From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 mfbt/tests/TestCasting.cpp | 255 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 255 insertions(+)
 create mode 100644 mfbt/tests/TestCasting.cpp

(limited to 'mfbt/tests/TestCasting.cpp')

diff --git a/mfbt/tests/TestCasting.cpp b/mfbt/tests/TestCasting.cpp
new file mode 100644
index 0000000000..9b040956c7
--- /dev/null
+++ b/mfbt/tests/TestCasting.cpp
@@ -0,0 +1,255 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/Casting.h"
+#include "mozilla/ThreadSafety.h"
+
+#include <stdint.h>
+#include <cstdint>
+#include <limits>
+#include <type_traits>
+
+using mozilla::AssertedCast;
+using mozilla::BitwiseCast;
+using mozilla::detail::IsInBounds;
+
+static const uint8_t floatMantissaBitsPlusOne = 24;
+static const uint8_t doubleMantissaBitsPlusOne = 53;
+
+template <typename Uint, typename Ulong, bool = (sizeof(Uint) == sizeof(Ulong))>
+struct UintUlongBitwiseCast;
+
+template <typename Uint, typename Ulong>
+struct UintUlongBitwiseCast<Uint, Ulong, true> {
+  static void test() {
+    MOZ_RELEASE_ASSERT(BitwiseCast<Ulong>(Uint(8675309)) == Ulong(8675309));
+  }
+};
+
+template <typename Uint, typename Ulong>
+struct UintUlongBitwiseCast<Uint, Ulong, false> {
+  static void test() {}
+};
+
+static void TestBitwiseCast() {
+  MOZ_RELEASE_ASSERT(BitwiseCast<int>(int(8675309)) == int(8675309));
+  UintUlongBitwiseCast<unsigned int, unsigned long>::test();
+}
+
+static void TestSameSize() {
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int16_t>(int16_t(0))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int16_t>(int16_t(INT16_MIN))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int16_t>(int16_t(INT16_MAX))));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, uint16_t>(uint16_t(UINT16_MAX))));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, int16_t>(uint16_t(0))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<uint16_t, int16_t>(uint16_t(-1))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint16_t>(int16_t(-1))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, uint16_t>(int16_t(INT16_MAX))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint16_t>(int16_t(INT16_MIN))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int32_t, uint32_t>(int32_t(INT32_MAX))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, uint32_t>(int32_t(INT32_MIN))));
+}
+
+static void TestToBiggerSize() {
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int32_t>(int16_t(0))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int32_t>(int16_t(INT16_MIN))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int32_t>(int16_t(INT16_MAX))));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, uint32_t>(uint16_t(UINT16_MAX))));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, int32_t>(uint16_t(0))));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, int32_t>(uint16_t(-1))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint32_t>(int16_t(-1))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, uint32_t>(int16_t(INT16_MAX))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint32_t>(int16_t(INT16_MIN))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int32_t, uint64_t>(int32_t(INT32_MAX))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, uint64_t>(int32_t(INT32_MIN))));
+}
+
+static void TestToSmallerSize() {
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, int8_t>(int16_t(0))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, int8_t>(int16_t(INT16_MIN))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, int8_t>(int16_t(INT16_MAX))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<uint16_t, uint8_t>(uint16_t(UINT16_MAX))));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, int8_t>(uint16_t(0))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<uint16_t, int8_t>(uint16_t(-1))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint8_t>(int16_t(-1))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint8_t>(int16_t(INT16_MAX))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int16_t, uint8_t>(int16_t(INT16_MIN))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, uint16_t>(int32_t(INT32_MAX))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, uint16_t>(int32_t(INT32_MIN))));
+
+  // Boundary cases
+  MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, int32_t>(int64_t(INT32_MIN) - 1)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, int32_t>(int64_t(INT32_MIN))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, int32_t>(int64_t(INT32_MIN) + 1)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, int32_t>(int64_t(INT32_MAX) - 1)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, int32_t>(int64_t(INT32_MAX))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, int32_t>(int64_t(INT32_MAX) + 1)));
+
+  MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, uint32_t>(int64_t(-1))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, uint32_t>(int64_t(0))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, uint32_t>(int64_t(1))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, uint32_t>(int64_t(UINT32_MAX) - 1)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, uint32_t>(int64_t(UINT32_MAX))));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, uint32_t>(int64_t(UINT32_MAX) + 1)));
+}
+
+template <typename In, typename Out>
+void checkBoundariesFloating(In aEpsilon = {}, Out aIntegerOffset = {}) {
+  // Check the max value of the input float can't be represented as an integer.
