Examples of org.objectweb.asm.commons.GeneratorAdapter

org.objectweb.asm.commons.GeneratorAdapter

A {@link 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

        method().invokeVirtual(Type.getType(Object.class), Method.getMethod("Object " + call.getMethodAddr() + " ()"));
    }


    public void emitDEF_INST_METH(DefineInstanceMethodInstr instr) {
        IRMethod irMethod = instr.method;
        GeneratorAdapter adapter = new GeneratorAdapter(ACC_PUBLIC, Method.getMethod("void " + irMethod.getName() + " ()"), null, null, cls());
        adapter.loadThis();
        adapter.loadArgs();
        adapter.invokeStatic(Type.getType(Object.class), Method.getMethod("Object __ruby__" + irMethod.getName() + " (Object)"));
        adapter.returnValue();
        adapter.endMethod();
    }

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        adapter.endMethod();
    }


    public void emitDEF_CLS_METH(DefineClassMethodInstr instr) {
        IRMethod irMethod = instr.method;
        GeneratorAdapter adapter = new GeneratorAdapter(ACC_PUBLIC | ACC_STATIC, Method.getMethod("void " + irMethod.getName() + " ()"), null, null, cls());
        adapter.returnValue();
        adapter.endMethod();
    }

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        public MethodData methodData() {
            return methodStack.peek();
        }


        public void pushmethod(String name) {
            methodStack.push(new MethodData(new GeneratorAdapter(
                    ACC_PUBLIC | ACC_STATIC,
                    Method.getMethod("org.jruby.runtime.builtin.IRubyObject " + name + " (org.jruby.runtime.ThreadContext, org.jruby.runtime.builtin.IRubyObject)"),
                    null,
                    null,
                    cls)));

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        public MethodData methodData() {
            return methodStack.peek();
        }


        public void pushmethod(String name) {
            methodStack.push(new MethodData(new GeneratorAdapter(
                    ACC_PUBLIC | ACC_STATIC,
                    Method.getMethod("org.jruby.runtime.builtin.IRubyObject " + name + " (org.jruby.runtime.ThreadContext, org.jruby.runtime.builtin.IRubyObject)"),
                    null,
                    null,
                    cls)));

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            final String targetClassName, final Class superClass,
            final Class[] interfaces, final Map methods, final Type selfType) {
        ClassWriter cw = beginProxyClass(targetClassName, superClass,
                interfaces);


        GeneratorAdapter clazzInit = createClassInitializer(selfType, cw);


        generateConstructors(superClass, selfType, cw);


        generateGetProxyClass(selfType, cw);


        generateGetInvocationHandler(selfType, cw);


        generateProxyMethods(superClass, methods, selfType, cw, clazzInit);


        // finish class initializer
        clazzInit.returnValue();
        clazzInit.endMethod();


        // end class
        cw.visitEnd();


        byte[] data = cw.toByteArray();

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    }


    private static void generateGetInvocationHandler(Type selfType,
            ClassVisitor cw) {
        // make getter for handler
        GeneratorAdapter gh = new GeneratorAdapter(Opcodes.ACC_PUBLIC,
                new org.objectweb.asm.commons.Method("___getInvocationHandler",
                        INVOCATION_HANDLER_TYPE, EMPTY_TYPE_ARR), null,
                EMPTY_TYPE_ARR, cw);


        gh.loadThis();
        gh.getField(selfType, INVOCATION_HANDLER_FIELD_NAME,
                INVOCATION_HANDLER_TYPE);
        gh.returnValue();
        gh.endMethod();
    }

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        gh.endMethod();
    }


    private static void generateGetProxyClass(Type selfType, ClassVisitor cw) {
        // make getter for proxy class
        GeneratorAdapter gpc = new GeneratorAdapter(Opcodes.ACC_PUBLIC,
                new org.objectweb.asm.commons.Method("___getProxyClass",
                        PROXY_CLASS_TYPE, EMPTY_TYPE_ARR), null,
                EMPTY_TYPE_ARR, cw);
        gpc.getStatic(selfType, PROXY_CLASS_FIELD_NAME, PROXY_CLASS_TYPE);
        gpc.returnValue();
        gpc.endMethod();
    }

