Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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85 lines
2.9 KiB
85 lines
2.9 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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#ifndef UPB_MINI_TABLE_INTERNAL_MESSAGE_H_ |
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#define UPB_MINI_TABLE_INTERNAL_MESSAGE_H_ |
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#include "upb/message/types.h" |
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// Must be last. |
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#include "upb/port/def.inc" |
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struct upb_Decoder; |
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typedef const char* _upb_FieldParser(struct upb_Decoder* d, const char* ptr, |
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upb_Message* msg, intptr_t table, |
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uint64_t hasbits, uint64_t data); |
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typedef struct { |
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uint64_t field_data; |
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_upb_FieldParser* field_parser; |
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} _upb_FastTable_Entry; |
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typedef enum { |
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kUpb_ExtMode_NonExtendable = 0, // Non-extendable message. |
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kUpb_ExtMode_Extendable = 1, // Normal extendable message. |
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kUpb_ExtMode_IsMessageSet = 2, // MessageSet message. |
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kUpb_ExtMode_IsMessageSet_ITEM = |
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3, // MessageSet item (temporary only, see decode.c) |
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// During table building we steal a bit to indicate that the message is a map |
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// entry. *Only* used during table building! |
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kUpb_ExtMode_IsMapEntry = 4, |
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} upb_ExtMode; |
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// upb_MiniTable represents the memory layout of a given upb_MessageDef. |
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// The members are public so generated code can initialize them, |
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// but users MUST NOT directly read or write any of its members. |
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struct upb_MiniTable { |
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const union upb_MiniTableSub* subs; |
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const struct upb_MiniTableField* fields; |
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// Must be aligned to sizeof(void*). Doesn't include internal members like |
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// unknown fields, extension dict, pointer to msglayout, etc. |
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uint16_t size; |
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uint16_t field_count; |
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uint8_t ext; // upb_ExtMode, declared as uint8_t so sizeof(ext) == 1 |
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uint8_t dense_below; |
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uint8_t table_mask; |
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uint8_t required_count; // Required fields have the lowest hasbits. |
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// To statically initialize the tables of variable length, we need a flexible |
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// array member, and we need to compile in gnu99 mode (constant initialization |
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// of flexible array members is a GNU extension, not in C99 unfortunately. |
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_upb_FastTable_Entry fasttable[]; |
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}; |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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// A MiniTable for an empty message, used for unlinked sub-messages. |
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extern const struct upb_MiniTable _kUpb_MiniTable_Empty; |
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// Computes a bitmask in which the |l->required_count| lowest bits are set, |
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// except that we skip the lowest bit (because upb never uses hasbit 0). |
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// |
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// Sample output: |
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// requiredmask(1) => 0b10 (0x2) |
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// requiredmask(5) => 0b111110 (0x3e) |
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UPB_INLINE uint64_t upb_MiniTable_requiredmask(const struct upb_MiniTable* l) { |
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int n = l->required_count; |
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assert(0 < n && n <= 63); |
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return ((1ULL << n) - 1) << 1; |
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} |
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#ifdef __cplusplus |
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} /* extern "C" */ |
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#endif |
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#include "upb/port/undef.inc" |
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#endif /* UPB_MINI_TABLE_INTERNAL_MESSAGE_H_ */
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