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
 161 #if HAVE_PERL_VERSION(5, 17, 2)
 162  #define MY_OP_SLABBED(O) ((O)->op_slabbed)
 163 #else
 164  #define MY_OP_SLABBED(O) 0
 165 #endif
 166
 167 DEFSTRUCT(OpGuard) {
 168         OP *op;
 169         bool needs_freed;
 170 };
 171
 172 static void op_guard_init(OpGuard *p) {
 173         p->op = NULL;
 174         p->needs_freed = FALSE;
 175 }
 176
 177 static OpGuard op_guard_transfer(OpGuard *p) {
 178         OpGuard r = *p;
 179         op_guard_init(p);
 180         return r;
 181 }
 182
 183 static OP *op_guard_relinquish(OpGuard *p) {
 184         OP *o = p->op;
 185         op_guard_init(p);
 186         return o;
 187 }
 188
 189 static void op_guard_update(OpGuard *p, OP *o) {
 190         p->op = o;
 191         p->needs_freed = o && !MY_OP_SLABBED(o);
 192 }
 193
 194 static void op_guard_clear(pTHX_ OpGuard *p) {
 195         if (p->needs_freed) {
 196                 op_free(p->op);
 197         }
 198 }
 199
 200 static void free_op_guard_void(pTHX_ void *vp) {
 201         OpGuard *p = vp;
 202         op_guard_clear(aTHX_ p);
 203         Safefree(p);
 204 }
 205
 206 static void free_op_void(pTHX_ void *vp) {
 207         OP *p = vp;
 208         op_free(p);
 209 }
 210
 211 #define sv_eq_pvs(SV, S) my_sv_eq_pvn(aTHX_ SV, "" S "", sizeof (S) - 1)
 212
 213 static int my_sv_eq_pvn(pTHX_ SV *sv, const char *p, STRLEN n) {
 214         STRLEN sv_len;
 215         const char *sv_p = SvPV(sv, sv_len);
 216         return memcmp(sv_p, p, n) == 0;
 217 }
 218
 219
 220 #include "padop_on_crack.c.inc"
 221
 222
 223 enum {
 224         MY_ATTR_LVALUE = 0x01,
 225         MY_ATTR_METHOD = 0x02,
 226         MY_ATTR_SPECIAL = 0x04
 227 };
 228
 229 static void my_sv_cat_c(pTHX_ SV *sv, U32 c) {
 230         char ds[UTF8_MAXBYTES + 1], *d;
 231         d = (char *)uvchr_to_utf8((U8 *)ds, c);
 232         if (d - ds > 1) {
 233                 sv_utf8_upgrade(sv);
 234         }
 235         sv_catpvn(sv, ds, d - ds);
 236 }
 237
 238
 239 #define MY_UNI_IDFIRST(C) isIDFIRST_uni(C)
 240 #define MY_UNI_IDCONT(C)  isALNUM_uni(C)
 241
 242 static SV *my_scan_word(pTHX_ Sentinel sen, bool allow_package) {
 243         bool at_start, at_substart;
 244         I32 c;
 245         SV *sv = sentinel_mortalize(sen, newSVpvs(""));
 246         if (lex_bufutf8()) {
 247                 SvUTF8_on(sv);
 248         }
 249
 250         at_start = at_substart = TRUE;
 251         c = lex_peek_unichar(0);
 252
 253         while (c != -1) {
 254                 if (at_substart ? MY_UNI_IDFIRST(c) : MY_UNI_IDCONT(c)) {
 255                         lex_read_unichar(0);
 256                         my_sv_cat_c(aTHX_ sv, c);
 257                         at_substart = FALSE;
 258                         c = lex_peek_unichar(0);
 259                 } else if (allow_package && !at_substart && c == '\'') {
 260                         lex_read_unichar(0);
 261                         c = lex_peek_unichar(0);
 262                         if (!MY_UNI_IDFIRST(c)) {
 263                                 lex_stuff_pvs("'", 0);
 264                                 break;
 265                         }
 266                         sv_catpvs(sv, "'");
 267                         at_substart = TRUE;
 268                 } else if (allow_package && (at_start || !at_substart) && c == ':') {
 269                         lex_read_unichar(0);
 270                         if (lex_peek_unichar(0) != ':') {
 271                                 lex_stuff_pvs(":", 0);
 272                                 break;
 273                         }
 274                         lex_read_unichar(0);
 275                         c = lex_peek_unichar(0);
 276                         if (!MY_UNI_IDFIRST(c)) {
 277                                 lex_stuff_pvs("::", 0);
 278                                 break;
 279                         }
 280                         sv_catpvs(sv, "::");
 281                         at_substart = TRUE;
 282                 } else {
 283                         break;
 284                 }
 285                 at_start = FALSE;
 286         }
 287
 288         return SvCUR(sv) ? sv : NULL;
 289 }
 290
 291 static SV *my_scan_parens_tail(pTHX_ Sentinel sen, bool keep_backslash) {
 292         I32 c, nesting;
 293         SV *sv;
 294         line_t start;
 295
 296         start = CopLINE(PL_curcop);
 297
 298         sv = sentinel_mortalize(sen, newSVpvs(""));
 299         if (lex_bufutf8()) {
 300                 SvUTF8_on(sv);
 301         }
 302
 303         nesting = 0;
 304         for (;;) {
 305                 c = lex_read_unichar(0);
 306                 if (c == EOF) {
 307                         CopLINE_set(PL_curcop, start);
 308                         return NULL;
 309                 }
 310
 311                 if (c == '\\') {
 312                         c = lex_read_unichar(0);
 313                         if (c == EOF) {
 314                                 CopLINE_set(PL_curcop, start);
 315                                 return NULL;
 316                         }
 317                         if (keep_backslash || (c != '(' && c != ')')) {
 318                                 sv_catpvs(sv, "\\");
 319                         }
 320                 } else if (c == '(') {
 321                         nesting++;
 322                 } else if (c == ')') {
 323                         if (!nesting) {
 324                                 break;
 325                         }
 326                         nesting--;
 327                 }
 328
 329                 my_sv_cat_c(aTHX_ sv, c);
 330         }
 331
 332         return sv;
 333 }
 334
 335 static void my_check_prototype(pTHX_ Sentinel sen, const SV *declarator, SV *proto) {
 336         char *start, *r, *w, *end;
 337         STRLEN len;
 338
 339         /* strip spaces */
 340         start = SvPV(proto, len);
 341         end = start + len;
 342
 343         for (w = r = start; r < end; r++) {
 344                 if (!isSPACE(*r)) {
 345                         *w++ = *r;
 346                 }
 347         }
 348         *w = '\0';
 349         SvCUR_set(proto, w - start);
 350         end = w;
 351         len = end - start;
 352
 353         if (!ckWARN(WARN_ILLEGALPROTO)) {
 354                 return;
 355         }
 356
 357         /* check for bad characters */
 358         if (strspn(start, "$@%*;[]&\\_+") != len) {
 359                 SV *dsv = sentinel_mortalize(sen, newSVpvs(""));
 360                 warner(
 361                         packWARN(WARN_ILLEGALPROTO),
 362                         "Illegal character in prototype for %"SVf" : %s",
 363                         SVfARG(declarator),
 364                         SvUTF8(proto)
 365                                 ? sv_uni_display(
 366                                         dsv,
 367                                         proto,
 368                                         len,
 369                                         UNI_DISPLAY_ISPRINT
 370                                 )
 371                                 : pv_pretty(dsv, start, len, 60, NULL, NULL,
 372                                         PERL_PV_ESCAPE_NONASCII
 373                                 )
 374                 );
 375                 return;
 376         }
 377
 378         for (r = start; r < end; r++) {
 379                 switch (*r) {
 380                         default:
 381                                 warner(
 382                                         packWARN(WARN_ILLEGALPROTO),
 383                                         "Illegal character in prototype for %"SVf" : %s",
 384                                         SVfARG(declarator), r
 385                                 );
 386                                 return;
 387
 388                         case '_':
 389                                 if (r[1] && !strchr(";@%", *r)) {
 390                                         warner(
 391                                                 packWARN(WARN_ILLEGALPROTO),
 392                                                 "Illegal character after '_' in prototype for %"SVf" : %s",
 393                                                 SVfARG(declarator), r
 394                                         );
 395                                         return;
 396                                 }
 397                                 break;
 398
 399                         case '@':
 400                         case '%':
 401                                 if (r[1]) {
 402                                         warner(
 403                                                 packWARN(WARN_ILLEGALPROTO),
 404                                                 "prototype after '%c' for %"SVf": %s",
 405                                                 *r, SVfARG(declarator), r + 1
 406                                         );
 407                                         return;
 408                                 }
 409                                 break;
 410
 411                         case '\\':
 412                                 r++;
 413                                 if (strchr("$@%&*", *r)) {
 414                                         break;
 415                                 }
 416                                 if (*r == '[') {
 417                                         r++;
 418                                         for (; r < end && *r != ']'; r++) {
 419                                                 if (!strchr("$@%&*", *r)) {
 420                                                         break;
 421                                                 }
 422                                         }
 423                                         if (*r == ']' && r[-1] != '[') {
 424                                                 break;
 425                                         }
 426                                 }
 427                                 warner(
