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/cvs/Devel-FindRef/FindRef.xs
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Comparing Devel-FindRef/FindRef.xs (file contents):
Revision 1.1 by root, Thu Jan 11 22:30:34 2007 UTC vs.
Revision 1.9 by root, Fri Jul 11 15:29:48 2008 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 res_pair(text) \ 5#define PERL_VERSION_ATLEAST(a,b,c) \
6 { \ 6 (PERL_REVISION > (a) \
7 AV *av = newAV (); \ 7 || (PERL_REVISION == (a) \
8 av_push (av, newSVpv (text, 0)); \ 8 && (PERL_VERSION > (b) \
9 av_push (av, newRV_inc (sv)); \ 9 || (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
10 av_push (about, newRV_noinc ((SV *)av)); \
11 }
12 10
13#define res_gv(sigil) \ 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#define res_pair(text) \
14 { \ 20 do { \
15 AV *av = newAV (); \ 21 AV *av = newAV (); \
22 av_push (av, newSVpv (text, 0)); \
23 if (rmagical) SvRMAGICAL_on (sv); \
24 av_push (av, sv_rvweaken (newRV_inc (sv))); \
25 if (rmagical) SvRMAGICAL_off (sv); \
26 av_push (about, newRV_noinc ((SV *)av)); \
27 } while (0)
28
29#define res_gv(sigil) \
30 do { \
31 AV *av = newAV (); \
16 av_push (av, newSVpv (form ("in the global %c%s::%.*s", sigil, \ 32 av_push (av, newSVpv (form ("in the global %c%s::%.*s", sigil, \
17 HvNAME (GvSTASH (sv)), \ 33 HvNAME (GvSTASH (sv)), \
18 GvNAMELEN (sv), GvNAME (sv) ? GvNAME (sv) : "<anonymous>"), \ 34 GvNAMELEN (sv), GvNAME (sv) ? GvNAME (sv) : "<anonymous>"), \
19 0)); \ 35 0)); \
20 av_push (about, newRV_noinc ((SV *)av)); \ 36 av_push (about, newRV_noinc ((SV *)av)); \
21 } 37 } while (0)
22 38
23MODULE = Devel::FindRef PACKAGE = Devel::FindRef 39MODULE = Devel::FindRef PACKAGE = Devel::FindRef
24 40
25PROTOTYPES: ENABLE 41PROTOTYPES: ENABLE
26 42
… …
34void 50void
35find_ (SV *target) 51find_ (SV *target)
36 PPCODE: 52 PPCODE:
37{ 53{
38 SV *arena, *targ; 54 SV *arena, *targ;
39 int rmagical, i; 55 U32 rmagical;
56 int i;
40 AV *about = newAV (); 57 AV *about = newAV ();
41 AV *excl = newAV (); 58 AV *excl = newAV ();
42 59
43 if (!SvROK (target)) 60 if (!SvROK (target))
44 croak ("about expects a reference to a perl value"); 61 croak ("find expects a reference to a perl value");
45 62
46 targ = SvRV (target); 63 targ = SvRV (target);
47 64
48 for (arena = PL_sv_arenaroot; arena; arena = SvANY (arena)) 65 for (arena = PL_sv_arenaroot; arena; arena = SvANY (arena))
49 { 66 {
… …
52 /* Remember that the zeroth slot is used as the pointer onwards, so don't 69 /* Remember that the zeroth slot is used as the pointer onwards, so don't
53 include it. */ 70 include it. */
54 while (--idx > 0) 71 while (--idx > 0)
55 { 72 {
56 SV *sv = &arena [idx]; 73 SV *sv = &arena [idx];
57 74
75 if (SvTYPE (sv) >= SVt_LAST)
76 continue;
77
78 /* temporarily disable RMAGICAL, it can easily interfere with us */
58 if ((rmagical = SvRMAGICAL (sv))) 79 if ((rmagical = SvRMAGICAL (sv)))
59 SvRMAGICAL_off (sv); 80 SvRMAGICAL_off (sv);
60 81
61 //TODO: magic 82 if (SvTYPE (sv) >= SVt_PVMG)
83 {
62 84
63 switch (SvTYPE (sv)) 85 if (SvTYPE (sv) != SVt_PVMG || SvPAD_OUR (sv))
64 { 86 {
65 case SVt_RV: 87 MAGIC *mg = SvMAGIC (sv);
66 if (sv != target && SvRV (sv) == targ)
67 res_pair ("referenced by");
68 break;
69 88
70 case SVt_PVAV: 89 while (mg)
71 if (AvREAL (sv))
72 for (i = AvFILLp (sv) + 1; i--; )
73 if (AvARRAY (sv)[i] == targ)
74 res_pair (form ("in array element %d of", i));
75 break; 90 {
91 if (mg->mg_obj == targ)
