[p5sagit/Devel-Declare.git] / Declare.xs

#define PERL_CORE
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#undef printf
#include "stolen_chunk_of_toke.c"
#include <stdio.h>
#include <string.h>

#define DD_HAS_TRAITS
#if 0
#define DD_DEBUG
#endif

#define DD_HANDLE_NAME 1
#define DD_HANDLE_PROTO 2
#define DD_HANDLE_PACKAGE 8

#ifdef DD_DEBUG
#define DD_DEBUG_S printf("Buffer: %s\n", s);
#else
#define DD_DEBUG_S
#endif

#define LEX_NORMAL    10
#define LEX_INTERPNORMAL   9

/* placeholders for PL_check entries we wrap */

STATIC OP *(*dd_old_ck_rv2cv)(pTHX_ OP *op);
STATIC OP *(*dd_old_ck_lineseq)(pTHX_ OP *op);

/* flag to trigger removal of temporary declaree sub */

static int in_declare = 0;

/* replacement PL_check rv2cv entry */

STATIC OP *dd_ck_rv2cv(pTHX_ OP *o) {
  OP* kid;
  char* s;
  char* save_s;
  char tmpbuf[sizeof PL_tokenbuf];
  char found_name[sizeof PL_tokenbuf];
  char* found_proto = NULL, *found_traits = NULL;
  STRLEN len = 0;
  HV *stash;
  HV* is_declarator;
  SV** is_declarator_pack_ref;
  HV* is_declarator_pack_hash;
  SV** is_declarator_flag_ref;
  int dd_flags;
  char* cb_args[6];
  dSP; /* define stack pointer for later call stuff */
  char* retstr;
  STRLEN n_a; /* for POPpx */

  o = dd_old_ck_rv2cv(aTHX_ o); /* let the original do its job */

  if (in_declare) {
    cb_args[0] = NULL;
#ifdef DD_DEBUG
    printf("Deconstructing declare\n");
    printf("PL_bufptr: %s\n", PL_bufptr);
    printf("bufend at: %i\n", PL_bufend - PL_bufptr);
    printf("linestr: %s\n", SvPVX(PL_linestr));
    printf("linestr len: %i\n", PL_bufend - SvPVX(PL_linestr));
#endif
    call_argv("Devel::Declare::done_declare", G_VOID|G_DISCARD, cb_args);
    in_declare--;
#ifdef DD_DEBUG
    printf("PL_bufptr: %s\n", PL_bufptr);
    printf("bufend at: %i\n", PL_bufend - PL_bufptr);
    printf("linestr: %s\n", SvPVX(PL_linestr));
    printf("linestr len: %i\n", PL_bufend - SvPVX(PL_linestr));
    printf("actual len: %i\n", strlen(PL_bufptr));
#endif
    return o;
  }

  kid = cUNOPo->op_first;

  if (kid->op_type != OP_GV) /* not a GV so ignore */
    return o;

  if (PL_lex_state != LEX_NORMAL && PL_lex_state != LEX_INTERPNORMAL)
    return o; /* not lexing? */

  stash = GvSTASH(kGVOP_gv);

#ifdef DD_DEBUG
  printf("Checking GV %s -> %s\n", HvNAME(stash), GvNAME(kGVOP_gv));
#endif

  is_declarator = get_hv("Devel::Declare::declarators", FALSE);

  if (!is_declarator)
    return o;

  is_declarator_pack_ref = hv_fetch(is_declarator, HvNAME(stash),
                             strlen(HvNAME(stash)), FALSE);

  if (!is_declarator_pack_ref || !SvROK(*is_declarator_pack_ref))
    return o; /* not a hashref */

  is_declarator_pack_hash = (HV*) SvRV(*is_declarator_pack_ref);

  is_declarator_flag_ref = hv_fetch(is_declarator_pack_hash, GvNAME(kGVOP_gv),
                                strlen(GvNAME(kGVOP_gv)), FALSE);

  /* requires SvIOK as well as TRUE since flags not being an int is useless */

  if (!is_declarator_flag_ref
        || !SvIOK(*is_declarator_flag_ref) 
        || !SvTRUE(*is_declarator_flag_ref))
    return o;

  dd_flags = SvIVX(*is_declarator_flag_ref);

