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annotate lib/Support/Disassembler.cpp @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children
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1 //===- lib/Support/Disassembler.cpp -----------------------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the necessary glue to call external disassembler
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11 // libraries.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/Support/Disassembler.h"
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16 #include "llvm/Config/config.h"
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17 #include <cassert>
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18 #include <iomanip>
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19 #include <sstream>
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20 #include <string>
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21
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22 #if USE_UDIS86
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23 #include <udis86.h>
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24 #endif
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25
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26 using namespace llvm;
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27
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28 bool llvm::sys::hasDisassembler()
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29 {
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30 #if defined (__i386__) || defined (__amd64__) || defined (__x86_64__)
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31 // We have option to enable udis86 library.
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32 # if USE_UDIS86
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33 return true;
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34 #else
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35 return false;
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36 #endif
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37 #else
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38 return false;
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39 #endif
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40 }
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41
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42 std::string llvm::sys::disassembleBuffer(uint8_t* start, size_t length,
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43 uint64_t pc) {
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44 #if (defined (__i386__) || defined (__amd64__) || defined (__x86_64__)) \
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45 && USE_UDIS86
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46 std::stringstream res;
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47
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48 unsigned bits;
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49 # if defined(__i386__)
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50 bits = 32;
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51 # else
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52 bits = 64;
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53 # endif
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54
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55 ud_t ud_obj;
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56
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57 ud_init(&ud_obj);
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58 ud_set_input_buffer(&ud_obj, start, length);
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59 ud_set_mode(&ud_obj, bits);
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60 ud_set_pc(&ud_obj, pc);
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61 ud_set_syntax(&ud_obj, UD_SYN_ATT);
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62
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63 res << std::setbase(16)
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64 << std::setw(bits/4);
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65
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66 while (ud_disassemble(&ud_obj)) {
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67 res << ud_insn_off(&ud_obj) << ":\t" << ud_insn_asm(&ud_obj) << "\n";
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68 }
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69
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70 return res.str();
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71 #else
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72 return "No disassembler available. See configure help for options.\n";
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73 #endif
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74 }