hphp/runtime/base/surprise-flags.cpp

   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 #include "hphp/runtime/base/surprise-flags.h"
  18
  19 #include <type_traits>
  20
  21 namespace HPHP {
  22
  23 // NoHandleSurpriseScope is only implemented in DEBUG mode.
  24 #ifdef DEBUG
  25 namespace {
  26
  27 __thread int64_t tl_noSurpriseDepth[sizeof(SurpriseFlag)] = {0,};
  28 // Cache of flags with depth > 0.
  29 __thread SurpriseFlag tl_noSurpriseMask = static_cast<SurpriseFlag>(0);
  30
  31 void addNoSurpriseDepth(SurpriseFlag flags, int increment) {
  32   typename std::underlying_type<SurpriseFlag>::type mask = 0;
  33   for (size_t i = 0; i < sizeof(flags); ++i) {
  34     if (flags & (1ull << i)) tl_noSurpriseDepth[i] += increment;
  35     if (tl_noSurpriseDepth[i] > 0) mask |= (1ull << i);
  36   }
  37   tl_noSurpriseMask = static_cast<SurpriseFlag>(mask);
  38 }
  39
  40 }
  41
  42 void NoHandleSurpriseScope::AssertNone(SurpriseFlag flags) {
  43   assertx((flags & tl_noSurpriseMask) == 0);
  44 }
  45
  46 NoHandleSurpriseScope::NoHandleSurpriseScope(SurpriseFlag flags) {
  47   m_flags = flags;
  48   addNoSurpriseDepth(m_flags, 1);
  49 }
  50
  51 NoHandleSurpriseScope::~NoHandleSurpriseScope() {
  52   addNoSurpriseDepth(m_flags, -1);
  53 }
  54 #endif // DEBUG
  55
  56 }