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Modules and ModuleProviders. Because the "ModuleProvider" simply materializes GlobalValues now, and doesn't provide modules, it's renamed to "GVMaterializer". Code that used to need a ModuleProvider to materialize Functions can now materialize the Functions directly. Functions no longer use a magic linkage to record that they're materializable; they simply ask the GVMaterializer. Because the C ABI must never change, we can't remove LLVMModuleProviderRef or the functions that refer to it. Instead, because Module now exposes the same functionality ModuleProvider used to, we store a Module* in any LLVMModuleProviderRef and translate in the wrapper methods. The bindings to other languages still use the ModuleProvider concept. It would probably be worth some time to update them to follow the C++ more closely, but I don't intend to do it. Fixes http://llvm.org/PR5737 and http://llvm.org/PR5735. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94686 91177308-0d34-0410-b5e6-96231b3b80d8
523 lines
18 KiB
C++
523 lines
18 KiB
C++
//===-LTOModule.cpp - LLVM Link Time Optimizer ----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Link Time Optimization library. This library is
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// intended to be used by linker to optimize code at link time.
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//
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//===----------------------------------------------------------------------===//
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#include "LTOModule.h"
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#include "llvm/Constants.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/Support/SystemUtils.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/System/Host.h"
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#include "llvm/System/Path.h"
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#include "llvm/System/Process.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/Target/SubtargetFeature.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Target/TargetSelect.h"
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using namespace llvm;
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bool LTOModule::isBitcodeFile(const void* mem, size_t length)
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{
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return llvm::sys::IdentifyFileType((char*)mem, length)
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== llvm::sys::Bitcode_FileType;
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}
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bool LTOModule::isBitcodeFile(const char* path)
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{
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return llvm::sys::Path(path).isBitcodeFile();
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}
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bool LTOModule::isBitcodeFileForTarget(const void* mem, size_t length,
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const char* triplePrefix)
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{
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MemoryBuffer* buffer = makeBuffer(mem, length);
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if (!buffer)
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return false;
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return isTargetMatch(buffer, triplePrefix);
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}
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bool LTOModule::isBitcodeFileForTarget(const char* path,
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const char* triplePrefix)
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{
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MemoryBuffer *buffer = MemoryBuffer::getFile(path);
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if (buffer == NULL)
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return false;
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return isTargetMatch(buffer, triplePrefix);
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}
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// takes ownership of buffer
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bool LTOModule::isTargetMatch(MemoryBuffer* buffer, const char* triplePrefix)
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{
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OwningPtr<Module> m(getLazyBitcodeModule(buffer, getGlobalContext()));
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// on success, m owns buffer and both are deleted at end of this method
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if (!m) {
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delete buffer;
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return false;
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}
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std::string actualTarget = m->getTargetTriple();
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return (strncmp(actualTarget.c_str(), triplePrefix,
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strlen(triplePrefix)) == 0);
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}
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LTOModule::LTOModule(Module* m, TargetMachine* t)
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: _module(m), _target(t), _symbolsParsed(false)
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{
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}
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LTOModule* LTOModule::makeLTOModule(const char* path,
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std::string& errMsg)
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{
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OwningPtr<MemoryBuffer> buffer(MemoryBuffer::getFile(path, &errMsg));
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if (!buffer)
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return NULL;
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return makeLTOModule(buffer.get(), errMsg);
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}
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/// makeBuffer - create a MemoryBuffer from a memory range.
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/// MemoryBuffer requires the byte past end of the buffer to be a zero.
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/// We might get lucky and already be that way, otherwise make a copy.
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/// Also if next byte is on a different page, don't assume it is readable.
