/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include "nsRuleData.h" #include "mozilla/Poison.h" #include <stdint.h> inline size_t nsRuleData::GetPoisonOffset() { // Fill in mValueOffsets such that mValueStorage + mValueOffsets[i] // will yield the frame poison value for all uninitialized value // offsets. static_assert(sizeof(uintptr_t) == sizeof(size_t), "expect uintptr_t and size_t to be the same size"); static_assert(uintptr_t(-1) > uintptr_t(0), "expect uintptr_t to be unsigned"); static_assert(size_t(-1) > size_t(0), "expect size_t to be unsigned"); uintptr_t framePoisonValue = mozPoisonValue(); return size_t(framePoisonValue - uintptr_t(mValueStorage)) / sizeof(nsCSSValue); } nsRuleData::nsRuleData(uint32_t aSIDs, nsCSSValue* aValueStorage, nsPresContext* aContext, nsStyleContext* aStyleContext) : mSIDs(aSIDs), mPresContext(aContext), mStyleContext(aStyleContext), mValueStorage(aValueStorage) { #ifndef MOZ_VALGRIND size_t framePoisonOffset = GetPoisonOffset(); for (size_t i = 0; i < nsStyleStructID_Length; ++i) { mValueOffsets[i] = framePoisonOffset; } #endif } #ifdef DEBUG nsRuleData::~nsRuleData() { #ifndef MOZ_VALGRIND // assert nothing in mSIDs has poison value size_t framePoisonOffset = GetPoisonOffset(); for (size_t i = 0; i < nsStyleStructID_Length; ++i) { MOZ_ASSERT(!(mSIDs & (1 << i)) || mValueOffsets[i] != framePoisonOffset, "value in SIDs was left with poison offset"); } #endif } #endif