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a0d0e21e 1/* sv.c
79072805 2 *
4bb101f2 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
b94e2f88 4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e 9 * "I wonder what the Entish is for 'yes' and 'no'," he thought.
645c22ef
DM
10 *
11 *
5e045b90
AMS
12 * This file contains the code that creates, manipulates and destroys
13 * scalar values (SVs). The other types (AV, HV, GV, etc.) reuse the
14 * structure of an SV, so their creation and destruction is handled
15 * here; higher-level functions are in av.c, hv.c, and so on. Opcode
16 * level functions (eg. substr, split, join) for each of the types are
17 * in the pp*.c files.
79072805
LW
18 */
19
20#include "EXTERN.h"
864dbfa3 21#define PERL_IN_SV_C
79072805 22#include "perl.h"
d2f185dc 23#include "regcomp.h"
79072805 24
51371543 25#define FCALL *f
2c5424a7 26
2f8ed50e
OS
27#ifdef __Lynx__
28/* Missing proto on LynxOS */
29 char *gconvert(double, int, int, char *);
30#endif
31
e23c8137 32#ifdef PERL_UTF8_CACHE_ASSERT
ab455f60 33/* if adding more checks watch out for the following tests:
e23c8137
JH
34 * t/op/index.t t/op/length.t t/op/pat.t t/op/substr.t
35 * lib/utf8.t lib/Unicode/Collate/t/index.t
36 * --jhi
37 */
6f207bd3 38# define ASSERT_UTF8_CACHE(cache) \
ab455f60
NC
39 STMT_START { if (cache) { assert((cache)[0] <= (cache)[1]); \
40 assert((cache)[2] <= (cache)[3]); \
41 assert((cache)[3] <= (cache)[1]);} \
42 } STMT_END
e23c8137 43#else
6f207bd3 44# define ASSERT_UTF8_CACHE(cache) NOOP
e23c8137
JH
45#endif
46
f8c7b90f 47#ifdef PERL_OLD_COPY_ON_WRITE
765f542d 48#define SV_COW_NEXT_SV(sv) INT2PTR(SV *,SvUVX(sv))
607fa7f2 49#define SV_COW_NEXT_SV_SET(current,next) SvUV_set(current, PTR2UV(next))
b5ccf5f2 50/* This is a pessimistic view. Scalar must be purely a read-write PV to copy-
765f542d 51 on-write. */
765f542d 52#endif
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53
54/* ============================================================================
55
56=head1 Allocation and deallocation of SVs.
57
d2a0f284
JC
58An SV (or AV, HV, etc.) is allocated in two parts: the head (struct
59sv, av, hv...) contains type and reference count information, and for
60many types, a pointer to the body (struct xrv, xpv, xpviv...), which
61contains fields specific to each type. Some types store all they need
62in the head, so don't have a body.
63
64In all but the most memory-paranoid configuations (ex: PURIFY), heads
65and bodies are allocated out of arenas, which by default are
66approximately 4K chunks of memory parcelled up into N heads or bodies.
93e68bfb
JC
67Sv-bodies are allocated by their sv-type, guaranteeing size
68consistency needed to allocate safely from arrays.
69
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JC
70For SV-heads, the first slot in each arena is reserved, and holds a
71link to the next arena, some flags, and a note of the number of slots.
72Snaked through each arena chain is a linked list of free items; when
73this becomes empty, an extra arena is allocated and divided up into N
74items which are threaded into the free list.
75
76SV-bodies are similar, but they use arena-sets by default, which
77separate the link and info from the arena itself, and reclaim the 1st
78slot in the arena. SV-bodies are further described later.
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79
80The following global variables are associated with arenas:
81
82 PL_sv_arenaroot pointer to list of SV arenas
83 PL_sv_root pointer to list of free SV structures
84
d2a0f284
JC
85 PL_body_arenas head of linked-list of body arenas
86 PL_body_roots[] array of pointers to list of free bodies of svtype
87 arrays are indexed by the svtype needed
93e68bfb 88
d2a0f284
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89A few special SV heads are not allocated from an arena, but are
90instead directly created in the interpreter structure, eg PL_sv_undef.
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91The size of arenas can be changed from the default by setting
92PERL_ARENA_SIZE appropriately at compile time.
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93
94The SV arena serves the secondary purpose of allowing still-live SVs
95to be located and destroyed during final cleanup.
96
97At the lowest level, the macros new_SV() and del_SV() grab and free
98an SV head. (If debugging with -DD, del_SV() calls the function S_del_sv()
99to return the SV to the free list with error checking.) new_SV() calls
100more_sv() / sv_add_arena() to add an extra arena if the free list is empty.
101SVs in the free list have their SvTYPE field set to all ones.
102
ff276b08 103At the time of very final cleanup, sv_free_arenas() is called from
645c22ef 104perl_destruct() to physically free all the arenas allocated since the
6a93a7e5 105start of the interpreter.
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106
107Manipulation of any of the PL_*root pointers is protected by enclosing
108LOCK_SV_MUTEX; ... UNLOCK_SV_MUTEX calls which should Do the Right Thing
109if threads are enabled.
110
111The function visit() scans the SV arenas list, and calls a specified
112function for each SV it finds which is still live - ie which has an SvTYPE
113other than all 1's, and a non-zero SvREFCNT. visit() is used by the
114following functions (specified as [function that calls visit()] / [function
115called by visit() for each SV]):
116
117 sv_report_used() / do_report_used()
f2524eef 118 dump all remaining SVs (debugging aid)
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119
120 sv_clean_objs() / do_clean_objs(),do_clean_named_objs()
121 Attempt to free all objects pointed to by RVs,
122 and, unless DISABLE_DESTRUCTOR_KLUDGE is defined,
123 try to do the same for all objects indirectly
124 referenced by typeglobs too. Called once from
125 perl_destruct(), prior to calling sv_clean_all()
126 below.
127
128 sv_clean_all() / do_clean_all()
129 SvREFCNT_dec(sv) each remaining SV, possibly
130 triggering an sv_free(). It also sets the
131 SVf_BREAK flag on the SV to indicate that the
132 refcnt has been artificially lowered, and thus
133 stopping sv_free() from giving spurious warnings
134 about SVs which unexpectedly have a refcnt
135 of zero. called repeatedly from perl_destruct()
136 until there are no SVs left.
137
93e68bfb 138=head2 Arena allocator API Summary
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139
140Private API to rest of sv.c
141
142 new_SV(), del_SV(),
143
144 new_XIV(), del_XIV(),
145 new_XNV(), del_XNV(),
146 etc
147
148Public API:
149
8cf8f3d1 150 sv_report_used(), sv_clean_objs(), sv_clean_all(), sv_free_arenas()
645c22ef 151
645c22ef
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152=cut
153
154============================================================================ */
155
4561caa4
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156/*
157 * "A time to plant, and a time to uproot what was planted..."
158 */
159
77354fb4
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160/*
161 * nice_chunk and nice_chunk size need to be set
162 * and queried under the protection of sv_mutex
163 */
164void
165Perl_offer_nice_chunk(pTHX_ void *chunk, U32 chunk_size)
166{
97aff369 167 dVAR;
77354fb4
NC
168 void *new_chunk;
169 U32 new_chunk_size;
170 LOCK_SV_MUTEX;
171 new_chunk = (void *)(chunk);
172 new_chunk_size = (chunk_size);
173 if (new_chunk_size > PL_nice_chunk_size) {
174 Safefree(PL_nice_chunk);
175 PL_nice_chunk = (char *) new_chunk;
176 PL_nice_chunk_size = new_chunk_size;
177 } else {
178 Safefree(chunk);
179 }
180 UNLOCK_SV_MUTEX;
181}
cac9b346 182
fd0854ff 183#ifdef DEBUG_LEAKING_SCALARS
22162ca8 184# define FREE_SV_DEBUG_FILE(sv) Safefree((sv)->sv_debug_file)
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185#else
186# define FREE_SV_DEBUG_FILE(sv)
187#endif
188
48614a46
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189#ifdef PERL_POISON
190# define SvARENA_CHAIN(sv) ((sv)->sv_u.svu_rv)
191/* Whilst I'd love to do this, it seems that things like to check on
192 unreferenced scalars
7e337ee0 193# define POSION_SV_HEAD(sv) PoisonNew(sv, 1, struct STRUCT_SV)
48614a46 194*/
7e337ee0
JH
195# define POSION_SV_HEAD(sv) PoisonNew(&SvANY(sv), 1, void *), \
196 PoisonNew(&SvREFCNT(sv), 1, U32)
48614a46
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197#else
198# define SvARENA_CHAIN(sv) SvANY(sv)
199# define POSION_SV_HEAD(sv)
200#endif
201
053fc874
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202#define plant_SV(p) \
203 STMT_START { \
fd0854ff 204 FREE_SV_DEBUG_FILE(p); \
48614a46
NC
205 POSION_SV_HEAD(p); \
206 SvARENA_CHAIN(p) = (void *)PL_sv_root; \
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207 SvFLAGS(p) = SVTYPEMASK; \
208 PL_sv_root = (p); \
209 --PL_sv_count; \
210 } STMT_END
a0d0e21e 211
fba3b22e 212/* sv_mutex must be held while calling uproot_SV() */
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213#define uproot_SV(p) \
214 STMT_START { \
215 (p) = PL_sv_root; \
bb7bbd9c 216 PL_sv_root = (SV*)SvARENA_CHAIN(p); \
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217 ++PL_sv_count; \
218 } STMT_END
219
645c22ef 220
cac9b346
NC
221/* make some more SVs by adding another arena */
222
223/* sv_mutex must be held while calling more_sv() */
224STATIC SV*
225S_more_sv(pTHX)
226{
97aff369 227 dVAR;
cac9b346
NC
228 SV* sv;
229
230 if (PL_nice_chunk) {
231 sv_add_arena(PL_nice_chunk, PL_nice_chunk_size, 0);
bd61b366 232 PL_nice_chunk = NULL;
cac9b346
NC
233 PL_nice_chunk_size = 0;
234 }
235 else {
236 char *chunk; /* must use New here to match call to */
d2a0f284 237 Newx(chunk,PERL_ARENA_SIZE,char); /* Safefree() in sv_free_arenas() */
2e7ed132 238 sv_add_arena(chunk, PERL_ARENA_SIZE, 0);
cac9b346
NC
239 }
240 uproot_SV(sv);
241 return sv;
242}
243
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DM
244/* new_SV(): return a new, empty SV head */
245
eba0f806
DM
246#ifdef DEBUG_LEAKING_SCALARS
247/* provide a real function for a debugger to play with */
248STATIC SV*
249S_new_SV(pTHX)
250{
251 SV* sv;
252
253 LOCK_SV_MUTEX;
254 if (PL_sv_root)
255 uproot_SV(sv);
256 else
cac9b346 257 sv = S_more_sv(aTHX);
eba0f806
DM
258 UNLOCK_SV_MUTEX;
259 SvANY(sv) = 0;
260 SvREFCNT(sv) = 1;
261 SvFLAGS(sv) = 0;
fd0854ff
DM
262 sv->sv_debug_optype = PL_op ? PL_op->op_type : 0;
263 sv->sv_debug_line = (U16) ((PL_copline == NOLINE) ?
264 (PL_curcop ? CopLINE(PL_curcop) : 0) : PL_copline);
265 sv->sv_debug_inpad = 0;
266 sv->sv_debug_cloned = 0;
fd0854ff 267 sv->sv_debug_file = PL_curcop ? savepv(CopFILE(PL_curcop)): NULL;
fd0854ff 268
eba0f806
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269 return sv;
270}
271# define new_SV(p) (p)=S_new_SV(aTHX)
272
273#else
274# define new_SV(p) \
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GS
275 STMT_START { \
276 LOCK_SV_MUTEX; \
277 if (PL_sv_root) \
278 uproot_SV(p); \
279 else \
cac9b346 280 (p) = S_more_sv(aTHX); \
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GS
281 UNLOCK_SV_MUTEX; \
282 SvANY(p) = 0; \
283 SvREFCNT(p) = 1; \
284 SvFLAGS(p) = 0; \
285 } STMT_END
eba0f806 286#endif
463ee0b2 287
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288
289/* del_SV(): return an empty SV head to the free list */
290
a0d0e21e 291#ifdef DEBUGGING
4561caa4 292
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293#define del_SV(p) \
294 STMT_START { \
295 LOCK_SV_MUTEX; \
aea4f609 296 if (DEBUG_D_TEST) \
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297 del_sv(p); \
298 else \
299 plant_SV(p); \
300 UNLOCK_SV_MUTEX; \
301 } STMT_END
a0d0e21e 302
76e3520e 303STATIC void
cea2e8a9 304S_del_sv(pTHX_ SV *p)
463ee0b2 305{
97aff369 306 dVAR;
aea4f609 307 if (DEBUG_D_TEST) {
4633a7c4 308 SV* sva;
a3b680e6 309 bool ok = 0;
3280af22 310 for (sva = PL_sv_arenaroot; sva; sva = (SV *) SvANY(sva)) {
53c1dcc0
AL
311 const SV * const sv = sva + 1;
312 const SV * const svend = &sva[SvREFCNT(sva)];
c0ff570e 313 if (p >= sv && p < svend) {
a0d0e21e 314 ok = 1;
c0ff570e
NC
315 break;
316 }
a0d0e21e
LW
317 }
318 if (!ok) {
0453d815 319 if (ckWARN_d(WARN_INTERNAL))
9014280d 320 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
472d47bc
SB
321 "Attempt to free non-arena SV: 0x%"UVxf
322 pTHX__FORMAT, PTR2UV(p) pTHX__VALUE);
a0d0e21e
LW
323 return;
324 }
325 }
4561caa4 326 plant_SV(p);
463ee0b2 327}
a0d0e21e 328
4561caa4
CS
329#else /* ! DEBUGGING */
330
331#define del_SV(p) plant_SV(p)
332
333#endif /* DEBUGGING */
463ee0b2 334
645c22ef
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335
336/*
ccfc67b7
JH
337=head1 SV Manipulation Functions
338
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339=for apidoc sv_add_arena
340
341Given a chunk of memory, link it to the head of the list of arenas,
342and split it into a list of free SVs.
343
344=cut
345*/
346
4633a7c4 347void
864dbfa3 348Perl_sv_add_arena(pTHX_ char *ptr, U32 size, U32 flags)
463ee0b2 349{
97aff369 350 dVAR;
0bd48802 351 SV* const sva = (SV*)ptr;
463ee0b2
LW
352 register SV* sv;
353 register SV* svend;
4633a7c4
LW
354
355 /* The first SV in an arena isn't an SV. */
3280af22 356 SvANY(sva) = (void *) PL_sv_arenaroot; /* ptr to next arena */
4633a7c4
LW
357 SvREFCNT(sva) = size / sizeof(SV); /* number of SV slots */
358 SvFLAGS(sva) = flags; /* FAKE if not to be freed */
359
3280af22
NIS
360 PL_sv_arenaroot = sva;
361 PL_sv_root = sva + 1;
4633a7c4
LW
362
363 svend = &sva[SvREFCNT(sva) - 1];
364 sv = sva + 1;
463ee0b2 365 while (sv < svend) {
48614a46 366 SvARENA_CHAIN(sv) = (void *)(SV*)(sv + 1);
03e36789 367#ifdef DEBUGGING
978b032e 368 SvREFCNT(sv) = 0;
03e36789
NC
369#endif
370 /* Must always set typemask because it's awlays checked in on cleanup
371 when the arenas are walked looking for objects. */
8990e307 372 SvFLAGS(sv) = SVTYPEMASK;
463ee0b2
LW
373 sv++;
374 }
48614a46 375 SvARENA_CHAIN(sv) = 0;
03e36789
NC
376#ifdef DEBUGGING
377 SvREFCNT(sv) = 0;
378#endif
4633a7c4
LW
379 SvFLAGS(sv) = SVTYPEMASK;
380}
381
055972dc
DM
382/* visit(): call the named function for each non-free SV in the arenas
383 * whose flags field matches the flags/mask args. */
645c22ef 384
5226ed68 385STATIC I32
055972dc 386S_visit(pTHX_ SVFUNC_t f, U32 flags, U32 mask)
8990e307 387{
97aff369 388 dVAR;
4633a7c4 389 SV* sva;
5226ed68 390 I32 visited = 0;
8990e307 391
3280af22 392 for (sva = PL_sv_arenaroot; sva; sva = (SV*)SvANY(sva)) {
53c1dcc0 393 register const SV * const svend = &sva[SvREFCNT(sva)];
a3b680e6 394 register SV* sv;
4561caa4 395 for (sv = sva + 1; sv < svend; ++sv) {
055972dc
DM
396 if (SvTYPE(sv) != SVTYPEMASK
397 && (sv->sv_flags & mask) == flags
398 && SvREFCNT(sv))
399 {
acfe0abc 400 (FCALL)(aTHX_ sv);
5226ed68
JH
401 ++visited;
402 }
8990e307
LW
403 }
404 }
5226ed68 405 return visited;
8990e307
LW
406}
407
758a08c3
JH
408#ifdef DEBUGGING
409
645c22ef
DM
410/* called by sv_report_used() for each live SV */
411
412static void
acfe0abc 413do_report_used(pTHX_ SV *sv)
645c22ef
DM
414{
415 if (SvTYPE(sv) != SVTYPEMASK) {
416 PerlIO_printf(Perl_debug_log, "****\n");
417 sv_dump(sv);
418 }
419}
758a08c3 420#endif
645c22ef
DM
421
422/*
423=for apidoc sv_report_used
424
425Dump the contents of all SVs not yet freed. (Debugging aid).
426
427=cut
428*/
429
8990e307 430void
864dbfa3 431Perl_sv_report_used(pTHX)
4561caa4 432{
ff270d3a 433#ifdef DEBUGGING
055972dc 434 visit(do_report_used, 0, 0);
96a5add6
AL
435#else
436 PERL_UNUSED_CONTEXT;
ff270d3a 437#endif
4561caa4
CS
438}
439
645c22ef
DM
440/* called by sv_clean_objs() for each live SV */
441
442static void
e15faf7d 443do_clean_objs(pTHX_ SV *ref)
645c22ef 444{
97aff369 445 dVAR;
823a54a3
AL
446 if (SvROK(ref)) {
447 SV * const target = SvRV(ref);
448 if (SvOBJECT(target)) {
449 DEBUG_D((PerlIO_printf(Perl_debug_log, "Cleaning object ref:\n "), sv_dump(ref)));
450 if (SvWEAKREF(ref)) {
451 sv_del_backref(target, ref);
452 SvWEAKREF_off(ref);
453 SvRV_set(ref, NULL);
454 } else {
455 SvROK_off(ref);
456 SvRV_set(ref, NULL);
457 SvREFCNT_dec(target);
458 }
645c22ef
DM
459 }
460 }
461
462 /* XXX Might want to check arrays, etc. */
463}
464
465/* called by sv_clean_objs() for each live SV */
466
467#ifndef DISABLE_DESTRUCTOR_KLUDGE
468static void
acfe0abc 469do_clean_named_objs(pTHX_ SV *sv)
645c22ef 470{
97aff369 471 dVAR;
f7877b28 472 if (SvTYPE(sv) == SVt_PVGV && isGV_with_GP(sv) && GvGP(sv)) {
c69033f2
NC
473 if ((
474#ifdef PERL_DONT_CREATE_GVSV
475 GvSV(sv) &&
476#endif
477 SvOBJECT(GvSV(sv))) ||
645c22ef
DM
478 (GvAV(sv) && SvOBJECT(GvAV(sv))) ||
479 (GvHV(sv) && SvOBJECT(GvHV(sv))) ||
480 (GvIO(sv) && SvOBJECT(GvIO(sv))) ||
481 (GvCV(sv) && SvOBJECT(GvCV(sv))) )
482 {
483 DEBUG_D((PerlIO_printf(Perl_debug_log, "Cleaning named glob object:\n "), sv_dump(sv)));
ec5f3c78 484 SvFLAGS(sv) |= SVf_BREAK;
645c22ef
DM
485 SvREFCNT_dec(sv);
486 }
487 }
488}
489#endif
490
491/*
492=for apidoc sv_clean_objs
493
494Attempt to destroy all objects not yet freed
495
496=cut
497*/
498
4561caa4 499void
864dbfa3 500Perl_sv_clean_objs(pTHX)
4561caa4 501{
97aff369 502 dVAR;
3280af22 503 PL_in_clean_objs = TRUE;
055972dc 504 visit(do_clean_objs, SVf_ROK, SVf_ROK);
4561caa4 505#ifndef DISABLE_DESTRUCTOR_KLUDGE
2d0f3c12 506 /* some barnacles may yet remain, clinging to typeglobs */
055972dc 507 visit(do_clean_named_objs, SVt_PVGV, SVTYPEMASK);
4561caa4 508#endif
3280af22 509 PL_in_clean_objs = FALSE;
4561caa4
CS
510}
511
645c22ef
DM
512/* called by sv_clean_all() for each live SV */
513
514static void
acfe0abc 515do_clean_all(pTHX_ SV *sv)
645c22ef 516{
97aff369 517 dVAR;
645c22ef
DM
518 DEBUG_D((PerlIO_printf(Perl_debug_log, "Cleaning loops: SV at 0x%"UVxf"\n", PTR2UV(sv)) ));
519 SvFLAGS(sv) |= SVf_BREAK;
0e705b3b 520 if (PL_comppad == (AV*)sv) {
7d49f689 521 PL_comppad = NULL;
4608196e 522 PL_curpad = NULL;
0e705b3b 523 }
645c22ef
DM
524 SvREFCNT_dec(sv);
525}
526
527/*
528=for apidoc sv_clean_all
529
530Decrement the refcnt of each remaining SV, possibly triggering a
531cleanup. This function may have to be called multiple times to free
ff276b08 532SVs which are in complex self-referential hierarchies.
