/*
* 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();
}