xref: /aosp_15_r20/external/skia/include/private/base/SkAttributes.h (revision c8dee2aa9b3f27cf6c858bd81872bdeb2c07ed17)

/*
 * Copyright 2022 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkAttributes_DEFINED
#define SkAttributes_DEFINED

#include "include/private/base/SkFeatures.h" // IWYU pragma: keep
#include "include/private/base/SkLoadUserConfig.h" // IWYU pragma: keep

#if defined(__clang__) || defined(__GNUC__)
#  define SK_ATTRIBUTE(attr) __attribute__((attr))
#else
#  define SK_ATTRIBUTE(attr)
#endif

/**
 * If your judgment is better than the compiler's (i.e. you've profiled it),
 * you can use SK_ALWAYS_INLINE to force inlining. E.g.
 *     inline void someMethod() { ... }             // may not be inlined
 *     SK_ALWAYS_INLINE void someMethod() { ... }   // should always be inlined
 */
#if !defined(SK_ALWAYS_INLINE)
#  if defined(SK_BUILD_FOR_WIN)
#    define SK_ALWAYS_INLINE __forceinline
#  else
#    define SK_ALWAYS_INLINE SK_ATTRIBUTE(always_inline) inline
#  endif
#endif

/**
 * If your judgment is better than the compiler's (i.e. you've profiled it),
 * you can use SK_NEVER_INLINE to prevent inlining.
 */
#if !defined(SK_NEVER_INLINE)
#  if defined(SK_BUILD_FOR_WIN)
#    define SK_NEVER_INLINE __declspec(noinline)
#  else
#    define SK_NEVER_INLINE SK_ATTRIBUTE(noinline)
#  endif
#endif

/**
 * Used to annotate a function as taking printf style arguments.
 * `A` is the (1 based) index of the format string argument.
 * `B` is the (1 based) index of the first argument used by the format string.
 */
#if !defined(SK_PRINTF_LIKE)
#  define SK_PRINTF_LIKE(A, B) SK_ATTRIBUTE(format(printf, (A), (B)))
#endif

/**
 * Used to ignore sanitizer warnings.
 */
#if !defined(SK_NO_SANITIZE)
  #if defined(__has_attribute)
    #if __has_attribute(no_sanitize)
      // This should be for clang and versions of gcc >= 8.0
      #define SK_NO_SANITIZE(A) SK_ATTRIBUTE(no_sanitize(A))
    #else
      // For compilers that don't support sanitization, just do nothing.
      #define SK_NO_SANITIZE(A)
    #endif
  #else // no __has_attribute, e.g. MSVC
    #define SK_NO_SANITIZE(A)
  #endif
#endif

/**
 * Annotates a class' non-trivial special functions as trivial for the purposes of calls.
 * Allows a class with a non-trivial destructor to be __is_trivially_relocatable.
 * Use of this attribute on a public API breaks platform ABI.
 * Annotated classes may not hold pointers derived from `this`.
 * Annotated classes must implement move+delete as equivalent to memcpy+free.
 * Use may require more complete types, as callee destroys.
 *
 * https://clang.llvm.org/docs/AttributeReference.html#trivial-abi
 * https://libcxx.llvm.org/DesignDocs/UniquePtrTrivialAbi.html
 */
#if !defined(SK_TRIVIAL_ABI)
#  define SK_TRIVIAL_ABI
#endif

#endif