645c22ef
DM
533
534=cut
535*/
536
5226ed68 537I32
864dbfa3 538Perl_sv_clean_all(pTHX)
8990e307 539{
97aff369 540 dVAR;
5226ed68 541 I32 cleaned;
3280af22 542 PL_in_clean_all = TRUE;
055972dc 543 cleaned = visit(do_clean_all, 0,0);
3280af22 544 PL_in_clean_all = FALSE;
5226ed68 545 return cleaned;
8990e307 546}
463ee0b2 547
5e258f8c
JC
548/*
549 ARENASETS: a meta-arena implementation which separates arena-info
550 into struct arena_set, which contains an array of struct
551 arena_descs, each holding info for a single arena. By separating
552 the meta-info from the arena, we recover the 1st slot, formerly
553 borrowed for list management. The arena_set is about the size of an
554 arena, avoiding the needless malloc overhead of a naive linked-list
555
556 The cost is 1 arena-set malloc per ~320 arena-mallocs, + the unused
557 memory in the last arena-set (1/2 on average). In trade, we get
558 back the 1st slot in each arena (ie 1.7% of a CV-arena, less for
d2a0f284
JC
559 smaller types). The recovery of the wasted space allows use of
560 small arenas for large, rare body types,
5e258f8c 561*/
5e258f8c 562struct arena_desc {
398c677b
NC
563 char *arena; /* the raw storage, allocated aligned */
564 size_t size; /* its size ~4k typ */
565 int unit_type; /* useful for arena audits */
5e258f8c
JC
566 /* info for sv-heads (eventually)
567 int count, flags;
568 */
569};
570
e6148039
NC
571struct arena_set;
572
573/* Get the maximum number of elements in set[] such that struct arena_set
574 will fit within PERL_ARENA_SIZE, which is probabably just under 4K, and
575 therefore likely to be 1 aligned memory page. */
576
577#define ARENAS_PER_SET ((PERL_ARENA_SIZE - sizeof(struct arena_set*) \
578 - 2 * sizeof(int)) / sizeof (struct arena_desc))
5e258f8c
JC
579
580struct arena_set {
581 struct arena_set* next;
582 int set_size; /* ie ARENAS_PER_SET */
583 int curr; /* index of next available arena-desc */
584 struct arena_desc set[ARENAS_PER_SET];
585};
586
645c22ef
DM
587/*
588=for apidoc sv_free_arenas
589
590Deallocate the memory used by all arenas. Note that all the individual SV
591heads and bodies within the arenas must already have been freed.
592
593=cut
594*/
4633a7c4 595void
864dbfa3 596Perl_sv_free_arenas(pTHX)
4633a7c4 597{
97aff369 598 dVAR;
4633a7c4
LW
599 SV* sva;
600 SV* svanext;
93e68bfb 601 int i;
4633a7c4
LW
602
603 /* Free arenas here, but be careful about fake ones. (We assume
604 contiguity of the fake ones with the corresponding real ones.) */
605
3280af22 606 for (sva = PL_sv_arenaroot; sva; sva = svanext) {
4633a7c4
LW
607 svanext = (SV*) SvANY(sva);
608 while (svanext && SvFAKE(svanext))
609 svanext = (SV*) SvANY(svanext);
610
611 if (!SvFAKE(sva))
1df70142 612 Safefree(sva);
4633a7c4 613 }
93e68bfb 614
5e258f8c
JC
615 {
616 struct arena_set *next, *aroot = (struct arena_set*) PL_body_arenas;
617
618 for (; aroot; aroot = next) {
96a5add6 619 const int max = aroot->curr;
5e258f8c
JC
620 for (i=0; i<max; i++) {
621 assert(aroot->set[i].arena);
622 Safefree(aroot->set[i].arena);
623 }
624 next = aroot->next;
625 Safefree(aroot);
626 }
627 }
dc8220bf 628 PL_body_arenas = 0;
fdda85ca 629
232d1c15 630 for (i=0; i<PERL_ARENA_ROOTS_SIZE; i++)
93e68bfb 631 PL_body_roots[i] = 0;
93e68bfb 632
43c5f42d 633 Safefree(PL_nice_chunk);
bd61b366 634 PL_nice_chunk = NULL;
3280af22
NIS
635 PL_nice_chunk_size = 0;
636 PL_sv_arenaroot = 0;
637 PL_sv_root = 0;
4633a7c4
LW
638}
639
bd81e77b
NC
640/*
641 Here are mid-level routines that manage the allocation of bodies out
642 of the various arenas. There are 5 kinds of arenas:
29489e7c 643
bd81e77b
NC
644 1. SV-head arenas, which are discussed and handled above
645 2. regular body arenas
646 3. arenas for reduced-size bodies
647 4. Hash-Entry arenas
648 5. pte arenas (thread related)
29489e7c 649
bd81e77b
NC
650 Arena types 2 & 3 are chained by body-type off an array of
651 arena-root pointers, which is indexed by svtype. Some of the
652 larger/less used body types are malloced singly, since a large
653 unused block of them is wasteful. Also, several svtypes dont have
654 bodies; the data fits into the sv-head itself. The arena-root
655 pointer thus has a few unused root-pointers (which may be hijacked
656 later for arena types 4,5)
29489e7c 657
bd81e77b
NC
658 3 differs from 2 as an optimization; some body types have several
659 unused fields in the front of the structure (which are kept in-place
660 for consistency). These bodies can be allocated in smaller chunks,
661 because the leading fields arent accessed. Pointers to such bodies
662 are decremented to point at the unused 'ghost' memory, knowing that
663 the pointers are used with offsets to the real memory.
29489e7c 664
bd81e77b
NC
665 HE, HEK arenas are managed separately, with separate code, but may
666 be merge-able later..
667
668 PTE arenas are not sv-bodies, but they share these mid-level
669 mechanics, so are considered here. The new mid-level mechanics rely
670 on the sv_type of the body being allocated, so we just reserve one
671 of the unused body-slots for PTEs, then use it in those (2) PTE
672 contexts below (line ~10k)
673*/
674
bd26d9a3 675/* get_arena(size): this creates custom-sized arenas
5e258f8c
JC
676 TBD: export properly for hv.c: S_more_he().
677*/
678void*
679Perl_get_arena(pTHX_ int arena_size)
680{
7a89be66 681 dVAR;
5e258f8c 682 struct arena_desc* adesc;
476a1e16 683 struct arena_set *newroot, **aroot = (struct arena_set**) &PL_body_arenas;
5e258f8c
JC
684 int curr;
685
476a1e16
JC
686 /* shouldnt need this
687 if (!arena_size) arena_size = PERL_ARENA_SIZE;
688 */
5e258f8c
JC
689
690 /* may need new arena-set to hold new arena */
476a1e16 691 if (!*aroot || (*aroot)->curr >= (*aroot)->set_size) {
5e258f8c
JC
692 Newxz(newroot, 1, struct arena_set);
693 newroot->set_size = ARENAS_PER_SET;
476a1e16
JC
694 newroot->next = *aroot;
695 *aroot = newroot;
ca0270c4 696 DEBUG_m(PerlIO_printf(Perl_debug_log, "new arenaset %p\n", (void*)*aroot));
5e258f8c
JC
697 }
698
699 /* ok, now have arena-set with at least 1 empty/available arena-desc */
476a1e16
JC
700 curr = (*aroot)->curr++;
701 adesc = &((*aroot)->set[curr]);
5e258f8c
JC
702 assert(!adesc->arena);
703
5e258f8c
JC
704 Newxz(adesc->arena, arena_size, char);
705 adesc->size = arena_size;
d2a0f284
JC
706 DEBUG_m(PerlIO_printf(Perl_debug_log, "arena %d added: %p size %d\n",
707 curr, adesc->arena, arena_size));
5e258f8c
JC
708
709 return adesc->arena;
5e258f8c
JC
710}
711
53c1dcc0 712
bd81e77b 713/* return a thing to the free list */
29489e7c 714
bd81e77b
NC
715#define del_body(thing, root) \
716 STMT_START { \
00b6aa41 717 void ** const thing_copy = (void **)thing;\
bd81e77b
NC
718 LOCK_SV_MUTEX; \
719 *thing_copy = *root; \
720 *root = (void*)thing_copy; \
721 UNLOCK_SV_MUTEX; \
722 } STMT_END
29489e7c 723
bd81e77b 724/*
d2a0f284
JC
725
726=head1 SV-Body Allocation
727
728Allocation of SV-bodies is similar to SV-heads, differing as follows;
729the allocation mechanism is used for many body types, so is somewhat
730more complicated, it uses arena-sets, and has no need for still-live
731SV detection.
732
733At the outermost level, (new|del)_X*V macros return bodies of the
734appropriate type. These macros call either (new|del)_body_type or
735(new|del)_body_allocated macro pairs, depending on specifics of the
736type. Most body types use the former pair, the latter pair is used to
737allocate body types with "ghost fields".
738
739"ghost fields" are fields that are unused in certain types, and
740consequently dont need to actually exist. They are declared because
741they're part of a "base type", which allows use of functions as
742methods. The simplest examples are AVs and HVs, 2 aggregate types
743which don't use the fields which support SCALAR semantics.
744
745For these types, the arenas are carved up into *_allocated size
746chunks, we thus avoid wasted memory for those unaccessed members.
747When bodies are allocated, we adjust the pointer back in memory by the
748size of the bit not allocated, so it's as if we allocated the full
749structure. (But things will all go boom if you write to the part that
750is "not there", because you'll be overwriting the last members of the
751preceding structure in memory.)
752
753We calculate the correction using the STRUCT_OFFSET macro. For
754example, if xpv_allocated is the same structure as XPV then the two
755OFFSETs sum to zero, and the pointer is unchanged. If the allocated
756structure is smaller (no initial NV actually allocated) then the net
757effect is to subtract the size of the NV from the pointer, to return a
758new pointer as if an initial NV were actually allocated.
759
760This is the same trick as was used for NV and IV bodies. Ironically it
761doesn't need to be used for NV bodies any more, because NV is now at
762the start of the structure. IV bodies don't need it either, because
763they are no longer allocated.
764
765In turn, the new_body_* allocators call S_new_body(), which invokes
766new_body_inline macro, which takes a lock, and takes a body off the
767linked list at PL_body_roots[sv_type], calling S_more_bodies() if
768necessary to refresh an empty list. Then the lock is released, and
769the body is returned.
770
771S_more_bodies calls get_arena(), and carves it up into an array of N
772bodies, which it strings into a linked list. It looks up arena-size
773and body-size from the body_details table described below, thus
774supporting the multiple body-types.
775
776If PURIFY is defined, or PERL_ARENA_SIZE=0, arenas are not used, and
777the (new|del)_X*V macros are mapped directly to malloc/free.
778
779*/
780
781/*
782
783For each sv-type, struct body_details bodies_by_type[] carries
784parameters which control these aspects of SV handling:
785
786Arena_size determines whether arenas are used for this body type, and if
787so, how big they are. PURIFY or PERL_ARENA_SIZE=0 set this field to
788zero, forcing individual mallocs and frees.
789
790Body_size determines how big a body is, and therefore how many fit into
791each arena. Offset carries the body-pointer adjustment needed for
792*_allocated body types, and is used in *_allocated macros.
793
794But its main purpose is to parameterize info needed in
795Perl_sv_upgrade(). The info here dramatically simplifies the function
796vs the implementation in 5.8.7, making it table-driven. All fields
797are used for this, except for arena_size.
798
799For the sv-types that have no bodies, arenas are not used, so those
800PL_body_roots[sv_type] are unused, and can be overloaded. In
801something of a special case, SVt_NULL is borrowed for HE arenas;
802PL_body_roots[SVt_NULL] is filled by S_more_he, but the
803bodies_by_type[SVt_NULL] slot is not used, as the table is not
804available in hv.c,
805
806PTEs also use arenas, but are never seen in Perl_sv_upgrade.
807Nonetheless, they get their own slot in bodies_by_type[SVt_NULL], so
808they can just use the same allocation semantics. At first, PTEs were
809also overloaded to a non-body sv-type, but this yielded hard-to-find
810malloc bugs, so was simplified by claiming a new slot. This choice
811has no consequence at this time.
812
29489e7c
DM
813*/
814
bd81e77b 815struct body_details {
0fb58b32 816 U8 body_size; /* Size to allocate */
10666ae3 817 U8 copy; /* Size of structure to copy (may be shorter) */
0fb58b32 818 U8 offset;
10666ae3
NC
819 unsigned int type : 4; /* We have space for a sanity check. */
820 unsigned int cant_upgrade : 1; /* Cannot upgrade this type */
821 unsigned int zero_nv : 1; /* zero the NV when upgrading from this */
822 unsigned int arena : 1; /* Allocated from an arena */
823 size_t arena_size; /* Size of arena to allocate */
bd81e77b 824};
29489e7c 825
bd81e77b
NC
826#define HADNV FALSE
827#define NONV TRUE
29489e7c 828
d2a0f284 829
bd81e77b
NC
830#ifdef PURIFY
831/* With -DPURFIY we allocate everything directly, and don't use arenas.
832 This seems a rather elegant way to simplify some of the code below. */
833#define HASARENA FALSE
834#else
835#define HASARENA TRUE
836#endif
837#define NOARENA FALSE
29489e7c 838
d2a0f284
JC
839/* Size the arenas to exactly fit a given number of bodies. A count
840 of 0 fits the max number bodies into a PERL_ARENA_SIZE.block,
841 simplifying the default. If count > 0, the arena is sized to fit
842 only that many bodies, allowing arenas to be used for large, rare
843 bodies (XPVFM, XPVIO) without undue waste. The arena size is
844 limited by PERL_ARENA_SIZE, so we can safely oversize the
845 declarations.
846 */
95db5f15
MB
847#define FIT_ARENA0(body_size) \
848 ((size_t)(PERL_ARENA_SIZE / body_size) * body_size)
849#define FIT_ARENAn(count,body_size) \
850 ( count * body_size <= PERL_ARENA_SIZE) \
851 ? count * body_size \
852 : FIT_ARENA0 (body_size)
853#define FIT_ARENA(count,body_size) \
854 count \
855 ? FIT_ARENAn (count, body_size) \
856 : FIT_ARENA0 (body_size)
d2a0f284 857
bd81e77b 858/* A macro to work out the offset needed to subtract from a pointer to (say)
29489e7c 859
bd81e77b
NC
860typedef struct {
861 STRLEN xpv_cur;
862 STRLEN xpv_len;
863} xpv_allocated;
29489e7c 864
bd81e77b 865to make its members accessible via a pointer to (say)
29489e7c 866
bd81e77b
NC
867struct xpv {
868 NV xnv_nv;
869 STRLEN xpv_cur;
870 STRLEN xpv_len;
871};
29489e7c 872
bd81e77b 873*/
29489e7c 874
bd81e77b
NC
875#define relative_STRUCT_OFFSET(longer, shorter, member) \
876 (STRUCT_OFFSET(shorter, member) - STRUCT_OFFSET(longer, member))
29489e7c 877
bd81e77b
NC
878/* Calculate the length to copy. Specifically work out the length less any
879 final padding the compiler needed to add. See the comment in sv_upgrade
880 for why copying the padding proved to be a bug. */
29489e7c 881
bd81e77b
NC
882#define copy_length(type, last_member) \
883 STRUCT_OFFSET(type, last_member) \
884 + sizeof (((type*)SvANY((SV*)0))->last_member)
29489e7c 885
bd81e77b 886static const struct body_details bodies_by_type[] = {
10666ae3
NC
887 { sizeof(HE), 0, 0, SVt_NULL,
888 FALSE, NONV, NOARENA, FIT_ARENA(0, sizeof(HE)) },
d2a0f284
JC
889
890 /* IVs are in the head, so the allocation size is 0.
