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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216068 91177308-0d34-0410-b5e6-96231b3b80d8
601 lines
20 KiB
C++
601 lines
20 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/CodeGen/Analysis.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/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/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/Target/TargetSubtargetInfo.h"
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#include "llvm/Transforms/Utils/GlobalStatus.h"
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#include <system_error>
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using namespace llvm;
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LTOModule::LTOModule(std::unique_ptr<object::IRObjectFile> Obj,
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llvm::TargetMachine *TM)
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: IRFile(std::move(Obj)), _target(TM) {}
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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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bool LTOModule::isBitcodeForTarget(MemoryBuffer *buffer,
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StringRef triplePrefix) {
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std::string Triple = getBitcodeTargetTriple(buffer, getGlobalContext());
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return StringRef(Triple).startswith(triplePrefix);
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}
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LTOModule *LTOModule::createFromFile(const char *path, TargetOptions options,
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std::string &errMsg) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
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MemoryBuffer::getFile(path);
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if (std::error_code EC = BufferOrErr.getError()) {
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errMsg = EC.message();
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return nullptr;
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}
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std::unique_ptr<MemoryBuffer> Buffer = std::move(BufferOrErr.get());
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return makeLTOModule(Buffer->getMemBufferRef(), options, errMsg);
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}
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LTOModule *LTOModule::createFromOpenFile(int fd, const char *path, size_t size,
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TargetOptions options,
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std::string &errMsg) {
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return createFromOpenFileSlice(fd, path, size, 0, options, errMsg);
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}
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LTOModule *LTOModule::createFromOpenFileSlice(int fd, const char *path,
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size_t map_size, off_t offset,
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TargetOptions options,
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std::string &errMsg) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
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MemoryBuffer::getOpenFileSlice(fd, path, map_size, offset);
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if (std::error_code EC = BufferOrErr.getError()) {
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errMsg = EC.message();
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return nullptr;
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}
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std::unique_ptr<MemoryBuffer> Buffer = std::move(BufferOrErr.get());
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return makeLTOModule(Buffer->getMemBufferRef(), options, errMsg);
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}
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LTOModule *LTOModule::createFromBuffer(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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StringRef Data((const char *)mem, length);
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MemoryBufferRef Buffer(Data, path);
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return makeLTOModule(Buffer, options, errMsg);
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}
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LTOModule *LTOModule::makeLTOModule(MemoryBufferRef Buffer,
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TargetOptions options,
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std::string &errMsg) {
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StringRef Data = Buffer.getBuffer();
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StringRef FileName = Buffer.getBufferIdentifier();
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std::unique_ptr<MemoryBuffer> MemBuf(
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makeBuffer(Data.begin(), Data.size(), FileName));
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if (!MemBuf)
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return nullptr;
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ErrorOr<Module *> MOrErr =
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getLazyBitcodeModule(MemBuf.get(), getGlobalContext());
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if (std::error_code EC = MOrErr.getError()) {
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errMsg = EC.message();
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return nullptr;
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}
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std::unique_ptr<Module> M(MOrErr.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 nullptr;
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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::aarch64)
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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(true);
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M->setDataLayout(target->getSubtargetImpl()->getDataLayout());
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std::unique_ptr<object::IRObjectFile> IRObj(
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new object::IRObjectFile(Buffer, std::move(M)));
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LTOModule *Ret = new LTOModule(std::move(IRObj), target);
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if (Ret->parseSymbols(errMsg)) {
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delete Ret;
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return nullptr;
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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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std::unique_ptr<MemoryBuffer>
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LTOModule::makeBuffer(const void *mem, size_t length, StringRef name) {
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const char *startPtr = (const char*)mem;
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return std::unique_ptr<MemoryBuffer>(
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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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void LTOModule::addDefinedDataSymbol(const object::BasicSymbolRef &Sym) {
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SmallString<64> Buffer;
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{
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raw_svector_ostream OS(Buffer);
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Sym.printName(OS);
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}
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const GlobalValue *V = IRFile->getSymbolGV(Sym.getRawDataRefImpl());
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addDefinedDataSymbol(Buffer.c_str(), V);
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}
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void LTOModule::addDefinedDataSymbol(const char *Name, const GlobalValue *v) {
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// Add to list of defined symbols.
