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Commitdb4f21e

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committed
Redesign interrupt/cancel API for regex engine.
Previously, a PostgreSQL-specific callback checked by the regex enginehad a way to trigger a special error code REG_CANCEL if it detected thatthe next call to CHECK_FOR_INTERRUPTS() would certainly throw viaereport().A later proposed bugfix aims to move some complex logic out of signalhandlers, so that it won't run until the next CHECK_FOR_INTERRUPTS(),which makes the above design impossible unless we splitCHECK_FOR_INTERRUPTS() into two phases, one to run logic and another toereport(). We may develop such a system in the future, but for theregex code it is no longer necessary.An earlier commit moved regex memory management over to ourMemoryContext system. Given that the purpose of the two-phase interruptchecking was to free memory before throwing, something we don't need toworry about anymore, it seems simpler to inject CHECK_FOR_INTERRUPTS()directly into cancelation points, and just let it throw.Since the plan is to keep PostgreSQL-specific concerns separate from themain regex engine code (with a view to bein able to stay in sync withother projects), do this with a new macro INTERRUPT(), customizable inregcustom.h and defaulting to nothing.Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>Discussion:https://postgr.es/m/CA%2BhUKGK3PGKwcKqzoosamn36YW-fsuTdOPPF1i_rtEO%3DnEYKSg%40mail.gmail.com
1 parent6db75ed commitdb4f21e

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13 files changed

+18
-104
lines changed

13 files changed

+18
-104
lines changed

‎src/backend/regex/regc_locale.c‎

Lines changed: 1 addition & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -475,11 +475,7 @@ range(struct vars *v,/* context */
475475
}
476476
addchr(cv,cc);
477477
}
478-
if (CANCEL_REQUESTED(v->re))
479-
{
480-
ERR(REG_CANCEL);
481-
returnNULL;
482-
}
478+
INTERRUPT(v->re);
483479
}
484480

485481
returncv;

‎src/backend/regex/regc_nfa.c‎

Lines changed: 8 additions & 40 deletions
Original file line numberDiff line numberDiff line change
@@ -143,11 +143,7 @@ newstate(struct nfa *nfa)
143143
* compilation, since no code path will go very long without making a new
144144
* state or arc.
145145
*/
146-
if (CANCEL_REQUESTED(nfa->v->re))
147-
{
148-
NERR(REG_CANCEL);
149-
returnNULL;
150-
}
146+
INTERRUPT(nfa->v->re);
151147

152148
/* first, recycle anything that's on the freelist */
153149
if (nfa->freestates!=NULL)
@@ -297,11 +293,7 @@ newarc(struct nfa *nfa,
297293
* compilation, since no code path will go very long without making a new
298294
* state or arc.
299295
*/
300-
if (CANCEL_REQUESTED(nfa->v->re))
301-
{
302-
NERR(REG_CANCEL);
303-
return;
304-
}
296+
INTERRUPT(nfa->v->re);
305297

306298
/* check for duplicate arc, using whichever chain is shorter */
307299
if (from->nouts <=to->nins)
@@ -825,11 +817,7 @@ moveins(struct nfa *nfa,
825817
* Because we bypass newarc() in this code path, we'd better include a
826818
* cancel check.
827819
*/
828-
if (CANCEL_REQUESTED(nfa->v->re))
829-
{
830-
NERR(REG_CANCEL);
831-
return;
832-
}
820+
INTERRUPT(nfa->v->re);
833821

834822
sortins(nfa,oldState);
835823
sortins(nfa,newState);
@@ -929,11 +917,7 @@ copyins(struct nfa *nfa,
929917
* Because we bypass newarc() in this code path, we'd better include a
930918
* cancel check.
931919
*/
932-
if (CANCEL_REQUESTED(nfa->v->re))
933-
{
934-
NERR(REG_CANCEL);
935-
return;
936-
}
920+
INTERRUPT(nfa->v->re);
937921

938922
sortins(nfa,oldState);
939923
sortins(nfa,newState);
@@ -1000,11 +984,7 @@ mergeins(struct nfa *nfa,
1000984
* Because we bypass newarc() in this code path, we'd better include a
1001985
* cancel check.
1002986
*/
1003-
if (CANCEL_REQUESTED(nfa->v->re))
1004-
{
1005-
NERR(REG_CANCEL);
1006-
return;
1007-
}
987+
INTERRUPT(nfa->v->re);
1008988

