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https://github.com/abseil/abseil-cpp.git
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3b1bb73373
Together with the frame sizes already being returned, this gives us the bounds on each stack frame. Note that this may slightly affect MSVC in debug builds, as it does not respect ABSL_ATTRIBUTE_ALWAYS_INLINE without optimizations. To remedy this, either enable inlining (/Ob1 or higher), or write a wrapper that ensures any stack traces obtained are robust to frames being added (such as by manually filtering everything below the caller). Do not depend on the new APIs publicly. They are subject to change or removal. PiperOrigin-RevId: 740075920 Change-Id: I6cd0909e7be3af4c9f32d39633230f655946b6a8
58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
// Copyright 2025 The Abseil 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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// https://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 ABSL_DEBUGGING_INTERNAL_ADDRESSES_H_
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#define ABSL_DEBUGGING_INTERNAL_ADDRESSES_H_
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#include <stdint.h>
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#include "absl/base/config.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace debugging_internal {
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// Removes any metadata (tag bits) from the given pointer, converting it into a
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// user-readable address.
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inline uintptr_t StripPointerMetadata(uintptr_t ptr) {
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#if defined(__aarch64__)
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// When PAC-RET (-mbranch-protection=pac-ret) is enabled, return addresses
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// stored on the stack will be signed, which means that pointer bits outside
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// of the virtual address range are potentially set. Since the stacktrace code
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// is expected to return normal code pointers, this function clears those
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// bits.
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register uintptr_t x30 __asm__("x30") = ptr;
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// The normal instruction for clearing PAC bits is XPACI, but for
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// compatibility with ARM platforms that do not support pointer
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// authentication, we use the hint space instruction XPACLRI instead. Hint
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// space instructions behave as NOPs on unsupported platforms.
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#define ABSL_XPACLRI_HINT "hint #0x7;"
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asm(ABSL_XPACLRI_HINT : "+r"(x30)); // asm("xpaclri" : "+r"(x30));
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#undef ABSL_XPACLRI_HINT
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return x30;
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#else
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return ptr;
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#endif
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}
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inline uintptr_t StripPointerMetadata(void* ptr) {
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return StripPointerMetadata(reinterpret_cast<uintptr_t>(ptr));
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}
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} // namespace debugging_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_DEBUGGING_INTERNAL_ADDRESSES_H_
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