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         require_pv(file);
 778         if (SvTRUE(ERRSV)) {
 779                 croak_sv(ERRSV);
 780         }
 781 }
 782
 783 static SV *my_eval(pTHX_ Sentinel sen, I32 floor, OP *op) {
 784         SV *sv;
 785         CV *cv;
 786         dSP;
 787
 788         cv = newATTRSUB(floor, NULL, NULL, NULL, op);
 789
 790         ENTER;
 791         SAVETMPS;
 792
 793         PUSHMARK(SP);
 794         call_sv((SV *)cv, G_SCALAR | G_NOARGS);
 795         SPAGAIN;
 796         sv = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 797
 798         PUTBACK;
 799         FREETMPS;
 800         LEAVE;
 801
 802         return sv;
 803 }
 804
 805 enum {
 806         PARAM_INVOCANT = 0x01,
 807         PARAM_NAMED    = 0x02
 808 };
 809
 810 static PADOFFSET parse_param(
 811         pTHX_
 812         Sentinel sen,
 813         const SV *declarator, const KWSpec *spec, ParamSpec *param_spec,
 814         int *pflags, SV **pname, OpGuard *ginit, SV **ptype
 815 ) {
 816         I32 c;
 817         char sigil;
 818         SV *name;
 819
 820         assert(!ginit->op);
 821         *pflags = 0;
 822         *ptype = NULL;
 823
 824         c = lex_peek_unichar(0);
 825
 826         if (spec->flags & FLAG_TYPES_OK) {
 827                 if (c == '(') {
 828                         I32 floor;
 829                         OP *expr;
 830                         Resource *expr_sentinel;
 831
 832                         lex_read_unichar(0);
 833
 834                         floor = start_subparse(FALSE, 0);
 835                         SAVEFREESV(PL_compcv);
 836                         CvSPECIAL_on(PL_compcv);
 837
 838                         if (!(expr = parse_fullexpr(PARSE_OPTIONAL))) {
 839                                 croak("In %"SVf": invalid type expression", SVfARG(declarator));
 840                         }
 841                         if (MY_OP_SLABBED(expr)) {
 842                                 expr_sentinel = NULL;
 843                         } else {
 844                                 expr_sentinel = sentinel_register(sen, expr, free_op_void);
 845                         }
 846
 847                         lex_read_space(0);
 848                         c = lex_peek_unichar(0);
 849                         if (c != ')') {
 850                                 croak("In %"SVf": missing ')' after type expression", SVfARG(declarator));
 851                         }
 852                         lex_read_unichar(0);
 853                         lex_read_space(0);
 854
 855                         SvREFCNT_inc_simple_void(PL_compcv);
 856                         if (expr_sentinel) {
 857                                 sentinel_disarm(expr_sentinel);
 858                         }
 859                         *ptype = my_eval(aTHX_ sen, floor, expr);
 860                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 861                         if (!sv_isobject(*ptype)) {
 862                                 croak("In %"SVf": (%"SVf") doesn't look like a type object", SVfARG(declarator), SVfARG(*ptype));
 863                         }
 864
 865                         c = lex_peek_unichar(0);
 866                 } else if (MY_UNI_IDFIRST(c)) {
 867                         *ptype = parse_type(aTHX_ sen, declarator);
 868                         my_require(aTHX_ "Moose/Util/TypeConstraints.pm");
 869                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 870
 871                         c = lex_peek_unichar(0);
 872                 }
 873         }
 874
 875         if (c == ':') {
 876                 lex_read_unichar(0);
 877                 lex_read_space(0);
 878
 879                 *pflags |= PARAM_NAMED;
 880
 881                 c = lex_peek_unichar(0);
 882         }
 883
 884         if (c == -1) {
 885                 croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 886         }
 887
 888         if (!(c == '$' || c == '@' || c == '%')) {
 889                 croak("In %"SVf": unexpected '%c' in parameter list (expecting a sigil)", SVfARG(declarator), (int)c);
 890         }
 891
 892         sigil = c;
 893
 894         lex_read_unichar(0);
 895         lex_read_space(0);
 896
 897         if (!(name = my_scan_word(aTHX_ sen, FALSE))) {
 898                 croak("In %"SVf": missing identifier after '%c'", SVfARG(declarator), sigil);
 899         }
 900         sv_insert(name, 0, 0, &sigil, 1);
 901         *pname = name;
 902
 903         lex_read_space(0);
 904         c = lex_peek_unichar(0);
 905
 906         if (c == '=') {
 907                 lex_read_unichar(0);
 908                 lex_read_space(0);
 909
 910
 911                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
 912                         param_spec->invocant.name = spec->shift;
 913                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
 914                 }
 915
 916                 op_guard_update(ginit, parse_termexpr(0));
 917
 918                 lex_read_space(0);
 919                 c = lex_peek_unichar(0);
 920         }
 921
 922         if (c == ':') {
 923                 *pflags |= PARAM_INVOCANT;
 924                 lex_read_unichar(0);
 925                 lex_read_space(0);
 926         } else if (c == ',') {
 927                 lex_read_unichar(0);
 928                 lex_read_space(0);
 929         } else if (c != ')') {
 930                 if (c == -1) {
 931                         croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 932                 }
 933                 croak("In %"SVf": unexpected '%c' in parameter list (expecting ',')", SVfARG(declarator), (int)c);
 934         }
 935
 936         return pad_add_name_sv(*pname, IF_HAVE_PERL_5_16(padadd_NO_DUP_CHECK, 0), NULL, NULL);
 937 }
 938
 939 static OP *my_var_g(pTHX_ I32 type, I32 flags, PADOFFSET padoff) {
 940         OP *var = newOP(type, flags);
 941         var->op_targ = padoff;
 942         return var;
 943 }
 944
 945 static OP *my_var(pTHX_ I32 flags, PADOFFSET padoff) {
 946         return my_var_g(aTHX_ OP_PADSV, flags, padoff);
 947 }
 948
 949 static OP *mkhvelem(pTHX_ PADOFFSET h, OP *k) {
 950         OP *hv = my_var_g(aTHX_ OP_PADHV, OPf_REF, h);
 951         return newBINOP(OP_HELEM, 0, hv, k);
 952 }
 953
 954 static OP *mkconstsv(pTHX_ SV *sv) {
 955         return newSVOP(OP_CONST, 0, sv);
 956 }
 957
 958 static OP *mkconstiv(pTHX_ IV i) {
 959         return mkconstsv(aTHX_ newSViv(i));
 960 }
 961
 962 static OP *mkconstpv(pTHX_ const char *p, size_t n) {
 963         return mkconstsv(aTHX_ newSVpv(p, n));
 964 }
 965
 966 #define mkconstpvs(S) mkconstpv(aTHX_ "" S "", sizeof S - 1)
 967
 968 static OP *mktypecheck(pTHX_ const SV *declarator, int nr, SV *name, PADOFFSET padoff, SV *type) {
 969         /* $type->check($value) or Carp::croak "...: " . $type->get_message($value) */
 970         OP *chk, *err, *msg, *xcroak;
 971
 972         err = mkconstsv(aTHX_ newSVpvf("In %"SVf": parameter %d (%"SVf"): ", SVfARG(declarator), nr, SVfARG(name)));
 973         {
 974                 OP *args = NULL;
 975
 976                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 977                 args = op_append_elem(
 978                         OP_LIST, args,
 979                         padoff == NOT_IN_PAD
