| /* |
| * Copyright 1998-2005 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. |
| * |
| */ |
| |
| // The Rewriter adds caches to the constant pool and rewrites bytecode indices |
| // pointing into the constant pool for better interpreter performance. |
| |
| class Rewriter: public StackObj { |
| private: |
| instanceKlassHandle _klass; |
| constantPoolHandle _pool; |
| objArrayHandle _methods; |
| intArray _cp_map; |
| intStack _cp_cache_map; |
| |
| void init_cp_map(int length) { |
| _cp_map.initialize(length, -1); |
| // Choose an initial value large enough that we don't get frequent |
| // calls to grow(). |
| _cp_cache_map.initialize(length / 2); |
| } |
| int cp_entry_to_cp_cache(int i) { assert(has_cp_cache(i), "oob"); return _cp_map[i]; } |
| bool has_cp_cache(int i) { return (uint)i < (uint)_cp_map.length() && _cp_map[i] >= 0; } |
| int maybe_add_cp_cache_entry(int i) { return has_cp_cache(i) ? _cp_map[i] : add_cp_cache_entry(i); } |
| int add_cp_cache_entry(int cp_index) { |
| assert(_cp_map[cp_index] == -1, "not twice on same cp_index"); |
| int cache_index = _cp_cache_map.append(cp_index); |
| _cp_map.at_put(cp_index, cache_index); |
| assert(cp_entry_to_cp_cache(cp_index) == cache_index, ""); |
| return cache_index; |
| } |
| int add_extra_cp_cache_entry(int main_entry); |
| |
| // All the work goes in here: |
| Rewriter(instanceKlassHandle klass, TRAPS); |
| |
| void compute_index_maps(); |
| void make_constant_pool_cache(TRAPS); |
| void scan_method(methodOop m); |
| methodHandle rewrite_jsrs(methodHandle m, TRAPS); |
| void rewrite_Object_init(methodHandle m, TRAPS); |
| int rewrite_member_reference(address bcp, int offset); |
| void rewrite_invokedynamic(address bcp, int offset, int cp_index); |
| |
| public: |
| // Driver routine: |
| static void rewrite(instanceKlassHandle klass, TRAPS); |
| }; |