hphp/util/eh-frame-inl.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15 */
  16
  17 namespace HPHP {
  18
  19 ///////////////////////////////////////////////////////////////////////////////
  20
  21 inline const uint8_t* EHFrameDesc::Entry::get() const {
  22   return &m_vec[m_idx];
  23 }
  24
  25 inline uint32_t EHFrameDesc::Entry::length() const {
  26   return *(uint32_t*)(&m_vec[m_idx]);
  27 }
  28
  29 inline uint32_t EHFrameDesc::Entry::cie_off() const {
  30   return *(uint32_t*)(&m_vec[m_idx + sizeof(uint32_t)]);
  31 }
  32
  33 inline CodeAddress EHFrameDesc::FDE::start() const {
  34   auto constexpr off = sizeof(uint32_t) + sizeof(uint32_t);
  35   return *(CodeAddress*)(&m_vec[m_idx + off]);
  36 }
  37
  38 inline size_t EHFrameDesc::FDE::range() const {
  39   auto constexpr off = sizeof(uint32_t) + sizeof(uint32_t) +
  40                        sizeof(CodeAddress);
  41   return *(size_t*)(&m_vec[m_idx + off]);
  42 }
  43
  44 ///////////////////////////////////////////////////////////////////////////////
  45
  46 inline EHFrameDesc::CIE EHFrameDesc::cie() const {
  47   assertx(m_buf != nullptr);
  48   return CIE(*m_buf, 0);
  49 }
  50
  51 template <class F>
  52 inline void EHFrameDesc::for_each_fde(F f) const {
  53   assertx(m_buf != nullptr);
  54
  55   auto const cie_len = cie().length();
  56   auto idx = sizeof(cie_len) + cie_len;
  57
  58   while (idx < m_buf->size()) {
  59     auto fde = FDE(*m_buf, idx);
  60     auto const fde_len = fde.length();
  61
  62     if (fde_len != 0) f(fde); // skip the null-terminating FDE
  63
  64     idx += sizeof(fde_len) + fde_len;
  65     assertx(fde_len != 0 || idx == m_buf->size());
  66   }
  67 }
  68
  69 ///////////////////////////////////////////////////////////////////////////////
  70
  71 }