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qjson: replace QString in JSONLexer with GString 

JSONLexer only needs a simple resizable buffer.  json-streamer.c
can allocate memory for each token instead of relying on reference
counting of QStrings.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1448300659-23559-2-git-send-email-pbonzini@redhat.com>
[Straightforwardly rebased on my patches, checkpatch made happy]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-11-25 22:23:29 +01:00 committed by Markus Armbruster
parent 6b9606f68e
commit d2ca7c0b0d
4 changed files with 18 additions and 22 deletions
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8
include/qapi/qmp/json-lexer.h
View File

@ -14,8 +14,7 @@
#ifndef QEMU_JSON_LEXER_H
#define QEMU_JSON_LEXER_H
#include "qapi/qmp/qstring.h"
#include "qapi/qmp/qlist.h"
#include "glib-compat.h"
typedef enum json_token_type {
JSON_MIN = 100,
@ -36,13 +35,14 @@ typedef enum json_token_type {
typedef struct JSONLexer JSONLexer;
typedef void (JSONLexerEmitter)(JSONLexer *, QString *, JSONTokenType, int x, int y);
typedef void (JSONLexerEmitter)(JSONLexer *, GString *,
JSONTokenType, int x, int y);
struct JSONLexer
{
JSONLexerEmitter *emit;
int state;
QString *token;
GString *token;
int x, y;
};

1
include/qapi/qmp/json-streamer.h
View File

@ -14,6 +14,7 @@
#ifndef QEMU_JSON_STREAMER_H
#define QEMU_JSON_STREAMER_H
#include <stdint.h>
#include "qapi/qmp/qlist.h"
#include "qapi/qmp/json-lexer.h"

22
qobject/json-lexer.c
View File

@ -11,12 +11,9 @@
*
*/
#include "qapi/qmp/qstring.h"
#include "qapi/qmp/qlist.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qint.h"
#include "qemu-common.h"
#include "qapi/qmp/json-lexer.h"
#include <stdint.h>
#define MAX_TOKEN_SIZE (64ULL << 20)
@ -276,7 +273,7 @@ void json_lexer_init(JSONLexer *lexer, JSONLexerEmitter func)
{
lexer->emit = func;
lexer->state = IN_START;
lexer->token = qstring_new();
lexer->token = g_string_sized_new(3);
lexer->x = lexer->y = 0;
}
@ -295,7 +292,7 @@ static int json_lexer_feed_char(JSONLexer *lexer, char ch, bool flush)
new_state = json_lexer[lexer->state][(uint8_t)ch];
char_consumed = !TERMINAL_NEEDED_LOOKAHEAD(lexer->state, new_state);
if (char_consumed) {
qstring_append_chr(lexer->token, ch);
g_string_append_c(lexer->token, ch);
}
switch (new_state) {
@ -313,8 +310,7 @@ static int json_lexer_feed_char(JSONLexer *lexer, char ch, bool flush)
lexer->emit(lexer, lexer->token, new_state, lexer->x, lexer->y);
/* fall through */
case JSON_SKIP:
QDECREF(lexer->token);
lexer->token = qstring_new();
g_string_truncate(lexer->token, 0);
new_state = IN_START;
break;
case IN_ERROR:
@ -332,8 +328,7 @@ static int json_lexer_feed_char(JSONLexer *lexer, char ch, bool flush)
* induce an error/flush state.
*/
lexer->emit(lexer, lexer->token, JSON_ERROR, lexer->x, lexer->y);
QDECREF(lexer->token);
lexer->token = qstring_new();
g_string_truncate(lexer->token, 0);
new_state = IN_START;
lexer->state = new_state;
return 0;
@ -346,10 +341,9 @@ static int json_lexer_feed_char(JSONLexer *lexer, char ch, bool flush)
/* Do not let a single token grow to an arbitrarily large size,
* this is a security consideration.
*/
if (lexer->token->length > MAX_TOKEN_SIZE) {
if (lexer->token->len > MAX_TOKEN_SIZE) {
lexer->emit(lexer, lexer->token, lexer->state, lexer->x, lexer->y);
QDECREF(lexer->token);
lexer->token = qstring_new();
g_string_truncate(lexer->token, 0);
lexer->state = IN_START;
}
@ -379,5 +373,5 @@ int json_lexer_flush(JSONLexer *lexer)
void json_lexer_destroy(JSONLexer *lexer)
{
QDECREF(lexer->token);
g_string_free(lexer->token, true);
}

9
qobject/json-streamer.c
View File

@ -12,6 +12,7 @@
*/
#include "qapi/qmp/qlist.h"
#include "qapi/qmp/qstring.h"
#include "qapi/qmp/qint.h"
#include "qapi/qmp/qdict.h"
#include "qemu-common.h"
@ -21,7 +22,8 @@
#define MAX_TOKEN_SIZE (64ULL << 20)
#define MAX_NESTING (1ULL << 10)
static void json_message_process_token(JSONLexer *lexer, QString *token, JSONTokenType type, int x, int y)
static void json_message_process_token(JSONLexer *lexer, GString *input,
JSONTokenType type, int x, int y)
{
JSONMessageParser *parser = container_of(lexer, JSONMessageParser, lexer);
QDict *dict;
@ -45,12 +47,11 @@ static void json_message_process_token(JSONLexer *lexer, QString *token, JSONTok
dict = qdict_new();
qdict_put(dict, "type", qint_from_int(type));
QINCREF(token);
qdict_put(dict, "token", token);
qdict_put(dict, "token", qstring_from_str(input->str));
qdict_put(dict, "x", qint_from_int(x));
qdict_put(dict, "y", qint_from_int(y));
parser->token_size += token->length;
parser->token_size += input->len;
qlist_append(parser->tokens, dict);