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

Introduction

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

Prototype

public void ifeq(final Label label) 

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();/*from   w  w w.jav a2 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

/**
 * Emit code to restore the previous Nashorn Context when needed.
 * @param mv the instruction adapter//from   ww  w . j  a  va 2  s . c o m
 * @param currentGlobalVar index of the local variable holding the reference to the current global at method
 * entry.
 * @param globalsDifferVar index of the boolean local variable that is true if the global needs to be restored.
 */
private static void emitFinally(final InstructionAdapter mv, final int currentGlobalVar,
        final int globalsDifferVar) {
    // Emit code to restore the previous Nashorn global if needed
    mv.visitVarInsn(ILOAD, globalsDifferVar);
    final Label skip = new Label();
    mv.ifeq(skip);
    mv.visitVarInsn(ALOAD, currentGlobalVar);
    invokeSetGlobal(mv);
    mv.visitLabel(skip);
}

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