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.take(), 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.take(), 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.take(), options, errMsg);
129 LTOModule *LTOModule::makeLTOModule(const void *mem, size_t length,
130 TargetOptions options,
131 std::string &errMsg) {
132 OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length));
135 return makeLTOModule(buffer.take(), 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.take(), target);
179 if (Ret->parseSymbols(errMsg)) {
184 Ret->parseMetadata();
189 /// makeBuffer - Create a MemoryBuffer from a memory range.
190 MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length) {
191 const char *startPtr = (const char*)mem;
192 return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), "", false);
195 /// objcClassNameFromExpression - Get string that the data pointer points to.
197 LTOModule::objcClassNameFromExpression(const Constant *c, std::string &name) {
198 if (const ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) {
199 Constant *op = ce->getOperand(0);
200 if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) {
201 Constant *cn = gvn->getInitializer();
202 if (ConstantDataArray *ca = dyn_cast<ConstantDataArray>(cn)) {
203 if (ca->isCString()) {
204 name = ".objc_class_name_" + ca->getAsCString().str();
213 /// addObjCClass - Parse i386/ppc ObjC class data structure.
214 void LTOModule::addObjCClass(const GlobalVariable *clgv) {
215 const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
218 // second slot in __OBJC,__class is pointer to superclass name
219 std::string superclassName;
220 if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
221 NameAndAttributes info;
222 StringMap<NameAndAttributes>::value_type &entry =
223 _undefines.GetOrCreateValue(superclassName);
224 if (!entry.getValue().name) {
225 const char *symbolName = entry.getKey().data();
226 info.name = symbolName;
227 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
228 info.isFunction = false;
230 entry.setValue(info);
234 // third slot in __OBJC,__class is pointer to class name
235 std::string className;
236 if (objcClassNameFromExpression(c->getOperand(2), className)) {
237 StringSet::value_type &entry = _defines.GetOrCreateValue(className);
240 NameAndAttributes info;
241 info.name = entry.getKey().data();
242 info.attributes = LTO_SYMBOL_PERMISSIONS_DATA |
243 LTO_SYMBOL_DEFINITION_REGULAR | LTO_SYMBOL_SCOPE_DEFAULT;
244 info.isFunction = false;
246 _symbols.push_back(info);
250 /// addObjCCategory - Parse i386/ppc ObjC category data structure.
251 void LTOModule::addObjCCategory(const GlobalVariable *clgv) {
252 const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
255 // second slot in __OBJC,__category is pointer to target class name
256 std::string targetclassName;
257 if (!objcClassNameFromExpression(c->getOperand(1), targetclassName))
260 NameAndAttributes info;
261 StringMap<NameAndAttributes>::value_type &entry =
262 _undefines.GetOrCreateValue(targetclassName);
264 if (entry.getValue().name)
267 const char *symbolName = entry.getKey().data();
268 info.name = symbolName;
269 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
270 info.isFunction = false;
272 entry.setValue(info);
275 /// addObjCClassRef - Parse i386/ppc ObjC class list data structure.
276 void LTOModule::addObjCClassRef(const GlobalVariable *clgv) {
277 std::string targetclassName;
278 if (!objcClassNameFromExpression(clgv->getInitializer(), targetclassName))
281 NameAndAttributes info;
282 StringMap<NameAndAttributes>::value_type &entry =
283 _undefines.GetOrCreateValue(targetclassName);
284 if (entry.getValue().name)
287 const char *symbolName = entry.getKey().data();
288 info.name = symbolName;
289 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
290 info.isFunction = false;
292 entry.setValue(info);
295 /// addDefinedDataSymbol - Add a data symbol as defined to the list.
296 void LTOModule::addDefinedDataSymbol(const GlobalValue *v) {
297 // Add to list of defined symbols.
