Parameters.xs

   1 /*
   2 Copyright 2012 Lukas Mai.
   3
   4 This program is free software; you can redistribute it and/or modify it
   5 under the terms of either: the GNU General Public License as published
   6 by the Free Software Foundation; or the Artistic License.
   7
   8 See http://dev.perl.org/licenses/ for more information.
   9  */
  10
  11 #ifdef __GNUC__
  12  #if (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) || __GNUC__ >= 5
  13   #define PRAGMA_GCC_(X) _Pragma(#X)
  14   #define PRAGMA_GCC(X) PRAGMA_GCC_(GCC X)
  15  #endif
  16 #endif
  17
  18 #ifndef PRAGMA_GCC
  19  #define PRAGMA_GCC(X)
  20 #endif
  21
  22 #ifdef DEVEL
  23  #define WARNINGS_RESET PRAGMA_GCC(diagnostic pop)
  24  #define WARNINGS_ENABLEW(X) PRAGMA_GCC(diagnostic warning #X)
  25  #define WARNINGS_ENABLE \
  26         WARNINGS_ENABLEW(-Wall) \
  27         WARNINGS_ENABLEW(-Wextra) \
  28         WARNINGS_ENABLEW(-Wundef) \
  29         /* WARNINGS_ENABLEW(-Wshadow) :-( */ \
  30         WARNINGS_ENABLEW(-Wbad-function-cast) \
  31         WARNINGS_ENABLEW(-Wcast-align) \
  32         WARNINGS_ENABLEW(-Wwrite-strings) \
  33         /* WARNINGS_ENABLEW(-Wnested-externs) wtf? */ \
  34         WARNINGS_ENABLEW(-Wstrict-prototypes) \
  35         WARNINGS_ENABLEW(-Wmissing-prototypes) \
  36         WARNINGS_ENABLEW(-Winline) \
  37         WARNINGS_ENABLEW(-Wdisabled-optimization)
  38
  39 #else
  40  #define WARNINGS_RESET
  41  #define WARNINGS_ENABLE
  42 #endif
  43
  44
  45 #define PERL_NO_GET_CONTEXT
  46 #include "EXTERN.h"
  47 #include "perl.h"
  48 #include "XSUB.h"
  49
  50 #include <string.h>
  51
  52
  53 WARNINGS_ENABLE
  54
  55
  56 #define HAVE_PERL_VERSION(R, V, S) \
  57         (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
  58
  59 #if HAVE_PERL_VERSION(5, 16, 0)
  60  #define IF_HAVE_PERL_5_16(YES, NO) YES
  61 #else
  62  #define IF_HAVE_PERL_5_16(YES, NO) NO
  63 #endif
  64
  65 #if 0
  66  #if HAVE_PERL_VERSION(5, 17, 6)
  67   #error "internal error: missing definition of KEY_my (your perl is too new)"
  68  #elif HAVE_PERL_VERSION(5, 15, 8)
  69   #define S_KEY_my 134
  70  #elif HAVE_PERL_VERSION(5, 15, 6)
  71   #define S_KEY_my 133
  72  #elif HAVE_PERL_VERSION(5, 15, 5)
  73   #define S_KEY_my 132
  74  #elif HAVE_PERL_VERSION(5, 13, 0)
  75   #define S_KEY_my 131
  76  #else
  77   #error "internal error: missing definition of KEY_my (your perl is too old)"
  78  #endif
  79 #endif
  80
  81
  82 #define MY_PKG "Function::Parameters"
  83
  84 #define HINTK_KEYWORDS MY_PKG "/keywords"
  85 #define HINTK_FLAGS_   MY_PKG "/flags:"
  86 #define HINTK_SHIFT_   MY_PKG "/shift:"
  87 #define HINTK_ATTRS_   MY_PKG "/attrs:"
  88
  89 #define DEFSTRUCT(T) typedef struct T T; struct T
  90
  91 #define UV_BITS (sizeof (UV) * CHAR_BIT)
  92
  93 enum {
  94         FLAG_NAME_OK      = 0x01,
  95         FLAG_ANON_OK      = 0x02,
  96         FLAG_DEFAULT_ARGS = 0x04,
  97         FLAG_CHECK_NARGS  = 0x08,
  98         FLAG_INVOCANT     = 0x10,
  99         FLAG_NAMED_PARAMS = 0x20,
 100         FLAG_TYPES_OK     = 0x40,
 101         FLAG_CHECK_TARGS  = 0x80
 102 };
 103
 104 DEFSTRUCT(KWSpec) {
 105         unsigned flags;
 106         SV *shift;
 107         SV *attrs;
 108 };
 109
 110 static int (*next_keyword_plugin)(pTHX_ char *, STRLEN, OP **);
 111
 112 DEFSTRUCT(Resource) {
 113         Resource *next;
 114         void *data;
 115         void (*destroy)(pTHX_ void *);
 116 };
 117
 118 typedef Resource *Sentinel[1];
 119
 120 static void sentinel_clear_void(pTHX_ void *p) {
 121         Resource **pp = p;
 122         while (*pp) {
 123                 Resource *cur = *pp;
 124                 if (cur->destroy) {
 125                         cur->destroy(aTHX_ cur->data);
 126                 }
 127                 cur->data = (void *)"no";
 128                 cur->destroy = NULL;
 129                 *pp = cur->next;
 130                 Safefree(cur);
 131         }
 132 }
 133
 134 static Resource *sentinel_register(Sentinel sen, void *data, void (*destroy)(pTHX_ void *)) {
 135         Resource *cur;
 136
 137         Newx(cur, 1, Resource);
 138         cur->data = data;
 139         cur->destroy = destroy;
 140         cur->next = *sen;
 141         *sen = cur;
 142
 143         return cur;
 144 }
 145
 146 static void sentinel_disarm(Resource *p) {
 147         p->destroy = NULL;
 148 }
 149
 150 static void my_sv_refcnt_dec_void(pTHX_ void *p) {
 151         SV *sv = p;
 152         SvREFCNT_dec(sv);
 153 }
 154
 155 static SV *sentinel_mortalize(Sentinel sen, SV *sv) {
 156         sentinel_register(sen, sv, my_sv_refcnt_dec_void);
 157         return sv;
 158 }
 159
 160 static int kw_flags(pTHX_ Sentinel sen, const char *kw_ptr, STRLEN kw_len, KWSpec *spec) {
 161         HV *hints;
 162         SV *sv, **psv;
 163         const char *p, *kw_active;
 164         STRLEN kw_active_len;
 165
 166         spec->flags = 0;
 167         spec->shift = sentinel_mortalize(sen, newSVpvs(""));
 168         spec->attrs = sentinel_mortalize(sen, newSVpvs(""));
 169
 170         if (!(hints = GvHV(PL_hintgv))) {
 171                 return FALSE;
 172         }
 173         if (!(psv = hv_fetchs(hints, HINTK_KEYWORDS, 0))) {
 174                 return FALSE;
 175         }
 176         sv = *psv;
 177         kw_active = SvPV(sv, kw_active_len);
 178         if (kw_active_len <= kw_len) {
 179                 return FALSE;
 180         }
 181         for (
 182                 p = kw_active;
 183                 (p = strchr(p, *kw_ptr)) &&
 184                 p < kw_active + kw_active_len - kw_len;
 185                 p++
 186         ) {
 187                 if (
 188                         (p == kw_active || p[-1] == ' ') &&
 189                         p[kw_len] == ' ' &&
 190                         memcmp(kw_ptr, p, kw_len) == 0
 191                 ) {
 192
 193 #define FETCH_HINTK_INTO(NAME, PTR, LEN, X) STMT_START { \
 194         const char *fk_ptr_; \
 195         STRLEN fk_len_; \
 196         SV *fk_sv_; \
 197         fk_sv_ = sentinel_mortalize(sen, newSVpvs(HINTK_ ## NAME)); \
 198         sv_catpvn(fk_sv_, PTR, LEN); \
 199         fk_ptr_ = SvPV(fk_sv_, fk_len_); \
 200         if (!((X) = hv_fetch(hints, fk_ptr_, fk_len_, 0))) { \
 201                 croak("%s: internal error: $^H{'%.*s'} not set", MY_PKG, (int)fk_len_, fk_ptr_); \
 202         } \
 203 } STMT_END
 204
 205                         FETCH_HINTK_INTO(FLAGS_, kw_ptr, kw_len, psv);
 206                         spec->flags = SvIV(*psv);
 207
 208                         FETCH_HINTK_INTO(SHIFT_, kw_ptr, kw_len, psv);
 209                         SvSetSV(spec->shift, *psv);
 210
 211                         FETCH_HINTK_INTO(ATTRS_, kw_ptr, kw_len, psv);
 212                         SvSetSV(spec->attrs, *psv);
 213
 214 #undef FETCH_HINTK_INTO
 215                         return TRUE;
 216                 }
 217         }
 218         return FALSE;
 219 }
 220
 221
 222 #if HAVE_PERL_VERSION(5, 17, 2)
 223  #define MY_OP_SLABBED(O) ((O)->op_slabbed)
 224 #else
 225  #define MY_OP_SLABBED(O) 0
 226 #endif
 227
 228 DEFSTRUCT(OpGuard) {
 229         OP *op;
 230         bool needs_freed;
 231 };
 232
 233 static void op_guard_init(OpGuard *p) {
 234         p->op = NULL;
 235         p->needs_freed = FALSE;
 236 }
 237
 238 static OpGuard op_guard_transfer(OpGuard *p) {
 239         OpGuard r = *p;
 240         op_guard_init(p);
 241         return r;
 242 }
 243
 244 static OP *op_guard_relinquish(OpGuard *p) {
 245         OP *o = p->op;
 246         op_guard_init(p);
 247         return o;
 248 }
 249
 250 static void op_guard_update(OpGuard *p, OP *o) {
 251         p->op = o;
 252         p->needs_freed = o && !MY_OP_SLABBED(o);
 253 }
 254
 255 static void op_guard_clear(pTHX_ OpGuard *p) {
 256         if (p->needs_freed) {
 257                 op_free(p->op);
 258         }
 259 }
 260
 261 static void free_op_guard_void(pTHX_ void *vp) {
 262         OpGuard *p = vp;
 263         op_guard_clear(aTHX_ p);
 264         Safefree(p);
 265 }
 266
 267 static void free_op_void(pTHX_ void *vp) {
 268         OP *p = vp;
 269         op_free(p);
 270 }
 271
 272 #define sv_eq_pvs(SV, S) my_sv_eq_pvn(aTHX_ SV, "" S "", sizeof (S) - 1)
 273
 274 static int my_sv_eq_pvn(pTHX_ SV *sv, const char *p, STRLEN n) {
 275         STRLEN sv_len;
 276         const char *sv_p = SvPV(sv, sv_len);
 277         return memcmp(sv_p, p, n) == 0;
 278 }
 279
 280
 281 #include "padop_on_crack.c.inc"
 282
 283
 284 enum {
 285         MY_ATTR_LVALUE = 0x01,
 286         MY_ATTR_METHOD = 0x02,
 287         MY_ATTR_SPECIAL = 0x04
 288 };
 289
 290 static void my_sv_cat_c(pTHX_ SV *sv, U32 c) {
 291         char ds[UTF8_MAXBYTES + 1], *d;
 292         d = (char *)uvchr_to_utf8((U8 *)ds, c);
 293         if (d - ds > 1) {
 294                 sv_utf8_upgrade(sv);
 295         }
 296         sv_catpvn(sv, ds, d - ds);
 297 }
 298
 299 static bool my_is_uni_xidfirst(pTHX_ UV c) {
 300         U8 tmpbuf[UTF8_MAXBYTES + 1];
 301         uvchr_to_utf8(tmpbuf, c);
 302         return is_utf8_xidfirst(tmpbuf);
 303 }
 304
 305 static bool my_is_uni_xidcont(pTHX_ UV c) {
 306         U8 tmpbuf[UTF8_MAXBYTES + 1];
 307         uvchr_to_utf8(tmpbuf, c);
 308         return is_utf8_xidcont(tmpbuf);
 309 }
 310
 311 static SV *my_scan_word(pTHX_ Sentinel sen, bool allow_package) {
 312         bool at_start, at_substart;
 313         I32 c;
 314         SV *sv = sentinel_mortalize(sen, newSVpvs(""));
 315         if (lex_bufutf8()) {
 316                 SvUTF8_on(sv);
 317         }
 318
 319         at_start = at_substart = TRUE;
 320         c = lex_peek_unichar(0);
 321
 322         while (c != -1) {
 323                 if (at_substart ? my_is_uni_xidfirst(aTHX_ c) : my_is_uni_xidcont(aTHX_ c)) {
 324                         lex_read_unichar(0);
 325                         my_sv_cat_c(aTHX_ sv, c);
 326                         at_substart = FALSE;
 327                         c = lex_peek_unichar(0);
 328                 } else if (allow_package && !at_substart && c == '\'') {
 329                         lex_read_unichar(0);
 330                         c = lex_peek_unichar(0);
 331                         if (!my_is_uni_xidfirst(aTHX_ c)) {
 332                                 lex_stuff_pvs("'", 0);
 333                                 break;
 334                         }
 335                         sv_catpvs(sv, "'");
 336                         at_substart = TRUE;
