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 "EDDisassembler.h"
18 #include "llvm/MC/EDInstInfo.h"
19 #include "llvm/MC/MCAsmInfo.h"
20 #include "llvm/MC/MCContext.h"
21 #include "llvm/MC/MCDisassembler.h"
22 #include "llvm/MC/MCExpr.h"
23 #include "llvm/MC/MCInst.h"
24 #include "llvm/MC/MCInstPrinter.h"
25 #include "llvm/MC/MCRegisterInfo.h"
26 #include "llvm/MC/MCStreamer.h"
27 #include "llvm/MC/MCSubtargetInfo.h"
28 #include "llvm/MC/MCParser/AsmLexer.h"
29 #include "llvm/MC/MCParser/MCAsmParser.h"
30 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
31 #include "llvm/MC/MCTargetAsmLexer.h"
32 #include "llvm/MC/MCTargetAsmParser.h"
33 #include "llvm/Support/MemoryBuffer.h"
34 #include "llvm/Support/MemoryObject.h"
35 #include "llvm/Support/SourceMgr.h"
36 #include "llvm/Support/TargetRegistry.h"
39 EDDisassembler::DisassemblerMap_t EDDisassembler::sDisassemblers;
42 Triple::ArchType Arch;
46 static struct TripleMap triplemap[] = {
47 { Triple::x86, "i386-unknown-unknown" },
48 { Triple::x86_64, "x86_64-unknown-unknown" },
49 { Triple::arm, "arm-unknown-unknown" },
50 { Triple::thumb, "thumb-unknown-unknown" }
53 /// infoFromArch - Returns the TripleMap corresponding to a given architecture,
54 /// or NULL if there is an error
56 /// @arg arch - The Triple::ArchType for the desired architecture
57 static const char *tripleFromArch(Triple::ArchType arch) {
58 unsigned int infoIndex;
60 for (infoIndex = 0; triplemap[infoIndex].String != NULL; ++infoIndex) {
61 if (arch == triplemap[infoIndex].Arch)
62 return triplemap[infoIndex].String;
68 /// getLLVMSyntaxVariant - gets the constant to use to get an assembly printer
69 /// for the desired assembly syntax, suitable for passing to
70 /// Target::createMCInstPrinter()
72 /// @arg arch - The target architecture
73 /// @arg syntax - The assembly syntax in sd form
74 static int getLLVMSyntaxVariant(Triple::ArchType arch,
75 EDDisassembler::AssemblySyntax syntax) {
77 // Mappings below from X86AsmPrinter.cpp
78 case EDDisassembler::kEDAssemblySyntaxX86ATT:
79 if (arch == Triple::x86 || arch == Triple::x86_64)
82 case EDDisassembler::kEDAssemblySyntaxX86Intel:
83 if (arch == Triple::x86 || arch == Triple::x86_64)
86 case EDDisassembler::kEDAssemblySyntaxARMUAL:
87 if (arch == Triple::arm || arch == Triple::thumb)
95 EDDisassembler *EDDisassembler::getDisassembler(Triple::ArchType arch,
96 AssemblySyntax syntax) {
97 const char *triple = tripleFromArch(arch);
98 return getDisassembler(StringRef(triple), syntax);
101 EDDisassembler *EDDisassembler::getDisassembler(StringRef str,
102 AssemblySyntax syntax) {
104 key.Triple = str.str();
107 EDDisassembler::DisassemblerMap_t::iterator i = sDisassemblers.find(key);
109 if (i != sDisassemblers.end()) {
113 EDDisassembler *sdd = new EDDisassembler(key);
119 sDisassemblers[key] = sdd;
124 EDDisassembler::EDDisassembler(CPUKey &key) :
127 ErrorStream(nulls()),
129 TgtTriple(key.Triple.c_str()) {
131 LLVMSyntaxVariant = getLLVMSyntaxVariant(TgtTriple.getArch(), key.Syntax);
133 if (LLVMSyntaxVariant < 0)
136 std::string tripleString(key.Triple);
137 std::string errorString;
139 Tgt = TargetRegistry::lookupTarget(key.Triple,
145 MRI.reset(Tgt->createMCRegInfo(tripleString));
152 AsmInfo.reset(Tgt->createMCAsmInfo(tripleString));
157 STI.reset(Tgt->createMCSubtargetInfo(tripleString, "", ""));
162 Disassembler.reset(Tgt->createMCDisassembler(*STI));
167 InstInfos = Disassembler->getEDInfo();
169 InstString.reset(new std::string);
170 InstStream.reset(new raw_string_ostream(*InstString));
171 InstPrinter.reset(Tgt->createMCInstPrinter(LLVMSyntaxVariant, *AsmInfo,
177 GenericAsmLexer.reset(new AsmLexer(*AsmInfo));
178 SpecificAsmLexer.reset(Tgt->createMCAsmLexer(*MRI, *AsmInfo));
179 SpecificAsmLexer->InstallLexer(*GenericAsmLexer);
186 EDDisassembler::~EDDisassembler() {
192 /// EDMemoryObject - a subclass of MemoryObject that allows use of a callback
193 /// as provided by the sd interface. See MemoryObject.
