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      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 
     35 typedef struct
     36 {
     37     size_t count;
     38     intptr_t* addrs;
     39 } stack_crawl_state_t;
     40 
     41 typedef struct _Unwind_Context __unwind_context;
     42 
     43 static _Unwind_Reason_Code trace_function(__unwind_context *context, void *arg)
     44 {
     45     stack_crawl_state_t* state = (stack_crawl_state_t*)arg;
     46     if (state->count) {
     47         intptr_t ip = (intptr_t)_Unwind_GetIP(context);
     48         if (ip) {
     49             state->addrs[0] = ip;
     50             state->addrs++;
     51             state->count--;
     52             return _URC_NO_REASON;
     53         }
     54     }
     55     /*
     56      * If we run out of space to record the address or 0 has been seen, stop
     57      * unwinding the stack.
     58      */
     59     return _URC_END_OF_STACK;
     60 }
     61 
     62 int heaptracker_stacktrace(intptr_t* addrs, size_t max_entries)
     63 {
     64     stack_crawl_state_t state;
     65     state.count = max_entries;
     66     state.addrs = (intptr_t*)addrs;
     67     _Unwind_Backtrace(trace_function, (void*)&state);
     68     return max_entries - state.count;
     69 }
     70