src/hotspot/share/runtime/fieldType.hpp
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Tue, 12 Sep 2017 19:03:39 +0200
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/*
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 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_RUNTIME_FIELDTYPE_HPP
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#define SHARE_VM_RUNTIME_FIELDTYPE_HPP
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#include "memory/allocation.hpp"
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#include "oops/symbol.hpp"
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// Note: FieldType should be based on the SignatureIterator (or vice versa).
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//       In any case, this structure should be re-thought at some point.
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// A FieldType is used to determine the type of a field from a signature string.
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// Information returned by get_array_info, which is scoped to decrement
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// reference count if a Symbol is created in the case of T_OBJECT
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class FieldArrayInfo : public StackObj {
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  friend class FieldType;  // field type can set these fields.
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  int       _dimension;
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  Symbol*   _object_key;
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 public:
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  int       dimension()    { return _dimension; }
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  Symbol*   object_key()   { return _object_key; }
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  // basic constructor
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  FieldArrayInfo() : _dimension(0), _object_key(NULL) {}
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  // destructor decrements object key's refcount if created
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  ~FieldArrayInfo() { if (_object_key != NULL) _object_key->decrement_refcount(); }
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};
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class FieldType: public AllStatic {
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 private:
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  static void skip_optional_size(Symbol* signature, int* index);
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  static bool is_valid_array_signature(Symbol* signature);
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  // Return basic type
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  static BasicType basic_type(Symbol* signature);
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  // Testing
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  static bool is_array(Symbol* signature) { return signature->utf8_length() > 1 && signature->byte_at(0) == '[' && is_valid_array_signature(signature); }
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  static bool is_obj(Symbol* signature) {
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     int sig_length = signature->utf8_length();
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     // Must start with 'L' and end with ';'
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     return (sig_length >= 2 &&
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             (signature->byte_at(0) == 'L') &&
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             (signature->byte_at(sig_length - 1) == ';'));
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  }
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  // Parse field and extract array information. Works for T_ARRAY only.
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  static BasicType get_array_info(Symbol* signature, FieldArrayInfo& ai, TRAPS);
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};
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#endif // SHARE_VM_RUNTIME_FIELDTYPE_HPP