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/Config/config.h" 16#include "llvm/Support/Disassembler.h" 17 18#include <cassert> 19#include <iomanip> 20#include <string> 21#include <sstream> 22 23#if USE_UDIS86 24#include <udis86.h> 25#endif 26 27using namespace llvm; 28 29bool llvm::sys::hasDisassembler() 30{ 31#if defined (__i386__) || defined (__amd64__) || defined (__x86_64__) 32 // We have option to enable udis86 library. 33# if USE_UDIS86 34 return true; 35#else 36 return false; 37#endif 38#else 39 return false; 40#endif 41} 42 43std::string llvm::sys::disassembleBuffer(uint8_t* start, size_t length, 44 uint64_t pc) { 45 std::stringstream res; 46 47#if (defined (__i386__) || defined (__amd64__) || defined (__x86_64__)) \ 48 && USE_UDIS86 49 unsigned bits; 50# if defined(__i386__) 51 bits = 32; 52# else 53 bits = 64; 54# endif 55 56 ud_t ud_obj; 57 58 ud_init(&ud_obj); 59 ud_set_input_buffer(&ud_obj, start, length); 60 ud_set_mode(&ud_obj, bits); 61 ud_set_pc(&ud_obj, pc); 62 ud_set_syntax(&ud_obj, UD_SYN_ATT); 63 64 res << std::setbase(16) 65 << std::setw(bits/4); 66 67 while (ud_disassemble(&ud_obj)) { 68 res << ud_insn_off(&ud_obj) << ":\t" << ud_insn_asm(&ud_obj) << "\n"; 69 } 70#else 71 res << "No disassembler available. See configure help for options.\n"; 72#endif 73 74 return res.str(); 75} 76