+  // This is true for all floating point and integer width.
+  MOZ_RELEASE_ASSERT((!IsInBounds<In, Out>(std::numeric_limits<In>::max())));
+  // Check that the max value of the integer, as a float, minus an offset that
+  // depends on the magnitude, can be represented as an integer.
+  MOZ_RELEASE_ASSERT((IsInBounds<In, Out>(
+      static_cast<In>(std::numeric_limits<Out>::max() - aIntegerOffset))));
+  // Check that the max value of the integer, plus a number that depends on the
+  // magnitude of the number, can't be represented as this integer (because it
+  // becomes too big).
+  MOZ_RELEASE_ASSERT((!IsInBounds<In, Out>(
+      aEpsilon + static_cast<In>(std::numeric_limits<Out>::max()))));
+  if constexpr (std::is_signed_v<In>) {
+    // Same for negative numbers.
+    MOZ_RELEASE_ASSERT(
+        (!IsInBounds<In, Out>(std::numeric_limits<In>::lowest())));
+    MOZ_RELEASE_ASSERT((IsInBounds<In, Out>(
+        static_cast<In>(std::numeric_limits<Out>::lowest()))));
+    MOZ_RELEASE_ASSERT((!IsInBounds<In, Out>(
+        static_cast<In>(std::numeric_limits<Out>::lowest()) - aEpsilon)));
+  } else {
+    // Check for negative floats and unsigned integer types.
+    MOZ_RELEASE_ASSERT((!IsInBounds<In, Out>(static_cast<In>(-1))));
+  }
+}
+
+void TestFloatConversion() {
+  MOZ_RELEASE_ASSERT((!IsInBounds<uint64_t, float>(UINT64_MAX)));
+  MOZ_RELEASE_ASSERT((!IsInBounds<uint32_t, float>(UINT32_MAX)));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, float>(UINT16_MAX)));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint8_t, float>(UINT8_MAX)));
+
+  MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, float>(INT64_MAX)));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, float>(INT64_MIN)));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, float>(INT32_MAX)));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int32_t, float>(INT32_MIN)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, float>(INT16_MAX)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, float>(INT16_MIN)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int8_t, float>(INT8_MAX)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int8_t, float>(INT8_MIN)));
+
+  MOZ_RELEASE_ASSERT((!IsInBounds<uint64_t, double>(UINT64_MAX)));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint32_t, double>(UINT32_MAX)));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint16_t, double>(UINT16_MAX)));
+  MOZ_RELEASE_ASSERT((IsInBounds<uint8_t, double>(UINT8_MAX)));
+
+  MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, double>(INT64_MAX)));
+  MOZ_RELEASE_ASSERT((!IsInBounds<int64_t, double>(INT64_MIN)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int32_t, double>(INT32_MAX)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int32_t, double>(INT32_MIN)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, double>(INT16_MAX)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int16_t, double>(INT16_MIN)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int8_t, double>(INT8_MAX)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int8_t, double>(INT8_MIN)));
+
+  // Floor check
+  MOZ_RELEASE_ASSERT((IsInBounds<float, uint64_t>(4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<uint64_t>(4.3f) == 4u));
+  MOZ_RELEASE_ASSERT((IsInBounds<float, uint32_t>(4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<uint32_t>(4.3f) == 4u));
+  MOZ_RELEASE_ASSERT((IsInBounds<float, uint16_t>(4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<uint16_t>(4.3f) == 4u));
+  MOZ_RELEASE_ASSERT((IsInBounds<float, uint8_t>(4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<uint8_t>(4.3f) == 4u));
+
+  MOZ_RELEASE_ASSERT((IsInBounds<float, int64_t>(4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<int64_t>(4.3f) == 4u));
+  MOZ_RELEASE_ASSERT((IsInBounds<float, int32_t>(4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<int32_t>(4.3f) == 4u));
+  MOZ_RELEASE_ASSERT((IsInBounds<float, int16_t>(4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<int16_t>(4.3f) == 4u));
+  MOZ_RELEASE_ASSERT((IsInBounds<float, int8_t>(4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<int8_t>(4.3f) == 4u));
+
+  MOZ_RELEASE_ASSERT((IsInBounds<float, int64_t>(-4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<int64_t>(-4.3f) == -4));
+  MOZ_RELEASE_ASSERT((IsInBounds<float, int32_t>(-4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<int32_t>(-4.3f) == -4));
+  MOZ_RELEASE_ASSERT((IsInBounds<float, int16_t>(-4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<int16_t>(-4.3f) == -4));
+  MOZ_RELEASE_ASSERT((IsInBounds<float, int8_t>(-4.3)));
+  MOZ_RELEASE_ASSERT((AssertedCast<int8_t>(-4.3f) == -4));
+
+  // Bound check for float to unsigned integer conversion. The parameters are
+  // espilons and offsets allowing to check boundaries, that depend on the
+  // magnitude of the numbers.
