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#include "EXTERN.h" |
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#include "perl.h" |
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#include "XSUB.h" |
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|
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#define PERL_VERSION_ATLEAST(a,b,c) \ |
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(PERL_REVISION > (a) \ |
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|| (PERL_REVISION == (a) \ |
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&& (PERL_VERSION > (b) \ |
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|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c))))) |
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|
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#if !PERL_VERSION_ATLEAST (5,8,9) |
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# define SVt_LAST 16 |
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#endif |
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|
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#if !PERL_VERSION_ATLEAST (5,10,0) |
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# define SvPAD_OUR(dummy) 0 |
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#endif |
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|
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#define res_pair(text) \ |
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do { \ |
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AV *av = newAV (); \ |
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av_push (av, newSVpv (text, 0)); \ |
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if (rmagical) SvRMAGICAL_on (sv); \ |
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av_push (av, sv_rvweaken (newRV_inc (sv))); \ |
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if (rmagical) SvRMAGICAL_off (sv); \ |
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av_push (about, newRV_noinc ((SV *)av)); \ |
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} while (0) |
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|
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#define res_text(text) \ |
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do { \ |
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AV *av = newAV (); \ |
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av_push (av, newSVpv (text, 0)); \ |
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av_push (about, newRV_noinc ((SV *)av)); \ |
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} while (0) |
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|
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#define res_gv(sigil) \ |
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res_text (form ("in the global %c%s::%.*s", sigil, \ |
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HvNAME (GvSTASH (sv)), \ |
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GvNAMELEN (sv), \ |
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GvNAME (sv) ? GvNAME (sv) : "<anonymous>")) |
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|
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MODULE = Devel::FindRef PACKAGE = Devel::FindRef |
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|
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PROTOTYPES: ENABLE |
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|
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void |
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find_ (SV *target_ref) |
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PPCODE: |
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{ |
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SV *arena, *targ; |
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U32 rmagical; |
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int i; |
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AV *about = newAV (); |
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AV *excl = newAV (); |
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|
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if (!SvROK (target_ref)) |
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croak ("find expects a reference to a perl value"); |
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|
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targ = SvRV (target_ref); |
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|
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if (SvIMMORTAL (targ)) |
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{ |
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if (targ == &PL_sv_undef) |
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res_text ("the immortal 'undef' value"); |
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else if (targ == &PL_sv_yes) |
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res_text ("the immortal 'yes' value"); |
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else if (targ == &PL_sv_no) |
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res_text ("the immortal 'no' value"); |
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else if (targ == &PL_sv_placeholder) |
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res_text ("the immortal placeholder value"); |
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else |
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res_text ("some unknown immortal"); |
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} |
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else |
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{ |
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for (arena = PL_sv_arenaroot; arena; arena = SvANY (arena)) |
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{ |
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UV idx = SvREFCNT (arena); |
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|
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/* Remember that the zeroth slot is used as the pointer onwards, so don't |
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include it. */ |
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while (--idx > 0) |
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{ |
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SV *sv = &arena [idx]; |
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|
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if (SvTYPE (sv) >= SVt_LAST) |
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continue; |
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|
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/* temporarily disable RMAGICAL, it can easily interfere with us */ |
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if ((rmagical = SvRMAGICAL (sv))) |
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SvRMAGICAL_off (sv); |
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|
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if (SvTYPE (sv) >= SVt_PVMG) |
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{ |
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if (SvTYPE (sv) == SVt_PVMG && SvPAD_OUR (sv)) |
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{ |
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/* I have no clue what this is */ |
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/* maybe some placeholder for our variables for eval? */ |
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/* it doesn't seem to reference anything, so we should be able to ignore it */ |
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} |
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else |
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{ |
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MAGIC *mg = SvMAGIC (sv); |
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|
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while (mg) |
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{ |
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if (mg->mg_obj == targ && mg->mg_flags & MGf_REFCOUNTED) |
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res_pair (form ("referenced (in mg_obj) by '%c' type magic attached to", mg->mg_type)); |
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|
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if ((SV *)mg->mg_ptr == targ) |
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res_pair (form ("%sreferenced (in mg_ptr) by '%c' type magic attached to", |
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mg->mg_len == HEf_SVKEY ? "" : "possibly ", |
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mg->mg_type)); |
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|
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mg = mg->mg_moremagic; |
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} |
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} |
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} |
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|
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if (SvROK (sv)) |
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{ |
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if (SvRV (sv) == targ && !SvWEAKREF (sv) && sv != target_ref) |
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res_pair ("referenced by"); |
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} |
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else |
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switch (SvTYPE (sv)) |
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{ |
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case SVt_PVAV: |
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if (AvREAL (sv)) |
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for (i = AvFILLp (sv) + 1; i--; ) |
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if (AvARRAY (sv)[i] == targ) |
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res_pair (form ("in array element %d of", i)); |
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|
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break; |
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|
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case SVt_PVHV: |
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if (hv_iterinit ((HV *)sv)) |
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{ |
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HE *he; |
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|
