mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-12 14:06:36 +00:00
2e96785311
llvm-svn: 136027
730 lines
23 KiB
C++
730 lines
23 KiB
C++
//===-- LTOModule.cpp - LLVM Link Time Optimizer --------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the Link Time Optimization library. This library is
|
|
// intended to be used by linker to optimize code at link time.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "LTOModule.h"
|
|
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/LLVMContext.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/ADT/OwningPtr.h"
|
|
#include "llvm/ADT/Triple.h"
|
|
#include "llvm/Bitcode/ReaderWriter.h"
|
|
#include "llvm/Support/SystemUtils.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Support/MathExtras.h"
|
|
#include "llvm/Support/Host.h"
|
|
#include "llvm/Support/Path.h"
|
|
#include "llvm/Support/Process.h"
|
|
#include "llvm/Support/SourceMgr.h"
|
|
#include "llvm/Support/system_error.h"
|
|
#include "llvm/Target/Mangler.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/MC/MCParser/MCAsmParser.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/MC/MCSubtargetInfo.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/MC/SubtargetFeature.h"
|
|
#include "llvm/MC/MCTargetAsmParser.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetRegisterInfo.h"
|
|
#include "llvm/Target/TargetRegistry.h"
|
|
#include "llvm/Target/TargetSelect.h"
|
|
|
|
using namespace llvm;
|
|
|
|
bool LTOModule::isBitcodeFile(const void *mem, size_t length) {
|
|
return llvm::sys::IdentifyFileType((char*)mem, length)
|
|
== llvm::sys::Bitcode_FileType;
|
|
}
|
|
|
|
bool LTOModule::isBitcodeFile(const char *path) {
|
|
return llvm::sys::Path(path).isBitcodeFile();
|
|
}
|
|
|
|
bool LTOModule::isBitcodeFileForTarget(const void *mem, size_t length,
|
|
const char *triplePrefix) {
|
|
MemoryBuffer *buffer = makeBuffer(mem, length);
|
|
if (!buffer)
|
|
return false;
|
|
return isTargetMatch(buffer, triplePrefix);
|
|
}
|
|
|
|
|
|
bool LTOModule::isBitcodeFileForTarget(const char *path,
|
|
const char *triplePrefix) {
|
|
OwningPtr<MemoryBuffer> buffer;
|
|
if (MemoryBuffer::getFile(path, buffer))
|
|
return false;
|
|
return isTargetMatch(buffer.take(), triplePrefix);
|
|
}
|
|
|
|
// Takes ownership of buffer.
|
|
bool LTOModule::isTargetMatch(MemoryBuffer *buffer, const char *triplePrefix) {
|
|
std::string Triple = getBitcodeTargetTriple(buffer, getGlobalContext());
|
|
delete buffer;
|
|
return (strncmp(Triple.c_str(), triplePrefix,
|
|
strlen(triplePrefix)) == 0);
|
|
}
|
|
|
|
|
|
LTOModule::LTOModule(Module *m, TargetMachine *t)
|
|
: _module(m), _target(t)
|
|
{
|
|
}
|
|
|
|
LTOModule *LTOModule::makeLTOModule(const char *path,
|
|
std::string &errMsg) {
|
|
OwningPtr<MemoryBuffer> buffer;
|
|
if (error_code ec = MemoryBuffer::getFile(path, buffer)) {
|
|
errMsg = ec.message();
|
|
return NULL;
|
|
}
|
|
return makeLTOModule(buffer.take(), errMsg);
|
|
}
|
|
|
|
LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
|
|
size_t size,
|
|
std::string &errMsg) {
|
|
return makeLTOModule(fd, path, size, size, 0, errMsg);
|
|
}
|
|
|
|
LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
|
|
size_t file_size,
|
|
size_t map_size,
|
|
off_t offset,
|
|
std::string &errMsg) {
|
|
OwningPtr<MemoryBuffer> buffer;
|
|
if (error_code ec = MemoryBuffer::getOpenFile(fd, path, buffer, file_size,
|
|
map_size, offset, false)) {
|
|
errMsg = ec.message();
|
|
return NULL;
|
|
}
|
|
return makeLTOModule(buffer.take(), errMsg);
|
|
}
|
|
|
|
/// makeBuffer - Create a MemoryBuffer from a memory range.
