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Suppress some compiler warnings in recent commits.

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Older versions of gcc tend to throw "variable might be clobbered by
`longjmp' or `vfork'" warnings whenever a variable is assigned in more than
one place and then used after the end of a PG_TRY block.  That's reasonably
easy to work around in execute_extension_script, and the overhead of
unconditionally saving/restoring the GUC variables seems unlikely to be a
serious concern.

Also clean up logic in ATExecValidateConstraint to make it easier to read
and less likely to provoke "variable might be used uninitialized in this
function" warnings.
This commit is contained in:
Tom Lane 2011-02-08 18:12:17 -05:00
parent 0bc0bd07d4
commit 375e5b0a68
2 changed files with 30 additions and 38 deletions
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31
src/backend/commands/extension.c
View File

@ -521,8 +521,8 @@ execute_extension_script(Oid extensionOid, ExtensionControlFile *control,
const char *schemaName, Oid schemaOid)
{
char *filename = get_extension_absolute_path(control->script);
char *save_client_min_messages = NULL,
*save_log_min_messages = NULL,
char *save_client_min_messages,
*save_log_min_messages,
*save_search_path;
StringInfoData pathbuf;
ListCell *lc;
@ -535,23 +535,19 @@ execute_extension_script(Oid extensionOid, ExtensionControlFile *control,
* We use the equivalent of SET LOCAL to ensure the setting is undone
* upon error.
*/
save_client_min_messages =
pstrdup(GetConfigOption("client_min_messages", false));
if (client_min_messages < WARNING)
{
save_client_min_messages =
pstrdup(GetConfigOption("client_min_messages", false));
(void) set_config_option("client_min_messages", "warning",
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_LOCAL, true);
}
save_log_min_messages =
pstrdup(GetConfigOption("log_min_messages", false));
if (log_min_messages < WARNING)
{
save_log_min_messages =
pstrdup(GetConfigOption("log_min_messages", false));
(void) set_config_option("log_min_messages", "warning",
PGC_SUSET, PGC_S_SESSION,
GUC_ACTION_LOCAL, true);
}
/*
* Set up the search path to contain the target schema, then the schemas
@ -631,15 +627,12 @@ execute_extension_script(Oid extensionOid, ExtensionControlFile *control,
(void) set_config_option("search_path", save_search_path,
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_LOCAL, true);
if (save_client_min_messages != NULL)
(void) set_config_option("client_min_messages", save_client_min_messages,
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_LOCAL, true);
if (save_log_min_messages != NULL)
(void) set_config_option("log_min_messages", save_log_min_messages,
PGC_SUSET, PGC_S_SESSION,
GUC_ACTION_LOCAL, true);
(void) set_config_option("client_min_messages", save_client_min_messages,
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_LOCAL, true);
(void) set_config_option("log_min_messages", save_log_min_messages,
PGC_SUSET, PGC_S_SESSION,
GUC_ACTION_LOCAL, true);
}
/*

37
src/backend/commands/tablecmds.c
View File

@ -5612,17 +5612,16 @@ static void
ATExecValidateConstraint(Relation rel, const char *constrName)
{
Relation conrel;
Form_pg_constraint con;
SysScanDesc scan;
ScanKeyData key;
HeapTuple tuple;
Form_pg_constraint con = NULL;
bool found = false;
Oid conid;
conrel = heap_open(ConstraintRelationId, RowExclusiveLock);
/*
* Find and the target constraint
* Find and check the target constraint
*/
ScanKeyInit(&key,
Anum_pg_constraint_conrelid,
@ -5634,17 +5633,23 @@ ATExecValidateConstraint(Relation rel, const char *constrName)
while (HeapTupleIsValid(tuple = systable_getnext(scan)))
{
con = (Form_pg_constraint) GETSTRUCT(tuple);
if (strcmp(NameStr(con->conname), constrName) != 0)
continue;
conid = HeapTupleGetOid(tuple);
found = true;
break;
if (con->contype == CONSTRAINT_FOREIGN &&
strcmp(NameStr(con->conname), constrName) == 0)
{
found = true;
break;
}
}
if (found && con->contype == CONSTRAINT_FOREIGN && !con->convalidated)
if (!found)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("foreign key constraint \"%s\" of relation \"%s\" does not exist",
constrName, RelationGetRelationName(rel))));
if (!con->convalidated)
{
Oid conid = HeapTupleGetOid(tuple);
HeapTuple copyTuple = heap_copytuple(tuple);
Form_pg_constraint copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
Relation refrel;
@ -5671,19 +5676,13 @@ ATExecValidateConstraint(Relation rel, const char *constrName)
simple_heap_update(conrel, &copyTuple->t_self, copyTuple);
CatalogUpdateIndexes(conrel, copyTuple);
heap_freetuple(copyTuple);
heap_close(refrel, NoLock);
}
systable_endscan(scan);
heap_close(conrel, RowExclusiveLock);
if (!found)
{
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("foreign key constraint \"%s\" of relation \"%s\" does not exist",
constrName, RelationGetRelationName(rel))));
}
heap_close(conrel, RowExclusiveLock);
}
/*