Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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328 lines
9.4 KiB
328 lines
9.4 KiB
// Protocol Buffers - Google's data interchange format |
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// Copyright 2023 Google LLC. All rights reserved. |
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// |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file or at |
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// https://developers.google.com/open-source/licenses/bsd |
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/* |
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* This is where we define internal portability macros used across upb. |
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* |
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* All of these macros are undef'd in undef.inc to avoid leaking them to 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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#if !((defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \ |
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(defined(__cplusplus) && __cplusplus >= 201402L) || \ |
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(defined(_MSC_VER) && _MSC_VER >= 1900)) |
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#error upb requires C99 or C++14 or MSVC >= 2015. |
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#endif |
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// Portable check for GCC minimum version: |
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// https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html |
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#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__) |
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#define UPB_GNUC_MIN(x, y) \ |
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(__GNUC__ > (x) || __GNUC__ == (x) && __GNUC_MINOR__ >= (y)) |
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#else |
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#define UPB_GNUC_MIN(x, y) 0 |
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#endif |
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#include <assert.h> |
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#include <setjmp.h> |
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#include <stdbool.h> |
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#include <stdint.h> |
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#include <stdio.h> |
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#ifndef UINTPTR_MAX |
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Error, UINTPTR_MAX is undefined |
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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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/* If we always read/write as a consistent type to each address, this shouldn't |
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* violate aliasing. |
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*/ |
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#define UPB_PTR_AT(msg, ofs, type) ((type*)((char*)(msg) + (ofs))) |
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#define UPB_MAPTYPE_STRING 0 |
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// UPB_EXPORT: always generate a public symbol. |
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#if defined(__GNUC__) || defined(__clang__) |
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#define UPB_EXPORT __attribute__((visibility("default"))) __attribute__((used)) |
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#else |
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#define UPB_EXPORT |
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#endif |
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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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#ifdef UPB_BUILD_API |
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#define UPB_API UPB_EXPORT |
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#define UPB_API_INLINE UPB_EXPORT |
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#else |
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#define UPB_API |
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#define UPB_API_INLINE UPB_INLINE |
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#endif |
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#define UPB_MALLOC_ALIGN 8 |
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#define UPB_ALIGN_UP(size, align) (((size) + (align) - 1) / (align) * (align)) |
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#define UPB_ALIGN_DOWN(size, align) ((size) / (align) * (align)) |
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#define UPB_ALIGN_MALLOC(size) UPB_ALIGN_UP(size, UPB_MALLOC_ALIGN) |
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#ifdef __clang__ |
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#define UPB_ALIGN_OF(type) _Alignof(type) |
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#else |
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#define UPB_ALIGN_OF(type) offsetof (struct { char c; type member; }, member) |
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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((bool)(x), 1) |
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#define UPB_UNLIKELY(x) __builtin_expect((bool)(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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// 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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#define UPB_PRINTF(str, first_vararg) __attribute__((format (printf, str, first_vararg))) |
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#elif defined(_MSC_VER) |
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#define UPB_NOINLINE |
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#define UPB_FORCEINLINE |
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#define UPB_NORETURN __declspec(noreturn) |
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#define UPB_PRINTF(str, first_vararg) |
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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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#define UPB_PRINTF(str, first_vararg) |
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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_ASSUME(): in release mode, we tell the compiler to assume this is true. |
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#ifdef NDEBUG |
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#ifdef __GNUC__ |
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#define UPB_ASSUME(expr) if (!(expr)) __builtin_unreachable() |
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#elif defined _MSC_VER |
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#define UPB_ASSUME(expr) if (!(expr)) __assume(0) |
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#else |
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#define UPB_ASSUME(expr) do {} while (false && (expr)) |
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#endif |
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#else |
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#define UPB_ASSUME(expr) assert(expr) |
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#endif |
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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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#if defined(__GNUC__) || defined(__clang__) |
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#define UPB_UNREACHABLE() do { assert(0); __builtin_unreachable(); } while(0) |
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#elif defined(_MSC_VER) |
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#define UPB_UNREACHABLE() \ |
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do { \ |
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assert(0); \ |
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__assume(0); \ |
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} 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_SETJMP() / UPB_LONGJMP(): avoid setting/restoring signal mask. */ |
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#ifdef __APPLE__ |
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#define UPB_SETJMP(buf) _setjmp(buf) |
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#define UPB_LONGJMP(buf, val) _longjmp(buf, val) |
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#else |
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#define UPB_SETJMP(buf) setjmp(buf) |
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#define UPB_LONGJMP(buf, val) longjmp(buf, val) |
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#endif |
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#ifdef __GNUC__ |
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#define UPB_USE_C11_ATOMICS |
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#define UPB_ATOMIC(T) _Atomic(T) |
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#else |
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#define UPB_ATOMIC(T) T |
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#endif |
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/* UPB_PTRADD(ptr, ofs): add pointer while avoiding "NULL + 0" UB */ |
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#define UPB_PTRADD(ptr, ofs) ((ofs) ? (ptr) + (ofs) : (ptr)) |
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#define UPB_PRIVATE(x) x##_dont_copy_me__upb_internal_use_only |
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/* Configure whether fasttable is switched on or not. *************************/ |
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#ifdef __has_attribute |
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#define UPB_HAS_ATTRIBUTE(x) __has_attribute(x) |
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#else |
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#define UPB_HAS_ATTRIBUTE(x) 0 |
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#endif |
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#if UPB_HAS_ATTRIBUTE(musttail) |
