forked from OSchip/llvm-project
849 lines
28 KiB
C++
849 lines
28 KiB
C++
//===-- LTOModule.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/LTOModule.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Metadata.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCParser/MCAsmParser.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCTargetAsmParser.h"
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#include "llvm/MC/SubtargetFeature.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/Host.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/SourceMgr.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/system_error.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Transforms/Utils/GlobalStatus.h"
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using namespace llvm;
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LTOModule::LTOModule(llvm::Module *m, llvm::TargetMachine *t)
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: _module(m), _target(t),
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_context(_target->getMCAsmInfo(), _target->getRegisterInfo(), &ObjFileInfo),
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_mangler(t->getDataLayout()) {
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ObjFileInfo.InitMCObjectFileInfo(t->getTargetTriple(),
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t->getRelocationModel(), t->getCodeModel(),
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_context);
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}
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/// isBitcodeFile - Returns 'true' if the file (or memory contents) is LLVM
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/// bitcode.
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bool LTOModule::isBitcodeFile(const void *mem, size_t length) {
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return sys::fs::identify_magic(StringRef((const char *)mem, length)) ==
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sys::fs::file_magic::bitcode;
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}
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bool LTOModule::isBitcodeFile(const char *path) {
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sys::fs::file_magic type;
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if (sys::fs::identify_magic(path, type))
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return false;
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return type == sys::fs::file_magic::bitcode;
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}
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/// isBitcodeFileForTarget - Returns 'true' if the file (or memory contents) is
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/// LLVM bitcode for the specified triple.
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bool LTOModule::isBitcodeFileForTarget(const void *mem, size_t length,
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const char *triplePrefix) {
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MemoryBuffer *buffer = makeBuffer(mem, length);
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if (!buffer)
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return false;
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return isTargetMatch(buffer, triplePrefix);
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}
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bool LTOModule::isBitcodeFileForTarget(const char *path,
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const char *triplePrefix) {
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std::unique_ptr<MemoryBuffer> buffer;
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if (MemoryBuffer::getFile(path, buffer))
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return false;
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return isTargetMatch(buffer.release(), triplePrefix);
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}
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/// isTargetMatch - Returns 'true' if the memory buffer is for the specified
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/// target triple.
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bool LTOModule::isTargetMatch(MemoryBuffer *buffer, const char *triplePrefix) {
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std::string Triple = getBitcodeTargetTriple(buffer, getGlobalContext());
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delete buffer;
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return strncmp(Triple.c_str(), triplePrefix, strlen(triplePrefix)) == 0;
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}
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/// makeLTOModule - Create an LTOModule. N.B. These methods take ownership of
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/// the buffer.
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LTOModule *LTOModule::makeLTOModule(const char *path, TargetOptions options,
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std::string &errMsg) {
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std::unique_ptr<MemoryBuffer> buffer;
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if (error_code ec = MemoryBuffer::getFile(path, buffer)) {
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errMsg = ec.message();
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return NULL;
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}
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return makeLTOModule(buffer.release(), options, errMsg);
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}
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LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
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size_t size, TargetOptions options,
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std::string &errMsg) {
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return makeLTOModule(fd, path, size, 0, options, errMsg);
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}
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LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
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size_t map_size,
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off_t offset,
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TargetOptions options,
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std::string &errMsg) {
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std::unique_ptr<MemoryBuffer> buffer;
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if (error_code ec =
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MemoryBuffer::getOpenFileSlice(fd, path, buffer, map_size, offset)) {
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errMsg = ec.message();
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return NULL;
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}
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return makeLTOModule(buffer.release(), options, errMsg);
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}
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LTOModule *LTOModule::makeLTOModule(const void *mem, size_t length,
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TargetOptions options,
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std::string &errMsg, StringRef path) {
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std::unique_ptr<MemoryBuffer> buffer(makeBuffer(mem, length, path));
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if (!buffer)
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return NULL;
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return makeLTOModule(buffer.release(), options, errMsg);
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}
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LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer,
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TargetOptions options,
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std::string &errMsg) {
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// parse bitcode buffer
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ErrorOr<Module *> ModuleOrErr =
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getLazyBitcodeModule(buffer, getGlobalContext());
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if (error_code EC = ModuleOrErr.getError()) {
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errMsg = EC.message();
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delete buffer;
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return NULL;
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}
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std::unique_ptr<Module> m(ModuleOrErr.get());
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std::string TripleStr = m->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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// find machine architecture for this module
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const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
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if (!march)
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return NULL;
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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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std::string CPU;
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if (Triple.isOSDarwin()) {
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if (Triple.getArch() == llvm::Triple::x86_64)
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CPU = "core2";
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else if (Triple.getArch() == llvm::Triple::x86)
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CPU = "yonah";
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else if (Triple.getArch() == llvm::Triple::arm64)
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CPU = "cyclone";
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}
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TargetMachine *target = march->createTargetMachine(TripleStr, CPU, FeatureStr,
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options);
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m->materializeAllPermanently();
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LTOModule *Ret = new LTOModule(m.release(), target);
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// We need a MCContext set up in order to get mangled names of private
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// symbols. It is a bit odd that we need to report uses and definitions
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// of private symbols, but it does look like ld64 expects to be informed
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// of at least the ones with an 'l' prefix.