|
|
MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length) {
|
|
const char *startPtr = (char*)mem;
|
|
return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), "", false);
|
|
}
|
|
|
|
|
|
LTOModule *LTOModule::makeLTOModule(const void *mem, size_t length,
|
|
std::string &errMsg) {
|
|
OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length));
|
|
if (!buffer)
|
|
return NULL;
|
|
return makeLTOModule(buffer.take(), errMsg);
|
|
}
|
|
|
|
LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer,
|
|
std::string &errMsg) {
|
|
static bool Initialized = false;
|
|
if (!Initialized) {
|
|
InitializeAllTargets();
|
|
InitializeAllTargetMCs();
|
|
InitializeAllAsmParsers();
|
|
Initialized = true;
|
|
}
|
|
|
|
// parse bitcode buffer
|
|
OwningPtr<Module> m(getLazyBitcodeModule(buffer, getGlobalContext(),
|
|
&errMsg));
|
|
if (!m) {
|
|
delete buffer;
|
|
return NULL;
|
|
}
|
|
|
|
std::string Triple = m->getTargetTriple();
|
|
if (Triple.empty())
|
|
Triple = sys::getHostTriple();
|
|
|
|
// find machine architecture for this module
|
|
const Target *march = TargetRegistry::lookupTarget(Triple, errMsg);
|
|
if (!march)
|
|
return NULL;
|
|
|
|
// construct LTOModule, hand over ownership of module and target
|
|
SubtargetFeatures Features;
|
|
Features.getDefaultSubtargetFeatures(llvm::Triple(Triple));
|
|
std::string FeatureStr = Features.getString();
|
|
std::string CPU;
|
|
TargetMachine *target = march->createTargetMachine(Triple, CPU, FeatureStr);
|
|
LTOModule *Ret = new LTOModule(m.take(), target);
|
|
bool Err = Ret->ParseSymbols();
|
|
if (Err) {
|
|
delete Ret;
|
|
return NULL;
|
|
}
|
|
return Ret;
|
|
}
|
|
|
|
|
|
const char *LTOModule::getTargetTriple() {
|
|
return _module->getTargetTriple().c_str();
|
|
}
|
|
|
|
void LTOModule::setTargetTriple(const char *triple) {
|
|
_module->setTargetTriple(triple);
|
|
}
|
|
|
|
void LTOModule::addDefinedFunctionSymbol(Function *f, Mangler &mangler) {
|
|
// add to list of defined symbols
|
|
addDefinedSymbol(f, mangler, true);
|
|
}
|
|
|
|
// Get string that data pointer points to.
|
|
bool LTOModule::objcClassNameFromExpression(Constant *c, std::string &name) {
|
|
if (ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) {
|
|
Constant *op = ce->getOperand(0);
|
|
if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) {
|
|
Constant *cn = gvn->getInitializer();
|
|
if (ConstantArray *ca = dyn_cast<ConstantArray>(cn)) {
|
|
if (ca->isCString()) {
|
|
name = ".objc_class_name_" + ca->getAsCString();
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
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;
|
|
StringMap<NameAndAttributes>::value_type &entry =
|
|
_undefines.GetOrCreateValue(superclassName);
|
|
if (!entry.getValue().name) {
|
|
const char *symbolName = entry.getKey().data();
|
|
info.name = symbolName;
|
|
info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
|
|
entry.setValue(info);
|
|
}
|
|
}
|
|
// third slot in __OBJC,__class is pointer to class name
|
|
std::string className;
|
|
if (objcClassNameFromExpression(c->getOperand(2), className)) {
|
|
StringSet::value_type &entry =
|
|
_defines.GetOrCreateValue(className);
|
|
entry.setValue(1);
|
|
NameAndAttributes info;
|
|
info.name = entry.getKey().data();
|
|
info.attributes = (lto_symbol_attributes)
|
|
(LTO_SYMBOL_PERMISSIONS_DATA |
|
|
LTO_SYMBOL_DEFINITION_REGULAR |
|
|
LTO_SYMBOL_SCOPE_DEFAULT);
|
|
_symbols.push_back(info);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// Parse i386/ppc ObjC 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;
|
|
|
|
StringMap<NameAndAttributes>::value_type &entry =
|
|
_undefines.GetOrCreateValue(targetclassName);
|
|
|
|
if (entry.getValue().name)
|
|
return;
|
|
|
|
const char *symbolName = entry.getKey().data();
|
|
info.name = symbolName;
|
|
info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
|
|
entry.setValue(info);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// Parse i386/ppc ObjC class list data structure.
