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<li class="navelem"><a class="el" href="../../dir_68267d1309a1af8e8297ef4c3efbcdba.html">src</a></li><li class="navelem"><a class="el" href="../../dir_84420232f7d21f2837bd8f918b6fc033.html">obf</a></li><li class="navelem"><a class="el" href="../../dir_dca6cbf37515070a04f03d98baa5bc62.html">passes</a></li> </ul>
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<div class="title">next_inst_pass.cpp</div> </div>
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<a href="../../df/d7d/next__inst__pass_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright (c) 2022, _xeroxz</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// All rights reserved.</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// Redistribution and use in source and binary forms, with or without</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// modification, are permitted provided that the following conditions are met:</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// 1. Redistributions of source code must retain the above copyright notice,</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// this list of conditions and the following disclaimer.</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// this list of conditions and the following disclaimer in the documentation</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// and/or other materials provided with the distribution.</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// 3. Neither the name of the copyright holder nor the names of its</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// contributors may be used to endorse or promote products derived from</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// this software without specific prior written permission.</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// POSSIBILITY OF SUCH DAMAGE.</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <<a class="code" href="../../d5/d54/next__inst__pass_8hpp.html">obf/passes/next_inst_pass.hpp</a>></span></div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  </div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">namespace </span><a class="code" href="../../d5/da8/namespacetheo_1_1obf.html">theo::obf</a> {</div>
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<div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html#a964e6f5291ccba0442519f2563b3a2e9"> 34</a></span> <a class="code" href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html">next_inst_pass_t</a>* <a class="code" href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html#a964e6f5291ccba0442519f2563b3a2e9">next_inst_pass_t::get</a>() {</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keyword">static</span> <a class="code" href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html">next_inst_pass_t</a> obj;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">return</span> &obj;</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> }</div>
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<div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html#ae4cbba78b14c2b9da794386e4d92f40f"> 38</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html#ae4cbba78b14c2b9da794386e4d92f40f">next_inst_pass_t::run</a>(<a class="code" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html">decomp::symbol_t</a>* sym) {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  std::optional<recomp::reloc_t*> reloc;</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">if</span> (!(reloc = has_next_inst_reloc(sym)).has_value())</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  xed_decoded_inst_t inst = m_tmp_inst;</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  std::vector<std::uint8_t> new_inst_bytes =</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <a class="code" href="../../d8/d82/namespacetheo_1_1obf_1_1transform.html#a416c6c93ce55a4ab9f70592951d15704">transform::generate</a>(&inst, reloc.value(), 3, 6);</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// add a push [rip+offset] and update reloc->offset()...</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">//</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  std::uint32_t inst_len = {};</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  std::uint8_t inst_buff[XED_MAX_INSTRUCTION_BYTES];</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  </div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  xed_error_enum_t err;</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  xed_encoder_request_t req;</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  xed_state_t istate{XED_MACHINE_MODE_LONG_64, XED_ADDRESS_WIDTH_64b};</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  xed_encoder_request_zero_set_mode(&req, &istate);</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  xed_encoder_request_set_effective_operand_width(&req, 64);</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  xed_encoder_request_set_iclass(&req, XED_ICLASS_PUSH);</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  </div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  xed_encoder_request_set_mem0(&req);</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  xed_encoder_request_set_operand_order(&req, 0, XED_OPERAND_MEM0);</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  xed_encoder_request_set_base0(&req, XED_REG_RIP);</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  xed_encoder_request_set_seg0(&req, XED_REG_INVALID);</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  xed_encoder_request_set_index(&req, XED_REG_INVALID);</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  xed_encoder_request_set_scale(&req, 0);</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  </div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  xed_encoder_request_set_memory_operand_length(&req, 8);</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  xed_encoder_request_set_memory_displacement(&req, new_inst_bytes.size() + 1,</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  1);</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  </div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">if</span> ((err = xed_encode(&req, inst_buff, <span class="keyword">sizeof</span>(inst_buff), &inst_len)) !=</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  XED_ERROR_NONE) {</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  spdlog::info(<span class="stringliteral">"failed to encode instruction... reason: {}"</span>,</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  xed_error_enum_t2str(err));</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  </div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  assert(err == XED_ERROR_NONE);</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  </div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  new_inst_bytes.insert(new_inst_bytes.begin(), inst_buff,</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  inst_buff + inst_len);</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">// put a return instruction at the end of the decrypt instructions...