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MCContext &Context = Ret->_context;
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const TargetLoweringObjectFile &TLOF =
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target->getTargetLowering()->getObjFileLowering();
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const_cast<TargetLoweringObjectFile &>(TLOF).Initialize(Context, *target);
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if (Ret->parseSymbols(errMsg)) {
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delete Ret;
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return NULL;
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}
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Ret->parseMetadata();
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return Ret;
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}
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/// Create a MemoryBuffer from a memory range with an optional name.
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MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length,
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StringRef name) {
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const char *startPtr = (const char*)mem;
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return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), name, false);
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}
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/// objcClassNameFromExpression - Get string that the data pointer points to.
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bool
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LTOModule::objcClassNameFromExpression(const Constant *c, std::string &name) {
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if (const ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) {
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Constant *op = ce->getOperand(0);
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if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) {
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Constant *cn = gvn->getInitializer();
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if (ConstantDataArray *ca = dyn_cast<ConstantDataArray>(cn)) {
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if (ca->isCString()) {
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name = ".objc_class_name_" + ca->getAsCString().str();
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return true;
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}
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}
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}
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}
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return false;
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}
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/// addObjCClass - Parse i386/ppc ObjC class data structure.
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void LTOModule::addObjCClass(const GlobalVariable *clgv) {
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const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
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if (!c) return;
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// second slot in __OBJC,__class is pointer to superclass name
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std::string superclassName;
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if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
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NameAndAttributes info;
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StringMap<NameAndAttributes>::value_type &entry =
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_undefines.GetOrCreateValue(superclassName);
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if (!entry.getValue().name) {
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const char *symbolName = entry.getKey().data();
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info.name = symbolName;
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info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
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info.isFunction = false;
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info.symbol = clgv;
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entry.setValue(info);
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}
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}
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// third slot in __OBJC,__class is pointer to class name
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std::string className;
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if (objcClassNameFromExpression(c->getOperand(2), className)) {
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StringSet::value_type &entry = _defines.GetOrCreateValue(className);
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entry.setValue(1);
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NameAndAttributes info;
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info.name = entry.getKey().data();
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info.attributes = LTO_SYMBOL_PERMISSIONS_DATA |
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LTO_SYMBOL_DEFINITION_REGULAR | LTO_SYMBOL_SCOPE_DEFAULT;
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info.isFunction = false;
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info.symbol = clgv;
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_symbols.push_back(info);
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}
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}
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/// addObjCCategory - Parse i386/ppc ObjC category data structure.
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void LTOModule::addObjCCategory(const GlobalVariable *clgv) {
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const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
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if (!c) return;
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// second slot in __OBJC,__category is pointer to target class name
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std::string targetclassName;
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if (!objcClassNameFromExpression(c->getOperand(1), targetclassName))
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return;
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NameAndAttributes info;
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StringMap<NameAndAttributes>::value_type &entry =
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_undefines.GetOrCreateValue(targetclassName);
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if (entry.getValue().name)
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return;
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const char *symbolName = entry.getKey().data();
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info.name = symbolName;
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info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
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info.isFunction = false;
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info.symbol = clgv;
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entry.setValue(info);
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}
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/// addObjCClassRef - Parse i386/ppc ObjC class list data structure.
