#include "perl.h"
#include "feature.h"
-#define RUN_PP_CATCHABLY(thispp) \
- STMT_START { if (CATCH_GET) return docatch(thispp); } STMT_END
-
#define dopopto_cursub() \
(PL_curstackinfo->si_cxsubix >= 0 \
? PL_curstackinfo->si_cxsubix \
PP(pp_regcomp)
{
dSP;
- PMOP *pm = (PMOP*)cLOGOP->op_other;
+ PMOP *pm = cPMOPx(cLOGOP->op_other);
SV **args;
int nargs;
REGEXP *re = NULL;
{
dSP;
PERL_CONTEXT *cx = CX_CUR();
- PMOP * const pm = (PMOP*) cLOGOP->op_other;
+ PMOP * const pm = cPMOPx(cLOGOP->op_other);
SV * const dstr = cx->sb_dstr;
char *s = cx->sb_s;
char *m = cx->sb_m;
source = (U8 *)f;
f += to_copy;
trans = '~';
- item_is_utf8 = targ_is_utf8 ? !!DO_UTF8(formsv) : !!SvUTF8(formsv);
+ item_is_utf8 = (targ_is_utf8)
+ ? cBOOL(DO_UTF8(formsv))
+ : cBOOL(SvUTF8(formsv));
goto append;
case FF_SKIP: /* skip <arg> chars in format */
break;
}
else {
+ if (size == fieldsize)
+ break;
if (strchr(PL_chopset, *s)) {
/* provisional split point */
/* for a non-space split char, we include
* the split char; hence the '+1' */
chophere = s + 1;
- itemsize = size;
+ itemsize = size + 1;
}
- if (size == fieldsize)
- break;
if (!isCNTRL(*s))
gotsome = TRUE;
}
PUTBACK;
if (PL_op->op_type == OP_MAPSTART)
Perl_pp_pushmark(aTHX); /* push top */
- return ((LOGOP*)PL_op->op_next)->op_other;
+ return cLOGOPx(PL_op->op_next)->op_other;
}
/* pp_grepwhile() lives in pp_hot.c */
dSP;
if (GIMME_V == G_LIST) {
- RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
+ RETURNOP(cLOGOPx(cUNOP->op_first)->op_other);
}
else {
dTOPss;
else {
sv_setiv(targ, 0);
SP--;
- RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
+ RETURNOP(cLOGOPx(cUNOP->op_first)->op_other);
}
}
SvPVCLEAR(TARG);
}
if (flop) {
- sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
+ sv_setiv(PAD_SV(cUNOPx(cUNOP->op_first)->op_first->op_targ), 0);
sv_catpvs(targ, "E0");
}
SETs(targ);
return i;
}
+/*
+=for apidoc_section $callback
+=for apidoc dowantarray
+
+Implements the deprecated L<perlapi/C<GIMME>>.
+=cut
+*/
U8
Perl_dowantarray(pTHX)
return gimme;
}
+/*
+=for apidoc is_lvalue_sub
+
+Returns non-zero if the sub calling this function is being called in an lvalue
+context. Returns 0 otherwise.
+
+=cut
+*/
I32
Perl_is_lvalue_sub(pTHX)
sv_catsv(PL_errors, err);
else
Perl_warn(aTHX_ "%" SVf, SVfARG(err));
- if (PL_parser)
+
+ if (PL_parser) {
+ STRLEN len;
+ char *err_pv = SvPV(err,len);
++PL_parser->error_count;
+ if (memBEGINs(err_pv,len,"syntax error"))
+ {
+ PL_parser->error_count |= PERL_PARSE_IS_SYNTAX_ERROR_FLAG;
+ }
+ }
}
else (void)POPs;
}
- cx = caller_cx(count + !!(PL_op->op_private & OPpOFFBYONE), &dbcx);
+ cx = caller_cx(count + cBOOL(PL_op->op_private & OPpOFFBYONE), &dbcx);
if (!cx) {
if (gimme != G_LIST) {
EXTEND(SP, 1);
mPUSHi(CopHINTS_get(cx->blk_oldcop));
{
SV * mask ;
- STRLEN * const old_warnings = cx->blk_oldcop->cop_warnings ;
+ char *old_warnings = cx->blk_oldcop->cop_warnings;
if (old_warnings == pWARN_NONE)
mask = newSVpvn(WARN_NONEstring, WARNsize) ;
mask = newSVpvn(WARN_ALLstring, WARNsize) ;
}
else
- mask = newSVpvn((char *) (old_warnings + 1), old_warnings[0]);
+ mask = newSVpvn(old_warnings, RCPV_LEN(old_warnings));
mPUSHs(mask);
}
PERL_CONTEXT *cx;
CV *cv = MUTABLE_CV(SvRV(sv));
AV *arg = GvAV(PL_defgv);
+ CV *old_cv = NULL;
while (!CvROOT(cv) && !CvXSUB(cv)) {
const GV * const gv = CvGV(cv);
if (CxTYPE(cx) == CXt_SUB) {
CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth;
- SvREFCNT_dec_NN(cx->blk_sub.cv);
+ /*on XS calls defer freeing the old CV as it could
+ * prematurely set PL_op to NULL, which could cause
+ * e..g XS subs using GIMME_V to SEGV */
+ if (CvISXSUB(cv))
+ old_cv = cx->blk_sub.cv;
+ else
+ SvREFCNT_dec_NN(cx->blk_sub.cv);
}
/* Now do some callish stuff. */
const SSize_t items = arg ? AvFILL(arg) + 1 : 0;
const bool m = arg ? cBOOL(SvRMAGICAL(arg)) : 0;
SV** mark;
+ UNOP fake_goto_op;
ENTER;
SAVETMPS;
SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
+ if (old_cv)
+ SAVEFREESV(old_cv); /* ditto, deferred freeing of old CV */
/* put GvAV(defgv) back onto stack */
if (items) {
PL_comppad = cx->blk_sub.prevcomppad;
PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL;
+ /* Make a temporary a copy of the current GOTO op on the C
+ * stack, but with a modified gimme (we can't modify the
+ * real GOTO op as that's not thread-safe). This allows XS
+ * users of GIMME_V to get the correct calling context,
+ * even though there is no longer a CXt_SUB frame to
+ * provide that information.
+ */
+ Copy(PL_op, &fake_goto_op, 1, UNOP);
+ fake_goto_op.op_flags =
+ (fake_goto_op.op_flags & ~OPf_WANT)
+ | (cx->blk_gimme & G_WANT);
+ PL_op = (OP*)&fake_goto_op;
+
/* XS subs don't have a CXt_SUB, so pop it;
* this is a cx_popblock(), less all the stuff we already did
* for cx_topblock() earlier */
/*
=for apidoc docatch
-Check for the cases 0 or 3 of cur_env.je_ret, only used inside an eval context.
+Interpose, for the current op and RUNOPS loop,
+
+ - a new JMPENV stack catch frame, and
+ - an inner RUNOPS loop to run all the remaining ops following the
+ current PL_op.
+
+Then handle any exceptions raised while in that loop.
+For a caught eval at this level, re-enter the loop with the specified
+restart op (i.e. the op following the OP_LEAVETRY etc); otherwise re-throw
+the exception.
-0 is used as continue inside eval,
+docatch() is intended to be used like this:
-3 is used for a die caught by an inner eval - continue inner loop
+ PP(pp_entertry)
+ {
+ if (CATCH_GET)
+ return docatch(Perl_pp_entertry);
+
+ ... rest of function ...
+ return PL_op->op_next;
+ }
-See F<cop.h>: je_mustcatch, when set at any runlevel to TRUE, means eval ops must
-establish a local jmpenv to handle exception traps.
