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Commitf1f10a1

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Add declaration-level assertions for compile-time checks
Those new assertions can be used at file scope, outside of any functionfor compilation checks. This commit provides implementations for C andC++, and fallback implementations.Author: Peter SmithReviewed-by: Andres Freund, Kyotaro Horiguchi, Dagfinn Ilmari Mannsåker,Michael PaquierDiscussion:https://postgr.es/m/201DD0641B056142AC8C6645EC1B5F62014B8E8030@SYD1217
1 parent6148e2b commitf1f10a1

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7 files changed

+76
-12
lines changed

7 files changed

+76
-12
lines changed

‎src/backend/storage/page/bufpage.c‎

Lines changed: 1 addition & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -119,14 +119,7 @@ PageIsVerified(Page page, BlockNumber blkno)
119119
return true;
120120
}
121121

122-
/*
123-
* Check all-zeroes case. Luckily BLCKSZ is guaranteed to always be a
124-
* multiple of size_t - and it's much faster to compare memory using the
125-
* native word size.
126-
*/
127-
StaticAssertStmt(BLCKSZ== (BLCKSZ /sizeof(size_t))*sizeof(size_t),
128-
"BLCKSZ has to be a multiple of sizeof(size_t)");
129-
122+
/* Check all-zeroes case */
130123
all_zeroes= true;
131124
pagebytes= (size_t*)page;
132125
for (i=0;i< (BLCKSZ /sizeof(size_t));i++)

‎src/backend/utils/adt/lockfuncs.c‎

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -36,13 +36,19 @@ const char *const LockTagTypeNames[] = {
3636
"advisory"
3737
};
3838

39+
StaticAssertDecl(lengthof(LockTagTypeNames)== (LOCKTAG_ADVISORY+1),
40+
"array length mismatch");
41+
3942
/* This must match enum PredicateLockTargetType (predicate_internals.h) */
4043
staticconstchar*constPredicateLockTagTypeNames[]= {
4144
"relation",
4245
"page",
4346
"tuple"
4447
};
4548

49+
StaticAssertDecl(lengthof(PredicateLockTagTypeNames)== (PREDLOCKTAG_TUPLE+1),
50+
"array length mismatch");
51+
4652
/* Working status for pg_lock_status */
4753
typedefstruct
4854
{

‎src/backend/utils/misc/guc.c‎

Lines changed: 39 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -241,6 +241,9 @@ static const struct config_enum_entry bytea_output_options[] = {
241241
{NULL,0, false}
242242
};
243243

244+
StaticAssertDecl(lengthof(bytea_output_options)== (BYTEA_OUTPUT_HEX+2),
245+
"array length mismatch");
246+
244247
/*
245248
* We have different sets for client and server message level options because
246249
* they sort slightly different (see "log" level), and because "fatal"/"panic"
@@ -286,13 +289,19 @@ static const struct config_enum_entry intervalstyle_options[] = {
286289
{NULL,0, false}
287290
};
288291

292+
StaticAssertDecl(lengthof(intervalstyle_options)== (INTSTYLE_ISO_8601+2),
293+
"array length mismatch");
294+
289295
staticconststructconfig_enum_entrylog_error_verbosity_options[]= {
290296
{"terse",PGERROR_TERSE, false},
291297
{"default",PGERROR_DEFAULT, false},
292298
{"verbose",PGERROR_VERBOSE, false},
293299
{NULL,0, false}
294300
};
295301

302+
StaticAssertDecl(lengthof(log_error_verbosity_options)== (PGERROR_VERBOSE+2),
303+
"array length mismatch");
304+
296305
staticconststructconfig_enum_entrylog_statement_options[]= {
297306
{"none",LOGSTMT_NONE, false},
298307
{"ddl",LOGSTMT_DDL, false},
@@ -301,6 +310,9 @@ static const struct config_enum_entry log_statement_options[] = {
301310
{NULL,0, false}
302311
};
303312

313+
StaticAssertDecl(lengthof(log_statement_options)== (LOGSTMT_ALL+2),
314+
"array length mismatch");
315+
304316
staticconststructconfig_enum_entryisolation_level_options[]= {
305317
{"serializable",XACT_SERIALIZABLE, false},
306318
{"repeatable read",XACT_REPEATABLE_READ, false},
@@ -316,6 +328,9 @@ static const struct config_enum_entry session_replication_role_options[] = {
316328
{NULL,0, false}
317329
};
318330

