Parameters.xs

   1 /*
   2 Copyright 2012 Lukas Mai.
   3
   4 This program is free software; you can redistribute it and/or modify it
   5 under the terms of either: the GNU General Public License as published
   6 by the Free Software Foundation; or the Artistic License.
   7
   8 See http://dev.perl.org/licenses/ for more information.
   9  */
  10
  11 #ifdef __GNUC__
  12  #if (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) || __GNUC__ >= 5
  13   #define PRAGMA_GCC_(X) _Pragma(#X)
  14   #define PRAGMA_GCC(X) PRAGMA_GCC_(GCC X)
  15  #endif
  16 #endif
  17
  18 #ifndef PRAGMA_GCC
  19  #define PRAGMA_GCC(X)
  20 #endif
  21
  22 #ifdef DEVEL
  23  #define WARNINGS_RESET PRAGMA_GCC(diagnostic pop)
  24  #define WARNINGS_ENABLEW(X) PRAGMA_GCC(diagnostic warning #X)
  25  #define WARNINGS_ENABLE \
  26         WARNINGS_ENABLEW(-Wall) \
  27         WARNINGS_ENABLEW(-Wextra) \
  28         WARNINGS_ENABLEW(-Wundef) \
  29         /* WARNINGS_ENABLEW(-Wshadow) :-( */ \
  30         WARNINGS_ENABLEW(-Wbad-function-cast) \
  31         WARNINGS_ENABLEW(-Wcast-align) \
  32         WARNINGS_ENABLEW(-Wwrite-strings) \
  33         /* WARNINGS_ENABLEW(-Wnested-externs) wtf? */ \
  34         WARNINGS_ENABLEW(-Wstrict-prototypes) \
  35         WARNINGS_ENABLEW(-Wmissing-prototypes) \
  36         WARNINGS_ENABLEW(-Winline) \
  37         WARNINGS_ENABLEW(-Wdisabled-optimization)
  38
  39 #else
  40  #define WARNINGS_RESET
  41  #define WARNINGS_ENABLE
  42 #endif
  43
  44
  45 #define PERL_NO_GET_CONTEXT
  46 #include "EXTERN.h"
  47 #include "perl.h"
  48 #include "XSUB.h"
  49
  50 #include <string.h>
  51
  52
  53 WARNINGS_ENABLE
  54
  55
  56 #define HAVE_PERL_VERSION(R, V, S) \
  57         (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
  58
  59 #if HAVE_PERL_VERSION(5, 16, 0)
  60  #define IF_HAVE_PERL_5_16(YES, NO) YES
  61 #else
  62  #define IF_HAVE_PERL_5_16(YES, NO) NO
  63 #endif
  64
  65 #if 0
  66  #if HAVE_PERL_VERSION(5, 17, 6)
  67   #error "internal error: missing definition of KEY_my (your perl is too new)"
  68  #elif HAVE_PERL_VERSION(5, 15, 8)
  69   #define S_KEY_my 134
  70  #elif HAVE_PERL_VERSION(5, 15, 6)
  71   #define S_KEY_my 133
  72  #elif HAVE_PERL_VERSION(5, 15, 5)
  73   #define S_KEY_my 132
  74  #elif HAVE_PERL_VERSION(5, 13, 0)
  75   #define S_KEY_my 131
  76  #else
  77   #error "internal error: missing definition of KEY_my (your perl is too old)"
  78  #endif
  79 #endif
  80
  81
  82 #define MY_PKG "Function::Parameters"
  83
  84 #define HINTK_KEYWORDS MY_PKG "/keywords"
  85 #define HINTK_FLAGS_   MY_PKG "/flags:"
  86 #define HINTK_SHIFT_   MY_PKG "/shift:"
  87 #define HINTK_ATTRS_   MY_PKG "/attrs:"
  88
  89 #define DEFSTRUCT(T) typedef struct T T; struct T
  90
  91 #define UV_BITS (sizeof (UV) * CHAR_BIT)
  92
  93 enum {
  94         FLAG_NAME_OK      = 0x01,
  95         FLAG_ANON_OK      = 0x02,
  96         FLAG_DEFAULT_ARGS = 0x04,
  97         FLAG_CHECK_NARGS  = 0x08,
  98         FLAG_INVOCANT     = 0x10,
  99         FLAG_NAMED_PARAMS = 0x20,
 100         FLAG_TYPES_OK     = 0x40,
 101         FLAG_CHECK_TARGS  = 0x80
 102 };
 103
 104 DEFSTRUCT(KWSpec) {
 105         unsigned flags;
 106         SV *shift;
 107         SV *attrs;
 108 };
 109
 110 static int (*next_keyword_plugin)(pTHX_ char *, STRLEN, OP **);
 111
 112 DEFSTRUCT(Resource) {
 113         Resource *next;
 114         void *data;
 115         void (*destroy)(pTHX_ void *);
 116 };
 117
 118 typedef Resource *Sentinel[1];
 119
 120 static void sentinel_clear_void(pTHX_ void *p) {
 121         Resource **pp = p;
 122         while (*pp) {
 123                 Resource *cur = *pp;
 124                 if (cur->destroy) {
 125                         cur->destroy(aTHX_ cur->data);
 126                 }
 127                 cur->data = (void *)"no";
 128                 cur->destroy = NULL;
 129                 *pp = cur->next;
 130                 Safefree(cur);
 131         }
 132 }
 133
 134 static Resource *sentinel_register(Sentinel sen, void *data, void (*destroy)(pTHX_ void *)) {
 135         Resource *cur;
 136
 137         Newx(cur, 1, Resource);
 138         cur->data = data;
 139         cur->destroy = destroy;
 140         cur->next = *sen;
 141         *sen = cur;
 142
 143         return cur;
 144 }
 145
 146 static void sentinel_disarm(Resource *p) {
 147         p->destroy = NULL;
 148 }
 149
 150 static void my_sv_refcnt_dec_void(pTHX_ void *p) {
 151         SV *sv = p;
 152         SvREFCNT_dec(sv);
 153 }
 154
 155 static SV *sentinel_mortalize(Sentinel sen, SV *sv) {
 156         sentinel_register(sen, sv, my_sv_refcnt_dec_void);
 157         return sv;
 158 }
 159
 160 static int kw_flags(pTHX_ Sentinel sen, const char *kw_ptr, STRLEN kw_len, KWSpec *spec) {
 161         HV *hints;
 162         SV *sv, **psv;
 163         const char *p, *kw_active;
 164         STRLEN kw_active_len;
 165
 166         spec->flags = 0;
 167         spec->shift = sentinel_mortalize(sen, newSVpvs(""));
 168         spec->attrs = sentinel_mortalize(sen, newSVpvs(""));
 169
 170         if (!(hints = GvHV(PL_hintgv))) {
 171                 return FALSE;
 172         }
 173         if (!(psv = hv_fetchs(hints, HINTK_KEYWORDS, 0))) {
 174                 return FALSE;
 175         }
 176         sv = *psv;
 177         kw_active = SvPV(sv, kw_active_len);
 178         if (kw_active_len <= kw_len) {
 179                 return FALSE;
 180         }
 181         for (
 182                 p = kw_active;
 183                 (p = strchr(p, *kw_ptr)) &&
 184                 p < kw_active + kw_active_len - kw_len;
 185                 p++
 186         ) {
 187                 if (
 188                         (p == kw_active || p[-1] == ' ') &&
 189                         p[kw_len] == ' ' &&
 190                         memcmp(kw_ptr, p, kw_len) == 0
 191                 ) {
 192
 193 #define FETCH_HINTK_INTO(NAME, PTR, LEN, X) STMT_START { \
 194         const char *fk_ptr_; \
 195         STRLEN fk_len_; \
 196         SV *fk_sv_; \
 197         fk_sv_ = sentinel_mortalize(sen, newSVpvs(HINTK_ ## NAME)); \
 198         sv_catpvn(fk_sv_, PTR, LEN); \
 199         fk_ptr_ = SvPV(fk_sv_, fk_len_); \
 200         if (!((X) = hv_fetch(hints, fk_ptr_, fk_len_, 0))) { \
 201                 croak("%s: internal error: $^H{'%.*s'} not set", MY_PKG, (int)fk_len_, fk_ptr_); \
 202         } \
 203 } STMT_END
 204
 205                         FETCH_HINTK_INTO(FLAGS_, kw_ptr, kw_len, psv);
 206                         spec->flags = SvIV(*psv);
 207
 208                         FETCH_HINTK_INTO(SHIFT_, kw_ptr, kw_len, psv);
 209                         SvSetSV(spec->shift, *psv);
 210
 211                         FETCH_HINTK_INTO(ATTRS_, kw_ptr, kw_len, psv);
 212                         SvSetSV(spec->attrs, *psv);
 213
 214 #undef FETCH_HINTK_INTO
 215                         return TRUE;
 216                 }
 217         }
 218         return FALSE;
 219 }
 220
 221
 222 static void free_ptr_op_void(pTHX_ void *vp) {
 223         OP **pp = vp;
 224         op_free(*pp);
 225         Safefree(pp);
 226 }
 227
 228 static void free_op_void(pTHX_ void *vp) {
 229         OP *p = vp;
 230         op_free(p);
 231 }
 232
 233 #define sv_eq_pvs(SV, S) my_sv_eq_pvn(aTHX_ SV, "" S "", sizeof (S) - 1)
 234
 235 static int my_sv_eq_pvn(pTHX_ SV *sv, const char *p, STRLEN n) {
 236         STRLEN sv_len;
 237         const char *sv_p = SvPV(sv, sv_len);
 238         return memcmp(sv_p, p, n) == 0;
 239 }
 240
 241
 242 #include "padop_on_crack.c.inc"
 243
 244
 245 enum {
 246         MY_ATTR_LVALUE = 0x01,
 247         MY_ATTR_METHOD = 0x02,
 248         MY_ATTR_SPECIAL = 0x04
 249 };
 250
 251 static void my_sv_cat_c(pTHX_ SV *sv, U32 c) {
 252         char ds[UTF8_MAXBYTES + 1], *d;
 253         d = (char *)uvchr_to_utf8((U8 *)ds, c);
 254         if (d - ds > 1) {
 255                 sv_utf8_upgrade(sv);
 256         }
 257         sv_catpvn(sv, ds, d - ds);
 258 }
 259
 260 static bool my_is_uni_xidfirst(pTHX_ UV c) {
 261         U8 tmpbuf[UTF8_MAXBYTES + 1];
 262         uvchr_to_utf8(tmpbuf, c);
 263         return is_utf8_xidfirst(tmpbuf);
 264 }
 265
 266 static bool my_is_uni_xidcont(pTHX_ UV c) {
 267         U8 tmpbuf[UTF8_MAXBYTES + 1];
 268         uvchr_to_utf8(tmpbuf, c);
 269         return is_utf8_xidcont(tmpbuf);
 270 }
 271
 272 static SV *my_scan_word(pTHX_ Sentinel sen, bool allow_package) {
 273         bool at_start, at_substart;
 274         I32 c;
 275         SV *sv = sentinel_mortalize(sen, newSVpvs(""));
 276         if (lex_bufutf8()) {
 277                 SvUTF8_on(sv);