 337                 } else if (allow_package && (at_start || !at_substart) && c == ':') {
 338                         lex_read_unichar(0);
 339                         if (lex_peek_unichar(0) != ':') {
 340                                 lex_stuff_pvs(":", 0);
 341                                 break;
 342                         }
 343                         lex_read_unichar(0);
 344                         c = lex_peek_unichar(0);
 345                         if (!my_is_uni_xidfirst(aTHX_ c)) {
 346                                 lex_stuff_pvs("::", 0);
 347                                 break;
 348                         }
 349                         sv_catpvs(sv, "::");
 350                         at_substart = TRUE;
 351                 } else {
 352                         break;
 353                 }
 354                 at_start = FALSE;
 355         }
 356
 357         return SvCUR(sv) ? sv : NULL;
 358 }
 359
 360 static SV *my_scan_parens_tail(pTHX_ Sentinel sen, bool keep_backslash) {
 361         I32 c, nesting;
 362         SV *sv;
 363         line_t start;
 364
 365         start = CopLINE(PL_curcop);
 366
 367         sv = sentinel_mortalize(sen, newSVpvs(""));
 368         if (lex_bufutf8()) {
 369                 SvUTF8_on(sv);
 370         }
 371
 372         nesting = 0;
 373         for (;;) {
 374                 c = lex_read_unichar(0);
 375                 if (c == EOF) {
 376                         CopLINE_set(PL_curcop, start);
 377                         return NULL;
 378                 }
 379
 380                 if (c == '\\') {
 381                         c = lex_read_unichar(0);
 382                         if (c == EOF) {
 383                                 CopLINE_set(PL_curcop, start);
 384                                 return NULL;
 385                         }
 386                         if (keep_backslash || (c != '(' && c != ')')) {
 387                                 sv_catpvs(sv, "\\");
 388                         }
 389                 } else if (c == '(') {
 390                         nesting++;
 391                 } else if (c == ')') {
 392                         if (!nesting) {
 393                                 break;
 394                         }
 395                         nesting--;
 396                 }
 397
 398                 my_sv_cat_c(aTHX_ sv, c);
 399         }
 400
 401         return sv;
 402 }
 403
 404 static void my_check_prototype(pTHX_ Sentinel sen, const SV *declarator, SV *proto) {
 405         char *start, *r, *w, *end;
 406         STRLEN len;
 407
 408         /* strip spaces */
 409         start = SvPV(proto, len);
 410         end = start + len;
 411
 412         for (w = r = start; r < end; r++) {
 413                 if (!isSPACE(*r)) {
 414                         *w++ = *r;
 415                 }
 416         }
 417         *w = '\0';
 418         SvCUR_set(proto, w - start);
 419         end = w;
 420         len = end - start;
 421
 422         if (!ckWARN(WARN_ILLEGALPROTO)) {
 423                 return;
 424         }
 425
 426         /* check for bad characters */
 427         if (strspn(start, "$@%*;[]&\\_+") != len) {
 428                 SV *dsv = sentinel_mortalize(sen, newSVpvs(""));
 429                 warner(
 430                         packWARN(WARN_ILLEGALPROTO),
 431                         "Illegal character in prototype for %"SVf" : %s",
 432                         SVfARG(declarator),
 433                         SvUTF8(proto)
 434                                 ? sv_uni_display(
 435                                         dsv,
 436                                         proto,
 437                                         len,
 438                                         UNI_DISPLAY_ISPRINT
 439                                 )
 440                                 : pv_pretty(dsv, start, len, 60, NULL, NULL,
 441                                         PERL_PV_ESCAPE_NONASCII
 442                                 )
 443                 );
 444                 return;
 445         }
 446
 447         for (r = start; r < end; r++) {
 448                 switch (*r) {
 449                         default:
 450                                 warner(
 451                                         packWARN(WARN_ILLEGALPROTO),
 452                                         "Illegal character in prototype for %"SVf" : %s",
 453                                         SVfARG(declarator), r
 454                                 );
 455                                 return;
 456
 457                         case '_':
 458                                 if (r[1] && !strchr(";@%", *r)) {
 459                                         warner(
 460                                                 packWARN(WARN_ILLEGALPROTO),
 461                                                 "Illegal character after '_' in prototype for %"SVf" : %s",
 462                                                 SVfARG(declarator), r
 463                                         );
 464                                         return;
 465                                 }
 466                                 break;
 467
 468                         case '@':
 469                         case '%':
 470                                 if (r[1]) {
 471                                         warner(
 472                                                 packWARN(WARN_ILLEGALPROTO),
 473                                                 "prototype after '%c' for %"SVf": %s",
 474                                                 *r, SVfARG(declarator), r + 1
 475                                         );
 476                                         return;
 477                                 }
 478                                 break;
 479
 480                         case '\\':
 481                                 r++;
 482                                 if (strchr("$@%&*", *r)) {
 483                                         break;
 484                                 }
 485                                 if (*r == '[') {
 486                                         r++;
 487                                         for (; r < end && *r != ']'; r++) {
 488                                                 if (!strchr("$@%&*", *r)) {
 489                                                         break;
 490                                                 }
 491                                         }
 492                                         if (*r == ']' && r[-1] != '[') {
 493                                                 break;
 494                                         }
 495                                 }
 496                                 warner(
 497                                         packWARN(WARN_ILLEGALPROTO),
 498                                         "Illegal character after '\\' in prototype for %"SVf" : %s",
 499                                         SVfARG(declarator), r
 500                                 );
 501                                 return;
 502
 503                         case '$':
 504                         case '*':
 505                         case '&':
 506                         case ';':
 507                         case '+':
 508                                 break;
 509                 }
 510         }
 511 }
 512
 513 static SV *parse_type(pTHX_ Sentinel, const SV *);
 514
 515 static SV *parse_type_paramd(pTHX_ Sentinel sen, const SV *declarator) {
 516         I32 c;
 517         SV *t;
 518
 519         t = my_scan_word(aTHX_ sen, TRUE);
 520         lex_read_space(0);
 521
 522         c = lex_peek_unichar(0);
 523         if (c == '[') {
 524                 SV *u;
 525
 526                 lex_read_unichar(0);
 527                 lex_read_space(0);
 528                 my_sv_cat_c(aTHX_ t, c);
 529
 530                 u = parse_type(aTHX_ sen, declarator);
 531                 sv_catsv(t, u);
 532
 533                 c = lex_peek_unichar(0);
 534                 if (c != ']') {
 535                         croak("In %"SVf": missing ']' after '%"SVf"'", SVfARG(declarator), SVfARG(t));
 536                 }
 537                 lex_read_unichar(0);
 538                 lex_read_space(0);
 539
 540                 my_sv_cat_c(aTHX_ t, c);
 541         }
 542
 543         return t;
 544 }
 545
 546 static SV *parse_type(pTHX_ Sentinel sen, const SV *declarator) {
 547         I32 c;
 548         SV *t;
 549
 550         t = parse_type_paramd(aTHX_ sen, declarator);
 551
 552         c = lex_peek_unichar(0);
 553         while (c == '|') {
 554                 SV *u;
 555
 556                 lex_read_unichar(0);
 557                 lex_read_space(0);
 558
 559                 my_sv_cat_c(aTHX_ t, c);
 560                 u = parse_type_paramd(aTHX_ sen, declarator);
 561                 sv_catsv(t, u);
 562
 563                 c = lex_peek_unichar(0);
 564         }
 565
 566         return t;
 567 }
 568
 569 static SV *reify_type(pTHX_ Sentinel sen, const SV *declarator, SV *name) {
 570         SV *t;
 571         int n;
 572         dSP;
 573
 574         ENTER;
 575         SAVETMPS;
 576
 577         PUSHMARK(SP);
 578         EXTEND(SP, 1);
 579         PUSHs(name);
 580         PUTBACK;
 581
 582         n = call_pv("Moose::Util::TypeConstraints::find_or_create_isa_type_constraint", G_SCALAR);
 583         SPAGAIN;
 584
 585         assert(n == 1);
 586         /* don't warn about n being unused if assert() is compiled out */
 587         n = n;
 588
 589         t = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 590
 591         PUTBACK;
 592         FREETMPS;
 593         LEAVE;
 594
 595         if (!SvTRUE(t)) {
 596                 croak("In %"SVf": undefined type '%"SVf"'", SVfARG(declarator), SVfARG(name));
 597         }
 598
 599         return t;
 600 }
 601
 602
 603 DEFSTRUCT(Param) {
 604         SV *name;
 605         PADOFFSET padoff;
 606         SV *type;
 607 };
 608
 609 DEFSTRUCT(ParamInit) {
 610         Param param;
 611         OpGuard init;
 612 };
 613
 614 #define VEC(B) B ## _Vec
 615
 616 #define DEFVECTOR(B) DEFSTRUCT(VEC(B)) { \
 617         B (*data); \
 618         size_t used, size; \
 619 }
 620
 621 DEFVECTOR(Param);
 622 DEFVECTOR(ParamInit);
 623
 624 #define DEFVECTOR_INIT(N, B) static void N(VEC(B) *p) { \
 625         p->used = 0; \
 626         p->size = 23; \
 627         Newx(p->data, p->size, B); \
 628 } static void N(VEC(B) *)
 629
 630 DEFSTRUCT(ParamSpec) {
 631         Param invocant;
 632         VEC(Param) positional_required;
