Examples of org.springframework.asm.MethodVisitor

org.springframework.asm.MethodVisitor
A visitor to visit a Java method. The methods of this class must be called in the following order: ( visitParameter )* [ visitAnnotationDefault ] ( visitAnnotation | visitTypeAnnotation | visitAttribute )* [ visitCode ( visitFrame | visitXInsn | visitLabel | visitInsnAnnotation | visitTryCatchBlock | visitTryCatchBlockAnnotation | visitLocalVariable | visitLocalVariableAnnotation | 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, visitInsnAnnotation must be called after the annotated instruction, visitTryCatchBlock must be called before the labels passed as arguments have been visited, visitTryCatchBlockAnnotation must be called after the corresponding try catch block has been visited, and the visitLocalVariable, visitLocalVariableAnnotation and visitLineNumber methods must be called after the labels passed as arguments have been visited. @author Eric Bruneton

      for (FieldAdder fieldAdder: fieldAdders) {
        fieldAdder.generateField(cw,this);
      }
    }
    if (clinitAdders != null) {
      MethodVisitor mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "<clinit>", "()V", null, null);
      mv.visitCode();
      nextFreeVariableId = 0; // To 0 because there is no 'this' in a clinit
      for (ClinitAdder clinitAdder: clinitAdders) {
        clinitAdder.generateCode(mv, this);
      }
      mv.visitInsn(RETURN);
      mv.visitMaxs(0,0); // not supplied due to COMPUTE_MAXS
      mv.visitEnd();
    }
  }

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    String clazzName = "spel/Ex" + getNextSuffix();
    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS|ClassWriter.COMPUTE_FRAMES);
    cw.visit(V1_5, ACC_PUBLIC, clazzName, null, "org/springframework/expression/spel/CompiledExpression", null);


    // Create default constructor
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, "org/springframework/expression/spel/CompiledExpression",
        "<init>", "()V", false);
    mv.visitInsn(RETURN);
    mv.visitMaxs(1, 1);
    mv.visitEnd();


    // Create getValue() method
    mv = cw.visitMethod(ACC_PUBLIC, "getValue",
        "(Ljava/lang/Object;Lorg/springframework/expression/EvaluationContext;)Ljava/lang/Object;", null,
        new String[ ]{"org/springframework/expression/EvaluationException"});
    mv.visitCode();


    CodeFlow cf = new CodeFlow(clazzName, cw);


    // Ask the expression AST to generate the body of the method
    try {
      expressionToCompile.generateCode(mv, cf);
    }
    catch (IllegalStateException ex) {
      if (logger.isDebugEnabled()) {
        logger.debug(expressionToCompile.getClass().getSimpleName() +
            ".generateCode opted out of compilation: " + ex.getMessage());
      }
      return null;
    }


    CodeFlow.insertBoxIfNecessary(mv, cf.lastDescriptor());
    if ("V".equals(cf.lastDescriptor())) {
      mv.visitInsn(ACONST_NULL);
    }
    mv.visitInsn(ARETURN);


    mv.visitMaxs(0, 0);  // not supplied due to COMPUTE_MAXS
    mv.visitEnd();
    cw.visitEnd();
    
    cf.finish();
    
    byte[] data = cw.toByteArray();

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    };
  }


  private MethodVisitor createMethodVisitor(final ProjectModelImpl model, final String className,
      final MemberHandle mh) {
    return new MethodVisitor() {


      public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
        model.addMemberAnnotation(convertAnnotationDescriptor(desc), mh);
        return createAnnotationVisitor(model, mh, desc);
      }

View Full Code Here

    fv.visitEnd();


    String voidNoArgMethodDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {});


    // field class loading
    MethodVisitor mv = cw.visitMethod(ACC_STATIC, CINIT, voidNoArgMethodDescriptor, null, null);
    mv.visitCode();
    mv.visitLdcInsn(Type.getType(clazz));
    mv.visitFieldInsn(PUTSTATIC, className, CLASS_FIELD_NAME, CLASS_DESCRIPTOR);
    mv.visitInsn(RETURN);
    mv.visitMaxs(1, 0);
    mv.visitEnd();


    String voidArgClassAndIntDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {
        Type.getType(Class.class), Type.INT_TYPE });


    // default constructor
    mv = cw.visitMethod(ACC_PUBLIC, INIT, voidNoArgMethodDescriptor, null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETSTATIC, className, CLASS_FIELD_NAME, CLASS_DESCRIPTOR);
    mv.visitFieldInsn(GETSTATIC, className, ID_FIELD_NAME, Type.INT_TYPE.getDescriptor());
    mv.visitMethodInsn(INVOKESPECIAL, className, INIT, voidArgClassAndIntDescriptor);
    mv.visitInsn(RETURN);
    mv.visitMaxs(3, 1);
    mv.visitEnd();


    // two-arg constructor
    mv = cw.visitMethod(ACC_PUBLIC, INIT, voidArgClassAndIntDescriptor, null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitVarInsn(ILOAD, 2);
    mv.visitMethodInsn(INVOKESPECIAL, INSTANTIATOR_NAME, INIT, voidArgClassAndIntDescriptor);
    mv.visitInsn(RETURN);
    mv.visitMaxs(3, 3);
    mv.visitEnd();


    Type customClassType = Type.getType(clazz);
    String customTypeNoArgDesc = Type.getMethodDescriptor(customClassType, new Type[] {});


    // newInstance overloaded method
    mv = cw.visitMethod(ACC_PUBLIC, NEW_INSTANCE, customTypeNoArgDesc, null, null);


    mv.visitCode();
    mv.visitTypeInsn(NEW, customClassType.getInternalName());
    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKESPECIAL, customClassType.getInternalName(), INIT, voidNoArgMethodDescriptor);
    mv.visitInsn(ARETURN);
    mv.visitMaxs(2, 1);
    mv.visitEnd();


    // plus original method signature
    mv = cw.visitMethod(ACC_PUBLIC + ACC_BRIDGE + ACC_SYNTHETIC, NEW_INSTANCE, NEW_INSTANCE_DESC, null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKEVIRTUAL, className, NEW_INSTANCE, customTypeNoArgDesc);
    mv.visitInsn(ARETURN);
    mv.visitMaxs(1, 1);
    mv.visitEnd();


    // end class generation
    cw.visitEnd();


    return cw.toByteArray();

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org.springframework.expression.spel.CodeFlow

org.springframework.expression.spel.standard.SpelCompiler

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