1 /*
   2  * Copyright (c) 1997, 2010, 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.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_FIELDTYPE_HPP
  26 #define SHARE_VM_RUNTIME_FIELDTYPE_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "oops/symbolOop.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 class FieldType: public AllStatic {
  37  private:
  38   static void skip_optional_size(symbolOop signature, int* index);
  39   static bool is_valid_array_signature(symbolOop signature);
  40  public:
  41 
  42   // Return basic type
  43   static BasicType basic_type(symbolOop signature);
  44 
  45   // Testing
  46   static bool is_array(symbolOop signature) { return signature->utf8_length() > 1 && signature->byte_at(0) == '[' && is_valid_array_signature(signature); }
  47 
  48   static bool is_obj(symbolOop signature) {
  49      int sig_length = signature->utf8_length();
  50      // Must start with 'L' and end with ';'
  51      return (sig_length >= 2 &&
  52              (signature->byte_at(0) == 'L') &&
  53              (signature->byte_at(sig_length - 1) == ';'));
  54   }
  55 
  56   // Parse field and extract array information. Works for T_ARRAY only.
  57   static BasicType get_array_info(symbolOop signature, jint* dimension, symbolOop *object_key, TRAPS);
  58 };
  59 
  60 #endif // SHARE_VM_RUNTIME_FIELDTYPE_HPP