|
|
void LTOModule::addObjCClassRef(GlobalVariable *clgv) {
|
|
std::string targetclassName;
|
|
if (objcClassNameFromExpression(clgv->getInitializer(), targetclassName)) {
|
|
NameAndAttributes info;
|
|
|
|
StringMap<NameAndAttributes>::value_type &entry =
|
|
_undefines.GetOrCreateValue(targetclassName);
|
|
if (entry.getValue().name)
|
|
return;
|
|
|
|
const char *symbolName = entry.getKey().data();
|
|
info.name = symbolName;
|
|
info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
|
|
entry.setValue(info);
|
|
}
|
|
}
|
|
|
|
|
|
void LTOModule::addDefinedDataSymbol(GlobalValue *v, Mangler &mangler) {
|
|
// Add to list of defined symbols.
|
|
addDefinedSymbol(v, mangler, false);
|
|
|
|
// Special case i386/ppc ObjC data structures in magic sections:
|
|
// The issue is that the old ObjC object format did some strange
|
|
// contortions to avoid real linker symbols. For instance, the
|
|
// ObjC class data structure is allocated statically in the executable
|
|
// that defines that class. That data structures contains a pointer to
|
|
// its superclass. But instead of just initializing that part of the
|
|
// struct to the address of its superclass, and letting the static and
|
|
// dynamic linkers do the rest, the runtime works by having that field
|
|
// instead point to a C-string that is the name of the superclass.
|
|
// At runtime the objc initialization updates that pointer and sets
|
|
// it to point to the actual super class. As far as the linker
|
|
// knows it is just a pointer to a string. But then someone wanted the
|
|
// linker to issue errors at build time if the superclass was not found.
|
|
// So they figured out a way in mach-o object format to use an absolute
|
|
// symbols (.objc_class_name_Foo = 0) and a floating reference
|
|
// (.reference .objc_class_name_Bar) to cause the linker into erroring when
|
|
// a class was missing.
|
|
// The following synthesizes the implicit .objc_* symbols for the linker
|
|
// from the ObjC data structures generated by the front end.
|
|
if (v->hasSection() /* && isTargetDarwin */) {
|
|
// special case if this data blob is an ObjC class definition
|
|
if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) {
|
|
if (GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
|
|
addObjCClass(gv);
|
|
}
|
|
}
|
|
|
|
// 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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void LTOModule::addDefinedSymbol(GlobalValue *def, Mangler &mangler,
|
|
bool isFunction) {
|
|
// ignore all llvm.* symbols
|
|
if (def->getName().startswith("llvm."))
|
|
return;
|
|
|
|
// string is owned by _defines
|
|
SmallString<64> Buffer;
|
|
mangler.getNameWithPrefix(Buffer, def, false);
|
|
|
|
// set alignment part log2() can have rounding errors
|
|
uint32_t align = def->getAlignment();
|
|
uint32_t attr = align ? CountTrailingZeros_32(def->getAlignment()) : 0;
|
|
|
|
// set permissions part
|
|
if (isFunction)
|
|
attr |= LTO_SYMBOL_PERMISSIONS_CODE;
|
|
else {
|
|
GlobalVariable *gv = dyn_cast<GlobalVariable>(def);
|
|
if (gv && gv->isConstant())
|
|
attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
|
|
else
|
|
attr |= LTO_SYMBOL_PERMISSIONS_DATA;
|
|
}
|
|
|
|
// set definition part
|
|
if (def->hasWeakLinkage() || def->hasLinkOnceLinkage() ||
|
|
def->hasLinkerPrivateWeakLinkage() ||
|
|
def->hasLinkerPrivateWeakDefAutoLinkage())
|
|
attr |= LTO_SYMBOL_DEFINITION_WEAK;
|
|
else if (def->hasCommonLinkage())
|
|
attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
|
|
else
|
|
attr |= LTO_SYMBOL_DEFINITION_REGULAR;
|
|
|
|
// set scope part
|
|
if (def->hasHiddenVisibility())
|
|
attr |= LTO_SYMBOL_SCOPE_HIDDEN;
|
|
else if (def->hasProtectedVisibility())
|
