137 lines
4.1 KiB
C++
137 lines
4.1 KiB
C++
// Copyright (c) 2012-2014 The Bitcoin Core developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "bignum.h"
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#include <limits>
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#include <stdint.h>
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#include <boost/test/unit_test.hpp>
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BOOST_AUTO_TEST_SUITE(bignum_tests)
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// Unfortunately there's no standard way of preventing a function from being
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// inlined, so we define a macro for it.
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//
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// You should use it like this:
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// NOINLINE void function() {...}
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#if defined(__GNUC__)
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// This also works and will be defined for any compiler implementing GCC
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// extensions, such as Clang and ICC.
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#define NOINLINE __attribute__((noinline))
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#elif defined(_MSC_VER)
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#define NOINLINE __declspec(noinline)
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#else
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// We give out a warning because it impacts the correctness of one bignum test.
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#warning You should define NOINLINE for your compiler.
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#define NOINLINE
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#endif
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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's undefined behaviour checker.
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// See also: http://clang.llvm.org/docs/UsersManual.html#controlling-code-generation
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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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NOINLINE void mysetint64(CBigNum& num, int64_t 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_t 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 = std::numeric_limits<int64_t>::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 = std::numeric_limits<int64_t>::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_CASE(bignum_SetHex)
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{
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std::string hexStr = "deecf97fd890808b9cc0f1b6a3e7a60b400f52710e6ad075b1340755bfa58cc9";
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CBigNum num;
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num.SetHex(hexStr);
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BOOST_CHECK_EQUAL(num.GetHex(), hexStr);
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}
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BOOST_AUTO_TEST_SUITE_END()
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