1 /*
2 * Copyright (c) 2015, 2016, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package java.lang;
26
27 import jdk.internal.misc.JavaLangInvokeAccess;
28 import jdk.internal.misc.SharedSecrets;
29
30 import static java.lang.StackWalker.Option.*;
31 import java.lang.StackWalker.StackFrame;
32 import java.lang.invoke.MethodType;
33
34 class StackFrameInfo implements StackFrame {
35 private final static JavaLangInvokeAccess JLIA =
36 SharedSecrets.getJavaLangInvokeAccess();
37
38 // Footprint improvement: MemberName::clazz can replace
39 // StackFrameInfo::declaringClass.
40
41 private final StackWalker walker;
42 private final Class<?> declaringClass;
43 private final Object memberName;
44 private final short bci;
45 private volatile StackTraceElement ste;
46
47 /*
48 * Create StackFrameInfo for StackFrameTraverser and LiveStackFrameTraverser
49 * to use
50 */
51 StackFrameInfo(StackWalker walker) {
52 this.walker = walker;
53 this.declaringClass = null;
54 this.bci = -1;
55 this.memberName = JLIA.newMemberName();
56 }
57
58 // package-private called by StackStreamFactory to skip
59 // the capability check
60 Class<?> declaringClass() {
61 return declaringClass;
62 }
63
64 // ----- implementation of StackFrame methods
65
66 @Override
67 public String getClassName() {
68 return declaringClass.getName();
69 }
70
71 @Override
72 public Class<?> getDeclaringClass() {
73 walker.ensureAccessEnabled(RETAIN_CLASS_REFERENCE);
74 return declaringClass;
75 }
76
77 @Override
78 public String getMethodName() {
79 return JLIA.getName(memberName);
80 }
81
82 @Override
83 public MethodType getMethodType() {
84 walker.ensureAccessEnabled(RETAIN_CLASS_REFERENCE);
85 return JLIA.getMethodType(memberName);
86 }
87
88 @Override
89 public String getDescriptor() {
90 return JLIA.getMethodDescriptor(memberName);
91 }
92
93 @Override
94 public int getByteCodeIndex() {
95 // bci not available for native methods
96 if (isNativeMethod())
97 return -1;
98
99 return bci;
100 }
101
102 @Override
103 public String getFileName() {
104 return toStackTraceElement().getFileName();
119 return JLIA.isNative(memberName);
120 }
121
122 @Override
123 public String toString() {
124 return toStackTraceElement().toString();
125 }
126
127 @Override
128 public StackTraceElement toStackTraceElement() {
129 StackTraceElement s = ste;
130 if (s == null) {
131 synchronized (this) {
132 s = ste;
133 if (s == null) {
134 ste = s = StackTraceElement.of(this);
135 }
136 }
137 }
138 return s;
139 }
140 }
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1 /*
2 * Copyright (c) 2015, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package java.lang;
26
27 import jdk.internal.misc.JavaLangInvokeAccess;
28 import jdk.internal.misc.SharedSecrets;
29
30 import static java.lang.StackWalker.Option.*;
31 import java.lang.StackWalker.StackFrame;
32 import java.lang.invoke.MethodType;
33
34 class StackFrameInfo implements StackFrame {
35 private final static JavaLangInvokeAccess JLIA =
36 SharedSecrets.getJavaLangInvokeAccess();
37
38 // Footprint improvement: MemberName::clazz can replace
39 // StackFrameInfo::declaringClass.
40
41 private final boolean retainClassRef;
42 private final Object memberName;
43 private final short bci;
44 private volatile StackTraceElement ste;
45
46 /*
47 * Create StackFrameInfo for StackFrameTraverser and LiveStackFrameTraverser
48 * to use
49 */
50 StackFrameInfo(StackWalker walker) {
51 this.retainClassRef = walker.retainClassRef;
52 this.bci = -1;
53 this.memberName = JLIA.newMemberName();
54 }
55
56 // package-private called by StackStreamFactory to skip
57 // the capability check
58 Class<?> declaringClass() {
59 return JLIA.getDeclaringClass(memberName);
60 }
61
62 // ----- implementation of StackFrame methods
63
64 @Override
65 public String getClassName() {
66 return declaringClass().getName();
67 }
68
69 @Override
70 public Class<?> getDeclaringClass() {
71 ensureRetainClassRefEnabled();
72 return declaringClass();
73 }
74
75 @Override
76 public String getMethodName() {
77 return JLIA.getName(memberName);
78 }
79
80 @Override
81 public MethodType getMethodType() {
82 ensureRetainClassRefEnabled();
83 return JLIA.getMethodType(memberName);
84 }
85
86 @Override
87 public String getDescriptor() {
88 return JLIA.getMethodDescriptor(memberName);
89 }
90
91 @Override
92 public int getByteCodeIndex() {
93 // bci not available for native methods
94 if (isNativeMethod())
95 return -1;
96
97 return bci;
98 }
99
100 @Override
101 public String getFileName() {
102 return toStackTraceElement().getFileName();
117 return JLIA.isNative(memberName);
118 }
119
120 @Override
121 public String toString() {
122 return toStackTraceElement().toString();
123 }
124
125 @Override
126 public StackTraceElement toStackTraceElement() {
127 StackTraceElement s = ste;
128 if (s == null) {
129 synchronized (this) {
130 s = ste;
131 if (s == null) {
132 ste = s = StackTraceElement.of(this);
133 }
134 }
135 }
136 return s;
137 }
138
139 private void ensureRetainClassRefEnabled() {
140 if (!retainClassRef) {
141 throw new UnsupportedOperationException("No access to RETAIN_CLASS_REFERENCE");
142 }
143 }
144 }
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