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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/internal/config.h"
#include <errno.h>
#ifdef __APPLE__
# ifdef HAVE_CRT_EXTERNS_H
# include <crt_externs.h>
# else
# include "missing/crt_externs.h"
# endif
#endif
#include "debug_counter.h"
#include "id.h"
#include "internal.h"
#include "internal/array.h"
#include "internal/bignum.h"
#include "internal/basic_operators.h"
#include "internal/class.h"
#include "internal/cont.h"
#include "internal/error.h"
#include "internal/hash.h"
#include "internal/object.h"
#include "internal/proc.h"
#include "internal/st.h"
#include "internal/symbol.h"
#include "internal/thread.h"
#include "internal/time.h"
#include "internal/vm.h"
#include "probes.h"
#include "ruby/st.h"
#include "ruby/util.h"
#include "ruby_assert.h"
#include "symbol.h"
#include "ruby/thread_native.h"
#include "ruby/ractor.h"
#include "vm_sync.h"
#include "builtin.h"
// Conditional compilation macros for MMTk.
#include "internal/mmtk_macros.h"
#if USE_MMTK
#include "internal/mmtk_support.h" // For rb_mmtk_register_ppp
#endif
/* Flags of RHash
*
* 1: RHASH_PASS_AS_KEYWORDS
* The hash is flagged as Ruby 2 keywords hash.
* 2: RHASH_PROC_DEFAULT
* The hash has a default proc (rather than a default value).
* 3: RHASH_ST_TABLE_FLAG
* The hash uses a ST table (rather than an AR table).
* 4-7: RHASH_AR_TABLE_SIZE_MASK
* The size of the AR table.
* 8-11: RHASH_AR_TABLE_BOUND_MASK
* The bounds of the AR table.
* 13-19: RHASH_LEV_MASK
* The iterational level of the hash. Used to prevent modifications
* to the hash during iteration.
*/
#ifndef HASH_DEBUG
#define HASH_DEBUG 0
#endif
#if HASH_DEBUG
#include "internal/gc.h"
#endif
#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((VALUE)hash2));
}
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
*/
/* :nodoc: */
VALUE
rb_hash_freeze(VALUE hash)
{
return rb_obj_freeze(hash);
}
VALUE rb_cHash;
VALUE rb_cHash_empty_frozen;
static VALUE envtbl;
static ID id_hash, id_flatten_bang;
static ID id_hash_iter_lev;
#define id_default idDefault
VALUE
rb_hash_set_ifnone(VALUE hash, VALUE ifnone)
{
RB_OBJ_WRITE(hash, (&RHASH(hash)->ifnone), ifnone);
return hash;
}
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 (UNDEF_P(a) || UNDEF_P(b)) 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);
}
static 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;
switch (TYPE(a)) {
case T_SYMBOL:
if (STATIC_SYM_P(a)) {
hnum = a >> (RUBY_SPECIAL_SHIFT + ID_SCOPE_SHIFT);
hnum = rb_hash_start(hnum);
}
else {
hnum = RSYMBOL(a)->hashval;
}
break;
case T_FIXNUM:
case T_TRUE:
case T_FALSE:
case T_NIL:
hnum = rb_objid_hash((st_index_t)a);
break;
case T_STRING:
hnum = rb_str_hash(a);
break;
case T_BIGNUM:
hval = rb_big_hash(a);
hnum = FIX2LONG(hval);
break;
case T_FLOAT: /* prevent pathological behavior: [Bug #10761] */
hnum = rb_dbl_long_hash(rb_float_value(a));
break;
default:
hnum = other_func(a);
}
if ((SIGNED_VALUE)hnum > 0)
hnum &= FIXNUM_MAX;
else
hnum |= FIXNUM_MIN;
return (long)hnum;
}
VALUE rb_obj_hash(VALUE obj);
VALUE rb_vm_call0(rb_execution_context_t *ec, VALUE recv, ID id, int argc, const VALUE *argv, const rb_callable_method_entry_t *cme, int kw_splat);
static st_index_t
obj_any_hash(VALUE obj)
{
VALUE hval = Qundef;
VALUE klass = CLASS_OF(obj);
if (klass) {
const rb_callable_method_entry_t *cme = rb_callable_method_entry(klass, id_hash);
if (cme && METHOD_ENTRY_BASIC(cme)) {
// Optimize away the frame push overhead if it's the default Kernel#hash
if (cme->def->type == VM_METHOD_TYPE_CFUNC && cme->def->body.cfunc.func == (rb_cfunc_t)rb_obj_hash) {
hval = rb_obj_hash(obj);
}
else if (RBASIC_CLASS(cme->defined_class) == rb_mKernel) {
hval = rb_vm_call0(GET_EC(), obj, id_hash, 0, 0, cme, 0);
}
}
}
if (UNDEF_P(hval)) {
hval = rb_exec_recursive_outer_mid(hash_recursive, obj, 0, id_hash);
}
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);
if (sign < 0) {
hval = LONG2FIX(ul | FIXNUM_MIN);
}
else {
hval = LONG2FIX(ul & FIXNUM_MAX);
