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src/share/vm/code/icBuffer.hpp@ac27a9c85bea (annotated)

src/share/vm/code/icBuffer.hpp

Thu, 24 May 2018 18:41:44 +0800

author

aoqi

date

Thu, 24 May 2018 18:41:44 +0800

changeset 8856

ac27a9c85bea

parent 6876

710a3c8b516e

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_CODE_ICBUFFER_HPP
aoqi@0	26	#define SHARE_VM_CODE_ICBUFFER_HPP
aoqi@0	27
aoqi@0	28	#include "asm/codeBuffer.hpp"
aoqi@0	29	#include "code/stubs.hpp"
aoqi@0	30	#include "interpreter/bytecodes.hpp"
aoqi@0	31	#include "memory/allocation.hpp"
aoqi@0	32
aoqi@0	33	//
aoqi@0	34	// For CompiledIC's:
aoqi@0	35	//
aoqi@0	36	// In cases where we do not have MT-safe state transformation,
aoqi@0	37	// we go to a transition state, using ICStubs. At a safepoint,
aoqi@0	38	// the inline caches are transferred from the transitional code:
aoqi@0	39	//
aoqi@0	40	// instruction_address --> 01 set xxx_oop, Ginline_cache_klass
aoqi@0	41	// 23 jump_to Gtemp, yyyy
aoqi@0	42	// 4 nop
aoqi@0	43
aoqi@0	44	class ICStub: public Stub {
aoqi@0	45	private:
aoqi@0	46	int _size; // total size of the stub incl. code
aoqi@0	47	address _ic_site; // points at call instruction of owning ic-buffer
aoqi@0	48	/* stub code follows here */
aoqi@0	49	protected:
aoqi@0	50	friend class ICStubInterface;
aoqi@0	51	// This will be called only by ICStubInterface
aoqi@0	52	void initialize(int size,
aoqi@0	53	CodeStrings strings) { _size = size; _ic_site = NULL; }
aoqi@0	54	void finalize(); // called when a method is removed
aoqi@0	55
aoqi@0	56	// General info
aoqi@0	57	int size() const { return _size; }
aoqi@0	58	static int code_size_to_size(int code_size) { return round_to(sizeof(ICStub), CodeEntryAlignment) + code_size; }
aoqi@0	59
aoqi@0	60	public:
aoqi@0	61	// Creation
aoqi@0	62	void set_stub(CompiledIC *ic, void* cached_value, address dest_addr);
aoqi@0	63
aoqi@0	64	// Code info
aoqi@0	65	address code_begin() const { return (address)this + round_to(sizeof(ICStub), CodeEntryAlignment); }
aoqi@0	66	address code_end() const { return (address)this + size(); }
aoqi@0	67
aoqi@0	68	// Call site info
aoqi@0	69	address ic_site() const { return _ic_site; }
aoqi@0	70	void clear();
aoqi@0	71	bool is_empty() const { return _ic_site == NULL; }
aoqi@0	72
aoqi@0	73	// stub info
aoqi@0	74	address destination() const; // destination of jump instruction
aoqi@0	75	void* cached_value() const; // cached_value for stub
aoqi@0	76
aoqi@0	77	// Debugging
aoqi@0	78	void verify() PRODUCT_RETURN;
aoqi@0	79	void print() PRODUCT_RETURN;
aoqi@0	80
aoqi@0	81	// Creation
aoqi@0	82	friend ICStub* ICStub_from_destination_address(address destination_address);
aoqi@0	83	};
aoqi@0	84
aoqi@0	85	// ICStub Creation
aoqi@0	86	inline ICStub* ICStub_from_destination_address(address destination_address) {
aoqi@0	87	ICStub* stub = (ICStub*) (destination_address - round_to(sizeof(ICStub), CodeEntryAlignment));
aoqi@0	88	#ifdef ASSERT
aoqi@0	89	stub->verify();
aoqi@0	90	#endif
aoqi@0	91	return stub;
aoqi@0	92	}
aoqi@0	93
aoqi@0	94	class InlineCacheBuffer: public AllStatic {
aoqi@0	95	private:
aoqi@0	96	// friends
aoqi@0	97	friend class ICStub;
aoqi@0	98
aoqi@0	99	static int ic_stub_code_size();
aoqi@0	100
aoqi@0	101	static StubQueue* _buffer;
aoqi@0	102	static ICStub* _next_stub;
aoqi@0	103
aoqi@0	104	static CompiledICHolder* _pending_released;
aoqi@0	105	static int _pending_count;
aoqi@0	106
aoqi@0	107	static StubQueue* buffer() { return _buffer; }
aoqi@0	108	static void set_next_stub(ICStub* next_stub) { _next_stub = next_stub; }
aoqi@0	109	static ICStub* get_next_stub() { return _next_stub; }
aoqi@0	110
aoqi@0	111	static void init_next_stub();
aoqi@0	112
aoqi@0	113	static ICStub* new_ic_stub();
aoqi@0	114
aoqi@0	115
aoqi@0	116	// Machine-dependent implementation of ICBuffer
aoqi@0	117	static void assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point);
aoqi@0	118	static address ic_buffer_entry_point (address code_begin);
aoqi@0	119	static void* ic_buffer_cached_value (address code_begin);
aoqi@0	120
aoqi@0	121	public:
aoqi@0	122
aoqi@0	123	// Initialization; must be called before first usage
aoqi@0	124	static void initialize();
aoqi@0	125
aoqi@0	126	// Access
aoqi@0	127	static bool contains(address instruction_address);
aoqi@0	128
aoqi@0	129	// removes the ICStubs after backpatching
aoqi@0	130	static void update_inline_caches();
aoqi@0	131
aoqi@0	132	// for debugging
aoqi@0	133	static bool is_empty();
aoqi@0	134
aoqi@0	135	static void release_pending_icholders();
aoqi@0	136	static void queue_for_release(CompiledICHolder* icholder);
aoqi@0	137	static int pending_icholder_count() { return _pending_count; }
aoqi@0	138
aoqi@0	139	// New interface
aoqi@0	140	static void create_transition_stub(CompiledIC *ic, void* cached_value, address entry);
aoqi@0	141	static address ic_destination_for(CompiledIC *ic);
aoqi@0	142	static void* cached_value_for(CompiledIC *ic);
aoqi@0	143	};
aoqi@0	144
aoqi@0	145	#endif // SHARE_VM_CODE_ICBUFFER_HPP