| 1 |
#include "EXTERN.h" |
| 2 |
#include "perl.h" |
| 3 |
#include "XSUB.h" |
| 4 |
|
| 5 |
/* pre-5.10 compatibility */ |
| 6 |
#ifndef GV_NOTQUAL |
| 7 |
# define GV_NOTQUAL 1 |
| 8 |
#endif |
| 9 |
#ifndef gv_fetchpvs |
| 10 |
# define gv_fetchpvs gv_fetchpv |
| 11 |
#endif |
| 12 |
|
| 13 |
/* pre-5.8 compatibility */ |
| 14 |
#ifndef PERL_MAGIC_tied |
| 15 |
# define PERL_MAGIC_tied 'P' |
| 16 |
#endif |
| 17 |
|
| 18 |
#include "multicall.h" |
| 19 |
|
| 20 |
/* workaround for buggy multicall API */ |
| 21 |
#ifndef cxinc |
| 22 |
# define cxinc() Perl_cxinc (aTHX) |
| 23 |
#endif |
| 24 |
|
| 25 |
#define dCMP \ |
| 26 |
dMULTICALL; \ |
| 27 |
void *cmp_data; \ |
| 28 |
I32 gimme = G_SCALAR; |
| 29 |
|
| 30 |
#define CMP_PUSH(sv) \ |
| 31 |
PUSH_MULTICALL (cmp_push_ (sv));\ |
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cmp_data = multicall_cop; |
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|
| 34 |
#define CMP_POP \ |
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POP_MULTICALL; |
| 36 |
|
| 37 |
#define dCMP_CALL(data) \ |
| 38 |
OP *multicall_cop = (OP *)data; |
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|
| 40 |
static void * |
| 41 |
cmp_push_ (SV *sv) |
| 42 |
{ |
| 43 |
HV *st; |
| 44 |
GV *gvp; |
| 45 |
CV *cv; |
| 46 |
|
| 47 |
cv = sv_2cv (sv, &st, &gvp, 0); |
| 48 |
|
| 49 |
if (!cv) |
| 50 |
croak ("%s: callback must be a CODE reference or another callable object", SvPV_nolen (sv)); |
| 51 |
|
| 52 |
if (!PL_firstgv) PL_firstgv = gv_fetchpvs ("a", GV_ADD | GV_NOTQUAL, SVt_PV); |
| 53 |
if (!PL_secondgv) PL_secondgv = gv_fetchpvs ("b", GV_ADD | GV_NOTQUAL, SVt_PV); |
| 54 |
|
| 55 |
SAVESPTR (GvSV (PL_firstgv)); |
| 56 |
SAVESPTR (GvSV (PL_secondgv)); |
| 57 |
|
| 58 |
return cv; |
| 59 |
} |
| 60 |
|
| 61 |
/*****************************************************************************/ |
| 62 |
|
| 63 |
static SV * |
| 64 |
sv_first (SV *sv) |
| 65 |
{ |
| 66 |
if (SvROK (sv) && SvTYPE (SvRV (sv)) == SVt_PVAV) |
| 67 |
{ |
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AV *av = (AV *)SvRV (sv); |
| 69 |
|
| 70 |
sv = AvFILLp (av) < 0 ? &PL_sv_undef : AvARRAY (av)[0]; |
| 71 |
} |
| 72 |
|
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return sv; |
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} |
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|
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static void |
| 77 |
set_idx (SV *sv, int idx) |
| 78 |
{ |
| 79 |
if (!SvROK (sv)) |
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return; |
| 81 |
|
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sv = SvRV (sv); |
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|
| 84 |
if (SvTYPE (sv) != SVt_PVAV) |
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return; |
| 86 |
|
| 87 |
if (AvFILL ((AV *)sv) < 1 || AvARRAY ((AV *)sv)[1] == &PL_sv_undef) |
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av_store ((AV *)sv, 1, newSViv (idx)); |
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else |
| 90 |
{ |
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sv = AvARRAY ((AV *)sv)[1]; |
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|
| 93 |
if (SvTYPE (sv) == SVt_IV) |
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SvIV_set (sv, idx); |
| 95 |
else |
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sv_setiv (sv, idx); |
| 97 |
} |
| 98 |
} |
| 99 |
|
| 100 |
#define set_heap(idx,he) \ |
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do { \ |
| 102 |
if (flags) \ |
| 103 |
set_idx (he, idx); \ |
| 104 |
heap [idx] = he; \ |
| 105 |
} while (0) |
| 106 |
|
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static int |
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cmp_nv (SV *a, SV *b, void *cmp_data) |
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{ |
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a = sv_first (a); |
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b = sv_first (b); |
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|
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return SvNV (a) > SvNV (b); |
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} |
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|
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static int |
| 117 |
