| //===-- 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 "LTOModule.h" |
| |
| #include "llvm/Constants.h" |
| #include "llvm/LLVMContext.h" |
| #include "llvm/Module.h" |
| #include "llvm/ADT/OwningPtr.h" |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/Bitcode/ReaderWriter.h" |
| #include "llvm/Support/SystemUtils.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/Host.h" |
| #include "llvm/Support/Path.h" |
| #include "llvm/Support/Process.h" |
| #include "llvm/Support/SourceMgr.h" |
| #include "llvm/Support/system_error.h" |
| #include "llvm/Target/Mangler.h" |
| #include "llvm/Target/SubtargetFeature.h" |
| #include "llvm/MC/MCAsmInfo.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCInst.h" |
| #include "llvm/MC/MCParser/MCAsmParser.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/Target/TargetAsmParser.h" |
| #include "llvm/Target/TargetMachine.h" |
| #include "llvm/Target/TargetRegistry.h" |
| #include "llvm/Target/TargetSelect.h" |
| |
| using namespace llvm; |
| |
| bool LTOModule::isBitcodeFile(const void *mem, size_t length) { |
| return llvm::sys::IdentifyFileType((char*)mem, length) |
| == llvm::sys::Bitcode_FileType; |
| } |
| |
| bool LTOModule::isBitcodeFile(const char *path) { |
| return llvm::sys::Path(path).isBitcodeFile(); |
| } |
| |
| 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); |
| } |
| |
| // Takes ownership of buffer. |
| 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); |
| } |
| |
| |
| LTOModule::LTOModule(Module *m, TargetMachine *t) |
| : _module(m), _target(t) |
| { |
| } |
| |
| 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.get(), errMsg); |
| } |
| |
| LTOModule *LTOModule::makeLTOModule(int fd, const char *path, |
| off_t size, |
| std::string &errMsg) { |
| OwningPtr<MemoryBuffer> buffer; |
| if (error_code ec = MemoryBuffer::getOpenFile(fd, path, buffer, size)) { |
| errMsg = ec.message(); |
| return NULL; |
| } |
| return makeLTOModule(buffer.get(), errMsg); |
| } |
| |
| /// makeBuffer - Create a MemoryBuffer from a memory range. MemoryBuffer |
| /// requires the byte past end of the buffer to be a zero. We might get lucky |
| /// and already be that way, otherwise make a copy. Also if next byte is on a |
| /// different page, don't assume it is readable. |
| MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length) { |
| const char *startPtr = (char*)mem; |
| const char *endPtr = startPtr+length; |
| if (((uintptr_t)endPtr & (sys::Process::GetPageSize()-1)) == 0 || |
| *endPtr != 0) |
| return MemoryBuffer::getMemBufferCopy(StringRef(startPtr, length)); |
| |
| return MemoryBuffer::getMemBuffer(StringRef(startPtr, length)); |
| } |
| |
| |
| 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.get(), errMsg); |
| } |
| |
| LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer, |
| std::string &errMsg) { |
| static bool Initialized = false; |
| if (!Initialized) { |
| InitializeAllTargets(); |
| InitializeAllAsmParsers(); |
| Initialized = true; |
| } |
| |
| // parse bitcode buffer |
| OwningPtr<Module> m(ParseBitcodeFile(buffer, getGlobalContext(), &errMsg)); |
| if (!m) |
| return NULL; |
| |
| std::string Triple = m->getTargetTriple(); |
| if (Triple.empty()) |
| Triple = sys::getHostTriple(); |
| |
| // find machine architecture for this module |
| const Target *march = TargetRegistry::lookupTarget(Triple, errMsg); |
| if (!march) |
| return NULL; |
| |
| // construct LTModule, hand over ownership of module and target |
| SubtargetFeatures Features; |
| Features.getDefaultSubtargetFeatures("" /* cpu */, llvm::Triple(Triple)); |
| std::string FeatureStr = Features.getString(); |
| TargetMachine *target = march->createTargetMachine(Triple, FeatureStr); |
| LTOModule *Ret = new LTOModule(m.take(), target); |
| bool Err = Ret->ParseSymbols(); |
| if (Err) { |
| delete Ret; |
| return NULL; |
| } |
| return Ret; |
| } |
| |
| |
| const char *LTOModule::getTargetTriple() { |
