third_party/LLVM/lib/MC/MCDisassembler/EDDisassembler.cpp - SwiftShader - Git at Google

 //===-EDDisassembler.cpp - LLVM Enhanced Disassembler ---------------------===//
 //
 //                     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 Enhanced Disassembly library's  disassembler class.
 // The disassembler is responsible for vending individual instructions according
 // to a given architecture and disassembly syntax.
 //
 //===----------------------------------------------------------------------===//

 #include "EDDisassembler.h"
 #include "EDInst.h"
 #include "llvm/MC/EDInstInfo.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCDisassembler.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCInstPrinter.h"
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/MC/MCParser/AsmLexer.h"
 #include "llvm/MC/MCParser/MCAsmParser.h"
 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
 #include "llvm/MC/MCTargetAsmLexer.h"
 #include "llvm/MC/MCTargetAsmParser.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/MemoryObject.h"
 #include "llvm/Support/SourceMgr.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/TargetSelect.h"
 using namespace llvm;

 bool EDDisassembler::sInitialized = false;
 EDDisassembler::DisassemblerMap_t EDDisassembler::sDisassemblers;

 struct TripleMap {
   Triple::ArchType Arch;
   const char *String;
 };

 static struct TripleMap triplemap[] = {
   { Triple::x86,          "i386-unknown-unknown"    },
   { Triple::x86_64,       "x86_64-unknown-unknown"  },
   { Triple::arm,          "arm-unknown-unknown"     },
   { Triple::thumb,        "thumb-unknown-unknown"   },
   { Triple::InvalidArch,  NULL,                     }
 };

 /// infoFromArch - Returns the TripleMap corresponding to a given architecture,
 ///   or NULL if there is an error
 ///
 /// @arg arch - The Triple::ArchType for the desired architecture
 static const char *tripleFromArch(Triple::ArchType arch) {
   unsigned int infoIndex;

   for (infoIndex = 0; triplemap[infoIndex].String != NULL; ++infoIndex) {
     if (arch == triplemap[infoIndex].Arch)
       return triplemap[infoIndex].String;
   }

   return NULL;
 }

 /// getLLVMSyntaxVariant - gets the constant to use to get an assembly printer
 ///   for the desired assembly syntax, suitable for passing to
 ///   Target::createMCInstPrinter()
 ///
 /// @arg arch   - The target architecture
 /// @arg syntax - The assembly syntax in sd form
 static int getLLVMSyntaxVariant(Triple::ArchType arch,
                                 EDDisassembler::AssemblySyntax syntax) {
   switch (syntax) {
   default:
     return -1;
   // Mappings below from X86AsmPrinter.cpp
   case EDDisassembler::kEDAssemblySyntaxX86ATT:
     if (arch == Triple::x86 || arch == Triple::x86_64)
       return 0;
     else
       return -1;
   case EDDisassembler::kEDAssemblySyntaxX86Intel:
     if (arch == Triple::x86 || arch == Triple::x86_64)
       return 1;
     else
       return -1;
   case EDDisassembler::kEDAssemblySyntaxARMUAL:
     if (arch == Triple::arm || arch == Triple::thumb)
       return 0;
     else
       return -1;
   }
 }

 void EDDisassembler::initialize() {
   if (sInitialized)
     return;

   sInitialized = true;

   InitializeAllTargetInfos();
   InitializeAllTargetMCs();
   InitializeAllAsmParsers();
   InitializeAllDisassemblers();
 }

 #undef BRINGUP_TARGET

 EDDisassembler *EDDisassembler::getDisassembler(Triple::ArchType arch,
                                                 AssemblySyntax syntax) {
   CPUKey key;
   key.Arch = arch;
   key.Syntax = syntax;

   EDDisassembler::DisassemblerMap_t::iterator i = sDisassemblers.find(key);

   if (i != sDisassemblers.end()) {
     return i->second;
   } else {
     EDDisassembler* sdd = new EDDisassembler(key);
     if (!sdd->valid()) {
       delete sdd;
       return NULL;
     }

     sDisassemblers[key] = sdd;

     return sdd;
   }

   return NULL;
 }

 EDDisassembler *EDDisassembler::getDisassembler(StringRef str,
                                                 AssemblySyntax syntax) {
   return getDisassembler(Triple(str).getArch(), syntax);
 }