 980                                 ? S_newDEFSVOP(aTHX)
 981                                 : my_var(aTHX_ 0, padoff)
 982                 );
 983                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("get_message")));
 984
 985                 msg = args;
 986                 msg->op_type = OP_ENTERSUB;
 987                 msg->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 988                 msg->op_flags |= OPf_STACKED;
 989         }
 990
 991         msg = newBINOP(OP_CONCAT, 0, err, msg);
 992
 993         xcroak = newCVREF(
 994                 OPf_WANT_SCALAR,
 995                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
 996         );
 997         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
 998
 999         {
1000                 OP *args = NULL;
1001
1002                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
1003                 args = op_append_elem(
1004                         OP_LIST, args,
1005                         padoff == NOT_IN_PAD
1006                                 ? S_newDEFSVOP(aTHX)
1007                                 : my_var(aTHX_ 0, padoff)
1008                 );
1009                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("check")));
1010
1011                 chk = args;
1012                 chk->op_type = OP_ENTERSUB;
1013                 chk->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
1014                 chk->op_flags |= OPf_STACKED;
1015         }
1016
1017         chk = newLOGOP(OP_OR, 0, chk, xcroak);
1018         return chk;
1019 }
1020
1021 static OP *mktypecheckp(pTHX_ const SV *declarator, int nr, const Param *param) {
1022         return mktypecheck(aTHX_ declarator, nr, param->name, param->padoff, param->type);
1023 }
1024
1025 static void register_info(pTHX_ UV key, SV *declarator, const KWSpec *kws, const ParamSpec *ps) {
1026         dSP;
1027
1028         ENTER;
1029         SAVETMPS;
1030
1031         PUSHMARK(SP);
1032         EXTEND(SP, 10);
1033
1034         /* 0 */ {
1035                 mPUSHu(key);
1036         }
1037         /* 1 */ {
1038                 size_t n;
1039                 char *p = SvPV(declarator, n);
1040                 char *q = memchr(p, ' ', n);
1041                 mPUSHp(p, q ? (size_t)(q - p) : n);
1042         }
1043         if (!ps) {
1044                 if (SvTRUE(kws->shift)) {
1045                         PUSHs(kws->shift);
1046                 } else {
1047                         PUSHmortal;
1048                 }
1049                 PUSHmortal;
1050                 mPUSHs(newRV_noinc((SV *)newAV()));
1051                 mPUSHs(newRV_noinc((SV *)newAV()));
1052                 mPUSHs(newRV_noinc((SV *)newAV()));
1053                 mPUSHs(newRV_noinc((SV *)newAV()));
1054                 mPUSHp("@_", 2);
1055                 PUSHmortal;
1056         } else {
1057                 /* 2, 3 */ {
1058                         if (ps->invocant.name) {
1059                                 PUSHs(ps->invocant.name);
1060                                 if (ps->invocant.type) {
1061                                         PUSHs(ps->invocant.type);
1062                                 } else {
1063                                         PUSHmortal;
1064                                 }
1065                         } else {
1066                                 PUSHmortal;
1067                                 PUSHmortal;
1068                         }
1069                 }
1070                 /* 4 */ {
1071                         size_t i, lim;
1072                         AV *av;
1073
1074                         lim = ps->positional_required.used;
1075
1076                         av = newAV();
1077                         if (lim) {
1078                                 av_extend(av, (lim - 1) * 2);
1079                                 for (i = 0; i < lim; i++) {
1080                                         Param *cur = &ps->positional_required.data[i];
1081                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1082                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1083                                 }
1084                         }
1085
1086                         mPUSHs(newRV_noinc((SV *)av));
1087                 }
1088                 /* 5 */ {
1089                         size_t i, lim;
1090                         AV *av;
1091
1092                         lim = ps->positional_optional.used;
1093
1094                         av = newAV();
1095                         if (lim) {
1096                                 av_extend(av, (lim - 1) * 2);
1097                                 for (i = 0; i < lim; i++) {
1098                                         Param *cur = &ps->positional_optional.data[i].param;
1099                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1100                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1101                                 }
1102                         }
1103
1104                         mPUSHs(newRV_noinc((SV *)av));
1105                 }
1106                 /* 6 */ {
1107                         size_t i, lim;
1108                         AV *av;
1109
1110                         lim = ps->named_required.used;
1111
1112                         av = newAV();
1113                         if (lim) {
1114                                 av_extend(av, (lim - 1) * 2);
1115                                 for (i = 0; i < lim; i++) {
1116                                         Param *cur = &ps->named_required.data[i];
1117                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1118                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1119                                 }
1120                         }
1121
1122                         mPUSHs(newRV_noinc((SV *)av));
1123                 }
1124                 /* 7 */ {
1125                         size_t i, lim;
1126                         AV *av;
1127
1128                         lim = ps->named_optional.used;
1129
1130                         av = newAV();
1131                         if (lim) {
1132                                 av_extend(av, (lim - 1) * 2);
1133                                 for (i = 0; i < lim; i++) {
1134                                         Param *cur = &ps->named_optional.data[i].param;
1135                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1136                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1137                                 }
1138                         }
1139
1140                         mPUSHs(newRV_noinc((SV *)av));
1141                 }
1142                 /* 8, 9 */ {
1143                         if (ps->slurpy.name) {
1144                                 PUSHs(ps->slurpy.name);
1145                                 if (ps->slurpy.type) {
1146                                         PUSHs(ps->slurpy.type);
1147                                 } else {
1148                                         PUSHmortal;
1149                                 }
1150                         } else {
1151                                 PUSHmortal;
1152                                 PUSHmortal;
1153                         }
1154                 }
1155         }
1156         PUTBACK;
1157
1158         call_pv(MY_PKG "::_register_info", G_VOID);
1159
