-//===-LTOModule.cpp - LLVM Link Time Optimizer ----------------------------===//
+//===-- 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
+// This file implements the Link Time Optimization library. This library is
// intended to be used by linker to optimize code at link time.
//
//===----------------------------------------------------------------------===//
#include "llvm/Constants.h"
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
-#include "llvm/ModuleProvider.h"
#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/Triple.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Support/SystemUtils.h"
-#include "llvm/Support/Mangler.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/MathExtras.h"
-#include "llvm/System/Path.h"
-#include "llvm/System/Process.h"
-#include "llvm/Target/SubtargetFeature.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/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/MCSubtargetInfo.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/SubtargetFeature.h"
+#include "llvm/Target/TargetAsmParser.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetMachineRegistry.h"
-#include "llvm/Target/TargetAsmInfo.h"
-
-#include <fstream>
+#include "llvm/Target/TargetRegisterInfo.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 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 == NULL )
- return false;
- return isTargetMatch(buffer, triplePrefix);
+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);
+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)
-{
- OwningPtr<ModuleProvider> mp(getBitcodeModuleProvider(buffer,
- getGlobalContext()));
- // on success, mp owns buffer and both are deleted at end of this method
- if ( !mp ) {
- delete buffer;
- return false;
- }
- std::string actualTarget = mp->getModule()->getTargetTriple();
- return ( strncmp(actualTarget.c_str(), triplePrefix,
- strlen(triplePrefix)) == 0);
+// 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), _symbolsParsed(false)
+LTOModule::LTOModule(Module *m, TargetMachine *t)
+ : _module(m), _target(t)
{
}
-LTOModule* LTOModule::makeLTOModule(const char* path,
- std::string& errMsg)
-{
- OwningPtr<MemoryBuffer> buffer(MemoryBuffer::getFile(path, &errMsg));
- if ( !buffer )
- return NULL;
- return makeLTOModule(buffer.get(), errMsg);
+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.take(), 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(startPtr, endPtr);
- else
- return MemoryBuffer::getMemBuffer(startPtr, endPtr);
+LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
+ size_t size,
+ std::string &errMsg) {
+ return makeLTOModule(fd, path, size, size, 0, errMsg);
}
+LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
+ size_t file_size,
+ size_t map_size,
+ off_t offset,
+ std::string &errMsg) {
+ OwningPtr<MemoryBuffer> buffer;
+ if (error_code ec = MemoryBuffer::getOpenFile(fd, path, buffer, file_size,
+ map_size, offset, false)) {
+ errMsg = ec.message();
+ return NULL;
+ }
+ return makeLTOModule(buffer.take(), errMsg);
+}
-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);
-}
-
-/// getFeatureString - Return a string listing the features associated with the
-/// target triple.
-///
-/// FIXME: This is an inelegant way of specifying the features of a
-/// subtarget. It would be better if we could encode this information into the
-/// IR. See <rdar://5972456>.
-std::string getFeatureString(const char *TargetTriple) {
- SubtargetFeatures Features;
+/// makeBuffer - Create a MemoryBuffer from a memory range.
+MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length) {
+ const char *startPtr = (char*)mem;
+ return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), "", false);
+}
- if (strncmp(TargetTriple, "powerpc-apple-", 14) == 0) {
- Features.AddFeature("altivec", true);
- } else if (strncmp(TargetTriple, "powerpc64-apple-", 16) == 0) {
- Features.AddFeature("64bit", true);
- Features.AddFeature("altivec", true);
- }
- return Features.getString();
+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.take(), errMsg);
}
-LTOModule* LTOModule::makeLTOModule(MemoryBuffer* buffer,
- std::string& errMsg)
-{
- // parse bitcode buffer
- OwningPtr<Module> m(ParseBitcodeFile(buffer, getGlobalContext(), &errMsg));
- if ( !m )
- return NULL;
- // find machine architecture for this module
- const Target* march =
- TargetRegistry::getClosestStaticTargetForModule(*m, errMsg);
+LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer,
+ std::string &errMsg) {
+ static bool Initialized = false;
+ if (!Initialized) {
+ InitializeAllTargets();
+ InitializeAllTargetMCs();
+ InitializeAllAsmParsers();
+ Initialized = true;
+ }
- if ( march == NULL )
- return NULL;
+ // parse bitcode buffer
+ OwningPtr<Module> m(getLazyBitcodeModule(buffer, getGlobalContext(),
+ &errMsg));
+ if (!m) {
+ delete buffer;
+ return NULL;
+ }
+
+ std::string Triple = m->getTargetTriple();
+ if (Triple.empty())
+ Triple = sys::getHostTriple();
- // construct LTModule, hand over ownership of module and target
- std::string FeatureStr = getFeatureString(m->getTargetTriple().c_str());
- TargetMachine* target = march->createTargetMachine(*m, FeatureStr);
- return new LTOModule(m.take(), target);
+ // find machine architecture for this module