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void LTOModule::addObjCClassRef(const GlobalVariable *clgv) {
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std::string targetclassName;
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if (!objcClassNameFromExpression(clgv->getInitializer(), targetclassName))
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return;
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NameAndAttributes info;
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StringMap<NameAndAttributes>::value_type &entry =
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_undefines.GetOrCreateValue(targetclassName);
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if (entry.getValue().name)
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return;
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const char *symbolName = entry.getKey().data();
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info.name = symbolName;
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info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
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info.isFunction = false;
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info.symbol = clgv;
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entry.setValue(info);
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}
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/// addDefinedDataSymbol - Add a data symbol as defined to the list.
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void LTOModule::addDefinedDataSymbol(const GlobalValue *v) {
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// Add to list of defined symbols.
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addDefinedSymbol(v, false);
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if (!v->hasSection() /* || !isTargetDarwin */)
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return;
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// Special case i386/ppc ObjC data structures in magic sections:
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// The issue is that the old ObjC object format did some strange
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// contortions to avoid real linker symbols. For instance, the
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// ObjC class data structure is allocated statically in the executable
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// that defines that class. That data structures contains a pointer to
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// its superclass. But instead of just initializing that part of the
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// struct to the address of its superclass, and letting the static and
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// dynamic linkers do the rest, the runtime works by having that field
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// instead point to a C-string that is the name of the superclass.
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// At runtime the objc initialization updates that pointer and sets
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// it to point to the actual super class. As far as the linker
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// knows it is just a pointer to a string. But then someone wanted the
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// linker to issue errors at build time if the superclass was not found.
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// So they figured out a way in mach-o object format to use an absolute
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// symbols (.objc_class_name_Foo = 0) and a floating reference
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// (.reference .objc_class_name_Bar) to cause the linker into erroring when
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// a class was missing.
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// The following synthesizes the implicit .objc_* symbols for the linker
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// from the ObjC data structures generated by the front end.
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// special case if this data blob is an ObjC class definition
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if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) {
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if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
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addObjCClass(gv);
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}
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}
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// special case if this data blob is an ObjC category definition
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else if (v->getSection().compare(0, 18, "__OBJC,__category,") == 0) {
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if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
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addObjCCategory(gv);
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}
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}
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// special case if this data blob is the list of referenced classes
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else if (v->getSection().compare(0, 18, "__OBJC,__cls_refs,") == 0) {
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if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
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addObjCClassRef(gv);
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}
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}
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}
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/// addDefinedFunctionSymbol - Add a function symbol as defined to the list.
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void LTOModule::addDefinedFunctionSymbol(const Function *f) {
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// add to list of defined symbols
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addDefinedSymbol(f, true);
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}
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static bool canBeHidden(const GlobalValue *GV) {
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// FIXME: this is duplicated with another static function in AsmPrinter.cpp
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GlobalValue::LinkageTypes L = GV->getLinkage();
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if (L != GlobalValue::LinkOnceODRLinkage)
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return false;
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if (GV->hasUnnamedAddr())
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return true;
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// If it is a non constant variable, it needs to be uniqued across shared
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// objects.
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if (const GlobalVariable *Var = dyn_cast<GlobalVariable>(GV)) {
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if (!Var->isConstant())
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return false;
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}
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GlobalStatus GS;
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if (GlobalStatus::analyzeGlobal(GV, GS))
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return false;
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return !GS.IsCompared;
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}
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/// addDefinedSymbol - Add a defined symbol to the list.
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void LTOModule::addDefinedSymbol(const GlobalValue *def, bool isFunction) {
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// ignore all llvm.* symbols
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if (def->getName().startswith("llvm."))
