Mercurial > hg > truffle
view src/share/vm/interpreter/rewriter.hpp @ 4898:d851f3714641
Merge
author | dholmes |
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date | Wed, 25 Jan 2012 19:26:35 -0500 |
parents | d3b9f2be46ab |
children | 1d7922586cf6 |
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/* * Copyright (c) 1998, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_INTERPRETER_REWRITER_HPP #define SHARE_VM_INTERPRETER_REWRITER_HPP #include "memory/allocation.hpp" #include "runtime/handles.inline.hpp" #include "utilities/growableArray.hpp" // 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; bool _have_invoke_dynamic; 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_index & _secondary_entry_tag) == 0, "bad tag"); 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_secondary_cp_cache_entry(int main_cpc_entry) { assert(main_cpc_entry < _cp_cache_map.length(), "must be earlier CP cache entry"); int cache_index = _cp_cache_map.append(main_cpc_entry | _secondary_entry_tag); return cache_index; } // Access the contents of _cp_cache_map to determine CP cache layout. int cp_cache_entry_pool_index(int cache_index) { int cp_index = _cp_cache_map[cache_index]; if ((cp_index & _secondary_entry_tag) != 0) return -1; else return cp_index; } int cp_cache_secondary_entry_main_index(int cache_index) { int cp_index = _cp_cache_map[cache_index]; if ((cp_index & _secondary_entry_tag) == 0) return -1; else return (cp_index - _secondary_entry_tag); } // All the work goes in here: Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS); void compute_index_maps(); void make_constant_pool_cache(TRAPS); void scan_method(methodOop m, bool reverse = false); void rewrite_Object_init(methodHandle m, TRAPS); void rewrite_member_reference(address bcp, int offset, bool reverse = false); void rewrite_invokedynamic(address bcp, int offset, bool reverse = false); void maybe_rewrite_ldc(address bcp, int offset, bool is_wide, bool reverse = false); // Revert bytecodes in case of an exception. void restore_bytecodes(); static methodHandle rewrite_jsrs(methodHandle m, TRAPS); public: // Driver routine: static void rewrite(instanceKlassHandle klass, TRAPS); static void rewrite(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS); enum { _secondary_entry_tag = nth_bit(30) }; // Second pass, not gated by is_rewritten flag static void relocate_and_link(instanceKlassHandle klass, TRAPS); // JSR292 version to call with it's own methods. static void relocate_and_link(instanceKlassHandle klass, objArrayHandle methods, TRAPS); }; #endif // SHARE_VM_INTERPRETER_REWRITER_HPP