From 5657e7b6677a1dce45b37abc3619ac887b3f7b68 Mon Sep 17 00:00:00 2001 From: Daniel Dunbar Date: Tue, 10 Aug 2010 23:46:39 +0000 Subject: [PATCH] LTOModule.cpp: Fix numerous style issues. llvm-svn: 110751 --- llvm/tools/lto/LTOModule.cpp | 855 +++++++++++++++++------------------ 1 file changed, 416 insertions(+), 439 deletions(-) diff --git a/llvm/tools/lto/LTOModule.cpp b/llvm/tools/lto/LTOModule.cpp index d386bacdfc93..49fa2c4b9100 100644 --- a/llvm/tools/lto/LTOModule.cpp +++ b/llvm/tools/lto/LTOModule.cpp @@ -4,10 +4,10 @@ // // 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 +// This file implements the Link Time Optimization library. This library is // intended to be used by linker to optimize code at link time. // //===----------------------------------------------------------------------===// @@ -36,495 +36,472 @@ 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 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::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) -{ - MemoryBuffer *buffer = MemoryBuffer::getFile(path); - if (buffer == NULL) - return false; - return isTargetMatch(buffer, triplePrefix); -} - -// takes ownership of buffer -bool LTOModule::isTargetMatch(MemoryBuffer* buffer, const char* triplePrefix) -{ - OwningPtr m(getLazyBitcodeModule(buffer, getGlobalContext())); - // on success, m owns buffer and both are deleted at end of this method - if (!m) { - delete buffer; - return false; - } - std::string actualTarget = m->getTargetTriple(); - return (strncmp(actualTarget.c_str(), triplePrefix, - strlen(triplePrefix)) == 0); -} - - -LTOModule::LTOModule(Module* m, TargetMachine* t) - : _module(m), _target(t), _symbolsParsed(false) -{ -} - -LTOModule* LTOModule::makeLTOModule(const char* path, - std::string& errMsg) -{ - OwningPtr buffer(MemoryBuffer::getFile(path, &errMsg)); - if (!buffer) - 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 buffer(makeBuffer(mem, length)); - if (!buffer) - return NULL; - return makeLTOModule(buffer.get(), errMsg); -} - -LTOModule* LTOModule::makeLTOModule(MemoryBuffer* buffer, - std::string& errMsg) -{ - InitializeAllTargets(); - - // parse bitcode buffer - OwningPtr 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); - return new LTOModule(m.take(), target); -} - - -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(c)) { - Constant* op = ce->getOperand(0); - if (GlobalVariable* gvn = dyn_cast(op)) { - Constant* cn = gvn->getInitializer(); - if (ConstantArray* ca = dyn_cast(cn)) { - if (ca->isCString()) { - name = ".objc_class_name_" + ca->getAsString(); - return true; - } - } - } - } +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); } -// parse i386/ppc ObjC class data structure -void LTOModule::addObjCClass(GlobalVariable* clgv) + +bool LTOModule::isBitcodeFileForTarget(const char *path, + const char *triplePrefix) { + MemoryBuffer *buffer = MemoryBuffer::getFile(path); + if (buffer == NULL) + return false; + return isTargetMatch(buffer, triplePrefix); +} + +// Takes ownership of buffer. +bool LTOModule::isTargetMatch(MemoryBuffer *buffer, const char *triplePrefix) { + OwningPtr m(getLazyBitcodeModule(buffer, getGlobalContext())); + // On success, m owns buffer and both are deleted at end of this method. + if (!m) { + delete buffer; + return false; + } + std::string actualTarget = m->getTargetTriple(); + return (strncmp(actualTarget.c_str(), triplePrefix, + strlen(triplePrefix)) == 0); +} + + +LTOModule::LTOModule(Module *m, TargetMachine *t) + : _module(m), _target(t), _symbolsParsed(false) { - if (ConstantStruct* c = dyn_cast(clgv->getInitializer())) { - // second slot in __OBJC,__class is pointer to superclass name - std::string superclassName; - if (objcClassNameFromExpression(c->getOperand(1), superclassName)) { - NameAndAttributes info; - if (_undefines.find(superclassName.c_str()) == _undefines.end()) { - const char* symbolName = ::strdup(superclassName.c_str()); - info.name = ::strdup(symbolName); - info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; - // string is owned by _undefines - _undefines[info.name] = info; - } - } - // third slot in __OBJC,__class is pointer to class name - std::string className; - if (objcClassNameFromExpression(c->getOperand(2), className)) { - const char* symbolName = ::strdup(className.c_str()); - NameAndAttributes info; - info.name = symbolName; - info.attributes = (lto_symbol_attributes) - (LTO_SYMBOL_PERMISSIONS_DATA | - LTO_SYMBOL_DEFINITION_REGULAR | - LTO_SYMBOL_SCOPE_DEFAULT); - _symbols.push_back(info); - _defines[info.name] = 1; - } +} + +LTOModule *LTOModule::makeLTOModule(const char *path, + std::string &errMsg) { + OwningPtr buffer(MemoryBuffer::getFile(path, &errMsg)); + if (!buffer) + 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 buffer(makeBuffer(mem, length)); + if (!buffer) + return NULL; + return makeLTOModule(buffer.get(), errMsg); +} + +LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer, + std::string &errMsg) { + InitializeAllTargets(); + + // parse bitcode buffer + OwningPtr 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); + return new LTOModule(m.take(), target); +} + + +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); + } } + } } - -// parse i386/ppc ObjC category data structure -void LTOModule::addObjCCategory(GlobalVariable* clgv) -{ - if (ConstantStruct* c = dyn_cast(clgv->getInitializer())) { - // second slot in __OBJC,__category is pointer to target class name - std::string targetclassName; - if (objcClassNameFromExpression(c->getOperand(1), targetclassName)) { - NameAndAttributes info; - if (_undefines.find(targetclassName.c_str()) == _undefines.end()) { - const char* symbolName = ::strdup(targetclassName.c_str()); - info.name = ::strdup(symbolName); - info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; - // string is owned by _undefines - _undefines[info.name] = info; - } +// Get string that data pointer points to. +bool LTOModule::objcClassNameFromExpression(Constant *c, std::string &name) { + if (ConstantExpr *ce = dyn_cast(c)) { + Constant *op = ce->getOperand(0); + if (GlobalVariable *gvn = dyn_cast(op)) { + Constant *cn = gvn->getInitializer(); + if (ConstantArray *ca = dyn_cast(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(clgv->getInitializer())) { + // second slot in __OBJC,__class is pointer to superclass name + std::string superclassName; + if (objcClassNameFromExpression(c->getOperand(1), superclassName)) { + NameAndAttributes info; + if (_undefines.find(superclassName.c_str()) == _undefines.end()) { + const char *symbolName = ::strdup(superclassName.c_str()); + info.name = ::strdup(symbolName); + info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; + // string is owned by _undefines + _undefines[info.name] = info; + } + } + // third slot in __OBJC,__class is pointer to class name + std::string className; + if (objcClassNameFromExpression(c->getOperand(2), className)) { + const char *symbolName = ::strdup(className.c_str()); + NameAndAttributes info; + info.name = symbolName; + info.attributes = (lto_symbol_attributes) + (LTO_SYMBOL_PERMISSIONS_DATA | + LTO_SYMBOL_DEFINITION_REGULAR | + LTO_SYMBOL_SCOPE_DEFAULT); + _symbols.push_back(info); + _defines[info.name] = 1; + } + } } -// parse i386/ppc ObjC class list data structure -void LTOModule::addObjCClassRef(GlobalVariable* clgv) -{ +// Parse i386/ppc ObjC category data structure. +void LTOModule::addObjCCategory(GlobalVariable *clgv) { + if (ConstantStruct *c = dyn_cast(clgv->getInitializer())) { + // second slot in __OBJC,__category is pointer to target class name std::string targetclassName; - if (objcClassNameFromExpression(clgv->getInitializer(), targetclassName)) { - NameAndAttributes info; - if (_undefines.find(targetclassName.c_str()) == _undefines.end()) { - const char* symbolName = ::strdup(targetclassName.c_str()); - info.name = ::strdup(symbolName); - info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; - // string is owned by _undefines - _undefines[info.name] = info; - } + if (objcClassNameFromExpression(c->getOperand(1), targetclassName)) { + NameAndAttributes info; + if (_undefines.find(targetclassName.c_str()) == _undefines.end()) { + const char *symbolName = ::strdup(targetclassName.c_str()); + info.name = ::strdup(symbolName); + info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; + // string is owned by _undefines + _undefines[info.name] = 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(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(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(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; - - // string is owned by _defines - const char* symbolName = ::strdup(mangler.getNameWithPrefix(def).c_str()); - - // 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(def); - if (gv && gv->isConstant()) - attr |= LTO_SYMBOL_PERMISSIONS_RODATA; - else - attr |= LTO_SYMBOL_PERMISSIONS_DATA; - } - - // set definition part - if (def->hasWeakLinkage() || def->hasLinkOnceLinkage()) { - 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()) - attr |= LTO_SYMBOL_SCOPE_DEFAULT; - else - attr |= LTO_SYMBOL_SCOPE_INTERNAL; - - // add to table of symbols +// Parse i386/ppc ObjC class list data structure. +void LTOModule::addObjCClassRef(GlobalVariable *clgv) { + std::string targetclassName; + if (objcClassNameFromExpression(clgv->getInitializer(), targetclassName)) { NameAndAttributes info; - info.name = symbolName; - info.attributes = (lto_symbol_attributes)attr; - _symbols.push_back(info); - _defines[info.name] = 1; + if (_undefines.find(targetclassName.c_str()) == _undefines.end()) { + const char *symbolName = ::strdup(targetclassName.c_str()); + info.name = ::strdup(symbolName); + info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; + // string is owned by _undefines + _undefines[info.name] = 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(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(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(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; + + // string is owned by _defines + const char *symbolName = ::strdup(mangler.getNameWithPrefix(def).c_str()); + + // 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(def); + if (gv && gv->isConstant()) + attr |= LTO_SYMBOL_PERMISSIONS_RODATA; + else + attr |= LTO_SYMBOL_PERMISSIONS_DATA; + } + + // set definition part + if (def->hasWeakLinkage() || def->hasLinkOnceLinkage()) { + 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()) + attr |= LTO_SYMBOL_SCOPE_DEFAULT; + else + attr |= LTO_SYMBOL_SCOPE_INTERNAL; + + // add to table of symbols + NameAndAttributes info; + info.name = symbolName; + info.attributes = (lto_symbol_attributes)attr; + _symbols.push_back(info); + _defines[info.name] = 1; } void LTOModule::addAsmGlobalSymbol(const char *name) { - // only add new define if not already defined - if (_defines.count(name) == 0) - return; - - // string is owned by _defines - const char *symbolName = ::strdup(name); - uint32_t attr = LTO_SYMBOL_DEFINITION_REGULAR; - attr |= LTO_SYMBOL_SCOPE_DEFAULT; - NameAndAttributes info; - info.name = symbolName; - info.attributes = (lto_symbol_attributes)attr; - _symbols.push_back(info); - _defines[info.name] = 1; + // only add new define if not already defined + if (_defines.count(name) == 0) + return; + + // string is owned by _defines + const char *symbolName = ::strdup(name); + uint32_t attr = LTO_SYMBOL_DEFINITION_REGULAR; + attr |= LTO_SYMBOL_SCOPE_DEFAULT; + NameAndAttributes info; + info.name = symbolName; + info.attributes = (lto_symbol_attributes)attr; + _symbols.push_back(info); + _defines[info.name] = 1; } -void LTOModule::addPotentialUndefinedSymbol(GlobalValue* decl, Mangler &mangler) -{ - // ignore all llvm.* symbols - if (decl->getName().startswith("llvm.")) - return; +void LTOModule::addPotentialUndefinedSymbol(GlobalValue *decl, + Mangler &mangler) { + // ignore all llvm.* symbols + if (decl->getName().startswith("llvm.")) + return; - // ignore all aliases - if (isa(decl)) - return; + // ignore all aliases + if (isa(decl)) + return; - std::string name = mangler.getNameWithPrefix(decl); + std::string name = mangler.getNameWithPrefix(decl); - // we already have the symbol - if (_undefines.find(name) != _undefines.end()) - return; + // we already have the symbol + if (_undefines.find(name) != _undefines.end()) + return; - NameAndAttributes info; - // string is owned by _undefines - info.name = ::strdup(name.c_str()); - if (decl->hasExternalWeakLinkage()) - info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF; - else - info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; - _undefines[name] = info; + NameAndAttributes info; + // string is owned by _undefines + info.name = ::strdup(name.c_str()); + if (decl->hasExternalWeakLinkage()) + info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF; + else + info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED; + _undefines[name] = info; } // Find external symbols referenced by VALUE. This is a recursive function. -void LTOModule::findExternalRefs(Value* value, Mangler &mangler) { +void LTOModule::findExternalRefs(Value *value, Mangler &mangler) { + if (GlobalValue *gv = dyn_cast(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; + } - if (GlobalValue* gv = dyn_cast(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(value)) { + // Handle ConstantExpr, ConstantStruct, ConstantArry etc. + for (unsigned i = 0, e = c->getNumOperands(); i != e; ++i) + findExternalRefs(c->getOperand(i), mangler); + } +} + +void LTOModule::lazyParseSymbols() { + if (!_symbolsParsed) { + _symbolsParsed = true; + + // Use mangler to add GlobalPrefix to names to match linker names. + MCContext Context(*_target->getMCAsmInfo()); + 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); } - // GlobalValue, even with InternalLinkage type, may have operands with - // ExternalLinkage type. Do not ignore these operands. - if (Constant* c = dyn_cast(value)) { - // Handle ConstantExpr, ConstantStruct, ConstantArry etc. - for (unsigned i = 0, e = c->getNumOperands(); i != e; ++i) - findExternalRefs(c->getOperand(i), 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); } -} -void LTOModule::lazyParseSymbols() -{ - if (!_symbolsParsed) { - _symbolsParsed = true; - - // Use mangler to add GlobalPrefix to names to match linker names. - MCContext Context(*_target->getMCAsmInfo()); - Mangler mangler(Context, *_target->getTargetData()); + // add asm globals + const std::string &inlineAsm = _module->getModuleInlineAsm(); + const std::string glbl = ".globl"; + std::string asmSymbolName; + std::string::size_type pos = inlineAsm.find(glbl, 0); + while (pos != std::string::npos) { + // eat .globl + pos = pos + 6; - // 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); - } + // skip white space between .globl and symbol name + std::string::size_type pbegin = inlineAsm.find_first_not_of(' ', pos); + if (pbegin == std::string::npos) + break; - // add asm globals - const std::string &inlineAsm = _module->getModuleInlineAsm(); - const std::string glbl = ".globl"; - std::string asmSymbolName; - std::string::size_type pos = inlineAsm.find(glbl, 0); - while (pos != std::string::npos) { - // eat .globl - pos = pos + 6; + // find end-of-line + std::string::size_type pend = inlineAsm.find_first_of('\n', pbegin); + if (pend == std::string::npos) + break; - // skip white space between .globl and symbol name - std::string::size_type pbegin = inlineAsm.find_first_not_of(' ', pos); - if (pbegin == std::string::npos) - break; + asmSymbolName.assign(inlineAsm, pbegin, pend - pbegin); + addAsmGlobalSymbol(asmSymbolName.c_str()); - // find end-of-line - std::string::size_type pend = inlineAsm.find_first_of('\n', pbegin); - if (pend == std::string::npos) - break; + // search next .globl + pos = inlineAsm.find(glbl, pend); + } - asmSymbolName.assign(inlineAsm, pbegin, pend - pbegin); - addAsmGlobalSymbol(asmSymbolName.c_str()); - - // search next .globl - pos = inlineAsm.find(glbl, pend); - } - - // make symbols for all undefines - for (StringMap::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); - } - } - } + // make symbols for all undefines + for (StringMap::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); + } + } + } } -uint32_t LTOModule::getSymbolCount() -{ - lazyParseSymbols(); - return _symbols.size(); +uint32_t LTOModule::getSymbolCount() { + lazyParseSymbols(); + return _symbols.size(); } -lto_symbol_attributes LTOModule::getSymbolAttributes(uint32_t index) -{ - lazyParseSymbols(); - if (index < _symbols.size()) - return _symbols[index].attributes; - else - return lto_symbol_attributes(0); +lto_symbol_attributes LTOModule::getSymbolAttributes(uint32_t index) { + lazyParseSymbols(); + if (index < _symbols.size()) + return _symbols[index].attributes; + else + return lto_symbol_attributes(0); } -const char* LTOModule::getSymbolName(uint32_t index) -{ - lazyParseSymbols(); - if (index < _symbols.size()) - return _symbols[index].name; - else - return NULL; +const char *LTOModule::getSymbolName(uint32_t index) { + lazyParseSymbols(); + if (index < _symbols.size()) + return _symbols[index].name; + else + return NULL; }