92 res_pair (form ("referenced (in mg_obj) by '%c' type magic attached to", mg->mg_type));
76 93
77 case SVt_PVHV: 94 if ((SV *)mg->mg_ptr == targ && mg->mg_flags & MGf_REFCOUNTED)
78 if (hv_iterinit ((HV *)sv)) 95 res_pair (form ("referenced (in mg_ptr) by '%c' type magic attached to", mg->mg_type));
79 {
80 HE *he;
81 while ((he = hv_iternext ((HV *)sv)))
82 if (HeVAL (he) == targ)
83 res_pair (form ("in the member '%.*s' of", HeKLEN (he), HeKEY (he)));
84 }
85 break;
86 96
87 case SVt_PVGV: 97 mg = mg->mg_moremagic;
88 if (GvGP (sv))
89 {
90 if (GvSV (sv) == targ)
91 res_gv ('$');
92 if (GvAV (sv) == (AV *)targ)
93 res_gv ('@');
94 if (GvHV (sv) == (HV *)targ)
95 res_gv ('%');
96 if (GvCV (sv) == (CV *)targ)
97 res_gv ('&');
98 }
99 break;
100
101 case SVt_PVCV:
102 {
103 int depth = CvDEPTH (sv);
104 if (depth)
105 {
106 AV *padlist = CvPADLIST (sv);
107 while (depth)
108 {
109 AV *pad = (AV *)AvARRAY (padlist)[depth];
110 av_push (excl, newSVuv (PTR2UV (pad))); /* exclude pads from being found */
111 for (i = AvFILLp (pad); i--; )
112 if (AvARRAY (pad)[i] == targ)
113 res_pair (form ("in the lexical '%s' in", SvPVX (AvARRAY (AvARRAY (padlist)[0])[i])));
114
115 --depth;
116 }
117 } 98 }
118 } 99 }
119 break;
120 } 100 }
121 101
102 if (SvROK (sv))
103 {
104 if (sv != target && SvRV (sv) == targ && !SvWEAKREF (sv))
105 res_pair ("referenced by");
106 }
107 else
108 switch (SvTYPE (sv))
109 {
110 case SVt_PVAV:
111 if (AvREAL (sv))
112 for (i = AvFILLp (sv) + 1; i--; )
113 if (AvARRAY (sv)[i] == targ)
114 res_pair (form ("in array element %d of", i));
115
116 break;
117
118 case SVt_PVHV:
119 if (hv_iterinit ((HV *)sv))
120 {
121 HE *he;
122
123 while ((he = hv_iternext ((HV *)sv)))
124 if (HeVAL (he) == targ)
125 res_pair (form ("in the member '%.*s' of", HeKLEN (he), HeKEY (he)));
126 }
127
128 break;
129
130 case SVt_PVCV:
131 {
132 int depth = CvDEPTH (sv);
133
134 /* Anonymous subs have a padlist but zero depth */
135 if (!depth && CvPADLIST (sv))
136 depth = 1;
137
138 if (depth)
139 {
140 AV *padlist = CvPADLIST (sv);
141
142 while (depth)
143 {
144 AV *pad = (AV *)AvARRAY (padlist)[depth];
145
146 av_push (excl, newSVuv (PTR2UV (pad))); /* exclude pads themselves from being found */
147
148 for (i = AvFILLp (pad) + 1; i--; )
149 if (AvARRAY (pad)[i] == targ)
150 {
151 /* Values from constant functions are stored in the pad without any name */
152 SV *name_sv = AvARRAY (AvARRAY (padlist)[0])[i];
153
154 if (name_sv && SvPOK (name_sv))
155 res_pair (form ("in the lexical '%s' in", SvPVX (name_sv)));
156 else
157 res_pair ("in an unnamed lexical in");
158 }
159
160 --depth;
161 }
162 }
163
164 if (CvCONST (sv) && (SV*)CvXSUBANY (sv).any_ptr == targ)
165 res_pair ("the constant value of");
166
167 if (!CvWEAKOUTSIDE (sv) && (SV*)CvOUTSIDE (sv) == targ)
168 res_pair ("the containing scope for");
169 }
170
171 break;
172
173 case SVt_PVGV:
174 if (GvGP (sv))
175 {
176 if (GvSV (sv) == (SV *)targ) res_gv ('$');
177 if (GvAV (sv) == (AV *)targ) res_gv ('@');
178 if (GvHV (sv) == (HV *)targ) res_gv ('%');
179 if (GvCV (sv) == (CV *)targ) res_gv ('&');
180 }
181
182 break;
183 }
184
122 if (rmagical) 185 if (rmagical)
123 SvRMAGICAL_off (sv); 186 SvRMAGICAL_on (sv);
124 } 187 }
125 } 188 }
126 189
127 EXTEND (SP, 2); 190 EXTEND (SP, 2);
128 PUSHs (sv_2mortal (newRV_noinc ((SV *)about))); 191 PUSHs (sv_2mortal (newRV_noinc ((SV *)about)));

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