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         t = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 581
 582         PUTBACK;
 583         FREETMPS;
 584         LEAVE;
 585
 586         if (!SvTRUE(t)) {
 587                 croak("In %"SVf": undefined type '%"SVf"'", SVfARG(declarator), SVfARG(name));
 588         }
 589
 590         return t;
 591 }
 592
 593
 594 DEFSTRUCT(Param) {
 595         SV *name;
 596         PADOFFSET padoff;
 597         SV *type;
 598 };
 599
 600 DEFSTRUCT(ParamInit) {
 601         Param param;
 602         OP *init;
 603 };
 604
 605 #define VEC(B) B ## _Vec
 606
 607 #define DEFVECTOR(B) DEFSTRUCT(VEC(B)) { \
 608         B (*data); \
 609         size_t used, size; \
 610 }
 611
 612 DEFVECTOR(Param);
 613 DEFVECTOR(ParamInit);
 614
 615 #define DEFVECTOR_INIT(N, B) static void N(VEC(B) *p) { \
 616         p->used = 0; \
 617         p->size = 23; \
 618         Newx(p->data, p->size, B); \
 619 } static void N(VEC(B) *)
 620
 621 DEFSTRUCT(ParamSpec) {
 622         Param invocant;
 623         VEC(Param) positional_required;
 624         VEC(ParamInit) positional_optional;
 625         VEC(Param) named_required;
 626         VEC(ParamInit) named_optional;
 627         Param slurpy;
 628         PADOFFSET rest_hash;
 629 };
 630
 631 DEFVECTOR_INIT(pv_init, Param);
 632 DEFVECTOR_INIT(piv_init, ParamInit);
 633
 634 static void p_init(Param *p) {
 635         p->name = NULL;
 636         p->padoff = NOT_IN_PAD;
 637         p->type = NULL;
 638 }
 639
 640 static void ps_init(ParamSpec *ps) {
 641         p_init(&ps->invocant);
 642         pv_init(&ps->positional_required);
 643         piv_init(&ps->positional_optional);
 644         pv_init(&ps->named_required);
 645         piv_init(&ps->named_optional);
 646         p_init(&ps->slurpy);
 647         ps->rest_hash = NOT_IN_PAD;
 648 }
 649
 650 #define DEFVECTOR_EXTEND(N, B) static B (*N(VEC(B) *p)) { \
 651         assert(p->used <= p->size); \
 652         if (p->used == p->size) { \
 653                 const size_t n = p->size / 2 * 3 + 1; \
 654                 Renew(p->data, n, B); \
 655                 p->size = n; \
 656         } \
 657         return &p->data[p->used]; \
 658 } static B (*N(VEC(B) *))
 659
 660 DEFVECTOR_EXTEND(pv_extend, Param);
 661 DEFVECTOR_EXTEND(piv_extend, ParamInit);
 662
 663 #define DEFVECTOR_CLEAR(N, B, F) static void N(pTHX_ VEC(B) *p) { \
 664         while (p->used) { \
 665                 p->used--; \
 666                 F(aTHX_ &p->data[p->used]); \
 667         } \
 668         Safefree(p->data); \
 669         p->data = NULL; \
 670         p->size = 0; \
 671 } static void N(pTHX_ VEC(B) *)
 672
 673 static void p_clear(pTHX_ Param *p) {
 674         p->name = NULL;
 675         p->padoff = NOT_IN_PAD;
 676         p->type = NULL;
 677 }
 678
 679 static void pi_clear(pTHX_ ParamInit *pi) {
 680         p_clear(aTHX_ &pi->param);
 681         if (pi->init) {
 682                 op_free(pi->init);
 683                 pi->init = NULL;
 684         }
 685 }
 686
 687 DEFVECTOR_CLEAR(pv_clear, Param, p_clear);
 688 DEFVECTOR_CLEAR(piv_clear, ParamInit, pi_clear);
 689
 690 static void ps_clear(pTHX_ ParamSpec *ps) {
 691         p_clear(aTHX_ &ps->invocant);
 692
 693         pv_clear(aTHX_ &ps->positional_required);
 694         piv_clear(aTHX_ &ps->positional_optional);
 695
 696         pv_clear(aTHX_ &ps->named_required);
 697         piv_clear(aTHX_ &ps->named_optional);
 698
 699         p_clear(aTHX_ &ps->slurpy);
 700 }
 701
 702 static int ps_contains(pTHX_ const ParamSpec *ps, SV *sv) {
 703         size_t i, lim;
 704
 705         if (ps->invocant.name && sv_eq(sv, ps->invocant.name)) {
 706                 return 1;
 707         }
 708
 709         for (i = 0, lim = ps->positional_required.used; i < lim; i++) {
 710                 if (sv_eq(sv, ps->positional_required.data[i].name)) {
 711                         return 1;
 712                 }
 713         }
 714
 715         for (i = 0, lim = ps->positional_optional.used; i < lim; i++) {
 716                 if (sv_eq(sv, ps->positional_optional.data[i].param.name)) {
 717                         return 1;
 718                 }
 719         }
 720
 721         for (i = 0, lim = ps->named_required.used; i < lim; i++) {
 722                 if (sv_eq(sv, ps->named_required.data[i].name)) {
 723                         return 1;
 724                 }
 725         }
 726
 727         for (i = 0, lim = ps->named_optional.used; i < lim; i++) {
 728                 if (sv_eq(sv, ps->named_optional.data[i].param.name)) {
 729                         return 1;
 730                 }
 731         }
 732
 733         return 0;
 734 }
 735
 736 static void ps_free_void(pTHX_ void *p) {
 737         ps_clear(aTHX_ p);
 738         Safefree(p);
 739 }
 740
 741 static int args_min(pTHX_ const ParamSpec *ps, const KWSpec *ks) {
 742         int n = 0;
 743         if (!ps) {
 744                 return SvTRUE(ks->shift) ? 1 : 0;
 745         }
 746         if (ps->invocant.name) {
 747                 n++;
 748         }
 749         n += ps->positional_required.used;
 750         n += ps->named_required.used * 2;
 751         return n;
 752 }
 753
 754 static int args_max(const ParamSpec *ps) {
 755         int n = 0;
 756         if (!ps) {
 757                 return -1;
 758         }
 759         if (ps->invocant.name) {
 760                 n++;
 761         }
 762         n += ps->positional_required.used;
 763         n += ps->positional_optional.used;
 764         if (ps->named_required.used || ps->named_optional.used || ps->slurpy.name) {
 765                 n = -1;
 766         }
 767         return n;
 768 }
 769
 770 static size_t count_positional_params(const ParamSpec *ps) {
 771         return ps->positional_required.used + ps->positional_optional.used;
 772 }
 773
 774 static size_t count_named_params(const ParamSpec *ps) {
 775         return ps->named_required.used + ps->named_optional.used;
 776 }
 777
 778 static void my_require(pTHX_ const char *file) {
 779         require_pv(file);
 780         if (SvTRUE(ERRSV)) {
 781                 croak_sv(ERRSV);
 782         }
 783 }
 784
 785 static SV *my_eval(pTHX_ Sentinel sen, I32 floor, OP *op) {
 786         SV *sv;
 787         CV *cv;
 788         dSP;
 789
 790         cv = newATTRSUB(floor, NULL, NULL, NULL, op);
 791
 792         ENTER;
 793         SAVETMPS;
 794
 795         PUSHMARK(SP);
 796         call_sv((SV *)cv, G_SCALAR | G_NOARGS);
 797         SPAGAIN;
 798         sv = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 799
 800         PUTBACK;
 801         FREETMPS;
 802         LEAVE;
 803
 804         return sv;
 805 }
 806
 807 enum {
 808         PARAM_INVOCANT = 0x01,
 809         PARAM_NAMED    = 0x02
 810 };
 811
 812 /* *pinit must be NULL on entry.
