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package java.lang;
The Compiler class is provided to support Java-to-native-code compilers and related services. By design, the Compiler class does nothing; it serves as a placeholder for a JIT compiler implementation. When the Java Virtual Machine first starts, it determines if the system property java.compiler exists. (System properties are accessible through System.getProperty(String) and System.getProperty(String, String). If so, it is assumed to be the name of a library (with a platform-dependent exact location and type); System.loadLibrary is called to load that library. If this loading succeeds, the function named java_lang_Compiler_start() in that library is called.
If no compiler is available, these methods do nothing.
Author: Frank Yellin Since: JDK1.0
/**
* 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.
Params: - clazz –
A class
Throws: - NullPointerException – If
clazz is null
Returns: true if the compilation succeeded; false if the compilation failed or no compiler is available
/**
* 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.
Params: - string –
The name of the classes to compile
Throws: - NullPointerException – If
string is null
Returns: true if the compilation succeeded; false if the compilation failed or no compiler is available
/**
* 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.
Params: - any –
An argument
Throws: - NullPointerException – If
any is null
Returns: A compiler-specific value, or null if no compiler is available
/**
* 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.
/**
* Cause the Compiler to resume operation.
*/
public static native void enable();
Cause the Compiler to cease operation.
/**
* Cause the Compiler to cease operation.
*/
public static native void disable();
}