Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/jdi/ConnectorImpl.java @ 7353:b5280041f59e
Experiment with soft alignment for branch targets.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sun, 13 Jan 2013 19:32:16 +0100 |
parents | 970cbbba54b0 |
children |
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/* * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ package sun.jvm.hotspot.jdi; import com.sun.jdi.connect.*; import com.sun.jdi.InternalException; import java.io.*; import java.lang.ref.*; import java.lang.reflect.*; import java.util.*; abstract class ConnectorImpl implements Connector { Map defaultArguments = new LinkedHashMap(); // Used by BooleanArgument static String trueString = null; static String falseString; /** This is not public in VirtualMachineManagerImpl ThreadGroup mainGroupForJDI() { return ((VirtualMachineManagerImpl)manager).mainGroupForJDI(); } ***/ // multiple debuggee support for SA/JDI private static List freeVMClasses; // List<SoftReference<Class>> private static ClassLoader myLoader; // debug mode for SA/JDI connectors static final protected boolean DEBUG; static { myLoader = ConnectorImpl.class.getClassLoader(); freeVMClasses = new ArrayList(0); DEBUG = System.getProperty("sun.jvm.hotspot.jdi.ConnectorImpl.DEBUG") != null; } // add a new free VirtualMachineImpl class private static synchronized void addFreeVMImplClass(Class clazz) { if (DEBUG) { System.out.println("adding free VirtualMachineImpl class"); } freeVMClasses.add(new SoftReference(clazz)); } // returns null if we don't have anything free private static synchronized Class getFreeVMImplClass() { while (!freeVMClasses.isEmpty()) { SoftReference ref = (SoftReference) freeVMClasses.remove(0); Object o = ref.get(); if (o != null) { if (DEBUG) { System.out.println("re-using loaded VirtualMachineImpl"); } return (Class) o; } } return null; } private static Class getVMImplClassFrom(ClassLoader cl) throws ClassNotFoundException { return Class.forName("sun.jvm.hotspot.jdi.VirtualMachineImpl", true, cl); } /* SA has not been designed to support multiple debuggee VMs * at-a-time. But, JDI supports multiple debuggee VMs. We * support multiple debuggee VMs in SA/JDI, by creating a new * class loader instance (refer to comment in SAJDIClassLoader * for details). But, to avoid excessive class loading (and * thereby resulting in larger footprint), we re-use 'dispose'd * VirtualMachineImpl classes. */ protected static Class loadVirtualMachineImplClass() throws ClassNotFoundException { Class vmImplClass = getFreeVMImplClass(); if (vmImplClass == null) { ClassLoader cl = new SAJDIClassLoader(myLoader); vmImplClass = getVMImplClassFrom(cl); } return vmImplClass; } /* We look for System property sun.jvm.hotspot.jdi.<vm version>. * This property should have the value of JDK HOME directory for * the given <vm version>. */ private static String getSAClassPathForVM(String vmVersion) { final String prefix = "sun.jvm.hotspot.jdi."; // look for exact match of VM version String jvmHome = System.getProperty(prefix + vmVersion); if (DEBUG) { System.out.println("looking for System property " + prefix + vmVersion); } if (jvmHome == null) { // omit chars after first '-' in VM version and try // for example, in '1.5.0-b55' we take '1.5.0' int index = vmVersion.indexOf('-'); if (index != -1) { vmVersion = vmVersion.substring(0, index); if (DEBUG) { System.out.println("looking for System property " + prefix + vmVersion); } jvmHome = System.getProperty(prefix + vmVersion); } if (jvmHome == null) { // System property is not set if (DEBUG) { System.out.println("can't locate JDK home for " + vmVersion); } return null; } } if (DEBUG) { System.out.println("JDK home for " + vmVersion + " is " + jvmHome); } // sa-jdi is in $JDK_HOME/lib directory StringBuffer buf = new StringBuffer(); buf.append(jvmHome); buf.append(File.separatorChar); buf.append("lib"); buf.append(File.separatorChar); buf.append("sa-jdi.jar"); return buf.toString(); } /* This method loads VirtualMachineImpl class by a ClassLoader * configured with sa-jdi.jar path of given 'vmVersion'. This is * used for cross VM version debugging. Refer to comments in * SAJDIClassLoader as well. */ protected static Class loadVirtualMachineImplClass(String vmVersion) throws ClassNotFoundException { if (DEBUG) { System.out.println("attemping to load sa-jdi.jar for version " + vmVersion); } String classPath = getSAClassPathForVM(vmVersion); if (classPath != null) { ClassLoader cl = new SAJDIClassLoader(myLoader, classPath); return getVMImplClassFrom(cl); } else { return null; } } /* Is the given throwable an instanceof VMVersionMismatchException? * Note that we can't do instanceof check because the exception * class might have been loaded by a different class loader. */ private static boolean isVMVersionMismatch(Throwable throwable) { String className = throwable.getClass().getName(); return className.equals("sun.jvm.hotspot.runtime.VMVersionMismatchException"); } /* gets target VM version from the given VMVersionMismatchException. * Note that we need to reflectively call the method because of we may * have got this from different classloader's namespace */ private static String getVMVersion(Throwable throwable) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException { // assert isVMVersionMismatch(throwable), "not a VMVersionMismatch" Class expClass = throwable.getClass(); Method