 428                                         packWARN(WARN_ILLEGALPROTO),
 429                                         "Illegal character after '\\' in prototype for %"SVf" : %s",
 430                                         SVfARG(declarator), r
 431                                 );
 432                                 return;
 433
 434                         case '$':
 435                         case '*':
 436                         case '&':
 437                         case ';':
 438                         case '+':
 439                                 break;
 440                 }
 441         }
 442 }
 443
 444 static SV *parse_type(pTHX_ Sentinel, const SV *);
 445
 446 static SV *parse_type_paramd(pTHX_ Sentinel sen, const SV *declarator) {
 447         I32 c;
 448         SV *t;
 449
 450         t = my_scan_word(aTHX_ sen, TRUE);
 451         lex_read_space(0);
 452
 453         c = lex_peek_unichar(0);
 454         if (c == '[') {
 455                 SV *u;
 456
 457                 lex_read_unichar(0);
 458                 lex_read_space(0);
 459                 my_sv_cat_c(aTHX_ t, c);
 460
 461                 u = parse_type(aTHX_ sen, declarator);
 462                 sv_catsv(t, u);
 463
 464                 c = lex_peek_unichar(0);
 465                 if (c != ']') {
 466                         croak("In %"SVf": missing ']' after '%"SVf"'", SVfARG(declarator), SVfARG(t));
 467                 }
 468                 lex_read_unichar(0);
 469                 lex_read_space(0);
 470
 471                 my_sv_cat_c(aTHX_ t, c);
 472         }
 473
 474         return t;
 475 }
 476
 477 static SV *parse_type(pTHX_ Sentinel sen, const SV *declarator) {
 478         I32 c;
 479         SV *t;
 480
 481         t = parse_type_paramd(aTHX_ sen, declarator);
 482
 483         c = lex_peek_unichar(0);
 484         while (c == '|') {
 485                 SV *u;
 486
 487                 lex_read_unichar(0);
 488                 lex_read_space(0);
 489
 490                 my_sv_cat_c(aTHX_ t, c);
 491                 u = parse_type_paramd(aTHX_ sen, declarator);
 492                 sv_catsv(t, u);
 493
 494                 c = lex_peek_unichar(0);
 495         }
 496
 497         return t;
 498 }
 499
 500 static SV *reify_type(pTHX_ Sentinel sen, const SV *declarator, SV *name) {
 501         SV *t;
 502         int n;
 503         dSP;
 504
 505         ENTER;
 506         SAVETMPS;
 507
 508         PUSHMARK(SP);
 509         EXTEND(SP, 1);
 510         PUSHs(name);
 511         PUTBACK;
 512
 513         n = call_pv("Moose::Util::TypeConstraints::find_or_create_isa_type_constraint", G_SCALAR);
 514         SPAGAIN;
 515
 516         assert(n == 1);
 517         /* don't warn about n being unused if assert() is compiled out */
 518         n = n;
 519
 520         t = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 521
 522         PUTBACK;
 523         FREETMPS;
 524         LEAVE;
 525
 526         if (!SvTRUE(t)) {
 527                 croak("In %"SVf": undefined type '%"SVf"'", SVfARG(declarator), SVfARG(name));
 528         }
 529
 530         return t;
 531 }
 532
 533
 534 DEFSTRUCT(Param) {
 535         SV *name;
 536         PADOFFSET padoff;
 537         SV *type;
 538 };
 539
 540 DEFSTRUCT(ParamInit) {
 541         Param param;
 542         OpGuard init;
 543 };
 544
 545 #define VEC(B) B ## _Vec
 546
 547 #define DEFVECTOR(B) DEFSTRUCT(VEC(B)) { \
 548         B (*data); \
 549         size_t used, size; \
 550 }
 551
 552 DEFVECTOR(Param);
 553 DEFVECTOR(ParamInit);
 554
 555 #define DEFVECTOR_INIT(N, B) static void N(VEC(B) *p) { \
 556         p->used = 0; \
 557         p->size = 23; \
 558         Newx(p->data, p->size, B); \
 559 } static void N(VEC(B) *)
 560
 561 DEFSTRUCT(ParamSpec) {
 562         Param invocant;
 563         VEC(Param) positional_required;
 564         VEC(ParamInit) positional_optional;
 565         VEC(Param) named_required;
 566         VEC(ParamInit) named_optional;
 567         Param slurpy;
 568         PADOFFSET rest_hash;
 569 };
 570
 571 DEFVECTOR_INIT(pv_init, Param);
 572 DEFVECTOR_INIT(piv_init, ParamInit);
 573
 574 static void p_init(Param *p) {
 575         p->name = NULL;
 576         p->padoff = NOT_IN_PAD;
 577         p->type = NULL;
 578 }
 579
 580 static void ps_init(ParamSpec *ps) {
 581         p_init(&ps->invocant);
 582         pv_init(&ps->positional_required);
 583         piv_init(&ps->positional_optional);
 584         pv_init(&ps->named_required);
 585         piv_init(&ps->named_optional);
 586         p_init(&ps->slurpy);
 587         ps->rest_hash = NOT_IN_PAD;
 588 }
 589
 590 #define DEFVECTOR_EXTEND(N, B) static B (*N(VEC(B) *p)) { \
 591         assert(p->used <= p->size); \
 592         if (p->used == p->size) { \
 593                 const size_t n = p->size / 2 * 3 + 1; \
 594                 Renew(p->data, n, B); \
 595                 p->size = n; \
 596         } \
 597         return &p->data[p->used]; \
 598 } static B (*N(VEC(B) *))
 599
 600 DEFVECTOR_EXTEND(pv_extend, Param);
 601 DEFVECTOR_EXTEND(piv_extend, ParamInit);
 602
 603 #define DEFVECTOR_CLEAR(N, B, F) static void N(pTHX_ VEC(B) *p) { \
 604         while (p->used) { \
 605                 p->used--; \
 606                 F(aTHX_ &p->data[p->used]); \
 607         } \
 608         Safefree(p->data); \
 609         p->data = NULL; \
 610         p->size = 0; \
 611 } static void N(pTHX_ VEC(B) *)
 612
 613 static void p_clear(pTHX_ Param *p) {
 614         p->name = NULL;
 615         p->padoff = NOT_IN_PAD;
 616         p->type = NULL;
 617 }
 618
 619 static void pi_clear(pTHX_ ParamInit *pi) {
 620         p_clear(aTHX_ &pi->param);
 621         op_guard_clear(aTHX_ &pi->init);
 622 }
 623
 624 DEFVECTOR_CLEAR(pv_clear, Param, p_clear);
 625 DEFVECTOR_CLEAR(piv_clear, ParamInit, pi_clear);
 626
 627 static void ps_clear(pTHX_ ParamSpec *ps) {
 628         p_clear(aTHX_ &ps->invocant);
 629
 630         pv_clear(aTHX_ &ps->positional_required);
 631         piv_clear(aTHX_ &ps->positional_optional);
 632
 633         pv_clear(aTHX_ &ps->named_required);
 634         piv_clear(aTHX_ &ps->named_optional);
 635
 636         p_clear(aTHX_ &ps->slurpy);
 637 }
 638
 639 static int ps_contains(pTHX_ const ParamSpec *ps, SV *sv) {
 640         size_t i, lim;
 641
 642         if (ps->invocant.name && sv_eq(sv, ps->invocant.name)) {
 643                 return 1;
 644         }
 645
 646         for (i = 0, lim = ps->positional_required.used; i < lim; i++) {
 647                 if (sv_eq(sv, ps->positional_required.data[i].name)) {
 648                         return 1;
 649                 }
 650         }
 651
 652         for (i = 0, lim = ps->positional_optional.used; i < lim; i++) {
 653                 if (sv_eq(sv, ps->positional_optional.data[i].param.name)) {
 654                         return 1;
 655                 }
 656         }
 657
 658         for (i = 0, lim = ps->named_required.used; i < lim; i++) {
 659                 if (sv_eq(sv, ps->named_required.data[i].name)) {
 660                         return 1;
 661                 }
 662         }
 663
 664         for (i = 0, lim = ps->named_optional.used; i < lim; i++) {
 665                 if (sv_eq(sv, ps->named_optional.data[i].param.name)) {
 666                         return 1;
 667                 }
 668         }
 669
 670         return 0;
 671 }
 672
 673 static void ps_free_void(pTHX_ void *p) {
 674         ps_clear(aTHX_ p);
 675         Safefree(p);
 676 }
 677
 678 static int args_min(pTHX_ const ParamSpec *ps, const KWSpec *ks) {
 679         int n = 0;
 680         if (!ps) {
 681                 return SvTRUE(ks->shift) ? 1 : 0;
 682         }
 683         if (ps->invocant.name) {
 684                 n++;
 685         }
 686         n += ps->positional_required.used;
 687         n += ps->named_required.used * 2;
 688         return n;
 689 }
 690
 691 static int args_max(const ParamSpec *ps) {
 692         int n = 0;
 693         if (!ps) {
 694                 return -1;
 695         }
 696         if (ps->invocant.name) {
 697                 n++;
 698         }
 699         n += ps->positional_required.used;
 700         n += ps->positional_optional.used;
 701         if (ps->named_required.used || ps->named_optional.used || ps->slurpy.name) {
 702                 n = -1;
 703         }
 704         return n;
 705 }
 706
 707 static size_t count_positional_params(const ParamSpec *ps) {
 708         return ps->positional_required.used + ps->positional_optional.used;
 709 }
 710
 711 static size_t count_named_params(const ParamSpec *ps) {
 712         return ps->named_required.used + ps->named_optional.used;
 713 }
 714
 715 static void my_require(pTHX_ const char *file) {
 716         SV *err;
 717         require_pv(file);
 718         err = ERRSV;
 719         if (SvTRUE(err)) {
 720                 croak_sv(err);
 721         }
 722 }
 723
 724 static SV *my_eval(pTHX_ Sentinel sen, I32 floor, OP *op) {
 725         SV *sv;
 726         CV *cv;
 727         dSP;
 728
 729         cv = newATTRSUB(floor, NULL, NULL, NULL, op);
 730
 731         ENTER;
 732         SAVETMPS;
 733
 734         PUSHMARK(SP);
 735         call_sv((SV *)cv, G_SCALAR | G_NOARGS);
 736         SPAGAIN;
 737         sv = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 738
 739         PUTBACK;
 740         FREETMPS;
 741         LEAVE;
 742
 743         return sv;
 744 }
 745
 746 enum {
 747         PARAM_INVOCANT = 0x01,
 748         PARAM_NAMED    = 0x02
 749 };
 750
 751 static PADOFFSET parse_param(
 752         pTHX_
 753         Sentinel sen,
 754         const SV *declarator, const KWSpec *spec, ParamSpec *param_spec,
 755         int *pflags, SV **pname, OpGuard *ginit, SV **ptype
 756 ) {
 757         I32 c;
 758         char sigil;
 759         SV *name;
 760
 761         assert(!ginit->op);
 762         *pflags = 0;
 763         *ptype = NULL;
 764
 765         c = lex_peek_unichar(0);
 766
 767         if (spec->flags & FLAG_TYPES_OK) {