 278         }
 279
 280         at_start = at_substart = TRUE;
 281         c = lex_peek_unichar(0);
 282
 283         while (c != -1) {
 284                 if (at_substart ? my_is_uni_xidfirst(aTHX_ c) : my_is_uni_xidcont(aTHX_ c)) {
 285                         lex_read_unichar(0);
 286                         my_sv_cat_c(aTHX_ sv, c);
 287                         at_substart = FALSE;
 288                         c = lex_peek_unichar(0);
 289                 } else if (allow_package && !at_substart && c == '\'') {
 290                         lex_read_unichar(0);
 291                         c = lex_peek_unichar(0);
 292                         if (!my_is_uni_xidfirst(aTHX_ c)) {
 293                                 lex_stuff_pvs("'", 0);
 294                                 break;
 295                         }
 296                         sv_catpvs(sv, "'");
 297                         at_substart = TRUE;
 298                 } else if (allow_package && (at_start || !at_substart) && c == ':') {
 299                         lex_read_unichar(0);
 300                         if (lex_peek_unichar(0) != ':') {
 301                                 lex_stuff_pvs(":", 0);
 302                                 break;
 303                         }
 304                         lex_read_unichar(0);
 305                         c = lex_peek_unichar(0);
 306                         if (!my_is_uni_xidfirst(aTHX_ c)) {
 307                                 lex_stuff_pvs("::", 0);
 308                                 break;
 309                         }
 310                         sv_catpvs(sv, "::");
 311                         at_substart = TRUE;
 312                 } else {
 313                         break;
 314                 }
 315                 at_start = FALSE;
 316         }
 317
 318         return SvCUR(sv) ? sv : NULL;
 319 }
 320
 321 static SV *my_scan_parens_tail(pTHX_ Sentinel sen, bool keep_backslash) {
 322         I32 c, nesting;
 323         SV *sv;
 324         line_t start;
 325
 326         start = CopLINE(PL_curcop);
 327
 328         sv = sentinel_mortalize(sen, newSVpvs(""));
 329         if (lex_bufutf8()) {
 330                 SvUTF8_on(sv);
 331         }
 332
 333         nesting = 0;
 334         for (;;) {
 335                 c = lex_read_unichar(0);
 336                 if (c == EOF) {
 337                         CopLINE_set(PL_curcop, start);
 338                         return NULL;
 339                 }
 340
 341                 if (c == '\\') {
 342                         c = lex_read_unichar(0);
 343                         if (c == EOF) {
 344                                 CopLINE_set(PL_curcop, start);
 345                                 return NULL;
 346                         }
 347                         if (keep_backslash || (c != '(' && c != ')')) {
 348                                 sv_catpvs(sv, "\\");
 349                         }
 350                 } else if (c == '(') {
 351                         nesting++;
 352                 } else if (c == ')') {
 353                         if (!nesting) {
 354                                 break;
 355                         }
 356                         nesting--;
 357                 }
 358
 359                 my_sv_cat_c(aTHX_ sv, c);
 360         }
 361
 362         return sv;
 363 }
 364
 365 static void my_check_prototype(pTHX_ Sentinel sen, const SV *declarator, SV *proto) {
 366         char *start, *r, *w, *end;
 367         STRLEN len;
 368
 369         /* strip spaces */
 370         start = SvPV(proto, len);
 371         end = start + len;
 372
 373         for (w = r = start; r < end; r++) {
 374                 if (!isSPACE(*r)) {
 375                         *w++ = *r;
 376                 }
 377         }
 378         *w = '\0';
 379         SvCUR_set(proto, w - start);
 380         end = w;
 381         len = end - start;
 382
 383         if (!ckWARN(WARN_ILLEGALPROTO)) {
 384                 return;
 385         }
 386
 387         /* check for bad characters */
 388         if (strspn(start, "$@%*;[]&\\_+") != len) {
 389                 SV *dsv = sentinel_mortalize(sen, newSVpvs(""));
 390                 warner(
 391                         packWARN(WARN_ILLEGALPROTO),
 392                         "Illegal character in prototype for %"SVf" : %s",
 393                         SVfARG(declarator),
 394                         SvUTF8(proto)
 395                                 ? sv_uni_display(
 396                                         dsv,
 397                                         proto,
 398                                         len,
 399                                         UNI_DISPLAY_ISPRINT
 400                                 )
 401                                 : pv_pretty(dsv, start, len, 60, NULL, NULL,
 402                                         PERL_PV_ESCAPE_NONASCII
 403                                 )
 404                 );
 405                 return;
 406         }
 407
 408         for (r = start; r < end; r++) {
 409                 switch (*r) {
 410                         default:
 411                                 warner(
 412                                         packWARN(WARN_ILLEGALPROTO),
 413                                         "Illegal character in prototype for %"SVf" : %s",
 414                                         SVfARG(declarator), r
 415                                 );
 416                                 return;
 417
 418                         case '_':
 419                                 if (r[1] && !strchr(";@%", *r)) {
 420                                         warner(
 421                                                 packWARN(WARN_ILLEGALPROTO),
 422                                                 "Illegal character after '_' in prototype for %"SVf" : %s",
 423                                                 SVfARG(declarator), r
 424                                         );
 425                                         return;
 426                                 }
 427                                 break;
 428
 429                         case '@':
 430                         case '%':
 431                                 if (r[1]) {
 432                                         warner(
 433                                                 packWARN(WARN_ILLEGALPROTO),
 434                                                 "prototype after '%c' for %"SVf": %s",
 435                                                 *r, SVfARG(declarator), r + 1
 436                                         );
 437                                         return;
 438                                 }
 439                                 break;
 440
 441                         case '\\':
 442                                 r++;
 443                                 if (strchr("$@%&*", *r)) {
 444                                         break;
 445                                 }
 446                                 if (*r == '[') {
 447                                         r++;
 448                                         for (; r < end && *r != ']'; r++) {
 449                                                 if (!strchr("$@%&*", *r)) {
 450                                                         break;
 451                                                 }
 452                                         }
 453                                         if (*r == ']' && r[-1] != '[') {
 454                                                 break;
 455                                         }
 456                                 }
 457                                 warner(
 458                                         packWARN(WARN_ILLEGALPROTO),
 459                                         "Illegal character after '\\' in prototype for %"SVf" : %s",
 460                                         SVfARG(declarator), r
 461                                 );
 462                                 return;
 463
 464                         case '$':
 465                         case '*':
 466                         case '&':
 467                         case ';':
 468                         case '+':
 469                                 break;
 470                 }
 471         }
 472 }
 473
 474 static SV *parse_type(pTHX_ Sentinel, const SV *);
 475
 476 static SV *parse_type_paramd(pTHX_ Sentinel sen, const SV *declarator) {
 477         I32 c;
 478         SV *t;
 479
 480         t = my_scan_word(aTHX_ sen, TRUE);
 481         lex_read_space(0);
 482
 483         c = lex_peek_unichar(0);
 484         if (c == '[') {
 485                 SV *u;
