forked from mirrors/gecko-dev
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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 "nsRuleData.h"
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#include "mozilla/Poison.h"
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#include <stdint.h>
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inline size_t
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nsRuleData::GetPoisonOffset()
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{
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// Fill in mValueOffsets such that mValueStorage + mValueOffsets[i]
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// will yield the frame poison value for all uninitialized value
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// offsets.
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static_assert(sizeof(uintptr_t) == sizeof(size_t),
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"expect uintptr_t and size_t to be the same size");
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static_assert(uintptr_t(-1) > uintptr_t(0),
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"expect uintptr_t to be unsigned");
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static_assert(size_t(-1) > size_t(0),
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"expect size_t to be unsigned");
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uintptr_t framePoisonValue = mozPoisonValue();
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return size_t(framePoisonValue - uintptr_t(mValueStorage)) /
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sizeof(nsCSSValue);
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}
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nsRuleData::nsRuleData(uint32_t aSIDs, nsCSSValue* aValueStorage,
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nsPresContext* aContext, nsStyleContext* aStyleContext)
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: mSIDs(aSIDs),
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mPresContext(aContext),
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mStyleContext(aStyleContext),
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mValueStorage(aValueStorage)
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{
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#ifndef MOZ_VALGRIND
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size_t framePoisonOffset = GetPoisonOffset();
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for (size_t i = 0; i < nsStyleStructID_Length; ++i) {
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mValueOffsets[i] = framePoisonOffset;
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}
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#endif
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}
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#ifdef DEBUG
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nsRuleData::~nsRuleData()
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{
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#ifndef MOZ_VALGRIND
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// assert nothing in mSIDs has poison value
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size_t framePoisonOffset = GetPoisonOffset();
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for (size_t i = 0; i < nsStyleStructID_Length; ++i) {
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MOZ_ASSERT(!(mSIDs & (1 << i)) || mValueOffsets[i] != framePoisonOffset,
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"value in SIDs was left with poison offset");
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}
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#endif
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}
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#endif
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