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Scanner performance improvements

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Use flex flags -CF.  Pass the to-be-scanned string around as StringInfo
type, to avoid querying the length repeatedly.  Clean up some code and
remove lex-compatibility cruft.  Escape backslash sequences inline.  Use
flex-provided yy_scan_buffer() function to set up input, rather than using
myinput().
This commit is contained in:
Peter Eisentraut
2002-04-20 21:56:15 +00:00
parent ff4281472a
commit 32c6c99e0b
8 changed files with 144 additions and 155 deletions
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18
src/backend/parser/parser.c
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@ -14,7 +14,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parser.c,v 1.51 2001/11/05 17:46:26 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parser.c,v 1.52 2002/04/20 21:56:14 petere Exp $
*
*-------------------------------------------------------------------------
*/
@ -28,12 +28,6 @@
#include "parser/parse_expr.h"
#if defined(FLEX_SCANNER)
extern void DeleteBuffer(void);
#endif /* FLEX_SCANNER */
char *parseString; /* the char* which holds the string to be
* parsed */
List *parsetree; /* result of parsing is left here */
static int lookahead_token; /* one-token lookahead */
@ -48,24 +42,20 @@ static bool have_lookahead; /* lookahead_token set? */
* Returns a list of raw (un-analyzed) parse trees.
*/
List *
parser(char *str, Oid *typev, int nargs)
parser(StringInfo str, Oid *typev, int nargs)
{
int yyresult;
parseString = str;
parsetree = NIL; /* in case parser forgets to set it */
have_lookahead = false;
scanner_init();
scanner_init(str);
parser_init(typev, nargs);
parse_expr_init();
yyresult = yyparse();
#if defined(FLEX_SCANNER)
DeleteBuffer();
#endif /* FLEX_SCANNER */
scanner_finish();
clearerr(stdin);
if (yyresult) /* error */