14 files changed, 736 insertions, 0 deletions

diff --git a/src/include/qapi/qmp/dispatch.h b/src/include/qapi/qmp/dispatch.h
new file mode 100644
index 0000000..e389697
--- /dev/null
+++ b/src/include/qapi/qmp/dispatch.h
@@ -0,0 +1,58 @@
+/*
+ * Core Definitions for QAPI/QMP Dispatch
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef QMP_CORE_H
+#define QMP_CORE_H
+
+#include "qapi/qmp/qobject.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/error.h"
+
+typedef void (QmpCommandFunc)(QDict *, QObject **, Error **);
+
+typedef enum QmpCommandType
+{
+    QCT_NORMAL,
+} QmpCommandType;
+
+typedef enum QmpCommandOptions
+{
+    QCO_NO_OPTIONS = 0x0,
+    QCO_NO_SUCCESS_RESP = 0x1,
+} QmpCommandOptions;
+
+typedef struct QmpCommand
+{
+    const char *name;
+    QmpCommandType type;
+    QmpCommandFunc *fn;
+    QmpCommandOptions options;
+    QTAILQ_ENTRY(QmpCommand) node;
+    bool enabled;
+} QmpCommand;
+
+void qmp_register_command(const char *name, QmpCommandFunc *fn,
+                          QmpCommandOptions options);
+QmpCommand *qmp_find_command(const char *name);
+QObject *qmp_dispatch(QObject *request);
+void qmp_disable_command(const char *name);
+void qmp_enable_command(const char *name);
+bool qmp_command_is_enabled(const QmpCommand *cmd);
+const char *qmp_command_name(const QmpCommand *cmd);
+bool qmp_has_success_response(const QmpCommand *cmd);
+QObject *qmp_build_error_object(Error *err);
+typedef void (*qmp_cmd_callback_fn)(QmpCommand *cmd, void *opaque);
+void qmp_for_each_command(qmp_cmd_callback_fn fn, void *opaque);
+
+#endif
+
diff --git a/src/include/qapi/qmp/json-lexer.h b/src/include/qapi/qmp/json-lexer.h
new file mode 100644
index 0000000..cb456d5
--- /dev/null
+++ b/src/include/qapi/qmp/json-lexer.h
@@ -0,0 +1,57 @@
+/*
+ * JSON lexer
+ *
+ * Copyright IBM, Corp. 2009
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef QEMU_JSON_LEXER_H
+#define QEMU_JSON_LEXER_H
+
+#include "glib-compat.h"
+
+typedef enum json_token_type {
+    JSON_MIN = 100,
+    JSON_LCURLY = JSON_MIN,
+    JSON_RCURLY,
+    JSON_LSQUARE,
+    JSON_RSQUARE,
+    JSON_COLON,
+    JSON_COMMA,
+    JSON_INTEGER,
+    JSON_FLOAT,
+    JSON_KEYWORD,
+    JSON_STRING,
+    JSON_ESCAPE,
+    JSON_SKIP,
+    JSON_ERROR,
+} JSONTokenType;
+
+typedef struct JSONLexer JSONLexer;
+
+typedef void (JSONLexerEmitter)(JSONLexer *, GString *,
+                                JSONTokenType, int x, int y);
+
+struct JSONLexer
+{
+    JSONLexerEmitter *emit;
+    int state;
+    GString *token;
+    int x, y;
+};
+
+void json_lexer_init(JSONLexer *lexer, JSONLexerEmitter func);
+
+int json_lexer_feed(JSONLexer *lexer, const char *buffer, size_t size);
+
+int json_lexer_flush(JSONLexer *lexer);
+
+void json_lexer_destroy(JSONLexer *lexer);
+
+#endif
diff --git a/src/include/qapi/qmp/json-parser.h b/src/include/qapi/qmp/json-parser.h
new file mode 100644
index 0000000..fea89f8
--- /dev/null
+++ b/src/include/qapi/qmp/json-parser.h
@@ -0,0 +1,24 @@
+/*
+ * JSON Parser 
+ *
+ * Copyright IBM, Corp. 2009
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef QEMU_JSON_PARSER_H
+#define QEMU_JSON_PARSER_H
+
+#include "qemu-common.h"
+#include "qapi/qmp/qlist.h"
