The Tor Browser / annotate

dom/smil/nsSMILInstanceTime.cpp@97036ab72558 (annotated)

dom/smil/nsSMILInstanceTime.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Tue, 06 Jan 2015 21:39:09 +0100
branch
TOR_BUG_9701
changeset 8
97036ab72558
permissions
-rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0 2 /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0 3 * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0 5
michael@0 6 #include "nsSMILInstanceTime.h"
michael@0 7 #include "nsSMILInterval.h"
michael@0 8 #include "nsSMILTimeValueSpec.h"
michael@0 9 #include "mozilla/AutoRestore.h"
michael@0 10
michael@0 11 //----------------------------------------------------------------------
michael@0 12 // Implementation
michael@0 13
michael@0 14 nsSMILInstanceTime::nsSMILInstanceTime(const nsSMILTimeValue& aTime,
michael@0 15 nsSMILInstanceTimeSource aSource,
michael@0 16 nsSMILTimeValueSpec* aCreator,
michael@0 17 nsSMILInterval* aBaseInterval)
michael@0 18 : mTime(aTime),
michael@0 19 mFlags(0),
michael@0 20 mVisited(false),
michael@0 21 mFixedEndpointRefCnt(0),
michael@0 22 mSerial(0),
michael@0 23 mCreator(aCreator),
michael@0 24 mBaseInterval(nullptr) // This will get set to aBaseInterval in a call to
michael@0 25 // SetBaseInterval() at end of constructor
michael@0 26 {
michael@0 27 switch (aSource) {
michael@0 28 case SOURCE_NONE:
michael@0 29 // No special flags
michael@0 30 break;
michael@0 31
michael@0 32 case SOURCE_DOM:
michael@0 33 mFlags = kDynamic | kFromDOM;
michael@0 34 break;
michael@0 35
michael@0 36 case SOURCE_SYNCBASE:
michael@0 37 mFlags = kMayUpdate;
michael@0 38 break;
michael@0 39
michael@0 40 case SOURCE_EVENT:
michael@0 41 mFlags = kDynamic;
michael@0 42 break;
michael@0 43 }
michael@0 44
michael@0 45 SetBaseInterval(aBaseInterval);
michael@0 46 }
michael@0 47
michael@0 48 nsSMILInstanceTime::~nsSMILInstanceTime()
michael@0 49 {
michael@0 50 NS_ABORT_IF_FALSE(!mBaseInterval,
michael@0 51 "Destroying instance time without first calling Unlink()");
michael@0 52 NS_ABORT_IF_FALSE(mFixedEndpointRefCnt == 0,
michael@0 53 "Destroying instance time that is still used as the fixed endpoint of an "
michael@0 54 "interval");
michael@0 55 }
michael@0 56
michael@0 57 void
michael@0 58 nsSMILInstanceTime::Unlink()
michael@0 59 {
michael@0 60 nsRefPtr<nsSMILInstanceTime> deathGrip(this);
michael@0 61 if (mBaseInterval) {
michael@0 62 mBaseInterval->RemoveDependentTime(*this);
michael@0 63 mBaseInterval = nullptr;
michael@0 64 }
michael@0 65 mCreator = nullptr;
michael@0 66 }
michael@0 67
michael@0 68 void
michael@0 69 nsSMILInstanceTime::HandleChangedInterval(
michael@0 70 const nsSMILTimeContainer* aSrcContainer,
michael@0 71 bool aBeginObjectChanged,
michael@0 72 bool aEndObjectChanged)
michael@0 73 {
michael@0 74 // It's possible a sequence of notifications might cause our base interval to
michael@0 75 // be updated and then deleted. Furthermore, the delete might happen whilst
michael@0 76 // we're still in the queue to be notified of the change. In any case, if we
michael@0 77 // don't have a base interval, just ignore the change.
michael@0 78 if (!mBaseInterval)
michael@0 79 return;
michael@0 80
michael@0 81 NS_ABORT_IF_FALSE(mCreator, "Base interval is set but creator is not.");
michael@0 82
michael@0 83 if (mVisited) {
michael@0 84 // Break the cycle here
michael@0 85 Unlink();
michael@0 86 return;
michael@0 87 }
michael@0 88
michael@0 89 bool objectChanged = mCreator->DependsOnBegin() ? aBeginObjectChanged :
michael@0 90 aEndObjectChanged;
michael@0 91
michael@0 92 mozilla::AutoRestore<bool> setVisited(mVisited);
michael@0 93 mVisited = true;
michael@0 94
michael@0 95 nsRefPtr<nsSMILInstanceTime> deathGrip(this);
michael@0 96 mCreator->HandleChangedInstanceTime(*GetBaseTime(), aSrcContainer, *this,
michael@0 97 objectChanged);
michael@0 98 }
michael@0 99
michael@0 100 void
michael@0 101 nsSMILInstanceTime::HandleDeletedInterval()
michael@0 102 {