</span></div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">//</span></div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  new_inst_bytes.push_back(0xC3);</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  </div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  sym-><a class="code" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#aa3ecf0b480d10bffe68812409c06d61b">data</a>().insert(sym-><a class="code" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#aa3ecf0b480d10bffe68812409c06d61b">data</a>().end(), new_inst_bytes.begin(),</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  new_inst_bytes.end());</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  </div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  reloc.value()->offset(sym-><a class="code" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#aa3ecf0b480d10bffe68812409c06d61b">data</a>().size());</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  sym-><a class="code" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#aa3ecf0b480d10bffe68812409c06d61b">data</a>().resize(sym-><a class="code" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#aa3ecf0b480d10bffe68812409c06d61b">data</a>().size() + 8);</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> }</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  </div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> std::optional<recomp::reloc_t*> next_inst_pass_t::has_next_inst_reloc(</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <a class="code" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html">decomp::symbol_t</a>* sym) {</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keyword">auto</span> res = std::find_if(</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  sym-><a class="code" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#abc158e1dc1567161f0a57ed15fc718f7">relocs</a>().begin(), sym-><a class="code" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#abc158e1dc1567161f0a57ed15fc718f7">relocs</a>().end(),</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  [&](<a class="code" href="../../dd/d37/classtheo_1_1recomp_1_1reloc__t.html">recomp::reloc_t</a>& reloc) -> <span class="keywordtype">bool</span> { return !reloc.offset(); });</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  </div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">return</span> res != sym-><a class="code" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#abc158e1dc1567161f0a57ed15fc718f7">relocs</a>().end() ? &(*res)</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  : std::optional<recomp::reloc_t*>();</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> }</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> } <span class="comment">// namespace theo::obf</span></div>
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<div class="ttc" id="aclasstheo_1_1decomp_1_1symbol__t_html"><div class="ttname"><a href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html">theo::decomp::symbol_t</a></div><div class="ttdoc">symbol_t is an abstraction upon the coff symbol. this allows for easier manipulation of the symbol....</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d62/symbol_8hpp_source.html#l00053">symbol.hpp:53</a></div></div>
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<div class="ttc" id="aclasstheo_1_1decomp_1_1symbol__t_html_aa3ecf0b480d10bffe68812409c06d61b"><div class="ttname"><a href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#aa3ecf0b480d10bffe68812409c06d61b">theo::decomp::symbol_t::data</a></div><div class="ttdeci">std::vector< std::uint8_t > & data()</div><div class="ttdoc">returns a vector by reference of bytes containing the data of the symbol.</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d67/symbol_8cpp_source.html#l00076">symbol.cpp:76</a></div></div>
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<div class="ttc" id="aclasstheo_1_1decomp_1_1symbol__t_html_abc158e1dc1567161f0a57ed15fc718f7"><div class="ttname"><a href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#abc158e1dc1567161f0a57ed15fc718f7">theo::decomp::symbol_t::relocs</a></div><div class="ttdeci">std::vector< recomp::reloc_t > & relocs()</div><div class="ttdoc">returns a vector of relocations.</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d67/symbol_8cpp_source.html#l00096">symbol.cpp:96</a></div></div>
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<div class="ttc" id="aclasstheo_1_1obf_1_1next__inst__pass__t_html"><div class="ttname"><a href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html">theo::obf::next_inst_pass_t</a></div><div class="ttdoc">This pass is used to generate transformations and jmp code to change RIP to the next instruction.</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d54/next__inst__pass_8hpp_source.html#l00085">next_inst_pass.hpp:85</a></div></div>
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<div class="ttc" id="aclasstheo_1_1obf_1_1next__inst__pass__t_html_a964e6f5291ccba0442519f2563b3a2e9"><div class="ttname"><a href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html#a964e6f5291ccba0442519f2563b3a2e9">theo::obf::next_inst_pass_t::get</a></div><div class="ttdeci">static next_inst_pass_t * get()</div><div class="ttdef"><b>Definition:</b> <a href="../../df/d7d/next__inst__pass_8cpp_source.html#l00034">next_inst_pass.cpp:34</a></div></div>
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<div class="ttc" id="aclasstheo_1_1obf_1_1next__inst__pass__t_html_ae4cbba78b14c2b9da794386e4d92f40f"><div class="ttname"><a href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html#ae4cbba78b14c2b9da794386e4d92f40f">theo::obf::next_inst_pass_t::run</a></div><div class="ttdeci">void run(decomp::symbol_t *sym)</div><div class="ttdoc">virtual method which must be implimented by the pass that inherits this class.</div><div class="ttdef"><b>Definition:</b> <a href="../../df/d7d/next__inst__pass_8cpp_source.html#l00038">next_inst_pass.cpp:38</a></div></div>
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<div class="ttc" id="aclasstheo_1_1recomp_1_1reloc__t_html"><div class="ttname"><a href="../../dd/d37/classtheo_1_1recomp_1_1reloc__t.html">theo::recomp::reloc_t</a></div><div class="ttdoc">meta data about a relocation for a symbol</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d82/reloc_8hpp_source.html#l00041">reloc.hpp:41</a></div></div>
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<div class="ttc" id="anamespacetheo_1_1obf_1_1transform_html_a416c6c93ce55a4ab9f70592951d15704"><div class="ttname"><a href="../../d8/d82/namespacetheo_1_1obf_1_1transform.html#a416c6c93ce55a4ab9f70592951d15704">theo::obf::transform::generate</a></div><div class="ttdeci">std::vector< std::uint8_t > generate(xed_decoded_inst_t *inst, recomp::reloc_t *reloc, std::uint8_t low, std::uint8_t high)</div><div class="ttdoc">generate a sequence of transformations given an instruction that has a relocation in it.</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d18/gen_8hpp_source.html#l00045">gen.hpp:45</a></div></div>
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<div class="ttc" id="anamespacetheo_1_1obf_html"><div class="ttname"><a href="../../d5/da8/namespacetheo_1_1obf.html">theo::obf</a></div><div class="ttdoc">this is the main namespace for obfuscation related things.</div><div class="ttdef"><b>Definition:</b> <a href="../../de/d46/engine_8hpp_source.html#l00036">engine.hpp:36</a></div></div>
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<div class="ttc" id="anext__inst__pass_8hpp_html"><div class="ttname"><a href="../../d5/d54/next__inst__pass_8hpp.html">next_inst_pass.hpp</a></div></div>
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