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(const OP *o, SV *orig_pkg, SV *type_pkg, SV *type_meth, OP *(*pp_padsv)(pTHX)) {
81 MUTEX_LOCK(<_op_map_mutex);
84 if (!(oi = ptable_fetch(lt_op_map, o))) {
85 oi = PerlMemShared_malloc(sizeof *oi);
86 ptable_store(lt_op_map, o, oi);
89 oi->orig_pkg = orig_pkg;
90 oi->type_pkg = type_pkg;
91 oi->type_meth = type_meth;
92 oi->pp_padsv = pp_padsv;
95 MUTEX_UNLOCK(<_op_map_mutex);
99 STATIC const lt_op_info *lt_map_fetch(const OP *o, lt_op_info *oi) {
100 const lt_op_info *val;
103 MUTEX_LOCK(<_op_map_mutex);
106 val = ptable_fetch(lt_op_map, o);
113 MUTEX_UNLOCK(<_op_map_mutex);
119 /* --- Hooks --------------------------------------------------------------- */
121 /* ... Our pp_padsv ........................................................ */
123 STATIC OP *lt_pp_padsv(pTHX) {
126 if ((PL_op->op_private & OPpLVAL_INTRO) && lt_map_fetch(PL_op, &oi)) {
127 PADOFFSET targ = PL_op->op_targ;
128 SV *sv = PAD_SVl(targ);
144 items = call_sv(oi.type_meth, G_ARRAY | G_METHOD);
154 croak("Typed scalar initializer method should return zero or one scalar, but got %d", items);
162 return CALL_FPTR(oi.pp_padsv)(aTHX);
165 return CALL_FPTR(PL_ppaddr[OP_PADSV])(aTHX);
168 STATIC OP *(*lt_pp_padsv_saved)(pTHX) = 0;
170 STATIC void lt_pp_padsv_save(void) {
171 if (lt_pp_padsv_saved)
174 lt_pp_padsv_saved = PL_ppaddr[OP_PADSV];
175 PL_ppaddr[OP_PADSV] = lt_pp_padsv;
178 STATIC void lt_pp_padsv_restore(OP *o) {
179 if (!lt_pp_padsv_saved)
182 if (o->op_ppaddr == lt_pp_padsv)
183 o->op_ppaddr = lt_pp_padsv_saved;
185 PL_ppaddr[OP_PADSV] = lt_pp_padsv_saved;
186 lt_pp_padsv_saved = 0;
189 /* ... Our ck_pad{any,sv} .................................................. */
191 /* Sadly, the PADSV OPs we are interested in don't trigger the padsv check
192 * function, but are instead manually mutated from a PADANY. This is why we set
193 * PL_ppaddr[OP_PADSV] in the padany check function so that PADSV OPs will have
194 * their pp_ppaddr set to our pp_padsv. PL_ppaddr[OP_PADSV] is then reset at the
195 * beginning of every ck_pad{any,sv}. Some unwanted OPs can still call our
196 * pp_padsv, but much less than if we would have set PL_ppaddr[OP_PADSV]
199 STATIC SV *lt_default_meth = NULL;
201 STATIC OP *(*lt_old_ck_padany)(pTHX_ OP *) = 0;
203 STATIC OP *lt_ck_padany(pTHX_ OP *o) {
207 lt_pp_padsv_restore(o);
209 o = CALL_FPTR(lt_old_ck_padany)(aTHX_ o);
211 stash = PL_in_my_stash;
212 if (stash && (hint = lt_hint())) {
213 SV *orig_pkg = newSVpvn(HvNAME_get(stash), HvNAMELEN_get(stash));
214 SV *orig_meth = lt_default_meth;
216 SV *type_meth = NULL;
217 SV *code = INT2PTR(SV *, SvUVX(hint));
219 SvREADONLY_on(orig_pkg);
234 items = call_sv(code, G_ARRAY);
238 croak(__PACKAGE__ " mangler should return zero, one or two scalars, but got %d", items);
240 SvREFCNT_dec(orig_pkg);
247 type_meth = newSVsv(rsv);
248 SvREADONLY_on(type_meth);
253 type_pkg = newSVsv(rsv);
254 SvREADONLY_on(type_pkg);
265 SvREFCNT_inc(orig_pkg);
269 type_meth = orig_meth;
270 SvREFCNT_inc(orig_meth);
275 lt_map_store(o, orig_pkg, type_pkg, type_meth, lt_pp_padsv_saved);
282 STATIC OP *(*lt_old_ck_padsv)(pTHX_ OP *) = 0;
284 STATIC OP *lt_ck_padsv(pTHX_ OP *o) {
285 lt_pp_padsv_restore(o);
287 return CALL_FPTR(lt_old_ck_padsv)(aTHX_ o);
290 STATIC U32 lt_initialized = 0;
292 /* --- XS ------------------------------------------------------------------ */
294 MODULE = Lexical::Types PACKAGE = Lexical::Types
300 if (!lt_initialized++) {
301 lt_op_map = ptable_new();
303 MUTEX_INIT(<_op_map_mutex);
306 lt_default_meth = newSVpvn("TYPEDSCALAR", 11);
307 SvREADONLY_on(lt_default_meth);
309 PERL_HASH(lt_hash, __PACKAGE__, __PACKAGE_LEN__);
311 lt_old_ck_padany = PL_check[OP_PADANY];
312 PL_check[OP_PADANY] = MEMBER_TO_FPTR(lt_ck_padany);
313 lt_old_ck_padsv = PL_check[OP_PADSV];
314 PL_check[OP_PADSV] = MEMBER_TO_FPTR(lt_ck_padsv);
322 if (SvOK(ref) && SvROK(ref)) {
325 ret = newSVuv(PTR2UV(sv));