 813  * caller must free *pinit on error.
 814  */
 815 static PADOFFSET parse_param(
 816         pTHX_
 817         Sentinel sen,
 818         const SV *declarator, const KWSpec *spec, ParamSpec *param_spec,
 819         int *pflags, SV **pname, OP **pinit, SV **ptype
 820 ) {
 821         I32 c;
 822         char sigil;
 823         SV *name;
 824
 825         assert(!*pinit);
 826         *pflags = 0;
 827         *ptype = NULL;
 828
 829         c = lex_peek_unichar(0);
 830
 831         if (spec->flags & FLAG_TYPES_OK) {
 832                 if (c == '(') {
 833                         I32 floor;
 834                         OP *expr;
 835                         Resource *expr_sentinel;
 836
 837                         lex_read_unichar(0);
 838
 839                         floor = start_subparse(FALSE, 0);
 840                         SAVEFREESV(PL_compcv);
 841                         CvSPECIAL_on(PL_compcv);
 842
 843                         if (!(expr = parse_fullexpr(PARSE_OPTIONAL))) {
 844                                 croak("In %"SVf": invalid type expression", SVfARG(declarator));
 845                         }
 846                         expr_sentinel = sentinel_register(sen, expr, free_op_void);
 847
 848                         lex_read_space(0);
 849                         c = lex_peek_unichar(0);
 850                         if (c != ')') {
 851                                 croak("In %"SVf": missing ')' after type expression", SVfARG(declarator));
 852                         }
 853                         lex_read_unichar(0);
 854                         lex_read_space(0);
 855
 856                         SvREFCNT_inc_simple_void(PL_compcv);
 857                         sentinel_disarm(expr_sentinel);
 858                         *ptype = my_eval(aTHX_ sen, floor, expr);
 859                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 860                         if (!sv_isobject(*ptype)) {
 861                                 croak("In %"SVf": (%"SVf") doesn't look like a type object", SVfARG(declarator), SVfARG(*ptype));
 862                         }
 863
 864                         c = lex_peek_unichar(0);
 865                 } else if (my_is_uni_xidfirst(aTHX_ c)) {
 866                         *ptype = parse_type(aTHX_ sen, declarator);
 867                         my_require(aTHX_ "Moose/Util/TypeConstraints.pm");
 868                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 869
 870                         c = lex_peek_unichar(0);
 871                 }
 872         }
 873
 874         if (c == ':') {
 875                 lex_read_unichar(0);
 876                 lex_read_space(0);
 877
 878                 *pflags |= PARAM_NAMED;
 879
 880                 c = lex_peek_unichar(0);
 881         }
 882
 883         if (c == -1) {
 884                 croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 885         }
 886
 887         if (!(c == '$' || c == '@' || c == '%')) {
 888                 croak("In %"SVf": unexpected '%c' in parameter list (expecting a sigil)", SVfARG(declarator), (int)c);
 889         }
 890
 891         sigil = c;
 892
 893         lex_read_unichar(0);
 894         lex_read_space(0);
 895
 896         if (!(name = my_scan_word(aTHX_ sen, FALSE))) {
 897                 croak("In %"SVf": missing identifier after '%c'", SVfARG(declarator), sigil);
 898         }
 899         sv_insert(name, 0, 0, &sigil, 1);
 900         *pname = name;
 901
 902         lex_read_space(0);
 903         c = lex_peek_unichar(0);
 904
 905         if (c == '=') {
 906                 lex_read_unichar(0);
 907                 lex_read_space(0);
 908
 909
 910                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
 911                         param_spec->invocant.name = spec->shift;
 912                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
 913                 }
 914
 915                 *pinit = parse_termexpr(0);
 916
 917                 lex_read_space(0);
 918                 c = lex_peek_unichar(0);
 919         }
 920
 921         if (c == ':') {
 922                 *pflags |= PARAM_INVOCANT;
 923                 lex_read_unichar(0);
 924                 lex_read_space(0);
 925         } else if (c == ',') {
 926                 lex_read_unichar(0);
 927                 lex_read_space(0);
 928         } else if (c != ')') {
 929                 if (c == -1) {
 930                         croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 931                 }
 932                 croak("In %"SVf": unexpected '%c' in parameter list (expecting ',')", SVfARG(declarator), (int)c);
 933         }
 934
 935         return pad_add_name_sv(*pname, IF_HAVE_PERL_5_16(padadd_NO_DUP_CHECK, 0), NULL, NULL);
 936 }
 937
 938 static OP *my_var_g(pTHX_ I32 type, I32 flags, PADOFFSET padoff) {
 939         OP *var = newOP(type, flags);
 940         var->op_targ = padoff;
 941         return var;
 942 }
 943
 944 static OP *my_var(pTHX_ I32 flags, PADOFFSET padoff) {
 945         return my_var_g(aTHX_ OP_PADSV, flags, padoff);
 946 }
 947
 948 static OP *mkhvelem(pTHX_ PADOFFSET h, OP *k) {
 949         OP *hv = my_var_g(aTHX_ OP_PADHV, OPf_REF, h);
 950         return newBINOP(OP_HELEM, 0, hv, k);
 951 }
 952
 953 static OP *mkconstsv(pTHX_ SV *sv) {
 954         return newSVOP(OP_CONST, 0, sv);
 955 }
 956
 957 static OP *mkconstiv(pTHX_ IV i) {
 958         return mkconstsv(aTHX_ newSViv(i));
 959 }
 960
 961 static OP *mkconstpv(pTHX_ const char *p, size_t n) {
 962         return mkconstsv(aTHX_ newSVpv(p, n));
 963 }
 964
 965 #define mkconstpvs(S) mkconstpv(aTHX_ "" S "", sizeof S - 1)
 966
 967 static OP *mktypecheck(pTHX_ const SV *declarator, int nr, SV *name, PADOFFSET padoff, SV *type) {
 968         /* $type->check($value) or Carp::croak "...: " . $type->get_message($value) */
 969         OP *chk, *cond, *err, *msg, *xcroak;
 970
 971         err = mkconstsv(aTHX_ newSVpvf("In %"SVf": parameter %d (%"SVf"): ", SVfARG(declarator), nr, SVfARG(name)));
 972         {
 973                 OP *args = NULL;
 974
 975                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 976                 args = op_append_elem(
 977                         OP_LIST, args,
 978                         padoff == NOT_IN_PAD
 979                                 ? S_newDEFSVOP(aTHX)
 980                                 : my_var(aTHX_ 0, padoff)
 981                 );
 982                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("get_message")));
 983
 984                 msg = args;
 985                 msg->op_type = OP_ENTERSUB;
 986                 msg->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 987                 msg->op_flags |= OPf_STACKED;
 988         }
 989
 990         msg = newBINOP(OP_CONCAT, 0, err, msg);
 991
 992         xcroak = newCVREF(
 993                 OPf_WANT_SCALAR,
 994                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
 995         );
 996         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
 997
 998         {
 999                 OP *args = NULL;
1000
1001                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
1002                 args = op_append_elem(
1003                         OP_LIST, args,
1004                         padoff == NOT_IN_PAD
1005                                 ? S_newDEFSVOP(aTHX)
1006                                 : my_var(aTHX_ 0, padoff)
1007                 );
1008                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("check")));
1009
1010                 chk = args;
1011                 chk->op_type = OP_ENTERSUB;
1012                 chk->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
1013                 chk->op_flags |= OPf_STACKED;
1014         }
1015
1016         chk = newLOGOP(OP_OR, 0, chk, xcroak);
1017         return chk;
1018 }
1019
1020 static OP *mktypecheckp(pTHX_ const SV *declarator, int nr, const Param *param) {
1021         return mktypecheck(aTHX_ declarator, nr, param->name, param->padoff, param->type);
1022 }
1023
1024 static void register_info(pTHX_ UV key, SV *declarator, const KWSpec *kws, const ParamSpec *ps) {
1025         dSP;
1026
1027         ENTER;
1028         SAVETMPS;
1029