|
attr |= LTO_SYMBOL_SCOPE_PROTECTED;
|
|
else if (def->hasExternalLinkage() || def->hasWeakLinkage() ||
|
|
def->hasLinkOnceLinkage() || def->hasCommonLinkage() ||
|
|
def->hasLinkerPrivateWeakLinkage())
|
|
attr |= LTO_SYMBOL_SCOPE_DEFAULT;
|
|
else if (def->hasLinkerPrivateWeakDefAutoLinkage())
|
|
attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
|
|
else
|
|
attr |= LTO_SYMBOL_SCOPE_INTERNAL;
|
|
|
|
// add to table of symbols
|
|
NameAndAttributes info;
|
|
StringSet::value_type &entry = _defines.GetOrCreateValue(Buffer);
|
|
entry.setValue(1);
|
|
|
|
StringRef Name = entry.getKey();
|
|
info.name = Name.data();
|
|
assert(info.name[Name.size()] == '\0');
|
|
info.attributes = (lto_symbol_attributes)attr;
|
|
_symbols.push_back(info);
|
|
}
|
|
|
|
void LTOModule::addAsmGlobalSymbol(const char *name,
|
|
lto_symbol_attributes scope) {
|
|
StringSet::value_type &entry = _defines.GetOrCreateValue(name);
|
|
|
|
// only add new define if not already defined
|
|
if (entry.getValue())
|
|
return;
|
|
|
|
entry.setValue(1);
|
|
const char *symbolName = entry.getKey().data();
|
|
uint32_t attr = LTO_SYMBOL_DEFINITION_REGULAR;
|
|
attr |= scope;
|
|
NameAndAttributes info;
|
|
info.name = symbolName;
|
|
info.attributes = (lto_symbol_attributes)attr;
|
|
_symbols.push_back(info);
|
|
}
|
|
|
|
void LTOModule::addAsmGlobalSymbolUndef(const char *name) {
|
|
StringMap<NameAndAttributes>::value_type &entry =
|
|
_undefines.GetOrCreateValue(name);
|
|
|
|
_asm_undefines.push_back(entry.getKey().data());
|
|
|
|
// we already have the symbol
|
|
if (entry.getValue().name)
|
|
return;
|
|
|
|
uint32_t attr = LTO_SYMBOL_DEFINITION_UNDEFINED;;
|
|
attr |= LTO_SYMBOL_SCOPE_DEFAULT;
|
|
NameAndAttributes info;
|
|
info.name = entry.getKey().data();
|
|
info.attributes = (lto_symbol_attributes)attr;
|
|
|
|
entry.setValue(info);
|
|
}
|
|
|
|
void LTOModule::addPotentialUndefinedSymbol(GlobalValue *decl,
|
|
Mangler &mangler) {
|
|
// ignore all llvm.* symbols
|
|
if (decl->getName().startswith("llvm."))
|
|
return;
|
|
|
|
// ignore all aliases
|
|
if (isa<GlobalAlias>(decl))
|
|
return;
|
|
|
|
SmallString<64> name;
|
|
mangler.getNameWithPrefix(name, decl, false);
|
|
|
|
StringMap<NameAndAttributes>::value_type &entry =
|
|
_undefines.GetOrCreateValue(name);
|
|
|
|
// we already have the symbol
|
|
if (entry.getValue().name)
|
|
return;
|
|
|
|
NameAndAttributes info;
|
|
|
|
info.name = entry.getKey().data();
|
|
if (decl->hasExternalWeakLinkage())
|
|
info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
|
|
else
|
|
info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
|
|
|
|
entry.setValue(info);
|
|
}
|
|
|
|
|
|
namespace {
|
|
class RecordStreamer : public MCStreamer {
|
|
public:
|
|
enum State { NeverSeen, Global, Defined, DefinedGlobal, Used};
|
|
|
|
private:
|
|
StringMap<State> Symbols;
|
|
|
|
void markDefined(const MCSymbol &Symbol) {
|
|
State &S = Symbols[Symbol.getName()];
|
|
switch (S) {
|
|
case DefinedGlobal:
|
|
case Global:
|
|
S = DefinedGlobal;
|
|
break;
|
|
case NeverSeen:
|
|
case Defined:
|
|
case Used:
|
|
S = Defined;
|
|
break;
|
|
}
|
|
}
|
|
void markGlobal(const MCSymbol &Symbol) {
|
|
State &S = Symbols[Symbol.getName()];
|
|
switch (S) {
|
|
case DefinedGlobal:
|
|
case Defined:
|
|
S = DefinedGlobal;
|
|
break;
|
|
|
|
case NeverSeen:
|
|
case Global:
|
|
case Used:
|
|
S = Global;
|
|
break;
|
|
}
|
|
}
|
|
void markUsed(const MCSymbol &Symbol) {
|
|
State &S = Symbols[Symbol.getName()];
|
|
switch (S) {
|
|
case DefinedGlobal:
|
|
case Defined:
|
|
case Global:
|
|
break;
|
|
|
|
case NeverSeen:
|
|
case Used:
|
|
S = Used;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// FIXME: mostly copied for the obj streamer.
