1//===- lib/Support/Disassembler.cpp -----------------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the necessary glue to call external disassembler 11// libraries. 12// 13//===----------------------------------------------------------------------===// 14 15#include "llvm/Support/Disassembler.h" 16#include "llvm/Config/config.h" 17#include <cassert> 18#include <iomanip> 19#include <sstream> 20#include <string> 21 22#if USE_UDIS86 23#include <udis86.h> 24#endif 25 26using namespace llvm; 27 28bool llvm::sys::hasDisassembler() 29{ 30#if defined (__i386__) || defined (__amd64__) || defined (__x86_64__) 31 // We have option to enable udis86 library. 32# if USE_UDIS86 33 return true; 34#else 35 return false; 36#endif 37#else 38 return false; 39#endif 40} 41 42std::string llvm::sys::disassembleBuffer(uint8_t* start, size_t length, 43 uint64_t pc) { 44#if (defined (__i386__) || defined (__amd64__) || defined (__x86_64__)) \ 45 && USE_UDIS86 46 std::stringstream res; 47 48 unsigned bits; 49# if defined(__i386__) 50 bits = 32; 51# else 52 bits = 64; 53# endif 54 55 ud_t ud_obj; 56 57 ud_init(&ud_obj); 58 ud_set_input_buffer(&ud_obj, start, length); 59 ud_set_mode(&ud_obj, bits); 60 ud_set_pc(&ud_obj, pc); 61 ud_set_syntax(&ud_obj, UD_SYN_ATT); 62 63 res << std::setbase(16) 64 << std::setw(bits/4); 65 66 while (ud_disassemble(&ud_obj)) { 67 res << ud_insn_off(&ud_obj) << ":\t" << ud_insn_asm(&ud_obj) << "\n"; 68 } 69 70 return res.str(); 71#else 72 return "No disassembler available. See configure help for options.\n"; 73#endif 74} 75