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/* Copyright (C) 2021-2023 Free Software Foundation, Inc.
Contributed by Oracle.
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#ifndef _DBE_DEFAULTMAP_H
#define _DBE_DEFAULTMAP_H
#include <assert.h>
#include <vec.h>
#include <Map.h>
template <typename Key_t, typename Value_t>
class DefaultMap : public Map<Key_t, Value_t>
{
public:
DefaultMap ();
~DefaultMap ();
void clear ();
void put (Key_t key, Value_t val);
Value_t get (Key_t key);
Value_t get (Key_t key, typename Map<Key_t, Value_t>::Relation rel);
Value_t remove (Key_t);
Vector<Key_t> *keySet ();
Vector<Value_t> *values ();
private:
struct Entry
{
Key_t key;
Value_t val;
};
static const int CHUNK_SIZE;
static const int HTABLE_SIZE;
int entries;
int nchunks;
Entry **chunks;
Vector<Entry*> *index;
Entry **hashTable;
};
template <typename Key_t, typename Value_t>
const int DefaultMap<Key_t, Value_t>::CHUNK_SIZE = 16384;
template <typename Key_t, typename Value_t>
const int DefaultMap<Key_t, Value_t>::HTABLE_SIZE = 1024;
template <typename Key_t, typename Value_t>
DefaultMap<Key_t, Value_t>::DefaultMap ()
{
entries = 0;
nchunks = 0;
chunks = NULL;
index = new Vector<Entry*>;
hashTable = new Entry*[HTABLE_SIZE];
for (int i = 0; i < HTABLE_SIZE; i++)
hashTable[i] = NULL;
}
template <typename Key_t, typename Value_t>
DefaultMap<Key_t, Value_t>::~DefaultMap ()
{
for (int i = 0; i < nchunks; i++)
delete[] chunks[i];
delete[] chunks;
delete index;
delete[] hashTable;
}
template <typename Key_t, typename Value_t>
void
DefaultMap<Key_t, Value_t>::clear ()
{
entries = 0;
index->reset ();
for (int i = 0; i < HTABLE_SIZE; i++)
hashTable[i] = NULL;
}
template <typename Key_t>
inline unsigned
hash (Key_t key)
{
unsigned h = (unsigned) ((unsigned long) key);
h ^= (h >> 20) ^ (h >> 12);
return (h ^ (h >> 7) ^ (h >> 4));
}
template <typename Key_t, typename Value_t>
void
DefaultMap<Key_t, Value_t>::put (Key_t key, Value_t val)
{
unsigned idx = hash (key) % HTABLE_SIZE;
Entry *entry = hashTable[idx];
if (entry && entry->key == key)
{
entry->val = val;
return;
}
int lo = 0;
int hi = entries - 1;
while (lo <= hi)
{
int md = (lo + hi) / 2;
entry = index->fetch (md);
int cmp = entry->key < key ? -1 : entry->key > key ? 1 : 0;
if (cmp < 0)
lo = md + 1;
else if (cmp > 0)
hi = md - 1;
else
{
entry->val = val;
return;
}
}
if (entries >= nchunks * CHUNK_SIZE)
{
nchunks++;
// Reallocate Entry chunk array
Entry **new_chunks = new Entry*[nchunks];
for (int i = 0; i < nchunks - 1; i++)
new_chunks[i] = chunks[i];
delete[] chunks;
chunks = new_chunks;
// Allocate new chunk for entries.
chunks[nchunks - 1] = new Entry[CHUNK_SIZE];
}
entry = &chunks[entries / CHUNK_SIZE][entries % CHUNK_SIZE];
entry->key = key;
entry->val = val;
index->insert (lo, entry);
hashTable[idx] = entry;
entries++;
}
template <typename Key_t, typename Value_t>
Value_t
DefaultMap<Key_t, Value_t>::get (Key_t key)
{
unsigned idx = hash (key) % HTABLE_SIZE;
Entry *entry = hashTable[idx];
if (entry && entry->key == key)
return entry->val;
int lo = 0;
int hi = entries - 1;
while (lo <= hi)
{
int md = (lo + hi) / 2;
entry = index->fetch (md);
int cmp = entry->key < key ? -1 : entry->key > key ? 1 : 0;
if (cmp < 0)
lo = md + 1;
else if (cmp > 0)
hi = md - 1;
else
{
hashTable[idx] = entry;
return entry->val;
}
}
return (Value_t) 0;
}
template <typename Key_t, typename Value_t>
Value_t
DefaultMap<Key_t, Value_t>::get (Key_t key,
typename Map<Key_t, Value_t>::Relation rel)
{
if (rel != Map<Key_t, Value_t>::REL_EQ)
return (Value_t) 0;
return get (key);
}
template <typename Key_t, typename Value_t>
Value_t
DefaultMap<Key_t, Value_t>::remove (Key_t)
{
// Not implemented
if (1)
assert (0);
return (Value_t) 0;
}
template <typename Key_t, typename Value_t>
Vector<Value_t> *
DefaultMap<Key_t, Value_t>::values ()
{
Vector<Value_t> *vals = new Vector<Value_t>(entries);
for (int i = 0; i < entries; ++i)
{
Entry *entry = index->fetch (i);
vals->append (entry->val);
}
return vals;
}
template <typename Key_t, typename Value_t>
Vector<Key_t> *
DefaultMap<Key_t, Value_t>::keySet ()
{
Vector<Key_t> *keys = new Vector<Key_t>(entries);
for (int i = 0; i < entries; ++i)
{
Entry *entry = index->fetch (i);
keys->append (entry->key);
}
return keys;
}
#endif
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