 768                 if (c == '(') {
 769                         I32 floor;
 770                         OP *expr;
 771                         Resource *expr_sentinel;
 772
 773                         lex_read_unichar(0);
 774
 775                         floor = start_subparse(FALSE, 0);
 776                         SAVEFREESV(PL_compcv);
 777                         CvSPECIAL_on(PL_compcv);
 778
 779                         if (!(expr = parse_fullexpr(PARSE_OPTIONAL))) {
 780                                 croak("In %"SVf": invalid type expression", SVfARG(declarator));
 781                         }
 782                         if (MY_OP_SLABBED(expr)) {
 783                                 expr_sentinel = NULL;
 784                         } else {
 785                                 expr_sentinel = sentinel_register(sen, expr, free_op_void);
 786                         }
 787
 788                         lex_read_space(0);
 789                         c = lex_peek_unichar(0);
 790                         if (c != ')') {
 791                                 croak("In %"SVf": missing ')' after type expression", SVfARG(declarator));
 792                         }
 793                         lex_read_unichar(0);
 794                         lex_read_space(0);
 795
 796                         SvREFCNT_inc_simple_void(PL_compcv);
 797                         if (expr_sentinel) {
 798                                 sentinel_disarm(expr_sentinel);
 799                         }
 800                         *ptype = my_eval(aTHX_ sen, floor, expr);
 801                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 802                         if (!sv_isobject(*ptype)) {
 803                                 croak("In %"SVf": (%"SVf") doesn't look like a type object", SVfARG(declarator), SVfARG(*ptype));
 804                         }
 805
 806                         c = lex_peek_unichar(0);
 807                 } else if (MY_UNI_IDFIRST(c)) {
 808                         *ptype = parse_type(aTHX_ sen, declarator);
 809                         my_require(aTHX_ "Moose/Util/TypeConstraints.pm");
 810                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 811
 812                         c = lex_peek_unichar(0);
 813                 }
 814         }
 815
 816         if (c == ':') {
 817                 lex_read_unichar(0);
 818                 lex_read_space(0);
 819
 820                 *pflags |= PARAM_NAMED;
 821
 822                 c = lex_peek_unichar(0);
 823         }
 824
 825         if (c == -1) {
 826                 croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 827         }
 828
 829         if (!(c == '$' || c == '@' || c == '%')) {
 830                 croak("In %"SVf": unexpected '%c' in parameter list (expecting a sigil)", SVfARG(declarator), (int)c);
 831         }
 832
 833         sigil = c;
 834
 835         lex_read_unichar(0);
 836         lex_read_space(0);
 837
 838         if (!(name = my_scan_word(aTHX_ sen, FALSE))) {
 839                 croak("In %"SVf": missing identifier after '%c'", SVfARG(declarator), sigil);
 840         }
 841         sv_insert(name, 0, 0, &sigil, 1);
 842         *pname = name;
 843
 844         lex_read_space(0);
 845         c = lex_peek_unichar(0);
 846
 847         if (c == '=') {
 848                 lex_read_unichar(0);
 849                 lex_read_space(0);
 850
 851
 852                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
 853                         param_spec->invocant.name = spec->shift;
 854                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
 855                 }
 856
 857                 op_guard_update(ginit, parse_termexpr(0));
 858
 859                 lex_read_space(0);
 860                 c = lex_peek_unichar(0);
 861         }
 862
 863         if (c == ':') {
 864                 *pflags |= PARAM_INVOCANT;
 865                 lex_read_unichar(0);
 866                 lex_read_space(0);
 867         } else if (c == ',') {
 868                 lex_read_unichar(0);
 869                 lex_read_space(0);
 870         } else if (c != ')') {
 871                 if (c == -1) {
 872                         croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 873                 }
 874                 croak("In %"SVf": unexpected '%c' in parameter list (expecting ',')", SVfARG(declarator), (int)c);
 875         }
 876
 877         return pad_add_name_sv(*pname, IF_HAVE_PERL_5_16(padadd_NO_DUP_CHECK, 0), NULL, NULL);
 878 }
 879
 880 static OP *my_var_g(pTHX_ I32 type, I32 flags, PADOFFSET padoff) {
 881         OP *var = newOP(type, flags);
 882         var->op_targ = padoff;
 883         return var;
 884 }
 885
 886 static OP *my_var(pTHX_ I32 flags, PADOFFSET padoff) {
 887         return my_var_g(aTHX_ OP_PADSV, flags, padoff);
 888 }
 889
 890 static OP *mkhvelem(pTHX_ PADOFFSET h, OP *k) {
 891         OP *hv = my_var_g(aTHX_ OP_PADHV, OPf_REF, h);
 892         return newBINOP(OP_HELEM, 0, hv, k);
 893 }
 894
 895 static OP *mkconstsv(pTHX_ SV *sv) {
 896         return newSVOP(OP_CONST, 0, sv);
 897 }
 898
 899 static OP *mkconstiv(pTHX_ IV i) {
 900         return mkconstsv(aTHX_ newSViv(i));
 901 }
 902
 903 static OP *mkconstpv(pTHX_ const char *p, size_t n) {
 904         return mkconstsv(aTHX_ newSVpv(p, n));
 905 }
 906
 907 #define mkconstpvs(S) mkconstpv(aTHX_ "" S "", sizeof S - 1)
 908
 909 static OP *mktypecheck(pTHX_ const SV *declarator, int nr, SV *name, PADOFFSET padoff, SV *type) {
 910         /* $type->check($value) or Carp::croak "...: " . $type->get_message($value) */
 911         OP *chk, *err, *msg, *xcroak;
 912
 913         err = mkconstsv(aTHX_ newSVpvf("In %"SVf": parameter %d (%"SVf"): ", SVfARG(declarator), nr, SVfARG(name)));
 914         {
 915                 OP *args = NULL;
 916
 917                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 918                 args = op_append_elem(
 919                         OP_LIST, args,
 920                         padoff == NOT_IN_PAD
 921                                 ? S_newDEFSVOP(aTHX)
 922                                 : my_var(aTHX_ 0, padoff)
 923                 );
 924                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("get_message")));
 925
 926                 msg = args;
 927                 msg->op_type = OP_ENTERSUB;
 928                 msg->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 929                 msg->op_flags |= OPf_STACKED;
 930         }
 931
 932         msg = newBINOP(OP_CONCAT, 0, err, msg);
 933
 934         xcroak = newCVREF(
 935                 OPf_WANT_SCALAR,
 936                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
 937         );
 938         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
 939
 940         {
 941                 OP *args = NULL;
 942
 943                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 944                 args = op_append_elem(
 945                         OP_LIST, args,
 946                         padoff == NOT_IN_PAD
 947                                 ? S_newDEFSVOP(aTHX)
 948                                 : my_var(aTHX_ 0, padoff)
 949                 );
 950                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("check")));
 951
 952                 chk = args;
 953                 chk->op_type = OP_ENTERSUB;
 954                 chk->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 955                 chk->op_flags |= OPf_STACKED;
 956         }
 957
 958         chk = newLOGOP(OP_OR, 0, chk, xcroak);
 959         return chk;
 960 }
 961
 962 static OP *mktypecheckp(pTHX_ const SV *declarator, int nr, const Param *param) {
 963         return mktypecheck(aTHX_ declarator, nr, param->name, param->padoff, param->type);
 964 }
 965
 966 static void register_info(pTHX_ UV key, SV *declarator, const KWSpec *kws, const ParamSpec *ps) {
 967         dSP;
 968
 969         ENTER;
 970         SAVETMPS;
 971
 972         PUSHMARK(SP);
 973         EXTEND(SP, 10);
 974
 975         /* 0 */ {
 976                 mPUSHu(key);
 977         }
 978         /* 1 */ {
 979                 size_t n;
 980                 char *p = SvPV(declarator, n);
 981                 char *q = memchr(p, ' ', n);
 982                 mPUSHp(p, q ? (size_t)(q - p) : n);
 983         }
 984         if (!ps) {
 985                 if (SvTRUE(kws->shift)) {
 986                         PUSHs(kws->shift);
 987                 } else {
 988                         PUSHmortal;
 989                 }
 990                 PUSHmortal;
 991                 mPUSHs(newRV_noinc((SV *)newAV()));
 992                 mPUSHs(newRV_noinc((SV *)newAV()));
 993                 mPUSHs(newRV_noinc((SV *)newAV()));
 994                 mPUSHs(newRV_noinc((SV *)newAV()));
 995                 mPUSHp("@_", 2);
 996                 PUSHmortal;
 997         } else {
 998                 /* 2, 3 */ {
 999                         if (ps->invocant.name) {
1000                                 PUSHs(ps->invocant.name);
1001                                 if (ps->invocant.type) {
1002                                         PUSHs(ps->invocant.type);
1003                                 } else {
1004                                         PUSHmortal;
1005                                 }
1006                         } else {
1007                                 PUSHmortal;
1008                                 PUSHmortal;
1009                         }
1010                 }
1011                 /* 4 */ {
1012                         size_t i, lim;
1013                         AV *av;
1014
1015                         lim = ps->positional_required.used;
1016
1017                         av = newAV();
1018                         if (lim) {
1019                                 av_extend(av, (lim - 1) * 2);
1020                                 for (i = 0; i < lim; i++) {
1021                                         Param *cur = &ps->positional_required.data[i];
