Mercurial > hg > truffle
view src/share/vm/interpreter/rewriter.hpp @ 7535:f057113c7a87
provide TargetDescription in LoweringTool
author | Lukas Stadler <lukas.stadler@jku.at> |
---|---|
date | Wed, 23 Jan 2013 16:46:20 +0100 |
parents | cc6a617fffd2 |
children | 41cb10cbfb3c |
line wrap: on
line source
/* * Copyright (c) 1998, 2012, 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; Array<Method*>* _methods; intArray _cp_map; intStack _cp_cache_map; // for Methodref, Fieldref, // InterfaceMethodref and InvokeDynamic intArray _reference_map; // maps from cp index to resolved_refs index (or -1) intStack _resolved_references_map; // for strings, methodHandle, methodType intStack _invokedynamic_references_map; // for invokedynamic resolved refs intArray _method_handle_invokers; int _resolved_reference_limit; void init_maps(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); // Also cache resolved objects, in another different cache. _reference_map.initialize(length, -1); _resolved_references_map.initialize(length / 2); _invokedynamic_references_map.initialize(length / 2); _resolved_reference_limit = -1; DEBUG_ONLY(_cp_cache_index_limit = -1); } int _cp_cache_index_limit; void record_map_limits() { #ifdef ASSERT // Record initial size of the two arrays generated for the CP cache: _cp_cache_index_limit = _cp_cache_map.length(); #endif //ASSERT _resolved_reference_limit = _resolved_references_map.length(); } 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 add_cp_cache_entry(int cp_index) { assert(_pool->tag_at(cp_index).value() != JVM_CONSTANT_InvokeDynamic, "use indy version"); assert(_cp_map[cp_index] == -1, "not twice on same cp_index"); assert(_cp_cache_index_limit == -1, "do not add cache entries after first iteration"); 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, ""); assert(cp_cache_entry_pool_index(cache_index) == cp_index, ""); return cache_index; } // add a new CP cache entry beyond the normal cache (for invokedynamic only) int add_invokedynamic_cp_cache_entry(int cp_index) { assert(_pool->tag_at(cp_index).value() == JVM_CONSTANT_InvokeDynamic, "use non-indy version"); assert(_cp_map[cp_index] == -1, "do not map from cp_index"); assert(_cp_cache_index_limit >= 0, "add indy cache entries after first iteration"); int cache_index = _cp_cache_map.append(cp_index); assert(cache_index >= _cp_cache_index_limit, ""); // do not update _cp_map, since the mapping is one-to-many assert(cp_cache_entry_pool_index(cache_index) == cp_index, ""); return cache_index; } // fix duplicated code later int cp_entry_to_resolved_references(int cp_index) const { assert(has_entry_in_resolved_references(cp_index), "oob"); return _reference_map[cp_index]; } bool has_entry_in_resolved_references(int cp_index) const { return (uint)cp_index < (uint)_reference_map.length() && _reference_map[cp_index] >= 0; } // add a new entry to the resolved_references map int add_resolved_references_entry(int cp_index) { assert(_reference_map[cp_index] == -1, "not twice on same cp_index"); assert(_resolved_reference_limit == -1, "do not add CP refs after first iteration"); int ref_index = _resolved_references_map.append(cp_index); _reference_map.at_put(cp_index, ref_index); assert(cp_entry_to_resolved_references(cp_index) == ref_index, ""); return ref_index; } // add a new entries to the resolved_references map (for invokedynamic and invokehandle only) int add_invokedynamic_resolved_references_entries(int cp_index, int cache_index) { assert(_resolved_reference_limit >= 0, "must add indy refs after first iteration"); int ref_index = -1; for (int entry = 0; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) { const int index = _resolved_references_map.append(cp_index); // many-to-one assert(index >= _resolved_reference_limit, ""); if (entry == 0) { ref_index = index; } assert((index - entry) == ref_index, "entries must be consecutive"); _invokedynamic_references_map.at_put_grow(index, cache_index, -1); } return ref_index; } int resolved_references_entry_to_pool_index(int ref_index) { int cp_index = _resolved_references_map[ref_index]; return cp_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]; return cp_index; } // All the work goes in here: Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, Array<Method*>* methods, TRAPS); void compute_index_maps(); void make_constant_pool_cache(TRAPS); void scan_method(Method* m, bool reverse = false); void rewrite_Object_init(methodHandle m, TRAPS); void rewrite_member_reference(address bcp, int offset, bool reverse = false); void maybe_rewrite_invokehandle(address opc, int cp_index, int cache_index, 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); }; #endif // SHARE_VM_INTERPRETER_REWRITER_HPP