1160         FREETMPS;
1161         LEAVE;
1162 }
1163
1164 static int parse_fun(pTHX_ Sentinel sen, OP **pop, const char *keyword_ptr, STRLEN keyword_len, const KWSpec *spec) {
1165         ParamSpec *param_spec;
1166         SV *declarator;
1167         I32 floor_ix;
1168         int save_ix;
1169         SV *saw_name;
1170         OpGuard *prelude_sentinel;
1171         SV *proto;
1172         OpGuard *attrs_sentinel;
1173         OP *body;
1174         unsigned builtin_attrs;
1175         I32 c;
1176
1177         declarator = sentinel_mortalize(sen, newSVpvn(keyword_ptr, keyword_len));
1178
1179         lex_read_space(0);
1180
1181         builtin_attrs = 0;
1182
1183         /* function name */
1184         saw_name = NULL;
1185         if ((spec->flags & FLAG_NAME_OK) && (saw_name = my_scan_word(aTHX_ sen, TRUE))) {
1186
1187                 if (PL_parser->expect != XSTATE) {
1188                         /* bail out early so we don't predeclare $saw_name */
1189                         croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
1190                 }
1191
1192                 sv_catpvs(declarator, " ");
1193                 sv_catsv(declarator, saw_name);
1194
1195                 if (
1196                         sv_eq_pvs(saw_name, "BEGIN") ||
1197                         sv_eq_pvs(saw_name, "END") ||
1198                         sv_eq_pvs(saw_name, "INIT") ||
1199                         sv_eq_pvs(saw_name, "CHECK") ||
1200                         sv_eq_pvs(saw_name, "UNITCHECK")
1201                 ) {
1202                         builtin_attrs |= MY_ATTR_SPECIAL;
1203                 }
1204
1205                 lex_read_space(0);
1206         } else if (!(spec->flags & FLAG_ANON_OK)) {
1207                 croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - PL_parser->bufptr), PL_parser->bufptr);
1208         } else {
1209                 sv_catpvs(declarator, " (anon)");
1210         }
1211
1212         /* we're a subroutine declaration */
1213         floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
1214         SAVEFREESV(PL_compcv);
1215
1216         /* create outer block: '{' */
1217         save_ix = S_block_start(aTHX_ TRUE);
1218
1219         /* initialize synthetic optree */
1220         Newx(prelude_sentinel, 1, OpGuard);
1221         op_guard_init(prelude_sentinel);
1222         sentinel_register(sen, prelude_sentinel, free_op_guard_void);
1223
1224         /* parameters */
1225         param_spec = NULL;
1226
1227         c = lex_peek_unichar(0);
1228         if (c == '(') {
1229                 OpGuard *init_sentinel;
1230
1231                 Newx(init_sentinel, 1, OpGuard);
1232                 op_guard_init(init_sentinel);
1233                 sentinel_register(sen, init_sentinel, free_op_guard_void);
1234
1235                 Newx(param_spec, 1, ParamSpec);
1236                 ps_init(param_spec);
1237                 sentinel_register(sen, param_spec, ps_free_void);
1238
1239                 lex_read_unichar(0);
1240                 lex_read_space(0);
1241
1242                 while ((c = lex_peek_unichar(0)) != ')') {
1243                         int flags;
1244                         SV *name, *type;
1245                         char sigil;
1246                         PADOFFSET padoff;
1247
1248                         padoff = parse_param(aTHX_ sen, declarator, spec, param_spec, &flags, &name, init_sentinel, &type);
1249
1250                         S_intro_my(aTHX);
1251
1252                         sigil = SvPV_nolen(name)[0];
1253
1254                         /* internal consistency */
1255                         if (flags & PARAM_NAMED) {
1256                                 if (flags & PARAM_INVOCANT) {
1257                                         croak("In %"SVf": invocant %"SVf" can't be a named parameter", SVfARG(declarator), SVfARG(name));
1258                                 }
1259                                 if (sigil != '$') {
1260                                         croak("In %"SVf": named parameter %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1261                                 }
1262                         } else if (flags & PARAM_INVOCANT) {
1263                                 if (init_sentinel->op) {
1264                                         croak("In %"SVf": invocant %"SVf" can't have a default value", SVfARG(declarator), SVfARG(name));
1265                                 }
1266                                 if (sigil != '$') {
1267                                         croak("In %"SVf": invocant %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1268                                 }
1269                         } else if (sigil != '$' && init_sentinel->op) {
1270                                 croak("In %"SVf": %s %"SVf" can't have a default value", SVfARG(declarator), sigil == '@' ? "array" : "hash", SVfARG(name));
1271                         }
1272
1273                         /* external constraints */
1274                         if (param_spec->slurpy.name) {
1275                                 croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(param_spec->slurpy.name), SVfARG(name));
1276                         }
1277                         if (sigil != '$') {
1278                                 assert(!init_sentinel->op);
1279                                 param_spec->slurpy.name = name;
1280                                 param_spec->slurpy.padoff = padoff;
1281                                 param_spec->slurpy.type = type;
1282                                 continue;
1283                         }
1284
1285                         if (!(flags & PARAM_NAMED) && count_named_params(param_spec)) {
1286                                 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));
1287                         }
1288
1289                         if (flags & PARAM_INVOCANT) {
1290                                 if (param_spec->invocant.name) {
1291                                         croak("In %"SVf": invalid double invocants %"SVf", %"SVf"", SVfARG(declarator), SVfARG(param_spec->invocant.name), SVfARG(name));
1292                                 }
1293                                 if (count_positional_params(param_spec) || count_named_params(param_spec)) {
1294                                         croak("In %"SVf": invocant %"SVf" must be first in parameter list", SVfARG(declarator), SVfARG(name));
1295                                 }
1296                                 if (!(spec->flags & FLAG_INVOCANT)) {
1297                                         croak("In %"SVf": invocant %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1298                                 }
1299                                 param_spec->invocant.name = name;
1300                                 param_spec->invocant.padoff = padoff;
1301                                 param_spec->invocant.type = type;
1302                                 continue;
1303                         }
1304
1305                         if (init_sentinel->op && !(spec->flags & FLAG_DEFAULT_ARGS)) {
1306                                 croak("In %"SVf": default argument for %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1307                         }
1308
1309                         if (ps_contains(aTHX_ param_spec, name)) {