1022                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1023                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1024                                 }
1025                         }
1026
1027                         mPUSHs(newRV_noinc((SV *)av));
1028                 }
1029                 /* 5 */ {
1030                         size_t i, lim;
1031                         AV *av;
1032
1033                         lim = ps->positional_optional.used;
1034
1035                         av = newAV();
1036                         if (lim) {
1037                                 av_extend(av, (lim - 1) * 2);
1038                                 for (i = 0; i < lim; i++) {
1039                                         Param *cur = &ps->positional_optional.data[i].param;
1040                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1041                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1042                                 }
1043                         }
1044
1045                         mPUSHs(newRV_noinc((SV *)av));
1046                 }
1047                 /* 6 */ {
1048                         size_t i, lim;
1049                         AV *av;
1050
1051                         lim = ps->named_required.used;
1052
1053                         av = newAV();
1054                         if (lim) {
1055                                 av_extend(av, (lim - 1) * 2);
1056                                 for (i = 0; i < lim; i++) {
1057                                         Param *cur = &ps->named_required.data[i];
1058                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1059                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1060                                 }
1061                         }
1062
1063                         mPUSHs(newRV_noinc((SV *)av));
1064                 }
1065                 /* 7 */ {
1066                         size_t i, lim;
1067                         AV *av;
1068
1069                         lim = ps->named_optional.used;
1070
1071                         av = newAV();
1072                         if (lim) {
1073                                 av_extend(av, (lim - 1) * 2);
1074                                 for (i = 0; i < lim; i++) {
1075                                         Param *cur = &ps->named_optional.data[i].param;
1076                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1077                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1078                                 }
1079                         }
1080
1081                         mPUSHs(newRV_noinc((SV *)av));
1082                 }
1083                 /* 8, 9 */ {
1084                         if (ps->slurpy.name) {
1085                                 PUSHs(ps->slurpy.name);
1086                                 if (ps->slurpy.type) {
1087                                         PUSHs(ps->slurpy.type);
1088                                 } else {
1089                                         PUSHmortal;
1090                                 }
1091                         } else {
1092                                 PUSHmortal;
1093                                 PUSHmortal;
1094                         }
1095                 }
1096         }
1097         PUTBACK;
1098
1099         call_pv(MY_PKG "::_register_info", G_VOID);
1100
1101         FREETMPS;
1102         LEAVE;
1103 }
1104
1105 static int parse_fun(pTHX_ Sentinel sen, OP **pop, const char *keyword_ptr, STRLEN keyword_len, const KWSpec *spec) {
1106         ParamSpec *param_spec;
1107         SV *declarator;
1108         I32 floor_ix;
1109         int save_ix;
1110         SV *saw_name;
1111         OpGuard *prelude_sentinel;
1112         SV *proto;
1113         OpGuard *attrs_sentinel;
1114         OP *body;
1115         unsigned builtin_attrs;
1116         I32 c;
1117
1118         declarator = sentinel_mortalize(sen, newSVpvn(keyword_ptr, keyword_len));
1119
1120         lex_read_space(0);
1121
1122         builtin_attrs = 0;
1123
1124         /* function name */
1125         saw_name = NULL;
1126         if ((spec->flags & FLAG_NAME_OK) && (saw_name = my_scan_word(aTHX_ sen, TRUE))) {
1127
1128                 if (PL_parser->expect != XSTATE) {
1129                         /* bail out early so we don't predeclare $saw_name */
1130                         croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
1131                 }
1132
1133                 sv_catpvs(declarator, " ");
1134                 sv_catsv(declarator, saw_name);
1135
1136                 if (
1137                         sv_eq_pvs(saw_name, "BEGIN") ||
1138                         sv_eq_pvs(saw_name, "END") ||
1139                         sv_eq_pvs(saw_name, "INIT") ||
1140                         sv_eq_pvs(saw_name, "CHECK") ||
1141                         sv_eq_pvs(saw_name, "UNITCHECK")
1142                 ) {
1143                         builtin_attrs |= MY_ATTR_SPECIAL;
1144                 }
1145
1146                 lex_read_space(0);
1147         } else if (!(spec->flags & FLAG_ANON_OK)) {
1148                 croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - PL_parser->bufptr), PL_parser->bufptr);
1149         } else {
1150                 sv_catpvs(declarator, " (anon)");
1151         }
1152
1153         /* we're a subroutine declaration */
1154         floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
1155         SAVEFREESV(PL_compcv);
1156
1157         /* create outer block: '{' */
1158         save_ix = S_block_start(aTHX_ TRUE);
1159
1160         /* initialize synthetic optree */
1161         Newx(prelude_sentinel, 1, OpGuard);
1162         op_guard_init(prelude_sentinel);
1163         sentinel_register(sen, prelude_sentinel, free_op_guard_void);
1164
1165         /* parameters */
1166         param_spec = NULL;
1167
1168         c = lex_peek_unichar(0);
1169         if (c == '(') {
1170                 OpGuard *init_sentinel;
1171
1172                 Newx(init_sentinel, 1, OpGuard);
1173                 op_guard_init(init_sentinel);
1174                 sentinel_register(sen, init_sentinel, free_op_guard_void);
1175
1176                 Newx(param_spec, 1, ParamSpec);
1177                 ps_init(param_spec);
1178                 sentinel_register(sen, param_spec, ps_free_void);
1179
1180                 lex_read_unichar(0);
1181                 lex_read_space(0);
1182
1183                 while ((c = lex_peek_unichar(0)) != ')') {
1184                         int flags;
1185                         SV *name, *type;
1186                         char sigil;
1187                         PADOFFSET padoff;
1188
1189                         padoff = parse_param(aTHX_ sen, declarator, spec, param_spec, &flags, &name, init_sentinel, &type);
1190
1191                         S_intro_my(aTHX);
1192
1193                         sigil = SvPV_nolen(name)[0];
1194
1195                         /* internal consistency */
1196                         if (flags & PARAM_NAMED) {
1197                                 if (flags & PARAM_INVOCANT) {
1198                                         croak("In %"SVf": invocant %"SVf" can't be a named parameter", SVfARG(declarator), SVfARG(name));
1199                                 }
1200                                 if (sigil != '$') {
1201                                         croak("In %"SVf": named parameter %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1202                                 }
1203                         } else if (flags & PARAM_INVOCANT) {
1204                                 if (init_sentinel->op) {
1205                                         croak("In %"SVf": invocant %"SVf" can't have a default value", SVfARG(declarator), SVfARG(name));
1206                                 }
1207                                 if (sigil != '$') {
1208                                         croak("In %"SVf": invocant %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1209                                 }
1210                         } else if (sigil != '$' && init_sentinel->op) {
1211                                 croak("In %"SVf": %s %"SVf" can't have a default value", SVfARG(declarator), sigil == '@' ? "array" : "hash", SVfARG(name));
1212                         }
1213
1214                         /* external constraints */
1215                         if (param_spec->slurpy.name) {
1216                                 croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(param_spec->slurpy.name), SVfARG(name));
1217                         }
1218                         if (sigil != '$') {
1219                                 assert(!init_sentinel->op);
1220                                 param_spec->slurpy.name = name;
1221                                 param_spec->slurpy.padoff = padoff;
1222                                 param_spec->slurpy.type = type;
1223                                 continue;
1224                         }
1225
1226                         if (!(flags & PARAM_NAMED) && count_named_params(param_spec)) {
1227                                 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));
1228                         }
1229
1230                         if (flags & PARAM_INVOCANT) {
1231                                 if (param_spec->invocant.name) {
1232                                         croak("In %"SVf": invalid double invocants %"SVf", %"SVf"", SVfARG(declarator), SVfARG(param_spec->invocant.name), SVfARG(name));
1233                                 }
1234                                 if (count_positional_params(param_spec) || count_named_params(param_spec)) {
1235                                         croak("In %"SVf": invocant %"SVf" must be first in parameter list", SVfARG(declarator), SVfARG(name));
1236                                 }
1237                                 if (!(spec->flags & FLAG_INVOCANT)) {