cmp_sv (SV *a, SV *b, void *cmp_data) |
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{ |
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a = sv_first (a); |
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b = sv_first (b); |
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|
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return sv_cmp (a, b) > 0; |
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} |
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|
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static int |
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cmp_custom (SV *a, SV *b, void *cmp_data) |
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{ |
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dCMP_CALL (cmp_data); |
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|
| 130 |
GvSV (PL_firstgv) = a; |
| 131 |
GvSV (PL_secondgv) = b; |
| 132 |
|
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MULTICALL; |
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|
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if (SvTRUE (ERRSV)) |
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croak (NULL); |
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|
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{ |
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dSP; |
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return TOPi > 0; |
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} |
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} |
| 143 |
|
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/*****************************************************************************/ |
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|
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typedef int (*f_cmp)(SV *a, SV *b, void *cmp_data); |
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|
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static AV * |
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array (SV *ref) |
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{ |
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if (SvROK (ref) |
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&& SvTYPE (SvRV (ref)) == SVt_PVAV |
| 153 |
&& !SvTIED_mg (SvRV (ref), PERL_MAGIC_tied)) |
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return (AV *)SvRV (ref); |
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|
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croak ("argument 'heap' must be a (non-tied) array"); |
| 157 |
} |
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|
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#define gt(a,b) cmp ((a), (b), cmp_data) |
| 160 |
|
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/*****************************************************************************/ |
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|
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/* away from the root */ |
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static void |
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downheap (AV *av, f_cmp cmp, void *cmp_data, int N, int k, int flags) |
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{ |
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SV **heap = AvARRAY (av); |
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SV *he = heap [k]; |
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|
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for (;;) |
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{ |
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int c = (k << 1) + 1; |
| 173 |
|
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if (c >= N) |
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break; |
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|
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c += c + 1 < N && gt (heap [c], heap [c + 1]) |
| 178 |
? 1 : 0; |
| 179 |
|
| 180 |
if (!(gt (he, heap [c]))) |
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break; |
| 182 |
|
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set_heap (k, heap [c]); |
| 184 |
|
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k = c; |
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} |
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|
