81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/IncrementalClearCOMRuleArray.h"
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#include <algorithm> // For std::min
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#include "nsCycleCollector.h"
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#include "mozilla/DeferredFinalize.h"
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#include "nsTArray.h"
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#include "nsCCUncollectableMarker.h"
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using namespace mozilla;
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typedef nsCOMArray<css::Rule> RuleArray;
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typedef nsTArray<RuleArray> RuleArrayArray;
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// These methods are based on those in DeferredFinalizerImpl.
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static void*
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AppendRulesArrayPointer(void* aData, void* aObject)
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{
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RuleArrayArray* rulesArray = static_cast<RuleArrayArray*>(aData);
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RuleArray* oldRules = static_cast<RuleArray*>(aObject);
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if (!rulesArray) {
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rulesArray = new RuleArrayArray();
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}
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RuleArray* newRules = rulesArray->AppendElement();
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newRules->SwapElements(*oldRules);
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return rulesArray;
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}
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// Remove up to |aSliceBudget| css::Rules from the arrays, starting at
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// the end of the last array.
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static bool
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DeferredFinalizeRulesArray(uint32_t aSliceBudget, void* aData)
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{
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MOZ_ASSERT(aSliceBudget > 0, "nonsensical/useless call with aSliceBudget == 0");
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RuleArrayArray* rulesArray = static_cast<RuleArrayArray*>(aData);
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size_t newOuterLen = rulesArray->Length();
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while (aSliceBudget > 0 && newOuterLen > 0) {
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RuleArray& lastArray = rulesArray->ElementAt(newOuterLen - 1);
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uint32_t innerLen = lastArray.Length();
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uint32_t currSlice = std::min(innerLen, aSliceBudget);
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uint32_t newInnerLen = innerLen - currSlice;
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lastArray.TruncateLength(newInnerLen);
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aSliceBudget -= currSlice;
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if (newInnerLen == 0) {
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newOuterLen -= 1;
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}
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}
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rulesArray->TruncateLength(newOuterLen);
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if (newOuterLen == 0) {
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delete rulesArray;
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return true;
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}
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return false;
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}
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void
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IncrementalClearCOMRuleArray::Clear()
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{
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// Destroy the array incrementally if it is long and we
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// haven't started shutting down.
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if (Length() > 10 && nsCCUncollectableMarker::sGeneration) {
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DeferredFinalize(AppendRulesArrayPointer, DeferredFinalizeRulesArray, this);
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} else {
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nsCOMArray<css::Rule>::Clear();
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}
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MOZ_ASSERT(Length() == 0);
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}
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