1 /*
2 * Copyright (c) 1999, 2023, 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/ciMethodType.hpp"
27 #include "ci/ciSignature.hpp"
28 #include "ci/ciStreams.hpp"
29 #include "ci/ciUtilities.inline.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "runtime/signature.hpp"
34
35 // ciSignature
36 //
37 // This class represents the signature of a method.
38
39 // ------------------------------------------------------------------
40 // ciSignature::ciSignature
41 ciSignature::ciSignature(ciKlass* accessing_klass, const constantPoolHandle& cpool, ciSymbol* symbol)
42 : _symbol(symbol), _accessing_klass(accessing_klass), _types(CURRENT_ENV->arena(), 8, 0, nullptr) {
43 ASSERT_IN_VM;
44 EXCEPTION_CONTEXT;
45 assert(accessing_klass != nullptr, "need origin of access");
46
47 ciEnv* env = CURRENT_ENV;
48
49 int size = 0;
50 ResourceMark rm(THREAD);
51 for (SignatureStream ss(symbol->get_symbol()); !ss.is_done(); ss.next()) {
52 // Process one element of the signature
53 ciType* type = nullptr;
54 if (ss.is_reference()) {
55 ciSymbol* klass_name = env->get_symbol(ss.as_symbol());
56 type = env->get_klass_by_name_impl(_accessing_klass, cpool, klass_name, false);
57 } else {
58 type = ciType::make(ss.type());
59 }
60 if (ss.at_return_type()) {
61 // don't include return type in size calculation
62 _return_type = type;
63 } else {
64 _types.append(type);
65 size += type->size();
66 }
67 }
68 _size = size;
69 }
70
71 // ------------------------------------------------------------------
72 // ciSignature::equals
73 //
74 // Compare this signature to another one. Signatures with different
75 // accessing classes but with signature-types resolved to the same
76 // types are defined to be equal.
77 bool ciSignature::equals(ciSignature* that) {
78 // Compare signature
79 if (!this->as_symbol()->equals(that->as_symbol())) {
80 return false;
81 }
82 // Compare all types of the arguments
83 if (_types.length() != that->_types.length()) {
84 return false;
85 }
86 for (int i = 0; i < _types.length(); i++) {
87 if (this->type_at(i) != that->type_at(i)) {
88 return false;
89 }
90 }
91 // Compare the return type
92 if (this->return_type() != that->return_type()) {
93 return false;
94 }
95 return true;
96 }
97
98 // ------------------------------------------------------------------
99 // ciSignature::has_unloaded_classes
100 //
101 // Reports if there are any unloaded classes present in the signature.
102 // Each ciSignature when instantiated is resolved against some accessing class
103 // and the resolved classes aren't required to be local, but can be revealed
104 // through loader constraints.
105 bool ciSignature::has_unloaded_classes() {
106 for (ciSignatureStream str(this); !str.is_done(); str.next()) {
107 if (!str.type()->is_loaded()) {
108 return true;
109 }
110 }
111 return false;
112 }
113
114 // ------------------------------------------------------------------
115 // ciSignature::print_signature
116 void ciSignature::print_signature() {
117 _symbol->print_symbol();
118 }
119
120 // ------------------------------------------------------------------
121 // ciSignature::print
122 void ciSignature::print() {
123 tty->print("<ciSignature symbol=");
124 print_signature();
125 tty->print(" accessing_klass=");
126 _accessing_klass->print();
127 tty->print(" address=" INTPTR_FORMAT ">", p2i((address)this));
128 }