}
}
hval = rb_to_int(hval);
}
return FIX2LONG(hval);
}
st_index_t
rb_any_hash(VALUE a)
{
return any_hash(a, obj_any_hash);
}
VALUE
rb_hash(VALUE obj)
{
return LONG2FIX(any_hash(obj, 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)
static long
rb_objid_hash(st_index_t index)
{
return (long)st_index_hash(index);
}
static st_index_t
objid_hash(VALUE obj)
{
VALUE object_id = rb_obj_id(obj);
if (!FIXNUM_P(object_id))
object_id = rb_big_hash(object_id);
#if SIZEOF_LONG == SIZEOF_VOIDP
return (st_index_t)st_index_hash((st_index_t)NUM2LONG(object_id));
#elif SIZEOF_LONG_LONG == SIZEOF_VOIDP
return (st_index_t)st_index_hash((st_index_t)NUM2LL(object_id));
#endif
}
/**
* call-seq:
* obj.hash -> integer
*
* Generates an Integer hash value for this object. This function must have the
* property that <code>a.eql?(b)</code> implies <code>a.hash == b.hash</code>.
*
* The hash value is used along with #eql? by the Hash class to determine if
* two objects reference the same hash key. Any hash value that exceeds the
* capacity of an Integer will be truncated before being used.
*
* The hash value for an object may not be identical across invocations or
* implementations of Ruby. If you need a stable identifier across Ruby
* invocations and implementations you will need to generate one with a custom
* method.
*
* Certain core classes such as Integer use built-in hash calculations and
* do not call the #hash method when used as a hash key.
*
* When implementing your own #hash based on multiple values, the best
* practice is to combine the class and any values using the hash code of an
* array:
*
* For example:
*
* def hash
* [self.class, a, b, c].hash
* end
*
* The reason for this is that the Array#hash method already has logic for
* safely and efficiently combining multiple hash values.
*--
* \private
*++
*/
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);
}
#define identhash rb_hashtype_ident
const struct st_hash_type rb_hashtype_ident = {
rb_ident_cmp,
rb_ident_hash,
};
#define RHASH_IDENTHASH_P(hash) (RHASH_TYPE(hash) == &identhash)
#define RHASH_STRING_KEY_P(hash, key) (!RHASH_IDENTHASH_P(hash) && (rb_obj_class(key) == rb_cString))
typedef st_index_t st_hash_t;
/*
* RHASH_AR_TABLE_P(h):
* RHASH_AR_TABLE points to ar_table.
*
* !RHASH_AR_TABLE_P(h):
* RHASH_ST_TABLE 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
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_AR_TABLE(hash)->ar_hint.ary[index];
}
static inline void
ar_hint_set_hint(VALUE hash, unsigned int index, ar_hint_t hint)
{
RHASH_AR_TABLE(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 UNDEF_P(pair->key);
}
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_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)
static inline unsigned int
RHASH_AR_TABLE_BOUND(VALUE h)
{
HASH_ASSERT(RHASH_AR_TABLE_P(h));
const unsigned int bound = RHASH_AR_TABLE_BOUND_RAW(h);
HASH_ASSERT(bound <= RHASH_AR_TABLE_MAX_SIZE);
return bound;
}
#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, bound = RHASH_AR_TABLE_BOUND(hash);
fprintf(stderr, " size:%u bound:%u\n",
RHASH_AR_TABLE_SIZE(hash), bound);
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));
}
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(!UNDEF_P(k));
HASH_ASSERT(!UNDEF_P(v));
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);
}
return hash;
}
#else
#define hash_verify(h) ((void)0)
#endif
static inline int
RHASH_TABLE_EMPTY_P(VALUE hash)
{
return RHASH_SIZE(hash) == 0;
}
#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 void
hash_st_table_init(VALUE hash, const struct st_hash_type *type, st_index_t size)
{
st_init_existing_table_with_size(RHASH_ST_TABLE(hash), type, size);
RHASH_SET_ST_FLAG(hash);
}
void
rb_hash_st_table_set(VALUE hash, st_table *st)
{
HASH_ASSERT(st != NULL);
RHASH_SET_ST_FLAG(hash);
*RHASH_ST_TABLE(hash) = *st;
}
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;
memset(RHASH_AR_TABLE(h), 0, sizeof(ar_table));
}