1030         PUSHMARK(SP);
1031         EXTEND(SP, 10);
1032
1033         /* 0 */ {
1034                 mPUSHu(key);
1035         }
1036         /* 1 */ {
1037                 size_t n;
1038                 char *p = SvPV(declarator, n);
1039                 char *q = memchr(p, ' ', n);
1040                 mPUSHp(p, q ? (size_t)(q - p) : n);
1041         }
1042         if (!ps) {
1043                 if (SvTRUE(kws->shift)) {
1044                         PUSHs(kws->shift);
1045                 } else {
1046                         PUSHmortal;
1047                 }
1048                 PUSHmortal;
1049                 mPUSHs(newRV_noinc((SV *)newAV()));
1050                 mPUSHs(newRV_noinc((SV *)newAV()));
1051                 mPUSHs(newRV_noinc((SV *)newAV()));
1052                 mPUSHs(newRV_noinc((SV *)newAV()));
1053                 mPUSHp("@_", 2);
1054                 PUSHmortal;
1055         } else {
1056                 /* 2, 3 */ {
1057                         if (ps->invocant.name) {
1058                                 PUSHs(ps->invocant.name);
1059                                 if (ps->invocant.type) {
1060                                         PUSHs(ps->invocant.type);
1061                                 } else {
1062                                         PUSHmortal;
1063                                 }
1064                         } else {
1065                                 PUSHmortal;
1066                                 PUSHmortal;
1067                         }
1068                 }
1069                 /* 4 */ {
1070                         size_t i, lim;
1071                         AV *av;
1072
1073                         lim = ps->positional_required.used;
1074
1075                         av = newAV();
1076                         if (lim) {
1077                                 av_extend(av, (lim - 1) * 2);
1078                                 for (i = 0; i < lim; i++) {
1079                                         Param *cur = &ps->positional_required.data[i];
1080                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1081                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1082                                 }
1083                         }
1084
1085                         mPUSHs(newRV_noinc((SV *)av));
1086                 }
1087                 /* 5 */ {
1088                         size_t i, lim;
1089                         AV *av;
1090
1091                         lim = ps->positional_optional.used;
1092
1093                         av = newAV();
1094                         if (lim) {
1095                                 av_extend(av, (lim - 1) * 2);
1096                                 for (i = 0; i < lim; i++) {
1097                                         Param *cur = &ps->positional_optional.data[i].param;
1098                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1099                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1100                                 }
1101                         }
1102
1103                         mPUSHs(newRV_noinc((SV *)av));
1104                 }
1105                 /* 6 */ {
1106                         size_t i, lim;
1107                         AV *av;
1108
1109                         lim = ps->named_required.used;
1110
1111                         av = newAV();
1112                         if (lim) {
1113                                 av_extend(av, (lim - 1) * 2);
1114                                 for (i = 0; i < lim; i++) {
1115                                         Param *cur = &ps->named_required.data[i];
1116                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1117                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1118                                 }
1119                         }
1120
1121                         mPUSHs(newRV_noinc((SV *)av));
1122                 }
1123                 /* 7 */ {
1124                         size_t i, lim;
1125                         AV *av;
1126
1127                         lim = ps->named_optional.used;
1128
1129                         av = newAV();
1130                         if (lim) {
1131                                 av_extend(av, (lim - 1) * 2);
1132                                 for (i = 0; i < lim; i++) {
1133                                         Param *cur = &ps->named_optional.data[i].param;
1134                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1135                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1136                                 }
1137                         }
1138
1139                         mPUSHs(newRV_noinc((SV *)av));
1140                 }
1141                 /* 8, 9 */ {
1142                         if (ps->slurpy.name) {
1143                                 PUSHs(ps->slurpy.name);
1144                                 if (ps->slurpy.type) {
1145                                         PUSHs(ps->slurpy.type);
1146                                 } else {
1147                                         PUSHmortal;
1148                                 }
1149                         } else {
1150                                 PUSHmortal;
1151                                 PUSHmortal;
1152                         }
1153                 }
1154         }
1155         PUTBACK;
1156
1157         call_pv(MY_PKG "::_register_info", G_VOID);
1158
1159         FREETMPS;
1160         LEAVE;
1161 }
1162
1163 static int parse_fun(pTHX_ Sentinel sen, OP **pop, const char *keyword_ptr, STRLEN keyword_len, const KWSpec *spec) {
1164         ParamSpec *param_spec;
1165         SV *declarator;
1166         I32 floor_ix;
1167         int save_ix;
1168         SV *saw_name;
1169         OP **prelude_sentinel;
1170         SV *proto;
1171         OP **attrs_sentinel, *body;
1172         unsigned builtin_attrs;
1173         I32 c;
1174
1175         declarator = sentinel_mortalize(sen, newSVpvn(keyword_ptr, keyword_len));
1176
1177         lex_read_space(0);
1178
1179         builtin_attrs = 0;
1180
1181         /* function name */
1182         saw_name = NULL;
1183         if ((spec->flags & FLAG_NAME_OK) && (saw_name = my_scan_word(aTHX_ sen, TRUE))) {
1184
1185                 if (PL_parser->expect != XSTATE) {
1186                         /* bail out early so we don't predeclare $saw_name */
1187                         croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
1188                 }
1189
1190                 sv_catpvs(declarator, " ");
1191                 sv_catsv(declarator, saw_name);
1192
1193                 if (
1194                         sv_eq_pvs(saw_name, "BEGIN") ||
1195                         sv_eq_pvs(saw_name, "END") ||
1196                         sv_eq_pvs(saw_name, "INIT") ||
1197                         sv_eq_pvs(saw_name, "CHECK") ||
1198                         sv_eq_pvs(saw_name, "UNITCHECK")
1199                 ) {
1200                         builtin_attrs |= MY_ATTR_SPECIAL;
1201                 }
1202
1203                 lex_read_space(0);
1204         } else if (!(spec->flags & FLAG_ANON_OK)) {
1205                 croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - PL_parser->bufptr), PL_parser->bufptr);
1206         } else {
1207                 sv_catpvs(declarator, " (anon)");
1208         }
1209
1210         /* we're a subroutine declaration */
1211         floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
1212         SAVEFREESV(PL_compcv);
1213
1214         /* create outer block: '{' */
1215         save_ix = S_block_start(aTHX_ TRUE);
1216
1217         /* initialize synthetic optree */
1218         Newx(prelude_sentinel, 1, OP *);
1219         *prelude_sentinel = NULL;
1220         sentinel_register(sen, prelude_sentinel, free_ptr_op_void);
1221
1222         /* parameters */
1223         param_spec = NULL;
1224
1225         c = lex_peek_unichar(0);
1226         if (c == '(') {
1227                 OP **init_sentinel;
1228
1229                 Newx(init_sentinel, 1, OP *);
1230                 *init_sentinel = NULL;
1231                 sentinel_register(sen, init_sentinel, free_ptr_op_void);
1232
1233                 Newx(param_spec, 1, ParamSpec);
1234                 ps_init(param_spec);
1235                 sentinel_register(sen, param_spec, ps_free_void);
1236
1237                 lex_read_unichar(0);
1238                 lex_read_space(0);
1239
1240                 while ((c = lex_peek_unichar(0)) != ')') {
1241                         int flags;
1242                         SV *name, *type;
1243                         char sigil;
1244                         PADOFFSET padoff;
1245
1246                         padoff = parse_param(aTHX_ sen, declarator, spec, param_spec, &flags, &name, init_sentinel, &type);
1247
1248                         S_intro_my(aTHX);
1249
1250                         sigil = SvPV_nolen(name)[0];
1251
1252                         /* internal consistency */
1253                         if (flags & PARAM_NAMED) {
1254                                 if (flags & PARAM_INVOCANT) {
1255                                         croak("In %"SVf": invocant %"SVf" can't be a named parameter", SVfARG(declarator), SVfARG(name));
1256                                 }
1257                                 if (sigil != '$') {
1258                                         croak("In %"SVf": named parameter %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1259                                 }
1260                         } else if (flags & PARAM_INVOCANT) {
1261                                 if (*init_sentinel) {
1262                                         croak("In %"SVf": invocant %"SVf" can't have a default value", SVfARG(declarator), SVfARG(name));
1263                                 }
1264                                 if (sigil != '$') {
1265                                         croak("In %"SVf": invocant %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1266                                 }
1267                         } else if (sigil != '$' && *init_sentinel) {
1268                                 croak("In %"SVf": %s %"SVf" can't have a default value", SVfARG(declarator), sigil == '@' ? "array" : "hash", SVfARG(name));
1269                         }
1270
1271                         /* external constraints */
1272                         if (param_spec->slurpy.name) {
1273                                 croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(param_spec->slurpy.name), SVfARG(name));
1274                         }
1275                         if (sigil != '$') {
1276                                 assert(!*init_sentinel);
1277                                 param_spec->slurpy.name = name;
1278                                 param_spec->slurpy.padoff = padoff;
1279                                 param_spec->slurpy.type = type;
1280                                 continue;
1281                         }
1282
1283                         if (!(flags & PARAM_NAMED) && count_named_params(param_spec)) {
1284                                 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));
1285                         }
1286
1287                         if (flags & PARAM_INVOCANT) {
1288                                 if (param_spec->invocant.name) {
1289                                         croak("In %"SVf": invalid double invocants %"SVf", %"SVf"", SVfARG(declarator), SVfARG(param_spec->invocant.name), SVfARG(name));
1290                                 }
1291                                 if (count_positional_params(param_spec) || count_named_params(param_spec)) {
1292                                         croak("In %"SVf": invocant %"SVf" must be first in parameter list", SVfARG(declarator), SVfARG(name));
1293                                 }
1294                                 if (!(spec->flags & FLAG_INVOCANT)) {
1295                                         croak("In %"SVf": invocant %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1296                                 }
1297                                 param_spec->invocant.name = name;
1298                                 param_spec->invocant.padoff = padoff;
1299                                 param_spec->invocant.type = type;
1300                                 continue;
1301                         }
1302
1303                         if (*init_sentinel && !(spec->flags & FLAG_DEFAULT_ARGS)) {
1304                                 croak("In %"SVf": default argument for %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1305                         }
1306
1307                         if (ps_contains(aTHX_ param_spec, name)) {
1308                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(name));
1309                         }
1310
1311                         if (flags & PARAM_NAMED) {
1312                                 if (!(spec->flags & FLAG_NAMED_PARAMS)) {
1313                                         croak("In %"SVf": named parameter :%"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1314                                 }
1315
1316                                 if (*init_sentinel) {
1317                                         ParamInit *pi = piv_extend(&param_spec->named_optional);
1318                                         pi->param.name = name;
1319                                         pi->param.padoff = padoff;
1320                                         pi->param.type = type;
1321                                         pi->init = *init_sentinel;
1322                                         *init_sentinel = NULL;
1323                                         param_spec->named_optional.used++;
1324                                 } else {
1325                                         Param *p;
1326
1327                                         if (param_spec->positional_optional.used) {
1328                                                 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));
1329                                         }
1330
1331                                         p = pv_extend(&param_spec->named_required);
1332                                         p->name = name;
1333                                         p->padoff = padoff;
1334                                         p->type = type;
1335                                         param_spec->named_required.used++;
1336                                 }
1337                         } else {
1338                                 if (*init_sentinel || param_spec->positional_optional.used) {
1339                                         ParamInit *pi = piv_extend(&param_spec->positional_optional);
1340                                         pi->param.name = name;
1341                                         pi->param.padoff = padoff;
1342                                         pi->param.type = type;
1343                                         pi->init = *init_sentinel;
1344                                         *init_sentinel = NULL;
1345                                         param_spec->positional_optional.used++;
1346                                 } else {
1347                                         Param *p = pv_extend(&param_spec->positional_required);
1348                                         p->name = name;
1349                                         p->padoff = padoff;
1350                                         p->type = type;
1351                                         param_spec->positional_required.used++;
1352                                 }
1353                         }
1354
1355                 }
1356                 lex_read_unichar(0);
1357                 lex_read_space(0);
1358                 *init_sentinel = NULL;
1359
1360                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
1361                         if (ps_contains(aTHX_ param_spec, spec->shift)) {
1362                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(spec->shift));
1363                         }
1364
1365                         param_spec->invocant.name = spec->shift;
1366                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
1367                 }
1368         }
1369
1370         /* prototype */
1371         proto = NULL;
1372         c = lex_peek_unichar(0);
1373         if (c == ':') {
1374                 lex_read_unichar(0);
1375                 lex_read_space(0);
1376
1377                 c = lex_peek_unichar(0);
1378                 if (c != '(') {
