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llvm-mirror/tools/llvm-mc/Disassembler.cpp
Benjamin Kramer a52be4ff03 Clients are responsible for initializing the targets, remove it from the disassembler API. 
This will break users of the LLVMCreateDisasm API (not that I know of any). They have to call the 
LLVMInitializeAll* functions from llvm-c/Target.h themselves now. edis' C API in all its horribleness 
should be unaffected.

llvm-svn: 144385
2011-11-11 13:20:40 +00:00

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//===- Disassembler.cpp - Disassembler for hex strings --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class implements the disassembler of strings of bytes written in
// hexadecimal, from standard input or from a file.
//
//===----------------------------------------------------------------------===//
#include "Disassembler.h"
#include "../../lib/MC/MCDisassembler/EDDisassembler.h"
#include "../../lib/MC/MCDisassembler/EDInst.h"
#include "../../lib/MC/MCDisassembler/EDOperand.h"
#include "../../lib/MC/MCDisassembler/EDToken.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
typedef std::vector<std::pair<unsigned char, const char*> > ByteArrayTy;
namespace {
class VectorMemoryObject : public MemoryObject {
private:
const ByteArrayTy &Bytes;
public:
VectorMemoryObject(const ByteArrayTy &bytes) : Bytes(bytes) {}
uint64_t getBase() const { return 0; }
uint64_t getExtent() const { return Bytes.size(); }
int readByte(uint64_t Addr, uint8_t *Byte) const {
if (Addr >= getExtent())
return -1;
*Byte = Bytes[Addr].first;
return 0;
}
};
}
static bool PrintInsts(const MCDisassembler &DisAsm,
MCInstPrinter &Printer, const ByteArrayTy &Bytes,
SourceMgr &SM, raw_ostream &Out) {
// Wrap the vector in a MemoryObject.
VectorMemoryObject memoryObject(Bytes);
// Disassemble it to strings.
uint64_t Size;
uint64_t Index;
for (Index = 0; Index < Bytes.size(); Index += Size) {
MCInst Inst;
MCDisassembler::DecodeStatus S;
S = DisAsm.getInstruction(Inst, Size, memoryObject, Index,
/*REMOVE*/ nulls(), nulls());
switch (S) {
case MCDisassembler::Fail:
SM.PrintMessage(SMLoc::getFromPointer(Bytes[Index].second),
SourceMgr::DK_Warning,
"invalid instruction encoding");
if (Size == 0)
Size = 1; // skip illegible bytes
break;
case MCDisassembler::SoftFail:
SM.PrintMessage(SMLoc::getFromPointer(Bytes[Index].second),
SourceMgr::DK_Warning,
"potentially undefined instruction encoding");
// Fall through
case MCDisassembler::Success:
Printer.printInst(&Inst, Out, "");
Out << "\n";
break;
}
}
return false;
}
static bool ByteArrayFromString(ByteArrayTy &ByteArray,
StringRef &Str,
SourceMgr &SM) {
while (!Str.empty()) {
// Strip horizontal whitespace.
if (size_t Pos = Str.find_first_not_of(" \t\r")) {
Str = Str.substr(Pos);
continue;
}
// If this is the end of a line or start of a comment, remove the rest of
// the line.
if (Str[0] == '\n' || Str[0] == '#') {
// Strip to the end of line if we already processed any bytes on this
// line. This strips the comment and/or the \n.
if (Str[0] == '\n') {
Str = Str.substr(1);
} else {
Str = Str.substr(Str.find_first_of('\n'));
if (!Str.empty())
Str = Str.substr(1);
}
continue;
}
// Get the current token.
size_t Next = Str.find_first_of(" \t\n\r#");
StringRef Value = Str.substr(0, Next);
// Convert to a byte and add to the byte vector.
unsigned ByteVal;
if (Value.getAsInteger(0, ByteVal) || ByteVal > 255) {
// If we have an error, print it and skip to the end of line.
SM.PrintMessage(SMLoc::getFromPointer(Value.data()), SourceMgr::DK_Error,
"invalid input token");
Str = Str.substr(Str.find('\n'));
ByteArray.clear();
continue;
}
ByteArray.push_back(std::make_pair((unsigned char)ByteVal, Value.data()));
Str = Str.substr(Next);
}
return false;
}
int Disassembler::disassemble(const Target &T,
const std::string &Triple,
const std::string &Cpu,
const std::string &FeaturesStr,
MemoryBuffer &Buffer,
raw_ostream &Out) {
// Set up disassembler.
OwningPtr<const MCAsmInfo> AsmInfo(T.createMCAsmInfo(Triple));
if (!AsmInfo) {
errs() << "error: no assembly info for target " << Triple << "\n";
return -1;
}
OwningPtr<const MCSubtargetInfo> STI(T.createMCSubtargetInfo(Triple, Cpu, FeaturesStr));
if (!STI) {
errs() << "error: no subtarget info for target " << Triple << "\n";
return -1;
}
OwningPtr<const MCDisassembler> DisAsm(T.createMCDisassembler(*STI));
if (!DisAsm) {
errs() << "error: no disassembler for target " << Triple << "\n";
return -1;
}
int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
OwningPtr<MCInstPrinter> IP(T.createMCInstPrinter(AsmPrinterVariant,
*AsmInfo, *STI));
if (!IP) {
errs() << "error: no instruction printer for target " << Triple << '\n';
return -1;
}
bool ErrorOccurred = false;
SourceMgr SM;
SM.AddNewSourceBuffer(&Buffer, SMLoc());
// Convert the input to a vector for disassembly.