 633         VEC(ParamInit) positional_optional;
 634         VEC(Param) named_required;
 635         VEC(ParamInit) named_optional;
 636         Param slurpy;
 637         PADOFFSET rest_hash;
 638 };
 639
 640 DEFVECTOR_INIT(pv_init, Param);
 641 DEFVECTOR_INIT(piv_init, ParamInit);
 642
 643 static void p_init(Param *p) {
 644         p->name = NULL;
 645         p->padoff = NOT_IN_PAD;
 646         p->type = NULL;
 647 }
 648
 649 static void ps_init(ParamSpec *ps) {
 650         p_init(&ps->invocant);
 651         pv_init(&ps->positional_required);
 652         piv_init(&ps->positional_optional);
 653         pv_init(&ps->named_required);
 654         piv_init(&ps->named_optional);
 655         p_init(&ps->slurpy);
 656         ps->rest_hash = NOT_IN_PAD;
 657 }
 658
 659 #define DEFVECTOR_EXTEND(N, B) static B (*N(VEC(B) *p)) { \
 660         assert(p->used <= p->size); \
 661         if (p->used == p->size) { \
 662                 const size_t n = p->size / 2 * 3 + 1; \
 663                 Renew(p->data, n, B); \
 664                 p->size = n; \
 665         } \
 666         return &p->data[p->used]; \
 667 } static B (*N(VEC(B) *))
 668
 669 DEFVECTOR_EXTEND(pv_extend, Param);
 670 DEFVECTOR_EXTEND(piv_extend, ParamInit);
 671
 672 #define DEFVECTOR_CLEAR(N, B, F) static void N(pTHX_ VEC(B) *p) { \
 673         while (p->used) { \
 674                 p->used--; \
 675                 F(aTHX_ &p->data[p->used]); \
 676         } \
 677         Safefree(p->data); \
 678         p->data = NULL; \
 679         p->size = 0; \
 680 } static void N(pTHX_ VEC(B) *)
 681
 682 static void p_clear(pTHX_ Param *p) {
 683         p->name = NULL;
 684         p->padoff = NOT_IN_PAD;
 685         p->type = NULL;
 686 }
 687
 688 static void pi_clear(pTHX_ ParamInit *pi) {
 689         p_clear(aTHX_ &pi->param);
 690         op_guard_clear(aTHX_ &pi->init);
 691 }
 692
 693 DEFVECTOR_CLEAR(pv_clear, Param, p_clear);
 694 DEFVECTOR_CLEAR(piv_clear, ParamInit, pi_clear);
 695
 696 static void ps_clear(pTHX_ ParamSpec *ps) {
 697         p_clear(aTHX_ &ps->invocant);
 698
 699         pv_clear(aTHX_ &ps->positional_required);
 700         piv_clear(aTHX_ &ps->positional_optional);
 701
 702         pv_clear(aTHX_ &ps->named_required);
 703         piv_clear(aTHX_ &ps->named_optional);
 704
 705         p_clear(aTHX_ &ps->slurpy);
 706 }
 707
 708 static int ps_contains(pTHX_ const ParamSpec *ps, SV *sv) {
 709         size_t i, lim;
 710
 711         if (ps->invocant.name && sv_eq(sv, ps->invocant.name)) {
 712                 return 1;
 713         }
 714
 715         for (i = 0, lim = ps->positional_required.used; i < lim; i++) {
 716                 if (sv_eq(sv, ps->positional_required.data[i].name)) {
 717                         return 1;
 718                 }
 719         }
 720
 721         for (i = 0, lim = ps->positional_optional.used; i < lim; i++) {
 722                 if (sv_eq(sv, ps->positional_optional.data[i].param.name)) {
 723                         return 1;
 724                 }
 725         }
 726
 727         for (i = 0, lim = ps->named_required.used; i < lim; i++) {
 728                 if (sv_eq(sv, ps->named_required.data[i].name)) {
 729                         return 1;
 730                 }
 731         }
 732
 733         for (i = 0, lim = ps->named_optional.used; i < lim; i++) {
 734                 if (sv_eq(sv, ps->named_optional.data[i].param.name)) {
 735                         return 1;
 736                 }
 737         }
 738
 739         return 0;
 740 }
 741
 742 static void ps_free_void(pTHX_ void *p) {
 743         ps_clear(aTHX_ p);
 744         Safefree(p);
 745 }
 746
 747 static int args_min(pTHX_ const ParamSpec *ps, const KWSpec *ks) {
 748         int n = 0;
 749         if (!ps) {
 750                 return SvTRUE(ks->shift) ? 1 : 0;
 751         }
 752         if (ps->invocant.name) {
 753                 n++;
 754         }
 755         n += ps->positional_required.used;
 756         n += ps->named_required.used * 2;
 757         return n;
 758 }
 759
 760 static int args_max(const ParamSpec *ps) {
 761         int n = 0;
 762         if (!ps) {
 763                 return -1;
 764         }
 765         if (ps->invocant.name) {
 766                 n++;
 767         }
 768         n += ps->positional_required.used;
 769         n += ps->positional_optional.used;
 770         if (ps->named_required.used || ps->named_optional.used || ps->slurpy.name) {
 771                 n = -1;
 772         }
 773         return n;
 774 }
 775
 776 static size_t count_positional_params(const ParamSpec *ps) {
 777         return ps->positional_required.used + ps->positional_optional.used;
 778 }
 779
 780 static size_t count_named_params(const ParamSpec *ps) {
 781         return ps->named_required.used + ps->named_optional.used;
 782 }
 783
 784 static void my_require(pTHX_ const char *file) {
 785         require_pv(file);
 786         if (SvTRUE(ERRSV)) {
 787                 croak_sv(ERRSV);
 788         }
 789 }
 790
 791 static SV *my_eval(pTHX_ Sentinel sen, I32 floor, OP *op) {
 792         SV *sv;
 793         CV *cv;
 794         dSP;
 795
 796         cv = newATTRSUB(floor, NULL, NULL, NULL, op);
 797
 798         ENTER;
 799         SAVETMPS;
 800
 801         PUSHMARK(SP);
 802         call_sv((SV *)cv, G_SCALAR | G_NOARGS);
 803         SPAGAIN;
 804         sv = sentinel_mortalize(sen, SvREFCNT_inc(POPs));
 805
 806         PUTBACK;
 807         FREETMPS;
 808         LEAVE;
 809
 810         return sv;
 811 }
 812
 813 enum {
 814         PARAM_INVOCANT = 0x01,
 815         PARAM_NAMED    = 0x02
 816 };
 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, OpGuard *ginit, SV **ptype
 823 ) {
 824         I32 c;
 825         char sigil;
 826         SV *name;
 827
 828         assert(!ginit->op);
 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                         if (MY_OP_SLABBED(expr)) {
 850                                 expr_sentinel = NULL;
 851                         } else {
 852                                 expr_sentinel = sentinel_register(sen, expr, free_op_void);
 853                         }
 854
 855                         lex_read_space(0);
 856                         c = lex_peek_unichar(0);
 857                         if (c != ')') {
 858                                 croak("In %"SVf": missing ')' after type expression", SVfARG(declarator));
 859                         }
 860                         lex_read_unichar(0);
 861                         lex_read_space(0);
 862
 863                         SvREFCNT_inc_simple_void(PL_compcv);
 864                         if (expr_sentinel) {
 865                                 sentinel_disarm(expr_sentinel);
 866                         }
 867                         *ptype = my_eval(aTHX_ sen, floor, expr);
 868                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 869                         if (!sv_isobject(*ptype)) {
 870                                 croak("In %"SVf": (%"SVf") doesn't look like a type object", SVfARG(declarator), SVfARG(*ptype));
 871                         }
 872
 873                         c = lex_peek_unichar(0);
 874                 } else if (my_is_uni_xidfirst(aTHX_ c)) {
 875                         *ptype = parse_type(aTHX_ sen, declarator);
 876                         my_require(aTHX_ "Moose/Util/TypeConstraints.pm");
 877                         *ptype = reify_type(aTHX_ sen, declarator, *ptype);
 878
 879                         c = lex_peek_unichar(0);
 880                 }
 881         }
 882
 883         if (c == ':') {
 884                 lex_read_unichar(0);
 885                 lex_read_space(0);
 886
 887                 *pflags |= PARAM_NAMED;
 888
 889                 c = lex_peek_unichar(0);
 890         }
 891
 892         if (c == -1) {
 893                 croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 894         }
 895
 896         if (!(c == '$' || c == '@' || c == '%')) {
 897                 croak("In %"SVf": unexpected '%c' in parameter list (expecting a sigil)", SVfARG(declarator), (int)c);
 898         }
 899
 900         sigil = c;
 901
 902         lex_read_unichar(0);
 903         lex_read_space(0);
 904
 905         if (!(name = my_scan_word(aTHX_ sen, FALSE))) {
 906                 croak("In %"SVf": missing identifier after '%c'", SVfARG(declarator), sigil);
 907         }
 908         sv_insert(name, 0, 0, &sigil, 1);
 909         *pname = name;
 910
 911         lex_read_space(0);
 912         c = lex_peek_unichar(0);
 913
 914         if (c == '=') {
 915                 lex_read_unichar(0);
 916                 lex_read_space(0);
 917
 918
 919                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
 920                         param_spec->invocant.name = spec->shift;
 921                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
 922                 }
 923
 924                 op_guard_update(ginit, parse_termexpr(0));
 925
 926                 lex_read_space(0);
 927                 c = lex_peek_unichar(0);
 928         }
 929
 930         if (c == ':') {
 931                 *pflags |= PARAM_INVOCANT;
 932                 lex_read_unichar(0);
 933                 lex_read_space(0);
 934         } else if (c == ',') {
 935                 lex_read_unichar(0);
 936                 lex_read_space(0);
 937         } else if (c != ')') {
 938                 if (c == -1) {
 939                         croak("In %"SVf": unterminated parameter list", SVfARG(declarator));
 940                 }
 941                 croak("In %"SVf": unexpected '%c' in parameter list (expecting ',')", SVfARG(declarator), (int)c);
 942         }
 943
 944         return pad_add_name_sv(*pname, IF_HAVE_PERL_5_16(padadd_NO_DUP_CHECK, 0), NULL, NULL);
 945 }
 946
 947 static OP *my_var_g(pTHX_ I32 type, I32 flags, PADOFFSET padoff) {
 948         OP *var = newOP(type, flags);
 949         var->op_targ = padoff;
 950         return var;
 951 }
 952
 953 static OP *my_var(pTHX_ I32 flags, PADOFFSET padoff) {
 954         return my_var_g(aTHX_ OP_PADSV, flags, padoff);
 955 }
 956
 957 static OP *mkhvelem(pTHX_ PADOFFSET h, OP *k) {
 958         OP *hv = my_var_g(aTHX_ OP_PADHV, OPf_REF, h);
 959         return newBINOP(OP_HELEM, 0, hv, k);
 960 }
 961
 962 static OP *mkconstsv(pTHX_ SV *sv) {
 963         return newSVOP(OP_CONST, 0, sv);
 964 }
 965
 966 static OP *mkconstiv(pTHX_ IV i) {
 967         return mkconstsv(aTHX_ newSViv(i));
 968 }
 969
 970 static OP *mkconstpv(pTHX_ const char *p, size_t n) {
 971         return mkconstsv(aTHX_ newSVpv(p, n));
 972 }
 973
 974 #define mkconstpvs(S) mkconstpv(aTHX_ "" S "", sizeof S - 1)
 975
 976 static OP *mktypecheck(pTHX_ const SV *declarator, int nr, SV *name, PADOFFSET padoff, SV *type) {
 977         /* $type->check($value) or Carp::croak "...: " . $type->get_message($value) */
 978         OP *chk, *err, *msg, *xcroak;
 979
 980         err = mkconstsv(aTHX_ newSVpvf("In %"SVf": parameter %d (%"SVf"): ", SVfARG(declarator), nr, SVfARG(name)));
 981         {
 982                 OP *args = NULL;
 983
 984                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
 985                 args = op_append_elem(
 986                         OP_LIST, args,
 987                         padoff == NOT_IN_PAD
 988                                 ? S_newDEFSVOP(aTHX)
 989                                 : my_var(aTHX_ 0, padoff)
 990                 );
 991                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("get_message")));
 992
 993                 msg = args;
 994                 msg->op_type = OP_ENTERSUB;
 995                 msg->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
 996                 msg->op_flags |= OPf_STACKED;
 997         }
 998
 999         msg = newBINOP(OP_CONCAT, 0, err, msg);
1000
1001         xcroak = newCVREF(
1002                 OPf_WANT_SCALAR,
1003                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1004         );
1005         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1006
1007         {
1008                 OP *args = NULL;
1009
1010                 args = op_append_elem(OP_LIST, args, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(type)));
1011                 args = op_append_elem(
1012                         OP_LIST, args,
1013                         padoff == NOT_IN_PAD
1014                                 ? S_newDEFSVOP(aTHX)
1015                                 : my_var(aTHX_ 0, padoff)
1016                 );
1017                 args = op_append_elem(OP_LIST, args, newUNOP(OP_METHOD, 0, mkconstpvs("check")));
1018
1019                 chk = args;
1020                 chk->op_type = OP_ENTERSUB;
1021                 chk->op_ppaddr = PL_ppaddr[OP_ENTERSUB];
1022                 chk->op_flags |= OPf_STACKED;
1023         }
1024
1025         chk = newLOGOP(OP_OR, 0, chk, xcroak);
1026         return chk;
1027 }
1028
1029 static OP *mktypecheckp(pTHX_ const SV *declarator, int nr, const Param *param) {
1030         return mktypecheck(aTHX_ declarator, nr, param->name, param->padoff, param->type);
1031 }
1032
1033 static void register_info(pTHX_ UV key, SV *declarator, const KWSpec *kws, const ParamSpec *ps) {
1034         dSP;
1035
1036         ENTER;
1037         SAVETMPS;
1038
1039         PUSHMARK(SP);
1040         EXTEND(SP, 10);
1041
1042         /* 0 */ {
1043                 mPUSHu(key);
1044         }
1045         /* 1 */ {
1046                 size_t n;
1047                 char *p = SvPV(declarator, n);
1048                 char *q = memchr(p, ' ', n);
1049                 mPUSHp(p, q ? (size_t)(q - p) : n);
1050         }
1051         if (!ps) {
1052                 if (SvTRUE(kws->shift)) {
1053                         PUSHs(kws->shift);
1054                 } else {
1055                         PUSHmortal;
1056                 }
1057                 PUSHmortal;
1058                 mPUSHs(newRV_noinc((SV *)newAV()));
1059                 mPUSHs(newRV_noinc((SV *)newAV()));
1060                 mPUSHs(newRV_noinc((SV *)newAV()));
1061                 mPUSHs(newRV_noinc((SV *)newAV()));
1062                 mPUSHp("@_", 2);
1063                 PUSHmortal;
1064         } else {
1065                 /* 2, 3 */ {
1066                         if (ps->invocant.name) {
1067                                 PUSHs(ps->invocant.name);
1068                                 if (ps->invocant.type) {
1069                                         PUSHs(ps->invocant.type);
1070                                 } else {
1071                                         PUSHmortal;
1072                                 }
1073                         } else {
1074                                 PUSHmortal;
1075                                 PUSHmortal;
1076                         }
1077                 }
1078                 /* 4 */ {
1079                         size_t i, lim;
1080                         AV *av;
1081
1082                         lim = ps->positional_required.used;
1083
1084                         av = newAV();
1085                         if (lim) {
1086                                 av_extend(av, (lim - 1) * 2);
1087                                 for (i = 0; i < lim; i++) {
1088                                         Param *cur = &ps->positional_required.data[i];
1089                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1090                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1091                                 }
1092                         }
1093
1094                         mPUSHs(newRV_noinc((SV *)av));
1095                 }
1096                 /* 5 */ {
1097                         size_t i, lim;
1098                         AV *av;
1099
1100                         lim = ps->positional_optional.used;
1101
1102                         av = newAV();
1103                         if (lim) {
1104                                 av_extend(av, (lim - 1) * 2);
1105                                 for (i = 0; i < lim; i++) {
1106                                         Param *cur = &ps->positional_optional.data[i].param;
1107                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1108                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1109                                 }
1110                         }
1111
1112                         mPUSHs(newRV_noinc((SV *)av));
1113                 }
1114                 /* 6 */ {
1115                         size_t i, lim;
1116                         AV *av;
1117
1118                         lim = ps->named_required.used;
1119
1120                         av = newAV();
1121                         if (lim) {
1122                                 av_extend(av, (lim - 1) * 2);
1123                                 for (i = 0; i < lim; i++) {
1124                                         Param *cur = &ps->named_required.data[i];
1125                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1126                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1127                                 }
1128                         }
1129
1130                         mPUSHs(newRV_noinc((SV *)av));
1131                 }
1132                 /* 7 */ {
1133                         size_t i, lim;
1134                         AV *av;
1135
1136                         lim = ps->named_optional.used;
1137
1138                         av = newAV();
1139                         if (lim) {
1140                                 av_extend(av, (lim - 1) * 2);
1141                                 for (i = 0; i < lim; i++) {
1142                                         Param *cur = &ps->named_optional.data[i].param;
1143                                         av_push(av, SvREFCNT_inc_simple_NN(cur->name));
1144                                         av_push(av, cur->type ? SvREFCNT_inc_simple_NN(cur->type) : &PL_sv_undef);
1145                                 }
1146                         }
1147
1148                         mPUSHs(newRV_noinc((SV *)av));
1149                 }
1150                 /* 8, 9 */ {
1151                         if (ps->slurpy.name) {
1152                                 PUSHs(ps->slurpy.name);
1153                                 if (ps->slurpy.type) {
1154                                         PUSHs(ps->slurpy.type);
1155                                 } else {
1156                                         PUSHmortal;
1157                                 }
1158                         } else {
1159                                 PUSHmortal;
1160                                 PUSHmortal;
1161                         }
1162                 }
1163         }
1164         PUTBACK;
1165
1166         call_pv(MY_PKG "::_register_info", G_VOID);
1167
1168         FREETMPS;
1169         LEAVE;
1170 }
1171
1172 static int parse_fun(pTHX_ Sentinel sen, OP **pop, const char *keyword_ptr, STRLEN keyword_len, const KWSpec *spec) {
1173         ParamSpec *param_spec;
1174         SV *declarator;
1175         I32 floor_ix;
1176         int save_ix;
1177         SV *saw_name;
1178         OpGuard *prelude_sentinel;
1179         SV *proto;
1180         OpGuard *attrs_sentinel;
1181         OP *body;
1182         unsigned builtin_attrs;
1183         I32 c;
1184
1185         declarator = sentinel_mortalize(sen, newSVpvn(keyword_ptr, keyword_len));
1186
1187         lex_read_space(0);
1188
1189         builtin_attrs = 0;
1190
1191         /* function name */
1192         saw_name = NULL;
1193         if ((spec->flags & FLAG_NAME_OK) && (saw_name = my_scan_word(aTHX_ sen, TRUE))) {
1194
1195                 if (PL_parser->expect != XSTATE) {
1196                         /* bail out early so we don't predeclare $saw_name */
1197                         croak("In %"SVf": I was expecting a function body, not \"%"SVf"\"", SVfARG(declarator), SVfARG(saw_name));
1198                 }
1199
1200                 sv_catpvs(declarator, " ");
1201                 sv_catsv(declarator, saw_name);
1202
1203                 if (
1204                         sv_eq_pvs(saw_name, "BEGIN") ||
1205                         sv_eq_pvs(saw_name, "END") ||
1206                         sv_eq_pvs(saw_name, "INIT") ||
1207                         sv_eq_pvs(saw_name, "CHECK") ||
1208                         sv_eq_pvs(saw_name, "UNITCHECK")
1209                 ) {
1210                         builtin_attrs |= MY_ATTR_SPECIAL;
1211                 }
1212
1213                 lex_read_space(0);
1214         } else if (!(spec->flags & FLAG_ANON_OK)) {
1215                 croak("I was expecting a function name, not \"%.*s\"", (int)(PL_parser->bufend - PL_parser->bufptr), PL_parser->bufptr);
1216         } else {
1217                 sv_catpvs(declarator, " (anon)");
1218         }
1219
1220         /* we're a subroutine declaration */
1221         floor_ix = start_subparse(FALSE, saw_name ? 0 : CVf_ANON);
1222         SAVEFREESV(PL_compcv);
1223
1224         /* create outer block: '{' */
1225         save_ix = S_block_start(aTHX_ TRUE);
1226
