573 lines
23 KiB
Java
573 lines
23 KiB
Java
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/*
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* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang;
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import java.util.Objects;
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/**
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* An element in a stack trace, as returned by {@link
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* Throwable#getStackTrace()}. Each element represents a single stack frame.
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* All stack frames except for the one at the top of the stack represent
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* a method invocation. The frame at the top of the stack represents the
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* execution point at which the stack trace was generated. Typically,
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* this is the point at which the throwable corresponding to the stack trace
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* was created.
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*
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* @since 1.4
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* @author Josh Bloch
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*/
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public final class StackTraceElement implements java.io.Serializable {
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// For Throwables and StackWalker, the VM initially sets this field to a
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// reference to the declaring Class. The Class reference is used to
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// construct the 'format' bitmap, and then is cleared.
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//
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// For STEs constructed using the public constructors, this field is not used.
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// Android-removed: Remove classloader name and unsupported module name and version.
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// private transient Class<?> declaringClassObject;
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// Normally initialized by VM
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// Android-removed: Remove classloader name and unsupported module name and version.
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// private String classLoaderName;
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// private String moduleName;
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// private String moduleVersion;
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private String declaringClass;
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private String methodName;
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private String fileName;
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private int lineNumber;
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// Android-removed: Remove classloader name and unsupported module name and version.
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// private byte format = 0; // Default to show all
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// Android-changed: Remove javadoc related the unsupported module name and version.
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/**
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* Creates a stack trace element representing the specified execution
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* point.
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*
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* @param declaringClass the fully qualified name of the class containing
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* the execution point represented by the stack trace element
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* @param methodName the name of the method containing the execution point
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* represented by the stack trace element
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* @param fileName the name of the file containing the execution point
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* represented by the stack trace element, or {@code null} if
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* this information is unavailable
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* @param lineNumber the line number of the source line containing the
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* execution point represented by this stack trace element, or
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* a negative number if this information is unavailable. A value
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* of -2 indicates that the method containing the execution point
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* is a native method
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* @throws NullPointerException if {@code declaringClass} or
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* {@code methodName} is null
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* @since 1.5
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* @revised 9
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* @spec JPMS
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*/
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public StackTraceElement(String declaringClass, String methodName,
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String fileName, int lineNumber) {
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// Android-changed: Avoid dependency on module-related codes.
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// this(null, null, null, declaringClass, methodName, fileName, lineNumber);
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this.declaringClass = Objects.requireNonNull(declaringClass, "Declaring class is null");
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this.methodName = Objects.requireNonNull(methodName, "Method name is null");
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this.fileName = fileName;
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this.lineNumber = lineNumber;
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}
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// BEGIN Android-removed: Remove module-related methods.
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/*
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/**
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* Creates a stack trace element representing the specified execution
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* point.
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*
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* @param classLoaderName the class loader name if the class loader of
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* the class containing the execution point represented by
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* the stack trace is named; otherwise {@code null}
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* @param moduleName the module name if the class containing the
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* execution point represented by the stack trace is in a named
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* module; otherwise {@code null}
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* @param moduleVersion the module version if the class containing the
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* execution point represented by the stack trace is in a named
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* module that has a version; otherwise {@code null}
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* @param declaringClass the fully qualified name of the class containing
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* the execution point represented by the stack trace element
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* @param methodName the name of the method containing the execution point
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* represented by the stack trace element
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* @param fileName the name of the file containing the execution point
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* represented by the stack trace element, or {@code null} if
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* this information is unavailable
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* @param lineNumber the line number of the source line containing the
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* execution point represented by this stack trace element, or
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* a negative number if this information is unavailable. A value
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* of -2 indicates that the method containing the execution point
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* is a native method
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*
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* @throws NullPointerException if {@code declaringClass} is {@code null}
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* or {@code methodName} is {@code null}
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*
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* @since 9
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* @spec JPMS
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*
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public StackTraceElement(String classLoaderName,
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String moduleName, String moduleVersion,
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String declaringClass, String methodName,
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String fileName, int lineNumber) {
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this.classLoaderName = classLoaderName;
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this.moduleName = moduleName;
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this.moduleVersion = moduleVersion;
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this.declaringClass = Objects.requireNonNull(declaringClass, "Declaring class is null");
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this.methodName = Objects.requireNonNull(methodName, "Method name is null");
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this.fileName = fileName;
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this.lineNumber = lineNumber;
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}
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*/
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// END Android-removed: Remove module-related methods.
