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/cvs/Devel-FindRef/FindRef.xs
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Comparing Devel-FindRef/FindRef.xs (file contents):
Revision 1.11 by root, Fri Jul 11 17:59:19 2008 UTC vs.
Revision 1.26 by root, Fri Jun 23 14:40:34 2017 UTC

… …
4 4
5#define PERL_VERSION_ATLEAST(a,b,c) \ 5#define PERL_VERSION_ATLEAST(a,b,c) \
6 (PERL_REVISION > (a) \ 6 (PERL_REVISION > (a) \
7 || (PERL_REVISION == (a) \ 7 || (PERL_REVISION == (a) \
8 && (PERL_VERSION > (b) \ 8 && (PERL_VERSION > (b) \
9 || (PERL_VERSION == (b) && PERLSUBVERSION >= (c))))) 9 || (PERL_VERSION == (b) && PERL_SUBVERSION >= (c)))))
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) 15#ifndef SvPAD_OUR
16# define SvPAD_OUR(dummy) 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
24#ifndef PadARRAY
25typedef AV PADNAMELIST;
26typedef SV PADNAME;
27# define PadnamePV(sv) SvPVX (sv)
28# define PadnameLEN(sv) SvCUR (sv)
29# define PadARRAY(pad) AvARRAY (pad)
30# define PadlistARRAY(pl) ((PAD **)AvARRAY (pl))
31#endif
32
33#ifndef PadMAX
34# define PadMAX(pad) AvFILLp (pad)
35#endif
36
37#ifndef padnamelist_fetch
38# define padnamelist_fetch(a,b) *av_fetch (a, b, FALSE)
39#endif
40
41#ifndef PadlistNAMES
42# define PadlistNAMES(padlist) *PadlistARRAY (padlist)
17#endif 43#endif
18 44
19#define res_pair(text) \ 45#define res_pair(text) \
20 do { \ 46 do { \
21 AV *av = newAV (); \ 47 AV *av = newAV (); \
… …
32 av_push (av, newSVpv (text, 0)); \ 58 av_push (av, newSVpv (text, 0)); \
33 av_push (about, newRV_noinc ((SV *)av)); \ 59 av_push (about, newRV_noinc ((SV *)av)); \
34 } while (0) 60 } while (0)
35 61
36#define res_gv(sigil) \ 62#define res_gv(sigil) \
37 res_text (form ("in the global %c%s::%.*s", sigil, \ 63 res_text (form ("the global %c%s::%.*s", sigil, \
38 HvNAME (GvSTASH (sv)), \ 64 HvNAME (GvSTASH (sv)), \
39 GvNAMELEN (sv), \ 65 GvNAME_HEK (sv) ? GvNAMELEN (sv) : 11, \
40 GvNAME (sv) ? GvNAME (sv) : "<anonymous>")) 66 GvNAME_HEK (sv) ? GvNAME (sv) : "<anonymous>"))
41 67
42MODULE = Devel::FindRef PACKAGE = Devel::FindRef 68MODULE = Devel::FindRef PACKAGE = Devel::FindRef
43 69
44PROTOTYPES: ENABLE 70PROTOTYPES: ENABLE
45 71
46SV *
47ptr2ref (IV ptr)
48 CODE:
49 RETVAL = newRV_inc (INT2PTR (SV *, ptr));
50 OUTPUT:
51 RETVAL
52
53void 72void
54find_ (SV *target) 73find_ (SV *target_ref)
55 PPCODE: 74 PPCODE:
56{ 75{
57 SV *arena, *targ; 76 SV *arena, *targ;
58 U32 rmagical; 77 U32 rmagical;
59 int i; 78 int i;
60 AV *about = newAV (); 79 AV *about = newAV ();
61 AV *excl = newAV (); 80 AV *excl = newAV ();
62 81
63 if (!SvROK (target)) 82 if (!SvROK (target_ref))
64 croak ("find expects a reference to a perl value"); 83 croak ("find expects a reference to a perl value");
65 84
66 targ = SvRV (target); 85 targ = SvRV (target_ref);
67 86
68 for (arena = PL_sv_arenaroot; arena; arena = SvANY (arena)) 87 if (SvIMMORTAL (targ))
69 { 88 {
70 UV idx = SvREFCNT (arena); 89 if (targ == &PL_sv_undef)
71 90 res_text ("the immortal 'undef' value");
72 /* Remember that the zeroth slot is used as the pointer onwards, so don't 91 else if (targ == &PL_sv_yes)
