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src/share/vm/code/location.hpp@ac27a9c85bea (annotated)

src/share/vm/code/location.hpp

Thu, 24 May 2018 18:41:44 +0800

author

aoqi

date

Thu, 24 May 2018 18:41:44 +0800

changeset 8856

ac27a9c85bea

parent 6876

710a3c8b516e

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2010, 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@0	25	#ifndef SHARE_VM_CODE_LOCATION_HPP
aoqi@0	26	#define SHARE_VM_CODE_LOCATION_HPP
aoqi@0	27
aoqi@0	28	#include "asm/assembler.hpp"
aoqi@0	29	#include "code/vmreg.hpp"
aoqi@0	30	#include "memory/allocation.hpp"
aoqi@0	31
aoqi@0	32	// A Location describes a concrete machine variable location
aoqi@0	33	// (such as integer or floating point register or a stack-held
aoqi@0	34	// variable). Used when generating debug-information for nmethods.
aoqi@0	35	//
aoqi@0	36	// Encoding:
aoqi@0	37	//
aoqi@0	38	// bits (use low bits for best compression):
aoqi@0	39	// Type: [3..0]
aoqi@0	40	// Where: [4]
aoqi@0	41	// Offset: [31..5]
aoqi@0	42
aoqi@0	43	class Location VALUE_OBJ_CLASS_SPEC {
aoqi@0	44	friend class VMStructs;
aoqi@0	45	public:
aoqi@0	46	enum Where {
aoqi@0	47	on_stack,
aoqi@0	48	in_register
aoqi@0	49	};
aoqi@0	50
aoqi@0	51	enum Type {
aoqi@0	52	invalid, // Invalid location
aoqi@0	53	normal, // Ints, floats, double halves
aoqi@0	54	oop, // Oop (please GC me!)
aoqi@0	55	int_in_long, // Integer held in long register
aoqi@0	56	lng, // Long held in one register
aoqi@0	57	float_in_dbl, // Float held in double register
aoqi@0	58	dbl, // Double held in one register
aoqi@0	59	addr, // JSR return address
aoqi@0	60	narrowoop // Narrow Oop (please GC me!)
aoqi@0	61	};
aoqi@0	62
aoqi@0	63
aoqi@0	64	private:
aoqi@0	65	enum {
aoqi@0	66	TYPE_MASK = (juint) 0x0F,
aoqi@0	67	TYPE_SHIFT = 0,
aoqi@0	68	WHERE_MASK = (juint) 0x10,
aoqi@0	69	WHERE_SHIFT = 4,
aoqi@0	70	OFFSET_MASK = (juint) 0xFFFFFFE0,
aoqi@0	71	OFFSET_SHIFT = 5
aoqi@0	72	};
aoqi@0	73
aoqi@0	74	juint _value;
aoqi@0	75
aoqi@0	76	// Create a bit-packed Location
aoqi@0	77	Location(Where where_, Type type_, unsigned offset_) {
aoqi@0	78	set(where_, type_, offset_);
aoqi@0	79	assert( where () == where_ , "" );
aoqi@0	80	assert( type () == type_ , "" );
aoqi@0	81	assert( offset() == offset_, "" );
aoqi@0	82	}
aoqi@0	83
aoqi@0	84	inline void set(Where where_, Type type_, unsigned offset_) {
aoqi@0	85	_value = (juint) ((where_ << WHERE_SHIFT) |
aoqi@0	86	(type_ << TYPE_SHIFT) |
aoqi@0	87	((offset_ << OFFSET_SHIFT) & OFFSET_MASK));
aoqi@0	88	}
aoqi@0	89
aoqi@0	90	public:
aoqi@0	91
aoqi@0	92	// Stack location Factory. Offset is 4-byte aligned; remove low bits
aoqi@0	93	static Location new_stk_loc( Type t, int offset ) { return Location(on_stack,t,offset>>LogBytesPerInt); }
aoqi@0	94	// Register location Factory
aoqi@0	95	static Location new_reg_loc( Type t, VMReg reg ) { return Location(in_register, t, reg->value()); }
aoqi@0	96	// Default constructor
aoqi@0	97	Location() { set(on_stack,invalid,0); }
aoqi@0	98
aoqi@0	99	// Bit field accessors
aoqi@0	100	Where where() const { return (Where) ((_value & WHERE_MASK) >> WHERE_SHIFT);}
aoqi@0	101	Type type() const { return (Type) ((_value & TYPE_MASK) >> TYPE_SHIFT); }
aoqi@0	102	unsigned offset() const { return (unsigned) ((_value & OFFSET_MASK) >> OFFSET_SHIFT); }
aoqi@0	103
aoqi@0	104	// Accessors
aoqi@0	105	bool is_register() const { return where() == in_register; }
aoqi@0	106	bool is_stack() const { return where() == on_stack; }
aoqi@0	107
aoqi@0	108	int stack_offset() const { assert(where() == on_stack, "wrong Where"); return offset()<<LogBytesPerInt; }
aoqi@0	109	int register_number() const { assert(where() == in_register, "wrong Where"); return offset() ; }
aoqi@0	110
aoqi@0	111	VMReg reg() const { assert(where() == in_register, "wrong Where"); return VMRegImpl::as_VMReg(offset()) ; }
aoqi@0	112
aoqi@0	113	// Printing
aoqi@0	114	void print_on(outputStream* st) const;
aoqi@0	115
aoqi@0	116	// Serialization of debugging information
aoqi@0	117	Location(DebugInfoReadStream* stream);
aoqi@0	118	void write_on(DebugInfoWriteStream* stream);
aoqi@0	119
aoqi@0	120	// check
aoqi@0	121	static bool legal_offset_in_bytes(int offset_in_bytes);
aoqi@0	122	};
aoqi@0	123
aoqi@0	124	#endif // SHARE_VM_CODE_LOCATION_HPP