 486
 487                 lex_read_unichar(0);
 488                 lex_read_space(0);
 489                 my_sv_cat_c(aTHX_ t, c);
 490
 491                 u = parse_type(aTHX_ sen, declarator);
 492                 sv_catsv(t, u);
 493
 494                 c = lex_peek_unichar(0);
 495                 if (c != ']') {
 496                         croak("In %"SVf": missing ']' after '%"SVf"'", SVfARG(declarator), SVfARG(t));
 497                 }
 498                 lex_read_unichar(0);
 499                 lex_read_space(0);
 500
 501                 my_sv_cat_c(aTHX_ t, c);
 502         }
 503
 504         return t;
 505 }
 506
 507 static SV *parse_type(pTHX_ Sentinel sen, const SV *declarator) {
 508         I32 c;
 509         SV *t;
 510
 511         t = parse_type_paramd(aTHX_ sen, declarator);
 512
 513         c = lex_peek_unichar(0);
 514         while (c == '|') {
 515                 SV *u;
 516
 517                 lex_read_unichar(0);
 518                 lex_read_space(0);
 519
 520                 my_sv_cat_c(aTHX_ t, c);
 521                 u = parse_type_paramd(aTHX_ sen, declarator);
 522                 sv_catsv(t, u);
 523
 524                 c = lex_peek_unichar(0);
 525         }
 526
 527         return t;
 528 }
 529
 530 static SV *reify_type(pTHX_ Sentinel sen, const SV *declarator, SV *name) {
 531         SV *t;
 532         int n;
 533         dSP;
 534
 535         ENTER;
 536         SAVETMPS;
 537
 538         PUSHMARK(SP);
 539         EXTEND(SP, 1);
 540         PUSHs(name);
 541         PUTBACK;
 542
 543         n = call_pv("Moose::Util::TypeConstraints::find_or_create_isa_type_constraint", G_SCALAR);
 544         SPAGAIN;
 545
 546         assert(n == 1);
 547         /* don't warn about n being unused if assert() is compiled out */
 548         n = n;
 549
 550         t = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 551
 552         PUTBACK;
 553         FREETMPS;
 554         LEAVE;
 555
 556         if (!SvTRUE(t)) {
 557                 croak("In %"SVf": undefined type '%"SVf"'", SVfARG(declarator), SVfARG(name));
 558         }
 559
 560         return t;
 561 }
 562
 563
 564 DEFSTRUCT(Param) {
 565         SV *name;
 566         PADOFFSET padoff;
 567         SV *type;
 568 };
 569
 570 DEFSTRUCT(ParamInit) {
 571         Param param;
 572         OP *init;
 573 };
 574
 575 #define VEC(B) B ## _Vec
 576
 577 #define DEFVECTOR(B) DEFSTRUCT(VEC(B)) { \
 578         B (*data); \
 579         size_t used, size; \
 580 }
 581
 582 DEFVECTOR(Param);
 583 DEFVECTOR(ParamInit);
 584
 585 #define DEFVECTOR_INIT(N, B) static void N(VEC(B) *p) { \
 586         p->used = 0; \
 587         p->size = 23; \
 588         Newx(p->data, p->size, B); \
 589 } static void N(VEC(B) *)
 590
 591 DEFSTRUCT(ParamSpec) {
 592         Param invocant;
 593         VEC(Param) positional_required;
 594         VEC(ParamInit) positional_optional;
 595         VEC(Param) named_required;
 596         VEC(ParamInit) named_optional;
 597         Param slurpy;
 598         PADOFFSET rest_hash;
 599 };
 600
 601 DEFVECTOR_INIT(pv_init, Param);
 602 DEFVECTOR_INIT(piv_init, ParamInit);
 603
 604 static void p_init(Param *p) {
 605         p->name = NULL;
 606         p->padoff = NOT_IN_PAD;
 607         p->type = NULL;
 608 }
 609
 610 static void ps_init(ParamSpec *ps) {
 611         p_init(&ps->invocant);
 612         pv_init(&ps->positional_required);
 613         piv_init(&ps->positional_optional);
 614         pv_init(&ps->named_required);
 615         piv_init(&ps->named_optional);
 616         p_init(&ps->slurpy);
 617         ps->rest_hash = NOT_IN_PAD;
 618 }
 619
 620 #define DEFVECTOR_EXTEND(N, B) static B (*N(VEC(B) *p)) { \
 621         assert(p->used <= p->size); \
 622         if (p->used == p->size) { \
 623                 const size_t n = p->size / 2 * 3 + 1; \
 624                 Renew(p->data, n, B); \
 625                 p->size = n; \
 626         } \
 627         return &p->data[p->used]; \
 628 } static B (*N(VEC(B) *))
 629
 630 DEFVECTOR_EXTEND(pv_extend, Param);
 631 DEFVECTOR_EXTEND(piv_extend, ParamInit);
 632
 633 #define DEFVECTOR_CLEAR(N, B, F) static void N(pTHX_ VEC(B) *p) { \
 634         while (p->used) { \
 635                 p->used--; \
 636                 F(aTHX_ &p->data[p->used]); \
 637         } \
 638         Safefree(p->data); \
 639         p->data = NULL; \
 640         p->size = 0; \
 641 } static void N(pTHX_ VEC(B) *)
 642
 643 static void p_clear(pTHX_ Param *p) {
 644         p->name = NULL;
 645         p->padoff = NOT_IN_PAD;
 646         p->type = NULL;
 647 }
 648
 649 static void pi_clear(pTHX_ ParamInit *pi) {
 650         p_clear(aTHX_ &pi->param);
 651         if (pi->init) {
 652                 op_free(pi->init);
 653                 pi->init = NULL;
 654         }
 655 }
 656
 657 DEFVECTOR_CLEAR(pv_clear, Param, p_clear);
 658 DEFVECTOR_CLEAR(piv_clear, ParamInit, pi_clear);
 659
 660 static void ps_clear(pTHX_ ParamSpec *ps) {
 661         p_clear(aTHX_ &ps->invocant);
 662
 663         pv_clear(aTHX_ &ps->positional_required);
 664         piv_clear(aTHX_ &ps->positional_optional);
 665
 666         pv_clear(aTHX_ &ps->named_required);
 667         piv_clear(aTHX_ &ps->named_optional);
 668
 669         p_clear(aTHX_ &ps->slurpy);
 670 }
 671
 672 static int ps_contains(pTHX_ const ParamSpec *ps, SV *sv) {
 673         size_t i, lim;
 674
 675         if (ps->invocant.name && sv_eq(sv, ps->invocant.name)) {
 676                 return 1;
 677         }
 678
 679         for (i = 0, lim = ps->positional_required.used; i < lim; i++) {
 680                 if (sv_eq(sv, ps->positional_required.data[i].name)) {
 681                         return 1;
 682                 }
 683         }
 684
 685         for (i = 0, lim = ps->positional_optional.used; i < lim; i++) {
 686                 if (sv_eq(sv, ps->positional_optional.data[i].param.name)) {
 687                         return 1;
 688                 }
 689         }
 690
 691         for (i = 0, lim = ps->named_required.used; i < lim; i++) {
 692                 if (sv_eq(sv, ps->named_required.data[i].name)) {
 693                         return 1;
 694                 }
 695         }
 696
 697         for (i = 0, lim = ps->named_optional.used; i < lim; i++) {
 698                 if (sv_eq(sv, ps->named_optional.data[i].param.name)) {
 699                         return 1;
 700                 }
 701         }
 702
 703         return 0;
 704 }
 705
 706 static void ps_free_void(pTHX_ void *p) {
 707         ps_clear(aTHX_ p);
 708         Safefree(p);
 709 }
 710
 711 static int args_min(pTHX_ const ParamSpec *ps, const KWSpec *ks) {
 712         int n = 0;
 713         if (!ps) {
 714                 return SvTRUE(ks->shift) ? 1 : 0;
 715         }
 716         if (ps->invocant.name) {
 717                 n++;
 718         }
 719         n += ps->positional_required.used;
 720         n += ps->named_required.used * 2;
 721         return n;
 722 }
 723
 724 static int args_max(const ParamSpec *ps) {
 725         int n = 0;
 726         if (!ps) {
 727                 return -1;
 728         }
 729         if (ps->invocant.name) {
 730                 n++;
 731         }
 732         n += ps->positional_required.used;
 733         n += ps->positional_optional.used;
 734         if (ps->named_required.used || ps->named_optional.used || ps->slurpy.name) {
 735                 n = -1;
 736         }
 737         return n;
 738 }
 739
 740 static size_t count_positional_params(const ParamSpec *ps) {
 741         return ps->positional_required.used + ps->positional_optional.used;
 742 }
 743
 744 static size_t count_named_params(const ParamSpec *ps) {
 745         return ps->named_required.used + ps->named_optional.used;
 746 }
 747
 748 static void my_require(pTHX_ const char *file) {
 749         require_pv(file);
 750         if (SvTRUE(ERRSV)) {
 751                 croak_sv(ERRSV);
 752         }
 753 }
 754
 755 static SV *my_eval(pTHX_ Sentinel sen, I32 floor, OP *op) {
 756         SV *sv;
 757         CV *cv;
 758         dSP;
 759
 760         cv = newATTRSUB(floor, NULL, NULL, NULL, op);
 761
 762         ENTER;
 763         SAVETMPS;
 764
 765         PUSHMARK(SP);
 766         call_sv((SV *)cv, G_SCALAR | G_NOARGS);
 767         SPAGAIN;
 768         sv = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 769
 770         PUTBACK;
 771         FREETMPS;
 772         LEAVE;
 773
 774         return sv;
 775 }
 776
 777 enum {
 778         PARAM_INVOCANT = 0x01,
 779         PARAM_NAMED    = 0x02
 780 };
 781
 782 /* *pinit must be NULL on entry.