+If a new catch frame isn't needed, the op behaves normally. Otherwise it
+calls docatch(), which recursively calls pp_entertry(), this time with
+CATCH_GET() false, so the rest of the body of the entertry is run. Then
+docatch() calls CALLRUNOPS() which executes all the ops following the
+entertry. When the loop finally finishes, control returns to docatch(),
+which pops the JMPENV and returns to the parent pp_entertry(), which
+itself immediately returns. Note that *all* subsequent ops are run within
+the inner RUNOPS loop, not just the body of the eval. For example, in
+
+ sub TIEARRAY { eval {1}; my $x }
+ tie @a, "main";
+
+at the point the 'my' is executed, the C stack will look something like:
+
+ #10 main()
+ #9 perl_run() # JMPENV_PUSH level 1 here
+ #8 S_run_body()
+ #7 Perl_runops_standard() # main RUNOPS loop
+ #6 Perl_pp_tie()
+ #5 Perl_call_sv()
+ #4 Perl_runops_standard() # unguarded RUNOPS loop: no new JMPENV
+ #3 Perl_pp_entertry()
+ #2 S_docatch() # JMPENV_PUSH level 2 here
+ #1 Perl_runops_standard() # docatch()'s RUNOPs loop
+ #0 Perl_pp_padsv()
+
+Basically, any section of the perl core which starts a RUNOPS loop may
+make a promise that it will catch any exceptions and restart the loop if
+necessary. If it's not prepared to do that (like call_sv() isn't), then
+it sets CATCH_GET() to true, so that any later eval-like code knows to
+set up a new handler and loop (via docatch()).
+
+See L<perlinterp/"Exception handing"> for further details.
=cut
*/
+
STATIC OP *
S_docatch(pTHX_ Perl_ppaddr_t firstpp)
{
OP * const oldop = PL_op;
dJMPENV;
- assert(CATCH_GET == TRUE);
-
+ assert(CATCH_GET);
JMPENV_PUSH(ret);
+ assert(!CATCH_GET);
+
switch (ret) {
- case 0:
+ case 0: /* normal flow-of-control return from JMPENV_PUSH */
+
+ /* re-run the current op, this time executing the full body of the
+ * pp function */
PL_op = firstpp(aTHX);
redo_body:
- CALLRUNOPS(aTHX);
+ if (PL_op) {
+ CALLRUNOPS(aTHX);
+ }
break;
- case 3:
- /* die caught by an inner eval - continue inner loop */
- if (PL_restartop && PL_restartjmpenv == PL_top_env) {
+
+ case 3: /* an exception raised within an eval */
+ if (PL_restartjmpenv == PL_top_env) {
+ /* die caught by an inner eval - continue inner loop */
+
+ if (!PL_restartop)
+ break;
PL_restartjmpenv = NULL;
PL_op = PL_restartop;
PL_restartop = 0;
goto redo_body;
}
/* FALLTHROUGH */
+
default:
JMPENV_POP;
PL_op = oldop;
- JMPENV_JUMP(ret);
+ JMPENV_JUMP(ret); /* re-throw the exception */
NOT_REACHED; /* NOTREACHED */
}
JMPENV_POP;
}
-/* Run yyparse() in a setjmp wrapper. Returns:
+/* S_try_yyparse():
+ *
+ * Run yyparse() in a setjmp wrapper. Returns:
* 0: yyparse() successful
* 1: yyparse() failed
* 3: yyparse() died
+ *
+ * This is used to trap Perl_croak() calls that are executed
+ * during the compilation process and before the code has been
+ * completely compiled. It is expected to be called from
+ * doeval_compile() only. The parameter 'caller_op' is
+ * only used in DEBUGGING to validate the logic is working
+ * correctly.
+ *
+ * See also try_run_unitcheck().
+ *
*/
STATIC int
-S_try_yyparse(pTHX_ int gramtype)
+S_try_yyparse(pTHX_ int gramtype, OP *caller_op)
{
- int ret;
+ /* if we die during compilation PL_restartop and PL_restartjmpenv
+ * will be set by Perl_die_unwind(). We need to restore their values
+ * if that happens as they are intended for the case where the code
+ * compiles and dies during execution, not where it dies during
+ * compilation. PL_restartop and caller_op->op_next should be the
+ * same anyway, and when compilation fails then caller_op->op_next is
+ * used as the next op after the compile.
+ */
+ JMPENV *restartjmpenv = PL_restartjmpenv;
+ OP *restartop = PL_restartop;
dJMPENV;
+ int ret;
+ PERL_UNUSED_ARG(caller_op); /* only used in debugging builds */
assert(CxTYPE(CX_CUR()) == CXt_EVAL);
JMPENV_PUSH(ret);
ret = yyparse(gramtype) ? 1 : 0;
break;
case 3:
+ /* yyparse() died and we trapped the error. We need to restore
+ * the old PL_restartjmpenv and PL_restartop values. */
+ assert(PL_restartop == caller_op->op_next); /* we expect these to match */
+ PL_restartjmpenv = restartjmpenv;
+ PL_restartop = restartop;
break;
default:
JMPENV_POP;
return ret;
}
+/* S_try_run_unitcheck()
+ *
+ * Run PL_unitcheckav in a setjmp wrapper via call_list.