1310                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(name));
1311                         }
1312
1313                         if (flags & PARAM_NAMED) {
1314                                 if (!(spec->flags & FLAG_NAMED_PARAMS)) {
1315                                         croak("In %"SVf": named parameter :%"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1316                                 }
1317
1318                                 if (init_sentinel->op) {
1319                                         ParamInit *pi = piv_extend(&param_spec->named_optional);
1320                                         pi->param.name = name;
1321                                         pi->param.padoff = padoff;
1322                                         pi->param.type = type;
1323                                         pi->init = op_guard_transfer(init_sentinel);
1324                                         param_spec->named_optional.used++;
1325                                 } else {
1326                                         Param *p;
1327
1328                                         if (param_spec->positional_optional.used) {
1329                                                 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));
1330                                         }
1331
1332                                         p = pv_extend(&param_spec->named_required);
1333                                         p->name = name;
1334                                         p->padoff = padoff;
1335                                         p->type = type;
1336                                         param_spec->named_required.used++;
1337                                 }
1338                         } else {
1339                                 if (init_sentinel->op || param_spec->positional_optional.used) {
1340                                         ParamInit *pi = piv_extend(&param_spec->positional_optional);
1341                                         pi->param.name = name;
1342                                         pi->param.padoff = padoff;
1343                                         pi->param.type = type;
1344                                         pi->init = op_guard_transfer(init_sentinel);
1345                                         param_spec->positional_optional.used++;
1346                                 } else {
1347                                         Param *p = pv_extend(&param_spec->positional_required);
1348                                         p->name = name;
1349                                         p->padoff = padoff;
1350                                         p->type = type;
1351                                         param_spec->positional_required.used++;
1352                                 }
1353                         }
1354
1355                 }
1356                 lex_read_unichar(0);
1357                 lex_read_space(0);
1358
1359                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
1360                         if (ps_contains(aTHX_ param_spec, spec->shift)) {
1361                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(spec->shift));
1362                         }
1363
1364                         param_spec->invocant.name = spec->shift;
1365                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
1366                 }
1367         }
1368
1369         /* prototype */
1370         proto = NULL;
1371         c = lex_peek_unichar(0);
1372         if (c == ':') {
1373                 lex_read_unichar(0);
1374                 lex_read_space(0);
1375
1376                 c = lex_peek_unichar(0);
1377                 if (c != '(') {
1378                         lex_stuff_pvs(":", 0);
1379                         c = ':';
1380                 } else {
1381                         lex_read_unichar(0);
1382                         if (!(proto = my_scan_parens_tail(aTHX_ sen, FALSE))) {
1383                                 croak("In %"SVf": prototype not terminated", SVfARG(declarator));
1384                         }
1385                         my_check_prototype(aTHX_ sen, declarator, proto);
1386                         lex_read_space(0);
1387                         c = lex_peek_unichar(0);
1388                         if (!(c == ':' || c == '{')) {
1389                                 lex_stuff_pvs(":", 0);
1390                                 c = ':';
1391                         }
1392                 }
1393         }
1394
1395         /* attributes */
1396         Newx(attrs_sentinel, 1, OpGuard);
1397         op_guard_init(attrs_sentinel);
1398         sentinel_register(sen, attrs_sentinel, free_op_guard_void);
1399
1400         if (c == ':' || c == '{') /* '}' - hi, vim */ {
1401
1402                 /* kludge default attributes in */
1403                 if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
1404                         lex_stuff_sv(spec->attrs, 0);
1405                         c = ':';
1406                 }
1407
1408                 if (c == ':') {
1409                         lex_read_unichar(0);
1410                         lex_read_space(0);
1411                         c = lex_peek_unichar(0);
1412
1413                         for (;;) {
1414                                 SV *attr;
1415
1416                                 if (!(attr = my_scan_word(aTHX_ sen, FALSE))) {
1417                                         break;
1418                                 }
1419
1420                                 lex_read_space(0);
1421                                 c = lex_peek_unichar(0);
1422
1423                                 if (c != '(') {
1424                                         if (sv_eq_pvs(attr, "lvalue")) {
1425                                                 builtin_attrs |= MY_ATTR_LVALUE;
1426                                                 attr = NULL;
1427                                         } else if (sv_eq_pvs(attr, "method")) {
1428                                                 builtin_attrs |= MY_ATTR_METHOD;
1429                                                 attr = NULL;
1430                                         }
1431                                 } else {
1432                                         SV *sv;
1433                                         lex_read_unichar(0);
1434                                         if (!(sv = my_scan_parens_tail(aTHX_ sen, TRUE))) {
1435                                                 croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
1436                                         }
1437                                         sv_catpvs(attr, "(");
1438                                         sv_catsv(attr, sv);
1439                                         sv_catpvs(attr, ")");
1440
1441                                         lex_read_space(0);
1442                                         c = lex_peek_unichar(0);
1443                                 }
1444
1445                                 if (attr) {
1446                                         op_guard_update(attrs_sentinel, op_append_elem(OP_LIST, attrs_sentinel->op, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(attr))));
1447                                 }
1448
1449                                 if (c == ':') {
1450                                         lex_read_unichar(0);
