1 /*
2 * Copyright (c) 1999, 2020, 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/ciUtilities.inline.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "runtime/signature.hpp"
33
34 // ciSignature
35 //
36 // This class represents the signature of a method.
37
38 // ------------------------------------------------------------------
39 // ciSignature::ciSignature
40 ciSignature::ciSignature(ciKlass* accessing_klass, const constantPoolHandle& cpool, ciSymbol* symbol)
41 : _symbol(symbol), _accessing_klass(accessing_klass), _types(CURRENT_ENV->arena(), 8, 0, NULL) {
42 ASSERT_IN_VM;
43 EXCEPTION_CONTEXT;
44 assert(accessing_klass != NULL, "need origin of access");
45
46 ciEnv* env = CURRENT_ENV;
47
48 int size = 0;
49 int count = 0;
50 ResourceMark rm(THREAD);
51 Symbol* sh = symbol->get_symbol();
52 SignatureStream ss(sh);
53 for (; ; ss.next()) {
54 // Process one element of the signature
55 ciType* type;
56 if (!ss.is_reference()) {
57 type = ciType::make(ss.type());
58 } else {
59 ciSymbol* klass_name = env->get_symbol(ss.as_symbol());
60 type = env->get_klass_by_name_impl(_accessing_klass, cpool, klass_name, false);
61 }
62 if (ss.at_return_type()) {
63 // don't include return type in size calculation
64 _return_type = type;
65 break;
66 }
67 if (type->is_inlinetype() && ss.has_Q_descriptor()) {
68 type = env->make_null_free_wrapper(type);
69 }
70 _types.append(type);
71 size += type->size();
72 }
73 _size = size;
74 }
75
76 // ------------------------------------------------------------------
77 // ciSignature::returns_null_free_inline_type
78 bool ciSignature::returns_null_free_inline_type() const {
79 GUARDED_VM_ENTRY(return get_symbol()->is_Q_method_signature();)
80 }
81
82 // ------------------------------------------------------------------
83 // ciSignature::is_null_free_at
84 //
85 // True if we know that the argument at 'index' is null-free.
86 bool ciSignature::is_null_free_at(int index) const {
87 return _types.at(index)->is_null_free();
88 }
89
90 // ------------------------------------------------------------------
91 // ciSignature::equals
92 //
93 // Compare this signature to another one. Signatures with different
94 // accessing classes but with signature-types resolved to the same
95 // types are defined to be equal.
96 bool ciSignature::equals(ciSignature* that) {
97 // Compare signature
98 if (!this->as_symbol()->equals(that->as_symbol())) {
99 return false;
100 }
101 // Compare all types of the arguments
102 if (_types.length() != that->_types.length()) {
103 return false;
104 }
105 for (int i = 0; i < _types.length(); i++) {
106 if (this->type_at(i) != that->type_at(i)) {
107 return false;
108 }
109 }
110 // Compare the return type
111 if (this->return_type() != that->return_type()) {
112 return false;
113 }
114 return true;
115 }
116
117 // ------------------------------------------------------------------
118 // ciSignature::print_signature
119 void ciSignature::print_signature() {
120 _symbol->print_symbol();
121 }
122
123 // ------------------------------------------------------------------
124 // ciSignature::print
125 void ciSignature::print() {
126 tty->print("<ciSignature symbol=");
127 print_signature();
128 tty->print(" accessing_klass=");
129 _accessing_klass->print();
130 tty->print(" address=" INTPTR_FORMAT ">", p2i((address)this));
131 }