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346 lines
10 KiB
346 lines
10 KiB
/*
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* Copyright © 2014 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef UTIL_MACROS_H
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#define UTIL_MACROS_H
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#include <assert.h>
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/* Compute the size of an array */
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#ifndef ARRAY_SIZE
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# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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#endif
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/* For compatibility with Clang's __has_builtin() */
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#ifndef __has_builtin
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# define __has_builtin(x) 0
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#endif
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/**
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* __builtin_expect macros
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*/
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#if !defined(HAVE___BUILTIN_EXPECT)
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# define __builtin_expect(x, y) (x)
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#endif
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#ifndef likely
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# ifdef HAVE___BUILTIN_EXPECT
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# define likely(x) __builtin_expect(!!(x), 1)
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# define unlikely(x) __builtin_expect(!!(x), 0)
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# else
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# define likely(x) (x)
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# define unlikely(x) (x)
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# endif
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#endif
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/**
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* Static (compile-time) assertion.
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* Basically, use COND to dimension an array. If COND is false/zero the
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* array size will be -1 and we'll get a compilation error.
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*/
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#define STATIC_ASSERT(COND) \
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do { \
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(void) sizeof(char [1 - 2*!(COND)]); \
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} while (0)
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/**
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* Unreachable macro. Useful for suppressing "control reaches end of non-void
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* function" warnings.
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*/
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#if defined(HAVE___BUILTIN_UNREACHABLE) || __has_builtin(__builtin_unreachable)
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#define unreachable(str) \
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do { \
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assert(!str); \
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__builtin_unreachable(); \
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} while (0)
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#elif defined (_MSC_VER)
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#define unreachable(str) \
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do { \
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assert(!str); \
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__assume(0); \
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} while (0)
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#else
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#define unreachable(str) assert(!str)
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#endif
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/**
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* Assume macro. Useful for expressing our assumptions to the compiler,
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* typically for purposes of silencing warnings.
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*/
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#if __has_builtin(__builtin_assume)
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#define assume(expr) \
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do { \
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assert(expr); \
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__builtin_assume(expr); \
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} while (0)
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#elif defined HAVE___BUILTIN_UNREACHABLE
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#define assume(expr) ((expr) ? ((void) 0) \
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: (assert(!"assumption failed"), \
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__builtin_unreachable()))
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#elif defined (_MSC_VER)
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#define assume(expr) __assume(expr)
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#else
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#define assume(expr) assert(expr)
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#endif
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/* Attribute const is used for functions that have no effects other than their
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* return value, and only rely on the argument values to compute the return
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* value. As a result, calls to it can be CSEed. Note that using memory
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* pointed to by the arguments is not allowed for const functions.
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*/
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#ifdef HAVE_FUNC_ATTRIBUTE_CONST
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#define ATTRIBUTE_CONST __attribute__((__const__))
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#else
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#define ATTRIBUTE_CONST
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#endif
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#ifdef HAVE_FUNC_ATTRIBUTE_FLATTEN
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#define FLATTEN __attribute__((__flatten__))
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#else
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#define FLATTEN
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#endif
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#ifdef HAVE_FUNC_ATTRIBUTE_FORMAT
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#define PRINTFLIKE(f, a) __attribute__ ((format(__printf__, f, a)))
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#else
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#define PRINTFLIKE(f, a)
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#endif
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#ifdef HAVE_FUNC_ATTRIBUTE_MALLOC
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#define MALLOCLIKE __attribute__((__malloc__))
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#else
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#define MALLOCLIKE
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#endif
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/* Forced function inlining */
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/* Note: Clang also sets __GNUC__ (see other cases below) */
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#ifndef ALWAYS_INLINE
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# if defined(__GNUC__)
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# define ALWAYS_INLINE inline __attribute__((always_inline))
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# elif defined(_MSC_VER)
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# define ALWAYS_INLINE __forceinline
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# else
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# define ALWAYS_INLINE inline
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# endif
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#endif
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/* Used to optionally mark structures with misaligned elements or size as
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* packed, to trade off performance for space.
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*/
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#ifdef HAVE_FUNC_ATTRIBUTE_PACKED
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#define PACKED __attribute__((__packed__))
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#else
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#define PACKED
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#endif
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/* Attribute pure is used for functions that have no effects other than their
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* return value. As a result, calls to it can be dead code eliminated.
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*/
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#ifdef HAVE_FUNC_ATTRIBUTE_PURE
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#define ATTRIBUTE_PURE __attribute__((__pure__))
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#else
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#define ATTRIBUTE_PURE
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#endif
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#ifdef HAVE_FUNC_ATTRIBUTE_RETURNS_NONNULL
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#define ATTRIBUTE_RETURNS_NONNULL __attribute__((__returns_nonnull__))
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#else
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#define ATTRIBUTE_RETURNS_NONNULL
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#endif
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#ifndef NORETURN
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# ifdef _MSC_VER
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# define NORETURN __declspec(noreturn)
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# elif defined HAVE_FUNC_ATTRIBUTE_NORETURN
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# define NORETURN __attribute__((__noreturn__))
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# else
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# define NORETURN
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# endif
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#endif
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#ifdef __cplusplus
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/**
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* Macro function that evaluates to true if T is a trivially
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* destructible type -- that is, if its (non-virtual) destructor
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* performs no action and all member variables and base classes are
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* trivially destructible themselves.
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*/
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# if (defined(__clang__) && defined(__has_feature))
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# if __has_feature(has_trivial_destructor)
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# define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
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# endif
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# elif defined(__GNUC__)
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# if ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)))
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# define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
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# endif
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# elif defined(_MSC_VER) && !defined(__INTEL_COMPILER)
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# define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
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# endif
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# ifndef HAS_TRIVIAL_DESTRUCTOR
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/* It's always safe (if inefficient) to assume that a
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* destructor is non-trivial.
