
||||
|
||||
// fill information structure
|
||||
info.name = entry.getKey().data();
|
||||
info.attributes =
|
||||
LTO_SYMBOL_PERMISSIONS_DATA | LTO_SYMBOL_DEFINITION_REGULAR | scope;
|
||||
info.isFunction = false;
|
||||
info.symbol = 0;
|
||||
|
||||
// add to table of symbols
|
||||
_symbols.push_back(info);
|
||||
return;
|
||||
}
|
||||
|
||||
if (info.isFunction)
|
||||
addDefinedFunctionSymbol(cast<Function>(info.symbol));
|
||||
else
|
||||
addDefinedDataSymbol(info.symbol);
|
||||
|
||||
_symbols.back().attributes &= ~LTO_SYMBOL_SCOPE_MASK;
|
||||
_symbols.back().attributes |= scope;
|
||||
}
|
||||
|
||||
/// addAsmGlobalSymbolUndef - Add a global symbol from module-level ASM to the
|
||||
/// undefined list.
|
||||
void LTOModule::addAsmGlobalSymbolUndef(const char *name) {
|
||||
StringMap<NameAndAttributes>::value_type &entry =
|
||||
_undefines.GetOrCreateValue(name);
|
||||
|
||||
_asm_undefines.push_back(entry.getKey().data());
|
||||
|
||||
// we already have the symbol
|
||||
if (entry.getValue().name)
|
||||
return;
|
||||
|
||||
uint32_t attr = LTO_SYMBOL_DEFINITION_UNDEFINED;;
|
||||
attr |= LTO_SYMBOL_SCOPE_DEFAULT;
|
||||
NameAndAttributes info;
|
||||
info.name = entry.getKey().data();
|
||||
info.attributes = attr;
|
||||
info.isFunction = false;
|
||||
info.symbol = 0;
|
||||
|
||||
entry.setValue(info);
|
||||
}
|
||||
|
||||
/// addPotentialUndefinedSymbol - Add a symbol which isn't defined just yet to a
|
||||
/// list to be resolved later.
|
||||
void
|
||||
LTOModule::addPotentialUndefinedSymbol(const GlobalValue *decl, bool isFunc) {
|
||||
// ignore all llvm.* symbols
|
||||
if (decl->getName().startswith("llvm."))
|
||||
return;
|
||||
|
||||
// ignore all aliases
|
||||
if (isa<GlobalAlias>(decl))
|
||||
return;
|
||||
|
||||
SmallString<64> name;
|
||||
_mangler.getNameWithPrefix(name, decl, false);
|
||||
|
||||
StringMap<NameAndAttributes>::value_type &entry =
|
||||
_undefines.GetOrCreateValue(name);
|
||||
|
||||
// we already have the symbol
|
||||
if (entry.getValue().name)
|
||||
return;
|
||||
|
||||
NameAndAttributes info;
|
||||
|
||||
info.name = entry.getKey().data();
|
||||
|
||||
if (decl->hasExternalWeakLinkage())
|
||||
info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
|
||||
else
|
||||
info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
|
||||
|
||||
info.isFunction = isFunc;
|
||||
info.symbol = decl;
|
||||
|
||||
entry.setValue(info);
|
||||
}
|
||||
|
||||
namespace {
|
||||
class RecordStreamer : public MCStreamer {
|
||||
public:
|
||||
enum State { NeverSeen, Global, Defined, DefinedGlobal, Used };
|
||||
|
||||
private:
|
||||
StringMap<State> Symbols;
|
||||
|
||||
void markDefined(const MCSymbol &Symbol) {
|
||||
State &S = Symbols[Symbol.getName()];
|
||||
switch (S) {
|
||||
case DefinedGlobal:
|
||||
case Global:
|
||||
S = DefinedGlobal;
|
||||
break;
|
||||
case NeverSeen:
|
||||
case Defined:
|
||||
case Used:
|
||||
S = Defined;
|
||||
break;
|
||||
}
|
||||
}
|
||||
void markGlobal(const MCSymbol &Symbol) {
|
||||
State &S = Symbols[Symbol.getName()];
|
||||
switch (S) {
|
||||
case DefinedGlobal:
|
||||
case Defined:
|
||||
S = DefinedGlobal;
|
||||
break;
|
||||
|
||||
case NeverSeen:
|
||||
case Global:
|
||||
case Used:
|
||||
S = Global;
|
||||
break;
|
||||
}
|
||||
}
|
||||
void markUsed(const MCSymbol &Symbol) {
|
||||
State &S = Symbols[Symbol.getName()];
|
||||
switch (S) {
|
||||
case DefinedGlobal:
|
||||
case Defined:
|
||||
case Global:
|
||||
break;
|
||||
|
||||
case NeverSeen:
|
||||
case Used:
|
||||
S = Used;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// FIXME: mostly copied for the obj streamer.
|
||||
void AddValueSymbols(const MCExpr *Value) {
|
||||
switch (Value->getKind()) {
|
||||
case MCExpr::Target:
|
||||
// FIXME: What should we do in here?