+#include "qapi/error.h"
+
+QObject *json_parser_parse(GQueue *tokens, va_list *ap);
+QObject *json_parser_parse_err(GQueue *tokens, va_list *ap, Error **errp);
+
+#endif
diff --git a/src/include/qapi/qmp/json-streamer.h b/src/include/qapi/qmp/json-streamer.h
new file mode 100644
index 0000000..09b3d3e
--- /dev/null
+++ b/src/include/qapi/qmp/json-streamer.h
@@ -0,0 +1,48 @@
+/*
+ * JSON streaming support
+ *
+ * Copyright IBM, Corp. 2009
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef QEMU_JSON_STREAMER_H
+#define QEMU_JSON_STREAMER_H
+
+#include <stdint.h>
+#include "glib-compat.h"
+#include "qapi/qmp/json-lexer.h"
+
+typedef struct JSONToken {
+    int type;
+    int x;
+    int y;
+    char str[];
+} JSONToken;
+
+typedef struct JSONMessageParser
+{
+    void (*emit)(struct JSONMessageParser *parser, GQueue *tokens);
+    JSONLexer lexer;
+    int brace_count;
+    int bracket_count;
+    GQueue *tokens;
+    uint64_t token_size;
+} JSONMessageParser;
+
+void json_message_parser_init(JSONMessageParser *parser,
+                              void (*func)(JSONMessageParser *, GQueue *));
+
+int json_message_parser_feed(JSONMessageParser *parser,
+                             const char *buffer, size_t size);
+
+int json_message_parser_flush(JSONMessageParser *parser);
+
+void json_message_parser_destroy(JSONMessageParser *parser);
+
+#endif
diff --git a/src/include/qapi/qmp/qbool.h b/src/include/qapi/qmp/qbool.h
new file mode 100644
index 0000000..d9256e4
--- /dev/null
+++ b/src/include/qapi/qmp/qbool.h
@@ -0,0 +1,29 @@
+/*
+ * QBool Module
+ *
+ * Copyright IBM, Corp. 2009
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef QBOOL_H
+#define QBOOL_H
+
+#include <stdbool.h>
+#include "qapi/qmp/qobject.h"
+
+typedef struct QBool {
+    QObject base;
+    bool value;
+} QBool;
+
+QBool *qbool_from_bool(bool value);
+bool qbool_get_bool(const QBool *qb);
+QBool *qobject_to_qbool(const QObject *obj);
+
+#endif /* QBOOL_H */
diff --git a/src/include/qapi/qmp/qdict.h b/src/include/qapi/qmp/qdict.h
new file mode 100644
index 0000000..787c658
--- /dev/null
+++ b/src/include/qapi/qmp/qdict.h
@@ -0,0 +1,80 @@
+/*
+ * QDict Module
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * Authors:
+ *  Luiz Capitulino <lcapitulino@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+
+#ifndef QDICT_H
+#define QDICT_H
+
+#include "qapi/qmp/qobject.h"
+#include "qapi/qmp/qlist.h"
+#include "qemu/queue.h"
+#include <stdbool.h>
+#include <stdint.h>
+
+#define QDICT_BUCKET_MAX 512
+
+typedef struct QDictEntry {
+    char *key;
+    QObject *value;
+    QLIST_ENTRY(QDictEntry) next;
+} QDictEntry;
+
+typedef struct QDict {
+    QObject base;
+    size_t size;
+    QLIST_HEAD(,QDictEntry) table[QDICT_BUCKET_MAX];
+} QDict;
+
+/* Object API */
+QDict *qdict_new(void);
+const char *qdict_entry_key(const QDictEntry *entry);
+QObject *qdict_entry_value(const QDictEntry *entry);
+size_t qdict_size(const QDict *qdict);
+void qdict_put_obj(QDict *qdict, const char *key, QObject *value);
+void qdict_del(QDict *qdict, const char *key);
+int qdict_haskey(const QDict *qdict, const char *key);
+QObject *qdict_get(const QDict *qdict, const char *key);
+QDict *qobject_to_qdict(const QObject *obj);
