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

src/share/vm/runtime/registerMap.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

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duke@435	1	/*
duke@435	2	* Copyright 2002-2007 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	class JavaThread;
duke@435	26
duke@435	27	//
duke@435	28	// RegisterMap
duke@435	29	//
duke@435	30	// A companion structure used for stack traversal. The RegisterMap contains
duke@435	31	// misc. information needed in order to do correct stack traversal of stack
duke@435	32	// frames. Hence, it must always be passed in as an argument to
duke@435	33	// frame::sender(RegisterMap*).
duke@435	34	//
duke@435	35	// In particular,
duke@435	36	// 1) It provides access to the thread for which the stack belongs. The
duke@435	37	// thread object is needed in order to get sender of a deoptimized frame.
duke@435	38	//
duke@435	39	// 2) It is used to pass information from a callee frame to its caller
duke@435	40	// frame about how the frame should be traversed. This is used to let
duke@435	41	// the caller frame take care of calling oops-do of out-going
duke@435	42	// arguments, when the callee frame is not instantiated yet. This
duke@435	43	// happens, e.g., when a compiled frame calls into
duke@435	44	// resolve_virtual_call. (Hence, it is critical that the same
duke@435	45	// RegisterMap object is used for the entire stack walk. Normally,
duke@435	46	// this is hidden by using the StackFrameStream.) This is used when
duke@435	47	// doing follow_oops and oops_do.
duke@435	48	//
duke@435	49	// 3) The RegisterMap keeps track of the values of callee-saved registers
duke@435	50	// from frame to frame (hence, the name). For some stack traversal the
duke@435	51	// values of the callee-saved registers does not matter, e.g., if you
duke@435	52	// only need the static properies such as frame type, pc, and such.
duke@435	53	// Updating of the RegisterMap can be turned off by instantiating the
duke@435	54	// register map as: RegisterMap map(thread, false);
duke@435	55
duke@435	56	class RegisterMap : public StackObj {
duke@435	57	public:
duke@435	58	typedef julong LocationValidType;
duke@435	59	enum {
duke@435	60	reg_count = ConcreteRegisterImpl::number_of_registers,
duke@435	61	location_valid_type_size = sizeof(LocationValidType)*8,
duke@435	62	location_valid_size = (reg_count+location_valid_type_size-1)/location_valid_type_size
duke@435	63	};
duke@435	64	private:
duke@435	65	intptr_t* _location[reg_count]; // Location of registers (intptr_t* looks better than address in the debugger)
duke@435	66	LocationValidType _location_valid[location_valid_size];
duke@435	67	bool _include_argument_oops; // Should include argument_oop marked locations for compiler
duke@435	68	JavaThread* _thread; // Reference to current thread
duke@435	69	bool _update_map; // Tells if the register map need to be
duke@435	70	// updated when traversing the stack
duke@435	71
duke@435	72	#ifdef ASSERT
duke@435	73	void check_location_valid();
duke@435	74	#else
duke@435	75	void check_location_valid() {}
duke@435	76	#endif
duke@435	77
duke@435	78	public:
duke@435	79	debug_only(intptr_t* _update_for_id;) // Assert that RegisterMap is not updated twice for same frame
duke@435	80	RegisterMap(JavaThread *thread, bool update_map = true);
duke@435	81	RegisterMap(const RegisterMap* map);
duke@435	82
duke@435	83	address location(VMReg reg) const {
duke@435	84	int index = reg->value() / location_valid_type_size;
duke@435	85	assert(0 <= reg->value() && reg->value() < reg_count, "range check");
duke@435	86	assert(0 <= index && index < location_valid_size, "range check");
duke@435	87	if (_location_valid[index] & ((LocationValidType)1 << (reg->value() % location_valid_type_size))) {
duke@435	88	return (address) _location[reg->value()];
duke@435	89	} else {
duke@435	90	return pd_location(reg);
duke@435	91	}
duke@435	92	}
duke@435	93
duke@435	94	void set_location(VMReg reg, address loc) {
duke@435	95	int index = reg->value() / location_valid_type_size;
duke@435	96	assert(0 <= reg->value() && reg->value() < reg_count, "range check");
duke@435	97	assert(0 <= index && index < location_valid_size, "range check");
duke@435	98	assert(_update_map, "updating map that does not need updating");
duke@435	99	_location[reg->value()] = (intptr_t*) loc;
duke@435	100	_location_valid[index] |= ((LocationValidType)1 << (reg->value() % location_valid_type_size));
duke@435	101	check_location_valid();
duke@435	102	}
duke@435	103
duke@435	104	// Called by an entry frame.
duke@435	105	void clear();
duke@435	106
duke@435	107	bool include_argument_oops() const { return _include_argument_oops; }
duke@435	108	void set_include_argument_oops(bool f) { _include_argument_oops = f; }
duke@435	109
duke@435	110	JavaThread *thread() const { return _thread; }
duke@435	111	bool update_map() const { return _update_map; }
duke@435	112
duke@435	113	void print_on(outputStream* st) const;
duke@435	114	void print() const;
duke@435	115
duke@435	116	// the following contains the definition of pd_xxx methods
duke@435	117	# include "incls/_registerMap_pd.hpp.incl"
duke@435	118	};