55e1819c50
The QObject hierarchy is small enough, and unlikely to grow further (since we only use it to map to JSON and already cover all JSON types), that we can simplify things by not tracking a separate vtable, but just inline the code element of the vtable QType directly into QObject (renamed to type), and track a separate array of destroy functions. We can drop qnull_destroy_obj() in the process. The remaining QObject subclasses must export their destructor. This also has the nice benefit of moving the typename 'QType' out of the way, so that the next patch can repurpose it for a nicer name for 'qtype_code'. The various objects are still the same size (so no change in cache line pressure), but now have less indirection (although I didn't bother benchmarking to see if there is a noticeable speedup, as we don't have hard evidence that this was in a performance hotspot in the first place). A future patch could drop the refcnt size to 32 bits for a smaller struct on 64-bit architectures, if desired (we have limits on the largest JSON that we are willing to parse, and will probably never need to take full advantage of a 64-bit refcnt). Suggested-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1449033659-25497-2-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/*
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* QDict Module
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* Authors:
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* Luiz Capitulino <lcapitulino@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#ifndef QDICT_H
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#define QDICT_H
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#include "qapi/qmp/qobject.h"
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#include "qapi/qmp/qlist.h"
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#include "qemu/queue.h"
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#include <stdbool.h>
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#include <stdint.h>
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#define QDICT_BUCKET_MAX 512
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typedef struct QDictEntry {
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char *key;
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QObject *value;
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QLIST_ENTRY(QDictEntry) next;
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} QDictEntry;
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typedef struct QDict {
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QObject base;
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size_t size;
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QLIST_HEAD(,QDictEntry) table[QDICT_BUCKET_MAX];
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} QDict;
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/* Object API */
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QDict *qdict_new(void);
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const char *qdict_entry_key(const QDictEntry *entry);
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QObject *qdict_entry_value(const QDictEntry *entry);
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size_t qdict_size(const QDict *qdict);
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void qdict_put_obj(QDict *qdict, const char *key, QObject *value);
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void qdict_del(QDict *qdict, const char *key);
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int qdict_haskey(const QDict *qdict, const char *key);
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QObject *qdict_get(const QDict *qdict, const char *key);
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QDict *qobject_to_qdict(const QObject *obj);
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void qdict_iter(const QDict *qdict,
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void (*iter)(const char *key, QObject *obj, void *opaque),
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void *opaque);
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const QDictEntry *qdict_first(const QDict *qdict);
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const QDictEntry *qdict_next(const QDict *qdict, const QDictEntry *entry);
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void qdict_destroy_obj(QObject *obj);
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/* Helper to qdict_put_obj(), accepts any object */
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#define qdict_put(qdict, key, obj) \
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qdict_put_obj(qdict, key, QOBJECT(obj))
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/* High level helpers */
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double qdict_get_double(const QDict *qdict, const char *key);
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int64_t qdict_get_int(const QDict *qdict, const char *key);
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bool qdict_get_bool(const QDict *qdict, const char *key);
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QList *qdict_get_qlist(const QDict *qdict, const char *key);
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QDict *qdict_get_qdict(const QDict *qdict, const char *key);
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const char *qdict_get_str(const QDict *qdict, const char *key);
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int64_t qdict_get_try_int(const QDict *qdict, const char *key,
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int64_t def_value);
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bool qdict_get_try_bool(const QDict *qdict, const char *key, bool def_value);
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const char *qdict_get_try_str(const QDict *qdict, const char *key);
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void qdict_copy_default(QDict *dst, QDict *src, const char *key);
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void qdict_set_default_str(QDict *dst, const char *key, const char *val);
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QDict *qdict_clone_shallow(const QDict *src);
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void qdict_flatten(QDict *qdict);
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void qdict_extract_subqdict(QDict *src, QDict **dst, const char *start);
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void qdict_array_split(QDict *src, QList **dst);
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int qdict_array_entries(QDict *src, const char *subqdict);
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void qdict_join(QDict *dest, QDict *src, bool overwrite);
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#endif /* QDICT_H */
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