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return;
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// string is owned by _defines
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SmallString<64> Buffer;
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_target->getNameWithPrefix(Buffer, def, _mangler);
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// set alignment part log2() can have rounding errors
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uint32_t align = def->getAlignment();
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uint32_t attr = align ? countTrailingZeros(def->getAlignment()) : 0;
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// set permissions part
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if (isFunction) {
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attr |= LTO_SYMBOL_PERMISSIONS_CODE;
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} else {
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const GlobalVariable *gv = dyn_cast<GlobalVariable>(def);
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if (gv && gv->isConstant())
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attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
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else
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attr |= LTO_SYMBOL_PERMISSIONS_DATA;
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}
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// set definition part
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if (def->hasWeakLinkage() || def->hasLinkOnceLinkage())
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attr |= LTO_SYMBOL_DEFINITION_WEAK;
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else if (def->hasCommonLinkage())
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attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
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else
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attr |= LTO_SYMBOL_DEFINITION_REGULAR;
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// set scope part
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if (def->hasHiddenVisibility())
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attr |= LTO_SYMBOL_SCOPE_HIDDEN;
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else if (def->hasProtectedVisibility())
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attr |= LTO_SYMBOL_SCOPE_PROTECTED;
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else if (canBeHidden(def))
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attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
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else if (def->hasExternalLinkage() || def->hasWeakLinkage() ||
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def->hasLinkOnceLinkage() || def->hasCommonLinkage())
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attr |= LTO_SYMBOL_SCOPE_DEFAULT;
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else
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attr |= LTO_SYMBOL_SCOPE_INTERNAL;
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StringSet::value_type &entry = _defines.GetOrCreateValue(Buffer);
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entry.setValue(1);
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// fill information structure
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NameAndAttributes info;
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StringRef Name = entry.getKey();
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info.name = Name.data();
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assert(info.name[Name.size()] == '\0');
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info.attributes = attr;
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info.isFunction = isFunction;
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info.symbol = def;
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// add to table of symbols
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_symbols.push_back(info);
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}
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/// addAsmGlobalSymbol - Add a global symbol from module-level ASM to the
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/// defined list.
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void LTOModule::addAsmGlobalSymbol(const char *name,
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lto_symbol_attributes scope) {
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StringSet::value_type &entry = _defines.GetOrCreateValue(name);
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// only add new define if not already defined
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if (entry.getValue())
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return;
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entry.setValue(1);
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NameAndAttributes &info = _undefines[entry.getKey().data()];
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if (info.symbol == 0) {
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// FIXME: This is trying to take care of module ASM like this:
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//
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// module asm ".zerofill __FOO, __foo, _bar_baz_qux, 0"
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//
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// but is gross and its mother dresses it funny. Have the ASM parser give us
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// more details for this type of situation so that we're not guessing so
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// much.
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// fill information structure
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info.name = entry.getKey().data();
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info.attributes =
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LTO_SYMBOL_PERMISSIONS_DATA | LTO_SYMBOL_DEFINITION_REGULAR | scope;
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info.isFunction = false;
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info.symbol = 0;
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// add to table of symbols
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_symbols.push_back(info);
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return;
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}
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|
|
|
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;
|
|
_target->getNameWithPrefix(name, decl, _mangler);
|
|
|
|
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(Context) {}
|
|
|
|
void EmitInstruction(const MCInst &Inst,
|
|
const MCSubtargetInfo &STI) override {
|
|
// Scan for values.
|
|
for (unsigned i = Inst.getNumOperands(); i--; )
|
|
if (Inst.getOperand(i).isExpr())
|
|
AddValueSymbols(Inst.getOperand(i).getExpr());
|
|
}
|
|
void EmitLabel(MCSymbol *Symbol) override {
|
|
Symbol->setSection(*getCurrentSection().first);
|
|
markDefined(*Symbol);
|
|
}
|
|
void EmitDebugLabel(MCSymbol *Symbol) override {
|
|
EmitLabel(Symbol);
|
|
}
|
|
void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override {
|
|
// FIXME: should we handle aliases?
