Examples of org.objectweb.asm.MethodVisitor

org.objectweb.asm.MethodVisitor
A visitor to visit a Java method. The methods of this interface must be called in the following order: [ visitAnnotationDefault ] ( visitAnnotation | visitParameterAnnotation | visitAttribute )* [ visitCode ( visitXInsn | visitLabel | visitTryCatchBlock | visitLocalVariable | visitLineNumber)* visitMaxs ] visitEnd. In addition, the visitXInsn and visitLabel methods must be called in the sequential order of the bytecode instructions of the visited code, and the visitLocalVariable and visitLineNumber methods must be called after the labels passed as arguments have been visited. @author Eric Bruneton


        make_invoke_method(cw, self_type, arity);


        CompilerVisitor.make_invoketail_method(cw, self_type, arity, 0);


        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "arity", "()I", null, null);
        mv.visitCode();
        mv.visitLdcInsn(new Integer(arity));
        mv.visitInsn(Opcodes.IRETURN);
        mv.visitMaxs(2, 2);
        mv.visitEnd();


        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "invoke", "("
                + EPROC_TYPE.getDescriptor() + EOBJECT_ARR_TYPE.getDescriptor()
                + ")" + EOBJECT_TYPE.getDescriptor(), null, PAUSABLE_EX);
        mv.visitCode();
        mv.visitVarInsn(Opcodes.ALOAD, 0); // load this
        mv.visitVarInsn(Opcodes.ALOAD, 1); // load proc
        for (int i = 0; i < arity; i++) {
            mv.visitVarInsn(Opcodes.ALOAD, 2);
            push_int(mv, i);
            mv.visitInsn(Opcodes.AALOAD);
        }


        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, self_type, "invoke", EUtil
                .getSignature(arity, true));


        mv.visitInsn(Opcodes.ARETURN);
        mv.visitMaxs(arity + 2, arity + 2);
        mv.visitEnd();


        mv = cw.visitMethod(Opcodes.ACC_PROTECTED, "<init>", "()V", null, null);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, EFUN_TYPE.getInternalName(),
                "<init>", "()V");
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();


        make_cast_method(cw, arity);


        cw.visitEnd();

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            cw.visitField(ACC_PRIVATE | ACC_FINAL, "function_name", EATOM_DESC, null, null)
                    .visitEnd();




            // make constructor
            MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "("
                    + EFUNHANDLER_TYPE.getDescriptor()
                    + EATOM_DESC
                    + EATOM_DESC
                    + ")V", null, null);
            mv.visitCode();


            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKESPECIAL, super_class_name, "<init>",
                    "()V");


            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitFieldInsn(PUTFIELD, self_type, "handler", EFUNHANDLER_TYPE
                    .getDescriptor());
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 2);
            mv.visitFieldInsn(PUTFIELD, self_type, "module_name", EATOM_DESC);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 3);
            mv.visitFieldInsn(PUTFIELD, self_type, "function_name", EATOM_DESC);


            mv.visitInsn(RETURN);
            mv.visitMaxs(4, 4);
            mv.visitEnd();


            /** forward toString to handler */
            mv = cw.visitMethod(ACC_PUBLIC, "toString", "()Ljava/lang/String;", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0); // load self
            mv.visitFieldInsn(GETFIELD, self_type, "handler", EFUNHANDLER_TYPE.getDescriptor());
            mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "toString", "()Ljava/lang/String;");
            mv.visitInsn(ARETURN);
            mv.visitMaxs(3, 3);
            mv.visitEnd();


            // make invoke_tail method
            //CompilerVisitor.make_invoketail_method(cw, self_type, arity, 0);
            make_invoke_method(cw, self_type, arity);
            make_go_method(cw, self_type, arity);

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            throw new Error(e);
        }
    }


    private static void make_cast_method(ClassWriter cw, int n) {
        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC|Opcodes.ACC_STATIC, "cast",
                "(" + EOBJECT_DESC + ")L" + EFUN_NAME + n + ";",
                null, null);
        mv.visitCode();


        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitTypeInsn(INSTANCEOF, EFUN_NAME+n);