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        }
    }


    private static GeneratorAdapter createClassInitializer(Type selfType,
            ClassVisitor cw) {
        GeneratorAdapter clazzInit;
        clazzInit = new GeneratorAdapter(Opcodes.ACC_PRIVATE
                | Opcodes.ACC_STATIC, new org.objectweb.asm.commons.Method(
                "<clinit>", Type.VOID_TYPE, EMPTY_TYPE_ARR), null,
                EMPTY_TYPE_ARR, cw);


        clazzInit.visitLdcInsn(selfType.getClassName());
        clazzInit.invokeStatic(JAVA_LANG_CLASS_TYPE, CLASS_FORNAME_METHOD);
        clazzInit
                .invokeStatic(PROXY_HELPER_TYPE, HELPER_GET_PROXY_CLASS_METHOD);
        clazzInit.dup();
        clazzInit.putStatic(selfType, PROXY_CLASS_FIELD_NAME, PROXY_CLASS_TYPE);
        return clazzInit;
    }

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                        .getArgumentTypes());


        //
        // construct the proxy method
        //
        GeneratorAdapter ga = new GeneratorAdapter(Opcodes.ACC_PUBLIC, m, null,
                ex, cw);


        ga.loadThis();
        ga.getField(selfType, INVOCATION_HANDLER_FIELD_NAME,
                INVOCATION_HANDLER_TYPE);


        // if the method is extending something, then we have
        // to test if the handler is initialized...


        if (md.isImplemented()) {
            ga.dup();
            Label ok = ga.newLabel();
            ga.ifNonNull(ok);


            ga.loadThis();
            ga.loadArgs();
            ga.invokeConstructor(superType, m);
            ga.returnValue();
            ga.mark(ok);
        }


        ga.loadThis();
        ga.getStatic(selfType, field_name, PROXY_METHOD_TYPE);


        if (m.getArgumentTypes().length == 0) {
            // load static empty array
            ga.getStatic(JAVA_PROXY_TYPE, "NO_ARGS", Type
                    .getType(Object[].class));
        } else {
            // box arguments
            ga.loadArgArray();
        }


        Label before = ga.mark();


        ga.invokeInterface(INVOCATION_HANDLER_TYPE,
                INVOCATION_HANDLER_INVOKE_METHOD);


        Label after = ga.mark();


        ga.unbox(m.getReturnType());
        ga.returnValue();


        // this is a simple rethrow handler
        Label rethrow = ga.mark();
        ga.visitInsn(Opcodes.ATHROW);


        for (int i = 0; i < ex.length; i++) {
            ga.visitTryCatchBlock(before, after, rethrow, ex[i]
                    .getInternalName());
        }


        ga.visitTryCatchBlock(before, after, rethrow, "java/lang/Error");
        ga.visitTryCatchBlock(before, after, rethrow,
                "java/lang/RuntimeException");


        Type thr = Type.getType(Throwable.class);
        Label handler = ga.mark();
        Type udt = Type.getType(UndeclaredThrowableException.class);
        int loc = ga.newLocal(thr);
        ga.storeLocal(loc, thr);
        ga.newInstance(udt);
        ga.dup();
        ga.loadLocal(loc, thr);
        ga.invokeConstructor(udt, org.objectweb.asm.commons.Method
                .getMethod("void <init>(java.lang.Throwable)"));
        ga.throwException();


        ga.visitTryCatchBlock(before, after, handler, "java/lang/Throwable");


        ga.endMethod();


        //
        // construct the super-proxy method
        //
        if (md.isImplemented()) {


            GeneratorAdapter ga2 = new GeneratorAdapter(Opcodes.ACC_PUBLIC, sm,
                    null, ex, cw);


            ga2.loadThis();
            ga2.loadArgs();
            ga2.invokeConstructor(superType, m);
            ga2.returnValue();
            ga2.endMethod();
        }
    }

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        org.objectweb.asm.commons.Method super_m = new org.objectweb.asm.commons.Method(
                name1, Type.VOID_TYPE, toType(superConstructorParameterTypes));
        org.objectweb.asm.commons.Method m = new org.objectweb.asm.commons.Method(
                name1, Type.VOID_TYPE, toType(newConstructorParameterTypes));


        GeneratorAdapter ga = new GeneratorAdapter(access, m, signature,
                toType(superConstructorExceptions), cw);


        ga.loadThis();
        ga.loadArgs(0, superConstructorParameterTypes.length);
        ga.invokeConstructor(Type.getType(constructor.getDeclaringClass()),
                super_m);


        ga.loadThis();
        ga.loadArg(superConstructorParameterTypes.length);
        ga.putField(selfType, INVOCATION_HANDLER_FIELD_NAME,
                INVOCATION_HANDLER_TYPE);


        // do a void return
        ga.returnValue();
        ga.endMethod();
        return newConstructorParameterTypes;
    }

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