-//===-LTOModule.cpp - LLVM Link Time Optimizer ----------------------------===//
+//===-- LTOModule.cpp - LLVM Link Time Optimizer --------------------------===//
//
// The LLVM Compiler Infrastructure
//
#include "LTOModule.h"
+#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/Host.h"
#include "llvm/System/Path.h"
#include "llvm/System/Process.h"
+#include "llvm/Target/Mangler.h"
#include "llvm/Target/SubtargetFeature.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetMachineRegistry.h"
-#include "llvm/Target/TargetAsmInfo.h"
-
-#include <fstream>
+#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 );
+ return llvm::sys::IdentifyFileType((char*)mem, length)
+ == llvm::sys::Bitcode_FileType;
}
bool LTOModule::isBitcodeFile(const char* path)
const char* triplePrefix)
{
MemoryBuffer* buffer = makeBuffer(mem, length);
- if ( buffer == NULL )
+ if (!buffer)
return false;
return isTargetMatch(buffer, triplePrefix);
}
// takes ownership of buffer
bool LTOModule::isTargetMatch(MemoryBuffer* buffer, const char* triplePrefix)
{
- OwningPtr<ModuleProvider> mp(getBitcodeModuleProvider(buffer));
- // on success, mp owns buffer and both are deleted at end of this method
- if ( !mp ) {
+ OwningPtr<Module> 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 = mp->getModule()->getTargetTriple();
- return ( strncmp(actualTarget.c_str(), triplePrefix,
+ std::string actualTarget = m->getTargetTriple();
+ return (strncmp(actualTarget.c_str(), triplePrefix,
strlen(triplePrefix)) == 0);
}
{
}
-LTOModule* LTOModule::makeLTOModule(const char* path, std::string& errMsg)
+LTOModule* LTOModule::makeLTOModule(const char* path,
+ std::string& errMsg)
{
OwningPtr<MemoryBuffer> buffer(MemoryBuffer::getFile(path, &errMsg));
- if ( !buffer )
+ if (!buffer)
return NULL;
return makeLTOModule(buffer.get(), errMsg);
}
/// 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);
+ 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)
+ std::string& errMsg)
{
OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length));
- if ( !buffer )
+ 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;
-
- 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(MemoryBuffer* buffer, std::string& errMsg)
+LTOModule* LTOModule::makeLTOModule(MemoryBuffer* buffer,
+ std::string& errMsg)
{
+ InitializeAllTargets();
+
// parse bitcode buffer
- OwningPtr<Module> m(ParseBitcodeFile(buffer, &errMsg));
- if ( !m )
+ OwningPtr<Module> m(ParseBitcodeFile(buffer, getGlobalContext(), &errMsg));
+ if (!m)
return NULL;
- // find machine architecture for this module
- const TargetMachineRegistry::entry* march =
- TargetMachineRegistry::getClosestStaticTargetForModule(*m, errMsg);
- if ( march == 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
- std::string FeatureStr = getFeatureString(m->getTargetTriple().c_str());
- TargetMachine* target = march->CtorFn(*m, FeatureStr);
+ const std::string FeatureStr =
+ SubtargetFeatures::getDefaultSubtargetFeatures(llvm::Triple(Triple));
+ TargetMachine* target = march->createTargetMachine(Triple, FeatureStr);
return new LTOModule(m.take(), target);
}
}
}
-void LTOModule::addDefinedDataSymbol(GlobalValue* v, Mangler &mangler)
+// get string that data pointer points to
+bool LTOModule::objcClassNameFromExpression(Constant* c, std::string& name)
+{
+ if (ConstantExpr* ce = dyn_cast<ConstantExpr>(c)) {
+ Constant* op = ce->getOperand(0);
+ if (GlobalVariable* gvn = dyn_cast<GlobalVariable>(op)) {
+ Constant* cn = gvn->getInitializer();
+ if (ConstantArray* ca = dyn_cast<ConstantArray>(cn)) {
+ if (ca->isCString()) {
+ name = ".objc_class_name_" + ca->getAsString();
+ return true;
+ }
+ }
+ }
+ }
+ return false;
+}
+
+// parse i386/ppc ObjC class data structure
+void LTOModule::addObjCClass(GlobalVariable* clgv)
+{
+ if (ConstantStruct* c = dyn_cast<ConstantStruct>(clgv->getInitializer())) {
+ // second slot in __OBJC,__class is pointer to superclass name
+ std::string superclassName;
+ if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
+ NameAndAttributes info;
+ 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 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 list data structure
+void LTOModule::addObjCClassRef(GlobalVariable* clgv)
+{
+ 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;
+ }
+ }
+}
+
+
+void LTOModule::addDefinedDataSymbol(GlobalValue* v, Mangler& mangler)
{
// add to list of defined symbols
addDefinedSymbol(v, mangler, false);
+ // Special case i386/ppc ObjC data structures in magic sections:
+ // The issue is that the old ObjC object format did some strange
+ // contortions to avoid real linker symbols. For instance, the
+ // ObjC class data structure is allocated statically in the executable
+ // that defines that class. That data structures contains a pointer to
+ // its superclass. But instead of just initializing that part of the
+ // struct to the address of its superclass, and letting the static and
+ // dynamic linkers do the rest, the runtime works by having that field
+ // instead point to a C-string that is the name of the superclass.
+ // At runtime the objc initialization updates that pointer and sets
+ // it to point to the actual super class. As far as the linker
+ // knows it is just a pointer to a string. But then someone wanted the
+ // linker to issue errors at build time if the superclass was not found.
