libbacktrace/backtrace_testlib.cpp

/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <libunwind.h>
#include <signal.h>
#include <stdio.h>

#include "backtrace_testlib.h"

void test_loop_forever() {
  while (1)
    ;
}

void test_signal_handler(int) { test_loop_forever(); }

void test_signal_action(int, siginfo_t*, void*) { test_loop_forever(); }

int test_level_four(int one, int two, int three, int four, void (*callback_func)(void*),
                    void* data) {
  if (callback_func != NULL) {
    callback_func(data);
  } else {
    while (1)
      ;
  }
  return one + two + three + four;
}

int test_level_three(int one, int two, int three, int four, void (*callback_func)(void*),
                     void* data) {
  return test_level_four(one + 3, two + 6, three + 9, four + 12, callback_func, data) + 3;
}

int test_level_two(int one, int two, int three, int four, void (*callback_func)(void*), void* data) {
  return test_level_three(one + 2, two + 4, three + 6, four + 8, callback_func, data) + 2;
}

int test_level_one(int one, int two, int three, int four, void (*callback_func)(void*), void* data) {
  return test_level_two(one + 1, two + 2, three + 3, four + 4, callback_func, data) + 1;
}

int test_recursive_call(int level, void (*callback_func)(void*), void* data) {
  if (level > 0) {
    return test_recursive_call(level - 1, callback_func, data) + level;
  } else if (callback_func != NULL) {
    callback_func(data);
  } else {
    while (1) {
    }
  }
  return 0;
}

typedef struct {
  unw_context_t* unw_context;
  volatile int* exit_flag;
} GetContextArg;

static void GetContextAndExit(void* data) {
  GetContextArg* arg = (GetContextArg*)data;
  unw_getcontext(arg->unw_context);
  // Don't touch the stack anymore.
  while (*arg->exit_flag == 0) {
  }
}

void test_get_context_and_wait(unw_context_t* unw_context, volatile int* exit_flag) {
  GetContextArg arg;
  arg.unw_context = unw_context;
  arg.exit_flag = exit_flag;
  test_level_one(1, 2, 3, 4, GetContextAndExit, &arg);
}