Examples of org.apache.tapestry5.plastic.InstructionBuilder

org.apache.tapestry5.plastic.InstructionBuilder
Simplifies the generation of method instructions for a particular method (or constructor), allowing bytecode to be created with a friendlier API that focuses on Java type names (names as they would appear in Java source) rather than JVM descriptors or internal names. In some limited cases, types may be specified as Java Class instances as well. In addition, there is good support for primitive type boxing and unboxing.
Most methods return the same instance of InstructionBuilder, allowing for a "fluid" API.
More complex functionality, such as {@linkplain #startTryCatch(TryCatchCallback) try/catch blocks}, is more like a DSL (domain specific language), and is based on callbacks. This looks better in Groovy and will be more reasonable once JDK 1.8 closures are available; in the meantime, it means some deeply nested inner classes, but helps ensure that correct bytecode is generated and helps to limit the amount of bookkeeping is necessary on the part of code using InstructionBuilder.

    private void implementShimInvoke(ClassNode shimClassNode)
    {
        MethodNode mn = new MethodNode(ACC_PUBLIC, "invoke", OBJECT_INT_OBJECT_ARRAY_TO_METHOD_INVOCATION_RESULT, null,
                null);


        InstructionBuilder builder = newBuilder(mn);


        // Arg 0 is the target instance
        // Arg 1 is the index
        // Arg 2 is the object array of parameters


        builder.loadArgument(0).checkcast(className);


        builder.loadArgument(1);


        builder.startSwitch(0, nextMethodIndex - 1, new SwitchCallback()
        {
            public void doSwitch(SwitchBlock block)
            {
                for (PlasticMethodImpl m : shimMethods)
                {

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            // Kind of awkward that exceptions are specified as String[] when what we have handy is List<String>
            MethodNode mn = new MethodNode(ACC_SYNTHETIC | ACC_FINAL, name, node.desc, node.signature, null);
            // But it is safe enough for the two nodes to share
            mn.exceptions = node.exceptions;


            InstructionBuilder builder = newBuilder(mn);


            builder.loadThis();
            builder.loadArguments();
            builder.invokeSpecial(className, description);
            builder.returnResult();


            addMethod(mn);


            return name;
        }

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        {
            String setAccessName = makeUnique(methodNames, "set_" + node.name);


            setAccess = new MethodNode(ACC_SYNTHETIC | ACC_FINAL, setAccessName, "(" + node.desc + ")V", null, null);


            InstructionBuilder builder = newBuilder(setAccess);


            pushFieldConduitOntoStack(conduitFieldName, builder);


            builder.loadThis();


            pushInstanceContextFieldOntoStack(builder);


            // Take the value passed to this method and push it onto the stack.


            builder.loadArgument(0);
            builder.boxPrimitive(typeName);


            builder.invoke(FieldConduit.class, void.class, "set", Object.class, InstanceContext.class, Object.class);


            if (isWriteBehindEnabled())
            {
                builder.loadThis().loadArgument(0).putField(className, node.name, typeName);
            }


            builder.returnResult();


            addMethod(setAccess);


            fieldToWriteMethod.put(node.name, setAccess);
        }

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            String getAccessName = makeUnique(methodNames, "getfieldvalue_" + node.name);


            getAccess = new MethodNode(ACC_SYNTHETIC | ACC_FINAL, getAccessName, "()" + node.desc, null, null);


            InstructionBuilder builder = newBuilder(getAccess);


            // Get the correct FieldConduit object on the stack


            pushFieldConduitOntoStack(conduitFieldName, builder);


            builder.loadThis();


            // Now push the instance context on the stack


            pushInstanceContextFieldOntoStack(builder);


            builder.invoke(FieldConduit.class, Object.class, "get", Object.class, InstanceContext.class).castOrUnbox(
                    typeName);


            if (writeBehindEnabled)
            {
                // Dupe the value, then push this, then swap


                if (isWide())
                {
                    // Dupe this under the wide value, then pop the wide value


                    builder.dupeWide().loadThis().dupe(2).pop();
                }
                else
                {
                    builder.dupe().loadThis().swap();
                }


                // At which point the stack is the result value, this, the result value


                builder.putField(className, node.name, typeName);


                // And now it is just the result value
            }


            builder.returnResult();


            addMethod(getAccess);


            fieldToReadMethod.put(node.name, getAccess);
        }

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            // Takes two Object parameters (instance, and value) and returns void.


