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 #define HINTK_REIFY_   MY_PKG "/reify:"
  89
  90 #define DEFSTRUCT(T) typedef struct T T; struct T
  91
  92 #define UV_BITS (sizeof (UV) * CHAR_BIT)
  93
  94 enum {
  95         FLAG_NAME_OK      = 0x01,
  96         FLAG_ANON_OK      = 0x02,
  97         FLAG_DEFAULT_ARGS = 0x04,
  98         FLAG_CHECK_NARGS  = 0x08,
  99         FLAG_INVOCANT     = 0x10,
 100         FLAG_NAMED_PARAMS = 0x20,
 101         FLAG_TYPES_OK     = 0x40,
 102         FLAG_CHECK_TARGS  = 0x80
 103 };
 104
 105 DEFSTRUCT(KWSpec) {
 106         unsigned flags;
 107         I32 reify_type;
 108         SV *shift;
 109         SV *attrs;
 110 };
 111
 112 static int (*next_keyword_plugin)(pTHX_ char *, STRLEN, OP **);
 113
 114 DEFSTRUCT(Resource) {
 115         Resource *next;
 116         void *data;
 117         void (*destroy)(pTHX_ void *);
 118 };
 119
 120 typedef Resource *Sentinel[1];
 121
 122 static void sentinel_clear_void(pTHX_ void *p) {
 123         Resource **pp = p;
 124         while (*pp) {
 125                 Resource *cur = *pp;
 126                 if (cur->destroy) {
 127                         cur->destroy(aTHX_ cur->data);
 128                 }
 129                 cur->data = (void *)"no";
 130                 cur->destroy = NULL;
 131                 *pp = cur->next;
 132                 Safefree(cur);
 133         }
 134 }
 135
 136 static Resource *sentinel_register(Sentinel sen, void *data, void (*destroy)(pTHX_ void *)) {
 137         Resource *cur;
 138
 139         Newx(cur, 1, Resource);
 140         cur->data = data;
 141         cur->destroy = destroy;
 142         cur->next = *sen;
 143         *sen = cur;
 144
 145         return cur;
 146 }
 147
 148 static void sentinel_disarm(Resource *p) {
 149         p->destroy = NULL;
 150 }
 151
 152 static void my_sv_refcnt_dec_void(pTHX_ void *p) {
 153         SV *sv = p;
 154         SvREFCNT_dec(sv);
 155 }
 156
 157 static SV *sentinel_mortalize(Sentinel sen, SV *sv) {
 158         sentinel_register(sen, sv, my_sv_refcnt_dec_void);
 159         return sv;
 160 }
 161
 162
 163 #if HAVE_PERL_VERSION(5, 17, 2)
 164  #define MY_OP_SLABBED(O) ((O)->op_slabbed)
 165 #else
 166  #define MY_OP_SLABBED(O) 0
 167 #endif
 168
 169 DEFSTRUCT(OpGuard) {
 170         OP *op;
 171         bool needs_freed;
 172 };
 173
 174 static void op_guard_init(OpGuard *p) {
 175         p->op = NULL;
 176         p->needs_freed = FALSE;
 177 }
 178
 179 static OpGuard op_guard_transfer(OpGuard *p) {
 180         OpGuard r = *p;
 181         op_guard_init(p);
 182         return r;
 183 }
 184
 185 static OP *op_guard_relinquish(OpGuard *p) {
 186         OP *o = p->op;
 187         op_guard_init(p);
 188         return o;
 189 }
 190
 191 static void op_guard_update(OpGuard *p, OP *o) {
 192         p->op = o;
 193         p->needs_freed = o && !MY_OP_SLABBED(o);
 194 }
 195
 196 static void op_guard_clear(pTHX_ OpGuard *p) {
 197         if (p->needs_freed) {
 198                 op_free(p->op);
 199         }
 200 }
 201
 202 static void free_op_guard_void(pTHX_ void *vp) {
 203         OpGuard *p = vp;
 204         op_guard_clear(aTHX_ p);
 205         Safefree(p);
 206 }
 207
 208 static void free_op_void(pTHX_ void *vp) {
 209         OP *p = vp;
 210         op_free(p);
 211 }
 212
 213 #define sv_eq_pvs(SV, S) my_sv_eq_pvn(aTHX_ SV, "" S "", sizeof (S) - 1)
 214
 215 static int my_sv_eq_pvn(pTHX_ SV *sv, const char *p, STRLEN n) {
 216         STRLEN sv_len;
 217         const char *sv_p = SvPV(sv, sv_len);
 218         return memcmp(sv_p, p, n) == 0;
 219 }
 220
 221
 222 #include "padop_on_crack.c.inc"
 223
 224
 225 enum {
 226         MY_ATTR_LVALUE = 0x01,
 227         MY_ATTR_METHOD = 0x02,
 228         MY_ATTR_SPECIAL = 0x04
 229 };
 230
 231 static void my_sv_cat_c(pTHX_ SV *sv, U32 c) {
 232         char ds[UTF8_MAXBYTES + 1], *d;
 233         d = (char *)uvchr_to_utf8((U8 *)ds, c);
 234         if (d - ds > 1) {
 235                 sv_utf8_upgrade(sv);
 236         }
 237         sv_catpvn(sv, ds, d - ds);
 238 }
 239
 240
 241 #define MY_UNI_IDFIRST(C) isIDFIRST_uni(C)
 242 #define MY_UNI_IDCONT(C)  isALNUM_uni(C)
 243
 244 static SV *my_scan_word(pTHX_ Sentinel sen, bool allow_package) {
 245         bool at_start, at_substart;
 246         I32 c;
 247         SV *sv = sentinel_mortalize(sen, newSVpvs(""));
 248         if (lex_bufutf8()) {
 249                 SvUTF8_on(sv);
 250         }
 251
 252         at_start = at_substart = TRUE;
 253         c = lex_peek_unichar(0);
 254
 255         while (c != -1) {
 256                 if (at_substart ? MY_UNI_IDFIRST(c) : MY_UNI_IDCONT(c)) {
 257                         lex_read_unichar(0);
 258                         my_sv_cat_c(aTHX_ sv, c);
 259                         at_substart = FALSE;
 260                         c = lex_peek_unichar(0);
 261                 } else if (allow_package && !at_substart && c == '\'') {
 262                         lex_read_unichar(0);
 263                         c = lex_peek_unichar(0);
 264                         if (!MY_UNI_IDFIRST(c)) {
 265                                 lex_stuff_pvs("'", 0);
 266                                 break;
 267                         }
 268                         sv_catpvs(sv, "'");
 269                         at_substart = TRUE;
 270                 } else if (allow_package && (at_start || !at_substart) && c == ':') {
 271                         lex_read_unichar(0);
 272                         if (lex_peek_unichar(0) != ':') {
 273                                 lex_stuff_pvs(":", 0);
 274                                 break;
 275                         }
 276                         lex_read_unichar(0);
 277                         c = lex_peek_unichar(0);
 278                         if (!MY_UNI_IDFIRST(c)) {
 279                                 lex_stuff_pvs("::", 0);
 280                                 break;
 281                         }
 282                         sv_catpvs(sv, "::");
 283                         at_substart = TRUE;
 284                 } else {
 285                         break;
 286                 }
 287                 at_start = FALSE;
 288         }
 289
 290         return SvCUR(sv) ? sv : NULL;
 291 }
 292
 293 static SV *my_scan_parens_tail(pTHX_ Sentinel sen, bool keep_backslash) {
 294         I32 c, nesting;
 295         SV *sv;
 296         line_t start;
 297
 298         start = CopLINE(PL_curcop);
 299
 300         sv = sentinel_mortalize(sen, newSVpvs(""));
 301         if (lex_bufutf8()) {
 302                 SvUTF8_on(sv);
 303         }
 304
 305         nesting = 0;
 306         for (;;) {
 307                 c = lex_read_unichar(0);
 308                 if (c == EOF) {
 309                         CopLINE_set(PL_curcop, start);
 310                         return NULL;
 311                 }
 312
 313                 if (c == '\\') {
 314                         c = lex_read_unichar(0);
 315                         if (c == EOF) {
 316                                 CopLINE_set(PL_curcop, start);
 317                                 return NULL;
 318                         }
 319                         if (keep_backslash || (c != '(' && c != ')')) {
 320                                 sv_catpvs(sv, "\\");
 321                         }
 322                 } else if (c == '(') {
 323                         nesting++;
 324                 } else if (c == ')') {
 325                         if (!nesting) {
 326                                 break;
 327                         }
 328                         nesting--;
 329                 }
 330
 331                 my_sv_cat_c(aTHX_ sv, c);
 332         }
 333
 334         return sv;
 335 }
 336
 337 static void my_check_prototype(pTHX_ Sentinel sen, const SV *declarator, SV *proto) {
 338         char *start, *r, *w, *end;
 339         STRLEN len;
 340
 341         /* strip spaces */
 342         start = SvPV(proto, len);
 343         end = start + len;
 344
 345         for (w = r = start; r < end; r++) {
 346                 if (!isSPACE(*r)) {
 347                         *w++ = *r;
 348                 }
 349         }
 350         *w = '\0';
 351         SvCUR_set(proto, w - start);
 352         end = w;
 353         len = end - start;
 354
 355         if (!ckWARN(WARN_ILLEGALPROTO)) {
 356                 return;
 357         }
 358
 359         /* check for bad characters */
 360         if (strspn(start, "$@%*;[]&\\_+") != len) {
 361                 SV *dsv = sentinel_mortalize(sen, newSVpvs(""));
 362                 warner(
 363                         packWARN(WARN_ILLEGALPROTO),
 364                         "Illegal character in prototype for %"SVf" : %s",
 365                         SVfARG(declarator),
 366                         SvUTF8(proto)
 367                                 ? sv_uni_display(
 368                                         dsv,
 369                                         proto,
 370                                         len,
 371                                         UNI_DISPLAY_ISPRINT
 372                                 )
 373                                 : pv_pretty(dsv, start, len, 60, NULL, NULL,
 374                                         PERL_PV_ESCAPE_NONASCII
 375                                 )
 376                 );
 377                 return;
 378         }
 379
 380         for (r = start; r < end; r++) {
 381                 switch (*r) {
 382                         default:
 383                                 warner(
 384                                         packWARN(WARN_ILLEGALPROTO),
 385                                         "Illegal character in prototype for %"SVf" : %s",
 386                                         SVfARG(declarator), r
 387                                 );
 388                                 return;
 389
 390                         case '_':
 391                                 if (r[1] && !strchr(";@%", *r)) {
 392                                         warner(
 393                                                 packWARN(WARN_ILLEGALPROTO),
 394                                                 "Illegal character after '_' in prototype for %"SVf" : %s",
 395                                                 SVfARG(declarator), r
 396                                         );
 397                                         return;