1227         /* initialize synthetic optree */
1228         Newx(prelude_sentinel, 1, OpGuard);
1229         op_guard_init(prelude_sentinel);
1230         sentinel_register(sen, prelude_sentinel, free_op_guard_void);
1231
1232         /* parameters */
1233         param_spec = NULL;
1234
1235         c = lex_peek_unichar(0);
1236         if (c == '(') {
1237                 OpGuard *init_sentinel;
1238
1239                 Newx(init_sentinel, 1, OpGuard);
1240                 op_guard_init(init_sentinel);
1241                 sentinel_register(sen, init_sentinel, free_op_guard_void);
1242
1243                 Newx(param_spec, 1, ParamSpec);
1244                 ps_init(param_spec);
1245                 sentinel_register(sen, param_spec, ps_free_void);
1246
1247                 lex_read_unichar(0);
1248                 lex_read_space(0);
1249
1250                 while ((c = lex_peek_unichar(0)) != ')') {
1251                         int flags;
1252                         SV *name, *type;
1253                         char sigil;
1254                         PADOFFSET padoff;
1255
1256                         padoff = parse_param(aTHX_ sen, declarator, spec, param_spec, &flags, &name, init_sentinel, &type);
1257
1258                         S_intro_my(aTHX);
1259
1260                         sigil = SvPV_nolen(name)[0];
1261
1262                         /* internal consistency */
1263                         if (flags & PARAM_NAMED) {
1264                                 if (flags & PARAM_INVOCANT) {
1265                                         croak("In %"SVf": invocant %"SVf" can't be a named parameter", SVfARG(declarator), SVfARG(name));
1266                                 }
1267                                 if (sigil != '$') {
1268                                         croak("In %"SVf": named parameter %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1269                                 }
1270                         } else if (flags & PARAM_INVOCANT) {
1271                                 if (init_sentinel->op) {
1272                                         croak("In %"SVf": invocant %"SVf" can't have a default value", SVfARG(declarator), SVfARG(name));
1273                                 }
1274                                 if (sigil != '$') {
1275                                         croak("In %"SVf": invocant %"SVf" can't be a%s", SVfARG(declarator), SVfARG(name), sigil == '@' ? "n array" : " hash");
1276                                 }
1277                         } else if (sigil != '$' && init_sentinel->op) {
1278                                 croak("In %"SVf": %s %"SVf" can't have a default value", SVfARG(declarator), sigil == '@' ? "array" : "hash", SVfARG(name));
1279                         }
1280
1281                         /* external constraints */
1282                         if (param_spec->slurpy.name) {
1283                                 croak("In %"SVf": I was expecting \")\" after \"%"SVf"\", not \"%"SVf"\"", SVfARG(declarator), SVfARG(param_spec->slurpy.name), SVfARG(name));
1284                         }
1285                         if (sigil != '$') {
1286                                 assert(!init_sentinel->op);
1287                                 param_spec->slurpy.name = name;
1288                                 param_spec->slurpy.padoff = padoff;
1289                                 param_spec->slurpy.type = type;
1290                                 continue;
1291                         }
1292
1293                         if (!(flags & PARAM_NAMED) && count_named_params(param_spec)) {
1294                                 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));
1295                         }
1296
1297                         if (flags & PARAM_INVOCANT) {
1298                                 if (param_spec->invocant.name) {
1299                                         croak("In %"SVf": invalid double invocants %"SVf", %"SVf"", SVfARG(declarator), SVfARG(param_spec->invocant.name), SVfARG(name));
1300                                 }
1301                                 if (count_positional_params(param_spec) || count_named_params(param_spec)) {
1302                                         croak("In %"SVf": invocant %"SVf" must be first in parameter list", SVfARG(declarator), SVfARG(name));
1303                                 }
1304                                 if (!(spec->flags & FLAG_INVOCANT)) {
1305                                         croak("In %"SVf": invocant %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1306                                 }
1307                                 param_spec->invocant.name = name;
1308                                 param_spec->invocant.padoff = padoff;
1309                                 param_spec->invocant.type = type;
1310                                 continue;
1311                         }
1312
1313                         if (init_sentinel->op && !(spec->flags & FLAG_DEFAULT_ARGS)) {
1314                                 croak("In %"SVf": default argument for %"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1315                         }
1316
1317                         if (ps_contains(aTHX_ param_spec, name)) {
1318                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(name));
1319                         }
1320
1321                         if (flags & PARAM_NAMED) {
1322                                 if (!(spec->flags & FLAG_NAMED_PARAMS)) {
1323                                         croak("In %"SVf": named parameter :%"SVf" not allowed here", SVfARG(declarator), SVfARG(name));
1324                                 }
1325
1326                                 if (init_sentinel->op) {
1327                                         ParamInit *pi = piv_extend(&param_spec->named_optional);
1328                                         pi->param.name = name;
1329                                         pi->param.padoff = padoff;
1330                                         pi->param.type = type;
1331                                         pi->init = op_guard_transfer(init_sentinel);
1332                                         param_spec->named_optional.used++;
1333                                 } else {
1334                                         Param *p;
1335
1336                                         if (param_spec->positional_optional.used) {
1337                                                 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));
1338                                         }
1339
1340                                         p = pv_extend(&param_spec->named_required);
1341                                         p->name = name;
1342                                         p->padoff = padoff;
1343                                         p->type = type;
1344                                         param_spec->named_required.used++;
1345                                 }
1346                         } else {
1347                                 if (init_sentinel->op || param_spec->positional_optional.used) {
1348                                         ParamInit *pi = piv_extend(&param_spec->positional_optional);
1349                                         pi->param.name = name;
1350                                         pi->param.padoff = padoff;
1351                                         pi->param.type = type;
1352                                         pi->init = op_guard_transfer(init_sentinel);
1353                                         param_spec->positional_optional.used++;
1354                                 } else {
1355                                         Param *p = pv_extend(&param_spec->positional_required);
1356                                         p->name = name;
1357                                         p->padoff = padoff;
1358                                         p->type = type;
1359                                         param_spec->positional_required.used++;
1360                                 }
1361                         }
1362
1363                 }
1364                 lex_read_unichar(0);
1365                 lex_read_space(0);
1366
1367                 if (!param_spec->invocant.name && SvTRUE(spec->shift)) {
1368                         if (ps_contains(aTHX_ param_spec, spec->shift)) {
1369                                 croak("In %"SVf": %"SVf" can't appear twice in the same parameter list", SVfARG(declarator), SVfARG(spec->shift));
1370                         }
1371
1372                         param_spec->invocant.name = spec->shift;
1373                         param_spec->invocant.padoff = pad_add_name_sv(param_spec->invocant.name, 0, NULL, NULL);
1374                 }
1375         }
1376
1377         /* prototype */
1378         proto = NULL;
1379         c = lex_peek_unichar(0);
1380         if (c == ':') {
1381                 lex_read_unichar(0);
1382                 lex_read_space(0);
1383
1384                 c = lex_peek_unichar(0);
1385                 if (c != '(') {
1386                         lex_stuff_pvs(":", 0);
1387                         c = ':';
1388                 } else {
1389                         lex_read_unichar(0);
1390                         if (!(proto = my_scan_parens_tail(aTHX_ sen, FALSE))) {
1391                                 croak("In %"SVf": prototype not terminated", SVfARG(declarator));
1392                         }
1393                         my_check_prototype(aTHX_ sen, declarator, proto);
1394                         lex_read_space(0);
1395                         c = lex_peek_unichar(0);
1396                         if (!(c == ':' || c == '{')) {
1397                                 lex_stuff_pvs(":", 0);
1398                                 c = ':';
1399                         }
1400                 }
1401         }
1402
1403         /* attributes */
1404         Newx(attrs_sentinel, 1, OpGuard);
1405         op_guard_init(attrs_sentinel);
1406         sentinel_register(sen, attrs_sentinel, free_op_guard_void);
1407
1408         if (c == ':' || c == '{') /* '}' - hi, vim */ {
1409
1410                 /* kludge default attributes in */
1411                 if (SvTRUE(spec->attrs) && SvPV_nolen(spec->attrs)[0] == ':') {
1412                         lex_stuff_sv(spec->attrs, 0);
1413                         c = ':';
1414                 }
1415
1416                 if (c == ':') {
1417                         lex_read_unichar(0);
1418                         lex_read_space(0);
1419                         c = lex_peek_unichar(0);
