Examples of jdk.internal.org.objectweb.asm.commons.GeneratorAdapter

Package jdk.internal.org.objectweb.asm.commons

Examples of jdk.internal.org.objectweb.asm.commons.GeneratorAdapter

jdk.internal.org.objectweb.asm.commons.GeneratorAdapter

A {@link jdk.internal.org.objectweb.asm.MethodVisitor} with convenient methods to generatecode. For example, using this adapter, the class below

 public class Example { public static void main(String[] args) { System.out.println("Hello world!"); } }

can be generated as follows:

 ClassWriter cw = new ClassWriter(true); cw.visit(V1_1, ACC_PUBLIC, "Example", null, "java/lang/Object", null); Method m = Method.getMethod("void <init> ()"); GeneratorAdapter mg = new GeneratorAdapter(ACC_PUBLIC, m, null, null, cw); mg.loadThis(); mg.invokeConstructor(Type.getType(Object.class), m); mg.returnValue(); mg.endMethod(); m = Method.getMethod("void main (String[])"); mg = new GeneratorAdapter(ACC_PUBLIC + ACC_STATIC, m, null, null, cw); mg.getStatic(Type.getType(System.class), "out", Type.getType(PrintStream.class)); mg.push("Hello world!"); mg.invokeVirtual(Type.getType(PrintStream.class), Method.getMethod("void println (String)")); mg.returnValue(); mg.endMethod(); cw.visitEnd();

@author Juozas Baliuka @author Chris Nokleberg @author Eric Bruneton @author Prashant Deva

            binaryOp(cw, op, long.class, realOp, integerOp);
        }


        static void binaryOp(ClassWriter cw, String op, Class<?> returnType, Consumer<GeneratorAdapter> realOp,
                             Consumer<GeneratorAdapter> integerOp) {
            GeneratorAdapter mv = new GeneratorAdapter(ACC_PUBLIC + ACC_STATIC,
                    method(toBytecodeName(op), desc(returnType, long.class, long.class)), null, null, cw);


            isInteger(mv, 0);
            Label argOneIsLong = new Label();
            mv.ifZCmp(IFNE, argOneIsLong);
            asDouble(mv, 0);
            isInteger(mv, 1);
            Label argTwoIsLong = new Label();
            mv.ifZCmp(IFNE, argTwoIsLong);
            asDouble(mv, 1);
            Label doubleOperation = new Label();
            mv.goTo(doubleOperation);
            mv.visitLabel(argTwoIsLong);
            asLong(mv, 1);
            mv.visitInsn(L2D);
            mv.goTo(doubleOperation);
            mv.visitLabel(argOneIsLong);
            isInteger(mv, 1);
            Label longOperation = new Label();
            mv.ifZCmp(IFNE, longOperation);
            asLong(mv, 0);
            mv.visitInsn(L2D);
            asDouble(mv, 1);
            mv.visitLabel(doubleOperation);
            realOp.accept(mv);
            mv.returnValue();
            mv.visitLabel(longOperation);
            asLong(mv, 0);
            asLong(mv, 1);
            integerOp.accept(mv);
            mv.returnValue();
            mv.endMethod();
        }

View Full Code Here

            binaryOp(cw, op, long.class, realOp, integerOp);
        }


        static void binaryOp(ClassWriter cw, String op, Class<?> returnType, Consumer<GeneratorAdapter> realOp,
                             Consumer<GeneratorAdapter> integerOp) {
            GeneratorAdapter mv = new GeneratorAdapter(ACC_PUBLIC + ACC_STATIC,
                    method(toBytecodeName(op), desc(returnType, long.class, long.class)), null, null, cw);


            isInteger(mv, 0);
            Label argOneIsLong = new Label();
            mv.ifZCmp(IFNE, argOneIsLong);
            asDouble(mv, 0);
            isInteger(mv, 1);
            Label argTwoIsLong = new Label();
            mv.ifZCmp(IFNE, argTwoIsLong);
            asDouble(mv, 1);
            Label doubleOperation = new Label();
            mv.goTo(doubleOperation);
            mv.visitLabel(argTwoIsLong);
            asLong(mv, 1);
            mv.visitInsn(L2D);
            mv.goTo(doubleOperation);
            mv.visitLabel(argOneIsLong);
            isInteger(mv, 1);
            Label longOperation = new Label();
            mv.ifZCmp(IFNE, longOperation);
            asLong(mv, 0);
            mv.visitInsn(L2D);
            asDouble(mv, 1);
            mv.visitLabel(doubleOperation);
            realOp.accept(mv);
            mv.returnValue();
            mv.visitLabel(longOperation);
            asLong(mv, 0);
            asLong(mv, 1);
            integerOp.accept(mv);
            mv.returnValue();
            mv.endMethod();
        }

View Full Code Here

                throw uncheck(e);
            }
        }


        GeneratorAdapter generator(int access, jdk.internal.org.objectweb.asm.commons.Method method) {
            return new GeneratorAdapter(access, method, cw.visitMethod(access, method.getName(), method.getDescriptor(), null, null));
        }

View Full Code Here

            mv.returnValue();
            mv.endMethod();
        }


        void constructor() {
            GeneratorAdapter ctor = generator(ACC_PUBLIC, method("<init>", desc(void.class)));
            ctor.loadThis();
            ctor.invokeConstructor(getType(Object.class), method("<init>", desc(void.class)));
            ctor.returnValue();
            ctor.endMethod();
        }

View Full Code Here

                throw uncheck(e);
            }
        }


        GeneratorAdapter generator(int access, jdk.internal.org.objectweb.asm.commons.Method method) {
            return new GeneratorAdapter(access, method, cw.visitMethod(access, method.getName(), method.getDescriptor(), null, null));
        }

View Full Code Here

            mv.returnValue();
            mv.endMethod();
        }


        void constructor() {
            GeneratorAdapter ctor = generator(ACC_PUBLIC, method("<init>", desc(void.class)));
            ctor.loadThis();
            ctor.invokeConstructor(getType(Object.class), method("<init>", desc(void.class)));
            ctor.returnValue();
            ctor.endMethod();
        }

View Full Code Here

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