1 //===-- LTOModule.cpp - LLVM Link Time Optimizer --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Link Time Optimization library. This library is
11 // intended to be used by linker to optimize code at link time.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/LTO/LTOModule.h"
16 #include "llvm/ADT/OwningPtr.h"
17 #include "llvm/ADT/Triple.h"
18 #include "llvm/Bitcode/ReaderWriter.h"
19 #include "llvm/IR/Constants.h"
20 #include "llvm/IR/LLVMContext.h"
21 #include "llvm/IR/Metadata.h"
22 #include "llvm/IR/Module.h"
23 #include "llvm/MC/MCExpr.h"
24 #include "llvm/MC/MCInst.h"
25 #include "llvm/MC/MCInstrInfo.h"
26 #include "llvm/MC/MCParser/MCAsmParser.h"
27 #include "llvm/MC/MCSection.h"
28 #include "llvm/MC/MCStreamer.h"
29 #include "llvm/MC/MCSubtargetInfo.h"
30 #include "llvm/MC/MCSymbol.h"
31 #include "llvm/MC/MCTargetAsmParser.h"
32 #include "llvm/MC/SubtargetFeature.h"
33 #include "llvm/Support/CommandLine.h"
34 #include "llvm/Support/FileSystem.h"
35 #include "llvm/Support/Host.h"
36 #include "llvm/Support/MemoryBuffer.h"
37 #include "llvm/Support/Path.h"
38 #include "llvm/Support/SourceMgr.h"
39 #include "llvm/Support/TargetRegistry.h"
40 #include "llvm/Support/TargetSelect.h"
41 #include "llvm/Support/system_error.h"
42 #include "llvm/Target/TargetLowering.h"
43 #include "llvm/Target/TargetLoweringObjectFile.h"
44 #include "llvm/Target/TargetRegisterInfo.h"
45 #include "llvm/Transforms/Utils/GlobalStatus.h"
48 LTOModule::LTOModule(llvm::Module *m, llvm::TargetMachine *t)
49 : _module(m), _target(t),
50 _context(_target->getMCAsmInfo(), _target->getRegisterInfo(), &ObjFileInfo),
51 _mangler(t->getDataLayout()) {
52 ObjFileInfo.InitMCObjectFileInfo(t->getTargetTriple(),
53 t->getRelocationModel(), t->getCodeModel(),
57 /// isBitcodeFile - Returns 'true' if the file (or memory contents) is LLVM
59 bool LTOModule::isBitcodeFile(const void *mem, size_t length) {
60 return sys::fs::identify_magic(StringRef((const char *)mem, length)) ==
61 sys::fs::file_magic::bitcode;
64 bool LTOModule::isBitcodeFile(const char *path) {
65 sys::fs::file_magic type;
66 if (sys::fs::identify_magic(path, type))
68 return type == sys::fs::file_magic::bitcode;
71 /// isBitcodeFileForTarget - Returns 'true' if the file (or memory contents) is
72 /// LLVM bitcode for the specified triple.
73 bool LTOModule::isBitcodeFileForTarget(const void *mem, size_t length,
74 const char *triplePrefix) {
75 MemoryBuffer *buffer = makeBuffer(mem, length);
78 return isTargetMatch(buffer, triplePrefix);
81 bool LTOModule::isBitcodeFileForTarget(const char *path,
82 const char *triplePrefix) {
83 OwningPtr<MemoryBuffer> buffer;
84 if (MemoryBuffer::getFile(path, buffer))
86 return isTargetMatch(buffer.release(), triplePrefix);
89 /// isTargetMatch - Returns 'true' if the memory buffer is for the specified
91 bool LTOModule::isTargetMatch(MemoryBuffer *buffer, const char *triplePrefix) {
92 std::string Triple = getBitcodeTargetTriple(buffer, getGlobalContext());
94 return strncmp(Triple.c_str(), triplePrefix, strlen(triplePrefix)) == 0;
97 /// makeLTOModule - Create an LTOModule. N.B. These methods take ownership of
99 LTOModule *LTOModule::makeLTOModule(const char *path, TargetOptions options,
100 std::string &errMsg) {
101 OwningPtr<MemoryBuffer> buffer;
102 if (error_code ec = MemoryBuffer::getFile(path, buffer)) {
103 errMsg = ec.message();
106 return makeLTOModule(buffer.release(), options, errMsg);
109 LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
110 size_t size, TargetOptions options,
111 std::string &errMsg) {
112 return makeLTOModule(fd, path, size, 0, options, errMsg);
115 LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
118 TargetOptions options,
119 std::string &errMsg) {
120 OwningPtr<MemoryBuffer> buffer;
122 MemoryBuffer::getOpenFileSlice(fd, path, buffer, map_size, offset)) {
123 errMsg = ec.message();
126 return makeLTOModule(buffer.release(), options, errMsg);
129 LTOModule *LTOModule::makeLTOModule(const void *mem, size_t length,
130 TargetOptions options,
131 std::string &errMsg, StringRef path) {
132 OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length, path));
135 return makeLTOModule(buffer.release(), options, errMsg);
138 LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer,
139 TargetOptions options,
140 std::string &errMsg) {
141 // parse bitcode buffer
142 ErrorOr<Module *> ModuleOrErr =
143 getLazyBitcodeModule(buffer, getGlobalContext());
144 if (error_code EC = ModuleOrErr.getError()) {
145 errMsg = EC.message();
149 OwningPtr<Module> m(ModuleOrErr.get());
151 std::string TripleStr = m->getTargetTriple();
152 if (TripleStr.empty())
153 TripleStr = sys::getDefaultTargetTriple();
154 llvm::Triple Triple(TripleStr);
156 // find machine architecture for this module
157 const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
161 // construct LTOModule, hand over ownership of module and target
162 SubtargetFeatures Features;
163 Features.getDefaultSubtargetFeatures(Triple);
164 std::string FeatureStr = Features.getString();
165 // Set a default CPU for Darwin triples.
167 if (Triple.isOSDarwin()) {
168 if (Triple.getArch() == llvm::Triple::x86_64)
170 else if (Triple.getArch() == llvm::Triple::x86)
174 TargetMachine *target = march->createTargetMachine(TripleStr, CPU, FeatureStr,
176 m->materializeAllPermanently();
178 LTOModule *Ret = new LTOModule(m.release(), target);
180 // We need a MCContext set up in order to get mangled names of private
181 // symbols. It is a bit odd that we need to report uses and definitions
182 // of private symbols, but it does look like ld64 expects to be informed
183 // of at least the ones with an 'l' prefix.
184 MCContext &Context = Ret->_context;
185 const TargetLoweringObjectFile &TLOF =
186 target->getTargetLowering()->getObjFileLowering();
187 const_cast<TargetLoweringObjectFile &>(TLOF).Initialize(Context, *target);
189 if (Ret->parseSymbols(errMsg)) {
194 Ret->parseMetadata();
199 /// Create a MemoryBuffer from a memory range with an optional name.
200 MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length,
202 const char *startPtr = (const char*)mem;
203 return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), name, false);
206 /// objcClassNameFromExpression - Get string that the data pointer points to.
208 LTOModule::objcClassNameFromExpression(const Constant *c, std::string &name) {
209 if (const ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) {
210 Constant *op = ce->getOperand(0);
211 if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) {
212 Constant *cn = gvn->getInitializer();
213 if (ConstantDataArray *ca = dyn_cast<ConstantDataArray>(cn)) {
214 if (ca->isCString()) {
215 name = ".objc_class_name_" + ca->getAsCString().str();
224 /// addObjCClass - Parse i386/ppc ObjC class data structure.
225 void LTOModule::addObjCClass(const GlobalVariable *clgv) {
226 const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
229 // second slot in __OBJC,__class is pointer to superclass name
230 std::string superclassName;
231 if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
232 NameAndAttributes info;
233 StringMap<NameAndAttributes>::value_type &entry =
234 _undefines.GetOrCreateValue(superclassName);
235 if (!entry.getValue().name) {
236 const char *symbolName = entry.getKey().data();
237 info.name = symbolName;
238 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
239 info.isFunction = false;
241 entry.setValue(info);
245 // third slot in __OBJC,__class is pointer to class name
246 std::string className;
247 if (objcClassNameFromExpression(c->getOperand(2), className)) {
248 StringSet::value_type &entry = _defines.GetOrCreateValue(className);
251 NameAndAttributes info;
252 info.name = entry.getKey().data();
253 info.attributes = LTO_SYMBOL_PERMISSIONS_DATA |
254 LTO_SYMBOL_DEFINITION_REGULAR | LTO_SYMBOL_SCOPE_DEFAULT;
255 info.isFunction = false;
257 _symbols.push_back(info);
261 /// addObjCCategory - Parse i386/ppc ObjC category data structure.
