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llvm-6502/tools/lto/LTOModule.cpp
Rafael Espindola debd7e4e8b Simplify the handling of pcrel relocations on ELF. Now we do the right thing 
for all symbol differences and can drop the old EmitPCRelSymbolValue
method.

This also make getExprForFDESymbol on ELF equal to the one on MachO, and it
can be made non-virtual.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130634 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-01 03:50:49 +00:00

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//===-- 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/Target/SubtargetFeature.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/MCSymbol.h"
#include "llvm/Target/TargetAsmParser.h"
#include "llvm/Target/TargetMachine.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();
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("" /* cpu */, llvm::Triple(Triple));
std::string FeatureStr = Features.getString();
TargetMachine *target = march->createTargetMachine(Triple, 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->getAsString();
return true;
}
}
}
}
return false;
}
// Parse i386/ppc ObjC class data structure.
void LTOModule::addObjCClass(GlobalVariable *clgv) {
if (ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer())) {
// second slot in __OBJC,__class is pointer to superclass name
std::string superclassName;
if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
NameAndAttributes info;
StringMap<NameAndAttributes>::value_type &entry =
_undefines.GetOrCreateValue(superclassName.c_str());
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.c_str());
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.c_str());
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.c_str());
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.c_str());
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.c_str());
// 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) {}
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<TargetAsmParser>
TAP(_target->getTarget().createAsmParser(*Parser.get(), *_target.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(), 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;
}
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