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qjson: replace QString in JSONLexer with GString

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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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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);
}