{
InitializeAllTargets();
InitializeAllAsmPrinters();
- InitializeAllAsmParsers();
}
LTOCodeGenerator::~LTOCodeGenerator()
bool LTOCodeGenerator::addModule(LTOModule* mod, std::string& errMsg)
{
- return _linker.LinkInModule(mod->getLLVVMModule(), &errMsg);
+ bool ret = _linker.LinkInModule(mod->getLLVVMModule(), &errMsg);
+
+ const std::vector<const char*> &undefs = mod->getAsmUndefinedRefs();
+ for (int i = 0, e = undefs.size(); i != e; ++i)
+ _asmUndefinedRefs[undefs[i]] = 1;
+
+ return ret;
}
return false;
}
+void LTOCodeGenerator::applyRestriction(GlobalValue &GV,
+ std::vector<const char*> &mustPreserveList,
+ SmallPtrSet<GlobalValue*, 8> &asmUsed,
+ Mangler &mangler) {
+ SmallString<64> Buffer;
+ mangler.getNameWithPrefix(Buffer, &GV, false);
+
+ if (GV.isDeclaration())
+ return;
+ if (_mustPreserveSymbols.count(Buffer))
+ mustPreserveList.push_back(GV.getName().data());
+ if (_asmUndefinedRefs.count(Buffer))
+ asmUsed.insert(&GV);
+}
+
+static void findUsedValues(GlobalVariable *LLVMUsed,
+ SmallPtrSet<GlobalValue*, 8> &UsedValues) {
+ if (LLVMUsed == 0) return;
+
+ ConstantArray *Inits = dyn_cast<ConstantArray>(LLVMUsed->getInitializer());
+ if (Inits == 0) return;
+
+ for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i)
+ if (GlobalValue *GV =
+ dyn_cast<GlobalValue>(Inits->getOperand(i)->stripPointerCasts()))
+ UsedValues.insert(GV);
+}
+
void LTOCodeGenerator::applyScopeRestrictions() {
if (_scopeRestrictionsDone) return;
Module *mergedModule = _linker.getModule();
passes.add(createVerifierPass());
// mark which symbols can not be internalized
- if (!_mustPreserveSymbols.empty()) {
- MCContext Context(*_target->getMCAsmInfo(), NULL);
- Mangler mangler(Context, *_target->getTargetData());
- std::vector<const char*> mustPreserveList;
- SmallString<64> Buffer;
- for (Module::iterator f = mergedModule->begin(),
- e = mergedModule->end(); f != e; ++f) {
- Buffer.clear();
- mangler.getNameWithPrefix(Buffer, f, false);
- if (!f->isDeclaration() &&
- _mustPreserveSymbols.count(Buffer))
- mustPreserveList.push_back(f->getName().data());
- }
- for (Module::global_iterator v = mergedModule->global_begin(),
- e = mergedModule->global_end(); v != e; ++v) {
- Buffer.clear();
- mangler.getNameWithPrefix(Buffer, v, false);
- if (!v->isDeclaration() &&
- _mustPreserveSymbols.count(Buffer))
- mustPreserveList.push_back(v->getName().data());
- }
- for (Module::alias_iterator a = mergedModule->alias_begin(),
- e = mergedModule->alias_end(); a != e; ++a) {
- Buffer.clear();
- mangler.getNameWithPrefix(Buffer, a, false);
- if (!a->isDeclaration() &&
- _mustPreserveSymbols.count(Buffer))
- mustPreserveList.push_back(a->getName().data());
- }
- passes.add(createInternalizePass(mustPreserveList));
+ MCContext Context(*_target->getMCAsmInfo(), NULL);
+ Mangler mangler(Context, *_target->getTargetData());
+ std::vector<const char*> mustPreserveList;
+ SmallPtrSet<GlobalValue*, 8> asmUsed;
+
+ for (Module::iterator f = mergedModule->begin(),
+ e = mergedModule->end(); f != e; ++f)
+ applyRestriction(*f, mustPreserveList, asmUsed, mangler);
+ for (Module::global_iterator v = mergedModule->global_begin(),
+ e = mergedModule->global_end(); v != e; ++v)
+ applyRestriction(*v, mustPreserveList, asmUsed, mangler);
+ for (Module::alias_iterator a = mergedModule->alias_begin(),
+ e = mergedModule->alias_end(); a != e; ++a)
+ applyRestriction(*a, mustPreserveList, asmUsed, mangler);
+
+ GlobalVariable *LLVMCompilerUsed =
+ mergedModule->getGlobalVariable("llvm.compiler.used");
+ findUsedValues(LLVMCompilerUsed, asmUsed);
+ if (LLVMCompilerUsed)
