[ViewVC] Diff of: cvs/Devel-FindRef/FindRef.xs

Comparing Devel-FindRef/FindRef.xs (file contents):
Revision 1.2 by root, Thu Jan 11 23:05:52 2007 UTC vs.
Revision 1.20 by root, Tue Sep 8 18:12:07 2009 UTC

1	#include "EXTERN.h"	1	#include "EXTERN.h"
2	#include "perl.h"	2	#include "perl.h"
3	#include "XSUB.h"	3	#include "XSUB.h"
4		4
		5	#define PERL_VERSION_ATLEAST(a,b,c) \
		6	(PERL_REVISION > (a) \
		7	\|\| (PERL_REVISION == (a) \
		8	&& (PERL_VERSION > (b) \
		9	\|\| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		10
		11	#if !PERL_VERSION_ATLEAST (5,8,9)
		12	# define SVt_LAST 16
		13	#endif
		14
		15	#if !PERL_VERSION_ATLEAST (5,10,0)
		16	# define SvPAD_OUR(dummy) 0
		17	#endif
		18
		19	/* pre-5.10 perls always succeed, with 5.10, we have to check first apparently */
		20	#ifndef GvNAME_HEK
		21	# define GvNAME_HEK(sv) 1
		22	#endif
		23
5	#define res_pair(text) \	24	#define res_pair(text) \
6	{ \	25	do { \
7	AV *av = newAV (); \	26	AV *av = newAV (); \
8	av_push (av, newSVpv (text, 0)); \	27	av_push (av, newSVpv (text, 0)); \
		28	if (rmagical) SvRMAGICAL_on (sv); \
9	av_push (av, newRV_inc (sv)); \	29	av_push (av, sv_rvweaken (newRV_inc (sv))); \
		30	if (rmagical) SvRMAGICAL_off (sv); \
10	av_push (about, newRV_noinc ((SV *)av)); \	31	av_push (about, newRV_noinc ((SV *)av)); \
11	}	32	} while (0)
12		33
13	#define res_gv(sigil) \	34	#define res_text(text) \
14	{ \	35	do { \
15	AV *av = newAV (); \	36	AV *av = newAV (); \
16	av_push (av, newSVpv (form ("in the global %c%s::%.*s", sigil, \	37	av_push (av, newSVpv (text, 0)); \
17	HvNAME (GvSTASH (sv)), \
18	GvNAMELEN (sv), GvNAME (sv) ? GvNAME (sv) : "<anonymous>"), \
19	0)); \
20	av_push (about, newRV_noinc ((SV *)av)); \	38	av_push (about, newRV_noinc ((SV *)av)); \
21	}	39	} while (0)
		40
		41	#define res_gv(sigil) \
		42	res_text (form ("the global %c%s::%.*s", sigil, \
		43	HvNAME (GvSTASH (sv)), \
		44	GvNAME_HEK (sv) ? GvNAMELEN (sv) : 11, \
		45	GvNAME_HEK (sv) ? GvNAME (sv) : "<anonymous>"))
22		46
23	MODULE = Devel::FindRef PACKAGE = Devel::FindRef	47	MODULE = Devel::FindRef PACKAGE = Devel::FindRef
24		48
25	PROTOTYPES: ENABLE	49	PROTOTYPES: ENABLE
26		50
		51	void
		52	find_ (SV *target_ref)
		53	PPCODE:
		54	{
		55	SV arena, targ;
		56	U32 rmagical;
		57	int i;
		58	AV *about = newAV ();
		59	AV *excl = newAV ();
		60
		61	if (!SvROK (target_ref))
		62	croak ("find expects a reference to a perl value");
		63
		64	targ = SvRV (target_ref);
		65
		66	if (SvIMMORTAL (targ))
		67	{
		68	if (targ == &PL_sv_undef)
		69	res_text ("the immortal 'undef' value");
		70	else if (targ == &PL_sv_yes)
		71	res_text ("the immortal 'yes' value");
		72	else if (targ == &PL_sv_no)
		73	res_text ("the immortal 'no' value");
		74	else if (targ == &PL_sv_placeholder)
		75	res_text ("the immortal placeholder value");
		76	else
		77	res_text ("some unknown immortal");