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set_heap (k, he); |
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} |
| 190 |
|
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/* towards the root */ |
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static void |
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upheap (AV *av, f_cmp cmp, void *cmp_data, int k, int flags) |
| 194 |
{ |
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SV **heap = AvARRAY (av); |
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SV *he = heap [k]; |
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|
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while (k) |
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{ |
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int p = (k - 1) >> 1; |
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|
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if (!(gt (heap [p], he))) |
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break; |
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|
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set_heap (k, heap [p]); |
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k = p; |
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} |
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|
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set_heap (k, he); |
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} |
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|
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/* move an element suitably so it is in a correct place */ |
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static void |
| 214 |
adjustheap (AV *av, f_cmp cmp, void *cmp_data, int N, int k, int flags) |
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{ |
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SV **heap = AvARRAY (av); |
| 217 |
|
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if (k > 0 && !gt (heap [k], heap [(k - 1) >> 1])) |
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upheap (av, cmp, cmp_data, k, flags); |
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else |
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downheap (av, cmp, cmp_data, N, k, flags); |
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} |
| 223 |
|
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/*****************************************************************************/ |
| 225 |
|
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static void |
| 227 |
make_heap (AV *av, f_cmp cmp, void *cmp_data, int flags) |
| 228 |
{ |
| 229 |
int i, len = AvFILLp (av); |
| 230 |
|
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/* do not use floyds algorithm, as I expect the simpler and more cache-efficient */ |
| 232 |
/* upheap is actually faster */ |
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for (i = 0; i <= len; ++i) |
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upheap (av, cmp, cmp_data, i, flags); |
| 235 |
} |
| 236 |
|
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static void |
| 238 |
push_heap (AV *av, f_cmp cmp, void *cmp_data, SV **elems, int nelems, int flags) |
| 239 |
{ |
| 240 |
int i; |
| 241 |
|
| 242 |
av_extend (av, AvFILLp (av) + nelems); |
| 243 |
|
| 244 |
/* we do it in two steps, as the perl cmp function might copy the stack */ |
| 245 |
for (i = 0; i < nelems; ++i) |
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AvARRAY (av)[++AvFILLp (av)] = newSVsv (elems [i]); |
| 247 |
|
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for (i = 0; i < nelems; ++i) |
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upheap (av, cmp, cmp_data, AvFILLp (av) - i, flags); |
| 250 |
} |
| 251 |
|
| 252 |
static SV * |
| 253 |
pop_heap (AV *av, f_cmp cmp, void *cmp_data, int flags) |
| 254 |
{ |
| 255 |
int len = AvFILLp (av); |
| 256 |
|
| 257 |
if (len < 0) |
| 258 |
return &PL_sv_undef; |
| 259 |
else if (len == 0) |
| 260 |
return av_pop (av); |
| 261 |
else |
| 262 |
{ |
| 263 |
SV *top = av_pop (av); |
| 264 |
SV *result = AvARRAY (av)[0]; |
| 265 |
AvARRAY (av)[0] = top; |
| 266 |
downheap (av, cmp, cmp_data, len, 0, flags); |
| 267 |
return result; |
| 268 |
} |
| 269 |
} |
| 270 |
|
| 271 |
static SV * |
| 272 |