|
|
void AddValueSymbols(const MCExpr *Value) {
|
|
switch (Value->getKind()) {
|
|
case MCExpr::Target:
|
|
// FIXME: What should we do in here?
|
|
break;
|
|
|
|
case MCExpr::Constant:
|
|
break;
|
|
|
|
case MCExpr::Binary: {
|
|
const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
|
|
AddValueSymbols(BE->getLHS());
|
|
AddValueSymbols(BE->getRHS());
|
|
break;
|
|
}
|
|
|
|
case MCExpr::SymbolRef:
|
|
markUsed(cast<MCSymbolRefExpr>(Value)->getSymbol());
|
|
break;
|
|
|
|
case MCExpr::Unary:
|
|
AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
|
|
break;
|
|
}
|
|
}
|
|
|
|
public:
|
|
typedef StringMap<State>::const_iterator const_iterator;
|
|
|
|
const_iterator begin() {
|
|
return Symbols.begin();
|
|
}
|
|
|
|
const_iterator end() {
|
|
return Symbols.end();
|
|
}
|
|
|
|
RecordStreamer(MCContext &Context) : MCStreamer(Context) {}
|
|
|
|
virtual void ChangeSection(const MCSection *Section) {}
|
|
virtual void InitSections() {}
|
|
virtual void EmitLabel(MCSymbol *Symbol) {
|
|
Symbol->setSection(*getCurrentSection());
|
|
markDefined(*Symbol);
|
|
}
|
|
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
|
|
virtual void EmitThumbFunc(MCSymbol *Func) {}
|
|
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
|
|
// FIXME: should we handle aliases?
|
|
markDefined(*Symbol);
|
|
}
|
|
virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) {
|
|
if (Attribute == MCSA_Global)
|
|
markGlobal(*Symbol);
|
|
}
|
|
virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
|
|
virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
|
|
virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
|
|
virtual void EmitCOFFSymbolStorageClass(int StorageClass) {}
|
|
virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
|
|
unsigned Size , unsigned ByteAlignment) {
|
|
markDefined(*Symbol);
|
|
}
|
|
virtual void EmitCOFFSymbolType(int Type) {}
|
|
virtual void EndCOFFSymbolDef() {}
|
|
virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) {
|
|
markDefined(*Symbol);
|
|
}
|
|
virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
|
|
virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {}
|
|
virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) {}
|
|
virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {}
|
|
virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
|
|
unsigned AddrSpace) {}
|
|
virtual void EmitULEB128Value(const MCExpr *Value) {}
|
|
virtual void EmitSLEB128Value(const MCExpr *Value) {}
|
|
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
|
|
unsigned ValueSize,
|
|
unsigned MaxBytesToEmit) {}
|
|
virtual void EmitCodeAlignment(unsigned ByteAlignment,
|
|
unsigned MaxBytesToEmit) {}
|
|
virtual void EmitValueToOffset(const MCExpr *Offset,
|
|
unsigned char Value ) {}
|
|
virtual void EmitFileDirective(StringRef Filename) {}
|
|
virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
|
|
const MCSymbol *LastLabel,
|
|
const MCSymbol *Label,
|
|
unsigned PointerSize) {}
|
|
|
|
virtual void EmitInstruction(const MCInst &Inst) {
|
|
// Scan for values.
