Integrate pureperl changes #8844,8845,8850 to mainline

(via maintperl #8855).

Fixed %^H scoping bug

Removed GV <-> CV refcount loop

Removed %ENV refcount loop

p4raw-link: @8850 on //depot/maint-5.6/pureperl: bae1eca58b94313e4b7677aa241da9fad57bb363
p4raw-link: @8845 on //depot/maint-5.6/pureperl: 4d40626c12bbdd62acfbbe3be104711e58cec2f7
p4raw-link: @8844 on //depot/maint-5.6/pureperl: ea100fc6cfd2f0e23aceb84ac0e804e3c9c3c9a2

p4raw-id: //depot/perl@8858
p4raw-integrated: from //depot/maint-5.6/perl@8857 'merge in' gv.c
	scope.c (@8606..) pp.c (@8635..) op.c (@8758..) perl.c
	(@8806..)

5 files changed, 7 insertions, 12 deletions

diff --git a/gv.c b/gv.c
index 4d51811600..0d34366e4f 100644
--- a/gv.c
+++ b/gv.c
@@ -125,7 +125,7 @@ Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
 	LEAVE;
 
 	PL_sub_generation++;
-	CvGV(GvCV(gv)) = (GV*)SvREFCNT_inc(gv);
+	CvGV(GvCV(gv)) = gv;
 	CvFILE(GvCV(gv)) = CopFILE(PL_curcop);
 	CvSTASH(GvCV(gv)) = PL_curstash;
 #ifdef USE_THREADS
diff --git a/op.c b/op.c
index edafe0299f..af7221e2c9 100644
--- a/op.c
+++ b/op.c
@@ -4155,7 +4155,6 @@ Perl_cv_undef(pTHX_ CV *cv)
     }
     SvPOK_off((SV*)cv);		/* forget prototype */
     CvFLAGS(cv) = 0;
-    SvREFCNT_dec(CvGV(cv));
     CvGV(cv) = Nullgv;
     SvREFCNT_dec(CvOUTSIDE(cv));
     CvOUTSIDE(cv) = Nullcv;
@@ -4268,7 +4267,7 @@ S_cv_clone2(pTHX_ CV *proto, CV *outside)
     CvOWNER(cv)		= 0;
 #endif /* USE_THREADS */
     CvFILE(cv)		= CvFILE(proto);
-    CvGV(cv)		= (GV*)SvREFCNT_inc(CvGV(proto));
+    CvGV(cv)		= CvGV(proto);
     CvSTASH(cv)		= CvSTASH(proto);
     CvROOT(cv)		= CvROOT(proto);
     CvSTART(cv)		= CvSTART(proto);
@@ -4678,7 +4677,7 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
 	    PL_sub_generation++;
 	}
     }
-    CvGV(cv) = (GV*)SvREFCNT_inc(gv);
+    CvGV(cv) = gv;
     CvFILE(cv) = CopFILE(PL_curcop);
     CvSTASH(cv) = PL_curstash;
 #ifdef USE_THREADS
@@ -4954,7 +4953,7 @@ Perl_newXS(pTHX_ char *name, XSUBADDR_t subaddr, char *filename)
 	    PL_sub_generation++;
 	}
     }
-    CvGV(cv) = (GV*)SvREFCNT_inc(gv);
+    CvGV(cv) = gv;
 #ifdef USE_THREADS
     New(666, CvMUTEXP(cv), 1, perl_mutex);
     MUTEX_INIT(CvMUTEXP(cv));
@@ -5045,7 +5044,7 @@ Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
     }
     cv = PL_compcv;
     GvFORM(gv) = cv;
-    CvGV(cv) = (GV*)SvREFCNT_inc(gv);
+    CvGV(cv) = gv;
     CvFILE(cv) = CopFILE(PL_curcop);
 
     for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
diff --git a/perl.c b/perl.c
index 7dc4902502..a2538fe5c6 100644
--- a/perl.c
+++ b/perl.c
@@ -3326,7 +3326,7 @@ S_init_postdump_symbols(pTHX_ register int argc, register char **argv, register
 	HV *hv;
 	GvMULTI_on(PL_envgv);
 	hv = GvHVn(PL_envgv);
-	hv_magic(hv, PL_envgv, 'E');
+	hv_magic(hv, Nullgv, 'E');
 #ifdef USE_ENVIRON_ARRAY
 	/* Note that if the supplied env parameter is actually a copy
 	   of the global environ then it may now point to free'd memory
diff --git a/pp.c b/pp.c
index ae2ff93ad6..a0361da954 100644
--- a/pp.c
+++ b/pp.c
@@ -834,7 +834,7 @@ PP(pp_undef)
     case SVt_PVFM:
 	{
 	    /* let user-undef'd sub keep its identity */
-	    GV* gv = (GV*)SvREFCNT_inc(CvGV((CV*)sv));
+	    GV* gv = CvGV((CV*)sv);
 	    cv_undef((CV*)sv);
 	    CvGV((CV*)sv) = gv;
 	}
diff --git a/scope.c b/scope.c
index 527593542c..f0efaf82e0 100644
--- a/scope.c
+++ b/scope.c
@@ -912,10 +912,6 @@ Perl_leave_scope(pTHX_ I32 base)
 	    PL_op = (OP*)SSPOPPTR;
 	    break;
 	case SAVEt_HINTS:
-	    if (GvHV(PL_hintgv)) {
-		SvREFCNT_dec((SV*)GvHV(PL_hintgv));
-		GvHV(PL_hintgv) = NULL;
-	    }
 	    *(I32*)&PL_hints = (I32)SSPOPINT;
 	    break;
 	case SAVEt_COMPPAD: