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hash.c
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/**********************************************************************
hash.c -
$Author$
created at: Mon Nov 22 18:51:18 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby/encoding.h"
#include "ruby/st.h"
#include "ruby/util.h"
#include "internal.h"
#include <errno.h>
#include "probes.h"
#include "id.h"
#include "symbol.h"
#include "debug_counter.h"
#include "transient_heap.h"
#include "ruby_assert.h"
#ifdef __APPLE__
# ifdef HAVE_CRT_EXTERNS_H
# include <crt_externs.h>
# else
# include "missing/crt_externs.h"
# endif
#endif
#ifndef HASH_DEBUG
#define HASH_DEBUG 0
#endif
#if HASH_DEBUG
#include "gc.h"
#endif
#define HAS_EXTRA_STATES(hash, klass) ( \
((klass = has_extra_methods(rb_obj_class(hash))) != 0) || \
FL_TEST((hash), FL_EXIVAR|FL_TAINT|RHASH_PROC_DEFAULT) || \
!NIL_P(RHASH_IFNONE(hash)))
#define SET_DEFAULT(hash, ifnone) ( \
FL_UNSET_RAW(hash, RHASH_PROC_DEFAULT), \
RHASH_SET_IFNONE(hash, ifnone))
#define SET_PROC_DEFAULT(hash, proc) set_proc_default(hash, proc)
#define COPY_DEFAULT(hash, hash2) copy_default(RHASH(hash), RHASH(hash2))
static inline void
copy_default(struct RHash *hash, const struct RHash *hash2)
{
hash->basic.flags &= ~RHASH_PROC_DEFAULT;
hash->basic.flags |= hash2->basic.flags & RHASH_PROC_DEFAULT;
RHASH_SET_IFNONE(hash, RHASH_IFNONE(hash2));
}
static VALUE
has_extra_methods(VALUE klass)
{
const VALUE base = rb_cHash;
VALUE c = klass;
while (c != base) {
if (rb_class_has_methods(c)) return klass;
c = RCLASS_SUPER(c);
}
return 0;
}
static VALUE rb_hash_s_try_convert(VALUE, VALUE);
/*
* Hash WB strategy:
* 1. Check mutate st_* functions
* * st_insert()
* * st_insert2()
* * st_update()
* * st_add_direct()
* 2. Insert WBs
*/
VALUE
rb_hash_freeze(VALUE hash)
{
return rb_obj_freeze(hash);
}
VALUE rb_cHash;
static VALUE envtbl;
static ID id_hash, id_yield, id_default, id_flatten_bang;
static ID id_hash_iter_lev;
VALUE
rb_hash_set_ifnone(VALUE hash, VALUE ifnone)
{
RB_OBJ_WRITE(hash, (&RHASH(hash)->ifnone), ifnone);
return hash;
}
static int
rb_any_cmp(VALUE a, VALUE b)
{
if (a == b) return 0;
if (RB_TYPE_P(a, T_STRING) && RBASIC(a)->klass == rb_cString &&
RB_TYPE_P(b, T_STRING) && RBASIC(b)->klass == rb_cString) {
return rb_str_hash_cmp(a, b);
}
if (a == Qundef || b == Qundef) return -1;
if (SYMBOL_P(a) && SYMBOL_P(b)) {
return a != b;
}
return !rb_eql(a, b);
}
static VALUE
hash_recursive(VALUE obj, VALUE arg, int recurse)
{
if (recurse) return INT2FIX(0);
return rb_funcallv(obj, id_hash, 0, 0);
}
VALUE
rb_hash(VALUE obj)
{
VALUE hval = rb_exec_recursive_outer(hash_recursive, obj, 0);
while (!FIXNUM_P(hval)) {
if (RB_TYPE_P(hval, T_BIGNUM)) {
int sign;
unsigned long ul;
sign = rb_integer_pack(hval, &ul, 1, sizeof(ul), 0,
INTEGER_PACK_NATIVE_BYTE_ORDER);
ul &= (1UL << (sizeof(long)*CHAR_BIT-1)) - 1;
if (sign < 0)
return LONG2FIX(-(long)ul);
return LONG2FIX((long)ul);
}
hval = rb_to_int(hval);
}
return hval;
}
long rb_objid_hash(st_index_t index);
static st_index_t
dbl_to_index(double d)
{
union {double d; st_index_t i;} u;
u.d = d;
return u.i;
}
long
rb_dbl_long_hash(double d)
{
/* normalize -0.0 to 0.0 */
if (d == 0.0) d = 0.0;
#if SIZEOF_INT == SIZEOF_VOIDP
