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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69972 91177308-0d34-0410-b5e6-96231b3b80d8
393 lines
13 KiB
C++
393 lines
13 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/Module.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/ADT/OwningPtr.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/Mangler.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/Path.h"
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#include "llvm/System/Process.h"
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#include "llvm/Target/SubtargetFeature.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachineRegistry.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include <fstream>
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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 == NULL )
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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<ModuleProvider> mp(getBitcodeModuleProvider(buffer));
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// on success, mp owns buffer and both are deleted at end of this method
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if ( !mp ) {
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delete buffer;
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return false;
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}
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std::string actualTarget = mp->getModule()->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, 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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/// getFeatureString - Return a string listing the features associated with the
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/// target triple.
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///
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/// FIXME: This is an inelegant way of specifying the features of a
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/// subtarget. It would be better if we could encode this information into the
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/// IR. See <rdar://5972456>.
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std::string getFeatureString(const char *TargetTriple) {
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SubtargetFeatures Features;
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if (strncmp(TargetTriple, "powerpc-apple-", 14) == 0) {
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Features.AddFeature("altivec", true);
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} else if (strncmp(TargetTriple, "powerpc64-apple-", 16) == 0) {
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Features.AddFeature("64bit", true);
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Features.AddFeature("altivec", true);
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}
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return Features.getString();
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}
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LTOModule* LTOModule::makeLTOModule(MemoryBuffer* buffer, std::string& errMsg)
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{
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// parse bitcode buffer
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OwningPtr<Module> m(ParseBitcodeFile(buffer, &errMsg));
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if ( !m )
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return NULL;
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// find machine architecture for this module
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const TargetMachineRegistry::entry* march =
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TargetMachineRegistry::getClosestStaticTargetForModule(*m, errMsg);
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if ( march == NULL )
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return NULL;
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// construct LTModule, hand over ownership of module and target
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std::string FeatureStr = getFeatureString(m->getTargetTriple().c_str());
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TargetMachine* target = march->CtorFn(*m, 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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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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// 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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// string is owned by _defines
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const char* symbolName = ::strdup(mangler.getValueName(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 != NULL) && 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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// 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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// 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::addPotentialUndefinedSymbol(GlobalValue* decl, Mangler &mangler)
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{
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const char* name = mangler.getValueName(decl).c_str();
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// ignore all llvm.* symbols
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if ( strncmp(name, "llvm.", 5) == 0 )
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return;
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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);
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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 exeternal 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(*_module, _target->getTargetAsmInfo()->getGlobalPrefix());
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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());
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// search next .globl
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pos = inlineAsm.find(glbl, pend);
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}
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// make symbols for all undefines
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for (StringMap<NameAndAttributes>::iterator it=_undefines.begin();
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it != _undefines.end(); ++it) {
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// if this symbol also has a definition, then don't make an undefine
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// because it is a tentative definition
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if ( _defines.count(it->getKeyData(), it->getKeyData()+
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it->getKeyLength()) == 0 ) {
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NameAndAttributes info = it->getValue();
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_symbols.push_back(info);
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}
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}
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}
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}
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uint32_t LTOModule::getSymbolCount()
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{
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lazyParseSymbols();
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return _symbols.size();
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}
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lto_symbol_attributes LTOModule::getSymbolAttributes(uint32_t index)
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{
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lazyParseSymbols();
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if ( index < _symbols.size() )
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return _symbols[index].attributes;
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else
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return lto_symbol_attributes(0);
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}
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const char* LTOModule::getSymbolName(uint32_t index)
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{
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lazyParseSymbols();
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if ( index < _symbols.size() )
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return _symbols[index].name;
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else
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return NULL;
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}
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