ASMSupport教程4.4 自增减操作(++,

import java.io.PrintStream;

public class CrementOperatorGenerateExample { public void demonstrate() { System.out.println("***demonstrate"); int a = 1; int b = 2; b++; int c = b; int d = a; a++; c++; System.out.println("a = " + a); System.out.println("b = " + b); System.out.println("c = " + c); System.out.println("d = " + d); }

public void incrementAndDecrement() { System.out.println("***incrementAndDecrement"); int count = 10; count++; count--; System.out.println("count = " + count); }

public static void main(String[] args) { CrementOperatorGenerateExample currentObj = new CrementOperatorGenerateExample(); currentObj.demonstrate(); currentObj.incrementAndDecrement(); } }</pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div>

import org.objectweb.asm.Opcodes;

import jw.asmsupport.block.method.common.CommonMethodBody; import jw.asmsupport.block.method.common.StaticMethodBody; import jw.asmsupport.clazz.AClass; import jw.asmsupport.clazz.AClassFactory; import jw.asmsupport.creator.ClassCreator; import jw.asmsupport.definition.value.Value; import jw.asmsupport.definition.variable.LocalVariable;

import example.AbstractExample;

public class CrementOperatorGenerate extends AbstractExample {

1/**
2 * @param args
3 */
4public static void main(String[] args) {
5
6	ClassCreator creator = new ClassCreator(Opcodes.V1_5, Opcodes.ACC_PUBLIC , "generated.operators.CrementOperatorGenerateExample", null, null);
7	
8	/*
9	 * 对应java代码
10     * public void demonstrate() {
11     *     System.out.println("******************************demonstrate***************************");
12     *     int a = 1;
13     *     int b = 2;
14     *     int c;
15     *     int d;
16     *     c = ++b;
17     *     d = a++;
18     *     c++;
19     *     System.out.println("a = " + a);
20     *     System.out.println("b = " + b);
21     *     System.out.println("c = " + c);
22     *     System.out.println("d = " + d);
23     * }
24	 */
25	creator.createMethod("demonstrate", null, null, null, null, Opcodes.ACC_PUBLIC, new CommonMethodBody() {
26		@Override
27		public void generateBody(LocalVariable... argus) {
28			invoke(systemOut, "println", Value.value("******************************demonstrate***************************"));
29			
30			//int a = 1;
31		    LocalVariable a = createVariable("a", AClass.INT_ACLASS, false, Value.value(1));
32		    //int b = 2;
33		    LocalVariable b = createVariable("b", AClass.INT_ACLASS, false, Value.value(2));
34		    //int c = ++b;
35		    LocalVariable c = createVariable("c", AClass.INT_ACLASS, false, beforeInc(b));
36		    //d = a++;
37		    LocalVariable d = createVariable("d", AClass.INT_ACLASS, false, afterInc(a));
38		    //c++;
39		    afterInc(c);
40		    
41		    //System.out.println("a = " + a);
42			invoke(systemOut, "println", append(Value.value("a = "), a)); 
43			invoke(systemOut, "println", append(Value.value("b = "), b)); 
44			invoke(systemOut, "println", append(Value.value("c = "), c)); 
45			invoke(systemOut, "println", append(Value.value("d = "), d)); 
46			runReturn();
47		}
48	});
49	
50	/*
51	 * java code:
52	 * public void incrementAndDecrement(String[] argv) {
53	 *    System.out.println("******************************incrementAndDecrement***************************");
54     *    int count = 10;
55     *    ++count;
56     *    --count;
57     *    System.out.println(count);
58     * }
59	 */
60	creator.createMethod("incrementAndDecrement", null, null, null, null, Opcodes.ACC_PUBLIC, new CommonMethodBody() {
61	    @Override
62	    public void generateBody(LocalVariable... argus) {
63			invoke(systemOut, "println", Value.value("******************************incrementAndDecrement***************************"));
64			//int count = 10;
65			LocalVariable count = createVariable("count", AClass.INT_ACLASS, false, Value.value(10));
66			// ++count
67			beforeInc(count); 
68			// --count;
69			beforeDec(count); 
70			// System.out.println("count = " +  count);
71			invoke(systemOut, "println", append(Value.value("count = "), count));
72			runReturn();
73		}
74	});
75	
76	creator.createStaticMethod("main", new AClass[]{AClassFactory.getProductClass(String[].class)}, new String[]{"args"}, null, null,
77			Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC, new StaticMethodBody(){
78
79		@Override
80		public void generateBody(LocalVariable... argus) {
81			LocalVariable currentObj = createVariable("currentObj", getMethodOwner(), false, invokeConstructor(getMethodOwner()));
82			invoke(currentObj, "demonstrate");
83			invoke(currentObj, "incrementAndDecrement");
84			runReturn();
85		}
86    });
87	generate(creator);
88}

} </pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div>