#ifdef DD_DEBUG
  printf("dd_flags are: %i\n", dd_flags);
#endif

  s = PL_bufptr; /* copy the current buffer pointer */

  DD_DEBUG_S

#ifdef DD_DEBUG
  printf("PL_tokenbuf: %s\n", PL_tokenbuf);
#endif

  /*
   *   buffer will be at the beginning of the declarator, -unless- the
   *   declarator is at EOL in which case it'll be the next useful line
   *   so we don't short-circuit out if we don't find the declarator
   */

  while (s < PL_bufend && isSPACE(*s)) s++;
  if (memEQ(s, PL_tokenbuf, strlen(PL_tokenbuf)))
    s += strlen(PL_tokenbuf);

  DD_DEBUG_S

  if (dd_flags & DD_HANDLE_NAME) {

    /* find next word */

    s = skipspace(s);

    DD_DEBUG_S

    /* arg 4 is allow_package */

    s = scan_word(s, tmpbuf, sizeof tmpbuf, dd_flags & DD_HANDLE_PACKAGE, &len);

    DD_DEBUG_S

    if (len) {
      strcpy(found_name, tmpbuf);
#ifdef DD_DEBUG
      printf("Found %s\n", found_name);
#endif
    }
  }

  if (dd_flags & DD_HANDLE_PROTO) {

    s = skipspace(s);

    if (*s == '(') { /* found a prototype-ish thing */
      save_s = s;
      s = scan_str(s, FALSE, FALSE); /* no keep_quoted, no keep_delims */
#ifdef DD_HAS_TRAITS
      {
          char *traitstart = s = skipspace(s);

          while (*s && *s != '{') ++s;
          if (*s) {
              int tlen = s - traitstart;
              Newx(found_traits, tlen+1, char);
              Copy(traitstart, found_traits, tlen, char);
              found_traits[tlen] = 0;
#ifdef DD_DEBUG
              printf("found traits..... (%s)\n", found_traits);
#endif
          }
      }
#endif
      
      if (SvPOK(PL_lex_stuff)) {
#ifdef DD_DEBUG
        printf("Found proto %s\n", SvPVX(PL_lex_stuff));
#endif
        found_proto = SvPVX(PL_lex_stuff);
        if (len) /* foo name () => foo name  X, only foo parsed so works */
          *save_s++ = ' ';
        else /* foo () => foo =X, TOKEN('&') won't handle foo X */
          *save_s++ = '=';
        *save_s++ = 'X';
        while (save_s < s) {
          *save_s++ = ' ';
        }
#ifdef DD_DEBUG
        printf("Curbuf %s\n", PL_bufptr);
#endif
      }
    }
  }

  if (!len)
    found_name[0] = 0;

#ifdef DD_DEBUG
  printf("Calling init_declare\n");
#endif
  cb_args[0] = HvNAME(stash);
  cb_args[1] = GvNAME(kGVOP_gv);
  cb_args[2] = HvNAME(PL_curstash);
  cb_args[3] = found_name;
  cb_args[4] = found_proto;
  cb_args[5] = found_traits;
  cb_args[6] = NULL;

  if (len && found_proto)
    in_declare = 2;
  else if (len || found_proto)
    in_declare = 1;
  if (found_proto)
    PL_lex_stuff = Nullsv;
  s = skipspace(s);
#ifdef DD_DEBUG
  printf("cur buf: %s\n", s);
  printf("bufend at: %i\n", PL_bufend - s);
  printf("linestr: %s\n", SvPVX(PL_linestr));
  printf("linestr len: %i\n", PL_bufend - SvPVX(PL_linestr));
#endif
  if (*s++ == '{') {
    call_argv("Devel::Declare::init_declare", G_SCALAR, cb_args);
    SPAGAIN;
    retstr = POPpx;
    PUTBACK;
    if (retstr && strlen(retstr)) {
      const char* old_start = SvPVX(PL_linestr);
      int start_diff;
      const int old_len = SvCUR(PL_linestr);
#ifdef DD_DEBUG
      printf("Got string %s\n", retstr);
#endif
      SvGROW(PL_linestr, (STRLEN)(old_len + strlen(retstr)));
      if (start_diff = SvPVX(PL_linestr) - old_start) {
#ifdef DD_DEBUG
        printf("linestr realloc'ed, moving stuff about by %i\n", start_diff);
#endif
        s += start_diff;
        PL_linestart += start_diff;
        PL_bufptr += start_diff;
        PL_bufend += start_diff;
        PL_oldbufptr += start_diff;
        PL_oldoldbufptr += start_diff;
        if (PL_last_lop)
          PL_last_lop += start_diff;
        if (PL_last_uni)
          PL_last_uni += start_diff;
      }
      memmove(s+strlen(retstr), s, (PL_bufend - s)+1);
      memmove(s, retstr, strlen(retstr));
      SvCUR_set(PL_linestr, old_len + strlen(retstr));
      PL_bufend += strlen(retstr);
#ifdef DD_DEBUG
  printf("cur buf: %s\n", s);
  printf("PL_bufptr: %s\n", PL_bufptr);
  printf("bufend at: %i\n", PL_bufend - s);
  printf("linestr: %s\n", SvPVX(PL_linestr));
  printf("linestr len: %i\n", PL_bufend - SvPVX(PL_linestr));
  printf("tokenbuf now: %s\n", PL_tokenbuf);
#endif
    }
  } else {
    call_argv("Devel::Declare::init_declare", G_VOID|G_DISCARD, cb_args);
  }
  return o;
}