1451                                         lex_read_space(0);
1452                                         c = lex_peek_unichar(0);
1453                                 }
1454                         }
1455                 }
1456         }
1457
1458         /* body */
1459         if (c != '{') /* '}' - hi, vim */ {
1460                 croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
1461         }
1462
1463         /* surprise predeclaration! */
1464         if (saw_name) {
1465                 /* 'sub NAME (PROTO);' to make name/proto known to perl before it
1466                    starts parsing the body */
1467                 const I32 sub_ix = start_subparse(FALSE, 0);
1468                 SAVEFREESV(PL_compcv);
1469
1470                 SvREFCNT_inc_simple_void(PL_compcv);
1471
1472                 newATTRSUB(
1473                         sub_ix,
1474                         mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(saw_name)),
1475                         proto ? mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(proto)) : NULL,
1476                         NULL,
1477                         NULL
1478                 );
1479         }
1480
1481         if (builtin_attrs & MY_ATTR_LVALUE) {
1482                 CvLVALUE_on(PL_compcv);
1483         }
1484         if (builtin_attrs & MY_ATTR_METHOD) {
1485                 CvMETHOD_on(PL_compcv);
1486         }
1487         if (builtin_attrs & MY_ATTR_SPECIAL) {
1488                 CvSPECIAL_on(PL_compcv);
1489         }
1490
1491         /* check number of arguments */
1492         if (spec->flags & FLAG_CHECK_NARGS) {
1493                 int amin, amax;
1494
1495                 amin = args_min(aTHX_ param_spec, spec);
1496                 if (amin > 0) {
1497                         OP *chk, *cond, *err, *xcroak;
1498
1499                         err = mkconstsv(aTHX_ newSVpvf("Not enough arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amin));
1500                         err = newBINOP(
1501                                 OP_CONCAT, 0,
1502                                 err,
1503                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1504                         );
1505                         err = newBINOP(
1506                                 OP_CONCAT, 0,
1507                                 err,
1508                                 mkconstpvs(")")
1509                         );
1510
1511                         xcroak = newCVREF(OPf_WANT_SCALAR,
1512                                           newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV)));
1513                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1514                                       op_append_elem(OP_LIST, err, xcroak));
1515
1516                         cond = newBINOP(OP_LT, 0,
1517                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1518                                         mkconstiv(aTHX_ amin));
1519                         chk = newLOGOP(OP_AND, 0, cond, err);
1520
1521                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1522                 }
1523
1524                 amax = args_max(param_spec);
1525                 if (amax >= 0) {
1526                         OP *chk, *cond, *err, *xcroak;
1527
1528                         err = mkconstsv(aTHX_ newSVpvf("Too many arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amax));
1529                         err = newBINOP(
1530                                 OP_CONCAT, 0,
1531                                 err,
1532                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1533                         );
1534                         err = newBINOP(
1535                                 OP_CONCAT, 0,
1536                                 err,
1537                                 mkconstpvs(")")
1538                         );
1539
1540                         xcroak = newCVREF(
1541                                 OPf_WANT_SCALAR,
1542                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1543                         );
1544                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1545                         op_append_elem(OP_LIST, err, xcroak));
1546
1547                         cond = newBINOP(
1548                                 OP_GT, 0,
1549                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1550                                 mkconstiv(aTHX_ amax)
1551                         );
1552                         chk = newLOGOP(OP_AND, 0, cond, err);
1553
1554                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1555                 }
1556
1557                 if (param_spec && (count_named_params(param_spec) || (param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%'))) {
1558                         OP *chk, *cond, *err, *xcroak;
1559                         const UV fixed = count_positional_params(param_spec) + !!param_spec->invocant.name;
1560
1561                         err = mkconstsv(aTHX_ newSVpvf("Odd number of paired arguments for %"SVf"", SVfARG(declarator)));
1562
1563                         xcroak = newCVREF(
1564                                 OPf_WANT_SCALAR,
1565                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1566                         );
1567                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1568                         op_append_elem(OP_LIST, err, xcroak));
1569
1570                         cond = newBINOP(OP_GT, 0,
1571                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1572                                         mkconstiv(aTHX_ fixed));
1573                         cond = newLOGOP(OP_AND, 0,
1574                                         cond,
1575                                         newBINOP(OP_MODULO, 0,
1576                                                  fixed
1577                                                  ? newBINOP(OP_SUBTRACT, 0,
1578                                                             newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1579                                                             mkconstiv(aTHX_ fixed))
1580                                                  : newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1581                                                  mkconstiv(aTHX_ 2)));
1582                         chk = newLOGOP(OP_AND, 0, cond, err);
1583
1584                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1585                 }
1586         }
1587
1588         if (!param_spec) {
1589                 /* my $invocant = shift; */
1590                 if (SvTRUE(spec->shift)) {
1591                         OP *var;
1592
1593                         var = my_var(
1594                                 aTHX_
1595                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1596                                 pad_add_name_sv(spec->shift, 0, NULL, NULL)
1597                         );
1598                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1599
1600                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1601                 }
1602         } else {
1603                 /* my $invocant = shift; */
1604                 if (param_spec->invocant.name) {
1605                         OP *var;
1606
