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Fix memory leaks in scanners generated by at least Flex 2.5.9 and

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later.  Reported by Paul Eggert in
<http://lists.gnu.org/archive/html/bison-patches/2006-11/msg00014.html>.
* src/flex-scanner.h (yylex_destroy): Define for Flex before 2.5.9.
* src/scan-code.l (translate_action): Don't bother invoking
yy_delete_buffer (YY_CURRENT_BUFFER) before creating the first buffer.
(code_scanner_free): Instead of invoking
yy_delete_buffer (YY_CURRENT_BUFFER) directly, invoke yylex_destroy,
which frees more.
* src/scan-gram.l (gram_scanner_free): Likewise.
* src/scan-skel.l (scan_skel): Likewise.
This commit is contained in:
Joel E. Denny
2006-11-10 05:26:26 +00:00
parent 4502eadc2f
commit 580b892607
5 changed files with 30 additions and 5 deletions
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4
src/scan-code.l
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@@ -380,8 +380,6 @@ translate_action (int sc_context, symbol_list *rule, char const *a, location l)
if (!initialized)
{
obstack_init (&obstack_for_string);
/* The initial buffer, never used. */
yy_delete_buffer (YY_CURRENT_BUFFER);
yy_flex_debug = 0;
initialized = true;
}
@@ -422,5 +420,5 @@ code_scanner_free (void)
{
obstack_free (&obstack_for_string, 0);
/* Reclaim Flex's buffers. */
yy_delete_buffer (YY_CURRENT_BUFFER);
yylex_destroy ();
}