ByteArrayTy ByteArray;
StringRef Str = Buffer.getBuffer();
ErrorOccurred |= ByteArrayFromString(ByteArray, Str, SM);
if (!ByteArray.empty())
ErrorOccurred |= PrintInsts(*DisAsm, *IP, ByteArray, SM, Out);
return ErrorOccurred;
}
static int byteArrayReader(uint8_t *B, uint64_t A, void *Arg) {
ByteArrayTy &ByteArray = *((ByteArrayTy*)Arg);
if (A >= ByteArray.size())
return -1;
*B = ByteArray[A].first;
return 0;
}
static int verboseEvaluator(uint64_t *V, unsigned R, void *Arg) {
EDDisassembler &disassembler = *(EDDisassembler *)((void **)Arg)[0];
raw_ostream &Out = *(raw_ostream *)((void **)Arg)[1];
if (const char *regName = disassembler.nameWithRegisterID(R))
Out << "[" << regName << "/" << R << "]";
if (disassembler.registerIsStackPointer(R))
Out << "(sp)";
if (disassembler.registerIsProgramCounter(R))
Out << "(pc)";
*V = 0;
return 0;
}
int Disassembler::disassembleEnhanced(const std::string &TS,
MemoryBuffer &Buffer,
raw_ostream &Out) {
ByteArrayTy ByteArray;
StringRef Str = Buffer.getBuffer();
SourceMgr SM;
SM.AddNewSourceBuffer(&Buffer, SMLoc());
if (ByteArrayFromString(ByteArray, Str, SM)) {
return -1;
}
Triple T(TS);
EDDisassembler::AssemblySyntax AS;
switch (T.getArch()) {
default:
errs() << "error: no default assembly syntax for " << TS.c_str() << "\n";
return -1;
case Triple::arm:
case Triple::thumb:
AS = EDDisassembler::kEDAssemblySyntaxARMUAL;
break;
case Triple::x86:
case Triple::x86_64:
AS = EDDisassembler::kEDAssemblySyntaxX86ATT;
break;
}
OwningPtr<EDDisassembler>
disassembler(EDDisassembler::getDisassembler(TS.c_str(), AS));
if (disassembler == 0) {
errs() << "error: couldn't get disassembler for " << TS << '\n';
return -1;
}
while (ByteArray.size()) {
OwningPtr<EDInst>
inst(disassembler->createInst(byteArrayReader, 0, &ByteArray));
if (inst == 0) {
errs() << "error: Didn't get an instruction\n";
return -1;
}
ByteArray.erase (ByteArray.begin(), ByteArray.begin() + inst->byteSize());
unsigned numTokens = inst->numTokens();
if ((int)numTokens < 0) {
errs() << "error: couldn't count the instruction's tokens\n";
return -1;
}
for (unsigned tokenIndex = 0; tokenIndex != numTokens; ++tokenIndex) {
EDToken *token;
if (inst->getToken(token, tokenIndex)) {
errs() << "error: Couldn't get token\n";
return -1;
}
const char *buf;
if (token->getString(buf)) {
errs() << "error: Couldn't get string for token\n";
return -1;
}
Out << '[';
int operandIndex = token->operandID();
if (operandIndex >= 0)
Out << operandIndex << "-";
switch (token->type()) {
default: Out << "?"; break;
case EDToken::kTokenWhitespace: Out << "w"; break;
case EDToken::kTokenPunctuation: Out << "p"; break;
case EDToken::kTokenOpcode: Out << "o"; break;
case EDToken::kTokenLiteral: Out << "l"; break;
case EDToken::kTokenRegister: Out << "r"; break;
}
Out << ":" << buf;
if (token->type() == EDToken::kTokenLiteral) {
Out << "=";
if (token->literalSign())
Out << "-";
uint64_t absoluteValue;
if (token->literalAbsoluteValue(absoluteValue)) {
errs() << "error: Couldn't get the value of a literal token\n";
return -1;
}
Out << absoluteValue;
} else if (token->type() == EDToken::kTokenRegister) {
Out << "=";
unsigned regID;
if (token->registerID(regID)) {
errs() << "error: Couldn't get the ID of a register token\n";
return -1;
}
Out << "r" << regID;
}
Out << "]";
}
Out << " ";
if (inst->isBranch())
Out << "<br> ";
if (inst->isMove())
Out << "<mov> ";
unsigned numOperands = inst->numOperands();
if ((int)numOperands < 0) {
errs() << "error: Couldn't count operands\n";
return -1;
}
for (unsigned operandIndex = 0; operandIndex != numOperands;
++operandIndex) {
Out << operandIndex << ":";
EDOperand *operand;
if (inst->getOperand(operand, operandIndex)) {
errs() << "error: couldn't get operand\n";
return -1;
}
uint64_t evaluatedResult;
void *Arg[] = { disassembler.get(), &Out };
if (operand->evaluate(evaluatedResult, verboseEvaluator, Arg)) {
errs() << "error: Couldn't evaluate an operand\n";
return -1;
}
Out << "=" << evaluatedResult << " ";
}
Out << '\n';
}
return 0;
}
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