splice_heap (AV *av, f_cmp cmp, void *cmp_data, int idx, int flags) |
| 273 |
{ |
| 274 |
int len = AvFILLp (av); |
| 275 |
|
| 276 |
if (len < 0 || idx > len) |
| 277 |
return &PL_sv_undef; |
| 278 |
else if (len == 0 || idx == len) |
| 279 |
return av_pop (av); /* the only or last element */ |
| 280 |
else |
| 281 |
{ |
| 282 |
SV *top = av_pop (av); |
| 283 |
SV *result = AvARRAY (av)[idx]; |
| 284 |
AvARRAY (av)[idx] = top; |
| 285 |
adjustheap (av, cmp, cmp_data, len, idx, flags); |
| 286 |
return result; |
| 287 |
} |
| 288 |
} |
| 289 |
|
| 290 |
static void |
| 291 |
adjust_heap (AV *av, f_cmp cmp, void *cmp_data, int idx, int flags) |
| 292 |
{ |
| 293 |
adjustheap (av, cmp, cmp_data, AvFILLp (av) + 1, idx, flags); |
| 294 |
} |
| 295 |
|
| 296 |
MODULE = Array::Heap PACKAGE = Array::Heap |
| 297 |
|
| 298 |
void |
| 299 |
make_heap (SV *heap) |
| 300 |
PROTOTYPE: \@ |
| 301 |
ALIAS: |
| 302 |
make_heap_idx = 1 |
| 303 |
CODE: |
| 304 |
make_heap (array (heap), cmp_nv, 0, ix); |
| 305 |
|
| 306 |
void |
| 307 |
make_heap_lex (SV *heap) |
| 308 |
PROTOTYPE: \@ |
| 309 |
CODE: |
| 310 |
make_heap (array (heap), cmp_sv, 0, 0); |
| 311 |
|
| 312 |
void |
| 313 |
make_heap_cmp (SV *cmp, SV *heap) |
| 314 |
PROTOTYPE: &\@ |
| 315 |
CODE: |
| 316 |
{ |
| 317 |
dCMP; |
| 318 |
CMP_PUSH (cmp); |
| 319 |
make_heap (array (heap), cmp_custom, cmp_data, 0); |
| 320 |
CMP_POP; |
| 321 |
} |
| 322 |
|
| 323 |
void |
| 324 |
push_heap (SV *heap, ...) |
| 325 |
PROTOTYPE: \@@ |
| 326 |
ALIAS: |
| 327 |
push_heap_idx = 1 |
| 328 |
CODE: |
| 329 |
push_heap (array (heap), cmp_nv, 0, &(ST(1)), items - 1, ix); |
| 330 |
|
| 331 |
void |
| 332 |
push_heap_lex (SV *heap, ...) |
| 333 |
PROTOTYPE: \@@ |
| 334 |
CODE: |
| 335 |
push_heap (array (heap), cmp_sv, 0, &(ST(1)), items - 1, 0); |
| 336 |
|
| 337 |
void |
| 338 |
push_heap_cmp (SV *cmp, SV *heap, ...) |
| 339 |
PROTOTYPE: &\@@ |
| 340 |
CODE: |
| 341 |
{ |
| 342 |
SV **st_2 = &(ST(2)); /* multicall.h uses PUSHSTACK */ |
| 343 |
dCMP; |
| 344 |
CMP_PUSH (cmp); |
| 345 |
push_heap (array (heap), cmp_custom, cmp_data, st_2, items - 2, 0); |
| 346 |
CMP_POP; |
| 347 |
} |
| 348 |
|
| 349 |
SV * |
| 350 |
pop_heap (SV *heap) |
| 351 |
PROTOTYPE: \@ |
| 352 |
ALIAS: |
| 353 |
pop_heap_idx = 1 |
| 354 |
CODE: |
| 355 |
RETVAL = pop_heap (array (heap), cmp_nv, 0, ix); |
| 356 |
OUTPUT: |
| 357 |
RETVAL |
| 358 |
|
| 359 |
SV * |
| 360 |
pop_heap_lex (SV *heap) |
| 361 |
PROTOTYPE: \@ |
| 362 |
CODE: |
| 363 |
RETVAL = pop_heap (array (heap), cmp_sv, 0, 0); |
| 364 |
OUTPUT: |
| 365 |
RETVAL |
| 366 |
|
| 367 |
SV * |
| 368 |
pop_heap_cmp (SV *cmp, SV *heap) |
| 369 |
PROTOTYPE: &\@ |
| 370 |
CODE: |
| 371 |
{ |
| 372 |
dCMP; |
| 373 |
CMP_PUSH (cmp); |
| 374 |
RETVAL = pop_heap (array (heap), cmp_custom, cmp_data, 0); |
| 375 |
CMP_POP; |
| 376 |
} |
| 377 |
OUTPUT: |
| 378 |
RETVAL |
| 379 |
|
| 380 |
SV * |
| 381 |
splice_heap (SV *heap, int idx) |
| 382 |
PROTOTYPE: \@$ |
| 383 |
ALIAS: |
| 384 |
splice_heap_idx = 1 |
| 385 |
CODE: |
| 386 |
RETVAL = splice_heap (array (heap), cmp_nv, 0, idx, ix); |
| 387 |
OUTPUT: |
| 388 |
RETVAL |
| 389 |
|
| 390 |
SV * |
| 391 |
splice_heap_lex (SV *heap, int idx) |
| 392 |
PROTOTYPE: \@$ |
| 393 |
CODE: |
| 394 |
RETVAL = splice_heap (array (heap), cmp_sv, 0, idx, 0); |
| 395 |
OUTPUT: |
| 396 |
RETVAL |
| 397 |
|
| 398 |
SV * |
| 399 |
splice_heap_cmp (SV *cmp, SV *heap, int idx) |
| 400 |
PROTOTYPE: &\@$ |
| 401 |
CODE: |
| 402 |
{ |
| 403 |
dCMP; |
| 404 |
CMP_PUSH (cmp); |
| 405 |
RETVAL = splice_heap (array (heap), cmp_custom, cmp_data, idx, 0); |
| 406 |
CMP_POP; |
| 407 |
} |
| 408 |
OUTPUT: |
| 409 |
RETVAL |
| 410 |
|
| 411 |
void |
| 412 |
adjust_heap (SV *heap, int idx) |
| 413 |
PROTOTYPE: \@$ |
| 414 |
ALIAS: |
| 415 |
adjust_heap_idx = 1 |
| 416 |
CODE: |
| 417 |
adjust_heap (array (heap), cmp_nv, 0, idx, ix); |
| 418 |
|
| 419 |
void |
| 420 |
adjust_heap_lex (SV *heap, int idx) |
| 421 |
PROTOTYPE: \@$ |
| 422 |
CODE: |
| 423 |
adjust_heap (array (heap), cmp_sv, 0, idx, 0); |
| 424 |
|
| 425 |
void |
| 426 |
adjust_heap_cmp (SV *cmp, SV *heap, int idx) |
| 427 |
PROTOTYPE: &\@$ |
| 428 |
CODE: |
| 429 |
{ |
| 430 |
dCMP; |
| 431 |
CMP_PUSH (cmp); |
| 432 |
adjust_heap (array (heap), cmp_custom, cmp_data, idx, 0); |
| 433 |
CMP_POP; |
| 434 |
} |
| 435 |
|
