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 void my_safefree(void *p) {
 161         Safefree(p);
 162 }
 163
 164 #define SENTINEL_ALLOC(SEN, P, N, T) STMT_START { \
 165         Newx(P, N, T); \
 166         sentinel_register(SEN, P, my_safefree); \
 167 } STMT_END
 168
 169 #define SENTINEL_MDUP(SEN, P, O, N, T) STMT_START { \
 170         void *const _sentinel_mdup_tmp_ = (P); \
 171         SENTINEL_ALLOC(SEN, P, N, T); \
 172         memcpy(P, _sentinel_mdup_tmp_, O * sizeof (T)); \
 173 } STMT_END
 174
 175 #define SENTINEL_REALLOC(SEN, P, N, T) STMT_START { \
 176         assert((N) > 0); \
 177         if (!(P)) { \
 178                 SENTINEL_ALLOC(SEN, P, N, T); \
 179         } else { \
 180                 Resource **_sentinel_realloc_tmp_ = (SEN); \
 181                 for (;;) { \
 182                         assert(*_sentinel_realloc_tmp_ != NULL); \
 183                         if ((*_sentinel_realloc_tmp_)->data == (P)) { \
 184                                 Renew((*_sentinel_realloc_tmp_)->data, N, T); \
 185                                 (P) = (*_sentinel_realloc_tmp_)->data; \
 186                                 break; \
 187                         } \
 188                         _sentinel_realloc_tmp_ = &(*_sentinel_realloc_tmp_)->next; \
 189                 } \
 190         } \
 191 } STMT_END
 192
 193 static int kw_flags(pTHX_ Sentinel sen, const char *kw_ptr, STRLEN kw_len, KWSpec *spec) {
 194         HV *hints;
 195         SV *sv, **psv;
 196         const char *p, *kw_active;
 197         STRLEN kw_active_len;
 198
 199         spec->flags = 0;
 200         spec->shift = sentinel_mortalize(sen, newSVpvs(""));
 201         spec->attrs = sentinel_mortalize(sen, newSVpvs(""));
 202
 203         if (!(hints = GvHV(PL_hintgv))) {
 204                 return FALSE;
 205         }
 206         if (!(psv = hv_fetchs(hints, HINTK_KEYWORDS, 0))) {
 207                 return FALSE;
 208         }
 209         sv = *psv;
 210         kw_active = SvPV(sv, kw_active_len);
 211         if (kw_active_len <= kw_len) {
 212                 return FALSE;
 213         }
 214         for (
 215                 p = kw_active;
 216                 (p = strchr(p, *kw_ptr)) &&
 217                 p < kw_active + kw_active_len - kw_len;
 218                 p++
 219         ) {
 220                 if (
 221                         (p == kw_active || p[-1] == ' ') &&
 222                         p[kw_len] == ' ' &&
 223                         memcmp(kw_ptr, p, kw_len) == 0
 224                 ) {
 225
 226 #define FETCH_HINTK_INTO(NAME, PTR, LEN, X) STMT_START { \
 227         const char *fk_ptr_; \
 228         STRLEN fk_len_; \
 229         SV *fk_sv_; \
 230         fk_sv_ = sentinel_mortalize(sen, newSVpvs(HINTK_ ## NAME)); \
 231         sv_catpvn(fk_sv_, PTR, LEN); \
 232         fk_ptr_ = SvPV(fk_sv_, fk_len_); \
 233         if (!((X) = hv_fetch(hints, fk_ptr_, fk_len_, 0))) { \
 234                 croak("%s: internal error: $^H{'%.*s'} not set", MY_PKG, (int)fk_len_, fk_ptr_); \
 235         } \
 236 } STMT_END
 237
 238                         FETCH_HINTK_INTO(FLAGS_, kw_ptr, kw_len, psv);
 239                         spec->flags = SvIV(*psv);
 240
 241                         FETCH_HINTK_INTO(SHIFT_, kw_ptr, kw_len, psv);
 242                         SvSetSV(spec->shift, *psv);
 243
 244                         FETCH_HINTK_INTO(ATTRS_, kw_ptr, kw_len, psv);
 245                         SvSetSV(spec->attrs, *psv);
 246
 247 #undef FETCH_HINTK_INTO
 248                         return TRUE;
 249                 }
 250         }
 251         return FALSE;
 252 }
 253
 254
 255 static void free_ptr_op_void(pTHX_ void *vp) {
 256         OP **pp = vp;
 257         op_free(*pp);
 258         Safefree(pp);
 259 }
 260
 261 static void free_op_void(pTHX_ void *vp) {
 262         OP *p = vp;
 263         op_free(p);
 264 }
 265
 266 #define sv_eq_pvs(SV, S) my_sv_eq_pvn(aTHX_ SV, "" S "", sizeof (S) - 1)
 267
 268 static int my_sv_eq_pvn(pTHX_ SV *sv, const char *p, STRLEN n) {
 269         STRLEN sv_len;
 270         const char *sv_p = SvPV(sv, sv_len);
 271         return memcmp(sv_p, p, n) == 0;
 272 }
 273
 274
 275 #include "padop_on_crack.c.inc"
 276
 277
 278 enum {
 279         MY_ATTR_LVALUE = 0x01,
 280         MY_ATTR_METHOD = 0x02,
 281         MY_ATTR_SPECIAL = 0x04
 282 };
 283
 284 static void my_sv_cat_c(pTHX_ SV *sv, U32 c) {
 285         char ds[UTF8_MAXBYTES + 1], *d;
 286         d = (char *)uvchr_to_utf8((U8 *)ds, c);
 287         if (d - ds > 1) {
 288                 sv_utf8_upgrade(sv);
 289         }
 290         sv_catpvn(sv, ds, d - ds);
 291 }
 292
 293 static bool my_is_uni_xidfirst(pTHX_ UV c) {
 294         U8 tmpbuf[UTF8_MAXBYTES + 1];
 295         uvchr_to_utf8(tmpbuf, c);
 296         return is_utf8_xidfirst(tmpbuf);
 297 }
 298
 299 static bool my_is_uni_xidcont(pTHX_ UV c) {
 300         U8 tmpbuf[UTF8_MAXBYTES + 1];
 301         uvchr_to_utf8(tmpbuf, c);
 302         return is_utf8_xidcont(tmpbuf);
 303 }
 304
 305 static SV *my_scan_word(pTHX_ Sentinel sen, bool allow_package) {
 306         bool at_start, at_substart;
 307         I32 c;
 308         SV *sv = sentinel_mortalize(sen, newSVpvs(""));
 309         if (lex_bufutf8()) {
 310                 SvUTF8_on(sv);
 311         }
 312
 313         at_start = at_substart = TRUE;
 314         c = lex_peek_unichar(0);
 315
 316         while (c != -1) {
 317                 if (at_substart ? my_is_uni_xidfirst(aTHX_ c) : my_is_uni_xidcont(aTHX_ c)) {
 318                         lex_read_unichar(0);
 319                         my_sv_cat_c(aTHX_ sv, c);
 320                         at_substart = FALSE;
 321                         c = lex_peek_unichar(0);
 322                 } else if (allow_package && !at_substart && c == '\'') {
 323                         lex_read_unichar(0);
 324                         c = lex_peek_unichar(0);
 325                         if (!my_is_uni_xidfirst(aTHX_ c)) {
 326                                 lex_stuff_pvs("'", 0);
 327                                 break;
 328                         }
 329                         sv_catpvs(sv, "'");
 330                         at_substart = TRUE;
 331                 } else if (allow_package && (at_start || !at_substart) && c == ':') {
 332                         lex_read_unichar(0);
 333                         if (lex_peek_unichar(0) != ':') {
 334                                 lex_stuff_pvs(":", 0);
 335                                 break;
 336                         }
 337                         lex_read_unichar(0);
 338                         c = lex_peek_unichar(0);
 339                         if (!my_is_uni_xidfirst(aTHX_ c)) {
 340                                 lex_stuff_pvs("::", 0);
 341                                 break;
 342                         }
 343                         sv_catpvs(sv, "::");
 344                         at_substart = TRUE;
 345                 } else {
 346                         break;
 347                 }
 348                 at_start = FALSE;
 349         }
 350
 351         return SvCUR(sv) ? sv : NULL;
 352 }
 353
 354 static SV *my_scan_parens_tail(pTHX_ Sentinel sen, bool keep_backslash) {
 355         I32 c, nesting;
 356         SV *sv;
 357         line_t start;
 358
 359         start = CopLINE(PL_curcop);
 360
 361         sv = sentinel_mortalize(sen, newSVpvs(""));
 362         if (lex_bufutf8()) {
 363                 SvUTF8_on(sv);
 364         }
 365
 366         nesting = 0;
