blob: 22664b548875705902067f25ba5fa74c95ab7d9b [file] [log] [blame]
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "runtime.h"
#include "hashmap.h"
#include "type.h"
/* Return a pointer to the struct/union of type "type"
whose "field" field is addressed by pointer "p". */
struct Hmap { /* a hash table; initialize with hash_init() */
uint32 count; /* elements in table - must be first */
uint8 datasize; /* amount of data to store in entry */
uint8 max_power; /* max power of 2 to create sub-tables */
uint8 max_probes; /* max entries to probe before rehashing */
uint8 indirectval; /* storing pointers to values */
int32 changes; /* inc'ed whenever a subtable is created/grown */
hash_hash_t (*data_hash) (uint32, void *a); /* return hash of *a */
uint32 (*data_eq) (uint32, void *a, void *b); /* return whether *a == *b */
void (*data_del) (uint32, void *arg, void *data); /* invoked on deletion */
struct hash_subtable *st; /* first-level table */
uint32 keysize;
uint32 valsize;
uint32 datavo;
// three sets of offsets: the digit counts how many
// of key, value are passed as inputs:
// 0 = func() (key, value)
// 1 = func(key) (value)
// 2 = func(key, value)
uint32 ko0;
uint32 vo0;
uint32 ko1;
uint32 vo1;
uint32 po1;
uint32 ko2;
uint32 vo2;
uint32 po2;
Alg* keyalg;
Alg* valalg;
};
struct hash_entry {
hash_hash_t hash; /* hash value of data */
byte data[1]; /* user data has "datasize" bytes */
};
struct hash_subtable {
uint8 power; /* bits used to index this table */
uint8 used; /* bits in hash used before reaching this table */
uint8 datasize; /* bytes of client data in an entry */
uint8 max_probes; /* max number of probes when searching */
int16 limit_bytes; /* max_probes * (datasize+sizeof (hash_hash_t)) */
struct hash_entry *last; /* points to last element of entry[] */
struct hash_entry entry[1]; /* 2**power+max_probes-1 elements of elemsize bytes */
};
#define HASH_DATA_EQ(h,x,y) ((*h->data_eq) (h->keysize, (x), (y)))
#define HASH_REHASH 0x2 /* an internal flag */
/* the number of bits used is stored in the flags word too */
#define HASH_USED(x) ((x) >> 2)
#define HASH_MAKE_USED(x) ((x) << 2)
#define HASH_LOW 6
#define HASH_ONE (((hash_hash_t)1) << HASH_LOW)
#define HASH_MASK (HASH_ONE - 1)
#define HASH_ADJUST(x) (((x) < HASH_ONE) << HASH_LOW)
#define HASH_BITS (sizeof (hash_hash_t) * 8)
#define HASH_SUBHASH HASH_MASK
#define HASH_NIL 0
#define HASH_NIL_MEMSET 0
#define HASH_OFFSET(base, byte_offset) \
((struct hash_entry *) (((byte *) (base)) + (byte_offset)))
/* return a hash layer with 2**power empty entries */
static struct hash_subtable *
hash_subtable_new (Hmap *h, int32 power, int32 used)
{
int32 elemsize = h->datasize + offsetof (struct hash_entry, data[0]);
int32 bytes = elemsize << power;
struct hash_subtable *st;
int32 limit_bytes = h->max_probes * elemsize;
int32 max_probes = h->max_probes;
if (bytes < limit_bytes) {
limit_bytes = bytes;
max_probes = 1 << power;
}
bytes += limit_bytes - elemsize;
st = malloc (offsetof (struct hash_subtable, entry[0]) + bytes);
st->power = power;
st->used = used;
st->datasize = h->datasize;
st->max_probes = max_probes;
st->limit_bytes = limit_bytes;
st->last = HASH_OFFSET (st->entry, bytes) - 1;
memset (st->entry, HASH_NIL_MEMSET, bytes);
return (st);
}
static void
init_sizes (int64 hint, int32 *init_power, int32 *max_power)
{
int32 log = 0;
int32 i;
for (i = 32; i != 0; i >>= 1) {
if ((hint >> (log + i)) != 0) {
log += i;
}
}
log += 1 + (((hint << 3) >> log) >= 11); /* round up for utilization */
if (log <= 14) {
*init_power = log;
} else {
*init_power = 12;
}
*max_power = 12;
}
static void
hash_init (Hmap *h,