1238                                         croak("In %"SVf": invocant %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1239                                 }
1240                                 param_spec->invocant.name = name;
1241                                 param_spec->invocant.padoff = padoff;
1242                                 param_spec->invocant.type = type;
1243                                 continue;
1244                         }
1245
1246                         if (init_sentinel->op && !(spec->flags & FLAG_DEFAULT_ARGS)) {
1247                                 croak("In %"SVf": default argument for %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1248                         }
1249
1250                         if (ps_contains(aTHX_ param_spec, name)) {
1251                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(name));
1252                         }
1253
1254                         if (flags & PARAM_NAMED) {
1255                                 if (!(spec->flags & FLAG_NAMED_PARAMS)) {
1256                                         croak("In %"SVf": named parameter :%"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1257                                 }
1258
1259                                 if (init_sentinel->op) {
1260                                         ParamInit *pi = piv_extend(&param_spec->named_optional);
1261                                         pi->param.name = name;
1262                                         pi->param.padoff = padoff;
1263                                         pi->param.type = type;
1264                                         pi->init = op_guard_transfer(init_sentinel);
1265                                         param_spec->named_optional.used++;
1266                                 } else {
1267                                         Param *p;
1268
1269                                         if (param_spec->positional_optional.used) {
1270                                                 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));
1271                                         }
1272
1273                                         p = pv_extend(&param_spec->named_required);
1274                                         p->name = name;
1275                                         p->padoff = padoff;
1276                                         p->type = type;
1277                                         param_spec->named_required.used++;
1278                                 }
1279                         } else {
1280                                 if (init_sentinel->op || param_spec->positional_optional.used) {
1281                                         ParamInit *pi = piv_extend(&param_spec->positional_optional);
1282                                         pi->param.name = name;
1283                                         pi->param.padoff = padoff;
1284                                         pi->param.type = type;
1285                                         pi->init = op_guard_transfer(init_sentinel);
1286                                         param_spec->positional_optional.used++;
1287                                 } else {
1288                                         Param *p = pv_extend(&param_spec->positional_required);
1289                                         p->name = name;
1290                                         p->padoff = padoff;
1291                                         p->type = type;
1292                                         param_spec->positional_required.used++;
1293                                 }
1294                         }
1295
1296                 }
1297                 lex_read_unichar(0);
1298                 lex_read_space(0);
1299
1300                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
1301                         if (ps_contains(aTHX_ param_spec, spec->shift)) {
1302                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(spec->shift));
1303                         }
1304
1305                         param_spec->invocant.name = spec->shift;
1306                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
1307                 }
1308         }
1309
1310         /* prototype */
1311         proto = NULL;
1312         c = lex_peek_unichar(0);
1313         if (c == ':') {
1314                 lex_read_unichar(0);
1315                 lex_read_space(0);
1316
1317                 c = lex_peek_unichar(0);
1318                 if (c != '(') {
1319                         lex_stuff_pvs(":", 0);
1320                         c = ':';
1321                 } else {
1322                         lex_read_unichar(0);
1323                         if (!(proto = my_scan_parens_tail(aTHX_ sen, FALSE))) {
1324                                 croak("In %"SVf": prototype not terminated", SVfARG(declarator));
1325                         }
1326                         my_check_prototype(aTHX_ sen, declarator, proto);
1327                         lex_read_space(0);
1328                         c = lex_peek_unichar(0);
1329                         if (!(c == ':' || c == '{')) {
1330                                 lex_stuff_pvs(":", 0);
1331                                 c = ':';
1332                         }
1333                 }
1334         }
1335
1336         /* attributes */
1337         Newx(attrs_sentinel, 1, OpGuard);
1338         op_guard_init(attrs_sentinel);
1339         sentinel_register(sen, attrs_sentinel, free_op_guard_void);
1340
1341         if (c == ':' || c == '{') /* '}' - hi, vim */ {
1342
1343                 /* kludge default attributes in */
1344                 if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
1345                         lex_stuff_sv(spec->attrs, 0);
1346                         c = ':';
1347                 }
1348
1349                 if (c == ':') {
1350                         lex_read_unichar(0);
1351                         lex_read_space(0);
1352                         c = lex_peek_unichar(0);
1353
1354                         for (;;) {
1355                                 SV *attr;
1356
1357                                 if (!(attr = my_scan_word(aTHX_ sen, FALSE))) {
1358                                         break;
1359                                 }
1360
1361                                 lex_read_space(0);
1362                                 c = lex_peek_unichar(0);
1363
1364                                 if (c != '(') {
1365                                         if (sv_eq_pvs(attr, "lvalue")) {
1366                                                 builtin_attrs |= MY_ATTR_LVALUE;
1367                                                 attr = NULL;
1368                                         } else if (sv_eq_pvs(attr, "method")) {
1369                                                 builtin_attrs |= MY_ATTR_METHOD;
1370                                                 attr = NULL;
1371                                         }
1372                                 } else {
1373                                         SV *sv;
1374                                         lex_read_unichar(0);
1375                                         if (!(sv = my_scan_parens_tail(aTHX_ sen, TRUE))) {
1376                                                 croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
1377                                         }
1378                                         sv_catpvs(attr, "(");
1379                                         sv_catsv(attr, sv);
1380                                         sv_catpvs(attr, ")");
1381
1382                                         lex_read_space(0);
1383                                         c = lex_peek_unichar(0);
1384                                 }
1385
1386                                 if (attr) {
1387                                         op_guard_update(attrs_sentinel, op_append_elem(OP_LIST, attrs_sentinel->op, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(attr))));
1388                                 }
1389
1390                                 if (c == ':') {
1391                                         lex_read_unichar(0);
1392                                         lex_read_space(0);
1393                                         c = lex_peek_unichar(0);
1394                                 }
1395                         }
1396                 }
1397         }
1398
1399         /* body */
1400         if (c != '{') /* '}' - hi, vim */ {
1401                 croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
1402         }
1403
1404         /* surprise predeclaration! */
1405         if (saw_name) {
1406                 /* 'sub NAME (PROTO);' to make name/proto known to perl before it
1407                    starts parsing the body */
1408                 const I32 sub_ix = start_subparse(FALSE, 0);
1409                 SAVEFREESV(PL_compcv);
1410
1411                 SvREFCNT_inc_simple_void(PL_compcv);
1412
1413                 newATTRSUB(
1414                         sub_ix,
1415                         mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(saw_name)),
1416                         proto ? mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(proto)) : NULL,
1417                         NULL,
1418                         NULL
1419                 );
1420         }
1421
1422         if (builtin_attrs & MY_ATTR_LVALUE) {
1423                 CvLVALUE_on(PL_compcv);
1424         }
1425         if (builtin_attrs & MY_ATTR_METHOD) {
1426                 CvMETHOD_on(PL_compcv);
1427         }
1428         if (builtin_attrs & MY_ATTR_SPECIAL) {
1429                 CvSPECIAL_on(PL_compcv);
1430         }
1431
1432         /* check number of arguments */
1433         if (spec->flags & FLAG_CHECK_NARGS) {
1434                 int amin, amax;
1435
1436                 amin = args_min(aTHX_ param_spec, spec);
1437                 if (amin > 0) {
1438                         OP *chk, *cond, *err, *xcroak;
1439
1440                         err = mkconstsv(aTHX_ newSVpvf("Not enough arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amin));