| return _module->getTargetTriple().c_str(); |
| } |
| |
| void LTOModule::setTargetTriple(const char *triple) { |
| _module->setTargetTriple(triple); |
| } |
| |
| void LTOModule::addDefinedFunctionSymbol(Function *f, Mangler &mangler) { |
| // add to list of defined symbols |
| addDefinedSymbol(f, mangler, true); |
| |
| // add external symbols referenced by this function. |
| for (Function::iterator b = f->begin(); b != f->end(); ++b) { |
| for (BasicBlock::iterator i = b->begin(); i != b->end(); ++i) { |
| for (unsigned count = 0, total = i->getNumOperands(); |
| count != total; ++count) { |
| findExternalRefs(i->getOperand(count), mangler); |
| } |
| } |
| } |
| } |
| |
| // Get string that data pointer points to. |
| bool LTOModule::objcClassNameFromExpression(Constant *c, std::string &name) { |
| if (ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) { |
| Constant *op = ce->getOperand(0); |
| if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) { |
| Constant *cn = gvn->getInitializer(); |
| if (ConstantArray *ca = dyn_cast<ConstantArray>(cn)) { |
| if (ca->isCString()) { |
| name = ".objc_class_name_" + ca->getAsString(); |
| return true; |
| } |
| } |
| } |
| } |
| return false; |
| } |
| |
| // Parse i386/ppc ObjC class data structure. |
| void LTOModule::addObjCClass(GlobalVariable *clgv) { |
| if (ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer())) { |
| // 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.c_str()); |
| if (!entry.getValue().name) { |
| const char *symbolName = entry.getKey().data(); |
| info.name = symbolName; |
| info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; |
| 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.c_str()); |
| entry.setValue(1); |
| NameAndAttributes info; |
| info.name = entry.getKey().data(); |
| info.attributes = (lto_symbol_attributes) |
| (LTO_SYMBOL_PERMISSIONS_DATA | |
| LTO_SYMBOL_DEFINITION_REGULAR | |
| LTO_SYMBOL_SCOPE_DEFAULT); |
| _symbols.push_back(info); |
| } |
| } |
| } |
| |
| |
| // Parse i386/ppc ObjC category data structure. |
| void LTOModule::addObjCCategory(GlobalVariable *clgv) { |
| if (ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer())) { |
| // second slot in __OBJC,__category is pointer to target class name |
| std::string targetclassName; |
| if (objcClassNameFromExpression(c->getOperand(1), targetclassName)) { |
| NameAndAttributes info; |
| |
| StringMap<NameAndAttributes>::value_type &entry = |
| _undefines.GetOrCreateValue(targetclassName.c_str()); |
| |
| if (entry.getValue().name) |
| return; |
| |
| const char *symbolName = entry.getKey().data(); |
| info.name = symbolName; |
| info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; |
| entry.setValue(info); |
| } |
| } |
| } |
| |
| |
| // Parse i386/ppc ObjC class list data structure. |
| void LTOModule::addObjCClassRef(GlobalVariable *clgv) { |
| std::string targetclassName; |
| if (objcClassNameFromExpression(clgv->getInitializer(), targetclassName)) { |
| NameAndAttributes info; |
| |
| StringMap<NameAndAttributes>::value_type &entry = |
| _undefines.GetOrCreateValue(targetclassName.c_str()); |
| if (entry.getValue().name) |
| return; |
| |
| const char *symbolName = entry.getKey().data(); |
| info.name = symbolName; |
| info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; |
| entry.setValue(info); |
| } |
| } |
| |
| |
| void LTOModule::addDefinedDataSymbol(GlobalValue *v, Mangler &mangler) { |
| // Add to list of defined symbols. |
| addDefinedSymbol(v, mangler, false); |
| |
| // 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. |
| if (v->hasSection() /* && isTargetDarwin */) { |
| // special case if this data blob is an ObjC class definition |
| if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) { |
| if (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 (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 (GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) { |
| addObjCClassRef(gv); |