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/*
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* Private constructor for the factory methods to create StackTraceElement
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* for Throwable and StackFrameInfo
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*/
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private StackTraceElement() {}
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/**
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* Returns the name of the source file containing the execution point
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* represented by this stack trace element. Generally, this corresponds
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* to the {@code SourceFile} attribute of the relevant {@code class}
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* file (as per <i>The Java Virtual Machine Specification</i>, Section
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* 4.7.7). In some systems, the name may refer to some source code unit
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* other than a file, such as an entry in source repository.
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*
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* @return the name of the file containing the execution point
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* represented by this stack trace element, or {@code null} if
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* this information is unavailable.
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*/
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public String getFileName() {
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return fileName;
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}
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/**
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* Returns the line number of the source line containing the execution
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* point represented by this stack trace element. Generally, this is
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* derived from the {@code LineNumberTable} attribute of the relevant
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* {@code class} file (as per <i>The Java Virtual Machine
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* Specification</i>, Section 4.7.8).
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*
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* @return the line number of the source line containing the execution
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* point represented by this stack trace element, or a negative
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* number if this information is unavailable.
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*/
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public int getLineNumber() {
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return lineNumber;
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}
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// BEGIN Android-removed: Remove classloader name and module-related methods.
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/*
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/**
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* Returns the module name of the module containing the execution point
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* represented by this stack trace element.
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*
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* @return the module name of the {@code Module} containing the execution
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* point represented by this stack trace element; {@code null}
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* if the module name is not available.
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* @since 9
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* @spec JPMS
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* @see Module#getName()
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*
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public String getModuleName() {
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return moduleName;
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}
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/**
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* Returns the module version of the module containing the execution point
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* represented by this stack trace element.
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*
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* @return the module version of the {@code Module} containing the execution
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* point represented by this stack trace element; {@code null}
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* if the module version is not available.
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* @since 9
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* @spec JPMS
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* @see java.lang.module.ModuleDescriptor.Version
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*
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public String getModuleVersion() {
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return moduleVersion;
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}
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/**
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* Returns the name of the class loader of the class containing the
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* execution point represented by this stack trace element.
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*
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* @return the name of the class loader of the class containing the execution
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* point represented by this stack trace element; {@code null}
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* if the class loader is not named.
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*
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* @since 9
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* @spec JPMS
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* @see java.lang.ClassLoader#getName()
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*
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public String getClassLoaderName() {
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return classLoaderName;
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}
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*/
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// END Android-removed: Remove classloader name and module-related methods.
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/**
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* Returns the fully qualified name of the class containing the
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* execution point represented by this stack trace element.
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*
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* @return the fully qualified name of the {@code Class} containing
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* the execution point represented by this stack trace element.
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*/
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public String getClassName() {
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return declaringClass;
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}
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/**
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* Returns the name of the method containing the execution point
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* represented by this stack trace element. If the execution point is
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* contained in an instance or class initializer, this method will return
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* the appropriate <i>special method name</i>, {@code <init>} or
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* {@code <clinit>}, as per Section 3.9 of <i>The Java Virtual
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* Machine Specification</i>.
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*
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* @return the name of the method containing the execution point
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* represented by this stack trace element.
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*/
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public String getMethodName() {
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return methodName;
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}
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/**
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* Returns true if the method containing the execution point
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* represented by this stack trace element is a native method.
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*
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* @return {@code true} if the method containing the execution point
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* represented by this stack trace element is a native method.
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*/
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public boolean isNativeMethod() {
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return lineNumber == -2;
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}
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// Android-changed: Remove javadoc related to the module system.
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/**
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* Returns a string representation of this stack trace element.
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*
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* @apiNote The format of this string depends on the implementation, but the
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* following examples may be regarded as typical:
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* <ul>
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* <li>
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* {@code "MyClass.mash(MyClass.java:9)"} - Here, {@code "MyClass"}
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* is the <i>fully-qualified name</i> of the class containing the
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* execution point represented by this stack trace element,
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* {@code "mash"} is the name of the method containing the execution
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* point, {@code "MyClass.java"} is the source file containing the
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* execution point, and {@code "9"} is the line number of the source
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* line containing the execution point.