STATIC OP *dd_ck_lineseq(pTHX_ OP *o) {
  AV* pad_inject_list;
  SV** to_inject_ref;
  int i, pad_inject_list_last;

  o = dd_old_ck_lineseq(aTHX_ o);

  pad_inject_list = get_av("Devel::Declare::next_pad_inject", FALSE);
  if (!pad_inject_list)
    return o;

  pad_inject_list_last = av_len(pad_inject_list);

  if (pad_inject_list_last == -1)
    return o;

  for (i = 0; i <= pad_inject_list_last; i++) {
    to_inject_ref = av_fetch(pad_inject_list, i, FALSE);
    if (to_inject_ref && SvPOK(*to_inject_ref)) {
#ifdef DD_DEBUG
  printf("Injecting %s into pad\n", SvPVX(*to_inject_ref));
#endif
      allocmy(SvPVX(*to_inject_ref));
    }
  }

  av_clear(pad_inject_list);

  return o;
}

static int initialized = 0;

MODULE = Devel::Declare  PACKAGE = Devel::Declare

PROTOTYPES: DISABLE

void
setup()
  CODE:
  if (!initialized++) {
    dd_old_ck_rv2cv = PL_check[OP_RV2CV];
    PL_check[OP_RV2CV] = dd_ck_rv2cv;
    dd_old_ck_lineseq = PL_check[OP_LINESEQ];
    PL_check[OP_LINESEQ] = dd_ck_lineseq;
  }