 783  * caller must free *pinit on error.
 784  */
 785 static PADOFFSET parse_param(
 786         pTHX_
 787         Sentinel sen,
 788         const SV *declarator, const KWSpec *spec, ParamSpec *param_spec,
 789         int *pflags, SV **pname, OP **pinit, SV **ptype
 790 ) {
 791         I32 c;
 792         char sigil;
 793         SV *name;
 794
 795         assert(!*pinit);
 796         *pflags = 0;
 797         *ptype = NULL;
 798
 799         c = lex_peek_unichar(0);
 800
 801         if (spec->flags & FLAG_TYPES_OK) {
 802                 if (c == '(') {
 803                         I32 floor;
 804                         OP *expr;
 805                         Resource *expr_sentinel;
 806
 807                         lex_read_unichar(0);
 808
 809                         floor = start_subparse(FALSE, 0);
 810                         SAVEFREESV(PL_compcv);
 811                         CvSPECIAL_on(PL_compcv);
 812
 813                         if (!(expr = parse_fullexpr(PARSE_OPTIONAL))) {
 814                                 croak("In %"SVf": invalid type expression", SVfARG(declarator));
 815                         }
 816                         expr_sentinel = sentinel_register(sen, expr, free_op_void);
 817
 818                         lex_read_space(0);
 819                         c = lex_peek_unichar(0);
 820                         if (c != ')') {
 821                                 croak("In %"SVf": missing ')' after type expression", SVfARG(declarator));
 822                         }
 823                         lex_read_unichar(0);
 824                         lex_read_space(0);
 825
 826                         SvREFCNT_inc_simple_void(PL_compcv);
 827                         sentinel_disarm(expr_sentinel);
 828                         *ptype = my_eval(aTHX_ sen, floor, expr);
 829                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 830                         if (!sv_isobject(*ptype)) {
 831                                 croak("In %"SVf": (%"SVf") doesn't look like a type object", SVfARG(declarator), SVfARG(*ptype));
 832                         }
 833
 834                         c = lex_peek_unichar(0);
 835                 } else if (my_is_uni_xidfirst(aTHX_ c)) {
 836                         *ptype = parse_type(aTHX_ sen, declarator);
 837                         my_require(aTHX_ "Moose/Util/TypeConstraints.pm");
 838                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 839
 840                         c = lex_peek_unichar(0);
 841                 }
 842         }
 843
 844         if (c == ':') {
 845                 lex_read_unichar(0);
 846                 lex_read_space(0);
 847
 848                 *pflags |= PARAM_NAMED;
 849
 850                 c = lex_peek_unichar(0);
 851         }
 852
 853         if (c == -1) {
 854                 croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 855         }
 856
 857         if (!(c == '$' || c == '@' || c == '%')) {
 858                 croak("In %"SVf": unexpected '%c' in parameter list (expecting a sigil)", SVfARG(declarator), (int)c);
 859         }
 860
 861         sigil = c;
 862
 863         lex_read_unichar(0);
 864         lex_read_space(0);
 865
 866         if (!(name = my_scan_word(aTHX_ sen, FALSE))) {
 867                 croak("In %"SVf": missing identifier after '%c'", SVfARG(declarator), sigil);
 868         }
 869         sv_insert(name, 0, 0, &sigil, 1);
 870         *pname = name;
 871
 872         lex_read_space(0);
 873         c = lex_peek_unichar(0);
 874
 875         if (c == '=') {
 876                 lex_read_unichar(0);
 877                 lex_read_space(0);
 878
 879
 880                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
 881                         param_spec->invocant.name = spec->shift;
 882                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
 883                 }
 884
 885                 *pinit = parse_termexpr(0);
 886
 887                 lex_read_space(0);
 888                 c = lex_peek_unichar(0);
 889         }
 890
 891         if (c == ':') {
 892                 *pflags |= PARAM_INVOCANT;
 893                 lex_read_unichar(0);
 894                 lex_read_space(0);
 895         } else if (c == ',') {
 896                 lex_read_unichar(0);
 897                 lex_read_space(0);
 898         } else if (c != ')') {
 899                 if (c == -1) {
 900                         croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 901                 }
 902                 croak("In %"SVf": unexpected '%c' in parameter list (expecting ',')", SVfARG(declarator), (int)c);
 903         }
 904
 905         return pad_add_name_sv(*pname, IF_HAVE_PERL_5_16(padadd_NO_DUP_CHECK, 0), NULL, NULL);
 906 }
 907
 908 static OP *my_var_g(pTHX_ I32 type, I32 flags, PADOFFSET padoff) {
 909         OP *var = newOP(type, flags);
 910         var->op_targ = padoff;
 911         return var;
 912 }
 913
 914 static OP *my_var(pTHX_ I32 flags, PADOFFSET padoff) {
 915         return my_var_g(aTHX_ OP_PADSV, flags, padoff);
 916 }
 917
 918 static OP *mkhvelem(pTHX_ PADOFFSET h, OP *k) {
 919         OP *hv = my_var_g(aTHX_ OP_PADHV, OPf_REF, h);
 920         return newBINOP(OP_HELEM, 0, hv, k);
 921 }
 922
 923 static OP *mkconstsv(pTHX_ SV *sv) {
 924         return newSVOP(OP_CONST, 0, sv);
 925 }
 926
 927 static OP *mkconstiv(pTHX_ IV i) {
 928         return mkconstsv(aTHX_ newSViv(i));
 929 }
 930
 931 static OP *mkconstpv(pTHX_ const char *p, size_t n) {
 932         return mkconstsv(aTHX_ newSVpv(p, n));
 933 }
 934
 935 #define mkconstpvs(S) mkconstpv(aTHX_ "" S "", sizeof S - 1)
 936
 937 static OP *mktypecheck(pTHX_ const SV *declarator, int nr, SV *name, PADOFFSET padoff, SV *type) {
 938         /* $type->check($value) or Carp::croak "...: " . $type->get_message($value) */
 939         OP *chk, *err, *msg, *xcroak;
 940
 941         err = mkconstsv(aTHX_ newSVpvf("In %"SVf": parameter %d (%"SVf"): ", SVfARG(declarator), nr, SVfARG(name)));
 942         {
 943                 OP *args = NULL;
 944
 945                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 946                 args = op_append_elem(
 947                         OP_LIST, args,
 948                         padoff == NOT_IN_PAD
 949                                 ? S_newDEFSVOP(aTHX)
 950                                 : my_var(aTHX_ 0, padoff)
 951                 );
 952                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("get_message")));
 953
 954                 msg = args;
 955                 msg->op_type = OP_ENTERSUB;
 956                 msg->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 957                 msg->op_flags |= OPf_STACKED;
 958         }
 959
 960         msg = newBINOP(OP_CONCAT, 0, err, msg);
 961
 962         xcroak = newCVREF(
 963                 OPf_WANT_SCALAR,
 964                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
 965         );
 966         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
 967
 968         {
 969                 OP *args = NULL;
 970
 971                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 972                 args = op_append_elem(
 973                         OP_LIST, args,
 974                         padoff == NOT_IN_PAD
 975                                 ? S_newDEFSVOP(aTHX)
 976                                 : my_var(aTHX_ 0, padoff)
 977                 );
 978                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("check")));
 979
 980                 chk = args;
 981                 chk->op_type = OP_ENTERSUB;
 982                 chk->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 983                 chk->op_flags |= OPf_STACKED;
 984         }
 985
 986         chk = newLOGOP(OP_OR, 0, chk, xcroak);
 987         return chk;
 988 }
 989
 990 static OP *mktypecheckp(pTHX_ const SV *declarator, int nr, const Param *param) {
 991         return mktypecheck(aTHX_ declarator, nr, param->name, param->padoff, param->type);
 992 }
 993
 994 static void register_info(pTHX_ UV key, SV *declarator, const KWSpec *kws, const ParamSpec *ps) {
 995         dSP;
 996
 997         ENTER;
 998         SAVETMPS;
 999
1000         PUSHMARK(SP);
1001         EXTEND(SP, 10);
1002
1003         /* 0 */ {
1004                 mPUSHu(key);
1005         }
1006         /* 1 */ {
1007                 size_t n;
1008                 char *p = SvPV(declarator, n);
1009                 char *q = memchr(p, ' ', n);
1010                 mPUSHp(p, q ? (size_t)(q - p) : n);
1011         }
1012         if (!ps) {
1013                 if (SvTRUE(kws->shift)) {
1014                         PUSHs(kws->shift);
1015                 } else {
1016                         PUSHmortal;
1017                 }
1018                 PUSHmortal;
1019                 mPUSHs(newRV_noinc((SV *)newAV()));
1020                 mPUSHs(newRV_noinc((SV *)newAV()));
1021                 mPUSHs(newRV_noinc((SV *)newAV()));
1022                 mPUSHs(newRV_noinc((SV *)newAV()));
1023                 mPUSHp("@_", 2);
1024                 PUSHmortal;
1025         } else {
1026                 /* 2, 3 */ {
1027                         if (ps->invocant.name) {
1028                                 PUSHs(ps->invocant.name);
1029                                 if (ps->invocant.type) {
1030                                         PUSHs(ps->invocant.type);
1031                                 } else {
1032                                         PUSHmortal;
1033                                 }
1034                         } else {
1035                                 PUSHmortal;
1036                                 PUSHmortal;
1037                         }
1038                 }
1039                 /* 4 */ {
1040                         size_t i, lim;
1041                         AV *av;
1042
1043                         lim = ps->positional_required.used;
1044
1045                         av = newAV();
1046                         if (lim) {
1047                                 av_extend(av, (lim - 1) * 2);
1048                                 for (i = 0; i < lim; i++) {
1049                                         Param *cur = &ps->positional_required.data[i];
1050                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1051                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1052                                 }
1053                         }
1054
1055                         mPUSHs(newRV_noinc((SV *)av));
1056                 }
1057                 /* 5 */ {
1058                         size_t i, lim;
1059                         AV *av;
1060
1061                         lim = ps->positional_optional.used;
1062
1063                         av = newAV();
1064                         if (lim) {
1065                                 av_extend(av, (lim - 1) * 2);
1066                                 for (i = 0; i < lim; i++) {
1067                                         Param *cur = &ps->positional_optional.data[i].param;
1068                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1069                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1070                                 }
1071                         }
1072
1073                         mPUSHs(newRV_noinc((SV *)av));
1074                 }
1075                 /* 6 */ {
1076                         size_t i, lim;
1077                         AV *av;
1078
1079                         lim = ps->named_required.used;
1080
1081                         av = newAV();
1082                         if (lim) {
