1 //===-EDDisassembler.cpp - LLVM Enhanced Disassembler ---------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Enhanced Disassembly library's disassembler class.
11 // The disassembler is responsible for vending individual instructions according
12 // to a given architecture and disassembly syntax.
14 //===----------------------------------------------------------------------===//
16 #include "llvm/ADT/OwningPtr.h"
17 #include "llvm/ADT/SmallVector.h"
18 #include "llvm/MC/MCAsmInfo.h"
19 #include "llvm/MC/MCContext.h"
20 #include "llvm/MC/MCDisassembler.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/MC/MCInst.h"
23 #include "llvm/MC/MCInstPrinter.h"
24 #include "llvm/MC/MCStreamer.h"
25 #include "llvm/MC/MCParser/AsmLexer.h"
26 #include "llvm/MC/MCParser/AsmParser.h"
27 #include "llvm/MC/MCParser/MCAsmParser.h"
28 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
29 #include "llvm/Support/MemoryBuffer.h"
30 #include "llvm/Support/MemoryObject.h"
31 #include "llvm/Support/SourceMgr.h"
32 #include "llvm/Target/TargetAsmLexer.h"
33 #include "llvm/Target/TargetAsmParser.h"
34 #include "llvm/Target/TargetRegistry.h"
35 #include "llvm/Target/TargetMachine.h"
36 #include "llvm/Target/TargetRegisterInfo.h"
37 #include "llvm/Target/TargetSelect.h"
39 #include "EDDisassembler.h"
42 #include "../../lib/Target/X86/X86GenEDInfo.inc"
46 bool EDDisassembler::sInitialized = false;
47 EDDisassembler::DisassemblerMap_t EDDisassembler::sDisassemblers;
50 Triple::ArchType Arch;
55 static struct InfoMap infomap[] = {
56 { Triple::x86, "i386-unknown-unknown", instInfoX86 },
57 { Triple::x86_64, "x86_64-unknown-unknown", instInfoX86 },
58 { Triple::InvalidArch, NULL, NULL }
61 /// infoFromArch - Returns the InfoMap corresponding to a given architecture,
62 /// or NULL if there is an error
64 /// @arg arch - The Triple::ArchType for the desired architecture
65 static const InfoMap *infoFromArch(Triple::ArchType arch) {
66 unsigned int infoIndex;
68 for (infoIndex = 0; infomap[infoIndex].String != NULL; ++infoIndex) {
69 if(arch == infomap[infoIndex].Arch)
70 return &infomap[infoIndex];
76 /// getLLVMSyntaxVariant - gets the constant to use to get an assembly printer
77 /// for the desired assembly syntax, suitable for passing to
78 /// Target::createMCInstPrinter()
80 /// @arg arch - The target architecture
81 /// @arg syntax - The assembly syntax in sd form
82 static int getLLVMSyntaxVariant(Triple::ArchType arch,
83 EDAssemblySyntax_t syntax) {
87 // Mappings below from X86AsmPrinter.cpp
88 case kEDAssemblySyntaxX86ATT:
89 if (arch == Triple::x86 || arch == Triple::x86_64)
93 case kEDAssemblySyntaxX86Intel:
94 if (arch == Triple::x86 || arch == Triple::x86_64)
101 #define BRINGUP_TARGET(tgt) \
102 LLVMInitialize##tgt##TargetInfo(); \
103 LLVMInitialize##tgt##Target(); \
104 LLVMInitialize##tgt##AsmPrinter(); \
105 LLVMInitialize##tgt##AsmParser(); \
106 LLVMInitialize##tgt##Disassembler();
108 void EDDisassembler::initialize() {
117 #undef BRINGUP_TARGET
119 EDDisassembler *EDDisassembler::getDisassembler(Triple::ArchType arch,
120 EDAssemblySyntax_t syntax) {
125 EDDisassembler::DisassemblerMap_t::iterator i = sDisassemblers.find(key);
127 if (i != sDisassemblers.end()) {
131 EDDisassembler* sdd = new EDDisassembler(key);
137 sDisassemblers[key] = sdd;
145 EDDisassembler *EDDisassembler::getDisassembler(StringRef str,
146 EDAssemblySyntax_t syntax) {
149 return getDisassembler(triple.getArch(), syntax);
152 EDDisassembler::EDDisassembler(CPUKey &key) :
153 Valid(false), ErrorString(), ErrorStream(ErrorString), Key(key) {
154 const InfoMap *infoMap = infoFromArch(key.Arch);
159 const char *triple = infoMap->String;
161 int syntaxVariant = getLLVMSyntaxVariant(key.Arch, key.Syntax);
163 if (syntaxVariant < 0)
166 std::string tripleString(triple);
167 std::string errorString;
169 Tgt = TargetRegistry::lookupTarget(tripleString,
175 std::string featureString;
177 OwningPtr<const TargetMachine>
178 targetMachine(Tgt->createTargetMachine(tripleString,
181 const TargetRegisterInfo *registerInfo = targetMachine->getRegisterInfo();
186 AsmInfo.reset(Tgt->createAsmInfo(tripleString));
191 Disassembler.reset(Tgt->createMCDisassembler());
196 InstString.reset(new std::string);
197 InstStream.reset(new raw_string_ostream(*InstString));
198 InstPrinter.reset(Tgt->createMCInstPrinter(syntaxVariant, *AsmInfo));
203 GenericAsmLexer.reset(new AsmLexer(*AsmInfo));
204 SpecificAsmLexer.reset(Tgt->createAsmLexer(*AsmInfo));
205 SpecificAsmLexer->InstallLexer(*GenericAsmLexer);
207 InstInfos = infoMap->Info;
209 initMaps(*targetMachine->getRegisterInfo());
214 EDDisassembler::~EDDisassembler() {
220 /// EDMemoryObject - a subclass of MemoryObject that allows use of a callback
221 /// as provided by the sd interface. See MemoryObject.