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*/
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# define HAS_TRIVIAL_DESTRUCTOR(T) (false)
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# endif
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#endif
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/**
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* PUBLIC/USED macros
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*
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* If we build the library with gcc's -fvisibility=hidden flag, we'll
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* use the PUBLIC macro to mark functions that are to be exported.
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*
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* We also need to define a USED attribute, so the optimizer doesn't
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* inline a static function that we later use in an alias. - ajax
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*/
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#ifndef PUBLIC
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# if defined(__GNUC__)
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# define PUBLIC __attribute__((visibility("default")))
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# define USED __attribute__((used))
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# elif defined(_MSC_VER)
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# define PUBLIC __declspec(dllexport)
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# define USED
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# else
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# define PUBLIC
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# define USED
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# endif
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#endif
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/**
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* UNUSED marks variables (or sometimes functions) that have to be defined,
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* but are sometimes (or always) unused beyond that. A common case is for
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* a function parameter to be used in some build configurations but not others.
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* Another case is fallback vfuncs that don't do anything with their params.
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*
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* Note that this should not be used for identifiers used in `assert()`;
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* see ASSERTED below.
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*/
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#ifdef HAVE_FUNC_ATTRIBUTE_UNUSED
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#define UNUSED __attribute__((unused))
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#else
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#define UNUSED
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#endif
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/**
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* Use ASSERTED to indicate that an identifier is unused outside of an `assert()`,
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* so that assert-free builds don't get "unused variable" warnings.
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*/
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#ifdef NDEBUG
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#define ASSERTED UNUSED
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#else
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#define ASSERTED
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#endif
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#ifdef HAVE_FUNC_ATTRIBUTE_WARN_UNUSED_RESULT
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#define MUST_CHECK __attribute__((warn_unused_result))
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#else
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#define MUST_CHECK
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#endif
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#if defined(__GNUC__)
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#define ATTRIBUTE_NOINLINE __attribute__((noinline))
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#else
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#define ATTRIBUTE_NOINLINE
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#endif
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/**
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* Check that STRUCT::FIELD can hold MAXVAL. We use a lot of bitfields
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* in Mesa/gallium. We have to be sure they're of sufficient size to
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* hold the largest expected value.
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* Note that with MSVC, enums are signed and enum bitfields need one extra
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* high bit (always zero) to ensure the max value is handled correctly.
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* This macro will detect that with MSVC, but not GCC.
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*/
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#define ASSERT_BITFIELD_SIZE(STRUCT, FIELD, MAXVAL) \
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do { \
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ASSERTED STRUCT s; \
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s.FIELD = (MAXVAL); \
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assert((int) s.FIELD == (MAXVAL) && "Insufficient bitfield size!"); \
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} while (0)
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/** Compute ceiling of integer quotient of A divided by B. */
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#define DIV_ROUND_UP( A, B ) ( ((A) + (B) - 1) / (B) )
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/** Clamp X to [MIN,MAX]. Turn NaN into MIN, arbitrarily. */
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#define CLAMP( X, MIN, MAX ) ( (X)>(MIN) ? ((X)>(MAX) ? (MAX) : (X)) : (MIN) )
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/** Minimum of two values: */
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#define MIN2( A, B ) ( (A)<(B) ? (A) : (B) )
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/** Maximum of two values: */
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#define MAX2( A, B ) ( (A)>(B) ? (A) : (B) )
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/** Minimum and maximum of three values: */
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#define MIN3( A, B, C ) ((A) < (B) ? MIN2(A, C) : MIN2(B, C))
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#define MAX3( A, B, C ) ((A) > (B) ? MAX2(A, C) : MAX2(B, C))
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/** Align a value to a power of two */
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#define ALIGN_POT(x, pot_align) (((x) + (pot_align) - 1) & ~((pot_align) - 1))
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/**
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* Macro for declaring an explicit conversion operator. Defaults to an
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* implicit conversion if C++11 is not supported.
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*/
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#if __cplusplus >= 201103L
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#define EXPLICIT_CONVERSION explicit
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#elif defined(__cplusplus)
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#define EXPLICIT_CONVERSION
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#endif
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/** Set a single bit */
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#define BITFIELD_BIT(b) (1u << (b))
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/** Set all bits up to excluding bit b */
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#define BITFIELD_MASK(b) \
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((b) == 32 ? (~0u) : BITFIELD_BIT((b) % 32) - 1)
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/** Set count bits starting from bit b */
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#define BITFIELD_RANGE(b, count) \
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(BITFIELD_MASK((b) + (count)) & ~BITFIELD_MASK(b))
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/** Set a single bit */
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#define BITFIELD64_BIT(b) (1ull << (b))
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/** Set all bits up to excluding bit b */
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#define BITFIELD64_MASK(b) \
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((b) == 64 ? (~0ull) : BITFIELD64_BIT(b) - 1)
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/** Set count bits starting from bit b */
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#define BITFIELD64_RANGE(b, count) \
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(BITFIELD64_MASK((b) + (count)) & ~BITFIELD64_MASK(b))
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/* TODO: In future we should try to move this to u_debug.h once header
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* dependencies are reorganised to allow this.
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*/
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enum pipe_debug_type
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{
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PIPE_DEBUG_TYPE_OUT_OF_MEMORY = 1,
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PIPE_DEBUG_TYPE_ERROR,
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PIPE_DEBUG_TYPE_SHADER_INFO,
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PIPE_DEBUG_TYPE_PERF_INFO,
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PIPE_DEBUG_TYPE_INFO,
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PIPE_DEBUG_TYPE_FALLBACK,
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PIPE_DEBUG_TYPE_CONFORMANCE,
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};
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#endif /* UTIL_MACROS_H */
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