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-//===-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/ADT/OwningPtr.h"
-#include "llvm/ADT/SmallVector.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/MCStreamer.h"
-#include "llvm/MC/MCParser/AsmLexer.h"
-#include "llvm/MC/MCParser/MCAsmParser.h"
-#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/MemoryObject.h"
-#include "llvm/Support/SourceMgr.h"
-#include "llvm/Target/TargetAsmLexer.h"
-#include "llvm/Target/TargetAsmParser.h"
-#include "llvm/Target/TargetRegistry.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Target/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,
- EDAssemblySyntax_t syntax) {
- switch (syntax) {
- default:
- return -1;
- // Mappings below from X86AsmPrinter.cpp
- case kEDAssemblySyntaxX86ATT:
- if (arch == Triple::x86 || arch == Triple::x86_64)
- return 0;
- else
- return -1;
- case kEDAssemblySyntaxX86Intel:
- if (arch == Triple::x86 || arch == Triple::x86_64)
- return 1;
- else
- return -1;
- case kEDAssemblySyntaxARMUAL:
- if (arch == Triple::arm || arch == Triple::thumb)
- return 0;
- else
- return -1;
- }
-}
-
-void EDDisassembler::initialize() {
- if (sInitialized)
- return;
-
- sInitialized = true;
-
- InitializeAllTargetInfos();
- InitializeAllTargets();
- InitializeAllAsmPrinters();
- InitializeAllAsmParsers();
- InitializeAllDisassemblers();
-}
-
-#undef BRINGUP_TARGET
-
-EDDisassembler *EDDisassembler::getDisassembler(Triple::ArchType arch,
- EDAssemblySyntax_t 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,
- EDAssemblySyntax_t syntax) {
- Triple triple(str);
-
- return getDisassembler(triple.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;
-
- std::string featureString;
-
- TargetMachine.reset(Tgt->createTargetMachine(tripleString,
- featureString));
-
- const TargetRegisterInfo *registerInfo = TargetMachine->getRegisterInfo();
-
- if (!registerInfo)
- return;
-
- initMaps(*registerInfo);
-
- AsmInfo.reset(Tgt->createAsmInfo(tripleString));
-
- if (!AsmInfo)
- return;
-
- Disassembler.reset(Tgt->createMCDisassembler());
-
- if (!Disassembler)
- return;
-
- InstInfos = Disassembler->getEDInfo();
-
- InstString.reset(new std::string);
- InstStream.reset(new raw_string_ostream(*InstString));
- InstPrinter.reset(Tgt->createMCInstPrinter(LLVMSyntaxVariant, *AsmInfo));
-
- if (!InstPrinter)
- return;
-
- GenericAsmLexer.reset(new AsmLexer(*AsmInfo));
- SpecificAsmLexer.reset(Tgt->createAsmLexer(*AsmInfo));
- SpecificAsmLexer->InstallLexer(*GenericAsmLexer);
-
- initMaps(*TargetMachine->getRegisterInfo());
-
- 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;
-
- if (!Disassembler->getInstruction(*inst,
- byteSize,
- memoryObject,
- address,
- ErrorStream)) {
- delete inst;
- return NULL;
- } else {
- const llvm::EDInstInfo *thisInstInfo;
-
- thisInstInfo = &InstInfos[inst->getOpcode()];
-
- EDInst* sdInst = new EDInst(inst, byteSize, *this, thisInstInfo);
- return sdInst;
- }
-}
-
-void EDDisassembler::initMaps(const TargetRegisterInfo &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;
-}
-
-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.AddNewSourceBuffer(buf, SMLoc()); // ownership of buf handed over
- MCContext context(*AsmInfo);
- OwningPtr<MCStreamer> streamer(createNullStreamer(context));
- OwningPtr<MCAsmParser> genericParser(createMCAsmParser(*Tgt, sourceMgr,
- context, *streamer,
- *AsmInfo));
- OwningPtr<TargetAsmParser> TargetParser(Tgt->createAsmParser(*genericParser,
- *TargetMachine));
-
- 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;
-}
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