222 class EDMemoryObject : public llvm::MemoryObject {
224 EDByteReaderCallback Callback;
227 EDMemoryObject(EDByteReaderCallback callback,
228 void *arg) : Callback(callback), Arg(arg) { }
229 ~EDMemoryObject() { }
230 uint64_t getBase() const { return 0x0; }
231 uint64_t getExtent() const { return (uint64_t)-1; }
232 int readByte(uint64_t address, uint8_t *ptr) const {
236 if(Callback(ptr, address, Arg))
244 EDInst *EDDisassembler::createInst(EDByteReaderCallback byteReader,
247 EDMemoryObject memoryObject(byteReader, arg);
249 MCInst* inst = new MCInst;
252 if (!Disassembler->getInstruction(*inst,
261 const InstInfo *thisInstInfo = &InstInfos[inst->getOpcode()];
263 EDInst* sdInst = new EDInst(inst, byteSize, *this, thisInstInfo);
268 void EDDisassembler::initMaps(const TargetRegisterInfo ®isterInfo) {
269 unsigned numRegisters = registerInfo.getNumRegs();
270 unsigned registerIndex;
272 for (registerIndex = 0; registerIndex < numRegisters; ++registerIndex) {
273 const char* registerName = registerInfo.get(registerIndex).Name;
275 RegVec.push_back(registerName);
276 RegRMap[registerName] = registerIndex;
279 if (Key.Arch == Triple::x86 ||
280 Key.Arch == Triple::x86_64) {
281 stackPointers.insert(registerIDWithName("SP"));
282 stackPointers.insert(registerIDWithName("ESP"));
283 stackPointers.insert(registerIDWithName("RSP"));
285 programCounters.insert(registerIDWithName("IP"));
286 programCounters.insert(registerIDWithName("EIP"));
287 programCounters.insert(registerIDWithName("RIP"));
291 const char *EDDisassembler::nameWithRegisterID(unsigned registerID) const {
292 if (registerID >= RegVec.size())
295 return RegVec[registerID].c_str();
298 unsigned EDDisassembler::registerIDWithName(const char *name) const {
299 regrmap_t::const_iterator iter = RegRMap.find(std::string(name));
300 if (iter == RegRMap.end())
303 return (*iter).second;
306 bool EDDisassembler::registerIsStackPointer(unsigned registerID) {
307 return (stackPointers.find(registerID) != stackPointers.end());
310 bool EDDisassembler::registerIsProgramCounter(unsigned registerID) {
311 return (programCounters.find(registerID) != programCounters.end());
314 int EDDisassembler::printInst(std::string &str, MCInst &inst) {
315 PrinterMutex.acquire();
317 InstPrinter->printInst(&inst, *InstStream);
322 PrinterMutex.release();
327 int EDDisassembler::parseInst(SmallVectorImpl<MCParsedAsmOperand*> &operands,
328 SmallVectorImpl<AsmToken> &tokens,
329 const std::string &str) {
332 const char *cStr = str.c_str();
333 MemoryBuffer *buf = MemoryBuffer::getMemBuffer(cStr, cStr + strlen(cStr));
339 sourceMgr.AddNewSourceBuffer(buf, SMLoc()); // ownership of buf handed over
340 MCContext context(*AsmInfo);
341 OwningPtr<MCStreamer> streamer(createNullStreamer(context));
342 AsmParser genericParser(sourceMgr, context, *streamer, *AsmInfo);
343 OwningPtr<TargetAsmParser> TargetParser(Tgt->createAsmParser(genericParser));
345 AsmToken OpcodeToken = genericParser.Lex();
347 if(OpcodeToken.is(AsmToken::Identifier)) {
348 instName = OpcodeToken.getString();
349 instLoc = OpcodeToken.getLoc();
350 if (TargetParser->ParseInstruction(instName, instLoc, operands))
357 ParserMutex.acquire();
360 GenericAsmLexer->setBuffer(buf);
362 while (SpecificAsmLexer->Lex(),
363 SpecificAsmLexer->isNot(AsmToken::Eof) &&
364 SpecificAsmLexer->isNot(AsmToken::EndOfStatement)) {
365 if (SpecificAsmLexer->is(AsmToken::Error)) {
369 tokens.push_back(SpecificAsmLexer->getTok());
373 ParserMutex.release();
378 int EDDisassembler::llvmSyntaxVariant() const {
379 return LLVMSyntaxVariant;