int32 datasize,
hash_hash_t (*data_hash) (uint32, void *),
uint32 (*data_eq) (uint32, void *, void *),
void (*data_del) (uint32, void *, void *),
int64 hint)
{
int32 init_power;
int32 max_power;
if(datasize < sizeof (void *))
datasize = sizeof (void *);
datasize = runtime·rnd(datasize, sizeof (void *));
init_sizes (hint, &init_power, &max_power);
h->datasize = datasize;
h->max_power = max_power;
h->max_probes = 15;
assert (h->datasize == datasize);
assert (h->max_power == max_power);
assert (sizeof (void *) <= h->datasize || h->max_power == 255);
h->count = 0;
h->changes = 0;
h->data_hash = data_hash;
h->data_eq = data_eq;
h->data_del = data_del;
h->st = hash_subtable_new (h, init_power, 0);
}
static void
hash_remove_n (struct hash_subtable *st, struct hash_entry *dst_e, int32 n)
{
int32 elemsize = st->datasize + offsetof (struct hash_entry, data[0]);
struct hash_entry *src_e = HASH_OFFSET (dst_e, n * elemsize);
struct hash_entry *last_e = st->last;
int32 shift = HASH_BITS - (st->power + st->used);
int32 index_mask = (((hash_hash_t)1) << st->power) - 1;
int32 dst_i = (((byte *) dst_e) - ((byte *) st->entry)) / elemsize;
int32 src_i = dst_i + n;
hash_hash_t hash;
int32 skip;
int32 bytes;
while (dst_e != src_e) {
if (src_e <= last_e) {
struct hash_entry *cp_e = src_e;
int32 save_dst_i = dst_i;
while (cp_e <= last_e && (hash = cp_e->hash) != HASH_NIL &&
((hash >> shift) & index_mask) <= dst_i) {
cp_e = HASH_OFFSET (cp_e, elemsize);
dst_i++;
}
bytes = ((byte *) cp_e) - (byte *) src_e;
memmove (dst_e, src_e, bytes);
dst_e = HASH_OFFSET (dst_e, bytes);
src_e = cp_e;
src_i += dst_i - save_dst_i;
if (src_e <= last_e && (hash = src_e->hash) != HASH_NIL) {
skip = ((hash >> shift) & index_mask) - dst_i;
} else {
skip = src_i - dst_i;
}
} else {
skip = src_i - dst_i;
}
bytes = skip * elemsize;
memset (dst_e, HASH_NIL_MEMSET, bytes);
dst_e = HASH_OFFSET (dst_e, bytes);
dst_i += skip;
}
}
static int32
hash_insert_internal (struct hash_subtable **pst, int32 flags, hash_hash_t hash,
Hmap *h, void *data, void **pres);
static void
hash_conv (Hmap *h,
struct hash_subtable *st, int32 flags,
hash_hash_t hash,
struct hash_entry *e)
{
int32 new_flags = (flags + HASH_MAKE_USED (st->power)) | HASH_REHASH;
int32 shift = HASH_BITS - HASH_USED (new_flags);
hash_hash_t prefix_mask = (-(hash_hash_t)1) << shift;
int32 elemsize = h->datasize + offsetof (struct hash_entry, data[0]);
void *dummy_result;
struct hash_entry *de;
int32 index_mask = (1 << st->power) - 1;
hash_hash_t e_hash;
struct hash_entry *pe = HASH_OFFSET (e, -elemsize);
while (e != st->entry && (e_hash = pe->hash) != HASH_NIL && (e_hash & HASH_MASK) != HASH_SUBHASH) {
e = pe;
pe = HASH_OFFSET (pe, -elemsize);
}
de = e;
while (e <= st->last &&
(e_hash = e->hash) != HASH_NIL &&
(e_hash & HASH_MASK) != HASH_SUBHASH) {
struct hash_entry *target_e = HASH_OFFSET (st->entry, ((e_hash >> shift) & index_mask) * elemsize);
struct hash_entry *ne = HASH_OFFSET (e, elemsize);
hash_hash_t current = e_hash & prefix_mask;
if (de < target_e) {
memset (de, HASH_NIL_MEMSET, ((byte *) target_e) - (byte *) de);
de = target_e;
}
if ((hash & prefix_mask) == current ||
(ne <= st->last && (e_hash = ne->hash) != HASH_NIL &&
(e_hash & prefix_mask) == current)) {
struct hash_subtable *new_st = hash_subtable_new (h, 1, HASH_USED (new_flags));
int32 rc = hash_insert_internal (&new_st, new_flags, e->hash, h, e->data, &dummy_result);
assert (rc == 0);
memcpy(dummy_result, e->data, h->datasize);
e = ne;
while (e <= st->last && (e_hash = e->hash) != HASH_NIL && (e_hash & prefix_mask) == current) {
assert ((e_hash & HASH_MASK) != HASH_SUBHASH);
rc = hash_insert_internal (&new_st, new_flags, e_hash, h, e->data, &dummy_result);
assert (rc == 0);
memcpy(dummy_result, e->data, h->datasize);
e = HASH_OFFSET (e, elemsize);
}
memset (de->data, HASH_NIL_MEMSET, h->datasize);
*(struct hash_subtable **)de->data = new_st;
de->hash = current | HASH_SUBHASH;
} else {
if (e != de) {
memcpy (de, e, elemsize);
}
e = HASH_OFFSET (e, elemsize);
}
de = HASH_OFFSET (de, elemsize);
}
if (e != de) {
hash_remove_n (st, de, (((byte *) e) - (byte *) de) / elemsize);
}
}
static void
hash_grow (Hmap *h, struct hash_subtable **pst, int32 flags)
{
struct hash_subtable *old_st = *pst;
int32 elemsize = h->datasize + offsetof (struct hash_entry, data[0]);
*pst = hash_subtable_new (h, old_st->power + 1, HASH_USED (flags));
struct hash_entry *last_e = old_st->last;
struct hash_entry *e;
void *dummy_result;
int32 used = 0;
flags |= HASH_REHASH;
for (e = old_st->entry; e <= last_e; e = HASH_OFFSET (e, elemsize)) {
hash_hash_t hash = e->hash;
if (hash != HASH_NIL) {
int32 rc = hash_insert_internal (pst, flags, e->hash, h, e->data, &dummy_result);
assert (rc == 0);
memcpy(dummy_result, e->data, h->datasize);
used++;
}
}
free (old_st);
}
static int32
hash_lookup (Hmap *h, void *data, void **pres)
{
int32 elemsize = h->datasize + offsetof (struct hash_entry, data[0]);
hash_hash_t hash = (*h->data_hash) (h->keysize, data) & ~HASH_MASK;
struct hash_subtable *st = h->st;
int32 used = 0;
hash_hash_t e_hash;
struct hash_entry *e;
struct hash_entry *end_e;
hash += HASH_ADJUST (hash);
for (;;) {
int32 shift = HASH_BITS - (st->power + used);
int32 index_mask = (1 << st->power) - 1;
int32 i = (hash >> shift) & index_mask; /* i is the natural position of hash */
e = HASH_OFFSET (st->entry, i * elemsize); /* e points to element i */
e_hash = e->hash;
if ((e_hash & HASH_MASK) != HASH_SUBHASH) { /* a subtable */
break;
}
used += st->power;
st = *(struct hash_subtable **)e->data;
}
end_e = HASH_OFFSET (e, st->limit_bytes);
while (e != end_e && (e_hash = e->hash) != HASH_NIL && e_hash < hash) {
e = HASH_OFFSET (e, elemsize);
}
while (e != end_e && ((e_hash = e->hash) ^ hash) < HASH_SUBHASH) {
if (HASH_DATA_EQ (h, data, e->data)) { /* a match */
*pres = e->data;
return (1);
}
e = HASH_OFFSET (e, elemsize);
}
USED(e_hash);
*pres = 0;
return (0);
}
static int32
hash_remove (Hmap *h, void *data, void *arg)
{
int32 elemsize = h->datasize + offsetof (struct hash_entry, data[0]);
hash_hash_t hash = (*h->data_hash) (h->keysize, data) & ~HASH_MASK;
struct hash_subtable *st = h->st;
int32 used = 0;
hash_hash_t e_hash;
struct hash_entry *e;
struct hash_entry *end_e;
hash += HASH_ADJUST (hash);
for (;;) {
int32 shift = HASH_BITS - (st->power + used);
int32 index_mask = (1 << st->power) - 1;
int32 i = (hash >> shift) & index_mask; /* i is the natural position of hash */
e = HASH_OFFSET (st->entry, i * elemsize); /* e points to element i */
e_hash = e->hash;
if ((e_hash & HASH_MASK) != HASH_SUBHASH) { /* a subtable */
break;
}
used += st->power;
st = *(struct hash_subtable **)e->data;
}
end_e = HASH_OFFSET (e, st->limit_bytes);
while (e != end_e && (e_hash = e->hash) != HASH_NIL && e_hash < hash) {
e = HASH_OFFSET (e, elemsize);
}
while (e != end_e && ((e_hash = e->hash) ^ hash) < HASH_SUBHASH) {
if (HASH_DATA_EQ (h, data, e->data)) { /* a match */
(*h->data_del) (h->datavo, arg, e->data);
hash_remove_n (st, e, 1);
h->count--;
return (1);
}
e = HASH_OFFSET (e, elemsize);
}
USED(e_hash);
return (0);
}
static int32
hash_insert_internal (struct hash_subtable **pst, int32 flags, hash_hash_t hash,
Hmap *h, void *data, void **pres)
{
int32 elemsize = h->datasize + offsetof (struct hash_entry, data[0]);
