| /* |
| * Copyright (c) 1995, 2008, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 java.lang; |
| |
| /** |
| * The {@code Compiler} class is provided to support Java-to-native-code |
| * compilers and related services. By design, the {@code Compiler} 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} exists. (System properties are accessible |
| * through {@link System#getProperty(String)} and {@link |
| * System#getProperty(String, String)}. If so, it is assumed to be the name of |
| * a library (with a platform-dependent exact location and type); {@link |
| * System#loadLibrary} is called to load that library. If this loading |
| * succeeds, the function named {@code java_lang_Compiler_start()} in that |
| * library is called. |
| * |
| * <p> If no compiler is available, these methods do nothing. |
| * |
| * @author Frank Yellin |
| * @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<Void>() { |
| public Void 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} if the compilation succeeded; {@code false} if the |
| * compilation failed or no compiler is available |
| * |
| * @throws NullPointerException |
| * If {@code clazz} is {@code null} |
| */ |
| 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} if the compilation succeeded; {@code false} if the |
| * compilation failed or no compiler is available |
| * |
| * @throws NullPointerException |
| * If {@code string} is {@code null} |
| */ |
| 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} if no compiler is |
| * available |
| * |
| * @throws NullPointerException |
| * If {@code any} is {@code null} |
| */ |
| 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(); |
| } |