+ const Target *march = TargetRegistry::lookupTarget(Triple, errMsg);
+ if (!march)
+ return NULL;
+
+ // construct LTOModule, hand over ownership of module and target
+ SubtargetFeatures Features;
+ Features.getDefaultSubtargetFeatures(llvm::Triple(Triple));
+ std::string FeatureStr = Features.getString();
+ std::string CPU;
+ TargetMachine *target = march->createTargetMachine(Triple, CPU, 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();
+const char *LTOModule::getTargetTriple() {
+ return _module->getTargetTriple().c_str();
}
-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);
- }
- }
- }
+void LTOModule::setTargetTriple(const char *triple) {
+ _module->setTargetTriple(triple);
}
-// 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;
+void LTOModule::addDefinedFunctionSymbol(Function *f, Mangler &mangler) {
+ // add to list of defined symbols
+ addDefinedSymbol(f, mangler, true);
}
-// 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;
- 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;
- }
+// 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->getAsCString();
+ return true;
}
- // 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;
- }
+ }
}
+ }
+ return false;
}
-
-// 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;
- 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;
- }
- }
+// 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);
+ 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);
+ 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 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<ConstantStruct>(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;
+ StringMap<NameAndAttributes>::value_type &entry =
+ _undefines.GetOrCreateValue(targetclassName);
-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);
- }
- }
- }
+ if (entry.getValue().name)
+ return;
- // add external symbols referenced by this data.
- for (unsigned count = 0, total = v->getNumOperands();
- count != total; ++count) {
- findExternalRefs(v->getOperand(count), mangler);
+ const char *symbolName = entry.getKey().data();
+ info.name = symbolName;
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ entry.setValue(info);
}
+ }
}
-void LTOModule::addDefinedSymbol(GlobalValue* def, Mangler &mangler,
- bool isFunction)
-{
- // ignore all llvm.* symbols
- if ( strncmp(def->getNameStart(), "llvm.", 5) == 0 )
- return;
+// Parse i386/ppc ObjC class list data structure.
+void LTOModule::addObjCClassRef(GlobalVariable *clgv) {
+ std::string targetclassName;
+ if (objcClassNameFromExpression(clgv->getInitializer(), targetclassName)) {
+ NameAndAttributes info;
- // string is owned by _defines
- const char* symbolName = ::strdup(mangler.getMangledName(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<GlobalVariable>(def);
- if ( (gv != NULL) && 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;
+ StringMap<NameAndAttributes>::value_type &entry =
+ _undefines.GetOrCreateValue(targetclassName);
+ 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);
+ }
}
- else if ( def->hasCommonLinkage()) {
- attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
+
+ // 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);
+ }
}
- else {
- attr |= LTO_SYMBOL_DEFINITION_REGULAR;
+
+ // 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);
+ }
}
-
- // 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;
+ }
+}
+
+
+void LTOModule::addDefinedSymbol(GlobalValue *def, Mangler &mangler,
+ bool isFunction) {
+ // ignore all llvm.* symbols
+ if (def->getName().startswith("llvm."))
+ 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_SCOPE_INTERNAL;
+ attr |= LTO_SYMBOL_PERMISSIONS_DATA;
+ }
- // add to table of symbols
- NameAndAttributes info;
- info.name = symbolName;
- info.attributes = (lto_symbol_attributes)attr;
- _symbols.push_back(info);
- _defines[info.name] = 1;
+ // 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);
+ 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) {
- // only add new define if not already defined
- if ( _defines.count(name, &name[strlen(name)+1]) == 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::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::addPotentialUndefinedSymbol(GlobalValue* decl, Mangler &mangler)
-{
- // ignore all llvm.* symbols
- if ( strncmp(decl->getNameStart(), "llvm.", 5) == 0 )
- return;
+void LTOModule::addAsmGlobalSymbolUndef(const char *name) {
+ StringMap<NameAndAttributes>::value_type &entry =
+ _undefines.GetOrCreateValue(name);
- // ignore all aliases
- if (isa<GlobalAlias>(decl))
- return;
+ _asm_undefines.push_back(entry.getKey().data());
- const char* name = mangler.getMangledName(decl).c_str();
+ // we already have the symbol
+ if (entry.getValue().name)
+ return;
- // we already have the symbol
- if (_undefines.find(name) != _undefines.end())
- 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;
- NameAndAttributes info;
- // string is owned by _undefines
- info.name = ::strdup(name);
- if (decl->hasExternalWeakLinkage())
- info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
- else
- info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
- _undefines[name] = info;
+ 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;
-// Find exeternal symbols referenced by VALUE. This is a recursive function.