+void qdict_iter(const QDict *qdict,
+                void (*iter)(const char *key, QObject *obj, void *opaque),
+                void *opaque);
+const QDictEntry *qdict_first(const QDict *qdict);
+const QDictEntry *qdict_next(const QDict *qdict, const QDictEntry *entry);
+
+/* Helper to qdict_put_obj(), accepts any object */
+#define qdict_put(qdict, key, obj) \
+        qdict_put_obj(qdict, key, QOBJECT(obj))
+
+/* High level helpers */
+double qdict_get_double(const QDict *qdict, const char *key);
+int64_t qdict_get_int(const QDict *qdict, const char *key);
+bool qdict_get_bool(const QDict *qdict, const char *key);
+QList *qdict_get_qlist(const QDict *qdict, const char *key);
+QDict *qdict_get_qdict(const QDict *qdict, const char *key);
+const char *qdict_get_str(const QDict *qdict, const char *key);
+int64_t qdict_get_try_int(const QDict *qdict, const char *key,
+                          int64_t def_value);
+bool qdict_get_try_bool(const QDict *qdict, const char *key, bool def_value);
+const char *qdict_get_try_str(const QDict *qdict, const char *key);
+
+void qdict_copy_default(QDict *dst, QDict *src, const char *key);
+void qdict_set_default_str(QDict *dst, const char *key, const char *val);
+
+QDict *qdict_clone_shallow(const QDict *src);
+void qdict_flatten(QDict *qdict);
+
+void qdict_extract_subqdict(QDict *src, QDict **dst, const char *start);
+void qdict_array_split(QDict *src, QList **dst);
+int qdict_array_entries(QDict *src, const char *subqdict);
+
+void qdict_join(QDict *dest, QDict *src, bool overwrite);
+
+#endif /* QDICT_H */
diff --git a/src/include/qapi/qmp/qerror.h b/src/include/qapi/qmp/qerror.h
new file mode 100644
index 0000000..f601499
--- /dev/null
+++ b/src/include/qapi/qmp/qerror.h
@@ -0,0 +1,112 @@
+/*
+ * QError Module
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * Authors:
+ *  Luiz Capitulino <lcapitulino@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+#ifndef QERROR_H
+#define QERROR_H
+
+/*
+ * These macros will go away, please don't use in new code, and do not
+ * add new ones!
+ */
+#define QERR_BASE_NOT_FOUND \
+    "Base '%s' not found"
+
+#define QERR_BLOCK_JOB_NOT_READY \
+    "The active block job for device '%s' cannot be completed"
+
+#define QERR_BUS_NO_HOTPLUG \
+    "Bus '%s' does not support hotplugging"
+
+#define QERR_DEVICE_HAS_NO_MEDIUM \
+    "Device '%s' has no medium"
+
+#define QERR_DEVICE_INIT_FAILED \
+    "Device '%s' could not be initialized"
+
+#define QERR_DEVICE_IN_USE \
+    "Device '%s' is in use"
+
+#define QERR_DEVICE_NO_HOTPLUG \
+    "Device '%s' does not support hotplugging"
+
+#define QERR_FD_NOT_FOUND \
+    "File descriptor named '%s' not found"
+
+#define QERR_FD_NOT_SUPPLIED \
+    "No file descriptor supplied via SCM_RIGHTS"
+
+#define QERR_FEATURE_DISABLED \
+    "The feature '%s' is not enabled"
+
+#define QERR_INVALID_BLOCK_FORMAT \
+    "Invalid block format '%s'"
+
+#define QERR_INVALID_PARAMETER \
+    "Invalid parameter '%s'"
+
+#define QERR_INVALID_PARAMETER_TYPE \
+    "Invalid parameter type for '%s', expected: %s"
+
+#define QERR_INVALID_PARAMETER_VALUE \
+    "Parameter '%s' expects %s"
+
+#define QERR_INVALID_PASSWORD \
+    "Password incorrect"
+
+#define QERR_IO_ERROR \
+    "An IO error has occurred"
+
+#define QERR_JSON_PARSING \
+    "Invalid JSON syntax"
+
+#define QERR_MIGRATION_ACTIVE \
+    "There's a migration process in progress"
+
+#define QERR_MISSING_PARAMETER \
+    "Parameter '%s' is missing"
+
+#define QERR_PERMISSION_DENIED \
+    "Insufficient permission to perform this operation"
+
+#define QERR_PROPERTY_VALUE_BAD \
+    "Property '%s.%s' doesn't take value '%s'"
+
+#define QERR_PROPERTY_VALUE_OUT_OF_RANGE \
+    "Property %s.%s doesn't take value %" PRId64 " (minimum: %" PRId64 ", maximum: %" PRId64 ")"
+
+#define QERR_QGA_COMMAND_FAILED \
+    "Guest agent command failed, error was '%s'"
+
+#define QERR_QMP_BAD_INPUT_OBJECT \
+    "Expected '%s' in QMP input"
+
+#define QERR_QMP_BAD_INPUT_OBJECT_MEMBER \
+    "QMP input object member '%s' expects '%s'"
+
+#define QERR_QMP_EXTRA_MEMBER \
+    "QMP input object member '%s' is unexpected"
+
+#define QERR_SET_PASSWD_FAILED \
+    "Could not set password"
+
+#define QERR_UNDEFINED_ERROR \
+    "An undefined error has occurred"
+
+#define QERR_UNKNOWN_BLOCK_FORMAT_FEATURE \
+    "'%s' uses a %s feature which is not supported by this qemu version: %s"
+
+#define QERR_UNSUPPORTED \
+    "this feature or command is not currently supported"
+
+#define QERR_REPLAY_NOT_SUPPORTED \
+    "Record/replay feature is not supported for '%s'"
+
+#endif /* QERROR_H */
diff --git a/src/include/qapi/qmp/qfloat.h b/src/include/qapi/qmp/qfloat.h
new file mode 100644
index 0000000..46745e5
--- /dev/null
+++ b/src/include/qapi/qmp/qfloat.h
@@ -0,0 +1,29 @@
+/*
+ * QFloat Module
+ *
+ * Copyright IBM, Corp. 2009
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef QFLOAT_H
+#define QFLOAT_H
+
+#include <stdint.h>
+#include "qapi/qmp/qobject.h"
+
+typedef struct QFloat {
+    QObject base;
+    double value;
+} QFloat;
+
+QFloat *qfloat_from_double(double value);
+double qfloat_get_double(const QFloat *qi);
+QFloat *qobject_to_qfloat(const QObject *obj);
+
+#endif /* QFLOAT_H */
diff --git a/src/include/qapi/qmp/qint.h b/src/include/qapi/qmp/qint.h
new file mode 100644
index 0000000..339a9ab
--- /dev/null
+++ b/src/include/qapi/qmp/qint.h
@@ -0,0 +1,28 @@
+/*
+ * QInt Module
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * Authors:
+ *  Luiz Capitulino <lcapitulino@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+
+#ifndef QINT_H
+#define QINT_H
+
+#include <stdint.h>
+#include "qapi/qmp/qobject.h"
+
+typedef struct QInt {
+    QObject base;
+    int64_t value;
+} QInt;
+
+QInt *qint_from_int(int64_t value);
+int64_t qint_get_int(const QInt *qi);
+QInt *qobject_to_qint(const QObject *obj);
+
+#endif /* QINT_H */
diff --git a/src/include/qapi/qmp/qjson.h b/src/include/qapi/qmp/qjson.h
new file mode 100644
index 0000000..ee4d31a
--- /dev/null
+++ b/src/include/qapi/qmp/qjson.h
@@ -0,0 +1,29 @@
+/*
+ * QObject JSON integration
+ *
+ * Copyright IBM, Corp. 2009
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef QJSON_H
+#define QJSON_H
+
+#include <stdarg.h>
+#include "qemu/compiler.h"
+#include "qapi/qmp/qobject.h"
+#include "qapi/qmp/qstring.h"
+
+QObject *qobject_from_json(const char *string);
+QObject *qobject_from_jsonf(const char *string, ...) GCC_FMT_ATTR(1, 2);
