1/*
2 * Copyright (C) 2008 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#include <unwind.h>
29#include <sys/types.h>
30
31// =============================================================================
32// stack trace functions
33// =============================================================================
34
35typedef struct
36{
37    size_t count;
38    intptr_t* addrs;
39} stack_crawl_state_t;
40
41
42/* depends how the system includes define this */
43#ifdef HAVE_UNWIND_CONTEXT_STRUCT
44typedef struct _Unwind_Context __unwind_context;
45#else
46typedef _Unwind_Context __unwind_context;
47#endif
48
49static _Unwind_Reason_Code trace_function(__unwind_context *context, void *arg)
50{
51    stack_crawl_state_t* state = (stack_crawl_state_t*)arg;
52    if (state->count) {
53        intptr_t ip = (intptr_t)_Unwind_GetIP(context);
54        if (ip) {
55            state->addrs[0] = ip;
56            state->addrs++;
57            state->count--;
58            return _URC_NO_REASON;
59        }
60    }
61    /*
62     * If we run out of space to record the address or 0 has been seen, stop
63     * unwinding the stack.
64     */
65    return _URC_END_OF_STACK;
66}
67
68int heaptracker_stacktrace(intptr_t* addrs, size_t max_entries)
69{
70    stack_crawl_state_t state;
71    state.count = max_entries;
72    state.addrs = (intptr_t*)addrs;
73    _Unwind_Backtrace(trace_function, (void*)&state);
74    return max_entries - state.count;
75}
76