1 /* 2 * Copyright (c) 2017, 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 #include "precompiled.hpp" 26 #include "ci/ciField.hpp" 27 #include "ci/ciUtilities.inline.hpp" 28 #include "ci/ciValueKlass.hpp" 29 #include "oops/valueKlass.hpp" 30 31 int ciValueKlass::compute_nonstatic_fields() { 32 int result = ciInstanceKlass::compute_nonstatic_fields(); 33 assert(super() == NULL || !super()->has_nonstatic_fields(), "a value type must not inherit fields from its superclass"); 34 35 // Compute declared non-static fields (without flattening of value type fields) 36 GrowableArray<ciField*>* fields = NULL; 37 GUARDED_VM_ENTRY(fields = compute_nonstatic_fields_impl(NULL, false /* no flattening */);) 38 Arena* arena = CURRENT_ENV->arena(); 39 _declared_nonstatic_fields = (fields != NULL) ? fields : new (arena) GrowableArray<ciField*>(arena, 0, 0, 0); 40 return result; 41 } 42 43 // Offset of the first field in the value type 44 int ciValueKlass::first_field_offset() const { 45 GUARDED_VM_ENTRY(return ValueKlass::cast(get_Klass())->first_field_offset();) 46 } 47 48 // Returns the index of the field with the given offset. If the field at 'offset' 49 // belongs to a flattened value type field, return the index of the field 50 // in the flattened value type. 51 int ciValueKlass::field_index_by_offset(int offset) { 52 assert(contains_field_offset(offset), "invalid field offset"); 53 int best_offset = 0; 54 int best_index = -1; 55 // Search the field with the given offset 56 for (int i = 0; i < nof_declared_nonstatic_fields(); ++i) { 57 int field_offset = _declared_nonstatic_fields->at(i)->offset(); 58 if (field_offset == offset) { 59 // Exact match 60 return i; 61 } else if (field_offset < offset && field_offset > best_offset) { 62 // No exact match. Save the index of the field with the closest offset that 63 // is smaller than the given field offset. This index corresponds to the 64 // flattened value type field that holds the field we are looking for. 65 best_offset = field_offset; 66 best_index = i; 67 } 68 } 69 assert(best_index >= 0, "field not found"); 70 assert(best_offset == offset || _declared_nonstatic_fields->at(best_index)->type()->is_valuetype(), "offset should match for non-VTs"); 71 return best_index; 72 } 73 74 // Are arrays containing this value type flattened? 75 bool ciValueKlass::flatten_array() const { 76 GUARDED_VM_ENTRY(return ValueKlass::cast(get_Klass())->flatten_array();) 77 } 78 79 // Can this value type be returned as multiple values? 80 bool ciValueKlass::can_be_returned_as_fields() const { 81 GUARDED_VM_ENTRY(return ValueKlass::cast(get_Klass())->can_be_returned_as_fields();) 82 } 83 84 // Can this value type be returned as multiple values? 85 bool ciValueKlass::is_bufferable() const { 86 GUARDED_VM_ENTRY(return ValueKlass::cast(get_Klass())->is_bufferable();) 87 } 88 89 // When passing a value type's fields as arguments, count the number 90 // of argument slots that are needed 91 int ciValueKlass::value_arg_slots() { 92 int slots = nof_nonstatic_fields(); 93 for (int j = 0; j < nof_nonstatic_fields(); j++) { 94 ciField* f = nonstatic_field_at(j); 95 BasicType bt = f->type()->basic_type(); 96 if (bt == T_LONG || bt == T_DOUBLE) { 97 slots++; 98 } 99 } 100 return slots; 101 } 102 103 // Offset of the default oop in the mirror 104 int ciValueKlass::default_value_offset() const { 105 GUARDED_VM_ENTRY(return ValueKlass::cast(get_Klass())->default_value_offset();) 106 } 107 108 ciInstance* ciValueKlass::default_value_instance() const { 109 GUARDED_VM_ENTRY( 110 oop default_value = ValueKlass::cast(get_Klass())->default_value(); 111 return CURRENT_ENV->get_instance(default_value); 112 ) 113 } 114 115 bool ciValueKlass::contains_oops() const { 116 GUARDED_VM_ENTRY(return ValueKlass::cast(get_Klass())->contains_oops();) 117 }