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#define UPB_MUSTTAIL __attribute__((musttail)) |
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#else |
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#define UPB_MUSTTAIL |
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#endif |
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#undef UPB_HAS_ATTRIBUTE |
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/* This check is not fully robust: it does not require that we have "musttail" |
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* support available. We need tail calls to avoid consuming arbitrary amounts |
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* of stack space. |
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* |
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* GCC/Clang can mostly be trusted to generate tail calls as long as |
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* optimization is enabled, but, debug builds will not generate tail calls |
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* unless "musttail" is available. |
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* |
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* We should probably either: |
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* 1. require that the compiler supports musttail. |
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* 2. add some fallback code for when musttail isn't available (ie. return |
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* instead of tail calling). This is safe and portable, but this comes at |
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* a CPU cost. |
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*/ |
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#if (defined(__x86_64__) || defined(__aarch64__)) && defined(__GNUC__) |
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#define UPB_FASTTABLE_SUPPORTED 1 |
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#else |
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#define UPB_FASTTABLE_SUPPORTED 0 |
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#endif |
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/* define UPB_ENABLE_FASTTABLE to force fast table support. |
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* This is useful when we want to ensure we are really getting fasttable, |
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* for example for testing or benchmarking. */ |
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#if defined(UPB_ENABLE_FASTTABLE) |
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#if !UPB_FASTTABLE_SUPPORTED |
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#error fasttable is x86-64/ARM64 only and requires GCC or Clang. |
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#endif |
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#define UPB_FASTTABLE 1 |
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/* Define UPB_TRY_ENABLE_FASTTABLE to use fasttable if possible. |
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* This is useful for releasing code that might be used on multiple platforms, |
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* for example the PHP or Ruby C extensions. */ |
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#elif defined(UPB_TRY_ENABLE_FASTTABLE) |
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#define UPB_FASTTABLE UPB_FASTTABLE_SUPPORTED |
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#else |
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#define UPB_FASTTABLE 0 |
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#endif |
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/* UPB_FASTTABLE_INIT() allows protos compiled for fasttable to gracefully |
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* degrade to non-fasttable if the runtime or platform do not support it. */ |
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#if !UPB_FASTTABLE |
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#define UPB_FASTTABLE_INIT(...) |
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#define UPB_FASTTABLE_MASK(mask) -1 |
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#else |
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#define UPB_FASTTABLE_INIT(...) __VA_ARGS__ |
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#define UPB_FASTTABLE_MASK(mask) mask |
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#endif |
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#undef UPB_FASTTABLE_SUPPORTED |
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/* ASAN poisoning (for arena). |
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* If using UPB from an interpreted language like Ruby, a build of the |
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* interpreter compiled with ASAN enabled must be used in order to get sane and |
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* expected behavior. |
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*/ |
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/* Due to preprocessor limitations, the conditional logic for setting |
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* UPN_CLANG_ASAN below cannot be consolidated into a portable one-liner. |
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* See https://gcc.gnu.org/onlinedocs/cpp/_005f_005fhas_005fattribute.html. |
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*/ |
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#if defined(__has_feature) |
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#if __has_feature(address_sanitizer) |
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#define UPB_CLANG_ASAN 1 |
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#else |
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#define UPB_CLANG_ASAN 0 |
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#endif |
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#else |
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#define UPB_CLANG_ASAN 0 |
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#endif |
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#if defined(__SANITIZE_ADDRESS__) || UPB_CLANG_ASAN |
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#define UPB_ASAN 1 |
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#define UPB_ASAN_GUARD_SIZE 32 |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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void __asan_poison_memory_region(void const volatile *addr, size_t size); |
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void __asan_unpoison_memory_region(void const volatile *addr, size_t size); |
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#ifdef __cplusplus |
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} /* extern "C" */ |
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#endif |
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#define UPB_POISON_MEMORY_REGION(addr, size) \ |
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__asan_poison_memory_region((addr), (size)) |
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#define UPB_UNPOISON_MEMORY_REGION(addr, size) \ |
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__asan_unpoison_memory_region((addr), (size)) |
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#else |
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#define UPB_ASAN 0 |
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#define UPB_ASAN_GUARD_SIZE 0 |
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#define UPB_POISON_MEMORY_REGION(addr, size) \ |
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((void)(addr), (void)(size)) |
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#define UPB_UNPOISON_MEMORY_REGION(addr, size) \ |
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((void)(addr), (void)(size)) |
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#endif |
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/* Disable proto2 arena behavior (TEMPORARY) **********************************/ |
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#ifdef UPB_DISABLE_PROTO2_ENUM_CHECKING |
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#define UPB_TREAT_PROTO2_ENUMS_LIKE_PROTO3 1 |
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#else |
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#define UPB_TREAT_PROTO2_ENUMS_LIKE_PROTO3 0 |
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#endif |
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#if defined(__cplusplus) |
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#if defined(__clang__) || UPB_GNUC_MIN(6, 0) |
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// https://gcc.gnu.org/gcc-6/changes.html |
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#if __cplusplus >= 201402L |
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#define UPB_DEPRECATED [[deprecated]] |
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#else |
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#define UPB_DEPRECATED __attribute__((deprecated)) |
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#endif |
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#else |
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#define UPB_DEPRECATED |
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#endif |
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#else |
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#define UPB_DEPRECATED |
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#endif |
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// begin:google_only |
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// #define UPB_IS_GOOGLE3 |
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// end:google_only |
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#if defined(UPB_IS_GOOGLE3) && !defined(UPB_BOOTSTRAP_STAGE0) |
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#define UPB_DESC(sym) proto2_##sym |
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#else |
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#define UPB_DESC(sym) google_protobuf_##sym |
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#endif
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