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Commit79ca7ff

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A few fixups in error handling: mark pg_re_throw() as noreturn for gcc,
and for other compilers, insert a dummy exit() call so that they understandPG_RE_THROW() doesn't return. Insert fflush(stderr) in ExceptionalCondition,per recent buildfarm evidence that that might not happen automatically on someplatforms. And const-ify ExceptionalCondition's declaration while at it.
1 parentd26559d commit79ca7ff

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4 files changed

+36
-10
lines changed

4 files changed

+36
-10
lines changed

‎src/backend/utils/error/assert.c‎

Lines changed: 10 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/error/assert.c,v 1.33 2007/01/05 22:19:43 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/error/assert.c,v 1.34 2007/05/04 02:01:02 tgl Exp $
1212
*
1313
* NOTE
1414
* This should eventually work with elog()
@@ -21,11 +21,14 @@
2121

2222
/*
2323
* ExceptionalCondition - Handles the failure of an Assert()
24+
*
25+
* Note: this can't actually return, but we declare it as returning int
26+
* because the TrapMacro() macro might get wonky otherwise.
2427
*/
2528
int
26-
ExceptionalCondition(char*conditionName,
27-
char*errorType,
28-
char*fileName,
29+
ExceptionalCondition(constchar*conditionName,
30+
constchar*errorType,
31+
constchar*fileName,
2932
intlineNumber)
3033
{
3134
if (!PointerIsValid(conditionName)
@@ -39,6 +42,9 @@ ExceptionalCondition(char *conditionName,
3942
fileName,lineNumber);
4043
}
4144

45+
/* Usually this shouldn't be needed, but make sure the msg went out */
46+
fflush(stderr);
47+
4248
#ifdefSLEEP_ON_ASSERT
4349

4450
/*

‎src/backend/utils/error/elog.c‎

Lines changed: 11 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -42,7 +42,7 @@
4242
*
4343
*
4444
* IDENTIFICATION
45-
* $PostgreSQL: pgsql/src/backend/utils/error/elog.c,v 1.184 2007/05/02 15:32:41 tgl Exp $
45+
* $PostgreSQL: pgsql/src/backend/utils/error/elog.c,v 1.185 2007/05/04 02:01:02 tgl Exp $
4646
*
4747
*-------------------------------------------------------------------------
4848
*/
@@ -1151,6 +1151,16 @@ pg_re_throw(void)
11511151

11521152
errfinish(0);
11531153
}
1154+
1155+
/* We mustn't return... */
1156+
ExceptionalCondition("pg_re_throw tried to return","FailedAssertion",
1157+
__FILE__,__LINE__);
1158+
1159+
/*
1160+
* Since ExceptionalCondition isn't declared noreturn because of
1161+
* TrapMacro(), we need this to keep gcc from complaining.
1162+
*/
1163+
abort();
11541164
}
11551165

11561166

‎src/include/postgres.h‎

Lines changed: 4 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
1010
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
1111
* Portions Copyright (c) 1995, Regents of the University of California
1212
*
13-
* $PostgreSQL: pgsql/src/include/postgres.h,v 1.79 2007/04/06 04:21:44 tgl Exp $
13+
* $PostgreSQL: pgsql/src/include/postgres.h,v 1.80 2007/05/04 02:01:02 tgl Exp $
1414
*
1515
*-------------------------------------------------------------------------
1616
*/
@@ -694,8 +694,9 @@ extern DLLIMPORT bool assert_enabled;
694694
Trap(!(condition), "BadState")
695695
#endif/* USE_ASSERT_CHECKING */
696696

697-
externintExceptionalCondition(char*conditionName,char*errorType,
698-
char*fileName,intlineNumber);
697+
externintExceptionalCondition(constchar*conditionName,
698+
constchar*errorType,
699+
constchar*fileName,intlineNumber);
699700

700701
/* ----------------------------------------------------------------
701702
*Section 4: genbki macros used by catalog/pg_xxx.h files

‎src/include/utils/elog.h‎

Lines changed: 11 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/include/utils/elog.h,v 1.85 2007/05/02 15:32:42 tgl Exp $
10+
* $PostgreSQL: pgsql/src/include/utils/elog.h,v 1.86 2007/05/04 02:01:02 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -222,8 +222,17 @@ extern DLLIMPORT ErrorContextCallback *error_context_stack;
222222
error_context_stack = save_context_stack; \
223223
} while (0)
224224

225+
/*
226+
* gcc understands __attribute__((noreturn)); for other compilers, insert
227+
* a useless exit() call so that the compiler gets the point.
228+
*/
229+
#ifdef__GNUC__
225230
#definePG_RE_THROW() \
226231
pg_re_throw()
232+
#else
233+
#definePG_RE_THROW() \
234+
(pg_re_throw(), exit(1))
235+
#endif
227236

228237
externDLLIMPORTsigjmp_buf*PG_exception_stack;
229238

@@ -262,7 +271,7 @@ extern ErrorData *CopyErrorData(void);
262271
externvoidFreeErrorData(ErrorData*edata);
263272
externvoidFlushErrorState(void);
264273
externvoidReThrowError(ErrorData*edata);
265-
externvoidpg_re_throw(void);
274+
externvoidpg_re_throw(void) __attribute__((noreturn));
266275

267276

268277
/* GUC-configurable parameters */

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