1 /* This file is part of the Lexical-Types Perl module.
2 * See http://search.cpan.org/dist/Lexical-Types/ */
4 #define PERL_NO_GET_CONTEXT
9 #define __PACKAGE__ "Lexical::Types"
10 #define __PACKAGE_LEN__ (sizeof(__PACKAGE__)-1)
12 /* --- Compatibility wrappers ---------------------------------------------- */
14 #define LT_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
16 #if LT_HAS_PERL(5, 10, 0) || defined(PL_parser)
17 # ifndef PL_in_my_stash
18 # define PL_in_my_stash PL_parser->in_my_stash
21 # ifndef PL_in_my_stash
22 # define PL_in_my_stash PL_Iin_my_stash
27 # define HvNAME_get(H) HvNAME(H)
31 # define HvNAMELEN_get(H) strlen(HvNAME_get(H))
34 /* --- Helpers ------------------------------------------------------------- */
36 /* ... Hints ............................................................... */
38 STATIC U32 lt_hash = 0;
40 STATIC SV *lt_hint(pTHX) {
41 #define lt_hint() lt_hint(aTHX)
43 #if LT_HAS_PERL(5, 10, 0)
44 id = Perl_refcounted_he_fetch(aTHX_ PL_curcop->cop_hints_hash,
46 __PACKAGE__, __PACKAGE_LEN__,
50 SV **val = hv_fetch(GvHV(PL_hintgv), __PACKAGE__, __PACKAGE_LEN__, lt_hash);
55 return (id && SvOK(id)) ? id : NULL;
58 /* ... op => info map ...................................................... */
60 #define PTABLE_VAL_FREE(V) PerlMemShared_free(V)
64 STATIC ptable *lt_op_map = NULL;
67 STATIC perl_mutex lt_op_map_mutex;
74 OP *(*pp_padsv)(pTHX);
77 STATIC void lt_map_store(pPTABLE_ const OP *o, SV *orig_pkg, SV *type_pkg, SV *type_meth, OP *(*pp_padsv)(pTHX)) {
78 #define lt_map_store(O, OP, TP, TM, PP) lt_map_store(aPTABLE_ (O), (OP), (TP), (TM), (PP))
82 MUTEX_LOCK(<_op_map_mutex);
85 if (!(oi = ptable_fetch(lt_op_map, o))) {
86 oi = PerlMemShared_malloc(sizeof *oi);
87 ptable_store(lt_op_map, o, oi);
90 oi->orig_pkg = orig_pkg;
91 oi->type_pkg = type_pkg;
92 oi->type_meth = type_meth;
93 oi->pp_padsv = pp_padsv;
96 MUTEX_UNLOCK(<_op_map_mutex);
100 STATIC const lt_op_info *lt_map_fetch(const OP *o, lt_op_info *oi) {
101 const lt_op_info *val;
104 MUTEX_LOCK(<_op_map_mutex);
107 val = ptable_fetch(lt_op_map, o);
114 MUTEX_UNLOCK(<_op_map_mutex);
120 /* --- Hooks --------------------------------------------------------------- */
122 /* ... Our pp_padsv ........................................................ */
124 STATIC OP *lt_pp_padsv(pTHX) {
127 if ((PL_op->op_private & OPpLVAL_INTRO) && lt_map_fetch(PL_op, &oi)) {
128 PADOFFSET targ = PL_op->op_targ;
129 SV *sv = PAD_SVl(targ);
145 items = call_sv(oi.type_meth, G_ARRAY | G_METHOD);
155 croak("Typed scalar initializer method should return zero or one scalar, but got %d", items);
163 return CALL_FPTR(oi.pp_padsv)(aTHX);
166 return CALL_FPTR(PL_ppaddr[OP_PADSV])(aTHX);
