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7cbd8202e6
Use this for the BlockAllocator cast. Bug: dawn:1406 Change-Id: Ic5d1acf7f8e74037fb51fc9d5d3b5141a15bd962 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/89021 Commit-Queue: Ben Clayton <bclayton@google.com> Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Ben Clayton <bclayton@chromium.org> Reviewed-by: Antonio Maiorano <amaiorano@google.com>
40 lines
1.3 KiB
C++
40 lines
1.3 KiB
C++
// Copyright 2022 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_UTILS_BITCAST_H_
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#define SRC_TINT_UTILS_BITCAST_H_
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#include <cstring>
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namespace tint::utils {
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/// Bitcast performs a cast of `from` to the `TO` type using a memcpy.
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/// This unsafe cast avoids triggering Clang's Control Flow Integrity checks.
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/// See: crbug.com/dawn/1406
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/// See: https://clang.llvm.org/docs/ControlFlowIntegrity.html#bad-cast-checking
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/// @param from the value to cast
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/// @tparam TO the value to cast to
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/// @returns the cast value
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template <typename TO, typename FROM>
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inline TO Bitcast(FROM&& from) {
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static_assert(sizeof(FROM) == sizeof(TO));
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TO to;
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memcpy(&to, &from, sizeof(TO));
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return to;
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}
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} // namespace tint::utils
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#endif // SRC_TINT_UTILS_BITCAST_H_
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