Java Code Examples for jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor#isScope()

/**
 * Fall back if a function property is not found.
 * @param desc The call site descriptor
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String       name      = desc.getNameToken(2);
    final FindProperty find      = findProperty(NO_SUCH_METHOD_NAME, true);
    final boolean      scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find == null) {
        return noSuchProperty(desc, request);
    }

    final Object value = getObjectValue(find);
    if (! (value instanceof ScriptFunction)) {
        return createEmptyGetter(desc, name);
    }

    final ScriptFunction func = (ScriptFunction)value;
    final Object thiz = scopeCall && func.isStrict() ? ScriptRuntime.UNDEFINED : this;
    // TODO: It'd be awesome if we could bind "name" without binding "this".
    return new GuardedInvocation(MH.dropArguments(MH.constant(ScriptFunction.class,
            func.makeBoundFunction(thiz, new Object[] { name })), 0, Object.class),
            null, NashornGuards.getMapGuard(getMap()));
}
 

@Override
public GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final boolean isScope = NashornCallSiteDescriptor.isScope(desc);

    if (lexicalScope != null && isScope) {
        final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
        if (lexicalScope.hasOwnProperty(name)) {
            return lexicalScope.findSetMethod(desc, request);
        }
    }

    final GuardedInvocation invocation = super.findSetMethod(desc, request);

    if (isScope && context.getEnv()._es6) {
        return invocation.addSwitchPoint(getLexicalScopeSwitchPoint());
    }

    return invocation;
}
 

@Override
public GuardedInvocation findGetMethod(final CallSiteDescriptor desc, final LinkRequest request, final String operator) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    final boolean isScope = NashornCallSiteDescriptor.isScope(desc);

    if (lexicalScope != null && isScope && !NashornCallSiteDescriptor.isApplyToCall(desc)) {
        if (lexicalScope.hasOwnProperty(name)) {
            return lexicalScope.findGetMethod(desc, request, operator);
        }
    }

    final GuardedInvocation invocation =  super.findGetMethod(desc, request, operator);

    // We want to avoid adding our generic lexical scope switchpoint to global constant invocations,
    // because those are invalidated per-key in the addBoundProperties method above.
    // We therefore check if the invocation does already have a switchpoint and the property is non-inherited,
    // assuming this only applies to global constants. If other non-inherited properties will
    // start using switchpoints some time in the future we'll have to revisit this.
    if (isScope && context.getEnv()._es6 && (invocation.getSwitchPoints() == null || !hasOwnProperty(name))) {
        return invocation.addSwitchPoint(getLexicalScopeSwitchPoint());
    }

    return invocation;
}
 

@Override
public GuardedInvocation findGetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = NashornCallSiteDescriptor.getOperand(desc);
    final boolean isScope = NashornCallSiteDescriptor.isScope(desc);

    if (lexicalScope != null && isScope && !NashornCallSiteDescriptor.isApplyToCall(desc)) {
        if (lexicalScope.hasOwnProperty(name)) {
            return lexicalScope.findGetMethod(desc, request);
        }
    }

    final GuardedInvocation invocation =  super.findGetMethod(desc, request);

    // We want to avoid adding our generic lexical scope switchpoint to global constant invocations,
    // because those are invalidated per-key in the addBoundProperties method above.
    // We therefore check if the invocation does already have a switchpoint and the property is non-inherited,
    // assuming this only applies to global constants. If other non-inherited properties will
    // start using switchpoints some time in the future we'll have to revisit this.
    if (isScope && context.getEnv()._es6 && (invocation.getSwitchPoints() == null || !hasOwnProperty(name))) {
        return invocation.addSwitchPoint(getLexicalScopeSwitchPoint());
    }

    return invocation;
}
 

@Override
public GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final boolean isScope = NashornCallSiteDescriptor.isScope(desc);

    if (lexicalScope != null && isScope) {
        final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
        if (lexicalScope.hasOwnProperty(name)) {
            return lexicalScope.findSetMethod(desc, request);
        }
    }

    final GuardedInvocation invocation = super.findSetMethod(desc, request);

    if (isScope && context.getEnv()._es6) {
        return invocation.addSwitchPoint(getLexicalScopeSwitchPoint());
    }

    return invocation;
}
 

@Override
public GuardedInvocation findGetMethod(final CallSiteDescriptor desc, final LinkRequest request, final String operator) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    final boolean isScope = NashornCallSiteDescriptor.isScope(desc);

    if (lexicalScope != null && isScope && !NashornCallSiteDescriptor.isApplyToCall(desc)) {
        if (lexicalScope.hasOwnProperty(name)) {
            return lexicalScope.findGetMethod(desc, request, operator);
        }
    }

    final GuardedInvocation invocation =  super.findGetMethod(desc, request, operator);

