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/* You may distribute under the terms of either the GNU General Public License |
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* or the Artistic License (the same terms as Perl itself) |
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* |
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* (C) Paul Evans, 2023 -- leonerd@leonerd.org.uk |
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*/ |
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#define PERL_NO_GET_CONTEXT |
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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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#include "XSParseSublike.h" |
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#define HAVE_PERL_VERSION(R, V, S) \ |
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(PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S)))))) |
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/* A horrible hack. We'll replace the op_ppaddr of the varop while leaving |
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* the rest of the op structure alone |
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*/ |
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static OP *pp_argelem_alias(pTHX) |
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{ |
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/* Much copypaste from bleadperl's pp_argelem in pp.c */ |
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SV ** padentry; |
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OP *o = PL_op; |
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AV *defav = GvAV(PL_defgv); /* @_ */ |
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IV ix = PTR2IV(cUNOP_AUXo->op_aux); |
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padentry = &(PAD_SVl(o->op_targ)); |
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save_clearsv(padentry); |
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SV **svp = av_fetch(defav, ix, FALSE); |
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*padentry = svp ? SvREFCNT_inc(*svp) : &PL_sv_undef; |
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return o->op_next; |
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} |
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static void apply_Alias(pTHX_ struct XPSSignatureParamContext *ctx, SV *attrvalue, void **attrdata_ptr, void *funcdata) |
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{ |
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PADNAME *pn = PadnamelistARRAY(PL_comppad_name)[ctx->padix]; |
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100
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if(PadnamePV(pn)[0] != '$') |
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croak("Can only apply the :Alias attribute to scalar parameters"); |
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100
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if(ctx->is_named) |
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croak("Cannot apply the :Alias attribute to a named parameter"); |
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} |
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static void post_defop_Alias(pTHX_ struct XPSSignatureParamContext *ctx, void *attrdata, void *funcdata) |
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{ |
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100
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if(ctx->defop) |
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1
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croak("Cannot apply the :Alias attribute to a parameter with a defaulting expression"); |
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OP *varop = ctx->varop; |
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assert(varop); |
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assert((varop->op_private & OPpARGELEM_MASK) == OPpARGELEM_SV); |
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assert(!(varop->op_flags & OPf_STACKED)); |
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varop->op_ppaddr = &pp_argelem_alias; |
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} |
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static const struct XPSSignatureAttributeFuncs funcs_Alias = { |
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.ver = XSPARSESUBLIKE_ABI_VERSION, |
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.permit_hintkey = "Signature::Attribute::Alias/Alias", |
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.apply = apply_Alias, |
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.post_defop = post_defop_Alias, |
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}; |
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MODULE = Signature::Attribute::Alias PACKAGE = Signature::Attribute::Alias |
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BOOT: |
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3
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boot_xs_parse_sublike(0.19); |
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register_xps_signature_attribute("Alias", &funcs_Alias, NULL); |