Parameters.xs

   1 /*
   2 Copyright 2012 Lukas Mai.
   3
   4 This program is free software; you can redistribute it and/or modify it
   5 under the terms of either: the GNU General Public License as published
   6 by the Free Software Foundation; or the Artistic License.
   7
   8 See http://dev.perl.org/licenses/ for more information.
   9  */
  10
  11 #ifdef __GNUC__
  12  #if (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) || __GNUC__ >= 5
  13   #define PRAGMA_GCC_(X) _Pragma(#X)
  14   #define PRAGMA_GCC(X) PRAGMA_GCC_(GCC X)
  15  #endif
  16 #endif
  17
  18 #ifndef PRAGMA_GCC
  19  #define PRAGMA_GCC(X)
  20 #endif
  21
  22 #ifdef DEVEL
  23  #define WARNINGS_RESET PRAGMA_GCC(diagnostic pop)
  24  #define WARNINGS_ENABLEW(X) PRAGMA_GCC(diagnostic warning #X)
  25  #define WARNINGS_ENABLE \
  26         WARNINGS_ENABLEW(-Wall) \
  27         WARNINGS_ENABLEW(-Wextra) \
  28         WARNINGS_ENABLEW(-Wundef) \
  29         /* WARNINGS_ENABLEW(-Wshadow) :-( */ \
  30         WARNINGS_ENABLEW(-Wbad-function-cast) \
  31         WARNINGS_ENABLEW(-Wcast-align) \
  32         WARNINGS_ENABLEW(-Wwrite-strings) \
  33         /* WARNINGS_ENABLEW(-Wnested-externs) wtf? */ \
  34         WARNINGS_ENABLEW(-Wstrict-prototypes) \
  35         WARNINGS_ENABLEW(-Wmissing-prototypes) \
  36         WARNINGS_ENABLEW(-Winline) \
  37         WARNINGS_ENABLEW(-Wdisabled-optimization)
  38
  39 #else
  40  #define WARNINGS_RESET
  41  #define WARNINGS_ENABLE
  42 #endif
  43
  44
  45 #define PERL_NO_GET_CONTEXT
  46 #include "EXTERN.h"
  47 #include "perl.h"
  48 #include "XSUB.h"
  49
  50 #include <string.h>
  51
  52
  53 WARNINGS_ENABLE
  54
  55
  56 #define HAVE_PERL_VERSION(R, V, S) \
  57         (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
  58
  59 #if HAVE_PERL_VERSION(5, 16, 0)
  60  #define IF_HAVE_PERL_5_16(YES, NO) YES
  61 #else
  62  #define IF_HAVE_PERL_5_16(YES, NO) NO
  63 #endif
  64
  65 #if 0
  66  #if HAVE_PERL_VERSION(5, 17, 6)
  67   #error "internal error: missing definition of KEY_my (your perl is too new)"
  68  #elif HAVE_PERL_VERSION(5, 15, 8)
  69   #define S_KEY_my 134
  70  #elif HAVE_PERL_VERSION(5, 15, 6)
  71   #define S_KEY_my 133
  72  #elif HAVE_PERL_VERSION(5, 15, 5)
  73   #define S_KEY_my 132
  74  #elif HAVE_PERL_VERSION(5, 13, 0)
  75   #define S_KEY_my 131
  76  #else
  77   #error "internal error: missing definition of KEY_my (your perl is too old)"
  78  #endif
  79 #endif
  80
  81
  82 #define MY_PKG "Function::Parameters"
  83
  84 #define HINTK_KEYWORDS MY_PKG "/keywords"
  85 #define HINTK_FLAGS_   MY_PKG "/flags:"
  86 #define HINTK_SHIFT_   MY_PKG "/shift:"
  87 #define HINTK_ATTRS_   MY_PKG "/attrs:"
  88
  89 #define DEFSTRUCT(T) typedef struct T T; struct T
  90
  91 #define UV_BITS (sizeof (UV) * CHAR_BIT)
  92
  93 enum {
  94         FLAG_NAME_OK      = 0x01,
  95         FLAG_ANON_OK      = 0x02,
  96         FLAG_DEFAULT_ARGS = 0x04,
  97         FLAG_CHECK_NARGS  = 0x08,
  98         FLAG_INVOCANT     = 0x10,
  99         FLAG_NAMED_PARAMS = 0x20,
 100         FLAG_TYPES_OK     = 0x40,
 101         FLAG_CHECK_TARGS  = 0x80
 102 };
 103
 104 DEFSTRUCT(KWSpec) {
 105         unsigned flags;
 106         SV *shift;
 107         SV *attrs;
 108 };
 109
 110 static int (*next_keyword_plugin)(pTHX_ char *, STRLEN, OP **);
 111
 112 DEFSTRUCT(Resource) {
 113         Resource *next;
 114         void *data;
 115         void (*destroy)(pTHX_ void *);
 116 };
 117
 118 typedef Resource *Sentinel[1];
 119
 120 static void sentinel_clear_void(pTHX_ void *p) {
 121         Resource **pp = p;
 122         while (*pp) {
 123                 Resource *cur = *pp;
 124                 if (cur->destroy) {
 125                         cur->destroy(aTHX_ cur->data);
 126                 }
 127                 cur->data = (void *)"no";
 128                 cur->destroy = NULL;
 129                 *pp = cur->next;
 130                 Safefree(cur);
 131         }
 132 }
 133
 134 static Resource *sentinel_register(Sentinel sen, void *data, void (*destroy)(pTHX_ void *)) {
 135         Resource *cur;
 136
 137         Newx(cur, 1, Resource);
 138         cur->data = data;
 139         cur->destroy = destroy;
 140         cur->next = *sen;
 141         *sen = cur;
 142
 143         return cur;
 144 }
 145
 146 static void sentinel_disarm(Resource *p) {
 147         p->destroy = NULL;
 148 }
 149
 150 static void my_sv_refcnt_dec_void(pTHX_ void *p) {
 151         SV *sv = p;
 152         SvREFCNT_dec(sv);
 153 }
 154
 155 static SV *sentinel_mortalize(Sentinel sen, SV *sv) {
 156         sentinel_register(sen, sv, my_sv_refcnt_dec_void);
 157         return sv;
 158 }
 159
 160
 161 #if HAVE_PERL_VERSION(5, 17, 2)
 162  #define MY_OP_SLABBED(O) ((O)->op_slabbed)
 163 #else
 164  #define MY_OP_SLABBED(O) 0
 165 #endif
 166
 167 DEFSTRUCT(OpGuard) {
 168         OP *op;
 169         bool needs_freed;
 170 };
 171
 172 static void op_guard_init(OpGuard *p) {
 173         p->op = NULL;
 174         p->needs_freed = FALSE;
 175 }
 176
 177 static OpGuard op_guard_transfer(OpGuard *p) {
 178         OpGuard r = *p;
 179         op_guard_init(p);
 180         return r;
 181 }
 182
 183 static OP *op_guard_relinquish(OpGuard *p) {
 184         OP *o = p->op;
 185         op_guard_init(p);
 186         return o;
 187 }
 188
 189 static void op_guard_update(OpGuard *p, OP *o) {
 190         p->op = o;
 191         p->needs_freed = o && !MY_OP_SLABBED(o);
 192 }
 193
 194 static void op_guard_clear(pTHX_ OpGuard *p) {
 195         if (p->needs_freed) {
 196                 op_free(p->op);
 197         }
 198 }
 199
 200 static void free_op_guard_void(pTHX_ void *vp) {
 201         OpGuard *p = vp;
 202         op_guard_clear(aTHX_ p);
 203         Safefree(p);
 204 }
 205
 206 static void free_op_void(pTHX_ void *vp) {
 207         OP *p = vp;
 208         op_free(p);
 209 }
 210
 211 #define sv_eq_pvs(SV, S) my_sv_eq_pvn(aTHX_ SV, "" S "", sizeof (S) - 1)
 212
 213 static int my_sv_eq_pvn(pTHX_ SV *sv, const char *p, STRLEN n) {
 214         STRLEN sv_len;
 215         const char *sv_p = SvPV(sv, sv_len);
 216         return memcmp(sv_p, p, n) == 0;
 217 }
 218
 219
 220 #include "padop_on_crack.c.inc"
 221
 222
 223 static void my_require(pTHX_ const char *file) {
 224         SV *err;
 225         require_pv(file);
 226         err = ERRSV;
 227         if (SvTRUE(err)) {
 228                 croak_sv(err);
 229         }
 230 }
 231
 232 enum {
 233         MY_ATTR_LVALUE = 0x01,
 234         MY_ATTR_METHOD = 0x02,
 235         MY_ATTR_SPECIAL = 0x04
 236 };
 237
 238 static void my_sv_cat_c(pTHX_ SV *sv, U32 c) {
 239         char ds[UTF8_MAXBYTES + 1], *d;
 240         d = (char *)uvchr_to_utf8((U8 *)ds, c);
 241         if (d - ds > 1) {
 242                 sv_utf8_upgrade(sv);
 243         }
 244         sv_catpvn(sv, ds, d - ds);
 245 }
 246
 247
 248 #define MY_UNI_IDFIRST(C) isIDFIRST_uni(C)
 249 #define MY_UNI_IDCONT(C)  isALNUM_uni(C)
 250
 251 static SV *my_scan_word(pTHX_ Sentinel sen, bool allow_package) {
 252         bool at_start, at_substart;
 253         I32 c;
 254         SV *sv = sentinel_mortalize(sen, newSVpvs(""));
 255         if (lex_bufutf8()) {
 256                 SvUTF8_on(sv);
 257         }
 258
 259         at_start = at_substart = TRUE;
 260         c = lex_peek_unichar(0);
 261
 262         while (c != -1) {
 263                 if (at_substart ? MY_UNI_IDFIRST(c) : MY_UNI_IDCONT(c)) {
 264                         lex_read_unichar(0);
 265                         my_sv_cat_c(aTHX_ sv, c);
 266                         at_substart = FALSE;
 267                         c = lex_peek_unichar(0);
 268                 } else if (allow_package && !at_substart && c == '\'') {
 269                         lex_read_unichar(0);
 270                         c = lex_peek_unichar(0);
 271                         if (!MY_UNI_IDFIRST(c)) {
 272                                 lex_stuff_pvs("'", 0);
 273                                 break;
 274                         }
 275                         sv_catpvs(sv, "'");
 276                         at_substart = TRUE;
 277                 } else if (allow_package && (at_start || !at_substart) && c == ':') {
 278                         lex_read_unichar(0);
 279                         if (lex_peek_unichar(0) != ':') {
 280                                 lex_stuff_pvs(":", 0);
 281                                 break;
 282                         }
 283                         lex_read_unichar(0);
 284                         c = lex_peek_unichar(0);
 285                         if (!MY_UNI_IDFIRST(c)) {
 286                                 lex_stuff_pvs("::", 0);
 287                                 break;
 288                         }
 289                         sv_catpvs(sv, "::");
 290                         at_substart = TRUE;
 291                 } else {
 292                         break;
 293                 }
 294                 at_start = FALSE;
 295         }
 296
 297         return SvCUR(sv) ? sv : NULL;
 298 }
 299
 300 static SV *my_scan_parens_tail(pTHX_ Sentinel sen, bool keep_backslash) {
 301         I32 c, nesting;
 302         SV *sv;
 303         line_t start;
 304
 305         start = CopLINE(PL_curcop);
 306
 307         sv = sentinel_mortalize(sen, newSVpvs(""));
 308         if (lex_bufutf8()) {
 309                 SvUTF8_on(sv);
 310         }
 311
 312         nesting = 0;
 313         for (;;) {
 314                 c = lex_read_unichar(0);
 315                 if (c == EOF) {
 316                         CopLINE_set(PL_curcop, start);
 317                         return NULL;
 318                 }
 319
 320                 if (c == '\\') {
 321                         c = lex_read_unichar(0);
 322                         if (c == EOF) {
 323                                 CopLINE_set(PL_curcop, start);
 324                                 return NULL;
 325                         }
 326                         if (keep_backslash || (c != '(' && c != ')')) {
 327                                 sv_catpvs(sv, "\\");
 328                         }
 329                 } else if (c == '(') {
 330                         nesting++;
 331                 } else if (c == ')') {
 332                         if (!nesting) {
 333                                 break;
 334                         }
 335                         nesting--;
 336                 }
 337
 338                 my_sv_cat_c(aTHX_ sv, c);
 339         }
 340
 341         return sv;
 342 }
 343
 344 static void my_check_prototype(pTHX_ Sentinel sen, const SV *declarator, SV *proto) {