891 However, the slot is overloaded for PTEs. */
892 { sizeof(struct ptr_tbl_ent), /* This is used for PTEs. */
893 sizeof(IV), /* This is used to copy out the IV body. */
10666ae3 894 STRUCT_OFFSET(XPVIV, xiv_iv), SVt_IV, FALSE, NONV,
d2a0f284
JC
895 NOARENA /* IVS don't need an arena */,
896 /* But PTEs need to know the size of their arena */
897 FIT_ARENA(0, sizeof(struct ptr_tbl_ent))
898 },
899
bd81e77b 900 /* 8 bytes on most ILP32 with IEEE doubles */
10666ae3 901 { sizeof(NV), sizeof(NV), 0, SVt_NV, FALSE, HADNV, HASARENA,
d2a0f284
JC
902 FIT_ARENA(0, sizeof(NV)) },
903
904 /* RVs are in the head now. */
10666ae3 905 { 0, 0, 0, SVt_RV, FALSE, NONV, NOARENA, 0 },
d2a0f284 906
bd81e77b 907 /* 8 bytes on most ILP32 with IEEE doubles */
d2a0f284
JC
908 { sizeof(xpv_allocated),
909 copy_length(XPV, xpv_len)
910 - relative_STRUCT_OFFSET(xpv_allocated, XPV, xpv_cur),
911 + relative_STRUCT_OFFSET(xpv_allocated, XPV, xpv_cur),
10666ae3 912 SVt_PV, FALSE, NONV, HASARENA, FIT_ARENA(0, sizeof(xpv_allocated)) },
d2a0f284 913
bd81e77b 914 /* 12 */
d2a0f284
JC
915 { sizeof(xpviv_allocated),
916 copy_length(XPVIV, xiv_u)
917 - relative_STRUCT_OFFSET(xpviv_allocated, XPVIV, xpv_cur),
918 + relative_STRUCT_OFFSET(xpviv_allocated, XPVIV, xpv_cur),
10666ae3 919 SVt_PVIV, FALSE, NONV, HASARENA, FIT_ARENA(0, sizeof(xpviv_allocated)) },
d2a0f284 920
bd81e77b 921 /* 20 */
10666ae3 922 { sizeof(XPVNV), copy_length(XPVNV, xiv_u), 0, SVt_PVNV, FALSE, HADNV,
d2a0f284
JC
923 HASARENA, FIT_ARENA(0, sizeof(XPVNV)) },
924
bd81e77b 925 /* 28 */
10666ae3 926 { sizeof(XPVMG), copy_length(XPVMG, xmg_stash), 0, SVt_PVMG, FALSE, HADNV,
d2a0f284
JC
927 HASARENA, FIT_ARENA(0, sizeof(XPVMG)) },
928
bd81e77b 929 /* 36 */
10666ae3 930 { sizeof(XPVBM), sizeof(XPVBM), 0, SVt_PVBM, TRUE, HADNV,
d2a0f284
JC
931 HASARENA, FIT_ARENA(0, sizeof(XPVBM)) },
932
bd81e77b 933 /* 48 */
10666ae3 934 { sizeof(XPVGV), sizeof(XPVGV), 0, SVt_PVGV, TRUE, HADNV,
d2a0f284
JC
935 HASARENA, FIT_ARENA(0, sizeof(XPVGV)) },
936
bd81e77b 937 /* 64 */
10666ae3 938 { sizeof(XPVLV), sizeof(XPVLV), 0, SVt_PVLV, TRUE, HADNV,
d2a0f284
JC
939 HASARENA, FIT_ARENA(0, sizeof(XPVLV)) },
940
941 { sizeof(xpvav_allocated),
942 copy_length(XPVAV, xmg_stash)
943 - relative_STRUCT_OFFSET(xpvav_allocated, XPVAV, xav_fill),
944 + relative_STRUCT_OFFSET(xpvav_allocated, XPVAV, xav_fill),
10666ae3 945 SVt_PVAV, TRUE, HADNV, HASARENA, FIT_ARENA(0, sizeof(xpvav_allocated)) },
d2a0f284
JC
946
947 { sizeof(xpvhv_allocated),
948 copy_length(XPVHV, xmg_stash)
949 - relative_STRUCT_OFFSET(xpvhv_allocated, XPVHV, xhv_fill),
950 + relative_STRUCT_OFFSET(xpvhv_allocated, XPVHV, xhv_fill),
10666ae3 951 SVt_PVHV, TRUE, HADNV, HASARENA, FIT_ARENA(0, sizeof(xpvhv_allocated)) },
d2a0f284 952
c84c4652 953 /* 56 */
4115f141 954 { sizeof(xpvcv_allocated), sizeof(xpvcv_allocated),
c84c4652 955 + relative_STRUCT_OFFSET(xpvcv_allocated, XPVCV, xpv_cur),
10666ae3 956 SVt_PVCV, TRUE, NONV, HASARENA, FIT_ARENA(0, sizeof(xpvcv_allocated)) },
d2a0f284 957
4115f141 958 { sizeof(xpvfm_allocated), sizeof(xpvfm_allocated),
3038937b 959 + relative_STRUCT_OFFSET(xpvfm_allocated, XPVFM, xpv_cur),
10666ae3 960 SVt_PVFM, TRUE, NONV, NOARENA, FIT_ARENA(20, sizeof(xpvfm_allocated)) },
d2a0f284
JC
961
962 /* XPVIO is 84 bytes, fits 48x */
10666ae3 963 { sizeof(XPVIO), sizeof(XPVIO), 0, SVt_PVIO, TRUE, HADNV,
d2a0f284 964 HASARENA, FIT_ARENA(24, sizeof(XPVIO)) },
bd81e77b 965};
29489e7c 966
d2a0f284
JC
967#define new_body_type(sv_type) \
968 (void *)((char *)S_new_body(aTHX_ sv_type))
29489e7c 969
bd81e77b
NC
970#define del_body_type(p, sv_type) \
971 del_body(p, &PL_body_roots[sv_type])
29489e7c 972
29489e7c 973
bd81e77b 974#define new_body_allocated(sv_type) \
d2a0f284 975 (void *)((char *)S_new_body(aTHX_ sv_type) \
bd81e77b 976 - bodies_by_type[sv_type].offset)
29489e7c 977
bd81e77b
NC
978#define del_body_allocated(p, sv_type) \
979 del_body(p + bodies_by_type[sv_type].offset, &PL_body_roots[sv_type])
29489e7c 980
29489e7c 981
bd81e77b
NC
982#define my_safemalloc(s) (void*)safemalloc(s)
983#define my_safecalloc(s) (void*)safecalloc(s, 1)
984#define my_safefree(p) safefree((char*)p)
29489e7c 985
bd81e77b 986#ifdef PURIFY
29489e7c 987
bd81e77b
NC
988#define new_XNV() my_safemalloc(sizeof(XPVNV))
989#define del_XNV(p) my_safefree(p)
29489e7c 990
bd81e77b
NC
991#define new_XPVNV() my_safemalloc(sizeof(XPVNV))
992#define del_XPVNV(p) my_safefree(p)
29489e7c 993
bd81e77b
NC
994#define new_XPVAV() my_safemalloc(sizeof(XPVAV))
995#define del_XPVAV(p) my_safefree(p)
29489e7c 996
bd81e77b
NC
997#define new_XPVHV() my_safemalloc(sizeof(XPVHV))
998#define del_XPVHV(p) my_safefree(p)
29489e7c 999
bd81e77b
NC
1000#define new_XPVMG() my_safemalloc(sizeof(XPVMG))
1001#define del_XPVMG(p) my_safefree(p)
29489e7c 1002
bd81e77b
NC
1003#define new_XPVGV() my_safemalloc(sizeof(XPVGV))
1004#define del_XPVGV(p) my_safefree(p)
29489e7c 1005
bd81e77b 1006#else /* !PURIFY */
29489e7c 1007
bd81e77b
NC
1008#define new_XNV() new_body_type(SVt_NV)
1009#define del_XNV(p) del_body_type(p, SVt_NV)
29489e7c 1010
bd81e77b
NC
1011#define new_XPVNV() new_body_type(SVt_PVNV)
1012#define del_XPVNV(p) del_body_type(p, SVt_PVNV)
29489e7c 1013
bd81e77b
NC
1014#define new_XPVAV() new_body_allocated(SVt_PVAV)
1015#define del_XPVAV(p) del_body_allocated(p, SVt_PVAV)
645c22ef 1016
bd81e77b
NC
1017#define new_XPVHV() new_body_allocated(SVt_PVHV)
1018#define del_XPVHV(p) del_body_allocated(p, SVt_PVHV)
645c22ef 1019
bd81e77b
NC
1020#define new_XPVMG() new_body_type(SVt_PVMG)
1021#define del_XPVMG(p) del_body_type(p, SVt_PVMG)
645c22ef 1022
bd81e77b
NC
1023#define new_XPVGV() new_body_type(SVt_PVGV)
1024#define del_XPVGV(p) del_body_type(p, SVt_PVGV)
1d7c1841 1025
bd81e77b 1026#endif /* PURIFY */
93e68bfb 1027
bd81e77b 1028/* no arena for you! */
93e68bfb 1029
bd81e77b 1030#define new_NOARENA(details) \
d2a0f284 1031 my_safemalloc((details)->body_size + (details)->offset)
bd81e77b 1032#define new_NOARENAZ(details) \
d2a0f284
JC
1033 my_safecalloc((details)->body_size + (details)->offset)
1034
0b2d3faa 1035#if defined(DEBUGGING) && !defined(PERL_GLOBAL_STRUCT_PRIVATE)
10666ae3
NC
1036static bool done_sanity_check;
1037#endif
1038
d2a0f284
JC
1039STATIC void *
1040S_more_bodies (pTHX_ svtype sv_type)
1041{
1042 dVAR;
1043 void ** const root = &PL_body_roots[sv_type];
96a5add6 1044 const struct body_details * const bdp = &bodies_by_type[sv_type];
d2a0f284
JC
1045 const size_t body_size = bdp->body_size;
1046 char *start;
1047 const char *end;
1048
1049 assert(bdp->arena_size);
10666ae3 1050
0b2d3faa
JH
1051#if defined(DEBUGGING) && !defined(PERL_GLOBAL_STRUCT_PRIVATE)
1052 /* PERL_GLOBAL_STRUCT_PRIVATE cannot coexist with global
1053 * variables like done_sanity_check. */
10666ae3 1054 if (!done_sanity_check) {
ea471437 1055 unsigned int i = SVt_LAST;
10666ae3
NC
1056
1057 done_sanity_check = TRUE;
1058
1059 while (i--)
1060 assert (bodies_by_type[i].type == i);
1061 }
1062#endif
1063
d2a0f284
JC
1064 start = (char*) Perl_get_arena(aTHX_ bdp->arena_size);
1065
1066 end = start + bdp->arena_size - body_size;
1067
d2a0f284
JC
1068 /* computed count doesnt reflect the 1st slot reservation */
1069 DEBUG_m(PerlIO_printf(Perl_debug_log,
1070 "arena %p end %p arena-size %d type %d size %d ct %d\n",
0e84aef4
JH
1071 start, end,
1072 (int)bdp->arena_size, sv_type, (int)body_size,
1073 (int)bdp->arena_size / (int)body_size));
d2a0f284
JC
1074
1075 *root = (void *)start;
1076
1077 while (start < end) {
1078 char * const next = start + body_size;
1079 *(void**) start = (void *)next;
1080 start = next;
1081 }
1082 *(void **)start = 0;
1083
1084 return *root;
1085}
1086
1087/* grab a new thing from the free list, allocating more if necessary.
1088 The inline version is used for speed in hot routines, and the
1089 function using it serves the rest (unless PURIFY).
1090*/
1091#define new_body_inline(xpv, sv_type) \
1092 STMT_START { \
1093 void ** const r3wt = &PL_body_roots[sv_type]; \
1094 LOCK_SV_MUTEX; \
11b79775
DD
1095 xpv = (PTR_TBL_ENT_t*) (*((void **)(r3wt)) \
1096 ? *((void **)(r3wt)) : more_bodies(sv_type)); \
d2a0f284
JC
1097 *(r3wt) = *(void**)(xpv); \
1098 UNLOCK_SV_MUTEX; \
1099 } STMT_END
1100
1101#ifndef PURIFY
1102
1103STATIC void *
1104S_new_body(pTHX_ svtype sv_type)
1105{
1106 dVAR;
1107 void *xpv;
1108 new_body_inline(xpv, sv_type);
1109 return xpv;
1110}
1111
1112#endif
93e68bfb 1113
bd81e77b
NC
1114/*
1115=for apidoc sv_upgrade
93e68bfb 1116
bd81e77b
NC
1117Upgrade an SV to a more complex form. Generally adds a new body type to the
1118SV, then copies across as much information as possible from the old body.
1119You generally want to use the C<SvUPGRADE> macro wrapper. See also C<svtype>.
93e68bfb 1120
bd81e77b 1121=cut
93e68bfb 1122*/
93e68bfb 1123
bd81e77b 1124void
42d0e0b7 1125Perl_sv_upgrade(pTHX_ register SV *sv, svtype new_type)
cac9b346 1126{
97aff369 1127 dVAR;
bd81e77b
NC
1128 void* old_body;
1129 void* new_body;
42d0e0b7 1130 const svtype old_type = SvTYPE(sv);
d2a0f284 1131 const struct body_details *new_type_details;
bd81e77b
NC
1132 const struct body_details *const old_type_details
1133 = bodies_by_type + old_type;
cac9b346 1134
bd81e77b
NC
1135 if (new_type != SVt_PV && SvIsCOW(sv)) {
1136 sv_force_normal_flags(sv, 0);
1137 }
cac9b346 1138
bd81e77b
NC
1139 if (old_type == new_type)
1140 return;
cac9b346 1141
bd81e77b
NC
1142 if (old_type > new_type)
1143 Perl_croak(aTHX_ "sv_upgrade from type %d down to type %d",
1144 (int)old_type, (int)new_type);
cac9b346 1145
cac9b346 1146
bd81e77b 1147 old_body = SvANY(sv);
de042e1d 1148
bd81e77b
NC
1149 /* Copying structures onto other structures that have been neatly zeroed
1150 has a subtle gotcha. Consider XPVMG
cac9b346 1151
bd81e77b
NC
1152 +------+------+------+------+------+-------+-------+
1153 | NV | CUR | LEN | IV | MAGIC | STASH |
1154 +------+------+------+------+------+-------+-------+
1155 0 4 8 12 16 20 24 28
645c22ef 1156
bd81e77b
NC
1157 where NVs are aligned to 8 bytes, so that sizeof that structure is
1158 actually 32 bytes long, with 4 bytes of padding at the end:
08742458 1159
bd81e77b
NC
1160 +------+------+------+------+------+-------+-------+------+
1161 | NV | CUR | LEN | IV | MAGIC | STASH | ??? |
1162 +------+------+------+------+------+-------+-------+------+
1163 0 4 8 12 16 20 24 28 32
08742458 1164
bd81e77b 1165 so what happens if you allocate memory for this structure:
30f9da9e 1166
bd81e77b
NC
1167 +------+------+------+------+------+-------+-------+------+------+...
1168 | NV | CUR | LEN | IV | MAGIC | STASH | GP | NAME |
1169 +------+------+------+------+------+-------+-------+------+------+...
1170 0 4 8 12 16 20 24 28 32 36
bfc44f79 1171
bd81e77b
NC
1172 zero it, then copy sizeof(XPVMG) bytes on top of it? Not quite what you
1173 expect, because you copy the area marked ??? onto GP. Now, ??? may have
1174 started out as zero once, but it's quite possible that it isn't. So now,
1175 rather than a nicely zeroed GP, you have it pointing somewhere random.
1176 Bugs ensue.
bfc44f79 1177
bd81e77b
NC
1178 (In fact, GP ends up pointing at a previous GP structure, because the
1179 principle cause of the padding in XPVMG getting garbage is a copy of
1180 sizeof(XPVMG) bytes from a XPVGV structure in sv_unglob)
30f9da9e 1181
bd81e77b
NC
1182 So we are careful and work out the size of used parts of all the
1183 structures. */
bfc44f79 1184
bd81e77b
NC
1185 switch (old_type) {
1186 case SVt_NULL:
1187 break;
1188 case SVt_IV:
1189 if (new_type < SVt_PVIV) {
1190 new_type = (new_type == SVt_NV)
1191 ? SVt_PVNV : SVt_PVIV;
bd81e77b
NC
1192 }
1193 break;
1194 case SVt_NV:
1195 if (new_type < SVt_PVNV) {
1196 new_type = SVt_PVNV;
bd81e77b
NC
1197 }
1198 break;
1199 case SVt_RV:
1200 break;
1201 case SVt_PV:
1202 assert(new_type > SVt_PV);
1203 assert(SVt_IV < SVt_PV);
1204 assert(SVt_NV < SVt_PV);
1205 break;
1206 case SVt_PVIV:
1207 break;
1208 case SVt_PVNV:
1209 break;
1210 case SVt_PVMG:
1211 /* Because the XPVMG of PL_mess_sv isn't allocated from the arena,
1212 there's no way that it can be safely upgraded, because perl.c
1213 expects to Safefree(SvANY(PL_mess_sv)) */
1214 assert(sv != PL_mess_sv);
1215 /* This flag bit is used to mean other things in other scalar types.
1216 Given that it only has meaning inside the pad, it shouldn't be set
1217 on anything that can get upgraded. */
00b1698f 1218 assert(!SvPAD_TYPED(sv));
bd81e77b
NC
1219 break;
1220 default:
1221 if (old_type_details->cant_upgrade)
c81225bc
NC
1222 Perl_croak(aTHX_ "Can't upgrade %s (%" UVuf ") to %" UVuf,
1223 sv_reftype(sv, 0), (UV) old_type, (UV) new_type);
bd81e77b 1224 }
2fa1109b 1225 new_type_details = bodies_by_type + new_type;
645c22ef 1226
bd81e77b
NC
1227 SvFLAGS(sv) &= ~SVTYPEMASK;
1228 SvFLAGS(sv) |= new_type;
932e9ff9 1229
ab4416c0
NC
1230 /* This can't happen, as SVt_NULL is <= all values of new_type, so one of
1231 the return statements above will have triggered. */
1232 assert (new_type != SVt_NULL);
bd81e77b 1233 switch (new_type) {
bd81e77b
NC
1234 case SVt_IV:
1235 assert(old_type == SVt_NULL);
1236 SvANY(sv) = (XPVIV*)((char*)&(sv->sv_u.svu_iv) - STRUCT_OFFSET(XPVIV, xiv_iv));
1237 SvIV_set(sv, 0);
1238 return;
1239 case SVt_NV:
1240 assert(old_type == SVt_NULL);
1241 SvANY(sv) = new_XNV();
1242 SvNV_set(sv, 0);
1243 return;
1244 case SVt_RV:
1245 assert(old_type == SVt_NULL);
1246 SvANY(sv) = &sv->sv_u.svu_rv;
1247 SvRV_set(sv, 0);
1248 return;
1249 case SVt_PVHV:
bd81e77b 1250 case SVt_PVAV:
d2a0f284 1251 assert(new_type_details->body_size);
c1ae03ae
NC
1252
1253#ifndef PURIFY
1254 assert(new_type_details->arena);
d2a0f284 1255 assert(new_type_details->arena_size);
c1ae03ae 1256 /* This points to the start of the allocated area. */
d2a0f284
JC
1257 new_body_inline(new_body, new_type);
1258 Zero(new_body, new_type_details->body_size, char);
c1ae03ae
NC
1259 new_body = ((char *)new_body) - new_type_details->offset;
1260#else
1261 /* We always allocated the full length item with PURIFY. To do this
1262 we fake things so that arena is false for all 16 types.. */
1263 new_body = new_NOARENAZ(new_type_details);
1264#endif
1265 SvANY(sv) = new_body;
1266 if (new_type == SVt_PVAV) {
1267 AvMAX(sv) = -1;
1268 AvFILLp(sv) = -1;
1269 AvREAL_only(sv);
1270 }
aeb18a1e 1271
bd81e77b
NC
1272 /* SVt_NULL isn't the only thing upgraded to AV or HV.
1273 The target created by newSVrv also is, and it can have magic.
1274 However, it never has SvPVX set.
1275 */
1276 if (old_type >= SVt_RV) {
1277 assert(SvPVX_const(sv) == 0);
1278 }
aeb18a1e 1279
bd81e77b 1280 if (old_type >= SVt_PVMG) {
e736a858 1281 SvMAGIC_set(sv, ((XPVMG*)old_body)->xmg_u.xmg_magic);
bd81e77b 1282 SvSTASH_set(sv, ((XPVMG*)old_body)->xmg_stash);
797c7171
NC
1283 } else {
1284 sv->sv_u.svu_array = NULL; /* or svu_hash */
bd81e77b
NC
1285 }
1286 break;
93e68bfb 1287
93e68bfb 1288
bd81e77b
NC
1289 case SVt_PVIV:
1290 /* XXX Is this still needed? Was it ever needed? Surely as there is
1291 no route from NV to PVIV, NOK can never be true */
1292 assert(!SvNOKp(sv));
1293 assert(!SvNOK(sv));
1294 case SVt_PVIO:
1295 case SVt_PVFM:
1296 case SVt_PVBM:
1297 case SVt_PVGV:
1298 case SVt_PVCV:
1299 case SVt_PVLV:
1300 case SVt_PVMG:
1301 case SVt_PVNV:
1302 case SVt_PV:
93e68bfb 1303
d2a0f284 1304 assert(new_type_details->body_size);
bd81e77b
NC
1305 /* We always allocated the full length item with PURIFY. To do this
1306 we fake things so that arena is false for all 16 types.. */
1307 if(new_type_details->arena) {
1308 /* This points to the start of the allocated area. */
d2a0f284
JC
1309 new_body_inline(new_body, new_type);
1310 Zero(new_body, new_type_details->body_size, char);
bd81e77b
NC
1311 new_body = ((char *)new_body) - new_type_details->offset;
1312 } else {
1313 new_body = new_NOARENAZ(new_type_details);
1314 }
1315 SvANY(sv) = new_body;
5e2fc214 1316
bd81e77b 1317 if (old_type_details->copy) {
f9ba3d20
NC
1318 /* There is now the potential for an upgrade from something without
1319 an offset (PVNV or PVMG) to something with one (PVCV, PVFM) */
1320 int offset = old_type_details->offset;
1321 int length = old_type_details->copy;
1322
1323 if (new_type_details->offset > old_type_details->offset) {
d4c19fe8 1324 const int difference
f9ba3d20
NC
1325 = new_type_details->offset - old_type_details->offset;
1326 offset += difference;
1327 length -= difference;
1328 }
1329 assert (length >= 0);
1330
1331 Copy((char *)old_body + offset, (char *)new_body + offset, length,
1332 char);
bd81e77b
NC
1333 }
1334
1335#ifndef NV_ZERO_IS_ALLBITS_ZERO
f2524eef 1336 /* If NV 0.0 is stores as all bits 0 then Zero() already creates a
e5ce394c
NC
1337 * correct 0.0 for us. Otherwise, if the old body didn't have an
1338 * NV slot, but the new one does, then we need to initialise the
1339 * freshly created NV slot with whatever the correct bit pattern is
1340 * for 0.0 */
1341 if (old_type_details->zero_nv && !new_type_details->zero_nv)
bd81e77b 1342 SvNV_set(sv, 0);
82048762 1343#endif
5e2fc214 1344
bd81e77b 1345 if (new_type == SVt_PVIO)
f2524eef 1346 IoPAGE_LEN(sv) = 60;
bd81e77b 1347 if (old_type < SVt_RV)
6136c704 1348 SvPV_set(sv, NULL);
bd81e77b
NC
1349 break;
1350 default:
afd78fd5
JH
1351 Perl_croak(aTHX_ "panic: sv_upgrade to unknown type %lu",
1352 (unsigned long)new_type);
bd81e77b 1353 }
73171d91 1354
d2a0f284
JC
1355 if (old_type_details->arena) {
1356 /* If there was an old body, then we need to free it.
1357 Note that there is an assumption that all bodies of types that
1358 can be upgraded came from arenas. Only the more complex non-
1359 upgradable types are allowed to be directly malloc()ed. */
bd81e77b
NC
1360#ifdef PURIFY
1361 my_safefree(old_body);
1362#else
1363 del_body((void*)((char*)old_body + old_type_details->offset),
1364 &PL_body_roots[old_type]);
1365#endif
1366 }
1367}
73171d91 1368
bd81e77b
NC
1369/*
1370=for apidoc sv_backoff
73171d91 1371
bd81e77b
NC
1372Remove any string offset. You should normally use the C<SvOOK_off> macro
1373wrapper instead.
73171d91 1374
bd81e77b 1375=cut
73171d91
NC
1376*/
1377
bd81e77b
NC
1378int
1379Perl_sv_backoff(pTHX_ register SV *sv)
1380{
96a5add6 1381 PERL_UNUSED_CONTEXT;
bd81e77b
NC
1382 assert(SvOOK(sv));
1383 assert(SvTYPE(sv) != SVt_PVHV);
1384 assert(SvTYPE(sv) != SVt_PVAV);
1385 if (SvIVX(sv)) {
1386 const char * const s = SvPVX_const(sv);
1387 SvLEN_set(sv, SvLEN(sv) + SvIVX(sv));
1388 SvPV_set(sv, SvPVX(sv) - SvIVX(sv));
1389 SvIV_set(sv, 0);
1390 Move(s, SvPVX(sv), SvCUR(sv)+1, char);
1391 }
1392 SvFLAGS(sv) &= ~SVf_OOK;
1393 return 0;
1394}
73171d91 1395
bd81e77b
NC
1396/*
1397=for apidoc sv_grow
73171d91 1398
bd81e77b
NC
1399Expands the character buffer in the SV. If necessary, uses C<sv_unref> and
1400upgrades the SV to C<SVt_PV>. Returns a pointer to the character buffer.
1401Use the C<SvGROW> wrapper instead.