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_AR_TABLE(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
hash_ar_free_and_clear_table(VALUE hash)
{
RHASH_AR_TABLE_CLEAR(hash);
HASH_ASSERT(RHASH_AR_TABLE_SIZE(hash) == 0);
HASH_ASSERT(RHASH_AR_TABLE_BOUND(hash) == 0);
}
void rb_st_add_direct_with_hash(st_table *tab, st_data_t key, st_data_t value, st_hash_t hash); // st.c
enum ar_each_key_type {
ar_each_key_copy,
ar_each_key_cmp,
ar_each_key_insert,
};
static inline int
ar_each_key(ar_table *ar, int max, enum ar_each_key_type type, st_data_t *dst_keys, st_table *new_tab, st_hash_t *hashes)
{
for (int i = 0; i < max; i++) {
ar_table_pair *pair = &ar->pairs[i];
switch (type) {
case ar_each_key_copy:
dst_keys[i] = pair->key;
break;
case ar_each_key_cmp:
if (dst_keys[i] != pair->key) return 1;
break;
case ar_each_key_insert:
if (UNDEF_P(pair->key)) continue; // deleted entry
rb_st_add_direct_with_hash(new_tab, pair->key, pair->val, hashes[i]);
break;
}
}
return 0;
}
static st_table *
ar_force_convert_table(VALUE hash, const char *file, int line)
{
if (RHASH_ST_TABLE_P(hash)) {
return RHASH_ST_TABLE(hash);
}
else {
ar_table *ar = RHASH_AR_TABLE(hash);
st_hash_t hashes[RHASH_AR_TABLE_MAX_SIZE];
unsigned int bound, size;
// prepare hash values
do {
st_data_t keys[RHASH_AR_TABLE_MAX_SIZE];
bound = RHASH_AR_TABLE_BOUND(hash);
size = RHASH_AR_TABLE_SIZE(hash);
ar_each_key(ar, bound, ar_each_key_copy, keys, NULL, NULL);
for (unsigned int i = 0; i < bound; i++) {
// do_hash calls #hash method and it can modify hash object
hashes[i] = UNDEF_P(keys[i]) ? 0 : ar_do_hash(keys[i]);
}
// check if modified
if (UNLIKELY(!RHASH_AR_TABLE_P(hash))) return RHASH_ST_TABLE(hash);
if (UNLIKELY(RHASH_AR_TABLE_BOUND(hash) != bound)) continue;
if (UNLIKELY(ar_each_key(ar, bound, ar_each_key_cmp, keys, NULL, NULL))) continue;
} while (0);
// make st
st_table tab;
st_table *new_tab = &tab;
st_init_existing_table_with_size(new_tab, &objhash, size);
ar_each_key(ar, bound, ar_each_key_insert, NULL, new_tab, hashes);
hash_ar_free_and_clear_table(hash);
RHASH_ST_TABLE_SET(hash, new_tab);
return RHASH_ST_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_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 void
ensure_ar_table(VALUE hash)
{
if (!RHASH_AR_TABLE_P(hash)) {
rb_raise(rb_eRuntimeError, "hash representation was changed during iteration");
}
}
static int
ar_general_foreach(VALUE hash, st_foreach_check_callback_func *func, 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);
st_data_t key = (st_data_t)pair->key;
st_data_t val = (st_data_t)pair->val;
enum st_retval retval = (*func)(key, val, arg, 0);
ensure_ar_table(hash);
/* 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) {
retval = (*replace)(&key, &val, arg, TRUE);
// TODO: pair should be same as pair before.
pair = RHASH_AR_TABLE_REF(hash, i);
pair->key = (VALUE)key;
pair->val = (VALUE)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, st_foreach_check_callback_func *func, st_update_callback_func *replace, st_data_t arg)
{
return ar_general_foreach(hash, func, replace, arg);
}
struct functor {
st_foreach_callback_func *func;
st_data_t arg;
};
static int
apply_functor(st_data_t k, st_data_t v, st_data_t d, int _)
{
const struct functor *f = (void *)d;
return f->func(k, v, f->arg);
}
static int
ar_foreach(VALUE hash, st_foreach_callback_func *func, st_data_t arg)
{
const struct functor f = { func, arg };
return ar_general_foreach(hash, apply_functor, NULL, (st_data_t)&f);
}
static int
ar_foreach_check(VALUE hash, st_foreach_check_callback_func *func, 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);
ensure_ar_table(hash);
hash_verify(hash);
switch (retval) {
case ST_CHECK: {
pair = RHASH_AR_TABLE_REF(hash, i);
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 (UNLIKELY(!RHASH_AR_TABLE_P(hash))) {
// `#hash` changes ar_table -> st_table
return -1;
}
if (RHASH_AR_TABLE_SIZE(hash) > 0) {
bin = ar_find_entry(hash, hash_value, key);
existing = (bin != RHASH_AR_TABLE_MAX_BOUND) ? TRUE : FALSE;
}