return rb_memhash(&d, sizeof(d));
#else
return rb_objid_hash(dbl_to_index(d));
#endif
}
static inline long
any_hash(VALUE a, st_index_t (*other_func)(VALUE))
{
VALUE hval;
st_index_t hnum;
if (SPECIAL_CONST_P(a)) {
if (STATIC_SYM_P(a)) {
hnum = a >> (RUBY_SPECIAL_SHIFT + ID_SCOPE_SHIFT);
hnum = rb_hash_start(hnum);
goto out;
}
else if (FLONUM_P(a)) {
/* prevent pathological behavior: [Bug #10761] */
goto flt;
}
hnum = rb_objid_hash((st_index_t)a);
}
else if (BUILTIN_TYPE(a) == T_STRING) {
hnum = rb_str_hash(a);
}
else if (BUILTIN_TYPE(a) == T_SYMBOL) {
hnum = RSYMBOL(a)->hashval;
}
else if (BUILTIN_TYPE(a) == T_BIGNUM) {
hval = rb_big_hash(a);
hnum = FIX2LONG(hval);
}
else if (BUILTIN_TYPE(a) == T_FLOAT) {
flt:
hnum = rb_dbl_long_hash(rb_float_value(a));
}
else {
hnum = other_func(a);
}
out:
#if SIZEOF_LONG < SIZEOF_ST_INDEX_T
if (hnum > 0)
hnum &= (unsigned long)-1 >> 2;
else
hnum |= ~((unsigned long)-1 >> 2);
#else
hnum <<= 1;
hnum = RSHIFT(hnum, 1);
#endif
return (long)hnum;
}
static st_index_t
obj_any_hash(VALUE obj)
{
obj = rb_hash(obj);
return FIX2LONG(obj);
}
static st_index_t
rb_any_hash(VALUE a)
{
return any_hash(a, obj_any_hash);
}
/* Here is a hash function for 64-bit key. It is about 5 times faster
(2 times faster when uint128 type is absent) on Haswell than
tailored Spooky or City hash function can be. */
/* Here we two primes with random bit generation. */
static const uint64_t prime1 = ((uint64_t)0x2e0bb864 << 32) | 0xe9ea7df5;
static const uint32_t prime2 = 0x830fcab9;
static inline uint64_t
mult_and_mix(uint64_t m1, uint64_t m2)
{
#if defined HAVE_UINT128_T
uint128_t r = (uint128_t) m1 * (uint128_t) m2;
return (uint64_t) (r >> 64) ^ (uint64_t) r;
#else
uint64_t hm1 = m1 >> 32, hm2 = m2 >> 32;
uint64_t lm1 = m1, lm2 = m2;
uint64_t v64_128 = hm1 * hm2;
uint64_t v32_96 = hm1 * lm2 + lm1 * hm2;
uint64_t v1_32 = lm1 * lm2;
return (v64_128 + (v32_96 >> 32)) ^ ((v32_96 << 32) + v1_32);
#endif
}
static inline uint64_t
key64_hash(uint64_t key, uint32_t seed)
{
return mult_and_mix(key + seed, prime1);
}
/* Should cast down the result for each purpose */
#define st_index_hash(index) key64_hash(rb_hash_start(index), prime2)
long
rb_objid_hash(st_index_t index)
{
return (long)st_index_hash(index);
}
static st_index_t
objid_hash(VALUE obj)
{
#if SIZEOF_LONG == SIZEOF_VOIDP
return (st_index_t)st_index_hash((st_index_t)NUM2LONG(rb_obj_id(obj)));
#elif SIZEOF_LONG_LONG == SIZEOF_VOIDP
return (st_index_t)st_index_hash((st_index_t)NUM2LL(rb_obj_id(obj)));
#endif
}
VALUE
rb_obj_hash(VALUE obj)
{
long hnum = any_hash(obj, objid_hash);
return ST2FIX(hnum);
}
static const struct st_hash_type objhash = {
rb_any_cmp,
rb_any_hash,
};
#define rb_ident_cmp st_numcmp
static st_index_t
rb_ident_hash(st_data_t n)
{
#ifdef USE_FLONUM /* RUBY */
/*
* - flonum (on 64-bit) is pathologically bad, mix the actual
* float value in, but do not use the float value as-is since
* many integers get interpreted as 2.0 or -2.0 [Bug #10761]
*/
if (FLONUM_P(n)) {
n ^= dbl_to_index(rb_float_value(n));
}
#endif
return (st_index_t)st_index_hash((st_index_t)n);
}
static const struct st_hash_type identhash = {
rb_ident_cmp,
rb_ident_hash,
};
typedef st_index_t st_hash_t;
/*
* RHASH_AR_TABLE_P(h):
* * as.ar == NULL or
* as.ar points ar_table.
