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8023228: Debugger information gather is too slow
Reviewed-by: sundar, lagergren
This commit is contained in:
James Laskey
Jim Laskey
parent
863bbb911b
commit
5d8a44e119
@ -91,6 +91,11 @@ public final class Context {
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*/
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public static final String NASHORN_JAVA_REFLECTION = "nashorn.JavaReflection";
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/* Force DebuggerSupport to be loaded. */
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static {
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DebuggerSupport.FORCELOAD = true;
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}
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/**
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* ContextCodeInstaller that has the privilege of installing classes in the Context.
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* Can only be instantiated from inside the context and is opaque to other classes
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310
nashorn/src/jdk/nashorn/internal/runtime/DebuggerSupport.java
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310
nashorn/src/jdk/nashorn/internal/runtime/DebuggerSupport.java
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@ -0,0 +1,310 @@
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/*
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* Copyright (c) 2010, 2013, 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 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 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 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 jdk.nashorn.internal.runtime;
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import java.util.HashSet;
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import java.util.Set;
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/**
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* This class provides support for external debuggers. Its primary purpose is
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* is to simplify the debugger tasks and provide better performance.
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*/
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final class DebuggerSupport {
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/**
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* Hook to force the loading of the DebuggerSupport class so that it is
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* available to external debuggers.
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*/
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static boolean FORCELOAD = true;
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static {
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/**
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* Hook to force the loading of the DebuggerValueDesc class so that it is
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* available to external debuggers.
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*/
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DebuggerValueDesc forceLoad = new DebuggerValueDesc(null, false, null, null);
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}
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/** This class is used to send a bulk description of a value. */
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static class DebuggerValueDesc {
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/** Property key (or index) or field name. */
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final String key;
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/** If the value is expandable. */
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final boolean expandable;
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/** Property or field value as object. */
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final Object valueAsObject;
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/** Property or field value as string. */
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final String valueAsString;
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DebuggerValueDesc(final String key, final boolean expandable, final Object valueAsObject, final String valueAsString) {
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this.key = key;
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this.expandable = expandable;
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this.valueAsObject = valueAsObject;
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this.valueAsString = valueAsString;
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}
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}
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/**
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* Return the current context global.
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* @return context global.
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*/
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static Object getGlobal() {
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return Context.getGlobalTrusted();
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}
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/**
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* This method returns a bulk description of an object's properties.
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* @param object Script object to be displayed by the debugger.
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* @param all true if to include non-enumerable values.
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* @return An array of DebuggerValueDesc.
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*/
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static DebuggerValueDesc[] valueInfos(final Object object, final boolean all) {
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assert object instanceof ScriptObject;
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return getDebuggerValueDescs((ScriptObject)object, all, new HashSet<>());
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}
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/**
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* This method returns a debugger description of the value.
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* @param name Name of value (property name).
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* @param value Data value.
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* @param all true if to include non-enumerable values.
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* @return A DebuggerValueDesc.
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*/
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static DebuggerValueDesc valueInfo(final String name, final Object value, final boolean all) {
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return valueInfo(name, value, all, new HashSet<>());
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}
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/**
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* This method returns a debugger description of the value.
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* @param name Name of value (property name).
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* @param value Data value.
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* @param all true if to include non-enumerable values.
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* @param duplicates Duplication set to avoid cycles.
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* @return A DebuggerValueDesc.
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*/
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private static DebuggerValueDesc valueInfo(final String name, final Object value, final boolean all, final Set<Object> duplicates) {
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if (value instanceof ScriptObject && !(value instanceof ScriptFunction)) {
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final ScriptObject object = (ScriptObject)value;
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return new DebuggerValueDesc(name, !object.isEmpty(), value, objectAsString(object, all, duplicates));
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} else {
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return new DebuggerValueDesc(name, false, value, valueAsString(value));
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}
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}
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/**
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* Generate the descriptions for an object's properties.
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* @param object Object to introspect.
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* @param all true if to include non-enumerable values.
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* @param duplicates Duplication set to avoid cycles.
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* @return An array of DebuggerValueDesc.
