mirror of
https://github.com/encounter/dawn-cmake.git
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445869d2b0
This is fixes the soon to be added -Wc++98-compat-extra-semi wraning. TBR=kainino@chromium.org BUG= Change-Id: I26abb54c821a9ad0893af37b626c44d8271c216c Reviewed-on: https://dawn-review.googlesource.com/c/4661 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Corentin Wallez <cwallez@chromium.org>
102 lines
3.8 KiB
C++
102 lines
3.8 KiB
C++
// Copyright 2017 The Dawn Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef COMMON_COMPILER_H_
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#define COMMON_COMPILER_H_
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// Defines macros for compiler-specific functionality
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// - DAWN_COMPILER_[CLANG|GCC|MSVC]: Compiler detection
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// - DAWN_BREAKPOINT(): Raises an exception and breaks in the debugger
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// - DAWN_BUILTIN_UNREACHABLE(): Hints the compiler that a code path is unreachable
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// - DAWN_NO_DISCARD: An attribute that is C++17 [[nodiscard]] where available
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// - DAWN_(UN)?LIKELY(EXPR): Where available, hints the compiler that the expression will be true
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// (resp. false) to help it generate code that leads to better branch prediction.
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// - DAWN_UNUSED(EXPR): Prevents unused variable/expression warnings on EXPR.
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// - DAWN_UNUSED_FUNC(FUNC): Prevents unused function warnings on FUNC.
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// - DAWN_DECLARE_UNUSED: Prevents unused function warnings a subsequent declaration.
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// Both DAWN_UNUSED_FUNC and DAWN_DECLARE_UNUSED may be necessary, e.g. to suppress clang's
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// unneeded-internal-declaration warning.
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// Clang and GCC, check for __clang__ too to catch clang-cl masquarading as MSVC
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#if defined(__GNUC__) || defined(__clang__)
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# if defined(__clang__)
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# define DAWN_COMPILER_CLANG
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# else
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# define DAWN_COMPILER_GCC
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# endif
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# if defined(__i386__) || defined(__x86_64__)
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# define DAWN_BREAKPOINT() __asm__ __volatile__("int $3\n\t")
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# else
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// TODO(cwallez@chromium.org): Implement breakpoint on all supported architectures
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# define DAWN_BREAKPOINT()
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# endif
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# define DAWN_BUILTIN_UNREACHABLE() __builtin_unreachable()
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# define DAWN_LIKELY(x) __builtin_expect(!!(x), 1)
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# define DAWN_UNLIKELY(x) __builtin_expect(!!(x), 0)
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# if !defined(__has_cpp_attribute)
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# define __has_cpp_attribute(name) 0
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# endif
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// Use warn_unused_result on clang otherwise we can a c++1z extension warning in C++14 mode
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// Also avoid warn_unused_result with GCC because it is only a function attribute and not a type
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// attribute.
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# if __has_cpp_attribute(warn_unused_result) && defined(__clang__)
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# define DAWN_NO_DISCARD __attribute__((warn_unused_result))
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# elif DAWN_CPP_VERSION >= 17 && __has_cpp_attribute(nodiscard)
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# define DAWN_NO_DISCARD [[nodiscard]]
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# endif
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# define DAWN_DECLARE_UNUSED __attribute__((unused))
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// MSVC
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#elif defined(_MSC_VER)
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# define DAWN_COMPILER_MSVC
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extern void __cdecl __debugbreak(void);
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# define DAWN_BREAKPOINT() __debugbreak()
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# define DAWN_BUILTIN_UNREACHABLE() __assume(false)
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// Visual Studio 2017 15.3 adds support for [[nodiscard]]
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# if _MSC_VER >= 1911 && DAWN_CPP_VERSION >= 17
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# define DAWN_NO_DISCARD [[nodiscard]]
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# endif
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# define DAWN_DECLARE_UNUSED
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#else
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# error "Unsupported compiler"
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#endif
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// It seems that (void) EXPR works on all compilers to silence the unused variable warning.
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#define DAWN_UNUSED(EXPR) (void)EXPR
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// Likewise using static asserting on sizeof(&FUNC) seems to make it tagged as used
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#define DAWN_UNUSED_FUNC(FUNC) static_assert(sizeof(&FUNC) == sizeof(void (*)()), "")
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// Add noop replacements for macros for features that aren't supported by the compiler.
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#if !defined(DAWN_LIKELY)
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# define DAWN_LIKELY(X) X
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#endif
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#if !defined(DAWN_UNLIKELY)
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# define DAWN_UNLIKELY(X) X
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#endif
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#if !defined(DAWN_NO_DISCARD)
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# define DAWN_NO_DISCARD
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#endif
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#endif // COMMON_COMPILER_H_
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