 345         char *start, *r, *w, *end;
 346         STRLEN len;
 347
 348         /* strip spaces */
 349         start = SvPV(proto, len);
 350         end = start + len;
 351
 352         for (w = r = start; r < end; r++) {
 353                 if (!isSPACE(*r)) {
 354                         *w++ = *r;
 355                 }
 356         }
 357         *w = '\0';
 358         SvCUR_set(proto, w - start);
 359         end = w;
 360         len = end - start;
 361
 362         if (!ckWARN(WARN_ILLEGALPROTO)) {
 363                 return;
 364         }
 365
 366         /* check for bad characters */
 367         if (strspn(start, "$@%*;[]&\\_+") != len) {
 368                 SV *dsv = sentinel_mortalize(sen, newSVpvs(""));
 369                 warner(
 370                         packWARN(WARN_ILLEGALPROTO),
 371                         "Illegal character in prototype for %"SVf" : %s",
 372                         SVfARG(declarator),
 373                         SvUTF8(proto)
 374                                 ? sv_uni_display(
 375                                         dsv,
 376                                         proto,
 377                                         len,
 378                                         UNI_DISPLAY_ISPRINT
 379                                 )
 380                                 : pv_pretty(dsv, start, len, 60, NULL, NULL,
 381                                         PERL_PV_ESCAPE_NONASCII
 382                                 )
 383                 );
 384                 return;
 385         }
 386
 387         for (r = start; r < end; r++) {
 388                 switch (*r) {
 389                         default:
 390                                 warner(
 391                                         packWARN(WARN_ILLEGALPROTO),
 392                                         "Illegal character in prototype for %"SVf" : %s",
 393                                         SVfARG(declarator), r
 394                                 );
 395                                 return;
 396
 397                         case '_':
 398                                 if (r[1] && !strchr(";@%", *r)) {
 399                                         warner(
 400                                                 packWARN(WARN_ILLEGALPROTO),
 401                                                 "Illegal character after '_' in prototype for %"SVf" : %s",
 402                                                 SVfARG(declarator), r
 403                                         );
 404                                         return;
 405                                 }
 406                                 break;
 407
 408                         case '@':
 409                         case '%':
 410                                 if (r[1]) {
 411                                         warner(
 412                                                 packWARN(WARN_ILLEGALPROTO),
 413                                                 "prototype after '%c' for %"SVf": %s",
 414                                                 *r, SVfARG(declarator), r + 1
 415                                         );
 416                                         return;
 417                                 }
 418                                 break;
 419
 420                         case '\\':
 421                                 r++;
 422                                 if (strchr("$@%&*", *r)) {
 423                                         break;
 424                                 }
 425                                 if (*r == '[') {
 426                                         r++;
 427                                         for (; r < end && *r != ']'; r++) {
 428                                                 if (!strchr("$@%&*", *r)) {
 429                                                         break;
 430                                                 }
 431                                         }
 432                                         if (*r == ']' && r[-1] != '[') {
 433                                                 break;
 434                                         }
 435                                 }
 436                                 warner(
 437                                         packWARN(WARN_ILLEGALPROTO),
 438                                         "Illegal character after '\\' in prototype for %"SVf" : %s",
 439                                         SVfARG(declarator), r
 440                                 );
 441                                 return;
 442
 443                         case '$':
 444                         case '*':
 445                         case '&':
 446                         case ';':
 447                         case '+':
 448                                 break;
 449                 }
 450         }
 451 }
 452
 453 static SV *parse_type(pTHX_ Sentinel, const SV *);
 454
 455 static SV *parse_type_paramd(pTHX_ Sentinel sen, const SV *declarator) {
 456         I32 c;
 457         SV *t;
 458
 459         t = my_scan_word(aTHX_ sen, TRUE);
 460         lex_read_space(0);
 461
 462         c = lex_peek_unichar(0);
 463         if (c == '[') {
 464                 SV *u;
 465
 466                 lex_read_unichar(0);
 467                 lex_read_space(0);
 468                 my_sv_cat_c(aTHX_ t, c);
 469
 470                 u = parse_type(aTHX_ sen, declarator);
 471                 sv_catsv(t, u);
 472
 473                 c = lex_peek_unichar(0);
 474                 if (c != ']') {
 475                         croak("In %"SVf": missing ']' after '%"SVf"'", SVfARG(declarator), SVfARG(t));
 476                 }
 477                 lex_read_unichar(0);
 478                 lex_read_space(0);
 479
 480                 my_sv_cat_c(aTHX_ t, c);
 481         }
 482
 483         return t;
 484 }
 485
 486 static SV *parse_type(pTHX_ Sentinel sen, const SV *declarator) {
 487         I32 c;
 488         SV *t;
 489
 490         t = parse_type_paramd(aTHX_ sen, declarator);
 491
 492         c = lex_peek_unichar(0);
 493         while (c == '|') {
 494                 SV *u;
 495
 496                 lex_read_unichar(0);
 497                 lex_read_space(0);
 498
 499                 my_sv_cat_c(aTHX_ t, c);
 500                 u = parse_type_paramd(aTHX_ sen, declarator);
 501                 sv_catsv(t, u);
 502
 503                 c = lex_peek_unichar(0);
 504         }
 505
 506         return t;
 507 }
 508
 509 static SV *reify_type(pTHX_ Sentinel sen, const SV *declarator, SV *name) {
 510         SV *t;
 511         int n;
 512         dSP;
 513
 514         my_require(aTHX_ "Moose/Util/TypeConstraints.pm");
 515
 516         ENTER;
 517         SAVETMPS;
 518
 519         PUSHMARK(SP);
 520         EXTEND(SP, 1);
 521         PUSHs(name);
 522         PUTBACK;
 523
 524         n = call_pv("Moose::Util::TypeConstraints::find_or_create_isa_type_constraint", G_SCALAR);
 525         SPAGAIN;
 526
 527         assert(n == 1);
 528         /* don't warn about n being unused if assert() is compiled out */
 529         n = n;
 530
 531         t = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 532
 533         PUTBACK;
 534         FREETMPS;
 535         LEAVE;
 536
 537         if (!SvTRUE(t)) {
 538                 croak("In %"SVf": undefined type '%"SVf"'", SVfARG(declarator), SVfARG(name));
 539         }
 540
 541         return t;
 542 }
 543
 544
 545 DEFSTRUCT(Param) {
 546         SV *name;
 547         PADOFFSET padoff;
 548         SV *type;
 549 };
 550
 551 DEFSTRUCT(ParamInit) {
 552         Param param;
 553         OpGuard init;
 554 };
 555
 556 #define VEC(B) B ## _Vec
 557
 558 #define DEFVECTOR(B) DEFSTRUCT(VEC(B)) { \
 559         B (*data); \
 560         size_t used, size; \
 561 }
 562
 563 DEFVECTOR(Param);
 564 DEFVECTOR(ParamInit);
 565
 566 #define DEFVECTOR_INIT(N, B) static void N(VEC(B) *p) { \
 567         p->used = 0; \
 568         p->size = 23; \
 569         Newx(p->data, p->size, B); \
 570 } static void N(VEC(B) *)
 571
 572 DEFSTRUCT(ParamSpec) {
 573         Param invocant;
 574         VEC(Param) positional_required;
 575         VEC(ParamInit) positional_optional;
 576         VEC(Param) named_required;
 577         VEC(ParamInit) named_optional;
 578         Param slurpy;
 579         PADOFFSET rest_hash;
 580 };
 581
 582 DEFVECTOR_INIT(pv_init, Param);
 583 DEFVECTOR_INIT(piv_init, ParamInit);
 584
 585 static void p_init(Param *p) {
 586         p->name = NULL;
 587         p->padoff = NOT_IN_PAD;
 588         p->type = NULL;
 589 }
 590
 591 static void ps_init(ParamSpec *ps) {
 592         p_init(&ps->invocant);
 593         pv_init(&ps->positional_required);
 594         piv_init(&ps->positional_optional);
 595         pv_init(&ps->named_required);
 596         piv_init(&ps->named_optional);
 597         p_init(&ps->slurpy);
 598         ps->rest_hash = NOT_IN_PAD;
 599 }
 600
 601 #define DEFVECTOR_EXTEND(N, B) static B (*N(VEC(B) *p)) { \
 602         assert(p->used <= p->size); \
 603         if (p->used == p->size) { \
 604                 const size_t n = p->size / 2 * 3 + 1; \
 605                 Renew(p->data, n, B); \
 606                 p->size = n; \
 607         } \
 608         return &p->data[p->used]; \
 609 } static B (*N(VEC(B) *))
 610
 611 DEFVECTOR_EXTEND(pv_extend, Param);
 612 DEFVECTOR_EXTEND(piv_extend, ParamInit);
 613
 614 #define DEFVECTOR_CLEAR(N, B, F) static void N(pTHX_ VEC(B) *p) { \
 615         while (p->used) { \
 616                 p->used--; \
 617                 F(aTHX_ &p->data[p->used]); \
 618         } \
 619         Safefree(p->data); \
 620         p->data = NULL; \
 621         p->size = 0; \
 622 } static void N(pTHX_ VEC(B) *)
 623
 624 static void p_clear(pTHX_ Param *p) {
 625         p->name = NULL;
 626         p->padoff = NOT_IN_PAD;
 627         p->type = NULL;
 628 }
 629
 630 static void pi_clear(pTHX_ ParamInit *pi) {
 631         p_clear(aTHX_ &pi->param);
 632         op_guard_clear(aTHX_ &pi->init);
 633 }
 634
 635 DEFVECTOR_CLEAR(pv_clear, Param, p_clear);
 636 DEFVECTOR_CLEAR(piv_clear, ParamInit, pi_clear);
 637
 638 static void ps_clear(pTHX_ ParamSpec *ps) {
 639         p_clear(aTHX_ &ps->invocant);
 640
 641         pv_clear(aTHX_ &ps->positional_required);
 642         piv_clear(aTHX_ &ps->positional_optional);
 643
 644         pv_clear(aTHX_ &ps->named_required);
 645         piv_clear(aTHX_ &ps->named_optional);
 646
 647         p_clear(aTHX_ &ps->slurpy);
 648 }
 649
 650 static int ps_contains(pTHX_ const ParamSpec *ps, SV *sv) {
 651         size_t i, lim;
 652
 653         if (ps->invocant.name && sv_eq(sv, ps->invocant.name)) {
 654                 return 1;
 655         }
 656
 657         for (i = 0, lim = ps->positional_required.used; i < lim; i++) {
 658                 if (sv_eq(sv, ps->positional_required.data[i].name)) {
 659                         return 1;
 660                 }
 661         }
 662
 663         for (i = 0, lim = ps->positional_optional.used; i < lim; i++) {
 664                 if (sv_eq(sv, ps->positional_optional.data[i].param.name)) {
 665                         return 1;
 666                 }
 667         }
 668
 669         for (i = 0, lim = ps->named_required.used; i < lim; i++) {
 670                 if (sv_eq(sv, ps->named_required.data[i].name)) {
 671                         return 1;
 672                 }
 673         }
 674
 675         for (i = 0, lim = ps->named_optional.used; i < lim; i++) {
 676                 if (sv_eq(sv, ps->named_optional.data[i].param.name)) {
 677                         return 1;
 678                 }
 679         }
 680
 681         return 0;
 682 }
 683
 684 static void ps_free_void(pTHX_ void *p) {
 685         ps_clear(aTHX_ p);
 686         Safefree(p);
 687 }
 688
 689 static int args_min(pTHX_ const ParamSpec *ps, const KWSpec *ks) {
 690         int n = 0;
 691         if (!ps) {
 692                 return SvTRUE(ks->shift) ? 1 : 0;
 693         }
 694         if (ps->invocant.name) {
 695                 n++;
 696         }
 697         n += ps->positional_required.used;
 698         n += ps->named_required.used * 2;
 699         return n;
 700 }
 701
 702 static int args_max(const ParamSpec *ps) {
 703         int n = 0;
 704         if (!ps) {
 705                 return -1;
 706         }
 707         if (ps->invocant.name) {
 708                 n++;
 709         }
 710         n += ps->positional_required.used;
 711         n += ps->positional_optional.used;
 712         if (ps->named_required.used || ps->named_optional.used || ps->slurpy.name) {
 713                 n = -1;
 714         }
 715         return n;
 716 }
 717
 718 static size_t count_positional_params(const ParamSpec *ps) {
 719         return ps->positional_required.used + ps->positional_optional.used;
 720 }
 721
 722 static size_t count_named_params(const ParamSpec *ps) {
 723         return ps->named_required.used + ps->named_optional.used;
 724 }
 725
 726 static SV *my_eval(pTHX_ Sentinel sen, I32 floor, OP *op) {
 727         SV *sv;
 728         CV *cv;
 729         dSP;
 730
 731         cv = newATTRSUB(floor, NULL, NULL, NULL, op);
 732
 733         ENTER;
 734         SAVETMPS;
 735
 736         PUSHMARK(SP);
 737         call_sv((SV *)cv, G_SCALAR | G_NOARGS);
 738         SPAGAIN;
 739         sv = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 740
 741         PUTBACK;
 742         FREETMPS;
 743         LEAVE;
 744
 745         return sv;
 746 }
 747
 748 enum {
 749         PARAM_INVOCANT = 0x01,
 750         PARAM_NAMED    = 0x02
 751 };
 752
 753 static PADOFFSET parse_param(
 754         pTHX_
 755         Sentinel sen,
 756         const SV *declarator, const KWSpec *spec, ParamSpec *param_spec,
 757         int *pflags, SV **pname, OpGuard *ginit, SV **ptype
 758 ) {
 759         I32 c;
 760         char sigil;
 761         SV *name;
 762
 763         assert(!ginit->op);
 764         *pflags = 0;
 765         *ptype = NULL;
 766
 767         c = lex_peek_unichar(0);
 768
 769         if (spec->flags & FLAG_TYPES_OK) {
 770                 if (c == '(') {
 771                         I32 floor;
 772                         OP *expr;
 773                         Resource *expr_sentinel;
 774
 775                         lex_read_unichar(0);
 776
 777                         floor = start_subparse(FALSE, 0);
 778                         SAVEFREESV(PL_compcv);
 779                         CvSPECIAL_on(PL_compcv);
 780
 781                         if (!(expr = parse_fullexpr(PARSE_OPTIONAL))) {
 782                                 croak("In %"SVf": invalid type expression", SVfARG(declarator));
 783                         }
 784                         if (MY_OP_SLABBED(expr)) {
 785                                 expr_sentinel = NULL;
 786                         } else {
 787                                 expr_sentinel = sentinel_register(sen, expr, free_op_void);
 788                         }
 789
 790                         lex_read_space(0);
 791                         c = lex_peek_unichar(0);
 792                         if (c != ')') {
 793                                 croak("In %"SVf": missing ')' after type expression", SVfARG(declarator));
 794                         }
 795                         lex_read_unichar(0);
 796                         lex_read_space(0);
 797
 798                         SvREFCNT_inc_simple_void(PL_compcv);
 799                         if (expr_sentinel) {
 800                                 sentinel_disarm(expr_sentinel);
 801                         }
 802                         *ptype = my_eval(aTHX_ sen, floor, expr);
 803                         if (!SvROK(*ptype)) {
 804                                 *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 805                         }
 806                         if (!sv_isobject(*ptype)) {
 807                                 croak("In %"SVf": (%"SVf") doesn't look like a type object", SVfARG(declarator), SVfARG(*ptype));
 808                         }
 809
 810                         c = lex_peek_unichar(0);
 811                 } else if (MY_UNI_IDFIRST(c)) {
 812                         *ptype = parse_type(aTHX_ sen, declarator);
 813                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 814
 815                         c = lex_peek_unichar(0);
 816                 }
 817         }
 818
 819         if (c == ':') {
 820                 lex_read_unichar(0);
 821                 lex_read_space(0);
 822
 823                 *pflags |= PARAM_NAMED;
 824
 825                 c = lex_peek_unichar(0);
 826         }
 827
 828         if (c == -1) {
 829                 croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 830         }
 831
 832         if (!(c == '$' || c == '@' || c == '%')) {
 833                 croak("In %"SVf": unexpected '%c' in parameter list (expecting a sigil)", SVfARG(declarator), (int)c);
 834         }
 835
 836         sigil = c;
 837
 838         lex_read_unichar(0);
 839         lex_read_space(0);
 840
 841         if (!(name = my_scan_word(aTHX_ sen, FALSE))) {
 842                 croak("In %"SVf": missing identifier after '%c'", SVfARG(declarator), sigil);
 843         }
 844         sv_insert(name, 0, 0, &sigil, 1);
 845         *pname = name;
 846
 847         lex_read_space(0);
 848         c = lex_peek_unichar(0);
 849
 850         if (c == '=') {
 851                 lex_read_unichar(0);
 852                 lex_read_space(0);
 853
 854
 855                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
 856                         param_spec->invocant.name = spec->shift;
 857                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
 858                 }
 859
 860                 op_guard_update(ginit, parse_termexpr(0));
 861
 862                 lex_read_space(0);
 863                 c = lex_peek_unichar(0);
 864         }
 865
 866         if (c == ':') {
 867                 *pflags |= PARAM_INVOCANT;
 868                 lex_read_unichar(0);
 869                 lex_read_space(0);
 870         } else if (c == ',') {
 871                 lex_read_unichar(0);
 872                 lex_read_space(0);
 873         } else if (c != ')') {
 874                 if (c == -1) {
 875                         croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 876                 }
 877                 croak("In %"SVf": unexpected '%c' in parameter list (expecting ',')", SVfARG(declarator), (int)c);
 878         }
 879
 880         return pad_add_name_sv(*pname, IF_HAVE_PERL_5_16(padadd_NO_DUP_CHECK, 0), NULL, NULL);
 881 }
 882
 883 static OP *my_var_g(pTHX_ I32 type, I32 flags, PADOFFSET padoff) {
 884         OP *var = newOP(type, flags);
 885         var->op_targ = padoff;
 886         return var;
 887 }
 888
 889 static OP *my_var(pTHX_ I32 flags, PADOFFSET padoff) {
 890         return my_var_g(aTHX_ OP_PADSV, flags, padoff);
 891 }
 892
 893 static OP *mkhvelem(pTHX_ PADOFFSET h, OP *k) {
 894         OP *hv = my_var_g(aTHX_ OP_PADHV, OPf_REF, h);
 895         return newBINOP(OP_HELEM, 0, hv, k);
 896 }
 897
 898 static OP *mkconstsv(pTHX_ SV *sv) {
 899         return newSVOP(OP_CONST, 0, sv);
 900 }
 901
 902 static OP *mkconstiv(pTHX_ IV i) {
 903         return mkconstsv(aTHX_ newSViv(i));
 904 }
 905
 906 static OP *mkconstpv(pTHX_ const char *p, size_t n) {
 907         return mkconstsv(aTHX_ newSVpv(p, n));
 908 }
 909
 910 #define mkconstpvs(S) mkconstpv(aTHX_ "" S "", sizeof S - 1)
 911
 912 static OP *mktypecheck(pTHX_ const SV *declarator, int nr, SV *name, PADOFFSET padoff, SV *type) {
 913         /* $type->check($value) or Carp::croak "...: " . $type->get_message($value) */
 914         OP *chk, *err, *msg, *xcroak;
 915
 916         err = mkconstsv(aTHX_ newSVpvf("In %"SVf": parameter %d (%"SVf"): ", SVfARG(declarator), nr, SVfARG(name)));
 917         {
 918                 OP *args = NULL;
 919
 920                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 921                 args = op_append_elem(
 922                         OP_LIST, args,
 923                         padoff == NOT_IN_PAD
 924                                 ? S_newDEFSVOP(aTHX)
 925                                 : my_var(aTHX_ 0, padoff)
 926                 );
 927                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("get_message")));
 928
 929                 msg = args;
 930                 msg->op_type = OP_ENTERSUB;
 931                 msg->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 932                 msg->op_flags |= OPf_STACKED;
 933         }
 934
 935         msg = newBINOP(OP_CONCAT, 0, err, msg);
 936
 937         xcroak = newCVREF(
 938                 OPf_WANT_SCALAR,
 939                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
 940         );
 941         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
 942
 943         {
 944                 OP *args = NULL;
 945
 946                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 947                 args = op_append_elem(
 948                         OP_LIST, args,
 949                         padoff == NOT_IN_PAD
 950                                 ? S_newDEFSVOP(aTHX)
 951                                 : my_var(aTHX_ 0, padoff)
 952                 );
 953                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("check")));
 954
 955                 chk = args;
 956                 chk->op_type = OP_ENTERSUB;
 957                 chk->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 958                 chk->op_flags |= OPf_STACKED;
 959         }
 960
 961         chk = newLOGOP(OP_OR, 0, chk, xcroak);
 962         return chk;
 963 }
 964
 965 static OP *mktypecheckp(pTHX_ const SV *declarator, int nr, const Param *param) {
 966         return mktypecheck(aTHX_ declarator, nr, param->name, param->padoff, param->type);
 967 }
 968
 969 static void register_info(pTHX_ UV key, SV *declarator, const KWSpec *kws, const ParamSpec *ps) {
 970         dSP;
 971
 972         ENTER;
 973         SAVETMPS;
 974
 975         PUSHMARK(SP);
 976         EXTEND(SP, 10);
 977
 978         /* 0 */ {
 979                 mPUSHu(key);
 980         }
 981         /* 1 */ {
 982                 STRLEN n;
 983                 char *p = SvPV(declarator, n);
 984                 char *q = memchr(p, ' ', n);
 985                 SV *tmp = newSVpvn_utf8(p, q ? (size_t)(q - p) : n, SvUTF8(declarator));
 986                 mPUSHs(tmp);
 987         }
 988         if (!ps) {
 989                 if (SvTRUE(kws->shift)) {
 990                         PUSHs(kws->shift);
 991                 } else {
 992                         PUSHmortal;
 993                 }
 994                 PUSHmortal;
 995                 mPUSHs(newRV_noinc((SV *)newAV()));
 996                 mPUSHs(newRV_noinc((SV *)newAV()));
 997                 mPUSHs(newRV_noinc((SV *)newAV()));
 998                 mPUSHs(newRV_noinc((SV *)newAV()));
 999                 mPUSHp("@_", 2);
1000                 PUSHmortal;
1001         } else {
1002                 /* 2, 3 */ {
1003                         if (ps->invocant.name) {
1004                                 PUSHs(ps->invocant.name);
1005                                 if (ps->invocant.type) {
1006                                         PUSHs(ps->invocant.type);
1007                                 } else {
1008                                         PUSHmortal;
1009                                 }
1010                         } else {
1011                                 PUSHmortal;
1012                                 PUSHmortal;
1013                         }
1014                 }
1015                 /* 4 */ {
1016                         size_t i, lim;
1017                         AV *av;
1018
1019                         lim = ps->positional_required.used;
1020
1021                         av = newAV();
1022                         if (lim) {
1023                                 av_extend(av, (lim - 1) * 2);
1024                                 for (i = 0; i < lim; i++) {
1025                                         Param *cur = &ps->positional_required.data[i];
1026                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1027                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1028                                 }
1029                         }
1030
1031                         mPUSHs(newRV_noinc((SV *)av));
1032                 }
1033                 /* 5 */ {
1034                         size_t i, lim;
1035                         AV *av;
1036
1037                         lim = ps->positional_optional.used;
1038
1039                         av = newAV();
1040                         if (lim) {
1041                                 av_extend(av, (lim - 1) * 2);
1042                                 for (i = 0; i < lim; i++) {
1043                                         Param *cur = &ps->positional_optional.data[i].param;
1044                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1045                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1046                                 }
1047                         }
1048
1049                         mPUSHs(newRV_noinc((SV *)av));
1050                 }
1051                 /* 6 */ {
1052                         size_t i, lim;
1053                         AV *av;
1054
1055                         lim = ps->named_required.used;
1056
1057                         av = newAV();
1058                         if (lim) {
1059                                 av_extend(av, (lim - 1) * 2);
1060                                 for (i = 0; i < lim; i++) {
1061                                         Param *cur = &ps->named_required.data[i];
1062                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1063                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1064                                 }
1065                         }
1066
1067                         mPUSHs(newRV_noinc((SV *)av));
1068                 }
1069                 /* 7 */ {
1070                         size_t i, lim;
1071                         AV *av;
1072
1073                         lim = ps->named_optional.used;
1074
1075                         av = newAV();
1076                         if (lim) {
1077                                 av_extend(av, (lim - 1) * 2);
1078                                 for (i = 0; i < lim; i++) {
1079                                         Param *cur = &ps->named_optional.data[i].param;
1080                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1081                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1082                                 }
1083                         }
1084
1085                         mPUSHs(newRV_noinc((SV *)av));
1086                 }
1087                 /* 8, 9 */ {
1088                         if (ps->slurpy.name) {
1089                                 PUSHs(ps->slurpy.name);
1090                                 if (ps->slurpy.type) {
1091                                         PUSHs(ps->slurpy.type);
1092                                 } else {
1093                                         PUSHmortal;
1094                                 }
1095                         } else {
1096                                 PUSHmortal;
1097                                 PUSHmortal;
1098                         }
1099                 }
1100         }
1101         PUTBACK;
1102
1103         call_pv(MY_PKG "::_register_info", G_VOID);
1104
1105         FREETMPS;
1106         LEAVE;
1107 }
1108
1109 static int parse_fun(pTHX_ Sentinel sen, OP **pop, const char *keyword_ptr, STRLEN keyword_len, const KWSpec *spec) {
1110         ParamSpec *param_spec;
1111         SV *declarator;
1112         I32 floor_ix;
1113         int save_ix;
1114         SV *saw_name;
1115         OpGuard *prelude_sentinel;
1116         SV *proto;
1117         OpGuard *attrs_sentinel;
1118         OP *body;
1119         unsigned builtin_attrs;
1120         I32 c;
1121
1122         declarator = sentinel_mortalize(sen, newSVpvn(keyword_ptr, keyword_len));
1123         if (lex_bufutf8()) {
1124                 SvUTF8_on(declarator);
1125         }
1126
1127         lex_read_space(0);
1128
1129         builtin_attrs = 0;
1130
1131         /* function name */
1132         saw_name = NULL;
1133         if ((spec->flags & FLAG_NAME_OK) && (saw_name = my_scan_word(aTHX_ sen, TRUE))) {
1134
1135                 if (PL_parser->expect != XSTATE) {
1136                         /* bail out early so we don't predeclare $saw_name */
1137                         croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
1138                 }
1139
1140                 sv_catpvs(declarator, " ");
1141                 sv_catsv(declarator, saw_name);
1142
1143                 if (
1144                         sv_eq_pvs(saw_name, "BEGIN") ||
1145                         sv_eq_pvs(saw_name, "END") ||
1146                         sv_eq_pvs(saw_name, "INIT") ||
1147                         sv_eq_pvs(saw_name, "CHECK") ||
1148                         sv_eq_pvs(saw_name, "UNITCHECK")
1149                 ) {
1150                         builtin_attrs |= MY_ATTR_SPECIAL;
1151                 }
1152
1153                 lex_read_space(0);
1154         } else if (!(spec->flags & FLAG_ANON_OK)) {
1155                 croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - PL_parser->bufptr), PL_parser->bufptr);
1156         } else {
1157                 sv_catpvs(declarator, " (anon)");
1158         }
1159
1160         /* we're a subroutine declaration */
1161         floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
1162         SAVEFREESV(PL_compcv);
1163
1164         /* create outer block: '{' */
1165         save_ix = S_block_start(aTHX_ TRUE);
1166
1167         /* initialize synthetic optree */
1168         Newx(prelude_sentinel, 1, OpGuard);
1169         op_guard_init(prelude_sentinel);
1170         sentinel_register(sen, prelude_sentinel, free_op_guard_void);
1171
1172         /* parameters */
1173         param_spec = NULL;
1174
1175         c = lex_peek_unichar(0);
1176         if (c == '(') {
1177                 OpGuard *init_sentinel;
1178
1179                 Newx(init_sentinel, 1, OpGuard);
1180                 op_guard_init(init_sentinel);
1181                 sentinel_register(sen, init_sentinel, free_op_guard_void);
1182
1183                 Newx(param_spec, 1, ParamSpec);
1184                 ps_init(param_spec);
1185                 sentinel_register(sen, param_spec, ps_free_void);
1186
1187                 lex_read_unichar(0);
1188                 lex_read_space(0);
1189
1190                 while ((c = lex_peek_unichar(0)) != ')') {
1191                         int flags;
1192                         SV *name, *type;
1193                         char sigil;
1194                         PADOFFSET padoff;
1195
1196                         padoff = parse_param(aTHX_ sen, declarator, spec, param_spec, &flags, &name, init_sentinel, &type);
1197
1198                         S_intro_my(aTHX);
1199
1200                         sigil = SvPV_nolen(name)[0];
1201
1202                         /* internal consistency */
1203                         if (flags & PARAM_NAMED) {
1204                                 if (flags & PARAM_INVOCANT) {
1205                                         croak("In %"SVf": invocant %"SVf" can't be a named parameter", SVfARG(declarator), SVfARG(name));
1206                                 }
1207                                 if (sigil != '$') {
1208                                         croak("In %"SVf": named parameter %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1209                                 }
1210                         } else if (flags & PARAM_INVOCANT) {
1211                                 if (init_sentinel->op) {
