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gecko/mfbt/tests/TestCheckedInt.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/CheckedInt.h"
#include <iostream>
#include <climits>
#ifndef MOZ_CHECKEDINT_USE_MFBT
# error "MOZ_CHECKEDINT_USE_MFBT should be defined by CheckedInt.h"
#endif
using namespace mozilla;
int gIntegerTypesTested = 0;
int gTestsPassed = 0;
int gTestsFailed = 0;
void verifyImplFunction(bool x, bool expected,
const char* file, int line,
int size, bool isTSigned)
{
if (x == expected) {
gTestsPassed++;
} else {
gTestsFailed++;
std::cerr << "Test failed at " << file << ":" << line;
std::cerr << " with T a ";
if (isTSigned)
std::cerr << "signed";
else
std::cerr << "unsigned";
std::cerr << " " << CHAR_BIT*size << "-bit integer type" << std::endl;
}
}
#define VERIFY_IMPL(x, expected) \
verifyImplFunction((x), \
(expected), \
__FILE__, \
__LINE__, \
sizeof(T), \
detail::IsSigned<T>::value)
#define VERIFY(x) VERIFY_IMPL(x, true)
#define VERIFY_IS_FALSE(x) VERIFY_IMPL(x, false)
#define VERIFY_IS_VALID(x) VERIFY_IMPL((x).isValid(), true)
#define VERIFY_IS_INVALID(x) VERIFY_IMPL((x).isValid(), false)
#define VERIFY_IS_VALID_IF(x,condition) VERIFY_IMPL((x).isValid(), (condition))
template<typename T, size_t Size = sizeof(T)>
struct testTwiceBiggerType
{
static void run()
{
VERIFY(detail::IsSupported<typename detail::TwiceBiggerType<T>::Type>::value);
VERIFY(sizeof(typename detail::TwiceBiggerType<T>::Type)
== 2 * sizeof(T));
VERIFY(bool(detail::IsSigned<typename detail::TwiceBiggerType<T>::Type>::value)
== bool(detail::IsSigned<T>::value));
}
};
template<typename T>
struct testTwiceBiggerType<T, 8>
{
static void run()
{
VERIFY_IS_FALSE(detail::IsSupported<
typename detail::TwiceBiggerType<T>::Type
>::value);
}
};
template<typename T>
void test()
{
static bool alreadyRun = false;
// Integer types from different families may just be typedefs for types from other families.
// e.g. int32_t might be just a typedef for int. No point re-running the same tests then.
if (alreadyRun)
return;
alreadyRun = true;
VERIFY(detail::IsSupported<T>::value);
const bool isTSigned = detail::IsSigned<T>::value;
VERIFY(bool(isTSigned) == !bool(T(-1) > T(0)));
testTwiceBiggerType<T>::run();
typedef typename detail::UnsignedType<T>::Type unsignedT;
VERIFY(sizeof(unsignedT) == sizeof(T));
VERIFY(detail::IsSigned<unsignedT>::value == false);
const CheckedInt<T> max(detail::MaxValue<T>::value);
const CheckedInt<T> min(detail::MinValue<T>::value);
// Check MinValue and MaxValue, since they are custom implementations and a mistake there
// could potentially NOT be caught by any other tests... while making everything wrong!
unsignedT bit = 1;
unsignedT unsignedMinValue(min.value());
unsignedT unsignedMaxValue(max.value());
for (size_t i = 0; i < sizeof(T) * CHAR_BIT - 1; i++)
{
VERIFY((unsignedMinValue & bit) == 0);
bit <<= 1;
}
VERIFY((unsignedMinValue & bit) == (isTSigned ? bit : unsignedT(0)));
VERIFY(unsignedMaxValue == unsignedT(~unsignedMinValue));
const CheckedInt<T> zero(0);
const CheckedInt<T> one(1);
const CheckedInt<T> two(2);
const CheckedInt<T> three(3);
const CheckedInt<T> four(4);
/* Addition / subtraction checks */
VERIFY_IS_VALID(zero + zero);
VERIFY(zero + zero == zero);
VERIFY_IS_FALSE(zero + zero == one); // Check that == doesn't always return true
VERIFY_IS_VALID(zero + one);
VERIFY(zero + one == one);
VERIFY_IS_VALID(one + one);
VERIFY(one + one == two);
const CheckedInt<T> maxMinusOne = max - one;
const CheckedInt<T> maxMinusTwo = max - two;