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MemoryBuffer* LTOModule::makeBuffer(const void* mem, size_t length)
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{
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const char* startPtr = (char*)mem;
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const char* endPtr = startPtr+length;
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if ((((uintptr_t)endPtr & (sys::Process::GetPageSize()-1)) == 0)
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|| (*endPtr != 0))
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return MemoryBuffer::getMemBufferCopy(startPtr, endPtr);
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else
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return MemoryBuffer::getMemBuffer(startPtr, endPtr);
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}
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LTOModule* LTOModule::makeLTOModule(const void* mem, size_t length,
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std::string& errMsg)
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{
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OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length));
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if (!buffer)
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return NULL;
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return makeLTOModule(buffer.get(), errMsg);
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}
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LTOModule* LTOModule::makeLTOModule(MemoryBuffer* buffer,
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std::string& errMsg)
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{
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InitializeAllTargets();
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// parse bitcode buffer
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OwningPtr<Module> m(ParseBitcodeFile(buffer, getGlobalContext(), &errMsg));
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if (!m)
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return NULL;
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std::string Triple = m->getTargetTriple();
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if (Triple.empty())
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Triple = sys::getHostTriple();
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// find machine architecture for this module
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const Target* march = TargetRegistry::lookupTarget(Triple, errMsg);
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if (!march)
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return NULL;
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// construct LTModule, hand over ownership of module and target
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const std::string FeatureStr =
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SubtargetFeatures::getDefaultSubtargetFeatures(llvm::Triple(Triple));
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TargetMachine* target = march->createTargetMachine(Triple, FeatureStr);
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return new LTOModule(m.take(), target);
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}
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const char* LTOModule::getTargetTriple()
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{
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return _module->getTargetTriple().c_str();
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}
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void LTOModule::addDefinedFunctionSymbol(Function* f, Mangler &mangler)
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{
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// add to list of defined symbols
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addDefinedSymbol(f, mangler, true);
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// add external symbols referenced by this function.
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for (Function::iterator b = f->begin(); b != f->end(); ++b) {
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for (BasicBlock::iterator i = b->begin(); i != b->end(); ++i) {
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for (unsigned count = 0, total = i->getNumOperands();
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count != total; ++count) {
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findExternalRefs(i->getOperand(count), mangler);
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}
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}
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}
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}
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// get string that data pointer points to
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bool LTOModule::objcClassNameFromExpression(Constant* c, std::string& name)
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{
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if (ConstantExpr* ce = dyn_cast<ConstantExpr>(c)) {
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Constant* op = ce->getOperand(0);
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if (GlobalVariable* gvn = dyn_cast<GlobalVariable>(op)) {
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Constant* cn = gvn->getInitializer();
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if (ConstantArray* ca = dyn_cast<ConstantArray>(cn)) {
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if (ca->isCString()) {
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name = ".objc_class_name_" + ca->getAsString();
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return true;
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}
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}
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}
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}
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return false;
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}
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// parse i386/ppc ObjC class data structure
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void LTOModule::addObjCClass(GlobalVariable* clgv)
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{
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if (ConstantStruct* c = dyn_cast<ConstantStruct>(clgv->getInitializer())) {
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// second slot in __OBJC,__class is pointer to superclass name
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std::string superclassName;
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if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
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NameAndAttributes info;
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if (_undefines.find(superclassName.c_str()) == _undefines.end()) {
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const char* symbolName = ::strdup(superclassName.c_str());
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info.name = ::strdup(symbolName);
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info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
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// string is owned by _undefines
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_undefines[info.name] = info;
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}
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}
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// third slot in __OBJC,__class is pointer to class name
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std::string className;
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if (objcClassNameFromExpression(c->getOperand(2), className)) {
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const char* symbolName = ::strdup(className.c_str());
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NameAndAttributes info;
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info.name = symbolName;
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info.attributes = (lto_symbol_attributes)
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(LTO_SYMBOL_PERMISSIONS_DATA |
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LTO_SYMBOL_DEFINITION_REGULAR |
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LTO_SYMBOL_SCOPE_DEFAULT);
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_symbols.push_back(info);
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_defines[info.name] = 1;
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}
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}
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}
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// parse i386/ppc ObjC category data structure
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void LTOModule::addObjCCategory(GlobalVariable* clgv)
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{
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if (ConstantStruct* c = dyn_cast<ConstantStruct>(clgv->getInitializer())) {
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// second slot in __OBJC,__category is pointer to target class name
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std::string targetclassName;
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if (objcClassNameFromExpression(c->getOperand(1), targetclassName)) {
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NameAndAttributes info;
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if (_undefines.find(targetclassName.c_str()) == _undefines.end()) {
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const char* symbolName = ::strdup(targetclassName.c_str());
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info.name = ::strdup(symbolName);
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info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
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// string is owned by _undefines
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_undefines[info.name] = info;
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}
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}
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}
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}
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// parse i386/ppc ObjC class list data structure
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void LTOModule::addObjCClassRef(GlobalVariable* clgv)
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{
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std::string targetclassName;
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if (objcClassNameFromExpression(clgv->getInitializer(), targetclassName)) {
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NameAndAttributes info;
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if (_undefines.find(targetclassName.c_str()) == _undefines.end()) {
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const char* symbolName = ::strdup(targetclassName.c_str());
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info.name = ::strdup(symbolName);
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info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
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// string is owned by _undefines
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_undefines[info.name] = info;
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}
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}
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}
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void LTOModule::addDefinedDataSymbol(GlobalValue* v, Mangler& mangler)
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{
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// add to list of defined symbols
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addDefinedSymbol(v, mangler, false);
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// Special case i386/ppc ObjC data structures in magic sections:
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// The issue is that the old ObjC object format did some strange
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// contortions to avoid real linker symbols. For instance, the
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// ObjC class data structure is allocated statically in the executable
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// that defines that class. That data structures contains a pointer to
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// its superclass. But instead of just initializing that part of the
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// struct to the address of its superclass, and letting the static and
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// dynamic linkers do the rest, the runtime works by having that field
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// instead point to a C-string that is the name of the superclass.