* * as.ar is allocated by transient heap or xmalloc.
*
* !RHASH_AR_TABLE_P(h):
* * as.st points st_table.
*/
#define RHASH_AR_TABLE_MAX_BOUND RHASH_AR_TABLE_MAX_SIZE
#define RHASH_AR_TABLE_REF(hash, n) (&RHASH_AR_TABLE(hash)->pairs[n])
#define RHASH_AR_CLEARED_HINT 0xff
typedef struct ar_table_pair_struct {
VALUE key;
VALUE val;
} ar_table_pair;
typedef struct ar_table_struct {
/* 64bit CPU: 8B * 2 * 8 = 128B */
ar_table_pair pairs[RHASH_AR_TABLE_MAX_SIZE];
} ar_table;
size_t
rb_hash_ar_table_size(void)
{
return sizeof(ar_table);
}
static inline st_hash_t
ar_do_hash(st_data_t key)
{
return (st_hash_t)rb_any_hash(key);
}
static inline ar_hint_t
ar_do_hash_hint(st_hash_t hash_value)
{
return (ar_hint_t)hash_value;
}
static inline ar_hint_t
ar_hint(VALUE hash, unsigned int index)
{
return RHASH(hash)->ar_hint.ary[index];
}
static inline void
ar_hint_set_hint(VALUE hash, unsigned int index, ar_hint_t hint)
{
RHASH(hash)->ar_hint.ary[index] = hint;
}
static inline void
ar_hint_set(VALUE hash, unsigned int index, st_hash_t hash_value)
{
ar_hint_set_hint(hash, index, ar_do_hash_hint(hash_value));
}
static inline void
ar_clear_entry(VALUE hash, unsigned int index)
{
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, index);
pair->key = Qundef;
ar_hint_set_hint(hash, index, RHASH_AR_CLEARED_HINT);
}
static inline int
ar_cleared_entry(VALUE hash, unsigned int index)
{
if (ar_hint(hash, index) == RHASH_AR_CLEARED_HINT) {
/* RHASH_AR_CLEARED_HINT is only a hint, not mean cleared entry,
* so you need to check key == Qundef
*/
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, index);
return pair->key == Qundef;
}
else {
return FALSE;
}
}
static inline void
ar_set_entry(VALUE hash, unsigned int index, st_data_t key, st_data_t val, st_hash_t hash_value)
{
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, index);
pair->key = key;
pair->val = val;
ar_hint_set(hash, index, hash_value);
}
#define RHASH_AR_TABLE_SIZE(h) (HASH_ASSERT(RHASH_AR_TABLE_P(h)), \
RHASH_AR_TABLE_SIZE_RAW(h))
#define RHASH_AR_TABLE_BOUND_RAW(h) \
((unsigned int)((RBASIC(h)->flags >> RHASH_AR_TABLE_BOUND_SHIFT) & \
(RHASH_AR_TABLE_BOUND_MASK >> RHASH_AR_TABLE_BOUND_SHIFT)))
#define RHASH_AR_TABLE_BOUND(h) (HASH_ASSERT(RHASH_AR_TABLE_P(h)), \
RHASH_AR_TABLE_BOUND_RAW(h))
#define RHASH_ST_TABLE_SET(h, s) rb_hash_st_table_set(h, s)
#define RHASH_TYPE(hash) (RHASH_AR_TABLE_P(hash) ? &objhash : RHASH_ST_TABLE(hash)->type)
#define HASH_ASSERT(expr) RUBY_ASSERT_MESG_WHEN(HASH_DEBUG, expr, #expr)
#if HASH_DEBUG
#define hash_verify(hash) hash_verify_(hash, __FILE__, __LINE__)
void
rb_hash_dump(VALUE hash)
{
rb_obj_info_dump(hash);
if (RHASH_AR_TABLE_P(hash)) {
unsigned i, n = 0, bound = RHASH_AR_TABLE_BOUND(hash);
fprintf(stderr, " size:%u bound:%u\n",
RHASH_AR_TABLE_SIZE(hash), RHASH_AR_TABLE_BOUND(hash));
for (i=0; i<bound; i++) {
st_data_t k, v;
if (!ar_cleared_entry(hash, i)) {
char b1[0x100], b2[0x100];
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, i);