-void LTOModule::findExternalRefs(Value* value, Mangler &mangler) {
+ SmallString<64> name;
+ mangler.getNameWithPrefix(name, decl, false);
- 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;
+ StringMap<NameAndAttributes>::value_type &entry =
+ _undefines.GetOrCreateValue(name);
+
+ // we already have the symbol
+ if (entry.getValue().name)
+ return;
+
+ NameAndAttributes info;
+
+ info.name = entry.getKey().data();
+ if (decl->hasExternalWeakLinkage())
+ info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
+ else
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+
+ entry.setValue(info);
+}
+
+
+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;
+ }
}
-
- // 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);
+ 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;
+ }
}
-}
-void LTOModule::lazyParseSymbols()
-{
- if ( !_symbolsParsed ) {
- _symbolsParsed = true;
-
- // Use mangler to add GlobalPrefix to names to match linker names.
- Mangler mangler(*_module, _target->getTargetAsmInfo()->getGlobalPrefix());
- // add chars used in ObjC method names so method names aren't mangled
- mangler.markCharAcceptable('[');
- mangler.markCharAcceptable(']');
- mangler.markCharAcceptable('(');
- mangler.markCharAcceptable(')');
- mangler.markCharAcceptable('-');
- mangler.markCharAcceptable('+');
- mangler.markCharAcceptable(' ');
-
- // 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);
- }
+ // 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;
+ }
+ }
- // 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;
-
- // 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;
-
- // find end-of-line
- std::string::size_type pend = inlineAsm.find_first_of('\n', pbegin);
- if (pend == std::string::npos)
- break;
-
- asmSymbolName.assign(inlineAsm, pbegin, pend - pbegin);
- addAsmGlobalSymbol(asmSymbolName.c_str());
-
- // search next .globl
- pos = inlineAsm.find(glbl, pend);
- }
+ public:
+ typedef StringMap<State>::const_iterator const_iterator;
- // 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->getKeyData(), it->getKeyData()+
- it->getKeyLength()) == 0 ) {
- NameAndAttributes info = it->getValue();
- _symbols.push_back(info);
- }
- }
- }
+ 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,
+ unsigned AddrSpace) {}
+ virtual void EmitULEB128Value(const MCExpr *Value) {}
+ virtual void EmitSLEB128Value(const MCExpr *Value) {}
+ 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,
+ unsigned PointerSize) {}
+
+ 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<MCSubtargetInfo> STI(_target->getTarget().
+ createMCSubtargetInfo(_target->getTargetTriple(),
+ _target->getTargetCPU(),
+ _target->getTargetFeatureString()));
+ OwningPtr<TargetAsmParser>
+ TAP(_target->getTarget().createAsmParser(*STI, *Parser.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;
+}
-uint32_t LTOModule::getSymbolCount()
-{
- lazyParseSymbols();
- return _symbols.size();
+static bool isDeclaration(const GlobalValue &V) {
+ if (V.hasAvailableExternallyLinkage())
+ return true;
+ if (V.isMaterializable())
+ return false;
+ return V.isDeclaration();
+}
+
+static bool isAliasToDeclaration(const GlobalAlias &V) {
+ return isDeclaration(*V.getAliasedGlobal());
}
+bool LTOModule::ParseSymbols() {
+ // Use mangler to add GlobalPrefix to names to match linker names.
+ MCContext Context(*_target->getMCAsmInfo(), *_target->getRegisterInfo(),NULL);
+ Mangler mangler(Context, *_target->getTargetData());
-lto_symbol_attributes LTOModule::getSymbolAttributes(uint32_t index)
-{
- lazyParseSymbols();
- if ( index < _symbols.size() )
- return _symbols[index].attributes;
+ // add functions
+ for (Module::iterator f = _module->begin(); f != _module->end(); ++f) {
+ if (isDeclaration(*f))
+ addPotentialUndefinedSymbol(f, mangler);
else
- return lto_symbol_attributes(0);
-}
+ addDefinedFunctionSymbol(f, mangler);
+ }
-const char* LTOModule::getSymbolName(uint32_t index)
-{
- lazyParseSymbols();
- if ( index < _symbols.size() )
- return _symbols[index].name;
+ // add data
+ for (Module::global_iterator v = _module->global_begin(),
+ e = _module->global_end(); v != e; ++v) {
+ if (isDeclaration(*v))
+ 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 (isAliasToDeclaration(*i))
+ addPotentialUndefinedSymbol(i, mangler);
else
- return NULL;
+ 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;
}
projects / oota-llvm.git / blobdiff