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Commit4cb8246

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Cast result of copyObject() to correct type
copyObject() is declared to return void *, which allows easily assigningthe result independent of the input, but it loses all type checking.If the compiler supports typeof or something similar, cast the result tothe input type. This creates a greater amount of type safety. In somecases, where the result is assigned to a generic type such as Node * orExpr *, new casts are now necessary, but in general casts are nowunnecessary in the normal case and indicate that something unusual ishappening.Reviewed-by: Mark Dilger <hornschnorter@gmail.com>
1 parent66b7643 commit4cb8246

36 files changed

+178
-92
lines changed

‎config/c-compiler.m4‎

Lines changed: 27 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -178,6 +178,33 @@ fi])# PGAC_C_STATIC_ASSERT
178178

179179

180180

181+
# PGAC_C_TYPEOF
182+
# -------------
183+
# Check if the C compiler understands typeof or a variant. Define
184+
# HAVE_TYPEOF if so, and define 'typeof' to the actual key word.
185+
#
186+
AC_DEFUN([PGAC_C_TYPEOF],
187+
[AC_CACHE_CHECK(fortypeof,pgac_cv_c_typeof,
188+
[pgac_cv_c_typeof=no
189+
for pgac_kw in typeof __typeof__ decltype; do
190+
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
191+
[int x = 0;
192+
$pgac_kw(x) y;
193+
y = x;
194+
return y;])],
195+
[pgac_cv_c_typeof=$pgac_kw])
196+
test "$pgac_cv_c_typeof" != no && break
197+
done])
198+
if test "$pgac_cv_c_typeof" != no; then
199+
AC_DEFINE(HAVE_TYPEOF,1,
200+
[Define to 1 if your compiler understands `typeof' or something similar.])
201+
if test "$pgac_cv_c_typeof" != typeof; then
202+
AC_DEFINE(typeof,$pgac_cv_c_typeof,[Define to how the compiler spells `typeof'.])
203+
fi
204+
fi])# PGAC_C_TYPEOF
205+
206+
207+
181208
# PGAC_C_TYPES_COMPATIBLE
182209
# -----------------------
183210
# Check if the C compiler understands __builtin_types_compatible_p,

‎configure‎

Lines changed: 40 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -11667,6 +11667,46 @@ if test x"$pgac_cv__static_assert" = xyes ; then
1166711667

1166811668
$as_echo"#define HAVE__STATIC_ASSERT 1">>confdefs.h
1166911669

11670+
fi
11671+
{$as_echo"$as_me:${as_lineno-$LINENO}: checking for typeof">&5
11672+
$as_echo_n"checking for typeof...">&6; }
11673+
if${pgac_cv_c_typeof+:}false;then:
11674+
$as_echo_n"(cached)">&6
11675+
else
11676+
pgac_cv_c_typeof=no
11677+
forpgac_kwin typeof __typeof__ decltype;do
11678+
cat confdefs.h -<<_ACEOF >conftest.$ac_ext
11679+
/* end confdefs.h. */
11680+
11681+
int
11682+
main ()
11683+
{
11684+
int x = 0;
11685+
$pgac_kw(x) y;
11686+
y = x;
11687+
return y;
11688+
;
11689+
return 0;
11690+
}
11691+
_ACEOF
11692+
if ac_fn_c_try_compile"$LINENO";then:
11693+
pgac_cv_c_typeof=$pgac_kw
11694+
fi
11695+
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
11696+
test"$pgac_cv_c_typeof"!= no&&break
11697+
done
11698+
fi
11699+
{$as_echo"$as_me:${as_lineno-$LINENO}: result:$pgac_cv_c_typeof">&5
11700+
$as_echo"$pgac_cv_c_typeof">&6; }
11701+
iftest"$pgac_cv_c_typeof"!= no;then
11702+
11703+
$as_echo"#define HAVE_TYPEOF 1">>confdefs.h
11704+
11705+
iftest"$pgac_cv_c_typeof"!= typeof;then
11706+
11707+
$as_echo"#define typeof\$pgac_cv_c_typeof">>confdefs.h
11708+
11709+
fi
1167011710
fi
1167111711
{$as_echo"$as_me:${as_lineno-$LINENO}: checking for __builtin_types_compatible_p">&5
1167211712
$as_echo_n"checking for __builtin_types_compatible_p...">&6; }

