Quelle Main.java
Sprache: JAVA
/*
* Copyright ( C ) 2018 The Android Open Source Project
*
* Licensed under the Apache License , Version 2 . 0 ( the " License " ) ;
* you may not use this file except in compliance with the License .
* You may obtain a copy of the License at
*
* http : //www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing , software
* distributed under the License is distributed on an " AS IS " BASIS ,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND , either express or implied .
* See the License for the specific language governing permissions and
* limitations under the License .
*/
import annotations.ConstantMethodHandle;
import annotations.ConstantMethodType;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodType;
import java.lang.invoke.WrongMethodTypeException;
import java.io.StreamTokenizer;
import java.io.StringReader;
import java.util.Stack;
class Main {
/**
* Number of iterations run to attempt to trigger JIT compilation . These tests run on ART and
* the RI so they iterate rather than using the ART only native method ensureJitCompiled ( ) .
*/
private static final int ITERATIONS_FOR_JIT = 30000 ;
/** A static field updated by method handle getters and setters. */
private static String name = "default" ;
private static void unreachable() {
throw new Error("Unreachable" );
}
private static void assertEquals(Object expected, Object actual) {
if (!expected.equals(actual)) {
throw new AssertionError("Assertion failure: " + expected + " != " + actual);
}
}
private static class LocalClass {
public LocalClass() {}
private int field;
}
private static class TestTokenizer extends StreamTokenizer {
public TestTokenizer(String message) {
super (new StringReader(message));
}
}
@ConstantMethodType(
returnType = String.class ,
parameterTypes = {int .class , Integer.class , System.class })
private static MethodType methodType0() {
unreachable();
return null ;
}
@ConstantMethodType(
returnType = void .class ,
parameterTypes = {LocalClass.class })
private static MethodType methodType1() {
unreachable();
return null ;
}
@ConstantMethodType(
returnType = void .class ,
parameterTypes = {MissingType.class })
private static MethodType missingType() {
unreachable();
return null ;
}
private static void repeatConstMethodType0(MethodType expected) {
System.out.print("repeatConstMethodType0(" );
System.out.print(expected);
System.out.println(")" );
for (int i = 0 ; i < ITERATIONS_FOR_JIT; ++i) {
MethodType actual = methodType0();
assertEquals(expected, actual);
}
}
private static void repeatConstMethodType1(MethodType expected) {
System.out.print("repeatConstMethodType1(" );
System.out.print(expected);
System.out.println(")" );
for (int i = 0 ; i < ITERATIONS_FOR_JIT; ++i) {
MethodType actual = methodType1();
assertEquals(expected, actual);
}
}
static void helloWorld(String who) {
System.out.print("Hello World! And Hello " );
System.out.println(who);
}
@ConstantMethodHandle(
kind = ConstantMethodHandle.INVOKE_STATIC,
owner = "Main" ,
fieldOrMethodName = "helloWorld" ,
descriptor = "(Ljava/lang/String;)V" )
private static MethodHandle printHelloHandle() {
unreachable();
return null ;
}
@ConstantMethodHandle(
kind = ConstantMethodHandle.STATIC_PUT,
owner = "Main" ,
fieldOrMethodName = "name" ,
descriptor = "Ljava/lang/String;" )
private static MethodHandle setNameHandle() {
unreachable();
return null ;
}
@ConstantMethodHandle(
kind = ConstantMethodHandle.STATIC_GET,
owner = "Main" ,
fieldOrMethodName = "name" ,
descriptor = "Ljava/lang/String;" )
private static MethodHandle getNameHandle() {
unreachable();
return null ;
}
@ConstantMethodHandle(
kind = ConstantMethodHandle.STATIC_GET,
owner = "java/lang/Math" ,
fieldOrMethodName = "E" ,
descriptor = "D" )
private static MethodHandle getMathE() {
unreachable();
return null ;
}
@ConstantMethodHandle(
kind = ConstantMethodHandle.STATIC_PUT,
owner = "java/lang/Math" ,
fieldOrMethodName = "E" ,
descriptor = "D" )
private static MethodHandle putMathE() {
unreachable();
return null ;
}
@ConstantMethodHandle(
kind = ConstantMethodHandle.INSTANCE_GET,
owner = "java/io/StreamTokenizer" ,
fieldOrMethodName = "sval" ,
descriptor = "Ljava/lang/String;" )
private static MethodHandle getSval() {
unreachable();
return null ;
}
// This constant-method-handle references a private instance field. If
// referenced in bytecode it raises IAE at load time.