262 void LTOModule::addObjCCategory(const GlobalVariable *clgv) {
263 const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
266 // second slot in __OBJC,__category is pointer to target class name
267 std::string targetclassName;
268 if (!objcClassNameFromExpression(c->getOperand(1), targetclassName))
271 NameAndAttributes info;
272 StringMap<NameAndAttributes>::value_type &entry =
273 _undefines.GetOrCreateValue(targetclassName);
275 if (entry.getValue().name)
278 const char *symbolName = entry.getKey().data();
279 info.name = symbolName;
280 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
281 info.isFunction = false;
283 entry.setValue(info);
286 /// addObjCClassRef - Parse i386/ppc ObjC class list data structure.
287 void LTOModule::addObjCClassRef(const GlobalVariable *clgv) {
288 std::string targetclassName;
289 if (!objcClassNameFromExpression(clgv->getInitializer(), targetclassName))
292 NameAndAttributes info;
293 StringMap<NameAndAttributes>::value_type &entry =
294 _undefines.GetOrCreateValue(targetclassName);
295 if (entry.getValue().name)
298 const char *symbolName = entry.getKey().data();
299 info.name = symbolName;
300 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
301 info.isFunction = false;
303 entry.setValue(info);
306 /// addDefinedDataSymbol - Add a data symbol as defined to the list.
307 void LTOModule::addDefinedDataSymbol(const GlobalValue *v) {
308 // Add to list of defined symbols.
309 addDefinedSymbol(v, false);
311 if (!v->hasSection() /* || !isTargetDarwin */)
314 // Special case i386/ppc ObjC data structures in magic sections:
315 // The issue is that the old ObjC object format did some strange
316 // contortions to avoid real linker symbols. For instance, the
317 // ObjC class data structure is allocated statically in the executable
318 // that defines that class. That data structures contains a pointer to
319 // its superclass. But instead of just initializing that part of the
320 // struct to the address of its superclass, and letting the static and
321 // dynamic linkers do the rest, the runtime works by having that field
322 // instead point to a C-string that is the name of the superclass.
323 // At runtime the objc initialization updates that pointer and sets
324 // it to point to the actual super class. As far as the linker
325 // knows it is just a pointer to a string. But then someone wanted the
326 // linker to issue errors at build time if the superclass was not found.
327 // So they figured out a way in mach-o object format to use an absolute
328 // symbols (.objc_class_name_Foo = 0) and a floating reference
329 // (.reference .objc_class_name_Bar) to cause the linker into erroring when
330 // a class was missing.
331 // The following synthesizes the implicit .objc_* symbols for the linker
332 // from the ObjC data structures generated by the front end.
334 // special case if this data blob is an ObjC class definition
335 if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) {
336 if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
341 // special case if this data blob is an ObjC category definition
342 else if (v->getSection().compare(0, 18, "__OBJC,__category,") == 0) {
343 if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
348 // special case if this data blob is the list of referenced classes
349 else if (v->getSection().compare(0, 18, "__OBJC,__cls_refs,") == 0) {
350 if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
356 /// addDefinedFunctionSymbol - Add a function symbol as defined to the list.
357 void LTOModule::addDefinedFunctionSymbol(const Function *f) {
358 // add to list of defined symbols
359 addDefinedSymbol(f, true);
362 static bool canBeHidden(const GlobalValue *GV) {
363 // FIXME: this is duplicated with another static function in AsmPrinter.cpp
364 GlobalValue::LinkageTypes L = GV->getLinkage();
366 if (L != GlobalValue::LinkOnceODRLinkage)
369 if (GV->hasUnnamedAddr())
372 // If it is a non constant variable, it needs to be uniqued across shared
374 if (const GlobalVariable *Var = dyn_cast<GlobalVariable>(GV)) {
375 if (!Var->isConstant())
380 if (GlobalStatus::analyzeGlobal(GV, GS))
383 return !GS.IsCompared;
386 /// addDefinedSymbol - Add a defined symbol to the list.
387 void LTOModule::addDefinedSymbol(const GlobalValue *def, bool isFunction) {
388 // ignore all llvm.* symbols
389 if (def->getName().startswith("llvm."))