1420
1421                         for (;;) {
1422                                 SV *attr;
1423
1424                                 if (!(attr = my_scan_word(aTHX_ sen, FALSE))) {
1425                                         break;
1426                                 }
1427
1428                                 lex_read_space(0);
1429                                 c = lex_peek_unichar(0);
1430
1431                                 if (c != '(') {
1432                                         if (sv_eq_pvs(attr, "lvalue")) {
1433                                                 builtin_attrs |= MY_ATTR_LVALUE;
1434                                                 attr = NULL;
1435                                         } else if (sv_eq_pvs(attr, "method")) {
1436                                                 builtin_attrs |= MY_ATTR_METHOD;
1437                                                 attr = NULL;
1438                                         }
1439                                 } else {
1440                                         SV *sv;
1441                                         lex_read_unichar(0);
1442                                         if (!(sv = my_scan_parens_tail(aTHX_ sen, TRUE))) {
1443                                                 croak("In %"SVf": unterminated attribute parameter in attribute list", SVfARG(declarator));
1444                                         }
1445                                         sv_catpvs(attr, "(");
1446                                         sv_catsv(attr, sv);
1447                                         sv_catpvs(attr, ")");
1448
1449                                         lex_read_space(0);
1450                                         c = lex_peek_unichar(0);
1451                                 }
1452
1453                                 if (attr) {
1454                                         op_guard_update(attrs_sentinel, op_append_elem(OP_LIST, attrs_sentinel->op, mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(attr))));
1455                                 }
1456
1457                                 if (c == ':') {
1458                                         lex_read_unichar(0);
1459                                         lex_read_space(0);
1460                                         c = lex_peek_unichar(0);
1461                                 }
1462                         }
1463                 }
1464         }
1465
1466         /* body */
1467         if (c != '{') /* '}' - hi, vim */ {
1468                 croak("In %"SVf": I was expecting a function body, not \"%c\"", SVfARG(declarator), (int)c);
1469         }
1470
1471         /* surprise predeclaration! */
1472         if (saw_name) {
1473                 /* 'sub NAME (PROTO);' to make name/proto known to perl before it
1474                    starts parsing the body */
1475                 const I32 sub_ix = start_subparse(FALSE, 0);
1476                 SAVEFREESV(PL_compcv);
1477
1478                 SvREFCNT_inc_simple_void(PL_compcv);
1479
1480                 newATTRSUB(
1481                         sub_ix,
1482                         mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(saw_name)),
1483                         proto ? mkconstsv(aTHX_ SvREFCNT_inc_simple_NN(proto)) : NULL,
1484                         NULL,
1485                         NULL
1486                 );
1487         }
1488
1489         if (builtin_attrs & MY_ATTR_LVALUE) {
1490                 CvLVALUE_on(PL_compcv);
1491         }
1492         if (builtin_attrs & MY_ATTR_METHOD) {
1493                 CvMETHOD_on(PL_compcv);
1494         }
1495         if (builtin_attrs & MY_ATTR_SPECIAL) {
1496                 CvSPECIAL_on(PL_compcv);
1497         }
1498
1499         /* check number of arguments */
1500         if (spec->flags & FLAG_CHECK_NARGS) {
1501                 int amin, amax;
1502
1503                 amin = args_min(aTHX_ param_spec, spec);
1504                 if (amin > 0) {
1505                         OP *chk, *cond, *err, *xcroak;
1506
1507                         err = mkconstsv(aTHX_ newSVpvf("Not enough arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amin));
1508                         err = newBINOP(
1509                                 OP_CONCAT, 0,
1510                                 err,
1511                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1512                         );
1513                         err = newBINOP(
1514                                 OP_CONCAT, 0,
1515                                 err,
1516                                 mkconstpvs(")")
1517                         );
1518
1519                         xcroak = newCVREF(OPf_WANT_SCALAR,
1520                                           newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV)));
1521                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1522                                       op_append_elem(OP_LIST, err, xcroak));
1523
1524                         cond = newBINOP(OP_LT, 0,
1525                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1526                                         mkconstiv(aTHX_ amin));
1527                         chk = newLOGOP(OP_AND, 0, cond, err);
1528
1529                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1530                 }
1531
1532                 amax = args_max(param_spec);
1533                 if (amax >= 0) {
1534                         OP *chk, *cond, *err, *xcroak;
1535
1536                         err = mkconstsv(aTHX_ newSVpvf("Too many arguments for %"SVf" (expected %d, got ", SVfARG(declarator), amax));
1537                         err = newBINOP(
1538                                 OP_CONCAT, 0,
1539                                 err,
1540                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv))
1541                         );
1542                         err = newBINOP(
1543                                 OP_CONCAT, 0,
1544                                 err,
1545                                 mkconstpvs(")")
1546                         );
1547
1548                         xcroak = newCVREF(
1549                                 OPf_WANT_SCALAR,
1550                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1551                         );
1552                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1553                         op_append_elem(OP_LIST, err, xcroak));
1554
1555                         cond = newBINOP(
1556                                 OP_GT, 0,
1557                                 newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1558                                 mkconstiv(aTHX_ amax)
1559                         );
1560                         chk = newLOGOP(OP_AND, 0, cond, err);
1561
1562                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1563                 }
1564
1565                 if (param_spec && (count_named_params(param_spec) || (param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%'))) {
1566                         OP *chk, *cond, *err, *xcroak;
1567                         const UV fixed = count_positional_params(param_spec) + !!param_spec->invocant.name;
1568
1569                         err = mkconstsv(aTHX_ newSVpvf("Odd number of paired arguments for %"SVf"", SVfARG(declarator)));
1570
1571                         xcroak = newCVREF(
1572                                 OPf_WANT_SCALAR,
1573                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1574                         );
1575                         err = newUNOP(OP_ENTERSUB, OPf_STACKED,
1576                         op_append_elem(OP_LIST, err, xcroak));
1577
1578                         cond = newBINOP(OP_GT, 0,
1579                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1580                                         mkconstiv(aTHX_ fixed));
1581                         cond = newLOGOP(OP_AND, 0,
1582                                         cond,
1583                                         newBINOP(OP_MODULO, 0,
1584                                                  fixed
1585                                                  ? newBINOP(OP_SUBTRACT, 0,
1586                                                             newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1587                                                             mkconstiv(aTHX_ fixed))
1588                                                  : newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1589                                                  mkconstiv(aTHX_ 2)));
1590                         chk = newLOGOP(OP_AND, 0, cond, err);
1591
1592                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, chk)));
1593                 }
1594         }
1595
1596         if (!param_spec) {
1597                 /* my $invocant = shift; */
1598                 if (SvTRUE(spec->shift)) {
1599                         OP *var;
1600
1601                         var = my_var(
1602                                 aTHX_
1603                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1604                                 pad_add_name_sv(spec->shift, 0, NULL, NULL)
1605                         );
1606                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1607
1608                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1609                 }
1610         } else {
1611                 /* my $invocant = shift; */
1612                 if (param_spec->invocant.name) {
1613                         OP *var;
1614
1615                         var = my_var(
1616                                 aTHX_
1617                                 OPf_MOD | (OPpLVAL_INTRO << 8),
1618                                 param_spec->invocant.padoff
1619                         );
1620                         var = newASSIGNOP(OPf_STACKED, var, 0, newOP(OP_SHIFT, 0));
1621
1622                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1623
1624                         if (param_spec->invocant.type && (spec->flags & FLAG_CHECK_TARGS)) {
1625                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, 0, &param_spec->invocant))));
1626                         }
1627                 }
1628
1629                 /* my (...) = @_; */
1630                 {
1631                         OP *lhs;
1632                         size_t i, lim;
1633
1634                         lhs = NULL;
1635
1636                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1637                                 OP *const var = my_var(