 EDDisassembler::EDDisassembler(CPUKey &key) :
   Valid(false),
   HasSemantics(false),
   ErrorStream(nulls()),
   Key(key) {
   const char *triple = tripleFromArch(key.Arch);

   if (!triple)
     return;

   LLVMSyntaxVariant = getLLVMSyntaxVariant(key.Arch, key.Syntax);

   if (LLVMSyntaxVariant < 0)
     return;

   std::string tripleString(triple);
   std::string errorString;

   Tgt = TargetRegistry::lookupTarget(tripleString,
                                      errorString);

   if (!Tgt)
     return;

   MRI.reset(Tgt->createMCRegInfo(tripleString));

   if (!MRI)
     return;

   initMaps(*MRI);

   AsmInfo.reset(Tgt->createMCAsmInfo(tripleString));

   if (!AsmInfo)
     return;

   STI.reset(Tgt->createMCSubtargetInfo(tripleString, "", ""));

   if (!STI)
     return;

   Disassembler.reset(Tgt->createMCDisassembler(*STI));

   if (!Disassembler)
     return;

   InstInfos = Disassembler->getEDInfo();

   InstString.reset(new std::string);
   InstStream.reset(new raw_string_ostream(*InstString));
   InstPrinter.reset(Tgt->createMCInstPrinter(LLVMSyntaxVariant, *AsmInfo, *STI));

   if (!InstPrinter)
     return;

   GenericAsmLexer.reset(new AsmLexer(*AsmInfo));
   SpecificAsmLexer.reset(Tgt->createMCAsmLexer(*MRI, *AsmInfo));
   SpecificAsmLexer->InstallLexer(*GenericAsmLexer);

   initMaps(*MRI);

   Valid = true;
 }

 EDDisassembler::~EDDisassembler() {
   if (!valid())
     return;
 }

 namespace {
   /// EDMemoryObject - a subclass of MemoryObject that allows use of a callback
   ///   as provided by the sd interface.  See MemoryObject.
   class EDMemoryObject : public llvm::MemoryObject {
   private:
     EDByteReaderCallback Callback;
     void *Arg;
   public:
     EDMemoryObject(EDByteReaderCallback callback,
                    void *arg) : Callback(callback), Arg(arg) { }
     ~EDMemoryObject() { }
     uint64_t getBase() const { return 0x0; }
     uint64_t getExtent() const { return (uint64_t)-1; }
     int readByte(uint64_t address, uint8_t *ptr) const {
       if (!Callback)
         return -1;

       if (Callback(ptr, address, Arg))
         return -1;

       return 0;
     }
   };
 }

 EDInst *EDDisassembler::createInst(EDByteReaderCallback byteReader,
                                    uint64_t address,
                                    void *arg) {
   EDMemoryObject memoryObject(byteReader, arg);

   MCInst* inst = new MCInst;
   uint64_t byteSize;

   MCDisassembler::DecodeStatus S;
   S = Disassembler->getInstruction(*inst, byteSize, memoryObject, address,
                                    ErrorStream, nulls());
   switch (S) {
   case MCDisassembler::Fail:
   case MCDisassembler::SoftFail:
     // FIXME: Do something different on soft failure mode?
     delete inst;
     return NULL;

   case MCDisassembler::Success: {
     const llvm::EDInstInfo *thisInstInfo = NULL;

     if (InstInfos) {
       thisInstInfo = &InstInfos[inst->getOpcode()];
     }

     EDInst* sdInst = new EDInst(inst, byteSize, *this, thisInstInfo);
     return sdInst;
   }
   }
   return NULL;
 }

 void EDDisassembler::initMaps(const MCRegisterInfo &registerInfo) {
   unsigned numRegisters = registerInfo.getNumRegs();
   unsigned registerIndex;

   for (registerIndex = 0; registerIndex < numRegisters; ++registerIndex) {
     const char* registerName = registerInfo.get(registerIndex).Name;