392 // string is owned by _defines
393 SmallString<64> Buffer;
394 _target->getNameWithPrefix(Buffer, def, _mangler);
396 // set alignment part log2() can have rounding errors
397 uint32_t align = def->getAlignment();
398 uint32_t attr = align ? countTrailingZeros(def->getAlignment()) : 0;
400 // set permissions part
402 attr |= LTO_SYMBOL_PERMISSIONS_CODE;
404 const GlobalVariable *gv = dyn_cast<GlobalVariable>(def);
405 if (gv && gv->isConstant())
406 attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
408 attr |= LTO_SYMBOL_PERMISSIONS_DATA;
411 // set definition part
412 if (def->hasWeakLinkage() || def->hasLinkOnceLinkage() ||
413 def->hasLinkerPrivateWeakLinkage())
414 attr |= LTO_SYMBOL_DEFINITION_WEAK;
415 else if (def->hasCommonLinkage())
416 attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
418 attr |= LTO_SYMBOL_DEFINITION_REGULAR;
421 if (def->hasHiddenVisibility())
422 attr |= LTO_SYMBOL_SCOPE_HIDDEN;
423 else if (def->hasProtectedVisibility())
424 attr |= LTO_SYMBOL_SCOPE_PROTECTED;
425 else if (canBeHidden(def))
426 attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
427 else if (def->hasExternalLinkage() || def->hasWeakLinkage() ||
428 def->hasLinkOnceLinkage() || def->hasCommonLinkage() ||
429 def->hasLinkerPrivateWeakLinkage())
430 attr |= LTO_SYMBOL_SCOPE_DEFAULT;
432 attr |= LTO_SYMBOL_SCOPE_INTERNAL;
434 StringSet::value_type &entry = _defines.GetOrCreateValue(Buffer);
437 // fill information structure
438 NameAndAttributes info;
439 StringRef Name = entry.getKey();
440 info.name = Name.data();
441 assert(info.name[Name.size()] == '\0');
442 info.attributes = attr;
443 info.isFunction = isFunction;
446 // add to table of symbols
447 _symbols.push_back(info);
450 /// addAsmGlobalSymbol - Add a global symbol from module-level ASM to the
452 void LTOModule::addAsmGlobalSymbol(const char *name,
453 lto_symbol_attributes scope) {
454 StringSet::value_type &entry = _defines.GetOrCreateValue(name);
456 // only add new define if not already defined
457 if (entry.getValue())
462 NameAndAttributes &info = _undefines[entry.getKey().data()];
464 if (info.symbol == 0) {
465 // FIXME: This is trying to take care of module ASM like this:
467 // module asm ".zerofill __FOO, __foo, _bar_baz_qux, 0"
469 // but is gross and its mother dresses it funny. Have the ASM parser give us
470 // more details for this type of situation so that we're not guessing so
473 // fill information structure
474 info.name = entry.getKey().data();
476 LTO_SYMBOL_PERMISSIONS_DATA | LTO_SYMBOL_DEFINITION_REGULAR | scope;
477 info.isFunction = false;
480 // add to table of symbols
481 _symbols.push_back(info);
486 addDefinedFunctionSymbol(cast<Function>(info.symbol));
488 addDefinedDataSymbol(info.symbol);
490 _symbols.back().attributes &= ~LTO_SYMBOL_SCOPE_MASK;
491 _symbols.back().attributes |= scope;
494 /// addAsmGlobalSymbolUndef - Add a global symbol from module-level ASM to the
496 void LTOModule::addAsmGlobalSymbolUndef(const char *name) {
497 StringMap<NameAndAttributes>::value_type &entry =
498 _undefines.GetOrCreateValue(name);
500 _asm_undefines.push_back(entry.getKey().data());
502 // we already have the symbol
503 if (entry.getValue().name)
506 uint32_t attr = LTO_SYMBOL_DEFINITION_UNDEFINED;;
507 attr |= LTO_SYMBOL_SCOPE_DEFAULT;
508 NameAndAttributes info;
509 info.name = entry.getKey().data();
510 info.attributes = attr;
511 info.isFunction = false;
514 entry.setValue(info);
517 /// addPotentialUndefinedSymbol - Add a symbol which isn't defined just yet to a
518 /// list to be resolved later.
520 LTOModule::addPotentialUndefinedSymbol(const GlobalValue *decl, bool isFunc) {
521 // ignore all llvm.* symbols
522 if (decl->getName().startswith("llvm."))
