1 |
#include "EXTERN.h" |
2 |
#include "perl.h" |
3 |
#include "XSUB.h" |
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 |
|
24 |
#define res_pair(text) \ |
25 |
do { \ |
26 |
AV *av = newAV (); \ |
27 |
av_push (av, newSVpv (text, 0)); \ |
28 |
if (rmagical) SvRMAGICAL_on (sv); \ |
29 |
av_push (av, sv_rvweaken (newRV_inc (sv))); \ |
30 |
if (rmagical) SvRMAGICAL_off (sv); \ |
31 |
av_push (about, newRV_noinc ((SV *)av)); \ |
32 |
} while (0) |
33 |
|
34 |
#define res_text(text) \ |
35 |
do { \ |
36 |
AV *av = newAV (); \ |
37 |
av_push (av, newSVpv (text, 0)); \ |
38 |
av_push (about, newRV_noinc ((SV *)av)); \ |
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>")) |
46 |
|
47 |
MODULE = Devel::FindRef PACKAGE = Devel::FindRef |
48 |
|
49 |
PROTOTYPES: ENABLE |
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 ("in the hash 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 |
|
262 |
SV * |
263 |
ptr2ref (UV ptr) |
264 |
CODE: |
265 |
RETVAL = newRV_inc (INT2PTR (SV *, ptr)); |
266 |
OUTPUT: |
267 |
RETVAL |
268 |
|
269 |
UV |
270 |
ref2ptr (SV *rv) |
271 |
CODE: |
272 |
if (!SvROK (rv)) |
273 |
croak ("argument to Devel::FindRef::ref2ptr must be a reference"); |
274 |
RETVAL = PTR2UV (SvRV (rv)); |
275 |
OUTPUT: |
276 |
RETVAL |
277 |
|
278 |
U32 |
279 |
_refcnt (SV *rv) |
280 |
CODE: |
281 |
if (!SvROK (rv)) |
282 |
croak ("argument to Devel::FindRef::_refcnt must be a reference"); |
283 |
RETVAL = SvREFCNT (SvRV (rv)); |
284 |
OUTPUT: |
285 |
RETVAL |