 398                                 }
 399                                 break;
 400
 401                         case '@':
 402                         case '%':
 403                                 if (r[1]) {
 404                                         warner(
 405                                                 packWARN(WARN_ILLEGALPROTO),
 406                                                 "prototype after '%c' for %"SVf": %s",
 407                                                 *r, SVfARG(declarator), r + 1
 408                                         );
 409                                         return;
 410                                 }
 411                                 break;
 412
 413                         case '\\':
 414                                 r++;
 415                                 if (strchr("$@%&*", *r)) {
 416                                         break;
 417                                 }
 418                                 if (*r == '[') {
 419                                         r++;
 420                                         for (; r < end && *r != ']'; r++) {
 421                                                 if (!strchr("$@%&*", *r)) {
 422                                                         break;
 423                                                 }
 424                                         }
 425                                         if (*r == ']' && r[-1] != '[') {
 426                                                 break;
 427                                         }
 428                                 }
 429                                 warner(
 430                                         packWARN(WARN_ILLEGALPROTO),
 431                                         "Illegal character after '\\' in prototype for %"SVf" : %s",
 432                                         SVfARG(declarator), r
 433                                 );
 434                                 return;
 435
 436                         case '$':
 437                         case '*':
 438                         case '&':
 439                         case ';':
 440                         case '+':
 441                                 break;
 442                 }
 443         }
 444 }
 445
 446 static SV *parse_type(pTHX_ Sentinel, const SV *);
 447
 448 static SV *parse_type_paramd(pTHX_ Sentinel sen, const SV *declarator) {
 449         I32 c;
 450         SV *t;
 451
 452         t = my_scan_word(aTHX_ sen, TRUE);
 453         lex_read_space(0);
 454
 455         c = lex_peek_unichar(0);
 456         if (c == '[') {
 457                 SV *u;
 458
 459                 lex_read_unichar(0);
 460                 lex_read_space(0);
 461                 my_sv_cat_c(aTHX_ t, c);
 462
 463                 u = parse_type(aTHX_ sen, declarator);
 464                 sv_catsv(t, u);
 465
 466                 c = lex_peek_unichar(0);
 467                 if (c != ']') {
 468                         croak("In %"SVf": missing ']' after '%"SVf"'", SVfARG(declarator), SVfARG(t));
 469                 }
 470                 lex_read_unichar(0);
 471                 lex_read_space(0);
 472
 473                 my_sv_cat_c(aTHX_ t, c);
 474         }
 475
 476         return t;
 477 }
 478
 479 static SV *parse_type(pTHX_ Sentinel sen, const SV *declarator) {
 480         I32 c;
 481         SV *t;
 482
 483         t = parse_type_paramd(aTHX_ sen, declarator);
 484
 485         c = lex_peek_unichar(0);
 486         while (c == '|') {
 487                 SV *u;
 488
 489                 lex_read_unichar(0);
 490                 lex_read_space(0);
 491
 492                 my_sv_cat_c(aTHX_ t, c);
 493                 u = parse_type_paramd(aTHX_ sen, declarator);
 494                 sv_catsv(t, u);
 495
 496                 c = lex_peek_unichar(0);
 497         }
 498
 499         return t;
 500 }
 501
 502 static SV *reify_type(pTHX_ Sentinel sen, const SV *declarator, const KWSpec *spec, SV *name) {
 503         AV *type_reifiers;
 504         SV *t, *sv, **psv;
 505         int n;
 506         dSP;
 507
 508         type_reifiers = get_av(MY_PKG "::type_reifiers", 0);
 509         assert(type_reifiers != NULL);
 510
 511         if (spec->reify_type < 0 || spec->reify_type > av_len(type_reifiers)) {
 512                 croak("In %"SVf": internal error: reify_type [%ld] out of range [%ld]", SVfARG(declarator), (long)spec->reify_type, (long)(av_len(type_reifiers) + 1));
 513         }
 514
 515         psv = av_fetch(type_reifiers, spec->reify_type, 0);
 516         assert(psv != NULL);
 517         sv = *psv;
 518
 519         ENTER;
 520         SAVETMPS;
 521
 522         PUSHMARK(SP);
 523         EXTEND(SP, 1);
 524         PUSHs(name);
 525         PUTBACK;
 526
 527         n = call_sv(sv, G_SCALAR);
 528         SPAGAIN;
 529
 530         assert(n == 1);
 531         /* don't warn about n being unused if assert() is compiled out */
 532         n = n;
 533
 534         t = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 535
 536         PUTBACK;
 537         FREETMPS;
 538         LEAVE;
 539
 540         if (!SvTRUE(t)) {
 541                 croak("In %"SVf": undefined type '%"SVf"'", SVfARG(declarator), SVfARG(name));
 542         }
 543
 544         return t;
 545 }
 546
 547
 548 DEFSTRUCT(Param) {
 549         SV *name;
 550         PADOFFSET padoff;
 551         SV *type;
 552 };
 553
 554 DEFSTRUCT(ParamInit) {
 555         Param param;
 556         OpGuard init;
 557 };
 558
 559 #define VEC(B) B ## _Vec
 560
 561 #define DEFVECTOR(B) DEFSTRUCT(VEC(B)) { \
 562         B (*data); \
 563         size_t used, size; \
 564 }
 565
 566 DEFVECTOR(Param);
 567 DEFVECTOR(ParamInit);
 568
 569 #define DEFVECTOR_INIT(N, B) static void N(VEC(B) *p) { \
 570         p->used = 0; \
 571         p->size = 23; \
 572         Newx(p->data, p->size, B); \
 573 } static void N(VEC(B) *)
 574
 575 DEFSTRUCT(ParamSpec) {
 576         Param invocant;
 577         VEC(Param) positional_required;
 578         VEC(ParamInit) positional_optional;
 579         VEC(Param) named_required;
 580         VEC(ParamInit) named_optional;
 581         Param slurpy;
 582         PADOFFSET rest_hash;
 583 };
 584
 585 DEFVECTOR_INIT(pv_init, Param);
 586 DEFVECTOR_INIT(piv_init, ParamInit);
 587
 588 static void p_init(Param *p) {
 589         p->name = NULL;
 590         p->padoff = NOT_IN_PAD;
 591         p->type = NULL;
 592 }
 593
 594 static void ps_init(ParamSpec *ps) {
 595         p_init(&ps->invocant);
 596         pv_init(&ps->positional_required);
 597         piv_init(&ps->positional_optional);
 598         pv_init(&ps->named_required);
 599         piv_init(&ps->named_optional);
 600         p_init(&ps->slurpy);
 601         ps->rest_hash = NOT_IN_PAD;
 602 }
 603
 604 #define DEFVECTOR_EXTEND(N, B) static B (*N(VEC(B) *p)) { \
 605         assert(p->used <= p->size); \
 606         if (p->used == p->size) { \
 607                 const size_t n = p->size / 2 * 3 + 1; \
 608                 Renew(p->data, n, B); \
 609                 p->size = n; \
 610         } \
 611         return &p->data[p->used]; \
 612 } static B (*N(VEC(B) *))
 613
 614 DEFVECTOR_EXTEND(pv_extend, Param);
 615 DEFVECTOR_EXTEND(piv_extend, ParamInit);
 616
 617 #define DEFVECTOR_CLEAR(N, B, F) static void N(pTHX_ VEC(B) *p) { \
 618         while (p->used) { \
 619                 p->used--; \
 620                 F(aTHX_ &p->data[p->used]); \
 621         } \
 622         Safefree(p->data); \
 623         p->data = NULL; \
 624         p->size = 0; \
 625 } static void N(pTHX_ VEC(B) *)
 626
 627 static void p_clear(pTHX_ Param *p) {
 628         p->name = NULL;
 629         p->padoff = NOT_IN_PAD;
 630         p->type = NULL;
 631 }
 632
 633 static void pi_clear(pTHX_ ParamInit *pi) {
 634         p_clear(aTHX_ &pi->param);
 635         op_guard_clear(aTHX_ &pi->init);
 636 }
 637
 638 DEFVECTOR_CLEAR(pv_clear, Param, p_clear);
 639 DEFVECTOR_CLEAR(piv_clear, ParamInit, pi_clear);
 640
 641 static void ps_clear(pTHX_ ParamSpec *ps) {
 642         p_clear(aTHX_ &ps->invocant);
 643
 644         pv_clear(aTHX_ &ps->positional_required);
 645         piv_clear(aTHX_ &ps->positional_optional);
 646
 647         pv_clear(aTHX_ &ps->named_required);
 648         piv_clear(aTHX_ &ps->named_optional);
 649
 650         p_clear(aTHX_ &ps->slurpy);
 651 }
 652
 653 static int ps_contains(pTHX_ const ParamSpec *ps, SV *sv) {
 654         size_t i, lim;
 655
 656         if (ps->invocant.name && sv_eq(sv, ps->invocant.name)) {
 657                 return 1;
 658         }
 659
 660         for (i = 0, lim = ps->positional_required.used; i < lim; i++) {
 661                 if (sv_eq(sv, ps->positional_required.data[i].name)) {
 662                         return 1;
 663                 }
 664         }
 665
 666         for (i = 0, lim = ps->positional_optional.used; i < lim; i++) {
 667                 if (sv_eq(sv, ps->positional_optional.data[i].param.name)) {
 668                         return 1;
 669                 }
 670         }
 671
 672         for (i = 0, lim = ps->named_required.used; i < lim; i++) {
 673                 if (sv_eq(sv, ps->named_required.data[i].name)) {
 674                         return 1;
 675                 }
 676         }
 677
 678         for (i = 0, lim = ps->named_optional.used; i < lim; i++) {
 679                 if (sv_eq(sv, ps->named_optional.data[i].param.name)) {
 680                         return 1;
 681                 }
 682         }
 683
 684         return 0;
 685 }
 686
 687 static void ps_free_void(pTHX_ void *p) {
 688         ps_clear(aTHX_ p);
 689         Safefree(p);
 690 }
 691
 692 static int args_min(pTHX_ const ParamSpec *ps, const KWSpec *ks) {
 693         int n = 0;
 694         if (!ps) {
 695                 return SvTRUE(ks->shift) ? 1 : 0;
 696         }
 697         if (ps->invocant.name) {
 698                 n++;
 699         }
 700         n += ps->positional_required.used;
 701         n += ps->named_required.used * 2;
 702         return n;
 703 }
 704
 705 static int args_max(const ParamSpec *ps) {
 706         int n = 0;
 707         if (!ps) {
 708                 return -1;
 709         }
 710         if (ps->invocant.name) {
 711                 n++;
 712         }
 713         n += ps->positional_required.used;
 714         n += ps->positional_optional.used;