+ * Returns:
+ * 0: unitcheck blocks ran without error
+ * 3: a unitcheck block died
+ *
+ * This is used to trap Perl_croak() calls that are executed
+ * during UNITCHECK blocks executed after the compilation
+ * process has completed but before the code itself has been
+ * executed via the normal run loops. It is expected to be called
+ * from doeval_compile() only. The parameter 'caller_op' is
+ * only used in DEBUGGING to validate the logic is working
+ * correctly.
+ *
+ * See also try_yyparse().
+ */
+STATIC int
+S_try_run_unitcheck(pTHX_ OP* caller_op)
+{
+ /* if we die during compilation PL_restartop and PL_restartjmpenv
+ * will be set by Perl_die_unwind(). We need to restore their values
+ * if that happens as they are intended for the case where the code
+ * compiles and dies during execution, not where it dies during
+ * compilation. UNITCHECK runs after compilation completes, and
+ * if it dies we will execute the PL_restartop anyway via the
+ * failed compilation code path. PL_restartop and caller_op->op_next
+ * should be the same anyway, and when compilation fails then
+ * caller_op->op_next is used as the next op after the compile.
+ */
+ JMPENV *restartjmpenv = PL_restartjmpenv;
+ OP *restartop = PL_restartop;
+ dJMPENV;
+ int ret;
+ PERL_UNUSED_ARG(caller_op); /* only used in debugging builds */
+
+ assert(CxTYPE(CX_CUR()) == CXt_EVAL);
+ JMPENV_PUSH(ret);
+ switch (ret) {
+ case 0:
+ call_list(PL_scopestack_ix, PL_unitcheckav);
+ break;
+ case 3:
+ /* call_list died */
+ /* call_list() died and we trapped the error. We should restore
+ * the old PL_restartjmpenv and PL_restartop values, as they are
+ * used only in the case where the code was actually run.
+ * The assert validates that we will still execute the PL_restartop.
+ */
+ assert(PL_restartop == caller_op->op_next); /* we expect these to match */
+ PL_restartjmpenv = restartjmpenv;
+ PL_restartop = restartop;
+ break;
+ default:
+ JMPENV_POP;
+ JMPENV_JUMP(ret);
+ NOT_REACHED; /* NOTREACHED */
+ }
+ JMPENV_POP;
+ return ret;
+}
/* Compile a require/do or an eval ''.
*
CALL_BLOCK_HOOKS(bhk_eval, saveop);
- /* note that yyparse() may raise an exception, e.g. C<BEGIN{die}>,
- * so honour CATCH_GET and trap it here if necessary */
+ /* we should never be CATCH_GET true here, as our immediate callers should
+ * always handle that case. */
+ assert(!CATCH_GET);
+ /* compile the code */
- /* compile the code */
- yystatus = (!in_require && CATCH_GET) ? S_try_yyparse(aTHX_ GRAMPROG) : yyparse(GRAMPROG);
+ yystatus = (!in_require)
+ ? S_try_yyparse(aTHX_ GRAMPROG, saveop)
+ : yyparse(GRAMPROG);
if (yystatus || PL_parser->error_count || !PL_eval_root) {
PERL_CONTEXT *cx;
SV *errsv;
PL_op = saveop;
- /* note that if yystatus == 3, then the require/eval died during
- * compilation, so the EVAL CX block has already been popped, and
- * various vars restored */
if (yystatus != 3) {
+ /* note that if yystatus == 3, then the require/eval died during
+ * compilation, so the EVAL CX block has already been popped, and
+ * various vars restored. This block applies similar steps after
+ * the other "failed to compile" cases in yyparse, eg, where
+ * yystatus=1, "failed, but did not die". */
if (PL_eval_root) {
op_free(PL_eval_root);
PL_eval_root = NULL;
}
}
- if (PL_unitcheckav) {
+ if (PL_unitcheckav && av_count(PL_unitcheckav)>0) {