+ LLVMCompilerUsed->eraseFromParent();
+
+ const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(_context);
+ std::vector<Constant*> asmUsed2;
+ for (SmallPtrSet<GlobalValue*, 16>::const_iterator i = asmUsed.begin(),
+ e = asmUsed.end(); i !=e; ++i) {
+ GlobalValue *GV = *i;
+ Constant *c = ConstantExpr::getBitCast(GV, i8PTy);
+ asmUsed2.push_back(c);
}
-
+
+ llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, asmUsed2.size());
+ LLVMCompilerUsed =
+ new llvm::GlobalVariable(*mergedModule, ATy, false,
+ llvm::GlobalValue::AppendingLinkage,
+ llvm::ConstantArray::get(ATy, asmUsed2),
+ "llvm.compiler.used");
+
+ LLVMCompilerUsed->setSection("llvm.metadata");
+
+ passes.add(createInternalizePass(mustPreserveList));
+
// apply scope restrictions
passes.run(*mergedModule);
#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"
LTOModule::LTOModule(Module *m, TargetMachine *t)
- : _module(m), _target(t), _symbolsParsed(false)
+ : _module(m), _target(t)
{
}
LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer,
std::string &errMsg) {
- InitializeAllTargets();
+ static bool Initialized = false;
+ if (!Initialized) {
+ InitializeAllTargets();
+ InitializeAllAsmParsers();
+ Initialized = true;
+ }
// parse bitcode buffer
OwningPtr<Module> m(ParseBitcodeFile(buffer, getGlobalContext(), &errMsg));
Features.getDefaultSubtargetFeatures("" /* cpu */, llvm::Triple(Triple));
std::string FeatureStr = Features.getString();
TargetMachine *target = march->createTargetMachine(Triple, FeatureStr);
- return new LTOModule(m.take(), target);
+ LTOModule *Ret = new LTOModule(m.take(), target);
+ bool Err = Ret->ParseSymbols();
+ if (Err) {
+ delete Ret;
+ return NULL;
+ }
+ return Ret;
}
_symbols.push_back(info);
}
-void LTOModule::addAsmGlobalSymbol(const char *name) {
+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
entry.setValue(1);
const char *symbolName = entry.getKey().data();
uint32_t attr = LTO_SYMBOL_DEFINITION_REGULAR;
- attr |= LTO_SYMBOL_SCOPE_DEFAULT;
+ 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
}
}
-void LTOModule::lazyParseSymbols() {
- if (_symbolsParsed)
- return;
+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();
+ }
- _symbolsParsed = true;
+ 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,
+ bool isPCRel, unsigned AddrSpace) {}
+ virtual void EmitULEB128Value(const MCExpr *Value,
+ unsigned AddrSpace = 0) {}
+ virtual void EmitSLEB128Value(const MCExpr *Value,
+ unsigned AddrSpace = 0) {}
+ 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;
+}
+
+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 asm globals
- const std::string &inlineAsm = _module->getModuleInlineAsm();
- const std::string glbl = ".globl";
- std::string asmSymbolName;
- std::string::size_type pos = inlineAsm.find(glbl, 0);
- while (pos != std::string::npos) {
- // eat .globl
- pos = pos + 6;
-
- // skip white space between .globl and symbol name
- std::string::size_type pbegin = inlineAsm.find_first_not_of(' ', pos);
- if (pbegin == std::string::npos)
- break;
-
- // find end-of-line
- std::string::size_type pend = inlineAsm.find_first_of('\n', pbegin);
- if (pend == std::string::npos)
- break;
-
- asmSymbolName.assign(inlineAsm, pbegin, pend - pbegin);
- addAsmGlobalSymbol(asmSymbolName.c_str());
-
- // search next .globl
- pos = inlineAsm.find(glbl, pend);
- }
+ if (addAsmGlobalSymbols(Context))
+ return true;
// add aliases
for (Module::alias_iterator i = _module->alias_begin(),
_symbols.push_back(info);
}
}
+ return false;
}
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
projects / oota-llvm.git / commitdiff