|
|
markDefined(*Symbol);
|
|
AddValueSymbols(Value);
|
|
}
|
|
bool EmitSymbolAttribute(MCSymbol *Symbol,
|
|
MCSymbolAttr Attribute) override {
|
|
if (Attribute == MCSA_Global)
|
|
markGlobal(*Symbol);
|
|
return true;
|
|
}
|
|
void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size , unsigned ByteAlignment) override {
|
|
markDefined(*Symbol);
|
|
}
|
|
void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) override {
|
|
markDefined(*Symbol);
|
|
}
|
|
|
|
void EmitBundleAlignMode(unsigned AlignPow2) override {}
|
|
void EmitBundleLock(bool AlignToEnd) override {}
|
|
void EmitBundleUnlock() override {}
|
|
|
|
// Noop calls.
|
|
void ChangeSection(const MCSection *Section,
|
|
const MCExpr *Subsection) override {}
|
|
void EmitAssemblerFlag(MCAssemblerFlag Flag) override {}
|
|
void EmitThumbFunc(MCSymbol *Func) override {}
|
|
void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override {}
|
|
void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override {}
|
|
void BeginCOFFSymbolDef(const MCSymbol *Symbol) override {}
|
|
void EmitCOFFSymbolStorageClass(int StorageClass) override {}
|
|
void EmitCOFFSymbolType(int Type) override {}
|
|
void EndCOFFSymbolDef() override {}
|
|
void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override {}
|
|
void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) override {}
|
|
void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) override {}
|
|
void EmitBytes(StringRef Data) override {}
|
|
void EmitValueImpl(const MCExpr *Value, unsigned Size) override {}
|
|
void EmitULEB128Value(const MCExpr *Value) override {}
|
|
void EmitSLEB128Value(const MCExpr *Value) override {}
|
|
void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
|
|
unsigned ValueSize,
|
|
unsigned MaxBytesToEmit) override {}
|
|
void EmitCodeAlignment(unsigned ByteAlignment,
|
|
unsigned MaxBytesToEmit) override {}
|
|
bool EmitValueToOffset(const MCExpr *Offset,
|
|
unsigned char Value) override { return false; }
|
|
void EmitFileDirective(StringRef Filename) override {}
|
|
void EmitDwarfAdvanceLineAddr(int64_t LineDelta, const MCSymbol *LastLabel,
|
|
const MCSymbol *Label,
|
|
unsigned PointerSize) override {}
|
|
void FinishImpl() override {}
|
|
void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override {
|
|
RecordProcEnd(Frame);
|
|
}
|
|
};
|
|
} // 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;
|
|
|
|
std::unique_ptr<RecordStreamer> Streamer(new RecordStreamer(_context));
|
|
MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(inlineAsm);
|
|
SourceMgr SrcMgr;
|
|
SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
|
|
std::unique_ptr<MCAsmParser> Parser(
|
|
createMCAsmParser(SrcMgr, _context, *Streamer, *_target->getMCAsmInfo()));
|
|
const Target &T = _target->getTarget();
|
|
std::unique_ptr<MCInstrInfo> MCII(T.createMCInstrInfo());
|
|
std::unique_ptr<MCSubtargetInfo> STI(T.createMCSubtargetInfo(
|
|
_target->getTargetTriple(), _target->getTargetCPU(),
|
|
_target->getTargetFeatureString()));
|
|
std::unique_ptr<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;
|
|
}
|
|
|
|
/// parseMetadata - Parse metadata from the module
|
|
void LTOModule::parseMetadata() {
|
|
// Linker Options
|
|
if (Value *Val = _module->getModuleFlag("Linker Options")) {
|
|
MDNode *LinkerOptions = cast<MDNode>(Val);
|
|
for (unsigned i = 0, e = LinkerOptions->getNumOperands(); i != e; ++i) {
|
|
MDNode *MDOptions = cast<MDNode>(LinkerOptions->getOperand(i));
|
|
for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) {
|
|
MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii));
|
|
StringRef Op = _linkeropt_strings.
|
|
GetOrCreateValue(MDOption->getString()).getKey();
|
|
StringRef DepLibName = _target->getTargetLowering()->
|
|
getObjFileLowering().getDepLibFromLinkerOpt(Op);
|
|
if (!DepLibName.empty())
|
|
_deplibs.push_back(DepLibName.data());
|
|
else if (!Op.empty())
|
|
_linkeropts.push_back(Op.data());
|
|
}
|
|
}
|
|
}
|
|
|
|
// Add other interesting metadata here.
|
|
}
|