//
//===----------------------------------------------------------------------===//
+#include "LTOModule.h"
+
#include "llvm/Module.h"
-#include "llvm/PassManager.h"
-#include "llvm/Linker.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
#include "llvm/ModuleProvider.h"
+#include "llvm/ADT/OwningPtr.h"
#include "llvm/Bitcode/ReaderWriter.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/System/Program.h"
+#include "llvm/Support/MathExtras.h"
#include "llvm/System/Path.h"
-#include "llvm/System/Signals.h"
-#include "llvm/Target/SubtargetFeature.h"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/Target/TargetData.h"
+#include "llvm/System/Process.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetMachineRegistry.h"
#include "llvm/Target/TargetAsmInfo.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Analysis/LoadValueNumbering.h"
-#include "llvm/Support/MathExtras.h"
-#include "LTOModule.h"
#include <fstream>
return llvm::sys::Path(path).isBitcodeFile();
}
-bool LTOModule::isBitcodeFileForTarget(const void* mem,
- size_t length, const char* triplePrefix)
+bool LTOModule::isBitcodeFileForTarget(const void* mem, size_t length,
+ const char* triplePrefix)
{
- bool result = false;
- MemoryBuffer* buffer;
- buffer = MemoryBuffer::getMemBuffer((char*)mem, (char*)mem+length);
- if ( buffer != NULL ) {
- ModuleProvider* mp = getBitcodeModuleProvider(buffer);
- if ( mp != NULL ) {
- std::string actualTarget = mp->getModule()->getTargetTriple();
- if ( strncmp(actualTarget.c_str(), triplePrefix,
- strlen(triplePrefix)) == 0) {
- result = true;
- }
- // mp destructor will delete buffer
- delete mp;
- }
- else {
- // if getBitcodeModuleProvider failed, we need to delete buffer
- delete buffer;
- }
- }
- return result;
+ MemoryBuffer* buffer = makeBuffer(mem, length);
+ if ( buffer == NULL )
+ return false;
+ return isTargetMatch(buffer, triplePrefix);
}
+
bool LTOModule::isBitcodeFileForTarget(const char* path,
- const char* triplePrefix)
+ const char* triplePrefix)
{
- bool result = false;
- MemoryBuffer* buffer;
- buffer = MemoryBuffer::getFile(path, strlen(path));
- if ( buffer != NULL ) {
- ModuleProvider* mp = getBitcodeModuleProvider(buffer);
- if ( mp != NULL ) {
- std::string actualTarget = mp->getModule()->getTargetTriple();
- if ( strncmp(actualTarget.c_str(), triplePrefix,
- strlen(triplePrefix)) == 0) {
- result = true;
- }
- // mp destructor will delete buffer
- delete mp;
- }
- else {
- // if getBitcodeModuleProvider failed, we need to delete buffer
- delete buffer;
- }
+ MemoryBuffer *buffer = MemoryBuffer::getFile(path);
+ if (buffer == NULL)
+ return false;
+ return isTargetMatch(buffer, triplePrefix);
+}
+
+// takes ownership of buffer
+bool LTOModule::isTargetMatch(MemoryBuffer* buffer, const char* triplePrefix)
+{
+ OwningPtr<ModuleProvider> mp(getBitcodeModuleProvider(buffer));
+ // on success, mp owns buffer and both are deleted at end of this method
+ if ( !mp ) {
+ delete buffer;
+ return false;
}
- return result;
+ std::string actualTarget = mp->getModule()->getTargetTriple();
+ return ( strncmp(actualTarget.c_str(), triplePrefix,
+ strlen(triplePrefix)) == 0);
}
{
}
-LTOModule::~LTOModule()
+LTOModule* LTOModule::makeLTOModule(const char* path, std::string& errMsg)
{
- delete _module;
- if ( _target != NULL )
- delete _target;
+ 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)
+/// 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)
{
- MemoryBuffer* buffer = MemoryBuffer::getFile(path, strlen(path));
- if ( buffer != NULL ) {
- Module* m = ParseBitcodeFile(buffer, &errMsg);
- delete buffer;
- if ( m != NULL ) {
- const TargetMachineRegistry::entry* march =
- TargetMachineRegistry::getClosestStaticTargetForModule(*m, errMsg);
- if ( march != NULL ) {
- std::string features;
- TargetMachine* target = march->CtorFn(*m, features);
- return new LTOModule(m, target);
- }
- }
- }
- return NULL;
+ 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(const void* mem, size_t length,
std::string& errMsg)
{
- MemoryBuffer* buffer;
- buffer = MemoryBuffer::getMemBuffer((char*)mem, (char*)mem+length);
- if ( buffer != NULL ) {
- Module* m = ParseBitcodeFile(buffer, &errMsg);
- delete buffer;
- if ( m != NULL ) {
- const TargetMachineRegistry::entry* march =
- TargetMachineRegistry::getClosestStaticTargetForModule(*m, errMsg);
- if ( march != NULL ) {
- std::string features;
- TargetMachine* target = march->CtorFn(*m, features);
- return new LTOModule(m, target);
- }
- }
- }
- return NULL;
+ OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length));
+ if ( !buffer )
+ return NULL;
+ return makeLTOModule(buffer.get(), errMsg);
+}
+
+LTOModule* LTOModule::makeLTOModule(MemoryBuffer* buffer, std::string& errMsg)
+{
+ // parse bitcode buffer
+ OwningPtr<Module> m(ParseBitcodeFile(buffer, &errMsg));
+ if ( !m )
+ return NULL;
+ // find machine architecture for this module
+ const TargetMachineRegistry::entry* march =
+ TargetMachineRegistry::getClosestStaticTargetForModule(*m, errMsg);
+ if ( march == NULL )
+ return NULL;
+ // construct LTModule, hand over ownership of module and target
+ std::string features;
+ TargetMachine* target = march->CtorFn(*m, features);
+ return new LTOModule(m.take(), target);
}
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::addDefinedDataSymbol(GlobalValue* v, Mangler &mangler)
+{
+ // add to list of defined symbols
+ addDefinedSymbol(v, mangler, false);
+
+ // add external symbols referenced by this data.