1638                                         aTHX_
1639                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1640                                         param_spec->positional_required.data[i].padoff
1641                                 );
1642                                 lhs = op_append_elem(OP_LIST, lhs, var);
1643                         }
1644
1645                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1646                                 OP *const var = my_var(
1647                                         aTHX_
1648                                         OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1649                                         param_spec->positional_optional.data[i].param.padoff
1650                                 );
1651                                 lhs = op_append_elem(OP_LIST, lhs, var);
1652                         }
1653
1654                         {
1655                                 PADOFFSET padoff;
1656                                 I32 type;
1657                                 bool slurpy_hash;
1658
1659                                 /*
1660                                  * cases:
1661                                  *  1) no named params
1662                                  *   1.1) slurpy
1663                                  *       => put it in
1664                                  *   1.2) no slurpy
1665                                  *       => nop
1666                                  *  2) named params
1667                                  *   2.1) no slurpy
1668                                  *       => synthetic %{rest}
1669                                  *   2.2) slurpy is a hash
1670                                  *       => put it in
1671                                  *   2.3) slurpy is an array
1672                                  *       => synthetic %{rest}
1673                                  *          remember to declare array later
1674                                  */
1675
1676                                 slurpy_hash = param_spec->slurpy.name && SvPV_nolen(param_spec->slurpy.name)[0] == '%';
1677                                 if (!count_named_params(param_spec)) {
1678                                         if (param_spec->slurpy.name) {
1679                                                 padoff = param_spec->slurpy.padoff;
1680                                                 type = slurpy_hash ? OP_PADHV : OP_PADAV;
1681                                         } else {
1682                                                 padoff = NOT_IN_PAD;
1683                                                 type = OP_PADSV;
1684                                         }
1685                                 } else if (slurpy_hash) {
1686                                         padoff = param_spec->slurpy.padoff;
1687                                         type = OP_PADHV;
1688                                 } else {
1689                                         padoff = param_spec->rest_hash = pad_add_name_pvs("%{rest}", 0, NULL, NULL);
1690                                         type = OP_PADHV;
1691                                 }
1692
1693                                 if (padoff != NOT_IN_PAD) {
1694                                         OP *const var = my_var_g(
1695                                                 aTHX_
1696                                                 type,
1697                                                 OPf_WANT_LIST | (OPpLVAL_INTRO << 8),
1698                                                 padoff
1699                                         );
1700
1701                                         lhs = op_append_elem(OP_LIST, lhs, var);
1702
1703                                         if (type == OP_PADHV) {
1704                                                 param_spec->rest_hash = padoff;
1705                                         }
1706                                 }
1707                         }
1708
1709                         if (lhs) {
1710                                 OP *rhs;
1711                                 lhs->op_flags |= OPf_PARENS;
1712                                 rhs = newAVREF(newGVOP(OP_GV, 0, PL_defgv));
1713
1714                                 op_guard_update(prelude_sentinel, op_append_list(
1715                                         OP_LINESEQ, prelude_sentinel->op,
1716                                         newSTATEOP(
1717                                                 0, NULL,
1718                                                 newASSIGNOP(OPf_STACKED, lhs, 0, rhs)
1719                                         )
1720                                 ));
1721                         }
1722                 }
1723
1724                 /* default positional arguments */
1725                 {
1726                         size_t i, lim, req;
1727                         OP *nest;
1728
1729                         nest = NULL;
1730
1731                         req = param_spec->positional_required.used;
1732                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1733                                 ParamInit *cur = &param_spec->positional_optional.data[i];
1734                                 OP *var, *cond;
1735
1736                                 cond = newBINOP(
1737                                         OP_LT, 0,
1738                                         newAVREF(newGVOP(OP_GV, 0, PL_defgv)),
1739                                         mkconstiv(aTHX_ req + i + 1)
1740                                 );
1741
1742                                 var = my_var(aTHX_ 0, cur->param.padoff);
1743
1744                                 nest = op_append_list(
1745                                         OP_LINESEQ, nest,
1746                                         newASSIGNOP(OPf_STACKED, var, 0, op_guard_relinquish(&cur->init))
1747                                 );
1748                                 nest = newCONDOP(
1749                                         0,
1750                                         cond,
1751                                         nest,
1752                                         NULL
1753                                 );
1754                         }
1755
1756                         op_guard_update(prelude_sentinel, op_append_list(
1757                                 OP_LINESEQ, prelude_sentinel->op,
1758                                 nest
1759                         ));
1760                 }
1761
1762                 /* named parameters */
1763                 if (count_named_params(param_spec)) {
1764                         size_t i, lim;
1765
1766                         assert(param_spec->rest_hash != NOT_IN_PAD);
1767
1768                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1769                                 Param *cur = &param_spec->named_required.data[i];
1770                                 size_t n;
1771                                 char *p = SvPV(cur->name, n);
1772                                 OP *var, *cond;
1773
1774                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1775
1776                                 if (spec->flags & FLAG_CHECK_NARGS) {
1777                                         OP *xcroak, *msg;
1778
1779                                         var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1780                                         var = newUNOP(OP_DELETE, 0, var);
1781
1782                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": missing named parameter: %.*s", SVfARG(declarator), (int)(n - 1), p + 1));
1783                                         xcroak = newCVREF(
1784                                                 OPf_WANT_SCALAR,
1785                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1786                                         );
1787                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1788
1789                                         cond = newUNOP(OP_EXISTS, 0, cond);
1790
1791                                         cond = newCONDOP(0, cond, var, xcroak);
1792                                 }
1793
1794                                 var = my_var(
1795                                         aTHX_
1796                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1797                                         cur->padoff
1798                                 );
1799                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1800
1801                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1802                         }
1803
1804                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1805                                 ParamInit *cur = &param_spec->named_optional.data[i];
1806                                 size_t n;
1807                                 char *p = SvPV(cur->param.name, n);
1808                                 OP *var, *cond;
1809
1810                                 var = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1811                                 var = newUNOP(OP_DELETE, 0, var);
1812
1813                                 cond = mkhvelem(aTHX_ param_spec->rest_hash, mkconstpv(aTHX_ p + 1, n - 1));
1814                                 cond = newUNOP(OP_EXISTS, 0, cond);
1815
1816                                 cond = newCONDOP(0, cond, var, op_guard_relinquish(&cur->init));
1817
1818                                 var = my_var(
1819                                         aTHX_
1820                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1821                                         cur->param.padoff
1822                                 );
1823                                 var = newASSIGNOP(OPf_STACKED, var, 0, cond);
1824
1825                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1826                         }
1827
1828                         if (!param_spec->slurpy.name) {
1829                                 if (spec->flags & FLAG_CHECK_NARGS) {
1830                                         /* croak if %{rest} */
1831                                         OP *xcroak, *cond, *keys, *msg;
1832
1833                                         keys = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1834                                         keys = newLISTOP(OP_SORT, 0, newOP(OP_PUSHMARK, 0), keys);
1835                                         {