if ((flags & HASH_REHASH) == 0) {
hash += HASH_ADJUST (hash);
hash &= ~HASH_MASK;
}
for (;;) {
struct hash_subtable *st = *pst;
int32 shift = HASH_BITS - (st->power + HASH_USED (flags));
int32 index_mask = (1 << st->power) - 1;
int32 i = (hash >> shift) & index_mask; /* i is the natural position of hash */
struct hash_entry *start_e =
HASH_OFFSET (st->entry, i * elemsize); /* start_e is the pointer to element i */
struct hash_entry *e = start_e; /* e is going to range over [start_e, end_e) */
struct hash_entry *end_e;
hash_hash_t e_hash = e->hash;
if ((e_hash & HASH_MASK) == HASH_SUBHASH) { /* a subtable */
pst = (struct hash_subtable **) e->data;
flags += HASH_MAKE_USED (st->power);
continue;
}
end_e = HASH_OFFSET (start_e, st->limit_bytes);
while (e != end_e && (e_hash = e->hash) != HASH_NIL && e_hash < hash) {
e = HASH_OFFSET (e, elemsize);
i++;
}
if (e != end_e && e_hash != HASH_NIL) {
/* ins_e ranges over the elements that may match */
struct hash_entry *ins_e = e;
int32 ins_i = i;
hash_hash_t ins_e_hash;
while (ins_e != end_e && ((e_hash = ins_e->hash) ^ hash) < HASH_SUBHASH) {
if (HASH_DATA_EQ (h, data, ins_e->data)) { /* a match */
*pres = ins_e->data;
return (1);
}
assert (e_hash != hash || (flags & HASH_REHASH) == 0);
hash += (e_hash == hash); /* adjust hash if it collides */
ins_e = HASH_OFFSET (ins_e, elemsize);
ins_i++;
if (e_hash <= hash) { /* set e to insertion point */
e = ins_e;
i = ins_i;
}
}
/* set ins_e to the insertion point for the new element */
ins_e = e;
ins_i = i;
ins_e_hash = 0;
/* move ins_e to point at the end of the contiguous block, but
stop if any element can't be moved by one up */
while (ins_e <= st->last && (ins_e_hash = ins_e->hash) != HASH_NIL &&
ins_i + 1 - ((ins_e_hash >> shift) & index_mask) < st->max_probes &&
(ins_e_hash & HASH_MASK) != HASH_SUBHASH) {
ins_e = HASH_OFFSET (ins_e, elemsize);
ins_i++;
}
if (e == end_e || ins_e > st->last || ins_e_hash != HASH_NIL) {
e = end_e; /* can't insert; must grow or convert to subtable */
} else { /* make space for element */
memmove (HASH_OFFSET (e, elemsize), e, ((byte *) ins_e) - (byte *) e);
}
}
if (e != end_e) {
e->hash = hash;
*pres = e->data;
return (0);
}
h->changes++;
if (st->power < h->max_power) {
hash_grow (h, pst, flags);
} else {
hash_conv (h, st, flags, hash, start_e);
}
}
}
static int32
hash_insert (Hmap *h, void *data, void **pres)
{
int32 rc = hash_insert_internal (&h->st, 0, (*h->data_hash) (h->keysize, data), h, data, pres);
h->count += (rc == 0); /* increment count if element didn't previously exist */
return (rc);
}
static uint32
hash_count (Hmap *h)
{
return (h->count);
}
static void
iter_restart (struct hash_iter *it, struct hash_subtable *st, int32 used)
{
int32 elemsize = it->elemsize;
hash_hash_t last_hash = it->last_hash;
struct hash_entry *e;
hash_hash_t e_hash;
struct hash_iter_sub *sub = &it->subtable_state[it->i];
struct hash_entry *last;
for (;;) {
int32 shift = HASH_BITS - (st->power + used);
int32 index_mask = (1 << st->power) - 1;
int32 i = (last_hash >> shift) & index_mask;
last = st->last;
e = HASH_OFFSET (st->entry, i * elemsize);
sub->start = st->entry;
sub->last = last;
if ((e->hash & HASH_MASK) != HASH_SUBHASH) {
break;
}
sub->e = HASH_OFFSET (e, elemsize);
sub = &it->subtable_state[++(it->i)];
used += st->power;
st = *(struct hash_subtable **)e->data;
}
while (e <= last && ((e_hash = e->hash) == HASH_NIL || e_hash <= last_hash)) {
e = HASH_OFFSET (e, elemsize);
}
sub->e = e;
}
static void *
hash_next (struct hash_iter *it)
{
int32 elemsize = it->elemsize;
struct hash_iter_sub *sub = &it->subtable_state[it->i];