1379                         lex_stuff_pvs(":", 0);
1380                         c = ':';
1381                 } else {
1382                         lex_read_unichar(0);
1383                         if (!(proto = my_scan_parens_tail(aTHX_ sen, FALSE))) {
1384                                 croak("In %"SVf": prototype not terminated", SVfARG(declarator));
1385                         }
1386                         my_check_prototype(aTHX_ sen, declarator, proto);
1387                         lex_read_space(0);
1388                         c = lex_peek_unichar(0);
1389                         if (!(c == ':' || c == '{')) {
1390                                 lex_stuff_pvs(":", 0);
1391                                 c = ':';
1392                         }
1393                 }
1394         }
1395
1396         /* attributes */
1397         Newx(attrs_sentinel, 1, OP *);
1398         *attrs_sentinel = NULL;
1399         sentinel_register(sen, attrs_sentinel, free_ptr_op_void);
1400
1401         if (c == ':' || c == '{') /* '}' - hi, vim */ {
1402
1403                 /* kludge default attributes in */
1404                 if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
1405                         lex_stuff_sv(spec->attrs, 0);
1406                         c = ':';
1407                 }
1408
1409                 if (c == ':') {
1410                         lex_read_unichar(0);
1411                         lex_read_space(0);
1412                         c = lex_peek_unichar(0);
1413
1414                         for (;;) {
1415                                 SV *attr;
1416
1417                                 if (!(attr = my_scan_word(aTHX_ sen, FALSE))) {
1418                                         break;
1419                                 }
1420
1421                                 lex_read_space(0);
1422                                 c = lex_peek_unichar(0);
1423
1424                                 if (c != '(') {
1425                                         if (sv_eq_pvs(attr, "lvalue")) {
1426                                                 builtin_attrs |= MY_ATTR_LVALUE;
1427                                                 attr = NULL;
1428                                         } else if (sv_eq_pvs(attr, "method")) {
1429                                                 builtin_attrs |= MY_ATTR_METHOD;
1430                                                 attr = NULL;
1431                                         }
1432                                 } else {
1433                                         SV *sv;
1434                                         lex_read_unichar(0);
1435                                         if (!(sv = my_scan_parens_tail(aTHX_ sen, TRUE))) {
1436                                                 croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
1437                                         }
1438                                         sv_catpvs(attr, "(");
1439                                         sv_catsv(attr, sv);
1440                                         sv_catpvs(attr, ")");
1441
1442                                         lex_read_space(0);
1443                                         c = lex_peek_unichar(0);
1444                                 }
1445
1446                                 if (attr) {
1447                                         *attrs_sentinel = op_append_elem(OP_LIST, *attrs_sentinel, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(attr)));
1448                                 }
1449
1450                                 if (c == ':') {
1451                                         lex_read_unichar(0);
1452                                         lex_read_space(0);
1453                                         c = lex_peek_unichar(0);
1454                                 }
1455                         }
1456                 }
1457         }
1458
1459         /* body */
1460         if (c != '{') /* '}' - hi, vim */ {
1461                 croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
1462         }
1463
1464         /* surprise predeclaration! */
1465         if (saw_name) {
1466                 /* 'sub NAME (PROTO);' to make name/proto known to perl before it
1467                    starts parsing the body */
1468                 const I32 sub_ix = start_subparse(FALSE, 0);
1469                 SAVEFREESV(PL_compcv);
1470
1471                 SvREFCNT_inc_simple_void(PL_compcv);
1472
1473                 newATTRSUB(
1474                         sub_ix,
1475                         mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(saw_name)),
1476                         proto ? mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(proto)) : NULL,
1477                         NULL,
1478                         NULL
1479                 );
1480         }
1481
1482         if (builtin_attrs & MY_ATTR_LVALUE) {
1483                 CvLVALUE_on(PL_compcv);
1484         }
1485         if (builtin_attrs & MY_ATTR_METHOD) {
1486                 CvMETHOD_on(PL_compcv);
1487         }
1488         if (builtin_attrs & MY_ATTR_SPECIAL) {
1489                 CvSPECIAL_on(PL_compcv);
1490         }
1491
1492         /* check number of arguments */
1493         if (spec->flags & FLAG_CHECK_NARGS) {
1494                 int amin, amax;
1495
1496                 amin = args_min(aTHX_ param_spec, spec);
1497                 if (amin > 0) {
1498                         OP *chk, *cond, *err, *xcroak;
1499
1500                         err = mkconstsv(aTHX_ newSVpvf("Not enough arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amin));
1501                         err = newBINOP(
1502                                 OP_CONCAT, 0,
1503                                 err,
1504                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1505                         );
1506                         err = newBINOP(
1507                                 OP_CONCAT, 0,
1508                                 err,
1509                                 mkconstpvs(")")
1510                         );
1511
1512                         xcroak = newCVREF(OPf_WANT_SCALAR,
1513                                           newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV)));
1514                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1515                                       op_append_elem(OP_LIST, err, xcroak));
1516
1517                         cond = newBINOP(OP_LT, 0,
1518                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1519                                         mkconstiv(aTHX_ amin));
1520                         chk = newLOGOP(OP_AND, 0, cond, err);
1521
1522                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1523                 }
1524
1525                 amax = args_max(param_spec);
1526                 if (amax >= 0) {
1527                         OP *chk, *cond, *err, *xcroak;
1528
1529                         err = mkconstsv(aTHX_ newSVpvf("Too many arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amax));
1530                         err = newBINOP(
1531                                 OP_CONCAT, 0,
1532                                 err,
1533                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1534                         );
1535                         err = newBINOP(
1536                                 OP_CONCAT, 0,
1537                                 err,
1538                                 mkconstpvs(")")
1539                         );
1540
1541                         xcroak = newCVREF(
1542                                 OPf_WANT_SCALAR,
1543                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1544                         );
1545                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1546                         op_append_elem(OP_LIST, err, xcroak));
1547
1548                         cond = newBINOP(
1549                                 OP_GT, 0,
1550                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1551                                 mkconstiv(aTHX_ amax)
1552                         );
1553                         chk = newLOGOP(OP_AND, 0, cond, err);
1554