‎configure.in‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1330,6 +1330,7 @@ AC_C_FLEXIBLE_ARRAY_MEMBER
13301330
PGAC_C_SIGNED
13311331
PGAC_C_FUNCNAME_SUPPORT
13321332
PGAC_C_STATIC_ASSERT
1333+
PGAC_C_TYPEOF
13331334
PGAC_C_TYPES_COMPATIBLE
13341335
PGAC_C_BUILTIN_BSWAP32
13351336
PGAC_C_BUILTIN_BSWAP64

‎src/backend/bootstrap/bootstrap.c‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1082,11 +1082,11 @@ index_register(Oid heap,
10821082

10831083
memcpy(newind->il_info,indexInfo,sizeof(IndexInfo));
10841084
/* expressions will likely be null, but may as well copy it */
1085-
newind->il_info->ii_Expressions= (List*)
1085+
newind->il_info->ii_Expressions=
10861086
copyObject(indexInfo->ii_Expressions);
10871087
newind->il_info->ii_ExpressionsState=NIL;
10881088
/* predicate will likely be null, but may as well copy it */
1089-
newind->il_info->ii_Predicate= (List*)
1089+
newind->il_info->ii_Predicate=
10901090
copyObject(indexInfo->ii_Predicate);
10911091
newind->il_info->ii_PredicateState=NULL;
10921092
/* no exclusion constraints at bootstrap time, so no need to copy */

‎src/backend/commands/copy.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1470,7 +1470,7 @@ BeginCopy(ParseState *pstate,
14701470
* function and is executed repeatedly. (See also the same hack in
14711471
* DECLARE CURSOR and PREPARE.) XXX FIXME someday.
14721472
*/
1473-
rewritten=pg_analyze_and_rewrite((RawStmt*)copyObject(raw_query),
1473+
rewritten=pg_analyze_and_rewrite(copyObject(raw_query),
14741474
pstate->p_sourcetext,NULL,0);
14751475

14761476
/* check that we got back something we can work with */

‎src/backend/commands/createas.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -315,7 +315,7 @@ ExecCreateTableAs(CreateTableAsStmt *stmt, const char *queryString,
315315
* and is executed repeatedly. (See also the same hack in EXPLAIN and
316316
* PREPARE.)
317317
*/
318-
rewritten=QueryRewrite((Query*)copyObject(query));
318+
rewritten=QueryRewrite(copyObject(query));
319319

320320
/* SELECT should never rewrite to more or less than one SELECT query */
321321
if (list_length(rewritten)!=1)

‎src/backend/commands/event_trigger.c‎

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1869,7 +1869,7 @@ EventTriggerCollectAlterOpFam(AlterOpFamilyStmt *stmt, Oid opfamoid,
18691869
OperatorFamilyRelationId,opfamoid);
18701870
command->d.opfam.operators=operators;
18711871
command->d.opfam.procedures=procedures;
1872-
command->parsetree=copyObject(stmt);
1872+
command->parsetree=(Node*)copyObject(stmt);
18731873

18741874
currentEventTriggerState->commandList=
18751875
lappend(currentEventTriggerState->commandList,command);
@@ -1902,7 +1902,7 @@ EventTriggerCollectCreateOpClass(CreateOpClassStmt *stmt, Oid opcoid,
19021902
OperatorClassRelationId,opcoid);
19031903
command->d.createopc.operators=operators;
19041904
command->d.createopc.procedures=procedures;
1905-
command->parsetree=copyObject(stmt);
1905+
command->parsetree=(Node*)copyObject(stmt);
19061906