		78	}
		79	else
		80	{
		81	for (arena = PL_sv_arenaroot; arena; arena = SvANY (arena))
		82	{
		83	UV idx = SvREFCNT (arena);
		84
		85	/* Remember that the zeroth slot is used as the pointer onwards, so don't
		86	include it. */
		87	while (--idx > 0)
		88	{
		89	SV *sv = &arena [idx];
		90
		91	if (SvTYPE (sv) >= SVt_LAST)
		92	continue;
		93
		94	/* temporarily disable RMAGICAL, it can easily interfere with us */
		95	if ((rmagical = SvRMAGICAL (sv)))
		96	SvRMAGICAL_off (sv);
		97
		98	if (SvTYPE (sv) >= SVt_PVMG)
		99	{
		100	if (SvTYPE (sv) == SVt_PVMG && SvPAD_OUR (sv))
		101	{
		102	/* I have no clue what this is */
		103	/* maybe some placeholder for our variables for eval? */
		104	/* it doesn't seem to reference anything, so we should be able to ignore it */
		105	}
		106	else
		107	{
		108	MAGIC *mg = SvMAGIC (sv);
		109
		110	while (mg)
		111	{
		112	if (mg->mg_obj == targ && mg->mg_flags & MGf_REFCOUNTED)
		113	res_pair (form ("referenced (in mg_obj) by '%c' type magic attached to", mg->mg_type));
		114
		115	if ((SV *)mg->mg_ptr == targ)
		116	res_pair (form ("%sreferenced (in mg_ptr) by '%c' type magic attached to",
		117	mg->mg_len == HEf_SVKEY ? "" : "possibly ",
		118	mg->mg_type));
		119
		120	mg = mg->mg_moremagic;
		121	}
		122	}
		123	}
		124
		125	if (SvROK (sv))
		126	{
		127	if (SvRV (sv) == targ && !SvWEAKREF (sv) && sv != target_ref)
		128	res_pair ("referenced by");
		129	}
		130	else
		131	switch (SvTYPE (sv))
		132	{
		133	case SVt_PVAV:
		134	if (AvREAL (sv))
		135	for (i = AvFILLp (sv) + 1; i--; )
		136	if (AvARRAY (sv)[i] == targ)
		137	res_pair (form ("the array element %d of", i));
		138
		139	break;
		140
		141	case SVt_PVHV:
		142	if (hv_iterinit ((HV *)sv))
		143	{
		144	HE *he;
		145
		146	while ((he = hv_iternext ((HV *)sv)))
		147	if (HeVAL (he) == targ)
		148	res_pair (form ("the member '%.*s' of", HeKLEN (he), HeKEY (he)));
		149	}
		150
		151	break;
		152
		153	case SVt_PVCV:
		154	{
		155	int depth = CvDEPTH (sv);
		156
		157	/* Anonymous subs have a padlist but zero depth */
		158	if (CvANON (sv) && !depth && CvPADLIST (sv))
		159	depth = 1;
		160
		161	if (depth)
		162	{
		163	AV *padlist = CvPADLIST (sv);
		164
		165	while (depth)
		166	{
		167	AV pad = (AV )AvARRAY (padlist)[depth];
		168
		169	av_push (excl, newSVuv (PTR2UV (pad))); /* exclude pads themselves from being found */
		170
		171	/* The 0th pad slot is @_ */
		172	if (AvARRAY (pad)[0] == targ)
		173	res_pair ("the argument array for");
		174
		175	for (i = AvFILLp (pad) + 1; --i; )
		176	if (AvARRAY (pad)[i] == targ)
		177	{
		178	/* Values from constant functions are stored in the pad without any name */
		179	SV *name_sv = AvARRAY (AvARRAY (padlist)[0])[i];
		180
		181	if (name_sv && SvPOK (name_sv))
		182	res_pair (form ("the lexical '%s' in", SvPVX (name_sv)));
		183	else