k = pair->key;
v = pair->val;
fprintf(stderr, " %d key:%s val:%s hint:%02x\n", i,
rb_raw_obj_info(b1, 0x100, k),
rb_raw_obj_info(b2, 0x100, v),
ar_hint(hash, i));
n++;
}
else {
fprintf(stderr, " %d empty\n", i);
}
}
}
}
static VALUE
hash_verify_(VALUE hash, const char *file, int line)
{
HASH_ASSERT(RB_TYPE_P(hash, T_HASH));
if (RHASH_AR_TABLE_P(hash)) {
unsigned i, n = 0, bound = RHASH_AR_TABLE_BOUND(hash);
for (i=0; i<bound; i++) {
st_data_t k, v;
if (!ar_cleared_entry(hash, i)) {
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, i);
k = pair->key;
v = pair->val;
HASH_ASSERT(k != Qundef);
HASH_ASSERT(v != Qundef);
n++;
}
}
if (n != RHASH_AR_TABLE_SIZE(hash)) {
rb_bug("n:%u, RHASH_AR_TABLE_SIZE:%u", n, RHASH_AR_TABLE_SIZE(hash));
}
}
else {
HASH_ASSERT(RHASH_ST_TABLE(hash) != NULL);
HASH_ASSERT(RHASH_AR_TABLE_SIZE_RAW(hash) == 0);
HASH_ASSERT(RHASH_AR_TABLE_BOUND_RAW(hash) == 0);
}
if (RHASH_TRANSIENT_P(hash)) {
volatile st_data_t MAYBE_UNUSED(key) = RHASH_AR_TABLE_REF(hash, 0)->key; /* read */
HASH_ASSERT(RHASH_AR_TABLE(hash) != NULL);
HASH_ASSERT(rb_transient_heap_managed_ptr_p(RHASH_AR_TABLE(hash)));
}
return hash;
}
#else
#define hash_verify(h) ((void)0)
#endif
static inline int
RHASH_TABLE_NULL_P(VALUE hash)
{
if (RHASH(hash)->as.ar == NULL) {
HASH_ASSERT(RHASH_AR_TABLE_P(hash));
return TRUE;
}
else {
return FALSE;
}
}
static inline int
RHASH_TABLE_EMPTY_P(VALUE hash)
{
return RHASH_SIZE(hash) == 0;
}
MJIT_FUNC_EXPORTED int
rb_hash_ar_table_p(VALUE hash)
{
if (FL_TEST_RAW((hash), RHASH_ST_TABLE_FLAG)) {
HASH_ASSERT(RHASH(hash)->as.st != NULL);
return FALSE;
}
else {
return TRUE;
}
}
ar_table *
rb_hash_ar_table(VALUE hash)
{
HASH_ASSERT(RHASH_AR_TABLE_P(hash));
return RHASH(hash)->as.ar;
}
MJIT_FUNC_EXPORTED st_table *
rb_hash_st_table(VALUE hash)
{
HASH_ASSERT(!RHASH_AR_TABLE_P(hash));
return RHASH(hash)->as.st;
}
void
rb_hash_st_table_set(VALUE hash, st_table *st)
{
HASH_ASSERT(st != NULL);
FL_SET_RAW((hash), RHASH_ST_TABLE_FLAG);
RHASH(hash)->as.st = st;
}
static void
hash_ar_table_set(VALUE hash, ar_table *ar)
{
HASH_ASSERT(RHASH_AR_TABLE_P(hash));
HASH_ASSERT((RHASH_TRANSIENT_P(hash) && ar == NULL) ? FALSE : TRUE);
RHASH(hash)->as.ar = ar;
hash_verify(hash);
}
#define RHASH_SET_ST_FLAG(h) FL_SET_RAW(h, RHASH_ST_TABLE_FLAG)
#define RHASH_UNSET_ST_FLAG(h) FL_UNSET_RAW(h, RHASH_ST_TABLE_FLAG)
static inline void
RHASH_AR_TABLE_BOUND_SET(VALUE h, st_index_t n)
{
HASH_ASSERT(RHASH_AR_TABLE_P(h));
HASH_ASSERT(n <= RHASH_AR_TABLE_MAX_BOUND);
RBASIC(h)->flags &= ~RHASH_AR_TABLE_BOUND_MASK;
RBASIC(h)->flags |= n << RHASH_AR_TABLE_BOUND_SHIFT;
}
static inline void
RHASH_AR_TABLE_SIZE_SET(VALUE h, st_index_t n)
{
HASH_ASSERT(RHASH_AR_TABLE_P(h));
HASH_ASSERT(n <= RHASH_AR_TABLE_MAX_SIZE);
RBASIC(h)->flags &= ~RHASH_AR_TABLE_SIZE_MASK;
RBASIC(h)->flags |= n << RHASH_AR_TABLE_SIZE_SHIFT;
}
static inline void
HASH_AR_TABLE_SIZE_ADD(VALUE h, st_index_t n)
{
HASH_ASSERT(RHASH_AR_TABLE_P(h));