    // We want to avoid adding our generic lexical scope switchpoint to global constant invocations,
    // because those are invalidated per-key in the addBoundProperties method above.
    // We therefore check if the invocation does already have a switchpoint and the property is non-inherited,
    // assuming this only applies to global constants. If other non-inherited properties will
    // start using switchpoints some time in the future we'll have to revisit this.
    if (isScope && context.getEnv()._es6 && (invocation.getSwitchPoints() == null || !hasOwnProperty(name))) {
        return invocation.addSwitchPoint(getLexicalScopeSwitchPoint());
    }

    return invocation;
}
 

@Override
public GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final boolean isScope = NashornCallSiteDescriptor.isScope(desc);

    if (lexicalScope != null && isScope) {
        final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
        if (lexicalScope.hasOwnProperty(name)) {
            return lexicalScope.findSetMethod(desc, request);
        }
    }

    final GuardedInvocation invocation = super.findSetMethod(desc, request);

    if (isScope && context.getEnv()._es6) {
        return invocation.addSwitchPoint(getLexicalScopeSwitchPoint());
    }

    return invocation;
}
 

@Override
public GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final boolean isScope = NashornCallSiteDescriptor.isScope(desc);

    if (lexicalScope != null && isScope) {
        final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
        if (lexicalScope.hasOwnProperty(name)) {
            return lexicalScope.findSetMethod(desc, request);
        }
    }

    final GuardedInvocation invocation = super.findSetMethod(desc, request);

    if (isScope && context.getEnv()._es6) {
        return invocation.addSwitchPoint(getLexicalScopeSwitchPoint());
    }

    return invocation;
}
 

@Override
public GuardedInvocation findGetMethod(final CallSiteDescriptor desc, final LinkRequest request, final String operator) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    final boolean isScope = NashornCallSiteDescriptor.isScope(desc);

    if (lexicalScope != null && isScope && !NashornCallSiteDescriptor.isApplyToCall(desc)) {
        if (lexicalScope.hasOwnProperty(name)) {
            return lexicalScope.findGetMethod(desc, request, operator);
        }
    }

    final GuardedInvocation invocation =  super.findGetMethod(desc, request, operator);

    // We want to avoid adding our generic lexical scope switchpoint to global constant invocations,
    // because those are invalidated per-key in the addBoundProperties method above.
    // We therefor check if the invocation does already have a switchpoint and the property is non-inherited,
    // assuming this only applies to global constants. If other non-inherited properties will
    // start using switchpoints some time in the future we'll have to revisit this.
    if (isScope && context.getEnv()._es6 && (invocation.getSwitchPoints() == null || !hasOwnProperty(name))) {
        return invocation.addSwitchPoint(getLexicalScopeSwitchPoint());
    }

    return invocation;
}
 

@Override
public GuardedInvocation findGetMethod(final CallSiteDescriptor desc, final LinkRequest request, final String operator) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    final boolean isScope = NashornCallSiteDescriptor.isScope(desc);

    if (lexicalScope != null && isScope && !NashornCallSiteDescriptor.isApplyToCall(desc)) {
        if (lexicalScope.hasOwnProperty(name)) {
            return lexicalScope.findGetMethod(desc, request, operator);
        }
    }

    final GuardedInvocation invocation =  super.findGetMethod(desc, request, operator);

