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Prevent memory leaks in our various bison parsers when an error occurs

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during parsing.  Formerly the parser's stack was allocated with malloc
and so wouldn't be reclaimed; this patch makes it use palloc instead,
so that flushing the current context will reclaim the memory.  Per
Marko Kreen.
This commit is contained in:
Tom Lane
2008-09-02 20:37:55 +00:00
parent dd6edd5efd
commit fbb2b69c8f
5 changed files with 60 additions and 4 deletions
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13
contrib/cube/cubeparse.y
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@ -2,7 +2,7 @@
/* NdBox = [(lowerleft),(upperright)] */
/* [(xLL(1)...xLL(N)),(xUR(1)...xUR(n))] */
/* $PostgreSQL: pgsql/contrib/cube/cubeparse.y,v 1.17 2007/02/27 23:48:05 tgl Exp $ */
/* $PostgreSQL: pgsql/contrib/cube/cubeparse.y,v 1.18 2008/09/02 20:37:54 tgl Exp $ */
#define YYPARSE_PARAM result /* need this to pass a pointer (void *) to yyparse */
#define YYSTYPE char *
@ -12,6 +12,17 @@
#include "cubedata.h"
/*
* Bison doesn't allocate anything that needs to live across parser calls,
* so we can easily have it use palloc instead of malloc. This prevents
* memory leaks if we error out during parsing. Note this only works with
* bison >= 2.0. However, in bison 1.875 the default is to use alloca()
* if possible, so there's not really much problem anyhow, at least if
* you're building with gcc.
*/
#define YYMALLOC palloc
#define YYFREE pfree
extern int cube_yylex(void);
static char *scanbuf;