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/arrayStorageProperties.hpp" 30 #include "oops/symbol.hpp" 31 32 // Note: FieldType should be based on the SignatureIterator (or vice versa). 33 // In any case, this structure should be re-thought at some point. 34 35 // A FieldType is used to determine the type of a field from a signature string. 36 37 // Information returned by get_array_info, which is scoped to decrement 38 // reference count if a Symbol is created in the case of T_OBJECT 39 class FieldArrayInfo : public StackObj { 40 friend class FieldType; // field type can set these fields. 41 int _dimension; 42 Symbol* _object_key; 43 ArrayStorageProperties _storage_props; 44 public: 45 int dimension() { return _dimension; } 46 Symbol* object_key() { return _object_key; } 47 ArrayStorageProperties storage_props() { return _storage_props; } 48 // basic constructor 49 FieldArrayInfo() : _dimension(0), _object_key(NULL), _storage_props(ArrayStorageProperties::empty) {} 50 // destructor decrements object key's refcount if created 51 ~FieldArrayInfo() { if (_object_key != NULL) _object_key->decrement_refcount(); } 52 }; 53 54 55 class FieldType: public AllStatic { 56 private: 57 static bool is_valid_array_signature(Symbol* signature); 58 public: 59 60 // Return basic type 61 static BasicType basic_type(Symbol* signature); 62 63 // Testing 64 static bool is_array(Symbol* signature) { return signature->utf8_length() > 1 && signature->char_at(0) == '[' && is_valid_array_signature(signature); } 65 66 static bool is_obj(Symbol* signature) { 67 int sig_length = signature->utf8_length(); 68 // Must start with 'L' and end with ';' 69 return (sig_length >= 2 && 70 (signature->char_at(0) == 'L') && 71 (signature->char_at(sig_length - 1) == ';')); 72 } 73 74 static bool is_valuetype(Symbol* signature) { 75 return signature->is_Q_signature(); 76 } 77 78 // Parse field and extract array information. Works for T_ARRAY only. 79 static BasicType get_array_info(Symbol* signature, FieldArrayInfo& ai, TRAPS); 80 81 // LWorld (LW2) Q-type array descriptors require null-free, and preferably flat if possible 82 static ArrayStorageProperties get_array_storage_properties(Symbol* signature); 83 }; 84 85 #endif // SHARE_RUNTIME_FIELDTYPE_HPP