|
|
for (unsigned i = Inst.getNumOperands(); i--; )
|
|
if (Inst.getOperand(i).isExpr())
|
|
AddValueSymbols(Inst.getOperand(i).getExpr());
|
|
}
|
|
virtual void Finish() {}
|
|
};
|
|
}
|
|
|
|
bool LTOModule::addAsmGlobalSymbols(MCContext &Context) {
|
|
const std::string &inlineAsm = _module->getModuleInlineAsm();
|
|
|
|
OwningPtr<RecordStreamer> Streamer(new RecordStreamer(Context));
|
|
MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(inlineAsm);
|
|
SourceMgr SrcMgr;
|
|
SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
|
|
OwningPtr<MCAsmParser> Parser(createMCAsmParser(_target->getTarget(), SrcMgr,
|
|
Context, *Streamer,
|
|
*_target->getMCAsmInfo()));
|
|
OwningPtr<MCSubtargetInfo> STI(_target->getTarget().
|
|
createMCSubtargetInfo(_target->getTargetTriple(),
|
|
_target->getTargetCPU(),
|
|
_target->getTargetFeatureString()));
|
|
OwningPtr<MCTargetAsmParser>
|
|
TAP(_target->getTarget().createMCAsmParser(*STI, *Parser.get()));
|
|
Parser->setTargetParser(*TAP);
|
|
int Res = Parser->Run(false);
|
|
if (Res)
|
|
return true;
|
|
|
|
for (RecordStreamer::const_iterator i = Streamer->begin(),
|
|
e = Streamer->end(); i != e; ++i) {
|
|
StringRef Key = i->first();
|
|
RecordStreamer::State Value = i->second;
|
|
if (Value == RecordStreamer::DefinedGlobal)
|
|
addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_DEFAULT);
|
|
else if (Value == RecordStreamer::Defined)
|
|
addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_INTERNAL);
|
|
else if (Value == RecordStreamer::Global ||
|
|
Value == RecordStreamer::Used)
|
|
addAsmGlobalSymbolUndef(Key.data());
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool isDeclaration(const GlobalValue &V) {
|
|
if (V.hasAvailableExternallyLinkage())
|
|
return true;
|
|
if (V.isMaterializable())
|
|
return false;
|
|
return V.isDeclaration();
|
|
}
|
|
|
|
static bool isAliasToDeclaration(const GlobalAlias &V) {
|
|
return isDeclaration(*V.getAliasedGlobal());
|
|
}
|
|
|
|
bool LTOModule::ParseSymbols() {
|
|
// Use mangler to add GlobalPrefix to names to match linker names.
|
|
MCContext Context(*_target->getMCAsmInfo(), *_target->getRegisterInfo(),NULL);
|
|
Mangler mangler(Context, *_target->getTargetData());
|
|
|
|
// add functions
|
|
for (Module::iterator f = _module->begin(); f != _module->end(); ++f) {
|
|
if (isDeclaration(*f))
|
|
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 (isDeclaration(*v))
|
|
addPotentialUndefinedSymbol(v, mangler);
|
|
else
|
|
addDefinedDataSymbol(v, mangler);
|
|
}
|
|
|
|
// add asm globals
|
|
if (addAsmGlobalSymbols(Context))
|
|
return true;
|
|
|
|
// add aliases
|
|
for (Module::alias_iterator i = _module->alias_begin(),
|
|
e = _module->alias_end(); i != e; ++i) {
|
|
if (isAliasToDeclaration(*i))
|
|
addPotentialUndefinedSymbol(i, mangler);
|
|
else
|
|
addDefinedDataSymbol(i, mangler);
|
|
}
|
|
|
|
// make symbols for all undefines
|
|
for (StringMap<NameAndAttributes>::iterator it=_undefines.begin();
|
|
it != _undefines.end(); ++it) {
|
|
// if this symbol also has a definition, then don't make an undefine
|
|
// because it is a tentative definition
|
|
if (_defines.count(it->getKey()) == 0) {
|
|
NameAndAttributes info = it->getValue();
|
|
_symbols.push_back(info);
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
uint32_t LTOModule::getSymbolCount() {
|
|
return _symbols.size();
|
|
}
|
|
|
|
|
|
lto_symbol_attributes LTOModule::getSymbolAttributes(uint32_t index) {
|
|
if (index < _symbols.size())
|
|
return _symbols[index].attributes;
|
|
else
|
|
return lto_symbol_attributes(0);
|
|
}
|
|
|
|
const char *LTOModule::getSymbolName(uint32_t index) {
|
|
if (index < _symbols.size())
|
|
return _symbols[index].name;
|
|
else
|
|
return NULL;
|
|
}
|