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/* This file is part of the Variable::Magic Perl module.
* See http://search.cpan.org/dist/Variable-Magic/ */
/* This is a pointer table implementation essentially copied from the ptr_table
* implementation in perl's sv.c, except that it has been modified to use memory
* shared across threads.
* Copyright goes to the original authors, bug reports to me. */
/* This header is designed to be included several times with different
* definitions for PTABLE_NAME and PTABLE_VAL_FREE(). */
#undef VOID2
#ifdef __cplusplus
# define VOID2(T, P) static_cast<T>(P)
#else
# define VOID2(T, P) (P)
#endif
#undef pPTBLMS
#undef pPTBLMS_
#undef aPTBLMS
#undef aPTBLMS_
/* Context for PerlMemShared_* functions */
#ifdef PERL_IMPLICIT_SYS
# define pPTBLMS pTHX
# define pPTBLMS_ pTHX_
# define aPTBLMS aTHX
# define aPTBLMS_ aTHX_
#else
# define pPTBLMS void
# define pPTBLMS_
# define aPTBLMS
# define aPTBLMS_
#endif
#ifndef pPTBL
# define pPTBL pPTBLMS
#endif
#ifndef pPTBL_
# define pPTBL_ pPTBLMS_
#endif
#ifndef aPTBL
# define aPTBL aPTBLMS
#endif
#ifndef aPTBL_
# define aPTBL_ aPTBLMS_
#endif
#ifndef PTABLE_NAME
# define PTABLE_NAME ptable
#endif
#ifndef PTABLE_VAL_FREE
# define PTABLE_VAL_FREE(V)
#endif
#ifndef PTABLE_JOIN
# define PTABLE_PASTE(A, B) A ## B
# define PTABLE_JOIN(A, B) PTABLE_PASTE(A, B)
#endif
#ifndef PTABLE_PREFIX
# define PTABLE_PREFIX(X) PTABLE_JOIN(PTABLE_NAME, X)
#endif
#ifndef ptable_ent
typedef struct ptable_ent {
struct ptable_ent *next;
const void * key;
void * val;
} ptable_ent;
#define ptable_ent ptable_ent
#endif /* !ptable_ent */
#ifndef ptable
typedef struct ptable {
ptable_ent **ary;
size_t max;
size_t items;
} ptable;
#define ptable ptable
#endif /* !ptable */
#ifndef ptable_new
STATIC ptable *ptable_new(pPTBLMS) {
#define ptable_new() ptable_new(aPTBLMS)
ptable *t = VOID2(ptable *, PerlMemShared_malloc(sizeof *t));
t->max = 15;
t->items = 0;
t->ary = VOID2(ptable_ent **,
PerlMemShared_calloc(t->max + 1, sizeof *t->ary));
return t;
}
#endif /* !ptable_new */
#ifndef PTABLE_HASH
# define PTABLE_HASH(ptr) \
((PTR2UV(ptr) >> 3) ^ (PTR2UV(ptr) >> (3 + 7)) ^ (PTR2UV(ptr) >> (3 + 17)))
#endif
#ifndef ptable_find
STATIC ptable_ent *ptable_find(const ptable * const t, const void * const key) {
#define ptable_find ptable_find
ptable_ent *ent;
const UV hash = PTABLE_HASH(key);
ent = t->ary[hash & t->max];
for (; ent; ent = ent->next) {
if (ent->key == key)
return ent;
}
return NULL;
}
#endif /* !ptable_find */
#ifndef ptable_fetch
STATIC void *ptable_fetch(const ptable * const t, const void * const key) {
#define ptable_fetch ptable_fetch
const ptable_ent *const ent = ptable_find(t, key);
return ent ? ent->val : NULL;
}
#endif /* !ptable_fetch */
#ifndef ptable_split
STATIC void ptable_split(pPTBLMS_ ptable * const t) {
#define ptable_split(T) ptable_split(aPTBLMS_ (T))
ptable_ent **ary = t->ary;
const size_t oldsize = t->max + 1;
size_t newsize = oldsize * 2;
size_t i;
ary = VOID2(ptable_ent **, PerlMemShared_realloc(ary, newsize * sizeof(*ary)));
Zero(&ary[oldsize], newsize - oldsize, sizeof(*ary));
t->max = --newsize;
t->ary = ary;
for (i = 0; i < oldsize; i++, ary++) {
ptable_ent **curentp, **entp, *ent;
if (!*ary)
continue;
curentp = ary + oldsize;
for (entp = ary, ent = *ary; ent; ent = *entp) {
if ((newsize & PTABLE_HASH(ent->key)) != i) {
*entp = ent->next;
ent->next = *curentp;
*curentp = ent;
continue;
} else
entp = &ent->next;
}
}
}
#endif /* !ptable_split */
STATIC void PTABLE_PREFIX(_store)(pPTBL_ ptable * const t, const void * const key, void * const val) {
ptable_ent *ent = ptable_find(t, key);
if (ent) {
void *oldval = ent->val;
PTABLE_VAL_FREE(oldval);
ent->val = val;
} else if (val) {
const size_t i = PTABLE_HASH(key) & t->max;
ent = VOID2(ptable_ent *, PerlMemShared_malloc(sizeof *ent));
ent->key = key;
ent->val = val;
ent->next = t->ary[i];
t->ary[i] = ent;
t->items++;
if (ent->next && t->items > t->max)
ptable_split(t);
}
}
#ifndef ptable_walk
STATIC void ptable_walk(pTHX_ ptable * const t, void (*cb)(pTHX_ ptable_ent *ent, void *userdata), void *userdata) {
#define ptable_walk(T, CB, UD) ptable_walk(aTHX_ (T), (CB), (UD))
if (t && t->items) {
register ptable_ent ** const array = t->ary;
size_t i = t->max;
do {
ptable_ent *entry;
for (entry = array[i]; entry; entry = entry->next)
cb(aTHX_ entry, userdata);
} while (i--);
}
}
#endif /* !ptable_walk */
STATIC void PTABLE_PREFIX(_clear)(pPTBL_ ptable * const t) {
if (t && t->items) {
register ptable_ent ** const array = t->ary;
size_t i = t->max;
do {
ptable_ent *entry = array[i];
while (entry) {
ptable_ent * const oentry = entry;
void *val = oentry->val;
entry = entry->next;
PTABLE_VAL_FREE(val);
PerlMemShared_free(oentry);
}
array[i] = NULL;
} while (i--);
t->items = 0;
}
}
STATIC void PTABLE_PREFIX(_free)(pPTBL_ ptable * const t) {
if (!t)
return;
PTABLE_PREFIX(_clear)(aPTBL_ t);
PerlMemShared_free(t->ary);
PerlMemShared_free(t);
}
#undef pPTBL
#undef pPTBL_
#undef aPTBL
#undef aPTBL_
#undef PTABLE_NAME
#undef PTABLE_VAL_FREE
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