 715         if (ps->named_required.used || ps->named_optional.used || ps->slurpy.name) {
 716                 n = -1;
 717         }
 718         return n;
 719 }
 720
 721 static size_t count_positional_params(const ParamSpec *ps) {
 722         return ps->positional_required.used + ps->positional_optional.used;
 723 }
 724
 725 static size_t count_named_params(const ParamSpec *ps) {
 726         return ps->named_required.used + ps->named_optional.used;
 727 }
 728
 729 static SV *my_eval(pTHX_ Sentinel sen, I32 floor, OP *op) {
 730         SV *sv;
 731         CV *cv;
 732         dSP;
 733
 734         cv = newATTRSUB(floor, NULL, NULL, NULL, op);
 735
 736         ENTER;
 737         SAVETMPS;
 738
 739         PUSHMARK(SP);
 740         call_sv((SV *)cv, G_SCALAR | G_NOARGS);
 741         SPAGAIN;
 742         sv = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 743
 744         PUTBACK;
 745         FREETMPS;
 746         LEAVE;
 747
 748         return sv;
 749 }
 750
 751 enum {
 752         PARAM_INVOCANT = 0x01,
 753         PARAM_NAMED    = 0x02
 754 };
 755
 756 static PADOFFSET parse_param(
 757         pTHX_
 758         Sentinel sen,
 759         const SV *declarator, const KWSpec *spec, ParamSpec *param_spec,
 760         int *pflags, SV **pname, OpGuard *ginit, SV **ptype
 761 ) {
 762         I32 c;
 763         char sigil;
 764         SV *name;
 765
 766         assert(!ginit->op);
 767         *pflags = 0;
 768         *ptype = NULL;
 769
 770         c = lex_peek_unichar(0);
 771
 772         if (spec->flags & FLAG_TYPES_OK) {
 773                 if (c == '(') {
 774                         I32 floor;
 775                         OP *expr;
 776                         Resource *expr_sentinel;
 777
 778                         lex_read_unichar(0);
 779
 780                         floor = start_subparse(FALSE, 0);
 781                         SAVEFREESV(PL_compcv);
 782                         CvSPECIAL_on(PL_compcv);
 783
 784                         if (!(expr = parse_fullexpr(PARSE_OPTIONAL))) {
 785                                 croak("In %"SVf": invalid type expression", SVfARG(declarator));
 786                         }
 787                         if (MY_OP_SLABBED(expr)) {
 788                                 expr_sentinel = NULL;
 789                         } else {
 790                                 expr_sentinel = sentinel_register(sen, expr, free_op_void);
 791                         }
 792
 793                         lex_read_space(0);
 794                         c = lex_peek_unichar(0);
 795                         if (c != ')') {
 796                                 croak("In %"SVf": missing ')' after type expression", SVfARG(declarator));
 797                         }
 798                         lex_read_unichar(0);
 799                         lex_read_space(0);
 800
 801                         SvREFCNT_inc_simple_void(PL_compcv);
 802                         if (expr_sentinel) {
 803                                 sentinel_disarm(expr_sentinel);
 804                         }
 805                         *ptype = my_eval(aTHX_ sen, floor, expr);
 806                         if (!SvROK(*ptype)) {
 807                                 *ptype = reify_type(aTHX_ sen, declarator, spec, *ptype);
 808                         }
 809                         if (!sv_isobject(*ptype)) {
 810                                 croak("In %"SVf": (%"SVf") doesn't look like a type object", SVfARG(declarator), SVfARG(*ptype));
 811                         }
 812
 813                         c = lex_peek_unichar(0);
 814                 } else if (MY_UNI_IDFIRST(c)) {
 815                         *ptype = parse_type(aTHX_ sen, declarator);
 816                         *ptype = reify_type(aTHX_ sen, declarator, spec, *ptype);
 817
 818                         c = lex_peek_unichar(0);
 819                 }
 820         }
 821
 822         if (c == ':') {
 823                 lex_read_unichar(0);
 824                 lex_read_space(0);
 825
 826                 *pflags |= PARAM_NAMED;
 827
 828                 c = lex_peek_unichar(0);
 829         }
 830
 831         if (c == -1) {
 832                 croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 833         }
 834
 835         if (!(c == '$' || c == '@' || c == '%')) {
 836                 croak("In %"SVf": unexpected '%c' in parameter list (expecting a sigil)", SVfARG(declarator), (int)c);
 837         }
 838
 839         sigil = c;
 840
 841         lex_read_unichar(0);
 842         lex_read_space(0);
 843
 844         if (!(name = my_scan_word(aTHX_ sen, FALSE))) {
 845                 croak("In %"SVf": missing identifier after '%c'", SVfARG(declarator), sigil);
 846         }
 847         sv_insert(name, 0, 0, &sigil, 1);
 848         *pname = name;
 849
 850         lex_read_space(0);
 851         c = lex_peek_unichar(0);
 852
 853         if (c == '=') {
 854                 lex_read_unichar(0);
 855                 lex_read_space(0);
 856
 857
 858                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
 859                         param_spec->invocant.name = spec->shift;
 860                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
 861                 }
 862
 863                 op_guard_update(ginit, parse_termexpr(0));
 864
 865                 lex_read_space(0);
 866                 c = lex_peek_unichar(0);
 867         }
 868
 869         if (c == ':') {
 870                 *pflags |= PARAM_INVOCANT;
 871                 lex_read_unichar(0);
 872                 lex_read_space(0);
 873         } else if (c == ',') {
 874                 lex_read_unichar(0);
 875                 lex_read_space(0);
 876         } else if (c != ')') {
 877                 if (c == -1) {
 878                         croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 879                 }
 880                 croak("In %"SVf": unexpected '%c' in parameter list (expecting ',')", SVfARG(declarator), (int)c);
 881         }
 882
 883         return pad_add_name_sv(*pname, IF_HAVE_PERL_5_16(padadd_NO_DUP_CHECK, 0), NULL, NULL);
 884 }
 885
 886 static OP *my_var_g(pTHX_ I32 type, I32 flags, PADOFFSET padoff) {
 887         OP *var = newOP(type, flags);
 888         var->op_targ = padoff;
 889         return var;
 890 }
 891
 892 static OP *my_var(pTHX_ I32 flags, PADOFFSET padoff) {
 893         return my_var_g(aTHX_ OP_PADSV, flags, padoff);
 894 }
 895
 896 static OP *mkhvelem(pTHX_ PADOFFSET h, OP *k) {
 897         OP *hv = my_var_g(aTHX_ OP_PADHV, OPf_REF, h);
 898         return newBINOP(OP_HELEM, 0, hv, k);
 899 }
 900
 901 static OP *mkconstsv(pTHX_ SV *sv) {
 902         return newSVOP(OP_CONST, 0, sv);
 903 }
 904
 905 static OP *mkconstiv(pTHX_ IV i) {
 906         return mkconstsv(aTHX_ newSViv(i));
 907 }
 908
 909 static OP *mkconstpv(pTHX_ const char *p, size_t n) {
 910         return mkconstsv(aTHX_ newSVpv(p, n));
 911 }
 912
 913 #define mkconstpvs(S) mkconstpv(aTHX_ "" S "", sizeof S - 1)
 914
 915 static OP *mktypecheck(pTHX_ const SV *declarator, int nr, SV *name, PADOFFSET padoff, SV *type) {
 916         /* $type->check($value) or Carp::croak "...: " . $type->get_message($value) */
 917         OP *chk, *err, *msg, *xcroak;
 918
 919         err = mkconstsv(aTHX_ newSVpvf("In %"SVf": parameter %d (%"SVf"): ", SVfARG(declarator), nr, SVfARG(name)));
 920         {
 921                 OP *args = NULL;
 922
 923                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 924                 args = op_append_elem(
 925                         OP_LIST, args,
 926                         padoff == NOT_IN_PAD
 927                                 ? S_newDEFSVOP(aTHX)
 928                                 : my_var(aTHX_ 0, padoff)
 929                 );
 930                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("get_message")));
 931
 932                 msg = args;
 933                 msg->op_type = OP_ENTERSUB;
 934                 msg->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 935                 msg->op_flags |= OPf_STACKED;
 936         }
 937
 938         msg = newBINOP(OP_CONCAT, 0, err, msg);
 939
 940         xcroak = newCVREF(
 941                 OPf_WANT_SCALAR,
 942                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
 943         );
 944         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
 945
 946         {
 947                 OP *args = NULL;
 948
 949                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 950                 args = op_append_elem(
 951                         OP_LIST, args,
 952                         padoff == NOT_IN_PAD
 953                                 ? S_newDEFSVOP(aTHX)
 954                                 : my_var(aTHX_ 0, padoff)
 955                 );
 956                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("check")));
 957
 958                 chk = args;
 959                 chk->op_type = OP_ENTERSUB;
 960                 chk->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 961                 chk->op_flags |= OPf_STACKED;
 962         }
 963
 964         chk = newLOGOP(OP_OR, 0, chk, xcroak);
 965         return chk;
 966 }
 967
 968 static OP *mktypecheckp(pTHX_ const SV *declarator, int nr, const Param *param) {
 969         return mktypecheck(aTHX_ declarator, nr, param->name, param->padoff, param->type);
 970 }
 971
 972 static void register_info(pTHX_ UV key, SV *declarator, const KWSpec *kws, const ParamSpec *ps) {
 973         dSP;
 974
 975         ENTER;
 976         SAVETMPS;
 977
 978         PUSHMARK(SP);
 979         EXTEND(SP, 10);
 980
 981         /* 0 */ {
 982                 mPUSHu(key);
 983         }
 984         /* 1 */ {
 985                 STRLEN n;
 986                 char *p = SvPV(declarator, n);
 987                 char *q = memchr(p, ' ', n);
 988                 SV *tmp = newSVpvn_utf8(p, q ? (size_t)(q - p) : n, SvUTF8(declarator));
 989                 mPUSHs(tmp);
 990         }
 991         if (!ps) {
 992                 if (SvTRUE(kws->shift)) {
 993                         PUSHs(kws->shift);
 994                 } else {
 995                         PUSHmortal;
 996                 }
 997                 PUSHmortal;
 998                 mPUSHs(newRV_noinc((SV *)newAV()));
 999                 mPUSHs(newRV_noinc((SV *)newAV()));
