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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 1.10 by root, Fri Jul 11 15:33:48 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 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
5#define res_pair(text) \ 19#define res_pair(text) \
6 { \ 20 do { \
7 AV *av = newAV (); \ 21 AV *av = newAV (); \
8 av_push (av, newSVpv (text, 0)); \ 22 av_push (av, newSVpv (text, 0)); \
23 if (rmagical) SvRMAGICAL_on (sv); \
9 av_push (av, newRV_inc (sv)); \ 24 av_push (av, sv_rvweaken (newRV_inc (sv))); \
25 if (rmagical) SvRMAGICAL_off (sv); \
10 av_push (about, newRV_noinc ((SV *)av)); \ 26 av_push (about, newRV_noinc ((SV *)av)); \
11 } 27 } while (0)
12 28
13#define res_gv(sigil) \ 29#define res_gv(sigil) \
14 { \ 30 do { \
15 AV *av = newAV (); \ 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
62
63 switch (SvTYPE (sv)) 82 if (SvTYPE (sv) >= SVt_PVMG)
64 { 83 {
65 case SVt_RV:
66 if (sv != target && SvRV (sv) == targ)
67 res_pair ("referenced by");
68 break;
69 84
70 case SVt_PVAV: 85 if (SvTYPE (sv) == SVt_PVMG && SvPAD_OUR (sv))
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;
76
77 case SVt_PVHV:
78 if (hv_iterinit ((HV *)sv))
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
87 case SVt_PVGV:
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 { 86 {
103 int depth = CvDEPTH (sv); 87 /* I have no clue what this is */
88 /* maybe some placeholder for our variables for eval? */
89 /* it doesn'T seem to reference anything, so we should be able to ignore it */
90 }
91 else
92 {
93 MAGIC *mg = SvMAGIC (sv);
94
104 if (depth) 95 while (mg)
105 { 96 {
106 AV *padlist = CvPADLIST (sv); 97 if (mg->mg_obj == targ)
107 while (depth) 98 res_pair (form ("referenced (in mg_obj) by '%c' type magic attached to", mg->mg_type));
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 99
115 --depth; 100 if ((SV *)mg->mg_ptr == targ && mg->mg_flags & MGf_REFCOUNTED)
116 } 101 res_pair (form ("referenced (in mg_ptr) by '%c' type magic attached to", mg->mg_type));
102
103 mg = mg->mg_moremagic;
117 } 104 }
118 } 105 }
119 break;
120 } 106 }
121 107
108 if (SvROK (sv))
109 {
110 if (sv != target && SvRV (sv) == targ && !SvWEAKREF (sv))
111 res_pair ("referenced by");
112 }
113 else
114 switch (SvTYPE (sv))
115 {
116 case SVt_PVAV:
117 if (AvREAL (sv))
118 for (i = AvFILLp (sv) + 1; i--; )
119 if (AvARRAY (sv)[i] == targ)
120 res_pair (form ("in array element %d of", i));
121
122 break;
123
124 case SVt_PVHV:
125 if (hv_iterinit ((HV *)sv))
126 {
127 HE *he;
128
129 while ((he = hv_iternext ((HV *)sv)))
130 if (HeVAL (he) == targ)
131 res_pair (form ("in the member '%.*s' of", HeKLEN (he), HeKEY (he)));
132 }
133
134 break;
135
136 case SVt_PVCV:
137 {
138 int depth = CvDEPTH (sv);
139
140 /* Anonymous subs have a padlist but zero depth */
141 if (!depth && CvPADLIST (sv))
142 depth = 1;
143
144 if (depth)
145 {
146 AV *padlist = CvPADLIST (sv);
147
148 while (depth)
149 {
150 AV *pad = (AV *)AvARRAY (padlist)[depth];
151
152 av_push (excl, newSVuv (PTR2UV (pad))); /* exclude pads themselves from being found */
153
154 for (i = AvFILLp (pad) + 1; i--; )
155 if (AvARRAY (pad)[i] == targ)
156 {
157 /* Values from constant functions are stored in the pad without any name */
158 SV *name_sv = AvARRAY (AvARRAY (padlist)[0])[i];
159
160 if (name_sv && SvPOK (name_sv))
161 res_pair (form ("in the lexical '%s' in", SvPVX (name_sv)));
162 else
163 res_pair ("in an unnamed lexical in");
164 }
165
166 --depth;
167 }
168 }
169
170 if (CvCONST (sv) && (SV*)CvXSUBANY (sv).any_ptr == targ)
171 res_pair ("the constant value of");
172
173 if (!CvWEAKOUTSIDE (sv) && (SV*)CvOUTSIDE (sv) == targ)
174 res_pair ("the containing scope for");
175 }
176
177 break;
178
179 case SVt_PVGV:
180 if (GvGP (sv))
181 {
182 if (GvSV (sv) == (SV *)targ) res_gv ('$');
183 if (GvAV (sv) == (AV *)targ) res_gv ('@');
184 if (GvHV (sv) == (HV *)targ) res_gv ('%');
185 if (GvCV (sv) == (CV *)targ) res_gv ('&');
186 }
187
188 break;
189 }
190
122 if (rmagical) 191 if (rmagical)
123 SvRMAGICAL_off (sv); 192 SvRMAGICAL_on (sv);
124 } 193 }
125 } 194 }
126 195
127 EXTEND (SP, 2); 196 EXTEND (SP, 2);
128 PUSHs (sv_2mortal (newRV_noinc ((SV *)about))); 197 PUSHs (sv_2mortal (newRV_noinc ((SV *)about)));

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