    // We want to avoid adding our generic lexical scope switchpoint to global constant invocations,
    // because those are invalidated per-key in the addBoundProperties method above.
    // We therefore check if the invocation does already have a switchpoint and the property is non-inherited,
    // assuming this only applies to global constants. If other non-inherited properties will
    // start using switchpoints some time in the future we'll have to revisit this.
    if (isScope && context.getEnv()._es6 && (invocation.getSwitchPoints() == null || !hasOwnProperty(name))) {
        return invocation.addSwitchPoint(getLexicalScopeSwitchPoint());
    }

    return invocation;
}
 

/**
 * Fall back if a property is not found.
 * @param desc the call site descriptor.
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
@SuppressWarnings("null")
public GuardedInvocation noSuchProperty(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    final FindProperty find = findProperty(NO_SUCH_PROPERTY_NAME, true);
    final boolean scopeAccess = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find != null) {
        final Object   value        = getObjectValue(find);
        ScriptFunction func         = null;
        MethodHandle   methodHandle = null;

        if (value instanceof ScriptFunction) {
            func = (ScriptFunction)value;
            methodHandle = getCallMethodHandle(func, desc.getMethodType(), name);
        }

        if (methodHandle != null) {
            if (scopeAccess && func.isStrict()) {
                methodHandle = bindTo(methodHandle, UNDEFINED);
            }
            return new GuardedInvocation(methodHandle,
                    find.isInherited()? getMap().getProtoGetSwitchPoint(proto, NO_SUCH_PROPERTY_NAME) : null,
                    getKnownFunctionPropertyGuard(getMap(), find.getGetter(Object.class), find.getOwner(), func));
        }
    }

    if (scopeAccess) {
        throw referenceError("not.defined", name);
    }

    return createEmptyGetter(desc, name);
}
 

/**
 * Fall back if a function property is not found.
 * @param desc The call site descriptor
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String       name      = desc.getNameToken(2);
    final FindProperty find      = findProperty(NO_SUCH_METHOD_NAME, true);
    final boolean      scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find == null) {
        return noSuchProperty(desc, request);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    final Object value = find.getObjectValue();
    if (!(value instanceof ScriptFunction)) {
        return createEmptyGetter(desc, explicitInstanceOfCheck, name);
    }

    final ScriptFunction func = (ScriptFunction)value;
    final Object         thiz = scopeCall && func.isStrict() ? UNDEFINED : this;
    // TODO: It'd be awesome if we could bind "name" without binding "this".
    // Since we're binding this we must use an identity guard here.
    return new GuardedInvocation(
            MH.dropArguments(
                    MH.constant(
                            ScriptFunction.class,
                            func.createBound(thiz, new Object[] { name })),
                    0,
                    Object.class),
            NashornGuards.combineGuards(
                    NashornGuards.getIdentityGuard(this),
                    NashornGuards.getMapGuard(getMap(), true)));
}
 

/**
 * Fall back if a function property is not found.
 * @param desc The call site descriptor
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String       name      = desc.getNameToken(2);
    final FindProperty find      = findProperty(NO_SUCH_METHOD_NAME, true);
    final boolean      scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find == null) {
        return noSuchProperty(desc, request);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    final Object value = find.getObjectValue();
    if (!(value instanceof ScriptFunction)) {
        return createEmptyGetter(desc, explicitInstanceOfCheck, name);
    }

    final ScriptFunction func = (ScriptFunction)value;
    final Object         thiz = scopeCall && func.isStrict() ? UNDEFINED : this;
    // TODO: It'd be awesome if we could bind "name" without binding "this".
    // Since we're binding this we must use an identity guard here.
    return new GuardedInvocation(
            MH.dropArguments(
                    MH.constant(
                            ScriptFunction.class,
                            func.createBound(thiz, new Object[] { name })),
                    0,
                    Object.class),
            NashornGuards.combineGuards(
                    NashornGuards.getIdentityGuard(this),
                    NashornGuards.getMapGuard(getMap(), true)));
}
 