1000                 mPUSHs(newRV_noinc((SV *)newAV()));
1001                 mPUSHs(newRV_noinc((SV *)newAV()));
1002                 mPUSHp("@_", 2);
1003                 PUSHmortal;
1004         } else {
1005                 /* 2, 3 */ {
1006                         if (ps->invocant.name) {
1007                                 PUSHs(ps->invocant.name);
1008                                 if (ps->invocant.type) {
1009                                         PUSHs(ps->invocant.type);
1010                                 } else {
1011                                         PUSHmortal;
1012                                 }
1013                         } else {
1014                                 PUSHmortal;
1015                                 PUSHmortal;
1016                         }
1017                 }
1018                 /* 4 */ {
1019                         size_t i, lim;
1020                         AV *av;
1021
1022                         lim = ps->positional_required.used;
1023
1024                         av = newAV();
1025                         if (lim) {
1026                                 av_extend(av, (lim - 1) * 2);
1027                                 for (i = 0; i < lim; i++) {
1028                                         Param *cur = &ps->positional_required.data[i];
1029                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1030                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1031                                 }
1032                         }
1033
1034                         mPUSHs(newRV_noinc((SV *)av));
1035                 }
1036                 /* 5 */ {
1037                         size_t i, lim;
1038                         AV *av;
1039
1040                         lim = ps->positional_optional.used;
1041
1042                         av = newAV();
1043                         if (lim) {
1044                                 av_extend(av, (lim - 1) * 2);
1045                                 for (i = 0; i < lim; i++) {
1046                                         Param *cur = &ps->positional_optional.data[i].param;
1047                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1048                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1049                                 }
1050                         }
1051
1052                         mPUSHs(newRV_noinc((SV *)av));
1053                 }
1054                 /* 6 */ {
1055                         size_t i, lim;
1056                         AV *av;
1057
1058                         lim = ps->named_required.used;
1059
1060                         av = newAV();
1061                         if (lim) {
1062                                 av_extend(av, (lim - 1) * 2);
1063                                 for (i = 0; i < lim; i++) {
1064                                         Param *cur = &ps->named_required.data[i];
1065                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1066                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1067                                 }
1068                         }
1069
1070                         mPUSHs(newRV_noinc((SV *)av));
1071                 }
1072                 /* 7 */ {
1073                         size_t i, lim;
1074                         AV *av;
1075
1076                         lim = ps->named_optional.used;
1077
1078                         av = newAV();
1079                         if (lim) {
1080                                 av_extend(av, (lim - 1) * 2);
1081                                 for (i = 0; i < lim; i++) {
1082                                         Param *cur = &ps->named_optional.data[i].param;
1083                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1084                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1085                                 }
1086                         }
1087
1088                         mPUSHs(newRV_noinc((SV *)av));
1089                 }
1090                 /* 8, 9 */ {
1091                         if (ps->slurpy.name) {
1092                                 PUSHs(ps->slurpy.name);
1093                                 if (ps->slurpy.type) {
1094                                         PUSHs(ps->slurpy.type);
1095                                 } else {
1096                                         PUSHmortal;
1097                                 }
1098                         } else {
1099                                 PUSHmortal;
1100                                 PUSHmortal;
1101                         }
1102                 }
1103         }
1104         PUTBACK;
1105
1106         call_pv(MY_PKG "::_register_info", G_VOID);
1107
1108         FREETMPS;
1109         LEAVE;
1110 }
1111
1112 static int parse_fun(pTHX_ Sentinel sen, OP **pop, const char *keyword_ptr, STRLEN keyword_len, const KWSpec *spec) {
1113         ParamSpec *param_spec;
1114         SV *declarator;
1115         I32 floor_ix;
1116         int save_ix;
1117         SV *saw_name;
1118         OpGuard *prelude_sentinel;
1119         SV *proto;
1120         OpGuard *attrs_sentinel;
1121         OP *body;
1122         unsigned builtin_attrs;
1123         I32 c;
1124
1125         declarator = sentinel_mortalize(sen, newSVpvn(keyword_ptr, keyword_len));
1126         if (lex_bufutf8()) {
1127                 SvUTF8_on(declarator);
1128         }
1129
1130         lex_read_space(0);
1131
1132         builtin_attrs = 0;
1133
1134         /* function name */
1135         saw_name = NULL;
1136         if ((spec->flags & FLAG_NAME_OK) && (saw_name = my_scan_word(aTHX_ sen, TRUE))) {
1137
1138                 if (PL_parser->expect != XSTATE) {
1139                         /* bail out early so we don't predeclare $saw_name */
1140                         croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
1141                 }
1142
1143                 sv_catpvs(declarator, " ");
1144                 sv_catsv(declarator, saw_name);
1145
1146                 if (
1147                         sv_eq_pvs(saw_name, "BEGIN") ||
1148                         sv_eq_pvs(saw_name, "END") ||
1149                         sv_eq_pvs(saw_name, "INIT") ||
1150                         sv_eq_pvs(saw_name, "CHECK") ||
1151                         sv_eq_pvs(saw_name, "UNITCHECK")
1152                 ) {
1153                         builtin_attrs |= MY_ATTR_SPECIAL;
1154                 }
1155
1156                 lex_read_space(0);
1157         } else if (!(spec->flags & FLAG_ANON_OK)) {
1158                 croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - PL_parser->bufptr), PL_parser->bufptr);
1159         } else {
1160                 sv_catpvs(declarator, " (anon)");
1161         }
1162
1163         /* we're a subroutine declaration */
1164         floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
1165         SAVEFREESV(PL_compcv);
1166
1167         /* create outer block: '{' */
1168         save_ix = S_block_start(aTHX_ TRUE);
1169
1170         /* initialize synthetic optree */
1171         Newx(prelude_sentinel, 1, OpGuard);
1172         op_guard_init(prelude_sentinel);
1173         sentinel_register(sen, prelude_sentinel, free_op_guard_void);
1174
1175         /* parameters */
1176         param_spec = NULL;
1177
1178         c = lex_peek_unichar(0);
1179         if (c == '(') {
1180                 OpGuard *init_sentinel;
1181
1182                 Newx(init_sentinel, 1, OpGuard);
1183                 op_guard_init(init_sentinel);
1184                 sentinel_register(sen, init_sentinel, free_op_guard_void);
1185
1186                 Newx(param_spec, 1, ParamSpec);
1187                 ps_init(param_spec);
1188                 sentinel_register(sen, param_spec, ps_free_void);
1189
1190                 lex_read_unichar(0);
1191                 lex_read_space(0);
1192
1193                 while ((c = lex_peek_unichar(0)) != ')') {
1194                         int flags;
1195                         SV *name, *type;
1196                         char sigil;
1197                         PADOFFSET padoff;
1198
1199                         padoff = parse_param(aTHX_ sen, declarator, spec, param_spec, &flags, &name, init_sentinel, &type);
1200
1201                         S_intro_my(aTHX);
1202
1203                         sigil = SvPV_nolen(name)[0];
1204
1205                         /* internal consistency */
1206                         if (flags & PARAM_NAMED) {
1207                                 if (flags & PARAM_INVOCANT) {
1208                                         croak("In %"SVf": invocant %"SVf" can't be a named parameter", SVfARG(declarator), SVfARG(name));
1209                                 }
1210                                 if (sigil != '$') {
1211                                         croak("In %"SVf": named parameter %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1212                                 }
1213                         } else if (flags & PARAM_INVOCANT) {
1214                                 if (init_sentinel->op) {
1215                                         croak("In %"SVf": invocant %"SVf" can't have a default value", SVfARG(declarator), SVfARG(name));
1216                                 }
1217                                 if (sigil != '$') {
1218                                         croak("In %"SVf": invocant %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1219                                 }
1220                         } else if (sigil != '$' && init_sentinel->op) {
1221                                 croak("In %"SVf": %s %"SVf" can't have a default value", SVfARG(declarator), sigil == '@' ? "array" : "hash", SVfARG(name));
1222                         }
1223
1224                         /* external constraints */
1225                         if (param_spec->slurpy.name) {
1226                                 croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(param_spec->slurpy.name), SVfARG(name));
1227                         }
1228                         if (sigil != '$') {
1229                                 assert(!init_sentinel->op);
1230                                 param_spec->slurpy.name = name;
1231                                 param_spec->slurpy.padoff = padoff;
1232                                 param_spec->slurpy.type = type;
1233                                 continue;