@ConstantMethodHandle(
kind = ConstantMethodHandle.INSTANCE_PUT,
owner = "java/io/StreamTokenizer" ,
fieldOrMethodName = "peekc" ,
descriptor = "I" )
private static MethodHandle putPeekc() {
unreachable();
return null ;
}
@ConstantMethodHandle(
kind = ConstantMethodHandle.INVOKE_VIRTUAL,
owner = "java/util/Stack" ,
fieldOrMethodName = "pop" ,
descriptor = "()Ljava/lang/Object;" )
private static MethodHandle stackPop() {
unreachable();
return null ;
}
@ConstantMethodHandle(
kind = ConstantMethodHandle.INVOKE_VIRTUAL,
owner = "java/util/Stack" ,
fieldOrMethodName = "trimToSize" ,
descriptor = "()V" )
private static MethodHandle stackTrim() {
unreachable();
return null ;
}
@ConstantMethodHandle(
kind = ConstantMethodHandle.STATIC_GET,
owner = "PrivateMember" ,
fieldOrMethodName = "privateField" ,
descriptor = "I" )
private static MethodHandle getPrivateField() {
unreachable();
return null ;
}
private static void repeatConstMethodHandle() throws Throwable {
System.out.println("repeatConstMethodHandle()" );
String[] values = {"A" , "B" , "C" };
for (int i = 0 ; i < ITERATIONS_FOR_JIT; ++i) {
String value = values[i % values.length];
setNameHandle().invoke(value);
String actual = (String) getNameHandle().invokeExact();
assertEquals(value, actual);
assertEquals(value, name);
}
}
public static void main(String[] args) throws Throwable {
System.out.println(methodType0());
repeatConstMethodType0(
MethodType.methodType(String.class , int .class , Integer.class , System.class ));
repeatConstMethodType1(MethodType.methodType(void .class , LocalClass.class ));
printHelloHandle().invokeExact("Zog" );
printHelloHandle().invokeExact("Zorba" );
setNameHandle().invokeExact("HoverFly" );
System.out.print("name is " );
System.out.println(name);
System.out.println(getMathE().invoke());
repeatConstMethodHandle();
try {
putMathE().invokeExact(Math.PI);
unreachable();
} catch (IllegalAccessError expected) {
System.out.println("Attempting to set Math.E raised IAE" );
}
StreamTokenizer st = new StreamTokenizer(new StringReader("Quack Moo Woof" ));
while (st.nextToken() != StreamTokenizer.TT_EOF) {
System.out.println((String) getSval().invokeExact(st));
}
TestTokenizer tt = new TestTokenizer("Test message 123" );
tt.nextToken();
System.out.println((String) getSval().invoke(tt));
try {
System.out.println((String) getSval().invokeExact(tt));
} catch (WrongMethodTypeException wmte) {
System.out.println("Getting field in TestTokenizer raised WMTE (woohoo!)" );
}
Stack stack = new Stack();
stack.push(Integer.valueOf(3 ));
stack.push(Integer.valueOf(5 ));
stack.push(Integer.valueOf(7 ));
Object tos = stackPop().invokeExact(stack);
System.out.println("Stack: tos was " + tos);
System.out.println("Stack: capacity was " + stack.capacity());
stackTrim().invokeExact(stack);
System.out.println("Stack: capacity is " + stack.capacity());
// We used to not report in the compiler that loading a ConstMethodHandle/ConstMethodType
// can throw, which meant we were not catching the exception in the situation where we
// inline the loading.
try {
$inline$getPrivateField();
System.out.println("Expected IllegalAccessError" );
} catch (IllegalAccessError e) {
// expected
}
try {
$inline$missingType();
System.out.println("Expected NoClassDefFoundError" );
} catch (NoClassDefFoundError e) {
// expected
}
}
public static void $inline$getPrivateField() {
getPrivateField();
}
public static void $inline$missingType() {
missingType();
}
}
class PrivateMember {
private static int privateField;
}
class MissingType {
}
Messung V0.5 in Prozent C=80 H=95 G=87
¤ Dauer der Verarbeitung: 0.13 Sekunden
(vorverarbeitet am 2026-06-29)
¤
*© Formatika GbR, Deutschland
2026-07-09