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src/share/vm/runtime/javaFrameAnchor.hpp@7ae4e26cb1e0 (annotated)

src/share/vm/runtime/javaFrameAnchor.hpp

Thu, 12 Oct 2017 21:27:07 +0800

author

aoqi

date

Thu, 12 Oct 2017 21:27:07 +0800

changeset 7535

7ae4e26cb1e0

parent 6911

ce8f6bb717c9

parent 6876

710a3c8b516e

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2002, 2011, 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@1	25	/*
aoqi@1	26	* This file has been modified by Loongson Technology in 2015. These
aoqi@1	27	* modifications are Copyright (c) 2015 Loongson Technology, and are made
aoqi@1	28	* available on the same license terms set forth above.
aoqi@1	29	*/
aoqi@1	30
aoqi@0	31	#ifndef SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
aoqi@0	32	#define SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
aoqi@0	33
aoqi@0	34	#include "utilities/globalDefinitions.hpp"
goetz@6911	35	#include "runtime/orderAccess.inline.hpp"
aoqi@0	36
aoqi@0	37	//
aoqi@0	38	// An object for encapsulating the machine/os dependent part of a JavaThread frame state
aoqi@0	39	//
aoqi@0	40	class JavaThread;
aoqi@0	41
aoqi@0	42	class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {
aoqi@0	43	// Too many friends...
aoqi@0	44	friend class CallNativeDirectNode;
aoqi@0	45	friend class OptoRuntime;
aoqi@0	46	friend class Runtime1;
aoqi@0	47	friend class StubAssembler;
aoqi@0	48	friend class CallRuntimeDirectNode;
aoqi@0	49	friend class MacroAssembler;
aoqi@0	50	friend class InterpreterGenerator;
aoqi@0	51	friend class LIR_Assembler;
aoqi@0	52	friend class GraphKit;
aoqi@0	53	friend class StubGenerator;
aoqi@0	54	friend class JavaThread;
aoqi@0	55	friend class frame;
aoqi@0	56	friend class VMStructs;
aoqi@0	57	friend class BytecodeInterpreter;
aoqi@0	58	friend class JavaCallWrapper;
aoqi@0	59
aoqi@0	60	private:
aoqi@0	61	//
aoqi@0	62	// Whenever _last_Java_sp != NULL other anchor fields MUST be valid!
aoqi@0	63	// The stack may not be walkable [check with walkable() ] but the values must be valid.
aoqi@0	64	// The profiler apparently depends on this.
aoqi@0	65	//
aoqi@0	66	intptr_t* volatile _last_Java_sp;
aoqi@0	67
aoqi@0	68	// Whenever we call from Java to native we can not be assured that the return
aoqi@0	69	// address that composes the last_Java_frame will be in an accessible location
aoqi@0	70	// so calls from Java to native store that pc (or one good enough to locate
aoqi@0	71	// the oopmap) in the frame anchor. Since the frames that call from Java to
aoqi@0	72	// native are never deoptimized we never need to patch the pc and so this
aoqi@0	73	// is acceptable.
aoqi@0	74	volatile address _last_Java_pc;
aoqi@0	75
aoqi@0	76	// tells whether the last Java frame is set
aoqi@0	77	// It is important that when last_Java_sp != NULL that the rest of the frame
aoqi@0	78	// anchor (including platform specific) all be valid.
aoqi@0	79
aoqi@0	80	bool has_last_Java_frame() const { return _last_Java_sp != NULL; }
aoqi@0	81	// This is very dangerous unless sp == NULL
aoqi@0	82	// Invalidate the anchor so that has_last_frame is false
aoqi@0	83	// and no one should look at the other fields.
aoqi@0	84	void zap(void) { _last_Java_sp = NULL; }
aoqi@0	85
aoqi@0	86	#ifdef TARGET_ARCH_x86
aoqi@0	87	# include "javaFrameAnchor_x86.hpp"
aoqi@0	88	#endif
aoqi@1	89	#ifdef TARGET_ARCH_mips
aoqi@1	90	# include "javaFrameAnchor_mips.hpp"
aoqi@1	91	#endif
aoqi@0	92	#ifdef TARGET_ARCH_sparc
aoqi@0	93	# include "javaFrameAnchor_sparc.hpp"
aoqi@0	94	#endif
aoqi@0	95	#ifdef TARGET_ARCH_zero
aoqi@0	96	# include "javaFrameAnchor_zero.hpp"
aoqi@0	97	#endif
aoqi@0	98	#ifdef TARGET_ARCH_arm
aoqi@0	99	# include "javaFrameAnchor_arm.hpp"
aoqi@0	100	#endif
aoqi@0	101	#ifdef TARGET_ARCH_ppc
aoqi@0	102	# include "javaFrameAnchor_ppc.hpp"
aoqi@0	103	#endif
aoqi@0	104
aoqi@0	105
aoqi@0	106	public:
aoqi@0	107	JavaFrameAnchor() { clear(); }
aoqi@0	108	JavaFrameAnchor(JavaFrameAnchor *src) { copy(src); }
aoqi@0	109
aoqi@0	110	void set_last_Java_pc(address pc) { _last_Java_pc = pc; }
aoqi@0	111
aoqi@0	112	// Assembly stub generation helpers
aoqi@0	113
aoqi@0	114	static ByteSize last_Java_sp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }
aoqi@0	115	static ByteSize last_Java_pc_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }
aoqi@0	116
aoqi@0	117	};
aoqi@0	118
aoqi@0	119	#endif // SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP