duke@435: /*
trims@2708:  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_RUNTIME_FIELDTYPE_HPP
stefank@2314: #define SHARE_VM_RUNTIME_FIELDTYPE_HPP
stefank@2314: 
stefank@2314: #include "memory/allocation.hpp"
coleenp@2497: #include "oops/symbol.hpp"
stefank@2314: 
duke@435: // Note: FieldType should be based on the SignatureIterator (or vice versa).
duke@435: //       In any case, this structure should be re-thought at some point.
duke@435: 
duke@435: // A FieldType is used to determine the type of a field from a signature string.
duke@435: 
coleenp@2497: // Information returned by get_array_info, which is scoped to decrement
coleenp@2497: // reference count if a Symbol is created in the case of T_OBJECT
coleenp@2497: class FieldArrayInfo : public StackObj {
coleenp@2497:   friend class FieldType;  // field type can set these fields.
coleenp@2497:   int       _dimension;
coleenp@2497:   Symbol*   _object_key;
coleenp@2497:  public:
coleenp@2497:   int       dimension()    { return _dimension; }
coleenp@2497:   Symbol*   object_key()   { return _object_key; }
coleenp@2497:   // basic constructor
coleenp@2497:   FieldArrayInfo() : _dimension(0), _object_key(NULL) {}
coleenp@2497:   // destructor decrements object key's refcount if created
coleenp@2497:   ~FieldArrayInfo() { if (_object_key != NULL) _object_key->decrement_refcount(); }
coleenp@2497: };
coleenp@2497: 
coleenp@2497: 
duke@435: class FieldType: public AllStatic {
duke@435:  private:
coleenp@2497:   static void skip_optional_size(Symbol* signature, int* index);
coleenp@2497:   static bool is_valid_array_signature(Symbol* signature);
duke@435:  public:
duke@435: 
duke@435:   // Return basic type
coleenp@2497:   static BasicType basic_type(Symbol* signature);
duke@435: 
duke@435:   // Testing
coleenp@2497:   static bool is_array(Symbol* signature) { return signature->utf8_length() > 1 && signature->byte_at(0) == '[' && is_valid_array_signature(signature); }
duke@435: 
coleenp@2497:   static bool is_obj(Symbol* signature) {
duke@435:      int sig_length = signature->utf8_length();
duke@435:      // Must start with 'L' and end with ';'
duke@435:      return (sig_length >= 2 &&
duke@435:              (signature->byte_at(0) == 'L') &&
duke@435:              (signature->byte_at(sig_length - 1) == ';'));
duke@435:   }
duke@435: 
duke@435:   // Parse field and extract array information. Works for T_ARRAY only.
coleenp@2497:   static BasicType get_array_info(Symbol* signature, FieldArrayInfo& ai, TRAPS);
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_RUNTIME_FIELDTYPE_HPP