Mercurial > hg > truffle
diff src/share/vm/ci/ciConstantPoolCache.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/ci/ciConstantPoolCache.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,101 @@ +/* + * Copyright 1999 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code 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 + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +#include "incls/_precompiled.incl" +#include "incls/_ciConstantPoolCache.cpp.incl" + +// ciConstantPoolCache +// +// This class caches indexed constant pool lookups. + +// ------------------------------------------------------------------ +// ciConstantPoolCache::ciConstantPoolCache +ciConstantPoolCache::ciConstantPoolCache(Arena* arena, + int expected_size) { + _elements = + new (arena) GrowableArray<void*>(arena, expected_size, 0, 0); + _keys = new (arena) GrowableArray<intptr_t>(arena, expected_size, 0, 0); +} + +// ------------------------------------------------------------------ +// ciConstantPoolCache::get +// +// Get the entry at some index +void* ciConstantPoolCache::get(int index) { + ASSERT_IN_VM; + int pos = find(index); + if (pos >= _keys->length() || + _keys->at(pos) != index) { + // This element is not present in the cache. + return NULL; + } + return _elements->at(pos); +} + +// ------------------------------------------------------------------ +// ciConstantPoolCache::find +// +// Use binary search to find the position of this index in the cache. +// If there is no entry in the cache corresponding to this oop, return +// the position at which the index would be inserted. +int ciConstantPoolCache::find(int key) { + int min = 0; + int max = _keys->length()-1; + + while (max >= min) { + int mid = (max + min) / 2; + int value = _keys->at(mid); + if (value < key) { + min = mid + 1; + } else if (value > key) { + max = mid - 1; + } else { + return mid; + } + } + return min; +} + +// ------------------------------------------------------------------ +// ciConstantPoolCache::insert +// +// Insert a ciObject into the table at some index. +void ciConstantPoolCache::insert(int index, void* elem) { + int i; + int pos = find(index); + for (i = _keys->length()-1; i >= pos; i--) { + _keys->at_put_grow(i+1, _keys->at(i)); + _elements->at_put_grow(i+1, _elements->at(i)); + } + _keys->at_put_grow(pos, index); + _elements->at_put_grow(pos, elem); +} + +// ------------------------------------------------------------------ +// ciConstantPoolCache::print +// +// Print debugging information about the cache. +void ciConstantPoolCache::print() { + Unimplemented(); +}