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Diffstat (limited to 'scripts/kconfig/lexer.l')
-rw-r--r--scripts/kconfig/lexer.l130
1 files changed, 61 insertions, 69 deletions
diff --git a/scripts/kconfig/lexer.l b/scripts/kconfig/lexer.l
index cc386e443683..89544c3a1a29 100644
--- a/scripts/kconfig/lexer.l
+++ b/scripts/kconfig/lexer.l
@@ -14,16 +14,22 @@
#include <string.h>
#include "lkc.h"
+#include "preprocess.h"
+
#include "parser.tab.h"
#define YY_DECL static int yylex1(void)
#define START_STRSIZE 16
-static struct {
- struct file *file;
- int lineno;
-} current_pos;
+/* The Kconfig file currently being parsed. */
+const char *cur_filename;
+
+/*
+ * The line number of the current statement. This does not match yylineno.
+ * yylineno is used by the lexer, while cur_lineno is used by the parser.
+ */
+int cur_lineno;
static int prev_prev_token = T_EOL;
static int prev_token = T_EOL;
@@ -33,6 +39,9 @@ static int text_size, text_asize;
struct buffer {
struct buffer *parent;
YY_BUFFER_STATE state;
+ int yylineno;
+ const char *filename;
+ int source_lineno;
};
static struct buffer *current_buf;
@@ -77,7 +86,7 @@ static void warn_ignored_character(char chr)
{
fprintf(stderr,
"%s:%d:warning: ignoring unsupported character '%c'\n",
- current_file->name, yylineno, chr);
+ cur_filename, yylineno, chr);
}
%}
@@ -180,7 +189,7 @@ n [A-Za-z0-9_-]
\n {
fprintf(stderr,
"%s:%d:warning: multi-line strings not supported\n",
- zconf_curname(), zconf_lineno());
+ cur_filename, cur_lineno);
unput('\n');
BEGIN(INITIAL);
yylval.string = text;
@@ -246,9 +255,9 @@ n [A-Za-z0-9_-]
if (prev_token != T_EOL && prev_token != T_HELPTEXT)
fprintf(stderr, "%s:%d:warning: no new line at end of file\n",
- current_file->name, yylineno);
+ cur_filename, yylineno);
- if (current_file) {
+ if (current_buf) {
zconf_endfile();
return T_EOL;
}
@@ -267,19 +276,17 @@ repeat:
token = yylex1();
if (prev_token == T_EOL || prev_token == T_HELPTEXT) {
- if (token == T_EOL) {
+ if (token == T_EOL)
/* Do not pass unneeded T_EOL to the parser. */
goto repeat;
- } else {
+ else
/*
- * For the parser, update file/lineno at the first token
+ * For the parser, update lineno at the first token
* of each statement. Generally, \n is a statement
* terminator in Kconfig, but it is not always true
* because \n could be escaped by a backslash.
*/
- current_pos.file = current_file;
- current_pos.lineno = yylineno;
- }
+ cur_lineno = yylineno;
}
if (prev_prev_token == T_EOL && prev_token == T_WORD &&
@@ -302,8 +309,11 @@ static char *expand_token(const char *in, size_t n)
new_string();
append_string(in, n);
- /* get the whole line because we do not know the end of token. */
- while ((c = input()) != EOF) {
+ /*
+ * get the whole line because we do not know the end of token.
+ * input() returns 0 (not EOF!) when it reachs the end of file.
+ */
+ while ((c = input()) != 0) {
if (c == '\n') {
unput(c);
break;
@@ -391,78 +401,60 @@ 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);
+ cur_filename = file_lookup(name);
yylineno = 1;
}
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));
+ bool recur_include = false;
- current_buf->state = YY_CURRENT_BUFFER;
- yyin = zconf_fopen(file->name);
+ buf->state = YY_CURRENT_BUFFER;
+ buf->yylineno = yylineno;
+ buf->filename = cur_filename;
+ buf->source_lineno = cur_lineno;
+ buf->parent = current_buf;
+ current_buf = buf;
+ yyin = zconf_fopen(name);
if (!yyin) {
fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
- zconf_curname(), zconf_lineno(), file->name);
+ cur_filename, cur_lineno, 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;
-
- for (iter = current_file; iter; iter = iter->parent) {
- if (!strcmp(iter->name, file->name)) {
- fprintf(stderr,
- "Recursive inclusion detected.\n"
- "Inclusion path:\n"
- " current file : %s\n", file->name);
- iter = file;
- do {
- iter = iter->parent;
- fprintf(stderr, " included from: %s:%d\n",
- iter->name, iter->lineno - 1);
- } while (strcmp(iter->name, file->name));
- exit(1);
- }
+ for (buf = current_buf; buf; buf = buf->parent) {
+ if (!strcmp(buf->filename, name))
+ recur_include = true;
}
- yylineno = 1;
- current_file = file;
-}
-
-static void zconf_endfile(void)
-{
- struct buffer *parent;
-
- current_file = current_file->parent;
- if (current_file)
- yylineno = current_file->lineno;
+ if (recur_include) {
+ fprintf(stderr,
+ "Recursive inclusion detected.\n"
+ "Inclusion path:\n"
+ " current file : %s\n", name);
- parent = current_buf->parent;
- if (parent) {
- fclose(yyin);
- yy_delete_buffer(YY_CURRENT_BUFFER);
- yy_switch_to_buffer(parent->state);
+ for (buf = current_buf; buf; buf = buf->parent)
+ fprintf(stderr, " included from: %s:%d\n",
+ buf->filename, buf->source_lineno);
+ exit(1);
}
- free(current_buf);
- current_buf = parent;
-}
-int zconf_lineno(void)
-{
- return current_pos.lineno;
+ yylineno = 1;
+ cur_filename = file_lookup(name);
}
-const char *zconf_curname(void)
+static void zconf_endfile(void)
{
- return current_pos.file ? current_pos.file->name : "<none>";
+ struct buffer *tmp;
+
+ fclose(yyin);
+ yy_delete_buffer(YY_CURRENT_BUFFER);
+ yy_switch_to_buffer(current_buf->state);
+ yylineno = current_buf->yylineno;
+ cur_filename = current_buf->filename;
+ tmp = current_buf;
+ current_buf = current_buf->parent;
+ free(tmp);
}