src/util/u_debug_stack_android.cpp

   1 /*
   2  * Copyright (C) 2018 Stefan Schake <stschake@gmail.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include <backtrace/Backtrace.h>
  25
  26 #include "util/u_debug.h"
  27 #include "u_debug_stack.h"
  28 #include "util/hash_table.h"
  29 #include "os/os_thread.h"
  30
  31 static hash_table *symbol_table;
  32 static mtx_t table_mutex = _MTX_INITIALIZER_NP;
  33
  34 static const char *
  35 intern_symbol(const char *symbol)
  36 {
  37    if (!symbol_table)
  38       symbol_table = _mesa_hash_table_create(NULL, NULL, _mesa_key_string_equal);
  39
  40    uint32_t hash = _mesa_hash_string(symbol);
  41    hash_entry *entry =
  42       _mesa_hash_table_search_pre_hashed(symbol_table, hash, symbol);
  43    if (!entry)
  44       entry = _mesa_hash_table_insert_pre_hashed(symbol_table, hash, symbol, strdup(symbol));
  45
  46    return (const char *) entry->data;
  47 }
  48
  49 void
  50 debug_backtrace_capture(debug_stack_frame *backtrace,
  51                         unsigned start_frame,
  52                         unsigned nr_frames)
  53 {
  54    Backtrace *bt;
  55
  56    if (!nr_frames)
  57       return;
  58
  59    bt = Backtrace::Create(BACKTRACE_CURRENT_PROCESS,
  60                           BACKTRACE_CURRENT_THREAD);
  61    if (bt == NULL) {
  62       for (unsigned i = 0; i < nr_frames; i++)
  63          backtrace[i].procname = NULL;
  64       return;
  65    }
  66
  67    /* Add one to exclude this call. Unwind already ignores itself. */
  68    bt->Unwind(start_frame + 1);
  69
  70    mtx_lock(&table_mutex);
  71
  72    for (unsigned i = 0; i < nr_frames; i++) {
  73       const backtrace_frame_data_t* frame = bt->GetFrame(i);
  74       if (frame) {
  75          backtrace[i].procname = intern_symbol(frame->func_name.c_str());
  76          backtrace[i].start_ip = frame->pc;
  77          backtrace[i].off = frame->func_offset;
  78          backtrace[i].map = intern_symbol(frame->map.Name().c_str());
  79          backtrace[i].map_off = frame->rel_pc;
  80       } else {
  81          backtrace[i].procname = NULL;
  82       }
  83    }
  84
  85    mtx_unlock(&table_mutex);
  86
  87    delete bt;
  88 }
  89
  90 void
  91 debug_backtrace_dump(const debug_stack_frame *backtrace,
  92                      unsigned nr_frames)
  93 {
  94    for (unsigned i = 0; i < nr_frames; i++) {
  95       if (backtrace[i].procname)
  96          debug_printf(
  97             "%s(+0x%x)\t%012" PRIx64 ": %s+0x%x\n",
  98             backtrace[i].map,
  99             backtrace[i].map_off,
 100             backtrace[i].start_ip,
 101             backtrace[i].procname,
 102             backtrace[i].off);
 103    }
 104 }
 105
 106 void
 107 debug_backtrace_print(FILE *f,
 108                       const debug_stack_frame *backtrace,
 109                       unsigned nr_frames)
 110 {
 111    for (unsigned i = 0; i < nr_frames; i++) {
 112       if (backtrace[i].procname)
 113          fprintf(f,
 114                  "%s(+0x%x)\t%012" PRIx64 ": %s+0x%x\n",
 115                  backtrace[i].map,
 116                  backtrace[i].map_off,
 117                  backtrace[i].start_ip,
 118                  backtrace[i].procname,
 119                  backtrace[i].off);
 120    }
 121 }