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fix(lexer): memory leaks

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matteo 2026-01-17 11:38:23 +01:00 • committed by william.valenduc
parent 2c1f210d37
commit acbcb860a4
1 changed files with 75 additions and 64 deletions
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29
src/lexer/lexer.c
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@ -36,16 +36,16 @@ static void update_last_token(struct token *tok)
/* @brief: updates the current position in the stream. /* @brief: updates the current position in the stream.
* [stream] += [i] * [stream] += [i]
* Also saves the last token sent (so we can free it afterwards). * Also frees the last sent token, and sets it to current_token.
* Also sets the current token to NULL. * Current token is then set to NULL.
* This function is called by token_pop(). * This function is called by token_pop().
*/ */
static void save_state(char *stream, ssize_t i, struct token *tok) static void save_state(char *stream, ssize_t i)
{ {
remaining_chars -= i; remaining_chars -= i;
end_last_token = stream + i; end_last_token = stream + i;
update_last_token(tok); update_last_token(current_token);
update_current_token(NULL); update_current_token(NULL);
} }
@ -157,6 +157,10 @@ static void set_token_keyword(struct token *tok, char *begin, ssize_t size)
tok->type = TOKEN_ELIF; tok->type = TOKEN_ELIF;
} }
// no keywords found.
if (tok->type == TOKEN_NULL)
return;
tok->data = calloc(size + 1, sizeof(char)); tok->data = calloc(size + 1, sizeof(char));
if (tok->data == NULL) if (tok->data == NULL)
return; return;
@ -255,9 +259,11 @@ struct token *peek_token(void)
struct token *pop_token(void) struct token *pop_token(void)
{ {
if (last_token != NULL && last_token->type == TOKEN_EOF) if (current_token != NULL && current_token->type == TOKEN_EOF)
{ {
// we reached end of input, frees all the token still allocated.
free_token(&last_token); free_token(&last_token);
free_token(&current_token);
return NULL; return NULL;
} }
char *stream = stream_init(); char *stream = stream_init();
@ -279,8 +285,13 @@ struct token *pop_token(void)
i++; i++;
} }
struct token *tok = new_token(stream, i); // just in case peek() was not called before poping.
save_state(stream, i, tok); // (this should never happen)
if (current_token == NULL)
return tok; {
current_token = new_token(stream, i);
}
save_state(stream, i);
return last_token;
} }