1441                         err = newBINOP(
1442                                 OP_CONCAT, 0,
1443                                 err,
1444                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1445                         );
1446                         err = newBINOP(
1447                                 OP_CONCAT, 0,
1448                                 err,
1449                                 mkconstpvs(")")
1450                         );
1451
1452                         xcroak = newCVREF(OPf_WANT_SCALAR,
1453                                           newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV)));
1454                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1455                                       op_append_elem(OP_LIST, err, xcroak));
1456
1457                         cond = newBINOP(OP_LT, 0,
1458                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1459                                         mkconstiv(aTHX_ amin));
1460                         chk = newLOGOP(OP_AND, 0, cond, err);
1461
1462                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1463                 }
1464
1465                 amax = args_max(param_spec);
1466                 if (amax >= 0) {
1467                         OP *chk, *cond, *err, *xcroak;
1468
1469                         err = mkconstsv(aTHX_ newSVpvf("Too many arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amax));
1470                         err = newBINOP(
1471                                 OP_CONCAT, 0,
1472                                 err,
1473                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1474                         );
1475                         err = newBINOP(
1476                                 OP_CONCAT, 0,
1477                                 err,
1478                                 mkconstpvs(")")
1479                         );
1480
1481                         xcroak = newCVREF(
1482                                 OPf_WANT_SCALAR,
1483                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1484                         );
1485                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1486                         op_append_elem(OP_LIST, err, xcroak));
1487
1488                         cond = newBINOP(
1489                                 OP_GT, 0,
1490                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1491                                 mkconstiv(aTHX_ amax)
1492                         );
1493                         chk = newLOGOP(OP_AND, 0, cond, err);
1494
1495                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1496                 }
1497
1498                 if (param_spec && (count_named_params(param_spec) || (param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%'))) {
1499                         OP *chk, *cond, *err, *xcroak;
1500                         const UV fixed = count_positional_params(param_spec) + !!param_spec->invocant.name;
1501
1502                         err = mkconstsv(aTHX_ newSVpvf("Odd number of paired arguments for %"SVf"", SVfARG(declarator)));
1503
1504                         xcroak = newCVREF(
1505                                 OPf_WANT_SCALAR,
1506                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1507                         );
1508                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1509                         op_append_elem(OP_LIST, err, xcroak));
1510
1511                         cond = newBINOP(OP_GT, 0,
1512                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1513                                         mkconstiv(aTHX_ fixed));
1514                         cond = newLOGOP(OP_AND, 0,
1515                                         cond,
1516                                         newBINOP(OP_MODULO, 0,
1517                                                  fixed
1518                                                  ? newBINOP(OP_SUBTRACT, 0,
1519                                                             newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1520                                                             mkconstiv(aTHX_ fixed))
1521                                                  : newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1522                                                  mkconstiv(aTHX_ 2)));
1523                         chk = newLOGOP(OP_AND, 0, cond, err);
1524
1525                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1526                 }
1527         }
1528
1529         if (!param_spec) {
1530                 /* my $invocant = shift; */
1531                 if (SvTRUE(spec->shift)) {
1532                         OP *var;
1533
1534                         var = my_var(
1535                                 aTHX_
1536                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1537                                 pad_add_name_sv(spec->shift, 0, NULL, NULL)
1538                         );
1539                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1540
1541                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1542                 }
1543         } else {
1544                 /* my $invocant = shift; */
1545                 if (param_spec->invocant.name) {
1546                         OP *var;
1547
1548                         var = my_var(
1549                                 aTHX_
1550                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1551                                 param_spec->invocant.padoff
1552                         );
1553                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1554
1555                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1556
1557                         if (param_spec->invocant.type && (spec->flags & FLAG_CHECK_TARGS)) {
1558                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, 0, &param_spec->invocant))));
1559                         }
1560                 }
1561
1562                 /* my (...) = @_; */
1563                 {
1564                         OP *lhs;
1565                         size_t i, lim;
1566
1567                         lhs = NULL;
1568
1569                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1570                                 OP *const var = my_var(
1571                                         aTHX_
1572                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1573                                         param_spec->positional_required.data[i].padoff
1574                                 );
1575                                 lhs = op_append_elem(OP_LIST, lhs, var);
1576                         }
1577
1578                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1579                                 OP *const var = my_var(
1580                                         aTHX_
1581                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1582                                         param_spec->positional_optional.data[i].param.padoff
1583                                 );
1584                                 lhs = op_append_elem(OP_LIST, lhs, var);
1585                         }
1586
1587                         {
1588                                 PADOFFSET padoff;
1589                                 I32 type;
1590                                 bool slurpy_hash;
1591
1592                                 /*
1593                                  * cases:
1594                                  *  1) no named params
1595                                  *   1.1) slurpy
1596                                  *       => put it in
1597                                  *   1.2) no slurpy
1598                                  *       => nop
1599                                  *  2) named params
1600                                  *   2.1) no slurpy
1601                                  *       => synthetic %{rest}
1602                                  *   2.2) slurpy is a hash
1603                                  *       => put it in
1604                                  *   2.3) slurpy is an array
1605                                  *       => synthetic %{rest}
1606                                  *          remember to declare array later
1607                                  */
1608
1609                                 slurpy_hash = param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%';
1610                                 if (!count_named_params(param_spec)) {
1611                                         if (param_spec->slurpy.name) {
1612                                                 padoff = param_spec->slurpy.padoff;
1613                                                 type = slurpy_hash ? OP_PADHV : OP_PADAV;
1614                                         } else {
1615                                                 padoff = NOT_IN_PAD;
1616                                                 type = OP_PADSV;
1617                                         }
1618                                 } else if (slurpy_hash) {
1619                                         padoff = param_spec->slurpy.padoff;
1620                                         type = OP_PADHV;
1621                                 } else {
1622                                         padoff = param_spec->rest_hash = pad_add_name_pvs("%{rest}", 0, NULL, NULL);
1623                                         type = OP_PADHV;
1624                                 }
1625
1626                                 if (padoff != NOT_IN_PAD) {
1627                                         OP *const var = my_var_g(
1628                                                 aTHX_
1629                                                 type,
1630                                                 OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1631                                                 padoff