            MethodNode mn = new MethodNode(ACC_SYNTHETIC | ACC_FINAL, name, "(" + node.desc + ")V", null, null);


            InstructionBuilder builder = newBuilder(mn);


            builder.loadThis().loadArgument(0).putField(className, node.name, typeName);
            builder.returnResult();


            addMethod(mn);


            fieldTransformMethods.add(mn);

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        {
            String name = makeUnique(methodNames, "shimget_" + node.name);


            MethodNode mn = new MethodNode(ACC_SYNTHETIC | ACC_FINAL, name, "()" + node.desc, null, null);


            InstructionBuilder builder = newBuilder(mn);


            builder.loadThis().getField(className, node.name, typeName).returnResult();


            addMethod(mn);


            fieldTransformMethods.add(mn);

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            String[] constructorTypes = consTypes.toArray(new String[consTypes.size()]);


            MethodNode cons = new MethodNode(ACC_PUBLIC, CONSTRUCTOR_NAME, nameCache.toMethodDescriptor("void",
                    constructorTypes), null, null);


            InstructionBuilder builder = newBuilder(cons);


            // First three arguments go to the super-class


            builder.loadThis();
            builder.loadArgument(0);
            builder.loadArgument(1);
            builder.loadArgument(2);
            builder.invokeConstructor(AbstractMethodInvocation.class, Object.class, InstanceContext.class,
                    MethodInvocationBundle.class);


            for (int i = 0; i < description.argumentTypes.length; i++)
            {
                String name = "p" + i;
                String type = description.argumentTypes[i];


                builder.loadThis();
                builder.loadArgument(3 + i);
                builder.putField(invocationClassName, name, type);
            }


            builder.returnResult();


            invocationClassNode.methods.add(cons);


            return constructorTypes;
        }

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            return newBuilder(mn);
        }


        private void createReturnValueGetter()
        {
            InstructionBuilder builder = newMethod("getReturnValue", Object.class);


            if (isVoid)
            {
                builder.loadNull().returnResult();
            }
            else
            {
                builder.loadThis().getField(invocationClassName, RETURN_VALUE, description.returnType)
                        .boxPrimitive(description.returnType).returnResult();
            }
        }

View Full Code Here

            }
        }


        private void addReturnValueSetter()
        {
            InstructionBuilder builder = newMethod("setReturnValue", MethodInvocation.class, Object.class);


            if (isVoid)
            {
                builder.throwException(IllegalArgumentException.class, String
                        .format("Method %s of class %s is void, setting a return value is not allowed.", description,
                                className));
            }
            else
            {
                builder.loadThis().loadArgument(0);
                builder.castOrUnbox(description.returnType);
                builder.putField(invocationClassName, RETURN_VALUE, description.returnType);


                builder.loadThis().invoke(AbstractMethodInvocation.class, void.class, "clearCheckedException");


                builder.loadThis().returnResult();
            }
        }

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            }
        }


        private void createGetParameter()
        {
            InstructionBuilder builder = newMethod("getParameter", Object.class, int.class);


            if (description.argumentTypes.length == 0)
            {
                indexOutOfRange(builder);
            }
            else
            {
                builder.loadArgument(0);
                builder.startSwitch(0, description.argumentTypes.length - 1, new SwitchCallback()
                {


                    public void doSwitch(SwitchBlock block)
                    {
                        for (int i = 0; i < description.argumentTypes.length; i++)
                        {
                            final int index = i;


                            block.addCase(i, false, new InstructionBuilderCallback()
                            {


                                public void doBuild(InstructionBuilder builder)
                                {
                                    String type = description.argumentTypes[index];


                                    builder.loadThis();
                                    builder.getField(invocationClassName, "p" + index, type).boxPrimitive(type)
                                            .returnResult();
                                }
                            });
                        }
                    }

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