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 Newx(v, n, c) New(0, v, n, c)
31 # define HvNAME_get(H) HvNAME(H)
35 # define HvNAMELEN_get(H) strlen(HvNAME_get(H))
38 /* --- Helpers ------------------------------------------------------------- */
40 /* ... Hints ............................................................... */
42 STATIC U32 lt_hash = 0;
44 STATIC SV *lt_hint(pTHX) {
45 #define lt_hint() lt_hint(aTHX)
47 #if LT_HAS_PERL(5, 10, 0)
48 id = Perl_refcounted_he_fetch(aTHX_ PL_curcop->cop_hints_hash,
50 __PACKAGE__, __PACKAGE_LEN__,
54 SV **val = hv_fetch(GvHV(PL_hintgv), __PACKAGE__, __PACKAGE_LEN__, lt_hash);
59 return (id && SvOK(id)) ? id : NULL;
62 /* ... op => info map ...................................................... */
64 #define PTABLE_VAL_FREE(V) PerlMemShared_free(V)
68 STATIC ptable *lt_op_map = NULL;
71 STATIC perl_mutex lt_op_map_mutex;
78 OP *(*pp_padsv)(pTHX);
81 STATIC void lt_map_store(const OP *o, SV *orig_pkg, SV *type_pkg, SV *type_meth, OP *(*pp_padsv)(pTHX)) {
85 MUTEX_LOCK(<_op_map_mutex);
88 if (!(oi = ptable_fetch(lt_op_map, o))) {
89 oi = PerlMemShared_malloc(sizeof *oi);
90 ptable_store(lt_op_map, o, oi);
93 oi->orig_pkg = orig_pkg;
94 oi->type_pkg = type_pkg;
95 oi->type_meth = type_meth;
96 oi->pp_padsv = pp_padsv;
99 MUTEX_UNLOCK(<_op_map_mutex);
103 STATIC const lt_op_info *lt_map_fetch(const OP *o, lt_op_info *oi) {
104 const lt_op_info *val;
107 MUTEX_LOCK(<_op_map_mutex);
110 val = ptable_fetch(lt_op_map, o);
117 MUTEX_UNLOCK(<_op_map_mutex);
123 /* --- Hooks --------------------------------------------------------------- */
125 /* ... Our pp_padsv ........................................................ */
127 STATIC OP *lt_pp_padsv(pTHX) {
130 if ((PL_op->op_private & OPpLVAL_INTRO) && lt_map_fetch(PL_op, &oi)) {
131 PADOFFSET targ = PL_op->op_targ;
132 SV *sv = PAD_SVl(targ);
148 items = call_sv(oi.type_meth, G_ARRAY | G_METHOD);
158 croak("Typed scalar initializer method should return zero or one scalar, but got %d", items);
166 return CALL_FPTR(oi.pp_padsv)(aTHX);
169 return CALL_FPTR(PL_ppaddr[OP_PADSV])(aTHX);
172 STATIC OP *(*lt_pp_padsv_saved)(pTHX) = 0;
174 STATIC void lt_pp_padsv_save(void) {
175 if (lt_pp_padsv_saved)
178 lt_pp_padsv_saved = PL_ppaddr[OP_PADSV];
179 PL_ppaddr[OP_PADSV] = lt_pp_padsv;
182 STATIC void lt_pp_padsv_restore(OP *o) {
183 if (!lt_pp_padsv_saved)
186 if (o->op_ppaddr == lt_pp_padsv)
187 o->op_ppaddr = lt_pp_padsv_saved;
189 PL_ppaddr[OP_PADSV] = lt_pp_padsv_saved;
190 lt_pp_padsv_saved = 0;
193 /* ... Our ck_pad{any,sv} .................................................. */
195 /* Sadly, the PADSV OPs we are interested in don't trigger the padsv check
196 * function, but are instead manually mutated from a PADANY. This is why we set
197 * PL_ppaddr[OP_PADSV] in the padany check function so that PADSV OPs will have
198 * their pp_ppaddr set to our pp_padsv. PL_ppaddr[OP_PADSV] is then reset at the
199 * beginning of every ck_pad{any,sv}. Some unwanted OPs can still call our
200 * pp_padsv, but much less than if we would have set PL_ppaddr[OP_PADSV]
203 STATIC SV *lt_default_meth = NULL;
205 STATIC OP *(*lt_old_ck_padany)(pTHX_ OP *) = 0;
207 STATIC OP *lt_ck_padany(pTHX_ OP *o) {
211 lt_pp_padsv_restore(o);
213 o = CALL_FPTR(lt_old_ck_padany)(aTHX_ o);
215 stash = PL_in_my_stash;
216 if (stash && (hint = lt_hint())) {
217 SV *orig_pkg = newSVpvn(HvNAME_get(stash), HvNAMELEN_get(stash));
218 SV *orig_meth = lt_default_meth;
220 SV *type_meth = NULL;
221 SV *code = INT2PTR(SV *, SvUVX(hint));
223 SvREADONLY_on(orig_pkg);
238 items = call_sv(code, G_ARRAY);
242 croak(__PACKAGE__ " mangler should return zero, one or two scalars, but got %d", items);
244 SvREFCNT_dec(orig_pkg);
251 type_meth = newSVsv(rsv);
252 SvREADONLY_on(type_meth);
257 type_pkg = newSVsv(rsv);
258 SvREADONLY_on(type_pkg);
269 SvREFCNT_inc(orig_pkg);
273 type_meth = orig_meth;
274 SvREFCNT_inc(orig_meth);
279 lt_map_store(o, orig_pkg, type_pkg, type_meth, lt_pp_padsv_saved);
286 STATIC OP *(*lt_old_ck_padsv)(pTHX_ OP *) = 0;
288 STATIC OP *lt_ck_padsv(pTHX_ OP *o) {
289 lt_pp_padsv_restore(o);
291 return CALL_FPTR(lt_old_ck_padsv)(aTHX_ o);
294 STATIC U32 lt_initialized = 0;
296 /* --- XS ------------------------------------------------------------------ */
298 MODULE = Lexical::Types PACKAGE = Lexical::Types
304 if (!lt_initialized++) {
305 lt_op_map = ptable_new();
307 MUTEX_INIT(<_op_map_mutex);
310 lt_default_meth = newSVpvn("TYPEDSCALAR", 11);
311 SvREADONLY_on(lt_default_meth);
313 PERL_HASH(lt_hash, __PACKAGE__, __PACKAGE_LEN__);
315 lt_old_ck_padany = PL_check[OP_PADANY];
316 PL_check[OP_PADANY] = MEMBER_TO_FPTR(lt_ck_padany);
317 lt_old_ck_padsv = PL_check[OP_PADSV];
318 PL_check[OP_PADSV] = MEMBER_TO_FPTR(lt_ck_padsv);
326 if (SvOK(ref) && SvROK(ref)) {
329 ret = newSVuv(PTR2UV(sv));