--- /dev/null
+
+#ifndef UPB_LEGACY_MSG_REFLECTION_H_
+#define UPB_LEGACY_MSG_REFLECTION_H_
+
+#include "upb/upb.h"
+#include "upb/msg.h"
+
+#include "upb/port_def.inc"
+
+struct upb_map;
+typedef struct upb_map upb_map;
+
+struct upb_mapiter;
+typedef struct upb_mapiter upb_mapiter;
+
+/** upb_msgval ****************************************************************/
+
+/* A union representing all possible protobuf values. Used for generic get/set
+ * operations. */
+
+typedef union {
+ bool b;
+ float flt;
+ double dbl;
+ int32_t i32;
+ int64_t i64;
+ uint32_t u32;
+ uint64_t u64;
+ const upb_map* map;
+ const upb_msg* msg;
+ const upb_array* arr;
+ const void* ptr;
+ upb_strview str;
+} upb_msgval;
+
+#define ACCESSORS(name, membername, ctype) \
+ UPB_INLINE ctype upb_msgval_get ## name(upb_msgval v) { \
+ return v.membername; \
+ } \
+ UPB_INLINE void upb_msgval_set ## name(upb_msgval *v, ctype cval) { \
+ v->membername = cval; \
+ } \
+ UPB_INLINE upb_msgval upb_msgval_ ## name(ctype v) { \
+ upb_msgval ret; \
+ ret.membername = v; \
+ return ret; \
+ }
+
+ACCESSORS(bool, b, bool)
+ACCESSORS(float, flt, float)
+ACCESSORS(double, dbl, double)
+ACCESSORS(int32, i32, int32_t)
+ACCESSORS(int64, i64, int64_t)
+ACCESSORS(uint32, u32, uint32_t)
+ACCESSORS(uint64, u64, uint64_t)
+ACCESSORS(map, map, const upb_map*)
+ACCESSORS(msg, msg, const upb_msg*)
+ACCESSORS(ptr, ptr, const void*)
+ACCESSORS(arr, arr, const upb_array*)
+ACCESSORS(str, str, upb_strview)
+
+#undef ACCESSORS
+
+UPB_INLINE upb_msgval upb_msgval_makestr(const char *data, size_t size) {
+ return upb_msgval_str(upb_strview_make(data, size));
+}
+
+/** upb_msg *******************************************************************/
+
+/* A upb_msg represents a protobuf message. It always corresponds to a specific
+ * upb_msglayout, which describes how it is laid out in memory. */
+
+/* Read-only message API. Can be safely called by anyone. */
+
+/* Returns the value associated with this field:
+ * - for scalar fields (including strings), the value directly.
+ * - return upb_msg*, or upb_map* for msg/map.
+ * If the field is unset for these field types, returns NULL.
+ *
+ * TODO(haberman): should we let users store cached array/map/msg
+ * pointers here for fields that are unset? Could be useful for the
+ * strongly-owned submessage model (ie. generated C API that doesn't use
+ * arenas).
+ */
+upb_msgval upb_msg_get(const upb_msg *msg,
+ int field_index,
+ const upb_msglayout *l);
+
+/* May only be called for fields where upb_fielddef_haspresence(f) == true. */
+bool upb_msg_has(const upb_msg *msg,
+ int field_index,
+ const upb_msglayout *l);
+
+/* Mutable message API. May only be called by the owner of the message who
+ * knows its ownership scheme and how to keep it consistent. */
+
+/* Sets the given field to the given value. Does not perform any memory
+ * management: if you overwrite a pointer to a msg/array/map/string without
+ * cleaning it up (or using an arena) it will leak.
+ */
+void upb_msg_set(upb_msg *msg,
+ int field_index,
+ upb_msgval val,
+ const upb_msglayout *l);
+
+/* For a primitive field, set it back to its default. For repeated, string, and
+ * submessage fields set it back to NULL. This could involve releasing some
+ * internal memory (for example, from an extension dictionary), but it is not
+ * recursive in any way and will not recover any memory that may be used by
+ * arrays/maps/strings/msgs that this field may have pointed to.
+ */
+bool upb_msg_clearfield(upb_msg *msg,
+ int field_index,
+ const upb_msglayout *l);
+
+/* TODO(haberman): copyfrom()/mergefrom()? */
+
+/** upb_array *****************************************************************/
+
+/* A upb_array stores data for a repeated field. The memory management
+ * semantics are the same as upb_msg. A upb_array allocates dynamic
+ * memory internally for the array elements. */
+
+upb_fieldtype_t upb_array_type(const upb_array *arr);
+
+/* Read-only interface. Safe for anyone to call. */
+
+size_t upb_array_size(const upb_array *arr);
+upb_msgval upb_array_get(const upb_array *arr, upb_fieldtype_t type, size_t i);
+
+/* Write interface. May only be called by the message's owner who can enforce
+ * its memory management invariants. */
+
+bool upb_array_set(upb_array *arr, upb_fieldtype_t type, size_t i,
+ upb_msgval val, upb_arena *arena);
+
+/** upb_map *******************************************************************/
+
+/* A upb_map stores data for a map field. The memory management semantics are
+ * the same as upb_msg, with one notable exception. upb_map will internally
+ * store a copy of all string keys, but *not* any string values or submessages.
+ * So you must ensure that any string or message values outlive the map, and you
+ * must delete them manually when they are no longer required. */
+
+upb_map *upb_map_new(upb_fieldtype_t ktype, upb_fieldtype_t vtype,
+ upb_arena *a);
+
+/* Read-only interface. Safe for anyone to call. */
+
+size_t upb_map_size(const upb_map *map);
+upb_fieldtype_t upb_map_keytype(const upb_map *map);
+upb_fieldtype_t upb_map_valuetype(const upb_map *map);
+bool upb_map_get(const upb_map *map, upb_msgval key, upb_msgval *val);
+
+/* Write interface. May only be called by the message's owner who can enforce
+ * its memory management invariants. */
+
+/* Sets or overwrites an entry in the map. Return value indicates whether
+ * the operation succeeded or failed with OOM, and also whether an existing
+ * key was replaced or not. */
+bool upb_map_set(upb_map *map,
+ upb_msgval key, upb_msgval val,
+ upb_msgval *valremoved);
+
+/* Deletes an entry in the map. Returns true if the key was present. */
+bool upb_map_del(upb_map *map, upb_msgval key);
+
+/** upb_mapiter ***************************************************************/
+
+/* For iterating over a map. Map iterators are invalidated by mutations to the
+ * map, but an invalidated iterator will never return junk or crash the process.
+ * An invalidated iterator may return entries that were already returned though,
+ * and if you keep invalidating the iterator during iteration, the program may
+ * enter an infinite loop. */
+
+size_t upb_mapiter_sizeof(void);
+
+void upb_mapiter_begin(upb_mapiter *i, const upb_map *t);
+upb_mapiter *upb_mapiter_new(const upb_map *t, upb_alloc *a);
+void upb_mapiter_free(upb_mapiter *i, upb_alloc *a);
+void upb_mapiter_next(upb_mapiter *i);
+bool upb_mapiter_done(const upb_mapiter *i);
+
+upb_msgval upb_mapiter_key(const upb_mapiter *i);
+upb_msgval upb_mapiter_value(const upb_mapiter *i);
+void upb_mapiter_setdone(upb_mapiter *i);
+bool upb_mapiter_isequal(const upb_mapiter *i1, const upb_mapiter *i2);
+
+#include "upb/port_undef.inc"
+
+#endif /* UPB_LEGACY_MSG_REFLECTION_H_ */
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