struct hash_entry *e = sub->e;
struct hash_entry *last = sub->last;
hash_hash_t e_hash = 0;
if (it->changes != it->h->changes) { /* hash table's structure changed; recompute */
it->changes = it->h->changes;
it->i = 0;
iter_restart (it, it->h->st, 0);
sub = &it->subtable_state[it->i];
e = sub->e;
last = sub->last;
}
if (e != sub->start && it->last_hash != HASH_OFFSET (e, -elemsize)->hash) {
struct hash_entry *start = HASH_OFFSET (e, -(elemsize * it->h->max_probes));
struct hash_entry *pe = HASH_OFFSET (e, -elemsize);
hash_hash_t last_hash = it->last_hash;
if (start < sub->start) {
start = sub->start;
}
while (e != start && ((e_hash = pe->hash) == HASH_NIL || last_hash < e_hash)) {
e = pe;
pe = HASH_OFFSET (pe, -elemsize);
}
while (e <= last && ((e_hash = e->hash) == HASH_NIL || e_hash <= last_hash)) {
e = HASH_OFFSET (e, elemsize);
}
}
for (;;) {
while (e <= last && (e_hash = e->hash) == HASH_NIL) {
e = HASH_OFFSET (e, elemsize);
}
if (e > last) {
if (it->i == 0) {
it->last_hash = HASH_OFFSET (e, -elemsize)->hash;
sub->e = e;
return (0);
} else {
it->i--;
sub = &it->subtable_state[it->i];
e = sub->e;
last = sub->last;
}
} else if ((e_hash & HASH_MASK) != HASH_SUBHASH) {
it->last_hash = e->hash;
sub->e = HASH_OFFSET (e, elemsize);
return (e->data);
} else {
struct hash_subtable *st =
*(struct hash_subtable **)e->data;
sub->e = HASH_OFFSET (e, elemsize);
it->i++;
assert (it->i < sizeof (it->subtable_state) /
sizeof (it->subtable_state[0]));
sub = &it->subtable_state[it->i];
sub->e = e = st->entry;
sub->start = st->entry;
sub->last = last = st->last;
}
}
}
static void
hash_iter_init (Hmap *h, struct hash_iter *it)
{
it->elemsize = h->datasize + offsetof (struct hash_entry, data[0]);
it->changes = h->changes;
it->i = 0;
it->h = h;
it->last_hash = 0;
it->subtable_state[0].e = h->st->entry;
it->subtable_state[0].start = h->st->entry;
it->subtable_state[0].last = h->st->last;
}
static void
clean_st (struct hash_subtable *st, int32 *slots, int32 *used)
{
int32 elemsize = st->datasize + offsetof (struct hash_entry, data[0]);
struct hash_entry *e = st->entry;
struct hash_entry *last = st->last;
int32 lslots = (((byte *) (last+1)) - (byte *) e) / elemsize;
int32 lused = 0;
while (e <= last) {
hash_hash_t hash = e->hash;
if ((hash & HASH_MASK) == HASH_SUBHASH) {
clean_st (*(struct hash_subtable **)e->data, slots, used);
} else {
lused += (hash != HASH_NIL);
}
e = HASH_OFFSET (e, elemsize);
}
free (st);
*slots += lslots;
*used += lused;
}
static void
hash_destroy (Hmap *h)
{
int32 slots = 0;
int32 used = 0;
clean_st (h->st, &slots, &used);
free (h);
}
static void
hash_visit_internal (struct hash_subtable *st,
int32 used, int32 level,
void (*data_visit) (void *arg, int32 level, void *data),
void *arg)
{
int32 elemsize = st->datasize + offsetof (struct hash_entry, data[0]);
struct hash_entry *e = st->entry;
int32 shift = HASH_BITS - (used + st->power);
int32 i = 0;
while (e <= st->last) {
int32 index = ((e->hash >> (shift - 1)) >> 1) & ((1 << st->power) - 1);
if ((e->hash & HASH_MASK) == HASH_SUBHASH) {
(*data_visit) (arg, level, e->data);
hash_visit_internal (*(struct hash_subtable **)e->data,
used + st->power, level + 1, data_visit, arg);
} else {
(*data_visit) (arg, level, e->data);
}
if (e->hash != HASH_NIL) {
assert (i < index + st->max_probes);
assert (index <= i);
}
e = HASH_OFFSET (e, elemsize);
i++;
}
}
static void
hash_visit (Hmap *h, void (*data_visit) (void *arg, int32 level, void *data), void *arg)
{
hash_visit_internal (h->st, 0, 0, data_visit, arg);
}
//
/// interfaces to go runtime
//
// hash requires < 256 bytes of data (key+value) stored inline.
