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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /layout/style/nsRuleData.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'layout/style/nsRuleData.cpp')
-rw-r--r--layout/style/nsRuleData.cpp55
1 files changed, 55 insertions, 0 deletions
diff --git a/layout/style/nsRuleData.cpp b/layout/style/nsRuleData.cpp
new file mode 100644
index 000000000..a4ad5268a
--- /dev/null
+++ b/layout/style/nsRuleData.cpp
@@ -0,0 +1,55 @@
+/* -*- 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