73 include it. */ 92 res_text ("the immortal 'yes' value");
74 while (--idx > 0) 93 else if (targ == &PL_sv_no)
94 res_text ("the immortal 'no' value");
95 else if (targ == &PL_sv_placeholder)
96 res_text ("the immortal placeholder value");
97 else
98 res_text ("some unknown immortal");
99 }
100 else
101 {
102 for (arena = PL_sv_arenaroot; arena; arena = SvANY (arena))
75 { 103 {
76 SV *sv = &arena [idx]; 104 UV idx = SvREFCNT (arena);
77 105
78 if (SvTYPE (sv) >= SVt_LAST) 106 /* Remember that the zeroth slot is used as the pointer onwards, so don't
79 continue; 107 include it. */
80 108 while (--idx > 0)
81 /* temporarily disable RMAGICAL, it can easily interfere with us */
82 if ((rmagical = SvRMAGICAL (sv)))
83 SvRMAGICAL_off (sv);
84
85 if (SvTYPE (sv) >= SVt_PVMG)
86 { 109 {
110 SV *sv = &arena [idx];
111
112 if (SvTYPE (sv) >= SVt_LAST)
113 continue;
114
115 /* temporarily disable RMAGICAL, it can easily interfere with us */
116 if ((rmagical = SvRMAGICAL (sv)))
117 SvRMAGICAL_off (sv);
118
87 if (SvTYPE (sv) == SVt_PVMG && SvPAD_OUR (sv)) 119 if (SvTYPE (sv) >= SVt_PVMG)
88 { 120 {
121#if !PERL_VERSION_ATLEAST (5,21,6)
122 if (SvTYPE (sv) == SVt_PVMG && SvPAD_OUR (sv))
123 {
89 /* I have no clue what this is */ 124 /* I have no clue what this is */
90 /* maybe some placeholder for our variables for eval? */ 125 /* maybe some placeholder for our variables for eval? */
91 /* it doesn't seem to reference anything, so we should be able to ignore it */ 126 /* it doesn't seem to reference anything, so we should be able to ignore it */
127 }
128 else
129#endif
130 if (SvMAGICAL (sv)) /* name-pads use SvMAGIC for other purposes */
131 {
132 MAGIC *mg = SvMAGIC (sv);
133
134 while (mg)
135 {
136 if (mg->mg_obj == targ && mg->mg_flags & MGf_REFCOUNTED)
137 res_pair (form ("referenced (in mg_obj) by '%c' type magic attached to", mg->mg_type));
138
139 if ((SV *)mg->mg_ptr == targ)
140 res_pair (form ("%sreferenced (in mg_ptr) by '%c' type magic attached to",
141 mg->mg_len == HEf_SVKEY ? "" : "possibly ",
142 mg->mg_type));
143
144 mg = mg->mg_moremagic;
145 }
146 }
147 }
148
149 if (SvROK (sv))
150 {
151 if (SvRV (sv) == targ && !SvWEAKREF (sv) && sv != target_ref)
152 res_pair ("referenced by");
92 } 153 }
93 else 154 else
155 switch (SvTYPE (sv))
94 { 156 {
95 MAGIC *mg = SvMAGIC (sv); 157 case SVt_PVAV:
158 if (AvREAL (sv))
159 for (i = AvFILLp (sv) + 1; i--; )
160 if (AvARRAY (sv)[i] == targ)
161 res_pair (form ("the array element %d of", i));
96 162
97 while (mg) 163 break;
164
165 case SVt_PVHV:
166 if (hv_iterinit ((HV *)sv))
167 {
168 HE *he;
169
170 while ((he = hv_iternext ((HV *)sv)))
171 if (HeVAL (he) == targ)
172 res_pair (form ("the hash member '%.*s' of", HeKLEN (he), HeKEY (he)));
173 }
174
175 break;
176
177 case SVt_PVCV:
98 { 178 {
99 if (mg->mg_obj == targ) 179 PADLIST *padlist = CvPADLIST (sv);
100 res_pair (form ("referenced (in mg_obj) by '%c' type magic attached to", mg->mg_type));
101 180
102 if ((SV *)mg->mg_ptr == targ && mg->mg_flags & MGf_REFCOUNTED) 181 if (padlist)
