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// Copyright 2017 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COMMON_ASSERT_H_
#define COMMON_ASSERT_H_
#include "common/Compiler.h"
// Dawn asserts to be used instead of the regular C stdlib assert function (if you don't use assert
// yet, you should start now!). In debug ASSERT(condition) will trigger an error, otherwise in
// release it does nothing at runtime.
//
// In case of name clashes (with for example a testing library), you can define the
// DAWN_SKIP_ASSERT_SHORTHANDS to only define the DAWN_ prefixed macros.
//
// These asserts feature:
// - Logging of the error with file, line and function information.
// - Breaking in the debugger when an assert is triggered and a debugger is attached.
// - Use the assert information to help the compiler optimizer in release builds.
// MSVC triggers a warning in /W4 for do {} while(0). SDL worked around this by using (0,0) and
// points out that it looks like an owl face.
#if defined(DAWN_COMPILER_MSVC)
# define DAWN_ASSERT_LOOP_CONDITION (0, 0)
#else
# define DAWN_ASSERT_LOOP_CONDITION (0)
#endif
// DAWN_ASSERT_CALLSITE_HELPER generates the actual assert code. In Debug it does what you would
// expect of an assert and in release it tries to give hints to make the compiler generate better
// code.
#if defined(DAWN_ENABLE_ASSERTS)
# define DAWN_ASSERT_CALLSITE_HELPER(file, func, line, condition) \
do { \
if (!(condition)) { \
HandleAssertionFailure(file, func, line, #condition); \
} \
} while (DAWN_ASSERT_LOOP_CONDITION)
#else
# if defined(DAWN_COMPILER_MSVC)
# define DAWN_ASSERT_CALLSITE_HELPER(file, func, line, condition) __assume(condition)
# elif defined(DAWN_COMPILER_CLANG) && defined(__builtin_assume)
# define DAWN_ASSERT_CALLSITE_HELPER(file, func, line, condition) __builtin_assume(condition)
# else
# define DAWN_ASSERT_CALLSITE_HELPER(file, func, line, condition) \
do { \
DAWN_UNUSED(sizeof(condition)); \
} while (DAWN_ASSERT_LOOP_CONDITION)
# endif
#endif
#define DAWN_ASSERT(condition) DAWN_ASSERT_CALLSITE_HELPER(__FILE__, __func__, __LINE__, condition)
#define DAWN_UNREACHABLE() \
do { \
DAWN_ASSERT(DAWN_ASSERT_LOOP_CONDITION && "Unreachable code hit"); \
DAWN_BUILTIN_UNREACHABLE(); \
} while (DAWN_ASSERT_LOOP_CONDITION)
#if !defined(DAWN_SKIP_ASSERT_SHORTHANDS)
# define ASSERT DAWN_ASSERT
# define UNREACHABLE DAWN_UNREACHABLE
#endif
void HandleAssertionFailure(const char* file,
const char* function,
int line,
const char* condition);
#endif // COMMON_ASSERT_H_