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. 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_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 38 class 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 52 class 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->ends_with(';'))); 69 } 70 71 static bool is_valuetype(Symbol* signature) { 72 return signature->is_Q_signature(); 73 } 74 75 // Parse field and extract array information. Works for T_ARRAY only. 76 static BasicType get_array_info(Symbol* signature, FieldArrayInfo& ai, TRAPS); 77 }; 78 79 #endif // SHARE_RUNTIME_FIELDTYPE_HPP