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* <li>
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* {@code "MyClass.mash(MyClass.java)"} - As above, but the line
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* number is unavailable.
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* <li>
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* {@code "MyClass.mash(Unknown Source)"} - As above, but neither
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* the file name nor the line number are available.
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* <li>
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* {@code "MyClass.mash(Native Method)"} - As above, but neither
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* the file name nor the line number are available, and the method
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* containing the execution point is known to be a native method.
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* </ul>
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*
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* <p> The {@code toString} method may return two different values on two
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* {@code StackTraceElement} instances that are
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* {@linkplain #equals(Object) equal}, for example one created via the
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* constructor, and one obtained from {@link java.lang.Throwable} or
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* {@link java.lang.StackWalker.StackFrame}, where an implementation may
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* choose to omit some element in the returned string.
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*
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* @revised 9
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* @spec JPMS
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* @see Throwable#printStackTrace()
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*/
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public String toString() {
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// BEGIN Android-changed: Fall back Unknown Source:<dex_pc> for unknown lineNumber.
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// http://b/30183883
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// The only behavior change is that "Unknown Source" is followed by a number
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// (the value of the dex program counter, dex_pc), which never occurs on the
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// RI. This value isn't a line number, but can be useful for debugging and
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// avoids the need to ship line number information along with the dex code to
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// get an accurate stack trace.
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// Formatting it in this way might be more digestible to automated tools that
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// are not specifically written to expect this behavior.
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/*
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String s = "";
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if (!dropClassLoaderName() && classLoaderName != null &&
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!classLoaderName.isEmpty()) {
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s += classLoaderName + "/";
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}
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if (moduleName != null && !moduleName.isEmpty()) {
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s += moduleName;
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if (!dropModuleVersion() && moduleVersion != null &&
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!moduleVersion.isEmpty()) {
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s += "@" + moduleVersion;
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}
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}
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s = s.isEmpty() ? declaringClass : s + "/" + declaringClass;
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return s + "." + methodName + "(" +
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(isNativeMethod() ? "Native Method)" :
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(fileName != null && lineNumber >= 0 ?
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fileName + ":" + lineNumber + ")" :
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(fileName != null ? ""+fileName+")" : "Unknown Source)")));
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*/
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StringBuilder result = new StringBuilder();
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result.append(getClassName()).append(".").append(methodName);
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if (isNativeMethod()) {
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result.append("(Native Method)");
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} else if (fileName != null) {
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if (lineNumber >= 0) {
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result.append("(").append(fileName).append(":").append(lineNumber).append(")");
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} else {
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result.append("(").append(fileName).append(")");
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}
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} else {
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if (lineNumber >= 0) {
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// The line number is actually the dex pc.
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result.append("(Unknown Source:").append(lineNumber).append(")");
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} else {
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result.append("(Unknown Source)");
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}
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}
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return result.toString();
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// END Android-changed: Fall back Unknown Source:<dex_pc> for unknown lineNumber.
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}
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|
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// Android-changed: Remove javadoc related to the module system.
|
||
|
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/**
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* Returns true if the specified object is another
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|
|
* {@code StackTraceElement} instance representing the same execution
|
||
|
|
* point as this instance. Two stack trace elements {@code a} and
|
||
|
|
* {@code b} are equal if and only if:
|
||
|
|
* <pre>{@code
|
||
|
|
* equals(a.getFileName(), b.getFileName()) &&
|
||
|
|
* a.getLineNumber() == b.getLineNumber()) &&
|
||
|
|
* equals(a.getClassName(), b.getClassName()) &&
|
||
|
|
* equals(a.getMethodName(), b.getMethodName())
|
||
|
|
* }</pre>
|
||
|
|
* where {@code equals} has the semantics of {@link
|
||
|
|
* java.util.Objects#equals(Object, Object) Objects.equals}.
|
||
|
|
*
|
||
|
|
* @param obj the object to be compared with this stack trace element.
|
||
|
|
* @return true if the specified object is another
|
||
|
|
* {@code StackTraceElement} instance representing the same
|
||
|
|
* execution point as this instance.
|
||
|
|
*
|
||
|
|
* @revised 9
|
||
|
|
* @spec JPMS
|
||
|
|
*/
|
||
|
|
public boolean equals(Object obj) {
|
||
|
|
if (obj==this)
|
||
|
|
return true;
|
||
|
|
if (!(obj instanceof StackTraceElement))
|
||
|
|
return false;
|
||
|
|
StackTraceElement e = (StackTraceElement)obj;
|
||
|
|
// Android-changed: Remove classloader name and module-related methods.