void
teardown()
  CODE:
  /* ensure we only uninit when number of teardown calls matches 
     number of setup calls */
  if (initialized && !--initialized) {
    PL_check[OP_RV2CV] = dd_old_ck_rv2cv;
  }
Commit	Line	Data
94caac6e	1	#define PERL_CORE
94caac6e	2	#define PERL_NO_GET_CONTEXT
94caac6e	3	#include "EXTERN.h"
	4	#include "perl.h"
	5	#include "XSUB.h"
	6	#undef printf
e807ee50	7	#include "stolen_chunk_of_toke.c"
94caac6e	8	#include <stdio.h>
	9	#include <string.h>
	10
0f070758	11	#define DD_HAS_TRAITS
53e3ab32	12	#if 0
	13	#define DD_DEBUG
	14	#endif
c630715a	15
0ba8c7aa	16	#define DD_HANDLE_NAME 1
0ba8c7aa	17	#define DD_HANDLE_PROTO 2
15d0d014	18	#define DD_HANDLE_PACKAGE 8
0ba8c7aa	19
c630715a	20	#ifdef DD_DEBUG
	21	#define DD_DEBUG_S printf("Buffer: %s\n", s);
	22	#else
	23	#define DD_DEBUG_S
	24	#endif
	25
94caac6e	26	#define LEX_NORMAL 10
	27	#define LEX_INTERPNORMAL 9
	28
	29	/* placeholders for PL_check entries we wrap */
	30
	31	STATIC OP (dd_old_ck_rv2cv)(pTHX_ OP *op);
53e3ab32	32	STATIC OP (dd_old_ck_lineseq)(pTHX_ OP *op);
94caac6e	33
	34	/* flag to trigger removal of temporary declaree sub */
	35
	36	static int in_declare = 0;
	37
	38	/* replacement PL_check rv2cv entry */
	39
	40	STATIC OP dd_ck_rv2cv(pTHX_ OP o) {
	41	OP* kid;
	42	char* s;
0ba8c7aa	43	char* save_s;
94caac6e	44	char tmpbuf[sizeof PL_tokenbuf];
0ba8c7aa	45	char found_name[sizeof PL_tokenbuf];
0f070758	46	char* found_proto = NULL, *found_traits = NULL;
0ba8c7aa	47	STRLEN len = 0;
94caac6e	48	HV *stash;
	49	HV* is_declarator;
	50	SV** is_declarator_pack_ref;
	51	HV* is_declarator_pack_hash;
	52	SV** is_declarator_flag_ref;
0ba8c7aa	53	int dd_flags;
9026391e	54	char* cb_args[6];
53e3ab32	55	dSP; /* define stack pointer for later call stuff */
	56	char* retstr;
	57	STRLEN n_a; /* for POPpx */
94caac6e	58
	59	o = dd_old_ck_rv2cv(aTHX_ o); /* let the original do its job */
	60
	61	if (in_declare) {
	62	cb_args[0] = NULL;
dcca2c59	63	#ifdef DD_DEBUG
	64	printf("Deconstructing declare\n");
	65	printf("PL_bufptr: %s\n", PL_bufptr);
	66	printf("bufend at: %i\n", PL_bufend - PL_bufptr);
	67	printf("linestr: %s\n", SvPVX(PL_linestr));
	68	printf("linestr len: %i\n", PL_bufend - SvPVX(PL_linestr));
	69	#endif
94caac6e	70	call_argv("Devel::Declare::done_declare", G_VOID\|G_DISCARD, cb_args);
0ba8c7aa	71	in_declare--;
dcca2c59	72	#ifdef DD_DEBUG
	73	printf("PL_bufptr: %s\n", PL_bufptr);
	74	printf("bufend at: %i\n", PL_bufend - PL_bufptr);
	75	printf("linestr: %s\n", SvPVX(PL_linestr));
	76	printf("linestr len: %i\n", PL_bufend - SvPVX(PL_linestr));
	77	printf("actual len: %i\n", strlen(PL_bufptr));
	78	#endif
94caac6e	79	return o;
	80	}
	81
	82	kid = cUNOPo->op_first;
	83
	84	if (kid->op_type != OP_GV) /* not a GV so ignore */
	85	return o;
	86
	87	if (PL_lex_state != LEX_NORMAL && PL_lex_state != LEX_INTERPNORMAL)
	88	return o; /* not lexing? */
	89
	90	stash = GvSTASH(kGVOP_gv);
	91
c630715a	92	#ifdef DD_DEBUG
	93	printf("Checking GV %s -> %s\n", HvNAME(stash), GvNAME(kGVOP_gv));
	94	#endif
94caac6e	95
	96	is_declarator = get_hv("Devel::Declare::declarators", FALSE);
	97
	98	if (!is_declarator)
	99	return o;
	100
	101	is_declarator_pack_ref = hv_fetch(is_declarator, HvNAME(stash),
	102	strlen(HvNAME(stash)), FALSE);
	103
	104	if (!is_declarator_pack_ref \|\| !SvROK(*is_declarator_pack_ref))
	105	return o; /* not a hashref */
	106