331+
StaticAssertDecl(lengthof(session_replication_role_options)== (SESSION_REPLICATION_ROLE_LOCAL+2),
332+
"array length mismatch");
333+
319334
staticconststructconfig_enum_entrysyslog_facility_options[]= {
320335
#ifdefHAVE_SYSLOG
321336
{"local0",LOG_LOCAL0, false},
@@ -339,18 +354,27 @@ static const struct config_enum_entry track_function_options[] = {
339354
{NULL,0, false}
340355
};
341356

357+
StaticAssertDecl(lengthof(track_function_options)== (TRACK_FUNC_ALL+2),
358+
"array length mismatch");
359+
342360
staticconststructconfig_enum_entryxmlbinary_options[]= {
343361
{"base64",XMLBINARY_BASE64, false},
344362
{"hex",XMLBINARY_HEX, false},
345363
{NULL,0, false}
346364
};
347365

366+
StaticAssertDecl(lengthof(xmlbinary_options)== (XMLBINARY_HEX+2),
367+
"array length mismatch");
368+
348369
staticconststructconfig_enum_entryxmloption_options[]= {
349370
{"content",XMLOPTION_CONTENT, false},
350371
{"document",XMLOPTION_DOCUMENT, false},
351372
{NULL,0, false}
352373
};
353374

375+
StaticAssertDecl(lengthof(xmloption_options)== (XMLOPTION_CONTENT+2),
376+
"array length mismatch");
377+
354378
/*
355379
* Although only "on", "off", and "safe_encoding" are documented, we
356380
* accept all the likely variants of "on" and "off".
@@ -465,6 +489,9 @@ const struct config_enum_entry ssl_protocol_versions_info[] = {
465489
{NULL,0, false}
466490
};
467491

492+
StaticAssertDecl(lengthof(ssl_protocol_versions_info)== (PG_TLS1_3_VERSION+2),
493+
"array length mismatch");
494+
468495
staticstructconfig_enum_entryshared_memory_options[]= {
469496
#ifndefWIN32
470497
{"sysv",SHMEM_TYPE_SYSV, false},
@@ -615,6 +642,9 @@ const char *const GucContext_Names[] =
615642
/* PGC_USERSET */"user"
616643
};
617644

645+
StaticAssertDecl(lengthof(GucContext_Names)== (PGC_USERSET+1),
646+
"array length mismatch");
647+
618648
/*
619649
* Displayable names for source types (enum GucSource)
620650
*
@@ -638,6 +668,9 @@ const char *const GucSource_Names[] =
638668
/* PGC_S_SESSION */"session"
639669
};
640670

671+
StaticAssertDecl(lengthof(GucSource_Names)== (PGC_S_SESSION+1),
672+
"array length mismatch");
673+
641674
/*
642675
* Displayable names for the groupings defined in enum config_group
643676
*/
@@ -749,6 +782,9 @@ const char *const config_group_names[] =
749782
NULL
750783
};
751784

785+
StaticAssertDecl(lengthof(config_group_names)== (DEVELOPER_OPTIONS+2),
786+
"array length mismatch");
787+
752788
/*
753789
* Displayable names for GUC variable types (enum config_type)
754790
*
@@ -763,6 +799,9 @@ const char *const config_type_names[] =
763799
/* PGC_ENUM */"enum"
764800
};
765801

802+
StaticAssertDecl(lengthof(config_type_names)== (PGC_ENUM+1),
803+
"array length mismatch");
804+
766805
/*
767806
* Unit conversion tables.
768807
*

‎src/bin/pg_dump/pg_dump_sort.c‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -80,6 +80,9 @@ static const int dbObjectTypePriority[] =
8080
38/* DO_SUBSCRIPTION */
8181
};
8282

83+
StaticAssertDecl(lengthof(dbObjectTypePriority)== (DO_SUBSCRIPTION+1),
84+
"array length mismatch");
85+
8386
staticDumpIdpreDataBoundId;
8487
staticDumpIdpostDataBoundId;
8588

‎src/common/relpath.c‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -37,6 +37,9 @@ const char *const forkNames[] = {
3737
"init"/* INIT_FORKNUM */
3838
};
3939

