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 #include "nsPresContext.h"
13 #include "nsContentUtils.h"
14
nsAutoLayoutPhase(nsPresContext * aPresContext,nsLayoutPhase aPhase)15 nsAutoLayoutPhase::nsAutoLayoutPhase(nsPresContext* aPresContext,
16 nsLayoutPhase aPhase)
17 : mPresContext(aPresContext), mPhase(aPhase), mCount(0) {
18 Enter();
19 }
20
~nsAutoLayoutPhase()21 nsAutoLayoutPhase::~nsAutoLayoutPhase() {
22 Exit();
23 MOZ_ASSERT(mCount == 0, "imbalanced");
24 }
25
Enter()26 void nsAutoLayoutPhase::Enter() {
27 switch (mPhase) {
28 case eLayoutPhase_Paint:
29 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
30 "recurring into paint");
31 MOZ_ASSERT(
32 mPresContext->mLayoutPhaseCount[eLayoutPhase_DisplayListBuilding] ==
33 0,
34 "recurring into paint from display list building");
35 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
36 "painting in the middle of reflow");
37 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
38 "painting in the middle of frame construction");
39 break;
40 case eLayoutPhase_DisplayListBuilding:
41 // It's fine and expected to be in a paint here.
42 MOZ_ASSERT(
43 mPresContext->mLayoutPhaseCount[eLayoutPhase_DisplayListBuilding] ==
44 0,
45 "recurring into display list building");
46 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
47 "display list building in the middle of reflow");
48 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
49 "display list building in the middle of frame construction");
50 break;
51 case eLayoutPhase_Reflow:
52 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
53 "reflowing in the middle of a paint");
54 MOZ_ASSERT(
55 mPresContext->mLayoutPhaseCount[eLayoutPhase_DisplayListBuilding] ==
56 0,
57 "reflowing in the middle of a display list building");
58 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
59 "recurring into reflow");
60 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
61 "reflowing in the middle of frame construction");
62 break;
63 case eLayoutPhase_FrameC:
64 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
65 "constructing frames in the middle of a paint");
66 MOZ_ASSERT(
67 mPresContext->mLayoutPhaseCount[eLayoutPhase_DisplayListBuilding] ==
68 0,
69 "constructing frames in the middle of a display list building");
70 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
71 "constructing frames in the middle of reflow");
72 MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
73 "recurring into frame construction");
74 MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript(),
75 "constructing frames and scripts are not blocked");
76 break;
77 case eLayoutPhase_COUNT:
78 break;
79 }
80
81 ++(mPresContext->mLayoutPhaseCount[mPhase]);
82 ++mCount;
83 }
84
Exit()85 void nsAutoLayoutPhase::Exit() {
86 MOZ_ASSERT(mCount > 0 && mPresContext->mLayoutPhaseCount[mPhase] > 0,
87 "imbalanced");
88 --(mPresContext->mLayoutPhaseCount[mPhase]);
89 --mCount;
90 }
91