VERIFY_IS_VALID(maxMinusOne);
VERIFY_IS_VALID(maxMinusTwo);
VERIFY_IS_VALID(maxMinusOne + one);
VERIFY_IS_VALID(maxMinusTwo + one);
VERIFY_IS_VALID(maxMinusTwo + two);
VERIFY(maxMinusOne + one == max);
VERIFY(maxMinusTwo + one == maxMinusOne);
VERIFY(maxMinusTwo + two == max);
VERIFY_IS_VALID(max + zero);
VERIFY_IS_VALID(max - zero);
VERIFY_IS_INVALID(max + one);
VERIFY_IS_INVALID(max + two);
VERIFY_IS_INVALID(max + maxMinusOne);
VERIFY_IS_INVALID(max + max);
const CheckedInt<T> minPlusOne = min + one;
const CheckedInt<T> minPlusTwo = min + two;
VERIFY_IS_VALID(minPlusOne);
VERIFY_IS_VALID(minPlusTwo);
VERIFY_IS_VALID(minPlusOne - one);
VERIFY_IS_VALID(minPlusTwo - one);
VERIFY_IS_VALID(minPlusTwo - two);
VERIFY(minPlusOne - one == min);
VERIFY(minPlusTwo - one == minPlusOne);
VERIFY(minPlusTwo - two == min);
const CheckedInt<T> minMinusOne = min - one;
VERIFY_IS_VALID(min + zero);
VERIFY_IS_VALID(min - zero);
VERIFY_IS_INVALID(min - one);
VERIFY_IS_INVALID(min - two);
VERIFY_IS_INVALID(min - minMinusOne);
VERIFY_IS_VALID(min - min);
const CheckedInt<T> maxOverTwo = max / two;
VERIFY_IS_VALID(maxOverTwo + maxOverTwo);
VERIFY_IS_VALID(maxOverTwo + one);
VERIFY((maxOverTwo + one) - one == maxOverTwo);
VERIFY_IS_VALID(maxOverTwo - maxOverTwo);
VERIFY(maxOverTwo - maxOverTwo == zero);
const CheckedInt<T> minOverTwo = min / two;
VERIFY_IS_VALID(minOverTwo + minOverTwo);
VERIFY_IS_VALID(minOverTwo + one);
VERIFY((minOverTwo + one) - one == minOverTwo);
VERIFY_IS_VALID(minOverTwo - minOverTwo);
VERIFY(minOverTwo - minOverTwo == zero);
VERIFY_IS_INVALID(min - one);
VERIFY_IS_INVALID(min - two);
if (isTSigned) {
VERIFY_IS_INVALID(min + min);
VERIFY_IS_INVALID(minOverTwo + minOverTwo + minOverTwo);
VERIFY_IS_INVALID(zero - min + min);
VERIFY_IS_INVALID(one - min + min);
}
/* Unary operator- checks */
const CheckedInt<T> negOne = -one;
const CheckedInt<T> negTwo = -two;
if (isTSigned) {
VERIFY_IS_VALID(-max);
VERIFY_IS_INVALID(-min);
VERIFY(-max - min == one);
VERIFY_IS_VALID(-max - one);
VERIFY_IS_VALID(negOne);
VERIFY_IS_VALID(-max + negOne);
VERIFY_IS_VALID(negOne + one);
VERIFY(negOne + one == zero);
VERIFY_IS_VALID(negTwo);
VERIFY_IS_VALID(negOne + negOne);
VERIFY(negOne + negOne == negTwo);
} else {
VERIFY_IS_INVALID(-max);
VERIFY_IS_VALID(-min);
VERIFY(min == zero);
VERIFY_IS_INVALID(negOne);
}
/* multiplication checks */
VERIFY_IS_VALID(zero * zero);
VERIFY(zero * zero == zero);
VERIFY_IS_VALID(zero * one);
VERIFY(zero * one == zero);
VERIFY_IS_VALID(one * zero);
VERIFY(one * zero == zero);
VERIFY_IS_VALID(one * one);
VERIFY(one * one == one);
VERIFY_IS_VALID(one * three);
VERIFY(one * three == three);
VERIFY_IS_VALID(two * two);
VERIFY(two * two == four);
VERIFY_IS_INVALID(max * max);
VERIFY_IS_INVALID(maxOverTwo * max);
VERIFY_IS_INVALID(maxOverTwo * maxOverTwo);
const CheckedInt<T> maxApproxSqrt(T(T(1) << (CHAR_BIT*sizeof(T)/2)));
VERIFY_IS_VALID(maxApproxSqrt);
VERIFY_IS_VALID(maxApproxSqrt * two);
VERIFY_IS_INVALID(maxApproxSqrt * maxApproxSqrt);
VERIFY_IS_INVALID(maxApproxSqrt * maxApproxSqrt * maxApproxSqrt);
if (isTSigned) {
VERIFY_IS_INVALID(min * min);
VERIFY_IS_INVALID(minOverTwo * min);
VERIFY_IS_INVALID(minOverTwo * minOverTwo);
const CheckedInt<T> minApproxSqrt = -maxApproxSqrt;
VERIFY_IS_VALID(minApproxSqrt);
VERIFY_IS_VALID(minApproxSqrt * two);
VERIFY_IS_INVALID(minApproxSqrt * maxApproxSqrt);
VERIFY_IS_INVALID(minApproxSqrt * minApproxSqrt);
}
// make sure to check all 4 paths in signed multiplication validity check.