 367         for (;;) {
 368                 c = lex_read_unichar(0);
 369                 if (c == EOF) {
 370                         CopLINE_set(PL_curcop, start);
 371                         return NULL;
 372                 }
 373
 374                 if (c == '\\') {
 375                         c = lex_read_unichar(0);
 376                         if (c == EOF) {
 377                                 CopLINE_set(PL_curcop, start);
 378                                 return NULL;
 379                         }
 380                         if (keep_backslash || (c != '(' && c != ')')) {
 381                                 sv_catpvs(sv, "\\");
 382                         }
 383                 } else if (c == '(') {
 384                         nesting++;
 385                 } else if (c == ')') {
 386                         if (!nesting) {
 387                                 break;
 388                         }
 389                         nesting--;
 390                 }
 391
 392                 my_sv_cat_c(aTHX_ sv, c);
 393         }
 394
 395         return sv;
 396 }
 397
 398 static void my_check_prototype(pTHX_ Sentinel sen, const SV *declarator, SV *proto) {
 399         char *start, *r, *w, *end;
 400         STRLEN len;
 401
 402         /* strip spaces */
 403         start = SvPV(proto, len);
 404         end = start + len;
 405
 406         for (w = r = start; r < end; r++) {
 407                 if (!isSPACE(*r)) {
 408                         *w++ = *r;
 409                 }
 410         }
 411         *w = '\0';
 412         SvCUR_set(proto, w - start);
 413         end = w;
 414         len = end - start;
 415
 416         if (!ckWARN(WARN_ILLEGALPROTO)) {
 417                 return;
 418         }
 419
 420         /* check for bad characters */
 421         if (strspn(start, "$@%*;[]&\\_+") != len) {
 422                 SV *dsv = sentinel_mortalize(sen, newSVpvs(""));
 423                 warner(
 424                         packWARN(WARN_ILLEGALPROTO),
 425                         "Illegal character in prototype for %"SVf" : %s",
 426                         SVfARG(declarator),
 427                         SvUTF8(proto)
 428                                 ? sv_uni_display(
 429                                         dsv,
 430                                         proto,
 431                                         len,
 432                                         UNI_DISPLAY_ISPRINT
 433                                 )
 434                                 : pv_pretty(dsv, start, len, 60, NULL, NULL,
 435                                         PERL_PV_ESCAPE_NONASCII
 436                                 )
 437                 );
 438                 return;
 439         }
 440
 441         for (r = start; r < end; r++) {
 442                 switch (*r) {
 443                         default:
 444                                 warner(
 445                                         packWARN(WARN_ILLEGALPROTO),
 446                                         "Illegal character in prototype for %"SVf" : %s",
 447                                         SVfARG(declarator), r
 448                                 );
 449                                 return;
 450
 451                         case '_':
 452                                 if (r[1] && !strchr(";@%", *r)) {
 453                                         warner(
 454                                                 packWARN(WARN_ILLEGALPROTO),
 455                                                 "Illegal character after '_' in prototype for %"SVf" : %s",
 456                                                 SVfARG(declarator), r
 457                                         );
 458                                         return;
 459                                 }
 460                                 break;
 461
 462                         case '@':
 463                         case '%':
 464                                 if (r[1]) {
 465                                         warner(
 466                                                 packWARN(WARN_ILLEGALPROTO),
 467                                                 "prototype after '%c' for %"SVf": %s",
 468                                                 *r, SVfARG(declarator), r + 1
 469                                         );
 470                                         return;
 471                                 }
 472                                 break;
 473
 474                         case '\\':
 475                                 r++;
 476                                 if (strchr("$@%&*", *r)) {
 477                                         break;
 478                                 }
 479                                 if (*r == '[') {
 480                                         r++;
 481                                         for (; r < end && *r != ']'; r++) {
 482                                                 if (!strchr("$@%&*", *r)) {
 483                                                         break;
 484                                                 }
 485                                         }
 486                                         if (*r == ']' && r[-1] != '[') {
 487                                                 break;
 488                                         }
 489                                 }
 490                                 warner(
 491                                         packWARN(WARN_ILLEGALPROTO),
 492                                         "Illegal character after '\\' in prototype for %"SVf" : %s",
 493                                         SVfARG(declarator), r
 494                                 );
 495                                 return;
 496
 497                         case '$':
 498                         case '*':
 499                         case '&':
 500                         case ';':
 501                         case '+':
 502                                 break;
 503                 }
 504         }
 505 }
 506
 507 static SV *parse_type(pTHX_ Sentinel, const SV *);
 508
 509 static SV *parse_type_paramd(pTHX_ Sentinel sen, const SV *declarator) {
 510         I32 c;
 511         SV *t;
 512
 513         t = my_scan_word(aTHX_ sen, TRUE);
 514         lex_read_space(0);
 515
 516         c = lex_peek_unichar(0);
 517         if (c == '[') {
 518                 SV *u;
 519
 520                 lex_read_unichar(0);
 521                 lex_read_space(0);
 522                 my_sv_cat_c(aTHX_ t, c);
 523
 524                 u = parse_type(aTHX_ sen, declarator);
 525                 sv_catsv(t, u);
 526
 527                 c = lex_peek_unichar(0);
 528                 if (c != ']') {
 529                         croak("In %"SVf": missing ']' after '%"SVf"'", SVfARG(declarator), SVfARG(t));
 530                 }
 531                 lex_read_unichar(0);
 532                 lex_read_space(0);
 533
 534                 my_sv_cat_c(aTHX_ t, c);
 535         }
 536
 537         return t;
 538 }
 539
 540 static SV *parse_type(pTHX_ Sentinel sen, const SV *declarator) {
 541         I32 c;
 542         SV *t;
 543
 544         t = parse_type_paramd(aTHX_ sen, declarator);
 545
 546         c = lex_peek_unichar(0);
 547         while (c == '|') {
 548                 SV *u;
 549
 550                 lex_read_unichar(0);
 551                 lex_read_space(0);
 552
 553                 my_sv_cat_c(aTHX_ t, c);
 554                 u = parse_type_paramd(aTHX_ sen, declarator);