+QObject *qobject_from_jsonv(const char *string, va_list *ap) GCC_FMT_ATTR(1, 0);
+
+QString *qobject_to_json(const QObject *obj);
+QString *qobject_to_json_pretty(const QObject *obj);
+
+#endif /* QJSON_H */
diff --git a/src/include/qapi/qmp/qlist.h b/src/include/qapi/qmp/qlist.h
new file mode 100644
index 0000000..b1bf785
--- /dev/null
+++ b/src/include/qapi/qmp/qlist.h
@@ -0,0 +1,63 @@
+/*
+ * QList Module
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * Authors:
+ *  Luiz Capitulino <lcapitulino@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+
+#ifndef QLIST_H
+#define QLIST_H
+
+#include "qapi/qmp/qobject.h"
+#include "qemu/queue.h"
+
+typedef struct QListEntry {
+    QObject *value;
+    QTAILQ_ENTRY(QListEntry) next;
+} QListEntry;
+
+typedef struct QList {
+    QObject base;
+    QTAILQ_HEAD(,QListEntry) head;
+} QList;
+
+#define qlist_append(qlist, obj) \
+        qlist_append_obj(qlist, QOBJECT(obj))
+
+#define QLIST_FOREACH_ENTRY(qlist, var)             \
+        for ((var) = ((qlist)->head.tqh_first);     \
+            (var);                                  \
+            (var) = ((var)->next.tqe_next))
+
+static inline QObject *qlist_entry_obj(const QListEntry *entry)
+{
+    return entry->value;
+}
+
+QList *qlist_new(void);
+QList *qlist_copy(QList *src);
+void qlist_append_obj(QList *qlist, QObject *obj);
+void qlist_iter(const QList *qlist,
+                void (*iter)(QObject *obj, void *opaque), void *opaque);
+QObject *qlist_pop(QList *qlist);
+QObject *qlist_peek(QList *qlist);
+int qlist_empty(const QList *qlist);
+size_t qlist_size(const QList *qlist);
+QList *qobject_to_qlist(const QObject *obj);
+
+static inline const QListEntry *qlist_first(const QList *qlist)
+{
+    return QTAILQ_FIRST(&qlist->head);
+}
+
+static inline const QListEntry *qlist_next(const QListEntry *entry)
+{
+    return QTAILQ_NEXT(entry, next);
+}
+
+#endif /* QLIST_H */
diff --git a/src/include/qapi/qmp/qobject.h b/src/include/qapi/qmp/qobject.h
new file mode 100644
index 0000000..4b96ed5
--- /dev/null
+++ b/src/include/qapi/qmp/qobject.h
@@ -0,0 +1,118 @@
+/*
+ * QEMU Object Model.
+ *
+ * Based on ideas by Avi Kivity <avi@redhat.com>
+ *
+ * Copyright (C) 2009, 2015 Red Hat Inc.
+ *
+ * Authors:
+ *  Luiz Capitulino <lcapitulino@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ * QObject Reference Counts Terminology
+ * ------------------------------------
+ *
+ *  - Returning references: A function that returns an object may
+ *  return it as either a weak or a strong reference.  If the reference
+ *  is strong, you are responsible for calling QDECREF() on the reference
+ *  when you are done.
+ *
+ *  If the reference is weak, the owner of the reference may free it at
+ *  any time in the future.  Before storing the reference anywhere, you
+ *  should call QINCREF() to make the reference strong.
+ *
+ *  - Transferring ownership: when you transfer ownership of a reference
+ *  by calling a function, you are no longer responsible for calling
+ *  QDECREF() when the reference is no longer needed.  In other words,
+ *  when the function returns you must behave as if the reference to the
+ *  passed object was weak.
