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/* * @(#)Compiler.java 1.22 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.lang; /** * The <code>Compiler</code> class is provided to support * Java-to-native-code compilers and related services. By design, the * <code>Compiler</code> class does nothing; it serves as a * placeholder for a JIT compiler implementation. * <p> * When the Java Virtual Machine first starts, it determines if the * system property <code>java.compiler</code> exists. (System * properties are accessible through <code>getProperty</code>, * a method defined by the <code>System</code> class.) If so, it is * assumed to be the name of a library (with a platform-dependent * exact location and type); the <code>loadLibrary</code> method in * class <code>System</code> is called to load that library. If this * loading succeeds, the function named * <code>java_lang_Compiler_start()</code> in that library is called. * <p> * If no compiler is available, these methods do nothing. * * @author Frank Yellin * @version 1.22, 11/17/05 * @see java.lang.System#getProperty(java.lang.String) * @see java.lang.System#getProperty(java.lang.String, java.lang.String) * @see java.lang.System#loadLibrary(java.lang.String) * @since JDK1.0 */ public final class Compiler { private Compiler() {} // don't make instances private static native void initialize(); private static native void registerNatives(); static { registerNatives(); java.security.AccessController.doPrivileged (new java.security.PrivilegedAction() { public Object run() { boolean loaded = false; String jit = System.getProperty("java.compiler"); if ((jit != null) && (!jit.equals("NONE")) && (!jit.equals(""))) { try { System.loadLibrary(jit); initialize(); loaded = true; } catch (UnsatisfiedLinkError e) { System.err.println("Warning: JIT compiler \"" + jit + "\" not found. Will use interpreter."); } } String info = System.getProperty("java.vm.info"); if (loaded) { System.setProperty("java.vm.info", info + ", " + jit); } else { System.setProperty("java.vm.info", info + ", nojit"); } return null; } }); } /** * Compiles the specified class. * * @param clazz a class. * @return <code>true</code> if the compilation succeeded; * <code>false</code> if the compilation failed or no compiler * is available. * @exception NullPointerException if <code>clazz</code> is * <code>null</code>. */ public static native boolean compileClass(Class<?> clazz); /** * Compiles all classes whose name matches the specified string. * * @param string the name of the classes to compile. * @return <code>true</code> if the compilation succeeded; * <code>false</code> if the compilation failed or no compiler * is available. * @exception NullPointerException if <code>string</code> is * <code>null</code>. */ public static native boolean compileClasses(String string); /** * Examines the argument type and its fields and perform some documented * operation. No specific operations are required. * * @param any an argument. * @return a compiler-specific value, or <code>null</code> if no compiler * is available. * @exception NullPointerException if <code>any</code> is * <code>null</code>. */ public static native Object command(Object any); /** * Cause the Compiler to resume operation. */ public static native void enable(); /** * Cause the Compiler to cease operation. */ public static native void disable(); }