93e68bfb 1402
bd81e77b
NC
1403=cut
1404*/
93e68bfb 1405
bd81e77b
NC
1406char *
1407Perl_sv_grow(pTHX_ register SV *sv, register STRLEN newlen)
1408{
1409 register char *s;
93e68bfb 1410
5db06880
NC
1411 if (PL_madskills && newlen >= 0x100000) {
1412 PerlIO_printf(Perl_debug_log,
1413 "Allocation too large: %"UVxf"\n", (UV)newlen);
1414 }
bd81e77b
NC
1415#ifdef HAS_64K_LIMIT
1416 if (newlen >= 0x10000) {
1417 PerlIO_printf(Perl_debug_log,
1418 "Allocation too large: %"UVxf"\n", (UV)newlen);
1419 my_exit(1);
1420 }
1421#endif /* HAS_64K_LIMIT */
1422 if (SvROK(sv))
1423 sv_unref(sv);
1424 if (SvTYPE(sv) < SVt_PV) {
1425 sv_upgrade(sv, SVt_PV);
1426 s = SvPVX_mutable(sv);
1427 }
1428 else if (SvOOK(sv)) { /* pv is offset? */
1429 sv_backoff(sv);
1430 s = SvPVX_mutable(sv);
1431 if (newlen > SvLEN(sv))
1432 newlen += 10 * (newlen - SvCUR(sv)); /* avoid copy each time */
1433#ifdef HAS_64K_LIMIT
1434 if (newlen >= 0x10000)
1435 newlen = 0xFFFF;
1436#endif
1437 }
1438 else
1439 s = SvPVX_mutable(sv);
aeb18a1e 1440
bd81e77b
NC
1441 if (newlen > SvLEN(sv)) { /* need more room? */
1442 newlen = PERL_STRLEN_ROUNDUP(newlen);
1443 if (SvLEN(sv) && s) {
1444#ifdef MYMALLOC
1445 const STRLEN l = malloced_size((void*)SvPVX_const(sv));
1446 if (newlen <= l) {
1447 SvLEN_set(sv, l);
1448 return s;
1449 } else
1450#endif
10edeb5d 1451 s = (char*)saferealloc(s, newlen);
bd81e77b
NC
1452 }
1453 else {
10edeb5d 1454 s = (char*)safemalloc(newlen);
bd81e77b
NC
1455 if (SvPVX_const(sv) && SvCUR(sv)) {
1456 Move(SvPVX_const(sv), s, (newlen < SvCUR(sv)) ? newlen : SvCUR(sv), char);
1457 }
1458 }
1459 SvPV_set(sv, s);
1460 SvLEN_set(sv, newlen);
1461 }
1462 return s;
1463}
aeb18a1e 1464
bd81e77b
NC
1465/*
1466=for apidoc sv_setiv
932e9ff9 1467
bd81e77b
NC
1468Copies an integer into the given SV, upgrading first if necessary.
1469Does not handle 'set' magic. See also C<sv_setiv_mg>.
463ee0b2 1470
bd81e77b
NC
1471=cut
1472*/
463ee0b2 1473
bd81e77b
NC
1474void
1475Perl_sv_setiv(pTHX_ register SV *sv, IV i)
1476{
97aff369 1477 dVAR;
bd81e77b
NC
1478 SV_CHECK_THINKFIRST_COW_DROP(sv);
1479 switch (SvTYPE(sv)) {
1480 case SVt_NULL:
1481 sv_upgrade(sv, SVt_IV);
1482 break;
1483 case SVt_NV:
1484 sv_upgrade(sv, SVt_PVNV);
1485 break;
1486 case SVt_RV:
1487 case SVt_PV:
1488 sv_upgrade(sv, SVt_PVIV);
1489 break;
463ee0b2 1490
bd81e77b
NC
1491 case SVt_PVGV:
1492 case SVt_PVAV:
1493 case SVt_PVHV:
1494 case SVt_PVCV:
1495 case SVt_PVFM:
1496 case SVt_PVIO:
1497 Perl_croak(aTHX_ "Can't coerce %s to integer in %s", sv_reftype(sv,0),
1498 OP_DESC(PL_op));
42d0e0b7 1499 default: NOOP;
bd81e77b
NC
1500 }
1501 (void)SvIOK_only(sv); /* validate number */
1502 SvIV_set(sv, i);
1503 SvTAINT(sv);
1504}
932e9ff9 1505
bd81e77b
NC
1506/*
1507=for apidoc sv_setiv_mg
d33b2eba 1508
bd81e77b 1509Like C<sv_setiv>, but also handles 'set' magic.
1c846c1f 1510
bd81e77b
NC
1511=cut
1512*/
d33b2eba 1513
bd81e77b
NC
1514void
1515Perl_sv_setiv_mg(pTHX_ register SV *sv, IV i)
1516{
1517 sv_setiv(sv,i);
1518 SvSETMAGIC(sv);
1519}
727879eb 1520
bd81e77b
NC
1521/*
1522=for apidoc sv_setuv
d33b2eba 1523
bd81e77b
NC
1524Copies an unsigned integer into the given SV, upgrading first if necessary.
1525Does not handle 'set' magic. See also C<sv_setuv_mg>.
9b94d1dd 1526
bd81e77b
NC
1527=cut
1528*/
d33b2eba 1529
bd81e77b
NC
1530void
1531Perl_sv_setuv(pTHX_ register SV *sv, UV u)
1532{
1533 /* With these two if statements:
1534 u=1.49 s=0.52 cu=72.49 cs=10.64 scripts=270 tests=20865
d33b2eba 1535
bd81e77b
NC
1536 without
1537 u=1.35 s=0.47 cu=73.45 cs=11.43 scripts=270 tests=20865
1c846c1f 1538
bd81e77b
NC
1539 If you wish to remove them, please benchmark to see what the effect is
1540 */
1541 if (u <= (UV)IV_MAX) {
1542 sv_setiv(sv, (IV)u);
1543 return;
1544 }
1545 sv_setiv(sv, 0);
1546 SvIsUV_on(sv);
1547 SvUV_set(sv, u);
1548}
d33b2eba 1549
bd81e77b
NC
1550/*
1551=for apidoc sv_setuv_mg
727879eb 1552
bd81e77b 1553Like C<sv_setuv>, but also handles 'set' magic.
9b94d1dd 1554
bd81e77b
NC
1555=cut
1556*/
5e2fc214 1557
bd81e77b
NC
1558void
1559Perl_sv_setuv_mg(pTHX_ register SV *sv, UV u)
1560{
bd81e77b
NC
1561 sv_setuv(sv,u);
1562 SvSETMAGIC(sv);
1563}
5e2fc214 1564
954c1994 1565/*
bd81e77b 1566=for apidoc sv_setnv
954c1994 1567
bd81e77b
NC
1568Copies a double into the given SV, upgrading first if necessary.
1569Does not handle 'set' magic. See also C<sv_setnv_mg>.
954c1994
GS
1570
1571=cut
1572*/
1573
63f97190 1574void
bd81e77b 1575Perl_sv_setnv(pTHX_ register SV *sv, NV num)
79072805 1576{
97aff369 1577 dVAR;
bd81e77b
NC
1578 SV_CHECK_THINKFIRST_COW_DROP(sv);
1579 switch (SvTYPE(sv)) {
79072805 1580 case SVt_NULL:
79072805 1581 case SVt_IV:
bd81e77b 1582 sv_upgrade(sv, SVt_NV);
79072805 1583 break;
ed6116ce 1584 case SVt_RV:
79072805 1585 case SVt_PV:
79072805 1586 case SVt_PVIV:
bd81e77b 1587 sv_upgrade(sv, SVt_PVNV);
79072805 1588 break;
bd4b1eb5 1589
bd4b1eb5 1590 case SVt_PVGV:
bd81e77b
NC
1591 case SVt_PVAV:
1592 case SVt_PVHV:
79072805 1593 case SVt_PVCV:
bd81e77b
NC
1594 case SVt_PVFM:
1595 case SVt_PVIO:
1596 Perl_croak(aTHX_ "Can't coerce %s to number in %s", sv_reftype(sv,0),
1597 OP_NAME(PL_op));
42d0e0b7 1598 default: NOOP;
2068cd4d 1599 }
bd81e77b
NC
1600 SvNV_set(sv, num);
1601 (void)SvNOK_only(sv); /* validate number */
1602 SvTAINT(sv);
79072805
LW
1603}
1604
645c22ef 1605/*
bd81e77b 1606=for apidoc sv_setnv_mg
645c22ef 1607
bd81e77b 1608Like C<sv_setnv>, but also handles 'set' magic.
645c22ef
DM
1609
1610=cut
1611*/
1612
bd81e77b
NC
1613void
1614Perl_sv_setnv_mg(pTHX_ register SV *sv, NV num)
79072805 1615{
bd81e77b
NC
1616 sv_setnv(sv,num);
1617 SvSETMAGIC(sv);
79072805
LW
1618}
1619
bd81e77b
NC
1620/* Print an "isn't numeric" warning, using a cleaned-up,
1621 * printable version of the offending string
1622 */
954c1994 1623
bd81e77b
NC
1624STATIC void
1625S_not_a_number(pTHX_ SV *sv)
79072805 1626{
97aff369 1627 dVAR;
bd81e77b
NC
1628 SV *dsv;
1629 char tmpbuf[64];
1630 const char *pv;
94463019
JH
1631
1632 if (DO_UTF8(sv)) {
396482e1 1633 dsv = sv_2mortal(newSVpvs(""));
94463019
JH
1634 pv = sv_uni_display(dsv, sv, 10, 0);
1635 } else {
1636 char *d = tmpbuf;
551405c4 1637 const char * const limit = tmpbuf + sizeof(tmpbuf) - 8;
94463019
JH
1638 /* each *s can expand to 4 chars + "...\0",
1639 i.e. need room for 8 chars */
ecdeb87c 1640
00b6aa41
AL
1641 const char *s = SvPVX_const(sv);
1642 const char * const end = s + SvCUR(sv);
1643 for ( ; s < end && d < limit; s++ ) {
94463019
JH
1644 int ch = *s & 0xFF;
1645 if (ch & 128 && !isPRINT_LC(ch)) {
1646 *d++ = 'M';
1647 *d++ = '-';
1648 ch &= 127;
1649 }
1650 if (ch == '\n') {
1651 *d++ = '\\';
1652 *d++ = 'n';
1653 }
1654 else if (ch == '\r') {
1655 *d++ = '\\';
1656 *d++ = 'r';
1657 }
1658 else if (ch == '\f') {
1659 *d++ = '\\';
1660 *d++ = 'f';
1661 }
1662 else if (ch == '\\') {
1663 *d++ = '\\';
1664 *d++ = '\\';
1665 }
1666 else if (ch == '\0') {
1667 *d++ = '\\';
1668 *d++ = '0';
1669 }
1670 else if (isPRINT_LC(ch))
1671 *d++ = ch;
1672 else {
1673 *d++ = '^';
1674 *d++ = toCTRL(ch);
1675 }
1676 }
1677 if (s < end) {
1678 *d++ = '.';
1679 *d++ = '.';
1680 *d++ = '.';
1681 }
1682 *d = '\0';
1683 pv = tmpbuf;
a0d0e21e 1684 }
a0d0e21e 1685
533c011a 1686 if (PL_op)
9014280d 1687 Perl_warner(aTHX_ packWARN(WARN_NUMERIC),
94463019
JH
1688 "Argument \"%s\" isn't numeric in %s", pv,
1689 OP_DESC(PL_op));
a0d0e21e 1690 else
9014280d 1691 Perl_warner(aTHX_ packWARN(WARN_NUMERIC),
94463019 1692 "Argument \"%s\" isn't numeric", pv);
a0d0e21e
LW
1693}
1694
c2988b20
NC
1695/*
1696=for apidoc looks_like_number
1697
645c22ef
DM
1698Test if the content of an SV looks like a number (or is a number).
1699C<Inf> and C<Infinity> are treated as numbers (so will not issue a
1700non-numeric warning), even if your atof() doesn't grok them.
c2988b20
NC
1701
1702=cut
1703*/
1704
1705I32
1706Perl_looks_like_number(pTHX_ SV *sv)
1707{
a3b680e6 1708 register const char *sbegin;
c2988b20
NC
1709 STRLEN len;
1710
1711 if (SvPOK(sv)) {
3f7c398e 1712 sbegin = SvPVX_const(sv);
c2988b20
NC
1713 len = SvCUR(sv);
1714 }
1715 else if (SvPOKp(sv))
83003860 1716 sbegin = SvPV_const(sv, len);
c2988b20 1717 else
e0ab1c0e 1718 return SvFLAGS(sv) & (SVf_NOK|SVp_NOK|SVf_IOK|SVp_IOK);
c2988b20
NC
1719 return grok_number(sbegin, len, NULL);
1720}
25da4f38 1721
19f6321d
NC
1722STATIC bool
1723S_glob_2number(pTHX_ GV * const gv)
180488f8
NC
1724{
1725 const U32 wasfake = SvFLAGS(gv) & SVf_FAKE;
1726 SV *const buffer = sv_newmortal();
1727
1728 /* FAKE globs can get coerced, so need to turn this off temporarily if it
1729 is on. */
1730 SvFAKE_off(gv);
1731 gv_efullname3(buffer, gv, "*");
1732 SvFLAGS(gv) |= wasfake;
1733
675c862f
AL
1734 /* We know that all GVs stringify to something that is not-a-number,
1735 so no need to test that. */
1736 if (ckWARN(WARN_NUMERIC))
1737 not_a_number(buffer);
1738 /* We just want something true to return, so that S_sv_2iuv_common
1739 can tail call us and return true. */
19f6321d 1740 return TRUE;
675c862f
AL
1741}
1742
1743STATIC char *
19f6321d 1744S_glob_2pv(pTHX_ GV * const gv, STRLEN * const len)
675c862f
AL
1745{
1746 const U32 wasfake = SvFLAGS(gv) & SVf_FAKE;
1747 SV *const buffer = sv_newmortal();
1748
1749 /* FAKE globs can get coerced, so need to turn this off temporarily if it
1750 is on. */
1751 SvFAKE_off(gv);
1752 gv_efullname3(buffer, gv, "*");
1753 SvFLAGS(gv) |= wasfake;
1754
1755 assert(SvPOK(buffer));
a6d61a6c
NC
1756 if (len) {
1757 *len = SvCUR(buffer);
1758 }
675c862f 1759 return SvPVX(buffer);
180488f8
NC
1760}
1761
25da4f38
IZ
1762/* Actually, ISO C leaves conversion of UV to IV undefined, but
1763 until proven guilty, assume that things are not that bad... */
1764
645c22ef
DM
1765/*
1766 NV_PRESERVES_UV:
1767
1768 As 64 bit platforms often have an NV that doesn't preserve all bits of
28e5dec8
JH
1769 an IV (an assumption perl has been based on to date) it becomes necessary
1770 to remove the assumption that the NV always carries enough precision to
1771 recreate the IV whenever needed, and that the NV is the canonical form.
1772 Instead, IV/UV and NV need to be given equal rights. So as to not lose
645c22ef 1773 precision as a side effect of conversion (which would lead to insanity
28e5dec8
JH
1774 and the dragon(s) in t/op/numconvert.t getting very angry) the intent is
1775 1) to distinguish between IV/UV/NV slots that have cached a valid
1776 conversion where precision was lost and IV/UV/NV slots that have a
1777 valid conversion which has lost no precision
645c22ef 1778 2) to ensure that if a numeric conversion to one form is requested that
28e5dec8
JH
1779 would lose precision, the precise conversion (or differently
1780 imprecise conversion) is also performed and cached, to prevent
1781 requests for different numeric formats on the same SV causing
1782 lossy conversion chains. (lossless conversion chains are perfectly
1783 acceptable (still))
1784
1785
1786 flags are used:
1787 SvIOKp is true if the IV slot contains a valid value
1788 SvIOK is true only if the IV value is accurate (UV if SvIOK_UV true)
1789 SvNOKp is true if the NV slot contains a valid value
1790 SvNOK is true only if the NV value is accurate
1791
1792 so
645c22ef 1793 while converting from PV to NV, check to see if converting that NV to an
28e5dec8
JH
1794 IV(or UV) would lose accuracy over a direct conversion from PV to
1795 IV(or UV). If it would, cache both conversions, return NV, but mark
1796 SV as IOK NOKp (ie not NOK).
1797
645c22ef 1798 While converting from PV to IV, check to see if converting that IV to an
28e5dec8
JH
1799 NV would lose accuracy over a direct conversion from PV to NV. If it
1800 would, cache both conversions, flag similarly.
1801
1802 Before, the SV value "3.2" could become NV=3.2 IV=3 NOK, IOK quite
1803 correctly because if IV & NV were set NV *always* overruled.
645c22ef
DM
1804 Now, "3.2" will become NV=3.2 IV=3 NOK, IOKp, because the flag's meaning
1805 changes - now IV and NV together means that the two are interchangeable:
28e5dec8 1806 SvIVX == (IV) SvNVX && SvNVX == (NV) SvIVX;
d460ef45 1807
645c22ef
DM
1808 The benefit of this is that operations such as pp_add know that if
1809 SvIOK is true for both left and right operands, then integer addition
1810 can be used instead of floating point (for cases where the result won't
1811 overflow). Before, floating point was always used, which could lead to
28e5dec8
JH
1812 loss of precision compared with integer addition.
1813
1814 * making IV and NV equal status should make maths accurate on 64 bit
1815 platforms
1816 * may speed up maths somewhat if pp_add and friends start to use
645c22ef 1817 integers when possible instead of fp. (Hopefully the overhead in
28e5dec8
JH
1818 looking for SvIOK and checking for overflow will not outweigh the
1819 fp to integer speedup)
1820 * will slow down integer operations (callers of SvIV) on "inaccurate"
1821 values, as the change from SvIOK to SvIOKp will cause a call into
1822 sv_2iv each time rather than a macro access direct to the IV slot
1823 * should speed up number->string conversion on integers as IV is
645c22ef 1824 favoured when IV and NV are equally accurate
28e5dec8
JH
1825
1826 ####################################################################
645c22ef
DM
1827 You had better be using SvIOK_notUV if you want an IV for arithmetic:
1828 SvIOK is true if (IV or UV), so you might be getting (IV)SvUV.
1829 On the other hand, SvUOK is true iff UV.
28e5dec8
JH
1830 ####################################################################
1831
645c22ef 1832 Your mileage will vary depending your CPU's relative fp to integer
28e5dec8
JH
1833 performance ratio.
1834*/
1835
1836#ifndef NV_PRESERVES_UV
645c22ef
DM
1837# define IS_NUMBER_UNDERFLOW_IV 1
1838# define IS_NUMBER_UNDERFLOW_UV 2
1839# define IS_NUMBER_IV_AND_UV 2
1840# define IS_NUMBER_OVERFLOW_IV 4
1841# define IS_NUMBER_OVERFLOW_UV 5
1842
1843/* sv_2iuv_non_preserve(): private routine for use by sv_2iv() and sv_2uv() */
28e5dec8
JH
1844
1845/* For sv_2nv these three cases are "SvNOK and don't bother casting" */
1846STATIC int
645c22ef 1847S_sv_2iuv_non_preserve(pTHX_ register SV *sv, I32 numtype)
28e5dec8 1848{
97aff369 1849 dVAR;
b57a0404 1850 PERL_UNUSED_ARG(numtype); /* Used only under DEBUGGING? */
3f7c398e 1851 DEBUG_c(PerlIO_printf(Perl_debug_log,"sv_2iuv_non '%s', IV=0x%"UVxf" NV=%"NVgf" inttype=%"UVXf"\n", SvPVX_const(sv), SvIVX(sv), SvNVX(sv), (UV)numtype));
28e5dec8
JH
1852 if (SvNVX(sv) < (NV)IV_MIN) {
1853 (void)SvIOKp_on(sv);
1854 (void)SvNOK_on(sv);
45977657 1855 SvIV_set(sv, IV_MIN);
28e5dec8
JH
1856 return IS_NUMBER_UNDERFLOW_IV;
1857 }
1858 if (SvNVX(sv) > (NV)UV_MAX) {
1859 (void)SvIOKp_on(sv);
1860 (void)SvNOK_on(sv);
1861 SvIsUV_on(sv);
607fa7f2 1862 SvUV_set(sv, UV_MAX);
28e5dec8
JH
1863 return IS_NUMBER_OVERFLOW_UV;
1864 }
c2988b20
NC
1865 (void)SvIOKp_on(sv);
1866 (void)SvNOK_on(sv);
1867 /* Can't use strtol etc to convert this string. (See truth table in
1868 sv_2iv */
1869 if (SvNVX(sv) <= (UV)IV_MAX) {
45977657 1870 SvIV_set(sv, I_V(SvNVX(sv)));
c2988b20
NC
1871 if ((NV)(SvIVX(sv)) == SvNVX(sv)) {
1872 SvIOK_on(sv); /* Integer is precise. NOK, IOK */
1873 } else {
1874 /* Integer is imprecise. NOK, IOKp */
1875 }
1876 return SvNVX(sv) < 0 ? IS_NUMBER_UNDERFLOW_UV : IS_NUMBER_IV_AND_UV;
1877 }
1878 SvIsUV_on(sv);
607fa7f2 1879 SvUV_set(sv, U_V(SvNVX(sv)));
c2988b20
NC
1880 if ((NV)(SvUVX(sv)) == SvNVX(sv)) {
1881 if (SvUVX(sv) == UV_MAX) {
1882 /* As we know that NVs don't preserve UVs, UV_MAX cannot
1883 possibly be preserved by NV. Hence, it must be overflow.
