1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/runtime/fieldType.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,76 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_RUNTIME_FIELDTYPE_HPP
1.29 +#define SHARE_VM_RUNTIME_FIELDTYPE_HPP
1.30 +
1.31 +#include "memory/allocation.hpp"
1.32 +#include "oops/symbol.hpp"
1.33 +
1.34 +// Note: FieldType should be based on the SignatureIterator (or vice versa).
1.35 +// In any case, this structure should be re-thought at some point.
1.36 +
1.37 +// A FieldType is used to determine the type of a field from a signature string.
1.38 +
1.39 +// Information returned by get_array_info, which is scoped to decrement
1.40 +// reference count if a Symbol is created in the case of T_OBJECT
1.41 +class FieldArrayInfo : public StackObj {
1.42 + friend class FieldType; // field type can set these fields.
1.43 + int _dimension;
1.44 + Symbol* _object_key;
1.45 + public:
1.46 + int dimension() { return _dimension; }
1.47 + Symbol* object_key() { return _object_key; }
1.48 + // basic constructor
1.49 + FieldArrayInfo() : _dimension(0), _object_key(NULL) {}
1.50 + // destructor decrements object key's refcount if created
1.51 + ~FieldArrayInfo() { if (_object_key != NULL) _object_key->decrement_refcount(); }
1.52 +};
1.53 +
1.54 +
1.55 +class FieldType: public AllStatic {
1.56 + private:
1.57 + static void skip_optional_size(Symbol* signature, int* index);
1.58 + static bool is_valid_array_signature(Symbol* signature);
1.59 + public:
1.60 +
1.61 + // Return basic type
1.62 + static BasicType basic_type(Symbol* signature);
1.63 +
1.64 + // Testing
1.65 + static bool is_array(Symbol* signature) { return signature->utf8_length() > 1 && signature->byte_at(0) == '[' && is_valid_array_signature(signature); }
1.66 +
1.67 + static bool is_obj(Symbol* signature) {
1.68 + int sig_length = signature->utf8_length();
1.69 + // Must start with 'L' and end with ';'
1.70 + return (sig_length >= 2 &&
1.71 + (signature->byte_at(0) == 'L') &&
1.72 + (signature->byte_at(sig_length - 1) == ';'));
1.73 + }
1.74 +
1.75 + // Parse field and extract array information. Works for T_ARRAY only.
1.76 + static BasicType get_array_info(Symbol* signature, FieldArrayInfo& ai, TRAPS);
1.77 +};
1.78 +
1.79 +#endif // SHARE_VM_RUNTIME_FIELDTYPE_HPP
