ciType.cpp revision 5776:de6a9e811145 
1/*
2 * Copyright (c) 2000, 2013, 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/ciEnv.hpp"
27#include "ci/ciType.hpp"
28#include "ci/ciUtilities.hpp"
29#include "classfile/systemDictionary.hpp"
30#include "oops/oop.inline.hpp"
31
32ciType* ciType::_basic_types[T_CONFLICT+1];
33
34// ciType
35//
36// This class represents either a class (T_OBJECT), array (T_ARRAY),
37// or one of the primitive types such as T_INT.
38
39// ------------------------------------------------------------------
40// ciType::ciType
41//
42ciType::ciType(BasicType basic_type) : ciMetadata() {
43  assert(basic_type >= T_BOOLEAN && basic_type <= T_CONFLICT, "range check");
44  _basic_type = basic_type;
45}
46
47ciType::ciType(KlassHandle k) : ciMetadata(k()) {
48  _basic_type = k()->oop_is_array() ? T_ARRAY : T_OBJECT;
49}
50
51
52// ------------------------------------------------------------------
53// ciType::is_subtype_of
54//
55bool ciType::is_subtype_of(ciType* type) {
56  if (this == type)  return true;
57  if (is_klass() && type->is_klass())
58    return this->as_klass()->is_subtype_of(type->as_klass());
59  return false;
60}
61
62// ------------------------------------------------------------------
63// ciType::name
64//
65// Return the name of this type
66const char* ciType::name() {
67  if (is_primitive_type()) {
68    return type2name(basic_type());
69  } else {
70    assert(is_klass(), "must be");
71    return as_klass()->name()->as_utf8();
72  }
73}
74
75// ------------------------------------------------------------------
76// ciType::print_impl
77//
78// Implementation of the print method.
79void ciType::print_impl(outputStream* st) {
80  st->print(" type=");
81  print_name_on(st);
82}
83
84// ------------------------------------------------------------------
85// ciType::print_name
86//
87// Print the name of this type
88void ciType::print_name_on(outputStream* st) {
89  ResourceMark rm;
90  st->print(name());
91}
92
93
94
95// ------------------------------------------------------------------
96// ciType::java_mirror
97//
98ciInstance* ciType::java_mirror() {
99  VM_ENTRY_MARK;
100  return CURRENT_THREAD_ENV->get_instance(Universe::java_mirror(basic_type()));
101}
102
103// ------------------------------------------------------------------
104// ciType::box_klass
105//
106ciKlass* ciType::box_klass() {
107  if (!is_primitive_type())  return this->as_klass();  // reference types are "self boxing"
108
109  // Void is "boxed" with a null.
110  if (basic_type() == T_VOID)  return NULL;
111
112  VM_ENTRY_MARK;
113  return CURRENT_THREAD_ENV->get_instance_klass(SystemDictionary::box_klass(basic_type()));
114}
115
116
117// ------------------------------------------------------------------
118// ciType::make
119//
120// Produce the ciType for a given primitive BasicType.
121// As a bonus, produce the right reference type for T_OBJECT.
122// Does not work on T_ARRAY.
123ciType* ciType::make(BasicType t) {
124  // short, etc.
125  // Note: Bare T_ADDRESS means a raw pointer type, not a return_address.
126  assert((uint)t < T_CONFLICT+1, "range check");
127  if (t == T_OBJECT)  return ciEnv::_Object_klass;  // java/lang/Object
128  assert(_basic_types[t] != NULL, "domain check");
129  return _basic_types[t];
130}
131
132// ciReturnAddress
133//
134// This class represents the type of a specific return address in the
135// bytecodes.
136
137// ------------------------------------------------------------------
138// ciReturnAddress::ciReturnAddress
139//
140ciReturnAddress::ciReturnAddress(int bci) : ciType(T_ADDRESS) {
141  assert(0 <= bci, "bci cannot be negative");
142  _bci = bci;
143}
144
145// ------------------------------------------------------------------
146// ciReturnAddress::print_impl
147//
148// Implementation of the print method.
149void ciReturnAddress::print_impl(outputStream* st) {
150  st->print(" bci=%d", _bci);
151}
152
153// ------------------------------------------------------------------
154// ciReturnAddress::make
155ciReturnAddress* ciReturnAddress::make(int bci) {
156  GUARDED_VM_ENTRY(return CURRENT_ENV->get_return_address(bci);)
157}
158