| } |
| } |
| } |
| |
| // add external symbols referenced by this data. |
| for (unsigned count = 0, total = v->getNumOperands(); |
| count != total; ++count) { |
| findExternalRefs(v->getOperand(count), mangler); |
| } |
| } |
| |
| |
| void LTOModule::addDefinedSymbol(GlobalValue *def, Mangler &mangler, |
| bool isFunction) { |
| // ignore all llvm.* symbols |
| if (def->getName().startswith("llvm.")) |
| return; |
| |
| // ignore available_externally |
| if (def->hasAvailableExternallyLinkage()) |
| 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_32(def->getAlignment()) : 0; |
| |
| // set permissions part |
| if (isFunction) |
| attr |= LTO_SYMBOL_PERMISSIONS_CODE; |
| else { |
| 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() || |
| def->hasLinkerPrivateWeakDefAutoLinkage()) |
| 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->hasLinkerPrivateWeakDefAutoLinkage()) |
| attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN; |
| else |
| attr |= LTO_SYMBOL_SCOPE_INTERNAL; |
| |
| // add to table of symbols |
| NameAndAttributes info; |
| StringSet::value_type &entry = _defines.GetOrCreateValue(Buffer.c_str()); |
| entry.setValue(1); |
| |
| StringRef Name = entry.getKey(); |
| info.name = Name.data(); |
| assert(info.name[Name.size()] == '\0'); |
| info.attributes = (lto_symbol_attributes)attr; |
| _symbols.push_back(info); |
| } |
| |
| 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); |
| const char *symbolName = entry.getKey().data(); |
| uint32_t attr = LTO_SYMBOL_DEFINITION_REGULAR; |
| attr |= scope; |
| NameAndAttributes info; |
| info.name = symbolName; |
| info.attributes = (lto_symbol_attributes)attr; |
| _symbols.push_back(info); |
| } |
| |
| 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 = (lto_symbol_attributes)attr; |
| |
| entry.setValue(info); |
| } |
| |
| void LTOModule::addPotentialUndefinedSymbol(GlobalValue *decl, |
| Mangler &mangler) { |
| // 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.c_str()); |
| |
| // 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; |
| |
| entry.setValue(info); |
| } |
| |
| |
| |
| // Find external symbols referenced by VALUE. This is a recursive function. |
| void LTOModule::findExternalRefs(Value *value, Mangler &mangler) { |
| if (GlobalValue *gv = dyn_cast<GlobalValue>(value)) { |
| if (!gv->hasExternalLinkage()) |
| addPotentialUndefinedSymbol(gv, mangler); |
| // If this is a variable definition, do not recursively process |
| // initializer. It might contain a reference to this variable |
| // and cause an infinite loop. The initializer will be |
| // processed in addDefinedDataSymbol(). |
| return; |
| } |
| |
| // GlobalValue, even with InternalLinkage type, may have operands with |
| // ExternalLinkage type. Do not ignore these operands. |
| if (Constant *c = dyn_cast<Constant>(value)) { |
| // Handle ConstantExpr, ConstantStruct, ConstantArry etc. |
| for (unsigned i = 0, e = c->getNumOperands(); i != e; ++i) |
| findExternalRefs(c->getOperand(i), mangler); |
| } |
| } |
| |
| 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) {} |
| |
| virtual void ChangeSection(const MCSection *Section) {} |
| virtual void InitSections() {} |
| virtual void EmitLabel(MCSymbol *Symbol) { |
| Symbol->setSection(*getCurrentSection()); |
| markDefined(*Symbol); |
| } |
| virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {} |
| virtual void EmitThumbFunc(MCSymbol *Func) {} |
| virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) { |
| // FIXME: should we handle aliases? |
| markDefined(*Symbol); |
| } |
| virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) { |
| if (Attribute == MCSA_Global) |
| markGlobal(*Symbol); |
| } |
| 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 EmitZerofill(const MCSection *Section, MCSymbol *Symbol, |
| unsigned Size , unsigned ByteAlignment) { |
| markDefined(*Symbol); |
| } |
| virtual void EmitCOFFSymbolType(int Type) {} |