1009989
/* Sort existing inarcs as well as proposed new ones */
1010990
sortins(nfa,s);
@@ -1125,11 +1105,7 @@ moveouts(struct nfa *nfa,
11251105
* Because we bypass newarc() in this code path, we'd better include a
11261106
* cancel check.
11271107
*/
1128-
if (CANCEL_REQUESTED(nfa->v->re))
1129-
{
1130-
NERR(REG_CANCEL);
1131-
return;
1132-
}
1108+
INTERRUPT(nfa->v->re);
11331109

11341110
sortouts(nfa,oldState);
11351111
sortouts(nfa,newState);
@@ -1226,11 +1202,7 @@ copyouts(struct nfa *nfa,
12261202
* Because we bypass newarc() in this code path, we'd better include a
12271203
* cancel check.
12281204
*/
1229-
if (CANCEL_REQUESTED(nfa->v->re))
1230-
{
1231-
NERR(REG_CANCEL);
1232-
return;
1233-
}
1205+
INTERRUPT(nfa->v->re);
12341206

12351207
sortouts(nfa,oldState);
12361208
sortouts(nfa,newState);
@@ -3282,11 +3254,7 @@ checkmatchall_recurse(struct nfa *nfa, struct state *s, bool **haspaths)
32823254
return false;
32833255

32843256
/* In case the search takes a long time, check for cancel */
3285-
if (CANCEL_REQUESTED(nfa->v->re))
3286-
{
3287-
NERR(REG_CANCEL);
3288-
return false;
3289-
}
3257+
INTERRUPT(nfa->v->re);
32903258

32913259
/* Create a haspath array for this state */
32923260
haspath= (bool*)MALLOC((DUPINF+2)*sizeof(bool));

‎src/backend/regex/regcomp.c‎

Lines changed: 0 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -86,7 +86,6 @@ static intnewlacon(struct vars *v, struct state *begin, struct state *end,
8686
intlatype);
8787
staticvoidfreelacons(structsubre*subs,intn);
8888
staticvoidrfree(regex_t*re);
89-
staticintrcancelrequested(void);
9089
staticintrstacktoodeep(void);
9190

9291
#ifdefREG_DEBUG
@@ -356,7 +355,6 @@ struct vars
356355
/* static function list */
357356
staticconststructfnsfunctions= {
358357
rfree,/* regfree insides */
359-
rcancelrequested,/* check for cancel request */
360358
rstacktoodeep/* check for stack getting dangerously deep */
361359
};
362360

@@ -2468,22 +2466,6 @@ rfree(regex_t *re)
24682466
}
24692467
}
24702468

2471-
/*
2472-
* rcancelrequested - check for external request to cancel regex operation
2473-
*
2474-
* Return nonzero to fail the operation with error code REG_CANCEL,
2475-
* zero to keep going
2476-
*
2477-
* The current implementation is Postgres-specific. If we ever get around
2478-
* to splitting the regex code out as a standalone library, there will need
2479-
* to be some API to let applications define a callback function for this.
2480-
*/
2481-
staticint
2482-
rcancelrequested(void)
2483-
{
2484-
returnInterruptPending&& (QueryCancelPending||ProcDiePending);
2485-
}
2486-
24872469
/*
24882470
* rstacktoodeep - check for stack getting dangerously deep
24892471
*

‎src/backend/regex/rege_dfa.c‎

Lines changed: 1 addition & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -805,11 +805,7 @@ miss(struct vars *v,
805805
* Checking for operation cancel in the inner text search loop seems
806806
* unduly expensive. As a compromise, check during cache misses.
807807
*/
808-
if (CANCEL_REQUESTED(v->re))
809-
{
810-
ERR(REG_CANCEL);
811-
returnNULL;
812-
}
808+
INTERRUPT(v->re);
813809

814810
/*
815811
* What set of states would we end up in after consuming the co character?

