| /* |
| * Copyright (c) 2011, 2017, 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_OOPS_FIELDSTREAMS_HPP |
| #define SHARE_VM_OOPS_FIELDSTREAMS_HPP |
| |
| #include "oops/instanceKlass.hpp" |
| #include "oops/fieldInfo.hpp" |
| #include "runtime/fieldDescriptor.hpp" |
| |
| // The is the base class for iteration over the fields array |
| // describing the declared fields in the class. Several subclasses |
| // are provided depending on the kind of iteration required. The |
| // JavaFieldStream is for iterating over regular Java fields and it |
| // generally the preferred iterator. InternalFieldStream only |
| // iterates over fields that have been injected by the JVM. |
| // AllFieldStream exposes all fields and should only be used in rare |
| // cases. |
| class FieldStreamBase : public StackObj { |
| protected: |
| Array<u2>* _fields; |
| constantPoolHandle _constants; |
| int _index; |
| int _limit; |
| int _generic_signature_slot; |
| fieldDescriptor _fd_buf; |
| |
| FieldInfo* field() const { return FieldInfo::from_field_array(_fields, _index); } |
| InstanceKlass* field_holder() const { return _constants->pool_holder(); } |
| |
| int init_generic_signature_start_slot() { |
| int length = _fields->length(); |
| int num_fields = _index; |
| int skipped_generic_signature_slots = 0; |
| FieldInfo* fi; |
| AccessFlags flags; |
| /* Scan from 0 to the current _index. Count the number of generic |
| signature slots for field[0] to field[_index - 1]. */ |
| for (int i = 0; i < _index; i++) { |
| fi = FieldInfo::from_field_array(_fields, i); |
| flags.set_flags(fi->access_flags()); |
| if (flags.field_has_generic_signature()) { |
| length --; |
| skipped_generic_signature_slots ++; |
| } |
| } |
| /* Scan from the current _index. */ |
| for (int i = _index; i*FieldInfo::field_slots < length; i++) { |
| fi = FieldInfo::from_field_array(_fields, i); |
| flags.set_flags(fi->access_flags()); |
| if (flags.field_has_generic_signature()) { |
| length --; |
| } |
| num_fields ++; |
| } |
| _generic_signature_slot = length + skipped_generic_signature_slots; |
| assert(_generic_signature_slot <= _fields->length(), ""); |
| return num_fields; |
| } |
| |
| FieldStreamBase(Array<u2>* fields, const constantPoolHandle& constants, int start, int limit) { |
| _fields = fields; |
| _constants = constants; |
| _index = start; |
| int num_fields = init_generic_signature_start_slot(); |
| if (limit < start) { |
| _limit = num_fields; |
| } else { |
| _limit = limit; |
| } |
| } |
| |
| FieldStreamBase(Array<u2>* fields, const constantPoolHandle& constants) { |
| _fields = fields; |
| _constants = constants; |
| _index = 0; |
| _limit = init_generic_signature_start_slot(); |
| } |
| |
| public: |
| FieldStreamBase(InstanceKlass* klass) { |
| _fields = klass->fields(); |
| _constants = klass->constants(); |
| _index = 0; |
| _limit = klass->java_fields_count(); |
| init_generic_signature_start_slot(); |
| assert(klass == field_holder(), ""); |
| } |
| |
| // accessors |
| int index() const { return _index; } |
| |
| void next() { |
| if (access_flags().field_has_generic_signature()) { |
| _generic_signature_slot ++; |
| assert(_generic_signature_slot <= _fields->length(), ""); |
| } |
| _index += 1; |
| } |
| bool done() const { return _index >= _limit; } |
| |
| // Accessors for current field |
| AccessFlags access_flags() const { |
| AccessFlags flags; |
| flags.set_flags(field()->access_flags()); |
| return flags; |
| } |
| |
| void set_access_flags(u2 flags) const { |
| field()->set_access_flags(flags); |
| } |
| |
| void set_access_flags(AccessFlags flags) const { |
| set_access_flags(flags.as_short()); |
| } |
| |
| Symbol* name() const { |
| return field()->name(_constants); |
| } |
| |
| Symbol* signature() const { |
| return field()->signature(_constants); |
| } |
| |
| Symbol* generic_signature() const { |
| if (access_flags().field_has_generic_signature()) { |
| assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
| int index = _fields->at(_generic_signature_slot); |
| return _constants->symbol_at(index); |
| } else { |
| return NULL; |
| } |
| } |
| |
| int offset() const { |
| return field()->offset(); |
| } |
| |
| int allocation_type() const { |
| return field()->allocation_type(); |
| } |
| |
| void set_offset(int offset) { |
| field()->set_offset(offset); |
| } |
| |
| bool is_offset_set() const { |
| return field()->is_offset_set(); |
| } |
| |
| bool is_contended() const { |
| return field()->is_contended(); |
| } |
| |
| int contended_group() const { |
| return field()->contended_group(); |
| } |
| |
| // bridge to a heavier API: |
| fieldDescriptor& field_descriptor() const { |
| fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf); |
| field.reinitialize(field_holder(), _index); |
| return field; |
| } |
| }; |
| |
| // Iterate over only the internal fields |
| class JavaFieldStream : public FieldStreamBase { |
| public: |
| JavaFieldStream(const InstanceKlass* k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {} |
| |
| int name_index() const { |
| assert(!field()->is_internal(), "regular only"); |
| return field()->name_index(); |
| } |
| void set_name_index(int index) { |
| assert(!field()->is_internal(), "regular only"); |
| field()->set_name_index(index); |
| } |
| int signature_index() const { |
| assert(!field()->is_internal(), "regular only"); |
| return field()->signature_index(); |
| } |
| void set_signature_index(int index) { |
| assert(!field()->is_internal(), "regular only"); |
| field()->set_signature_index(index); |
| } |
| int generic_signature_index() const { |
| assert(!field()->is_internal(), "regular only"); |
| if (access_flags().field_has_generic_signature()) { |
| assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
| return _fields->at(_generic_signature_slot); |
| } else { |
| return 0; |
| } |
| } |
| void set_generic_signature_index(int index) { |
| assert(!field()->is_internal(), "regular only"); |
| if (access_flags().field_has_generic_signature()) { |
| assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
| _fields->at_put(_generic_signature_slot, index); |
| } |
| } |
| int initval_index() const { |
| assert(!field()->is_internal(), "regular only"); |
| return field()->initval_index(); |
| } |
| void set_initval_index(int index) { |
| assert(!field()->is_internal(), "regular only"); |
| return field()->set_initval_index(index); |
| } |
| }; |
| |
| |
| // Iterate over only the internal fields |
| class InternalFieldStream : public FieldStreamBase { |
| public: |
| InternalFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {} |
| }; |
| |
| |
| class AllFieldStream : public FieldStreamBase { |
| public: |
| AllFieldStream(Array<u2>* fields, const constantPoolHandle& constants): FieldStreamBase(fields, constants) {} |
| AllFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants()) {} |
| }; |
| |
| #endif // SHARE_VM_OOPS_FIELDSTREAMS_HPP |