ASMSupport教程4.9 生成三元运算符

1i = -10;
2k = i < 0 ? -i : i; // get absolute value of i
3System.out.print("Absolute value of ");
4System.out.println(i + " is " + k);

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import org.objectweb.asm.Opcodes;

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 TernaryOperatorGenerate 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.TernaryOperatorGenerateExample", null, null);
7	
8	creator.createStaticMethod("main", new AClass[]{AClassFactory.getProductClass(String[].class)}, new String[]{"args"}, null, null,
9			Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC, new StaticMethodBody(){
10
11		@Override
12		public void generateBody(LocalVariable... argus) {
13			//int i = 10;
14			LocalVariable i = createVariable("i", AClass.INT_ACLASS, false, Value.value(10));
15			
16			//ternary方法将生成三元操作
17			//int k = i < 0 ? -i : i;
18			LocalVariable k = createVariable("k", AClass.INT_ACLASS, false, ternary(lessThan(i, Value.value(0)), neg(i), i));
19			
20			//System.out.print("Absolute value of ");
21			invoke(systemOut, "print", Value.value("Absolute value of "));
22			
23			//System.out.println(i + " is " + k);
24			invoke(systemOut, "println", append(i, Value.value(" is "), k));
25			
26			//i = -10;
27			assign(i, Value.value(-10));
28			
29			//k = i < 0 ? -i : i;
30			assign(k, ternary(lessThan(i, Value.value(0)), neg(i), i));
31
32			//System.out.print("Absolute value of ");
33			invoke(systemOut, "print", Value.value("Absolute value of "));
34			
35			//System.out.println(i + " is " + k);
36			invoke(systemOut, "println", append(i, Value.value(" is "), k));
37			
38			runReturn();
39		}
40    });
41	generate(creator);
42}

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