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// At runtime the objc initialization updates that pointer and sets
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// it to point to the actual super class. As far as the linker
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// knows it is just a pointer to a string. But then someone wanted the
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// linker to issue errors at build time if the superclass was not found.
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// So they figured out a way in mach-o object format to use an absolute
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// symbols (.objc_class_name_Foo = 0) and a floating reference
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// (.reference .objc_class_name_Bar) to cause the linker into erroring when
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// a class was missing.
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// The following synthesizes the implicit .objc_* symbols for the linker
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// from the ObjC data structures generated by the front end.
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if (v->hasSection() /* && isTargetDarwin */) {
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// special case if this data blob is an ObjC class definition
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if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) {
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if (GlobalVariable* gv = dyn_cast<GlobalVariable>(v)) {
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addObjCClass(gv);
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}
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}
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// special case if this data blob is an ObjC category definition
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else if (v->getSection().compare(0, 18, "__OBJC,__category,") == 0) {
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if (GlobalVariable* gv = dyn_cast<GlobalVariable>(v)) {
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addObjCCategory(gv);
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}
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}
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// special case if this data blob is the list of referenced classes
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else if (v->getSection().compare(0, 18, "__OBJC,__cls_refs,") == 0) {
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if (GlobalVariable* gv = dyn_cast<GlobalVariable>(v)) {
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addObjCClassRef(gv);
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}
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}
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}
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// add external symbols referenced by this data.
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for (unsigned count = 0, total = v->getNumOperands();
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count != total; ++count) {
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findExternalRefs(v->getOperand(count), mangler);
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}
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}
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void LTOModule::addDefinedSymbol(GlobalValue* def, Mangler &mangler,
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bool isFunction)
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{
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// ignore all llvm.* symbols
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if (def->getName().startswith("llvm."))
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return;
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// string is owned by _defines
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const char* symbolName = ::strdup(mangler.getNameWithPrefix(def).c_str());
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// set alignment part log2() can have rounding errors
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uint32_t align = def->getAlignment();
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uint32_t attr = align ? CountTrailingZeros_32(def->getAlignment()) : 0;
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// set permissions part
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if (isFunction)
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attr |= LTO_SYMBOL_PERMISSIONS_CODE;
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else {
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GlobalVariable* gv = dyn_cast<GlobalVariable>(def);
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if (gv && gv->isConstant())
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attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
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else
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attr |= LTO_SYMBOL_PERMISSIONS_DATA;
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}
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// set definition part
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if (def->hasWeakLinkage() || def->hasLinkOnceLinkage()) {
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attr |= LTO_SYMBOL_DEFINITION_WEAK;
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}
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else if (def->hasCommonLinkage()) {
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attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
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}
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else {
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attr |= LTO_SYMBOL_DEFINITION_REGULAR;
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}
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// set scope part
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if (def->hasHiddenVisibility())
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attr |= LTO_SYMBOL_SCOPE_HIDDEN;
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else if (def->hasProtectedVisibility())
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attr |= LTO_SYMBOL_SCOPE_PROTECTED;
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else if (def->hasExternalLinkage() || def->hasWeakLinkage()
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|| def->hasLinkOnceLinkage() || def->hasCommonLinkage())
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attr |= LTO_SYMBOL_SCOPE_DEFAULT;
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else
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attr |= LTO_SYMBOL_SCOPE_INTERNAL;
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// add to table of symbols
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NameAndAttributes info;
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info.name = symbolName;
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info.attributes = (lto_symbol_attributes)attr;
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_symbols.push_back(info);
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_defines[info.name] = 1;
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}
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void LTOModule::addAsmGlobalSymbol(const char *name) {
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// only add new define if not already defined
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if (_defines.count(name) == 0)
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return;
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// string is owned by _defines
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const char *symbolName = ::strdup(name);
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uint32_t attr = LTO_SYMBOL_DEFINITION_REGULAR;
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attr |= LTO_SYMBOL_SCOPE_DEFAULT;
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NameAndAttributes info;
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info.name = symbolName;
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info.attributes = (lto_symbol_attributes)attr;
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_symbols.push_back(info);
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_defines[info.name] = 1;
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}
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void LTOModule::addPotentialUndefinedSymbol(GlobalValue* decl, Mangler &mangler)
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{
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// ignore all llvm.* symbols
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if (decl->getName().startswith("llvm."))
