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src/cpu/sparc/vm/registerMap_sparc.hpp@e1162778c1c8 (annotated)

src/cpu/sparc/vm/registerMap_sparc.hpp

Thu, 07 Apr 2011 09:53:20 -0700

author

johnc

date

Thu, 07 Apr 2011 09:53:20 -0700

changeset 2781

e1162778c1c8

parent 2314

f95d63e2154a

child 2950

cba7b5c2d53f

permissions

-rw-r--r--

7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes

duke@435	1	/*
stefank@2314	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
stefank@2314	25	#ifndef CPU_SPARC_VM_REGISTERMAP_SPARC_HPP
stefank@2314	26	#define CPU_SPARC_VM_REGISTERMAP_SPARC_HPP
stefank@2314	27
duke@435	28	// machine-dependent implemention for register maps
duke@435	29	friend class frame;
duke@435	30
duke@435	31	private:
duke@435	32	intptr_t* _window; // register window save area (for L and I regs)
duke@435	33	intptr_t* _younger_window; // previous save area (for O regs, if needed)
duke@435	34
duke@435	35	address pd_location(VMReg reg) const;
duke@435	36	void pd_clear();
duke@435	37	void pd_initialize_from(const RegisterMap* map) {
duke@435	38	_window = map->_window;
duke@435	39	_younger_window = map->_younger_window;
duke@435	40	_location_valid[0] = 0; // avoid the shift_individual_registers game
duke@435	41	}
duke@435	42	void pd_initialize() {
duke@435	43	_window = NULL;
duke@435	44	_younger_window = NULL;
duke@435	45	_location_valid[0] = 0; // avoid the shift_individual_registers game
duke@435	46	}
duke@435	47	void shift_window(intptr_t* sp, intptr_t* younger_sp) {
duke@435	48	_window = sp;
duke@435	49	_younger_window = younger_sp;
duke@435	50	// Throw away locations for %i, %o, and %l registers:
duke@435	51	// But do not throw away %g register locs.
duke@435	52	if (_location_valid[0] != 0) shift_individual_registers();
duke@435	53	}
duke@435	54	void shift_individual_registers();
duke@435	55	// When popping out of compiled frames, we make all IRegs disappear.
duke@435	56	void make_integer_regs_unsaved() { _location_valid[0] = 0; }
stefank@2314	57
stefank@2314	58	#endif // CPU_SPARC_VM_REGISTERMAP_SPARC_HPP