298 addDefinedSymbol(v, false);
300 if (!v->hasSection() /* || !isTargetDarwin */)
303 // Special case i386/ppc ObjC data structures in magic sections:
304 // The issue is that the old ObjC object format did some strange
305 // contortions to avoid real linker symbols. For instance, the
306 // ObjC class data structure is allocated statically in the executable
307 // that defines that class. That data structures contains a pointer to
308 // its superclass. But instead of just initializing that part of the
309 // struct to the address of its superclass, and letting the static and
310 // dynamic linkers do the rest, the runtime works by having that field
311 // instead point to a C-string that is the name of the superclass.
312 // At runtime the objc initialization updates that pointer and sets
313 // it to point to the actual super class. As far as the linker
314 // knows it is just a pointer to a string. But then someone wanted the
315 // linker to issue errors at build time if the superclass was not found.
316 // So they figured out a way in mach-o object format to use an absolute
317 // symbols (.objc_class_name_Foo = 0) and a floating reference
318 // (.reference .objc_class_name_Bar) to cause the linker into erroring when
319 // a class was missing.
320 // The following synthesizes the implicit .objc_* symbols for the linker
321 // from the ObjC data structures generated by the front end.
323 // special case if this data blob is an ObjC class definition
324 if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) {
325 if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
330 // special case if this data blob is an ObjC category definition
331 else if (v->getSection().compare(0, 18, "__OBJC,__category,") == 0) {
332 if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
337 // special case if this data blob is the list of referenced classes
338 else if (v->getSection().compare(0, 18, "__OBJC,__cls_refs,") == 0) {
339 if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
345 /// addDefinedFunctionSymbol - Add a function symbol as defined to the list.
346 void LTOModule::addDefinedFunctionSymbol(const Function *f) {
347 // add to list of defined symbols
348 addDefinedSymbol(f, true);
351 static bool canBeHidden(const GlobalValue *GV) {
352 GlobalValue::LinkageTypes L = GV->getLinkage();
354 if (L != GlobalValue::LinkOnceODRLinkage)
357 if (GV->hasUnnamedAddr())
361 if (GlobalStatus::analyzeGlobal(GV, GS))
364 return !GS.IsCompared;
367 /// addDefinedSymbol - Add a defined symbol to the list.
368 void LTOModule::addDefinedSymbol(const GlobalValue *def, bool isFunction) {
369 // ignore all llvm.* symbols
370 if (def->getName().startswith("llvm."))
373 // string is owned by _defines
374 SmallString<64> Buffer;
375 _mangler.getNameWithPrefix(Buffer, def);
377 // set alignment part log2() can have rounding errors
378 uint32_t align = def->getAlignment();
379 uint32_t attr = align ? countTrailingZeros(def->getAlignment()) : 0;
381 // set permissions part
383 attr |= LTO_SYMBOL_PERMISSIONS_CODE;
385 const GlobalVariable *gv = dyn_cast<GlobalVariable>(def);
386 if (gv && gv->isConstant())
387 attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
389 attr |= LTO_SYMBOL_PERMISSIONS_DATA;
392 // set definition part
393 if (def->hasWeakLinkage() || def->hasLinkOnceLinkage() ||
394 def->hasLinkerPrivateWeakLinkage())
395 attr |= LTO_SYMBOL_DEFINITION_WEAK;
396 else if (def->hasCommonLinkage())
397 attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
399 attr |= LTO_SYMBOL_DEFINITION_REGULAR;
402 if (def->hasHiddenVisibility())
403 attr |= LTO_SYMBOL_SCOPE_HIDDEN;
404 else if (def->hasProtectedVisibility())
405 attr |= LTO_SYMBOL_SCOPE_PROTECTED;
