2 ** Data structures for message tables, used for parsing and serialization.
3 ** This are much lighter-weight than full reflection, but they are do not
4 ** have enough information to convert to text format, JSON, etc.
6 ** The definitions in this file are internal to upb.
22 /** upb_msglayout *************************************************************/
24 /* upb_msglayout represents the memory layout of a given upb_msgdef. The
25 * members are public so generated code can initialize them, but users MUST NOT
26 * read or write any of its members. */
31 int16_t presence; /* If >0, hasbit_index+1. If <0, oneof_index+1. */
32 uint16_t submsg_index; /* undefined if descriptortype != MESSAGE or GROUP. */
33 uint8_t descriptortype;
35 } upb_msglayout_field;
37 typedef struct upb_msglayout {
38 const struct upb_msglayout *const* submsgs;
39 const upb_msglayout_field *fields;
40 /* Must be aligned to sizeof(void*). Doesn't include internal members like
41 * unknown fields, extension dict, pointer to msglayout, etc. */
47 /** Message internal representation *******************************************/
49 /* Our internal representation for repeated fields. */
51 void *data; /* Each element is element_size. */
52 size_t len; /* Measured in elements. */
53 size_t size; /* Measured in elements. */
56 upb_msg *upb_msg_new(const upb_msglayout *l, upb_arena *a);
57 upb_msg *upb_msg_new(const upb_msglayout *l, upb_arena *a);
59 void upb_msg_addunknown(upb_msg *msg, const char *data, size_t len,
61 const char *upb_msg_getunknown(const upb_msg *msg, size_t *len);
63 upb_array *upb_array_new(upb_arena *a);
69 #endif /* UPB_MSG_H_ */