+ */
+#ifndef QOBJECT_H
+#define QOBJECT_H
+
+#include <stddef.h>
+#include <assert.h>
+
+typedef enum {
+    QTYPE_NONE,    /* sentinel value, no QObject has this type code */
+    QTYPE_QNULL,
+    QTYPE_QINT,
+    QTYPE_QSTRING,
+    QTYPE_QDICT,
+    QTYPE_QLIST,
+    QTYPE_QFLOAT,
+    QTYPE_QBOOL,
+    QTYPE_MAX,
+} qtype_code;
+
+struct QObject;
+
+typedef struct QType {
+    qtype_code code;
+    void (*destroy)(struct QObject *);
+} QType;
+
+typedef struct QObject {
+    const QType *type;
+    size_t refcnt;
+} QObject;
+
+/* Get the 'base' part of an object */
+#define QOBJECT(obj) (&(obj)->base)
+
+/* High-level interface for qobject_incref() */
+#define QINCREF(obj)      \
+    qobject_incref(QOBJECT(obj))
+
+/* High-level interface for qobject_decref() */
+#define QDECREF(obj)              \
+    qobject_decref(obj ? QOBJECT(obj) : NULL)
+
+/* Initialize an object to default values */
+#define QOBJECT_INIT(obj, qtype_type)   \
+    obj->base.refcnt = 1;               \
+    obj->base.type   = qtype_type
+
+/**
+ * qobject_incref(): Increment QObject's reference count
+ */
+static inline void qobject_incref(QObject *obj)
+{
+    if (obj)
+        obj->refcnt++;
+}
+
+/**
+ * qobject_decref(): Decrement QObject's reference count, deallocate
+ * when it reaches zero
+ */
+static inline void qobject_decref(QObject *obj)
+{
+    assert(!obj || obj->refcnt);
+    if (obj && --obj->refcnt == 0) {
+        assert(obj->type != NULL);
+        assert(obj->type->destroy != NULL);
+        obj->type->destroy(obj);
+    }
+}
+
+/**
+ * qobject_type(): Return the QObject's type
+ */
+static inline qtype_code qobject_type(const QObject *obj)
+{
+    assert(obj->type != NULL);
+    return obj->type->code;
+}
+
+extern QObject qnull_;
+
+static inline QObject *qnull(void)
+{
+    qobject_incref(&qnull_);
+    return &qnull_;
+}
+
+#endif /* QOBJECT_H */
diff --git a/src/include/qapi/qmp/qstring.h b/src/include/qapi/qmp/qstring.h
new file mode 100644
index 0000000..34675a7
--- /dev/null
+++ b/src/include/qapi/qmp/qstring.h
@@ -0,0 +1,36 @@
+/*
+ * QString Module
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * Authors:
+ *  Luiz Capitulino <lcapitulino@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+
+#ifndef QSTRING_H
+#define QSTRING_H
+
+#include <stdint.h>
+#include "qapi/qmp/qobject.h"
+
+typedef struct QString {
+    QObject base;
+    char *string;
+    size_t length;
+    size_t capacity;
+} QString;
+
+QString *qstring_new(void);
+QString *qstring_from_str(const char *str);
+QString *qstring_from_substr(const char *str, int start, int end);
+size_t qstring_get_length(const QString *qstring);
+const char *qstring_get_str(const QString *qstring);
+void qstring_append_int(QString *qstring, int64_t value);
+void qstring_append(QString *qstring, const char *str);
+void qstring_append_chr(QString *qstring, int c);
+QString *qobject_to_qstring(const QObject *obj);
+
+#endif /* QSTRING_H */
diff --git a/src/include/qapi/qmp/types.h b/src/include/qapi/qmp/types.h
new file mode 100644
index 0000000..7782ec5
--- /dev/null
+++ b/src/include/qapi/qmp/types.h
@@ -0,0 +1,25 @@
+/*
+ * Include all QEMU objects.
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * Authors:
+ *  Luiz Capitulino <lcapitulino@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+
+#ifndef QEMU_OBJECTS_H
+#define QEMU_OBJECTS_H
+
+#include "qapi/qmp/qobject.h"
+#include "qapi/qmp/qint.h"
+#include "qapi/qmp/qfloat.h"
+#include "qapi/qmp/qbool.h"
+#include "qapi/qmp/qstring.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qlist.h"
+#include "qapi/qmp/qjson.h"
+
+#endif /* QEMU_OBJECTS_H */