The optree builder was looping when constructing the ops

[perl5.git] / op.c

diff --git a/op.c b/op.c
index b695a63..46cc07b 100644 (file)
--- a/op.c
+++ b/op.c
@@ -1,7 +1,7 @@
 /*    op.c
  *
  *    Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- *    2000, 2001, 2002, 2003, by Larry Wall and others
+ *    2000, 2001, 2002, 2003, 2004, by Larry Wall and others
  *
  *    You may distribute under the terms of either the GNU General Public
  *    License or the Artistic License, as specified in the README file.
@@ -1763,13 +1763,11 @@ Perl_scope(pTHX_ OP *o)
     return o;
 }
 
+/* XXX kept for BINCOMPAT only */
 void
 Perl_save_hints(pTHX)
 {
-    SAVEI32(PL_hints);
-    SAVESPTR(GvHV(PL_hintgv));
-    GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv));
-    SAVEFREESV(GvHV(PL_hintgv));
+    Perl_croak(aTHX_ "internal error: obsolete function save_hints() called");
 }
 
 int
@@ -3126,6 +3124,14 @@ Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
            op_free(right);
            return Nullop;
        }
+       /* optimise C<my @x = ()> to C<my @x>, and likewise for hashes */
+       if ((left->op_type == OP_PADAV || left->op_type == OP_PADHV)
+               && right->op_type == OP_STUB
+               && (left->op_private & OPpLVAL_INTRO))
+       {
+           op_free(right);
+           return left;
+       }
        curop = list(force_list(left));
        o = newBINOP(OP_AASSIGN, flags, list(force_list(right)), curop);
        o->op_private = (U8)(0 | (flags >> 8));
@@ -3362,10 +3368,13 @@ S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
            no_bareword_allowed(first);
        else if (ckWARN(WARN_BAREWORD) && (first->op_private & OPpCONST_BARE))
                Perl_warner(aTHX_ packWARN(WARN_BAREWORD), "Bareword found in conditional");
-       if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
+       if ((type == OP_AND &&  SvTRUE(((SVOP*)first)->op_sv)) ||
+           (type == OP_OR  && !SvTRUE(((SVOP*)first)->op_sv)) ||
+           (type == OP_DOR && !SvOK(((SVOP*)first)->op_sv))) {
            op_free(first);
            *firstp = Nullop;
-           other->op_private |= OPpCONST_SHORTCIRCUIT;
+           if (other->op_type == OP_CONST)
+               other->op_private |= OPpCONST_SHORTCIRCUIT;
            return other;
        }
        else {
@@ -3388,7 +3397,8 @@ S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
 
            op_free(other);
            *otherp = Nullop;
-           first->op_private |= OPpCONST_SHORTCIRCUIT;
+           if (first->op_type == OP_CONST)
+               first->op_private |= OPpCONST_SHORTCIRCUIT;
            return first;
        }
     }
@@ -5420,7 +5430,7 @@ Perl_ck_grep(pTHX_ OP *o)
        OP* k;
        o = ck_sort(o);
         kid = cLISTOPo->op_first->op_sibling;
-       for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
+       for (k = cUNOPx(kid)->op_first; k; k = k->op_next) {
            kid = k;
        }
        kid->op_next = (OP*)gwop;
@@ -5593,6 +5603,19 @@ Perl_ck_sassign(pTHX_ OP *o)
            return kid;
        }
     }
+    /* optimise C<my $x = undef> to C<my $x> */
+    if (kid->op_type == OP_UNDEF) {
+       OP *kkid = kid->op_sibling;
+       if (kkid && kkid->op_type == OP_PADSV
+               && (kkid->op_private & OPpLVAL_INTRO))
+       {
+           cLISTOPo->op_first = NULL;
+           kid->op_sibling = NULL;
+           op_free(o);
+           op_free(kid);
+           return kkid;
+       }
+    }
     return o;
 }
 
@@ -6405,7 +6428,7 @@ Perl_peep(pTHX_ register OP *o)
                            o->op_next : o->op_next->op_next;
                IV i;
                if (pop && pop->op_type == OP_CONST &&
-                   (PL_op = pop->op_next) &&
+                   ((PL_op = pop->op_next)) &&
                    pop->op_next->op_type == OP_AELEM &&
                    !(pop->op_next->op_private &
                      (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF|OPpMAYBE_LVSUB)) &&
@@ -6414,6 +6437,8 @@ Perl_peep(pTHX_ register OP *o)
                    i >= 0)
                {
                    GV *gv;
+                   if (cSVOPx(pop)->op_private & OPpCONST_STRICT)
+                       no_bareword_allowed(pop);
                    if (o->op_type == OP_GV)
                        op_null(o->op_next);
                    op_null(pop->op_next);