1/*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
24
25#ifndef SHARE_RUNTIME_FIELDTYPE_HPP
26#define SHARE_RUNTIME_FIELDTYPE_HPP
27
28#include "memory/allocation.hpp"
29#include "oops/symbol.hpp"
30
31// Note: FieldType should be based on the SignatureIterator (or vice versa).
32// In any case, this structure should be re-thought at some point.
33
34// A FieldType is used to determine the type of a field from a signature string.
35
36// Information returned by get_array_info, which is scoped to decrement
37// reference count if a Symbol is created in the case of T_OBJECT
38class FieldArrayInfo : public StackObj {
39 friend class FieldType; // field type can set these fields.
40 int _dimension;
41 Symbol* _object_key;
42 public:
43 int dimension() { return _dimension; }
44 Symbol* object_key() { return _object_key; }
45 // basic constructor
46 FieldArrayInfo() : _dimension(0), _object_key(NULL) {}
47 // destructor decrements object key's refcount if created
48 ~FieldArrayInfo() { if (_object_key != NULL) _object_key->decrement_refcount(); }
49};
50
51
52class FieldType: public AllStatic {
53 private:
54 static bool is_valid_array_signature(Symbol* signature);
55 public:
56
57 // Return basic type
58 static BasicType basic_type(Symbol* signature);
59
60 // Testing
61 static bool is_array(Symbol* signature) { return signature->utf8_length() > 1 && signature->char_at(0) == '[' && is_valid_array_signature(signature); }
62
63 static bool is_obj(Symbol* signature) {
64 int sig_length = signature->utf8_length();
65 // Must start with 'L' and end with ';'
66 return (sig_length >= 2 &&
67 (signature->char_at(0) == 'L') &&
68 (signature->char_at(sig_length - 1) == ';'));
69 }
70
71 // Parse field and extract array information. Works for T_ARRAY only.
72 static BasicType get_array_info(Symbol* signature, FieldArrayInfo& ai, TRAPS);
73};
74
75#endif // SHARE_RUNTIME_FIELDTYPE_HPP
76