40+
StaticAssertDecl(lengthof(forkNames)== (MAX_FORKNUM+1),
41+
"array length mismatch");
42+
4043
/*
4144
* forkname_to_number - look up fork number by name
4245
*

‎src/include/c.h‎

Lines changed: 14 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -832,8 +832,10 @@ extern void ExceptionalCondition(const char *conditionName,
832832
* throw a compile error using the "errmessage" (a string literal).
833833
*
834834
* gcc 4.6 and up supports _Static_assert(), but there are bizarre syntactic
835-
* placement restrictions. These macros make it safe to use as a statement
836-
* or in an expression, respectively.
835+
* placement restrictions. Macros StaticAssertStmt() and StaticAssertExpr()
836+
* make it safe to use as a statement or in an expression, respectively.
837+
* The macro StaticAssertDecl() is suitable for use at file scope (outside of
838+
* any function).
837839
*
838840
* Otherwise we fall back on a kluge that assumes the compiler will complain
839841
* about a negative width for a struct bit-field. This will not include a
@@ -845,24 +847,32 @@ extern void ExceptionalCondition(const char *conditionName,
845847
do { _Static_assert(condition, errmessage); } while(0)
846848
#defineStaticAssertExpr(condition,errmessage) \
847849
((void) ({ StaticAssertStmt(condition, errmessage); true; }))
850+
#defineStaticAssertDecl(condition,errmessage) \
851+
_Static_assert(condition, errmessage)
848852
#else/* !HAVE__STATIC_ASSERT */
849853
#defineStaticAssertStmt(condition,errmessage) \
850854
((void) sizeof(struct { int static_assert_failure : (condition) ? 1 : -1; }))
851855
#defineStaticAssertExpr(condition,errmessage) \
852856
StaticAssertStmt(condition, errmessage)
857+
#defineStaticAssertDecl(condition,errmessage) \
858+
extern void static_assert_func(int static_assert_failure[(condition) ? 1 : -1])
853859
#endif/* HAVE__STATIC_ASSERT */
854860
#else/* C++ */
855861
#if defined(__cpp_static_assert)&&__cpp_static_assert >=200410
856862
#defineStaticAssertStmt(condition,errmessage) \
857863
static_assert(condition, errmessage)
858864
#defineStaticAssertExpr(condition,errmessage) \
859865
({ static_assert(condition, errmessage); })
860-
#else
866+
#defineStaticAssertDecl(condition,errmessage) \
867+
static_assert(condition, errmessage)
868+
#else/* !__cpp_static_assert */
861869
#defineStaticAssertStmt(condition,errmessage) \
862870
do { struct static_assert_struct { int static_assert_failure : (condition) ? 1 : -1; }; } while(0)
863871
#defineStaticAssertExpr(condition,errmessage) \
864872
((void) ({ StaticAssertStmt(condition, errmessage); }))
865-
#endif
873+
#defineStaticAssertDecl(condition,errmessage) \
874+
extern void static_assert_func(int static_assert_failure[(condition) ? 1 : -1])
875+
#endif/* __cpp_static_assert */
866876
#endif/* C++ */
867877

868878

‎src/include/storage/bufpage.h‎

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -418,6 +418,16 @@ do { \
418418
((overwrite) ? PAI_OVERWRITE : 0) | \
419419
((is_heap) ? PAI_IS_HEAP : 0))
420420

421+
/*
422+
* Check that BLCKSZ is a multiple of sizeof(size_t). In PageIsVerified(),
423+
* it is much faster to check if a page is full of zeroes using the native
424+
* word size. Note that this assertion is kept within a header to make
425+
* sure that StaticAssertDecl() works across various combinations of
426+
* platforms and compilers.
427+
*/
428+
StaticAssertDecl(BLCKSZ== ((BLCKSZ /sizeof(size_t))*sizeof(size_t)),
429+
"BLCKSZ has to be a multiple of sizeof(size_t)");
430+
421431
externvoidPageInit(Pagepage,SizepageSize,SizespecialSize);
422432
externboolPageIsVerified(Pagepage,BlockNumberblkno);
423433
externOffsetNumberPageAddItemExtended(Pagepage,Itemitem,Sizesize,

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