RHASH_AR_TABLE_SIZE_SET(h, RHASH_AR_TABLE_SIZE(h) + n);
hash_verify(h);
}
#define RHASH_AR_TABLE_SIZE_INC(h) HASH_AR_TABLE_SIZE_ADD(h, 1)
static inline void
RHASH_AR_TABLE_SIZE_DEC(VALUE h)
{
HASH_ASSERT(RHASH_AR_TABLE_P(h));
int new_size = RHASH_AR_TABLE_SIZE(h) - 1;
if (new_size != 0) {
RHASH_AR_TABLE_SIZE_SET(h, new_size);
}
else {
RHASH_AR_TABLE_SIZE_SET(h, 0);
RHASH_AR_TABLE_BOUND_SET(h, 0);
}
hash_verify(h);
}
static inline void
RHASH_AR_TABLE_CLEAR(VALUE h)
{
RBASIC(h)->flags &= ~RHASH_AR_TABLE_SIZE_MASK;
RBASIC(h)->flags &= ~RHASH_AR_TABLE_BOUND_MASK;
hash_ar_table_set(h, NULL);
}
static ar_table*
ar_alloc_table(VALUE hash)
{
ar_table *tab = (ar_table*)rb_transient_heap_alloc(hash, sizeof(ar_table));
if (tab != NULL) {
RHASH_SET_TRANSIENT_FLAG(hash);
}
else {
RHASH_UNSET_TRANSIENT_FLAG(hash);
tab = (ar_table*)ruby_xmalloc(sizeof(ar_table));
}
RHASH_AR_TABLE_SIZE_SET(hash, 0);
RHASH_AR_TABLE_BOUND_SET(hash, 0);
hash_ar_table_set(hash, tab);
return tab;
}
NOINLINE(static int ar_equal(VALUE x, VALUE y));
static int
ar_equal(VALUE x, VALUE y)
{
return rb_any_cmp(x, y) == 0;
}
static unsigned
ar_find_entry_hint(VALUE hash, ar_hint_t hint, st_data_t key)
{
unsigned i, bound = RHASH_AR_TABLE_BOUND(hash);
const ar_hint_t *hints = RHASH(hash)->ar_hint.ary;
/* if table is NULL, then bound also should be 0 */
for (i = 0; i < bound; i++) {
if (hints[i] == hint) {
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, i);
if (ar_equal(key, pair->key)) {
RB_DEBUG_COUNTER_INC(artable_hint_hit);
return i;
}
else {
#if 0
static int pid;
static char fname[256];
static FILE *fp;
if (pid != getpid()) {
snprintf(fname, sizeof(fname), "/tmp/ruby-armiss.%d", pid = getpid());
if ((fp = fopen(fname, "w")) == NULL) rb_bug("fopen");
}
st_hash_t h1 = ar_do_hash(key);
st_hash_t h2 = ar_do_hash(pair->key);
fprintf(fp, "miss: hash_eq:%d hints[%d]:%02x hint:%02x\n"
" key :%016lx %s\n"
" pair->key:%016lx %s\n",
h1 == h2, i, hints[i], hint,
h1, rb_obj_info(key), h2, rb_obj_info(pair->key));
#endif
RB_DEBUG_COUNTER_INC(artable_hint_miss);
}
}
}
RB_DEBUG_COUNTER_INC(artable_hint_notfound);
return RHASH_AR_TABLE_MAX_BOUND;
}
static unsigned
ar_find_entry(VALUE hash, st_hash_t hash_value, st_data_t key)
{
ar_hint_t hint = ar_do_hash_hint(hash_value);
return ar_find_entry_hint(hash, hint, key);
}
static inline void
ar_free_and_clear_table(VALUE hash)
{
ar_table *tab = RHASH_AR_TABLE(hash);
if (tab) {
if (RHASH_TRANSIENT_P(hash)) {
RHASH_UNSET_TRANSIENT_FLAG(hash);
}
else {
ruby_xfree(RHASH_AR_TABLE(hash));
}
RHASH_AR_TABLE_CLEAR(hash);
}
HASH_ASSERT(RHASH_AR_TABLE_SIZE(hash) == 0);
HASH_ASSERT(RHASH_AR_TABLE_BOUND(hash) == 0);
HASH_ASSERT(RHASH_TRANSIENT_P(hash) == 0);
}
static void
ar_try_convert_table(VALUE hash)
{
st_table *new_tab;
const unsigned size = RHASH_AR_TABLE_SIZE(hash);
st_index_t i;
if (!RHASH_AR_TABLE_P(hash) || size < RHASH_AR_TABLE_MAX_SIZE) {
return;
}
new_tab = st_init_table_with_size(&objhash, size * 2);
for (i = 0; i < RHASH_AR_TABLE_MAX_BOUND; i++) {
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, i);
st_add_direct(new_tab, pair->key, pair->val);
}
ar_free_and_clear_table(hash);
RHASH_ST_TABLE_SET(hash, new_tab);
return;
}
static st_table *
ar_force_convert_table(VALUE hash, const char *file, int line)
{
st_table *new_tab;
if (RHASH_ST_TABLE_P(hash)) {
return RHASH_ST_TABLE(hash);
}
if (RHASH_AR_TABLE(hash)) {
unsigned i, bound = RHASH_AR_TABLE_BOUND(hash);
#if RHASH_CONVERT_TABLE_DEBUG
rb_obj_info_dump(hash);
fprintf(stderr, "force_convert: %s:%d\n", file, line);
RB_DEBUG_COUNTER_INC(obj_hash_force_convert);
#endif
new_tab = st_init_table_with_size(&objhash, RHASH_AR_TABLE_SIZE(hash));
for (i = 0; i < bound; i++) {
if (ar_cleared_entry(hash, i)) continue;
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, i);
st_add_direct(new_tab, pair->key, pair->val);
}
ar_free_and_clear_table(hash);
}
else {
new_tab = st_init_table(&objhash);
}
RHASH_ST_TABLE_SET(hash, new_tab);
return new_tab;
}
static ar_table *
hash_ar_table(VALUE hash)
{
if (RHASH_TABLE_NULL_P(hash)) {
ar_alloc_table(hash);
}
return RHASH_AR_TABLE(hash);
}
static int
ar_compact_table(VALUE hash)
{
const unsigned bound = RHASH_AR_TABLE_BOUND(hash);
const unsigned size = RHASH_AR_TABLE_SIZE(hash);
if (size == bound) {
return size;
}
else {
unsigned i, j=0;
ar_table_pair *pairs = RHASH_AR_TABLE(hash)->pairs;
for (i=0; i<bound; i++) {
if (ar_cleared_entry(hash, i)) {
if (j <= i) j = i+1;
for (; j<bound; j++) {
if (!ar_cleared_entry(hash, j)) {
pairs[i] = pairs[j];
ar_hint_set_hint(hash, i, (st_hash_t)ar_hint(hash, j));
ar_clear_entry(hash, j);
j++;
goto found;
}
}
/* non-empty is not found */
goto done;
found:;
}
}
done:
HASH_ASSERT(i<=bound);
RHASH_AR_TABLE_BOUND_SET(hash, size);
hash_verify(hash);
return size;
}
}
static int
ar_add_direct_with_hash(VALUE hash, st_data_t key, st_data_t val, st_hash_t hash_value)
{
unsigned bin = RHASH_AR_TABLE_BOUND(hash);
if (RHASH_AR_TABLE_SIZE(hash) >= RHASH_AR_TABLE_MAX_SIZE) {
return 1;
}
else {
if (UNLIKELY(bin >= RHASH_AR_TABLE_MAX_BOUND)) {
bin = ar_compact_table(hash);
hash_ar_table(hash);
}
HASH_ASSERT(bin < RHASH_AR_TABLE_MAX_BOUND);
ar_set_entry(hash, bin, key, val, hash_value);
RHASH_AR_TABLE_BOUND_SET(hash, bin+1);
RHASH_AR_TABLE_SIZE_INC(hash);
return 0;
}
}
static int
ar_general_foreach(VALUE hash, int (*func)(ANYARGS), st_update_callback_func *replace, st_data_t arg)
{
if (RHASH_AR_TABLE_SIZE(hash) > 0) {
unsigned i, bound = RHASH_AR_TABLE_BOUND(hash);
for (i = 0; i < bound; i++) {
if (ar_cleared_entry(hash, i)) continue;
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, i);
enum st_retval retval = (*func)(pair->key, pair->val, arg, 0);
/* pair may be not valid here because of theap */
switch (retval) {
case ST_CONTINUE:
break;
case ST_CHECK:
case ST_STOP:
return 0;
case ST_REPLACE:
if (replace) {
VALUE key = pair->key;
VALUE val = pair->val;
retval = (*replace)(&key, &val, arg, TRUE);
// TODO: pair should be same as pair before.