‎src/backend/regex/regexec.c‎

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -764,8 +764,7 @@ cdissect(struct vars *v,
764764
MDEBUG(("%d: cdissect %c %ld-%ld\n",t->id,t->op,LOFF(begin),LOFF(end)));
765765

766766
/* handy place to check for operation cancel */
767-
if (CANCEL_REQUESTED(v->re))
768-
returnREG_CANCEL;
767+
INTERRUPT(v->re);
769768
/* ... and stack overrun */
770769
if (STACK_TOO_DEEP(v->re))
771770
returnREG_ETOOBIG;

‎src/backend/utils/adt/jsonpath_gram.y‎

Lines changed: 0 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -553,8 +553,6 @@ makeItemLikeRegex(JsonPathParseItem *expr, JsonPathString *pattern,
553553
{
554554
char errMsg[100];
555555

556-
/* See regexp.c for explanation*/
557-
CHECK_FOR_INTERRUPTS();
558556
pg_regerror(re_result, &re_tmp, errMsg,sizeof(errMsg));
559557
ereturn(escontext,false,
560558
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),

‎src/backend/utils/adt/regexp.c‎

Lines changed: 0 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -218,15 +218,6 @@ RE_compile_and_cache(text *text_re, int cflags, Oid collation)
218218
if (regcomp_result!=REG_OKAY)
219219
{
220220
/* re didn't compile (no need for pg_regfree, if so) */
221-
222-
/*
223-
* Here and in other places in this file, do CHECK_FOR_INTERRUPTS
224-
* before reporting a regex error. This is so that if the regex
225-
* library aborts and returns REG_CANCEL, we don't print an error
226-
* message that implies the regex was invalid.
227-
*/
228-
CHECK_FOR_INTERRUPTS();
229-
230221
pg_regerror(regcomp_result,&re_temp.cre_re,errMsg,sizeof(errMsg));
231222
ereport(ERROR,
232223
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
@@ -308,7 +299,6 @@ RE_wchar_execute(regex_t *re, pg_wchar *data, int data_len,
308299
if (regexec_result!=REG_OKAY&&regexec_result!=REG_NOMATCH)
309300
{
310301
/* re failed??? */
311-
CHECK_FOR_INTERRUPTS();
312302
pg_regerror(regexec_result,re,errMsg,sizeof(errMsg));
313303
ereport(ERROR,
314304
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
@@ -2001,7 +1991,6 @@ regexp_fixed_prefix(text *text_re, bool case_insensitive, Oid collation,
20011991

20021992
default:
20031993
/* re failed??? */
2004-
CHECK_FOR_INTERRUPTS();
20051994
pg_regerror(re_result,re,errMsg,sizeof(errMsg));
20061995
ereport(ERROR,
20071996
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),

‎src/backend/utils/adt/varlena.c‎

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4265,7 +4265,6 @@ replace_text_regexp(text *src_text, text *pattern_text,
42654265
{
42664266
charerrMsg[100];
42674267

4268-
CHECK_FOR_INTERRUPTS();
42694268
pg_regerror(regexec_result,re,errMsg,sizeof(errMsg));
42704269
ereport(ERROR,
42714270
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),

‎src/include/regex/regcustom.h‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -44,14 +44,15 @@
4444

4545
#include"mb/pg_wchar.h"
4646

47-
#include"miscadmin.h"/* needed byrcancelrequested/rstacktoodeep */
47+
#include"miscadmin.h"/* needed bystacktoodeep */
4848

4949

5050
/* overrides for regguts.h definitions, if any */
5151
#defineFUNCPTR(name,args) (*name) args
5252
#defineMALLOC(n)palloc_extended((n), MCXT_ALLOC_NO_OOM)
5353
#defineFREE(p)pfree(VS(p))
5454
#defineREALLOC(p,n)repalloc_extended(VS(p),(n), MCXT_ALLOC_NO_OOM)
55+
#defineINTERRUPT(re)CHECK_FOR_INTERRUPTS()
5556
#defineassert(x)Assert(x)
5657

5758
/* internal character type and related */

‎src/include/regex/regerrs.h‎

Lines changed: 0 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -81,7 +81,3 @@
8181
{
8282
REG_ECOLORS,"REG_ECOLORS","too many colors"
8383
},
84-
85-
{
86-
REG_CANCEL,"REG_CANCEL","operation cancelled"
87-
},

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