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                 cur->destroy(aTHX_ cur->data);
 125                 cur->data = (void *)"no";
 126                 cur->destroy = NULL;
 127                 *pp = cur->next;
 128                 Safefree(cur);
 129         }
 130 }
 131
 132 static void sentinel_register(Sentinel sen, void *data, void (*destroy)(pTHX_ void *)) {
 133         Resource *cur;
 134
 135         Newx(cur, 1, Resource);
 136         cur->data = data;
 137         cur->destroy = destroy;
 138         cur->next = *sen;
 139         *sen = cur;
 140 }
 141
 142 static void my_sv_refcnt_dec_void(pTHX_ void *p) {
 143         SV *sv = p;
 144         SvREFCNT_dec(sv);
 145 }
 146
 147 static SV *sentinel_mortalize(Sentinel sen, SV *sv) {
 148         sentinel_register(sen, sv, my_sv_refcnt_dec_void);
 149         return sv;
 150 }
 151
 152 static void my_safefree(void *p) {
 153         Safefree(p);
 154 }
 155
 156 #define SENTINEL_ALLOC(SEN, P, N, T) STMT_START { \
 157         Newx(P, N, T); \
 158         sentinel_register(SEN, P, my_safefree); \
 159 } STMT_END
 160
 161 #define SENTINEL_MDUP(SEN, P, O, N, T) STMT_START { \
 162         void *const _sentinel_mdup_tmp_ = (P); \
 163         SENTINEL_ALLOC(SEN, P, N, T); \
 164         memcpy(P, _sentinel_mdup_tmp_, O * sizeof (T)); \
 165 } STMT_END
 166
 167 #define SENTINEL_REALLOC(SEN, P, N, T) STMT_START { \
 168         assert((N) > 0); \
 169         if (!(P)) { \
 170                 SENTINEL_ALLOC(SEN, P, N, T); \
 171         } else { \
 172                 Resource **_sentinel_realloc_tmp_ = (SEN); \
 173                 for (;;) { \
 174                         assert(*_sentinel_realloc_tmp_ != NULL); \
 175                         if ((*_sentinel_realloc_tmp_)->data == (P)) { \
 176                                 Renew((*_sentinel_realloc_tmp_)->data, N, T); \
 177                                 (P) = (*_sentinel_realloc_tmp_)->data; \
 178                                 break; \
 179                         } \
 180                         _sentinel_realloc_tmp_ = &(*_sentinel_realloc_tmp_)->next; \
 181                 } \
 182         } \
 183 } STMT_END
 184
 185 static int kw_flags(pTHX_ Sentinel sen, const char *kw_ptr, STRLEN kw_len, KWSpec *spec) {
 186         HV *hints;
 187         SV *sv, **psv;
 188         const char *p, *kw_active;
 189         STRLEN kw_active_len;
 190
 191         spec->flags = 0;
 192         spec->shift = sentinel_mortalize(sen, newSVpvs(""));
 193         spec->attrs = sentinel_mortalize(sen, newSVpvs(""));
 194
 195         if (!(hints = GvHV(PL_hintgv))) {
 196                 return FALSE;
 197         }
 198         if (!(psv = hv_fetchs(hints, HINTK_KEYWORDS, 0))) {
 199                 return FALSE;
 200         }
 201         sv = *psv;
 202         kw_active = SvPV(sv, kw_active_len);
 203         if (kw_active_len <= kw_len) {
 204                 return FALSE;
 205         }
 206         for (
 207                 p = kw_active;
 208                 (p = strchr(p, *kw_ptr)) &&
 209                 p < kw_active + kw_active_len - kw_len;
 210                 p++
 211         ) {
 212                 if (
 213                         (p == kw_active || p[-1] == ' ') &&
 214                         p[kw_len] == ' ' &&
 215                         memcmp(kw_ptr, p, kw_len) == 0
 216                 ) {
 217
 218 #define FETCH_HINTK_INTO(NAME, PTR, LEN, X) STMT_START { \
 219         const char *fk_ptr_; \
 220         STRLEN fk_len_; \
 221         SV *fk_sv_; \
 222         fk_sv_ = sentinel_mortalize(sen, newSVpvs(HINTK_ ## NAME)); \
 223         sv_catpvn(fk_sv_, PTR, LEN); \
 224         fk_ptr_ = SvPV(fk_sv_, fk_len_); \
 225         if (!((X) = hv_fetch(hints, fk_ptr_, fk_len_, 0))) { \
 226                 croak("%s: internal error: $^H{'%.*s'} not set", MY_PKG, (int)fk_len_, fk_ptr_); \
 227         } \
 228 } STMT_END
 229
 230                         FETCH_HINTK_INTO(FLAGS_, kw_ptr, kw_len, psv);
 231                         spec->flags = SvIV(*psv);
 232
 233                         FETCH_HINTK_INTO(SHIFT_, kw_ptr, kw_len, psv);
 234                         SvSetSV(spec->shift, *psv);
 235
 236                         FETCH_HINTK_INTO(ATTRS_, kw_ptr, kw_len, psv);
 237                         SvSetSV(spec->attrs, *psv);
 238
 239 #undef FETCH_HINTK_INTO
 240                         return TRUE;
 241                 }
 242         }
 243         return FALSE;
 244 }
 245
 246
 247 static void free_ptr_op_void(pTHX_ void *vp) {
 248         OP **pp = vp;
 249         op_free(*pp);
 250         Safefree(pp);
 251 }
 252
 253 static void free_op_void(pTHX_ void *vp) {
 254         OP *p = vp;
 255         op_free(p);
 256 }
 257
 258 #define sv_eq_pvs(SV, S) my_sv_eq_pvn(aTHX_ SV, "" S "", sizeof (S) - 1)
 259
 260 static int my_sv_eq_pvn(pTHX_ SV *sv, const char *p, STRLEN n) {
 261         STRLEN sv_len;
 262         const char *sv_p = SvPV(sv, sv_len);
 263         return memcmp(sv_p, p, n) == 0;
 264 }
 265
 266
 267 #include "padop_on_crack.c.inc"
 268
 269
 270 enum {
 271         MY_ATTR_LVALUE = 0x01,
 272         MY_ATTR_METHOD = 0x02,
 273         MY_ATTR_SPECIAL = 0x04
 274 };
 275
 276 static void my_sv_cat_c(pTHX_ SV *sv, U32 c) {
 277         char ds[UTF8_MAXBYTES + 1], *d;
 278         d = uvchr_to_utf8(ds, c);
 279         if (d - ds > 1) {
 280                 sv_utf8_upgrade(sv);
 281         }
 282         sv_catpvn(sv, ds, d - ds);
 283 }
 284
 285 static bool my_is_uni_xidfirst(pTHX_ UV c) {
 286         U8 tmpbuf[UTF8_MAXBYTES + 1];
 287         uvchr_to_utf8(tmpbuf, c);
 288         return is_utf8_xidfirst(tmpbuf);
 289 }
 290
 291 static bool my_is_uni_xidcont(pTHX_ UV c) {
 292         U8 tmpbuf[UTF8_MAXBYTES + 1];
 293         uvchr_to_utf8(tmpbuf, c);
 294         return is_utf8_xidcont(tmpbuf);
 295 }
 296
 297 static SV *my_scan_word(pTHX_ Sentinel sen, bool allow_package) {
 298         bool at_start, at_substart;
 299         I32 c;
 300         SV *sv = sentinel_mortalize(sen, newSVpvs(""));
 301         if (lex_bufutf8()) {
 302                 SvUTF8_on(sv);
 303         }
 304
 305         at_start = at_substart = TRUE;
 306         c = lex_peek_unichar(0);
 307
 308         while (c != -1) {
 309                 if (at_substart ? my_is_uni_xidfirst(aTHX_ c) : my_is_uni_xidcont(aTHX_ c)) {
 310                         lex_read_unichar(0);
 311                         my_sv_cat_c(aTHX_ sv, c);
 312                         at_substart = FALSE;
 313                         c = lex_peek_unichar(0);
 314                 } else if (allow_package && !at_substart && c == '\'') {
 315                         lex_read_unichar(0);
 316                         c = lex_peek_unichar(0);
 317                         if (!my_is_uni_xidfirst(aTHX_ c)) {
 318                                 lex_stuff_pvs("'", 0);
 319                                 break;
 320                         }
 321                         sv_catpvs(sv, "'");
 322                         at_substart = TRUE;
 323                 } else if (allow_package && (at_start || !at_substart) && c == ':') {
 324                         lex_read_unichar(0);
 325                         if (lex_peek_unichar(0) != ':') {
 326                                 lex_stuff_pvs(":", 0);
 327                                 break;
 328                         }
 329                         lex_read_unichar(0);
 330                         c = lex_peek_unichar(0);
 331                         if (!my_is_uni_xidfirst(aTHX_ c)) {
 332                                 lex_stuff_pvs("::", 0);
 333                                 break;
 334                         }
 335                         sv_catpvs(sv, "::");
 336                         at_substart = TRUE;
