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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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24
src/backend/tcop/postgres.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.261 2002/04/18 20:01:09 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.262 2002/04/20 21:56:15 petere Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -120,7 +120,7 @@ int XfuncMode = 0;
static int InteractiveBackend(StringInfo inBuf);
static int SocketBackend(StringInfo inBuf);
static int ReadCommand(StringInfo inBuf);
static List *pg_parse_query(char *query_string, Oid *typev, int nargs);
static List *pg_parse_query(StringInfo query_string, Oid *typev, int nargs);
static List *pg_analyze_and_rewrite(Node *parsetree);
static void start_xact_command(void);
static void finish_xact_command(void);
@ -330,11 +330,15 @@ pg_parse_and_rewrite(char *query_string, /* string to execute */
List *raw_parsetree_list;
List *querytree_list;
List *list_item;
StringInfoData stri;
initStringInfo(&stri);
appendStringInfo(&stri, "%s", query_string);
/*
* (1) parse the request string into a list of raw parse trees.
*/
raw_parsetree_list = pg_parse_query(query_string, typev, nargs);
raw_parsetree_list = pg_parse_query(&stri, typev, nargs);
/*
* (2) Do parse analysis and rule rewrite.
@ -365,12 +369,12 @@ pg_parse_and_rewrite(char *query_string, /* string to execute */
* commands are not processed any further than the raw parse stage.
*/
static List *
pg_parse_query(char *query_string, Oid *typev, int nargs)
pg_parse_query(StringInfo query_string, Oid *typev, int nargs)
{
List *raw_parsetree_list;
if (Debug_print_query)
elog(LOG, "query: %s", query_string);
elog(LOG, "query: %s", query_string->data);
if (Show_parser_stats)
ResetUsage();
@ -549,7 +553,7 @@ pg_plan_query(Query *querytree)
*/
void
pg_exec_query_string(char *query_string, /* string to execute */
pg_exec_query_string(StringInfo query_string, /* string to execute */
CommandDest dest, /* where results should go */
MemoryContext parse_context) /* context for
* parsetrees */
@ -559,7 +563,7 @@ pg_exec_query_string(char *query_string, /* string to execute */
List *parsetree_list,
*parsetree_item;
debug_query_string = query_string; /* used by pgmonitor */
debug_query_string = query_string->data; /* used by pgmonitor */
/*
* Start up a transaction command. All queries generated by the
@ -725,7 +729,7 @@ pg_exec_query_string(char *query_string, /* string to execute */
* process utility functions (create, destroy, etc..)
*/
if (Debug_print_query)
elog(LOG, "ProcessUtility: %s", query_string);
elog(LOG, "ProcessUtility: %s", query_string->data);
else elog(DEBUG2, "ProcessUtility");
if (querytree->originalQuery)
@ -1688,7 +1692,7 @@ PostgresMain(int argc, char *argv[], const char *username)
if (!IsUnderPostmaster)
{
puts("\nPOSTGRES backend interactive interface ");
puts("$Revision: 1.261 $ $Date: 2002/04/18 20:01:09 $\n");
puts("$Revision: 1.262 $ $Date: 2002/04/20 21:56:15 $\n");
}
/*
@ -1913,7 +1917,7 @@ PostgresMain(int argc, char *argv[], const char *username)
pgstat_report_activity(parser_input->data);
pg_exec_query_string(parser_input->data,
pg_exec_query_string(parser_input,
whereToSendOutput,
QueryContext);