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//===- HexDisassembler.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 "HexDisassembler.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/raw_ostream.h"
#include <vector>
using namespace llvm;
class VectorMemoryObject : public MemoryObject {
private:
const std::vector<unsigned char> &Bytes;
public:
VectorMemoryObject(const std::vector<unsigned char> &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;
else
*byte = Bytes[addr];
return 0;
}
};
void printInst(const llvm::MCDisassembler &disassembler,
llvm::MCInstPrinter &instPrinter,
const std::vector<unsigned char> &bytes) {
// Wrap the vector in a MemoryObject.
VectorMemoryObject memoryObject(bytes);
// Disassemble it.
MCInst inst;
uint64_t size;
std::string verboseOStr;
llvm::raw_string_ostream verboseOS(verboseOStr);
if (disassembler.getInstruction(inst,
size,
memoryObject,
0,
verboseOS)) {
instPrinter.printInst(&inst);
outs() << "\n";
}
else {
errs() << "error: invalid instruction" << "\n";
errs() << "Diagnostic log:" << "\n";
errs() << verboseOStr.c_str() << "\n";
}
}
int HexDisassembler::disassemble(const Target &target,
const std::string &tripleString,
MemoryBuffer &buffer) {
// Set up disassembler
llvm::OwningPtr<const llvm::MCAsmInfo> asmInfo
(target.createAsmInfo(tripleString));
if (!asmInfo) {
errs() << "error: no assembly info for target " << tripleString << "\n";
return -1;
}
llvm::OwningPtr<const llvm::MCDisassembler> disassembler
(target.createMCDisassembler());
if (!disassembler) {
errs() << "error: no disassembler for target " << tripleString << "\n";
return -1;
}
llvm::MCInstPrinter *instPrinter = target.createMCInstPrinter(0,
*asmInfo,
outs());
if (!instPrinter) {
errs() << "error: no instruction printer for target " << tripleString
<< "\n";
return -1;
}
// Convert the input to a vector for disassembly.
std::vector<unsigned char> bytes;
StringRef str = buffer.getBuffer();
while (!str.empty()) {
if(str.find_first_of("\n") < str.find_first_not_of(" \t\n\r")) {
printInst(*disassembler, *instPrinter, bytes);
bytes.clear();
}
// Skip leading space.
str = str.substr(str.find_first_not_of(" \t\n\r"));
// Get the current token.
size_t next = str.find_first_of(" \t\n\r");
if(next == (size_t)StringRef::npos)
break;
StringRef value = str.slice(0, next);
// Convert to a byte and add to the byte vector.
unsigned byte;
if (value.getAsInteger(0, byte) || byte > 255) {
errs() << "warning: invalid input token '" << value << "' of length "
<< next << "\n";
}
else {
bytes.push_back((unsigned char)byte);
}
str = str.substr(next);
}
if (!bytes.empty())
printInst(*disassembler, *instPrinter, bytes);
return 0;
}
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