1607                         var = my_var(
1608                                 aTHX_
1609                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1610                                 param_spec->invocant.padoff
1611                         );
1612                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1613
1614                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1615
1616                         if (param_spec->invocant.type && (spec->flags & FLAG_CHECK_TARGS)) {
1617                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, 0, &param_spec->invocant))));
1618                         }
1619                 }
1620
1621                 /* my (...) = @_; */
1622                 {
1623                         OP *lhs;
1624                         size_t i, lim;
1625
1626                         lhs = NULL;
1627
1628                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1629                                 OP *const var = my_var(
1630                                         aTHX_
1631                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1632                                         param_spec->positional_required.data[i].padoff
1633                                 );
1634                                 lhs = op_append_elem(OP_LIST, lhs, var);
1635                         }
1636
1637                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1638                                 OP *const var = my_var(
1639                                         aTHX_
1640                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1641                                         param_spec->positional_optional.data[i].param.padoff
1642                                 );
1643                                 lhs = op_append_elem(OP_LIST, lhs, var);
1644                         }
1645
1646                         {
1647                                 PADOFFSET padoff;
1648                                 I32 type;
1649                                 bool slurpy_hash;
1650
1651                                 /*
1652                                  * cases:
1653                                  *  1) no named params
1654                                  *   1.1) slurpy
1655                                  *       => put it in
1656                                  *   1.2) no slurpy
1657                                  *       => nop
1658                                  *  2) named params
1659                                  *   2.1) no slurpy
1660                                  *       => synthetic %{rest}
1661                                  *   2.2) slurpy is a hash
1662                                  *       => put it in
1663                                  *   2.3) slurpy is an array
1664                                  *       => synthetic %{rest}
1665                                  *          remember to declare array later
1666                                  */
1667
1668                                 slurpy_hash = param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%';
1669                                 if (!count_named_params(param_spec)) {
1670                                         if (param_spec->slurpy.name) {
1671                                                 padoff = param_spec->slurpy.padoff;
1672                                                 type = slurpy_hash ? OP_PADHV : OP_PADAV;
1673                                         } else {
1674                                                 padoff = NOT_IN_PAD;
1675                                                 type = OP_PADSV;
1676                                         }
1677                                 } else if (slurpy_hash) {
1678                                         padoff = param_spec->slurpy.padoff;
1679                                         type = OP_PADHV;
1680                                 } else {
1681                                         padoff = param_spec->rest_hash = pad_add_name_pvs("%{rest}", 0, NULL, NULL);
1682                                         type = OP_PADHV;
1683                                 }
1684
1685                                 if (padoff != NOT_IN_PAD) {
1686                                         OP *const var = my_var_g(
1687                                                 aTHX_
1688                                                 type,
1689                                                 OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1690                                                 padoff
1691                                         );
1692
1693                                         lhs = op_append_elem(OP_LIST, lhs, var);
1694
1695                                         if (type == OP_PADHV) {
1696                                                 param_spec->rest_hash = padoff;
1697                                         }
1698                                 }
1699                         }
1700
1701                         if (lhs) {
1702                                 OP *rhs;
1703                                 lhs->op_flags |= OPf_PARENS;
1704                                 rhs = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
1705
1706                                 op_guard_update(prelude_sentinel, op_append_list(
1707                                         OP_LINESEQ, prelude_sentinel->op,
1708                                         newSTATEOP(
1709                                                 0, NULL,
1710                                                 newASSIGNOP(OPf_STACKED, lhs, 0, rhs)
1711                                         )
1712                                 ));
1713                         }
1714                 }
1715
1716                 /* default positional arguments */
1717                 {
1718                         size_t i, lim, req;
1719                         OP *nest;
1720
1721                         nest = NULL;
1722
1723                         req = param_spec->positional_required.used;
1724                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1725                                 ParamInit *cur = &param_spec->positional_optional.data[i];
1726                                 OP *var, *cond;
1727
1728                                 cond = newBINOP(
1729                                         OP_LT, 0,
1730                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1731                                         mkconstiv(aTHX_ req + i + 1)
1732                                 );
1733
1734                                 var = my_var(aTHX_ 0, cur->param.padoff);
1735
1736                                 nest = op_append_list(
1737                                         OP_LINESEQ, nest,
1738                                         newASSIGNOP(OPf_STACKED, var, 0, op_guard_relinquish(&cur->init))
1739                                 );
1740                                 nest = newCONDOP(
1741                                         0,
1742                                         cond,
1743                                         nest,
1744                                         NULL
1745                                 );
1746                         }
1747
1748                         op_guard_update(prelude_sentinel, op_append_list(
