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