1884 NOK, IOKp */
1885 return IS_NUMBER_OVERFLOW_UV;
1886 }
1887 SvIOK_on(sv); /* Integer is precise. NOK, UOK */
1888 } else {
1889 /* Integer is imprecise. NOK, IOKp */
28e5dec8 1890 }
c2988b20 1891 return IS_NUMBER_OVERFLOW_IV;
28e5dec8 1892}
645c22ef
DM
1893#endif /* !NV_PRESERVES_UV*/
1894
af359546
NC
1895STATIC bool
1896S_sv_2iuv_common(pTHX_ SV *sv) {
97aff369 1897 dVAR;
af359546 1898 if (SvNOKp(sv)) {
28e5dec8
JH
1899 /* erm. not sure. *should* never get NOKp (without NOK) from sv_2nv
1900 * without also getting a cached IV/UV from it at the same time
1901 * (ie PV->NV conversion should detect loss of accuracy and cache
af359546
NC
1902 * IV or UV at same time to avoid this. */
1903 /* IV-over-UV optimisation - choose to cache IV if possible */
25da4f38
IZ
1904
1905 if (SvTYPE(sv) == SVt_NV)
1906 sv_upgrade(sv, SVt_PVNV);
1907
28e5dec8
JH
1908 (void)SvIOKp_on(sv); /* Must do this first, to clear any SvOOK */
1909 /* < not <= as for NV doesn't preserve UV, ((NV)IV_MAX+1) will almost
1910 certainly cast into the IV range at IV_MAX, whereas the correct
1911 answer is the UV IV_MAX +1. Hence < ensures that dodgy boundary
1912 cases go to UV */
cab190d4
JD
1913#if defined(NAN_COMPARE_BROKEN) && defined(Perl_isnan)
1914 if (Perl_isnan(SvNVX(sv))) {
1915 SvUV_set(sv, 0);
1916 SvIsUV_on(sv);
fdbe6d7c 1917 return FALSE;
cab190d4 1918 }
cab190d4 1919#endif
28e5dec8 1920 if (SvNVX(sv) < (NV)IV_MAX + 0.5) {
45977657 1921 SvIV_set(sv, I_V(SvNVX(sv)));
28e5dec8
JH
1922 if (SvNVX(sv) == (NV) SvIVX(sv)
1923#ifndef NV_PRESERVES_UV
1924 && (((UV)1 << NV_PRESERVES_UV_BITS) >
1925 (UV)(SvIVX(sv) > 0 ? SvIVX(sv) : -SvIVX(sv)))
1926 /* Don't flag it as "accurately an integer" if the number
1927 came from a (by definition imprecise) NV operation, and
1928 we're outside the range of NV integer precision */
1929#endif
1930 ) {
1931 SvIOK_on(sv); /* Can this go wrong with rounding? NWC */
1932 DEBUG_c(PerlIO_printf(Perl_debug_log,
7234c960 1933 "0x%"UVxf" iv(%"NVgf" => %"IVdf") (precise)\n",
28e5dec8
JH
1934 PTR2UV(sv),
1935 SvNVX(sv),
1936 SvIVX(sv)));
1937
1938 } else {
1939 /* IV not precise. No need to convert from PV, as NV
1940 conversion would already have cached IV if it detected
1941 that PV->IV would be better than PV->NV->IV
1942 flags already correct - don't set public IOK. */
1943 DEBUG_c(PerlIO_printf(Perl_debug_log,
7234c960 1944 "0x%"UVxf" iv(%"NVgf" => %"IVdf") (imprecise)\n",
28e5dec8
JH
1945 PTR2UV(sv),
1946 SvNVX(sv),
1947 SvIVX(sv)));
1948 }
1949 /* Can the above go wrong if SvIVX == IV_MIN and SvNVX < IV_MIN,
1950 but the cast (NV)IV_MIN rounds to a the value less (more
1951 negative) than IV_MIN which happens to be equal to SvNVX ??
1952 Analogous to 0xFFFFFFFFFFFFFFFF rounding up to NV (2**64) and
1953 NV rounding back to 0xFFFFFFFFFFFFFFFF, so UVX == UV(NVX) and
1954 (NV)UVX == NVX are both true, but the values differ. :-(
1955 Hopefully for 2s complement IV_MIN is something like
1956 0x8000000000000000 which will be exact. NWC */
d460ef45 1957 }
25da4f38 1958 else {
607fa7f2 1959 SvUV_set(sv, U_V(SvNVX(sv)));
28e5dec8
JH
1960 if (
1961 (SvNVX(sv) == (NV) SvUVX(sv))
1962#ifndef NV_PRESERVES_UV
1963 /* Make sure it's not 0xFFFFFFFFFFFFFFFF */
1964 /*&& (SvUVX(sv) != UV_MAX) irrelevant with code below */
1965 && (((UV)1 << NV_PRESERVES_UV_BITS) > SvUVX(sv))
1966 /* Don't flag it as "accurately an integer" if the number
1967 came from a (by definition imprecise) NV operation, and
1968 we're outside the range of NV integer precision */
1969#endif
1970 )
1971 SvIOK_on(sv);
25da4f38 1972 SvIsUV_on(sv);
1c846c1f 1973 DEBUG_c(PerlIO_printf(Perl_debug_log,
57def98f 1974 "0x%"UVxf" 2iv(%"UVuf" => %"IVdf") (as unsigned)\n",
56431972 1975 PTR2UV(sv),
57def98f
JH
1976 SvUVX(sv),
1977 SvUVX(sv)));
25da4f38 1978 }
748a9306
LW
1979 }
1980 else if (SvPOKp(sv) && SvLEN(sv)) {
c2988b20 1981 UV value;
504618e9 1982 const int numtype = grok_number(SvPVX_const(sv), SvCUR(sv), &value);
af359546 1983 /* We want to avoid a possible problem when we cache an IV/ a UV which
25da4f38 1984 may be later translated to an NV, and the resulting NV is not
c2988b20
NC
1985 the same as the direct translation of the initial string
1986 (eg 123.456 can shortcut to the IV 123 with atol(), but we must
1987 be careful to ensure that the value with the .456 is around if the
1988 NV value is requested in the future).
1c846c1f 1989
af359546 1990 This means that if we cache such an IV/a UV, we need to cache the
25da4f38 1991 NV as well. Moreover, we trade speed for space, and do not
28e5dec8 1992 cache the NV if we are sure it's not needed.
25da4f38 1993 */
16b7a9a4 1994
c2988b20
NC
1995 /* SVt_PVNV is one higher than SVt_PVIV, hence this order */
1996 if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT))
1997 == IS_NUMBER_IN_UV) {
5e045b90 1998 /* It's definitely an integer, only upgrade to PVIV */
28e5dec8
JH
1999 if (SvTYPE(sv) < SVt_PVIV)
2000 sv_upgrade(sv, SVt_PVIV);
f7bbb42a 2001 (void)SvIOK_on(sv);
c2988b20
NC
2002 } else if (SvTYPE(sv) < SVt_PVNV)
2003 sv_upgrade(sv, SVt_PVNV);
28e5dec8 2004
f2524eef 2005 /* If NVs preserve UVs then we only use the UV value if we know that
c2988b20
NC
2006 we aren't going to call atof() below. If NVs don't preserve UVs
2007 then the value returned may have more precision than atof() will
2008 return, even though value isn't perfectly accurate. */
2009 if ((numtype & (IS_NUMBER_IN_UV
2010#ifdef NV_PRESERVES_UV
2011 | IS_NUMBER_NOT_INT
2012#endif
2013 )) == IS_NUMBER_IN_UV) {
2014 /* This won't turn off the public IOK flag if it was set above */
2015 (void)SvIOKp_on(sv);
2016
2017 if (!(numtype & IS_NUMBER_NEG)) {
2018 /* positive */;
2019 if (value <= (UV)IV_MAX) {
45977657 2020 SvIV_set(sv, (IV)value);
c2988b20 2021 } else {
af359546 2022 /* it didn't overflow, and it was positive. */
607fa7f2 2023 SvUV_set(sv, value);
c2988b20
NC
2024 SvIsUV_on(sv);
2025 }
2026 } else {
2027 /* 2s complement assumption */
2028 if (value <= (UV)IV_MIN) {
45977657 2029 SvIV_set(sv, -(IV)value);
c2988b20
NC
2030 } else {
2031 /* Too negative for an IV. This is a double upgrade, but
d1be9408 2032 I'm assuming it will be rare. */
c2988b20
NC
2033 if (SvTYPE(sv) < SVt_PVNV)
2034 sv_upgrade(sv, SVt_PVNV);
2035 SvNOK_on(sv);
2036 SvIOK_off(sv);
2037 SvIOKp_on(sv);
9d6ce603 2038 SvNV_set(sv, -(NV)value);
45977657 2039 SvIV_set(sv, IV_MIN);
c2988b20
NC
2040 }
2041 }
2042 }
2043 /* For !NV_PRESERVES_UV and IS_NUMBER_IN_UV and IS_NUMBER_NOT_INT we
2044 will be in the previous block to set the IV slot, and the next
2045 block to set the NV slot. So no else here. */
2046
2047 if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT))
2048 != IS_NUMBER_IN_UV) {
2049 /* It wasn't an (integer that doesn't overflow the UV). */
3f7c398e 2050 SvNV_set(sv, Atof(SvPVX_const(sv)));
28e5dec8 2051
c2988b20
NC
2052 if (! numtype && ckWARN(WARN_NUMERIC))
2053 not_a_number(sv);
28e5dec8 2054
65202027 2055#if defined(USE_LONG_DOUBLE)
c2988b20
NC
2056 DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2iv(%" PERL_PRIgldbl ")\n",
2057 PTR2UV(sv), SvNVX(sv)));
65202027 2058#else
1779d84d 2059 DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2iv(%"NVgf")\n",
c2988b20 2060 PTR2UV(sv), SvNVX(sv)));
65202027 2061#endif
28e5dec8 2062
28e5dec8 2063#ifdef NV_PRESERVES_UV
af359546
NC
2064 (void)SvIOKp_on(sv);
2065 (void)SvNOK_on(sv);
2066 if (SvNVX(sv) < (NV)IV_MAX + 0.5) {
2067 SvIV_set(sv, I_V(SvNVX(sv)));
2068 if ((NV)(SvIVX(sv)) == SvNVX(sv)) {
2069 SvIOK_on(sv);
2070 } else {
6f207bd3 2071 NOOP; /* Integer is imprecise. NOK, IOKp */
af359546
NC
2072 }
2073 /* UV will not work better than IV */
2074 } else {
2075 if (SvNVX(sv) > (NV)UV_MAX) {
2076 SvIsUV_on(sv);
2077 /* Integer is inaccurate. NOK, IOKp, is UV */
2078 SvUV_set(sv, UV_MAX);
af359546
NC
2079 } else {
2080 SvUV_set(sv, U_V(SvNVX(sv)));
2081 /* 0xFFFFFFFFFFFFFFFF not an issue in here, NVs
2082 NV preservse UV so can do correct comparison. */
2083 if ((NV)(SvUVX(sv)) == SvNVX(sv)) {
2084 SvIOK_on(sv);
af359546 2085 } else {
6f207bd3 2086 NOOP; /* Integer is imprecise. NOK, IOKp, is UV */
af359546
NC
2087 }
2088 }
4b0c9573 2089 SvIsUV_on(sv);
af359546 2090 }
28e5dec8 2091#else /* NV_PRESERVES_UV */
c2988b20
NC
2092 if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT))
2093 == (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT)) {
af359546 2094 /* The IV/UV slot will have been set from value returned by
c2988b20
NC
2095 grok_number above. The NV slot has just been set using
2096 Atof. */
560b0c46 2097 SvNOK_on(sv);
c2988b20
NC
2098 assert (SvIOKp(sv));
2099 } else {
2100 if (((UV)1 << NV_PRESERVES_UV_BITS) >
2101 U_V(SvNVX(sv) > 0 ? SvNVX(sv) : -SvNVX(sv))) {
2102 /* Small enough to preserve all bits. */
2103 (void)SvIOKp_on(sv);
2104 SvNOK_on(sv);
45977657 2105 SvIV_set(sv, I_V(SvNVX(sv)));
c2988b20
NC
2106 if ((NV)(SvIVX(sv)) == SvNVX(sv))
2107 SvIOK_on(sv);
2108 /* Assumption: first non-preserved integer is < IV_MAX,
2109 this NV is in the preserved range, therefore: */
2110 if (!(U_V(SvNVX(sv) > 0 ? SvNVX(sv) : -SvNVX(sv))
2111 < (UV)IV_MAX)) {
32fdb065 2112 Perl_croak(aTHX_ "sv_2iv assumed (U_V(fabs((double)SvNVX(sv))) < (UV)IV_MAX) but SvNVX(sv)=%"NVgf" U_V is 0x%"UVxf", IV_MAX is 0x%"UVxf"\n", SvNVX(sv), U_V(SvNVX(sv)), (UV)IV_MAX);
c2988b20
NC
2113 }
2114 } else {
2115 /* IN_UV NOT_INT
2116 0 0 already failed to read UV.
2117 0 1 already failed to read UV.
2118 1 0 you won't get here in this case. IV/UV
2119 slot set, public IOK, Atof() unneeded.
2120 1 1 already read UV.
2121 so there's no point in sv_2iuv_non_preserve() attempting
2122 to use atol, strtol, strtoul etc. */
40a17c4c 2123 sv_2iuv_non_preserve (sv, numtype);
c2988b20
NC
2124 }
2125 }
28e5dec8 2126#endif /* NV_PRESERVES_UV */
25da4f38 2127 }
af359546
NC
2128 }
2129 else {
675c862f 2130 if (isGV_with_GP(sv))
a0933d07 2131 return glob_2number((GV *)sv);
180488f8 2132
af359546
NC
2133 if (!(SvFLAGS(sv) & SVs_PADTMP)) {
2134 if (!PL_localizing && ckWARN(WARN_UNINITIALIZED))
2135 report_uninit(sv);
2136 }
25da4f38
IZ
2137 if (SvTYPE(sv) < SVt_IV)
2138 /* Typically the caller expects that sv_any is not NULL now. */
2139 sv_upgrade(sv, SVt_IV);
af359546
NC
2140 /* Return 0 from the caller. */
2141 return TRUE;
2142 }
2143 return FALSE;
2144}
2145
2146/*
2147=for apidoc sv_2iv_flags
2148
2149Return the integer value of an SV, doing any necessary string
2150conversion. If flags includes SV_GMAGIC, does an mg_get() first.
2151Normally used via the C<SvIV(sv)> and C<SvIVx(sv)> macros.
2152
2153=cut
2154*/
2155
2156IV
2157Perl_sv_2iv_flags(pTHX_ register SV *sv, I32 flags)
2158{
97aff369 2159 dVAR;
af359546 2160 if (!sv)
a0d0e21e 2161 return 0;
af359546
NC
2162 if (SvGMAGICAL(sv)) {
2163 if (flags & SV_GMAGIC)
2164 mg_get(sv);
2165 if (SvIOKp(sv))
2166 return SvIVX(sv);
2167 if (SvNOKp(sv)) {
2168 return I_V(SvNVX(sv));
2169 }
71c558c3
NC
2170 if (SvPOKp(sv) && SvLEN(sv)) {
2171 UV value;
2172 const int numtype
2173 = grok_number(SvPVX_const(sv), SvCUR(sv), &value);
2174
2175 if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT))
2176 == IS_NUMBER_IN_UV) {
2177 /* It's definitely an integer */
2178 if (numtype & IS_NUMBER_NEG) {
2179 if (value < (UV)IV_MIN)
2180 return -(IV)value;
2181 } else {
2182 if (value < (UV)IV_MAX)
2183 return (IV)value;
2184 }
2185 }
2186 if (!numtype) {
2187 if (ckWARN(WARN_NUMERIC))
2188 not_a_number(sv);
2189 }
2190 return I_V(Atof(SvPVX_const(sv)));
2191 }
1c7ff15e
NC
2192 if (SvROK(sv)) {
2193 goto return_rok;
af359546 2194 }
1c7ff15e
NC
2195 assert(SvTYPE(sv) >= SVt_PVMG);
2196 /* This falls through to the report_uninit inside S_sv_2iuv_common. */
4cb1ec55 2197 } else if (SvTHINKFIRST(sv)) {
af359546 2198 if (SvROK(sv)) {
1c7ff15e 2199 return_rok:
af359546
NC
2200 if (SvAMAGIC(sv)) {
2201 SV * const tmpstr=AMG_CALLun(sv,numer);
2202 if (tmpstr && (!SvROK(tmpstr) || (SvRV(tmpstr) != SvRV(sv)))) {
2203 return SvIV(tmpstr);
2204 }
2205 }
2206 return PTR2IV(SvRV(sv));
2207 }
2208 if (SvIsCOW(sv)) {
2209 sv_force_normal_flags(sv, 0);
2210 }
2211 if (SvREADONLY(sv) && !SvOK(sv)) {
2212 if (ckWARN(WARN_UNINITIALIZED))
2213 report_uninit(sv);
2214 return 0;
2215 }
2216 }
2217 if (!SvIOKp(sv)) {
2218 if (S_sv_2iuv_common(aTHX_ sv))
2219 return 0;
79072805 2220 }
1d7c1841
GS
2221 DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2iv(%"IVdf")\n",
2222 PTR2UV(sv),SvIVX(sv)));
25da4f38 2223 return SvIsUV(sv) ? (IV)SvUVX(sv) : SvIVX(sv);
79072805
LW
2224}
2225
645c22ef 2226/*
891f9566 2227=for apidoc sv_2uv_flags
645c22ef
DM
2228
2229Return the unsigned integer value of an SV, doing any necessary string
891f9566
YST
2230conversion. If flags includes SV_GMAGIC, does an mg_get() first.
2231Normally used via the C<SvUV(sv)> and C<SvUVx(sv)> macros.
645c22ef
DM
2232
2233=cut
2234*/
2235
ff68c719 2236UV
891f9566 2237Perl_sv_2uv_flags(pTHX_ register SV *sv, I32 flags)
ff68c719 2238{
97aff369 2239 dVAR;
ff68c719
PP
2240 if (!sv)
2241 return 0;
2242 if (SvGMAGICAL(sv)) {
891f9566
YST
2243 if (flags & SV_GMAGIC)
2244 mg_get(sv);
ff68c719
PP
2245 if (SvIOKp(sv))
2246 return SvUVX(sv);
2247 if (SvNOKp(sv))
2248 return U_V(SvNVX(sv));
71c558c3
NC
2249 if (SvPOKp(sv) && SvLEN(sv)) {
2250 UV value;
2251 const int numtype
2252 = grok_number(SvPVX_const(sv), SvCUR(sv), &value);
2253
2254 if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT))
2255 == IS_NUMBER_IN_UV) {
2256 /* It's definitely an integer */
2257 if (!(numtype & IS_NUMBER_NEG))
2258 return value;
2259 }
2260 if (!numtype) {
2261 if (ckWARN(WARN_NUMERIC))
2262 not_a_number(sv);
2263 }
2264 return U_V(Atof(SvPVX_const(sv)));
2265 }
1c7ff15e
NC
2266 if (SvROK(sv)) {
2267 goto return_rok;
3fe9a6f1 2268 }
1c7ff15e
NC
2269 assert(SvTYPE(sv) >= SVt_PVMG);
2270 /* This falls through to the report_uninit inside S_sv_2iuv_common. */
4cb1ec55 2271 } else if (SvTHINKFIRST(sv)) {
ff68c719 2272 if (SvROK(sv)) {
1c7ff15e 2273 return_rok:
deb46114
NC
2274 if (SvAMAGIC(sv)) {
2275 SV *const tmpstr = AMG_CALLun(sv,numer);
2276 if (tmpstr && (!SvROK(tmpstr) || (SvRV(tmpstr) != SvRV(sv)))) {
2277 return SvUV(tmpstr);
2278 }
2279 }
2280 return PTR2UV(SvRV(sv));
ff68c719 2281 }
765f542d
NC
2282 if (SvIsCOW(sv)) {
2283 sv_force_normal_flags(sv, 0);
8a818333 2284 }
0336b60e 2285 if (SvREADONLY(sv) && !SvOK(sv)) {
0336b60e 2286 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 2287 report_uninit(sv);
ff68c719
PP
2288 return 0;
2289 }
2290 }
af359546
NC
2291 if (!SvIOKp(sv)) {
2292 if (S_sv_2iuv_common(aTHX_ sv))
2293 return 0;
ff68c719 2294 }
25da4f38 2295
1d7c1841
GS
2296 DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2uv(%"UVuf")\n",
2297 PTR2UV(sv),SvUVX(sv)));
25da4f38 2298 return SvIsUV(sv) ? SvUVX(sv) : (UV)SvIVX(sv);
ff68c719
PP
2299}
2300
645c22ef
DM
2301/*
2302=for apidoc sv_2nv
2303
2304Return the num value of an SV, doing any necessary string or integer
2305conversion, magic etc. Normally used via the C<SvNV(sv)> and C<SvNVx(sv)>
2306macros.