406 else if (canBeHidden(def))
407 attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
408 else if (def->hasExternalLinkage() || def->hasWeakLinkage() ||
409 def->hasLinkOnceLinkage() || def->hasCommonLinkage() ||
410 def->hasLinkerPrivateWeakLinkage())
411 attr |= LTO_SYMBOL_SCOPE_DEFAULT;
413 attr |= LTO_SYMBOL_SCOPE_INTERNAL;
415 StringSet::value_type &entry = _defines.GetOrCreateValue(Buffer);
418 // fill information structure
419 NameAndAttributes info;
420 StringRef Name = entry.getKey();
421 info.name = Name.data();
422 assert(info.name[Name.size()] == '\0');
423 info.attributes = attr;
424 info.isFunction = isFunction;
427 // add to table of symbols
428 _symbols.push_back(info);
431 /// addAsmGlobalSymbol - Add a global symbol from module-level ASM to the
433 void LTOModule::addAsmGlobalSymbol(const char *name,
434 lto_symbol_attributes scope) {
435 StringSet::value_type &entry = _defines.GetOrCreateValue(name);
437 // only add new define if not already defined
438 if (entry.getValue())
443 NameAndAttributes &info = _undefines[entry.getKey().data()];
445 if (info.symbol == 0) {
446 // FIXME: This is trying to take care of module ASM like this:
448 // module asm ".zerofill __FOO, __foo, _bar_baz_qux, 0"
450 // but is gross and its mother dresses it funny. Have the ASM parser give us
451 // more details for this type of situation so that we're not guessing so
454 // fill information structure
455 info.name = entry.getKey().data();
457 LTO_SYMBOL_PERMISSIONS_DATA | LTO_SYMBOL_DEFINITION_REGULAR | scope;
458 info.isFunction = false;
461 // add to table of symbols
462 _symbols.push_back(info);
467 addDefinedFunctionSymbol(cast<Function>(info.symbol));
469 addDefinedDataSymbol(info.symbol);
471 _symbols.back().attributes &= ~LTO_SYMBOL_SCOPE_MASK;
472 _symbols.back().attributes |= scope;
475 /// addAsmGlobalSymbolUndef - Add a global symbol from module-level ASM to the
477 void LTOModule::addAsmGlobalSymbolUndef(const char *name) {
478 StringMap<NameAndAttributes>::value_type &entry =
479 _undefines.GetOrCreateValue(name);
481 _asm_undefines.push_back(entry.getKey().data());
483 // we already have the symbol
484 if (entry.getValue().name)
487 uint32_t attr = LTO_SYMBOL_DEFINITION_UNDEFINED;;
488 attr |= LTO_SYMBOL_SCOPE_DEFAULT;
489 NameAndAttributes info;
490 info.name = entry.getKey().data();
491 info.attributes = attr;
492 info.isFunction = false;
495 entry.setValue(info);
498 /// addPotentialUndefinedSymbol - Add a symbol which isn't defined just yet to a
499 /// list to be resolved later.
501 LTOModule::addPotentialUndefinedSymbol(const GlobalValue *decl, bool isFunc) {
502 // ignore all llvm.* symbols
503 if (decl->getName().startswith("llvm."))
506 // ignore all aliases
507 if (isa<GlobalAlias>(decl))
510 SmallString<64> name;
511 _mangler.getNameWithPrefix(name, decl);
513 StringMap<NameAndAttributes>::value_type &entry =
514 _undefines.GetOrCreateValue(name);
516 // we already have the symbol
517 if (entry.getValue().name)
520 NameAndAttributes info;
522 info.name = entry.getKey().data();
524 if (decl->hasExternalWeakLinkage())
525 info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
527 info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
529 info.isFunction = isFunc;
532 entry.setValue(info);
537 class RecordStreamer : public MCStreamer {
539 enum State { NeverSeen, Global, Defined, DefinedGlobal, Used };
542 StringMap<State> Symbols;
544 void markDefined(const MCSymbol &Symbol) {
545 State &S = Symbols[Symbol.getName()];
558 void markGlobal(const MCSymbol &Symbol) {
559 State &S = Symbols[Symbol.getName()];
573 void markUsed(const MCSymbol &Symbol) {
574 State &S = Symbols[Symbol.getName()];
588 // FIXME: mostly copied for the obj streamer.