OP *es = PL_eval_start;
- call_list(PL_scopestack_ix, PL_unitcheckav);
+ /* TODO: are we sure we shouldn't do S_try_run_unitcheck()
+ * when `in_require` is true? */
+ if (in_require) {
+ call_list(PL_scopestack_ix, PL_unitcheckav);
+ }
+ else if (S_try_run_unitcheck(aTHX_ saveop)) {
+ /* there was an error! */
+
+ /* Restore PL_OP */
+ PL_op = saveop;
+
+ SV *errsv = ERRSV;
+ if (!*(SvPV_nolen_const(errsv))) {
+ /* This happens when using:
+ * eval qq# UNITCHECK { die "\x00"; } #;
+ */
+ sv_setpvs(errsv, "Unit check error");
+ }
+
+ if (gimme != G_LIST) PUSHs(&PL_sv_undef);
+ PUTBACK;
+ return FALSE;
+ }
PL_eval_start = es;
}
/*XXX OPf_KIDS should always be true? -dapm 4/2017 */
if (PL_op->op_flags & OPf_KIDS) {
- SVOP * const kid = (SVOP*)cUNOP->op_first;
+ SVOP * const kid = cSVOPx(cUNOP->op_first);
if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
/* Make sure that a bareword module name (e.g. ::Foo::Bar)
PP(pp_require)
{
- RUN_PP_CATCHABLY(Perl_pp_require);
+ /* If a suitable JMPENV catch frame isn't present, call docatch(),
+ * which will:
+ * - add such a frame, and
+ * - start a new RUNOPS loop, which will (as the first op to run),
+ * recursively call this pp function again.
+ * The main body of this function is then executed by the inner call.
+ */
+ if (CATCH_GET)
+ return docatch(Perl_pp_require);
{
dSP;
bool bytes;
I32 old_savestack_ix;
- RUN_PP_CATCHABLY(Perl_pp_entereval);
+ /* If a suitable JMPENV catch frame isn't present, call docatch(),
+ * which will:
+ * - add such a frame, and
+ * - start a new RUNOPS loop, which will (as the first op to run),
+ * recursively call this pp function again.
+ * The main body of this function is then executed by the inner call.
+ */
+ if (CATCH_GET)
+ return docatch(Perl_pp_entereval);
+
+ assert(!CATCH_GET);
gimme = GIMME_V;
was = PL_breakable_sub_gen;
if (PERLDB_NAMEEVAL && CopLINE(PL_curcop)) {
SV * const temp_sv = sv_newmortal();
- Perl_sv_setpvf(aTHX_ temp_sv, "_<(eval %lu)[%s:%" IVdf "]",
+ Perl_sv_setpvf(aTHX_ temp_sv, "_<(eval %lu)[%s:%" LINE_Tf "]",
(unsigned long)++PL_evalseq,
- CopFILE(PL_curcop), (IV)CopLINE(PL_curcop));
+ CopFILE(PL_curcop), CopLINE(PL_curcop));
tmpbuf = SvPVX(temp_sv);
len = SvCUR(temp_sv);
}
PERL_CONTEXT *cx;
OP *retop;
int failed;
+ bool override_return = FALSE; /* is feature 'module_true' in effect? */
CV *evalcv;
bool keep;
oldsp = PL_stack_base + cx->blk_oldsp;
gimme = cx->blk_gimme;
- /* did require return a false value? */
- failed = CxOLD_OP_TYPE(cx) == OP_REQUIRE
+ bool is_require= CxOLD_OP_TYPE(cx) == OP_REQUIRE;
+ if (is_require) {
+ /* We are in an require. Check if use feature 'module_true' is enabled,
+ * and if so later on correct any returns from the require. */
+
+ /* we might be called for an OP_LEAVEEVAL or OP_RETURN opcode
+ * and the parse tree will look different for either case.
+ * so find the right op to check later */
+ if (OP_TYPE_IS_OR_WAS(PL_op, OP_RETURN)) {
+ if (PL_op->op_flags & OPf_SPECIAL)
+ override_return = true;
+ }
+ else if ((PL_op->op_flags & OPf_KIDS) && OP_TYPE_IS_OR_WAS(PL_op, OP_LEAVEEVAL)){
+ COP *old_pl_curcop = PL_curcop;
+ OP *check = cUNOPx(PL_op)->op_first;
+
+ /* ok, we found something to check, we need to scan through
+ * it and find the last OP_NEXTSTATE it contains and then read the
+ * feature state out of the COP data it contains.