1234                         }
1235
1236                         if (!(flags & PARAM_NAMED) && count_named_params(param_spec)) {
1237                                 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));
1238                         }
1239
1240                         if (flags & PARAM_INVOCANT) {
1241                                 if (param_spec->invocant.name) {
1242                                         croak("In %"SVf": invalid double invocants %"SVf", %"SVf"", SVfARG(declarator), SVfARG(param_spec->invocant.name), SVfARG(name));
1243                                 }
1244                                 if (count_positional_params(param_spec) || count_named_params(param_spec)) {
1245                                         croak("In %"SVf": invocant %"SVf" must be first in parameter list", SVfARG(declarator), SVfARG(name));
1246                                 }
1247                                 if (!(spec->flags & FLAG_INVOCANT)) {
1248                                         croak("In %"SVf": invocant %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1249                                 }
1250                                 param_spec->invocant.name = name;
1251                                 param_spec->invocant.padoff = padoff;
1252                                 param_spec->invocant.type = type;
1253                                 continue;
1254                         }
1255
1256                         if (init_sentinel->op && !(spec->flags & FLAG_DEFAULT_ARGS)) {
1257                                 croak("In %"SVf": default argument for %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1258                         }
1259
1260                         if (ps_contains(aTHX_ param_spec, name)) {
1261                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(name));
1262                         }
1263
1264                         if (flags & PARAM_NAMED) {
1265                                 if (!(spec->flags & FLAG_NAMED_PARAMS)) {
1266                                         croak("In %"SVf": named parameter :%"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1267                                 }
1268
1269                                 if (init_sentinel->op) {
1270                                         ParamInit *pi = piv_extend(&param_spec->named_optional);
1271                                         pi->param.name = name;
1272                                         pi->param.padoff = padoff;
1273                                         pi->param.type = type;
1274                                         pi->init = op_guard_transfer(init_sentinel);
1275                                         param_spec->named_optional.used++;
1276                                 } else {
1277                                         Param *p;
1278
1279                                         if (param_spec->positional_optional.used) {
1280                                                 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));
1281                                         }
1282
1283                                         p = pv_extend(&param_spec->named_required);
1284                                         p->name = name;
1285                                         p->padoff = padoff;
1286                                         p->type = type;
1287                                         param_spec->named_required.used++;
1288                                 }
1289                         } else {
1290                                 if (init_sentinel->op || param_spec->positional_optional.used) {
1291                                         ParamInit *pi = piv_extend(&param_spec->positional_optional);
1292                                         pi->param.name = name;
1293                                         pi->param.padoff = padoff;
1294                                         pi->param.type = type;
1295                                         pi->init = op_guard_transfer(init_sentinel);
1296                                         param_spec->positional_optional.used++;
1297                                 } else {
1298                                         Param *p = pv_extend(&param_spec->positional_required);
1299                                         p->name = name;
1300                                         p->padoff = padoff;
1301                                         p->type = type;
1302                                         param_spec->positional_required.used++;
1303                                 }
1304                         }
1305
1306                 }
1307                 lex_read_unichar(0);
1308                 lex_read_space(0);
1309
1310                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
1311                         if (ps_contains(aTHX_ param_spec, spec->shift)) {
1312                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(spec->shift));
1313                         }
1314
1315                         param_spec->invocant.name = spec->shift;
1316                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
1317                 }
1318         }
1319
1320         /* prototype */
1321         proto = NULL;
1322         c = lex_peek_unichar(0);
1323         if (c == ':') {
1324                 lex_read_unichar(0);
1325                 lex_read_space(0);
1326
1327                 c = lex_peek_unichar(0);
1328                 if (c != '(') {
1329                         lex_stuff_pvs(":", 0);
1330                         c = ':';
1331                 } else {
1332                         lex_read_unichar(0);
1333                         if (!(proto = my_scan_parens_tail(aTHX_ sen, FALSE))) {
1334                                 croak("In %"SVf": prototype not terminated", SVfARG(declarator));
1335                         }
1336                         my_check_prototype(aTHX_ sen, declarator, proto);
1337                         lex_read_space(0);
1338                         c = lex_peek_unichar(0);
1339                         if (!(c == ':' || c == '{')) {
1340                                 lex_stuff_pvs(":", 0);
1341                                 c = ':';
1342                         }
1343                 }
1344         }
1345
1346         /* attributes */
1347         Newx(attrs_sentinel, 1, OpGuard);
1348         op_guard_init(attrs_sentinel);
1349         sentinel_register(sen, attrs_sentinel, free_op_guard_void);
1350
1351         if (c == ':' || c == '{') /* '}' - hi, vim */ {
1352
1353                 /* kludge default attributes in */
1354                 if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
1355                         lex_stuff_sv(spec->attrs, 0);
1356                         c = ':';
1357                 }
1358
1359                 if (c == ':') {
1360                         lex_read_unichar(0);
1361                         lex_read_space(0);
1362                         c = lex_peek_unichar(0);
1363
1364                         for (;;) {
1365                                 SV *attr;
1366
1367                                 if (!(attr = my_scan_word(aTHX_ sen, FALSE))) {
1368                                         break;
1369                                 }
1370
1371                                 lex_read_space(0);
1372                                 c = lex_peek_unichar(0);
1373
1374                                 if (c != '(') {
1375                                         if (sv_eq_pvs(attr, "lvalue")) {
1376                                                 builtin_attrs |= MY_ATTR_LVALUE;
1377                                                 attr = NULL;
1378                                         } else if (sv_eq_pvs(attr, "method")) {
1379                                                 builtin_attrs |= MY_ATTR_METHOD;
1380                                                 attr = NULL;
1381                                         }
1382                                 } else {
1383                                         SV *sv;
1384                                         lex_read_unichar(0);
1385                                         if (!(sv = my_scan_parens_tail(aTHX_ sen, TRUE))) {
1386                                                 croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
1387                                         }
1388                                         sv_catpvs(attr, "(");
1389                                         sv_catsv(attr, sv);
1390                                         sv_catpvs(attr, ")");
1391
1392                                         lex_read_space(0);
1393                                         c = lex_peek_unichar(0);
1394                                 }
1395
1396                                 if (attr) {
1397                                         op_guard_update(attrs_sentinel, op_append_elem(OP_LIST, attrs_sentinel->op, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(attr))));
1398                                 }
1399
1400                                 if (c == ':') {
1401                                         lex_read_unichar(0);
1402                                         lex_read_space(0);
1403                                         c = lex_peek_unichar(0);
1404                                 }
1405                         }
1406                 }
1407         }
1408
1409         /* body */
1410         if (c != '{') /* '}' - hi, vim */ {
1411                 croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
1412         }
1413
1414         /* surprise predeclaration! */
1415         if (saw_name) {
1416                 /* 'sub NAME (PROTO);' to make name/proto known to perl before it
1417                    starts parsing the body */
1418                 const I32 sub_ix = start_subparse(FALSE, 0);
1419                 SAVEFREESV(PL_compcv);
1420
1421                 SvREFCNT_inc_simple_void(PL_compcv);
1422
1423                 newATTRSUB(
1424                         sub_ix,
1425                         mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(saw_name)),
1426                         proto ? mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(proto)) : NULL,
1427                         NULL,
1428                         NULL
1429                 );
1430         }
1431
1432         if (builtin_attrs & MY_ATTR_LVALUE) {
1433                 CvLVALUE_on(PL_compcv);