     RegVec.push_back(registerName);
     RegRMap[registerName] = registerIndex;
   }

   switch (Key.Arch) {
   default:
     break;
   case Triple::x86:
   case Triple::x86_64:
     stackPointers.insert(registerIDWithName("SP"));
     stackPointers.insert(registerIDWithName("ESP"));
     stackPointers.insert(registerIDWithName("RSP"));

     programCounters.insert(registerIDWithName("IP"));
     programCounters.insert(registerIDWithName("EIP"));
     programCounters.insert(registerIDWithName("RIP"));
     break;
   case Triple::arm:
   case Triple::thumb:
     stackPointers.insert(registerIDWithName("SP"));

     programCounters.insert(registerIDWithName("PC"));
     break;
   }
 }

 const char *EDDisassembler::nameWithRegisterID(unsigned registerID) const {
   if (registerID >= RegVec.size())
     return NULL;
   else
     return RegVec[registerID].c_str();
 }

 unsigned EDDisassembler::registerIDWithName(const char *name) const {
   regrmap_t::const_iterator iter = RegRMap.find(std::string(name));
   if (iter == RegRMap.end())
     return 0;
   else
     return (*iter).second;
 }

 bool EDDisassembler::registerIsStackPointer(unsigned registerID) {
   return (stackPointers.find(registerID) != stackPointers.end());
 }

 bool EDDisassembler::registerIsProgramCounter(unsigned registerID) {
   return (programCounters.find(registerID) != programCounters.end());
 }

 int EDDisassembler::printInst(std::string &str, MCInst &inst) {
   PrinterMutex.acquire();

   InstPrinter->printInst(&inst, *InstStream, "");
   InstStream->flush();
   str = *InstString;
   InstString->clear();

   PrinterMutex.release();

   return 0;
 }

 static void diag_handler(const SMDiagnostic &diag,
                          void *context)
 {
   if (context) {
     EDDisassembler *disassembler = static_cast<EDDisassembler*>(context);
     diag.Print("", disassembler->ErrorStream);
   }
 }

 int EDDisassembler::parseInst(SmallVectorImpl<MCParsedAsmOperand*> &operands,
                               SmallVectorImpl<AsmToken> &tokens,
                               const std::string &str) {
   int ret = 0;

   switch (Key.Arch) {
   default:
     return -1;
   case Triple::x86:
   case Triple::x86_64:
   case Triple::arm:
   case Triple::thumb:
     break;
   }

   const char *cStr = str.c_str();
   MemoryBuffer *buf = MemoryBuffer::getMemBuffer(cStr, cStr + strlen(cStr));

   StringRef instName;
   SMLoc instLoc;

   SourceMgr sourceMgr;
   sourceMgr.setDiagHandler(diag_handler, static_cast<void*>(this));
   sourceMgr.AddNewSourceBuffer(buf, SMLoc()); // ownership of buf handed over
   MCContext context(*AsmInfo, *MRI, NULL);
   OwningPtr<MCStreamer> streamer(createNullStreamer(context));
   OwningPtr<MCAsmParser> genericParser(createMCAsmParser(sourceMgr,
                                                          context, *streamer,
                                                          *AsmInfo));

   StringRef triple = tripleFromArch(Key.Arch);
   OwningPtr<MCSubtargetInfo> STI(Tgt->createMCSubtargetInfo(triple, "", ""));
   OwningPtr<MCTargetAsmParser>
     TargetParser(Tgt->createMCAsmParser(*STI, *genericParser));

   AsmToken OpcodeToken = genericParser->Lex();
   AsmToken NextToken = genericParser->Lex();  // consume next token, because specificParser expects us to

   if (OpcodeToken.is(AsmToken::Identifier)) {
     instName = OpcodeToken.getString();
     instLoc = OpcodeToken.getLoc();

     if (NextToken.isNot(AsmToken::Eof) &&
         TargetParser->ParseInstruction(instName, instLoc, operands))
       ret = -1;
   } else {
     ret = -1;
   }

   ParserMutex.acquire();

   if (!ret) {
     GenericAsmLexer->setBuffer(buf);

     while (SpecificAsmLexer->Lex(),
            SpecificAsmLexer->isNot(AsmToken::Eof) &&
            SpecificAsmLexer->isNot(AsmToken::EndOfStatement)) {
       if (SpecificAsmLexer->is(AsmToken::Error)) {
         ret = -1;
         break;
       }
       tokens.push_back(SpecificAsmLexer->getTok());
     }
   }

   ParserMutex.release();

   return ret;
 }

 int EDDisassembler::llvmSyntaxVariant() const {
   return LLVMSyntaxVariant;
 }
	//===-EDDisassembler.cpp - LLVM Enhanced Disassembler ---------------------===//
	//
	// 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 Enhanced Disassembly library's disassembler class.
	// The disassembler is responsible for vending individual instructions according
	// to a given architecture and disassembly syntax.
	//
	//===----------------------------------------------------------------------===//