2307
2308=cut
2309*/
2310
65202027 2311NV
864dbfa3 2312Perl_sv_2nv(pTHX_ register SV *sv)
79072805 2313{
97aff369 2314 dVAR;
79072805
LW
2315 if (!sv)
2316 return 0.0;
8990e307 2317 if (SvGMAGICAL(sv)) {
463ee0b2
LW
2318 mg_get(sv);
2319 if (SvNOKp(sv))
2320 return SvNVX(sv);
0aa395f8 2321 if ((SvPOKp(sv) && SvLEN(sv)) && !SvIOKp(sv)) {
041457d9 2322 if (!SvIOKp(sv) && ckWARN(WARN_NUMERIC) &&
504618e9 2323 !grok_number(SvPVX_const(sv), SvCUR(sv), NULL))
a0d0e21e 2324 not_a_number(sv);
3f7c398e 2325 return Atof(SvPVX_const(sv));
a0d0e21e 2326 }
25da4f38 2327 if (SvIOKp(sv)) {
1c846c1f 2328 if (SvIsUV(sv))
65202027 2329 return (NV)SvUVX(sv);
25da4f38 2330 else
65202027 2331 return (NV)SvIVX(sv);
47a72cb8
NC
2332 }
2333 if (SvROK(sv)) {
2334 goto return_rok;
2335 }
2336 assert(SvTYPE(sv) >= SVt_PVMG);
2337 /* This falls through to the report_uninit near the end of the
2338 function. */
2339 } else if (SvTHINKFIRST(sv)) {
a0d0e21e 2340 if (SvROK(sv)) {
47a72cb8 2341 return_rok:
deb46114
NC
2342 if (SvAMAGIC(sv)) {
2343 SV *const tmpstr = AMG_CALLun(sv,numer);
2344 if (tmpstr && (!SvROK(tmpstr) || (SvRV(tmpstr) != SvRV(sv)))) {
2345 return SvNV(tmpstr);
2346 }
2347 }
2348 return PTR2NV(SvRV(sv));
a0d0e21e 2349 }
765f542d
NC
2350 if (SvIsCOW(sv)) {
2351 sv_force_normal_flags(sv, 0);
8a818333 2352 }
0336b60e 2353 if (SvREADONLY(sv) && !SvOK(sv)) {
599cee73 2354 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 2355 report_uninit(sv);
ed6116ce
LW
2356 return 0.0;
2357 }
79072805
LW
2358 }
2359 if (SvTYPE(sv) < SVt_NV) {
7e25a7e9
NC
2360 /* The logic to use SVt_PVNV if necessary is in sv_upgrade. */
2361 sv_upgrade(sv, SVt_NV);
906f284f 2362#ifdef USE_LONG_DOUBLE
097ee67d 2363 DEBUG_c({
f93f4e46 2364 STORE_NUMERIC_LOCAL_SET_STANDARD();
1d7c1841
GS
2365 PerlIO_printf(Perl_debug_log,
2366 "0x%"UVxf" num(%" PERL_PRIgldbl ")\n",
2367 PTR2UV(sv), SvNVX(sv));
572bbb43
GS
2368 RESTORE_NUMERIC_LOCAL();
2369 });
65202027 2370#else
572bbb43 2371 DEBUG_c({
f93f4e46 2372 STORE_NUMERIC_LOCAL_SET_STANDARD();
1779d84d 2373 PerlIO_printf(Perl_debug_log, "0x%"UVxf" num(%"NVgf")\n",
1d7c1841 2374 PTR2UV(sv), SvNVX(sv));
097ee67d
JH
2375 RESTORE_NUMERIC_LOCAL();
2376 });
572bbb43 2377#endif
79072805
LW
2378 }
2379 else if (SvTYPE(sv) < SVt_PVNV)
2380 sv_upgrade(sv, SVt_PVNV);
59d8ce62
NC
2381 if (SvNOKp(sv)) {
2382 return SvNVX(sv);
61604483 2383 }
59d8ce62 2384 if (SvIOKp(sv)) {
9d6ce603 2385 SvNV_set(sv, SvIsUV(sv) ? (NV)SvUVX(sv) : (NV)SvIVX(sv));
28e5dec8
JH
2386#ifdef NV_PRESERVES_UV
2387 SvNOK_on(sv);
2388#else
2389 /* Only set the public NV OK flag if this NV preserves the IV */
2390 /* Check it's not 0xFFFFFFFFFFFFFFFF */
2391 if (SvIsUV(sv) ? ((SvUVX(sv) != UV_MAX)&&(SvUVX(sv) == U_V(SvNVX(sv))))
2392 : (SvIVX(sv) == I_V(SvNVX(sv))))
2393 SvNOK_on(sv);
2394 else
2395 SvNOKp_on(sv);
2396#endif
93a17b20 2397 }
748a9306 2398 else if (SvPOKp(sv) && SvLEN(sv)) {
c2988b20 2399 UV value;
3f7c398e 2400 const int numtype = grok_number(SvPVX_const(sv), SvCUR(sv), &value);
041457d9 2401 if (!SvIOKp(sv) && !numtype && ckWARN(WARN_NUMERIC))
a0d0e21e 2402 not_a_number(sv);
28e5dec8 2403#ifdef NV_PRESERVES_UV
c2988b20
NC
2404 if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT))
2405 == IS_NUMBER_IN_UV) {
5e045b90 2406 /* It's definitely an integer */
9d6ce603 2407 SvNV_set(sv, (numtype & IS_NUMBER_NEG) ? -(NV)value : (NV)value);
c2988b20 2408 } else
3f7c398e 2409 SvNV_set(sv, Atof(SvPVX_const(sv)));
28e5dec8
JH
2410 SvNOK_on(sv);
2411#else
3f7c398e 2412 SvNV_set(sv, Atof(SvPVX_const(sv)));
28e5dec8
JH
2413 /* Only set the public NV OK flag if this NV preserves the value in
2414 the PV at least as well as an IV/UV would.
2415 Not sure how to do this 100% reliably. */
2416 /* if that shift count is out of range then Configure's test is
2417 wonky. We shouldn't be in here with NV_PRESERVES_UV_BITS ==
2418 UV_BITS */
2419 if (((UV)1 << NV_PRESERVES_UV_BITS) >
c2988b20 2420 U_V(SvNVX(sv) > 0 ? SvNVX(sv) : -SvNVX(sv))) {
28e5dec8 2421 SvNOK_on(sv); /* Definitely small enough to preserve all bits */
c2988b20
NC
2422 } else if (!(numtype & IS_NUMBER_IN_UV)) {
2423 /* Can't use strtol etc to convert this string, so don't try.
2424 sv_2iv and sv_2uv will use the NV to convert, not the PV. */
2425 SvNOK_on(sv);
2426 } else {
2427 /* value has been set. It may not be precise. */
2428 if ((numtype & IS_NUMBER_NEG) && (value > (UV)IV_MIN)) {
2429 /* 2s complement assumption for (UV)IV_MIN */
2430 SvNOK_on(sv); /* Integer is too negative. */
2431 } else {
2432 SvNOKp_on(sv);
2433 SvIOKp_on(sv);
6fa402ec 2434
c2988b20 2435 if (numtype & IS_NUMBER_NEG) {
45977657 2436 SvIV_set(sv, -(IV)value);
c2988b20 2437 } else if (value <= (UV)IV_MAX) {
45977657 2438 SvIV_set(sv, (IV)value);
c2988b20 2439 } else {
607fa7f2 2440 SvUV_set(sv, value);
c2988b20
NC
2441 SvIsUV_on(sv);
2442 }
2443
2444 if (numtype & IS_NUMBER_NOT_INT) {
2445 /* I believe that even if the original PV had decimals,
2446 they are lost beyond the limit of the FP precision.
2447 However, neither is canonical, so both only get p
2448 flags. NWC, 2000/11/25 */
2449 /* Both already have p flags, so do nothing */
2450 } else {
66a1b24b 2451 const NV nv = SvNVX(sv);
c2988b20
NC
2452 if (SvNVX(sv) < (NV)IV_MAX + 0.5) {
2453 if (SvIVX(sv) == I_V(nv)) {
2454 SvNOK_on(sv);
c2988b20 2455 } else {
c2988b20
NC
2456 /* It had no "." so it must be integer. */
2457 }
00b6aa41 2458 SvIOK_on(sv);
c2988b20
NC
2459 } else {
2460 /* between IV_MAX and NV(UV_MAX).
2461 Could be slightly > UV_MAX */
6fa402ec 2462
c2988b20
NC
2463 if (numtype & IS_NUMBER_NOT_INT) {
2464 /* UV and NV both imprecise. */
2465 } else {
66a1b24b 2466 const UV nv_as_uv = U_V(nv);
c2988b20
NC
2467
2468 if (value == nv_as_uv && SvUVX(sv) != UV_MAX) {
2469 SvNOK_on(sv);
c2988b20 2470 }
00b6aa41 2471 SvIOK_on(sv);
c2988b20
NC
2472 }
2473 }
2474 }
2475 }
2476 }
28e5dec8 2477#endif /* NV_PRESERVES_UV */
93a17b20 2478 }
79072805 2479 else {
f7877b28 2480 if (isGV_with_GP(sv)) {
19f6321d 2481 glob_2number((GV *)sv);
180488f8
NC
2482 return 0.0;
2483 }
2484
041457d9 2485 if (!PL_localizing && !(SvFLAGS(sv) & SVs_PADTMP) && ckWARN(WARN_UNINITIALIZED))
29489e7c 2486 report_uninit(sv);
7e25a7e9
NC
2487 assert (SvTYPE(sv) >= SVt_NV);
2488 /* Typically the caller expects that sv_any is not NULL now. */
2489 /* XXX Ilya implies that this is a bug in callers that assume this
2490 and ideally should be fixed. */
a0d0e21e 2491 return 0.0;
79072805 2492 }
572bbb43 2493#if defined(USE_LONG_DOUBLE)
097ee67d 2494 DEBUG_c({
f93f4e46 2495 STORE_NUMERIC_LOCAL_SET_STANDARD();
1d7c1841
GS
2496 PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2nv(%" PERL_PRIgldbl ")\n",
2497 PTR2UV(sv), SvNVX(sv));
572bbb43
GS
2498 RESTORE_NUMERIC_LOCAL();
2499 });
65202027 2500#else
572bbb43 2501 DEBUG_c({
f93f4e46 2502 STORE_NUMERIC_LOCAL_SET_STANDARD();
1779d84d 2503 PerlIO_printf(Perl_debug_log, "0x%"UVxf" 1nv(%"NVgf")\n",
1d7c1841 2504 PTR2UV(sv), SvNVX(sv));
097ee67d
JH
2505 RESTORE_NUMERIC_LOCAL();
2506 });
572bbb43 2507#endif
463ee0b2 2508 return SvNVX(sv);
79072805
LW
2509}
2510
645c22ef
DM
2511/* uiv_2buf(): private routine for use by sv_2pv_flags(): print an IV or
2512 * UV as a string towards the end of buf, and return pointers to start and
2513 * end of it.
2514 *
2515 * We assume that buf is at least TYPE_CHARS(UV) long.
2516 */
2517
864dbfa3 2518static char *
aec46f14 2519S_uiv_2buf(char *buf, IV iv, UV uv, int is_uv, char **peob)
25da4f38 2520{
25da4f38 2521 char *ptr = buf + TYPE_CHARS(UV);
823a54a3 2522 char * const ebuf = ptr;
25da4f38 2523 int sign;
25da4f38
IZ
2524
2525 if (is_uv)
2526 sign = 0;
2527 else if (iv >= 0) {
2528 uv = iv;
2529 sign = 0;
2530 } else {
2531 uv = -iv;
2532 sign = 1;
2533 }
2534 do {
eb160463 2535 *--ptr = '0' + (char)(uv % 10);
25da4f38
IZ
2536 } while (uv /= 10);
2537 if (sign)
2538 *--ptr = '-';
2539 *peob = ebuf;
2540 return ptr;
2541}
2542
645c22ef
DM
2543/*
2544=for apidoc sv_2pv_flags
2545
ff276b08 2546Returns a pointer to the string value of an SV, and sets *lp to its length.
645c22ef
DM
2547If flags includes SV_GMAGIC, does an mg_get() first. Coerces sv to a string
2548if necessary.
2549Normally invoked via the C<SvPV_flags> macro. C<sv_2pv()> and C<sv_2pv_nomg>
2550usually end up here too.
2551
2552=cut
2553*/
2554
8d6d96c1
HS
2555char *
2556Perl_sv_2pv_flags(pTHX_ register SV *sv, STRLEN *lp, I32 flags)
2557{
97aff369 2558 dVAR;
79072805 2559 register char *s;
79072805 2560
463ee0b2 2561 if (!sv) {
cdb061a3
NC
2562 if (lp)
2563 *lp = 0;
73d840c0 2564 return (char *)"";
463ee0b2 2565 }
8990e307 2566 if (SvGMAGICAL(sv)) {
8d6d96c1
HS
2567 if (flags & SV_GMAGIC)
2568 mg_get(sv);
463ee0b2 2569 if (SvPOKp(sv)) {
cdb061a3
NC
2570 if (lp)
2571 *lp = SvCUR(sv);
10516c54
NC
2572 if (flags & SV_MUTABLE_RETURN)
2573 return SvPVX_mutable(sv);
4d84ee25
NC
2574 if (flags & SV_CONST_RETURN)
2575 return (char *)SvPVX_const(sv);
463ee0b2
LW
2576 return SvPVX(sv);
2577 }
75dfc8ec
NC
2578 if (SvIOKp(sv) || SvNOKp(sv)) {
2579 char tbuf[64]; /* Must fit sprintf/Gconvert of longest IV/NV */
75dfc8ec
NC
2580 STRLEN len;
2581
2582 if (SvIOKp(sv)) {
e80fed9d 2583 len = SvIsUV(sv)
d9fad198
JH
2584 ? my_snprintf(tbuf, sizeof(tbuf), "%"UVuf, (UV)SvUVX(sv))
2585 : my_snprintf(tbuf, sizeof(tbuf), "%"IVdf, (IV)SvIVX(sv));
75dfc8ec 2586 } else {
e8ada2d0
NC
2587 Gconvert(SvNVX(sv), NV_DIG, 0, tbuf);
2588 len = strlen(tbuf);
75dfc8ec 2589 }
b5b886f0
NC
2590 assert(!SvROK(sv));
2591 {
75dfc8ec
NC
2592 dVAR;
2593
2594#ifdef FIXNEGATIVEZERO
e8ada2d0
NC
2595 if (len == 2 && tbuf[0] == '-' && tbuf[1] == '0') {
2596 tbuf[0] = '0';
2597 tbuf[1] = 0;
75dfc8ec
NC
2598 len = 1;
2599 }
2600#endif
2601 SvUPGRADE(sv, SVt_PV);
2602 if (lp)
2603 *lp = len;
2604 s = SvGROW_mutable(sv, len + 1);
2605 SvCUR_set(sv, len);
2606 SvPOKp_on(sv);
10edeb5d 2607 return (char*)memcpy(s, tbuf, len + 1);
75dfc8ec 2608 }
463ee0b2 2609 }
1c7ff15e
NC
2610 if (SvROK(sv)) {
2611 goto return_rok;
2612 }
2613 assert(SvTYPE(sv) >= SVt_PVMG);
2614 /* This falls through to the report_uninit near the end of the
2615 function. */
2616 } else if (SvTHINKFIRST(sv)) {
ed6116ce 2617 if (SvROK(sv)) {
1c7ff15e 2618 return_rok:
deb46114
NC
2619 if (SvAMAGIC(sv)) {
2620 SV *const tmpstr = AMG_CALLun(sv,string);
2621 if (tmpstr && (!SvROK(tmpstr) || (SvRV(tmpstr) != SvRV(sv)))) {
2622 /* Unwrap this: */
2623 /* char *pv = lp ? SvPV(tmpstr, *lp) : SvPV_nolen(tmpstr);
2624 */
2625
2626 char *pv;
2627 if ((SvFLAGS(tmpstr) & (SVf_POK)) == SVf_POK) {
2628 if (flags & SV_CONST_RETURN) {
2629 pv = (char *) SvPVX_const(tmpstr);
2630 } else {
2631 pv = (flags & SV_MUTABLE_RETURN)
2632 ? SvPVX_mutable(tmpstr) : SvPVX(tmpstr);
2633 }
2634 if (lp)
2635 *lp = SvCUR(tmpstr);
50adf7d2 2636 } else {
deb46114 2637 pv = sv_2pv_flags(tmpstr, lp, flags);
50adf7d2 2638 }
deb46114
NC
2639 if (SvUTF8(tmpstr))
2640 SvUTF8_on(sv);
2641 else
2642 SvUTF8_off(sv);
2643 return pv;
50adf7d2 2644 }
deb46114
NC
2645 }
2646 {
fafee734
NC
2647 STRLEN len;
2648 char *retval;
2649 char *buffer;
f9277f47 2650 MAGIC *mg;
d8eae41e
NC
2651 const SV *const referent = (SV*)SvRV(sv);
2652
2653 if (!referent) {
fafee734
NC
2654 len = 7;
2655 retval = buffer = savepvn("NULLREF", len);
042dae7a
NC
2656 } else if (SvTYPE(referent) == SVt_PVMG
2657 && ((SvFLAGS(referent) &
2658 (SVs_OBJECT|SVf_OK|SVs_GMG|SVs_SMG|SVs_RMG))
2659 == (SVs_OBJECT|SVs_SMG))
de8c5301
YO
2660 && (mg = mg_find(referent, PERL_MAGIC_qr)))
2661 {
2662 char *str = NULL;
2663 I32 haseval = 0;
60df1e07 2664 U32 flags = 0;
de8c5301
YO
2665 (str) = CALLREG_AS_STR(mg,lp,&flags,&haseval);
2666 if (flags & 1)
2667 SvUTF8_on(sv);
2668 else
2669 SvUTF8_off(sv);
2670 PL_reginterp_cnt += haseval;
2671 return str;
d8eae41e
NC
2672 } else {
2673 const char *const typestr = sv_reftype(referent, 0);
fafee734
NC
2674 const STRLEN typelen = strlen(typestr);
2675 UV addr = PTR2UV(referent);
2676 const char *stashname = NULL;
2677 STRLEN stashnamelen = 0; /* hush, gcc */
2678 const char *buffer_end;
d8eae41e 2679
d8eae41e 2680 if (SvOBJECT(referent)) {
fafee734
NC
2681 const HEK *const name = HvNAME_HEK(SvSTASH(referent));
2682
2683 if (name) {
2684 stashname = HEK_KEY(name);
2685 stashnamelen = HEK_LEN(name);
2686
2687 if (HEK_UTF8(name)) {
2688 SvUTF8_on(sv);
2689 } else {
2690 SvUTF8_off(sv);
2691 }
2692 } else {
2693 stashname = "__ANON__";
2694 stashnamelen = 8;
2695 }
2696 len = stashnamelen + 1 /* = */ + typelen + 3 /* (0x */
2697 + 2 * sizeof(UV) + 2 /* )\0 */;
2698 } else {
2699 len = typelen + 3 /* (0x */
2700 + 2 * sizeof(UV) + 2 /* )\0 */;
d8eae41e 2701 }
fafee734
NC
2702
2703 Newx(buffer, len, char);
2704 buffer_end = retval = buffer + len;
2705
2706 /* Working backwards */
2707 *--retval = '\0';
2708 *--retval = ')';
2709 do {
2710 *--retval = PL_hexdigit[addr & 15];
2711 } while (addr >>= 4);
2712 *--retval = 'x';
2713 *--retval = '0';
2714 *--retval = '(';
2715
2716 retval -= typelen;
2717 memcpy(retval, typestr, typelen);
2718
2719 if (stashname) {
2720 *--retval = '=';
2721 retval -= stashnamelen;
2722 memcpy(retval, stashname, stashnamelen);
2723 }
2724 /* retval may not neccesarily have reached the start of the
2725 buffer here. */
2726 assert (retval >= buffer);
2727
2728 len = buffer_end - retval - 1; /* -1 for that \0 */
c080367d 2729 }
042dae7a 2730 if (lp)
fafee734
NC
2731 *lp = len;
2732 SAVEFREEPV(buffer);
2733 return retval;
463ee0b2 2734 }
79072805 2735 }
0336b60e 2736 if (SvREADONLY(sv) && !SvOK(sv)) {
0336b60e 2737 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 2738 report_uninit(sv);
cdb061a3
NC
2739 if (lp)
2740 *lp = 0;
73d840c0 2741 return (char *)"";
79072805 2742 }
79072805 2743 }
28e5dec8
JH
2744 if (SvIOK(sv) || ((SvIOKp(sv) && !SvNOKp(sv)))) {
2745 /* I'm assuming that if both IV and NV are equally valid then
2746 converting the IV is going to be more efficient */
e1ec3a88 2747 const U32 isUIOK = SvIsUV(sv);
28e5dec8
JH
2748 char buf[TYPE_CHARS(UV)];
2749 char *ebuf, *ptr;
2750
2751 if (SvTYPE(sv) < SVt_PVIV)
2752 sv_upgrade(sv, SVt_PVIV);
4ea1d550 2753 ptr = uiv_2buf(buf, SvIVX(sv), SvUVX(sv), isUIOK, &ebuf);
5902b6a9
NC
2754 /* inlined from sv_setpvn */
2755 SvGROW_mutable(sv, (STRLEN)(ebuf - ptr + 1));
4d84ee25 2756 Move(ptr,SvPVX_mutable(sv),ebuf - ptr,char);
28e5dec8
JH
2757 SvCUR_set(sv, ebuf - ptr);
2758 s = SvEND(sv);
2759 *s = '\0';
28e5dec8
JH
2760 }
2761 else if (SvNOKp(sv)) {
c81271c3 2762 const int olderrno = errno;
79072805
LW
2763 if (SvTYPE(sv) < SVt_PVNV)
2764 sv_upgrade(sv, SVt_PVNV);
1c846c1f 2765 /* The +20 is pure guesswork. Configure test needed. --jhi */
5902b6a9 2766 s = SvGROW_mutable(sv, NV_DIG + 20);
c81271c3 2767 /* some Xenix systems wipe out errno here */
79072805 2768#ifdef apollo
463ee0b2 2769 if (SvNVX(sv) == 0.0)
d1307786 2770 my_strlcpy(s, "0", SvLEN(sv));
79072805
LW
2771 else
2772#endif /*apollo*/
bbce6d69 2773 {
2d4389e4 2774 Gconvert(SvNVX(sv), NV_DIG, 0, s);
bbce6d69 2775 }
79072805 2776 errno = olderrno;
a0d0e21e
LW
2777#ifdef FIXNEGATIVEZERO
2778 if (*s == '-' && s[1] == '0' && !s[2])
d1307786 2779 my_strlcpy(s, "0", SvLEN(s));
a0d0e21e 2780#endif
79072805
LW
2781 while (*s) s++;
2782#ifdef hcx
2783 if (s[-1] == '.')