|
||
|
|
// return Objects.equals(classLoaderName, e.classLoaderName) &&
|
||
|
|
// Objects.equals(moduleName, e.moduleName) &&
|
||
|
|
// Objects.equals(moduleVersion, e.moduleVersion) &&
|
||
|
|
return
|
||
|
|
e.declaringClass.equals(declaringClass) &&
|
||
|
|
e.lineNumber == lineNumber &&
|
||
|
|
Objects.equals(methodName, e.methodName) &&
|
||
|
|
Objects.equals(fileName, e.fileName);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns a hash code value for this stack trace element.
|
||
|
|
*/
|
||
|
|
public int hashCode() {
|
||
|
|
int result = 31*declaringClass.hashCode() + methodName.hashCode();
|
||
|
|
// Android-changed: Remove classloader name and module-related methods.
|
||
|
|
// result = 31*result + Objects.hashCode(classLoaderName);
|
||
|
|
// result = 31*result + Objects.hashCode(moduleName);
|
||
|
|
// result = 31*result + Objects.hashCode(moduleVersion);
|
||
|
|
result = 31*result + Objects.hashCode(fileName);
|
||
|
|
result = 31*result + lineNumber;
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// BEGIN Android-removed: Remove classloader name and unsupported module name and version.
|
||
|
|
/*
|
||
|
|
/**
|
||
|
|
* Called from of() methods to set the 'format' bitmap using the Class
|
||
|
|
* reference stored in declaringClassObject, and then clear the reference.
|
||
|
|
*
|
||
|
|
* <p>
|
||
|
|
* If the module is a non-upgradeable JDK module, then set
|
||
|
|
* JDK_NON_UPGRADEABLE_MODULE to omit its version string.
|
||
|
|
* <p>
|
||
|
|
* If the loader is one of the built-in loaders (`boot`, `platform`, or `app`)
|
||
|
|
* then set BUILTIN_CLASS_LOADER to omit the first element (`<loader>/`).
|
||
|
|
*
|
||
|
|
private synchronized void computeFormat() {
|
||
|
|
try {
|
||
|
|
Class<?> cls = (Class<?>) declaringClassObject;
|
||
|
|
ClassLoader loader = cls.getClassLoader0();
|
||
|
|
Module m = cls.getModule();
|
||
|
|
byte bits = 0;
|
||
|
|
|
||
|
|
// First element - class loader name
|
||
|
|
// Call package-private ClassLoader::name method
|
||
|
|
|
||
|
|
if (loader instanceof BuiltinClassLoader) {
|
||
|
|
bits |= BUILTIN_CLASS_LOADER;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Second element - module name and version
|
||
|
|
|
||
|
|
// Omit if is a JDK non-upgradeable module (recorded in the hashes
|
||
|
|
// in java.base)
|
||
|
|
if (isHashedInJavaBase(m)) {
|
||
|
|
bits |= JDK_NON_UPGRADEABLE_MODULE;
|
||
|
|
}
|
||
|
|
format = bits;
|
||
|
|
} finally {
|
||
|
|
// Class reference no longer needed, clear it
|
||
|
|
declaringClassObject = null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private static final byte BUILTIN_CLASS_LOADER = 0x1;
|
||
|
|
private static final byte JDK_NON_UPGRADEABLE_MODULE = 0x2;
|
||
|
|
|
||
|
|
private boolean dropClassLoaderName() {
|
||
|
|
return (format & BUILTIN_CLASS_LOADER) == BUILTIN_CLASS_LOADER;
|
||
|
|
}
|
||
|
|
|
||
|
|
private boolean dropModuleVersion() {
|
||
|
|
return (format & JDK_NON_UPGRADEABLE_MODULE) == JDK_NON_UPGRADEABLE_MODULE;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns true if the module is hashed with java.base.
|
||
|
|
* <p>
|
||
|
|
* This method returns false when running on the exploded image
|
||
|
|
* since JDK modules are not hashed. They have no Version attribute
|
||
|
|
* and so "@<version>" part will be omitted anyway.