1632                                         );
1633
1634                                         lhs = op_append_elem(OP_LIST, lhs, var);
1635
1636                                         if (type == OP_PADHV) {
1637                                                 param_spec->rest_hash = padoff;
1638                                         }
1639                                 }
1640                         }
1641
1642                         if (lhs) {
1643                                 OP *rhs;
1644                                 lhs->op_flags |= OPf_PARENS;
1645                                 rhs = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
1646
1647                                 op_guard_update(prelude_sentinel, op_append_list(
1648                                         OP_LINESEQ, prelude_sentinel->op,
1649                                         newSTATEOP(
1650                                                 0, NULL,
1651                                                 newASSIGNOP(OPf_STACKED, lhs, 0, rhs)
1652                                         )
1653                                 ));
1654                         }
1655                 }
1656
1657                 /* default positional arguments */
1658                 {
1659                         size_t i, lim, req;
1660                         OP *nest;
1661
1662                         nest = NULL;
1663
1664                         req = param_spec->positional_required.used;
1665                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1666                                 ParamInit *cur = &param_spec->positional_optional.data[i];
1667                                 OP *var, *cond;
1668
1669                                 cond = newBINOP(
1670                                         OP_LT, 0,
1671                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1672                                         mkconstiv(aTHX_ req + i + 1)
1673                                 );
1674
1675                                 var = my_var(aTHX_ 0, cur->param.padoff);
1676
1677                                 nest = op_append_list(
1678                                         OP_LINESEQ, nest,
1679                                         newASSIGNOP(OPf_STACKED, var, 0, op_guard_relinquish(&cur->init))
1680                                 );
1681                                 nest = newCONDOP(
1682                                         0,
1683                                         cond,
1684                                         nest,
1685                                         NULL
1686                                 );
1687                         }
1688
1689                         op_guard_update(prelude_sentinel, op_append_list(
1690                                 OP_LINESEQ, prelude_sentinel->op,
1691                                 nest
1692                         ));
1693                 }
1694
1695                 /* named parameters */
1696                 if (count_named_params(param_spec)) {
1697                         size_t i, lim;
1698
1699                         assert(param_spec->rest_hash != NOT_IN_PAD);
1700
1701                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1702                                 Param *cur = &param_spec->named_required.data[i];
1703                                 size_t n;
1704                                 char *p = SvPV(cur->name, n);
1705                                 OP *var, *cond;
1706
1707                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1708
1709                                 if (spec->flags & FLAG_CHECK_NARGS) {
1710                                         OP *xcroak, *msg;
1711
1712                                         var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1713                                         var = newUNOP(OP_DELETE, 0, var);
1714
1715                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": missing named parameter: %.*s", SVfARG(declarator), (int)(n - 1), p + 1));
1716                                         xcroak = newCVREF(
1717                                                 OPf_WANT_SCALAR,
1718                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1719                                         );
1720                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1721
1722                                         cond = newUNOP(OP_EXISTS, 0, cond);
1723
1724                                         cond = newCONDOP(0, cond, var, xcroak);
1725                                 }
1726
1727                                 var = my_var(
1728                                         aTHX_
1729                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1730                                         cur->padoff
1731                                 );
1732                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1733
1734                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1735                         }
1736
1737                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1738                                 ParamInit *cur = &param_spec->named_optional.data[i];
1739                                 size_t n;
1740                                 char *p = SvPV(cur->param.name, n);
1741                                 OP *var, *cond;
1742
1743                                 var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1744                                 var = newUNOP(OP_DELETE, 0, var);
1745
1746                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1747                                 cond = newUNOP(OP_EXISTS, 0, cond);
1748
1749                                 cond = newCONDOP(0, cond, var, op_guard_relinquish(&cur->init));
1750
1751                                 var = my_var(
1752                                         aTHX_
1753                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1754                                         cur->param.padoff
1755                                 );
1756                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1757
1758                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1759                         }
1760
1761                         if (!param_spec->slurpy.name) {
1762                                 if (spec->flags & FLAG_CHECK_NARGS) {
1763                                         /* croak if %{rest} */
1764                                         OP *xcroak, *cond, *keys, *msg;
1765
1766                                         keys = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1767                                         keys = newLISTOP(OP_SORT, 0, newOP(OP_PUSHMARK, 0), keys);
1768                                         {
1769                                                 OP *first, *mid, *last;
1770
1771                                                 last = keys;
1772
1773                                                 mid = mkconstpvs(", ");
1774                                                 mid->op_sibling = last;
1775
1776                                                 first = newOP(OP_PUSHMARK, 0);
1777
1778                                                 keys = newLISTOP(OP_JOIN, 0, first, mid);
1779                                                 keys->op_targ = pad_alloc(OP_JOIN, SVs_PADTMP);
1780                                                 ((LISTOP *)keys)->op_last = last;
1781                                         }
1782
1783                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": no such named parameter: ", SVfARG(declarator)));
1784                                         msg = newBINOP(OP_CONCAT, 0, msg, keys);
1785
1786                                         xcroak = newCVREF(
1787                                                 OPf_WANT_SCALAR,
1788                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1789                                         );
1790                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1791
1792                                         cond = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1793                                         xcroak = newCONDOP(0, cond, xcroak, NULL);
1794
1795                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, xcroak)));
1796                                 } else {
1797                                         OP *clear;
1798
1799                                         clear = newASSIGNOP(
1800                                                 OPf_STACKED,
1801                                                 my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1802                                                 0,
1803                                                 newNULLLIST()
1804                                         );
1805
1806                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, clear)));
1807                                 }
1808                         } else if (param_spec->slurpy.padoff != param_spec->rest_hash) {
1809                                 OP *var, *clear;
1810
1811                                 assert(SvPV_nolen(param_spec->slurpy.name)[0] == '@');
1812
1813                                 var = my_var_g(
1814                                         aTHX_
1815                                         OP_PADAV,
1816                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1817                                         param_spec->slurpy.padoff
1818                                 );
1819
1820                                 var = newASSIGNOP(OPf_STACKED, var, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1821
1822                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1823
1824                                 clear = newASSIGNOP(
1825                                         OPf_STACKED,
1826                                         my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1827                                         0,
