ciInstance.cpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1999, 2005, 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 "incls/_precompiled.incl" 26#include "incls/_ciInstance.cpp.incl" 27 28// ciInstance 29// 30// This class represents an instanceOop in the HotSpot virtual 31// machine. 32 33// ------------------------------------------------------------------ 34// ciObject::java_mirror_type 35ciType* ciInstance::java_mirror_type() { 36 VM_ENTRY_MARK; 37 oop m = get_oop(); 38 // Return NULL if it is not java.lang.Class. 39 if (m == NULL || m->klass() != SystemDictionary::Class_klass()) { 40 return NULL; 41 } 42 // Return either a primitive type or a klass. 43 if (java_lang_Class::is_primitive(m)) { 44 return ciType::make(java_lang_Class::primitive_type(m)); 45 } else { 46 klassOop k = java_lang_Class::as_klassOop(m); 47 assert(k != NULL, ""); 48 return CURRENT_THREAD_ENV->get_object(k)->as_klass(); 49 } 50} 51 52// ------------------------------------------------------------------ 53// ciInstance::field_value 54// 55// Constant value of a field. 56ciConstant ciInstance::field_value(ciField* field) { 57 assert(is_loaded() && 58 field->holder()->is_loaded() && 59 klass()->is_subclass_of(field->holder()), 60 "invalid access"); 61 VM_ENTRY_MARK; 62 ciConstant result; 63 oop obj = get_oop(); 64 assert(obj != NULL, "bad oop"); 65 BasicType field_btype = field->type()->basic_type(); 66 int offset = field->offset(); 67 68 switch(field_btype) { 69 case T_BYTE: 70 return ciConstant(field_btype, obj->byte_field(offset)); 71 break; 72 case T_CHAR: 73 return ciConstant(field_btype, obj->char_field(offset)); 74 break; 75 case T_SHORT: 76 return ciConstant(field_btype, obj->short_field(offset)); 77 break; 78 case T_BOOLEAN: 79 return ciConstant(field_btype, obj->bool_field(offset)); 80 break; 81 case T_INT: 82 return ciConstant(field_btype, obj->int_field(offset)); 83 break; 84 case T_FLOAT: 85 return ciConstant(obj->float_field(offset)); 86 break; 87 case T_DOUBLE: 88 return ciConstant(obj->double_field(offset)); 89 break; 90 case T_LONG: 91 return ciConstant(obj->long_field(offset)); 92 break; 93 case T_OBJECT: 94 case T_ARRAY: 95 { 96 oop o = obj->obj_field(offset); 97 98 // A field will be "constant" if it is known always to be 99 // a non-null reference to an instance of a particular class, 100 // or to a particular array. This can happen even if the instance 101 // or array is not perm. In such a case, an "unloaded" ciArray 102 // or ciInstance is created. The compiler may be able to use 103 // information about the object's class (which is exact) or length. 104 105 if (o == NULL) { 106 return ciConstant(field_btype, ciNullObject::make()); 107 } else { 108 return ciConstant(field_btype, CURRENT_ENV->get_object(o)); 109 } 110 } 111 } 112 ShouldNotReachHere(); 113 // to shut up the compiler 114 return ciConstant(); 115} 116 117// ------------------------------------------------------------------ 118// ciInstance::field_value_by_offset 119// 120// Constant value of a field at the specified offset. 121ciConstant ciInstance::field_value_by_offset(int field_offset) { 122 ciInstanceKlass* ik = klass()->as_instance_klass(); 123 ciField* field = ik->get_field_by_offset(field_offset, false); 124 return field_value(field); 125} 126 127// ------------------------------------------------------------------ 128// ciInstance::print_impl 129// 130// Implementation of the print method. 131void ciInstance::print_impl(outputStream* st) { 132 st->print(" type="); 133 klass()->print(st); 134} 135