46fc3d4c 2784 *--s = '\0';
79072805
LW
2785#endif
2786 }
79072805 2787 else {
675c862f 2788 if (isGV_with_GP(sv))
19f6321d 2789 return glob_2pv((GV *)sv, lp);
180488f8 2790
041457d9 2791 if (!PL_localizing && !(SvFLAGS(sv) & SVs_PADTMP) && ckWARN(WARN_UNINITIALIZED))
29489e7c 2792 report_uninit(sv);
cdb061a3 2793 if (lp)
00b6aa41 2794 *lp = 0;
25da4f38
IZ
2795 if (SvTYPE(sv) < SVt_PV)
2796 /* Typically the caller expects that sv_any is not NULL now. */
2797 sv_upgrade(sv, SVt_PV);
73d840c0 2798 return (char *)"";
79072805 2799 }
cdb061a3 2800 {
823a54a3 2801 const STRLEN len = s - SvPVX_const(sv);
cdb061a3
NC
2802 if (lp)
2803 *lp = len;
2804 SvCUR_set(sv, len);
2805 }
79072805 2806 SvPOK_on(sv);
1d7c1841 2807 DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2pv(%s)\n",
3f7c398e 2808 PTR2UV(sv),SvPVX_const(sv)));
4d84ee25
NC
2809 if (flags & SV_CONST_RETURN)
2810 return (char *)SvPVX_const(sv);
10516c54
NC
2811 if (flags & SV_MUTABLE_RETURN)
2812 return SvPVX_mutable(sv);
463ee0b2
LW
2813 return SvPVX(sv);
2814}
2815
645c22ef 2816/*
6050d10e
JP
2817=for apidoc sv_copypv
2818
2819Copies a stringified representation of the source SV into the
2820destination SV. Automatically performs any necessary mg_get and
54f0641b 2821coercion of numeric values into strings. Guaranteed to preserve
6050d10e 2822UTF-8 flag even from overloaded objects. Similar in nature to
54f0641b
NIS
2823sv_2pv[_flags] but operates directly on an SV instead of just the
2824string. Mostly uses sv_2pv_flags to do its work, except when that
6050d10e
JP
2825would lose the UTF-8'ness of the PV.
2826
2827=cut
2828*/
2829
2830void
2831Perl_sv_copypv(pTHX_ SV *dsv, register SV *ssv)
2832{
446eaa42 2833 STRLEN len;
53c1dcc0 2834 const char * const s = SvPV_const(ssv,len);
cb50f42d 2835 sv_setpvn(dsv,s,len);
446eaa42 2836 if (SvUTF8(ssv))
cb50f42d 2837 SvUTF8_on(dsv);
446eaa42 2838 else
cb50f42d 2839 SvUTF8_off(dsv);
6050d10e
JP
2840}
2841
2842/*
645c22ef
DM
2843=for apidoc sv_2pvbyte
2844
2845Return a pointer to the byte-encoded representation of the SV, and set *lp
1e54db1a 2846to its length. May cause the SV to be downgraded from UTF-8 as a
645c22ef
DM
2847side-effect.
2848
2849Usually accessed via the C<SvPVbyte> macro.
2850
2851=cut
2852*/
2853
7340a771
GS
2854char *
2855Perl_sv_2pvbyte(pTHX_ register SV *sv, STRLEN *lp)
2856{
0875d2fe 2857 sv_utf8_downgrade(sv,0);
97972285 2858 return lp ? SvPV(sv,*lp) : SvPV_nolen(sv);
7340a771
GS
2859}
2860
645c22ef 2861/*
035cbb0e
RGS
2862=for apidoc sv_2pvutf8
2863
2864Return a pointer to the UTF-8-encoded representation of the SV, and set *lp
2865to its length. May cause the SV to be upgraded to UTF-8 as a side-effect.
2866
2867Usually accessed via the C<SvPVutf8> macro.
2868
2869=cut
2870*/
645c22ef 2871
7340a771
GS
2872char *
2873Perl_sv_2pvutf8(pTHX_ register SV *sv, STRLEN *lp)
2874{
035cbb0e
RGS
2875 sv_utf8_upgrade(sv);
2876 return lp ? SvPV(sv,*lp) : SvPV_nolen(sv);
7340a771 2877}
1c846c1f 2878
7ee2227d 2879
645c22ef
DM
2880/*
2881=for apidoc sv_2bool
2882
2883This function is only called on magical items, and is only used by
8cf8f3d1 2884sv_true() or its macro equivalent.
645c22ef
DM
2885
2886=cut
2887*/
2888
463ee0b2 2889bool
864dbfa3 2890Perl_sv_2bool(pTHX_ register SV *sv)
463ee0b2 2891{
97aff369 2892 dVAR;
5b295bef 2893 SvGETMAGIC(sv);
463ee0b2 2894
a0d0e21e
LW
2895 if (!SvOK(sv))
2896 return 0;
2897 if (SvROK(sv)) {
fabdb6c0
AL
2898 if (SvAMAGIC(sv)) {
2899 SV * const tmpsv = AMG_CALLun(sv,bool_);
2900 if (tmpsv && (!SvROK(tmpsv) || (SvRV(tmpsv) != SvRV(sv))))
2901 return (bool)SvTRUE(tmpsv);
2902 }
2903 return SvRV(sv) != 0;
a0d0e21e 2904 }
463ee0b2 2905 if (SvPOKp(sv)) {
53c1dcc0
AL
2906 register XPV* const Xpvtmp = (XPV*)SvANY(sv);
2907 if (Xpvtmp &&
339049b0 2908 (*sv->sv_u.svu_pv > '0' ||
11343788 2909 Xpvtmp->xpv_cur > 1 ||
339049b0 2910 (Xpvtmp->xpv_cur && *sv->sv_u.svu_pv != '0')))
463ee0b2
LW
2911 return 1;
2912 else
2913 return 0;
2914 }
2915 else {
2916 if (SvIOKp(sv))
2917 return SvIVX(sv) != 0;
2918 else {
2919 if (SvNOKp(sv))
2920 return SvNVX(sv) != 0.0;
180488f8 2921 else {
f7877b28 2922 if (isGV_with_GP(sv))
180488f8
NC
2923 return TRUE;
2924 else
2925 return FALSE;
2926 }
463ee0b2
LW
2927 }
2928 }
79072805
LW
2929}
2930
c461cf8f
JH
2931/*
2932=for apidoc sv_utf8_upgrade
2933
78ea37eb 2934Converts the PV of an SV to its UTF-8-encoded form.
645c22ef 2935Forces the SV to string form if it is not already.
4411f3b6
NIS
2936Always sets the SvUTF8 flag to avoid future validity checks even
2937if all the bytes have hibit clear.
c461cf8f 2938
13a6c0e0
JH
2939This is not as a general purpose byte encoding to Unicode interface:
2940use the Encode extension for that.
2941
8d6d96c1
HS
2942=for apidoc sv_utf8_upgrade_flags
2943
78ea37eb 2944Converts the PV of an SV to its UTF-8-encoded form.
645c22ef 2945Forces the SV to string form if it is not already.
8d6d96c1
HS
2946Always sets the SvUTF8 flag to avoid future validity checks even
2947if all the bytes have hibit clear. If C<flags> has C<SV_GMAGIC> bit set,
2948will C<mg_get> on C<sv> if appropriate, else not. C<sv_utf8_upgrade> and
2949C<sv_utf8_upgrade_nomg> are implemented in terms of this function.
2950
13a6c0e0
JH
2951This is not as a general purpose byte encoding to Unicode interface:
2952use the Encode extension for that.
2953
8d6d96c1
HS
2954=cut
2955*/
2956
2957STRLEN
2958Perl_sv_utf8_upgrade_flags(pTHX_ register SV *sv, I32 flags)
2959{
97aff369 2960 dVAR;
808c356f
RGS
2961 if (sv == &PL_sv_undef)
2962 return 0;
e0e62c2a
NIS
2963 if (!SvPOK(sv)) {
2964 STRLEN len = 0;
d52b7888
NC
2965 if (SvREADONLY(sv) && (SvPOKp(sv) || SvIOKp(sv) || SvNOKp(sv))) {
2966 (void) sv_2pv_flags(sv,&len, flags);
2967 if (SvUTF8(sv))
2968 return len;
2969 } else {
2970 (void) SvPV_force(sv,len);
2971 }
e0e62c2a 2972 }
4411f3b6 2973
f5cee72b 2974 if (SvUTF8(sv)) {
5fec3b1d 2975 return SvCUR(sv);
f5cee72b 2976 }
5fec3b1d 2977
765f542d
NC
2978 if (SvIsCOW(sv)) {
2979 sv_force_normal_flags(sv, 0);
db42d148
NIS
2980 }
2981
88632417 2982 if (PL_encoding && !(flags & SV_UTF8_NO_ENCODING))
799ef3cb 2983 sv_recode_to_utf8(sv, PL_encoding);
9f4817db 2984 else { /* Assume Latin-1/EBCDIC */
c4e7c712
NC
2985 /* This function could be much more efficient if we
2986 * had a FLAG in SVs to signal if there are any hibit
2987 * chars in the PV. Given that there isn't such a flag
2988 * make the loop as fast as possible. */
00b6aa41 2989 const U8 * const s = (U8 *) SvPVX_const(sv);
c4420975 2990 const U8 * const e = (U8 *) SvEND(sv);
93524f2b 2991 const U8 *t = s;
c4e7c712
NC
2992
2993 while (t < e) {
53c1dcc0 2994 const U8 ch = *t++;
00b6aa41
AL
2995 /* Check for hi bit */
2996 if (!NATIVE_IS_INVARIANT(ch)) {
2997 STRLEN len = SvCUR(sv) + 1; /* Plus the \0 */
2998 U8 * const recoded = bytes_to_utf8((U8*)s, &len);
2999
3000 SvPV_free(sv); /* No longer using what was there before. */
3001 SvPV_set(sv, (char*)recoded);
3002 SvCUR_set(sv, len - 1);
3003 SvLEN_set(sv, len); /* No longer know the real size. */
c4e7c712 3004 break;
00b6aa41 3005 }
c4e7c712
NC
3006 }
3007 /* Mark as UTF-8 even if no hibit - saves scanning loop */
3008 SvUTF8_on(sv);
560a288e 3009 }
4411f3b6 3010 return SvCUR(sv);
560a288e
GS
3011}
3012
c461cf8f
JH
3013/*
3014=for apidoc sv_utf8_downgrade
3015
78ea37eb
ST
3016Attempts to convert the PV of an SV from characters to bytes.
3017If the PV contains a character beyond byte, this conversion will fail;
3018in this case, either returns false or, if C<fail_ok> is not
c461cf8f
JH
3019true, croaks.
3020
13a6c0e0
JH
3021This is not as a general purpose Unicode to byte encoding interface:
3022use the Encode extension for that.
3023
c461cf8f
JH
3024=cut
3025*/
3026
560a288e
GS
3027bool
3028Perl_sv_utf8_downgrade(pTHX_ register SV* sv, bool fail_ok)
3029{
97aff369 3030 dVAR;
78ea37eb 3031 if (SvPOKp(sv) && SvUTF8(sv)) {
fa301091 3032 if (SvCUR(sv)) {
03cfe0ae 3033 U8 *s;
652088fc 3034 STRLEN len;
fa301091 3035
765f542d
NC
3036 if (SvIsCOW(sv)) {
3037 sv_force_normal_flags(sv, 0);
3038 }
03cfe0ae
NIS
3039 s = (U8 *) SvPV(sv, len);
3040 if (!utf8_to_bytes(s, &len)) {
fa301091
JH
3041 if (fail_ok)
3042 return FALSE;
3043 else {
3044 if (PL_op)
3045 Perl_croak(aTHX_ "Wide character in %s",
53e06cf0 3046 OP_DESC(PL_op));
fa301091
JH
3047 else
3048 Perl_croak(aTHX_ "Wide character");
3049 }
4b3603a4 3050 }
b162af07 3051 SvCUR_set(sv, len);
67e989fb 3052 }
560a288e 3053 }
ffebcc3e 3054 SvUTF8_off(sv);
560a288e
GS
3055 return TRUE;
3056}
3057
c461cf8f
JH
3058/*
3059=for apidoc sv_utf8_encode
3060
78ea37eb
ST
3061Converts the PV of an SV to UTF-8, but then turns the C<SvUTF8>
3062flag off so that it looks like octets again.
c461cf8f
JH
3063
3064=cut
3065*/
3066
560a288e
GS
3067void
3068Perl_sv_utf8_encode(pTHX_ register SV *sv)
3069{
4c94c214
NC
3070 if (SvIsCOW(sv)) {
3071 sv_force_normal_flags(sv, 0);
3072 }
3073 if (SvREADONLY(sv)) {
3074 Perl_croak(aTHX_ PL_no_modify);
3075 }
a5f5288a 3076 (void) sv_utf8_upgrade(sv);
560a288e
GS
3077 SvUTF8_off(sv);
3078}
3079
4411f3b6
NIS
3080/*
3081=for apidoc sv_utf8_decode
3082
78ea37eb
ST
3083If the PV of the SV is an octet sequence in UTF-8
3084and contains a multiple-byte character, the C<SvUTF8> flag is turned on
3085so that it looks like a character. If the PV contains only single-byte
3086characters, the C<SvUTF8> flag stays being off.
3087Scans PV for validity and returns false if the PV is invalid UTF-8.
4411f3b6
NIS
3088
3089=cut
3090*/
3091
560a288e
GS
3092bool
3093Perl_sv_utf8_decode(pTHX_ register SV *sv)
3094{
78ea37eb 3095 if (SvPOKp(sv)) {
93524f2b
NC
3096 const U8 *c;
3097 const U8 *e;
9cbac4c7 3098
645c22ef
DM
3099 /* The octets may have got themselves encoded - get them back as
3100 * bytes
3101 */
3102 if (!sv_utf8_downgrade(sv, TRUE))
560a288e
GS
3103 return FALSE;
3104
3105 /* it is actually just a matter of turning the utf8 flag on, but
3106 * we want to make sure everything inside is valid utf8 first.
3107 */
93524f2b 3108 c = (const U8 *) SvPVX_const(sv);
63cd0674 3109 if (!is_utf8_string(c, SvCUR(sv)+1))
67e989fb 3110 return FALSE;
93524f2b 3111 e = (const U8 *) SvEND(sv);
511c2ff0 3112 while (c < e) {
b64e5050 3113 const U8 ch = *c++;
c4d5f83a 3114 if (!UTF8_IS_INVARIANT(ch)) {
67e989fb
JH
3115 SvUTF8_on(sv);
3116 break;
3117 }
560a288e 3118 }
560a288e
GS
3119 }
3120 return TRUE;
3121}
3122
954c1994
GS
3123/*
3124=for apidoc sv_setsv
3125
645c22ef
DM
3126Copies the contents of the source SV C<ssv> into the destination SV
3127C<dsv>. The source SV may be destroyed if it is mortal, so don't use this
3128function if the source SV needs to be reused. Does not handle 'set' magic.
3129Loosely speaking, it performs a copy-by-value, obliterating any previous
3130content of the destination.
3131
3132You probably want to use one of the assortment of wrappers, such as
3133C<SvSetSV>, C<SvSetSV_nosteal>, C<SvSetMagicSV> and
3134C<SvSetMagicSV_nosteal>.
3135
8d6d96c1
HS
3136=for apidoc sv_setsv_flags
3137
645c22ef
DM
3138Copies the contents of the source SV C<ssv> into the destination SV
3139C<dsv>. The source SV may be destroyed if it is mortal, so don't use this
3140function if the source SV needs to be reused. Does not handle 'set' magic.
3141Loosely speaking, it performs a copy-by-value, obliterating any previous
3142content of the destination.
3143If the C<flags> parameter has the C<SV_GMAGIC> bit set, will C<mg_get> on
5fcdf167
NC
3144C<ssv> if appropriate, else not. If the C<flags> parameter has the
3145C<NOSTEAL> bit set then the buffers of temps will not be stolen. <sv_setsv>
3146and C<sv_setsv_nomg> are implemented in terms of this function.
645c22ef
DM
3147
3148You probably want to use one of the assortment of wrappers, such as
3149C<SvSetSV>, C<SvSetSV_nosteal>, C<SvSetMagicSV> and
3150C<SvSetMagicSV_nosteal>.
3151
3152This is the primary function for copying scalars, and most other
3153copy-ish functions and macros use this underneath.
8d6d96c1
HS
3154
3155=cut
3156*/
3157
5d0301b7 3158static void
2eb42952 3159S_glob_assign_glob(pTHX_ SV *dstr, SV *sstr, const int dtype)
5d0301b7
NC
3160{
3161 if (dtype != SVt_PVGV) {
3162 const char * const name = GvNAME(sstr);
3163 const STRLEN len = GvNAMELEN(sstr);
3164 /* don't upgrade SVt_PVLV: it can hold a glob */
f7877b28
NC
3165 if (dtype != SVt_PVLV) {
3166 if (dtype >= SVt_PV) {
3167 SvPV_free(dstr);
3168 SvPV_set(dstr, 0);
3169 SvLEN_set(dstr, 0);
3170 SvCUR_set(dstr, 0);
3171 }
5d0301b7 3172 sv_upgrade(dstr, SVt_PVGV);
dedf8e73
NC
3173 (void)SvOK_off(dstr);
3174 SvSCREAM_on(dstr);
f7877b28 3175 }
5d0301b7
NC
3176 GvSTASH(dstr) = GvSTASH(sstr);
3177 if (GvSTASH(dstr))
3178 Perl_sv_add_backref(aTHX_ (SV*)GvSTASH(dstr), dstr);
ae8cc45f 3179 gv_name_set((GV *)dstr, name, len, GV_ADD);
5d0301b7
NC
3180 SvFAKE_on(dstr); /* can coerce to non-glob */
3181 }
3182
3183#ifdef GV_UNIQUE_CHECK
3184 if (GvUNIQUE((GV*)dstr)) {
3185 Perl_croak(aTHX_ PL_no_modify);
3186 }
3187#endif
3188
f7877b28
NC
3189 gp_free((GV*)dstr);
3190 SvSCREAM_off(dstr);
5d0301b7 3191 (void)SvOK_off(dstr);
f7877b28 3192 SvSCREAM_on(dstr);
dedf8e73 3193 GvINTRO_off(dstr); /* one-shot flag */
5d0301b7
NC
3194 GvGP(dstr) = gp_ref(GvGP(sstr));
3195 if (SvTAINTED(sstr))
3196 SvTAINT(dstr);
3197 if (GvIMPORTED(dstr) != GVf_IMPORTED
3198 && CopSTASH_ne(PL_curcop, GvSTASH(dstr)))
3199 {
3200 GvIMPORTED_on(dstr);
3201 }
3202 GvMULTI_on(dstr);
3203 return;
3204}
3205
b8473700 3206static void
2eb42952 3207S_glob_assign_ref(pTHX_ SV *dstr, SV *sstr) {
b8473700
NC
3208 SV * const sref = SvREFCNT_inc(SvRV(sstr));
3209 SV *dref = NULL;
3210 const int intro = GvINTRO(dstr);
2440974c 3211 SV **location;
3386d083 3212 U8 import_flag = 0;
27242d61
NC
3213 const U32 stype = SvTYPE(sref);
3214
b8473700
NC
3215
3216#ifdef GV_UNIQUE_CHECK
3217 if (GvUNIQUE((GV*)dstr)) {
3218 Perl_croak(aTHX_ PL_no_modify);
3219 }
3220#endif
3221
3222 if (intro) {
3223 GvINTRO_off(dstr); /* one-shot flag */
3224 GvLINE(dstr) = CopLINE(PL_curcop);
3225 GvEGV(dstr) = (GV*)dstr;
3226 }
3227 GvMULTI_on(dstr);
27242d61 3228 switch (stype) {
b8473700 3229 case SVt_PVCV:
27242d61
NC
3230 location = (SV **) &GvCV(dstr);
3231 import_flag = GVf_IMPORTED_CV;
3232 goto common;
3233 case SVt_PVHV:
3234 location = (SV **) &GvHV(dstr);
3235 import_flag = GVf_IMPORTED_HV;
3236 goto common;
3237 case SVt_PVAV:
3238 location = (SV **) &GvAV(dstr);
3239 import_flag = GVf_IMPORTED_AV;
3240 goto common;
3241 case SVt_PVIO:
3242 location = (SV **) &GvIOp(dstr);
3243 goto common;
3244 case SVt_PVFM:
3245 location = (SV **) &GvFORM(dstr);
3246 default:
3247 location = &GvSV(dstr);
3248 import_flag = GVf_IMPORTED_SV;
3249 common:
b8473700 3250 if (intro) {
27242d61
NC
3251 if (stype == SVt_PVCV) {
3252 if (GvCVGEN(dstr) && GvCV(dstr) != (CV*)sref) {
3253 SvREFCNT_dec(GvCV(dstr));
3254 GvCV(dstr) = NULL;
3255 GvCVGEN(dstr) = 0; /* Switch off cacheness. */
3256 PL_sub_generation++;
3257 }
b8473700 3258 }
27242d61 3259 SAVEGENERICSV(*location);
b8473700
NC
3260 }
3261 else
27242d61
NC
3262 dref = *location;
3263 if (stype == SVt_PVCV && *location != sref) {
3264 CV* const cv = (CV*)*location;
b8473700
NC
3265 if (cv) {
3266 if (!GvCVGEN((GV*)dstr) &&
3267 (CvROOT(cv) || CvXSUB(cv)))
3268 {
3269 /* Redefining a sub - warning is mandatory if
3270 it was a const and its value changed. */
3271 if (CvCONST(cv) && CvCONST((CV*)sref)
3272 && cv_const_sv(cv) == cv_const_sv((CV*)sref)) {
6f207bd3 3273 NOOP;
b8473700
NC
3274 /* They are 2 constant subroutines generated from
3275 the same constant. This probably means that
3276 they are really the "same" proxy subroutine
3277 instantiated in 2 places. Most likely this is
3278 when a constant is exported twice. Don't warn.
