| 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 |
#define res_pair(text) \ |
| 20 |
do { \ |
| 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 (); \ |
| 32 |
av_push (av, newSVpv (form ("in the global %c%s::%.*s", sigil, \ |
| 33 |
HvNAME (GvSTASH (sv)), \ |
| 34 |
GvNAMELEN (sv), GvNAME (sv) ? GvNAME (sv) : "<anonymous>"), \ |
| 35 |
0)); \ |
| 36 |
av_push (about, newRV_noinc ((SV *)av)); \ |
| 37 |
} while (0) |
| 38 |
|
| 39 |
MODULE = Devel::FindRef PACKAGE = Devel::FindRef |
| 40 |
|
| 41 |
PROTOTYPES: ENABLE |
| 42 |
|
| 43 |
SV * |
| 44 |
ptr2ref (IV ptr) |
| 45 |
CODE: |
| 46 |
RETVAL = newRV_inc (INT2PTR (SV *, ptr)); |
| 47 |
OUTPUT: |
| 48 |
RETVAL |
| 49 |
|
| 50 |
void |
| 51 |
find_ (SV *target) |
| 52 |
PPCODE: |
| 53 |
{ |
| 54 |
SV *arena, *targ; |
| 55 |
U32 rmagical; |
| 56 |
int i; |
| 57 |
AV *about = newAV (); |
| 58 |
AV *excl = newAV (); |
| 59 |
|
| 60 |
if (!SvROK (target)) |
| 61 |
croak ("find expects a reference to a perl value"); |
| 62 |
|
| 63 |
targ = SvRV (target); |
| 64 |
|
| 65 |
for (arena = PL_sv_arenaroot; arena; arena = SvANY (arena)) |
| 66 |
{ |
| 67 |
UV idx = SvREFCNT (arena); |
| 68 |
|
| 69 |
/* Remember that the zeroth slot is used as the pointer onwards, so don't |
| 70 |
include it. */ |
| 71 |
while (--idx > 0) |
| 72 |
{ |
| 73 |
SV *sv = &arena [idx]; |
| 74 |
|
| 75 |
if (SvTYPE (sv) >= SVt_LAST) |
| 76 |
continue; |
| 77 |
|
| 78 |
/* temporarily disable RMAGICAL, it can easily interfere with us */ |
| 79 |
if ((rmagical = SvRMAGICAL (sv))) |
| 80 |
SvRMAGICAL_off (sv); |
| 81 |
|
| 82 |
if (SvTYPE (sv) >= SVt_PVMG) |
| 83 |
{ |
| 84 |
|
| 85 |
if (SvTYPE (sv) != SVt_PVMG || SvPAD_OUR (sv)) |
| 86 |
{ |
| 87 |
MAGIC *mg = SvMAGIC (sv); |
| 88 |
|
| 89 |
while (mg) |
| 90 |
{ |
| 91 |
if (mg->mg_obj == targ) |
| 92 |
res_pair (form ("referenced (in mg_obj) by '%c' type magic attached to", mg->mg_type)); |
| 93 |
|
| 94 |
if ((SV *)mg->mg_ptr == targ && mg->mg_flags & MGf_REFCOUNTED) |
| 95 |
res_pair (form ("referenced (in mg_ptr) by '%c' type magic attached to", mg->mg_type)); |
| 96 |
|
| 97 |
mg = mg->mg_moremagic; |
| 98 |
} |
| 99 |
} |
| 100 |
} |
| 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 |
|
| 185 |
if (rmagical) |
| 186 |
SvRMAGICAL_on (sv); |
| 187 |
} |
| 188 |
} |
| 189 |
|
| 190 |
EXTEND (SP, 2); |
| 191 |
PUSHs (sv_2mortal (newRV_noinc ((SV *)about))); |
| 192 |
PUSHs (sv_2mortal (newRV_noinc ((SV *)excl))); |
| 193 |
} |
| 194 |
|