1749                                 OP_LINESEQ, prelude_sentinel->op,
1750                                 nest
1751                         ));
1752                 }
1753
1754                 /* named parameters */
1755                 if (count_named_params(param_spec)) {
1756                         size_t i, lim;
1757
1758                         assert(param_spec->rest_hash != NOT_IN_PAD);
1759
1760                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1761                                 Param *cur = &param_spec->named_required.data[i];
1762                                 size_t n;
1763                                 char *p = SvPV(cur->name, n);
1764                                 OP *var, *cond;
1765
1766                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1767
1768                                 if (spec->flags & FLAG_CHECK_NARGS) {
1769                                         OP *xcroak, *msg;
1770
1771                                         var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1772                                         var = newUNOP(OP_DELETE, 0, var);
1773
1774                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": missing named parameter: %.*s", SVfARG(declarator), (int)(n - 1), p + 1));
1775                                         xcroak = newCVREF(
1776                                                 OPf_WANT_SCALAR,
1777                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1778                                         );
1779                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1780
1781                                         cond = newUNOP(OP_EXISTS, 0, cond);
1782
1783                                         cond = newCONDOP(0, cond, var, xcroak);
1784                                 }
1785
1786                                 var = my_var(
1787                                         aTHX_
1788                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1789                                         cur->padoff
1790                                 );
1791                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1792
1793                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1794                         }
1795
1796                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1797                                 ParamInit *cur = &param_spec->named_optional.data[i];
1798                                 size_t n;
1799                                 char *p = SvPV(cur->param.name, n);
1800                                 OP *var, *cond;
1801
1802                                 var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1803                                 var = newUNOP(OP_DELETE, 0, var);
1804
1805                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1806                                 cond = newUNOP(OP_EXISTS, 0, cond);
1807
1808                                 cond = newCONDOP(0, cond, var, op_guard_relinquish(&cur->init));
1809
1810                                 var = my_var(
1811                                         aTHX_
1812                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1813                                         cur->param.padoff
1814                                 );
1815                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1816
1817                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1818                         }
1819
1820                         if (!param_spec->slurpy.name) {
1821                                 if (spec->flags & FLAG_CHECK_NARGS) {
1822                                         /* croak if %{rest} */
1823                                         OP *xcroak, *cond, *keys, *msg;
1824
1825                                         keys = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1826                                         keys = newLISTOP(OP_SORT, 0, newOP(OP_PUSHMARK, 0), keys);
1827                                         {
1828                                                 OP *first, *mid, *last;
1829
1830                                                 last = keys;
1831
1832                                                 mid = mkconstpvs(", ");
1833                                                 mid->op_sibling = last;
1834
1835                                                 first = newOP(OP_PUSHMARK, 0);
1836
1837                                                 keys = newLISTOP(OP_JOIN, 0, first, mid);
1838                                                 keys->op_targ = pad_alloc(OP_JOIN, SVs_PADTMP);
1839                                                 ((LISTOP *)keys)->op_last = last;
1840                                         }
1841
1842                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": no such named parameter: ", SVfARG(declarator)));
1843                                         msg = newBINOP(OP_CONCAT, 0, msg, keys);
1844
1845                                         xcroak = newCVREF(
1846                                                 OPf_WANT_SCALAR,
1847                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1848                                         );
1849                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1850
1851                                         cond = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1852                                         xcroak = newCONDOP(0, cond, xcroak, NULL);
1853
1854                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, xcroak)));
1855                                 } else {
1856                                         OP *clear;
1857
1858                                         clear = newASSIGNOP(
1859                                                 OPf_STACKED,
1860                                                 my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1861                                                 0,
1862                                                 newNULLLIST()
1863                                         );
1864
1865                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, clear)));
1866                                 }
1867                         } else if (param_spec->slurpy.padoff != param_spec->rest_hash) {
1868                                 OP *var, *clear;
1869
1870                                 assert(SvPV_nolen(param_spec->slurpy.name)[0] == '@');
1871
1872                                 var = my_var_g(
1873                                         aTHX_
1874                                         OP_PADAV,
1875                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1876                                         param_spec->slurpy.padoff
1877                                 );
1878
1879                                 var = newASSIGNOP(OPf_STACKED, var, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1880
1881                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1882
1883                                 clear = newASSIGNOP(
1884                                         OPf_STACKED,
1885                                         my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1886                                         0,
1887                                         newNULLLIST()