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addDefinedSymbol(Name, 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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std::string Section = v->getSection();
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if (Section.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 (Section.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 (Section.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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void LTOModule::addDefinedFunctionSymbol(const object::BasicSymbolRef &Sym) {
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SmallString<64> Buffer;
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{
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raw_svector_ostream OS(Buffer);
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Sym.printName(OS);
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}
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const Function *F =
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cast<Function>(IRFile->getSymbolGV(Sym.getRawDataRefImpl()));
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addDefinedFunctionSymbol(Buffer.c_str(), F);
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}
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void LTOModule::addDefinedFunctionSymbol(const char *Name, const Function *F) {
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// add to list of defined symbols
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addDefinedSymbol(Name, F, true);
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}
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void LTOModule::addDefinedSymbol(const char *Name, const GlobalValue *def,
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bool isFunction) {
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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(align) : 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->hasLocalLinkage())
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// Ignore visibility if linkage is local.
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attr |= LTO_SYMBOL_SCOPE_INTERNAL;
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else 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 (canBeOmittedFromSymbolTable(def))
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attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
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else
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attr |= LTO_SYMBOL_SCOPE_DEFAULT;
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StringSet::value_type &entry = _defines.GetOrCreateValue(Name);
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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 NameRef = entry.getKey();
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info.name = NameRef.data();
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assert(info.name[NameRef.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 == nullptr) {
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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 = nullptr;
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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)
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addDefinedFunctionSymbol(info.name, cast<Function>(info.symbol));
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else
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addDefinedDataSymbol(info.name, info.symbol);
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_symbols.back().attributes &= ~LTO_SYMBOL_SCOPE_MASK;
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_symbols.back().attributes |= scope;
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}
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/// addAsmGlobalSymbolUndef - Add a global symbol from module-level ASM to the
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/// undefined list.
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void LTOModule::addAsmGlobalSymbolUndef(const char *name) {
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StringMap<NameAndAttributes>::value_type &entry =
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_undefines.GetOrCreateValue(name);
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_asm_undefines.push_back(entry.getKey().data());
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// we already have the symbol
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if (entry.getValue().name)
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return;
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uint32_t attr = LTO_SYMBOL_DEFINITION_UNDEFINED;
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attr |= LTO_SYMBOL_SCOPE_DEFAULT;
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NameAndAttributes info;
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info.name = entry.getKey().data();
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info.attributes = attr;
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info.isFunction = false;
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info.symbol = nullptr;
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|
entry.setValue(info);
|
|
}
|
|
|
|
/// Add a symbol which isn't defined just yet to a list to be resolved later.
|
|
void LTOModule::addPotentialUndefinedSymbol(const object::BasicSymbolRef &Sym,
|
|
bool isFunc) {
|
|
SmallString<64> name;
|
|
{
|
|
raw_svector_ostream OS(name);
|
|
Sym.printName(OS);
|
|
}
|
|
|
|
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();
|
|
|
|
const GlobalValue *decl = IRFile->getSymbolGV(Sym.getRawDataRefImpl());
|
|
|
|
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);
|
|
}
|
|
|
|
/// 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) {
|
|
for (auto &Sym : IRFile->symbols()) {
|
|
const GlobalValue *GV = IRFile->getSymbolGV(Sym.getRawDataRefImpl());
|
|
uint32_t Flags = Sym.getFlags();
|
|
if (Flags & object::BasicSymbolRef::SF_FormatSpecific)
|
|
continue;
|
|
|
|
bool IsUndefined = Flags & object::BasicSymbolRef::SF_Undefined;
|
|
|
|
if (!GV) {
|
|
SmallString<64> Buffer;
|
|
{
|
|
raw_svector_ostream OS(Buffer);
|
|
Sym.printName(OS);
|
|
}
|
|
const char *Name = Buffer.c_str();
|
|
|
|
if (IsUndefined)
|
|
addAsmGlobalSymbolUndef(Name);
|
|
else if (Flags & object::BasicSymbolRef::SF_Global)
|
|
addAsmGlobalSymbol(Name, LTO_SYMBOL_SCOPE_DEFAULT);
|
|
else
|
|
addAsmGlobalSymbol(Name, LTO_SYMBOL_SCOPE_INTERNAL);
|
|
continue;
|
|
}
|
|
|
|
auto *F = dyn_cast<Function>(GV);
|
|
if (IsUndefined) {
|
|
addPotentialUndefinedSymbol(Sym, F != nullptr);
|
|
continue;
|
|
}
|
|
|
|
if (F) {
|
|
addDefinedFunctionSymbol(Sym);
|
|
continue;
|
|
}
|
|
|
|
if (isa<GlobalVariable>(GV)) {
|
|
addDefinedDataSymbol(Sym);
|
|
continue;
|
|
}
|
|
|
|
assert(isa<GlobalAlias>(GV));
|
|
addDefinedDataSymbol(Sym);
|
|
}
|
|
|
|
// 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 = getModule().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->getSubtargetImpl()
|
|
->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.
|
|
}
|