589 void AddValueSymbols(const MCExpr *Value) {
590 switch (Value->getKind()) {
592 // FIXME: What should we do in here?
595 case MCExpr::Constant:
598 case MCExpr::Binary: {
599 const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
600 AddValueSymbols(BE->getLHS());
601 AddValueSymbols(BE->getRHS());
605 case MCExpr::SymbolRef:
606 markUsed(cast<MCSymbolRefExpr>(Value)->getSymbol());
610 AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
616 typedef StringMap<State>::const_iterator const_iterator;
618 const_iterator begin() {
619 return Symbols.begin();
622 const_iterator end() {
623 return Symbols.end();
626 RecordStreamer(MCContext &Context) : MCStreamer(Context, 0) {}
628 virtual void EmitInstruction(const MCInst &Inst) {
630 for (unsigned i = Inst.getNumOperands(); i--; )
631 if (Inst.getOperand(i).isExpr())
632 AddValueSymbols(Inst.getOperand(i).getExpr());
634 virtual void EmitLabel(MCSymbol *Symbol) {
635 Symbol->setSection(*getCurrentSection().first);
636 markDefined(*Symbol);
638 virtual void EmitDebugLabel(MCSymbol *Symbol) {
641 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
642 // FIXME: should we handle aliases?
643 markDefined(*Symbol);
645 virtual bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) {
646 if (Attribute == MCSA_Global)
650 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
651 uint64_t Size , unsigned ByteAlignment) {
652 markDefined(*Symbol);
654 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
655 unsigned ByteAlignment) {
656 markDefined(*Symbol);
659 virtual void EmitBundleAlignMode(unsigned AlignPow2) {}
660 virtual void EmitBundleLock(bool AlignToEnd) {}
661 virtual void EmitBundleUnlock() {}
664 virtual void ChangeSection(const MCSection *Section,
665 const MCExpr *Subsection) {}
666 virtual void InitSections() {
667 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
669 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
670 virtual void EmitThumbFunc(MCSymbol *Func) {}
671 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
672 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
673 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
674 virtual void EmitCOFFSymbolStorageClass(int StorageClass) {}
675 virtual void EmitCOFFSymbolType(int Type) {}
676 virtual void EndCOFFSymbolDef() {}
677 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
678 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
679 unsigned ByteAlignment) {}
680 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
681 uint64_t Size, unsigned ByteAlignment) {}
682 virtual void EmitBytes(StringRef Data) {}
683 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size) {}
684 virtual void EmitULEB128Value(const MCExpr *Value) {}
685 virtual void EmitSLEB128Value(const MCExpr *Value) {}
686 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
688 unsigned MaxBytesToEmit) {}
689 virtual void EmitCodeAlignment(unsigned ByteAlignment,
690 unsigned MaxBytesToEmit) {}
691 virtual bool EmitValueToOffset(const MCExpr *Offset,
692 unsigned char Value ) { return false; }
693 virtual void EmitFileDirective(StringRef Filename) {}
694 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
695 const MCSymbol *LastLabel,
696 const MCSymbol *Label,
697 unsigned PointerSize) {}
698 virtual void FinishImpl() {}
699 virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
700 RecordProcEnd(Frame);
703 } // end anonymous namespace
705 /// addAsmGlobalSymbols - Add global symbols from module-level ASM to the
706 /// defined or undefined lists.
