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

src/cpu/sparc/vm/stubRoutines_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	/*
trims@1907	2	* Copyright (c) 1997, 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_STUBROUTINES_SPARC_HPP
stefank@2314	26	#define CPU_SPARC_VM_STUBROUTINES_SPARC_HPP
stefank@2314	27
duke@435	28	// This file holds the platform specific parts of the StubRoutines
duke@435	29	// definition. See stubRoutines.hpp for a description on how to
duke@435	30	// extend it.
duke@435	31
duke@435	32
duke@435	33	// So unfortunately c2 will call with a pc from a frame object
duke@435	34	// (already adjusted) and a raw pc (unadjusted), so we need to check both.
duke@435	35	// It didn't use to be like this before adapter removal.
duke@435	36	static bool returns_to_call_stub(address return_pc) {
duke@435	37	return ((return_pc + frame::pc_return_offset) == _call_stub_return_address) ||
duke@435	38	(return_pc == _call_stub_return_address );
duke@435	39	}
duke@435	40
duke@435	41	enum /* platform_dependent_constants */ {
duke@435	42	// %%%%%%%% May be able to shrink this a lot
twisti@1734	43	code_size1 = 20000, // simply increase if too small (assembler will crash if too small)
twisti@1734	44	code_size2 = 20000 // simply increase if too small (assembler will crash if too small)
twisti@1734	45	};
twisti@1734	46
twisti@1734	47	// MethodHandles adapters
twisti@1734	48	enum method_handles_platform_dependent_constants {
twisti@2201	49	method_handles_adapters_code_size = 15000
duke@435	50	};
duke@435	51
duke@435	52	class Sparc {
duke@435	53	friend class StubGenerator;
duke@435	54
duke@435	55	public:
duke@435	56	enum { nof_instance_allocators = 10 };
duke@435	57
duke@435	58	// allocator lock values
duke@435	59	enum {
duke@435	60	unlocked = 0,
duke@435	61	locked = 1
duke@435	62	};
duke@435	63
duke@435	64	enum {
duke@435	65	v8_oop_lock_ignore_bits = 2,
duke@435	66	v8_oop_lock_bits = 4,
duke@435	67	nof_v8_oop_lock_cache_entries = 1 << (v8_oop_lock_bits+v8_oop_lock_ignore_bits),
duke@435	68	v8_oop_lock_mask = right_n_bits(v8_oop_lock_bits),
duke@435	69	v8_oop_lock_mask_in_place = v8_oop_lock_mask << v8_oop_lock_ignore_bits
duke@435	70	};
duke@435	71
duke@435	72	static int _v8_oop_lock_cache[nof_v8_oop_lock_cache_entries];
duke@435	73
duke@435	74	private:
duke@435	75	static address _test_stop_entry;
duke@435	76	static address _stop_subroutine_entry;
duke@435	77	static address _flush_callers_register_windows_entry;
duke@435	78
duke@435	79	static int _atomic_memory_operation_lock;
duke@435	80
duke@435	81	static address _partial_subtype_check;
duke@435	82
duke@435	83	public:
duke@435	84	// %%% global lock for everyone who needs to use atomic_compare_and_exchange
duke@435	85	// %%% or atomic_increment -- should probably use more locks for more
duke@435	86	// %%% scalability-- for instance one for each eden space or group of
duke@435	87
duke@435	88	// address of the lock for atomic_compare_and_exchange
duke@435	89	static int* atomic_memory_operation_lock_addr() { return &_atomic_memory_operation_lock; }
duke@435	90
duke@435	91	// accessor and mutator for _atomic_memory_operation_lock
duke@435	92	static int atomic_memory_operation_lock() { return _atomic_memory_operation_lock; }
duke@435	93	static void set_atomic_memory_operation_lock(int value) { _atomic_memory_operation_lock = value; }
duke@435	94
duke@435	95	// test assembler stop routine by setting registers
duke@435	96	static void (*test_stop_entry()) () { return CAST_TO_FN_PTR(void (*)(void), _test_stop_entry); }
duke@435	97
duke@435	98	// a subroutine for debugging assembler code
duke@435	99	static address stop_subroutine_entry_address() { return (address)&_stop_subroutine_entry; }
duke@435	100
duke@435	101	// flushes (all but current) register window
duke@435	102	static intptr_t* (*flush_callers_register_windows_func())() { return CAST_TO_FN_PTR(intptr_t* (*)(void), _flush_callers_register_windows_entry); }
duke@435	103
duke@435	104	static address partial_subtype_check() { return _partial_subtype_check; }
duke@435	105	};
stefank@2314	106
stefank@2314	107	#endif // CPU_SPARC_VM_STUBROUTINES_SPARC_HPP