525 // ignore all aliases
526 if (isa<GlobalAlias>(decl))
529 SmallString<64> name;
530 _target->getNameWithPrefix(name, decl, _mangler);
532 StringMap<NameAndAttributes>::value_type &entry =
533 _undefines.GetOrCreateValue(name);
535 // we already have the symbol
536 if (entry.getValue().name)
539 NameAndAttributes info;
541 info.name = entry.getKey().data();
543 if (decl->hasExternalWeakLinkage())
544 info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
546 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
548 info.isFunction = isFunc;
551 entry.setValue(info);
556 class RecordStreamer : public MCStreamer {
558 enum State { NeverSeen, Global, Defined, DefinedGlobal, Used };
561 StringMap<State> Symbols;
563 void markDefined(const MCSymbol &Symbol) {
564 State &S = Symbols[Symbol.getName()];
577 void markGlobal(const MCSymbol &Symbol) {
578 State &S = Symbols[Symbol.getName()];
592 void markUsed(const MCSymbol &Symbol) {
593 State &S = Symbols[Symbol.getName()];
607 // FIXME: mostly copied for the obj streamer.
608 void AddValueSymbols(const MCExpr *Value) {
609 switch (Value->getKind()) {
611 // FIXME: What should we do in here?
614 case MCExpr::Constant:
617 case MCExpr::Binary: {
618 const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
619 AddValueSymbols(BE->getLHS());
620 AddValueSymbols(BE->getRHS());
624 case MCExpr::SymbolRef:
625 markUsed(cast<MCSymbolRefExpr>(Value)->getSymbol());
629 AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
635 typedef StringMap<State>::const_iterator const_iterator;
637 const_iterator begin() {
638 return Symbols.begin();
641 const_iterator end() {
642 return Symbols.end();
645 RecordStreamer(MCContext &Context) : MCStreamer(Context) {}
647 virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) {
649 for (unsigned i = Inst.getNumOperands(); i--; )
650 if (Inst.getOperand(i).isExpr())
651 AddValueSymbols(Inst.getOperand(i).getExpr());
653 virtual void EmitLabel(MCSymbol *Symbol) {
654 Symbol->setSection(*getCurrentSection().first);
655 markDefined(*Symbol);
657 virtual void EmitDebugLabel(MCSymbol *Symbol) {
660 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
661 // FIXME: should we handle aliases?
662 markDefined(*Symbol);
664 virtual bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) {
665 if (Attribute == MCSA_Global)
669 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
670 uint64_t Size , unsigned ByteAlignment) {
671 markDefined(*Symbol);
673 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
674 unsigned ByteAlignment) {
675 markDefined(*Symbol);
678 virtual void EmitBundleAlignMode(unsigned AlignPow2) {}
679 virtual void EmitBundleLock(bool AlignToEnd) {}
680 virtual void EmitBundleUnlock() {}
683 virtual void ChangeSection(const MCSection *Section,
684 const MCExpr *Subsection) {}
685 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
686 virtual void EmitThumbFunc(MCSymbol *Func) {}
687 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
688 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
689 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
690 virtual void EmitCOFFSymbolStorageClass(int StorageClass) {}
691 virtual void EmitCOFFSymbolType(int Type) {}
692 virtual void EndCOFFSymbolDef() {}
693 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
694 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
695 unsigned ByteAlignment) {}
696 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
697 uint64_t Size, unsigned ByteAlignment) {}
698 virtual void EmitBytes(StringRef Data) {}
699 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size) {}
700 virtual void EmitULEB128Value(const MCExpr *Value) {}
701 virtual void EmitSLEB128Value(const MCExpr *Value) {}
702 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
704 unsigned MaxBytesToEmit) {}
705 virtual void EmitCodeAlignment(unsigned ByteAlignment,
706 unsigned MaxBytesToEmit) {}
707 virtual bool EmitValueToOffset(const MCExpr *Offset,
708 unsigned char Value ) { return false; }
709 virtual void EmitFileDirective(StringRef Filename) {}
710 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
711 const MCSymbol *LastLabel,
712 const MCSymbol *Label,
713 unsigned PointerSize) {}
714 virtual void FinishImpl() {}
715 virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
716 RecordProcEnd(Frame);
719 } // end anonymous namespace
721 /// addAsmGlobalSymbols - Add global symbols from module-level ASM to the
722 /// defined or undefined lists.