1434         }
1435         if (builtin_attrs & MY_ATTR_METHOD) {
1436                 CvMETHOD_on(PL_compcv);
1437         }
1438         if (builtin_attrs & MY_ATTR_SPECIAL) {
1439                 CvSPECIAL_on(PL_compcv);
1440         }
1441
1442         /* check number of arguments */
1443         if (spec->flags & FLAG_CHECK_NARGS) {
1444                 int amin, amax;
1445
1446                 amin = args_min(aTHX_ param_spec, spec);
1447                 if (amin > 0) {
1448                         OP *chk, *cond, *err, *xcroak;
1449
1450                         err = mkconstsv(aTHX_ newSVpvf("Not enough arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amin));
1451                         err = newBINOP(
1452                                 OP_CONCAT, 0,
1453                                 err,
1454                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1455                         );
1456                         err = newBINOP(
1457                                 OP_CONCAT, 0,
1458                                 err,
1459                                 mkconstpvs(")")
1460                         );
1461
1462                         xcroak = newCVREF(OPf_WANT_SCALAR,
1463                                           newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV)));
1464                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1465                                       op_append_elem(OP_LIST, err, xcroak));
1466
1467                         cond = newBINOP(OP_LT, 0,
1468                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1469                                         mkconstiv(aTHX_ amin));
1470                         chk = newLOGOP(OP_AND, 0, cond, err);
1471
1472                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1473                 }
1474
1475                 amax = args_max(param_spec);
1476                 if (amax >= 0) {
1477                         OP *chk, *cond, *err, *xcroak;
1478
1479                         err = mkconstsv(aTHX_ newSVpvf("Too many arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amax));
1480                         err = newBINOP(
1481                                 OP_CONCAT, 0,
1482                                 err,
1483                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1484                         );
1485                         err = newBINOP(
1486                                 OP_CONCAT, 0,
1487                                 err,
1488                                 mkconstpvs(")")
1489                         );
1490
1491                         xcroak = newCVREF(
1492                                 OPf_WANT_SCALAR,
1493                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1494                         );
1495                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1496                         op_append_elem(OP_LIST, err, xcroak));
1497
1498                         cond = newBINOP(
1499                                 OP_GT, 0,
1500                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1501                                 mkconstiv(aTHX_ amax)
1502                         );
1503                         chk = newLOGOP(OP_AND, 0, cond, err);
1504
1505                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1506                 }
1507
1508                 if (param_spec && (count_named_params(param_spec) || (param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%'))) {
1509                         OP *chk, *cond, *err, *xcroak;
1510                         const UV fixed = count_positional_params(param_spec) + !!param_spec->invocant.name;
1511
1512                         err = mkconstsv(aTHX_ newSVpvf("Odd number of paired arguments for %"SVf"", SVfARG(declarator)));
1513
1514                         xcroak = newCVREF(
1515                                 OPf_WANT_SCALAR,
1516                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1517                         );
1518                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1519                         op_append_elem(OP_LIST, err, xcroak));
1520
1521                         cond = newBINOP(OP_GT, 0,
1522                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1523                                         mkconstiv(aTHX_ fixed));
1524                         cond = newLOGOP(OP_AND, 0,
1525                                         cond,
1526                                         newBINOP(OP_MODULO, 0,
1527                                                  fixed
1528                                                  ? newBINOP(OP_SUBTRACT, 0,
1529                                                             newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1530                                                             mkconstiv(aTHX_ fixed))
1531                                                  : newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1532                                                  mkconstiv(aTHX_ 2)));
1533                         chk = newLOGOP(OP_AND, 0, cond, err);
1534
1535                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1536                 }
1537         }
1538
1539         if (!param_spec) {
1540                 /* my $invocant = shift; */
1541                 if (SvTRUE(spec->shift)) {
1542                         OP *var;
1543
1544                         var = my_var(
1545                                 aTHX_
1546                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1547                                 pad_add_name_sv(spec->shift, 0, NULL, NULL)
1548                         );
1549                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1550
1551                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1552                 }
1553         } else {
1554                 /* my $invocant = shift; */
1555                 if (param_spec->invocant.name) {
1556                         OP *var;
1557
1558                         var = my_var(
1559                                 aTHX_
1560                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1561                                 param_spec->invocant.padoff
1562                         );
1563                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1564
1565                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1566
1567                         if (param_spec->invocant.type && (spec->flags & FLAG_CHECK_TARGS)) {
1568                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, 0, &param_spec->invocant))));
1569                         }
1570                 }
1571
1572                 /* my (...) = @_; */
1573                 {
1574                         OP *lhs;
1575                         size_t i, lim;
1576
1577                         lhs = NULL;
1578
1579                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1580                                 OP *const var = my_var(
1581                                         aTHX_
1582                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1583                                         param_spec->positional_required.data[i].padoff
1584                                 );
1585                                 lhs = op_append_elem(OP_LIST, lhs, var);
1586                         }
1587
1588                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1589                                 OP *const var = my_var(
1590                                         aTHX_
1591                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1592                                         param_spec->positional_optional.data[i].param.padoff
1593                                 );
1594                                 lhs = op_append_elem(OP_LIST, lhs, var);
1595                         }
1596
1597                         {
1598                                 PADOFFSET padoff;
1599                                 I32 type;
1600                                 bool slurpy_hash;
1601
1602                                 /*
1603                                  * cases:
1604                                  *  1) no named params
1605                                  *   1.1) slurpy
1606                                  *       => put it in
1607                                  *   1.2) no slurpy
1608                                  *       => nop
1609                                  *  2) named params
1610                                  *   2.1) no slurpy
1611                                  *       => synthetic %{rest}
1612                                  *   2.2) slurpy is a hash
1613                                  *       => put it in
1614                                  *   2.3) slurpy is an array
1615                                  *       => synthetic %{rest}
1616                                  *          remember to declare array later
1617                                  */
1618
1619                                 slurpy_hash = param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%';
1620                                 if (!count_named_params(param_spec)) {
1621                                         if (param_spec->slurpy.name) {
1622                                                 padoff = param_spec->slurpy.padoff;
1623                                                 type = slurpy_hash ? OP_PADHV : OP_PADAV;
1624                                         } else {
1625                                                 padoff = NOT_IN_PAD;
1626                                                 type = OP_PADSV;
1627                                         }
1628                                 } else if (slurpy_hash) {
1629                                         padoff = param_spec->slurpy.padoff;
1630                                         type = OP_PADHV;
1631                                 } else {
1632                                         padoff = param_spec->rest_hash = pad_add_name_pvs("%{rest}", 0, NULL, NULL);
1633                                         type = OP_PADHV;
1634                                 }
1635
1636                                 if (padoff != NOT_IN_PAD) {
1637                                         OP *const var = my_var_g(
1638                                                 aTHX_