/**
 * Fall back if a function property is not found.
 * @param desc The call site descriptor
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String       name      = desc.getNameToken(2);
    final FindProperty find      = findProperty(NO_SUCH_METHOD_NAME, true);
    final boolean      scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find == null) {
        return noSuchProperty(desc, request);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    final Object value = find.getObjectValue();
    if (!(value instanceof ScriptFunction)) {
        return createEmptyGetter(desc, explicitInstanceOfCheck, name);
    }

    final ScriptFunction func = (ScriptFunction)value;
    final Object         thiz = scopeCall && func.isStrict() ? UNDEFINED : this;
    // TODO: It'd be awesome if we could bind "name" without binding "this".
    // Since we're binding this we must use an identity guard here.
    return new GuardedInvocation(
            MH.dropArguments(
                    MH.constant(
                            ScriptFunction.class,
                            func.createBound(thiz, new Object[] { name })),
                    0,
                    Object.class),
            NashornGuards.combineGuards(
                    NashornGuards.getIdentityGuard(this),
                    NashornGuards.getMapGuard(getMap(), true)));
}
 

/**
 * Fall back if a function property is not found.
 * @param desc The call site descriptor
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String       name      = desc.getNameToken(2);
    final FindProperty find      = findProperty(NO_SUCH_METHOD_NAME, true);
    final boolean      scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find == null) {
        return noSuchProperty(desc, request);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    final Object value = find.getObjectValue();
    if (!(value instanceof ScriptFunction)) {
        return createEmptyGetter(desc, explicitInstanceOfCheck, name);
    }

    final ScriptFunction func = (ScriptFunction)value;
    final Object         thiz = scopeCall && func.isStrict() ? UNDEFINED : this;
    // TODO: It'd be awesome if we could bind "name" without binding "this".
    // Since we're binding this we must use an identity guard here.
    return new GuardedInvocation(
            MH.dropArguments(
                    MH.constant(
                            ScriptFunction.class,
                            func.createBound(thiz, new Object[] { name })),
                    0,
                    Object.class),
            NashornGuards.combineGuards(
                    NashornGuards.getIdentityGuard(this),
                    NashornGuards.getMapGuard(getMap(), true)));
}
 

private void checkStrictCreateNewVariable() {
    // In strict mode, assignment can not create a new variable.
    // See also ECMA Annex C item 4. ReferenceError is thrown.
    if (NashornCallSiteDescriptor.isScope(desc) && NashornCallSiteDescriptor.isStrict(desc)) {
        throw referenceError("not.defined", getName());
    }
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);

    if (request.isCallSiteUnstable() || hasWithScope()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
        if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
            find = null;
        }
    }

    if (find != null) {
        if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
            if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
                throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
            }
            // Existing, non-writable property
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
    } else {
        if (!isExtensible()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
        }
    }

    final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));

    final GlobalConstants globalConstants = getGlobalConstants();
    if (globalConstants != null) {
        final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
        if (cinv != null) {
            return cinv;
        }
    }

    return inv;
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = NashornCallSiteDescriptor.getOperand(desc);

    if (request.isCallSiteUnstable() || hasWithScope()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, NashornCallSiteDescriptor.isScope(desc), this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (find != null && find.isInheritedOrdinaryProperty()) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
        if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
            find = null;
        }
    }

    if (find != null) {
        if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
            if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
                throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
            }
            // Existing, non-writable data property
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        if (!find.getProperty().hasNativeSetter()) {
            // Existing accessor property without setter
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.has.no.setter", true);
        }
    } else {
        if (!isExtensible()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
        }
    }

    final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));

    final GlobalConstants globalConstants = getGlobalConstants();
    if (globalConstants != null) {
        final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
        if (cinv != null) {
            return cinv;
        }
    }

    return inv;
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);

    if (request.isCallSiteUnstable() || hasWithScope()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
        if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
            find = null;
        }
    }

    if (find != null) {
        if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
            if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
                throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
            }
            // Existing, non-writable property
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
    } else {
        if (!isExtensible()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
        }
    }

    final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));

    final GlobalConstants globalConstants = getGlobalConstants();
    if (globalConstants != null) {
        final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
        if (cinv != null) {
            return cinv;
        }
    }

    return inv;
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);

    if (request.isCallSiteUnstable() || hasWithScope()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
        if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
            find = null;
        }
    }

    if (find != null) {
        if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
            if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
                throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
            }
            // Existing, non-writable property
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
    } else {
        if (!isExtensible()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
        }
    }

    final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));

    final GlobalConstants globalConstants = getGlobalConstants();
    if (globalConstants != null) {
        final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
        if (cinv != null) {
            return cinv;
        }
    }

    return inv;
}