	107	is_declarator_pack_hash = (HV) SvRV(is_declarator_pack_ref);
	108
	109	is_declarator_flag_ref = hv_fetch(is_declarator_pack_hash, GvNAME(kGVOP_gv),
	110	strlen(GvNAME(kGVOP_gv)), FALSE);
	111
0ba8c7aa	112	/* requires SvIOK as well as TRUE since flags not being an int is useless */
	113
	114	if (!is_declarator_flag_ref
	115	\|\| !SvIOK(*is_declarator_flag_ref)
	116	\|\| !SvTRUE(*is_declarator_flag_ref))
94caac6e	117	return o;
94caac6e	118
0ba8c7aa	119	dd_flags = SvIVX(*is_declarator_flag_ref);
	120
	121	#ifdef DD_DEBUG
	122	printf("dd_flags are: %i\n", dd_flags);
	123	#endif
	124
94caac6e	125	s = PL_bufptr; /* copy the current buffer pointer */
94caac6e	126
c630715a	127	DD_DEBUG_S
	128
	129	#ifdef DD_DEBUG
0ba8c7aa	130	printf("PL_tokenbuf: %s\n", PL_tokenbuf);
c630715a	131	#endif
	132
	133	/*
	134	* buffer will be at the beginning of the declarator, -unless- the
	135	* declarator is at EOL in which case it'll be the next useful line
	136	* so we don't short-circuit out if we don't find the declarator
	137	*/
	138
94caac6e	139	while (s < PL_bufend && isSPACE(*s)) s++;
	140	if (memEQ(s, PL_tokenbuf, strlen(PL_tokenbuf)))
	141	s += strlen(PL_tokenbuf);
c630715a	142
c630715a	143	DD_DEBUG_S
94caac6e	144
0ba8c7aa	145	if (dd_flags & DD_HANDLE_NAME) {
94caac6e	146
0ba8c7aa	147	/* find next word */
94caac6e	148
0ba8c7aa	149	s = skipspace(s);
c630715a	150
0ba8c7aa	151	DD_DEBUG_S
94caac6e	152
15d0d014	153	/* arg 4 is allow_package */
94caac6e	154
15d0d014	155	s = scan_word(s, tmpbuf, sizeof tmpbuf, dd_flags & DD_HANDLE_PACKAGE, &len);
0ba8c7aa	156
0ba8c7aa	157	DD_DEBUG_S
c630715a	158
0ba8c7aa	159	if (len) {
	160	strcpy(found_name, tmpbuf);
	161	#ifdef DD_DEBUG
	162	printf("Found %s\n", found_name);
	163	#endif
	164	}
	165	}
	166
	167	if (dd_flags & DD_HANDLE_PROTO) {
	168
	169	s = skipspace(s);
	170
	171	if (s == '(') { / found a prototype-ish thing */
	172	save_s = s;
	173	s = scan_str(s, FALSE, FALSE); /* no keep_quoted, no keep_delims */
0f070758	174	#ifdef DD_HAS_TRAITS
	175	{
	176	char *traitstart = s = skipspace(s);
	177
	178	while (s && s != '{') ++s;
	179	if (*s) {
	180	int tlen = s - traitstart;
	181	Newx(found_traits, tlen+1, char);
	182	Copy(traitstart, found_traits, tlen, char);
	183	found_traits[tlen] = 0;
	184	#ifdef DD_DEBUG
	185	printf("found traits..... (%s)\n", found_traits);
	186	#endif
	187	}
	188	}
	189	#endif
	190
0ba8c7aa	191	if (SvPOK(PL_lex_stuff)) {
	192	#ifdef DD_DEBUG
	193	printf("Found proto %s\n", SvPVX(PL_lex_stuff));
	194	#endif
	195	found_proto = SvPVX(PL_lex_stuff);
53e3ab32	196	if (len) /* foo name () => foo name X, only foo parsed so works */
	197	*save_s++ = ' ';
	198	else /* foo () => foo =X, TOKEN('&') won't handle foo X */
	199	*save_s++ = '=';
0ba8c7aa	200	*save_s++ = 'X';
	201	while (save_s < s) {
	202	*save_s++ = ' ';
	203	}
	204	#ifdef DD_DEBUG
	205	printf("Curbuf %s\n", PL_bufptr);
	206	#endif
	207	}
	208	}
	209	}
	210
53e3ab32	211	if (!len)
	212	found_name[0] = 0;
	213
	214	#ifdef DD_DEBUG
	215	printf("Calling init_declare\n");
	216	#endif
	217	cb_args[0] = HvNAME(stash);
	218	cb_args[1] = GvNAME(kGVOP_gv);
9026391e	219	cb_args[2] = HvNAME(PL_curstash);
	220	cb_args[3] = found_name;
	221	cb_args[4] = found_proto;
0f070758	222	cb_args[5] = found_traits;
0f070758	223	cb_args[6] = NULL;
53e3ab32	224
	225	if (len && found_proto)
	226	in_declare = 2;
	227	else if (len \|\| found_proto)
	228	in_declare = 1;
	229	if (found_proto)