| virtual void EndCOFFSymbolDef() {} |
| virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, |
| unsigned ByteAlignment) { |
| markDefined(*Symbol); |
| } |
| virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {} |
| virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {} |
| virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, |
| uint64_t Size, unsigned ByteAlignment) {} |
| virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {} |
| virtual void EmitValueImpl(const MCExpr *Value, unsigned Size, |
| bool isPCRel, unsigned AddrSpace) {} |
| virtual void EmitULEB128Value(const MCExpr *Value, |
| unsigned AddrSpace = 0) {} |
| virtual void EmitSLEB128Value(const MCExpr *Value, |
| unsigned AddrSpace = 0) {} |
| virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value, |
| unsigned ValueSize, |
| unsigned MaxBytesToEmit) {} |
| virtual void EmitCodeAlignment(unsigned ByteAlignment, |
| unsigned MaxBytesToEmit) {} |
| virtual void EmitValueToOffset(const MCExpr *Offset, |
| unsigned char Value ) {} |
| virtual void EmitFileDirective(StringRef Filename) {} |
| virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta, |
| const MCSymbol *LastLabel, |
| const MCSymbol *Label) {} |
| |
| 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 Finish() {} |
| }; |
| } |
| |
| bool LTOModule::addAsmGlobalSymbols(MCContext &Context) { |
| const std::string &inlineAsm = _module->getModuleInlineAsm(); |
| |
| OwningPtr<RecordStreamer> Streamer(new RecordStreamer(Context)); |
| MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(inlineAsm); |
| SourceMgr SrcMgr; |
| SrcMgr.AddNewSourceBuffer(Buffer, SMLoc()); |
| OwningPtr<MCAsmParser> Parser(createMCAsmParser(_target->getTarget(), SrcMgr, |
| Context, *Streamer, |
| *_target->getMCAsmInfo())); |
| OwningPtr<TargetAsmParser> |
| TAP(_target->getTarget().createAsmParser(*Parser.get(), *_target.get())); |
| Parser->setTargetParser(*TAP); |
| int Res = Parser->Run(false); |
| if (Res) |
| 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; |
| } |
| |
| bool LTOModule::ParseSymbols() { |
| // Use mangler to add GlobalPrefix to names to match linker names. |
| MCContext Context(*_target->getMCAsmInfo(), NULL); |
| Mangler mangler(Context, *_target->getTargetData()); |
| |
| // add functions |
| for (Module::iterator f = _module->begin(); f != _module->end(); ++f) { |
| if (f->isDeclaration()) |
| addPotentialUndefinedSymbol(f, mangler); |
| else |
| addDefinedFunctionSymbol(f, mangler); |
| } |
| |
| // add data |
| for (Module::global_iterator v = _module->global_begin(), |
| e = _module->global_end(); v != e; ++v) { |
| if (v->isDeclaration()) |
| addPotentialUndefinedSymbol(v, mangler); |
| else |
| addDefinedDataSymbol(v, mangler); |
| } |
| |
| // add asm globals |
| if (addAsmGlobalSymbols(Context)) |
| return true; |
| |
| // add aliases |
| for (Module::alias_iterator i = _module->alias_begin(), |
| e = _module->alias_end(); i != e; ++i) { |
| if (i->isDeclaration()) |
| addPotentialUndefinedSymbol(i, mangler); |
| else |
| addDefinedDataSymbol(i, mangler); |
| } |
| |
| // make symbols for all undefines |
| for (StringMap<NameAndAttributes>::iterator it=_undefines.begin(); |
| it != _undefines.end(); ++it) { |
| // if this symbol also has a definition, then don't make an undefine |
| // because it is a tentative definition |
| if (_defines.count(it->getKey()) == 0) { |
| NameAndAttributes info = it->getValue(); |
| _symbols.push_back(info); |
| } |
| } |
| return false; |
| } |
| |
| |
| uint32_t LTOModule::getSymbolCount() { |
| return _symbols.size(); |
| } |
| |
| |
| lto_symbol_attributes LTOModule::getSymbolAttributes(uint32_t index) { |
| if (index < _symbols.size()) |
| return _symbols[index].attributes; |
| else |
| return lto_symbol_attributes(0); |
| } |
| |
| const char *LTOModule::getSymbolName(uint32_t index) { |
| if (index < _symbols.size()) |
| return _symbols[index].name; |
| else |
| return NULL; |
| } |