1639                                                 type,
1640                                                 OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1641                                                 padoff
1642                                         );
1643
1644                                         lhs = op_append_elem(OP_LIST, lhs, var);
1645
1646                                         if (type == OP_PADHV) {
1647                                                 param_spec->rest_hash = padoff;
1648                                         }
1649                                 }
1650                         }
1651
1652                         if (lhs) {
1653                                 OP *rhs;
1654                                 lhs->op_flags |= OPf_PARENS;
1655                                 rhs = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
1656
1657                                 op_guard_update(prelude_sentinel, op_append_list(
1658                                         OP_LINESEQ, prelude_sentinel->op,
1659                                         newSTATEOP(
1660                                                 0, NULL,
1661                                                 newASSIGNOP(OPf_STACKED, lhs, 0, rhs)
1662                                         )
1663                                 ));
1664                         }
1665                 }
1666
1667                 /* default positional arguments */
1668                 {
1669                         size_t i, lim, req;
1670                         OP *nest;
1671
1672                         nest = NULL;
1673
1674                         req = param_spec->positional_required.used;
1675                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1676                                 ParamInit *cur = &param_spec->positional_optional.data[i];
1677                                 OP *var, *cond;
1678
1679                                 cond = newBINOP(
1680                                         OP_LT, 0,
1681                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1682                                         mkconstiv(aTHX_ req + i + 1)
1683                                 );
1684
1685                                 var = my_var(aTHX_ 0, cur->param.padoff);
1686
1687                                 nest = op_append_list(
1688                                         OP_LINESEQ, nest,
1689                                         newASSIGNOP(OPf_STACKED, var, 0, op_guard_relinquish(&cur->init))
1690                                 );
1691                                 nest = newCONDOP(
1692                                         0,
1693                                         cond,
1694                                         nest,
1695                                         NULL
1696                                 );
1697                         }
1698
1699                         op_guard_update(prelude_sentinel, op_append_list(
1700                                 OP_LINESEQ, prelude_sentinel->op,
1701                                 nest
1702                         ));
1703                 }
1704
1705                 /* named parameters */
1706                 if (count_named_params(param_spec)) {
1707                         size_t i, lim;
1708
1709                         assert(param_spec->rest_hash != NOT_IN_PAD);
1710
1711                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1712                                 Param *cur = &param_spec->named_required.data[i];
1713                                 size_t n;
1714                                 char *p = SvPV(cur->name, n);
1715                                 OP *var, *cond;
1716
1717                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1718
1719                                 if (spec->flags & FLAG_CHECK_NARGS) {
1720                                         OP *xcroak, *msg;
1721
1722                                         var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1723                                         var = newUNOP(OP_DELETE, 0, var);
1724
1725                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": missing named parameter: %.*s", SVfARG(declarator), (int)(n - 1), p + 1));
1726                                         xcroak = newCVREF(
1727                                                 OPf_WANT_SCALAR,
1728                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1729                                         );
1730                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1731
1732                                         cond = newUNOP(OP_EXISTS, 0, cond);
1733
1734                                         cond = newCONDOP(0, cond, var, xcroak);
1735                                 }
1736
1737                                 var = my_var(
1738                                         aTHX_
1739                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1740                                         cur->padoff
1741                                 );
1742                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1743
1744                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1745                         }
1746
1747                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1748                                 ParamInit *cur = &param_spec->named_optional.data[i];
1749                                 size_t n;
1750                                 char *p = SvPV(cur->param.name, n);
1751                                 OP *var, *cond;
1752
1753                                 var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1754                                 var = newUNOP(OP_DELETE, 0, var);
1755
1756                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1757                                 cond = newUNOP(OP_EXISTS, 0, cond);
1758
1759                                 cond = newCONDOP(0, cond, var, op_guard_relinquish(&cur->init));
1760
1761                                 var = my_var(
1762                                         aTHX_
1763                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1764                                         cur->param.padoff
1765                                 );
1766                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1767
1768                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1769                         }
1770
1771                         if (!param_spec->slurpy.name) {
1772                                 if (spec->flags & FLAG_CHECK_NARGS) {
1773                                         /* croak if %{rest} */
1774                                         OP *xcroak, *cond, *keys, *msg;
1775
1776                                         keys = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1777                                         keys = newLISTOP(OP_SORT, 0, newOP(OP_PUSHMARK, 0), keys);
1778                                         {
1779                                                 OP *first, *mid, *last;
1780
1781                                                 last = keys;
1782
1783                                                 mid = mkconstpvs(", ");
1784                                                 mid->op_sibling = last;
1785
1786                                                 first = newOP(OP_PUSHMARK, 0);
1787
1788                                                 keys = newLISTOP(OP_JOIN, 0, first, mid);
1789                                                 keys->op_targ = pad_alloc(OP_JOIN, SVs_PADTMP);
1790                                                 ((LISTOP *)keys)->op_last = last;
1791                                         }
1792
1793                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": no such named parameter: ", SVfARG(declarator)));
1794                                         msg = newBINOP(OP_CONCAT, 0, msg, keys);
1795
1796                                         xcroak = newCVREF(
1797                                                 OPf_WANT_SCALAR,
1798                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1799                                         );
1800                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1801
1802                                         cond = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1803                                         xcroak = newCONDOP(0, cond, xcroak, NULL);
1804
1805                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, xcroak)));
1806                                 } else {
1807                                         OP *clear;
1808
1809                                         clear = newASSIGNOP(
1810                                                 OPf_STACKED,
1811                                                 my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1812                                                 0,
1813                                                 newNULLLIST()
1814                                         );
1815
1816                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, clear)));
1817                                 }
1818                         } else if (param_spec->slurpy.padoff != param_spec->rest_hash) {
1819                                 OP *var, *clear;
1820
1821                                 assert(SvPV_nolen(param_spec->slurpy.name)[0] == '@');
1822
1823                                 var = my_var_g(
1824                                         aTHX_
1825                                         OP_PADAV,
1826                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1827                                         param_spec->slurpy.padoff
1828                                 );
1829
1830                                 var = newASSIGNOP(OPf_STACKED, var, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1831
1832                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1833
1834                                 clear = newASSIGNOP(
1835                                         OPf_STACKED,
1836                                         my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1837                                         0,
1838                                         newNULLLIST()