1888                                 );
1889
1890                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, clear)));
1891                         }
1892                 }
1893
1894                 if (spec->flags & FLAG_CHECK_TARGS) {
1895                         size_t i, lim, base;
1896
1897                         base = 1;
1898                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1899                                 Param *cur = &param_spec->positional_required.data[i];
1900
1901                                 if (cur->type) {
1902                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1903                                 }
1904                         }
1905                         base += i;
1906
1907                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1908                                 Param *cur = &param_spec->positional_optional.data[i].param;
1909
1910                                 if (cur->type) {
1911                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1912                                 }
1913                         }
1914                         base += i;
1915
1916                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1917                                 Param *cur = &param_spec->named_required.data[i];
1918
1919                                 if (cur->type) {
1920                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1921                                 }
1922                         }
1923                         base += i;
1924
1925                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1926                                 Param *cur = &param_spec->named_optional.data[i].param;
1927
1928                                 if (cur->type) {
1929                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1930                                 }
1931                         }
1932                         base += i;
1933
1934                         if (param_spec->slurpy.type) {
1935                                 /* $type->valid($_) or croak $type->get_message($_) for @rest / values %rest */
1936                                 OP *check, *list, *loop;
1937
1938                                 check = mktypecheck(aTHX_ declarator, base, param_spec->slurpy.name, NOT_IN_PAD, param_spec->slurpy.type);
1939
1940                                 if (SvPV_nolen(param_spec->slurpy.name)[0] == '@') {
1941                                         list = my_var_g(aTHX_ OP_PADAV, 0, param_spec->slurpy.padoff);
1942                                 } else {
1943                                         list = my_var_g(aTHX_ OP_PADHV, 0, param_spec->slurpy.padoff);
1944                                         list = newUNOP(OP_VALUES, 0, list);
1945                                 }
1946
1947                                 loop = newFOROP(0, NULL, list, check, NULL);
1948
1949                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, loop)));
1950                         }
1951                 }
1952         }
1953
1954         /* finally let perl parse the actual subroutine body */
1955         body = parse_block(0);
1956
1957         /* add '();' to make function return nothing by default */
1958         /* (otherwise the invisible parameter initialization can "leak" into
1959            the return value: fun ($x) {}->("asdf", 0) == 2) */
1960         if (prelude_sentinel->op) {
1961                 body = newSTATEOP(0, NULL, body);
1962         }
1963
1964         body = op_append_list(OP_LINESEQ, op_guard_relinquish(prelude_sentinel), body);
1965
1966         /* it's go time. */
1967         {
1968                 CV *cv;
1969                 OP *const attrs = op_guard_relinquish(attrs_sentinel);
1970
1971                 SvREFCNT_inc_simple_void(PL_compcv);
1972
1973                 /* close outer block: '}' */
1974                 S_block_end(aTHX_ save_ix, body);
1975
1976                 cv = newATTRSUB(
1977                         floor_ix,
1978                         saw_name ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)) : NULL,
1979                         proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
1980                         attrs,
1981                         body
1982                 );
1983
1984                 if (cv) {
1985                         register_info(aTHX_ PTR2UV(CvROOT(cv)), declarator, spec, param_spec);
1986                 }
1987
1988                 if (saw_name) {
1989                         *pop = newOP(OP_NULL, 0);
1990                         return KEYWORD_PLUGIN_STMT;
1991                 }
1992
1993                 *pop = newUNOP(
1994                         OP_REFGEN, 0,
1995                         newSVOP(
1996                                 OP_ANONCODE, 0,
1997                                 (SV *)cv
1998                         )
1999                 );
2000                 return KEYWORD_PLUGIN_EXPR;
2001         }
2002 }
2003
2004 static int my_keyword_plugin(pTHX_ char *keyword_ptr, STRLEN keyword_len, OP **op_ptr) {
2005         KWSpec spec;
2006         int ret;
2007         Sentinel sen = { NULL };
2008
2009         ENTER;
2010         SAVETMPS;
2011
2012         SAVEDESTRUCTOR_X(sentinel_clear_void, sen);
2013
2014         if (kw_flags(aTHX_ sen, keyword_ptr, keyword_len, &spec)) {
2015                 ret = parse_fun(aTHX_ sen, op_ptr, keyword_ptr, keyword_len, &spec);
2016         } else {
2017                 ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
2018         }
2019
2020         FREETMPS;
2021         LEAVE;
2022
2023         return ret;
2024 }
2025
2026 WARNINGS_RESET
2027
2028 MODULE = Function::Parameters   PACKAGE = Function::Parameters   PREFIX = fp_
2029 PROTOTYPES: ENABLE
2030
2031 UV
2032 fp__cv_root(sv)
2033         SV * sv
2034         PREINIT:
2035                 CV *xcv;
2036                 HV *hv;
2037                 GV *gv;
2038         CODE:
2039                 xcv = sv_2cv(sv, &hv, &gv, 0);
2040                 RETVAL = PTR2UV(xcv ? CvROOT(xcv) : NULL);
2041         OUTPUT:
2042                 RETVAL
2043
2044 BOOT:
2045 WARNINGS_ENABLE {
2046         HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
2047         /**/
2048         newCONSTSUB(stash, "FLAG_NAME_OK",      newSViv(FLAG_NAME_OK));
2049         newCONSTSUB(stash, "FLAG_ANON_OK",      newSViv(FLAG_ANON_OK));
2050         newCONSTSUB(stash, "FLAG_DEFAULT_ARGS", newSViv(FLAG_DEFAULT_ARGS));
2051         newCONSTSUB(stash, "FLAG_CHECK_NARGS",  newSViv(FLAG_CHECK_NARGS));
2052         newCONSTSUB(stash, "FLAG_INVOCANT",     newSViv(FLAG_INVOCANT));
2053         newCONSTSUB(stash, "FLAG_NAMED_PARAMS", newSViv(FLAG_NAMED_PARAMS));
2054         newCONSTSUB(stash, "FLAG_TYPES_OK",     newSViv(FLAG_TYPES_OK));
2055         newCONSTSUB(stash, "FLAG_CHECK_TARGS",  newSViv(FLAG_CHECK_TARGS));
2056         newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
2057         newCONSTSUB(stash, "HINTK_FLAGS_",   newSVpvs(HINTK_FLAGS_));
2058         newCONSTSUB(stash, "HINTK_SHIFT_",   newSVpvs(HINTK_SHIFT_));
2059         newCONSTSUB(stash, "HINTK_ATTRS_",   newSVpvs(HINTK_ATTRS_));
2060         /**/
2061         next_keyword_plugin = PL_keyword_plugin;
2062         PL_keyword_plugin = my_keyword_plugin;
2063 } WARNINGS_RESET