+  checkBoundariesFloating<double, uint64_t>(2049.);
+  checkBoundariesFloating<double, uint32_t>(1.);
+  checkBoundariesFloating<double, uint16_t>(1.);
+  checkBoundariesFloating<double, uint8_t>(1.);
+  // Large number because of the lack of precision of floats at this magnitude
+  checkBoundariesFloating<float, uint64_t>(1.1e12f);
+  checkBoundariesFloating<float, uint32_t>(1.f, 128u);
+  checkBoundariesFloating<float, uint16_t>(1.f);
+  checkBoundariesFloating<float, uint8_t>(1.f);
+
+  checkBoundariesFloating<double, int64_t>(1025.);
+  checkBoundariesFloating<double, int32_t>(1.);
+  checkBoundariesFloating<double, int16_t>(1.);
+  checkBoundariesFloating<double, int8_t>(1.);
+  // Large number because of the lack of precision of floats at this magnitude
+  checkBoundariesFloating<float, int64_t>(1.1e12f);
+  checkBoundariesFloating<float, int32_t>(256.f, 64u);
+  checkBoundariesFloating<float, int16_t>(1.f);
+  checkBoundariesFloating<float, int8_t>(1.f);
+
+  // Integer to floating point, boundary cases
+  MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, float>(
+      int64_t(std::pow(2, floatMantissaBitsPlusOne)) + 1)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, float>(
+      int64_t(std::pow(2, floatMantissaBitsPlusOne)))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, float>(
+      int64_t(std::pow(2, floatMantissaBitsPlusOne)) - 1)));
+
+  MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, float>(
+      int64_t(-std::pow(2, floatMantissaBitsPlusOne)) - 1)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, float>(
+      int64_t(-std::pow(2, floatMantissaBitsPlusOne)))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, float>(
+      int64_t(-std::pow(2, floatMantissaBitsPlusOne)) + 1)));
+
+  MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, double>(
+      uint64_t(std::pow(2, doubleMantissaBitsPlusOne)) + 1)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, double>(
+      uint64_t(std::pow(2, doubleMantissaBitsPlusOne)))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, double>(
+      uint64_t(std::pow(2, doubleMantissaBitsPlusOne)) - 1)));
+
+  MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, double>(
+      int64_t(-std::pow(2, doubleMantissaBitsPlusOne)) - 1)));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, double>(
+      int64_t(-std::pow(2, doubleMantissaBitsPlusOne)))));
+  MOZ_RELEASE_ASSERT((IsInBounds<int64_t, double>(
+      int64_t(-std::pow(2, doubleMantissaBitsPlusOne)) + 1)));
+
+  MOZ_RELEASE_ASSERT(!(IsInBounds<uint64_t, double>(UINT64_MAX)));
+  MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, double>(INT64_MAX)));
+  MOZ_RELEASE_ASSERT(!(IsInBounds<int64_t, double>(INT64_MIN)));
+
+  MOZ_RELEASE_ASSERT(
+      !(IsInBounds<double, float>(std::numeric_limits<double>::max())));
+  MOZ_RELEASE_ASSERT(
+      !(IsInBounds<double, float>(-std::numeric_limits<double>::max())));
+}
+
+int main() {
+  TestBitwiseCast();
+
+  TestSameSize();
+  TestToBiggerSize();
+  TestToSmallerSize();
+  TestFloatConversion();
+
+  return 0;
+}
-- 
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