1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef MALLOC_DEBUG_H 30 #define MALLOC_DEBUG_H 31 32 #include <stdint.h> 33 34 #include <private/bionic_malloc_dispatch.h> 35 36 // Allocations that require a header include a variable length header. 37 // This is the order that data structures will be found. If an optional 38 // part of the header does not exist, the other parts of the header 39 // will still be in this order. 40 // Header (Required) 41 // BacktraceHeader (Optional: For the allocation backtrace) 42 // uint8_t data (Optional: Front guard, will be a multiple of MINIMUM_ALIGNMENT_BYTES) 43 // allocation data 44 // uint8_t data (Optional: End guard) 45 // 46 // If backtracing is enabled, then both BacktraceHeaders will be present. 47 // 48 // In the initialization function, offsets into the header will be set 49 // for each different header location. The offsets are always from the 50 // beginning of the Header section. 51 struct Header { 52 uint32_t tag; 53 void* orig_pointer; 54 size_t size; 55 size_t usable_size; real_sizeHeader56 size_t real_size() const { return size & ~(1U << 31); } set_zygoteHeader57 void set_zygote() { size |= 1U << 31; } max_sizeHeader58 static size_t max_size() { return (1U << 31) - 1; } 59 } __attribute__((packed)); 60 61 struct BacktraceHeader { 62 size_t num_frames; 63 uintptr_t frames[0]; 64 } __attribute__((packed)); 65 66 constexpr uint32_t DEBUG_TAG = 0x1ee7d00d; 67 constexpr uint32_t DEBUG_FREE_TAG = 0x1cc7dccd; 68 constexpr char LOG_DIVIDER[] = "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***"; 69 constexpr size_t FREE_TRACK_MEM_BUFFER_SIZE = 4096; 70 71 extern const MallocDispatch* g_dispatch; 72 73 #endif // MALLOC_DEBUG_H 74