1555                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1556                 }
1557
1558                 if (param_spec && (count_named_params(param_spec) || (param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%'))) {
1559                         OP *chk, *cond, *err, *xcroak;
1560                         const UV fixed = count_positional_params(param_spec) + !!param_spec->invocant.name;
1561
1562                         err = mkconstsv(aTHX_ newSVpvf("Odd number of paired arguments for %"SVf"", SVfARG(declarator)));
1563
1564                         xcroak = newCVREF(
1565                                 OPf_WANT_SCALAR,
1566                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1567                         );
1568                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1569                         op_append_elem(OP_LIST, err, xcroak));
1570
1571                         cond = newBINOP(OP_GT, 0,
1572                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1573                                         mkconstiv(aTHX_ fixed));
1574                         cond = newLOGOP(OP_AND, 0,
1575                                         cond,
1576                                         newBINOP(OP_MODULO, 0,
1577                                                  fixed
1578                                                  ? newBINOP(OP_SUBTRACT, 0,
1579                                                             newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1580                                                             mkconstiv(aTHX_ fixed))
1581                                                  : newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1582                                                  mkconstiv(aTHX_ 2)));
1583                         chk = newLOGOP(OP_AND, 0, cond, err);
1584
1585                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, chk));
1586                 }
1587         }
1588
1589         if (!param_spec) {
1590                 /* my $invocant = shift; */
1591                 if (SvTRUE(spec->shift)) {
1592                         OP *var;
1593
1594                         var = my_var(
1595                                 aTHX_
1596                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1597                                 pad_add_name_sv(spec->shift, 0, NULL, NULL)
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         } else {
1604                 /* my $invocant = shift; */
1605                 if (param_spec->invocant.name) {
1606                         OP *var;
1607
1608                         var = my_var(
1609                                 aTHX_
1610                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1611                                 param_spec->invocant.padoff
1612                         );
1613                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1614
1615                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1616
1617                         if (param_spec->invocant.type && (spec->flags & FLAG_CHECK_TARGS)) {
1618                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, 0, &param_spec->invocant)));
1619                         }
1620                 }
1621
1622                 /* my (...) = @_; */
1623                 {
1624                         OP *lhs;
1625                         size_t i, lim;
1626
1627                         lhs = NULL;
1628
1629                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1630                                 OP *const var = my_var(
1631                                         aTHX_
1632                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1633                                         param_spec->positional_required.data[i].padoff
1634                                 );
1635                                 lhs = op_append_elem(OP_LIST, lhs, var);
1636                         }
1637
1638                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1639                                 OP *const var = my_var(
1640                                         aTHX_
1641                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1642                                         param_spec->positional_optional.data[i].param.padoff
1643                                 );
1644                                 lhs = op_append_elem(OP_LIST, lhs, var);
1645                         }
1646
1647                         {
1648                                 PADOFFSET padoff;
1649                                 I32 type;
1650                                 bool slurpy_hash;
1651
1652                                 /*
1653                                  * cases:
1654                                  *  1) no named params
1655                                  *   1.1) slurpy
1656                                  *       => put it in
1657                                  *   1.2) no slurpy
1658                                  *       => nop
1659                                  *  2) named params
1660                                  *   2.1) no slurpy
1661                                  *       => synthetic %{rest}
1662                                  *   2.2) slurpy is a hash
1663                                  *       => put it in
1664                                  *   2.3) slurpy is an array
1665                                  *       => synthetic %{rest}
1666                                  *          remember to declare array later
1667                                  */
1668
1669                                 slurpy_hash = param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%';
1670                                 if (!count_named_params(param_spec)) {
1671                                         if (param_spec->slurpy.name) {
1672                                                 padoff = param_spec->slurpy.padoff;
1673                                                 type = slurpy_hash ? OP_PADHV : OP_PADAV;
1674                                         } else {
1675                                                 padoff = NOT_IN_PAD;
1676                                                 type = OP_PADSV;
1677                                         }
1678                                 } else if (slurpy_hash) {
1679                                         padoff = param_spec->slurpy.padoff;
1680                                         type = OP_PADHV;
1681                                 } else {
1682                                         padoff = param_spec->rest_hash = pad_add_name_pvs("%{rest}", 0, NULL, NULL);
1683                                         type = OP_PADHV;
1684                                 }
1685
1686                                 if (padoff != NOT_IN_PAD) {
1687                                         OP *const var = my_var_g(
1688                                                 aTHX_
1689                                                 type,
1690                                                 OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1691                                                 padoff
1692                                         );
1693
1694                                         lhs = op_append_elem(OP_LIST, lhs, var);
1695
1696                                         if (type == OP_PADHV) {
1697                                                 param_spec->rest_hash = padoff;
1698                                         }
1699                                 }
1700                         }
1701
1702                         if (lhs) {
1703                                 OP *rhs;
1704                                 lhs->op_flags |= OPf_PARENS;
1705                                 rhs = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
1706
1707                                 *prelude_sentinel = op_append_list(
1708                                         OP_LINESEQ, *prelude_sentinel,
1709                                         newSTATEOP(
1710                                                 0, NULL,
1711                                                 newASSIGNOP(OPf_STACKED, lhs, 0, rhs)
1712                                         )