1212                                         croak("In %"SVf": invocant %"SVf" can't have a default value", SVfARG(declarator), SVfARG(name));
1213                                 }
1214                                 if (sigil != '$') {
1215                                         croak("In %"SVf": invocant %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1216                                 }
1217                         } else if (sigil != '$' && init_sentinel->op) {
1218                                 croak("In %"SVf": %s %"SVf" can't have a default value", SVfARG(declarator), sigil == '@' ? "array" : "hash", SVfARG(name));
1219                         }
1220
1221                         /* external constraints */
1222                         if (param_spec->slurpy.name) {
1223                                 croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(param_spec->slurpy.name), SVfARG(name));
1224                         }
1225                         if (sigil != '$') {
1226                                 assert(!init_sentinel->op);
1227                                 param_spec->slurpy.name = name;
1228                                 param_spec->slurpy.padoff = padoff;
1229                                 param_spec->slurpy.type = type;
1230                                 continue;
1231                         }
1232
1233                         if (!(flags & PARAM_NAMED) && count_named_params(param_spec)) {
1234                                 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));
1235                         }
1236
1237                         if (flags & PARAM_INVOCANT) {
1238                                 if (param_spec->invocant.name) {
1239                                         croak("In %"SVf": invalid double invocants %"SVf", %"SVf"", SVfARG(declarator), SVfARG(param_spec->invocant.name), SVfARG(name));
1240                                 }
1241                                 if (count_positional_params(param_spec) || count_named_params(param_spec)) {
1242                                         croak("In %"SVf": invocant %"SVf" must be first in parameter list", SVfARG(declarator), SVfARG(name));
1243                                 }
1244                                 if (!(spec->flags & FLAG_INVOCANT)) {
1245                                         croak("In %"SVf": invocant %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1246                                 }
1247                                 param_spec->invocant.name = name;
1248                                 param_spec->invocant.padoff = padoff;
1249                                 param_spec->invocant.type = type;
1250                                 continue;
1251                         }
1252
1253                         if (init_sentinel->op && !(spec->flags & FLAG_DEFAULT_ARGS)) {
1254                                 croak("In %"SVf": default argument for %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1255                         }
1256
1257                         if (ps_contains(aTHX_ param_spec, name)) {
1258                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(name));
1259                         }
1260
1261                         if (flags & PARAM_NAMED) {
1262                                 if (!(spec->flags & FLAG_NAMED_PARAMS)) {
1263                                         croak("In %"SVf": named parameter :%"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1264                                 }
1265
1266                                 if (init_sentinel->op) {
1267                                         ParamInit *pi = piv_extend(&param_spec->named_optional);
1268                                         pi->param.name = name;
1269                                         pi->param.padoff = padoff;
1270                                         pi->param.type = type;
1271                                         pi->init = op_guard_transfer(init_sentinel);
1272                                         param_spec->named_optional.used++;
1273                                 } else {
1274                                         Param *p;
1275
1276                                         if (param_spec->positional_optional.used) {
1277                                                 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));
1278                                         }
1279
1280                                         p = pv_extend(&param_spec->named_required);
1281                                         p->name = name;
1282                                         p->padoff = padoff;
1283                                         p->type = type;
1284                                         param_spec->named_required.used++;
1285                                 }
1286                         } else {
1287                                 if (init_sentinel->op || param_spec->positional_optional.used) {
1288                                         ParamInit *pi = piv_extend(&param_spec->positional_optional);
1289                                         pi->param.name = name;
1290                                         pi->param.padoff = padoff;
1291                                         pi->param.type = type;
1292                                         pi->init = op_guard_transfer(init_sentinel);
1293                                         param_spec->positional_optional.used++;
1294                                 } else {
1295                                         Param *p = pv_extend(&param_spec->positional_required);
1296                                         p->name = name;
1297                                         p->padoff = padoff;
1298                                         p->type = type;
1299                                         param_spec->positional_required.used++;
1300                                 }
1301                         }
1302
1303                 }
1304                 lex_read_unichar(0);
1305                 lex_read_space(0);
1306
1307                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
1308                         if (ps_contains(aTHX_ param_spec, spec->shift)) {
1309                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(spec->shift));
1310                         }
1311
1312                         param_spec->invocant.name = spec->shift;
1313                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
1314                 }
1315         }
1316
1317         /* prototype */
1318         proto = NULL;
1319         c = lex_peek_unichar(0);
1320         if (c == ':') {
1321                 lex_read_unichar(0);
1322                 lex_read_space(0);
1323
1324                 c = lex_peek_unichar(0);
1325                 if (c != '(') {
1326                         lex_stuff_pvs(":", 0);
1327                         c = ':';
1328                 } else {
1329                         lex_read_unichar(0);
1330                         if (!(proto = my_scan_parens_tail(aTHX_ sen, FALSE))) {
1331                                 croak("In %"SVf": prototype not terminated", SVfARG(declarator));
1332                         }
1333                         my_check_prototype(aTHX_ sen, declarator, proto);
1334                         lex_read_space(0);
1335                         c = lex_peek_unichar(0);
1336                         if (!(c == ':' || c == '{')) {
1337                                 lex_stuff_pvs(":", 0);
1338                                 c = ':';
1339                         }
1340                 }
1341         }
1342
1343         /* attributes */
1344         Newx(attrs_sentinel, 1, OpGuard);
1345         op_guard_init(attrs_sentinel);
1346         sentinel_register(sen, attrs_sentinel, free_op_guard_void);
1347
1348         if (c == ':' || c == '{') /* '}' - hi, vim */ {
1349
1350                 /* kludge default attributes in */
1351                 if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
1352                         lex_stuff_sv(spec->attrs, 0);
1353                         c = ':';
1354                 }
1355
1356                 if (c == ':') {
1357                         lex_read_unichar(0);
1358                         lex_read_space(0);
1359                         c = lex_peek_unichar(0);
1360
1361                         for (;;) {
1362                                 SV *attr;
1363
1364                                 if (!(attr = my_scan_word(aTHX_ sen, FALSE))) {
1365                                         break;
1366                                 }
1367
1368                                 lex_read_space(0);
1369                                 c = lex_peek_unichar(0);
1370
1371                                 if (c != '(') {
1372                                         if (sv_eq_pvs(attr, "lvalue")) {
1373                                                 builtin_attrs |= MY_ATTR_LVALUE;
1374                                                 attr = NULL;
1375                                         } else if (sv_eq_pvs(attr, "method")) {
1376                                                 builtin_attrs |= MY_ATTR_METHOD;
1377                                                 attr = NULL;
1378                                         }
1379                                 } else {
1380                                         SV *sv;
1381                                         lex_read_unichar(0);
1382                                         if (!(sv = my_scan_parens_tail(aTHX_ sen, TRUE))) {
1383                                                 croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
1384                                         }
1385                                         sv_catpvs(attr, "(");
1386                                         sv_catsv(attr, sv);
1387                                         sv_catpvs(attr, ")");
1388
1389                                         lex_read_space(0);
1390                                         c = lex_peek_unichar(0);
1391                                 }
1392
1393                                 if (attr) {
1394                                         op_guard_update(attrs_sentinel, op_append_elem(OP_LIST, attrs_sentinel->op, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(attr))));
1395                                 }
1396
1397                                 if (c == ':') {
1398                                         lex_read_unichar(0);
1399                                         lex_read_space(0);
1400                                         c = lex_peek_unichar(0);
1401                                 }
1402                         }
1403                 }
1404         }