1083                                 av_extend(av, (lim - 1) * 2);
1084                                 for (i = 0; i < lim; i++) {
1085                                         Param *cur = &ps->named_required.data[i];
1086                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1087                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1088                                 }
1089                         }
1090
1091                         mPUSHs(newRV_noinc((SV *)av));
1092                 }
1093                 /* 7 */ {
1094                         size_t i, lim;
1095                         AV *av;
1096
1097                         lim = ps->named_optional.used;
1098
1099                         av = newAV();
1100                         if (lim) {
1101                                 av_extend(av, (lim - 1) * 2);
1102                                 for (i = 0; i < lim; i++) {
1103                                         Param *cur = &ps->named_optional.data[i].param;
1104                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1105                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1106                                 }
1107                         }
1108
1109                         mPUSHs(newRV_noinc((SV *)av));
1110                 }
1111                 /* 8, 9 */ {
1112                         if (ps->slurpy.name) {
1113                                 PUSHs(ps->slurpy.name);
1114                                 if (ps->slurpy.type) {
1115                                         PUSHs(ps->slurpy.type);
1116                                 } else {
1117                                         PUSHmortal;
1118                                 }
1119                         } else {
1120                                 PUSHmortal;
1121                                 PUSHmortal;
1122                         }
1123                 }
1124         }
1125         PUTBACK;
1126
1127         call_pv(MY_PKG "::_register_info", G_VOID);
1128
1129         FREETMPS;
1130         LEAVE;
1131 }
1132
1133 static int parse_fun(pTHX_ Sentinel sen, OP **pop, const char *keyword_ptr, STRLEN keyword_len, const KWSpec *spec) {
1134         ParamSpec *param_spec;
1135         SV *declarator;
1136         I32 floor_ix;
1137         int save_ix;
1138         SV *saw_name;
1139         OP **prelude_sentinel;
1140         SV *proto;
1141         OP **attrs_sentinel, *body;
1142         unsigned builtin_attrs;
1143         I32 c;
1144
1145         declarator = sentinel_mortalize(sen, newSVpvn(keyword_ptr, keyword_len));
1146
1147         lex_read_space(0);
1148
1149         builtin_attrs = 0;
1150
1151         /* function name */
1152         saw_name = NULL;
1153         if ((spec->flags & FLAG_NAME_OK) && (saw_name = my_scan_word(aTHX_ sen, TRUE))) {
1154
1155                 if (PL_parser->expect != XSTATE) {
1156                         /* bail out early so we don't predeclare $saw_name */
1157                         croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
1158                 }
1159
1160                 sv_catpvs(declarator, " ");
1161                 sv_catsv(declarator, saw_name);
1162
1163                 if (
1164                         sv_eq_pvs(saw_name, "BEGIN") ||
1165                         sv_eq_pvs(saw_name, "END") ||
1166                         sv_eq_pvs(saw_name, "INIT") ||
1167                         sv_eq_pvs(saw_name, "CHECK") ||
1168                         sv_eq_pvs(saw_name, "UNITCHECK")
1169                 ) {
1170                         builtin_attrs |= MY_ATTR_SPECIAL;
1171                 }
1172
1173                 lex_read_space(0);
1174         } else if (!(spec->flags & FLAG_ANON_OK)) {
1175                 croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - PL_parser->bufptr), PL_parser->bufptr);
1176         } else {
1177                 sv_catpvs(declarator, " (anon)");
1178         }
1179
1180         /* we're a subroutine declaration */
1181         floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
1182         SAVEFREESV(PL_compcv);
1183
1184         /* create outer block: '{' */
1185         save_ix = S_block_start(aTHX_ TRUE);
1186
1187         /* initialize synthetic optree */
1188         Newx(prelude_sentinel, 1, OP *);
1189         *prelude_sentinel = NULL;
1190         sentinel_register(sen, prelude_sentinel, free_ptr_op_void);
1191
1192         /* parameters */
1193         param_spec = NULL;
1194
1195         c = lex_peek_unichar(0);
1196         if (c == '(') {
1197                 OP **init_sentinel;
1198
1199                 Newx(init_sentinel, 1, OP *);
1200                 *init_sentinel = NULL;
1201                 sentinel_register(sen, init_sentinel, free_ptr_op_void);
1202
1203                 Newx(param_spec, 1, ParamSpec);
1204                 ps_init(param_spec);
1205                 sentinel_register(sen, param_spec, ps_free_void);
1206
1207                 lex_read_unichar(0);
1208                 lex_read_space(0);
1209
1210                 while ((c = lex_peek_unichar(0)) != ')') {
1211                         int flags;
1212                         SV *name, *type;
1213                         char sigil;
1214                         PADOFFSET padoff;
1215
1216                         padoff = parse_param(aTHX_ sen, declarator, spec, param_spec, &flags, &name, init_sentinel, &type);
1217
1218                         S_intro_my(aTHX);
1219
1220                         sigil = SvPV_nolen(name)[0];
1221
1222                         /* internal consistency */
1223                         if (flags & PARAM_NAMED) {
1224                                 if (flags & PARAM_INVOCANT) {
1225                                         croak("In %"SVf": invocant %"SVf" can't be a named parameter", SVfARG(declarator), SVfARG(name));
1226                                 }
1227                                 if (sigil != '$') {
1228                                         croak("In %"SVf": named parameter %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1229                                 }
1230                         } else if (flags & PARAM_INVOCANT) {
1231                                 if (*init_sentinel) {
1232                                         croak("In %"SVf": invocant %"SVf" can't have a default value", SVfARG(declarator), SVfARG(name));
1233                                 }
1234                                 if (sigil != '$') {
1235                                         croak("In %"SVf": invocant %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1236                                 }
1237                         } else if (sigil != '$' && *init_sentinel) {
1238                                 croak("In %"SVf": %s %"SVf" can't have a default value", SVfARG(declarator), sigil == '@' ? "array" : "hash", SVfARG(name));
1239                         }
1240
1241                         /* external constraints */
1242                         if (param_spec->slurpy.name) {
1243                                 croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(param_spec->slurpy.name), SVfARG(name));
1244                         }
1245                         if (sigil != '$') {
1246                                 assert(!*init_sentinel);
1247                                 param_spec->slurpy.name = name;
1248                                 param_spec->slurpy.padoff = padoff;
1249                                 param_spec->slurpy.type = type;
1250                                 continue;
1251                         }
1252
1253                         if (!(flags & PARAM_NAMED) && count_named_params(param_spec)) {
1254                                 croak("In %"SVf": positional parameter %"SVf" can't appear after named parameter %"SVf"", SVfARG(declarator), SVfARG(name), SVfARG((param_spec->named_required.used ? param_spec->named_required.data[0] : param_spec->named_optional.data[0].param).name));
1255                         }
1256
1257                         if (flags & PARAM_INVOCANT) {
1258                                 if (param_spec->invocant.name) {
1259                                         croak("In %"SVf": invalid double invocants %"SVf", %"SVf"", SVfARG(declarator), SVfARG(param_spec->invocant.name), SVfARG(name));
1260                                 }
1261                                 if (count_positional_params(param_spec) || count_named_params(param_spec)) {
1262                                         croak("In %"SVf": invocant %"SVf" must be first in parameter list", SVfARG(declarator), SVfARG(name));
1263                                 }
1264                                 if (!(spec->flags & FLAG_INVOCANT)) {
1265                                         croak("In %"SVf": invocant %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1266                                 }
1267                                 param_spec->invocant.name = name;
1268                                 param_spec->invocant.padoff = padoff;
1269                                 param_spec->invocant.type = type;
1270                                 continue;
1271                         }
1272
1273                         if (*init_sentinel && !(spec->flags & FLAG_DEFAULT_ARGS)) {
1274                                 croak("In %"SVf": default argument for %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1275                         }
1276
1277                         if (ps_contains(aTHX_ param_spec, name)) {
1278                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(name));
1279                         }
1280
1281                         if (flags & PARAM_NAMED) {
1282                                 if (!(spec->flags & FLAG_NAMED_PARAMS)) {
1283                                         croak("In %"SVf": named parameter :%"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1284                                 }
1285
1286                                 if (*init_sentinel) {
1287                                         ParamInit *pi = piv_extend(&param_spec->named_optional);
1288                                         pi->param.name = name;
1289                                         pi->param.padoff = padoff;
1290                                         pi->param.type = type;
1291                                         pi->init = *init_sentinel;
1292                                         *init_sentinel = NULL;
1293                                         param_spec->named_optional.used++;
1294                                 } else {
1295                                         Param *p;
1296
1297                                         if (param_spec->positional_optional.used) {
1298                                                 croak("In %"SVf": can't combine optional positional (%"SVf") and required named (%"SVf") parameters", SVfARG(declarator), SVfARG(param_spec->positional_optional.data[0].param.name), SVfARG(name));
1299                                         }
1300
1301                                         p = pv_extend(&param_spec->named_required);
1302                                         p->name = name;
1303                                         p->padoff = padoff;
1304                                         p->type = type;
1305                                         param_spec->named_required.used++;
1306                                 }
1307                         } else {
1308                                 if (*init_sentinel || param_spec->positional_optional.used) {
1309                                         ParamInit *pi = piv_extend(&param_spec->positional_optional);
1310                                         pi->param.name = name;
1311                                         pi->param.padoff = padoff;
1312                                         pi->param.type = type;
1313                                         pi->init = *init_sentinel;
1314                                         *init_sentinel = NULL;
1315                                         param_spec->positional_optional.used++;
1316                                 } else {
1317                                         Param *p = pv_extend(&param_spec->positional_required);
1318                                         p->name = name;
1319                                         p->padoff = padoff;
1320                                         p->type = type;
1321                                         param_spec->positional_required.used++;
1322                                 }
1323                         }
1324
1325                 }
1326                 lex_read_unichar(0);
1327                 lex_read_space(0);
1328                 *init_sentinel = NULL;
1329
1330                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
1331                         if (ps_contains(aTHX_ param_spec, spec->shift)) {
1332                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(spec->shift));
1333                         }
1334
1335                         param_spec->invocant.name = spec->shift;
1336                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
1337                 }
1338         }
1339
1340         /* prototype */
1341         proto = NULL;
1342         c = lex_peek_unichar(0);
1343         if (c == ':') {
1344                 lex_read_unichar(0);
1345                 lex_read_space(0);
1346
1347                 c = lex_peek_unichar(0);
1348                 if (c != '(') {
1349                         lex_stuff_pvs(":", 0);
1350                         c = ':';
1351                 } else {
1352                         lex_read_unichar(0);
1353                         if (!(proto = my_scan_parens_tail(aTHX_ sen, FALSE))) {
1354                                 croak("In %"SVf": prototype not terminated", SVfARG(declarator));
1355                         }
1356                         my_check_prototype(aTHX_ sen, declarator, proto);
1357                         lex_read_space(0);
1358                         c = lex_peek_unichar(0);
1359                         if (!(c == ':' || c == '{')) {
1360                                 lex_stuff_pvs(":", 0);
1361                                 c = ':';
1362                         }
1363                 }
1364         }
1365
1366         /* attributes */
1367         Newx(attrs_sentinel, 1, OP *);
1368         *attrs_sentinel = NULL;
1369         sentinel_register(sen, attrs_sentinel, free_ptr_op_void);
1370
1371         if (c == ':' || c == '{') /* '}' - hi, vim */ {
1372
1373                 /* kludge default attributes in */
1374                 if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
1375                         lex_stuff_sv(spec->attrs, 0);
1376                         c = ':';
1377                 }
1378
1379                 if (c == ':') {
1380                         lex_read_unichar(0);
1381                         lex_read_space(0);
1382                         c = lex_peek_unichar(0);
1383
1384                         for (;;) {
1385                                 SV *attr;
1386
1387                                 if (!(attr = my_scan_word(aTHX_ sen, FALSE))) {
1388                                         break;
1389                                 }
1390
1391                                 lex_read_space(0);
1392                                 c = lex_peek_unichar(0);
1393
1394                                 if (c != '(') {
1395                                         if (sv_eq_pvs(attr, "lvalue")) {
1396                                                 builtin_attrs |= MY_ATTR_LVALUE;
1397                                                 attr = NULL;
1398                                         } else if (sv_eq_pvs(attr, "method")) {
1399                                                 builtin_attrs |= MY_ATTR_METHOD;
1400                                                 attr = NULL;
1401                                         }
1402                                 } else {
1403                                         SV *sv;
1404                                         lex_read_unichar(0);
1405                                         if (!(sv = my_scan_parens_tail(aTHX_ sen, TRUE))) {
1406                                                 croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
1407                                         }
1408                                         sv_catpvs(attr, "(");
1409                                         sv_catsv(attr, sv);
1410                                         sv_catpvs(attr, ")");
1411
1412                                         lex_read_space(0);
1413                                         c = lex_peek_unichar(0);
1414                                 }
1415
1416                                 if (attr) {
1417                                         *attrs_sentinel = op_append_elem(OP_LIST, *attrs_sentinel, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(attr)));
1418                                 }
1419
1420                                 if (c == ':') {
1421                                         lex_read_unichar(0);
1422                                         lex_read_space(0);
1423                                         c = lex_peek_unichar(0);
1424                                 }
1425                         }
1426                 }
1427         }
1428
1429         /* body */
1430         if (c != '{') /* '}' - hi, vim */ {
1431                 croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
1432         }
1433
1434         /* surprise predeclaration! */
1435         if (saw_name) {
1436                 /* 'sub NAME (PROTO);' to make name/proto known to perl before it
1437                    starts parsing the body */
1438                 const I32 sub_ix = start_subparse(FALSE, 0);
1439                 SAVEFREESV(PL_compcv);
1440
1441                 SvREFCNT_inc_simple_void(PL_compcv);
1442
1443                 newATTRSUB(
1444                         sub_ix,
1445                         mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(saw_name)),
1446                         proto ? mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(proto)) : NULL,
1447                         NULL,
1448                         NULL
1449                 );
1450         }
1451
1452         if (builtin_attrs & MY_ATTR_LVALUE) {
1453                 CvLVALUE_on(PL_compcv);
1454         }
1455         if (builtin_attrs & MY_ATTR_METHOD) {
1456                 CvMETHOD_on(PL_compcv);
1457         }
1458         if (builtin_attrs & MY_ATTR_SPECIAL) {
1459                 CvSPECIAL_on(PL_compcv);
1460         }
1461
1462         /* check number of arguments */
1463         if (spec->flags & FLAG_CHECK_NARGS) {
1464                 int amin, amax;
1465
1466                 amin = args_min(aTHX_ param_spec, spec);
1467                 if (amin > 0) {
1468                         OP *chk, *cond, *err, *xcroak;
1469
1470                         err = mkconstsv(aTHX_ newSVpvf("Not enough arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amin));
1471                         err = newBINOP(
1472                                 OP_CONCAT, 0,
1473                                 err,
1474                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1475                         );
1476                         err = newBINOP(
1477                                 OP_CONCAT, 0,
1478                                 err,
1479                                 mkconstpvs(")")
1480                         );
1481
1482                         xcroak = newCVREF(OPf_WANT_SCALAR,
1483                                           newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV)));
1484                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1485                                       op_append_elem(OP_LIST, err, xcroak));
1486
1487                         cond = newBINOP(OP_LT, 0,
1488                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1489                                         mkconstiv(aTHX_ amin));
1490                         chk = newLOGOP(OP_AND, 0, cond, err);
1491
1492                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1493                 }
1494
1495                 amax = args_max(param_spec);
1496                 if (amax >= 0) {
1497                         OP *chk, *cond, *err, *xcroak;
1498
1499                         err = mkconstsv(aTHX_ newSVpvf("Too many arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amax));
1500                         err = newBINOP(
1501                                 OP_CONCAT, 0,
1502                                 err,
1503                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1504                         );
1505                         err = newBINOP(
1506                                 OP_CONCAT, 0,
1507                                 err,
1508                                 mkconstpvs(")")
1509                         );
1510
1511                         xcroak = newCVREF(
1512                                 OPf_WANT_SCALAR,
1513                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1514                         );
1515                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1516                         op_append_elem(OP_LIST, err, xcroak));
1517
1518                         cond = newBINOP(
1519                                 OP_GT, 0,
1520                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1521                                 mkconstiv(aTHX_ amax)
1522                         );
1523                         chk = newLOGOP(OP_AND, 0, cond, err);
1524
1525                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1526                 }
1527
1528                 if (param_spec && (count_named_params(param_spec) || (param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%'))) {
1529                         OP *chk, *cond, *err, *xcroak;
1530                         const UV fixed = count_positional_params(param_spec) + !!param_spec->invocant.name;
1531
1532                         err = mkconstsv(aTHX_ newSVpvf("Odd number of paired arguments for %"SVf"", SVfARG(declarator)));
1533
1534                         xcroak = newCVREF(
1535                                 OPf_WANT_SCALAR,
1536                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1537                         );
1538                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1539                         op_append_elem(OP_LIST, err, xcroak));
1540
1541                         cond = newBINOP(OP_GT, 0,
1542                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1543                                         mkconstiv(aTHX_ fixed));
1544                         cond = newLOGOP(OP_AND, 0,
1545                                         cond,
1546                                         newBINOP(OP_MODULO, 0,
1547                                                  fixed
1548                                                  ? newBINOP(OP_SUBTRACT, 0,
1549                                                             newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1550                                                             mkconstiv(aTHX_ fixed))