 555                 sv_catsv(t, u);
 556
 557                 c = lex_peek_unichar(0);
 558         }
 559
 560         return t;
 561 }
 562
 563 static SV *reify_type(pTHX_ Sentinel sen, const SV *declarator, SV *name) {
 564         SV *t;
 565         int n;
 566         dSP;
 567
 568         ENTER;
 569         SAVETMPS;
 570
 571         PUSHMARK(SP);
 572         EXTEND(SP, 1);
 573         PUSHs(name);
 574         PUTBACK;
 575
 576         n = call_pv("Moose::Util::TypeConstraints::find_or_parse_type_constraint", G_SCALAR);
 577         SPAGAIN;
 578
 579         assert(n == 1);
 580         /* don't warn about n being unused if assert() is compiled out */
 581         n = n;
 582
 583         t = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 584
 585         PUTBACK;
 586         FREETMPS;
 587         LEAVE;
 588
 589         if (!SvTRUE(t)) {
 590                 croak("In %"SVf": undefined type '%"SVf"'", SVfARG(declarator), SVfARG(name));
 591         }
 592
 593         return t;
 594 }
 595
 596
 597 DEFSTRUCT(Param) {
 598         SV *name;
 599         PADOFFSET padoff;
 600         SV *type;
 601 };
 602
 603 DEFSTRUCT(ParamInit) {
 604         Param param;
 605         OP *init;
 606 };
 607
 608 #define VEC(B) B ## _Vec
 609
 610 #define DEFVECTOR(B) DEFSTRUCT(VEC(B)) { \
 611         B (*data); \
 612         size_t used, size; \
 613 }
 614
 615 DEFVECTOR(Param);
 616 DEFVECTOR(ParamInit);
 617
 618 #define DEFVECTOR_INIT(N, B) static void N(VEC(B) *p) { \
 619         p->used = 0; \
 620         p->size = 23; \
 621         Newx(p->data, p->size, B); \
 622 } static void N(VEC(B) *)
 623
 624 DEFSTRUCT(ParamSpec) {
 625         Param invocant;
 626         VEC(Param) positional_required;
 627         VEC(ParamInit) positional_optional;
 628         VEC(Param) named_required;
 629         VEC(ParamInit) named_optional;
 630         Param slurpy;
 631         PADOFFSET rest_hash;
 632 };
 633
 634 DEFVECTOR_INIT(pv_init, Param);
 635 DEFVECTOR_INIT(piv_init, ParamInit);
 636
 637 static void p_init(Param *p) {
 638         p->name = NULL;
 639         p->padoff = NOT_IN_PAD;
 640         p->type = NULL;
 641 }
 642
 643 static void ps_init(ParamSpec *ps) {
 644         p_init(&ps->invocant);
 645         pv_init(&ps->positional_required);
 646         piv_init(&ps->positional_optional);
 647         pv_init(&ps->named_required);
 648         piv_init(&ps->named_optional);
 649         p_init(&ps->slurpy);
 650         ps->rest_hash = NOT_IN_PAD;
 651 }
 652
 653 #define DEFVECTOR_EXTEND(N, B) static B (*N(VEC(B) *p)) { \
 654         assert(p->used <= p->size); \
 655         if (p->used == p->size) { \
 656                 const size_t n = p->size / 2 * 3 + 1; \
 657                 Renew(p->data, n, B); \
 658                 p->size = n; \
 659         } \
 660         return &p->data[p->used]; \
 661 } static B (*N(VEC(B) *))
 662
 663 DEFVECTOR_EXTEND(pv_extend, Param);
 664 DEFVECTOR_EXTEND(piv_extend, ParamInit);
 665
 666 #define DEFVECTOR_CLEAR(N, B, F) static void N(pTHX_ VEC(B) *p) { \
 667         while (p->used) { \
 668                 p->used--; \
 669                 F(aTHX_ &p->data[p->used]); \
 670         } \
 671         Safefree(p->data); \
 672         p->data = NULL; \
 673         p->size = 0; \
 674 } static void N(pTHX_ VEC(B) *)
 675
 676 static void p_clear(pTHX_ Param *p) {
 677         p->name = NULL;
 678         p->padoff = NOT_IN_PAD;
 679         p->type = NULL;
 680 }
 681
 682 static void pi_clear(pTHX_ ParamInit *pi) {
 683         p_clear(aTHX_ &pi->param);
 684         if (pi->init) {
 685                 op_free(pi->init);
 686                 pi->init = NULL;
 687         }
 688 }
 689
 690 DEFVECTOR_CLEAR(pv_clear, Param, p_clear);
 691 DEFVECTOR_CLEAR(piv_clear, ParamInit, pi_clear);
 692
 693 static void ps_clear(pTHX_ ParamSpec *ps) {
 694         p_clear(aTHX_ &ps->invocant);
 695
 696         pv_clear(aTHX_ &ps->positional_required);
 697         piv_clear(aTHX_ &ps->positional_optional);
 698
 699         pv_clear(aTHX_ &ps->named_required);
 700         piv_clear(aTHX_ &ps->named_optional);
 701
 702         p_clear(aTHX_ &ps->slurpy);
 703 }
 704
 705 static int ps_contains(pTHX_ const ParamSpec *ps, SV *sv) {
 706         size_t i, lim;
 707
 708         if (ps->invocant.name && sv_eq(sv, ps->invocant.name)) {
 709                 return 1;
 710         }
 711
 712         for (i = 0, lim = ps->positional_required.used; i < lim; i++) {
 713                 if (sv_eq(sv, ps->positional_required.data[i].name)) {
 714                         return 1;
 715                 }
 716         }
 717
 718         for (i = 0, lim = ps->positional_optional.used; i < lim; i++) {
 719                 if (sv_eq(sv, ps->positional_optional.data[i].param.name)) {
 720                         return 1;
 721                 }
 722         }
 723
 724         for (i = 0, lim = ps->named_required.used; i < lim; i++) {
 725                 if (sv_eq(sv, ps->named_required.data[i].name)) {
 726                         return 1;
 727                 }
 728         }
 729
 730         for (i = 0, lim = ps->named_optional.used; i < lim; i++) {
 731                 if (sv_eq(sv, ps->named_optional.data[i].param.name)) {
 732                         return 1;
 733                 }
 734         }
 735
 736         return 0;
 737 }
 738
 739 static void ps_free_void(pTHX_ void *p) {
 740         ps_clear(aTHX_ p);
 741         Safefree(p);
 742 }
 743
 744 static int args_min(pTHX_ const ParamSpec *ps, const KWSpec *ks) {
 745         int n = 0;
 746         if (!ps) {
 747                 return SvTRUE(ks->shift) ? 1 : 0;
 748         }
 749         if (ps->invocant.name) {
 750                 n++;
 751         }
 752         n += ps->positional_required.used;
 753         n += ps->named_required.used * 2;
 754         return n;
 755 }
 756
 757 static int args_max(const ParamSpec *ps) {
 758         int n = 0;
 759         if (!ps) {
 760                 return -1;
 761         }
 762         if (ps->invocant.name) {
 763                 n++;
 764         }
 765         n += ps->positional_required.used;
 766         n += ps->positional_optional.used;
 767         if (ps->named_required.used || ps->named_optional.used || ps->slurpy.name) {
 768                 n = -1;
 769         }
 770         return n;
 771 }
 772
 773 static size_t count_positional_params(const ParamSpec *ps) {
 774         return ps->positional_required.used + ps->positional_optional.used;
 775 }
 776
 777 static size_t count_named_params(const ParamSpec *ps) {
 778         return ps->named_required.used + ps->named_optional.used;
 779 }
 780
 781 static void my_require(pTHX_ const char *file) {
 782         require_pv(file);
 783         if (SvTRUE(ERRSV)) {
 784                 croak_sv(ERRSV);
 785         }
 786 }
 787
 788 static SV *my_eval(pTHX_ Sentinel sen, I32 floor, OP *op) {
 789         SV *sv;
 790         CV *cv;
 791         dSP;
 792
 793         cv = newATTRSUB(floor, NULL, NULL, NULL, op);
 794
 795         ENTER;
 796         SAVETMPS;
 797
 798         PUSHMARK(SP);
 799         call_sv((SV *)cv, G_SCALAR | G_NOARGS);
 800         SPAGAIN;
 801         sv = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 802
 803         PUTBACK;
 804         FREETMPS;
 805         LEAVE;
 806
 807         return sv;
 808 }
 809
 810 enum {
 811         PARAM_INVOCANT = 0x01,
 812         PARAM_NAMED    = 0x02
 813 };
 814
 815 /* *pinit must be NULL on entry.
 816  * caller must free *pinit on error.
