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https://github.com/openvswitch/ovs
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4749f73d12
An occasionally significant problem with the standard "assert" macro is that it writes the failure message to stderr. In our daemons, stderr is generally redirected to /dev/null. It's more useful to write the failure message to the log, which is what the new ovs_assert macro introduced in this patch does. Signed-off-by: Ben Pfaff <blp@nicira.com> Acked-by: Ethan Jackson <ethan@nicira.com>
63 lines
2.4 KiB
C
63 lines
2.4 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
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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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*/
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#ifndef COMPILER_H
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#define COMPILER_H 1
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#if __GNUC__ && !__CHECKER__
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#define NO_RETURN __attribute__((__noreturn__))
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#define OVS_UNUSED __attribute__((__unused__))
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#define PRINTF_FORMAT(FMT, ARG1) __attribute__((__format__(printf, FMT, ARG1)))
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#define STRFTIME_FORMAT(FMT) __attribute__((__format__(__strftime__, FMT, 0)))
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#define MALLOC_LIKE __attribute__((__malloc__))
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#define ALWAYS_INLINE __attribute__((always_inline))
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#define WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
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#define SENTINEL(N) __attribute__((sentinel(N)))
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#define OVS_LIKELY(CONDITION) __builtin_expect(!!(CONDITION), 1)
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#define OVS_UNLIKELY(CONDITION) __builtin_expect(!!(CONDITION), 0)
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#else
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#define NO_RETURN
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#define OVS_UNUSED
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#define PRINTF_FORMAT(FMT, ARG1)
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#define STRFTIME_FORMAT(FMT)
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#define MALLOC_LIKE
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#define ALWAYS_INLINE
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#define WARN_UNUSED_RESULT
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#define SENTINEL(N)
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#define OVS_LIKELY(CONDITION) (!!(CONDITION))
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#define OVS_UNLIKELY(CONDITION) (!!(CONDITION))
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#endif
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/* ISO C says that a C implementation may choose any integer type for an enum
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* that is sufficient to hold all of its values. Common ABIs (such as the
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* System V ABI used on i386 GNU/Linux) always use a full-sized "int", even
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* when a smaller type would suffice.
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*
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* In GNU C, "enum __attribute__((packed)) name { ... }" defines 'name' as an
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* enum compatible with a type that is no bigger than necessary. This is the
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* intended use of OVS_PACKED_ENUM.
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*
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* OVS_PACKED_ENUM is intended for use only as a space optimization, since it
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* only works with GCC. That means that it must not be used in wire protocols
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* or otherwise exposed outside of a single process. */
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#if __GNUC__ && !__CHECKER__
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#define OVS_PACKED_ENUM __attribute__((__packed__))
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#else
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#define OVS_PACKED_ENUM
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#endif
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#endif /* compiler.h */
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