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One of the test cases currently aborts when using gcc's flag -ftrapv, due to negating an INT64_MIN int64 variable, which is an undefined operation. This will be fixed in a subsequent commit.0.8
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#include <boost/test/unit_test.hpp> |
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#include <climits> |
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#include "bignum.h" |
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BOOST_AUTO_TEST_SUITE(bignum_tests) |
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// For the following test case, it is useful to use additional tools.
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//
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// The simplest one to use is the compiler flag -ftrapv, which detects integer
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// overflows and similar errors. However, due to optimizations and compilers
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// taking advantage of undefined behavior sometimes it may not actually detect
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// anything.
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//
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// You can also use compiler-based stack protection to possibly detect possible
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// stack buffer overruns.
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//
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// For more accurate diagnostics, you can use an undefined arithmetic operation
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// detector such as the clang-based tool:
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//
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// "IOC: An Integer Overflow Checker for C/C++"
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//
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// Available at: http://embed.cs.utah.edu/ioc/
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//
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// It might also be useful to use Google's AddressSanitizer to detect
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// stack buffer overruns, which valgrind can't currently detect.
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// Let's force this code not to be inlined, in order to actually
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// test a generic version of the function. This increases the chance
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// that -ftrapv will detect overflows.
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void mysetint64(CBigNum& num, int64 n) __attribute__((noinline)); |
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void mysetint64(CBigNum& num, int64 n) |
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{ |
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num.setint64(n); |
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} |
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// For each number, we do 2 tests: one with inline code, then we reset the
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// value to 0, then the second one with a non-inlined function.
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BOOST_AUTO_TEST_CASE(bignum_setint64) |
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{ |
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int64 n; |
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{ |
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n = 0; |
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CBigNum num(n); |
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BOOST_CHECK(num.ToString() == "0"); |
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num.setulong(0); |
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BOOST_CHECK(num.ToString() == "0"); |
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mysetint64(num, n); |
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BOOST_CHECK(num.ToString() == "0"); |
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} |
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{ |
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n = 1; |
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CBigNum num(n); |
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BOOST_CHECK(num.ToString() == "1"); |
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num.setulong(0); |
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BOOST_CHECK(num.ToString() == "0"); |
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mysetint64(num, n); |
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BOOST_CHECK(num.ToString() == "1"); |
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} |
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{ |
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n = -1; |
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CBigNum num(n); |
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BOOST_CHECK(num.ToString() == "-1"); |
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num.setulong(0); |
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BOOST_CHECK(num.ToString() == "0"); |
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mysetint64(num, n); |
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BOOST_CHECK(num.ToString() == "-1"); |
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} |
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{ |
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n = 5; |
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CBigNum num(n); |
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BOOST_CHECK(num.ToString() == "5"); |
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num.setulong(0); |
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BOOST_CHECK(num.ToString() == "0"); |
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mysetint64(num, n); |
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BOOST_CHECK(num.ToString() == "5"); |
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} |
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{ |
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n = -5; |
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CBigNum num(n); |
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BOOST_CHECK(num.ToString() == "-5"); |
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num.setulong(0); |
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BOOST_CHECK(num.ToString() == "0"); |
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mysetint64(num, n); |
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BOOST_CHECK(num.ToString() == "-5"); |
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} |
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{ |
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n = LLONG_MIN; |
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CBigNum num(n); |
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BOOST_CHECK(num.ToString() == "-9223372036854775808"); |
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num.setulong(0); |
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BOOST_CHECK(num.ToString() == "0"); |
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mysetint64(num, n); |
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BOOST_CHECK(num.ToString() == "-9223372036854775808"); |
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} |
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{ |
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n = LLONG_MAX; |
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CBigNum num(n); |
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BOOST_CHECK(num.ToString() == "9223372036854775807"); |
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num.setulong(0); |
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BOOST_CHECK(num.ToString() == "0"); |
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mysetint64(num, n); |
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BOOST_CHECK(num.ToString() == "9223372036854775807"); |
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} |
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} |
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BOOST_AUTO_TEST_SUITE_END() |
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