1405
1406         /* body */
1407         if (c != '{') /* '}' - hi, vim */ {
1408                 croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
1409         }
1410
1411         /* surprise predeclaration! */
1412         if (saw_name) {
1413                 /* 'sub NAME (PROTO);' to make name/proto known to perl before it
1414                    starts parsing the body */
1415                 const I32 sub_ix = start_subparse(FALSE, 0);
1416                 SAVEFREESV(PL_compcv);
1417
1418                 SvREFCNT_inc_simple_void(PL_compcv);
1419
1420                 newATTRSUB(
1421                         sub_ix,
1422                         mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(saw_name)),
1423                         proto ? mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(proto)) : NULL,
1424                         NULL,
1425                         NULL
1426                 );
1427         }
1428
1429         if (builtin_attrs & MY_ATTR_LVALUE) {
1430                 CvLVALUE_on(PL_compcv);
1431         }
1432         if (builtin_attrs & MY_ATTR_METHOD) {
1433                 CvMETHOD_on(PL_compcv);
1434         }
1435         if (builtin_attrs & MY_ATTR_SPECIAL) {
1436                 CvSPECIAL_on(PL_compcv);
1437         }
1438
1439         /* check number of arguments */
1440         if (spec->flags & FLAG_CHECK_NARGS) {
1441                 int amin, amax;
1442
1443                 amin = args_min(aTHX_ param_spec, spec);
1444                 if (amin > 0) {
1445                         OP *chk, *cond, *err, *xcroak;
1446
1447                         err = mkconstsv(aTHX_ newSVpvf("Not enough arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amin));
1448                         err = newBINOP(
1449                                 OP_CONCAT, 0,
1450                                 err,
1451                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1452                         );
1453                         err = newBINOP(
1454                                 OP_CONCAT, 0,
1455                                 err,
1456                                 mkconstpvs(")")
1457                         );
1458
1459                         xcroak = newCVREF(OPf_WANT_SCALAR,
1460                                           newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV)));
1461                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1462                                       op_append_elem(OP_LIST, err, xcroak));
1463
1464                         cond = newBINOP(OP_LT, 0,
1465                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1466                                         mkconstiv(aTHX_ amin));
1467                         chk = newLOGOP(OP_AND, 0, cond, err);
1468
1469                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1470                 }
1471
1472                 amax = args_max(param_spec);
1473                 if (amax >= 0) {
1474                         OP *chk, *cond, *err, *xcroak;
1475
1476                         err = mkconstsv(aTHX_ newSVpvf("Too many arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amax));
1477                         err = newBINOP(
1478                                 OP_CONCAT, 0,
1479                                 err,
1480                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1481                         );
1482                         err = newBINOP(
1483                                 OP_CONCAT, 0,
1484                                 err,
1485                                 mkconstpvs(")")
1486                         );
1487
1488                         xcroak = newCVREF(
1489                                 OPf_WANT_SCALAR,
1490                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1491                         );
1492                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1493                         op_append_elem(OP_LIST, err, xcroak));
1494
1495                         cond = newBINOP(
1496                                 OP_GT, 0,
1497                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1498                                 mkconstiv(aTHX_ amax)
1499                         );
1500                         chk = newLOGOP(OP_AND, 0, cond, err);
1501
1502                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1503                 }
1504
1505                 if (param_spec && (count_named_params(param_spec) || (param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%'))) {
1506                         OP *chk, *cond, *err, *xcroak;
1507                         const UV fixed = count_positional_params(param_spec) + !!param_spec->invocant.name;
1508
1509                         err = mkconstsv(aTHX_ newSVpvf("Odd number of paired arguments for %"SVf"", SVfARG(declarator)));
1510
1511                         xcroak = newCVREF(
1512                                 OPf_WANT_SCALAR,
1513                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1514                         );
1515                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1516                         op_append_elem(OP_LIST, err, xcroak));
1517
1518                         cond = newBINOP(OP_GT, 0,
1519                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1520                                         mkconstiv(aTHX_ fixed));
1521                         cond = newLOGOP(OP_AND, 0,
1522                                         cond,
1523                                         newBINOP(OP_MODULO, 0,
1524                                                  fixed
1525                                                  ? newBINOP(OP_SUBTRACT, 0,
1526                                                             newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1527                                                             mkconstiv(aTHX_ fixed))
1528                                                  : newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1529                                                  mkconstiv(aTHX_ 2)));
1530                         chk = newLOGOP(OP_AND, 0, cond, err);
1531
1532                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1533                 }
1534         }
1535
1536         if (!param_spec) {
1537                 /* my $invocant = shift; */
1538                 if (SvTRUE(spec->shift)) {
1539                         OP *var;
1540
1541                         var = my_var(
1542                                 aTHX_
1543                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1544                                 pad_add_name_sv(spec->shift, 0, NULL, NULL)
1545                         );
1546                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1547
1548                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1549                 }
1550         } else {
1551                 /* my $invocant = shift; */
1552                 if (param_spec->invocant.name) {
1553                         OP *var;
1554
1555                         var = my_var(
1556                                 aTHX_
1557                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1558                                 param_spec->invocant.padoff
1559                         );
1560                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1561
1562                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1563
1564                         if (param_spec->invocant.type && (spec->flags & FLAG_CHECK_TARGS)) {
1565                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, 0, &param_spec->invocant))));
1566                         }
1567                 }
1568
1569                 /* my (...) = @_; */
1570                 {
1571                         OP *lhs;
1572                         size_t i, lim;
1573
1574                         lhs = NULL;
1575
1576                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1577                                 OP *const var = my_var(
1578                                         aTHX_
1579                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1580                                         param_spec->positional_required.data[i].padoff
1581                                 );
1582                                 lhs = op_append_elem(OP_LIST, lhs, var);
1583                         }
1584
1585                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1586                                 OP *const var = my_var(
1587                                         aTHX_
1588                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1589                                         param_spec->positional_optional.data[i].param.padoff
1590                                 );
1591                                 lhs = op_append_elem(OP_LIST, lhs, var);
1592                         }
1593
1594                         {
1595                                 PADOFFSET padoff;
1596                                 I32 type;
1597                                 bool slurpy_hash;
1598
1599                                 /*
1600                                  * cases:
1601                                  *  1) no named params
1602                                  *   1.1) slurpy
1603                                  *       => put it in
1604                                  *   1.2) no slurpy
1605                                  *       => nop
1606                                  *  2) named params
1607                                  *   2.1) no slurpy
1608                                  *       => synthetic %{rest}
1609                                  *   2.2) slurpy is a hash
1610                                  *       => put it in
1611                                  *   2.3) slurpy is an array
1612                                  *       => synthetic %{rest}
1613                                  *          remember to declare array later
1614                                  */
1615
1616                                 slurpy_hash = param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%';
1617                                 if (!count_named_params(param_spec)) {
1618                                         if (param_spec->slurpy.name) {
1619                                                 padoff = param_spec->slurpy.padoff;
1620                                                 type = slurpy_hash ? OP_PADHV : OP_PADAV;
1621                                         } else {
1622                                                 padoff = NOT_IN_PAD;