// test positive * positive
VERIFY_IS_VALID(max * one);
VERIFY(max * one == max);
VERIFY_IS_INVALID(max * two);
VERIFY_IS_VALID(maxOverTwo * two);
VERIFY((maxOverTwo + maxOverTwo) == (maxOverTwo * two));
if (isTSigned) {
// test positive * negative
VERIFY_IS_VALID(max * negOne);
VERIFY_IS_VALID(-max);
VERIFY(max * negOne == -max);
VERIFY_IS_VALID(one * min);
VERIFY_IS_INVALID(max * negTwo);
VERIFY_IS_VALID(maxOverTwo * negTwo);
VERIFY_IS_VALID(two * minOverTwo);
VERIFY_IS_VALID((maxOverTwo + one) * negTwo);
VERIFY_IS_INVALID((maxOverTwo + two) * negTwo);
VERIFY_IS_INVALID(two * (minOverTwo - one));
// test negative * positive
VERIFY_IS_VALID(min * one);
VERIFY_IS_VALID(minPlusOne * one);
VERIFY_IS_INVALID(min * two);
VERIFY_IS_VALID(minOverTwo * two);
VERIFY(minOverTwo * two == min);
VERIFY_IS_INVALID((minOverTwo - one) * negTwo);
VERIFY_IS_INVALID(negTwo * max);
VERIFY_IS_VALID(minOverTwo * two);
VERIFY(minOverTwo * two == min);
VERIFY_IS_VALID(negTwo * maxOverTwo);
VERIFY_IS_INVALID((minOverTwo - one) * two);
VERIFY_IS_VALID(negTwo * (maxOverTwo + one));
VERIFY_IS_INVALID(negTwo * (maxOverTwo + two));
// test negative * negative
VERIFY_IS_INVALID(min * negOne);
VERIFY_IS_VALID(minPlusOne * negOne);
VERIFY(minPlusOne * negOne == max);
VERIFY_IS_INVALID(min * negTwo);
VERIFY_IS_INVALID(minOverTwo * negTwo);
VERIFY_IS_INVALID(negOne * min);
VERIFY_IS_VALID(negOne * minPlusOne);
VERIFY(negOne * minPlusOne == max);
VERIFY_IS_INVALID(negTwo * min);
VERIFY_IS_INVALID(negTwo * minOverTwo);
}
/* Division checks */
VERIFY_IS_VALID(one / one);
VERIFY(one / one == one);
VERIFY_IS_VALID(three / three);
VERIFY(three / three == one);
VERIFY_IS_VALID(four / two);
VERIFY(four / two == two);
VERIFY((four*three)/four == three);
// Check that div by zero is invalid
VERIFY_IS_INVALID(zero / zero);
VERIFY_IS_INVALID(one / zero);
VERIFY_IS_INVALID(two / zero);
VERIFY_IS_INVALID(negOne / zero);
VERIFY_IS_INVALID(max / zero);
VERIFY_IS_INVALID(min / zero);
if (isTSigned) {
// Check that min / -1 is invalid
VERIFY_IS_INVALID(min / negOne);
// Check that the test for div by -1 isn't banning other numerators than min
VERIFY_IS_VALID(one / negOne);
VERIFY_IS_VALID(zero / negOne);
VERIFY_IS_VALID(negOne / negOne);
VERIFY_IS_VALID(max / negOne);
}
/* Check that invalidity is correctly preserved by arithmetic ops */
const CheckedInt<T> someInvalid = max + max;
VERIFY_IS_INVALID(someInvalid + zero);
VERIFY_IS_INVALID(someInvalid - zero);
VERIFY_IS_INVALID(zero + someInvalid);
VERIFY_IS_INVALID(zero - someInvalid);
VERIFY_IS_INVALID(-someInvalid);
VERIFY_IS_INVALID(someInvalid * zero);
VERIFY_IS_INVALID(someInvalid * one);
VERIFY_IS_INVALID(zero * someInvalid);
VERIFY_IS_INVALID(one * someInvalid);
VERIFY_IS_INVALID(someInvalid / zero);
VERIFY_IS_INVALID(someInvalid / one);
VERIFY_IS_INVALID(zero / someInvalid);
VERIFY_IS_INVALID(one / someInvalid);
VERIFY_IS_INVALID(someInvalid + someInvalid);
VERIFY_IS_INVALID(someInvalid - someInvalid);
VERIFY_IS_INVALID(someInvalid * someInvalid);
VERIFY_IS_INVALID(someInvalid / someInvalid);
/* Check that mixing checked integers with plain integers in expressions is allowed */
VERIFY(one + T(2) == three);
VERIFY(2 + one == three);
{
CheckedInt<T> x = one;
x += 2;
VERIFY(x == three);
}
VERIFY(two - 1 == one);
VERIFY(2 - one == one);
{
CheckedInt<T> x = two;
x -= 1;
VERIFY(x == one);
}
VERIFY(one * 2 == two);
VERIFY(2 * one == two);
{
CheckedInt<T> x = one;
x *= 2;
VERIFY(x == two);
}
VERIFY(four / 2 == two);
VERIFY(4 / two == two);
{
CheckedInt<T> x = four;
x /= 2;
VERIFY(x == two);
}
VERIFY(one == 1);
VERIFY(1 == one);
VERIFY_IS_FALSE(two == 1);
VERIFY_IS_FALSE(1 == two);
