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My diagnosis above isn't right. The real problem is with the ordering of operations in pp_concat: the left and right operands are both fetched before either is copied. I have a patch that fixes it:
--- pp_hot.c.orig 2005-11-21 16:22:04.000000000 +0000 +++ pp_hot.c 2005-11-21 17:00:57.000000000 +0000 @@ -148,11 +148,14 @@ dPOPTOPssrl; bool lbyte; STRLEN rlen; - const char *rpv = SvPV_const(right, rlen); /* mg_get(right) happe +ns here */ - const bool rbyte = !DO_UTF8(right); + const char *rpv; + bool rbyte; bool rcopied = FALSE; if (TARG == right && right != left) { + /* mg_get(right) may happen here ... */ + rpv = SvPV_const(right, rlen); + rbyte = !DO_UTF8(right); right = sv_2mortal(newSVpvn(rpv, rlen)); rpv = SvPV_const(right, rlen); /* no point setting UTF-8 here + */ rcopied = TRUE; @@ -179,6 +182,11 @@ SvUTF8_off(TARG); } + /* or mg_get(right) may happen here */ + if (!rcopied) { + rpv = SvPV_const(right, rlen); + rbyte = !DO_UTF8(right); + } if (lbyte != rbyte) { if (lbyte) sv_utf8_upgrade_nomg(TARG); --- t/op/tie.t.orig 2005-11-21 16:50:25.000000000 +0000 +++ t/op/tie.t 2005-11-21 16:52:07.000000000 +0000 @@ -578,3 +578,10 @@ print $h,"\n"; EXPECT 3.3 +######## +sub TIESCALAR { bless {} } +sub FETCH { shift()->{i} ++ } +tie $h, "main"; +print $h.$h; +EXPECT +01
Just need to do some testing, then I'll send it to p5p.

Update: I've added tests and fixed a unicode bug that I accidentally reintroduced (as per the updated patch in this node), and submitted the patch.

Second update: the patch was applied (as change #26185), then Rafael noticed a subtle bug and reverted it (as change #26190), then I fixed the bug and the fixed patch was applied as change #26192. Phew!


In reply to Re: tie() weirdness by robin
in thread tie() weirdness by blazar

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