19071907
currentEventTriggerState->commandList=
19081908
lappend(currentEventTriggerState->commandList,command);
@@ -1937,7 +1937,7 @@ EventTriggerCollectAlterTSConfig(AlterTSConfigurationStmt *stmt, Oid cfgId,
19371937
command->d.atscfg.dictIds=palloc(sizeof(Oid)*ndicts);
19381938
memcpy(command->d.atscfg.dictIds,dictIds,sizeof(Oid)*ndicts);
19391939
command->d.atscfg.ndicts=ndicts;
1940-
command->parsetree=copyObject(stmt);
1940+
command->parsetree=(Node*)copyObject(stmt);
19411941

19421942
currentEventTriggerState->commandList=
19431943
lappend(currentEventTriggerState->commandList,command);
@@ -1967,7 +1967,7 @@ EventTriggerCollectAlterDefPrivs(AlterDefaultPrivilegesStmt *stmt)
19671967
command->type=SCT_AlterDefaultPrivileges;
19681968
command->d.defprivs.objtype=stmt->action->objtype;
19691969
command->in_extension=creating_extension;
1970-
command->parsetree=copyObject(stmt);
1970+
command->parsetree=(Node*)copyObject(stmt);
19711971

19721972
currentEventTriggerState->commandList=
19731973
lappend(currentEventTriggerState->commandList,command);

‎src/backend/commands/prepare.c‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -352,7 +352,7 @@ EvaluateParams(PreparedStatement *pstmt, List *params,
352352
* We have to run parse analysis for the expressions. Since the parser is
353353
* not cool about scribbling on its input, copy first.
354354
*/
355-
params=(List*)copyObject(params);
355+
params=copyObject(params);
356356

357357
pstate=make_parsestate(NULL);
358358
pstate->p_sourcetext=queryString;
@@ -554,7 +554,7 @@ FetchPreparedStatementTargetList(PreparedStatement *stmt)
554554
tlist=CachedPlanGetTargetList(stmt->plansource);
555555

556556
/* Copy into caller's context in case plan gets invalidated */
557-
return(List*)copyObject(tlist);
557+
returncopyObject(tlist);
558558
}
559559

560560
/*

‎src/backend/commands/view.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -373,7 +373,7 @@ UpdateRangeTableOfViewParse(Oid viewOid, Query *viewParse)
373373
* Var node twice. copyObject will expand any multiply-referenced subtree
374374
* into multiple copies.
375375
*/
376-
viewParse=(Query*)copyObject(viewParse);
376+
viewParse=copyObject(viewParse);
377377

378378
/* Create a dummy ParseState for addRangeTableEntryForRelation */
379379
pstate=make_parsestate(NULL);

‎src/backend/nodes/copyfuncs.c‎

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -43,7 +43,7 @@
4343

4444
/* Copy a field that is a pointer to some kind of Node or Node tree */
4545
#defineCOPY_NODE_FIELD(fldname) \
46-
(newnode->fldname =copyObject(from->fldname))
46+
(newnode->fldname =copyObjectImpl(from->fldname))
4747

4848
/* Copy a field that is a pointer to a Bitmapset */
4949
#defineCOPY_BITMAPSET_FIELD(fldname) \
@@ -4507,7 +4507,7 @@ _copyDropSubscriptionStmt(const DropSubscriptionStmt *from)
45074507
*/
45084508
#defineCOPY_NODE_CELL(new,old)\
45094509
(new) = (ListCell *) palloc(sizeof(ListCell));\
4510-
lfirst(new) =copyObject(lfirst(old));
4510+
lfirst(new) =copyObjectImpl(lfirst(old));
45114511

45124512
staticList*
45134513
_copyList(constList*from)
@@ -4610,13 +4610,13 @@ _copyForeignKeyCacheInfo(const ForeignKeyCacheInfo *from)
46104610

46114611

46124612
/*
4613-
* copyObject
4613+
*copyObjectImpl -- implementation ofcopyObject(); see nodes/nodes.h
46144614
*
46154615
* Create a copy of a Node tree or list. This is a "deep" copy: all
46164616
* substructure is copied too, recursively.
46174617
*/
46184618
void*
4619-
copyObject(constvoid*from)
4619+
copyObjectImpl(constvoid*from)
46204620
{
46214621
void*retval;
46224622

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