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src/share/vm/interpreter/rewriter.hpp@136b78722a08 (annotated)

src/share/vm/interpreter/rewriter.hpp

Wed, 09 Jun 2010 18:50:45 -0700

author

jrose

date

Wed, 09 Jun 2010 18:50:45 -0700

changeset 1957

136b78722a08

parent 1934

e9ff18c4ace7

child 2015

083fde3b838e

permissions

-rw-r--r--

6939203: JSR 292 needs method handle constants
Summary: Add new CP types CONSTANT_MethodHandle, CONSTANT_MethodType; extend 'ldc' bytecode.
Reviewed-by: twisti, never

duke@435	1	/*
jrose@1934	2	* Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// The Rewriter adds caches to the constant pool and rewrites bytecode indices
duke@435	26	// pointing into the constant pool for better interpreter performance.
duke@435	27
jrose@1161	28	class Rewriter: public StackObj {
duke@435	29	private:
jrose@1161	30	instanceKlassHandle _klass;
jrose@1161	31	constantPoolHandle _pool;
jrose@1161	32	objArrayHandle _methods;
jrose@1161	33	intArray _cp_map;
jrose@1161	34	intStack _cp_cache_map;
jrose@1161	35
jrose@1161	36	void init_cp_map(int length) {
jrose@1161	37	_cp_map.initialize(length, -1);
jrose@1161	38	// Choose an initial value large enough that we don't get frequent
jrose@1161	39	// calls to grow().
jrose@1161	40	_cp_cache_map.initialize(length / 2);
jrose@1161	41	}
jrose@1161	42	int cp_entry_to_cp_cache(int i) { assert(has_cp_cache(i), "oob"); return _cp_map[i]; }
jrose@1161	43	bool has_cp_cache(int i) { return (uint)i < (uint)_cp_map.length() && _cp_map[i] >= 0; }
jrose@1161	44	int maybe_add_cp_cache_entry(int i) { return has_cp_cache(i) ? _cp_map[i] : add_cp_cache_entry(i); }
jrose@1161	45	int add_cp_cache_entry(int cp_index) {
jrose@1494	46	assert((cp_index & _secondary_entry_tag) == 0, "bad tag");
jrose@1161	47	assert(_cp_map[cp_index] == -1, "not twice on same cp_index");
jrose@1161	48	int cache_index = _cp_cache_map.append(cp_index);
jrose@1161	49	_cp_map.at_put(cp_index, cache_index);
jrose@1161	50	assert(cp_entry_to_cp_cache(cp_index) == cache_index, "");
jrose@1161	51	return cache_index;
jrose@1161	52	}
jrose@1494	53	int add_secondary_cp_cache_entry(int main_cpc_entry) {
jrose@1494	54	assert(main_cpc_entry < _cp_cache_map.length(), "must be earlier CP cache entry");
jrose@1494	55	int cache_index = _cp_cache_map.append(main_cpc_entry | _secondary_entry_tag);
jrose@1494	56	return cache_index;
jrose@1494	57	}
jrose@1161	58
jrose@1161	59	// All the work goes in here:
twisti@1573	60	Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS);
jrose@1161	61
jrose@1161	62	void compute_index_maps();
jrose@1161	63	void make_constant_pool_cache(TRAPS);
jrose@1161	64	void scan_method(methodOop m);
jrose@1161	65	methodHandle rewrite_jsrs(methodHandle m, TRAPS);
jrose@1161	66	void rewrite_Object_init(methodHandle m, TRAPS);
jrose@1920	67	void rewrite_member_reference(address bcp, int offset);
jrose@1920	68	void rewrite_invokedynamic(address bcp, int offset);
jrose@1957	69	void maybe_rewrite_ldc(address bcp, int offset, bool is_wide);
duke@435	70
duke@435	71	public:
jrose@1161	72	// Driver routine:
duke@435	73	static void rewrite(instanceKlassHandle klass, TRAPS);
twisti@1573	74	static void rewrite(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS);
jrose@1494	75
jrose@1494	76	enum {
jrose@1494	77	_secondary_entry_tag = nth_bit(30)
jrose@1494	78	};
duke@435	79	};