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*/
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private static DebuggerValueDesc[] getDebuggerValueDescs(final ScriptObject object, final boolean all, final Set<Object> duplicates) {
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if (duplicates.contains(object)) {
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return null;
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}
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duplicates.add(object);
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final String[] keys = object.getOwnKeys(all);
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final DebuggerValueDesc[] descs = new DebuggerValueDesc[keys.length];
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for (int i = 0; i < keys.length; i++) {
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final String key = keys[i];
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descs[i] = valueInfo(key, object.get(key), true, duplicates);
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}
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duplicates.remove(object);
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return descs;
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}
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/**
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* Generate a string representation of a Script object.
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* @param object Script object to represent.
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* @param all true if to include non-enumerable values.
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* @param duplicates Duplication set to avoid cycles.
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* @return String representation.
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*/
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private static String objectAsString(final ScriptObject object, final boolean all, final Set<Object> duplicates) {
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final StringBuilder sb = new StringBuilder();
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if (ScriptObject.isArray(object)) {
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sb.append('[');
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final long length = object.getLong("length");
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for (long i = 0; i < length; i++) {
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if (object.has(i)) {
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final Object valueAsObject = object.get(i);
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final boolean isUndefined = JSType.of(valueAsObject) == JSType.UNDEFINED;
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if (isUndefined) {
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if (i != 0) {
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sb.append(",");
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}
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} else {
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if (i != 0) {
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sb.append(", ");
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}
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if (valueAsObject instanceof ScriptObject && !(valueAsObject instanceof ScriptFunction)) {
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final String objectString = objectAsString((ScriptObject)valueAsObject, true, duplicates);
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sb.append(objectString != null ? objectString : "{...}");
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} else {
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sb.append(valueAsString(valueAsObject));
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}
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}
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} else {
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if (i != 0) {
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sb.append(',');
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}
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}
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}
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sb.append(']');
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} else {
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sb.append('{');
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final DebuggerValueDesc[] descs = getDebuggerValueDescs(object, all, duplicates);
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if (descs != null) {
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for (int i = 0; i < descs.length; i++) {
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if (i != 0) {
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sb.append(", ");
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}
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final String valueAsString = descs[i].valueAsString;
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sb.append(descs[i].key);
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sb.append(": ");
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sb.append(descs[i].valueAsString);
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}
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}
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sb.append('}');
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}
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return sb.toString();
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}
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/**
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* This method returns a string representation of a value.
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* @param value Arbitrary value to be displayed by the debugger.
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* @return A string representation of the value or an array of DebuggerValueDesc.
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*/
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private static String valueAsString(final Object value) {
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final JSType type = JSType.of(value);
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switch (type) {
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case BOOLEAN:
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return value.toString();
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case STRING:
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return escape((String)value);
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case NUMBER:
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return JSType.toString(((Number)value).doubleValue());
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case NULL:
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return "null";
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case UNDEFINED:
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return "undefined";
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case OBJECT:
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return ScriptRuntime.safeToString(value);
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case FUNCTION:
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if (value instanceof ScriptFunction) {
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return ((ScriptFunction)value).toSource();
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} else {
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return value.toString();
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}
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default:
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return value.toString();
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}
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}
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/**
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* Escape a string into a form that can be parsed by JavaScript.
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* @param value String to be escaped.
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* @return Escaped string.
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*/
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private static String escape(final String value) {
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final StringBuilder sb = new StringBuilder();
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sb.append("\"");
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for (final char ch : value.toCharArray()) {
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switch (ch) {
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case '\\':
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sb.append("\\\\");
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break;
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case '"':
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sb.append("\\\"");
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break;
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case '\'':
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sb.append("\\\'");
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break;
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case '\b':
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sb.append("\\b");
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break;
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case '\f':
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sb.append("\\f");
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break;
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case '\n':
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sb.append("\\n");
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break;
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case '\r':
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sb.append("\\r");
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break;
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case '\t':
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sb.append("\\t");
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break;
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default:
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if (ch < ' ' || ch >= 0xFF) {
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sb.append("\\u");
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final String hex = Integer.toHexString(ch);
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for (int i = hex.length(); i < 4; i++) {
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sb.append('0');
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}
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sb.append(hex);
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} else {
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sb.append(ch);
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}
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break;
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}
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}
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sb.append("\"");
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return sb.toString();
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}
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}
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