VERIFY_IS_FALSE(someInvalid == 1);
VERIFY_IS_FALSE(1 == someInvalid);
/* Check that construction of CheckedInt from an integer value of a mismatched type is checked */
#define VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(U) \
{ \
bool isUSigned = detail::IsSigned<U>::value; \
VERIFY_IS_VALID(CheckedInt<T>(U(0))); \
VERIFY_IS_VALID(CheckedInt<T>(U(1))); \
VERIFY_IS_VALID(CheckedInt<T>(U(100))); \
if (isUSigned) \
VERIFY_IS_VALID_IF(CheckedInt<T>(U(-1)), isTSigned); \
if (sizeof(U) > sizeof(T)) \
VERIFY_IS_INVALID(CheckedInt<T>(U(detail::MaxValue<T>::value) + one.value())); \
VERIFY_IS_VALID_IF(CheckedInt<T>(detail::MaxValue<U>::value), \
(sizeof(T) > sizeof(U) || ((sizeof(T) == sizeof(U)) && (isUSigned || !isTSigned)))); \
VERIFY_IS_VALID_IF(CheckedInt<T>(detail::MinValue<U>::value), \
isUSigned == false ? 1 : \
bool(isTSigned) == false ? 0 : \
sizeof(T) >= sizeof(U)); \
}
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(int8_t)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(uint8_t)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(int16_t)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(uint16_t)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(int32_t)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(uint32_t)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(int64_t)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(uint64_t)
typedef signed char signedChar;
typedef unsigned char unsignedChar;
typedef unsigned short unsignedShort;
typedef unsigned int unsignedInt;
typedef unsigned long unsignedLong;
typedef long long longLong;
typedef unsigned long long unsignedLongLong;
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(char)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(signedChar)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(unsignedChar)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(short)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(unsignedShort)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(int)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(unsignedInt)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(long)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(unsignedLong)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(longLong)
VERIFY_CONSTRUCTION_FROM_INTEGER_TYPE(unsignedLongLong)
/* Test increment/decrement operators */
CheckedInt<T> x, y;
x = one;
y = x++;
VERIFY(x == two);
VERIFY(y == one);
x = one;
y = ++x;
VERIFY(x == two);
VERIFY(y == two);
x = one;
y = x--;
VERIFY(x == zero);
VERIFY(y == one);
x = one;
y = --x;
VERIFY(x == zero);
VERIFY(y == zero);
x = max;
VERIFY_IS_VALID(x++);
x = max;
VERIFY_IS_INVALID(++x);
x = min;
VERIFY_IS_VALID(x--);
x = min;
VERIFY_IS_INVALID(--x);
gIntegerTypesTested++;
}
int main()
{
test<int8_t>();
test<uint8_t>();
test<int16_t>();
test<uint16_t>();
test<int32_t>();
test<uint32_t>();
test<int64_t>();
test<uint64_t>();
test<char>();
test<signed char>();
test<unsigned char>();
test<short>();
test<unsigned short>();
test<int>();
test<unsigned int>();
test<long>();
test<unsigned long>();
test<long long>();
test<unsigned long long>();
const int MIN_TYPES_TESTED = 9;
if (gIntegerTypesTested < MIN_TYPES_TESTED) {
std::cerr << "Only " << gIntegerTypesTested << " have been tested. "
<< "This should not be less than " << MIN_TYPES_TESTED << "."
<< std::endl;
gTestsFailed++;
}
std::cerr << gTestsFailed << " tests failed, "
<< gTestsPassed << " tests passed out of "
<< gTestsFailed + gTestsPassed
<< " tests, covering " << gIntegerTypesTested
<< " distinct integer types." << std::endl;
return gTestsFailed > 0;
}
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