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-rw-r--r--src/pkg/runtime/hashmap.c1180
1 files changed, 1180 insertions, 0 deletions
diff --git a/src/pkg/runtime/hashmap.c b/src/pkg/runtime/hashmap.c
new file mode 100644
index 000000000..0c0e3e4a2
--- /dev/null
+++ b/src/pkg/runtime/hashmap.c
@@ -0,0 +1,1180 @@
+// 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 *end; /* points just past end 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->end = HASH_OFFSET (st->entry, bytes);
+ 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 *end_e = st->end;
+ 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 != end_e) {
+ struct hash_entry *cp_e = src_e;
+ int32 save_dst_i = dst_i;
+ while (cp_e != end_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 != end_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->end &&
+ (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->end && (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->end && (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 *end_e = old_st->end;
+ struct hash_entry *e;
+ void *dummy_result;
+ int32 used = 0;
+
+ flags |= HASH_REHASH;
+ for (e = old_st->entry; e != end_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->end && (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->end || 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 *end;
+
+ for (;;) {
+ int32 shift = HASH_BITS - (st->power + used);
+ int32 index_mask = (1 << st->power) - 1;
+ int32 i = (last_hash >> shift) & index_mask;
+
+ end = st->end;
+ e = HASH_OFFSET (st->entry, i * elemsize);
+ sub->start = st->entry;
+ sub->end = end;
+
+ 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 != end && ((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 *end = sub->end;
+ 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;
+ end = sub->end;
+ }
+ 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 != end && ((e_hash = e->hash) == HASH_NIL || e_hash <= last_hash)) {
+ e = HASH_OFFSET (e, elemsize);
+ }
+ }
+
+ for (;;) {
+ while (e != end && (e_hash = e->hash) == HASH_NIL) {
+ e = HASH_OFFSET (e, elemsize);
+ }
+ if (e == end) {
+ 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;
+ end = sub->end;
+ }
+ } 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->end = end = st->end;
+ }
+ }
+}
+
+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].end = h->st->end;
+}
+
+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 *end = st->end;
+ int32 lslots = (((byte *) end) - (byte *) e) / elemsize;
+ int32 lused = 0;
+
+ while (e != end) {
+ 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->end) {
+ 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");
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-23 18:03:01 +0000