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kconfig: remove unneeded buffer allocation in zconf_initscan() 

In Kconfig, there is a stack to save the lexer state for each inclusion
level.

Currently, it operates as an empty stack, with the 'current_buf' always
pointing to an empty buffer. There is no need to preallocate the buffer.
Change it to a full stack.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2024-01-07 22:19:47 +09:00
parent b401b62175
commit 12e3342fc7
1 changed files with 13 additions and 16 deletions
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29
scripts/kconfig/lexer.l
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@ -391,9 +391,6 @@ void zconf_initscan(const char *name)
exit(1);
}
current_buf = xmalloc(sizeof(*current_buf));
memset(current_buf, 0, sizeof(*current_buf));
current_file = file_lookup(name);
yylineno = 1;
}
@ -403,9 +400,10 @@ void zconf_nextfile(const char *name)
struct file *iter;
struct file *file = file_lookup(name);
struct buffer *buf = xmalloc(sizeof(*buf));
memset(buf, 0, sizeof(*buf));
current_buf->state = YY_CURRENT_BUFFER;
buf->state = YY_CURRENT_BUFFER;
buf->parent = current_buf;
current_buf = buf;
yyin = zconf_fopen(file->name);
if (!yyin) {
fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
@ -413,8 +411,6 @@ void zconf_nextfile(const char *name)
exit(1);
}
yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
buf->parent = current_buf;
current_buf = buf;
current_file->lineno = yylineno;
file->parent = current_file;
@ -441,20 +437,21 @@ void zconf_nextfile(const char *name)
static void zconf_endfile(void)
{
struct buffer *parent;
struct buffer *tmp;
current_file = current_file->parent;
if (current_file)
yylineno = current_file->lineno;
parent = current_buf->parent;
if (parent) {
fclose(yyin);
yy_delete_buffer(YY_CURRENT_BUFFER);
yy_switch_to_buffer(parent->state);
}
free(current_buf);
current_buf = parent;
if (!current_buf)
return;
fclose(yyin);
yy_delete_buffer(YY_CURRENT_BUFFER);
yy_switch_to_buffer(current_buf->state);
tmp = current_buf;
current_buf = current_buf->parent;
free(tmp);
}
int zconf_lineno(void)