michael@0 103 NS_ABORT_IF_FALSE(mBaseInterval,
michael@0 104 "Got call to HandleDeletedInterval on an independent instance time");
michael@0 105 NS_ABORT_IF_FALSE(mCreator, "Base interval is set but creator is not");
michael@0 106
michael@0 107 mBaseInterval = nullptr;
michael@0 108 mFlags &= ~kMayUpdate; // Can't update without a base interval
michael@0 109
michael@0 110 nsRefPtr<nsSMILInstanceTime> deathGrip(this);
michael@0 111 mCreator->HandleDeletedInstanceTime(*this);
michael@0 112 mCreator = nullptr;
michael@0 113 }
michael@0 114
michael@0 115 void
michael@0 116 nsSMILInstanceTime::HandleFilteredInterval()
michael@0 117 {
michael@0 118 NS_ABORT_IF_FALSE(mBaseInterval,
michael@0 119 "Got call to HandleFilteredInterval on an independent instance time");
michael@0 120
michael@0 121 mBaseInterval = nullptr;
michael@0 122 mFlags &= ~kMayUpdate; // Can't update without a base interval
michael@0 123 mCreator = nullptr;
michael@0 124 }
michael@0 125
michael@0 126 bool
michael@0 127 nsSMILInstanceTime::ShouldPreserve() const
michael@0 128 {
michael@0 129 return mFixedEndpointRefCnt > 0 || (mFlags & kWasDynamicEndpoint);
michael@0 130 }
michael@0 131
michael@0 132 void
michael@0 133 nsSMILInstanceTime::UnmarkShouldPreserve()
michael@0 134 {
michael@0 135 mFlags &= ~kWasDynamicEndpoint;
michael@0 136 }
michael@0 137
michael@0 138 void
michael@0 139 nsSMILInstanceTime::AddRefFixedEndpoint()
michael@0 140 {
michael@0 141 NS_ABORT_IF_FALSE(mFixedEndpointRefCnt < UINT16_MAX,
michael@0 142 "Fixed endpoint reference count upper limit reached");
michael@0 143 ++mFixedEndpointRefCnt;
michael@0 144 mFlags &= ~kMayUpdate; // Once fixed, always fixed
michael@0 145 }
michael@0 146
michael@0 147 void
michael@0 148 nsSMILInstanceTime::ReleaseFixedEndpoint()
michael@0 149 {
michael@0 150 NS_ABORT_IF_FALSE(mFixedEndpointRefCnt > 0, "Duplicate release");
michael@0 151 --mFixedEndpointRefCnt;
michael@0 152 if (mFixedEndpointRefCnt == 0 && IsDynamic()) {
michael@0 153 mFlags |= kWasDynamicEndpoint;
michael@0 154 }
michael@0 155 }
michael@0 156
michael@0 157 bool
michael@0 158 nsSMILInstanceTime::IsDependentOn(const nsSMILInstanceTime& aOther) const
michael@0 159 {
michael@0 160 if (mVisited)
michael@0 161 return false;
michael@0 162
michael@0 163 const nsSMILInstanceTime* myBaseTime = GetBaseTime();
michael@0 164 if (!myBaseTime)
michael@0 165 return false;
michael@0 166
michael@0 167 if (myBaseTime == &aOther)
michael@0 168 return true;
michael@0 169
michael@0 170 mozilla::AutoRestore<bool> setVisited(mVisited);
michael@0 171 mVisited = true;
michael@0 172 return myBaseTime->IsDependentOn(aOther);
michael@0 173 }
michael@0 174
michael@0 175 const nsSMILInstanceTime*
michael@0 176 nsSMILInstanceTime::GetBaseTime() const
michael@0 177 {
michael@0 178 if (!mBaseInterval) {
michael@0 179 return nullptr;
michael@0 180 }
michael@0 181
michael@0 182 NS_ABORT_IF_FALSE(mCreator, "Base interval is set but there is no creator.");
michael@0 183 if (!mCreator) {
michael@0 184 return nullptr;
michael@0 185 }
michael@0 186
michael@0 187 return mCreator->DependsOnBegin() ? mBaseInterval->Begin() :
michael@0 188 mBaseInterval->End();
michael@0 189 }
michael@0 190
michael@0 191 void
michael@0 192 nsSMILInstanceTime::SetBaseInterval(nsSMILInterval* aBaseInterval)
michael@0 193 {
michael@0 194 NS_ABORT_IF_FALSE(!mBaseInterval,
michael@0 195 "Attempting to reassociate an instance time with a different interval.");
michael@0 196
michael@0 197 if (aBaseInterval) {
michael@0 198 NS_ABORT_IF_FALSE(mCreator,
michael@0 199 "Attempting to create a dependent instance time without reference "
michael@0 200 "to the creating nsSMILTimeValueSpec object.");
michael@0 201 if (!mCreator)
michael@0 202 return;
michael@0 203
michael@0 204 aBaseInterval->AddDependentTime(*this);
michael@0 205 }
michael@0 206
michael@0 207 mBaseInterval = aBaseInterval;
michael@0 208 }

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