		184	res_pair ("an unnamed lexical in");
		185	}
		186
		187	--depth;
		188	}
		189	}
		190
		191	if (CvCONST (sv) && (SV*)CvXSUBANY (sv).any_ptr == targ)
		192	res_pair ("the constant value of");
		193
		194	if (!CvWEAKOUTSIDE (sv) && (SV*)CvOUTSIDE (sv) == targ)
		195	res_pair ("the containing scope for");
		196
		197	if (sv == targ && CvANON (sv))
		198	if (CvSTART (sv)
		199	&& CvSTART (sv)->op_type == OP_NEXTSTATE
		200	&& CopLINE ((COP *)CvSTART (sv)))
		201	res_text (form ("the closure created at %s:%d",
		202	CopFILE ((COP )CvSTART (sv)) ? CopFILE ((COP )CvSTART (sv)) : "<unknown>",
		203	CopLINE ((COP *)CvSTART (sv))));
		204	else
		205	res_text (form ("the closure created somewhere in file %s (PLEASE REPORT!)",
		206	CvFILE (sv) ? CvFILE (sv) : "<unknown>"));
		207	}
		208
		209	break;
		210
		211	case SVt_PVGV:
		212	if (GvGP (sv))
		213	{
		214	if (GvSV (sv) == (SV *)targ) res_gv ('$');
		215	if (GvAV (sv) == (AV *)targ) res_gv ('@');
		216	if (GvHV (sv) == (HV *)targ) res_gv ('%');
		217	if (GvCV (sv) == (CV *)targ) res_gv ('&');
		218	}
		219
		220	break;
		221
		222	case SVt_PVLV:
		223	if (LvTARG (sv) == targ)
		224	{
		225	if (LvTYPE (sv) == 'y')
		226	{
		227	MAGIC *mg = mg_find (sv, PERL_MAGIC_defelem);
		228
		229	if (mg && mg->mg_obj)
		230	res_pair (form ("the target for the lvalue hash element '%.*s',",
		231	(int)SvCUR (mg->mg_obj), SvPV_nolen (mg->mg_obj)));
		232	else
		233	res_pair (form ("the target for the lvalue array element #%d,", LvTARGOFF (sv)));
		234	}
		235	else
		236	res_pair (form ("an lvalue reference target (type '%c', ofs %d, len %d),",
		237	LvTYPE (sv), LvTARGOFF (sv), LvTARGLEN (sv)));
		238	}
		239
		240	break;
		241	}
		242
		243	if (rmagical)
		244	SvRMAGICAL_on (sv);
		245	}
		246	}
		247
		248	/* look at the mortalise stack of the current coroutine */
		249	for (i = 0; i <= PL_tmps_ix; ++i)
		250	if (PL_tmps_stack [i] == targ)
		251	res_text ("a temporary on the stack");
		252
		253	if (targ == (SV*)PL_main_cv)
		254	res_text ("the main body of the program");
		255	}
		256
		257	EXTEND (SP, 2);
		258	PUSHs (sv_2mortal (newRV_noinc ((SV *)about)));
		259	PUSHs (sv_2mortal (newRV_noinc ((SV *)excl)));
		260	}
		261
27	SV *	262	SV *
28	ptr2ref (IV ptr)	263	ptr2ref (UV ptr)
29	CODE:	264	CODE:
30	RETVAL = newRV_inc (INT2PTR (SV *, ptr));	265	RETVAL = newRV_inc (INT2PTR (SV *, ptr));
31	OUTPUT:	266	OUTPUT:
32	RETVAL	267	RETVAL
33		268
34	void	269	UV
35	find_ (SV *target)	270	ref2ptr (SV *rv)
36	PPCODE:	271	CODE:
37	{	272	if (!SvROK (rv))
38	SV arena, targ;	273	croak ("argument to Devel::FindRef::ref2ptr must be a reference");
39	int rmagical, i;	274	RETVAL = PTR2UV (SvRV (rv));
40	AV *about = newAV ();	275	OUTPUT:
41	AV *excl = newAV ();	276	RETVAL
42		277
43	if (!SvROK (target))	278	U32
44	croak ("about expects a reference to a perl value");	279	_refcnt (SV *rv)
45		280	CODE:
46	targ = SvRV (target);	281	if (!SvROK (rv))
47		282	croak ("argument to Devel::FindRef::_refcnt must be a reference");
48	for (arena = PL_sv_arenaroot; arena; arena = SvANY (arena))	283	RETVAL = SvREFCNT (SvRV (rv));
49	{	284	OUTPUT:
50	UV idx = SvREFCNT (arena);	285	RETVAL
51
52	/* Remember that the zeroth slot is used as the pointer onwards, so don't
53	include it. */
54	while (--idx > 0)
55	{
56	SV *sv = &arena [idx];
57
58	if (SvTYPE (sv) >= SVt_LAST)
59	continue;
60
61	/* temporarily disable RMAGICAL, it can easily interfere with us */
62	if ((rmagical = SvRMAGICAL (sv)))
63	SvRMAGICAL_off (sv);
64
65	if (SvTYPE (sv) >= SVt_PVMG)
66	{
67	MAGIC *mg = SvMAGIC (sv);
68	while (mg)
69	{
70	if (mg->mg_obj == targ)
71	res_pair (form ("referenced (in mg_obj) by '%c' type magic attached to", mg->mg_type));
72	if ((SV *)mg->mg_ptr == targ && mg->mg_flags & MGf_REFCOUNTED)
73	res_pair (form ("referenced (in mg_ptr) by '%c' type magic attached to", mg->mg_type));
74
75	mg = mg->mg_moremagic;
76	}
77	}
78
79	switch (SvTYPE (sv))
80	{
81	case SVt_RV:
82	if (sv != target && SvRV (sv) == targ)
83	res_pair ("referenced by");
84	break;
85
86	case SVt_PVAV:
87	if (AvREAL (sv))
88	for (i = AvFILLp (sv) + 1; i--; )
89	if (AvARRAY (sv)[i] == targ)
90	res_pair (form ("in array element %d of", i));
91	break;
92
93	case SVt_PVHV:
94	if (hv_iterinit ((HV *)sv))
95	{
96	HE *he;
97	while ((he = hv_iternext ((HV *)sv)))
98	if (HeVAL (he) == targ)
99	res_pair (form ("in the member '%.*s' of", HeKLEN (he), HeKEY (he)));
100	}
101	break;
102
103	case SVt_PVCV:
104	{
105	int depth = CvDEPTH (sv);
106	if (depth)
107	{
108	AV *padlist = CvPADLIST (sv);
109	while (depth)
110	{
111	AV pad = (AV )AvARRAY (padlist)[depth];
112	av_push (excl, newSVuv (PTR2UV (pad))); /* exclude pads from being found */
113	for (i = AvFILLp (pad); i--; )
114	if (AvARRAY (pad)[i] == targ)
115	res_pair (form ("in the lexical '%s' in", SvPVX (AvARRAY (AvARRAY (padlist)[0])[i])));
116
117	--depth;
118	}
119	}
120	}
121	break;
122
123	case SVt_PVGV:
124	if (GvGP (sv))
125	{
126	if (GvSV (sv) == targ)
127	res_gv ('$');
128	if (GvAV (sv) == (AV *)targ)
129	res_gv ('@');
130	if (GvHV (sv) == (HV *)targ)
131	res_gv ('%');
132	if (GvCV (sv) == (CV *)targ)
133	res_gv ('&');
134	}
135	break;
136	}
137
138	if (rmagical)
139	SvRMAGICAL_off (sv);
140	}
141	}
142
143	EXTEND (SP, 2);
144	PUSHs (sv_2mortal (newRV_noinc ((SV *)about)));
145	PUSHs (sv_2mortal (newRV_noinc ((SV *)excl)));
146	}
147

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Comparing Devel-FindRef/FindRef.xs (file contents): Revision 1.2 by root, Thu Jan 11 23:05:52 2007 UTC vs. Revision 1.20 by root, Tue Sep 8 18:12:07 2009 UTC

Diff Legend

Comparing Devel-FindRef/FindRef.xs (file contents):
Revision 1.2 by root, Thu Jan 11 23:05:52 2007 UTC vs.
Revision 1.20 by root, Tue Sep 8 18:12:07 2009 UTC