 817  */
 818 static PADOFFSET parse_param(
 819         pTHX_
 820         Sentinel sen,
 821         const SV *declarator, const KWSpec *spec, ParamSpec *param_spec,
 822         int *pflags, SV **pname, OP **pinit, SV **ptype
 823 ) {
 824         I32 c;
 825         char sigil;
 826         SV *name;
 827
 828         assert(!*pinit);
 829         *pflags = 0;
 830         *ptype = NULL;
 831
 832         c = lex_peek_unichar(0);
 833
 834         if (spec->flags & FLAG_TYPES_OK) {
 835                 if (c == '(') {
 836                         I32 floor;
 837                         OP *expr;
 838                         Resource *expr_sentinel;
 839
 840                         lex_read_unichar(0);
 841
 842                         floor = start_subparse(FALSE, 0);
 843                         SAVEFREESV(PL_compcv);
 844                         CvSPECIAL_on(PL_compcv);
 845
 846                         if (!(expr = parse_fullexpr(PARSE_OPTIONAL))) {
 847                                 croak("In %"SVf": invalid type expression", SVfARG(declarator));
 848                         }
 849                         expr_sentinel = sentinel_register(sen, expr, free_op_void);
 850
 851                         lex_read_space(0);
 852                         c = lex_peek_unichar(0);
 853                         if (c != ')') {
 854                                 croak("In %"SVf": missing ')' after type expression", SVfARG(declarator));
 855                         }
 856                         lex_read_unichar(0);
 857                         lex_read_space(0);
 858
 859                         SvREFCNT_inc_simple_void(PL_compcv);
 860                         sentinel_disarm(expr_sentinel);
 861                         *ptype = my_eval(aTHX_ sen, floor, expr);
 862                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 863                         if (!sv_isobject(*ptype)) {
 864                                 croak("In %"SVf": (%"SVf") doesn't look like a type object", SVfARG(declarator), SVfARG(*ptype));
 865                         }
 866
 867                         c = lex_peek_unichar(0);
 868                 } else if (my_is_uni_xidfirst(aTHX_ c)) {
 869                         *ptype = parse_type(aTHX_ sen, declarator);
 870                         my_require(aTHX_ "Moose/Util/TypeConstraints.pm");
 871                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 872
 873                         c = lex_peek_unichar(0);
 874                 }
 875         }
 876
 877         if (c == ':') {
 878                 lex_read_unichar(0);
 879                 lex_read_space(0);
 880
 881                 *pflags |= PARAM_NAMED;
 882
 883                 c = lex_peek_unichar(0);
 884         }
 885
 886         if (c == -1) {
 887                 croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 888         }
 889
 890         if (!(c == '$' || c == '@' || c == '%')) {
 891                 croak("In %"SVf": unexpected '%c' in parameter list (expecting a sigil)", SVfARG(declarator), (int)c);
 892         }
 893
 894         sigil = c;
 895
 896         lex_read_unichar(0);
 897         lex_read_space(0);
 898
 899         if (!(name = my_scan_word(aTHX_ sen, FALSE))) {
 900                 croak("In %"SVf": missing identifier after '%c'", SVfARG(declarator), sigil);
 901         }
 902         sv_insert(name, 0, 0, &sigil, 1);
 903         *pname = name;
 904
 905         lex_read_space(0);
 906         c = lex_peek_unichar(0);
 907
 908         if (c == '=') {
 909                 lex_read_unichar(0);
 910                 lex_read_space(0);
 911
 912
 913                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
 914                         param_spec->invocant.name = spec->shift;
 915                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
 916                 }
 917
 918                 *pinit = parse_termexpr(0);
 919
 920                 lex_read_space(0);
 921                 c = lex_peek_unichar(0);
 922         }
 923
 924         if (c == ':') {
 925                 *pflags |= PARAM_INVOCANT;
 926                 lex_read_unichar(0);
 927                 lex_read_space(0);
 928         } else if (c == ',') {
 929                 lex_read_unichar(0);
 930                 lex_read_space(0);
 931         } else if (c != ')') {
 932                 if (c == -1) {
 933                         croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 934                 }
 935                 croak("In %"SVf": unexpected '%c' in parameter list (expecting ',')", SVfARG(declarator), (int)c);
 936         }
 937
 938         return pad_add_name_sv(*pname, IF_HAVE_PERL_5_16(padadd_NO_DUP_CHECK, 0), NULL, NULL);
 939 }
 940
 941 static OP *my_var_g(pTHX_ I32 type, I32 flags, PADOFFSET padoff) {
 942         OP *var = newOP(type, flags);
 943         var->op_targ = padoff;
 944         return var;
 945 }
 946
 947 static OP *my_var(pTHX_ I32 flags, PADOFFSET padoff) {
 948         return my_var_g(aTHX_ OP_PADSV, flags, padoff);
 949 }
 950
 951 static OP *mkhvelem(pTHX_ PADOFFSET h, OP *k) {
 952         OP *hv = my_var_g(aTHX_ OP_PADHV, OPf_REF, h);
 953         return newBINOP(OP_HELEM, 0, hv, k);
 954 }
 955
 956 static OP *mkconstsv(pTHX_ SV *sv) {
 957         return newSVOP(OP_CONST, 0, sv);
 958 }
 959
 960 static OP *mkconstiv(pTHX_ IV i) {
 961         return mkconstsv(aTHX_ newSViv(i));
 962 }
 963
 964 static OP *mkconstpv(pTHX_ const char *p, size_t n) {
 965         return mkconstsv(aTHX_ newSVpv(p, n));
 966 }
 967
 968 #define mkconstpvs(S) mkconstpv(aTHX_ "" S "", sizeof S - 1)
 969
 970 static OP *mktypecheck(pTHX_ const SV *declarator, int nr, SV *name, PADOFFSET padoff, SV *type) {
 971         /* $type->check($value) or Carp::croak "...: " . $type->get_message($value) */
 972         OP *chk, *err, *msg, *xcroak;
 973
 974         err = mkconstsv(aTHX_ newSVpvf("In %"SVf": parameter %d (%"SVf"): ", SVfARG(declarator), nr, SVfARG(name)));
 975         {
 976                 OP *args = NULL;
 977
 978                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 979                 args = op_append_elem(
 980                         OP_LIST, args,
 981                         padoff == NOT_IN_PAD
 982                                 ? S_newDEFSVOP(aTHX)
 983                                 : my_var(aTHX_ 0, padoff)
 984                 );
 985                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("get_message")));
 986
 987                 msg = args;
 988                 msg->op_type = OP_ENTERSUB;
 989                 msg->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 990                 msg->op_flags |= OPf_STACKED;
 991         }
 992
 993         msg = newBINOP(OP_CONCAT, 0, err, msg);
 994
 995         xcroak = newCVREF(
 996                 OPf_WANT_SCALAR,
 997                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
 998         );
 999         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1000
1001         {
1002                 OP *args = NULL;
1003
1004                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
1005                 args = op_append_elem(
1006                         OP_LIST, args,
1007                         padoff == NOT_IN_PAD
1008                                 ? S_newDEFSVOP(aTHX)
1009                                 : my_var(aTHX_ 0, padoff)
1010                 );
1011                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("check")));
1012
1013                 chk = args;
1014                 chk->op_type = OP_ENTERSUB;
1015                 chk->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
1016                 chk->op_flags |= OPf_STACKED;
1017         }
1018
1019         chk = newLOGOP(OP_OR, 0, chk, xcroak);
1020         return chk;
1021 }
1022
1023 static OP *mktypecheckp(pTHX_ const SV *declarator, int nr, const Param *param) {
1024         return mktypecheck(aTHX_ declarator, nr, param->name, param->padoff, param->type);
1025 }
1026
1027 static void register_info(pTHX_ UV key, SV *declarator, const KWSpec *kws, const ParamSpec *ps) {
1028         dSP;
1029
1030         ENTER;
1031         SAVETMPS;
1032
1033         PUSHMARK(SP);
1034         EXTEND(SP, 10);
1035
1036         /* 0 */ {
1037                 mPUSHu(key);
1038         }
1039         /* 1 */ {
1040                 size_t n;
1041                 char *p = SvPV(declarator, n);
1042                 char *q = memchr(p, ' ', n);
1043                 mPUSHp(p, q ? (size_t)(q - p) : n);
1044         }
1045         if (!ps) {
1046                 if (SvTRUE(kws->shift)) {
1047                         PUSHs(kws->shift);
1048                 } else {
1049                         PUSHmortal;
1050                 }
1051                 PUSHmortal;
1052                 mPUSHs(newRV_noinc((SV *)newAV()));
1053                 mPUSHs(newRV_noinc((SV *)newAV()));
1054                 mPUSHs(newRV_noinc((SV *)newAV()));
1055                 mPUSHs(newRV_noinc((SV *)newAV()));
1056                 mPUSHp("@_", 2);
1057                 PUSHmortal;
1058         } else {
1059                 /* 2, 3 */ {
1060                         if (ps->invocant.name) {
1061                                 PUSHs(ps->invocant.name);
1062                                 if (ps->invocant.type) {
1063                                         PUSHs(ps->invocant.type);
1064                                 } else {
1065                                         PUSHmortal;
1066                                 }
1067                         } else {
1068                                 PUSHmortal;
1069                                 PUSHmortal;
1070                         }
1071                 }
1072                 /* 4 */ {
1073                         size_t i, lim;
1074                         AV *av;
1075
1076                         lim = ps->positional_required.used;
1077
1078                         av = newAV();
1079                         if (lim) {
1080                                 av_extend(av, (lim - 1) * 2);
1081                                 for (i = 0; i < lim; i++) {
1082                                         Param *cur = &ps->positional_required.data[i];
1083                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1084                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1085                                 }
1086                         }
1087
1088                         mPUSHs(newRV_noinc((SV *)av));
1089                 }
1090                 /* 5 */ {
1091                         size_t i, lim;
1092                         AV *av;
1093
1094                         lim = ps->positional_optional.used;
1095
1096                         av = newAV();
1097                         if (lim) {
1098                                 av_extend(av, (lim - 1) * 2);
1099                                 for (i = 0; i < lim; i++) {
1100                                         Param *cur = &ps->positional_optional.data[i].param;
1101                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1102                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1103                                 }
1104                         }
1105
1106                         mPUSHs(newRV_noinc((SV *)av));
1107                 }
1108                 /* 6 */ {
1109                         size_t i, lim;
1110                         AV *av;
1111
1112                         lim = ps->named_required.used;
1113
1114                         av = newAV();
1115                         if (lim) {
1116                                 av_extend(av, (lim - 1) * 2);
1117                                 for (i = 0; i < lim; i++) {
1118                                         Param *cur = &ps->named_required.data[i];
1119                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1120                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1121                                 }
1122                         }
1123
1124                         mPUSHs(newRV_noinc((SV *)av));
1125                 }
1126                 /* 7 */ {
1127                         size_t i, lim;
1128                         AV *av;
1129
1130                         lim = ps->named_optional.used;
1131
1132                         av = newAV();
1133                         if (lim) {
1134                                 av_extend(av, (lim - 1) * 2);
1135                                 for (i = 0; i < lim; i++) {
1136                                         Param *cur = &ps->named_optional.data[i].param;
1137                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1138                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1139                                 }
1140                         }
1141
1142                         mPUSHs(newRV_noinc((SV *)av));
1143                 }
1144                 /* 8, 9 */ {
1145                         if (ps->slurpy.name) {
1146                                 PUSHs(ps->slurpy.name);
1147                                 if (ps->slurpy.type) {
1148                                         PUSHs(ps->slurpy.type);
1149                                 } else {
1150                                         PUSHmortal;
1151                                 }
1152                         } else {
1153                                 PUSHmortal;
1154                                 PUSHmortal;
1155                         }
1156                 }
1157         }
1158         PUTBACK;
1159
1160         call_pv(MY_PKG "::_register_info", G_VOID);
1161
1162         FREETMPS;
1163         LEAVE;
1164 }
1165
1166 static int parse_fun(pTHX_ Sentinel sen, OP **pop, const char *keyword_ptr, STRLEN keyword_len, const KWSpec *spec) {
1167         ParamSpec *param_spec;
1168         SV *declarator;
1169         I32 floor_ix;
1170         int save_ix;
1171         SV *saw_name;
1172         OP **prelude_sentinel;
1173         SV *proto;
1174         OP **attrs_sentinel, *body;
1175         unsigned builtin_attrs;
1176         I32 c;
1177
1178         declarator = sentinel_mortalize(sen, newSVpvn(keyword_ptr, keyword_len));
1179
1180         lex_read_space(0);
1181
1182         builtin_attrs = 0;
1183
1184         /* function name */
1185         saw_name = NULL;
1186         if ((spec->flags & FLAG_NAME_OK) && (saw_name = my_scan_word(aTHX_ sen, TRUE))) {
1187
1188                 if (PL_parser->expect != XSTATE) {
1189                         /* bail out early so we don't predeclare $saw_name */
1190                         croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
1191                 }
1192
1193                 sv_catpvs(declarator, " ");
1194                 sv_catsv(declarator, saw_name);
1195
1196                 if (
1197                         sv_eq_pvs(saw_name, "BEGIN") ||
1198                         sv_eq_pvs(saw_name, "END") ||
1199                         sv_eq_pvs(saw_name, "INIT") ||
1200                         sv_eq_pvs(saw_name, "CHECK") ||
1201                         sv_eq_pvs(saw_name, "UNITCHECK")
1202                 ) {
1203                         builtin_attrs |= MY_ATTR_SPECIAL;
1204                 }
1205
1206                 lex_read_space(0);
1207         } else if (!(spec->flags & FLAG_ANON_OK)) {
1208                 croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - PL_parser->bufptr), PL_parser->bufptr);
1209         } else {
1210                 sv_catpvs(declarator, " (anon)");
1211         }
1212
1213         /* we're a subroutine declaration */
1214         floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
1215         SAVEFREESV(PL_compcv);
1216
1217         /* create outer block: '{' */
1218         save_ix = S_block_start(aTHX_ TRUE);
1219
1220         /* initialize synthetic optree */
1221         Newx(prelude_sentinel, 1, OP *);
1222         *prelude_sentinel = NULL;
1223         sentinel_register(sen, prelude_sentinel, free_ptr_op_void);
1224
1225         /* parameters */
1226         param_spec = NULL;
1227
1228         c = lex_peek_unichar(0);
1229         if (c == '(') {
1230                 OP **init_sentinel;
1231
1232                 Newx(init_sentinel, 1, OP *);
1233                 *init_sentinel = NULL;
1234                 sentinel_register(sen, init_sentinel, free_ptr_op_void);
1235
1236                 Newx(param_spec, 1, ParamSpec);
1237                 ps_init(param_spec);
1238                 sentinel_register(sen, param_spec, ps_free_void);
1239
1240                 lex_read_unichar(0);
1241                 lex_read_space(0);
1242
1243                 while ((c = lex_peek_unichar(0)) != ')') {
1244                         int flags;
1245                         SV *name, *type;
1246                         char sigil;
1247                         PADOFFSET padoff;
1248
1249                         padoff = parse_param(aTHX_ sen, declarator, spec, param_spec, &flags, &name, init_sentinel, &type);
1250
1251                         S_intro_my(aTHX);
1252
1253                         sigil = SvPV_nolen(name)[0];
1254
1255                         /* internal consistency */
1256                         if (flags & PARAM_NAMED) {
1257                                 if (flags & PARAM_INVOCANT) {
1258                                         croak("In %"SVf": invocant %"SVf" can't be a named parameter", SVfARG(declarator), SVfARG(name));
1259                                 }
1260                                 if (sigil != '$') {
1261                                         croak("In %"SVf": named parameter %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1262                                 }
1263                         } else if (flags & PARAM_INVOCANT) {
1264                                 if (*init_sentinel) {
1265                                         croak("In %"SVf": invocant %"SVf" can't have a default value", SVfARG(declarator), SVfARG(name));
1266                                 }
1267                                 if (sigil != '$') {
1268                                         croak("In %"SVf": invocant %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1269                                 }
1270                         } else if (sigil != '$' && *init_sentinel) {
1271                                 croak("In %"SVf": %s %"SVf" can't have a default value", SVfARG(declarator), sigil == '@' ? "array" : "hash", SVfARG(name));
1272                         }
1273
1274                         /* external constraints */
1275                         if (param_spec->slurpy.name) {
1276                                 croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(param_spec->slurpy.name), SVfARG(name));
1277                         }
1278                         if (sigil != '$') {
1279                                 assert(!*init_sentinel);
1280                                 param_spec->slurpy.name = name;
1281                                 param_spec->slurpy.padoff = padoff;
1282                                 param_spec->slurpy.type = type;
1283                                 continue;
1284                         }
1285
1286                         if (!(flags & PARAM_NAMED) && count_named_params(param_spec)) {
1287                                 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));
1288                         }
1289
1290                         if (flags & PARAM_INVOCANT) {
1291                                 if (param_spec->invocant.name) {
1292                                         croak("In %"SVf": invalid double invocants %"SVf", %"SVf"", SVfARG(declarator), SVfARG(param_spec->invocant.name), SVfARG(name));
1293                                 }
1294                                 if (count_positional_params(param_spec) || count_named_params(param_spec)) {
1295                                         croak("In %"SVf": invocant %"SVf" must be first in parameter list", SVfARG(declarator), SVfARG(name));
1296                                 }
1297                                 if (!(spec->flags & FLAG_INVOCANT)) {
1298                                         croak("In %"SVf": invocant %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1299                                 }
1300                                 param_spec->invocant.name = name;
1301                                 param_spec->invocant.padoff = padoff;
1302                                 param_spec->invocant.type = type;
1303                                 continue;
1304                         }
1305
1306                         if (*init_sentinel && !(spec->flags & FLAG_DEFAULT_ARGS)) {
1307                                 croak("In %"SVf": default argument for %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1308                         }
1309
1310                         if (ps_contains(aTHX_ param_spec, name)) {
1311                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(name));
1312                         }
1313
1314                         if (flags & PARAM_NAMED) {
1315                                 if (!(spec->flags & FLAG_NAMED_PARAMS)) {
1316                                         croak("In %"SVf": named parameter :%"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1317                                 }
1318
1319                                 if (*init_sentinel) {
1320                                         ParamInit *pi = piv_extend(&param_spec->named_optional);
1321                                         pi->param.name = name;
1322                                         pi->param.padoff = padoff;
1323                                         pi->param.type = type;
1324                                         pi->init = *init_sentinel;
1325                                         *init_sentinel = NULL;
1326                                         param_spec->named_optional.used++;
1327                                 } else {
1328                                         Param *p;
1329
1330                                         if (param_spec->positional_optional.used) {
1331                                                 croak("In %"SVf": can't combine optional positional (%"SVf") and required named (%"SVf") parameters", SVfARG(declarator), SVfARG(param_spec->positional_optional.data[0].param.name), SVfARG(name));
1332                                         }
1333
1334                                         p = pv_extend(&param_spec->named_required);
1335                                         p->name = name;
1336                                         p->padoff = padoff;
1337                                         p->type = type;
1338                                         param_spec->named_required.used++;
1339                                 }
1340                         } else {
1341                                 if (*init_sentinel || param_spec->positional_optional.used) {
1342                                         ParamInit *pi = piv_extend(&param_spec->positional_optional);
1343                                         pi->param.name = name;
1344                                         pi->param.padoff = padoff;