	#include "EDDisassembler.h"
	#include "EDInst.h"
	#include "llvm/MC/EDInstInfo.h"
	#include "llvm/MC/MCAsmInfo.h"
	#include "llvm/MC/MCContext.h"
	#include "llvm/MC/MCDisassembler.h"
	#include "llvm/MC/MCExpr.h"
	#include "llvm/MC/MCInst.h"
	#include "llvm/MC/MCInstPrinter.h"
	#include "llvm/MC/MCRegisterInfo.h"
	#include "llvm/MC/MCStreamer.h"
	#include "llvm/MC/MCSubtargetInfo.h"
	#include "llvm/MC/MCParser/AsmLexer.h"
	#include "llvm/MC/MCParser/MCAsmParser.h"
	#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
	#include "llvm/MC/MCTargetAsmLexer.h"
	#include "llvm/MC/MCTargetAsmParser.h"
	#include "llvm/Support/MemoryBuffer.h"
	#include "llvm/Support/MemoryObject.h"
	#include "llvm/Support/SourceMgr.h"
	#include "llvm/Support/TargetRegistry.h"
	#include "llvm/Support/TargetSelect.h"
	using namespace llvm;

	bool EDDisassembler::sInitialized = false;
	EDDisassembler::DisassemblerMap_t EDDisassembler::sDisassemblers;

	struct TripleMap {
	Triple::ArchType Arch;
	const char *String;
	};

	static struct TripleMap triplemap[] = {
	{ Triple::x86, "i386-unknown-unknown" },
	{ Triple::x86_64, "x86_64-unknown-unknown" },
	{ Triple::arm, "arm-unknown-unknown" },
	{ Triple::thumb, "thumb-unknown-unknown" },
	{ Triple::InvalidArch, NULL, }
	};

	/// infoFromArch - Returns the TripleMap corresponding to a given architecture,
	/// or NULL if there is an error
	///
	/// @arg arch - The Triple::ArchType for the desired architecture
	static const char *tripleFromArch(Triple::ArchType arch) {
	unsigned int infoIndex;

	for (infoIndex = 0; triplemap[infoIndex].String != NULL; ++infoIndex) {
	if (arch == triplemap[infoIndex].Arch)
	return triplemap[infoIndex].String;
	}

	return NULL;
	}

	/// getLLVMSyntaxVariant - gets the constant to use to get an assembly printer
	/// for the desired assembly syntax, suitable for passing to
	/// Target::createMCInstPrinter()
	///
	/// @arg arch - The target architecture
	/// @arg syntax - The assembly syntax in sd form
	static int getLLVMSyntaxVariant(Triple::ArchType arch,
	EDDisassembler::AssemblySyntax syntax) {
	switch (syntax) {
	default:
	return -1;
	// Mappings below from X86AsmPrinter.cpp
	case EDDisassembler::kEDAssemblySyntaxX86ATT:
	if (arch == Triple::x86 \|\| arch == Triple::x86_64)
	return 0;
	else
	return -1;
	case EDDisassembler::kEDAssemblySyntaxX86Intel:
	if (arch == Triple::x86 \|\| arch == Triple::x86_64)
	return 1;
	else
	return -1;
	case EDDisassembler::kEDAssemblySyntaxARMUAL:
	if (arch == Triple::arm \|\| arch == Triple::thumb)
	return 0;
	else
	return -1;
	}
	}

	void EDDisassembler::initialize() {
	if (sInitialized)
	return;

	sInitialized = true;

	InitializeAllTargetInfos();
	InitializeAllTargetMCs();
	InitializeAllAsmParsers();
	InitializeAllDisassemblers();
	}

	#undef BRINGUP_TARGET

	EDDisassembler *EDDisassembler::getDisassembler(Triple::ArchType arch,
	AssemblySyntax syntax) {
	CPUKey key;
	key.Arch = arch;
	key.Syntax = syntax;

	EDDisassembler::DisassemblerMap_t::iterator i = sDisassemblers.find(key);

	if (i != sDisassemblers.end()) {
	return i->second;
	} else {
	EDDisassembler* sdd = new EDDisassembler(key);
	if (!sdd->valid()) {
	delete sdd;
	return NULL;
	}

	sDisassemblers[key] = sdd;

	return sdd;
	}

	return NULL;
	}

	EDDisassembler *EDDisassembler::getDisassembler(StringRef str,
	AssemblySyntax syntax) {
	return getDisassembler(Triple(str).getArch(), syntax);
	}

	EDDisassembler::EDDisassembler(CPUKey &key) :
	Valid(false),
	HasSemantics(false),
	ErrorStream(nulls()),
	Key(key) {
	const char *triple = tripleFromArch(key.Arch);

	if (!triple)
	return;

	LLVMSyntaxVariant = getLLVMSyntaxVariant(key.Arch, key.Syntax);

	if (LLVMSyntaxVariant < 0)
	return;

	std::string tripleString(triple);
	std::string errorString;

	Tgt = TargetRegistry::lookupTarget(tripleString,
	errorString);

	if (!Tgt)
	return;

	MRI.reset(Tgt->createMCRegInfo(tripleString));

	if (!MRI)
	return;

	initMaps(*MRI);

	AsmInfo.reset(Tgt->createMCAsmInfo(tripleString));

	if (!AsmInfo)
	return;

	STI.reset(Tgt->createMCSubtargetInfo(tripleString, "", ""));

	if (!STI)
	return;

	Disassembler.reset(Tgt->createMCDisassembler(*STI));

	if (!Disassembler)
	return;

	InstInfos = Disassembler->getEDInfo();

	InstString.reset(new std::string);
	InstStream.reset(new raw_string_ostream(*InstString));
	InstPrinter.reset(Tgt->createMCInstPrinter(LLVMSyntaxVariant, AsmInfo, STI));

	if (!InstPrinter)
	return;

	GenericAsmLexer.reset(new AsmLexer(*AsmInfo));
	SpecificAsmLexer.reset(Tgt->createMCAsmLexer(MRI, AsmInfo));
	SpecificAsmLexer->InstallLexer(*GenericAsmLexer);

	initMaps(*MRI);

	Valid = true;
	}

	EDDisassembler::~EDDisassembler() {
	if (!valid())
	return;
	}

	namespace {
	/// EDMemoryObject - a subclass of MemoryObject that allows use of a callback
	/// as provided by the sd interface. See MemoryObject.
	class EDMemoryObject : public llvm::MemoryObject {
	private:
	EDByteReaderCallback Callback;
	void *Arg;
	public:
	EDMemoryObject(EDByteReaderCallback callback,
	void *arg) : Callback(callback), Arg(arg) { }
	~EDMemoryObject() { }
	uint64_t getBase() const { return 0x0; }
	uint64_t getExtent() const { return (uint64_t)-1; }
	int readByte(uint64_t address, uint8_t *ptr) const {
	if (!Callback)
	return -1;

	if (Callback(ptr, address, Arg))
	return -1;

	return 0;
	}
	};
	}

	EDInst *EDDisassembler::createInst(EDByteReaderCallback byteReader,
	uint64_t address,
	void *arg) {
	EDMemoryObject memoryObject(byteReader, arg);

	MCInst* inst = new MCInst;
	uint64_t byteSize;

	MCDisassembler::DecodeStatus S;
	S = Disassembler->getInstruction(*inst, byteSize, memoryObject, address,
	ErrorStream, nulls());
	switch (S) {
	case MCDisassembler::Fail:
	case MCDisassembler::SoftFail:
	// FIXME: Do something different on soft failure mode?
	delete inst;
	return NULL;

	case MCDisassembler::Success: {
	const llvm::EDInstInfo *thisInstInfo = NULL;

	if (InstInfos) {
	thisInstInfo = &InstInfos[inst->getOpcode()];
	}

	EDInst* sdInst = new EDInst(inst, byteSize, *this, thisInstInfo);
	return sdInst;
	}
	}
	return NULL;
	}

	void EDDisassembler::initMaps(const MCRegisterInfo &registerInfo) {
	unsigned numRegisters = registerInfo.getNumRegs();
	unsigned registerIndex;

	for (registerIndex = 0; registerIndex < numRegisters; ++registerIndex) {
	const char* registerName = registerInfo.get(registerIndex).Name;

