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