1836                                                 OP *first, *mid, *last;
1837
1838                                                 last = keys;
1839
1840                                                 mid = mkconstpvs(", ");
1841                                                 mid->op_sibling = last;
1842
1843                                                 first = newOP(OP_PUSHMARK, 0);
1844
1845                                                 keys = newLISTOP(OP_JOIN, 0, first, mid);
1846                                                 keys->op_targ = pad_alloc(OP_JOIN, SVs_PADTMP);
1847                                                 ((LISTOP *)keys)->op_last = last;
1848                                         }
1849
1850                                         msg = mkconstsv(aTHX_ newSVpvf("In %"SVf": no such named parameter: ", SVfARG(declarator)));
1851                                         msg = newBINOP(OP_CONCAT, 0, msg, keys);
1852
1853                                         xcroak = newCVREF(
1854                                                 OPf_WANT_SCALAR,
1855                                                 newGVOP(OP_GV, 0, gv_fetchpvs("Carp::croak", 0, SVt_PVCV))
1856                                         );
1857                                         xcroak = newUNOP(OP_ENTERSUB, OPf_STACKED, op_append_elem(OP_LIST, msg, xcroak));
1858
1859                                         cond = newUNOP(OP_KEYS, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1860                                         xcroak = newCONDOP(0, cond, xcroak, NULL);
1861
1862                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, xcroak)));
1863                                 } else {
1864                                         OP *clear;
1865
1866                                         clear = newASSIGNOP(
1867                                                 OPf_STACKED,
1868                                                 my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1869                                                 0,
1870                                                 newNULLLIST()
1871                                         );
1872
1873                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, clear)));
1874                                 }
1875                         } else if (param_spec->slurpy.padoff != param_spec->rest_hash) {
1876                                 OP *var, *clear;
1877
1878                                 assert(SvPV_nolen(param_spec->slurpy.name)[0] == '@');
1879
1880                                 var = my_var_g(
1881                                         aTHX_
1882                                         OP_PADAV,
1883                                         OPf_MOD | (OPpLVAL_INTRO << 8),
1884                                         param_spec->slurpy.padoff
1885                                 );
1886
1887                                 var = newASSIGNOP(OPf_STACKED, var, 0, my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash));
1888
1889                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, var)));
1890
1891                                 clear = newASSIGNOP(
1892                                         OPf_STACKED,
1893                                         my_var_g(aTHX_ OP_PADHV, 0, param_spec->rest_hash),
1894                                         0,
1895                                         newNULLLIST()
1896                                 );
1897
1898                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, clear)));
1899                         }
1900                 }
1901
1902                 if (spec->flags & FLAG_CHECK_TARGS) {
1903                         size_t i, lim, base;
1904
1905                         base = 1;
1906                         for (i = 0, lim = param_spec->positional_required.used; i < lim; i++) {
1907                                 Param *cur = &param_spec->positional_required.data[i];
1908
1909                                 if (cur->type) {
1910                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1911                                 }
1912                         }
1913                         base += i;
1914
1915                         for (i = 0, lim = param_spec->positional_optional.used; i < lim; i++) {
1916                                 Param *cur = &param_spec->positional_optional.data[i].param;
1917
1918                                 if (cur->type) {
1919                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1920                                 }
1921                         }
1922                         base += i;
1923
1924                         for (i = 0, lim = param_spec->named_required.used; i < lim; i++) {
1925                                 Param *cur = &param_spec->named_required.data[i];
1926
1927                                 if (cur->type) {
1928                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1929                                 }
1930                         }
1931                         base += i;
1932
1933                         for (i = 0, lim = param_spec->named_optional.used; i < lim; i++) {
1934                                 Param *cur = &param_spec->named_optional.data[i].param;
1935
1936                                 if (cur->type) {
1937                                         op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, mktypecheckp(aTHX_ declarator, base + i, cur))));
1938                                 }
1939                         }
1940                         base += i;
1941
1942                         if (param_spec->slurpy.type) {
1943                                 /* $type->valid($_) or croak $type->get_message($_) for @rest / values %rest */
1944                                 OP *check, *list, *loop;
1945
1946                                 check = mktypecheck(aTHX_ declarator, base, param_spec->slurpy.name, NOT_IN_PAD, param_spec->slurpy.type);
1947
1948                                 if (SvPV_nolen(param_spec->slurpy.name)[0] == '@') {
1949                                         list = my_var_g(aTHX_ OP_PADAV, 0, param_spec->slurpy.padoff);
1950                                 } else {
1951                                         list = my_var_g(aTHX_ OP_PADHV, 0, param_spec->slurpy.padoff);
1952                                         list = newUNOP(OP_VALUES, 0, list);
1953                                 }
1954
1955                                 loop = newFOROP(0, NULL, list, check, NULL);
1956
1957                                 op_guard_update(prelude_sentinel, op_append_list(OP_LINESEQ, prelude_sentinel->op, newSTATEOP(0, NULL, loop)));
1958                         }
1959                 }
1960         }
1961
1962         /* finally let perl parse the actual subroutine body */
1963         body = parse_block(0);
1964
1965         /* add '();' to make function return nothing by default */
1966         /* (otherwise the invisible parameter initialization can "leak" into
1967            the return value: fun ($x) {}->("asdf", 0) == 2) */
1968         if (prelude_sentinel->op) {
1969                 body = newSTATEOP(0, NULL, body);
1970         }
1971
1972         body = op_append_list(OP_LINESEQ, op_guard_relinquish(prelude_sentinel), body);
1973
1974         /* it's go time. */
1975         {
1976                 CV *cv;
1977                 OP *const attrs = op_guard_relinquish(attrs_sentinel);
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                 if (cv) {
1993                         register_info(aTHX_ PTR2UV(CvROOT(cv)), declarator, spec, param_spec);
1994                 }
1995
1996                 if (saw_name) {
1997                         *pop = newOP(OP_NULL, 0);
1998                         return KEYWORD_PLUGIN_STMT;
1999                 }
2000
2001                 *pop = newUNOP(
2002                         OP_REFGEN, 0,
2003                         newSVOP(
2004                                 OP_ANONCODE, 0,
2005                                 (SV *)cv
2006                         )
2007                 );
2008                 return KEYWORD_PLUGIN_EXPR;
2009         }
2010 }
2011
2012 static int my_keyword_plugin(pTHX_ char *keyword_ptr, STRLEN keyword_len, OP **op_ptr) {
2013         KWSpec spec;
2014         int ret;
2015         Sentinel sen = { NULL };
2016
2017         ENTER;
2018         SAVETMPS;
2019
2020         SAVEDESTRUCTOR_X(sentinel_clear_void, sen);
2021
2022         if (kw_flags(aTHX_ sen, keyword_ptr, keyword_len, &spec)) {
2023                 ret = parse_fun(aTHX_ sen, op_ptr, keyword_ptr, keyword_len, &spec);
2024         } else {
2025                 ret = next_keyword_plugin(aTHX_ keyword_ptr, keyword_len, op_ptr);
2026         }
2027
2028         FREETMPS;
2029         LEAVE;
2030
2031         return ret;
2032 }
2033
2034 WARNINGS_RESET
2035
2036 MODULE = Function::Parameters   PACKAGE = Function::Parameters   PREFIX = fp_
2037 PROTOTYPES: ENABLE
2038
2039 UV
2040 fp__cv_root(sv)
2041         SV * sv
2042         PREINIT:
2043                 CV *xcv;
2044                 HV *hv;
2045                 GV *gv;
2046         CODE:
2047                 xcv = sv_2cv(sv, &hv, &gv, 0);
2048                 RETVAL = PTR2UV(xcv ? CvROOT(xcv) : NULL);
2049         OUTPUT:
2050                 RETVAL
2051
2052 BOOT:
2053 WARNINGS_ENABLE {
2054         HV *const stash = gv_stashpvs(MY_PKG, GV_ADD);
2055         /**/
2056         newCONSTSUB(stash, "FLAG_NAME_OK",      newSViv(FLAG_NAME_OK));
2057         newCONSTSUB(stash, "FLAG_ANON_OK",      newSViv(FLAG_ANON_OK));
2058         newCONSTSUB(stash, "FLAG_DEFAULT_ARGS", newSViv(FLAG_DEFAULT_ARGS));
2059         newCONSTSUB(stash, "FLAG_CHECK_NARGS",  newSViv(FLAG_CHECK_NARGS));
2060         newCONSTSUB(stash, "FLAG_INVOCANT",     newSViv(FLAG_INVOCANT));
2061         newCONSTSUB(stash, "FLAG_NAMED_PARAMS", newSViv(FLAG_NAMED_PARAMS));
2062         newCONSTSUB(stash, "FLAG_TYPES_OK",     newSViv(FLAG_TYPES_OK));
2063         newCONSTSUB(stash, "FLAG_CHECK_TARGS",  newSViv(FLAG_CHECK_TARGS));
2064         newCONSTSUB(stash, "HINTK_KEYWORDS", newSVpvs(HINTK_KEYWORDS));
2065         newCONSTSUB(stash, "HINTK_FLAGS_",   newSVpvs(HINTK_FLAGS_));
2066         newCONSTSUB(stash, "HINTK_SHIFT_",   newSVpvs(HINTK_SHIFT_));
2067         newCONSTSUB(stash, "HINTK_ATTRS_",   newSVpvs(HINTK_ATTRS_));
2068         /**/
2069         next_keyword_plugin = PL_keyword_plugin;
2070         PL_keyword_plugin = my_keyword_plugin;
2071 } WARNINGS_RESET