// 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 SRC_DAWN_COMMON_PLATFORM_H_
#define SRC_DAWN_COMMON_PLATFORM_H_

#if defined(_WIN32) || defined(_WIN64)
#include <winapifamily.h>
#define DAWN_PLATFORM_IS_WINDOWS 1
#if WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP
#define DAWN_PLATFORM_IS_WIN32 1
#elif WINAPI_FAMILY == WINAPI_FAMILY_PC_APP
#define DAWN_PLATFORM_IS_WINUWP 1
#else
#error "Unsupported Windows platform."
#endif

#elif defined(__linux__)
#define DAWN_PLATFORM_IS_LINUX 1
#define DAWN_PLATFORM_IS_POSIX 1
#if defined(__ANDROID__)
#define DAWN_PLATFORM_IS_ANDROID 1
#endif

#elif defined(__APPLE__)
#define DAWN_PLATFORM_IS_APPLE 1
#define DAWN_PLATFORM_IS_POSIX 1
#include <TargetConditionals.h>
#if TARGET_OS_IPHONE
#define DAWN_PLATFORM_IS_IOS 1
#elif TARGET_OS_MAC
#define DAWN_PLATFORM_IS_MACOS 1
#else
#error "Unsupported Apple platform."
#endif

#elif defined(__Fuchsia__)
#define DAWN_PLATFORM_IS_FUCHSIA 1
#define DAWN_PLATFORM_IS_POSIX 1

#elif defined(__EMSCRIPTEN__)
#define DAWN_PLATFORM_IS_EMSCRIPTEN 1
#define DAWN_PLATFORM_IS_POSIX 1

#else
#error "Unsupported platform."
#endif

// Distinguish mips32.
#if defined(__mips__) && (_MIPS_SIM == _ABIO32) && !defined(__mips32__)
#define __mips32__
#endif

// Distinguish mips64.
#if defined(__mips__) && (_MIPS_SIM == _ABI64) && !defined(__mips64__)
#define __mips64__
#endif

#if defined(_WIN64) || defined(__aarch64__) || defined(__x86_64__) || defined(__mips64__) || \
    defined(__s390x__) || defined(__PPC64__)
#define DAWN_PLATFORM_IS_64_BIT 1
static_assert(sizeof(sizeof(char)) == 8, "Expect sizeof(size_t) == 8");
#elif defined(_WIN32) || defined(__arm__) || defined(__i386__) || defined(__mips32__) || \
    defined(__s390__) || defined(__EMSCRIPTEN__)
#define DAWN_PLATFORM_IS_32_BIT 1
static_assert(sizeof(sizeof(char)) == 4, "Expect sizeof(size_t) == 4");
#else
#error "Unsupported platform"
#endif

// This section define other platform macros to 0 to avoid undefined macro usage error.
#if !defined(DAWN_PLATFORM_IS_WINDOWS)
#define DAWN_PLATFORM_IS_WINDOWS 0
#endif
#if !defined(DAWN_PLATFORM_IS_WIN32)
#define DAWN_PLATFORM_IS_WIN32 0
#endif
#if !defined(DAWN_PLATFORM_IS_WINUWP)
#define DAWN_PLATFORM_IS_WINUWP 0
#endif

#if !defined(DAWN_PLATFORM_IS_POSIX)
#define DAWN_PLATFORM_IS_POSIX 0
#endif

#if !defined(DAWN_PLATFORM_IS_LINUX)
#define DAWN_PLATFORM_IS_LINUX 0
#endif
#if !defined(DAWN_PLATFORM_IS_ANDROID)
#define DAWN_PLATFORM_IS_ANDROID 0
#endif

#if !defined(DAWN_PLATFORM_IS_APPLE)
#define DAWN_PLATFORM_IS_APPLE 0
#endif
#if !defined(DAWN_PLATFORM_IS_IOS)
#define DAWN_PLATFORM_IS_IOS 0
#endif
#if !defined(DAWN_PLATFORM_IS_MACOS)
#define DAWN_PLATFORM_IS_MACOS 0
#endif

#if !defined(DAWN_PLATFORM_IS_FUCHSIA)
#define DAWN_PLATFORM_IS_FUCHSIA 0
#endif
#if !defined(DAWN_PLATFORM_IS_EMSCRIPTEN)
#define DAWN_PLATFORM_IS_EMSCRIPTEN 0
#endif

#if !defined(DAWN_PLATFORM_IS_64_BIT)
#define DAWN_PLATFORM_IS_64_BIT 0
#endif
#if !defined(DAWN_PLATFORM_IS_32_BIT)
#define DAWN_PLATFORM_IS_32_BIT 0
#endif

// Use #if DAWN_PLATFORM_IS(XXX) for platform specific code.
// Do not use #ifdef or the naked macro DAWN_PLATFORM_IS_XXX.
// This can help avoid common mistakes like not including "Platform.h" and falling into unwanted
// code block as usage of undefined macro "function" will be blocked by the compiler.
#define DAWN_PLATFORM_IS(X) (1 == DAWN_PLATFORM_IS_##X)

#endif  // SRC_DAWN_COMMON_PLATFORM_H_