// Copyright 2008 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MINI_CHROMIUM_BASE_COMPILER_SPECIFIC_H_
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#define MINI_CHROMIUM_BASE_COMPILER_SPECIFIC_H_
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#include "build/build_config.h"
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// Annotate a variable indicating it's ok if the variable is not used.
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// (Typically used to silence a compiler warning when the assignment
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// is important for some other reason.)
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// Use like:
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// int x = ...;
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// ALLOW_UNUSED_LOCAL(x);
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#define ALLOW_UNUSED_LOCAL(x) false ? (void)x : (void)0
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// Annotate a typedef or function indicating it's ok if it's not used.
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// Use like:
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// typedef Foo Bar ALLOW_UNUSED_TYPE;
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#if defined(COMPILER_GCC)
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#define ALLOW_UNUSED_TYPE __attribute__((unused))
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#else
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#define ALLOW_UNUSED_TYPE
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#endif
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// Specify memory alignment for structs, classes, etc.
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// Use like:
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// class ALIGNAS(16) MyClass { ... }
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// ALIGNAS(16) int array[4];
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#if defined(COMPILER_MSVC)
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#define ALIGNAS(byte_alignment) __declspec(align(byte_alignment))
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#elif defined(COMPILER_GCC)
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#define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
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#endif
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#if defined(COMPILER_MSVC)
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#define WARN_UNUSED_RESULT
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#else
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#define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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#endif
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#if defined(COMPILER_MSVC)
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#define PRINTF_FORMAT(format_param, dots_param)
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#else
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#define PRINTF_FORMAT(format_param, dots_param) \
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__attribute__((format(printf, format_param, dots_param)))
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#endif
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// Sanitizers annotations.
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#if defined(__has_attribute)
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#if __has_attribute(no_sanitize)
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#define NO_SANITIZE(what) __attribute__((no_sanitize(what)))
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#endif
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#endif
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#if !defined(NO_SANITIZE)
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#define NO_SANITIZE(what)
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#endif
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// DISABLE_CFI_ICALL -- Disable Control Flow Integrity indirect call checks.
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#if defined(OS_WIN)
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// Windows also needs __declspec(guard(nocf)).
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#define DISABLE_CFI_ICALL NO_SANITIZE("cfi-icall") __declspec(guard(nocf))
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#else
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#define DISABLE_CFI_ICALL NO_SANITIZE("cfi-icall")
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#endif
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// Compiler feature-detection.
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// clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension
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#if defined(__has_feature)
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#define HAS_FEATURE(FEATURE) __has_feature(FEATURE)
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#else
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#define HAS_FEATURE(FEATURE) 0
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#endif
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// Macro for telling -Wimplicit-fallthrough that a fallthrough is intentional.
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#if __cplusplus >= 201703L // C++17
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#define FALLTHROUGH [[fallthrough]]
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#elif defined(__clang__)
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#define FALLTHROUGH [[clang::fallthrough]]
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#else
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#define FALLTHROUGH
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#endif
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#endif // MINI_CHROMIUM_BASE_COMPILER_SPECIFIC_H_
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