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// Copyright 2013 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.
// Fast hashmap lookup specialized to a specific key type.
// Included by hashmap.c once for each specialized type.
// Note that this code differs from hash_lookup in that
// it returns a pointer to the result, not the result itself.
// The returned pointer is only valid until the next GC
// point, so the caller must dereference it before then.
// +build ignore
#pragma textflag 7
void
HASH_LOOKUP1(MapType *t, Hmap *h, KEYTYPE key, byte *value)
{
uintptr hash;
uintptr bucket, oldbucket;
Bucket *b;
uintptr i;
KEYTYPE *k;
byte *v;
uint8 top;
int8 keymaybe;
bool quickkey;
if(debug) {
runtime·prints("runtime.mapaccess1_fastXXX: map=");
runtime·printpointer(h);
runtime·prints("; key=");
t->key->alg->print(t->key->size, &key);
runtime·prints("\n");
}
if(h == nil || h->count == 0) {
value = empty_value;
FLUSH(&value);
return;
}
if(raceenabled)
runtime·racereadpc(h, runtime·getcallerpc(&t), HASH_LOOKUP1);
if(docheck)
check(t, h);
if(h->B == 0) {
// One-bucket table. Don't hash, just check each bucket entry.
if(HASMAYBE) {
keymaybe = -1;
}
quickkey = QUICKEQ(key);
b = (Bucket*)h->buckets;
for(i = 0, k = (KEYTYPE*)b->data, v = (byte*)(k + BUCKETSIZE); i < BUCKETSIZE; i++, k++, v += h->valuesize) {
if(b->tophash[i] != 0) {
if(quickkey && EQFUNC(key, *k)) {
value = v;
FLUSH(&value);
return;
}
if(HASMAYBE && EQMAYBE(key, *k)) {
// TODO: check if key.str matches. Add EQFUNCFAST?
if(keymaybe >= 0) {
// Two same-length strings in this bucket.
// use slow path.
// TODO: keep track of more than just 1. Especially
// if doing the TODO above.
goto dohash;
}
keymaybe = i;
}
}
}
if(HASMAYBE && keymaybe >= 0) {
k = (KEYTYPE*)b->data + keymaybe;
if(EQFUNC(key, *k)) {
value = (byte*)((KEYTYPE*)b->data + BUCKETSIZE) + keymaybe * h->valuesize;
FLUSH(&value);
return;
}
}
} else {
dohash:
hash = h->hash0;
HASHFUNC(&hash, sizeof(KEYTYPE), &key);
bucket = hash & (((uintptr)1 << h->B) - 1);
if(h->oldbuckets != nil) {
oldbucket = bucket & (((uintptr)1 << (h->B - 1)) - 1);
b = (Bucket*)(h->oldbuckets + oldbucket * h->bucketsize);
if(evacuated(b)) {
b = (Bucket*)(h->buckets + bucket * h->bucketsize);
}
} else {
b = (Bucket*)(h->buckets + bucket * h->bucketsize);
}
top = hash >> (sizeof(uintptr)*8 - 8);
if(top == 0)
top = 1;
do {
for(i = 0, k = (KEYTYPE*)b->data, v = (byte*)(k + BUCKETSIZE); i < BUCKETSIZE; i++, k++, v += h->valuesize) {
if(b->tophash[i] == top && EQFUNC(key, *k)) {
value = v;
FLUSH(&value);
return;
}
}
b = b->overflow;
} while(b != nil);
}
value = empty_value;
FLUSH(&value);
}
#pragma textflag 7
void
HASH_LOOKUP2(MapType *t, Hmap *h, KEYTYPE key, byte *value, bool res)
{
uintptr hash;
uintptr bucket, oldbucket;
Bucket *b;
uintptr i;
KEYTYPE *k;
byte *v;
uint8 top;
int8 keymaybe;
bool quickkey;
if(debug) {
runtime·prints("runtime.mapaccess2_fastXXX: map=");
runtime·printpointer(h);
runtime·prints("; key=");
t->key->alg->print(t->key->size, &key);
runtime·prints("\n");
}
if(h == nil || h->count == 0) {
value = empty_value;
res = false;
FLUSH(&value);
FLUSH(&res);
return;
}
if(raceenabled)
runtime·racereadpc(h, runtime·getcallerpc(&t), HASH_LOOKUP2);
if(docheck)
check(t, h);
if(h->B == 0) {
// One-bucket table. Don't hash, just check each bucket entry.
if(HASMAYBE) {
keymaybe = -1;
}
quickkey = QUICKEQ(key);
b = (Bucket*)h->buckets;
for(i = 0, k = (KEYTYPE*)b->data, v = (byte*)(k + BUCKETSIZE); i < BUCKETSIZE; i++, k++, v += h->valuesize) {
if(b->tophash[i] != 0) {
if(quickkey && EQFUNC(key, *k)) {
value = v;
res = true;
FLUSH(&value);
FLUSH(&res);
return;
}
if(HASMAYBE && EQMAYBE(key, *k)) {
// TODO: check if key.str matches. Add EQFUNCFAST?
if(keymaybe >= 0) {
// Two same-length strings in this bucket.
// use slow path.
// TODO: keep track of more than just 1. Especially
// if doing the TODO above.
goto dohash;
}
keymaybe = i;
}
}
}
if(HASMAYBE && keymaybe >= 0) {
k = (KEYTYPE*)b->data + keymaybe;
if(EQFUNC(key, *k)) {
value = (byte*)((KEYTYPE*)b->data + BUCKETSIZE) + keymaybe * h->valuesize;
res = true;
FLUSH(&value);
FLUSH(&res);
return;
}
}
} else {
dohash:
hash = h->hash0;
HASHFUNC(&hash, sizeof(KEYTYPE), &key);
bucket = hash & (((uintptr)1 << h->B) - 1);
if(h->oldbuckets != nil) {
oldbucket = bucket & (((uintptr)1 << (h->B - 1)) - 1);
b = (Bucket*)(h->oldbuckets + oldbucket * h->bucketsize);
if(evacuated(b)) {
b = (Bucket*)(h->buckets + bucket * h->bucketsize);
}
} else {
b = (Bucket*)(h->buckets + bucket * h->bucketsize);
}
top = hash >> (sizeof(uintptr)*8 - 8);
if(top == 0)
top = 1;
do {
for(i = 0, k = (KEYTYPE*)b->data, v = (byte*)(k + BUCKETSIZE); i < BUCKETSIZE; i++, k++, v += h->valuesize) {
if(b->tophash[i] == top && EQFUNC(key, *k)) {
value = v;
res = true;
FLUSH(&value);
FLUSH(&res);
return;
}
}
b = b->overflow;
} while(b != nil);
}
value = empty_value;
res = false;
FLUSH(&value);
FLUSH(&res);
}
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