Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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152 lines
4.5 KiB
152 lines
4.5 KiB
/* |
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* This is where we define macros used across upb. |
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* |
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* All of these macros are undef'd in port_undef.inc to avoid leaking them to |
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* users. |
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* |
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* The correct usage is: |
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* |
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* #include "upb/foobar.h" |
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* #include "upb/baz.h" |
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* |
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* // MUST be last included header. |
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* #include "upb/port_def.inc" |
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* |
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* // Code for this file. |
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* // <...> |
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* |
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* // Can be omitted for .c files, required for .h. |
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* #include "upb/port_undef.inc" |
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* |
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* This file is private and must not be included by users! |
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*/ |
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#ifndef UINTPTR_MAX |
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#error must include stdint.h first |
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#endif |
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#if UINTPTR_MAX == 0xffffffff |
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#define UPB_SIZE(size32, size64) size32 |
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#else |
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#define UPB_SIZE(size32, size64) size64 |
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#endif |
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#define UPB_FIELD_AT(msg, fieldtype, offset) \ |
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*(fieldtype*)((const char*)(msg) + offset) |
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#define UPB_READ_ONEOF(msg, fieldtype, offset, case_offset, case_val, default) \ |
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UPB_FIELD_AT(msg, int, case_offset) == case_val \ |
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? UPB_FIELD_AT(msg, fieldtype, offset) \ |
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: default |
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#define UPB_WRITE_ONEOF(msg, fieldtype, offset, value, case_offset, case_val) \ |
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UPB_FIELD_AT(msg, int, case_offset) = case_val; \ |
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UPB_FIELD_AT(msg, fieldtype, offset) = value; |
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/* UPB_INLINE: inline if possible, emit standalone code if required. */ |
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#ifdef __cplusplus |
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#define UPB_INLINE inline |
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#elif defined (__GNUC__) || defined(__clang__) |
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#define UPB_INLINE static __inline__ |
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#else |
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#define UPB_INLINE static |
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#endif |
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/* Hints to the compiler about likely/unlikely branches. */ |
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#if defined (__GNUC__) || defined(__clang__) |
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#define UPB_LIKELY(x) __builtin_expect((x),1) |
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#define UPB_UNLIKELY(x) __builtin_expect((x),0) |
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#else |
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#define UPB_LIKELY(x) (x) |
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#define UPB_UNLIKELY(x) (x) |
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#endif |
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/* Define UPB_BIG_ENDIAN manually if you're on big endian and your compiler |
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* doesn't provide these preprocessor symbols. */ |
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#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) |
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#define UPB_BIG_ENDIAN |
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#endif |
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/* Macros for function attributes on compilers that support them. */ |
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#ifdef __GNUC__ |
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#define UPB_FORCEINLINE __inline__ __attribute__((always_inline)) |
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#define UPB_NOINLINE __attribute__((noinline)) |
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#define UPB_NORETURN __attribute__((__noreturn__)) |
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#else /* !defined(__GNUC__) */ |
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#define UPB_FORCEINLINE |
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#define UPB_NOINLINE |
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#define UPB_NORETURN |
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#endif |
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#if __STDC_VERSION__ >= 199901L || __cplusplus >= 201103L |
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/* C99/C++11 versions. */ |
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#include <stdio.h> |
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#define _upb_snprintf snprintf |
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#define _upb_vsnprintf vsnprintf |
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#define _upb_va_copy(a, b) va_copy(a, b) |
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#elif defined(_MSC_VER) |
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/* Microsoft C/C++ versions. */ |
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#include <stdarg.h> |
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#include <stdio.h> |
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#if _MSC_VER < 1900 |
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int msvc_snprintf(char* s, size_t n, const char* format, ...); |
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int msvc_vsnprintf(char* s, size_t n, const char* format, va_list arg); |
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#define UPB_MSVC_VSNPRINTF |
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#define _upb_snprintf msvc_snprintf |
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#define _upb_vsnprintf msvc_vsnprintf |
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#else |
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#define _upb_snprintf snprintf |
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#define _upb_vsnprintf vsnprintf |
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#endif |
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#define _upb_va_copy(a, b) va_copy(a, b) |
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#elif defined __GNUC__ |
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/* A few hacky workarounds for functions not in C89. |
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* For internal use only! |
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* TODO(haberman): fix these by including our own implementations, or finding |
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* another workaround. |
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*/ |
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#define _upb_snprintf __builtin_snprintf |
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#define _upb_vsnprintf __builtin_vsnprintf |
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#define _upb_va_copy(a, b) __va_copy(a, b) |
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#else |
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#error Need implementations of [v]snprintf and va_copy |
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#endif |
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#ifdef __cplusplus |
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#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__) || \ |
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(defined(_MSC_VER) && _MSC_VER >= 1900) |
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/* C++11 is present */ |
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#else |
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#error upb requires C++11 for C++ support |
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#endif |
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#endif |
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#define UPB_MAX(x, y) ((x) > (y) ? (x) : (y)) |
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#define UPB_MIN(x, y) ((x) < (y) ? (x) : (y)) |
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#define UPB_UNUSED(var) (void)var |
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/* UPB_ASSERT(): in release mode, we use the expression without letting it be |
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* evaluated. This prevents "unused variable" warnings. */ |
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#ifdef NDEBUG |
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#define UPB_ASSERT(expr) do {} while (false && (expr)) |
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#else |
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#define UPB_ASSERT(expr) assert(expr) |
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#endif |
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/* UPB_ASSERT_DEBUGVAR(): assert that uses functions or variables that only |
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* exist in debug mode. This turns into regular assert. */ |
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#define UPB_ASSERT_DEBUGVAR(expr) assert(expr) |
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#if defined(__GNUC__) || defined(__clang__) |
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#define UPB_UNREACHABLE() do { assert(0); __builtin_unreachable(); } while(0) |
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#else |
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#define UPB_UNREACHABLE() do { assert(0); } while(0) |
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#endif |
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/* UPB_INFINITY representing floating-point positive infinity. */ |
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#include <math.h> |
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#ifdef INFINITY |
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#define UPB_INFINITY INFINITY |
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#else |
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#define UPB_INFINITY (1.0 / 0.0) |
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#endif
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