1345                                         pi->param.type = type;
1346                                         pi->init = *init_sentinel;
1347                                         *init_sentinel = NULL;
1348                                         param_spec->positional_optional.used++;
1349                                 } else {
1350                                         Param *p = pv_extend(&param_spec->positional_required);
1351                                         p->name = name;
1352                                         p->padoff = padoff;
1353                                         p->type = type;
1354                                         param_spec->positional_required.used++;
1355                                 }
1356                         }
1357
1358                 }
1359                 lex_read_unichar(0);
1360                 lex_read_space(0);
1361                 *init_sentinel = NULL;
1362
1363                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
1364                         if (ps_contains(aTHX_ param_spec, spec->shift)) {
1365                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(spec->shift));
1366                         }
1367
1368                         param_spec->invocant.name = spec->shift;
1369                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
1370                 }
1371         }
1372
1373         /* prototype */
1374         proto = NULL;
1375         c = lex_peek_unichar(0);
1376         if (c == ':') {
1377                 lex_read_unichar(0);
1378                 lex_read_space(0);
1379
1380                 c = lex_peek_unichar(0);
1381                 if (c != '(') {
1382                         lex_stuff_pvs(":", 0);
1383                         c = ':';
1384                 } else {
1385                         lex_read_unichar(0);
1386                         if (!(proto = my_scan_parens_tail(aTHX_ sen, FALSE))) {
1387                                 croak("In %"SVf": prototype not terminated", SVfARG(declarator));
1388                         }
1389                         my_check_prototype(aTHX_ sen, declarator, proto);
1390                         lex_read_space(0);
1391                         c = lex_peek_unichar(0);
1392                         if (!(c == ':' || c == '{')) {
1393                                 lex_stuff_pvs(":", 0);
1394                                 c = ':';
1395                         }
1396                 }
1397         }
1398
1399         /* attributes */
1400         Newx(attrs_sentinel, 1, OP *);
1401         *attrs_sentinel = NULL;
1402         sentinel_register(sen, attrs_sentinel, free_ptr_op_void);
1403
1404         if (c == ':' || c == '{') /* '}' - hi, vim */ {
1405
1406                 /* kludge default attributes in */
1407                 if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
1408                         lex_stuff_sv(spec->attrs, 0);
1409                         c = ':';
1410                 }
1411
1412                 if (c == ':') {
1413                         lex_read_unichar(0);
1414                         lex_read_space(0);
1415                         c = lex_peek_unichar(0);
1416
1417                         for (;;) {
1418                                 SV *attr;
1419
1420                                 if (!(attr = my_scan_word(aTHX_ sen, FALSE))) {
1421                                         break;
1422                                 }
1423
1424                                 lex_read_space(0);
1425                                 c = lex_peek_unichar(0);
1426
1427                                 if (c != '(') {
1428                                         if (sv_eq_pvs(attr, "lvalue")) {
1429                                                 builtin_attrs |= MY_ATTR_LVALUE;
1430                                                 attr = NULL;
1431                                         } else if (sv_eq_pvs(attr, "method")) {
1432                                                 builtin_attrs |= MY_ATTR_METHOD;
1433                                                 attr = NULL;
1434                                         }
1435                                 } else {
1436                                         SV *sv;
1437                                         lex_read_unichar(0);
1438                                         if (!(sv = my_scan_parens_tail(aTHX_ sen, TRUE))) {
1439                                                 croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
1440                                         }
1441                                         sv_catpvs(attr, "(");
1442                                         sv_catsv(attr, sv);
1443                                         sv_catpvs(attr, ")");
1444
1445                                         lex_read_space(0);
1446                                         c = lex_peek_unichar(0);
1447                                 }
1448
1449                                 if (attr) {
1450                                         *attrs_sentinel = op_append_elem(OP_LIST, *attrs_sentinel, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(attr)));
1451                                 }
1452
1453                                 if (c == ':') {
1454                                         lex_read_unichar(0);
1455                                         lex_read_space(0);
1456                                         c = lex_peek_unichar(0);
1457                                 }
1458                         }
1459                 }
1460         }
1461
1462         /* body */
1463         if (c != '{') /* '}' - hi, vim */ {
1464                 croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
1465         }
1466
1467         /* surprise predeclaration! */
1468         if (saw_name) {
1469                 /* 'sub NAME (PROTO);' to make name/proto known to perl before it
1470                    starts parsing the body */
1471                 const I32 sub_ix = start_subparse(FALSE, 0);
1472                 SAVEFREESV(PL_compcv);
1473
1474                 SvREFCNT_inc_simple_void(PL_compcv);
1475
1476                 newATTRSUB(
1477                         sub_ix,
1478                         mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(saw_name)),
1479                         proto ? mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(proto)) : NULL,
1480                         NULL,
1481                         NULL
1482                 );
1483         }
1484
1485         if (builtin_attrs & MY_ATTR_LVALUE) {
1486                 CvLVALUE_on(PL_compcv);
1487         }
1488         if (builtin_attrs & MY_ATTR_METHOD) {
1489                 CvMETHOD_on(PL_compcv);
1490         }
1491         if (builtin_attrs & MY_ATTR_SPECIAL) {
1492                 CvSPECIAL_on(PL_compcv);
1493         }
1494
1495         /* check number of arguments */
1496         if (spec->flags & FLAG_CHECK_NARGS) {
1497                 int amin, amax;
1498
1499                 amin = args_min(aTHX_ param_spec, spec);
1500                 if (amin > 0) {
1501                         OP *chk, *cond, *err, *xcroak;
1502
1503                         err = mkconstsv(aTHX_ newSVpvf("Not enough arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amin));
1504                         err = newBINOP(
1505                                 OP_CONCAT, 0,
1506                                 err,
1507                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1508                         );
1509                         err = newBINOP(
1510                                 OP_CONCAT, 0,
1511                                 err,
1512                                 mkconstpvs(")")
1513                         );
1514
1515                         xcroak = newCVREF(OPf_WANT_SCALAR,
1516                                           newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV)));
1517                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1518                                       op_append_elem(OP_LIST, err, xcroak));
1519
1520                         cond = newBINOP(OP_LT, 0,
1521                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1522                                         mkconstiv(aTHX_ amin));
1523                         chk = newLOGOP(OP_AND, 0, cond, err);
1524
1525                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1526                 }
1527
1528                 amax = args_max(param_spec);
1529                 if (amax >= 0) {
1530                         OP *chk, *cond, *err, *xcroak;
1531
1532                         err = mkconstsv(aTHX_ newSVpvf("Too many arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amax));
1533                         err = newBINOP(
1534                                 OP_CONCAT, 0,
1535                                 err,
1536                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1537                         );
1538                         err = newBINOP(
1539                                 OP_CONCAT, 0,
1540                                 err,
1541                                 mkconstpvs(")")
1542                         );
1543
1544                         xcroak = newCVREF(
1545                                 OPf_WANT_SCALAR,
1546                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1547                         );
1548                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1549                         op_append_elem(OP_LIST, err, xcroak));
1550
1551                         cond = newBINOP(
1552                                 OP_GT, 0,
1553                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1554                                 mkconstiv(aTHX_ amax)
1555                         );
1556                         chk = newLOGOP(OP_AND, 0, cond, err);
1557
1558                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1559                 }
1560
1561                 if (param_spec && (count_named_params(param_spec) || (param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%'))) {
1562                         OP *chk, *cond, *err, *xcroak;
1563                         const UV fixed = count_positional_params(param_spec) + !!param_spec->invocant.name;
1564
1565                         err = mkconstsv(aTHX_ newSVpvf("Odd number of paired arguments for %"SVf"", SVfARG(declarator)));
1566
1567                         xcroak = newCVREF(
1568                                 OPf_WANT_SCALAR,
1569                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1570                         );
1571                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1572                         op_append_elem(OP_LIST, err, xcroak));
1573
1574                         cond = newBINOP(OP_GT, 0,
1575                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1576                                         mkconstiv(aTHX_ fixed));
1577                         cond = newLOGOP(OP_AND, 0,
1578                                         cond,
1579                                         newBINOP(OP_MODULO, 0,
1580                                                  fixed
1581                                                  ? newBINOP(OP_SUBTRACT, 0,
1582                                                             newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1583                                                             mkconstiv(aTHX_ fixed))
