1 /* 2 * Copyright (c) 2016, 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/ciValueKlass.hpp" 28 #include "oops/fieldStreams.hpp" 29 #include "oops/valueKlass.hpp" 30 31 int ciValueKlass::compute_field_index_map() { 32 assert(is_loaded(), "value class must be loaded to compute mapping of field indeces"); 33 34 if (_field_index_map != NULL) { 35 return _field_index_map->length(); 36 } 37 38 Arena* arena = CURRENT_ENV->arena(); 39 _field_index_map = new (arena) GrowableArray<int>(arena, nof_declared_nonstatic_fields(), 0, 0); 40 if (!has_nonstatic_fields()) { 41 return 0; 42 } 43 44 // FIXME: Once it is possible to construct class hierarchies with value types. 45 assert(!super()->has_nonstatic_fields(), "a value type must not inherit fields from its superclass"); 46 47 ValueKlass* vklass = ValueKlass::cast(get_Klass()); 48 for (JavaFieldStream fs(vklass); !fs.done(); fs.next()) { 49 if (fs.access_flags().is_static()) { 50 continue; 51 } 52 _field_index_map->append(fs.field_descriptor().index()); 53 } 54 return _field_index_map->length(); 55 } 56 57 // Number of value type fields 58 int ciValueKlass::field_count() { 59 if (_field_index_map == NULL) { 60 return compute_field_index_map(); 61 } else { 62 return _field_index_map->length(); 63 } 64 } 65 66 // Size of value type fields in words 67 int ciValueKlass::field_size() { 68 int size = 0; 69 for (int i = 0; i < field_count(); ++i) { 70 size += field_type_by_index(i)->size(); 71 } 72 return size; 73 } 74 75 // Returns the index of the field with the given offset. If the field at 'offset' 76 // belongs to a flattened value type field, return the index of the field 77 // in the flattened value type. 78 int ciValueKlass::field_index_by_offset(int offset) { 79 assert(contains_field_offset(offset), "invalid field offset"); 80 int best_offset = 0; 81 int best_index = -1; 82 // Search the field with the given offset 83 for (int i = 0; i < field_count(); ++i) { 84 int field_offset = field_offset_by_index(i); 85 if (field_offset == offset) { 86 // Exact match 87 return i; 88 } else if (field_offset < offset && field_offset > best_offset) { 89 // No exact match. Save the index of the field with the closest offset that 90 // is smaller than the given field offset. This index corresponds to the 91 // flattened value type field that holds the field we are looking for. 92 best_offset = field_offset; 93 best_index = i; 94 } 95 } 96 assert(best_index >= 0, "field not found"); 97 assert(best_offset == offset || field_type_by_index(best_index)->is_valuetype(), "offset should match for non-VTs"); 98 return best_index; 99 } 100 101 // Returns the field offset of the field with the given index 102 int ciValueKlass::field_offset_by_index(int index) { 103 if (_field_index_map == NULL) { 104 compute_field_index_map(); 105 } 106 GUARDED_VM_ENTRY( 107 ValueKlass* vklass = ValueKlass::cast(get_Klass()); 108 return vklass->field_offset(_field_index_map->at(index)); 109 ) 110 } 111 112 // Returns the field type of the field with the given index 113 ciType* ciValueKlass::field_type_by_index(int index) { 114 int offset = field_offset_by_index(index); 115 VM_ENTRY_MARK; 116 return get_field_type_by_offset(offset); 117 } 118 119 // Offset of the first field in the value type 120 int ciValueKlass::first_field_offset() const { 121 GUARDED_VM_ENTRY( 122 ValueKlass* vklass = ValueKlass::cast(get_Klass()); 123 return vklass->first_field_offset(); 124 ) 125 } 126 127 bool ciValueKlass::flatten_array() const { 128 GUARDED_VM_ENTRY( 129 ValueKlass* vklass = ValueKlass::cast(get_Klass()); 130 return vklass->flatten_array(); 131 ) 132 } 133 134 bool ciValueKlass::contains_oops() const { 135 GUARDED_VM_ENTRY( 136 ValueKlass* vklass = ValueKlass::cast(get_Klass()); 137 return vklass->contains_oops(); 138 ) 139 } 140 141 // When passing a value type's fields as arguments, count the number 142 // of argument slots that are needed 143 int ciValueKlass::value_arg_slots() { 144 int slots = nof_nonstatic_fields(); 145 for (int j = 0; j < nof_nonstatic_fields(); j++) { 146 ciField* f = nonstatic_field_at(j); 147 BasicType bt = f->type()->basic_type(); 148 assert(bt != T_VALUETYPE, "embedded"); 149 if (bt == T_LONG || bt == T_DOUBLE) { 150 slots++; 151 } 152 } 153 return slots; 154 } | 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/ciValueKlass.hpp" 28 #include "oops/valueKlass.hpp" 29 30 int ciValueKlass::compute_nonstatic_fields() { 31 int result = ciInstanceKlass::compute_nonstatic_fields(); 32 assert(super() == NULL || !super()->has_nonstatic_fields(), "a value type must not inherit fields from its superclass"); 33 34 // Compute declared non-static fields (without flattening of value type fields) 35 GrowableArray<ciField*>* fields = NULL; 36 GUARDED_VM_ENTRY(fields = compute_nonstatic_fields_impl(NULL, false /* no flattening */);) 37 Arena* arena = CURRENT_ENV->arena(); 38 _declared_nonstatic_fields = (fields != NULL) ? fields : new (arena) GrowableArray<ciField*>(arena, 0, 0, 0); 39 return result; 40 } 41 42 // Offset of the first field in the value type 43 int ciValueKlass::first_field_offset() const { 44 GUARDED_VM_ENTRY(return ValueKlass::cast(get_Klass())->first_field_offset();) 45 } 46 47 // Returns the index of the field with the given offset. If the field at 'offset' 48 // belongs to a flattened value type field, return the index of the field 49 // in the flattened value type. 50 int ciValueKlass::field_index_by_offset(int offset) { 51 assert(contains_field_offset(offset), "invalid field offset"); 52 int best_offset = 0; 53 int best_index = -1; 54 // Search the field with the given offset 55 for (int i = 0; i < nof_declared_nonstatic_fields(); ++i) { 56 int field_offset = _declared_nonstatic_fields->at(i)->offset(); 57 if (field_offset == offset) { 58 // Exact match 59 return i; 60 } else if (field_offset < offset && field_offset > best_offset) { 61 // No exact match. Save the index of the field with the closest offset that 62 // is smaller than the given field offset. This index corresponds to the 63 // flattened value type field that holds the field we are looking for. 64 best_offset = field_offset; 65 best_index = i; 66 } 67 } 68 assert(best_index >= 0, "field not found"); 69 assert(best_offset == offset || _declared_nonstatic_fields->at(best_index)->type()->is_valuetype(), "offset should match for non-VTs"); 70 return best_index; 71 } 72 73 // Are arrays containing this value type flattened? 74 bool ciValueKlass::flatten_array() const { 75 GUARDED_VM_ENTRY(return ValueKlass::cast(get_Klass())->flatten_array();) 76 } 77 78 // Can this value type be returned as multiple values? 79 bool ciValueKlass::can_be_returned_as_fields() const { 80 GUARDED_VM_ENTRY(return !is__Value() && ValueKlass::cast(get_Klass())->return_regs() != NULL;) 81 } 82 83 // When passing a value type's fields as arguments, count the number 84 // of argument slots that are needed 85 int ciValueKlass::value_arg_slots() { 86 int slots = nof_nonstatic_fields(); 87 for (int j = 0; j < nof_nonstatic_fields(); j++) { 88 ciField* f = nonstatic_field_at(j); 89 BasicType bt = f->type()->basic_type(); 90 // TODO re-enable when using T_VALUETYPEPTR 91 //assert(bt != T_VALUETYPE, "embedded"); 92 if (bt == T_LONG || bt == T_DOUBLE) { 93 slots++; 94 } 95 } 96 return slots; 97 } |