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return;
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// ignore all aliases
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if (isa<GlobalAlias>(decl))
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return;
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std::string name = mangler.getNameWithPrefix(decl);
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// we already have the symbol
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if (_undefines.find(name) != _undefines.end())
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return;
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NameAndAttributes info;
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// string is owned by _undefines
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info.name = ::strdup(name.c_str());
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if (decl->hasExternalWeakLinkage())
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info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
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else
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info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
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_undefines[name] = info;
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}
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// Find external symbols referenced by VALUE. This is a recursive function.
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void LTOModule::findExternalRefs(Value* value, Mangler &mangler) {
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if (GlobalValue* gv = dyn_cast<GlobalValue>(value)) {
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if (!gv->hasExternalLinkage())
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addPotentialUndefinedSymbol(gv, mangler);
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// If this is a variable definition, do not recursively process
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// initializer. It might contain a reference to this variable
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// and cause an infinite loop. The initializer will be
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// processed in addDefinedDataSymbol().
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return;
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}
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// GlobalValue, even with InternalLinkage type, may have operands with
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// ExternalLinkage type. Do not ignore these operands.
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if (Constant* c = dyn_cast<Constant>(value)) {
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// Handle ConstantExpr, ConstantStruct, ConstantArry etc.
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for (unsigned i = 0, e = c->getNumOperands(); i != e; ++i)
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findExternalRefs(c->getOperand(i), mangler);
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}
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}
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void LTOModule::lazyParseSymbols()
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{
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if (!_symbolsParsed) {
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_symbolsParsed = true;
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// Use mangler to add GlobalPrefix to names to match linker names.
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Mangler mangler(*_target->getMCAsmInfo());
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// add functions
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for (Module::iterator f = _module->begin(); f != _module->end(); ++f) {
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if (f->isDeclaration())
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addPotentialUndefinedSymbol(f, mangler);
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else
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addDefinedFunctionSymbol(f, mangler);
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}
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// add data
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for (Module::global_iterator v = _module->global_begin(),
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e = _module->global_end(); v != e; ++v) {
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if (v->isDeclaration())
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addPotentialUndefinedSymbol(v, mangler);
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else
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addDefinedDataSymbol(v, mangler);
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}
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// add asm globals
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const std::string &inlineAsm = _module->getModuleInlineAsm();
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const std::string glbl = ".globl";
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std::string asmSymbolName;
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std::string::size_type pos = inlineAsm.find(glbl, 0);
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while (pos != std::string::npos) {
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// eat .globl
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pos = pos + 6;
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// skip white space between .globl and symbol name
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std::string::size_type pbegin = inlineAsm.find_first_not_of(' ', pos);
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if (pbegin == std::string::npos)
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break;
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// find end-of-line
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std::string::size_type pend = inlineAsm.find_first_of('\n', pbegin);
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if (pend == std::string::npos)
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break;
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asmSymbolName.assign(inlineAsm, pbegin, pend - pbegin);
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addAsmGlobalSymbol(asmSymbolName.c_str());
|
|
|
|
// search next .globl
|
|
pos = inlineAsm.find(glbl, pend);
|
|
}
|
|
|
|
// 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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
const char* LTOModule::getSymbolName(uint32_t index)
|
|
{
|
|
lazyParseSymbols();
|
|
if (index < _symbols.size())
|
|
return _symbols[index].name;
|
|
else
|
|
return NULL;
|
|
}
|