+ // So they figured out a way in mach-o object format to use an absolute
+ // symbols (.objc_class_name_Foo = 0) and a floating reference
+ // (.reference .objc_class_name_Bar) to cause the linker into erroring when
+ // a class was missing.
+ // The following synthesizes the implicit .objc_* symbols for the linker
+ // from the ObjC data structures generated by the front end.
+ if (v->hasSection() /* && isTargetDarwin */) {
+ // special case if this data blob is an ObjC class definition
+ if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) {
+ if (GlobalVariable* gv = dyn_cast<GlobalVariable>(v)) {
+ addObjCClass(gv);
+ }
+ }
+
+ // special case if this data blob is an ObjC category definition
+ else if (v->getSection().compare(0, 18, "__OBJC,__category,") == 0) {
+ if (GlobalVariable* gv = dyn_cast<GlobalVariable>(v)) {
+ addObjCCategory(gv);
+ }
+ }
+
+ // special case if this data blob is the list of referenced classes
+ else if (v->getSection().compare(0, 18, "__OBJC,__cls_refs,") == 0) {
+ if (GlobalVariable* gv = dyn_cast<GlobalVariable>(v)) {
+ addObjCClassRef(gv);
+ }
+ }
+ }
+
// add external symbols referenced by this data.
for (unsigned count = 0, total = v->getNumOperands();
count != total; ++count) {
void LTOModule::addDefinedSymbol(GlobalValue* def, Mangler &mangler,
- bool isFunction)
+ bool isFunction)
{
+ // ignore all llvm.* symbols
+ if (def->getName().startswith("llvm."))
+ return;
+
// string is owned by _defines
- const char* symbolName = ::strdup(mangler.getValueName(def).c_str());
-
+ 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 )
+ if (isFunction)
attr |= LTO_SYMBOL_PERMISSIONS_CODE;
else {
GlobalVariable* gv = dyn_cast<GlobalVariable>(def);
- if ( (gv != NULL) && gv->isConstant() )
+ if (gv && gv->isConstant())
attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
else
attr |= LTO_SYMBOL_PERMISSIONS_DATA;
}
// set definition part
- if ( def->hasWeakLinkage() || def->hasLinkOnceLinkage() ) {
+ if (def->hasWeakLinkage() || def->hasLinkOnceLinkage()) {
attr |= LTO_SYMBOL_DEFINITION_WEAK;
}
- else if ( def->hasCommonLinkage()) {
+ else if (def->hasCommonLinkage()) {
attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
}
else {
}
// set scope part
- if ( def->hasHiddenVisibility() )
+ if (def->hasHiddenVisibility())
attr |= LTO_SYMBOL_SCOPE_HIDDEN;
- else if ( def->hasExternalLinkage() || def->hasWeakLinkage()
- || def->hasLinkOnceLinkage() )
+ 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;
}
void LTOModule::addAsmGlobalSymbol(const char *name) {
- // string is owned by _defines
- const char *symbolName = ::strdup(name);
- uint32_t attr = LTO_SYMBOL_DEFINITION_REGULAR;
- attr |= LTO_SYMBOL_SCOPE_DEFAULT;
-
- // add to table of symbols
- 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)
{
- const char* name = mangler.getValueName(decl).c_str();
// ignore all llvm.* symbols
- if ( strncmp(name, "llvm.", 5) != 0 ) {
- _undefines[name] = 1;
- }
+ if (decl->getName().startswith("llvm."))
+ return;
+
+ // ignore all aliases
+ if (isa<GlobalAlias>(decl))
+ return;
+
+ std::string name = mangler.getNameWithPrefix(decl);
+
+ // 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;
}
-// Find exeternal symbols referenced by VALUE. This is a recursive function.
+// Find external symbols referenced by VALUE. This is a recursive function.
void LTOModule::findExternalRefs(Value* value, Mangler &mangler) {
if (GlobalValue* gv = dyn_cast<GlobalValue>(value)) {
- if ( !gv->hasExternalLinkage() )
+ 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
// processed in addDefinedDataSymbol().
return;
}
-
+
// GlobalValue, even with InternalLinkage type, may have operands with
// ExternalLinkage type. Do not ignore these operands.
if (Constant* c = dyn_cast<Constant>(value)) {
- // Handle ConstantExpr, ConstantStruct, ConstantArry etc..
+ // 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 ) {
+ if (!_symbolsParsed) {
_symbolsParsed = true;
// Use mangler to add GlobalPrefix to names to match linker names.
- Mangler mangler(*_module, _target->getTargetAsmInfo()->getGlobalPrefix());
+ MCContext Context(*_target->getMCAsmInfo());
+ Mangler mangler(Context, *_target->getTargetData());
// add functions
for (Module::iterator f = _module->begin(); f != _module->end(); ++f) {
- if ( f->isDeclaration() )
+ 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() )
+ if (v->isDeclaration())
addPotentialUndefinedSymbol(v, mangler);
else
addDefinedDataSymbol(v, mangler);
}
// make symbols for all undefines
- for (StringSet::iterator it=_undefines.begin();
+ 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;
- info.name = it->getKeyData();
- info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
- _symbols.push_back(info);
+ if (_defines.count(it->getKey()) == 0) {
+ NameAndAttributes info = it->getValue();
+ _symbols.push_back(info);
}
}
}
lto_symbol_attributes LTOModule::getSymbolAttributes(uint32_t index)
{
lazyParseSymbols();
- if ( index < _symbols.size() )
+ 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() )
+ if (index < _symbols.size())
return _symbols[index].name;
else
return NULL;
}
-
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