1713                                 );
1714                         }
1715                 }
1716
1717                 /* default positional arguments */
1718                 {
1719                         size_t i, lim, req;
1720                         OP *nest;
1721
1722                         nest = NULL;
1723
1724                         req = param_spec->positional_required.used;
1725                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1726                                 ParamInit *cur = &param_spec->positional_optional.data[i];
1727                                 OP *var, *cond;
1728
1729                                 cond = newBINOP(
1730                                         OP_LT, 0,
1731                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1732                                         mkconstiv(aTHX_ req + i + 1)
1733                                 );
1734
1735                                 var = my_var(aTHX_ 0, cur->param.padoff);
1736
1737                                 nest = op_append_list(
1738                                         OP_LINESEQ, nest,
1739                                         newASSIGNOP(OPf_STACKED, var, 0, cur->init)
1740                                 );
1741                                 cur->init = NULL;
1742                                 nest = newCONDOP(
1743                                         0,
1744                                         cond,
1745                                         nest,
1746                                         NULL
1747                                 );
1748                         }
1749
1750                         *prelude_sentinel = op_append_list(
1751                                 OP_LINESEQ, *prelude_sentinel,
1752                                 nest
1753                         );
1754                 }
1755
1756                 /* named parameters */
1757                 if (count_named_params(param_spec)) {
1758                         size_t i, lim;
1759
1760                         assert(param_spec->rest_hash != NOT_IN_PAD);
1761
1762                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1763                                 Param *cur = &param_spec->named_required.data[i];
1764                                 size_t n;
1765                                 char *p = SvPV(cur->name, n);
1766                                 OP *var, *cond;
1767
1768                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1769
1770                                 if (spec->flags & FLAG_CHECK_NARGS) {
1771                                         OP *xcroak, *msg;
1772
1773                                         var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1774                                         var = newUNOP(OP_DELETE, 0, var);
1775
1776                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": missing named parameter: %.*s", SVfARG(declarator), (int)(n - 1), p + 1));
1777                                         xcroak = newCVREF(
1778                                                 OPf_WANT_SCALAR,
1779                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1780                                         );
1781                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1782
1783                                         cond = newUNOP(OP_EXISTS, 0, cond);
1784
1785                                         cond = newCONDOP(0, cond, var, xcroak);
1786                                 }
1787
1788                                 var = my_var(
1789                                         aTHX_
1790                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1791                                         cur->padoff
1792                                 );
1793                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1794
1795                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1796                         }
1797
1798                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1799                                 ParamInit *cur = &param_spec->named_optional.data[i];
1800                                 size_t n;
1801                                 char *p = SvPV(cur->param.name, n);
1802                                 OP *var, *cond;
1803
1804                                 var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1805                                 var = newUNOP(OP_DELETE, 0, var);
1806
1807                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1808                                 cond = newUNOP(OP_EXISTS, 0, cond);
1809
1810                                 cond = newCONDOP(0, cond, var, cur->init);
1811                                 cur->init = NULL;
1812
1813                                 var = my_var(
1814                                         aTHX_
1815                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1816                                         cur->param.padoff
1817                                 );
1818                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1819
1820                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1821                         }
1822
1823                         if (!param_spec->slurpy.name) {
1824                                 if (spec->flags & FLAG_CHECK_NARGS) {
1825                                         /* croak if %{rest} */
1826                                         OP *xcroak, *cond, *keys, *msg;
1827
1828                                         keys = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1829                                         keys = newLISTOP(OP_SORT, 0, newOP(OP_PUSHMARK, 0), keys);
1830                                         {
1831                                                 OP *first, *mid, *last;
1832
1833                                                 last = keys;
1834
1835                                                 mid = mkconstpvs(", ");
1836                                                 mid->op_sibling = last;
1837
1838                                                 first = newOP(OP_PUSHMARK, 0);
1839
1840                                                 keys = newLISTOP(OP_JOIN, 0, first, mid);
1841                                                 keys->op_targ = pad_alloc(OP_JOIN, SVs_PADTMP);
1842                                                 ((LISTOP *)keys)->op_last = last;
1843                                         }
1844
1845                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": no such named parameter: ", SVfARG(declarator)));
1846                                         msg = newBINOP(OP_CONCAT, 0, msg, keys);
1847
1848                                         xcroak = newCVREF(
1849                                                 OPf_WANT_SCALAR,
1850                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1851                                         );
1852                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1853
1854                                         cond = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1855                                         xcroak = newCONDOP(0, cond, xcroak, NULL);
1856
1857                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, xcroak));
1858                                 } else {
1859                                         OP *clear;
1860
1861                                         clear = newASSIGNOP(
1862                                                 OPf_STACKED,
1863                                                 my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1864                                                 0,
1865                                                 newNULLLIST()
1866                                         );
1867
1868                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, clear));
1869                                 }
1870                         } else if (param_spec->slurpy.padoff != param_spec->rest_hash) {
1871                                 OP *var, *clear;
1872
1873                                 assert(SvPV_nolen(param_spec->slurpy.name)[0] == '@');
1874
1875                                 var = my_var_g(