1551                                                  : newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1552                                                  mkconstiv(aTHX_ 2)));
1553                         chk = newLOGOP(OP_AND, 0, cond, err);
1554
1555                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1556                 }
1557         }
1558
1559         if (!param_spec) {
1560                 /* my $invocant = shift; */
1561                 if (SvTRUE(spec->shift)) {
1562                         OP *var;
1563
1564                         var = my_var(
1565                                 aTHX_
1566                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1567                                 pad_add_name_sv(spec->shift, 0, NULL, NULL)
1568                         );
1569                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1570
1571                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1572                 }
1573         } else {
1574                 /* my $invocant = shift; */
1575                 if (param_spec->invocant.name) {
1576                         OP *var;
1577
1578                         var = my_var(
1579                                 aTHX_
1580                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1581                                 param_spec->invocant.padoff
1582                         );
1583                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1584
1585                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1586
1587                         if (param_spec->invocant.type && (spec->flags & FLAG_CHECK_TARGS)) {
1588                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, 0, &param_spec->invocant)));
1589                         }
1590                 }
1591
1592                 /* my (...) = @_; */
1593                 {
1594                         OP *lhs;
1595                         size_t i, lim;
1596
1597                         lhs = NULL;
1598
1599                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1600                                 OP *const var = my_var(
1601                                         aTHX_
1602                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1603                                         param_spec->positional_required.data[i].padoff
1604                                 );
1605                                 lhs = op_append_elem(OP_LIST, lhs, var);
1606                         }
1607
1608                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1609                                 OP *const var = my_var(
1610                                         aTHX_
1611                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1612                                         param_spec->positional_optional.data[i].param.padoff
1613                                 );
1614                                 lhs = op_append_elem(OP_LIST, lhs, var);
1615                         }
1616
1617                         {
1618                                 PADOFFSET padoff;
1619                                 I32 type;
1620                                 bool slurpy_hash;
1621
1622                                 /*
1623                                  * cases:
1624                                  *  1) no named params
1625                                  *   1.1) slurpy
1626                                  *       => put it in
1627                                  *   1.2) no slurpy
1628                                  *       => nop
1629                                  *  2) named params
1630                                  *   2.1) no slurpy
1631                                  *       => synthetic %{rest}
1632                                  *   2.2) slurpy is a hash
1633                                  *       => put it in
1634                                  *   2.3) slurpy is an array
1635                                  *       => synthetic %{rest}
1636                                  *          remember to declare array later
1637                                  */
1638
1639                                 slurpy_hash = param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%';
1640                                 if (!count_named_params(param_spec)) {
1641                                         if (param_spec->slurpy.name) {
1642                                                 padoff = param_spec->slurpy.padoff;
1643                                                 type = slurpy_hash ? OP_PADHV : OP_PADAV;
1644                                         } else {
1645                                                 padoff = NOT_IN_PAD;
1646                                                 type = OP_PADSV;
1647                                         }
1648                                 } else if (slurpy_hash) {
1649                                         padoff = param_spec->slurpy.padoff;
1650                                         type = OP_PADHV;
1651                                 } else {
1652                                         padoff = param_spec->rest_hash = pad_add_name_pvs("%{rest}", 0, NULL, NULL);
1653                                         type = OP_PADHV;
1654                                 }
1655
1656                                 if (padoff != NOT_IN_PAD) {
1657                                         OP *const var = my_var_g(
1658                                                 aTHX_
1659                                                 type,
1660                                                 OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1661                                                 padoff
1662                                         );
1663
1664                                         lhs = op_append_elem(OP_LIST, lhs, var);
1665
1666                                         if (type == OP_PADHV) {
1667                                                 param_spec->rest_hash = padoff;
1668                                         }
1669                                 }
1670                         }
1671
1672                         if (lhs) {
1673                                 OP *rhs;
1674                                 lhs->op_flags |= OPf_PARENS;
1675                                 rhs = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
1676
1677                                 *prelude_sentinel = op_append_list(
1678                                         OP_LINESEQ, *prelude_sentinel,
1679                                         newSTATEOP(
1680                                                 0, NULL,
1681                                                 newASSIGNOP(OPf_STACKED, lhs, 0, rhs)
1682                                         )
1683                                 );
1684                         }
1685                 }
1686
1687                 /* default positional arguments */
1688                 {
1689                         size_t i, lim, req;
1690                         OP *nest;
1691
1692                         nest = NULL;
1693
1694                         req = param_spec->positional_required.used;
1695                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1696                                 ParamInit *cur = &param_spec->positional_optional.data[i];
1697                                 OP *var, *cond;
1698
1699                                 cond = newBINOP(
1700                                         OP_LT, 0,
1701                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1702                                         mkconstiv(aTHX_ req + i + 1)
1703                                 );
1704
1705                                 var = my_var(aTHX_ 0, cur->param.padoff);
1706
1707                                 nest = op_append_list(
1708                                         OP_LINESEQ, nest,
1709                                         newASSIGNOP(OPf_STACKED, var, 0, cur->init)
1710                                 );
1711                                 cur->init = NULL;
1712                                 nest = newCONDOP(
1713                                         0,
1714                                         cond,
1715                                         nest,
1716                                         NULL
1717                                 );
1718                         }
1719
1720                         *prelude_sentinel = op_append_list(
1721                                 OP_LINESEQ, *prelude_sentinel,
1722                                 nest
1723                         );
1724                 }
1725
1726                 /* named parameters */
1727                 if (count_named_params(param_spec)) {
1728                         size_t i, lim;
1729
1730                         assert(param_spec->rest_hash != NOT_IN_PAD);
1731
1732                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1733                                 Param *cur = &param_spec->named_required.data[i];
1734                                 size_t n;
1735                                 char *p = SvPV(cur->name, n);
1736                                 OP *var, *cond;
1737
1738                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1739
1740                                 if (spec->flags & FLAG_CHECK_NARGS) {
1741                                         OP *xcroak, *msg;
1742
1743                                         var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1744                                         var = newUNOP(OP_DELETE, 0, var);
1745
1746                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": missing named parameter: %.*s", SVfARG(declarator), (int)(n - 1), p + 1));
1747                                         xcroak = newCVREF(
1748                                                 OPf_WANT_SCALAR,
1749                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1750                                         );
1751                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1752
1753                                         cond = newUNOP(OP_EXISTS, 0, cond);
1754
1755                                         cond = newCONDOP(0, cond, var, xcroak);
1756                                 }
1757
1758                                 var = my_var(
1759                                         aTHX_
1760                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1761                                         cur->padoff
1762                                 );
1763                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1764
1765                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1766                         }
1767
1768                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1769                                 ParamInit *cur = &param_spec->named_optional.data[i];
1770                                 size_t n;
1771                                 char *p = SvPV(cur->param.name, n);
1772                                 OP *var, *cond;
1773
1774                                 var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1775                                 var = newUNOP(OP_DELETE, 0, var);
1776
1777                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1778                                 cond = newUNOP(OP_EXISTS, 0, cond);
1779
1780                                 cond = newCONDOP(0, cond, var, cur->init);
1781                                 cur->init = NULL;
1782
