backward-cpp/test/rectrace.cpp

/*
 * test/rectrace.cpp
 * Copyright 2013 Google Inc. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "backward.hpp"
#include "test/test.hpp"
#include <stdio.h>

using namespace backward;

typedef StackTrace stacktrace_t;

void end_of_our_journey(stacktrace_t &st) {
  if (not st.size()) {
    st.load_here();
  }
}

int rec(stacktrace_t &st, int level) {
  if (level <= 1) {
    end_of_our_journey(st);
    return 0;
  }
  return rec(st, level - 1);
}

namespace toto {

namespace titi {

struct foo {

  union bar {
    __attribute__((noinline)) static int trampoline(stacktrace_t &st,
                                                    int level) {
      return rec(st, level);
    }
  };
};

} // namespace titi

} // namespace toto

TEST(recursion) {
  { // lexical scope.
    stacktrace_t st;
    const int input = 3;
    int r = toto::titi::foo::bar::trampoline(st, input);

    std::cout << "rec(" << input << ") == " << r << std::endl;

    Printer printer;
    //    printer.address = true;
    printer.object = true;
    printer.print(st, stdout);
  }
}

int fib(StackTrace &st, int level) {
  if (level == 2) {
    return 1;
  }
  if (level <= 1) {
    end_of_our_journey(st);
    return 0;
  }
  return fib(st, level - 1) + fib(st, level - 2);
}

TEST(fibrecursive) {
  StackTrace st;
  const int input = 6;
  int r = fib(st, input);

  std::cout << "fib(" << input << ") == " << r << std::endl;

  Printer printer;
  printer.print(st, stdout);
}