Line data    Source code

       1             : // Copyright (c) 2019-2020 The Bitcoin Core developers
       2             : // Distributed under the MIT software license, see the accompanying
       3             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4             : 
       5             : #include <boost/test/unit_test.hpp>
       6             : #include <test/util/setup_common.h>
       7             : 
       8          89 : BOOST_FIXTURE_TEST_SUITE(compilerbug_tests, BasicTestingSetup)
       9             : 
      10             : #if defined(__GNUC__)
      11             : // This block will also be built under clang, which is fine (as it supports noinline)
      12          10 : void __attribute__ ((noinline)) set_one(unsigned char* ptr)
      13             : {
      14          10 :     *ptr = 1;
      15          10 : }
      16             : 
      17           5 : int __attribute__ ((noinline)) check_zero(unsigned char const* in, unsigned int len)
      18             : {
      19          15 :     for (unsigned int i = 0; i < len; ++i) {
      20          10 :         if (in[i] != 0) return 0;
      21             :     }
      22           5 :     return 1;
      23           5 : }
      24             : 
      25          10 : void set_one_on_stack() {
      26          10 :     unsigned char buf[1];
      27          10 :     set_one(buf);
      28          10 : }
      29             : 
      30          95 : BOOST_AUTO_TEST_CASE(gccbug_90348) {
      31             :     // Test for GCC bug 90348. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90348
      32           6 :     for (int i = 0; i <= 4; ++i) {
      33           5 :         unsigned char in[4];
      34          15 :         for (int j = 0; j < i; ++j) {
      35          10 :             in[j] = 0;
      36          10 :             set_one_on_stack(); // Apparently modifies in[0]
      37             :         }
      38           5 :         BOOST_CHECK(check_zero(in, i));
      39           5 :     }
      40           1 : }
      41             : #endif
      42             : 
      43          89 : BOOST_AUTO_TEST_SUITE_END()