1584                                                  : newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1585                                                  mkconstiv(aTHX_ 2)));
1586                         chk = newLOGOP(OP_AND, 0, cond, err);
1587
1588                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1589                 }
1590         }
1591
1592         if (!param_spec) {
1593                 /* my $invocant = shift; */
1594                 if (SvTRUE(spec->shift)) {
1595                         OP *var;
1596
1597                         var = my_var(
1598                                 aTHX_
1599                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1600                                 pad_add_name_sv(spec->shift, 0, NULL, NULL)
1601                         );
1602                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1603
1604                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1605                 }
1606         } else {
1607                 /* my $invocant = shift; */
1608                 if (param_spec->invocant.name) {
1609                         OP *var;
1610
1611                         var = my_var(
1612                                 aTHX_
1613                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1614                                 param_spec->invocant.padoff
1615                         );
1616                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1617
1618                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1619
1620                         if (param_spec->invocant.type && (spec->flags & FLAG_CHECK_TARGS)) {
1621                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, 0, &param_spec->invocant)));
1622                         }
1623                 }
1624
1625                 /* my (...) = @_; */
1626                 {
1627                         OP *lhs;
1628                         size_t i, lim;
1629
1630                         lhs = NULL;
1631
1632                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1633                                 OP *const var = my_var(
1634                                         aTHX_
1635                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1636                                         param_spec->positional_required.data[i].padoff
1637                                 );
1638                                 lhs = op_append_elem(OP_LIST, lhs, var);
1639                         }
1640
1641                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1642                                 OP *const var = my_var(
1643                                         aTHX_
1644                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1645                                         param_spec->positional_optional.data[i].param.padoff
1646                                 );
1647                                 lhs = op_append_elem(OP_LIST, lhs, var);
1648                         }
1649
1650                         {
1651                                 PADOFFSET padoff;
1652                                 I32 type;
1653                                 bool slurpy_hash;
1654
1655                                 /*
1656                                  * cases:
1657                                  *  1) no named params
1658                                  *   1.1) slurpy
1659                                  *       => put it in
1660                                  *   1.2) no slurpy
1661                                  *       => nop
1662                                  *  2) named params
1663                                  *   2.1) no slurpy
1664                                  *       => synthetic %{rest}
1665                                  *   2.2) slurpy is a hash
1666                                  *       => put it in
1667                                  *   2.3) slurpy is an array
1668                                  *       => synthetic %{rest}
1669                                  *          remember to declare array later
1670                                  */
1671
1672                                 slurpy_hash = param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%';
1673                                 if (!count_named_params(param_spec)) {
1674                                         if (param_spec->slurpy.name) {
1675                                                 padoff = param_spec->slurpy.padoff;
1676                                                 type = slurpy_hash ? OP_PADHV : OP_PADAV;
1677                                         } else {
1678                                                 padoff = NOT_IN_PAD;
1679                                                 type = OP_PADSV;
1680                                         }
1681                                 } else if (slurpy_hash) {
1682                                         padoff = param_spec->slurpy.padoff;
1683                                         type = OP_PADHV;
1684                                 } else {
1685                                         padoff = param_spec->rest_hash = pad_add_name_pvs("%{rest}", 0, NULL, NULL);
1686                                         type = OP_PADHV;
1687                                 }
1688
1689                                 if (padoff != NOT_IN_PAD) {
1690                                         OP *const var = my_var_g(
1691                                                 aTHX_
1692                                                 type,
1693                                                 OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1694                                                 padoff
1695                                         );
1696
1697                                         lhs = op_append_elem(OP_LIST, lhs, var);
1698
1699                                         if (type == OP_PADHV) {
1700                                                 param_spec->rest_hash = padoff;
1701                                         }
1702                                 }
1703                         }
1704
1705                         if (lhs) {
1706                                 OP *rhs;
1707                                 lhs->op_flags |= OPf_PARENS;
1708                                 rhs = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
1709
1710                                 *prelude_sentinel = op_append_list(
1711                                         OP_LINESEQ, *prelude_sentinel,
1712                                         newSTATEOP(
1713                                                 0, NULL,
1714                                                 newASSIGNOP(OPf_STACKED, lhs, 0, rhs)
1715                                         )
1716                                 );
1717                         }
1718                 }
1719
1720                 /* default positional arguments */
1721                 {
1722                         size_t i, lim, req;
1723                         OP *nest;
1724
1725                         nest = NULL;
1726
1727                         req = param_spec->positional_required.used;
1728                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1729                                 ParamInit *cur = &param_spec->positional_optional.data[i];
1730                                 OP *var, *cond;
1731
1732                                 cond = newBINOP(
1733                                         OP_LT, 0,
1734                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1735                                         mkconstiv(aTHX_ req + i + 1)
1736                                 );
1737
1738                                 var = my_var(aTHX_ 0, cur->param.padoff);
1739
1740                                 nest = op_append_list(
1741                                         OP_LINESEQ, nest,
1742                                         newASSIGNOP(OPf_STACKED, var, 0, cur->init)
1743                                 );
1744                                 cur->init = NULL;
1745                                 nest = newCONDOP(
1746                                         0,
1747                                         cond,
1748                                         nest,
1749                                         NULL
1750                                 );
1751                         }
1752
1753                         *prelude_sentinel = op_append_list(
1754                                 OP_LINESEQ, *prelude_sentinel,
1755                                 nest
1756                         );
1757                 }
1758
1759                 /* named parameters */
1760                 if (count_named_params(param_spec)) {
1761                         size_t i, lim;
1762
1763                         assert(param_spec->rest_hash != NOT_IN_PAD);
1764
1765                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1766                                 Param *cur = &param_spec->named_required.data[i];
1767                                 size_t n;
1768                                 char *p = SvPV(cur->name, n);
1769                                 OP *var, *cond;
1770
1771                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1772
1773                                 if (spec->flags & FLAG_CHECK_NARGS) {
1774                                         OP *xcroak, *msg;
1775
1776                                         var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1777                                         var = newUNOP(OP_DELETE, 0, var);
1778
1779                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": missing named parameter: %.*s", SVfARG(declarator), (int)(n - 1), p + 1));
1780                                         xcroak = newCVREF(
1781                                                 OPf_WANT_SCALAR,
1782                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1783                                         );
1784                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1785
1786                                         cond = newUNOP(OP_EXISTS, 0, cond);
1787
1788                                         cond = newCONDOP(0, cond, var, xcroak);
1789                                 }
1790
1791                                 var = my_var(
1792                                         aTHX_
1793                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1794                                         cur->padoff
1795                                 );
1796                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1797
1798                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1799                         }
1800
1801                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1802                                 ParamInit *cur = &param_spec->named_optional.data[i];
1803                                 size_t n;
1804                                 char *p = SvPV(cur->param.name, n);
1805                                 OP *var, *cond;
1806
1807                                 var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1808                                 var = newUNOP(OP_DELETE, 0, var);
1809
1810                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1811                                 cond = newUNOP(OP_EXISTS, 0, cond);
1812
1813                                 cond = newCONDOP(0, cond, var, cur->init);
1814                                 cur->init = NULL;
1815
1816                                 var = my_var(
