The Tor Browser: layout/base/nsAutoLayoutPhase.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef DEBUG

     7 static_assert(false, "This should not be compiled in !DEBUG");

     8 #endif // DEBUG

    10 #include "nsAutoLayoutPhase.h"

    11 #include "nsPresContext.h"

    12 #include "nsContentUtils.h"

    14 nsAutoLayoutPhase::nsAutoLayoutPhase(nsPresContext* aPresContext,

    15                                      nsLayoutPhase aPhase)

    16   : mPresContext(aPresContext)

    17   , mPhase(aPhase)

    18   , mCount(0)

    19 {

    20   Enter();

    21 }

    23 nsAutoLayoutPhase::~nsAutoLayoutPhase()

    24 {

    25   Exit();

    26   MOZ_ASSERT(mCount == 0, "imbalanced");

    27 }

    29 void

    30 nsAutoLayoutPhase::Enter()

    31 {

    32   switch (mPhase) {

    33     case eLayoutPhase_Paint:

    34       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,

    35                  "recurring into paint");

    36       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,

    37                  "painting in the middle of reflow");

    38       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,

    39                  "painting in the middle of frame construction");

    40       break;

    41     case eLayoutPhase_Reflow:

    42       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,

    43                  "reflowing in the middle of a paint");

    44       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,

    45                  "recurring into reflow");

    46       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,

    47                  "reflowing in the middle of frame construction");

    48       break;

    49     case eLayoutPhase_FrameC:

    50       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,

    51                  "constructing frames in the middle of a paint");

    52       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,

    53                  "constructing frames in the middle of reflow");

    54       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,

    55                  "recurring into frame construction");

    56       MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript(),

    57                  "constructing frames and scripts are not blocked");

    58       break;

    59     case eLayoutPhase_COUNT:

    60       break;

    61   }

    63   ++(mPresContext->mLayoutPhaseCount[mPhase]);

    64   ++mCount;

    65 }

    67 void

    68 nsAutoLayoutPhase::Exit()

    69 {

    70   MOZ_ASSERT(mCount > 0 && mPresContext->mLayoutPhaseCount[mPhase] > 0,

    71              "imbalanced");

    72   --(mPresContext->mLayoutPhaseCount[mPhase]);

    73   --mCount;

    74 }

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