|
||||
break;
|
||||
|
||||
case MCExpr::Constant:
|
||||
break;
|
||||
|
||||
case MCExpr::Binary: {
|
||||
const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
|
||||
AddValueSymbols(BE->getLHS());
|
||||
AddValueSymbols(BE->getRHS());
|
||||
break;
|
||||
}
|
||||
|
||||
case MCExpr::SymbolRef:
|
||||
markUsed(cast<MCSymbolRefExpr>(Value)->getSymbol());
|
||||
break;
|
||||
|
||||
case MCExpr::Unary:
|
||||
AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
public:
|
||||
typedef StringMap<State>::const_iterator const_iterator;
|
||||
|
||||
const_iterator begin() {
|
||||
return Symbols.begin();
|
||||
}
|
||||
|
||||
const_iterator end() {
|
||||
return Symbols.end();
|
||||
}
|
||||
|
||||
RecordStreamer(MCContext &Context)
|
||||
: MCStreamer(SK_RecordStreamer, Context) {}
|
||||
|
||||
virtual void EmitInstruction(const MCInst &Inst) {
|
||||
// Scan for values.
|
||||
for (unsigned i = Inst.getNumOperands(); i--; )
|
||||
if (Inst.getOperand(i).isExpr())
|
||||
AddValueSymbols(Inst.getOperand(i).getExpr());
|
||||
}
|
||||
virtual void EmitLabel(MCSymbol *Symbol) {
|
||||
Symbol->setSection(*getCurrentSection().first);
|
||||
markDefined(*Symbol);
|
||||
}
|
||||
virtual void EmitDebugLabel(MCSymbol *Symbol) {
|
||||
EmitLabel(Symbol);
|
||||
}
|
||||
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
|
||||
// FIXME: should we handle aliases?
|
||||
markDefined(*Symbol);
|
||||
}
|
||||
virtual bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) {
|
||||
if (Attribute == MCSA_Global)
|
||||
markGlobal(*Symbol);
|
||||
return true;
|
||||
}
|
||||
virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
|
||||
uint64_t Size , unsigned ByteAlignment) {
|
||||
markDefined(*Symbol);
|
||||
}
|
||||
virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
||||
unsigned ByteAlignment) {
|
||||
markDefined(*Symbol);
|
||||
}
|
||||
|
||||
virtual void EmitBundleAlignMode(unsigned AlignPow2) {}
|
||||
virtual void EmitBundleLock(bool AlignToEnd) {}
|
||||
virtual void EmitBundleUnlock() {}
|
||||
|
||||
// Noop calls.
|
||||
virtual void ChangeSection(const MCSection *Section,
|
||||
const MCExpr *Subsection) {}
|
||||
virtual void InitToTextSection() {}
|
||||
virtual void InitSections() {}
|
||||
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
|
||||
virtual void EmitThumbFunc(MCSymbol *Func) {}
|
||||
virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
|
||||
virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
|
||||
virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
|
||||
virtual void EmitCOFFSymbolStorageClass(int StorageClass) {}
|
||||
virtual void EmitCOFFSymbolType(int Type) {}
|
||||
virtual void EndCOFFSymbolDef() {}
|
||||
virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
|
||||
virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
||||
unsigned ByteAlignment) {}
|
||||
virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
|
||||
uint64_t Size, unsigned ByteAlignment) {}
|
||||
virtual void EmitBytes(StringRef Data) {}
|
||||
virtual void EmitValueImpl(const MCExpr *Value, unsigned Size) {}
|
||||
virtual void EmitULEB128Value(const MCExpr *Value) {}
|
||||
virtual void EmitSLEB128Value(const MCExpr *Value) {}
|
||||
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
|
||||
unsigned ValueSize,
|
||||
unsigned MaxBytesToEmit) {}
|
||||
virtual void EmitCodeAlignment(unsigned ByteAlignment,
|
||||
unsigned MaxBytesToEmit) {}
|
||||
virtual bool EmitValueToOffset(const MCExpr *Offset,
|
||||
unsigned char Value ) { return false; }
|
||||
virtual void EmitFileDirective(StringRef Filename) {}
|
||||
virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
|
||||
const MCSymbol *LastLabel,
|
||||
const MCSymbol *Label,
|
||||
unsigned PointerSize) {}
|
||||
virtual void FinishImpl() {}
|
||||
virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
|
||||
RecordProcEnd(Frame);
|
||||
}
|
||||
|
||||
static bool classof(const MCStreamer *S) {
|
||||
return S->getKind() == SK_RecordStreamer;
|
||||
}
|
||||
};
|
||||
} // end anonymous namespace
|
||||
|
||||
/// addAsmGlobalSymbols - Add global symbols from module-level ASM to the
|
||||
/// defined or undefined lists.
