Examples of 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.
org.jplastic.core.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(InstructionBuilderCallback,TryCatchCallback) try/catch blocks}, is more DSL (domain specific language) like, 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.

Examples of org.jplastic.core.InstructionBuilder


    private void implementShimSet(ClassNode shimClassNode)
    {
        MethodNode mn = new MethodNode(ACC_PUBLIC, "set", OBJECT_INT_OBJECT_TO_VOID, null, null);


        InstructionBuilder builder = newBuilder(mn);


        // Arg 0 is the target instance
        // Arg 1 is the index
        // Arg 2 is the new value


        builder.loadArgument(0).checkcast(className);
        builder.loadArgument(2);


        builder.loadArgument(1);


        builder.startSwitch(0, nextFieldIndex - 1, new SwitchCallback()
        {
            public void doSwitch(SwitchBlock block)
            {
                for (PlasticFieldImpl f : shimFields)
                {
                    f.extendShimSet(block);
                }
            }
        });


        builder.returnResult();


        shimClassNode.methods.add(mn);
    }

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Examples of org.jplastic.core.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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Examples of org.jplastic.core.InstructionBuilder

            // 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();


            classNode.methods.add(mn);


            return name;
        }

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Examples of org.jplastic.core.InstructionBuilder

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


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


            InstructionBuilder builder = newBuilder(mn);


            pushFieldConduitOntoStack(conduitFieldName, builder);
            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", InstanceContext.class, Object.class);


            builder.returnResult();


            addMethod(mn);


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

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Examples of org.jplastic.core.InstructionBuilder

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


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


            InstructionBuilder builder = newBuilder(mn);


            // Get the correct FieldConduit object on the stack


            pushFieldConduitOntoStack(conduitFieldName, builder);


            // Now push the instance context on the stack


            pushInstanceContextFieldOntoStack(builder);


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


            builder.returnResult();


            addMethod(mn);


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

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Examples of org.jplastic.core.InstructionBuilder


            // 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);


            return mn;
        }

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Examples of org.jplastic.core.InstructionBuilder

        {
            String name = makeUnique(methodNames, "directget_" + 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);


            return mn;
        }

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Examples of org.jplastic.core.InstructionBuilder

            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,
                    MethodAdvice[].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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Examples of org.jplastic.core.InstructionBuilder

            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();
            }
        }

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Examples of org.jplastic.core.InstructionBuilder

            }
        }


        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().returnResult();
            }
        }

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