1817                                         aTHX_
1818                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1819                                         cur->param.padoff
1820                                 );
1821                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1822
1823                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1824                         }
1825
1826                         if (!param_spec->slurpy.name) {
1827                                 if (spec->flags & FLAG_CHECK_NARGS) {
1828                                         /* croak if %{rest} */
1829                                         OP *xcroak, *cond, *keys, *msg;
1830
1831                                         keys = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1832                                         keys = newLISTOP(OP_SORT, 0, newOP(OP_PUSHMARK, 0), keys);
1833                                         {
1834                                                 OP *first, *mid, *last;
1835
1836                                                 last = keys;
1837
1838                                                 mid = mkconstpvs(", ");
1839                                                 mid->op_sibling = last;
1840
1841                                                 first = newOP(OP_PUSHMARK, 0);
1842
1843                                                 keys = newLISTOP(OP_JOIN, 0, first, mid);
1844                                                 keys->op_targ = pad_alloc(OP_JOIN, SVs_PADTMP);
1845                                                 ((LISTOP *)keys)->op_last = last;
1846                                         }
1847
1848                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": no such named parameter: ", SVfARG(declarator)));
1849                                         msg = newBINOP(OP_CONCAT, 0, msg, keys);
1850
1851                                         xcroak = newCVREF(
1852                                                 OPf_WANT_SCALAR,
1853                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1854                                         );
1855                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1856
1857                                         cond = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1858                                         xcroak = newCONDOP(0, cond, xcroak, NULL);
1859
1860                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, xcroak));
1861                                 } else {
1862                                         OP *clear;
1863
1864                                         clear = newASSIGNOP(
1865                                                 OPf_STACKED,
1866                                                 my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1867                                                 0,
1868                                                 newNULLLIST()
1869                                         );
1870
1871                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, clear));
1872                                 }
1873                         } else if (param_spec->slurpy.padoff != param_spec->rest_hash) {
1874                                 OP *var, *clear;
1875
1876                                 assert(SvPV_nolen(param_spec->slurpy.name)[0] == '@');
1877
1878                                 var = my_var_g(
1879                                         aTHX_
1880                                         OP_PADAV,
1881                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1882                                         param_spec->slurpy.padoff
1883                                 );
1884
1885                                 var = newASSIGNOP(OPf_STACKED, var, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1886
1887                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1888
1889                                 clear = newASSIGNOP(
1890                                         OPf_STACKED,
1891                                         my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1892                                         0,
1893                                         newNULLLIST()
1894                                 );
1895
1896                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, clear));
1897                         }
1898                 }
1899
1900                 if (spec->flags & FLAG_CHECK_TARGS) {
1901                         size_t i, lim, base;
1902
1903                         base = 1;
1904                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1905                                 Param *cur = &param_spec->positional_required.data[i];
1906
1907                                 if (cur->type) {
1908                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1909                                 }
1910                         }
1911                         base += i;
1912
1913                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1914                                 Param *cur = &param_spec->positional_optional.data[i].param;
1915
1916                                 if (cur->type) {
1917                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1918                                 }
1919                         }
1920                         base += i;
1921
1922                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1923                                 Param *cur = &param_spec->named_required.data[i];
1924
1925                                 if (cur->type) {
1926                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1927                                 }
1928                         }
1929                         base += i;
1930
1931                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1932                                 Param *cur = &param_spec->named_optional.data[i].param;
1933
1934                                 if (cur->type) {
1935                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1936                                 }
1937                         }
1938                         base += i;
1939
1940                         if (param_spec->slurpy.type) {
1941                                 /* $type->valid($_) or croak $type->get_message($_) for @rest / values %rest */
1942                                 OP *check, *list, *loop;
1943
1944                                 check = mktypecheck(aTHX_ declarator, base, param_spec->slurpy.name, NOT_IN_PAD, param_spec->slurpy.type);
1945
1946                                 if (SvPV_nolen(param_spec->slurpy.name)[0] == '@') {
1947                                         list = my_var_g(aTHX_ OP_PADAV, 0, param_spec->slurpy.padoff);
1948                                 } else {
1949                                         list = my_var_g(aTHX_ OP_PADHV, 0, param_spec->slurpy.padoff);
1950                                         list = newUNOP(OP_VALUES, 0, list);
1951                                 }
1952
1953                                 loop = newFOROP(0, NULL, list, check, NULL);
1954
1955                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, loop));
1956                         }
1957                 }
1958         }
1959
1960         /* finally let perl parse the actual subroutine body */
1961         body = parse_block(0);
1962
1963         /* add '();' to make function return nothing by default */
1964         /* (otherwise the invisible parameter initialization can "leak" into
1965            the return value: fun ($x) {}->("asdf", 0) == 2) */
1966         if (*prelude_sentinel) {
1967                 body = newSTATEOP(0, NULL, body);
1968         }
1969
1970         body = op_append_list(OP_LINESEQ, *prelude_sentinel, body);
1971         *prelude_sentinel = NULL;
1972
1973         /* it's go time. */
1974         {
1975                 CV *cv;
1976                 OP *const attrs = *attrs_sentinel;
1977                 *attrs_sentinel = NULL;
1978
1979                 SvREFCNT_inc_simple_void(PL_compcv);
1980
1981                 /* close outer block: '}' */
1982                 S_block_end(aTHX_ save_ix, body);
1983
1984                 cv = newATTRSUB(
1985                         floor_ix,
1986                         saw_name ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)) : NULL,
1987                         proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
1988                         attrs,
1989                         body
1990                 );
1991
1992                 register_info(aTHX_ PTR2UV(CvROOT(cv)), declarator, spec, param_spec);
1993
1994                 if (saw_name) {
1995                         *pop = newOP(OP_NULL, 0);
1996                         return KEYWORD_PLUGIN_STMT;
1997                 }
1998
1999                 *pop = newUNOP(
2000                         OP_REFGEN, 0,
2001                         newSVOP(
2002                                 OP_ANONCODE, 0,
2003                                 (SV *)cv
2004                         )
2005                 );
2006                 return KEYWORD_PLUGIN_EXPR;
2007         }
2008 }
2009
2010 static int my_keyword_plugin(pTHX_ char *keyword_ptr, STRLEN keyword_len, OP **op_ptr) {
2011         KWSpec spec;
2012         int ret;
2013         Sentinel sen = { NULL };
2014
2015         ENTER;
2016         SAVETMPS;
2017
2018         SAVEDESTRUCTOR_X(sentinel_clear_void, sen);
2019
2020         if (kw_flags(aTHX_ sen, keyword_ptr, keyword_len, &spec)) {
2021                 ret = parse_fun(aTHX_ sen, op_ptr, keyword_ptr, keyword_len, &spec);
2022         } else {
2023                 ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
2024         }
2025
2026         FREETMPS;
2027         LEAVE;
2028
2029         return ret;
2030 }
2031
2032 WARNINGS_RESET
2033
2034 MODULE = Function::Parameters   PACKAGE = Function::Parameters   PREFIX = fp_
2035 PROTOTYPES: ENABLE
2036
2037 UV
2038 fp__cv_root(sv)
2039         SV * sv
2040         PREINIT:
2041                 CV *xcv;
2042                 HV *hv;
2043                 GV *gv;
2044         CODE:
2045                 xcv = sv_2cv(sv, &hv, &gv, 0);
2046                 RETVAL = PTR2UV(xcv ? CvROOT(xcv) : NULL);
2047         OUTPUT:
2048                 RETVAL
2049
2050 BOOT:
2051 WARNINGS_ENABLE {
2052         HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
2053         /**/
2054         newCONSTSUB(stash, "FLAG_NAME_OK",      newSViv(FLAG_NAME_OK));
2055         newCONSTSUB(stash, "FLAG_ANON_OK",      newSViv(FLAG_ANON_OK));
2056         newCONSTSUB(stash, "FLAG_DEFAULT_ARGS", newSViv(FLAG_DEFAULT_ARGS));
2057         newCONSTSUB(stash, "FLAG_CHECK_NARGS",  newSViv(FLAG_CHECK_NARGS));
2058         newCONSTSUB(stash, "FLAG_INVOCANT",     newSViv(FLAG_INVOCANT));
2059         newCONSTSUB(stash, "FLAG_NAMED_PARAMS", newSViv(FLAG_NAMED_PARAMS));
2060         newCONSTSUB(stash, "FLAG_TYPES_OK",     newSViv(FLAG_TYPES_OK));
2061         newCONSTSUB(stash, "FLAG_CHECK_TARGS",  newSViv(FLAG_CHECK_TARGS));
2062         newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
2063         newCONSTSUB(stash, "HINTK_FLAGS_",   newSVpvs(HINTK_FLAGS_));
2064         newCONSTSUB(stash, "HINTK_SHIFT_",   newSVpvs(HINTK_SHIFT_));
2065         newCONSTSUB(stash, "HINTK_ATTRS_",   newSVpvs(HINTK_ATTRS_));
2066         /**/
2067         next_keyword_plugin = PL_keyword_plugin;
2068         PL_keyword_plugin = my_keyword_plugin;
2069 } WARNINGS_RESET