|
||||
bool LTOModule::addAsmGlobalSymbols(std::string &errMsg) {
|
||||
const std::string &inlineAsm = _module->getModuleInlineAsm();
|
||||
if (inlineAsm.empty())
|
||||
return false;
|
||||
|
||||
OwningPtr<RecordStreamer> Streamer(new RecordStreamer(_context));
|
||||
MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(inlineAsm);
|
||||
SourceMgr SrcMgr;
|
||||
SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
|
||||
OwningPtr<MCAsmParser> Parser(createMCAsmParser(SrcMgr,
|
||||
_context, *Streamer,
|
||||
*_target->getMCAsmInfo()));
|
||||
const Target &T = _target->getTarget();
|
||||
OwningPtr<MCInstrInfo> MCII(T.createMCInstrInfo());
|
||||
OwningPtr<MCSubtargetInfo>
|
||||
STI(T.createMCSubtargetInfo(_target->getTargetTriple(),
|
||||
_target->getTargetCPU(),
|
||||
_target->getTargetFeatureString()));
|
||||
OwningPtr<MCTargetAsmParser> TAP(T.createMCAsmParser(*STI, *Parser.get(), *MCII));
|
||||
if (!TAP) {
|
||||
errMsg = "target " + std::string(T.getName()) +
|
||||
" does not define AsmParser.";
|
||||
return true;
|
||||
}
|
||||
|
||||
Parser->setTargetParser(*TAP);
|
||||
if (Parser->Run(false))
|
||||
return true;
|
||||
|
||||
for (RecordStreamer::const_iterator i = Streamer->begin(),
|
||||
e = Streamer->end(); i != e; ++i) {
|
||||
StringRef Key = i->first();
|
||||
RecordStreamer::State Value = i->second;
|
||||
if (Value == RecordStreamer::DefinedGlobal)
|
||||
addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_DEFAULT);
|
||||
else if (Value == RecordStreamer::Defined)
|
||||
addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_INTERNAL);
|
||||
else if (Value == RecordStreamer::Global ||
|
||||
Value == RecordStreamer::Used)
|
||||
addAsmGlobalSymbolUndef(Key.data());
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/// isDeclaration - Return 'true' if the global value is a declaration.
|
||||
static bool isDeclaration(const GlobalValue &V) {
|
||||
if (V.hasAvailableExternallyLinkage())
|
||||
return true;
|
||||
|
||||
if (V.isMaterializable())
|
||||
return false;
|
||||
|
||||
return V.isDeclaration();
|
||||
}
|
||||
|
||||
/// parseSymbols - Parse the symbols from the module and model-level ASM and add
|
||||
/// them to either the defined or undefined lists.
|
||||
bool LTOModule::parseSymbols(std::string &errMsg) {
|
||||
// add functions
|
||||
for (Module::iterator f = _module->begin(), e = _module->end(); f != e; ++f) {
|
||||
if (isDeclaration(*f))
|
||||
addPotentialUndefinedSymbol(f, true);
|
||||
else
|
||||
addDefinedFunctionSymbol(f);
|
||||
}
|
||||
|
||||
// add data
|
||||
for (Module::global_iterator v = _module->global_begin(),
|
||||
e = _module->global_end(); v != e; ++v) {
|
||||
if (isDeclaration(*v))
|
||||
addPotentialUndefinedSymbol(v, false);
|
||||
else
|
||||
addDefinedDataSymbol(v);
|
||||
}
|
||||
|
||||
// add asm globals
|
||||
if (addAsmGlobalSymbols(errMsg))
|
||||
return true;
|
||||
|
||||
// add aliases
|
||||
for (Module::alias_iterator a = _module->alias_begin(),
|
||||
e = _module->alias_end(); a != e; ++a) {
|
||||
if (isDeclaration(*a->getAliasedGlobal()))
|
||||
// Is an alias to a declaration.
|
||||
addPotentialUndefinedSymbol(a, false);
|
||||
else
|
||||
addDefinedDataSymbol(a);
|
||||
}
|
||||
|
||||
// make symbols for all undefines
|
||||
for (StringMap<NameAndAttributes>::iterator u =_undefines.begin(),
|
||||
e = _undefines.end(); u != e; ++u) {
|
||||
// If this symbol also has a definition, then don't make an undefine because
|
||||
// it is a tentative definition.
|
||||
if (_defines.count(u->getKey())) continue;
|
||||
NameAndAttributes info = u->getValue();
|
||||
_symbols.push_back(info);
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
15
lib/LTO/Makefile
Normal file
15
lib/LTO/Makefile
Normal file
@@ -0,0 +1,15 @@
|
||||
##===- lib/Linker/Makefile ---------------------------------*- Makefile -*-===##
|
||||
#
|
||||
# The LLVM Compiler Infrastructure
|
||||
#
|
||||
# This file is distributed under the University of Illinois Open Source
|
||||
# License. See LICENSE.TXT for details.
|
||||
#
|
||||
##===----------------------------------------------------------------------===##
|
||||
|
||||
LEVEL = ../..
|
||||
LIBRARYNAME = LLVMLTO
|
||||
BUILD_ARCHIVE := 1
|
||||
|
||||
include $(LEVEL)/Makefile.common
|
||||
|
Reference in New Issue
Block a user