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