103 res_pair (form ("referenced (in mg_ptr) by '%c' type magic attached to", mg->mg_type)); 182 {
183 int depth = CvDEPTH (sv);
104 184
105 mg = mg->mg_moremagic; 185 /* Anonymous subs have a padlist but zero depth */
186 /* some hacks switch CvANON off, so we just blindly assume a minimum of 1 */
187 if (!depth && !PERL_VERSION_ATLEAST (5,21,6))
188 depth = 1;
189
190 while (depth)
191 {
192 PAD *pad = PadlistARRAY (padlist)[depth];
193
194 av_push (excl, newSVuv (PTR2UV (pad))); /* exclude pads themselves from being found */
195
196 /* The 0th pad slot is @_ */
197 if (PadARRAY (pad)[0] == targ)
198 res_pair ("the argument array for");
199
200 for (i = PadMAX (pad) + 1; --i; )
201 if (PadARRAY (pad)[i] == targ)
202 {
203 /* Values from constant functions are stored in the pad without any name */
204 PADNAME *name = padnamelist_fetch (PadlistNAMES (padlist), i);
205
206 if (name && PadnamePV (name) && *PadnamePV (name))
207 res_pair (form ("the lexical '%s' in", PadnamePV (name)));
208 else
209 res_pair ("an unnamed lexical in");
210 }
211
212 --depth;
213 }
214 }
215
216 if (CvCONST (sv) && (SV*)CvXSUBANY (sv).any_ptr == targ)
217 res_pair ("the constant value of");
218
219 if (!CvWEAKOUTSIDE (sv) && (SV*)CvOUTSIDE (sv) == targ)
220 res_pair ("the containing scope for");
221
222 if (sv == targ && CvANON (sv))
223 if (CvSTART (sv)
224 && CvSTART (sv)->op_type == OP_NEXTSTATE
225 && CopLINE ((COP *)CvSTART (sv)))
226 res_text (form ("the closure created at %s:%d",
227 CopFILE ((COP *)CvSTART (sv)) ? CopFILE ((COP *)CvSTART (sv)) : "<unknown>",
228 CopLINE ((COP *)CvSTART (sv))));
229 else
230 res_text (form ("the closure created somewhere in file %s (PLEASE REPORT!)",
231 CvFILE (sv) ? CvFILE (sv) : "<unknown>"));
106 } 232 }
233
234 break;
235
236 case SVt_PVGV:
237 if (GvGP (sv))
238 {
239 if (GvSV (sv) == (SV *)targ) res_gv ('$');
240 if (GvAV (sv) == (AV *)targ) res_gv ('@');
241 if (GvHV (sv) == (HV *)targ) res_gv ('%');
242 if (GvCV (sv) == (CV *)targ) res_gv ('&');
243 }
244
245 break;
246
247 case SVt_PVLV:
248 if (LvTARG (sv) == targ)
249 {
250 if (LvTYPE (sv) == 'y')
251 {
252 MAGIC *mg = mg_find (sv, PERL_MAGIC_defelem);
253
254 if (mg && mg->mg_obj)
255 res_pair (form ("the target for the lvalue hash element '%.*s',",
256 (int)SvCUR (mg->mg_obj), SvPV_nolen (mg->mg_obj)));
257 else
258 res_pair (form ("the target for the lvalue array element #%d,", LvTARGOFF (sv)));
259 }
260 else
261 res_pair (form ("an lvalue reference target (type '%c', ofs %d, len %d),",
262 LvTYPE (sv), LvTARGOFF (sv), LvTARGLEN (sv)));
263 }
264
265 break;
107 } 266 }
267
268 if (rmagical)
269 SvRMAGICAL_on (sv);
108 } 270 }
109
110 if (SvROK (sv))
111 {
112 if (sv != target && SvRV (sv) == targ && !SvWEAKREF (sv))
113 res_pair ("referenced by");
114 }
115 else
116 switch (SvTYPE (sv))
117 {
118 case SVt_PVAV:
119 if (AvREAL (sv))
120 for (i = AvFILLp (sv) + 1; i--; )
121 if (AvARRAY (sv)[i] == targ)
122 res_pair (form ("in array element %d of", i));
123
124 break;
125
126 case SVt_PVHV:
127 if (hv_iterinit ((HV *)sv))
128 {
129 HE *he;
