Parameters.xs

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