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while ((he = hv_iternext ((HV *)sv))) |
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if (HeVAL (he) == targ) |
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res_pair (form ("in the member '%.*s' of", HeKLEN (he), HeKEY (he))); |
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} |
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|
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break; |
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|
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case SVt_PVCV: |
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{ |
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int depth = CvDEPTH (sv); |
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|
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/* Anonymous subs have a padlist but zero depth */ |
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if (CvANON (sv) && !depth && CvPADLIST (sv)) |
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depth = 1; |
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|
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if (depth) |
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{ |
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AV *padlist = CvPADLIST (sv); |
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|
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while (depth) |
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{ |
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AV *pad = (AV *)AvARRAY (padlist)[depth]; |
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|
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av_push (excl, newSVuv (PTR2UV (pad))); /* exclude pads themselves from being found */ |
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|
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/* The 0th pad slot is @_ */ |
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if (AvARRAY (pad)[0] == targ) |
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res_pair ("the argument array for"); |
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|
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for (i = AvFILLp (pad) + 1; --i; ) |
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if (AvARRAY (pad)[i] == targ) |
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{ |
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/* Values from constant functions are stored in the pad without any name */ |
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SV *name_sv = AvARRAY (AvARRAY (padlist)[0])[i]; |
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|
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if (name_sv && SvPOK (name_sv)) |
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res_pair (form ("in the lexical '%s' in", SvPVX (name_sv))); |
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else |
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res_pair ("in an unnamed lexical in"); |
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} |
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|
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--depth; |
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} |
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} |
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|
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if (CvCONST (sv) && (SV*)CvXSUBANY (sv).any_ptr == targ) |
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res_pair ("the constant value of"); |
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|
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if (!CvWEAKOUTSIDE (sv) && (SV*)CvOUTSIDE (sv) == targ) |
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res_pair ("the containing scope for"); |
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|
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if (sv == targ && CvANON (sv)) |
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if (CvSTART (sv) |
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&& CvSTART (sv)->op_type == OP_NEXTSTATE |
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&& CopLINE ((COP *)CvSTART (sv))) |
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res_text (form ("the closure created at %s:%d", |
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CopFILE ((COP *)CvSTART (sv)) ? CopFILE ((COP *)CvSTART (sv)) : "<unknown>", |
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CopLINE ((COP *)CvSTART (sv)))); |
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else |
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res_text (form ("the closure created somewhere in file %s (PLEASE REPORT!)", |
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CvFILE (sv) ? CvFILE (sv) : "<unknown>")); |
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} |
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|
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break; |
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|
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case SVt_PVGV: |
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if (GvGP (sv)) |
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{ |
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if (GvSV (sv) == (SV *)targ) res_gv ('$'); |
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if (GvAV (sv) == (AV *)targ) res_gv ('@'); |
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if (GvHV (sv) == (HV *)targ) res_gv ('%'); |
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if (GvCV (sv) == (CV *)targ) res_gv ('&'); |
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} |
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|
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break; |
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|
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case SVt_PVLV: |
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if (LvTARG (sv) == targ) |
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{ |
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if (LvTYPE (sv) == 'y') |
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{ |
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MAGIC *mg = mg_find (sv, PERL_MAGIC_defelem); |
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|
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if (mg && mg->mg_obj) |
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res_pair (form ("the target for the lvalue hash element '%.*s',", |
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SvCUR (mg->mg_obj), SvPV_nolen (mg->mg_obj))); |
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else |
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res_pair (form ("the target for the lvalue array element #%d,", LvTARGOFF (sv))); |
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} |
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else |
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res_pair (form ("an lvalue reference target (type '%c', ofs %d, len %d),", |
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LvTYPE (sv), LvTARGOFF (sv), LvTARGLEN (sv))); |
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} |
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|
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break; |
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} |
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|
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if (rmagical) |
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SvRMAGICAL_on (sv); |
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} |
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} |
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|
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/* look at the mortalise stack of the current coroutine */ |
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for (i = 0; i <= PL_tmps_ix; ++i) |
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if (PL_tmps_stack [i] == targ) |
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res_text ("a temporary on the stack"); |
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|
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if (targ == (SV*)PL_main_cv) |
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res_text ("the main body of the program"); |
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} |
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|
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EXTEND (SP, 2); |
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PUSHs (sv_2mortal (newRV_noinc ((SV *)about))); |
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PUSHs (sv_2mortal (newRV_noinc ((SV *)excl))); |
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} |
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|
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SV * |
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ptr2ref (UV ptr) |
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CODE: |
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RETVAL = newRV_inc (INT2PTR (SV *, ptr)); |
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OUTPUT: |
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RETVAL |
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|
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UV |
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ref2ptr (SV *rv) |
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CODE: |
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if (!SvROK (rv)) |
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croak ("argument to Devel::FindRef::ref2ptr must be a reference"); |
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RETVAL = PTR2UV (SvRV (rv)); |
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OUTPUT: |
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RETVAL |
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|
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U32 |
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_refcnt (SV *rv) |
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CODE: |
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if (!SvROK (rv)) |
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croak ("argument to Devel::FindRef::_refcnt must be a reference"); |
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RETVAL = SvREFCNT (SvRV (rv)); |
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OUTPUT: |
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RETVAL |
