1 /* 2 * Copyright (c) 1999, 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 "classfile/javaClasses.inline.hpp" 27 #include "ci/ciConstant.hpp" 28 #include "ci/ciField.hpp" 29 #include "ci/ciInstance.hpp" 30 #include "ci/ciInstanceKlass.hpp" 31 #include "ci/ciUtilities.inline.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #include "oops/oop.inline.hpp" 34 35 // ciInstance 36 // 37 // This class represents an instanceOop in the HotSpot virtual 38 // machine. 39 40 // ------------------------------------------------------------------ 41 // ciObject::java_mirror_type 42 ciType* ciInstance::java_mirror_type() { 43 VM_ENTRY_MARK; 44 oop m = get_oop(); 45 // Return NULL if it is not java.lang.Class. 46 if (m == NULL || m->klass() != SystemDictionary::Class_klass()) { 47 return NULL; 48 } 49 // Return either a primitive type or a klass. 50 if (java_lang_Class::is_primitive(m)) { 51 return ciType::make(java_lang_Class::primitive_type(m)); 52 } else { 53 Klass* k = java_lang_Class::as_Klass(m); 54 assert(k != NULL, ""); 55 return CURRENT_THREAD_ENV->get_klass(k); 56 } 57 } 58 59 // ------------------------------------------------------------------ 60 // ciInstance::field_value_impl 61 ciConstant ciInstance::field_value_impl(BasicType field_btype, int offset) { 62 oop obj = get_oop(); 63 assert(obj != NULL, "bad oop"); 64 switch(field_btype) { 65 case T_BYTE: return ciConstant(field_btype, obj->byte_field(offset)); 66 case T_CHAR: return ciConstant(field_btype, obj->char_field(offset)); 67 case T_SHORT: return ciConstant(field_btype, obj->short_field(offset)); 68 case T_BOOLEAN: return ciConstant(field_btype, obj->bool_field(offset)); 69 case T_INT: return ciConstant(field_btype, obj->int_field(offset)); 70 case T_FLOAT: return ciConstant(obj->float_field(offset)); 71 case T_DOUBLE: return ciConstant(obj->double_field(offset)); 72 case T_LONG: return ciConstant(obj->long_field(offset)); 73 case T_VALUETYPE: // fall through 74 case T_OBJECT: // fall through 75 case T_ARRAY: { 76 oop o = obj->obj_field(offset); 77 78 // A field will be "constant" if it is known always to be 79 // a non-null reference to an instance of a particular class, 80 // or to a particular array. This can happen even if the instance 81 // or array is not perm. In such a case, an "unloaded" ciArray 82 // or ciInstance is created. The compiler may be able to use 83 // information about the object's class (which is exact) or length. 84 85 if (o == NULL) { 86 return ciConstant(field_btype, ciNullObject::make()); 87 } else { 88 return ciConstant(field_btype, CURRENT_ENV->get_object(o)); 89 } 90 } 91 default: 92 fatal("no field value: %s", type2name(field_btype)); 93 return ciConstant(); 94 } 95 } 96 97 // ------------------------------------------------------------------ 98 // ciInstance::field_value 99 // 100 // Constant value of a field. 101 ciConstant ciInstance::field_value(ciField* field) { 102 assert(is_loaded(), "invalid access - must be loaded"); 103 assert(field->holder()->is_loaded(), "invalid access - holder must be loaded"); 104 assert(field->is_static() || field->holder()->is_valuetype() || klass()->is_subclass_of(field->holder()), 105 "invalid access - must be subclass"); 106 107 GUARDED_VM_ENTRY(return field_value_impl(field->type()->basic_type(), field->offset());) 108 } 109 110 // ------------------------------------------------------------------ 111 // ciInstance::field_value_by_offset 112 // 113 // Constant value of a field at the specified offset. 114 ciConstant ciInstance::field_value_by_offset(int field_offset) { 115 ciInstanceKlass* ik = klass()->as_instance_klass(); 116 ciField* field = ik->get_field_by_offset(field_offset, false); 117 if (field == NULL) 118 return ciConstant(); // T_ILLEGAL 119 return field_value(field); 120 } 121 122 // ------------------------------------------------------------------ 123 // ciInstance::print_impl 124 // 125 // Implementation of the print method. 126 void ciInstance::print_impl(outputStream* st) { 127 st->print(" type="); 128 klass()->print(st); 129 } 130 131 132 ciKlass* ciInstance::java_lang_Class_klass() { 133 VM_ENTRY_MARK; 134 return CURRENT_ENV->get_metadata(java_lang_Class::as_Klass(get_oop()))->as_klass(); 135 }