|
||
|
|
*
|
||
|
|
private static boolean isHashedInJavaBase(Module m) {
|
||
|
|
// return true if module system is not initialized as the code
|
||
|
|
// must be in java.base
|
||
|
|
if (!VM.isModuleSystemInited())
|
||
|
|
return true;
|
||
|
|
|
||
|
|
return ModuleLayer.boot() == m.getLayer() && HashedModules.contains(m);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Finds JDK non-upgradeable modules, i.e. the modules that are
|
||
|
|
* included in the hashes in java.base.
|
||
|
|
*
|
||
|
|
private static class HashedModules {
|
||
|
|
static Set<String> HASHED_MODULES = hashedModules();
|
||
|
|
|
||
|
|
static Set<String> hashedModules() {
|
||
|
|
|
||
|
|
Optional<ResolvedModule> resolvedModule = ModuleLayer.boot()
|
||
|
|
.configuration()
|
||
|
|
.findModule("java.base");
|
||
|
|
assert resolvedModule.isPresent();
|
||
|
|
ModuleReference mref = resolvedModule.get().reference();
|
||
|
|
assert mref instanceof ModuleReferenceImpl;
|
||
|
|
ModuleHashes hashes = ((ModuleReferenceImpl)mref).recordedHashes();
|
||
|
|
if (hashes != null) {
|
||
|
|
Set<String> names = new HashSet<>(hashes.names());
|
||
|
|
names.add("java.base");
|
||
|
|
return names;
|
||
|
|
}
|
||
|
|
|
||
|
|
return Set.of();
|
||
|
|
}
|
||
|
|
|
||
|
|
static boolean contains(Module m) {
|
||
|
|
return HASHED_MODULES.contains(m.getName());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
*/
|
||
|
|
// END Android-removed: Remove classloader name and unsupported module name and version.
|
||
|
|
|
||
|
|
// BEGIN Android-removed: code unused by Throwable in libcore.
|
||
|
|
/*
|
||
|
|
* Returns an array of StackTraceElements of the given depth
|
||
|
|
* filled from the backtrace of a given Throwable.
|
||
|
|
*
|
||
|
|
static StackTraceElement[] of(Throwable x, int depth) {
|
||
|
|
StackTraceElement[] stackTrace = new StackTraceElement[depth];
|
||
|
|
for (int i = 0; i < depth; i++) {
|
||
|
|
stackTrace[i] = new StackTraceElement();
|
||
|
|
}
|
||
|
|
|
||
|
|
// VM to fill in StackTraceElement
|
||
|
|
initStackTraceElements(stackTrace, x);
|
||
|
|
|
||
|
|
// ensure the proper StackTraceElement initialization
|
||
|
|
for (StackTraceElement ste : stackTrace) {
|
||
|
|
ste.computeFormat();
|
||
|
|
}
|
||
|
|
return stackTrace;
|
||
|
|
}
|
||
|
|
*/
|
||
|
|
// END Android-removed: code unused by Throwable in libcore.
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Returns a StackTraceElement from a given StackFrameInfo.
|
||
|
|
*/
|
||
|
|
static StackTraceElement of(StackFrameInfo sfi) {
|
||
|
|
// Android-changed: Simple java implementation without module name.
|
||
|
|
// StackTraceElement ste = new StackTraceElement();
|
||
|
|
// initStackTraceElement(ste, sfi);
|
||
|
|
StackTraceElement ste = new StackTraceElement(sfi.getClassName(), sfi.getMethodName(),
|
||
|
|
sfi.getFileName(), sfi.getLineNumber());
|
||
|
|
|
||
|
|
// Android-removed: Remove classloader name and unsupported module name and version.
|
||
|
|
// ste.computeFormat();
|
||
|
|
return ste;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Sets the given stack trace elements with the backtrace
|
||
|
|
* of the given Throwable.
|
||
|
|
*/
|
||
|
|
// Android-removed: code unused by Throwable in libcore.
|
||
|
|
// private static native void initStackTraceElements(StackTraceElement[] elements,
|
||
|
|
// Throwable x);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Sets the given stack trace element with the given StackFrameInfo
|
||
|
|
*/
|
||
|
|
// Android-removed: unused dead code.
|
||
|
|
// private static native void initStackTraceElement(StackTraceElement element,
|
||
|
|
// StackFrameInfo sfi);
|
||
|
|
|
||
|
|
private static final long serialVersionUID = 6992337162326171013L;
|
||
|
|
}
|