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/cvs/Devel-FindRef/FindRef.xs
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Comparing Devel-FindRef/FindRef.xs (file contents):
Revision 1.4 by root, Wed Feb 7 21:34:02 2007 UTC vs.
Revision 1.16 by root, Fri Jun 26 14:47:03 2009 UTC

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

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