Package webit.script.asm.lib

Examples of webit.script.asm.lib.MethodWriter

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        m.visitMethodInsn(Constants.INVOKESPECIAL, "webit/script/exceptions/ScriptRuntimeException", "<init>", "(Ljava/lang/String;)V");
        m.visitInsn(Constants.ATHROW);
    }

    static void visitConstructor(ClassWriter classWriter) {
        MethodWriter m = classWriter.visitMethod(Constants.ACC_PUBLIC, "<init>", "()V", null);
        m.visitVarInsn(Constants.ALOAD, 0);
        m.visitMethodInsn(Constants.INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        m.visitInsn(Constants.RETURN);
        m.visitMaxs();
    }
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            visitXetMethod(true, classWriter, beanClass, all, hashs, indexer);
            visitXetMethod(false, classWriter, beanClass, all, hashs, indexer);

            //getMatchClass
            final MethodWriter m = classWriter.visitMethod(Constants.ACC_PUBLIC, "getMatchClass", "()Ljava/lang/Class;", null);
            m.visitInsn(Constants.ACONST_NULL);
            m.visitInsn(Constants.ARETURN);
            m.visitMaxs();

            return ASMUtil.loadClass(className, classWriter);
        } else {
            throw new Exception(StringUtil.format("Class [{}] is not public", beanClass));
        }
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    }

    private static void visitXetMethod(final boolean isGetter, final ClassWriter classWriter, final Class beanClass, final FieldInfo[] all, final int[] hashs, final int[] indexer) {
        final String beanName = ASMUtil.getBoxedInternalName(beanClass);
        final MethodWriter m;
        if (isGetter) {
            m = classWriter.visitMethod(Constants.ACC_PUBLIC, "get", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;", null);
        } else {
            m = classWriter.visitMethod(Constants.ACC_PUBLIC, "set", "(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)V", null);
        }
        final int fieldInfosLength = all.length;
        if (fieldInfosLength != 0) {
            final Label finalEndLabel = new Label();
            if (fieldInfosLength < 4) {
                visitXetFields(isGetter, m, all, 0, fieldInfosLength, beanName, finalEndLabel);
            } else {
                m.visitVarInsn(Constants.ALOAD, 2);
                m.invokeVirtual("java/lang/Object", "hashCode", "()I");

                final int size = hashs.length;
                Label[] labels = new Label[size];
                for (int i = 0; i < size; i++) {
                    labels[i] = new Label();
                }

                m.visitLookupSwitchInsn(finalEndLabel, hashs, labels);
                int start = 0;
                for (int i = 0; i < size; i++) {
                    int end = indexer[i];
                    m.visitLabel(labels[i]);
                    visitXetFields(isGetter, m, all, start, end, beanName, finalEndLabel);
                    start = end;
                }
            }
            m.visitLabel(finalEndLabel);
        }
        //Exception
        m.visitTypeInsn(Constants.NEW, "webit/script/exceptions/ScriptRuntimeException");
        m.visitInsn(Constants.DUP);
        m.visitLdcInsn(StringUtil.concat("Invalid property ", beanClass.getName(), "#"));
        m.visitVarInsn(Constants.ALOAD, 2);
        m.invokeStatic("java/lang/String", "valueOf", "(Ljava/lang/Object;)Ljava/lang/String;");
        m.invokeVirtual("java/lang/String", "concat", "(Ljava/lang/String;)Ljava/lang/String;");
        m.visitMethodInsn(Constants.INVOKESPECIAL, "webit/script/exceptions/ScriptRuntimeException", "<init>", "(Ljava/lang/String;)V");
        m.visitInsn(Constants.ATHROW);
        m.visitMaxs();
    }
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            paramTypes = constructor.getParameterTypes();
            returnType = constructor.getDeclaringClass();
        }

        final int paramTypesLen = paramTypes.length;
        final MethodWriter m = classWriter.visitMethod(Constants.ACC_PUBLIC, "invoke", "(Lwebit/script/Context;[Ljava/lang/Object;)Ljava/lang/Object;", null);

        if (paramTypesLen == 0) {
            if (isStatic) {
                m.invokeStatic(ownerClass, destName, destDesc);
                ASMUtil.visitBoxIfNeed(m, returnType);
                m.visitInsn(Constants.ARETURN);
            } else if (isConstructor) {
                m.visitTypeInsn(Constants.NEW, ownerClass);
                m.visitInsn(Constants.DUP);
                m.visitMethodInsn(Constants.INVOKESPECIAL, ownerClass, "<init>", "()V");
                m.visitInsn(Constants.ARETURN);
            } else {
                Label toExcaption = new Label();
                m.visitVarInsn(Constants.ALOAD, 2);
                m.visitJumpInsn(Constants.IFNULL, toExcaption);
                m.visitVarInsn(Constants.ALOAD, 2);
                m.visitInsn(Constants.ARRAYLENGTH);
                m.visitJumpInsn(Constants.IFEQ, toExcaption);
                m.visitVarInsn(Constants.ALOAD, 2);
                m.visitInsn(Constants.ICONST_0);
                m.visitInsn(Constants.AALOAD);
                m.visitJumpInsn(Constants.IFNULL, toExcaption);
                m.visitVarInsn(Constants.ALOAD, 2);
                m.visitInsn(Constants.ICONST_0);
                m.visitInsn(Constants.AALOAD);
                m.checkCast(ownerClass);
                m.visitMethodInsn(isInterface ? Constants.INVOKEINTERFACE
                        : Constants.INVOKEVIRTUAL, ownerClass, destName, destDesc);
                ASMUtil.visitBoxIfNeed(m, returnType);
                m.visitInsn(Constants.ARETURN);
                m.visitLabel(toExcaption);
                ASMUtil.visitScriptRuntimeException(m, "First argument can't be null.");
            }
        } else {
            if (isConstructor) {
                m.visitTypeInsn(Constants.NEW, ownerClass);
                m.visitInsn(Constants.DUP);
            }

            m.visitVarInsn(Constants.ALOAD, 2);

            m.push(isStatic || isConstructor ? paramTypesLen : paramTypesLen + 1);
            m.invokeStatic("webit/script/util/ArrayUtil", "ensureMinSize", "([Ljava/lang/Object;I)[Ljava/lang/Object;");
            m.visitVarInsn(Constants.ASTORE, 2);

            int paramCount = 0;
            if (!isStatic && !isConstructor) {
                m.visitVarInsn(Constants.ALOAD, 2);
                m.visitInsn(Constants.ICONST_0);
                m.visitInsn(Constants.AALOAD);
                m.checkCast(ownerClass);
                paramCount++;
            }

            for (Class paramType : paramTypes) {
                m.visitVarInsn(Constants.ALOAD, 2);
                m.push(paramCount);
                m.visitInsn(Constants.AALOAD);
                m.checkCast(ASMUtil.getBoxedInternalName(paramType));
                ASMUtil.visitUnboxIfNeed(m, paramType);
                paramCount++;
            }

            //Invoke Method
            m.visitMethodInsn(isStatic ? Constants.INVOKESTATIC
                    : isConstructor ? Constants.INVOKESPECIAL : isInterface ? Constants.INVOKEINTERFACE
                    : Constants.INVOKEVIRTUAL, ownerClass, destName, destDesc);
            ASMUtil.visitBoxIfNeed(m, returnType);
            m.visitInsn(Constants.ARETURN);
        }
        m.visitMaxs();

        return (MethodDeclare) ASMUtil.loadClass(className, classWriter).newInstance();
    }
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    public void test() throws Exception {
        ClassWriter clssWriter = new ClassWriter(Constants.V1_5, Constants.ACC_PUBLIC, "x/Example", "java/lang/Object", null);

        ASMUtil.visitConstructor(clssWriter);

        MethodWriter m = clssWriter.visitMethod(ACC_PUBLIC, "test", "([Ljava/lang/Object;)Ljava/lang/Object;", null);

        Label toExcaption = new Label();
        m.visitVarInsn(Constants.ALOAD, 1);
        m.visitJumpInsn(Constants.IFNULL, toExcaption);
        m.visitVarInsn(Constants.ALOAD, 1);
        m.visitInsn(Constants.ARRAYLENGTH);
        m.visitJumpInsn(Constants.IFEQ, toExcaption);
        m.visitVarInsn(Constants.ALOAD, 1);
        m.visitInsn(Constants.ICONST_0); //m.visitIntInsn(Constants.SIPUSH, 17);
       
        m.visitInsn(Constants.AALOAD);
        m.visitJumpInsn(Constants.IFNULL, toExcaption);
        m.visitVarInsn(Constants.ALOAD, 1);
        m.visitInsn(Constants.ICONST_0);
        m.visitInsn(Constants.AALOAD);
        m.visitTypeInsn(Constants.CHECKCAST, "java/lang/String");
        m.visitMethodInsn(Constants.INVOKEVIRTUAL, "java/lang/String", "length", "()I");
        ASMUtil.visitBoxIfNeed(m, int.class);
        m.visitInsn(Constants.ARETURN);
        m.visitLabel(toExcaption);
        ASMUtil.visitScriptRuntimeException(m, "First argument can't be null.");
        m.visitMaxs();

        Class exampleClass = ASMUtil.loadClass("x.Example", clssWriter);

        try {
            Object obj = exampleClass.newInstance();
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Related Classes of webit.script.asm.lib.MethodWriter

  • webit.script.asm.AsmNativeFactory
  • webit.script.asm.AsmResolverManager
  • webit.script.asm.AsmTest
  • webit.script.asm.ASMUtil
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