1828                                         newNULLLIST()
1829                                 );
1830
1831                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, clear)));
1832                         }
1833                 }
1834
1835                 if (spec->flags & FLAG_CHECK_TARGS) {
1836                         size_t i, lim, base;
1837
1838                         base = 1;
1839                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1840                                 Param *cur = &param_spec->positional_required.data[i];
1841
1842                                 if (cur->type) {
1843                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1844                                 }
1845                         }
1846                         base += i;
1847
1848                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1849                                 Param *cur = &param_spec->positional_optional.data[i].param;
1850
1851                                 if (cur->type) {
1852                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1853                                 }
1854                         }
1855                         base += i;
1856
1857                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1858                                 Param *cur = &param_spec->named_required.data[i];
1859
1860                                 if (cur->type) {
1861                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1862                                 }
1863                         }
1864                         base += i;
1865
1866                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1867                                 Param *cur = &param_spec->named_optional.data[i].param;
1868
1869                                 if (cur->type) {
1870                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1871                                 }
1872                         }
1873                         base += i;
1874
1875                         if (param_spec->slurpy.type) {
1876                                 /* $type->valid($_) or croak $type->get_message($_) for @rest / values %rest */
1877                                 OP *check, *list, *loop;
1878
1879                                 check = mktypecheck(aTHX_ declarator, base, param_spec->slurpy.name, NOT_IN_PAD, param_spec->slurpy.type);
1880
1881                                 if (SvPV_nolen(param_spec->slurpy.name)[0] == '@') {
1882                                         list = my_var_g(aTHX_ OP_PADAV, 0, param_spec->slurpy.padoff);
1883                                 } else {
1884                                         list = my_var_g(aTHX_ OP_PADHV, 0, param_spec->slurpy.padoff);
1885                                         list = newUNOP(OP_VALUES, 0, list);
1886                                 }
1887
1888                                 loop = newFOROP(0, NULL, list, check, NULL);
1889
1890                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, loop)));
1891                         }
1892                 }
1893         }
1894
1895         /* finally let perl parse the actual subroutine body */
1896         body = parse_block(0);
1897
1898         /* add '();' to make function return nothing by default */
1899         /* (otherwise the invisible parameter initialization can "leak" into
1900            the return value: fun ($x) {}->("asdf", 0) == 2) */
1901         if (prelude_sentinel->op) {
1902                 body = newSTATEOP(0, NULL, body);
1903         }
1904
1905         body = op_append_list(OP_LINESEQ, op_guard_relinquish(prelude_sentinel), body);
1906
1907         /* it's go time. */
1908         {
1909                 CV *cv;
1910                 OP *const attrs = op_guard_relinquish(attrs_sentinel);
1911
1912                 SvREFCNT_inc_simple_void(PL_compcv);
1913
1914                 /* close outer block: '}' */
1915                 S_block_end(aTHX_ save_ix, body);
1916
1917                 cv = newATTRSUB(
1918                         floor_ix,
1919                         saw_name ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)) : NULL,
1920                         proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
1921                         attrs,
1922                         body
1923                 );
1924
1925                 if (cv) {
1926                         register_info(aTHX_ PTR2UV(CvROOT(cv)), declarator, spec, param_spec);
1927                 }
1928
1929                 if (saw_name) {
1930                         *pop = newOP(OP_NULL, 0);
1931                         return KEYWORD_PLUGIN_STMT;
1932                 }
1933
1934                 *pop = newUNOP(
1935                         OP_REFGEN, 0,
1936                         newSVOP(
1937                                 OP_ANONCODE, 0,
1938                                 (SV *)cv
1939                         )
1940                 );
1941                 return KEYWORD_PLUGIN_EXPR;
1942         }
1943 }
1944
1945 static int kw_flags_enter(pTHX_ Sentinel sen, const char *kw_ptr, STRLEN kw_len, KWSpec *spec) {
1946         HV *hints;
1947         SV *sv, **psv;
1948         const char *p, *kw_active;
1949         STRLEN kw_active_len;
1950
1951         if (!(hints = GvHV(PL_hintgv))) {
1952                 return FALSE;
1953         }
1954         if (!(psv = hv_fetchs(hints, HINTK_KEYWORDS, 0))) {
1955                 return FALSE;
1956         }
1957         sv = *psv;
1958         kw_active = SvPV(sv, kw_active_len);
1959         if (kw_active_len <= kw_len) {
1960                 return FALSE;
1961         }
1962         for (
1963                 p = kw_active;
1964                 (p = strchr(p, *kw_ptr)) &&
1965                 p < kw_active + kw_active_len - kw_len;
1966                 p++
1967         ) {
1968                 if (
1969                         (p == kw_active || p[-1] == ' ') &&
1970                         p[kw_len] == ' ' &&
1971                         memcmp(kw_ptr, p, kw_len) == 0
1972                 ) {
1973                         ENTER;
1974                         SAVETMPS;
1975
1976                         SAVEDESTRUCTOR_X(sentinel_clear_void, sen);
1977
1978                         spec->flags = 0;
1979                         spec->shift = sentinel_mortalize(sen, newSVpvs(""));
1980                         spec->attrs = sentinel_mortalize(sen, newSVpvs(""));
1981
1982 #define FETCH_HINTK_INTO(NAME, PTR, LEN, X) STMT_START { \
1983         const char *fk_ptr_; \
1984         STRLEN fk_len_; \
1985         SV *fk_sv_; \
1986         fk_sv_ = sentinel_mortalize(sen, newSVpvs(HINTK_ ## NAME)); \
1987         sv_catpvn(fk_sv_, PTR, LEN); \
1988         fk_ptr_ = SvPV(fk_sv_, fk_len_); \
1989         if (!((X) = hv_fetch(hints, fk_ptr_, fk_len_, 0))) { \
1990                 croak("%s: internal error: $^H{'%.*s'} not set", MY_PKG, (int)fk_len_, fk_ptr_); \
1991         } \
1992 } STMT_END
1993
1994                         FETCH_HINTK_INTO(FLAGS_, kw_ptr, kw_len, psv);
1995                         spec->flags = SvIV(*psv);
1996
1997                         FETCH_HINTK_INTO(SHIFT_, kw_ptr, kw_len, psv);
1998                         SvSetSV(spec->shift, *psv);
1999
2000                         FETCH_HINTK_INTO(ATTRS_, kw_ptr, kw_len, psv);
2001                         SvSetSV(spec->attrs, *psv);
2002
2003 #undef FETCH_HINTK_INTO
2004                         return TRUE;
2005                 }
2006         }
2007         return FALSE;
2008 }
2009
2010 static int my_keyword_plugin(pTHX_ char *keyword_ptr, STRLEN keyword_len, OP **op_ptr) {
2011         Sentinel sen = { NULL };
2012         KWSpec spec;
2013         int ret;
2014
2015         if (kw_flags_enter(aTHX_ sen, keyword_ptr, keyword_len, &spec)) {
2016                 /* scope was entered, 'sen' and 'spec' are initialized */
2017                 ret = parse_fun(aTHX_ sen, op_ptr, keyword_ptr, keyword_len, &spec);
2018                 FREETMPS;
2019                 LEAVE;
2020         } else {
2021                 /* not one of our keywords, no allocation done */
2022                 ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
2023         }
2024
2025         return ret;
2026 }
2027
2028 WARNINGS_RESET
2029
2030 MODULE = Function::Parameters   PACKAGE = Function::Parameters   PREFIX = fp_
2031 PROTOTYPES: ENABLE
2032
2033 UV
2034 fp__cv_root(sv)
2035         SV * sv
2036         PREINIT:
2037                 CV *xcv;
2038                 HV *hv;
2039                 GV *gv;
2040         CODE:
2041                 xcv = sv_2cv(sv, &hv, &gv, 0);
2042                 RETVAL = PTR2UV(xcv ? CvROOT(xcv) : NULL);
2043         OUTPUT:
2044                 RETVAL
2045
2046 BOOT:
2047 WARNINGS_ENABLE {
2048         HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
2049         /**/
2050         newCONSTSUB(stash, "FLAG_NAME_OK",      newSViv(FLAG_NAME_OK));
2051         newCONSTSUB(stash, "FLAG_ANON_OK",      newSViv(FLAG_ANON_OK));
2052         newCONSTSUB(stash, "FLAG_DEFAULT_ARGS", newSViv(FLAG_DEFAULT_ARGS));
2053         newCONSTSUB(stash, "FLAG_CHECK_NARGS",  newSViv(FLAG_CHECK_NARGS));
2054         newCONSTSUB(stash, "FLAG_INVOCANT",     newSViv(FLAG_INVOCANT));
2055         newCONSTSUB(stash, "FLAG_NAMED_PARAMS", newSViv(FLAG_NAMED_PARAMS));
2056         newCONSTSUB(stash, "FLAG_TYPES_OK",     newSViv(FLAG_TYPES_OK));
2057         newCONSTSUB(stash, "FLAG_CHECK_TARGS",  newSViv(FLAG_CHECK_TARGS));
2058         newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
2059         newCONSTSUB(stash, "HINTK_FLAGS_",   newSVpvs(HINTK_FLAGS_));
2060         newCONSTSUB(stash, "HINTK_SHIFT_",   newSVpvs(HINTK_SHIFT_));
2061         newCONSTSUB(stash, "HINTK_ATTRS_",   newSVpvs(HINTK_ATTRS_));
2062         /**/
2063         next_keyword_plugin = PL_keyword_plugin;
2064         PL_keyword_plugin = my_keyword_plugin;
2065 } WARNINGS_RESET