169 STATIC OP *(*lt_pp_padsv_saved)(pTHX) = 0;
171 STATIC void lt_pp_padsv_save(void) {
172 if (lt_pp_padsv_saved)
175 lt_pp_padsv_saved = PL_ppaddr[OP_PADSV];
176 PL_ppaddr[OP_PADSV] = lt_pp_padsv;
179 STATIC void lt_pp_padsv_restore(OP *o) {
180 if (!lt_pp_padsv_saved)
183 if (o->op_ppaddr == lt_pp_padsv)
184 o->op_ppaddr = lt_pp_padsv_saved;
186 PL_ppaddr[OP_PADSV] = lt_pp_padsv_saved;
187 lt_pp_padsv_saved = 0;
190 /* ... Our ck_pad{any,sv} .................................................. */
192 /* Sadly, the PADSV OPs we are interested in don't trigger the padsv check
193 * function, but are instead manually mutated from a PADANY. This is why we set
194 * PL_ppaddr[OP_PADSV] in the padany check function so that PADSV OPs will have
195 * their pp_ppaddr set to our pp_padsv. PL_ppaddr[OP_PADSV] is then reset at the
196 * beginning of every ck_pad{any,sv}. Some unwanted OPs can still call our
197 * pp_padsv, but much less than if we would have set PL_ppaddr[OP_PADSV]
200 STATIC SV *lt_default_meth = NULL;
202 STATIC OP *(*lt_old_ck_padany)(pTHX_ OP *) = 0;
204 STATIC OP *lt_ck_padany(pTHX_ OP *o) {
208 lt_pp_padsv_restore(o);
210 o = CALL_FPTR(lt_old_ck_padany)(aTHX_ o);
212 stash = PL_in_my_stash;
213 if (stash && (hint = lt_hint())) {
214 SV *orig_pkg = newSVpvn(HvNAME_get(stash), HvNAMELEN_get(stash));
215 SV *orig_meth = lt_default_meth;
217 SV *type_meth = NULL;
218 SV *code = INT2PTR(SV *, SvUVX(hint));
220 SvREADONLY_on(orig_pkg);
235 items = call_sv(code, G_ARRAY);
239 croak(__PACKAGE__ " mangler should return zero, one or two scalars, but got %d", items);
241 SvREFCNT_dec(orig_pkg);
248 type_meth = newSVsv(rsv);
249 SvREADONLY_on(type_meth);
254 type_pkg = newSVsv(rsv);
255 SvREADONLY_on(type_pkg);
266 SvREFCNT_inc(orig_pkg);
270 type_meth = orig_meth;
271 SvREFCNT_inc(orig_meth);
276 lt_map_store(o, orig_pkg, type_pkg, type_meth, lt_pp_padsv_saved);
283 STATIC OP *(*lt_old_ck_padsv)(pTHX_ OP *) = 0;
285 STATIC OP *lt_ck_padsv(pTHX_ OP *o) {
286 lt_pp_padsv_restore(o);
288 return CALL_FPTR(lt_old_ck_padsv)(aTHX_ o);
291 STATIC U32 lt_initialized = 0;
293 /* --- XS ------------------------------------------------------------------ */
295 MODULE = Lexical::Types PACKAGE = Lexical::Types
301 if (!lt_initialized++) {
302 lt_op_map = ptable_new();
304 MUTEX_INIT(<_op_map_mutex);
307 lt_default_meth = newSVpvn("TYPEDSCALAR", 11);
308 SvREADONLY_on(lt_default_meth);
310 PERL_HASH(lt_hash, __PACKAGE__, __PACKAGE_LEN__);
312 lt_old_ck_padany = PL_check[OP_PADANY];
313 PL_check[OP_PADANY] = MEMBER_TO_FPTR(lt_ck_padany);
314 lt_old_ck_padsv = PL_check[OP_PADSV];
315 PL_check[OP_PADSV] = MEMBER_TO_FPTR(lt_ck_padsv);
323 if (SvOK(ref) && SvROK(ref)) {
326 ret = newSVuv(PTR2UV(sv));