	RegVec.push_back(registerName);
	RegRMap[registerName] = registerIndex;
	}

	switch (Key.Arch) {
	default:
	break;
	case Triple::x86:
	case Triple::x86_64:
	stackPointers.insert(registerIDWithName("SP"));
	stackPointers.insert(registerIDWithName("ESP"));
	stackPointers.insert(registerIDWithName("RSP"));

	programCounters.insert(registerIDWithName("IP"));
	programCounters.insert(registerIDWithName("EIP"));
	programCounters.insert(registerIDWithName("RIP"));
	break;
	case Triple::arm:
	case Triple::thumb:
	stackPointers.insert(registerIDWithName("SP"));

	programCounters.insert(registerIDWithName("PC"));
	break;
	}
	}

	const char *EDDisassembler::nameWithRegisterID(unsigned registerID) const {
	if (registerID >= RegVec.size())
	return NULL;
	else
	return RegVec[registerID].c_str();
	}

	unsigned EDDisassembler::registerIDWithName(const char *name) const {
	regrmap_t::const_iterator iter = RegRMap.find(std::string(name));
	if (iter == RegRMap.end())
	return 0;
	else
	return (*iter).second;
	}

	bool EDDisassembler::registerIsStackPointer(unsigned registerID) {
	return (stackPointers.find(registerID) != stackPointers.end());
	}

	bool EDDisassembler::registerIsProgramCounter(unsigned registerID) {
	return (programCounters.find(registerID) != programCounters.end());
	}

	int EDDisassembler::printInst(std::string &str, MCInst &inst) {
	PrinterMutex.acquire();

	InstPrinter->printInst(&inst, *InstStream, "");
	InstStream->flush();
	str = *InstString;
	InstString->clear();

	PrinterMutex.release();

	return 0;
	}

	static void diag_handler(const SMDiagnostic &diag,
	void *context)
	{
	if (context) {
	EDDisassembler disassembler = static_cast<EDDisassembler>(context);
	diag.Print("", disassembler->ErrorStream);
	}
	}

	int EDDisassembler::parseInst(SmallVectorImpl<MCParsedAsmOperand*> &operands,
	SmallVectorImpl<AsmToken> &tokens,
	const std::string &str) {
	int ret = 0;

	switch (Key.Arch) {
	default:
	return -1;
	case Triple::x86:
	case Triple::x86_64:
	case Triple::arm:
	case Triple::thumb:
	break;
	}

	const char *cStr = str.c_str();
	MemoryBuffer *buf = MemoryBuffer::getMemBuffer(cStr, cStr + strlen(cStr));

	StringRef instName;
	SMLoc instLoc;

	SourceMgr sourceMgr;
	sourceMgr.setDiagHandler(diag_handler, static_cast<void*>(this));
	sourceMgr.AddNewSourceBuffer(buf, SMLoc()); // ownership of buf handed over
	MCContext context(AsmInfo, MRI, NULL);
	OwningPtr<MCStreamer> streamer(createNullStreamer(context));
	OwningPtr<MCAsmParser> genericParser(createMCAsmParser(sourceMgr,
	context, *streamer,
	*AsmInfo));

	StringRef triple = tripleFromArch(Key.Arch);
	OwningPtr<MCSubtargetInfo> STI(Tgt->createMCSubtargetInfo(triple, "", ""));
	OwningPtr<MCTargetAsmParser>
	TargetParser(Tgt->createMCAsmParser(STI, genericParser));

	AsmToken OpcodeToken = genericParser->Lex();
	AsmToken NextToken = genericParser->Lex(); // consume next token, because specificParser expects us to

	if (OpcodeToken.is(AsmToken::Identifier)) {
	instName = OpcodeToken.getString();
	instLoc = OpcodeToken.getLoc();

	if (NextToken.isNot(AsmToken::Eof) &&
	TargetParser->ParseInstruction(instName, instLoc, operands))
	ret = -1;
	} else {
	ret = -1;
	}

	ParserMutex.acquire();

	if (!ret) {
	GenericAsmLexer->setBuffer(buf);

	while (SpecificAsmLexer->Lex(),
	SpecificAsmLexer->isNot(AsmToken::Eof) &&
	SpecificAsmLexer->isNot(AsmToken::EndOfStatement)) {
	if (SpecificAsmLexer->is(AsmToken::Error)) {
	ret = -1;
	break;
	}
	tokens.push_back(SpecificAsmLexer->getTok());
	}
	}

	ParserMutex.release();

	return ret;
	}

	int EDDisassembler::llvmSyntaxVariant() const {
	return LLVMSyntaxVariant;
	}