723 bool LTOModule::addAsmGlobalSymbols(std::string &errMsg) {
724 const std::string &inlineAsm = _module->getModuleInlineAsm();
725 if (inlineAsm.empty())
728 OwningPtr<RecordStreamer> Streamer(new RecordStreamer(_context));
729 MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(inlineAsm);
731 SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
732 OwningPtr<MCAsmParser> Parser(createMCAsmParser(SrcMgr,
734 *_target->getMCAsmInfo()));
735 const Target &T = _target->getTarget();
736 OwningPtr<MCInstrInfo> MCII(T.createMCInstrInfo());
737 OwningPtr<MCSubtargetInfo>
738 STI(T.createMCSubtargetInfo(_target->getTargetTriple(),
739 _target->getTargetCPU(),
740 _target->getTargetFeatureString()));
741 OwningPtr<MCTargetAsmParser> TAP(T.createMCAsmParser(*STI, *Parser.get(), *MCII));
743 errMsg = "target " + std::string(T.getName()) +
744 " does not define AsmParser.";
748 Parser->setTargetParser(*TAP);
749 if (Parser->Run(false))
752 for (RecordStreamer::const_iterator i = Streamer->begin(),
753 e = Streamer->end(); i != e; ++i) {
754 StringRef Key = i->first();
755 RecordStreamer::State Value = i->second;
756 if (Value == RecordStreamer::DefinedGlobal)
757 addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_DEFAULT);
758 else if (Value == RecordStreamer::Defined)
759 addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_INTERNAL);
760 else if (Value == RecordStreamer::Global ||
761 Value == RecordStreamer::Used)
762 addAsmGlobalSymbolUndef(Key.data());
768 /// isDeclaration - Return 'true' if the global value is a declaration.
769 static bool isDeclaration(const GlobalValue &V) {
770 if (V.hasAvailableExternallyLinkage())
773 if (V.isMaterializable())
776 return V.isDeclaration();
779 /// parseSymbols - Parse the symbols from the module and model-level ASM and add
780 /// them to either the defined or undefined lists.
781 bool LTOModule::parseSymbols(std::string &errMsg) {
783 for (Module::iterator f = _module->begin(), e = _module->end(); f != e; ++f) {
784 if (isDeclaration(*f))
785 addPotentialUndefinedSymbol(f, true);
787 addDefinedFunctionSymbol(f);
791 for (Module::global_iterator v = _module->global_begin(),
792 e = _module->global_end(); v != e; ++v) {
793 if (isDeclaration(*v))
794 addPotentialUndefinedSymbol(v, false);
796 addDefinedDataSymbol(v);
800 if (addAsmGlobalSymbols(errMsg))
804 for (Module::alias_iterator a = _module->alias_begin(),
805 e = _module->alias_end(); a != e; ++a) {
806 if (isDeclaration(*a->getAliasedGlobal()))
807 // Is an alias to a declaration.
808 addPotentialUndefinedSymbol(a, false);
810 addDefinedDataSymbol(a);
813 // make symbols for all undefines
814 for (StringMap<NameAndAttributes>::iterator u =_undefines.begin(),
815 e = _undefines.end(); u != e; ++u) {
816 // If this symbol also has a definition, then don't make an undefine because
817 // it is a tentative definition.
818 if (_defines.count(u->getKey())) continue;
819 NameAndAttributes info = u->getValue();
820 _symbols.push_back(info);
826 /// parseMetadata - Parse metadata from the module
827 void LTOModule::parseMetadata() {
829 if (Value *Val = _module->getModuleFlag("Linker Options")) {
830 MDNode *LinkerOptions = cast<MDNode>(Val);
831 for (unsigned i = 0, e = LinkerOptions->getNumOperands(); i != e; ++i) {
832 MDNode *MDOptions = cast<MDNode>(LinkerOptions->getOperand(i));
833 for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) {
834 MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii));
835 StringRef Op = _linkeropt_strings.
836 GetOrCreateValue(MDOption->getString()).getKey();
837 StringRef DepLibName = _target->getTargetLowering()->
838 getObjFileLowering().getDepLibFromLinkerOpt(Op);
839 if (!DepLibName.empty())
840 _deplibs.push_back(DepLibName.data());
841 else if (!Op.empty())
842 _linkeropts.push_back(Op.data());
847 // Add other interesting metadata here.