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Compiler.java
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136 lines (126 loc) · 4.01 KB
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/*
* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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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();
}