1783                                 var = my_var(
1784                                         aTHX_
1785                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1786                                         cur->param.padoff
1787                                 );
1788                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1789
1790                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1791                         }
1792
1793                         if (!param_spec->slurpy.name) {
1794                                 if (spec->flags & FLAG_CHECK_NARGS) {
1795                                         /* croak if %{rest} */
1796                                         OP *xcroak, *cond, *keys, *msg;
1797
1798                                         keys = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1799                                         keys = newLISTOP(OP_SORT, 0, newOP(OP_PUSHMARK, 0), keys);
1800                                         {
1801                                                 OP *first, *mid, *last;
1802
1803                                                 last = keys;
1804
1805                                                 mid = mkconstpvs(", ");
1806                                                 mid->op_sibling = last;
1807
1808                                                 first = newOP(OP_PUSHMARK, 0);
1809
1810                                                 keys = newLISTOP(OP_JOIN, 0, first, mid);
1811                                                 keys->op_targ = pad_alloc(OP_JOIN, SVs_PADTMP);
1812                                                 ((LISTOP *)keys)->op_last = last;
1813                                         }
1814
1815                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": no such named parameter: ", SVfARG(declarator)));
1816                                         msg = newBINOP(OP_CONCAT, 0, msg, keys);
1817
1818                                         xcroak = newCVREF(
1819                                                 OPf_WANT_SCALAR,
1820                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1821                                         );
1822                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1823
1824                                         cond = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1825                                         xcroak = newCONDOP(0, cond, xcroak, NULL);
1826
1827                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, xcroak));
1828                                 } else {
1829                                         OP *clear;
1830
1831                                         clear = newASSIGNOP(
1832                                                 OPf_STACKED,
1833                                                 my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1834                                                 0,
1835                                                 newNULLLIST()
1836                                         );
1837
1838                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, clear));
1839                                 }
1840                         } else if (param_spec->slurpy.padoff != param_spec->rest_hash) {
1841                                 OP *var, *clear;
1842
1843                                 assert(SvPV_nolen(param_spec->slurpy.name)[0] == '@');
1844
1845                                 var = my_var_g(
1846                                         aTHX_
1847                                         OP_PADAV,
1848                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1849                                         param_spec->slurpy.padoff
1850                                 );
1851
1852                                 var = newASSIGNOP(OPf_STACKED, var, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1853
1854                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1855
1856                                 clear = newASSIGNOP(
1857                                         OPf_STACKED,
1858                                         my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1859                                         0,
1860                                         newNULLLIST()
1861                                 );
1862
1863                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, clear));
1864                         }
1865                 }
1866
1867                 if (spec->flags & FLAG_CHECK_TARGS) {
1868                         size_t i, lim, base;
1869
1870                         base = 1;
1871                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1872                                 Param *cur = &param_spec->positional_required.data[i];
1873
1874                                 if (cur->type) {
1875                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1876                                 }
1877                         }
1878                         base += i;
1879
1880                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1881                                 Param *cur = &param_spec->positional_optional.data[i].param;
1882
1883                                 if (cur->type) {
1884                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1885                                 }
1886                         }
1887                         base += i;
1888
1889                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1890                                 Param *cur = &param_spec->named_required.data[i];
1891
1892                                 if (cur->type) {
1893                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1894                                 }
1895                         }
1896                         base += i;
1897
1898                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1899                                 Param *cur = &param_spec->named_optional.data[i].param;
1900
1901                                 if (cur->type) {
1902                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1903                                 }
1904                         }
1905                         base += i;
1906
1907                         if (param_spec->slurpy.type) {
1908                                 /* $type->valid($_) or croak $type->get_message($_) for @rest / values %rest */
1909                                 OP *check, *list, *loop;
1910
1911                                 check = mktypecheck(aTHX_ declarator, base, param_spec->slurpy.name, NOT_IN_PAD, param_spec->slurpy.type);
1912
1913                                 if (SvPV_nolen(param_spec->slurpy.name)[0] == '@') {
1914                                         list = my_var_g(aTHX_ OP_PADAV, 0, param_spec->slurpy.padoff);
1915                                 } else {
1916                                         list = my_var_g(aTHX_ OP_PADHV, 0, param_spec->slurpy.padoff);
1917                                         list = newUNOP(OP_VALUES, 0, list);
1918                                 }
1919
1920                                 loop = newFOROP(0, NULL, list, check, NULL);
1921
1922                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, loop));
1923                         }
1924                 }
1925         }
1926
1927         /* finally let perl parse the actual subroutine body */
1928         body = parse_block(0);
1929
1930         /* add '();' to make function return nothing by default */
1931         /* (otherwise the invisible parameter initialization can "leak" into
1932            the return value: fun ($x) {}->("asdf", 0) == 2) */
1933         if (*prelude_sentinel) {
1934                 body = newSTATEOP(0, NULL, body);
1935         }
1936
1937         body = op_append_list(OP_LINESEQ, *prelude_sentinel, body);
1938         *prelude_sentinel = NULL;
1939
1940         /* it's go time. */
1941         {
1942                 CV *cv;
1943                 OP *const attrs = *attrs_sentinel;
1944                 *attrs_sentinel = NULL;
1945
1946                 SvREFCNT_inc_simple_void(PL_compcv);
1947
1948                 /* close outer block: '}' */
1949                 S_block_end(aTHX_ save_ix, body);
1950
1951                 cv = newATTRSUB(
1952                         floor_ix,
1953                         saw_name ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)) : NULL,
1954                         proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
1955                         attrs,
1956                         body
1957                 );
1958
1959                 register_info(aTHX_ PTR2UV(CvROOT(cv)), declarator, spec, param_spec);
1960
1961                 if (saw_name) {
1962                         *pop = newOP(OP_NULL, 0);
1963                         return KEYWORD_PLUGIN_STMT;
1964                 }
1965
1966                 *pop = newUNOP(
1967                         OP_REFGEN, 0,
1968                         newSVOP(
1969                                 OP_ANONCODE, 0,
1970                                 (SV *)cv
1971                         )
1972                 );
1973                 return KEYWORD_PLUGIN_EXPR;
1974         }
1975 }
1976
1977 static int my_keyword_plugin(pTHX_ char *keyword_ptr, STRLEN keyword_len, OP **op_ptr) {
1978         KWSpec spec;
1979         int ret;
1980         Sentinel sen = { NULL };
1981
1982         ENTER;
1983         SAVETMPS;
1984
1985         SAVEDESTRUCTOR_X(sentinel_clear_void, sen);
1986
1987         if (kw_flags(aTHX_ sen, keyword_ptr, keyword_len, &spec)) {
1988                 ret = parse_fun(aTHX_ sen, op_ptr, keyword_ptr, keyword_len, &spec);
1989         } else {
1990                 ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
1991         }
1992
1993         FREETMPS;
1994         LEAVE;
1995
1996         return ret;
1997 }
1998
1999 WARNINGS_RESET
2000
2001 MODULE = Function::Parameters   PACKAGE = Function::Parameters   PREFIX = fp_
2002 PROTOTYPES: ENABLE
2003
2004 UV
2005 fp__cv_root(sv)
2006         SV * sv
2007         PREINIT:
2008                 CV *xcv;
2009                 HV *hv;
2010                 GV *gv;
2011         CODE:
2012                 xcv = sv_2cv(sv, &hv, &gv, 0);
2013                 RETVAL = PTR2UV(xcv ? CvROOT(xcv) : NULL);
2014         OUTPUT:
2015                 RETVAL
2016
2017 BOOT:
2018 WARNINGS_ENABLE {
2019         HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
2020         /**/
2021         newCONSTSUB(stash, "FLAG_NAME_OK",      newSViv(FLAG_NAME_OK));
2022         newCONSTSUB(stash, "FLAG_ANON_OK",      newSViv(FLAG_ANON_OK));
2023         newCONSTSUB(stash, "FLAG_DEFAULT_ARGS", newSViv(FLAG_DEFAULT_ARGS));
2024         newCONSTSUB(stash, "FLAG_CHECK_NARGS",  newSViv(FLAG_CHECK_NARGS));
2025         newCONSTSUB(stash, "FLAG_INVOCANT",     newSViv(FLAG_INVOCANT));
2026         newCONSTSUB(stash, "FLAG_NAMED_PARAMS", newSViv(FLAG_NAMED_PARAMS));
2027         newCONSTSUB(stash, "FLAG_TYPES_OK",     newSViv(FLAG_TYPES_OK));
2028         newCONSTSUB(stash, "FLAG_CHECK_TARGS",  newSViv(FLAG_CHECK_TARGS));
2029         newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
2030         newCONSTSUB(stash, "HINTK_FLAGS_",   newSVpvs(HINTK_FLAGS_));
2031         newCONSTSUB(stash, "HINTK_SHIFT_",   newSVpvs(HINTK_SHIFT_));
2032         newCONSTSUB(stash, "HINTK_ATTRS_",   newSVpvs(HINTK_ATTRS_));
2033         /**/
2034         next_keyword_plugin = PL_keyword_plugin;
2035         PL_keyword_plugin = my_keyword_plugin;
2036 } WARNINGS_RESET