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