707 bool LTOModule::addAsmGlobalSymbols(std::string &errMsg) {
708 const std::string &inlineAsm = _module->getModuleInlineAsm();
709 if (inlineAsm.empty())
712 OwningPtr<RecordStreamer> Streamer(new RecordStreamer(_context));
713 MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(inlineAsm);
715 SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
716 OwningPtr<MCAsmParser> Parser(createMCAsmParser(SrcMgr,
718 *_target->getMCAsmInfo()));
719 const Target &T = _target->getTarget();
720 OwningPtr<MCInstrInfo> MCII(T.createMCInstrInfo());
721 OwningPtr<MCSubtargetInfo>
722 STI(T.createMCSubtargetInfo(_target->getTargetTriple(),
723 _target->getTargetCPU(),
724 _target->getTargetFeatureString()));
725 OwningPtr<MCTargetAsmParser> TAP(T.createMCAsmParser(*STI, *Parser.get(), *MCII));
727 errMsg = "target " + std::string(T.getName()) +
728 " does not define AsmParser.";
732 Parser->setTargetParser(*TAP);
733 if (Parser->Run(false))
736 for (RecordStreamer::const_iterator i = Streamer->begin(),
737 e = Streamer->end(); i != e; ++i) {
738 StringRef Key = i->first();
739 RecordStreamer::State Value = i->second;
740 if (Value == RecordStreamer::DefinedGlobal)
741 addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_DEFAULT);
742 else if (Value == RecordStreamer::Defined)
743 addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_INTERNAL);
744 else if (Value == RecordStreamer::Global ||
745 Value == RecordStreamer::Used)
746 addAsmGlobalSymbolUndef(Key.data());
752 /// isDeclaration - Return 'true' if the global value is a declaration.
753 static bool isDeclaration(const GlobalValue &V) {
754 if (V.hasAvailableExternallyLinkage())
757 if (V.isMaterializable())
760 return V.isDeclaration();
763 /// parseSymbols - Parse the symbols from the module and model-level ASM and add
764 /// them to either the defined or undefined lists.
765 bool LTOModule::parseSymbols(std::string &errMsg) {
767 for (Module::iterator f = _module->begin(), e = _module->end(); f != e; ++f) {
768 if (isDeclaration(*f))
769 addPotentialUndefinedSymbol(f, true);
771 addDefinedFunctionSymbol(f);
775 for (Module::global_iterator v = _module->global_begin(),
776 e = _module->global_end(); v != e; ++v) {
777 if (isDeclaration(*v))
778 addPotentialUndefinedSymbol(v, false);
780 addDefinedDataSymbol(v);
784 if (addAsmGlobalSymbols(errMsg))
788 for (Module::alias_iterator a = _module->alias_begin(),
789 e = _module->alias_end(); a != e; ++a) {
790 if (isDeclaration(*a->getAliasedGlobal()))
791 // Is an alias to a declaration.
792 addPotentialUndefinedSymbol(a, false);
794 addDefinedDataSymbol(a);
797 // make symbols for all undefines
798 for (StringMap<NameAndAttributes>::iterator u =_undefines.begin(),
799 e = _undefines.end(); u != e; ++u) {
800 // If this symbol also has a definition, then don't make an undefine because
801 // it is a tentative definition.
802 if (_defines.count(u->getKey())) continue;
803 NameAndAttributes info = u->getValue();
804 _symbols.push_back(info);
810 /// parseMetadata - Parse metadata from the module
811 void LTOModule::parseMetadata() {
813 if (Value *Val = _module->getModuleFlag("Linker Options")) {
814 MDNode *LinkerOptions = cast<MDNode>(Val);
815 for (unsigned i = 0, e = LinkerOptions->getNumOperands(); i != e; ++i) {
816 MDNode *MDOptions = cast<MDNode>(LinkerOptions->getOperand(i));
817 for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) {
818 MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii));
819 StringRef Op = _linkeropt_strings.
820 GetOrCreateValue(MDOption->getString()).getKey();
821 StringRef DepLibName = _target->getTargetLowering()->
822 getObjFileLowering().getDepLibFromLinkerOpt(Op);
823 if (!DepLibName.empty())
824 _deplibs.push_back(DepLibName.data());
825 else if (!Op.empty())
826 _linkeropts.push_back(Op.data());
831 // Add other interesting metadata here.