	230	PL_lex_stuff = Nullsv;
	231	s = skipspace(s);
	232	#ifdef DD_DEBUG
	233	printf("cur buf: %s\n", s);
	234	printf("bufend at: %i\n", PL_bufend - s);
	235	printf("linestr: %s\n", SvPVX(PL_linestr));
	236	printf("linestr len: %i\n", PL_bufend - SvPVX(PL_linestr));
	237	#endif
	238	if (*s++ == '{') {
	239	call_argv("Devel::Declare::init_declare", G_SCALAR, cb_args);
	240	SPAGAIN;
	241	retstr = POPpx;
	242	PUTBACK;
	243	if (retstr && strlen(retstr)) {
dcca2c59	244	const char* old_start = SvPVX(PL_linestr);
dcca2c59	245	int start_diff;
c5912dc7	246	const int old_len = SvCUR(PL_linestr);
0ba8c7aa	247	#ifdef DD_DEBUG
53e3ab32	248	printf("Got string %s\n", retstr);
0ba8c7aa	249	#endif
c5912dc7	250	SvGROW(PL_linestr, (STRLEN)(old_len + strlen(retstr)));
dcca2c59	251	if (start_diff = SvPVX(PL_linestr) - old_start) {
	252	#ifdef DD_DEBUG
	253	printf("linestr realloc'ed, moving stuff about by %i\n", start_diff);
	254	#endif
	255	s += start_diff;
	256	PL_linestart += start_diff;
	257	PL_bufptr += start_diff;
	258	PL_bufend += start_diff;
	259	PL_oldbufptr += start_diff;
	260	PL_oldoldbufptr += start_diff;
	261	if (PL_last_lop)
	262	PL_last_lop += start_diff;
	263	if (PL_last_uni)
	264	PL_last_uni += start_diff;
	265	}
53e3ab32	266	memmove(s+strlen(retstr), s, (PL_bufend - s)+1);
53e3ab32	267	memmove(s, retstr, strlen(retstr));
c5912dc7	268	SvCUR_set(PL_linestr, old_len + strlen(retstr));
53e3ab32	269	PL_bufend += strlen(retstr);
	270	#ifdef DD_DEBUG
	271	printf("cur buf: %s\n", s);
dcca2c59	272	printf("PL_bufptr: %s\n", PL_bufptr);
53e3ab32	273	printf("bufend at: %i\n", PL_bufend - s);
	274	printf("linestr: %s\n", SvPVX(PL_linestr));
	275	printf("linestr len: %i\n", PL_bufend - SvPVX(PL_linestr));
dcca2c59	276	printf("tokenbuf now: %s\n", PL_tokenbuf);
53e3ab32	277	#endif
	278	}
	279	} else {
94caac6e	280	call_argv("Devel::Declare::init_declare", G_VOID\|G_DISCARD, cb_args);
94caac6e	281	}
53e3ab32	282	return o;
	283	}
	284
	285	STATIC OP dd_ck_lineseq(pTHX_ OP o) {
	286	AV* pad_inject_list;
	287	SV** to_inject_ref;
	288	int i, pad_inject_list_last;
	289
d62484bb	290	o = dd_old_ck_lineseq(aTHX_ o);
53e3ab32	291
	292	pad_inject_list = get_av("Devel::Declare::next_pad_inject", FALSE);
	293	if (!pad_inject_list)
	294	return o;
	295
	296	pad_inject_list_last = av_len(pad_inject_list);
	297
	298	if (pad_inject_list_last == -1)
	299	return o;
	300
	301	for (i = 0; i <= pad_inject_list_last; i++) {
	302	to_inject_ref = av_fetch(pad_inject_list, i, FALSE);
	303	if (to_inject_ref && SvPOK(*to_inject_ref)) {
	304	#ifdef DD_DEBUG
	305	printf("Injecting %s into pad\n", SvPVX(*to_inject_ref));
	306	#endif
	307	allocmy(SvPVX(*to_inject_ref));
	308	}
	309	}
	310
	311	av_clear(pad_inject_list);
94caac6e	312
	313	return o;
	314	}
	315
	316	static int initialized = 0;
	317
	318	MODULE = Devel::Declare PACKAGE = Devel::Declare
	319
	320	PROTOTYPES: DISABLE
	321
	322	void
	323	setup()
	324	CODE:
	325	if (!initialized++) {
	326	dd_old_ck_rv2cv = PL_check[OP_RV2CV];
	327	PL_check[OP_RV2CV] = dd_ck_rv2cv;
53e3ab32	328	dd_old_ck_lineseq = PL_check[OP_LINESEQ];
53e3ab32	329	PL_check[OP_LINESEQ] = dd_ck_lineseq;
94caac6e	330	}
	331
	332	void
	333	teardown()
	334	CODE:
	335	/* ensure we only uninit when number of teardown calls matches
	336	number of setup calls */
	337	if (initialized && !--initialized) {
	338	PL_check[OP_RV2CV] = dd_old_ck_rv2cv;
	339	}