// Only basic types can be key - biggest is complex128 (16 bytes).
// Leave some room to grow, just in case.
enum {
MaxValsize = 256 - 64
};
static void
donothing(uint32 s, void *a, void *b)
{
USED(s);
USED(a);
USED(b);
}
static void
freedata(uint32 datavo, void *a, void *b)
{
void *p;
USED(a);
p = *(void**)((byte*)b + datavo);
free(p);
}
static void**
hash_indirect(Hmap *h, void *p)
{
if(h->indirectval)
p = *(void**)p;
return p;
}
static int32 debug = 0;
// makemap(typ *Type, hint uint32) (hmap *map[any]any);
Hmap*
runtime·makemap_c(MapType *typ, int64 hint)
{
Hmap *h;
int32 keyalg, valalg, keysize, valsize, valsize_in_hash;
void (*data_del)(uint32, void*, void*);
Type *key, *val;
key = typ->key;
val = typ->elem;
if(hint < 0 || (int32)hint != hint)
runtime·panicstring("makemap: size out of range");
keyalg = key->alg;
valalg = val->alg;
keysize = key->size;
valsize = val->size;
if(keyalg >= nelem(runtime·algarray) || runtime·algarray[keyalg].hash == runtime·nohash) {
runtime·printf("map(keyalg=%d)\n", keyalg);
runtime·throw("runtime.makemap: unsupported map key type");
}
if(valalg >= nelem(runtime·algarray)) {
runtime·printf("map(valalg=%d)\n", valalg);
runtime·throw("runtime.makemap: unsupported map value type");
}
h = runtime·mal(sizeof(*h));
valsize_in_hash = valsize;
data_del = donothing;
if (valsize > MaxValsize) {
h->indirectval = 1;
data_del = freedata;
valsize_in_hash = sizeof(void*);
}
// align value inside data so that mark-sweep gc can find it.
// might remove in the future and just assume datavo == keysize.
h->datavo = keysize;
if(valsize_in_hash >= sizeof(void*))
h->datavo = runtime·rnd(keysize, sizeof(void*));
hash_init(h, h->datavo+valsize_in_hash,
runtime·algarray[keyalg].hash,
runtime·algarray[keyalg].equal,
data_del,
hint);
h->keysize = keysize;
h->valsize = valsize;
h->keyalg = &runtime·algarray[keyalg];
h->valalg = &runtime·algarray[valalg];
// these calculations are compiler dependent.
// figure out offsets of map call arguments.
// func() (key, val)
h->ko0 = runtime·rnd(sizeof(h), Structrnd);
h->vo0 = runtime·rnd(h->ko0+keysize, val->align);
// func(key) (val[, pres])
h->ko1 = runtime·rnd(sizeof(h), key->align);
h->vo1 = runtime·rnd(h->ko1+keysize, Structrnd);
h->po1 = h->vo1 + valsize;
// func(key, val[, pres])
h->ko2 = runtime·rnd(sizeof(h), key->align);
h->vo2 = runtime·rnd(h->ko2+keysize, val->align);
h->po2 = h->vo2 + valsize;
if(debug) {
runtime·printf("makemap: map=%p; keysize=%d; valsize=%d; keyalg=%d; valalg=%d; offsets=%d,%d; %d,%d,%d; %d,%d,%d\n",
h, keysize, valsize, keyalg, valalg, h->ko0, h->vo0, h->ko1, h->vo1, h->po1, h->ko2, h->vo2, h->po2);
}
return h;
}
// makemap(key, val *Type, hint int64) (hmap *map[any]any);
void
runtime·makemap(MapType *typ, int64 hint, Hmap *ret)
{
ret = runtime·makemap_c(typ, hint);
FLUSH(&ret);
}
// For reflect:
// func makemap(Type *mapType) (hmap *map)
void
reflect·makemap(MapType *t, Hmap *ret)
{
ret = runtime·makemap_c(t, 0);
FLUSH(&ret);
}
void
runtime·mapaccess(MapType *t, Hmap *h, byte *ak, byte *av, bool *pres)
{
byte *res;
Type *elem;
if(h == nil) {
elem = t->elem;
runtime·algarray[elem->alg].copy(elem->size, av, nil);
*pres = false;
return;
}
if(runtime·gcwaiting)
runtime·gosched();
res = nil;
if(hash_lookup(h, ak, (void**)&res)) {
*pres = true;
h->valalg->copy(h->valsize, av, hash_indirect(h, res+h->datavo));
} else {
*pres = false;
h->valalg->copy(h->valsize, av, nil);
}
}
// mapaccess1(hmap *map[any]any, key any) (val any);
#pragma textflag 7
void
runtime·mapaccess1(MapType *t, Hmap *h, ...)
