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src/share/vm/runtime/fieldType.hpp@710a3c8b516e (annotated)

src/share/vm/runtime/fieldType.hpp

Tue, 08 Aug 2017 15:57:29 +0800

author

aoqi

date

Tue, 08 Aug 2017 15:57:29 +0800

changeset 6876

710a3c8b516e

parent 2708

1d1603768966

parent 0

f90c822e73f8

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 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@0	25	#ifndef SHARE_VM_RUNTIME_FIELDTYPE_HPP
aoqi@0	26	#define SHARE_VM_RUNTIME_FIELDTYPE_HPP
aoqi@0	27
aoqi@0	28	#include "memory/allocation.hpp"
aoqi@0	29	#include "oops/symbol.hpp"
aoqi@0	30
aoqi@0	31	// Note: FieldType should be based on the SignatureIterator (or vice versa).
aoqi@0	32	// In any case, this structure should be re-thought at some point.
aoqi@0	33
aoqi@0	34	// A FieldType is used to determine the type of a field from a signature string.
aoqi@0	35
aoqi@0	36	// Information returned by get_array_info, which is scoped to decrement
aoqi@0	37	// reference count if a Symbol is created in the case of T_OBJECT
aoqi@0	38	class FieldArrayInfo : public StackObj {
aoqi@0	39	friend class FieldType; // field type can set these fields.
aoqi@0	40	int _dimension;
aoqi@0	41	Symbol* _object_key;
aoqi@0	42	public:
aoqi@0	43	int dimension() { return _dimension; }
aoqi@0	44	Symbol* object_key() { return _object_key; }
aoqi@0	45	// basic constructor
aoqi@0	46	FieldArrayInfo() : _dimension(0), _object_key(NULL) {}
aoqi@0	47	// destructor decrements object key's refcount if created
aoqi@0	48	~FieldArrayInfo() { if (_object_key != NULL) _object_key->decrement_refcount(); }
aoqi@0	49	};
aoqi@0	50
aoqi@0	51
aoqi@0	52	class FieldType: public AllStatic {
aoqi@0	53	private:
aoqi@0	54	static void skip_optional_size(Symbol* signature, int* index);
aoqi@0	55	static bool is_valid_array_signature(Symbol* signature);
aoqi@0	56	public:
aoqi@0	57
aoqi@0	58	// Return basic type
aoqi@0	59	static BasicType basic_type(Symbol* signature);
aoqi@0	60
aoqi@0	61	// Testing
aoqi@0	62	static bool is_array(Symbol* signature) { return signature->utf8_length() > 1 && signature->byte_at(0) == '[' && is_valid_array_signature(signature); }
aoqi@0	63
aoqi@0	64	static bool is_obj(Symbol* signature) {
aoqi@0	65	int sig_length = signature->utf8_length();
aoqi@0	66	// Must start with 'L' and end with ';'
aoqi@0	67	return (sig_length >= 2 &&
aoqi@0	68	(signature->byte_at(0) == 'L') &&
aoqi@0	69	(signature->byte_at(sig_length - 1) == ';'));
aoqi@0	70	}
aoqi@0	71
aoqi@0	72	// Parse field and extract array information. Works for T_ARRAY only.
aoqi@0	73	static BasicType get_array_info(Symbol* signature, FieldArrayInfo& ai, TRAPS);
aoqi@0	74	};
aoqi@0	75
aoqi@0	76	#endif // SHARE_VM_RUNTIME_FIELDTYPE_HPP