Example usage for org.objectweb.asm.commons InstructionAdapter checkcast

Introduction

In this page you can find the example usage for org.objectweb.asm.commons InstructionAdapter checkcast.

Prototype

public void checkcast(final Type type) 

Source Link

Usage

From source file:com.gargoylesoftware.js.nashorn.internal.runtime.linker.JavaAdapterBytecodeGenerator.java

License:Open Source License

private void generateClassInit() {
    final InstructionAdapter mv = new InstructionAdapter(
            cw.visitMethod(ACC_STATIC, CLASS_INIT, Type.getMethodDescriptor(Type.VOID_TYPE), null, null));

    mv.invokestatic(SERVICES_CLASS_TYPE_NAME, "getClassOverrides", GET_CLASS_INITIALIZER_DESCRIPTOR, false);
    final Label initGlobal;
    if (samName != null) {
        // If the class is a SAM, allow having a ScriptFunction passed as class overrides
        final Label notAFunction = new Label();
        mv.dup();// w w w  . jav a  2 s. c o m
        mv.instanceOf(SCRIPT_FUNCTION_TYPE);
        mv.ifeq(notAFunction);
        mv.checkcast(SCRIPT_FUNCTION_TYPE);

        // Assign MethodHandle fields through invoking getHandle() for a ScriptFunction, only assigning the SAM
        // method(s).
        for (final MethodInfo mi : methodInfos) {
            if (mi.getName().equals(samName)) {
                mv.dup();
                loadMethodTypeAndGetHandle(mv, mi, GET_HANDLE_FUNCTION_DESCRIPTOR);
            } else {
                mv.visitInsn(ACONST_NULL);
            }
            mv.putstatic(generatedClassName, mi.methodHandleFieldName, METHOD_HANDLE_TYPE_DESCRIPTOR);
        }
        initGlobal = new Label();
        mv.goTo(initGlobal);
        mv.visitLabel(notAFunction);
    } else {
        initGlobal = null;
    }
    // Assign MethodHandle fields through invoking getHandle() for a ScriptObject
    for (final MethodInfo mi : methodInfos) {
        mv.dup();
        mv.aconst(mi.getName());
        loadMethodTypeAndGetHandle(mv, mi, GET_HANDLE_OBJECT_DESCRIPTOR);
        mv.putstatic(generatedClassName, mi.methodHandleFieldName, METHOD_HANDLE_TYPE_DESCRIPTOR);
    }

    if (initGlobal != null) {
        mv.visitLabel(initGlobal);
    }
    // Assign "global = Context.getGlobal()"
    invokeGetGlobalWithNullCheck(mv);
    mv.putstatic(generatedClassName, GLOBAL_FIELD_NAME, GLOBAL_TYPE_DESCRIPTOR);

    generateConverterInit(mv, false);
    endInitMethod(mv);
}

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From source file:com.gargoylesoftware.js.nashorn.internal.runtime.linker.JavaAdapterBytecodeGenerator.java

License:Open Source License

private void generateFinalizerDelegate(final String finalizerDelegateName) {
    // Generate a delegate that will be invoked from the no-permission trampoline. Note it can be private, as we'll
    // refer to it with a MethodHandle constant pool entry in the overridden finalize() method (see
    // generateFinalizerOverride()).
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PRIVATE | ACC_STATIC,
            finalizerDelegateName, Type.getMethodDescriptor(Type.VOID_TYPE, OBJECT_TYPE), null, null));

    // Simply invoke super.finalize()
    mv.visitVarInsn(ALOAD, 0);/*from   w ww . j a v a 2  s .  co  m*/
    mv.checkcast(Type.getType(generatedClassName));
    mv.invokespecial(superClassName, "finalize", Type.getMethodDescriptor(Type.VOID_TYPE), false);

    mv.visitInsn(RETURN);
    endMethod(mv);
}

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