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src/share/vm/code/icBuffer.hpp@da91efe96a93 (annotated)

src/share/vm/code/icBuffer.hpp

Sat, 01 Sep 2012 13:25:18 -0400

author

coleenp

date

Sat, 01 Sep 2012 13:25:18 -0400

changeset 4037

da91efe96a93

parent 2314

f95d63e2154a

child 4107

b31471cdc53e

permissions

-rw-r--r--

6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

duke@435	1	/*
coleenp@4037	2	* Copyright (c) 1997, 2012, 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
stefank@2314	25	#ifndef SHARE_VM_CODE_ICBUFFER_HPP
stefank@2314	26	#define SHARE_VM_CODE_ICBUFFER_HPP
stefank@2314	27
stefank@2314	28	#include "code/stubs.hpp"
stefank@2314	29	#include "interpreter/bytecodes.hpp"
stefank@2314	30	#include "memory/allocation.hpp"
stefank@2314	31
duke@435	32	//
duke@435	33	// For CompiledIC's:
duke@435	34	//
duke@435	35	// In cases where we do not have MT-safe state transformation,
duke@435	36	// we go to a transition state, using ICStubs. At a safepoint,
duke@435	37	// the inline caches are transferred from the transitional code:
duke@435	38	//
duke@435	39	// instruction_address --> 01 set xxx_oop, Ginline_cache_klass
duke@435	40	// 23 jump_to Gtemp, yyyy
duke@435	41	// 4 nop
duke@435	42
duke@435	43	class ICStub: public Stub {
duke@435	44	private:
duke@435	45	int _size; // total size of the stub incl. code
duke@435	46	address _ic_site; // points at call instruction of owning ic-buffer
duke@435	47	/* stub code follows here */
duke@435	48	protected:
duke@435	49	friend class ICStubInterface;
duke@435	50	// This will be called only by ICStubInterface
duke@435	51	void initialize(int size) { _size = size; _ic_site = NULL; }
duke@435	52	void finalize(); // called when a method is removed
duke@435	53
duke@435	54	// General info
duke@435	55	int size() const { return _size; }
duke@435	56	static int code_size_to_size(int code_size) { return round_to(sizeof(ICStub), CodeEntryAlignment) + code_size; }
duke@435	57
duke@435	58	public:
duke@435	59	// Creation
coleenp@4037	60	void set_stub(CompiledIC *ic, void* cached_value, address dest_addr);
duke@435	61
duke@435	62	// Code info
duke@435	63	address code_begin() const { return (address)this + round_to(sizeof(ICStub), CodeEntryAlignment); }
duke@435	64	address code_end() const { return (address)this + size(); }
duke@435	65
duke@435	66	// Call site info
duke@435	67	address ic_site() const { return _ic_site; }
duke@435	68	void clear();
duke@435	69	bool is_empty() const { return _ic_site == NULL; }
duke@435	70
duke@435	71	// stub info
duke@435	72	address destination() const; // destination of jump instruction
coleenp@4037	73	void* cached_value() const; // cached_value for stub
duke@435	74
duke@435	75	// Debugging
duke@435	76	void verify() PRODUCT_RETURN;
duke@435	77	void print() PRODUCT_RETURN;
duke@435	78
duke@435	79	// Creation
duke@435	80	friend ICStub* ICStub_from_destination_address(address destination_address);
duke@435	81	};
duke@435	82
duke@435	83	// ICStub Creation
duke@435	84	inline ICStub* ICStub_from_destination_address(address destination_address) {
duke@435	85	ICStub* stub = (ICStub*) (destination_address - round_to(sizeof(ICStub), CodeEntryAlignment));
duke@435	86	#ifdef ASSERT
duke@435	87	stub->verify();
duke@435	88	#endif
duke@435	89	return stub;
duke@435	90	}
duke@435	91
duke@435	92	class InlineCacheBuffer: public AllStatic {
duke@435	93	private:
duke@435	94	// friends
duke@435	95	friend class ICStub;
duke@435	96
duke@435	97	static int ic_stub_code_size();
duke@435	98
duke@435	99	static StubQueue* _buffer;
duke@435	100	static ICStub* _next_stub;
duke@435	101
coleenp@4037	102	static CompiledICHolder* _pending_released;
coleenp@4037	103	static int _pending_count;
coleenp@4037	104
duke@435	105	static StubQueue* buffer() { return _buffer; }
duke@435	106	static void set_next_stub(ICStub* next_stub) { _next_stub = next_stub; }
duke@435	107	static ICStub* get_next_stub() { return _next_stub; }
duke@435	108
duke@435	109	static void init_next_stub();
duke@435	110
duke@435	111	static ICStub* new_ic_stub();
duke@435	112
duke@435	113
duke@435	114	// Machine-dependent implementation of ICBuffer
coleenp@4037	115	static void assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point);
duke@435	116	static address ic_buffer_entry_point (address code_begin);
coleenp@4037	117	static void* ic_buffer_cached_value (address code_begin);
duke@435	118
duke@435	119	public:
duke@435	120
duke@435	121	// Initialization; must be called before first usage
duke@435	122	static void initialize();
duke@435	123
duke@435	124	// Access
duke@435	125	static bool contains(address instruction_address);
duke@435	126
duke@435	127	// removes the ICStubs after backpatching
duke@435	128	static void update_inline_caches();
duke@435	129
duke@435	130	// for debugging
duke@435	131	static bool is_empty();
duke@435	132
coleenp@4037	133	static void release_pending_icholders();
coleenp@4037	134	static void queue_for_release(CompiledICHolder* icholder);
coleenp@4037	135	static int pending_icholder_count() { return _pending_count; }
duke@435	136
duke@435	137	// New interface
coleenp@4037	138	static void create_transition_stub(CompiledIC *ic, void* cached_value, address entry);
duke@435	139	static address ic_destination_for(CompiledIC *ic);
coleenp@4037	140	static void* cached_value_for(CompiledIC *ic);
duke@435	141	};
stefank@2314	142
stefank@2314	143	#endif // SHARE_VM_CODE_ICBUFFER_HPP