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Diffstat (limited to 'src/upb_mm.h')
| -rw-r--r-- | src/upb_mm.h | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/src/upb_mm.h b/src/upb_mm.h deleted file mode 100644 index 2e3e082..0000000 --- a/src/upb_mm.h +++ /dev/null @@ -1,168 +0,0 @@ -/* - * upb - a minimalist implementation of protocol buffers. - * - * Copyright (c) 2009 Joshua Haberman. See LICENSE for details. - * - * A parsed protobuf is represented in memory as a tree. The three kinds of - * nodes in this tree are messages, arrays, and strings. This file defines - * a memory-management scheme for making sure that these nodes are colected - * at the right times. - * - * The basic strategy is reference-counting, but with a twist. Since any - * dynamic language that wishes to reference these nodes will need its own, - * language-specific structure, we provide two different kinds of references: - * - * - counted references. these are references that are tracked with only a - * reference count. They are used for two separate purposes: - * 1. for references within the tree, from one node to another. - * 2. for external references into the tree, where the referer does not need - * a separate message structure. - * - listed references. these are references that have their own separate - * data record. these separate records are kept in a linked list. - */ - -#ifndef UPB_MM_H_ -#define UPB_MM_H_ - -#include "upb.h" -#include "upb_string.h" -#include "upb_array.h" -#include "upb_msg.h" - -#ifdef __cplusplus -extern "C" { -#endif - -/* Structure definitions. *****************************************************/ - -typedef int16_t upb_mm_id; - -struct upb_msg; -struct upb_array; -struct upb_string; -struct upb_fielddef; - -struct upb_mm_ref; -/* Info about a mm. */ -struct upb_mm { - /* fromref is set iff this call is from getfieldref or getelemref. */ - struct upb_mm_ref *(*newref_cb)(struct upb_mm_ref *fromref, - union upb_mmptr p, upb_mm_ptrtype type); -}; - -struct upb_mm_ref { - union upb_mmptr p; - /* This is slightly wasteful, because the mm-specific ref will probably also - * contain the information about what kind of ref this is, in a different - * form. */ - upb_mm_ptrtype type; - struct upb_mm *mm; /* TODO: There are ways to shrink this. */ - struct upb_mm_ref *next; /* Linked list for refs to the same value. */ -}; - -/* Functions for working with listed references. *****************************/ - -/* Create a new top-level message and create a single ref for it. */ -struct upb_mm_ref *upb_mm_newmsg_ref(struct upb_msgdef *def, struct upb_mm *mm); - -/* Given a pointer to an existing msg, array, or string, find a ref for this - * mm, creating one if necessary. 'created' indicates whether the returned - * reference was just created. */ -struct upb_mm_ref *upb_mm_getref(union upb_mmptr p, upb_mm_ptrtype type, - struct upb_mm *mm, bool *created); - -/* f must be ismm == true. The msg field may or may not be set (will be - * created if it doesn't exist). If a ref already exists for the given field, - * returns it, otherwise calls the given callback to create one. 'created' - * indicates whether a new reference was created. */ -struct upb_mm_ref *upb_mm_getfieldref(struct upb_mm_ref *msgref, - struct upb_fielddef *f, - bool *refcreated); -/* Array len must be < i. */ -struct upb_mm_ref *upb_mm_getelemref(struct upb_mm_ref *arrref, upb_arraylen_t i, - bool *refcreated); - -/* Remove this ref from the list for this msg. - * If that was the last reference, deletes the msg itself. */ -void upb_mm_release(struct upb_mm_ref *ref); - -void upb_mm_msgset(struct upb_mm_ref *msg, struct upb_mm_ref *to, - struct upb_fielddef *f); -void upb_mm_msgclear(struct upb_mm_ref *from, struct upb_fielddef *f); -void upb_mm_msgclear_all(struct upb_mm_ref *from); - -void upb_mm_arrset(struct upb_mm_ref *from, struct upb_mm_ref *to, uint32_t i); - -/* Defined iff upb_field_ismm(f). */ -INLINE upb_mm_ptrtype upb_field_ptrtype(struct upb_fielddef *f); -/* Defined iff upb_elem_ismm(f). */ -INLINE upb_mm_ptrtype upb_elem_ptrtype(struct upb_fielddef *f); - -INLINE void upb_mm_unref(union upb_mmptr p, upb_mm_ptrtype type); - -/* These methods are all a bit silly, since all branches of the case compile - * to the same thing (which the compiler will recognize), but we do it this way - * for full union correctness. */ -INLINE union upb_mmptr upb_mmptr_read(union upb_value_ptr p, upb_mm_ptrtype t) -{ - union upb_mmptr val; - switch(t) { - case UPB_MM_MSG_REF: val.msg = *p.msg; break; - case UPB_MM_STR_REF: val.str = *p.str; break; - case UPB_MM_ARR_REF: val.arr = *p.arr; break; - default: assert(false); val.msg = *p.msg; break; /* Shouldn't happen. */ - } - return val; -} - -INLINE void upb_mmptr_write(union upb_value_ptr p, union upb_mmptr val, - upb_mm_ptrtype t) -{ - switch(t) { - case UPB_MM_MSG_REF: *p.msg = val.msg; break; - case UPB_MM_STR_REF: *p.str = val.str; break; - case UPB_MM_ARR_REF: *p.arr = val.arr; break; - default: assert(false); val.msg = *p.msg; break; /* Shouldn't happen. */ - } -} - -void upb_array_destroy(struct upb_array *arr); -void upb_msg_destroy(struct upb_msg *msg); - -INLINE void upb_msg_unref(struct upb_msg *msg) { - if(upb_mmhead_unref(&msg->mmhead)) upb_msg_destroy(msg); -} - -INLINE void upb_array_unref(struct upb_array *arr) { - if(upb_mmhead_unref(&arr->mmhead)) upb_array_destroy(arr); -} - -INLINE void upb_mm_unref(union upb_mmptr p, upb_mm_ptrtype type) -{ - switch(type) { - case UPB_MM_MSG_REF: upb_msg_unref(p.msg); break; - case UPB_MM_STR_REF: upb_string_unref(p.str); break; - case UPB_MM_ARR_REF: upb_array_unref(p.arr); - } -} - -static struct upb_mmhead *upb_mmhead_addr(union upb_mmptr p, upb_mm_ptrtype t) -{ - switch(t) { - case UPB_MM_MSG_REF: return &((*p.msg).mmhead); - case UPB_MM_STR_REF: return &((*p.str).mmhead); - case UPB_MM_ARR_REF: return &((*p.arr).mmhead); - default: assert(false); return &((*p.msg).mmhead); /* Shouldn't happen. */ - } -} - -INLINE void upb_mm_ref(union upb_mmptr p, upb_mm_ptrtype type) -{ - upb_mmhead_ref(upb_mmhead_addr(p, type)); -} - -#ifdef __cplusplus -} /* extern "C" */ -#endif - -#endif /* UPB_MM_MSG_H_ */ |