 337                 } else {
 338                         break;
 339                 }
 340                 at_start = FALSE;
 341         }
 342
 343         return SvCUR(sv) ? sv : NULL;
 344 }
 345
 346 static SV *my_scan_parens_tail(pTHX_ Sentinel sen, bool keep_backslash) {
 347         I32 c, nesting;
 348         SV *sv;
 349         line_t start;
 350
 351         start = CopLINE(PL_curcop);
 352
 353         sv = sentinel_mortalize(sen, newSVpvs(""));
 354         if (lex_bufutf8()) {
 355                 SvUTF8_on(sv);
 356         }
 357
 358         nesting = 0;
 359         for (;;) {
 360                 c = lex_read_unichar(0);
 361                 if (c == EOF) {
 362                         CopLINE_set(PL_curcop, start);
 363                         return NULL;
 364                 }
 365
 366                 if (c == '\\') {
 367                         c = lex_read_unichar(0);
 368                         if (c == EOF) {
 369                                 CopLINE_set(PL_curcop, start);
 370                                 return NULL;
 371                         }
 372                         if (keep_backslash || (c != '(' && c != ')')) {
 373                                 sv_catpvs(sv, "\\");
 374                         }
 375                 } else if (c == '(') {
 376                         nesting++;
 377                 } else if (c == ')') {
 378                         if (!nesting) {
 379                                 break;
 380                         }
 381                         nesting--;
 382                 }
 383
 384                 my_sv_cat_c(aTHX_ sv, c);
 385         }
 386
 387         return sv;
 388 }
 389
 390 static void my_check_prototype(pTHX_ Sentinel sen, const SV *declarator, SV *proto) {
 391         char *start, *r, *w, *end;
 392         STRLEN len;
 393
 394         /* strip spaces */
 395         start = SvPV(proto, len);
 396         end = start + len;
 397
 398         for (w = r = start; r < end; r++) {
 399                 if (!isSPACE(*r)) {
 400                         *w++ = *r;
 401                 }
 402         }
 403         *w = '\0';
 404         SvCUR_set(proto, w - start);
 405         end = w;
 406         len = end - start;
 407
 408         if (!ckWARN(WARN_ILLEGALPROTO)) {
 409                 return;
 410         }
 411
 412         /* check for bad characters */
 413         if (strspn(start, "$@%*;[]&\\_+") != len) {
 414                 SV *dsv = sentinel_mortalize(sen, newSVpvs(""));
 415                 warner(
 416                         packWARN(WARN_ILLEGALPROTO),
 417                         "Illegal character in prototype for %"SVf" : %s",
 418                         SVfARG(declarator),
 419                         SvUTF8(proto)
 420                                 ? sv_uni_display(
 421                                         dsv,
 422                                         proto,
 423                                         len,
 424                                         UNI_DISPLAY_ISPRINT
 425                                 )
 426                                 : pv_pretty(dsv, start, len, 60, NULL, NULL,
 427                                         PERL_PV_ESCAPE_NONASCII
 428                                 )
 429                 );
 430                 return;
 431         }
 432
 433         for (r = start; r < end; r++) {
 434                 switch (*r) {
 435                         default:
 436                                 warner(
 437                                         packWARN(WARN_ILLEGALPROTO),
 438                                         "Illegal character in prototype for %"SVf" : %s",
 439                                         SVfARG(declarator), r
 440                                 );
 441                                 return;
 442
 443                         case '_':
 444                                 if (r[1] && !strchr(";@%", *r)) {
 445                                         warner(
 446                                                 packWARN(WARN_ILLEGALPROTO),
 447                                                 "Illegal character after '_' in prototype for %"SVf" : %s",
 448                                                 SVfARG(declarator), r
 449                                         );
 450                                         return;
 451                                 }
 452                                 break;
 453
 454                         case '@':
 455                         case '%':
 456                                 if (r[1]) {
 457                                         warner(
 458                                                 packWARN(WARN_ILLEGALPROTO),
 459                                                 "prototype after '%c' for %"SVf": %s",
 460                                                 *r, SVfARG(declarator), r + 1
 461                                         );
 462                                         return;
 463                                 }
 464                                 break;
 465
 466                         case '\\':
 467                                 r++;
 468                                 if (strchr("$@%&*", *r)) {
 469                                         break;
 470                                 }
 471                                 if (*r == '[') {
 472                                         r++;
 473                                         for (; r < end && *r != ']'; r++) {
 474                                                 if (!strchr("$@%&*", *r)) {
 475                                                         break;
 476                                                 }
 477                                         }
 478                                         if (*r == ']' && r[-1] != '[') {
 479                                                 break;
 480                                         }
 481                                 }
 482                                 warner(
 483                                         packWARN(WARN_ILLEGALPROTO),
 484                                         "Illegal character after '\\' in prototype for %"SVf" : %s",
 485                                         SVfARG(declarator), r
 486                                 );
 487                                 return;
 488
 489                         case '$':
 490                         case '*':
 491                         case '&':
 492                         case ';':
 493                         case '+':
 494                                 break;
 495                 }
 496         }
 497 }
 498
 499 static SV *parse_type(pTHX_ Sentinel, const SV *);
 500
 501 static SV *parse_type_paramd(pTHX_ Sentinel sen, const SV *declarator) {
 502         I32 c;
 503         SV *t;
 504
 505         t = my_scan_word(aTHX_ sen, TRUE);
 506         lex_read_space(0);
 507
 508         c = lex_peek_unichar(0);
 509         if (c == '[') {
 510                 SV *u;
 511
 512                 lex_read_unichar(0);
 513                 lex_read_space(0);
 514                 my_sv_cat_c(aTHX_ t, c);
 515
 516                 u = parse_type(aTHX_ sen, declarator);
 517                 sv_catsv(t, u);
 518
 519                 c = lex_peek_unichar(0);
 520                 if (c != ']') {
 521                         croak("In %"SVf": missing ']' after '%"SVf"'", SVfARG(declarator), SVfARG(t));
 522                 }
 523                 lex_read_unichar(0);
 524                 lex_read_space(0);
 525
 526                 my_sv_cat_c(aTHX_ t, c);
 527         }
 528
 529         return t;
 530 }
 531
 532 static SV *parse_type(pTHX_ Sentinel sen, const SV *declarator) {
 533         I32 c;
 534         SV *t;
 535
 536         t = parse_type_paramd(aTHX_ sen, declarator);
 537
 538         c = lex_peek_unichar(0);
 539         while (c == '|') {
 540                 SV *u;
 541
 542                 lex_read_unichar(0);
 543                 lex_read_space(0);
 544
 545                 my_sv_cat_c(aTHX_ t, c);
 546                 u = parse_type_paramd(aTHX_ sen, declarator);
 547                 sv_catsv(t, u);
 548
 549                 c = lex_peek_unichar(0);
 550         }
 551
 552         return t;
 553 }
 554
 555 static SV *reify_type(pTHX_ Sentinel sen, const SV *declarator, SV *name) {
 556         SV *t;
 557         int n;
 558         dSP;
 559
 560         ENTER;
 561         SAVETMPS;
 562
 563         PUSHMARK(SP);
 564         EXTEND(SP, 1);
 565         PUSHs(name);
 566         PUTBACK;
 567
 568         n = call_pv("Moose::Util::TypeConstraints::find_or_parse_type_constraint", G_SCALAR);
 569         SPAGAIN;
 570
 571         assert(n == 1);
 572         t = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 573
 574         PUTBACK;
 575         FREETMPS;
 576         LEAVE;
 577
 578         if (!SvTRUE(t)) {
 579                 croak("In %"SVf": undefined type '%"SVf"'", SVfARG(declarator), SVfARG(name));
 580         }
 581
 582         return t;
 583 }
 584
 585
 586 DEFSTRUCT(Param) {
 587         SV *name;
 588         PADOFFSET padoff;
 589         SV *type;
 590 };
 591
 592 DEFSTRUCT(ParamInit) {
 593         Param param;
 594         OP *init;
 595 };
 596
 597 #define VEC(B) B ## _Vec
 598
 599 #define DEFVECTOR(B) DEFSTRUCT(VEC(B)) { \
 600         B (*data); \
 601         size_t used, size; \
 602 }
 603
 604 DEFVECTOR(Param);
 605 DEFVECTOR(ParamInit);
 606
 607 #define DEFVECTOR_INIT(N, B) static void N(VEC(B) *p) { \
 608         p->used = 0; \
 609         p->size = 23; \
 610         Newx(p->data, p->size, B); \
 611 } static void N(VEC(B) *)
 612
 613 DEFSTRUCT(ParamSpec) {
 614         Param invocant;
 615         VEC(Param) positional_required;
 616         VEC(ParamInit) positional_optional;
 617         VEC(Param) named_required;
 618         VEC(ParamInit) named_optional;
 619         Param slurpy;
 620         PADOFFSET rest_hash;
 621 };
 622
 623 DEFVECTOR_INIT(pv_init, Param);
 624 DEFVECTOR_INIT(piv_init, ParamInit);
 625
 626 static void p_init(Param *p) {
 627         p->name = NULL;
 628         p->padoff = NOT_IN_PAD;
 629         p->type = NULL;
 630 }
 631
 632 static void ps_init(ParamSpec *ps) {
 633         p_init(&ps->invocant);
 634         pv_init(&ps->positional_required);
 635         piv_init(&ps->positional_optional);
 636         pv_init(&ps->named_required);
 637         piv_init(&ps->named_optional);
 638         p_init(&ps->slurpy);
 639         ps->rest_hash = NOT_IN_PAD;
 640 }
 641
 642 #define DEFVECTOR_EXTEND(N, B) static B (*N(VEC(B) *p)) { \
 643         assert(p->used <= p->size); \
 644         if (p->used == p->size) { \
 645                 const size_t n = p->size / 2 * 3 + 1; \
 646                 Renew(p->data, n, B); \
 647                 p->size = n; \
 648         } \
 649         return &p->data[p->used]; \
 650 } static B (*N(VEC(B) *))
 651
 652 DEFVECTOR_EXTEND(pv_extend, Param);
 653 DEFVECTOR_EXTEND(piv_extend, ParamInit);
 654
 655 #define DEFVECTOR_CLEAR(N, B, F) static void N(pTHX_ VEC(B) *p) { \
 656         while (p->used) { \
 657                 p->used--; \
 658                 F(aTHX_ &p->data[p->used]); \
 659         } \
 660         Safefree(p->data); \
 661         p->data = NULL; \
 662         p->size = 0; \
 663 } static void N(pTHX_ VEC(B) *)
 664
 665 static void p_clear(pTHX_ Param *p) {
 666         p->name = NULL;
 667         p->padoff = NOT_IN_PAD;
 668         p->type = NULL;
 669 }
 670
 671 static void pi_clear(pTHX_ ParamInit *pi) {
 672         p_clear(aTHX_ &pi->param);
 673         if (pi->init) {
 674                 op_free(pi->init);
 675                 pi->init = NULL;
 676         }
 677 }
 678
 679 DEFVECTOR_CLEAR(pv_clear, Param, p_clear);
 680 DEFVECTOR_CLEAR(piv_clear, ParamInit, pi_clear);
 681
 682 static void ps_clear(pTHX_ ParamSpec *ps) {
 683         p_clear(aTHX_ &ps->invocant);
 684
 685         pv_clear(aTHX_ &ps->positional_required);
 686         piv_clear(aTHX_ &ps->positional_optional);
 687
 688         pv_clear(aTHX_ &ps->named_required);
 689         piv_clear(aTHX_ &ps->named_optional);
 690
 691         p_clear(aTHX_ &ps->slurpy);
 692 }
 693
 694 static int ps_contains(pTHX_ const ParamSpec *ps, SV *sv) {
 695         size_t i, lim;
 696
 697         if (ps->invocant.name && sv_eq(sv, ps->invocant.name)) {
 698                 return 1;
 699         }
 700
 701         for (i = 0, lim = ps->positional_required.used; i < lim; i++) {
 702                 if (sv_eq(sv, ps->positional_required.data[i].name)) {
 703                         return 1;
 704                 }
 705         }
 706
 707         for (i = 0, lim = ps->positional_optional.used; i < lim; i++) {
 708                 if (sv_eq(sv, ps->positional_optional.data[i].param.name)) {
 709                         return 1;
 710                 }
 711         }
 712
 713         for (i = 0, lim = ps->named_required.used; i < lim; i++) {
 714                 if (sv_eq(sv, ps->named_required.data[i].name)) {
 715                         return 1;
 716                 }
 717         }
 718
 719         for (i = 0, lim = ps->named_optional.used; i < lim; i++) {
 720                 if (sv_eq(sv, ps->named_optional.data[i].param.name)) {
 721                         return 1;
 722                 }
 723         }
 724
 725         return 0;
 726 }
 727
 728 static void ps_free_void(pTHX_ void *p) {
 729         ps_clear(aTHX_ p);
 730         Safefree(p);
 731 }
 732
 733 static int args_min(pTHX_ const ParamSpec *ps, const KWSpec *ks) {
 734         int n = 0;
 735         if (!ps) {
 736                 return SvTRUE(ks->shift) ? 1 : 0;
 737         }
 738         if (ps->invocant.name) {
 739                 n++;
 740         }
 741         n += ps->positional_required.used;
 742         n += ps->named_required.used * 2;
 743         return n;
 744 }
 745
 746 static int args_max(const ParamSpec *ps) {
 747         int n = 0;
 748         if (!ps) {
 749                 return -1;
 750         }
 751         if (ps->invocant.name) {
 752                 n++;
 753         }
 754         n += ps->positional_required.used;
 755         n += ps->positional_optional.used;
 756         if (ps->named_required.used || ps->named_optional.used || ps->slurpy.name) {
 757                 n = -1;
 758         }
 759         return n;
 760 }
 761
 762 static size_t count_positional_params(const ParamSpec *ps) {
 763         return ps->positional_required.used + ps->positional_optional.used;
 764 }
 765
 766 static size_t count_named_params(const ParamSpec *ps) {
 767         return ps->named_required.used + ps->named_optional.used;
 768 }
 769
 770 static void my_require(pTHX_ const char *file) {
 771         require_pv(file);
 772         if (SvTRUE(ERRSV)) {
 773                 croak_sv(ERRSV);
 774         }
 775 }
 776
 777 static SV *my_eval(pTHX_ Sentinel sen, I32 floor, OP *op) {
 778         SV *sv;
 779         CV *cv;
 780         dSP;
 781
 782         cv = newATTRSUB(floor, NULL, NULL, NULL, op);
 783
 784         ENTER;
 785         SAVETMPS;
 786
 787         PUSHMARK(SP);
 788         call_sv((SV *)cv, G_SCALAR | G_NOARGS);
 789         SPAGAIN;
 790         sv = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 791
 792         PUTBACK;
 793         FREETMPS;
 794         LEAVE;
 795
 796         return sv;
 797 }
 798
 799 enum {
 800         PARAM_INVOCANT = 0x01,
 801         PARAM_NAMED    = 0x02
 802 };
 803
 804 /* *pinit must be NULL on entry.
 805  * caller must free *pinit on error.
 806  */
 807 static PADOFFSET parse_param(
 808         pTHX_
 809         Sentinel sen,
 810         const SV *declarator, const KWSpec *spec, ParamSpec *param_spec,
 811         int *pflags, SV **pname, OP **pinit, SV **ptype
 812 ) {
 813         I32 c;
 814         char sigil;
 815         SV *name, *typeobj, *typename;
 816
 817         assert(!*pinit);
 818         *pflags = 0;
 819         *ptype = NULL;
 820
 821         c = lex_peek_unichar(0);
 822
 823         if (spec->flags & FLAG_TYPES_OK) {
 824                 if (c == '(') {
 825                         I32 floor;
 826                         OP *expr;
 827
 828                         lex_read_unichar(0);
 829
 830                         floor = start_subparse(FALSE, CVf_ANON);
 831
 832                         if (!(expr = parse_fullexpr(PARSE_OPTIONAL))) {
 833                                 croak("In %"SVf": invalid type expression", SVfARG(declarator));
 834                         }
 835                         sentinel_register(sen, expr, free_op_void);
 836
 837                         lex_read_space(0);
 838                         c = lex_peek_unichar(0);
 839                         if (c != ')') {
 840                                 croak("In %"SVf": missing ')' after type expression", SVfARG(declarator));
 841                         }
 842                         lex_read_unichar(0);
 843                         lex_read_space(0);
 844
 845                         *ptype = my_eval(aTHX_ sen, floor, expr);
 846                         if (!sv_isobject(*ptype)) {
 847                                 croak("In %"SVf": (%"SVf") doesn't look like a type object", SVfARG(declarator), SVfARG(*ptype));
 848                         }
 849
 850                         c = lex_peek_unichar(0);
 851                 } else if (my_is_uni_xidfirst(aTHX_ c)) {
 852                         typename = parse_type(aTHX_ sen, declarator);
 853                         my_require(aTHX_ "Moose/Util/TypeConstraints.pm");
 854                         typeobj = reify_type(aTHX_ sen, declarator, typename);
 855                         *ptype = typeobj;
 856
 857                         c = lex_peek_unichar(0);
 858                 }
 859         }
 860
 861         if (c == ':') {
 862                 lex_read_unichar(0);
 863                 lex_read_space(0);
 864
 865                 *pflags |= PARAM_NAMED;
 866
 867                 c = lex_peek_unichar(0);
 868         }
 869
 870         if (c == -1) {
 871                 croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 872         }
 873
 874         if (!(c == '$' || c == '@' || c == '%')) {
 875                 croak("In %"SVf": unexpected '%c' in parameter list (expecting a sigil)", SVfARG(declarator), (int)c);
 876         }
 877
 878         sigil = c;
 879
 880         lex_read_unichar(0);
 881         lex_read_space(0);
 882
 883         if (!(name = my_scan_word(aTHX_ sen, FALSE))) {
 884                 croak("In %"SVf": missing identifier after '%c'", SVfARG(declarator), sigil);
 885         }
 886         sv_insert(name, 0, 0, &sigil, 1);
 887         *pname = name;
 888
 889         lex_read_space(0);
 890         c = lex_peek_unichar(0);
 891
 892         if (c == '=') {
 893                 lex_read_unichar(0);
 894                 lex_read_space(0);
 895
 896
 897                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
 898                         param_spec->invocant.name = spec->shift;
 899                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
 900                 }
 901
 902                 *pinit = parse_termexpr(0);
 903
 904                 lex_read_space(0);
 905                 c = lex_peek_unichar(0);
 906         }
 907
 908         if (c == ':') {
 909                 *pflags |= PARAM_INVOCANT;
 910                 lex_read_unichar(0);
 911                 lex_read_space(0);
 912         } else if (c == ',') {
 913                 lex_read_unichar(0);
 914                 lex_read_space(0);
 915         } else if (c != ')') {
 916                 if (c == -1) {
 917                         croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 918                 }
 919                 croak("In %"SVf": unexpected '%c' in parameter list (expecting ',')", SVfARG(declarator), (int)c);
 920         }
 921
 922         return pad_add_name_sv(*pname, IF_HAVE_PERL_5_16(padadd_NO_DUP_CHECK, 0), NULL, NULL);
 923 }
 924
 925 static OP *my_var_g(pTHX_ I32 type, I32 flags, PADOFFSET padoff) {
 926         OP *var = newOP(type, flags);
 927         var->op_targ = padoff;
 928         return var;
 929 }
 930
 931 static OP *my_var(pTHX_ I32 flags, PADOFFSET padoff) {
 932         return my_var_g(aTHX_ OP_PADSV, flags, padoff);
 933 }
 934
 935 static OP *mkhvelem(pTHX_ PADOFFSET h, OP *k) {
 936         OP *hv = my_var_g(aTHX_ OP_PADHV, OPf_REF, h);
 937         return newBINOP(OP_HELEM, 0, hv, k);
 938 }
 939
 940 static OP *mkconstsv(pTHX_ SV *sv) {
 941         return newSVOP(OP_CONST, 0, sv);
 942 }
 943
 944 static OP *mkconstiv(pTHX_ IV i) {
 945         return mkconstsv(aTHX_ newSViv(i));
 946 }
 947
 948 static OP *mkconstpv(pTHX_ const char *p, size_t n) {
 949         return mkconstsv(aTHX_ newSVpv(p, n));
 950 }
 951
 952 #define mkconstpvs(S) mkconstpv(aTHX_ "" S "", sizeof S - 1)
 953
 954 static OP *mktypecheck(pTHX_ const SV *declarator, int nr, SV *name, PADOFFSET padoff, SV *type) {
 955         /* $type->check($value) or Carp::croak "...: " . $type->get_message($value) */
 956         OP *chk, *cond, *err, *msg, *xcroak;
 957
 958         err = mkconstsv(aTHX_ newSVpvf("In %"SVf": parameter %d (%"SVf"): ", SVfARG(declarator), nr, SVfARG(name)));
 959         {
 960                 OP *args = NULL;
 961
 962                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 963                 args = op_append_elem(
 964                         OP_LIST, args,
 965                         padoff == NOT_IN_PAD
 966                                 ? S_newDEFSVOP(aTHX)
 967                                 : my_var(aTHX_ 0, padoff)
 968                 );
 969                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("get_message")));
 970
 971                 msg = args;
 972                 msg->op_type = OP_ENTERSUB;
 973                 msg->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 974                 msg->op_flags |= OPf_STACKED;
 975         }
 976
 977         msg = newBINOP(OP_CONCAT, 0, err, msg);
 978
 979         xcroak = newCVREF(
 980                 OPf_WANT_SCALAR,
 981                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
 982         );
 983         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
 984
 985         {
 986                 OP *args = NULL;
 987
 988                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 989                 args = op_append_elem(
 990                         OP_LIST, args,
 991                         padoff == NOT_IN_PAD
 992                                 ? S_newDEFSVOP(aTHX)
 993                                 : my_var(aTHX_ 0, padoff)
 994                 );
 995                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("check")));
 996
 997                 chk = args;
 998                 chk->op_type = OP_ENTERSUB;
 999                 chk->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
1000                 chk->op_flags |= OPf_STACKED;
1001         }
1002
1003         chk = newLOGOP(OP_OR, 0, chk, xcroak);
1004         return chk;
1005 }
1006
1007 static OP *mktypecheckp(pTHX_ const SV *declarator, int nr, const Param *param) {
1008         return mktypecheck(aTHX_ declarator, nr, param->name, param->padoff, param->type);
1009 }
1010
1011 static void register_info(pTHX_ UV key, SV *declarator, const KWSpec *kws, const ParamSpec *ps) {
1012         dSP;
1013
1014         ENTER;
1015         SAVETMPS;
1016
1017         PUSHMARK(SP);
1018         EXTEND(SP, 10);
1019
1020         /* 0 */ {
1021                 mPUSHu(key);
1022         }
1023         /* 1 */ {
1024                 size_t n;
1025                 char *p = SvPV(declarator, n);
1026                 char *q = memchr(p, ' ', n);
1027                 mPUSHp(p, q ? q - p : n);
1028         }
1029         if (!ps) {
1030                 if (SvTRUE(kws->shift)) {
1031                         PUSHs(kws->shift);
1032                 } else {
1033                         PUSHmortal;
1034                 }
1035                 PUSHmortal;
1036                 mPUSHs(newRV_noinc((SV *)newAV()));
1037                 mPUSHs(newRV_noinc((SV *)newAV()));
1038                 mPUSHs(newRV_noinc((SV *)newAV()));
1039                 mPUSHs(newRV_noinc((SV *)newAV()));
1040                 mPUSHp("@_", 2);
1041                 PUSHmortal;
1042         } else {
1043                 /* 2, 3 */ {
1044                         if (ps->invocant.name) {
1045                                 PUSHs(ps->invocant.name);
1046                                 if (ps->invocant.type) {
1047                                         PUSHs(ps->invocant.type);
1048                                 } else {
1049                                         PUSHmortal;
1050                                 }
1051                         } else {
1052                                 PUSHmortal;
1053                                 PUSHmortal;
1054                         }
1055                 }
1056                 /* 4 */ {
1057                         size_t i, lim;
1058                         AV *av;
1059
1060                         lim = ps->positional_required.used;
1061
1062                         av = newAV();
1063                         if (lim) {
1064                                 av_extend(av, (lim - 1) * 2);
1065                                 for (i = 0; i < lim; i++) {
1066                                         Param *cur = &ps->positional_required.data[i];
1067                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1068                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1069                                 }
1070                         }
1071
1072                         mPUSHs(newRV_noinc((SV *)av));
1073                 }
1074                 /* 5 */ {
1075                         size_t i, lim;
1076                         AV *av;
1077
1078                         lim = ps->positional_optional.used;
1079
1080                         av = newAV();
1081                         if (lim) {
1082                                 av_extend(av, (lim - 1) * 2);
1083                                 for (i = 0; i < lim; i++) {
1084                                         Param *cur = &ps->positional_optional.data[i].param;
1085                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1086                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1087                                 }
1088                         }
1089
1090                         mPUSHs(newRV_noinc((SV *)av));
1091                 }
1092                 /* 6 */ {
1093                         size_t i, lim;
1094                         AV *av;
1095
1096                         lim = ps->named_required.used;
1097
1098                         av = newAV();
1099                         if (lim) {
1100                                 av_extend(av, (lim - 1) * 2);
1101                                 for (i = 0; i < lim; i++) {
1102                                         Param *cur = &ps->named_required.data[i];
1103                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1104                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1105                                 }
1106                         }
1107
1108                         mPUSHs(newRV_noinc((SV *)av));
1109                 }
1110                 /* 7 */ {
1111                         size_t i, lim;
1112                         AV *av;
1113
1114                         lim = ps->named_optional.used;
1115
1116                         av = newAV();
1117                         if (lim) {
1118                                 av_extend(av, (lim - 1) * 2);
1119                                 for (i = 0; i < lim; i++) {
1120                                         Param *cur = &ps->named_optional.data[i].param;
1121                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1122                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1123                                 }
1124                         }
1125
1126                         mPUSHs(newRV_noinc((SV *)av));
1127                 }
1128                 /* 8, 9 */ {
1129                         if (ps->slurpy.name) {
1130                                 PUSHs(ps->slurpy.name);
1131                                 if (ps->slurpy.type) {
1132                                         PUSHs(ps->slurpy.type);
1133                                 } else {
1134                                         PUSHmortal;
1135                                 }
1136                         } else {
1137                                 PUSHmortal;
1138                                 PUSHmortal;
1139                         }
1140                 }
1141         }
1142         PUTBACK;
1143
1144         call_pv(MY_PKG "::_register_info", G_VOID);
1145
1146         FREETMPS;
1147         LEAVE;
1148 }
1149
1150 static int parse_fun(pTHX_ Sentinel sen, OP **pop, const char *keyword_ptr, STRLEN keyword_len, const KWSpec *spec) {
1151         ParamSpec *param_spec;
1152         SV *declarator;
1153         I32 floor_ix;
1154         int save_ix;
1155         SV *saw_name;
1156         OP **prelude_sentinel;
1157         SV *proto;
1158         OP **attrs_sentinel, *body;
1159         unsigned builtin_attrs;
1160         I32 c;
1161
1162         declarator = sentinel_mortalize(sen, newSVpvn(keyword_ptr, keyword_len));
1163
1164         lex_read_space(0);
1165
1166         builtin_attrs = 0;
1167
1168         /* function name */
1169         saw_name = NULL;
1170         if ((spec->flags & FLAG_NAME_OK) && (saw_name = my_scan_word(aTHX_ sen, TRUE))) {
1171
1172                 if (PL_parser->expect != XSTATE) {
1173                         /* bail out early so we don't predeclare $saw_name */
1174                         croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
1175                 }
1176
1177                 sv_catpvs(declarator, " ");
1178                 sv_catsv(declarator, saw_name);
1179
1180                 if (
1181                         sv_eq_pvs(saw_name, "BEGIN") ||
1182                         sv_eq_pvs(saw_name, "END") ||
1183                         sv_eq_pvs(saw_name, "INIT") ||
1184                         sv_eq_pvs(saw_name, "CHECK") ||
1185                         sv_eq_pvs(saw_name, "UNITCHECK")
1186                 ) {
1187                         builtin_attrs |= MY_ATTR_SPECIAL;
1188                 }
1189
1190                 lex_read_space(0);
1191         } else if (!(spec->flags & FLAG_ANON_OK)) {
1192                 croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - PL_parser->bufptr), PL_parser->bufptr);
1193         } else {
1194                 sv_catpvs(declarator, " (anon)");
1195         }
1196
1197         /* we're a subroutine declaration */
1198         floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
1199         SAVEFREESV(PL_compcv);
1200
1201         /* create outer block: '{' */
1202         save_ix = S_block_start(aTHX_ TRUE);
1203
1204         /* initialize synthetic optree */
1205         Newx(prelude_sentinel, 1, OP *);
1206         *prelude_sentinel = NULL;
1207         sentinel_register(sen, prelude_sentinel, free_ptr_op_void);
1208
1209         /* parameters */
1210         param_spec = NULL;
1211
1212         c = lex_peek_unichar(0);
1213         if (c == '(') {
1214                 OP **init_sentinel;
1215
1216                 Newx(init_sentinel, 1, OP *);
1217                 *init_sentinel = NULL;
1218                 sentinel_register(sen, init_sentinel, free_ptr_op_void);
1219
1220                 Newx(param_spec, 1, ParamSpec);
1221                 ps_init(param_spec);
1222                 sentinel_register(sen, param_spec, ps_free_void);
1223
1224                 lex_read_unichar(0);
1225                 lex_read_space(0);
1226
1227                 while ((c = lex_peek_unichar(0)) != ')') {
1228                         int flags;
1229                         SV *name, *type;
1230                         char sigil;
1231                         PADOFFSET padoff;
1232
1233                         padoff = parse_param(aTHX_ sen, declarator, spec, param_spec, &flags, &name, init_sentinel, &type);
1234
1235                         S_intro_my(aTHX);
1236
1237                         sigil = SvPV_nolen(name)[0];
1238
1239                         /* internal consistency */
1240                         if (flags & PARAM_NAMED) {
1241                                 if (flags & PARAM_INVOCANT) {
1242                                         croak("In %"SVf": invocant %"SVf" can't be a named parameter", SVfARG(declarator), SVfARG(name));
1243                                 }
1244                                 if (sigil != '$') {
1245                                         croak("In %"SVf": named parameter %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1246                                 }
1247                         } else if (flags & PARAM_INVOCANT) {
1248                                 if (*init_sentinel) {
1249                                         croak("In %"SVf": invocant %"SVf" can't have a default value", SVfARG(declarator), SVfARG(name));
1250                                 }
1251                                 if (sigil != '$') {
1252                                         croak("In %"SVf": invocant %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1253                                 }
1254                         } else if (sigil != '$' && *init_sentinel) {
1255                                 croak("In %"SVf": %s %"SVf" can't have a default value", SVfARG(declarator), sigil == '@' ? "array" : "hash", SVfARG(name));
1256                         }
1257
1258                         /* external constraints */
1259                         if (param_spec->slurpy.name) {
1260                                 croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(param_spec->slurpy.name), SVfARG(name));
1261                         }
1262                         if (sigil != '$') {
1263                                 assert(!*init_sentinel);
1264                                 param_spec->slurpy.name = name;
1265                                 param_spec->slurpy.padoff = padoff;
1266                                 param_spec->slurpy.type = type;
1267                                 continue;
1268                         }
1269
1270                         if (!(flags & PARAM_NAMED) && count_named_params(param_spec)) {
1271                                 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));
1272                         }
1273
1274                         if (flags & PARAM_INVOCANT) {
1275                                 if (param_spec->invocant.name) {
1276                                         croak("In %"SVf": invalid double invocants %"SVf", %"SVf"", SVfARG(declarator), SVfARG(param_spec->invocant.name), SVfARG(name));
1277                                 }
1278                                 if (count_positional_params(param_spec) || count_named_params(param_spec)) {
1279                                         croak("In %"SVf": invocant %"SVf" must be first in parameter list", SVfARG(declarator), SVfARG(name));
1280                                 }
1281                                 if (!(spec->flags & FLAG_INVOCANT)) {
1282                                         croak("In %"SVf": invocant %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1283                                 }
1284                                 param_spec->invocant.name = name;
1285                                 param_spec->invocant.padoff = padoff;
1286                                 param_spec->invocant.type = type;
1287                                 continue;
1288                         }
1289
1290                         if (*init_sentinel && !(spec->flags & FLAG_DEFAULT_ARGS)) {
1291                                 croak("In %"SVf": default argument for %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1292                         }
1293
1294                         if (ps_contains(aTHX_ param_spec, name)) {
1295                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(name));
1296                         }
1297
1298                         if (flags & PARAM_NAMED) {
1299                                 if (!(spec->flags & FLAG_NAMED_PARAMS)) {
1300                                         croak("In %"SVf": named parameter :%"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1301                                 }
1302
1303                                 if (*init_sentinel) {
1304                                         ParamInit *pi = piv_extend(&param_spec->named_optional);
1305                                         pi->param.name = name;
1306                                         pi->param.padoff = padoff;
1307                                         pi->param.type = type;
1308                                         pi->init = *init_sentinel;
1309                                         *init_sentinel = NULL;
1310                                         param_spec->named_optional.used++;
1311                                 } else {
1312                                         if (param_spec->positional_optional.used) {
1313                                                 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));
1314                                         }
1315
1316                                         Param *p = pv_extend(&param_spec->named_required);
1317                                         p->name = name;
1318                                         p->padoff = padoff;
1319                                         p->type = type;
1320                                         param_spec->named_required.used++;
1321                                 }
1322                         } else {
1323                                 if (*init_sentinel || param_spec->positional_optional.used) {
1324                                         ParamInit *pi = piv_extend(&param_spec->positional_optional);
1325                                         pi->param.name = name;
1326                                         pi->param.padoff = padoff;
1327                                         pi->param.type = type;
1328                                         pi->init = *init_sentinel;
1329                                         *init_sentinel = NULL;
1330                                         param_spec->positional_optional.used++;
1331                                 } else {
1332                                         Param *p = pv_extend(&param_spec->positional_required);
1333                                         p->name = name;
1334                                         p->padoff = padoff;
1335                                         p->type = type;
1336                                         param_spec->positional_required.used++;
1337                                 }
1338                         }
1339
1340                 }
1341                 lex_read_unichar(0);
1342                 lex_read_space(0);
1343                 *init_sentinel = NULL;
1344
1345                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
1346                         if (ps_contains(aTHX_ param_spec, spec->shift)) {
1347                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(spec->shift));
1348                         }
1349
1350                         param_spec->invocant.name = spec->shift;
1351                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
1352                 }
1353         }
1354
1355         /* prototype */
1356         proto = NULL;
1357         c = lex_peek_unichar(0);
1358         if (c == ':') {
1359                 lex_read_unichar(0);
1360                 lex_read_space(0);
1361
1362                 c = lex_peek_unichar(0);
1363                 if (c != '(') {
1364                         lex_stuff_pvs(":", 0);
1365                         c = ':';
1366                 } else {
1367                         lex_read_unichar(0);
1368                         if (!(proto = my_scan_parens_tail(aTHX_ sen, FALSE))) {
1369                                 croak("In %"SVf": prototype not terminated", SVfARG(declarator));
1370                         }
1371                         my_check_prototype(aTHX_ sen, declarator, proto);
1372                         lex_read_space(0);
1373                         c = lex_peek_unichar(0);
1374                         if (!(c == ':' || c == '{')) {
1375                                 lex_stuff_pvs(":", 0);
1376                                 c = ':';
1377                         }
1378                 }
1379         }
1380
1381         /* attributes */
1382         Newx(attrs_sentinel, 1, OP *);
1383         *attrs_sentinel = NULL;
1384         sentinel_register(sen, attrs_sentinel, free_ptr_op_void);
1385
1386         if (c == ':' || c == '{') /* '}' - hi, vim */ {
1387
1388                 /* kludge default attributes in */
1389                 if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
1390                         lex_stuff_sv(spec->attrs, 0);
1391                         c = ':';
1392                 }
1393
1394                 if (c == ':') {
1395                         lex_read_unichar(0);
1396                         lex_read_space(0);
1397                         c = lex_peek_unichar(0);
1398
1399                         for (;;) {
1400                                 SV *attr;
1401
1402                                 if (!(attr = my_scan_word(aTHX_ sen, FALSE))) {
1403                                         break;
1404                                 }
1405
1406                                 lex_read_space(0);
1407                                 c = lex_peek_unichar(0);
1408
1409                                 if (c != '(') {
1410                                         if (sv_eq_pvs(attr, "lvalue")) {
1411                                                 builtin_attrs |= MY_ATTR_LVALUE;
1412                                                 attr = NULL;
1413                                         } else if (sv_eq_pvs(attr, "method")) {
1414                                                 builtin_attrs |= MY_ATTR_METHOD;
1415                                                 attr = NULL;
1416                                         }
1417                                 } else {
1418                                         SV *sv;
1419                                         lex_read_unichar(0);
1420                                         if (!(sv = my_scan_parens_tail(aTHX_ sen, TRUE))) {
1421                                                 croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
1422                                         }
1423                                         sv_catpvs(attr, "(");
1424                                         sv_catsv(attr, sv);
1425                                         sv_catpvs(attr, ")");
1426
1427                                         lex_read_space(0);
1428                                         c = lex_peek_unichar(0);
1429                                 }
1430
1431                                 if (attr) {
1432                                         *attrs_sentinel = op_append_elem(OP_LIST, *attrs_sentinel, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(attr)));
1433                                 }
1434
1435                                 if (c == ':') {
1436                                         lex_read_unichar(0);
1437                                         lex_read_space(0);
1438                                         c = lex_peek_unichar(0);
1439                                 }
1440                         }
1441                 }
1442         }
1443
1444         /* body */
1445         if (c != '{') /* '}' - hi, vim */ {
1446                 croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
1447         }
1448
1449         /* surprise predeclaration! */
1450         if (saw_name) {
1451                 /* 'sub NAME (PROTO);' to make name/proto known to perl before it
1452                    starts parsing the body */
1453                 const I32 sub_ix = start_subparse(FALSE, 0);
1454                 SAVEFREESV(PL_compcv);
1455
1456                 SvREFCNT_inc_simple_void(PL_compcv);
1457
1458                 newATTRSUB(
1459                         sub_ix,
1460                         mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(saw_name)),
1461                         proto ? mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(proto)) : NULL,
1462                         NULL,
1463                         NULL
1464                 );
1465         }
1466
1467         if (builtin_attrs & MY_ATTR_LVALUE) {
1468                 CvLVALUE_on(PL_compcv);
1469         }
1470         if (builtin_attrs & MY_ATTR_METHOD) {
1471                 CvMETHOD_on(PL_compcv);
1472         }
1473         if (builtin_attrs & MY_ATTR_SPECIAL) {
1474                 CvSPECIAL_on(PL_compcv);
1475         }
1476
1477         /* check number of arguments */
1478         if (spec->flags & FLAG_CHECK_NARGS) {
1479                 int amin, amax;
1480                 size_t named;
1481
1482                 amin = args_min(aTHX_ param_spec, spec);
1483                 if (amin > 0) {
1484                         OP *chk, *cond, *err, *xcroak;
1485
1486                         err = mkconstsv(aTHX_ newSVpvf("Not enough arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amin));
1487                         err = newBINOP(
1488                                 OP_CONCAT, 0,
1489                                 err,
1490                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1491                         );
1492                         err = newBINOP(
1493                                 OP_CONCAT, 0,
1494                                 err,
1495                                 mkconstpvs(")")
1496                         );
1497
1498                         xcroak = newCVREF(OPf_WANT_SCALAR,
1499                                           newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV)));
1500                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1501                                       op_append_elem(OP_LIST, err, xcroak));
1502
1503                         cond = newBINOP(OP_LT, 0,
1504                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1505                                         mkconstiv(aTHX_ amin));
1506                         chk = newLOGOP(OP_AND, 0, cond, err);
1507
1508                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1509                 }
1510
1511                 amax = args_max(param_spec);
1512                 if (amax >= 0) {
1513                         OP *chk, *cond, *err, *xcroak;
1514
1515                         err = mkconstsv(aTHX_ newSVpvf("Too many arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amax));
1516                         err = newBINOP(
1517                                 OP_CONCAT, 0,
1518                                 err,
1519                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1520                         );
1521                         err = newBINOP(
1522                                 OP_CONCAT, 0,
1523                                 err,
1524                                 mkconstpvs(")")
1525                         );
1526
1527                         xcroak = newCVREF(
1528                                 OPf_WANT_SCALAR,
1529                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1530                         );
1531                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1532                         op_append_elem(OP_LIST, err, xcroak));
1533
1534                         cond = newBINOP(
1535                                 OP_GT, 0,
1536                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1537                                 mkconstiv(aTHX_ amax)
1538                         );
1539                         chk = newLOGOP(OP_AND, 0, cond, err);
1540
1541                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1542                 }
1543
1544                 if (param_spec && (count_named_params(param_spec) || (param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%'))) {
1545                         OP *chk, *cond, *err, *xcroak;
1546                         const UV fixed = count_positional_params(param_spec) + !!param_spec->invocant.name;
1547
1548                         err = mkconstsv(aTHX_ newSVpvf("Odd number of paired arguments for %"SVf"", SVfARG(declarator)));
1549
1550                         xcroak = newCVREF(
1551                                 OPf_WANT_SCALAR,
1552                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1553                         );
1554                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1555                         op_append_elem(OP_LIST, err, xcroak));
1556
1557                         cond = newBINOP(OP_GT, 0,
1558                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1559                                         mkconstiv(aTHX_ fixed));
1560                         cond = newLOGOP(OP_AND, 0,
1561                                         cond,
1562                                         newBINOP(OP_MODULO, 0,
1563                                                  fixed
1564                                                  ? newBINOP(OP_SUBTRACT, 0,
1565                                                             newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1566                                                             mkconstiv(aTHX_ fixed))
1567                                                  : newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1568                                                  mkconstiv(aTHX_ 2)));
1569                         chk = newLOGOP(OP_AND, 0, cond, err);
1570
1571                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1572                 }
1573         }
1574
1575         if (!param_spec) {
1576                 /* my $invocant = shift; */
1577                 if (SvTRUE(spec->shift)) {
1578                         OP *var;
1579
1580                         var = my_var(
1581                                 aTHX_
1582                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1583                                 pad_add_name_sv(spec->shift, 0, NULL, NULL)
1584                         );
1585                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1586
1587                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1588                 }
1589         } else {
1590                 /* my $invocant = shift; */
1591                 if (param_spec->invocant.name) {
1592                         OP *var;
1593
1594                         var = my_var(
1595                                 aTHX_
1596                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1597                                 param_spec->invocant.padoff
1598                         );
1599                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1600
1601                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1602
1603                         if (param_spec->invocant.type && (spec->flags & FLAG_CHECK_TARGS)) {
1604                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, 0, &param_spec->invocant)));
1605                         }
1606                 }
1607
1608                 /* my (...) = @_; */
1609                 {
1610                         OP *lhs;
1611                         size_t i, lim;
1612
1613                         lhs = NULL;
1614
1615                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1616                                 OP *const var = my_var(
1617                                         aTHX_
1618                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1619                                         param_spec->positional_required.data[i].padoff
1620                                 );
1621                                 lhs = op_append_elem(OP_LIST, lhs, var);
1622                         }
1623
1624                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1625                                 OP *const var = my_var(
1626                                         aTHX_
1627                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1628                                         param_spec->positional_optional.data[i].param.padoff
1629                                 );
1630                                 lhs = op_append_elem(OP_LIST, lhs, var);
1631                         }
1632
1633                         {
1634                                 PADOFFSET padoff;
1635                                 I32 type;
1636                                 bool slurpy_hash;
1637
1638                                 /*
1639                                  * cases:
1640                                  *  1) no named params
1641                                  *   1.1) slurpy
1642                                  *       => put it in
1643                                  *   1.2) no slurpy
1644                                  *       => nop
1645                                  *  2) named params
1646                                  *   2.1) no slurpy
1647                                  *       => synthetic %{rest}
1648                                  *   2.2) slurpy is a hash
1649                                  *       => put it in
1650                                  *   2.3) slurpy is an array
1651                                  *       => synthetic %{rest}
1652                                  *          remember to declare array later
1653                                  */
1654
1655                                 slurpy_hash = param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%';
1656                                 if (!count_named_params(param_spec)) {
1657                                         if (param_spec->slurpy.name) {
1658                                                 padoff = param_spec->slurpy.padoff;
1659                                                 type = slurpy_hash ? OP_PADHV : OP_PADAV;
1660                                         } else {
1661                                                 padoff = NOT_IN_PAD;
1662                                                 type = OP_PADSV;
1663                                         }
1664                                 } else if (slurpy_hash) {
1665                                         padoff = param_spec->slurpy.padoff;
1666                                         type = OP_PADHV;
1667                                 } else {
1668                                         padoff = param_spec->rest_hash = pad_add_name_pvs("%{rest}", 0, NULL, NULL);
1669                                         type = OP_PADHV;
1670                                 }
1671
1672                                 if (padoff != NOT_IN_PAD) {
1673                                         OP *const var = my_var_g(
1674                                                 aTHX_
1675                                                 type,
1676                                                 OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1677                                                 padoff
1678                                         );
1679
1680                                         lhs = op_append_elem(OP_LIST, lhs, var);
1681
1682                                         if (type == OP_PADHV) {
1683                                                 param_spec->rest_hash = padoff;
1684                                         }
1685                                 }
1686                         }
1687
1688                         if (lhs) {
1689                                 OP *rhs;
1690                                 lhs->op_flags |= OPf_PARENS;
1691                                 rhs = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
1692
1693                                 *prelude_sentinel = op_append_list(
1694                                         OP_LINESEQ, *prelude_sentinel,
1695                                         newSTATEOP(
1696                                                 0, NULL,
1697                                                 newASSIGNOP(OPf_STACKED, lhs, 0, rhs)
1698                                         )
1699                                 );
1700                         }
1701                 }
1702
1703                 /* default positional arguments */
1704                 {
1705                         size_t i, lim, req;
1706                         OP *nest;
1707
1708                         nest = NULL;
1709
1710                         req = param_spec->positional_required.used;
1711                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1712                                 ParamInit *cur = &param_spec->positional_optional.data[i];
1713                                 OP *var, *cond;
1714
1715                                 cond = newBINOP(
1716                                         OP_LT, 0,
1717                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1718                                         mkconstiv(aTHX_ req + i + 1)
1719                                 );
1720
1721                                 var = my_var(aTHX_ 0, cur->param.padoff);
1722
1723                                 nest = op_append_list(
1724                                         OP_LINESEQ, nest,
1725                                         newASSIGNOP(OPf_STACKED, var, 0, cur->init)
1726                                 );
1727                                 cur->init = NULL;
1728                                 nest = newCONDOP(
1729                                         0,
1730                                         cond,
1731                                         nest,
1732                                         NULL
1733                                 );
1734                         }
1735
1736                         *prelude_sentinel = op_append_list(
1737                                 OP_LINESEQ, *prelude_sentinel,
1738                                 nest
1739                         );
1740                 }
1741
1742                 /* named parameters */
1743                 if (count_named_params(param_spec)) {
1744                         size_t i, lim;
1745
1746                         assert(param_spec->rest_hash != NOT_IN_PAD);
1747
1748                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1749                                 Param *cur = &param_spec->named_required.data[i];
1750                                 size_t n;
1751                                 char *p = SvPV(cur->name, n);
1752                                 OP *var, *cond;
1753
1754                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1755
1756                                 if (spec->flags & FLAG_CHECK_NARGS) {
1757                                         OP *xcroak, *msg;
1758
1759                                         var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1760                                         var = newUNOP(OP_DELETE, 0, var);
1761
1762                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": missing named parameter: %.*s", SVfARG(declarator), (int)(n - 1), p + 1));
1763                                         xcroak = newCVREF(
1764                                                 OPf_WANT_SCALAR,
1765                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1766                                         );
1767                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1768
1769                                         cond = newUNOP(OP_EXISTS, 0, cond);
1770
1771                                         cond = newCONDOP(0, cond, var, xcroak);
1772                                 }
1773
1774                                 var = my_var(
1775                                         aTHX_
1776                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1777                                         cur->padoff
1778                                 );
1779                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1780
1781                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1782                         }
1783
1784                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1785                                 ParamInit *cur = &param_spec->named_optional.data[i];
1786                                 size_t n;
1787                                 char *p = SvPV(cur->param.name, n);
1788                                 OP *var, *cond;
1789
1790                                 var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1791                                 var = newUNOP(OP_DELETE, 0, var);
1792
1793                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1794                                 cond = newUNOP(OP_EXISTS, 0, cond);
1795
1796                                 cond = newCONDOP(0, cond, var, cur->init);
1797                                 cur->init = NULL;
1798
1799                                 var = my_var(
1800                                         aTHX_
1801                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1802                                         cur->param.padoff
1803                                 );
1804                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1805
1806                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1807                         }
1808
1809                         if (!param_spec->slurpy.name) {
1810                                 if (spec->flags & FLAG_CHECK_NARGS) {
1811                                         /* croak if %{rest} */
1812                                         OP *xcroak, *cond, *keys, *msg;
1813
1814                                         keys = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1815                                         keys = newLISTOP(OP_SORT, 0, newOP(OP_PUSHMARK, 0), keys);
1816                                         {
1817                                                 OP *first, *mid, *last;
1818
1819                                                 last = keys;
1820
1821                                                 mid = mkconstpvs(", ");
1822                                                 mid->op_sibling = last;
1823
1824                                                 first = newOP(OP_PUSHMARK, 0);
1825
1826                                                 keys = newLISTOP(OP_JOIN, 0, first, mid);
1827                                                 keys->op_targ = pad_alloc(OP_JOIN, SVs_PADTMP);
1828                                                 ((LISTOP *)keys)->op_last = last;
1829                                         }
1830
1831                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": no such named parameter: ", SVfARG(declarator)));
1832                                         msg = newBINOP(OP_CONCAT, 0, msg, keys);
1833
1834                                         xcroak = newCVREF(
1835                                                 OPf_WANT_SCALAR,
1836                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1837                                         );
1838                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1839
1840                                         cond = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1841                                         xcroak = newCONDOP(0, cond, xcroak, NULL);
1842
1843                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, xcroak));
1844                                 } else {
1845                                         OP *clear;
1846
1847                                         clear = newASSIGNOP(
1848                                                 OPf_STACKED,
1849                                                 my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1850                                                 0,
1851                                                 newNULLLIST()
1852                                         );
1853
1854                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, clear));
1855                                 }
1856                         } else if (param_spec->slurpy.padoff != param_spec->rest_hash) {
1857                                 OP *var, *clear;
1858
1859                                 assert(SvPV_nolen(param_spec->slurpy.name)[0] == '@');
1860
1861                                 var = my_var_g(
1862                                         aTHX_
1863                                         OP_PADAV,
1864                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1865                                         param_spec->slurpy.padoff
1866                                 );
1867
1868                                 var = newASSIGNOP(OPf_STACKED, var, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1869
1870                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1871
1872                                 clear = newASSIGNOP(
1873                                         OPf_STACKED,
1874                                         my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1875                                         0,
1876                                         newNULLLIST()
1877                                 );
1878
1879                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, clear));
1880                         }
1881                 }
1882
1883                 if (spec->flags & FLAG_CHECK_TARGS) {
1884                         size_t i, lim, base;
1885
1886                         base = 1;
1887                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1888                                 Param *cur = &param_spec->positional_required.data[i];
1889
1890                                 if (cur->type) {
1891                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1892                                 }
1893                         }
1894                         base += i;
1895
1896                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1897                                 Param *cur = &param_spec->positional_optional.data[i].param;
1898
1899                                 if (cur->type) {
1900                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1901                                 }
1902                         }
1903                         base += i;
1904
1905                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1906                                 Param *cur = &param_spec->named_required.data[i];
1907
1908                                 if (cur->type) {
1909                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1910                                 }
1911                         }
1912                         base += i;
1913
1914                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1915                                 Param *cur = &param_spec->named_optional.data[i].param;
1916
1917                                 if (cur->type) {
1918                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1919                                 }
1920                         }
1921                         base += i;
1922
1923                         if (param_spec->slurpy.type) {
1924                                 /* $type->valid($_) or croak $type->get_message($_) for @rest / values %rest */
1925                                 OP *body, *list, *loop;
1926
1927                                 body = mktypecheck(aTHX_ declarator, base, param_spec->slurpy.name, NOT_IN_PAD, param_spec->slurpy.type);
1928
1929                                 if (SvPV_nolen(param_spec->slurpy.name)[0] == '@') {
1930                                         list = my_var_g(aTHX_ OP_PADAV, 0, param_spec->slurpy.padoff);
1931                                 } else {
1932                                         list = my_var_g(aTHX_ OP_PADHV, 0, param_spec->slurpy.padoff);
1933                                         list = newUNOP(OP_VALUES, 0, list);
1934                                 }
1935
1936                                 loop = newFOROP(0, NULL, list, body, NULL);
1937
1938                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, loop));
1939                         }
1940                 }
1941         }
1942
1943         /* finally let perl parse the actual subroutine body */
1944         body = parse_block(0);
1945
1946         /* add '();' to make function return nothing by default */
1947         /* (otherwise the invisible parameter initialization can "leak" into
1948            the return value: fun ($x) {}->("asdf", 0) == 2) */
1949         if (*prelude_sentinel) {
1950                 body = newSTATEOP(0, NULL, body);
1951         }
1952
1953         body = op_append_list(OP_LINESEQ, *prelude_sentinel, body);
1954         *prelude_sentinel = NULL;
1955
1956         /* it's go time. */
1957         {
1958                 CV *cv;
1959                 OP *const attrs = *attrs_sentinel;
1960                 *attrs_sentinel = NULL;
1961
1962                 SvREFCNT_inc_simple_void(PL_compcv);
1963
1964                 /* close outer block: '}' */
1965                 S_block_end(aTHX_ save_ix, body);
1966
1967                 cv = newATTRSUB(
1968                         floor_ix,
1969                         saw_name ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)) : NULL,
1970                         proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
1971                         attrs,
1972                         body
1973                 );
1974
1975                 register_info(aTHX_ PTR2UV(CvROOT(cv)), declarator, spec, param_spec);
1976
1977                 if (saw_name) {
1978                         *pop = newOP(OP_NULL, 0);
1979                         return KEYWORD_PLUGIN_STMT;
1980                 }
1981
1982                 *pop = newUNOP(
1983                         OP_REFGEN, 0,
1984                         newSVOP(
1985                                 OP_ANONCODE, 0,
1986                                 (SV *)cv
1987                         )
1988                 );
1989                 return KEYWORD_PLUGIN_EXPR;
1990         }
1991 }
1992
1993 static int my_keyword_plugin(pTHX_ char *keyword_ptr, STRLEN keyword_len, OP **op_ptr) {
1994         KWSpec spec;
1995         int ret;
1996         Sentinel sen = { NULL };
1997
1998         ENTER;
1999         SAVETMPS;
2000
2001         SAVEDESTRUCTOR_X(sentinel_clear_void, sen);
2002
2003         if (kw_flags(aTHX_ sen, keyword_ptr, keyword_len, &spec)) {
2004                 ret = parse_fun(aTHX_ sen, op_ptr, keyword_ptr, keyword_len, &spec);
2005         } else {
2006                 ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
2007         }
2008
2009         FREETMPS;
2010         LEAVE;
2011
2012         return ret;
2013 }
2014
2015 WARNINGS_RESET
2016
2017 MODULE = Function::Parameters   PACKAGE = Function::Parameters   PREFIX = fp_
2018 PROTOTYPES: ENABLE
2019
2020 UV
2021 fp__cv_root(sv)
2022         SV * sv
2023         PREINIT:
2024                 CV *cv;
2025                 HV *hv;
2026                 GV *gv;
2027         CODE:
2028                 cv = sv_2cv(sv, &hv, &gv, 0);
2029                 RETVAL = PTR2UV(cv ? CvROOT(cv) : NULL);
2030         OUTPUT:
2031                 RETVAL
2032
2033 BOOT:
2034 WARNINGS_ENABLE {
2035         HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
2036         /**/
2037         newCONSTSUB(stash, "FLAG_NAME_OK",      newSViv(FLAG_NAME_OK));
2038         newCONSTSUB(stash, "FLAG_ANON_OK",      newSViv(FLAG_ANON_OK));
2039         newCONSTSUB(stash, "FLAG_DEFAULT_ARGS", newSViv(FLAG_DEFAULT_ARGS));
2040         newCONSTSUB(stash, "FLAG_CHECK_NARGS",  newSViv(FLAG_CHECK_NARGS));
2041         newCONSTSUB(stash, "FLAG_INVOCANT",     newSViv(FLAG_INVOCANT));
2042         newCONSTSUB(stash, "FLAG_NAMED_PARAMS", newSViv(FLAG_NAMED_PARAMS));
2043         newCONSTSUB(stash, "FLAG_TYPES_OK",     newSViv(FLAG_TYPES_OK));
2044         newCONSTSUB(stash, "FLAG_CHECK_TARGS",  newSViv(FLAG_CHECK_TARGS));
2045         newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
2046         newCONSTSUB(stash, "HINTK_FLAGS_",   newSVpvs(HINTK_FLAGS_));
2047         newCONSTSUB(stash, "HINTK_SHIFT_",   newSVpvs(HINTK_SHIFT_));
2048         newCONSTSUB(stash, "HINTK_ATTRS_",   newSVpvs(HINTK_ATTRS_));
2049         /**/
2050         next_keyword_plugin = PL_keyword_plugin;
2051         PL_keyword_plugin = my_keyword_plugin;
2052 } WARNINGS_RESET