3279 */
3280 }
3281 else if (ckWARN(WARN_REDEFINE)
3282 || (CvCONST(cv)
3283 && (!CvCONST((CV*)sref)
3284 || sv_cmp(cv_const_sv(cv),
3285 cv_const_sv((CV*)sref))))) {
3286 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
10edeb5d
JH
3287 (const char *)
3288 (CvCONST(cv)
3289 ? "Constant subroutine %s::%s redefined"
3290 : "Subroutine %s::%s redefined"),
b8473700
NC
3291 HvNAME_get(GvSTASH((GV*)dstr)),
3292 GvENAME((GV*)dstr));
3293 }
3294 }
3295 if (!intro)
cbf82dd0
NC
3296 cv_ckproto_len(cv, (GV*)dstr,
3297 SvPOK(sref) ? SvPVX_const(sref) : NULL,
3298 SvPOK(sref) ? SvCUR(sref) : 0);
b8473700 3299 }
b8473700
NC
3300 GvCVGEN(dstr) = 0; /* Switch off cacheness. */
3301 GvASSUMECV_on(dstr);
3302 PL_sub_generation++;
3303 }
2440974c 3304 *location = sref;
3386d083
NC
3305 if (import_flag && !(GvFLAGS(dstr) & import_flag)
3306 && CopSTASH_ne(PL_curcop, GvSTASH(dstr))) {
3307 GvFLAGS(dstr) |= import_flag;
b8473700
NC
3308 }
3309 break;
3310 }
b37c2d43 3311 SvREFCNT_dec(dref);
b8473700
NC
3312 if (SvTAINTED(sstr))
3313 SvTAINT(dstr);
3314 return;
3315}
3316
8d6d96c1
HS
3317void
3318Perl_sv_setsv_flags(pTHX_ SV *dstr, register SV *sstr, I32 flags)
3319{
97aff369 3320 dVAR;
8990e307
LW
3321 register U32 sflags;
3322 register int dtype;
42d0e0b7 3323 register svtype stype;
463ee0b2 3324
79072805
LW
3325 if (sstr == dstr)
3326 return;
29f4f0ab
NC
3327
3328 if (SvIS_FREED(dstr)) {
3329 Perl_croak(aTHX_ "panic: attempt to copy value %" SVf
3330 " to a freed scalar %p", sstr, dstr);
3331 }
765f542d 3332 SV_CHECK_THINKFIRST_COW_DROP(dstr);
79072805 3333 if (!sstr)
3280af22 3334 sstr = &PL_sv_undef;
29f4f0ab
NC
3335 if (SvIS_FREED(sstr)) {
3336 Perl_croak(aTHX_ "panic: attempt to copy freed scalar %p to %p", sstr,
3337 dstr);
3338 }
8990e307
LW
3339 stype = SvTYPE(sstr);
3340 dtype = SvTYPE(dstr);
79072805 3341
a0d0e21e 3342 SvAMAGIC_off(dstr);
7a5fa8a2 3343 if ( SvVOK(dstr) )
ece467f9
JP
3344 {
3345 /* need to nuke the magic */
3346 mg_free(dstr);
3347 SvRMAGICAL_off(dstr);
3348 }
9e7bc3e8 3349
463ee0b2 3350 /* There's a lot of redundancy below but we're going for speed here */
79072805 3351
8990e307 3352 switch (stype) {
79072805 3353 case SVt_NULL:
aece5585 3354 undef_sstr:
20408e3c
GS
3355 if (dtype != SVt_PVGV) {
3356 (void)SvOK_off(dstr);
3357 return;
3358 }
3359 break;
463ee0b2 3360 case SVt_IV:
aece5585
GA
3361 if (SvIOK(sstr)) {
3362 switch (dtype) {
3363 case SVt_NULL:
8990e307 3364 sv_upgrade(dstr, SVt_IV);
aece5585
GA
3365 break;
3366 case SVt_NV:
aece5585
GA
3367 case SVt_RV:
3368 case SVt_PV:
a0d0e21e 3369 sv_upgrade(dstr, SVt_PVIV);
aece5585
GA
3370 break;
3371 }
3372 (void)SvIOK_only(dstr);
45977657 3373 SvIV_set(dstr, SvIVX(sstr));
25da4f38
IZ
3374 if (SvIsUV(sstr))
3375 SvIsUV_on(dstr);
37c25af0
NC
3376 /* SvTAINTED can only be true if the SV has taint magic, which in
3377 turn means that the SV type is PVMG (or greater). This is the
3378 case statement for SVt_IV, so this cannot be true (whatever gcov
3379 may say). */
3380 assert(!SvTAINTED(sstr));
aece5585 3381 return;
8990e307 3382 }
aece5585
GA
3383 goto undef_sstr;
3384
463ee0b2 3385 case SVt_NV:
aece5585
GA
3386 if (SvNOK(sstr)) {
3387 switch (dtype) {
3388 case SVt_NULL:
3389 case SVt_IV:
8990e307 3390 sv_upgrade(dstr, SVt_NV);
aece5585
GA
3391 break;
3392 case SVt_RV:
3393 case SVt_PV:
3394 case SVt_PVIV:
a0d0e21e 3395 sv_upgrade(dstr, SVt_PVNV);
aece5585
GA
3396 break;
3397 }
9d6ce603 3398 SvNV_set(dstr, SvNVX(sstr));
aece5585 3399 (void)SvNOK_only(dstr);
37c25af0
NC
3400 /* SvTAINTED can only be true if the SV has taint magic, which in
3401 turn means that the SV type is PVMG (or greater). This is the
3402 case statement for SVt_NV, so this cannot be true (whatever gcov
3403 may say). */
3404 assert(!SvTAINTED(sstr));
aece5585 3405 return;
8990e307 3406 }
aece5585
GA
3407 goto undef_sstr;
3408
ed6116ce 3409 case SVt_RV:
8990e307 3410 if (dtype < SVt_RV)
ed6116ce 3411 sv_upgrade(dstr, SVt_RV);
ed6116ce 3412 break;
fc36a67e 3413 case SVt_PVFM:
f8c7b90f 3414#ifdef PERL_OLD_COPY_ON_WRITE
d89fc664
NC
3415 if ((SvFLAGS(sstr) & CAN_COW_MASK) == CAN_COW_FLAGS) {
3416 if (dtype < SVt_PVIV)
3417 sv_upgrade(dstr, SVt_PVIV);
3418 break;
3419 }
3420 /* Fall through */
3421#endif
3422 case SVt_PV:
8990e307 3423 if (dtype < SVt_PV)
463ee0b2 3424 sv_upgrade(dstr, SVt_PV);
463ee0b2
LW
3425 break;
3426 case SVt_PVIV:
8990e307 3427 if (dtype < SVt_PVIV)
463ee0b2 3428 sv_upgrade(dstr, SVt_PVIV);
463ee0b2
LW
3429 break;
3430 case SVt_PVNV:
8990e307 3431 if (dtype < SVt_PVNV)
463ee0b2 3432 sv_upgrade(dstr, SVt_PVNV);
463ee0b2 3433 break;
489f7bfe 3434 default:
a3b680e6
AL
3435 {
3436 const char * const type = sv_reftype(sstr,0);
533c011a 3437 if (PL_op)
a3b680e6 3438 Perl_croak(aTHX_ "Bizarre copy of %s in %s", type, OP_NAME(PL_op));
4633a7c4 3439 else
a3b680e6
AL
3440 Perl_croak(aTHX_ "Bizarre copy of %s", type);
3441 }
4633a7c4
LW
3442 break;
3443
79072805 3444 case SVt_PVGV:
8990e307 3445 if (dtype <= SVt_PVGV) {
d4c19fe8 3446 glob_assign_glob(dstr, sstr, dtype);
b8c701c1 3447 return;
79072805 3448 }
5f66b61c 3449 /*FALLTHROUGH*/
79072805 3450
489f7bfe
NC
3451 case SVt_PVMG:
3452 case SVt_PVLV:
3453 case SVt_PVBM:
8d6d96c1 3454 if (SvGMAGICAL(sstr) && (flags & SV_GMAGIC)) {
973f89ab 3455 mg_get(sstr);
1d9c78c6 3456 if (SvTYPE(sstr) != stype) {
973f89ab 3457 stype = SvTYPE(sstr);
b8c701c1 3458 if (stype == SVt_PVGV && dtype <= SVt_PVGV) {
d4c19fe8 3459 glob_assign_glob(dstr, sstr, dtype);
b8c701c1
NC
3460 return;
3461 }
973f89ab
CS
3462 }
3463 }
ded42b9f 3464 if (stype == SVt_PVLV)
862a34c6 3465 SvUPGRADE(dstr, SVt_PVNV);
ded42b9f 3466 else
42d0e0b7 3467 SvUPGRADE(dstr, (svtype)stype);
79072805
LW
3468 }
3469
ff920335
NC
3470 /* dstr may have been upgraded. */
3471 dtype = SvTYPE(dstr);
8990e307
LW
3472 sflags = SvFLAGS(sstr);
3473
85324b4d
NC
3474 if (dtype == SVt_PVCV) {
3475 /* Assigning to a subroutine sets the prototype. */
3476 if (SvOK(sstr)) {
3477 STRLEN len;
3478 const char *const ptr = SvPV_const(sstr, len);
3479
3480 SvGROW(dstr, len + 1);
3481 Copy(ptr, SvPVX(dstr), len + 1, char);
3482 SvCUR_set(dstr, len);
fcddd32e 3483 SvPOK_only(dstr);
85324b4d
NC
3484 } else {
3485 SvOK_off(dstr);
3486 }
3487 } else if (sflags & SVf_ROK) {
a9fe210d 3488 if (dtype == SVt_PVGV && SvTYPE(SvRV(sstr)) == SVt_PVGV) {
acaa9288
NC
3489 sstr = SvRV(sstr);
3490 if (sstr == dstr) {
3491 if (GvIMPORTED(dstr) != GVf_IMPORTED
3492 && CopSTASH_ne(PL_curcop, GvSTASH(dstr)))
3493 {
3494 GvIMPORTED_on(dstr);
3495 }
3496 GvMULTI_on(dstr);
3497 return;
3498 }
d4c19fe8 3499 glob_assign_glob(dstr, sstr, dtype);
acaa9288
NC
3500 return;
3501 }
3502
8990e307 3503 if (dtype >= SVt_PV) {
b8c701c1 3504 if (dtype == SVt_PVGV) {
d4c19fe8 3505 glob_assign_ref(dstr, sstr);
b8c701c1
NC
3506 return;
3507 }
3f7c398e 3508 if (SvPVX_const(dstr)) {
8bd4d4c5 3509 SvPV_free(dstr);
b162af07
SP
3510 SvLEN_set(dstr, 0);
3511 SvCUR_set(dstr, 0);
a0d0e21e 3512 }
8990e307 3513 }
a0d0e21e 3514 (void)SvOK_off(dstr);
b162af07 3515 SvRV_set(dstr, SvREFCNT_inc(SvRV(sstr)));
96d4b0ee 3516 SvFLAGS(dstr) |= sflags & SVf_ROK;
dfd48732
NC
3517 assert(!(sflags & SVp_NOK));
3518 assert(!(sflags & SVp_IOK));
3519 assert(!(sflags & SVf_NOK));
3520 assert(!(sflags & SVf_IOK));
ed6116ce 3521 }
c0c44674
NC
3522 else if (dtype == SVt_PVGV) {
3523 if (!(sflags & SVf_OK)) {
3524 if (ckWARN(WARN_MISC))
3525 Perl_warner(aTHX_ packWARN(WARN_MISC),
3526 "Undefined value assigned to typeglob");
3527 }
3528 else {
3529 GV *gv = gv_fetchsv(sstr, GV_ADD, SVt_PVGV);
3530 if (dstr != (SV*)gv) {
3531 if (GvGP(dstr))
3532 gp_free((GV*)dstr);
3533 GvGP(dstr) = gp_ref(GvGP(gv));
3534 }
3535 }
3536 }
8990e307 3537 else if (sflags & SVp_POK) {
765f542d 3538 bool isSwipe = 0;
79072805
LW
3539
3540 /*
3541 * Check to see if we can just swipe the string. If so, it's a
3542 * possible small lose on short strings, but a big win on long ones.
3f7c398e
SP
3543 * It might even be a win on short strings if SvPVX_const(dstr)
3544 * has to be allocated and SvPVX_const(sstr) has to be freed.
34482cd6
NC
3545 * Likewise if we can set up COW rather than doing an actual copy, we
3546 * drop to the else clause, as the swipe code and the COW setup code
3547 * have much in common.
79072805
LW
3548 */
3549
120fac95
NC
3550 /* Whichever path we take through the next code, we want this true,
3551 and doing it now facilitates the COW check. */
3552 (void)SvPOK_only(dstr);
3553
765f542d 3554 if (
34482cd6
NC
3555 /* If we're already COW then this clause is not true, and if COW
3556 is allowed then we drop down to the else and make dest COW
3557 with us. If caller hasn't said that we're allowed to COW
3558 shared hash keys then we don't do the COW setup, even if the
3559 source scalar is a shared hash key scalar. */
3560 (((flags & SV_COW_SHARED_HASH_KEYS)
3561 ? (sflags & (SVf_FAKE|SVf_READONLY)) != (SVf_FAKE|SVf_READONLY)
3562 : 1 /* If making a COW copy is forbidden then the behaviour we
3563 desire is as if the source SV isn't actually already
3564 COW, even if it is. So we act as if the source flags
3565 are not COW, rather than actually testing them. */
3566 )
f8c7b90f 3567#ifndef PERL_OLD_COPY_ON_WRITE
34482cd6
NC
3568 /* The change that added SV_COW_SHARED_HASH_KEYS makes the logic
3569 when PERL_OLD_COPY_ON_WRITE is defined a little wrong.
3570 Conceptually PERL_OLD_COPY_ON_WRITE being defined should
3571 override SV_COW_SHARED_HASH_KEYS, because it means "always COW"
3572 but in turn, it's somewhat dead code, never expected to go
3573 live, but more kept as a placeholder on how to do it better
3574 in a newer implementation. */
3575 /* If we are COW and dstr is a suitable target then we drop down
3576 into the else and make dest a COW of us. */
b8f9541a
NC
3577 || (SvFLAGS(dstr) & CAN_COW_MASK) != CAN_COW_FLAGS
3578#endif
3579 )
765f542d 3580 &&
765f542d
NC
3581 !(isSwipe =
3582 (sflags & SVs_TEMP) && /* slated for free anyway? */
3583 !(sflags & SVf_OOK) && /* and not involved in OOK hack? */
5fcdf167
NC
3584 (!(flags & SV_NOSTEAL)) &&
3585 /* and we're allowed to steal temps */
765f542d
NC
3586 SvREFCNT(sstr) == 1 && /* and no other references to it? */
3587 SvLEN(sstr) && /* and really is a string */
645c22ef 3588 /* and won't be needed again, potentially */
765f542d 3589 !(PL_op && PL_op->op_type == OP_AASSIGN))
f8c7b90f 3590#ifdef PERL_OLD_COPY_ON_WRITE
765f542d 3591 && !((sflags & CAN_COW_MASK) == CAN_COW_FLAGS
120fac95 3592 && (SvFLAGS(dstr) & CAN_COW_MASK) == CAN_COW_FLAGS
765f542d
NC
3593 && SvTYPE(sstr) >= SVt_PVIV)
3594#endif
3595 ) {
3596 /* Failed the swipe test, and it's not a shared hash key either.
3597 Have to copy the string. */
3598 STRLEN len = SvCUR(sstr);
3599 SvGROW(dstr, len + 1); /* inlined from sv_setpvn */
3f7c398e 3600 Move(SvPVX_const(sstr),SvPVX(dstr),len,char);
765f542d
NC
3601 SvCUR_set(dstr, len);
3602 *SvEND(dstr) = '\0';
765f542d 3603 } else {
f8c7b90f 3604 /* If PERL_OLD_COPY_ON_WRITE is not defined, then isSwipe will always
765f542d 3605 be true in here. */
765f542d
NC
3606 /* Either it's a shared hash key, or it's suitable for
3607 copy-on-write or we can swipe the string. */
46187eeb 3608 if (DEBUG_C_TEST) {
ed252734 3609 PerlIO_printf(Perl_debug_log, "Copy on write: sstr --> dstr\n");
e419cbc5
NC
3610 sv_dump(sstr);
3611 sv_dump(dstr);
46187eeb 3612 }
f8c7b90f 3613#ifdef PERL_OLD_COPY_ON_WRITE
765f542d
NC
3614 if (!isSwipe) {
3615 /* I believe I should acquire a global SV mutex if
3616 it's a COW sv (not a shared hash key) to stop
3617 it going un copy-on-write.
3618 If the source SV has gone un copy on write between up there
3619 and down here, then (assert() that) it is of the correct
3620 form to make it copy on write again */
3621 if ((sflags & (SVf_FAKE | SVf_READONLY))
3622 != (SVf_FAKE | SVf_READONLY)) {
3623 SvREADONLY_on(sstr);
3624 SvFAKE_on(sstr);
3625 /* Make the source SV into a loop of 1.
3626 (about to become 2) */
a29f6d03 3627 SV_COW_NEXT_SV_SET(sstr, sstr);
765f542d
NC
3628 }
3629 }
3630#endif
3631 /* Initial code is common. */
94010e71
NC
3632 if (SvPVX_const(dstr)) { /* we know that dtype >= SVt_PV */
3633 SvPV_free(dstr);
79072805 3634 }
765f542d 3635
765f542d
NC
3636 if (!isSwipe) {
3637 /* making another shared SV. */
3638 STRLEN cur = SvCUR(sstr);
3639 STRLEN len = SvLEN(sstr);
f8c7b90f 3640#ifdef PERL_OLD_COPY_ON_WRITE
765f542d 3641 if (len) {
b8f9541a 3642 assert (SvTYPE(dstr) >= SVt_PVIV);
765f542d
NC
3643 /* SvIsCOW_normal */
3644 /* splice us in between source and next-after-source. */
a29f6d03
NC
3645 SV_COW_NEXT_SV_SET(dstr, SV_COW_NEXT_SV(sstr));
3646 SV_COW_NEXT_SV_SET(sstr, dstr);
940132f3 3647 SvPV_set(dstr, SvPVX_mutable(sstr));
a604c751
NC
3648 } else
3649#endif
3650 {
765f542d 3651 /* SvIsCOW_shared_hash */
46187eeb
NC
3652 DEBUG_C(PerlIO_printf(Perl_debug_log,
3653 "Copy on write: Sharing hash\n"));
b8f9541a 3654
bdd68bc3 3655 assert (SvTYPE(dstr) >= SVt_PV);
765f542d 3656 SvPV_set(dstr,
d1db91c6 3657 HEK_KEY(share_hek_hek(SvSHARED_HEK_FROM_PV(SvPVX_const(sstr)))));
bdd68bc3 3658 }
87a1ef3d
SP
3659 SvLEN_set(dstr, len);
3660 SvCUR_set(dstr, cur);
765f542d
NC
3661 SvREADONLY_on(dstr);
3662 SvFAKE_on(dstr);
3663 /* Relesase a global SV mutex. */
3664 }
3665 else
765f542d 3666 { /* Passes the swipe test. */
78d1e721 3667 SvPV_set(dstr, SvPVX_mutable(sstr));
765f542d
NC
3668 SvLEN_set(dstr, SvLEN(sstr));
3669 SvCUR_set(dstr, SvCUR(sstr));
3670
3671 SvTEMP_off(dstr);
3672 (void)SvOK_off(sstr); /* NOTE: nukes most SvFLAGS on sstr */
6136c704 3673 SvPV_set(sstr, NULL);
765f542d
NC
3674 SvLEN_set(sstr, 0);
3675 SvCUR_set(sstr, 0);
3676 SvTEMP_off(sstr);
3677 }
3678 }
8990e307 3679 if (sflags & SVp_NOK) {
9d6ce603 3680 SvNV_set(dstr, SvNVX(sstr));
79072805 3681 }
8990e307 3682 if (sflags & SVp_IOK) {
23525414
NC
3683 SvRELEASE_IVX(dstr);
3684 SvIV_set(dstr, SvIVX(sstr));
3685 /* Must do this otherwise some other overloaded use of 0x80000000
3686 gets confused. I guess SVpbm_VALID */
2b1c7e3e 3687 if (sflags & SVf_IVisUV)
25da4f38 3688 SvIsUV_on(dstr);
79072805 3689 }
96d4b0ee 3690 SvFLAGS(dstr) |= sflags & (SVf_IOK|SVp_IOK|SVf_NOK|SVp_NOK|SVf_UTF8);
4f2da183 3691 {
b0a11fe1 3692 const MAGIC * const smg = SvVSTRING_mg(sstr);
4f2da183
NC
3693 if (smg) {
3694 sv_magic(dstr, NULL, PERL_MAGIC_vstring,
3695 smg->mg_ptr, smg->mg_len);
3696 SvRMAGICAL_on(dstr);
3697 }
7a5fa8a2 3698 }
79072805 3699 }
5d581361 3700 else if (sflags & (SVp_IOK|SVp_NOK)) {
c2468cc7 3701 (void)SvOK_off(dstr);
96d4b0ee 3702 SvFLAGS(dstr) |= sflags & (SVf_IOK|SVp_IOK|SVf_IVisUV|SVf_NOK|SVp_NOK);
5d581361
NC
3703 if (sflags & SVp_IOK) {
3704 /* XXXX Do we want to set IsUV for IV(ROK)? Be extra safe... */
3705 SvIV_set(dstr, SvIVX(sstr));
3706 }
3332b3c1 3707 if (sflags & SVp_NOK) {