{
byte *ak, *av;
bool pres;
if(h == nil) {
ak = (byte*)(&h + 1);
av = ak + runtime·rnd(t->key->size, Structrnd);
} else {
ak = (byte*)&h + h->ko1;
av = (byte*)&h + h->vo1;
}
runtime·mapaccess(t, h, ak, av, &pres);
if(debug) {
runtime·prints("runtime.mapaccess1: map=");
runtime·printpointer(h);
runtime·prints("; key=");
h->keyalg->print(h->keysize, ak);
runtime·prints("; val=");
h->valalg->print(h->valsize, av);
runtime·prints("; pres=");
runtime·printbool(pres);
runtime·prints("\n");
}
}
// mapaccess2(hmap *map[any]any, key any) (val any, pres bool);
#pragma textflag 7
void
runtime·mapaccess2(MapType *t, Hmap *h, ...)
{
byte *ak, *av, *ap;
if(h == nil) {
ak = (byte*)(&h + 1);
av = ak + runtime·rnd(t->key->size, Structrnd);
ap = av + t->elem->size;
} else {
ak = (byte*)&h + h->ko1;
av = (byte*)&h + h->vo1;
ap = (byte*)&h + h->po1;
}
runtime·mapaccess(t, h, ak, av, ap);
if(debug) {
runtime·prints("runtime.mapaccess2: map=");
runtime·printpointer(h);
runtime·prints("; key=");
h->keyalg->print(h->keysize, ak);
runtime·prints("; val=");
h->valalg->print(h->valsize, av);
runtime·prints("; pres=");
runtime·printbool(*ap);
runtime·prints("\n");
}
}
// For reflect:
// func mapaccess(t type, h map, key iword) (val iword, pres bool)
// where an iword is the same word an interface value would use:
// the actual data if it fits, or else a pointer to the data.
void
reflect·mapaccess(MapType *t, Hmap *h, uintptr key, uintptr val, bool pres)
{
byte *ak, *av;
if(t->key->size <= sizeof(key))
ak = (byte*)&key;
else
ak = (byte*)key;
val = 0;
pres = false;
if(t->elem->size <= sizeof(val))
av = (byte*)&val;
else {
av = runtime·mal(t->elem->size);
val = (uintptr)av;
}
runtime·mapaccess(t, h, ak, av, &pres);
FLUSH(&val);
FLUSH(&pres);
}
void
runtime·mapassign(MapType *t, Hmap *h, byte *ak, byte *av)
{
byte *res;
int32 hit;
USED(t);
if(h == nil)
runtime·panicstring("assignment to entry in nil map");
if(runtime·gcwaiting)
runtime·gosched();
res = nil;
if(av == nil) {
hash_remove(h, ak, (void**)&res);
return;
}
hit = hash_insert(h, ak, (void**)&res);
if(!hit && h->indirectval)
*(void**)(res+h->datavo) = runtime·mal(h->valsize);
h->keyalg->copy(h->keysize, res, ak);
h->valalg->copy(h->valsize, hash_indirect(h, res+h->datavo), av);
if(debug) {
runtime·prints("mapassign: map=");
runtime·printpointer(h);
runtime·prints("; key=");
h->keyalg->print(h->keysize, ak);
runtime·prints("; val=");
h->valalg->print(h->valsize, av);
runtime·prints("; hit=");
runtime·printint(hit);
runtime·prints("; res=");
runtime·printpointer(res);
runtime·prints("\n");
}
}
// mapassign1(mapType *type, hmap *map[any]any, key any, val any);
#pragma textflag 7
void
runtime·mapassign1(MapType *t, Hmap *h, ...)
{
byte *ak, *av;
if(h == nil)
runtime·panicstring("assignment to entry in nil map");
ak = (byte*)&h + h->ko2;
av = (byte*)&h + h->vo2;
runtime·mapassign(t, h, ak, av);
}
// mapassign2(mapType *type, hmap *map[any]any, key any, val any, pres bool);
#pragma textflag 7
void
runtime·mapassign2(MapType *t, Hmap *h, ...)