1839                                 );
1840
1841                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, clear)));
1842                         }
1843                 }
1844
1845                 if (spec->flags & FLAG_CHECK_TARGS) {
1846                         size_t i, lim, base;
1847
1848                         base = 1;
1849                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1850                                 Param *cur = &param_spec->positional_required.data[i];
1851
1852                                 if (cur->type) {
1853                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1854                                 }
1855                         }
1856                         base += i;
1857
1858                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1859                                 Param *cur = &param_spec->positional_optional.data[i].param;
1860
1861                                 if (cur->type) {
1862                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1863                                 }
1864                         }
1865                         base += i;
1866
1867                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1868                                 Param *cur = &param_spec->named_required.data[i];
1869
1870                                 if (cur->type) {
1871                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1872                                 }
1873                         }
1874                         base += i;
1875
1876                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1877                                 Param *cur = &param_spec->named_optional.data[i].param;
1878
1879                                 if (cur->type) {
1880                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1881                                 }
1882                         }
1883                         base += i;
1884
1885                         if (param_spec->slurpy.type) {
1886                                 /* $type->valid($_) or croak $type->get_message($_) for @rest / values %rest */
1887                                 OP *check, *list, *loop;
1888
1889                                 check = mktypecheck(aTHX_ declarator, base, param_spec->slurpy.name, NOT_IN_PAD, param_spec->slurpy.type);
1890
1891                                 if (SvPV_nolen(param_spec->slurpy.name)[0] == '@') {
1892                                         list = my_var_g(aTHX_ OP_PADAV, 0, param_spec->slurpy.padoff);
1893                                 } else {
1894                                         list = my_var_g(aTHX_ OP_PADHV, 0, param_spec->slurpy.padoff);
1895                                         list = newUNOP(OP_VALUES, 0, list);
1896                                 }
1897
1898                                 loop = newFOROP(0, NULL, list, check, NULL);
1899
1900                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, loop)));
1901                         }
1902                 }
1903         }
1904
1905         /* finally let perl parse the actual subroutine body */
1906         body = parse_block(0);
1907
1908         /* add '();' to make function return nothing by default */
1909         /* (otherwise the invisible parameter initialization can "leak" into
1910            the return value: fun ($x) {}->("asdf", 0) == 2) */
1911         if (prelude_sentinel->op) {
1912                 body = newSTATEOP(0, NULL, body);
1913         }
1914
1915         body = op_append_list(OP_LINESEQ, op_guard_relinquish(prelude_sentinel), body);
1916
1917         /* it's go time. */
1918         {
1919                 CV *cv;
1920                 OP *const attrs = op_guard_relinquish(attrs_sentinel);
1921
1922                 SvREFCNT_inc_simple_void(PL_compcv);
1923
1924                 /* close outer block: '}' */
1925                 S_block_end(aTHX_ save_ix, body);
1926
1927                 cv = newATTRSUB(
1928                         floor_ix,
1929                         saw_name ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)) : NULL,
1930                         proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
1931                         attrs,
1932                         body
1933                 );
1934
1935                 if (cv) {
1936                         register_info(aTHX_ PTR2UV(CvROOT(cv)), declarator, spec, param_spec);
1937                 }
1938
1939                 if (saw_name) {
1940                         *pop = newOP(OP_NULL, 0);
1941                         return KEYWORD_PLUGIN_STMT;
1942                 }
1943
1944                 *pop = newUNOP(
1945                         OP_REFGEN, 0,
1946                         newSVOP(
1947                                 OP_ANONCODE, 0,
1948                                 (SV *)cv
1949                         )
1950                 );
1951                 return KEYWORD_PLUGIN_EXPR;
1952         }
1953 }
1954
1955 static int kw_flags_enter(pTHX_ Sentinel sen, const char *kw_ptr, STRLEN kw_len, KWSpec *spec) {
1956         HV *hints;
1957         SV *sv, **psv;
1958         const char *p, *kw_active;
1959         STRLEN kw_active_len;
1960         bool kw_is_utf8;
1961
1962         if (!(hints = GvHV(PL_hintgv))) {
1963                 return FALSE;
1964         }
1965         if (!(psv = hv_fetchs(hints, HINTK_KEYWORDS, 0))) {
1966                 return FALSE;
1967         }
1968         sv = *psv;
1969         kw_active = SvPV(sv, kw_active_len);
1970         if (kw_active_len <= kw_len) {
1971                 return FALSE;
1972         }
1973
1974         kw_is_utf8 = lex_bufutf8();
1975
1976         for (
1977                 p = kw_active;
1978                 (p = strchr(p, *kw_ptr)) &&
1979                 p < kw_active + kw_active_len - kw_len;
1980                 p++
1981         ) {
1982                 if (
1983                         (p == kw_active || p[-1] == ' ') &&
1984                         p[kw_len] == ' ' &&
1985                         memcmp(kw_ptr, p, kw_len) == 0
1986                 ) {
1987                         ENTER;
1988                         SAVETMPS;
1989
1990                         SAVEDESTRUCTOR_X(sentinel_clear_void, sen);
1991
1992                         spec->flags = 0;
1993                         spec->reify_type = 0;
1994                         spec->shift = sentinel_mortalize(sen, newSVpvs(""));
1995                         spec->attrs = sentinel_mortalize(sen, newSVpvs(""));
1996
1997 #define FETCH_HINTK_INTO(NAME, PTR, LEN, X) STMT_START { \
1998         const char *fk_ptr_; \
1999         STRLEN fk_len_; \
2000         I32 fk_xlen_; \
2001         SV *fk_sv_; \
2002         fk_sv_ = sentinel_mortalize(sen, newSVpvs(HINTK_ ## NAME)); \
2003         sv_catpvn(fk_sv_, PTR, LEN); \
2004         fk_ptr_ = SvPV(fk_sv_, fk_len_); \
2005         fk_xlen_ = fk_len_; \
2006         if (kw_is_utf8) { \
2007                 fk_xlen_ = -fk_xlen_; \
2008         } \
2009         if (!((X) = hv_fetch(hints, fk_ptr_, fk_xlen_, 0))) { \
2010                 croak("%s: internal error: $^H{'%.*s'} not set", MY_PKG, (int)fk_len_, fk_ptr_); \
2011         } \
2012 } STMT_END
2013
2014                         FETCH_HINTK_INTO(FLAGS_, kw_ptr, kw_len, psv);
2015                         spec->flags = SvIV(*psv);
2016
2017                         FETCH_HINTK_INTO(REIFY_, kw_ptr, kw_len, psv);
2018                         spec->reify_type = SvIV(*psv);
2019
2020                         FETCH_HINTK_INTO(SHIFT_, kw_ptr, kw_len, psv);
2021                         SvSetSV(spec->shift, *psv);
2022
2023                         FETCH_HINTK_INTO(ATTRS_, kw_ptr, kw_len, psv);
2024                         SvSetSV(spec->attrs, *psv);
2025
2026 #undef FETCH_HINTK_INTO
2027                         return TRUE;
2028                 }
2029         }
2030         return FALSE;
2031 }
2032
2033 static int my_keyword_plugin(pTHX_ char *keyword_ptr, STRLEN keyword_len, OP **op_ptr) {
2034         Sentinel sen = { NULL };
2035         KWSpec spec;
2036         int ret;
2037
2038         if (kw_flags_enter(aTHX_ sen, keyword_ptr, keyword_len, &spec)) {
2039                 /* scope was entered, 'sen' and 'spec' are initialized */
2040                 ret = parse_fun(aTHX_ sen, op_ptr, keyword_ptr, keyword_len, &spec);
2041                 FREETMPS;
2042                 LEAVE;
2043         } else {
2044                 /* not one of our keywords, no allocation done */
2045                 ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
2046         }
2047
2048         return ret;
2049 }
2050
2051 WARNINGS_RESET
2052
2053 MODULE = Function::Parameters   PACKAGE = Function::Parameters   PREFIX = fp_
2054 PROTOTYPES: ENABLE
2055
2056 UV
2057 fp__cv_root(sv)
2058         SV * sv
2059         PREINIT:
2060                 CV *xcv;
2061                 HV *hv;
2062                 GV *gv;
2063         CODE:
2064                 xcv = sv_2cv(sv, &hv, &gv, 0);
2065                 RETVAL = PTR2UV(xcv ? CvROOT(xcv) : NULL);
2066         OUTPUT:
2067                 RETVAL
2068
2069 BOOT:
2070 WARNINGS_ENABLE {
2071         HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
2072         /**/
2073         newCONSTSUB(stash, "FLAG_NAME_OK",      newSViv(FLAG_NAME_OK));
2074         newCONSTSUB(stash, "FLAG_ANON_OK",      newSViv(FLAG_ANON_OK));
2075         newCONSTSUB(stash, "FLAG_DEFAULT_ARGS", newSViv(FLAG_DEFAULT_ARGS));
2076         newCONSTSUB(stash, "FLAG_CHECK_NARGS",  newSViv(FLAG_CHECK_NARGS));
2077         newCONSTSUB(stash, "FLAG_INVOCANT",     newSViv(FLAG_INVOCANT));
2078         newCONSTSUB(stash, "FLAG_NAMED_PARAMS", newSViv(FLAG_NAMED_PARAMS));
2079         newCONSTSUB(stash, "FLAG_TYPES_OK",     newSViv(FLAG_TYPES_OK));
2080         newCONSTSUB(stash, "FLAG_CHECK_TARGS",  newSViv(FLAG_CHECK_TARGS));
2081         newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
2082         newCONSTSUB(stash, "HINTK_FLAGS_",   newSVpvs(HINTK_FLAGS_));
2083         newCONSTSUB(stash, "HINTK_SHIFT_",   newSVpvs(HINTK_SHIFT_));
2084         newCONSTSUB(stash, "HINTK_ATTRS_",   newSVpvs(HINTK_ATTRS_));
2085         newCONSTSUB(stash, "HINTK_REIFY_",   newSVpvs(HINTK_REIFY_));
2086         /**/
2087         next_keyword_plugin = PL_keyword_plugin;
2088         PL_keyword_plugin = my_keyword_plugin;
2089 } WARNINGS_RESET