        Label fail = new Label();


        mv.visitJumpInsn(Opcodes.IFEQ, fail);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitTypeInsn(Opcodes.CHECKCAST, EFUN_NAME+n);
        mv.visitInsn(Opcodes.ARETURN);


        mv.visitLabel(fail);
        mv.visitInsn(Opcodes.ACONST_NULL);
        mv.visitInsn(Opcodes.ARETURN);


        mv.visitMaxs(2, 2);
        mv.visitEnd();
    }

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    }




    private static void make_go_method(ClassWriter cw, String self_type,
                                       int arity) {
        MethodVisitor mv;
        mv = cw.visitMethod(ACC_PUBLIC, "go", GO_DESC, null, PAUSABLE_EX);
        mv.visitCode();


        for (int i = 0; i < arity; i++) {
            mv.visitVarInsn(ALOAD, 1);
            mv.visitFieldInsn(GETFIELD, EPROC_NAME, "arg" + i, EOBJECT_DESC);
            mv.visitVarInsn(ASTORE, i + 2);
        }
        for (int i = 0; i < arity; i++) {
            mv.visitVarInsn(ALOAD, 1);
            mv.visitInsn(ACONST_NULL);
            mv.visitFieldInsn(PUTFIELD, EPROC_NAME, "arg" + i, EOBJECT_DESC);
        }


        // load handler
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, self_type, "handler", EFUNHANDLER_TYPE
                .getDescriptor());


        // load proc
        mv.visitVarInsn(ALOAD, 1);


        // create array
        mv.visitLdcInsn(new Integer(arity));
        mv.visitTypeInsn(ANEWARRAY, EOBJECT_TYPE.getInternalName());


        for (int i = 0; i < arity; i++) {
            mv.visitInsn(DUP);
            mv.visitLdcInsn(new Integer(i));
            mv.visitVarInsn(ALOAD, i + 2);
            mv.visitInsn(AASTORE);
        }


        mv.visitMethodInsn(INVOKEINTERFACE, EFUNHANDLER_TYPE.getInternalName(), "invoke",
                "(" + EPROC_TYPE.getDescriptor() + "[" + EOBJECT_DESC + ")" + EOBJECT_DESC);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(arity + 2, arity + 2);
        mv.visitEnd();


        cw.visitEnd();
    }

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  }


  @Override
  public MethodVisitor visitMethod(int access, String name, String desc,
                                   String signature, String[] exceptions) {
    MethodVisitor mv =
        cv.visitMethod(access, name, desc, signature, exceptions);
    return new HelperMethodAdapter(mv, access, name, desc);
  }

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   * Visits the specified method, adding line numbering.
   */
  @Override
  public MethodVisitor visitMethod(int access, final String name, String desc,
                                   String signature, String[] exceptions) {
    MethodVisitor mv = cv.visitMethod(access | Opcodes.ACC_SYNTHETIC,
                                      name, desc, signature, exceptions);
    return new LineNumberingMethodAdapter(mv, access | Opcodes.ACC_SYNTHETIC,
                                          name, desc) {
      @Override
      protected void onMethodEnter() {

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  }


  @Override
  public MethodVisitor visitMethod(int access, String name, String desc,
                                   String signature, String[] exceptions) {
    MethodVisitor mv =
        cv.visitMethod(access, name, desc, signature, exceptions);
    if ((access & (Opcodes.ACC_ABSTRACT | Opcodes.ACC_NATIVE)) != 0) {
      return mv;
    }

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          "Duplicate method after name translation in class "
              + className + ": " + name + ' ' + newDesc);
    }
    visitedMethods.add(fullDesc);


    MethodVisitor mv = super.visitMethod(access, name, newDesc,
        translator.getClassMirrorTranslation(signature), exceptions);
    return (mv == null)?null:new MethodTranslator(mv);
  }

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            */
            newAccess = access & ~ACC_SYNTHETIC & ~ACC_BRIDGE;
        } else
            newAccess = access;


        MethodVisitor mv = new MethodWeaver(super.visitMethod(newAccess,
                    name,
                    desc,
                    signature,
                    exceptions));

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        }


        if (!isInterface) {
          // "class$" method
          String exceptionTable[] = { JAVA_LANG_NOCLASSDEFFOUNDERROR };
          MethodVisitor mv = cv.visitMethod(ACC_STATIC+ACC_SYNTHETIC,
                            CLASS_METHOD,
                            CLASS_SIGNATURE,
                            null, exceptionTable);
  
          mv.visitCode();


              mv.visitVarInsn(ALOAD, 0);
              generateClassCall(mv);
              mv.visitInsn(ARETURN);
      
              mv.visitMaxs(0, 0);
              mv.visitEnd();
        }
      }
        cv.visitEnd();
    }

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