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src/share/vm/runtime/javaFrameAnchor.hpp@a61af66fc99e (annotated)

src/share/vm/runtime/javaFrameAnchor.hpp

Sat, 01 Dec 2007 00:00:00 +0000

author

duke

date

Sat, 01 Dec 2007 00:00:00 +0000

changeset 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

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duke@435	1	/*
duke@435	2	* Copyright 2002-2005 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	// An object for encapsulating the machine/os dependent part of a JavaThread frame state
duke@435	26	//
duke@435	27	class JavaThread;
duke@435	28
duke@435	29	class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {
duke@435	30	// Too many friends...
duke@435	31	friend class CallNativeDirectNode;
duke@435	32	friend class OptoRuntime;
duke@435	33	friend class Runtime1;
duke@435	34	friend class StubAssembler;
duke@435	35	friend class CallRuntimeDirectNode;
duke@435	36	friend class MacroAssembler;
duke@435	37	friend class InterpreterGenerator;
duke@435	38	friend class LIR_Assembler;
duke@435	39	friend class GraphKit;
duke@435	40	friend class StubGenerator;
duke@435	41	friend class JavaThread;
duke@435	42	friend class frame;
duke@435	43	friend class VMStructs;
duke@435	44	friend class BytecodeInterpreter;
duke@435	45	friend class JavaCallWrapper;
duke@435	46
duke@435	47	private:
duke@435	48	//
duke@435	49	// Whenever _last_Java_sp != NULL other anchor fields MUST be valid!
duke@435	50	// The stack may not be walkable [check with walkable() ] but the values must be valid.
duke@435	51	// The profiler apparently depends on this.
duke@435	52	//
duke@435	53	intptr_t* volatile _last_Java_sp;
duke@435	54
duke@435	55	// Whenever we call from Java to native we can not be assured that the return
duke@435	56	// address that composes the last_Java_frame will be in an accessible location
duke@435	57	// so calls from Java to native store that pc (or one good enough to locate
duke@435	58	// the oopmap) in the frame anchor. Since the frames that call from Java to
duke@435	59	// native are never deoptimized we never need to patch the pc and so this
duke@435	60	// is acceptable.
duke@435	61	volatile address _last_Java_pc;
duke@435	62
duke@435	63	// tells whether the last Java frame is set
duke@435	64	// It is important that when last_Java_sp != NULL that the rest of the frame
duke@435	65	// anchor (including platform specific) all be valid.
duke@435	66
duke@435	67	bool has_last_Java_frame() const { return _last_Java_sp != NULL; }
duke@435	68	// This is very dangerous unless sp == NULL
duke@435	69	// Invalidate the anchor so that has_last_frame is false
duke@435	70	// and no one should look at the other fields.
duke@435	71	void zap(void) { _last_Java_sp = NULL; }
duke@435	72
duke@435	73	#include "incls/_javaFrameAnchor_pd.hpp.incl"
duke@435	74
duke@435	75	public:
duke@435	76	JavaFrameAnchor() { clear(); }
duke@435	77	JavaFrameAnchor(JavaFrameAnchor *src) { copy(src); }
duke@435	78
duke@435	79	address last_Java_pc(void) { return _last_Java_pc; }
duke@435	80	void set_last_Java_pc(address pc) { _last_Java_pc = pc; }
duke@435	81
duke@435	82	// Assembly stub generation helpers
duke@435	83
duke@435	84	static ByteSize last_Java_sp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }
duke@435	85	static ByteSize last_Java_pc_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }
duke@435	86
duke@435	87	};