1623                                                 type = OP_PADSV;
1624                                         }
1625                                 } else if (slurpy_hash) {
1626                                         padoff = param_spec->slurpy.padoff;
1627                                         type = OP_PADHV;
1628                                 } else {
1629                                         padoff = param_spec->rest_hash = pad_add_name_pvs("%{rest}", 0, NULL, NULL);
1630                                         type = OP_PADHV;
1631                                 }
1632
1633                                 if (padoff != NOT_IN_PAD) {
1634                                         OP *const var = my_var_g(
1635                                                 aTHX_
1636                                                 type,
1637                                                 OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1638                                                 padoff
1639                                         );
1640
1641                                         lhs = op_append_elem(OP_LIST, lhs, var);
1642
1643                                         if (type == OP_PADHV) {
1644                                                 param_spec->rest_hash = padoff;
1645                                         }
1646                                 }
1647                         }
1648
1649                         if (lhs) {
1650                                 OP *rhs;
1651                                 lhs->op_flags |= OPf_PARENS;
1652                                 rhs = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
1653
1654                                 op_guard_update(prelude_sentinel, op_append_list(
1655                                         OP_LINESEQ, prelude_sentinel->op,
1656                                         newSTATEOP(
1657                                                 0, NULL,
1658                                                 newASSIGNOP(OPf_STACKED, lhs, 0, rhs)
1659                                         )
1660                                 ));
1661                         }
1662                 }
1663
1664                 /* default positional arguments */
1665                 {
1666                         size_t i, lim, req;
1667                         OP *nest;
1668
1669                         nest = NULL;
1670
1671                         req = param_spec->positional_required.used;
1672                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1673                                 ParamInit *cur = &param_spec->positional_optional.data[i];
1674                                 OP *var, *cond;
1675
1676                                 cond = newBINOP(
1677                                         OP_LT, 0,
1678                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1679                                         mkconstiv(aTHX_ req + i + 1)
1680                                 );
1681
1682                                 var = my_var(aTHX_ 0, cur->param.padoff);
1683
1684                                 nest = op_append_list(
1685                                         OP_LINESEQ, nest,
1686                                         newASSIGNOP(OPf_STACKED, var, 0, op_guard_relinquish(&cur->init))
1687                                 );
1688                                 nest = newCONDOP(
1689                                         0,
1690                                         cond,
1691                                         nest,
1692                                         NULL
1693                                 );
1694                         }
1695
1696                         op_guard_update(prelude_sentinel, op_append_list(
1697                                 OP_LINESEQ, prelude_sentinel->op,
1698                                 nest
1699                         ));
1700                 }
1701
1702                 /* named parameters */
1703                 if (count_named_params(param_spec)) {
1704                         size_t i, lim;
1705
1706                         assert(param_spec->rest_hash != NOT_IN_PAD);
1707
1708                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1709                                 Param *cur = &param_spec->named_required.data[i];
1710                                 size_t n;
1711                                 char *p = SvPV(cur->name, n);
1712                                 OP *var, *cond;
1713
1714                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1715
1716                                 if (spec->flags & FLAG_CHECK_NARGS) {
1717                                         OP *xcroak, *msg;
1718
1719                                         var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1720                                         var = newUNOP(OP_DELETE, 0, var);
1721
1722                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": missing named parameter: %.*s", SVfARG(declarator), (int)(n - 1), p + 1));
1723                                         xcroak = newCVREF(
1724                                                 OPf_WANT_SCALAR,
1725                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1726                                         );
1727                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1728
1729                                         cond = newUNOP(OP_EXISTS, 0, cond);
1730
1731                                         cond = newCONDOP(0, cond, var, xcroak);
1732                                 }
1733
1734                                 var = my_var(
1735                                         aTHX_
1736                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1737                                         cur->padoff
1738                                 );
1739                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1740
1741                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1742                         }
1743
1744                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1745                                 ParamInit *cur = &param_spec->named_optional.data[i];
1746                                 size_t n;
1747                                 char *p = SvPV(cur->param.name, n);
1748                                 OP *var, *cond;
1749
1750                                 var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1751                                 var = newUNOP(OP_DELETE, 0, var);
1752
1753                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1754                                 cond = newUNOP(OP_EXISTS, 0, cond);
1755
1756                                 cond = newCONDOP(0, cond, var, op_guard_relinquish(&cur->init));
1757
1758                                 var = my_var(
1759                                         aTHX_
1760                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1761                                         cur->param.padoff
1762                                 );
1763                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1764
1765                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1766                         }
1767
1768                         if (!param_spec->slurpy.name) {
1769                                 if (spec->flags & FLAG_CHECK_NARGS) {
1770                                         /* croak if %{rest} */
1771                                         OP *xcroak, *cond, *keys, *msg;
1772
1773                                         keys = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1774                                         keys = newLISTOP(OP_SORT, 0, newOP(OP_PUSHMARK, 0), keys);
1775                                         {
1776                                                 OP *first, *mid, *last;
1777
1778                                                 last = keys;
1779
1780                                                 mid = mkconstpvs(", ");
1781                                                 mid->op_sibling = last;
1782
1783                                                 first = newOP(OP_PUSHMARK, 0);
1784
1785                                                 keys = newLISTOP(OP_JOIN, 0, first, mid);
1786                                                 keys->op_targ = pad_alloc(OP_JOIN, SVs_PADTMP);
1787                                                 ((LISTOP *)keys)->op_last = last;
1788                                         }
1789
1790                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": no such named parameter: ", SVfARG(declarator)));
1791                                         msg = newBINOP(OP_CONCAT, 0, msg, keys);
1792
1793                                         xcroak = newCVREF(
1794                                                 OPf_WANT_SCALAR,
1795                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1796                                         );
1797                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1798
1799                                         cond = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1800                                         xcroak = newCONDOP(0, cond, xcroak, NULL);
1801
1802                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, xcroak)));
1803                                 } else {
1804                                         OP *clear;
1805
1806                                         clear = newASSIGNOP(
1807                                                 OPf_STACKED,
1808                                                 my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1809                                                 0,
1810                                                 newNULLLIST()
1811                                         );
1812
1813                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, clear)));
1814                                 }
1815                         } else if (param_spec->slurpy.padoff != param_spec->rest_hash) {
1816                                 OP *var, *clear;
1817
1818                                 assert(SvPV_nolen(param_spec->slurpy.name)[0] == '@');
1819
1820                                 var = my_var_g(
1821                                         aTHX_
1822                                         OP_PADAV,
1823                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1824                                         param_spec->slurpy.padoff
1825                                 );
1826
1827                                 var = newASSIGNOP(OPf_STACKED, var, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1828
1829                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1830
1831                                 clear = newASSIGNOP(
1832                                         OPf_STACKED,
1833                                         my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1834                                         0,
1835                                         newNULLLIST()
1836                                 );
1837
1838                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, clear)));
1839                         }
1840                 }
1841
1842                 if (spec->flags & FLAG_CHECK_TARGS) {
1843                         size_t i, lim, base;
1844
1845                         base = 1;
1846                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1847                                 Param *cur = &param_spec->positional_required.data[i];
1848
1849                                 if (cur->type) {
1850                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1851                                 }
1852                         }
1853                         base += i;
1854
1855                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1856                                 Param *cur = &param_spec->positional_optional.data[i].param;
1857
1858                                 if (cur->type) {
1859                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1860                                 }
1861                         }
1862                         base += i;
1863
1864                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1865                                 Param *cur = &param_spec->named_required.data[i];
1866
1867                                 if (cur->type) {
1868                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1869                                 }
1870                         }
1871                         base += i;
1872
1873                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1874                                 Param *cur = &param_spec->named_optional.data[i].param;
1875
1876                                 if (cur->type) {
1877                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1878                                 }
1879                         }
1880                         base += i;
1881
1882                         if (param_spec->slurpy.type) {
1883                                 /* $type->valid($_) or croak $type->get_message($_) for @rest / values %rest */
1884                                 OP *check, *list, *loop;
1885
1886                                 check = mktypecheck(aTHX_ declarator, base, param_spec->slurpy.name, NOT_IN_PAD, param_spec->slurpy.type);
1887
1888                                 if (SvPV_nolen(param_spec->slurpy.name)[0] == '@') {
1889                                         list = my_var_g(aTHX_ OP_PADAV, 0, param_spec->slurpy.padoff);
1890                                 } else {
1891                                         list = my_var_g(aTHX_ OP_PADHV, 0, param_spec->slurpy.padoff);
1892                                         list = newUNOP(OP_VALUES, 0, list);
1893                                 }
1894
1895                                 loop = newFOROP(0, NULL, list, check, NULL);
1896
1897                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, loop)));
1898                         }
1899                 }
1900         }
1901
1902         /* finally let perl parse the actual subroutine body */
1903         body = parse_block(0);
1904
1905         /* add '();' to make function return nothing by default */
1906         /* (otherwise the invisible parameter initialization can "leak" into
1907            the return value: fun ($x) {}->("asdf", 0) == 2) */
1908         if (prelude_sentinel->op) {
1909                 body = newSTATEOP(0, NULL, body);
1910         }
1911
1912         body = op_append_list(OP_LINESEQ, op_guard_relinquish(prelude_sentinel), body);
1913
1914         /* it's go time. */
1915         {
1916                 CV *cv;
1917                 OP *const attrs = op_guard_relinquish(attrs_sentinel);
1918
1919                 SvREFCNT_inc_simple_void(PL_compcv);
1920
1921                 /* close outer block: '}' */
1922                 S_block_end(aTHX_ save_ix, body);
1923
1924                 cv = newATTRSUB(
1925                         floor_ix,
1926                         saw_name ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)) : NULL,
1927                         proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
1928                         attrs,
1929                         body
1930                 );
1931
1932                 if (cv) {
1933                         register_info(aTHX_ PTR2UV(CvROOT(cv)), declarator, spec, param_spec);
1934                 }
1935
1936                 if (saw_name) {
1937                         *pop = newOP(OP_NULL, 0);
1938                         return KEYWORD_PLUGIN_STMT;
1939                 }
1940
1941                 *pop = newUNOP(
1942                         OP_REFGEN, 0,
1943                         newSVOP(
1944                                 OP_ANONCODE, 0,
1945                                 (SV *)cv
1946                         )
1947                 );
1948                 return KEYWORD_PLUGIN_EXPR;
1949         }
1950 }
1951
1952 static int kw_flags_enter(pTHX_ Sentinel sen, const char *kw_ptr, STRLEN kw_len, KWSpec *spec) {
1953         HV *hints;
1954         SV *sv, **psv;
1955         const char *p, *kw_active;
1956         STRLEN kw_active_len;
1957         bool kw_is_utf8;
1958
1959         if (!(hints = GvHV(PL_hintgv))) {
1960                 return FALSE;
1961         }
1962         if (!(psv = hv_fetchs(hints, HINTK_KEYWORDS, 0))) {
1963                 return FALSE;
1964         }
1965         sv = *psv;
1966         kw_active = SvPV(sv, kw_active_len);
1967         if (kw_active_len <= kw_len) {
1968                 return FALSE;
1969         }
1970
1971         kw_is_utf8 = lex_bufutf8();
1972
1973         for (
1974                 p = kw_active;
1975                 (p = strchr(p, *kw_ptr)) &&
1976                 p < kw_active + kw_active_len - kw_len;
1977                 p++
1978         ) {
1979                 if (
1980                         (p == kw_active || p[-1] == ' ') &&
1981                         p[kw_len] == ' ' &&
1982                         memcmp(kw_ptr, p, kw_len) == 0
1983                 ) {
1984                         ENTER;
1985                         SAVETMPS;
1986
1987                         SAVEDESTRUCTOR_X(sentinel_clear_void, sen);
1988
1989                         spec->flags = 0;
1990                         spec->shift = sentinel_mortalize(sen, newSVpvs(""));
1991                         spec->attrs = sentinel_mortalize(sen, newSVpvs(""));
1992
1993 #define FETCH_HINTK_INTO(NAME, PTR, LEN, X) STMT_START { \
1994         const char *fk_ptr_; \
1995         STRLEN fk_len_; \
1996         I32 fk_xlen_; \
1997         SV *fk_sv_; \
1998         fk_sv_ = sentinel_mortalize(sen, newSVpvs(HINTK_ ## NAME)); \
1999         sv_catpvn(fk_sv_, PTR, LEN); \
2000         fk_ptr_ = SvPV(fk_sv_, fk_len_); \
2001         fk_xlen_ = fk_len_; \
2002         if (kw_is_utf8) { \
2003                 fk_xlen_ = -fk_xlen_; \
2004         } \
2005         if (!((X) = hv_fetch(hints, fk_ptr_, fk_xlen_, 0))) { \
2006                 croak("%s: internal error: $^H{'%.*s'} not set", MY_PKG, (int)fk_len_, fk_ptr_); \
2007         } \
2008 } STMT_END
2009
2010                         FETCH_HINTK_INTO(FLAGS_, kw_ptr, kw_len, psv);
2011                         spec->flags = SvIV(*psv);
2012
2013                         FETCH_HINTK_INTO(SHIFT_, kw_ptr, kw_len, psv);
2014                         SvSetSV(spec->shift, *psv);
2015
2016                         FETCH_HINTK_INTO(ATTRS_, kw_ptr, kw_len, psv);
2017                         SvSetSV(spec->attrs, *psv);
2018
2019 #undef FETCH_HINTK_INTO
2020                         return TRUE;
2021                 }
2022         }
2023         return FALSE;
2024 }
2025
2026 static int my_keyword_plugin(pTHX_ char *keyword_ptr, STRLEN keyword_len, OP **op_ptr) {
2027         Sentinel sen = { NULL };
2028         KWSpec spec;
2029         int ret;
2030
2031         if (kw_flags_enter(aTHX_ sen, keyword_ptr, keyword_len, &spec)) {
2032                 /* scope was entered, 'sen' and 'spec' are initialized */
2033                 ret = parse_fun(aTHX_ sen, op_ptr, keyword_ptr, keyword_len, &spec);
2034                 FREETMPS;
2035                 LEAVE;
2036         } else {
2037                 /* not one of our keywords, no allocation done */
2038                 ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
2039         }
2040
2041         return ret;
2042 }
2043
2044 WARNINGS_RESET
2045
2046 MODULE = Function::Parameters   PACKAGE = Function::Parameters   PREFIX = fp_
2047 PROTOTYPES: ENABLE
2048
2049 UV
2050 fp__cv_root(sv)
2051         SV * sv
2052         PREINIT:
2053                 CV *xcv;
2054                 HV *hv;
2055                 GV *gv;
2056         CODE:
2057                 xcv = sv_2cv(sv, &hv, &gv, 0);
2058                 RETVAL = PTR2UV(xcv ? CvROOT(xcv) : NULL);
2059         OUTPUT:
2060                 RETVAL
2061
2062 BOOT:
2063 WARNINGS_ENABLE {
2064         HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
2065         /**/
2066         newCONSTSUB(stash, "FLAG_NAME_OK",      newSViv(FLAG_NAME_OK));
2067         newCONSTSUB(stash, "FLAG_ANON_OK",      newSViv(FLAG_ANON_OK));
2068         newCONSTSUB(stash, "FLAG_DEFAULT_ARGS", newSViv(FLAG_DEFAULT_ARGS));
2069         newCONSTSUB(stash, "FLAG_CHECK_NARGS",  newSViv(FLAG_CHECK_NARGS));
2070         newCONSTSUB(stash, "FLAG_INVOCANT",     newSViv(FLAG_INVOCANT));
2071         newCONSTSUB(stash, "FLAG_NAMED_PARAMS", newSViv(FLAG_NAMED_PARAMS));
2072         newCONSTSUB(stash, "FLAG_TYPES_OK",     newSViv(FLAG_TYPES_OK));
2073         newCONSTSUB(stash, "FLAG_CHECK_TARGS",  newSViv(FLAG_CHECK_TARGS));
2074         newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
2075         newCONSTSUB(stash, "HINTK_FLAGS_",   newSVpvs(HINTK_FLAGS_));
2076         newCONSTSUB(stash, "HINTK_SHIFT_",   newSVpvs(HINTK_SHIFT_));
2077         newCONSTSUB(stash, "HINTK_ATTRS_",   newSVpvs(HINTK_ATTRS_));
2078         /**/
2079         next_keyword_plugin = PL_keyword_plugin;
2080         PL_keyword_plugin = my_keyword_plugin;
2081 } WARNINGS_RESET