1876                                         aTHX_
1877                                         OP_PADAV,
1878                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1879                                         param_spec->slurpy.padoff
1880                                 );
1881
1882                                 var = newASSIGNOP(OPf_STACKED, var, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1883
1884                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, var));
1885
1886                                 clear = newASSIGNOP(
1887                                         OPf_STACKED,
1888                                         my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1889                                         0,
1890                                         newNULLLIST()
1891                                 );
1892
1893                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, clear));
1894                         }
1895                 }
1896
1897                 if (spec->flags & FLAG_CHECK_TARGS) {
1898                         size_t i, lim, base;
1899
1900                         base = 1;
1901                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1902                                 Param *cur = &param_spec->positional_required.data[i];
1903
1904                                 if (cur->type) {
1905                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1906                                 }
1907                         }
1908                         base += i;
1909
1910                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1911                                 Param *cur = &param_spec->positional_optional.data[i].param;
1912
1913                                 if (cur->type) {
1914                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1915                                 }
1916                         }
1917                         base += i;
1918
1919                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1920                                 Param *cur = &param_spec->named_required.data[i];
1921
1922                                 if (cur->type) {
1923                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1924                                 }
1925                         }
1926                         base += i;
1927
1928                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1929                                 Param *cur = &param_spec->named_optional.data[i].param;
1930
1931                                 if (cur->type) {
1932                                         *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur)));
1933                                 }
1934                         }
1935                         base += i;
1936
1937                         if (param_spec->slurpy.type) {
1938                                 /* $type->valid($_) or croak $type->get_message($_) for @rest / values %rest */
1939                                 OP *body, *list, *loop;
1940
1941                                 body = mktypecheck(aTHX_ declarator, base, param_spec->slurpy.name, NOT_IN_PAD, param_spec->slurpy.type);
1942
1943                                 if (SvPV_nolen(param_spec->slurpy.name)[0] == '@') {
1944                                         list = my_var_g(aTHX_ OP_PADAV, 0, param_spec->slurpy.padoff);
1945                                 } else {
1946                                         list = my_var_g(aTHX_ OP_PADHV, 0, param_spec->slurpy.padoff);
1947                                         list = newUNOP(OP_VALUES, 0, list);
1948                                 }
1949
1950                                 loop = newFOROP(0, NULL, list, body, NULL);
1951
1952                                 *prelude_sentinel = op_append_list(OP_LINESEQ, *prelude_sentinel, newSTATEOP(0, NULL, loop));
1953                         }
1954                 }
1955         }
1956
1957         /* finally let perl parse the actual subroutine body */
1958         body = parse_block(0);
1959
1960         /* add '();' to make function return nothing by default */
1961         /* (otherwise the invisible parameter initialization can "leak" into
1962            the return value: fun ($x) {}->("asdf", 0) == 2) */
1963         if (*prelude_sentinel) {
1964                 body = newSTATEOP(0, NULL, body);
1965         }
1966
1967         body = op_append_list(OP_LINESEQ, *prelude_sentinel, body);
1968         *prelude_sentinel = NULL;
1969
1970         /* it's go time. */
1971         {
1972                 CV *cv;
1973                 OP *const attrs = *attrs_sentinel;
1974                 *attrs_sentinel = NULL;
1975
1976                 SvREFCNT_inc_simple_void(PL_compcv);
1977
1978                 /* close outer block: '}' */
1979                 S_block_end(aTHX_ save_ix, body);
1980
1981                 cv = newATTRSUB(
1982                         floor_ix,
1983                         saw_name ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(saw_name)) : NULL,
1984                         proto ? newSVOP(OP_CONST, 0, SvREFCNT_inc_simple_NN(proto)) : NULL,
1985                         attrs,
1986                         body
1987                 );
1988
1989                 register_info(aTHX_ PTR2UV(CvROOT(cv)), declarator, spec, param_spec);
1990
1991                 if (saw_name) {
1992                         *pop = newOP(OP_NULL, 0);
1993                         return KEYWORD_PLUGIN_STMT;
1994                 }
1995
1996                 *pop = newUNOP(
1997                         OP_REFGEN, 0,
1998                         newSVOP(
1999                                 OP_ANONCODE, 0,
2000                                 (SV *)cv
2001                         )
2002                 );
2003                 return KEYWORD_PLUGIN_EXPR;
2004         }
2005 }
2006
2007 static int my_keyword_plugin(pTHX_ char *keyword_ptr, STRLEN keyword_len, OP **op_ptr) {
2008         KWSpec spec;
2009         int ret;
2010         Sentinel sen = { NULL };
2011
2012         ENTER;
2013         SAVETMPS;
2014
2015         SAVEDESTRUCTOR_X(sentinel_clear_void, sen);
2016
2017         if (kw_flags(aTHX_ sen, keyword_ptr, keyword_len, &spec)) {
2018                 ret = parse_fun(aTHX_ sen, op_ptr, keyword_ptr, keyword_len, &spec);
2019         } else {
2020                 ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
2021         }
2022
2023         FREETMPS;
2024         LEAVE;
2025
2026         return ret;
2027 }
2028
2029 WARNINGS_RESET
2030
2031 MODULE = Function::Parameters   PACKAGE = Function::Parameters   PREFIX = fp_
2032 PROTOTYPES: ENABLE
2033
2034 UV
2035 fp__cv_root(sv)
2036         SV * sv
2037         PREINIT:
2038                 CV *xcv;
2039                 HV *hv;
2040                 GV *gv;
2041         CODE:
2042                 xcv = sv_2cv(sv, &hv, &gv, 0);
2043                 RETVAL = PTR2UV(xcv ? CvROOT(xcv) : NULL);
2044         OUTPUT:
2045                 RETVAL
2046
2047 BOOT:
2048 WARNINGS_ENABLE {
2049         HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
2050         /**/
2051         newCONSTSUB(stash, "FLAG_NAME_OK",      newSViv(FLAG_NAME_OK));
2052         newCONSTSUB(stash, "FLAG_ANON_OK",      newSViv(FLAG_ANON_OK));
2053         newCONSTSUB(stash, "FLAG_DEFAULT_ARGS", newSViv(FLAG_DEFAULT_ARGS));
2054         newCONSTSUB(stash, "FLAG_CHECK_NARGS",  newSViv(FLAG_CHECK_NARGS));
2055         newCONSTSUB(stash, "FLAG_INVOCANT",     newSViv(FLAG_INVOCANT));
2056         newCONSTSUB(stash, "FLAG_NAMED_PARAMS", newSViv(FLAG_NAMED_PARAMS));
2057         newCONSTSUB(stash, "FLAG_TYPES_OK",     newSViv(FLAG_TYPES_OK));
2058         newCONSTSUB(stash, "FLAG_CHECK_TARGS",  newSViv(FLAG_CHECK_TARGS));
2059         newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
2060         newCONSTSUB(stash, "HINTK_FLAGS_",   newSVpvs(HINTK_FLAGS_));
2061         newCONSTSUB(stash, "HINTK_SHIFT_",   newSVpvs(HINTK_SHIFT_));
2062         newCONSTSUB(stash, "HINTK_ATTRS_",   newSVpvs(HINTK_ATTRS_));
2063         /**/
2064         next_keyword_plugin = PL_keyword_plugin;
2065         PL_keyword_plugin = my_keyword_plugin;
2066 } WARNINGS_RESET