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