tor-browser

The Tor Browser
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nsAutoLayoutPhase.cpp (3769B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef DEBUG
      8 static_assert(false, "This should not be compiled in !DEBUG");
      9 #endif  // DEBUG
     10 
     11 #include "nsAutoLayoutPhase.h"
     12 
     13 #include "nsContentUtils.h"
     14 #include "nsPresContext.h"
     15 
     16 nsAutoLayoutPhase::nsAutoLayoutPhase(nsPresContext* aPresContext,
     17                                     nsLayoutPhase aPhase)
     18    : mPresContext(aPresContext), mPhase(aPhase), mCount(0) {
     19  Enter();
     20 }
     21 
     22 nsAutoLayoutPhase::~nsAutoLayoutPhase() {
     23  Exit();
     24  MOZ_ASSERT(mCount == 0, "imbalanced");
     25 }
     26 
     27 void nsAutoLayoutPhase::Enter() {
     28  switch (mPhase) {
     29    case nsLayoutPhase::Paint:
     30      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::Paint] == 0,
     31                 "recurring into paint");
     32      MOZ_ASSERT(
     33          mPresContext->mLayoutPhaseCount[nsLayoutPhase::DisplayListBuilding] ==
     34              0,
     35          "recurring into paint from display list building");
     36      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::Reflow] == 0,
     37                 "painting in the middle of reflow");
     38      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::FrameC] == 0,
     39                 "painting in the middle of frame construction");
     40      break;
     41    case nsLayoutPhase::DisplayListBuilding:
     42      // It's fine and expected to be in a paint here.
     43      MOZ_ASSERT(
     44          mPresContext->mLayoutPhaseCount[nsLayoutPhase::DisplayListBuilding] ==
     45              0,
     46          "recurring into display list building");
     47      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::Reflow] == 0,
     48                 "display list building in the middle of reflow");
     49      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::FrameC] == 0,
     50                 "display list building in the middle of frame construction");
     51      break;
     52    case nsLayoutPhase::Reflow:
     53      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::Paint] == 0,
     54                 "reflowing in the middle of a paint");
     55      MOZ_ASSERT(
     56          mPresContext->mLayoutPhaseCount[nsLayoutPhase::DisplayListBuilding] ==
     57              0,
     58          "reflowing in the middle of a display list building");
     59      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::Reflow] == 0,
     60                 "recurring into reflow");
     61      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::FrameC] == 0,
     62                 "reflowing in the middle of frame construction");
     63      break;
     64    case nsLayoutPhase::FrameC:
     65      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::Paint] == 0,
     66                 "constructing frames in the middle of a paint");
     67      MOZ_ASSERT(
     68          mPresContext->mLayoutPhaseCount[nsLayoutPhase::DisplayListBuilding] ==
     69              0,
     70          "constructing frames in the middle of a display list building");
     71      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::Reflow] == 0,
     72                 "constructing frames in the middle of reflow");
     73      MOZ_ASSERT(mPresContext->mLayoutPhaseCount[nsLayoutPhase::FrameC] == 0,
     74                 "recurring into frame construction");
     75      MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript(),
     76                 "constructing frames and scripts are not blocked");
     77      break;
     78    case nsLayoutPhase::COUNT:
     79      break;
     80  }
     81 
     82  ++(mPresContext->mLayoutPhaseCount[mPhase]);
     83  ++mCount;
     84 }
     85 
     86 void nsAutoLayoutPhase::Exit() {
     87  MOZ_ASSERT(mCount > 0 && mPresContext->mLayoutPhaseCount[mPhase] > 0,
     88             "imbalanced");
     89  --(mPresContext->mLayoutPhaseCount[mPhase]);
     90  --mCount;
     91 }