+ for (unsigned count = 0, total = v->getNumOperands();
+ count != total; ++count) {
+ findExternalRefs(v->getOperand(count), mangler);
+ }
+}
+
+
void LTOModule::addDefinedSymbol(GlobalValue* def, Mangler &mangler,
bool isFunction)
{
+ // string is owned by _defines
const char* symbolName = ::strdup(mangler.getValueName(def).c_str());
// set alignment part log2() can have rounding errors
uint32_t align = def->getAlignment();
- uint32_t attr = align ? __builtin_ctz(def->getAlignment()) : 0;
+ uint32_t attr = align ? CountTrailingZeros_32(def->getAlignment()) : 0;
// set permissions part
if ( isFunction )
// set definition part
if ( def->hasWeakLinkage() || def->hasLinkOnceLinkage() ) {
- // lvm bitcode does not differenciate between weak def data
- // and tentative definitions!
- // HACK HACK HACK
- // C++ does not use tentative definitions, but does use weak symbols
- // so guess that anything that looks like a C++ symbol is weak and others
- // are tentative definitions
- if ( (strncmp(symbolName, "__Z", 3) == 0) )
- attr |= LTO_SYMBOL_DEFINITION_WEAK;
- else {
- attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
- }
+ attr |= LTO_SYMBOL_DEFINITION_WEAK;
+ }
+ else if ( def->hasCommonLinkage()) {
+ attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
}
else {
attr |= LTO_SYMBOL_DEFINITION_REGULAR;
}
-void LTOModule::addUndefinedSymbol(const char* name)
-{
+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 (GlobalValue* gv = dyn_cast<GlobalValue>(value)) {
if ( !gv->hasExternalLinkage() )
- addUndefinedSymbol(mangler.getValueName(gv).c_str());
+ addPotentialUndefinedSymbol(gv, mangler);
+ // If this is a variable definition, do not recursively process
+ // initializer. It might contain a reference to this variable
+ // and cause an infinite loop. The initializer will be
+ // processed in addDefinedDataSymbol().
+ return;
}
-
+
// GlobalValue, even with InternalLinkage type, may have operands with
// ExternalLinkage type. Do not ignore these operands.
if (Constant* c = dyn_cast<Constant>(value)) {
}
}
-
-uint32_t LTOModule::getSymbolCount()
+void LTOModule::lazyParseSymbols()
{
if ( !_symbolsParsed ) {
_symbolsParsed = true;
// add functions
for (Module::iterator f = _module->begin(); f != _module->end(); ++f) {
- if ( f->isDeclaration() ) {
- addUndefinedSymbol(mangler.getValueName(f).c_str());
- }
- else {
- 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);
- }
- }
- }
- }
+ 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() ) {
- addUndefinedSymbol(mangler.getValueName(v).c_str());
- }
- else {
- addDefinedSymbol(v, mangler, false);
- // add external symbols referenced by this data
- for (unsigned count = 0, total = v->getNumOperands();
- count != total; ++count) {
- findExternalRefs(v->getOperand(count), mangler);
- }
- }
+ if ( v->isDeclaration() )
+ addPotentialUndefinedSymbol(v, mangler);
+ else
+ addDefinedDataSymbol(v, mangler);
}
// make symbols for all undefines
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.find(it->getKeyData(), it->getKeyData()+it->getKeyLength()) == _defines.end() ) {
+ 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);
}
}
-
- }
-
+ }
+}
+
+
+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
const char* LTOModule::getSymbolName(uint32_t index)
{
+ lazyParseSymbols();
if ( index < _symbols.size() )
return _symbols[index].name;
else
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