| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| /* |
| * Implement fast stack unwinding for stack frames with frame pointers. Stores at most num_entries |
| * return addresses to buffer buf. Returns the number of available return addresses, which may be |
| * greater than num_entries. |
| * |
| * This function makes no guarantees about its behavior on encountering a frame built without frame |
| * pointers, except that it should not crash or enter an infinite loop, and that any frames prior to |
| * the frame built without frame pointers should be correct. |
| * |
| * This function is only meant to be used with memory safety tools such as sanitizers which need to |
| * take stack traces efficiently. Normal applications should use APIs such as libunwindstack or |
| * _Unwind_Backtrace. |
| */ |
| extern "C" size_t android_unsafe_frame_pointer_chase(uintptr_t* buf, size_t num_entries); |
