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src/share/vm/prims/jniFastGetField.hpp@fd07a7e4222b (annotated)

src/share/vm/prims/jniFastGetField.hpp

Mon, 03 Feb 2014 15:24:20 +0100

author

sla

date

Mon, 03 Feb 2014 15:24:20 +0100

changeset 6327

fd07a7e4222b

parent 2314

f95d63e2154a

child 6876

710a3c8b516e

permissions

-rw-r--r--

8033126: Can't call default methods from JNI
Reviewed-by: dholmes, acorn, kamg

duke@435	1	/*
stefank@2314	2	* Copyright (c) 2004, 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
stefank@2314	25	#ifndef SHARE_VM_PRIMS_JNIFASTGETFIELD_HPP
stefank@2314	26	#define SHARE_VM_PRIMS_JNIFASTGETFIELD_HPP
stefank@2314	27
stefank@2314	28	#include "memory/allocation.hpp"
stefank@2314	29	#include "prims/jvm_misc.hpp"
stefank@2314	30
duke@435	31	// Basic logic of a fast version of jni_Get<Primitive>Field:
duke@435	32	//
duke@435	33	// (See safepoint.hpp for a description of _safepoint_counter)
duke@435	34	//
duke@435	35	// load _safepoint_counter into old_counter
duke@435	36	// IF old_counter is odd THEN
duke@435	37	// a safepoint is going on, return jni_GetXXXField
duke@435	38	// ELSE
duke@435	39	// load the primitive field value into result (speculatively)
duke@435	40	// load _safepoint_counter into new_counter
duke@435	41	// IF (old_counter == new_counter) THEN
duke@435	42	// no safepoint happened during the field access, return result
duke@435	43	// ELSE
duke@435	44	// a safepoint might have happened in-between, return jni_GetXXXField()
duke@435	45	// ENDIF
duke@435	46	// ENDIF
duke@435	47	//
duke@435	48	// LoadLoad membars to maintain the load order may be necessary
duke@435	49	// for some platforms.
duke@435	50	//
duke@435	51	// The fast versions don't check for pending suspension request.
duke@435	52	// This is fine since it's totally read-only and doesn't create new race.
duke@435	53	//
duke@435	54	// There is a hypothetical safepoint counter wraparound. But it's not
duke@435	55	// a practical concern.
duke@435	56
duke@435	57	class JNI_FastGetField : AllStatic {
duke@435	58	private:
duke@435	59	enum { LIST_CAPACITY = 40 }; // a conservative number for the number of
duke@435	60	// speculative loads on all the platforms
duke@435	61	static address speculative_load_pclist [];
duke@435	62	static address slowcase_entry_pclist [];
duke@435	63	static int count;
duke@435	64
duke@435	65	static address generate_fast_get_int_field0(BasicType type);
duke@435	66	static address generate_fast_get_float_field0(BasicType type);
duke@435	67
duke@435	68	public:
duke@435	69	#if defined(_WINDOWS) && !defined(_WIN64)
duke@435	70	static GetBooleanField_t jni_fast_GetBooleanField_fp;
duke@435	71	static GetByteField_t jni_fast_GetByteField_fp;
duke@435	72	static GetCharField_t jni_fast_GetCharField_fp;
duke@435	73	static GetShortField_t jni_fast_GetShortField_fp;
duke@435	74	static GetIntField_t jni_fast_GetIntField_fp;
duke@435	75	static GetLongField_t jni_fast_GetLongField_fp;
duke@435	76	static GetFloatField_t jni_fast_GetFloatField_fp;
duke@435	77	static GetDoubleField_t jni_fast_GetDoubleField_fp;
duke@435	78	#endif
duke@435	79
duke@435	80	static address generate_fast_get_boolean_field();
duke@435	81	static address generate_fast_get_byte_field();
duke@435	82	static address generate_fast_get_char_field();
duke@435	83	static address generate_fast_get_short_field();
duke@435	84	static address generate_fast_get_int_field();
duke@435	85	static address generate_fast_get_long_field();
duke@435	86	static address generate_fast_get_float_field();
duke@435	87	static address generate_fast_get_double_field();
duke@435	88
duke@435	89	// If pc is in speculative_load_pclist, return the corresponding
duke@435	90	// slow case entry pc. Otherwise, return -1.
duke@435	91	// This is used by signal/exception handler to handle such case:
duke@435	92	// After an even safepoint counter is loaded and a fast field access
duke@435	93	// is about to begin, a GC kicks in and shrinks the heap. Then the
duke@435	94	// field access may fault. The signal/exception handler needs to
duke@435	95	// return to the slow case.
duke@435	96	//
duke@435	97	// The GC may decide to temporarily stuff some bad values into handles,
duke@435	98	// for example, for debugging purpose, in which case we need the mapping also.
duke@435	99	static address find_slowcase_pc(address pc);
duke@435	100	};
stefank@2314	101
stefank@2314	102	#endif // SHARE_VM_PRIMS_JNIFASTGETFIELD_HPP