targetVersionMethod = expClass.getMethod("getTargetVersion", new Class[0]); return (String) targetVersionMethod.invoke(throwable); } /** If the causal chain has a sun.jvm.hotspot.runtime.VMVersionMismatchException, attempt to load VirtualMachineImpl class for target VM version. */ protected static Class handleVMVersionMismatch(InvocationTargetException ite) { Throwable cause = ite.getCause(); if (DEBUG) { System.out.println("checking for version mismatch..."); } while (cause != null) { try { if (isVMVersionMismatch(cause)) { if (DEBUG) { System.out.println("Triggering cross VM version support..."); } return loadVirtualMachineImplClass(getVMVersion(cause)); } } catch (Exception exp) { if (DEBUG) { System.out.println("failed to load VirtualMachineImpl class"); exp.printStackTrace(); } return null; } cause = cause.getCause(); } return null; } protected void checkNativeLink(SecurityManager sm, String os) { if (os.equals("SunOS") || os.equals("Linux") || os.contains("OS X")) { // link "saproc" - SA native library on SunOS, Linux, and Mac OS X sm.checkLink("saproc"); } else if (os.startsWith("Windows")) { // link "sawindbg" - SA native library on Windows. sm.checkLink("sawindbg"); } else { throw new RuntimeException(os + " is not yet supported"); } } // we set an observer to detect VirtualMachineImpl.dispose call // and on dispose we add corresponding VirtualMachineImpl.class to // free VirtualMachimeImpl Class list. protected static void setVMDisposeObserver(final Object vm) { try { Method setDisposeObserverMethod = vm.getClass().getDeclaredMethod("setDisposeObserver", new Class[] { java.util.Observer.class }); setDisposeObserverMethod.setAccessible(true); setDisposeObserverMethod.invoke(vm, new Object[] { new Observer() { public void update(Observable o, Object data) { if (DEBUG) { System.out.println("got VM.dispose notification"); } addFreeVMImplClass(vm.getClass()); } } }); } catch (Exception exp) { if (DEBUG) { System.out.println("setVMDisposeObserver() got an exception:"); exp.printStackTrace(); } } } public Map defaultArguments() { Map defaults = new LinkedHashMap(); Collection values = defaultArguments.values(); Iterator iter = values.iterator(); while (iter.hasNext()) { ArgumentImpl argument = (ArgumentImpl)iter.next(); defaults.put(argument.name(), argument.clone()); } return defaults; } void addStringArgument(String name, String label, String description, String defaultValue, boolean mustSpecify) { defaultArguments.put(name, new StringArgumentImpl(name, label, description, defaultValue, mustSpecify)); } void addBooleanArgument(String name, String label, String description, boolean defaultValue, boolean mustSpecify) { defaultArguments.put(name, new BooleanArgumentImpl(name, label, description, defaultValue, mustSpecify)); } void addIntegerArgument(String name, String label, String description, String defaultValue, boolean mustSpecify, int min, int max) { defaultArguments.put(name, new IntegerArgumentImpl(name, label, description, defaultValue, mustSpecify, min, max)); } void addSelectedArgument(String name, String label, String description, String defaultValue, boolean mustSpecify, List list) { defaultArguments.put(name, new SelectedArgumentImpl(name, label, description, defaultValue, mustSpecify, list)); } ArgumentImpl argument(String name, Map arguments) throws IllegalConnectorArgumentsException { ArgumentImpl argument = (ArgumentImpl)arguments.get(name); if (argument == null) { throw new IllegalConnectorArgumentsException( "Argument missing", name); } String value = argument.value(); if (value == null || value.length() == 0) { if (argument.mustSpecify()) { throw new IllegalConnectorArgumentsException( "Argument unspecified", name); } } else if(!argument.isValid(value)) { throw new IllegalConnectorArgumentsException( "Argument invalid", name); } return argument; } String getString(String key) { //fixme jjh; needs i18n // this is not public return ((VirtualMachineManagerImpl)manager).getString(key); return key; } public String toString() { String string = name() + " (defaults: "; Iterator iter = defaultArguments().values().iterator(); boolean first = true; while (iter.hasNext()) { ArgumentImpl argument = (ArgumentImpl)iter.next(); if (!first) { string += ", "; } string += argument.toString(); first = false; } return string + ")"; } abstract class ArgumentImpl implements Connector.Argument, Cloneable, Serializable { private String name; private String label; private String description; private String value; private boolean mustSpecify; ArgumentImpl(String name, String label, String description, String value, boolean mustSpecify) { this.name = name; this.label = label; this.description = description; this.value = value; this.mustSpecify = mustSpecify; } public abstract boolean isValid(String value); public String name() { return name; } public String label() { return label; } public String description() { return description; } public String value() { return value; } public void setValue(String value) { if (value == null) { throw new NullPointerException("Can't set null value"); } this.value = value; } public boolean mustSpecify() { return mustSpecify; } public boolean equals(Object obj) { if ((obj != null) && (obj instanceof Connector.Argument)) { Connector.Argument other = (Connector.Argument)obj; return (name().equals(other.name())) && (description().equals(other.description())) && (mustSpecify() == other.mustSpecify()) && (value().equals(other.value())); } else { return false; } } public int hashCode() { return description().hashCode(); } public Object clone() { try { return super.clone(); } catch (CloneNotSupportedException e) { // Object should always support clone throw (InternalException) new InternalException().initCause(e); } } public String toString() { return name() + "=" + value(); } } class BooleanArgumentImpl extends ConnectorImpl.ArgumentImpl implements Connector.BooleanArgument { BooleanArgumentImpl(String name, String label, String description, boolean value, boolean mustSpecify) { super(name, label, description, null, mustSpecify); if(trueString == null) { trueString = getString("true"); falseString = getString("false"); } setValue(value); } /** * Sets the value of the argument. */ public void setValue(boolean value) { setValue(stringValueOf(value)); } /** * Performs basic sanity check of argument. * @return <code>true</code> if value is a string * representation of a boolean value. * @see #stringValueOf(boolean) */ public boolean isValid(String value) { return value.equals(trueString) || value.equals(falseString); } /** * Return the string representation of the <code>value</code> * parameter. * Does not set or examine the value or the argument. * @return the localized String representation of the * boolean value. */ public String stringValueOf(boolean value) { return value? trueString : falseString; } /** * Return the value of the argument as a boolean. Since * the argument may not have been set or may have an invalid * value {@link #isValid(String)} should be called on * {@link #value()} to check its validity. If it is invalid * the boolean returned by this method is undefined. * @return the value of the argument as a boolean. */ public boolean booleanValue() { return value().equals(trueString); } } class IntegerArgumentImpl extends ConnectorImpl.ArgumentImpl implements Connector.IntegerArgument { private final int min; private final int max; IntegerArgumentImpl(String name, String label, String description, String value, boolean mustSpecify, int min, int max) { super(name, label, description, value, mustSpecify); this.min = min; this.max = max; } /** * Sets the value of the argument. * The value should be checked with {@link #isValid(int)} * before setting it; invalid values will throw an exception * when the connection is established - for example, * on {@link LaunchingConnector#launch} */ public void setValue(int value) { setValue(stringValueOf(value)); } /** * Performs basic sanity check of argument. * @return <code>true</code> if value represents an int that is * <code>{@link #min()} <= value <= {@link #max()}</code> */ public boolean isValid(String value) { if (value == null) { return false; } try { return isValid(Integer.decode(value).intValue()); } catch(NumberFormatException exc) { return false; } } /** * Performs basic sanity check of argument. * @return <code>true</code> if * <code>{@link #min()} <= value <= {@link #max()}</code> */ public boolean isValid(int value) { return min <= value && value <= max; } /** * Return the string representation of the <code>value</code> * parameter. * Does not set or examine the value or the argument. * @return the String representation of the * int value. */ public String stringValueOf(int value) { // *** Should this be internationalized???? // *** Even Brian Beck was unsure if an Arabic programmer // *** would expect port numbers in Arabic numerals, // *** so punt for now. return ""+value; } /** * Return the value of the argument as a int. Since * the argument may not have been set or may have an invalid * value {@link #isValid(String)} should be called on * {@link #value()} to check its validity. If it is invalid * the int returned by this method is undefined. * @return the value of the argument as a int. */ public int intValue() { if (value() == null) { return 0; } try { return Integer.decode(value()).intValue(); } catch(NumberFormatException exc) { return 0; } } /** * The upper bound for the value. * @return the maximum allowed value for this argument. */ public int max() { return max; } /** * The lower bound for the value. * @return the minimum allowed value for this argument. */ public int min() { return min; } } class StringArgumentImpl extends ConnectorImpl.ArgumentImpl implements Connector.StringArgument { StringArgumentImpl(String name, String label, String description, String value, boolean mustSpecify) { super(name, label, description, value, mustSpecify); } /** * Performs basic sanity check of argument. * @return <code>true</code> always */ public boolean isValid(String value) { return true; } } class SelectedArgumentImpl extends ConnectorImpl.ArgumentImpl implements Connector.SelectedArgument { private final List choices; SelectedArgumentImpl(String name, String label, String description, String value, boolean mustSpecify, List choices) { super(name, label, description, value, mustSpecify); this.choices = Collections.unmodifiableList( new ArrayList(choices)); } /** * Return the possible values for the argument * @return {@link List} of {@link String} */ public List choices() { return choices; } /** * Performs basic sanity check of argument. * @return <code>true</code> if value is one of {@link #choices()}. */ public boolean isValid(String value) { return choices.contains(value); } } }