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src/share/vm/code/icBuffer.hpp@148e5441d916 (annotated)

src/share/vm/code/icBuffer.hpp

Tue, 15 Sep 2009 21:53:47 -0700

author

jrose

date

Tue, 15 Sep 2009 21:53:47 -0700

changeset 1424

148e5441d916

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6863023: need non-perm oops in code cache for JSR 292
Summary: Make a special root-list for those few nmethods which might contain non-perm oops.
Reviewed-by: twisti, kvn, never, jmasa, ysr

duke@435	1	/*
duke@435	2	* Copyright 1997-2003 Sun Microsystems, Inc. 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	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	//
duke@435	26	// For CompiledIC's:
duke@435	27	//
duke@435	28	// In cases where we do not have MT-safe state transformation,
duke@435	29	// we go to a transition state, using ICStubs. At a safepoint,
duke@435	30	// the inline caches are transferred from the transitional code:
duke@435	31	//
duke@435	32	// instruction_address --> 01 set xxx_oop, Ginline_cache_klass
duke@435	33	// 23 jump_to Gtemp, yyyy
duke@435	34	// 4 nop
duke@435	35
duke@435	36	class ICStub: public Stub {
duke@435	37	private:
duke@435	38	int _size; // total size of the stub incl. code
duke@435	39	address _ic_site; // points at call instruction of owning ic-buffer
duke@435	40	/* stub code follows here */
duke@435	41	protected:
duke@435	42	friend class ICStubInterface;
duke@435	43	// This will be called only by ICStubInterface
duke@435	44	void initialize(int size) { _size = size; _ic_site = NULL; }
duke@435	45	void finalize(); // called when a method is removed
duke@435	46
duke@435	47	// General info
duke@435	48	int size() const { return _size; }
duke@435	49	static int code_size_to_size(int code_size) { return round_to(sizeof(ICStub), CodeEntryAlignment) + code_size; }
duke@435	50
duke@435	51	public:
duke@435	52	// Creation
duke@435	53	void set_stub(CompiledIC *ic, oop cached_value, address dest_addr);
duke@435	54
duke@435	55	// Code info
duke@435	56	address code_begin() const { return (address)this + round_to(sizeof(ICStub), CodeEntryAlignment); }
duke@435	57	address code_end() const { return (address)this + size(); }
duke@435	58
duke@435	59	// Call site info
duke@435	60	address ic_site() const { return _ic_site; }
duke@435	61	void clear();
duke@435	62	bool is_empty() const { return _ic_site == NULL; }
duke@435	63
duke@435	64	// stub info
duke@435	65	address destination() const; // destination of jump instruction
duke@435	66	oop cached_oop() const; // cached_oop for stub
duke@435	67
duke@435	68	// Debugging
duke@435	69	void verify() PRODUCT_RETURN;
duke@435	70	void print() PRODUCT_RETURN;
duke@435	71
duke@435	72	// Creation
duke@435	73	friend ICStub* ICStub_from_destination_address(address destination_address);
duke@435	74	};
duke@435	75
duke@435	76	// ICStub Creation
duke@435	77	inline ICStub* ICStub_from_destination_address(address destination_address) {
duke@435	78	ICStub* stub = (ICStub*) (destination_address - round_to(sizeof(ICStub), CodeEntryAlignment));
duke@435	79	#ifdef ASSERT
duke@435	80	stub->verify();
duke@435	81	#endif
duke@435	82	return stub;
duke@435	83	}
duke@435	84
duke@435	85	class InlineCacheBuffer: public AllStatic {
duke@435	86	private:
duke@435	87	// friends
duke@435	88	friend class ICStub;
duke@435	89
duke@435	90	static int ic_stub_code_size();
duke@435	91
duke@435	92	static StubQueue* _buffer;
duke@435	93	static ICStub* _next_stub;
duke@435	94
duke@435	95	static StubQueue* buffer() { return _buffer; }
duke@435	96	static void set_next_stub(ICStub* next_stub) { _next_stub = next_stub; }
duke@435	97	static ICStub* get_next_stub() { return _next_stub; }
duke@435	98
duke@435	99	static void init_next_stub();
duke@435	100
duke@435	101	static ICStub* new_ic_stub();
duke@435	102
duke@435	103
duke@435	104	// Machine-dependent implementation of ICBuffer
duke@435	105	static void assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point);
duke@435	106	static address ic_buffer_entry_point (address code_begin);
duke@435	107	static oop ic_buffer_cached_oop (address code_begin);
duke@435	108
duke@435	109	public:
duke@435	110
duke@435	111	// Initialization; must be called before first usage
duke@435	112	static void initialize();
duke@435	113
duke@435	114	// Access
duke@435	115	static bool contains(address instruction_address);
duke@435	116
duke@435	117	// removes the ICStubs after backpatching
duke@435	118	static void update_inline_caches();
duke@435	119
duke@435	120	// for debugging
duke@435	121	static bool is_empty();
duke@435	122
duke@435	123
duke@435	124	// New interface
duke@435	125	static void create_transition_stub(CompiledIC *ic, oop cached_oop, address entry);
duke@435	126	static address ic_destination_for(CompiledIC *ic);
duke@435	127	static oop cached_oop_for(CompiledIC *ic);
duke@435	128	};