/*
* Copyright (C) 2012 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.
*/
package com.google.dexmaker.examples;
import com.google.dexmaker.BinaryOp;
import com.google.dexmaker.Code;
import com.google.dexmaker.Comparison;
import com.google.dexmaker.DexMaker;
import com.google.dexmaker.Label;
import com.google.dexmaker.Local;
import com.google.dexmaker.MethodId;
import com.google.dexmaker.TypeId;
import java.io.File;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public final class FibonacciMaker {
public static void main(String[] args) throws Exception {
TypeId<?> fibonacci = TypeId.get("Lcom/google/dexmaker/examples/Fibonacci;");
String fileName = "Fibonacci.generated";
DexMaker dexMaker = new DexMaker();
dexMaker.declare(fibonacci, fileName, Modifier.PUBLIC, TypeId.OBJECT);
MethodId<?, Integer> fib = fibonacci.getMethod(TypeId.INT, "fib", TypeId.INT);
Code code = dexMaker.declare(fib, Modifier.PUBLIC | Modifier.STATIC);
Local<Integer> i = code.getParameter(0, TypeId.INT);
Local<Integer> constant1 = code.newLocal(TypeId.INT);
Local<Integer> constant2 = code.newLocal(TypeId.INT);
Local<Integer> a = code.newLocal(TypeId.INT);
Local<Integer> b = code.newLocal(TypeId.INT);
Local<Integer> c = code.newLocal(TypeId.INT);
Local<Integer> d = code.newLocal(TypeId.INT);
Local<Integer> result = code.newLocal(TypeId.INT);
code.loadConstant(constant1, 1);
code.loadConstant(constant2, 2);
Label baseCase = new Label();
code.compare(Comparison.LT, baseCase, i, constant2);
code.op(BinaryOp.SUBTRACT, a, i, constant1);
code.op(BinaryOp.SUBTRACT, b, i, constant2);
code.invokeStatic(fib, c, a);
code.invokeStatic(fib, d, b);
code.op(BinaryOp.ADD, result, c, d);
code.returnValue(result);
code.mark(baseCase);
code.returnValue(i);
ClassLoader loader = dexMaker.generateAndLoad(
FibonacciMaker.class.getClassLoader(), getDataDirectory());
Class<?> fibonacciClass = loader.loadClass("com.google.dexmaker.examples.Fibonacci");
Method fibMethod = fibonacciClass.getMethod("fib", int.class);
System.out.println(fibMethod.invoke(null, 8));
}
public static File getDataDirectory() throws Exception {
Class<?> environmentClass = Class.forName("android.os.Environment");
Method method = environmentClass.getMethod("getDataDirectory");
Object dataDirectory = method.invoke(null);
return (File) dataDirectory;
}
}