+ */
+ if (check) {
+ if (!OP_TYPE_IS(check,OP_STUB)) {
+ const OP *kid = cLISTOPx(check)->op_first;
+ const OP *last_state = NULL;
+
+ for (; kid; kid = OpSIBLING(kid)) {
+ if (
+ OP_TYPE_IS_OR_WAS(kid, OP_NEXTSTATE)
+ || OP_TYPE_IS_OR_WAS(kid, OP_DBSTATE)
+ ){
+ last_state = kid;
+ }
+ }
+ if (last_state) {
+ PL_curcop = cCOPx(last_state);
+ if (FEATURE_MODULE_TRUE_IS_ENABLED) {
+ override_return = TRUE;
+ }
+ } else {
+ NOT_REACHED; /* NOTREACHED */
+ }
+ }
+ } else {
+ NOT_REACHED; /* NOTREACHED */
+ }
+ PL_curcop = old_pl_curcop;
+ }
+ }
+
+ /* we might override this later if 'module_true' is enabled */
+ failed = is_require
&& !(gimme == G_SCALAR
? SvTRUE_NN(*PL_stack_sp)
: PL_stack_sp > oldsp);
#endif
CvDEPTH(evalcv) = 0;
+ if (override_return) {
+ /* make sure that we use a standard return when feature 'module_load'
+ * is enabled. Returns from require are problematic (consider what happens
+ * when it is called twice) */
+ if (gimme == G_SCALAR) {
+ /* this following is an optimization of POPs()/PUSHs().
+ * and does the same thing with less bookkeeping */
+ *PL_stack_sp = &PL_sv_yes;
+ }
+ assert(gimme == G_VOID || gimme == G_SCALAR);
+ failed = 0;
+ }
+
/* pop the CXt_EVAL, and if a require failed, croak */
S_pop_eval_context_maybe_croak(aTHX_ cx, NULL, failed);
PERL_CONTEXT *cx;
const U8 gimme = GIMME_V;
- RUN_PP_CATCHABLY(Perl_pp_entertrycatch);
+ /* If a suitable JMPENV catch frame isn't present, call docatch(),
+ * which will:
+ * - add such a frame, and
+ * - start a new RUNOPS loop, which will (as the first op to run),
+ * recursively call this pp function again.
+ * The main body of this function is then executed by the inner call.
+ */
+ if (CATCH_GET)
+ return docatch(Perl_pp_entertrycatch);
assert(!CATCH_GET);
{
OP *retop = cLOGOP->op_other->op_next;
- RUN_PP_CATCHABLY(Perl_pp_entertry);
+ /* If a suitable JMPENV catch frame isn't present, call docatch(),
+ * which will:
+ * - add such a frame, and
+ * - start a new RUNOPS loop, which will (as the first op to run),
+ * recursively call this pp function again.
+ * The main body of this function is then executed by the inner call.
+ */
+ if (CATCH_GET)
+ return docatch(Perl_pp_entertry);
assert(!CATCH_GET);
STATIC PMOP *
S_make_matcher(pTHX_ REGEXP *re)
{
- PMOP *matcher = (PMOP *) newPMOP(OP_MATCH, OPf_WANT_SCALAR | OPf_STACKED);
+ PMOP *matcher = cPMOPx(newPMOP(OP_MATCH, OPf_WANT_SCALAR | OPf_STACKED));
PERL_ARGS_ASSERT_MAKE_MATCHER;
if (mg) {
/* still the same as previously-compiled string? */
SV *old = mg->mg_obj;
- if ( !(!!SvUTF8(old) ^ !!SvUTF8(sv))
- && len == SvCUR(old)
- && strnEQ(SvPVX(old), s, len)
+ if ( ! (cBOOL(SvUTF8(old)) ^ cBOOL(SvUTF8(sv)))
+ && len == SvCUR(old)
+ && strnEQ(SvPVX(old), s, len)
) {
DEBUG_f(PerlIO_printf(Perl_debug_log,"Re-using compiled format\n"));
return mg;
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