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, i);
pair->key = key;
pair->val = val;
}
break;
case ST_DELETE:
ar_clear_entry(hash, i);
RHASH_AR_TABLE_SIZE_DEC(hash);
break;
}
}
}
return 0;
}
static int
ar_foreach_with_replace(VALUE hash, int (*func)(ANYARGS), st_update_callback_func *replace, st_data_t arg)
{
return ar_general_foreach(hash, func, replace, arg);
}
static int
ar_foreach(VALUE hash, int (*func)(ANYARGS), st_data_t arg)
{
return ar_general_foreach(hash, func, NULL, arg);
}
static int
ar_foreach_check(VALUE hash, int (*func)(ANYARGS), st_data_t arg,
st_data_t never)
{
if (RHASH_AR_TABLE_SIZE(hash) > 0) {
unsigned i, ret = 0, bound = RHASH_AR_TABLE_BOUND(hash);
enum st_retval retval;
st_data_t key;
ar_table_pair *pair;
ar_hint_t hint;
for (i = 0; i < bound; i++) {
if (ar_cleared_entry(hash, i)) continue;
pair = RHASH_AR_TABLE_REF(hash, i);
key = pair->key;
hint = ar_hint(hash, i);
retval = (*func)(key, pair->val, arg, 0);
hash_verify(hash);
switch (retval) {
case ST_CHECK: {
if (pair->key == never) break;
ret = ar_find_entry_hint(hash, hint, key);
if (ret == RHASH_AR_TABLE_MAX_BOUND) {
retval = (*func)(0, 0, arg, 1);
return 2;
}
}
case ST_CONTINUE:
break;
case ST_STOP:
case ST_REPLACE:
return 0;
case ST_DELETE: {
if (!ar_cleared_entry(hash, i)) {
ar_clear_entry(hash, i);
RHASH_AR_TABLE_SIZE_DEC(hash);
}
break;
}
}
}
}
return 0;
}
static int
ar_update(VALUE hash, st_data_t key,
st_update_callback_func *func, st_data_t arg)
{
int retval, existing;
unsigned bin = RHASH_AR_TABLE_MAX_BOUND;
st_data_t value = 0, old_key;
st_hash_t hash_value = ar_do_hash(key);
if (RHASH_AR_TABLE_SIZE(hash) > 0) {
bin = ar_find_entry(hash, hash_value, key);
existing = (bin != RHASH_AR_TABLE_MAX_BOUND) ? TRUE : FALSE;
}
else {
hash_ar_table(hash); /* allocate ltbl if needed */
existing = FALSE;
}
if (existing) {
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, bin);
key = pair->key;
value = pair->val;
}
old_key = key;
retval = (*func)(&key, &value, arg, existing);
/* pair can be invalid here because of theap */
switch (retval) {
case ST_CONTINUE:
if (!existing) {
if (ar_add_direct_with_hash(hash, key, value, hash_value)) {
return -1;
}
}
else {
ar_table_pair *pair = RHASH_AR_TABLE_REF(hash, bin);
if (old_key != key) {
pair->key = key;
}
pair->val = value;
}
break;
case ST_DELETE:
if (existing) {
ar_clear_entry(hash, bin);
RHASH_AR_TABLE_SIZE_DEC(hash);
}
break;
}