1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/style/nsRuleData.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,57 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "nsRuleData.h"
1.10 +
1.11 +#include "mozilla/Poison.h"
1.12 +#include <stdint.h>
1.13 +
1.14 +inline size_t
1.15 +nsRuleData::GetPoisonOffset()
1.16 +{
1.17 + // Fill in mValueOffsets such that mValueStorage + mValueOffsets[i]
1.18 + // will yield the frame poison value for all uninitialized value
1.19 + // offsets.
1.20 + static_assert(sizeof(uintptr_t) == sizeof(size_t),
1.21 + "expect uintptr_t and size_t to be the same size");
1.22 + static_assert(uintptr_t(-1) > uintptr_t(0),
1.23 + "expect uintptr_t to be unsigned");
1.24 + static_assert(size_t(-1) > size_t(0),
1.25 + "expect size_t to be unsigned");
1.26 + uintptr_t framePoisonValue = mozPoisonValue();
1.27 + return size_t(framePoisonValue - uintptr_t(mValueStorage)) /
1.28 + sizeof(nsCSSValue);
1.29 +}
1.30 +
1.31 +nsRuleData::nsRuleData(uint32_t aSIDs, nsCSSValue* aValueStorage,
1.32 + nsPresContext* aContext, nsStyleContext* aStyleContext)
1.33 + : mSIDs(aSIDs),
1.34 + mCanStoreInRuleTree(true),
1.35 + mPresContext(aContext),
1.36 + mStyleContext(aStyleContext),
1.37 + mValueStorage(aValueStorage)
1.38 +{
1.39 +#ifndef MOZ_VALGRIND
1.40 + size_t framePoisonOffset = GetPoisonOffset();
1.41 + for (size_t i = 0; i < nsStyleStructID_Length; ++i) {
1.42 + mValueOffsets[i] = framePoisonOffset;
1.43 + }
1.44 +#endif
1.45 +}
1.46 +
1.47 +#ifdef DEBUG
1.48 +nsRuleData::~nsRuleData()
1.49 +{
1.50 +#ifndef MOZ_VALGRIND
1.51 + // assert nothing in mSIDs has poison value
1.52 + size_t framePoisonOffset = GetPoisonOffset();
1.53 + for (size_t i = 0; i < nsStyleStructID_Length; ++i) {
1.54 + NS_ABORT_IF_FALSE(!(mSIDs & (1 << i)) ||
1.55 + mValueOffsets[i] != framePoisonOffset,
1.56 + "value in SIDs was left with poison offset");
1.57 + }
1.58 +#endif
1.59 +}
1.60 +#endif