{
byte *ak, *av, *ap;
if(h == nil)
runtime·panicstring("assignment to entry in nil map");
ak = (byte*)&h + h->ko2;
av = (byte*)&h + h->vo2;
ap = (byte*)&h + h->po2;
if(*ap == false)
av = nil; // delete
runtime·mapassign(t, h, ak, av);
if(debug) {
runtime·prints("mapassign2: map=");
runtime·printpointer(h);
runtime·prints("; key=");
h->keyalg->print(h->keysize, ak);
runtime·prints("\n");
}
}
// For reflect:
// func mapassign(t type h map, key, val iword, pres bool)
// where an iword is the same word an interface value would use:
// the actual data if it fits, or else a pointer to the data.
void
reflect·mapassign(MapType *t, Hmap *h, uintptr key, uintptr val, bool pres)
{
byte *ak, *av;
if(h == nil)
runtime·panicstring("assignment to entry in nil map");
if(h->keysize <= sizeof(key))
ak = (byte*)&key;
else
ak = (byte*)key;
if(h->valsize <= sizeof(val))
av = (byte*)&val;
else
av = (byte*)val;
if(!pres)
av = nil;
runtime·mapassign(t, h, ak, av);
}
// mapiterinit(mapType *type, hmap *map[any]any, hiter *any);
void
runtime·mapiterinit(MapType*, Hmap *h, struct hash_iter *it)
{
if(h == nil) {
it->data = nil;
return;
}
hash_iter_init(h, it);
it->data = hash_next(it);
if(debug) {
runtime·prints("runtime.mapiterinit: map=");
runtime·printpointer(h);
runtime·prints("; iter=");
runtime·printpointer(it);
runtime·prints("; data=");
runtime·printpointer(it->data);
runtime·prints("\n");
}
}
// For reflect:
// func mapiterinit(h map) (it iter)
void
reflect·mapiterinit(MapType *t, Hmap *h, struct hash_iter *it)
{
it = runtime·mal(sizeof *it);
FLUSH(&it);
runtime·mapiterinit(t, h, it);
}
// mapiternext(hiter *any);
void
runtime·mapiternext(struct hash_iter *it)
{
if(runtime·gcwaiting)
runtime·gosched();
it->data = hash_next(it);
if(debug) {
runtime·prints("runtime.mapiternext: iter=");
runtime·printpointer(it);
runtime·prints("; data=");
runtime·printpointer(it->data);
runtime·prints("\n");
}
}
// For reflect:
// func mapiternext(it iter)
void
reflect·mapiternext(struct hash_iter *it)
{
runtime·mapiternext(it);
}
// mapiter1(hiter *any) (key any);
#pragma textflag 7
void
runtime·mapiter1(struct hash_iter *it, ...)
{
Hmap *h;
byte *ak, *res;
h = it->h;
ak = (byte*)&it + h->ko0;
res = it->data;
if(res == nil)
runtime·throw("runtime.mapiter1: key:val nil pointer");
h->keyalg->copy(h->keysize, ak, res);
if(debug) {
runtime·prints("mapiter2: iter=");
runtime·printpointer(it);
runtime·prints("; map=");
runtime·printpointer(h);
runtime·prints("\n");
}
}
bool
runtime·mapiterkey(struct hash_iter *it, void *ak)
{
Hmap *h;
byte *res;
h = it->h;
res = it->data;
if(res == nil)
return false;
h->keyalg->copy(h->keysize, ak, res);
return true;
}
// For reflect:
// func mapiterkey(h map) (key iword, ok bool)
// where an iword is the same word an interface value would use:
// the actual data if it fits, or else a pointer to the data.
void
reflect·mapiterkey(struct hash_iter *it, uintptr key, bool ok)
{
Hmap *h;
byte *res;
key = 0;
ok = false;
h = it->h;
res = it->data;
if(res == nil) {
key = 0;
ok = false;
} else {
key = 0;
if(h->keysize <= sizeof(key))
h->keyalg->copy(h->keysize, (byte*)&key, res);
else
key = (uintptr)res;
ok = true;
}
FLUSH(&key);
FLUSH(&ok);
}
// For reflect:
// func maplen(h map) (len int32)
// Like len(m) in the actual language, we treat the nil map as length 0.
void
reflect·maplen(Hmap *h, int32 len)
{
if(h == nil)
len = 0;
else
len = h->count;
FLUSH(&len);
}
// mapiter2(hiter *any) (key any, val any);
#pragma textflag 7
void
runtime·mapiter2(struct hash_iter *it, ...)
{
Hmap *h;
byte *ak, *av, *res;
h = it->h;
ak = (byte*)&it + h->ko0;
av = (byte*)&it + h->vo0;
res = it->data;
if(res == nil)
runtime·throw("runtime.mapiter2: key:val nil pointer");
h->keyalg->copy(h->keysize, ak, res);
h->valalg->copy(h->valsize, av, hash_indirect(h, res+h->datavo));
if(debug) {
runtime·prints("mapiter2: iter=");
runtime·printpointer(it);
runtime·prints("; map=");
runtime·printpointer(h);
runtime·prints("\n");
}
}