194 class EDMemoryObject : public llvm::MemoryObject {
196 EDByteReaderCallback Callback;
199 EDMemoryObject(EDByteReaderCallback callback,
200 void *arg) : Callback(callback), Arg(arg) { }
201 ~EDMemoryObject() { }
202 uint64_t getBase() const { return 0x0; }
203 uint64_t getExtent() const { return (uint64_t)-1; }
204 int readByte(uint64_t address, uint8_t *ptr) const {
208 if (Callback(ptr, address, Arg))
216 EDInst *EDDisassembler::createInst(EDByteReaderCallback byteReader,
219 EDMemoryObject memoryObject(byteReader, arg);
221 MCInst* inst = new MCInst;
224 MCDisassembler::DecodeStatus S;
225 S = Disassembler->getInstruction(*inst, byteSize, memoryObject, address,
226 ErrorStream, nulls());
228 case MCDisassembler::Fail:
229 case MCDisassembler::SoftFail:
230 // FIXME: Do something different on soft failure mode?
234 case MCDisassembler::Success: {
235 const llvm::EDInstInfo *thisInstInfo = NULL;
238 thisInstInfo = &InstInfos[inst->getOpcode()];
241 EDInst* sdInst = new EDInst(inst, byteSize, *this, thisInstInfo);
248 void EDDisassembler::initMaps(const MCRegisterInfo ®isterInfo) {
249 unsigned numRegisters = registerInfo.getNumRegs();
250 unsigned registerIndex;
252 for (registerIndex = 0; registerIndex < numRegisters; ++registerIndex) {
253 const char* registerName = registerInfo.get(registerIndex).Name;
255 RegVec.push_back(registerName);
256 RegRMap[registerName] = registerIndex;
259 switch (TgtTriple.getArch()) {
264 stackPointers.insert(registerIDWithName("SP"));
265 stackPointers.insert(registerIDWithName("ESP"));
266 stackPointers.insert(registerIDWithName("RSP"));
268 programCounters.insert(registerIDWithName("IP"));
269 programCounters.insert(registerIDWithName("EIP"));
270 programCounters.insert(registerIDWithName("RIP"));
274 stackPointers.insert(registerIDWithName("SP"));
276 programCounters.insert(registerIDWithName("PC"));
281 const char *EDDisassembler::nameWithRegisterID(unsigned registerID) const {
282 if (registerID >= RegVec.size())
285 return RegVec[registerID].c_str();
288 unsigned EDDisassembler::registerIDWithName(const char *name) const {
289 regrmap_t::const_iterator iter = RegRMap.find(std::string(name));
290 if (iter == RegRMap.end())
293 return (*iter).second;
296 bool EDDisassembler::registerIsStackPointer(unsigned registerID) {
297 return (stackPointers.find(registerID) != stackPointers.end());
300 bool EDDisassembler::registerIsProgramCounter(unsigned registerID) {
301 return (programCounters.find(registerID) != programCounters.end());
304 int EDDisassembler::printInst(std::string &str, MCInst &inst) {
305 PrinterMutex.acquire();
307 InstPrinter->printInst(&inst, *InstStream, "");
312 PrinterMutex.release();
317 static void diag_handler(const SMDiagnostic &diag, void *context) {
319 diag.print("", static_cast<EDDisassembler*>(context)->ErrorStream);
322 int EDDisassembler::parseInst(SmallVectorImpl<MCParsedAsmOperand*> &operands,
323 SmallVectorImpl<AsmToken> &tokens,
324 const std::string &str) {
327 switch (TgtTriple.getArch()) {
337 const char *cStr = str.c_str();
338 MemoryBuffer *buf = MemoryBuffer::getMemBuffer(cStr, cStr + strlen(cStr));
344 sourceMgr.setDiagHandler(diag_handler, static_cast<void*>(this));
345 sourceMgr.AddNewSourceBuffer(buf, SMLoc()); // ownership of buf handed over
346 MCContext context(*AsmInfo, *MRI, NULL);
347 OwningPtr<MCStreamer> streamer(createNullStreamer(context));
348 OwningPtr<MCAsmParser> genericParser(createMCAsmParser(sourceMgr,
352 OwningPtr<MCSubtargetInfo> STI(Tgt->createMCSubtargetInfo(Key.Triple.c_str(), "", ""));
353 OwningPtr<MCTargetAsmParser>
354 TargetParser(Tgt->createMCAsmParser(*STI, *genericParser));
356 AsmToken OpcodeToken = genericParser->Lex();
357 AsmToken NextToken = genericParser->Lex(); // consume next token, because specificParser expects us to
359 if (OpcodeToken.is(AsmToken::Identifier)) {
360 instName = OpcodeToken.getString();
361 instLoc = OpcodeToken.getLoc();
363 if (NextToken.isNot(AsmToken::Eof) &&
364 TargetParser->ParseInstruction(instName, instLoc, operands))
370 ParserMutex.acquire();
373 GenericAsmLexer->setBuffer(buf);
375 while (SpecificAsmLexer->Lex(),
376 SpecificAsmLexer->isNot(AsmToken::Eof) &&
377 SpecificAsmLexer->isNot(AsmToken::EndOfStatement)) {
378 if (SpecificAsmLexer->is(AsmToken::Error)) {
382 tokens.push_back(SpecificAsmLexer->getTok());
386 ParserMutex.release();
391 int EDDisassembler::llvmSyntaxVariant() const {
392 return LLVMSyntaxVariant;