130
131 while ((he = hv_iternext ((HV *)sv)))
132 if (HeVAL (he) == targ)
133 res_pair (form ("in the member '%.*s' of", HeKLEN (he), HeKEY (he)));
134 }
135
136 break;
137
138 case SVt_PVCV:
139 {
140 int depth = CvDEPTH (sv);
141
142 /* Anonymous subs have a padlist but zero depth */
143 if (CvANON (sv) && !depth && CvPADLIST (sv))
144 depth = 1;
145
146 if (depth)
147 {
148 AV *padlist = CvPADLIST (sv);
149
150 while (depth)
151 {
152 AV *pad = (AV *)AvARRAY (padlist)[depth];
153
154 av_push (excl, newSVuv (PTR2UV (pad))); /* exclude pads themselves from being found */
155
156 for (i = AvFILLp (pad) + 1; i--; )
157 if (AvARRAY (pad)[i] == targ)
158 {
159 /* Values from constant functions are stored in the pad without any name */
160 SV *name_sv = AvARRAY (AvARRAY (padlist)[0])[i];
161
162 if (name_sv && SvPOK (name_sv))
163 res_pair (form ("in the lexical '%s' in", SvPVX (name_sv)));
164 else
165 res_pair ("in an unnamed lexical in");
166 }
167
168 --depth;
169 }
170 }
171
172 if (CvCONST (sv) && (SV*)CvXSUBANY (sv).any_ptr == targ)
173 res_pair ("the constant value of");
174
175 if (!CvWEAKOUTSIDE (sv) && (SV*)CvOUTSIDE (sv) == targ)
176 res_pair ("the containing scope for");
177
178 if (sv == targ && CvANON (sv))
179 if (CvSTART (sv)
180 && CvSTART (sv)->op_type == OP_NEXTSTATE
181 && CopLINE ((COP *)CvSTART (sv)))
182 res_text (form ("the closure created at %s:%d",
183 CopFILE ((COP *)CvSTART (sv)) ? CopFILE ((COP *)CvSTART (sv)) : "<unknown>",
184 CopLINE ((COP *)CvSTART (sv))));
185 else
186 res_text (form ("the closure created somewhere in file %s (PLEASE REPORT!)",
187 CvFILE (sv) ? CvFILE (sv) : "<unknown>"));
188 }
189
190 break;
191
192 case SVt_PVGV:
193 if (GvGP (sv))
194 {
195 if (GvSV (sv) == (SV *)targ) res_gv ('$');
196 if (GvAV (sv) == (AV *)targ) res_gv ('@');
197 if (GvHV (sv) == (HV *)targ) res_gv ('%');
198 if (GvCV (sv) == (CV *)targ) res_gv ('&');
199 }
200
201 break;
202 }
203
204 if (rmagical)
205 SvRMAGICAL_on (sv);
206 } 271 }
272
273 /* look at the mortalise stack of the current coroutine */
274 for (i = 0; i <= PL_tmps_ix; ++i)
275 if (PL_tmps_stack [i] == targ)
276 res_text ("a temporary on the stack");
277
278 if (targ == (SV*)PL_main_cv)
279 res_text ("the main body of the program");
207 } 280 }
208 281
209 EXTEND (SP, 2); 282 EXTEND (SP, 2);
210 PUSHs (sv_2mortal (newRV_noinc ((SV *)about))); 283 PUSHs (sv_2mortal (newRV_noinc ((SV *)about)));
211 PUSHs (sv_2mortal (newRV_noinc ((SV *)excl))); 284 PUSHs (sv_2mortal (newRV_noinc ((SV *)excl)));
212} 285}
213 286
287SV *
288ptr2ref (UV ptr)
289 CODE:
290 RETVAL = newRV_inc (INT2PTR (SV *, ptr));
291 OUTPUT:
292 RETVAL
293
294UV
295ref2ptr (SV *rv)
296 CODE:
297 if (!SvROK (rv))
298 croak ("argument to Devel::FindRef::ref2ptr must be a reference");
299 RETVAL = PTR2UV (SvRV (rv));
300 OUTPUT:
301 RETVAL
302
303U32
304_refcnt (SV *rv)
305 CODE:
306 if (!SvROK (rv))
307 croak ("argument to Devel::FindRef::_refcnt must be a reference");
308 RETVAL = SvREFCNT (SvRV (rv));
309 OUTPUT:
310 RETVAL

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