C++ XPCNativeInterface::GetNameString方法代码示例

/**
 * Get the interface name and member name (for error messages).
 *
 * We could instead have each quick stub pass its name to the error-handling
 * functions, as that name is statically known.  But that would be redundant;
 * the information is handy at runtime anyway.  Also, this code often produces
 * a more specific error message, e.g. "[nsIDOMHTMLDocument.appendChild]"
 * rather than "[nsIDOMNode.appendChild]".
 */
static void
GetMemberInfo(JSObject *obj, jsid memberId, const char **ifaceName)
{
    *ifaceName = "Unknown";

    // Don't try to generate a useful name if there are security wrappers,
    // because it isn't worth the risk of something going wrong just to generate
    // an error message. Instead, only handle the simple case where we have the
    // reflector in hand.
    if (IS_WRAPPER_CLASS(js::GetObjectClass(obj))) {
        XPCWrappedNativeProto *proto;
        if (IS_SLIM_WRAPPER_OBJECT(obj)) {
            proto = GetSlimWrapperProto(obj);
        } else {
            MOZ_ASSERT(IS_WN_WRAPPER_OBJECT(obj));
            XPCWrappedNative *wrapper =
                static_cast<XPCWrappedNative *>(js::GetObjectPrivate(obj));
            proto = wrapper->GetProto();
        }
        if (proto) {
            XPCNativeSet *set = proto->GetSet();
            if (set) {
                XPCNativeMember *member;
                XPCNativeInterface *iface;

                if (set->FindMember(memberId, &member, &iface))
                    *ifaceName = iface->GetNameString();
            }
        }
    }
}

// static
void
XPCThrower::Verbosify(XPCCallContext& ccx,
                      char** psz, PRBool own)
{
    char* sz = nsnull;

    if(ccx.HasInterfaceAndMember())
    {
        XPCNativeInterface* iface = ccx.GetInterface();
        jsid id = ccx.GetMember()->GetName();
        JSAutoByteString bytes;
        const char *name = JSID_IS_VOID(id) ? "Unknown" : bytes.encode(ccx, JSID_TO_STRING(id));
        if(!name)
        {
            name = "";
        }
        sz = JS_smprintf("%s [%s.%s]", *psz, iface->GetNameString(), name);
    }

    if(sz)
    {
        if(own)
            JS_smprintf_free(*psz);
        *psz = sz;
    }
}

// static
void
XPCThrower::Verbosify(XPCCallContext& ccx,
                      char** psz, PRBool own)
{
    char* sz = nsnull;

    if(ccx.HasInterfaceAndMember())
    {
        XPCNativeInterface* iface = ccx.GetInterface();
#ifdef XPC_IDISPATCH_SUPPORT
        NS_ASSERTION(ccx.GetIDispatchMember() == nsnull || 
                        ccx.GetMember() == nsnull,
                     "Both IDispatch member and regular XPCOM member "
                     "were set in XPCCallContext");
        char const * name;
        if(ccx.GetIDispatchMember())
        {
            XPCDispInterface::Member * member = 
                reinterpret_cast<XPCDispInterface::Member*>(ccx.GetIDispatchMember());
            if(member && JSVAL_IS_STRING(member->GetName()))
            {
                name = JS_GetStringBytes(JSVAL_TO_STRING(member->GetName()));
            }
            else
                name = "Unknown";
        }
        else
            name = iface->GetMemberName(ccx, ccx.GetMember());
        sz = JS_smprintf("%s [%s.%s]",
                         *psz,
                         iface->GetNameString(),
                         name);
#else
        sz = JS_smprintf("%s [%s.%s]",
                         *psz,
                         iface->GetNameString(),
                         iface->GetMemberName(ccx, ccx.GetMember()));
#endif
    }

    if(sz)
    {
        if(own)
            JS_smprintf_free(*psz);
        *psz = sz;
    }
}

// static
void
XPCThrower::Verbosify(XPCCallContext& ccx,
                      char** psz, PRBool own)
{
    char* sz = nsnull;

    if(ccx.HasInterfaceAndMember())
    {
        XPCNativeInterface* iface = ccx.GetInterface();
        jsid id = JSID_VOID;
#ifdef XPC_IDISPATCH_SUPPORT
        NS_ASSERTION(ccx.GetIDispatchMember() == nsnull || 
                        ccx.GetMember() == nsnull,
                     "Both IDispatch member and regular XPCOM member "
                     "were set in XPCCallContext");
        if(ccx.GetIDispatchMember())
        {
            XPCDispInterface::Member * member = 
                reinterpret_cast<XPCDispInterface::Member*>(ccx.GetIDispatchMember());
            if(member && JSID_IS_STRING(member->GetName()))
            {
                id = member->GetName();
            }
        }
        else
#endif
        {
            id = ccx.GetMember()->GetName();
        }
        JSAutoByteString bytes;
        const char *name = JSID_IS_VOID(id) ? "Unknown" : bytes.encode(ccx, JSID_TO_STRING(id));
        if(!name)
        {
            name = "";
        }
        sz = JS_smprintf("%s [%s.%s]", *psz, iface->GetNameString(), name);
    }

    if(sz)
    {
        if(own)
            JS_smprintf_free(*psz);
        *psz = sz;
    }
}

/**
 * Get the interface name and member name (for error messages).
 *
 * We could instead have each quick stub pass its name to the error-handling
 * functions, as that name is statically known.  But that would be redundant;
 * the information is handy at runtime anyway.  Also, this code often produces
 * a more specific error message, e.g. "[nsIDOMHTMLDocument.appendChild]"
 * rather than "[nsIDOMNode.appendChild]".
 */
static void
GetMemberInfo(JSObject *obj,
              jsval memberId,
              const char **ifaceName,
              const char **memberName)
{
    // Get the interface name.  From DefinePropertyIfFound (in
    // xpcwrappednativejsops.cpp) and XPCThrower::Verbosify.
    //
    // We could instead make the quick stub could pass in its interface name,
    // but this code often produces a more specific error message, e.g.
    *ifaceName = "Unknown";

    NS_ASSERTION(IS_WRAPPER_CLASS(STOBJ_GET_CLASS(obj)) ||
                 STOBJ_GET_CLASS(obj) == &XPC_WN_Tearoff_JSClass ||
                 IS_SLIM_WRAPPER(obj),
                 "obj must be a wrapper");
    XPCWrappedNativeProto *proto;
    if(IS_SLIM_WRAPPER(obj))
    {
        proto = GetSlimWrapperProto(obj);
    }
    else
    {
        XPCWrappedNative *wrapper = (XPCWrappedNative *) obj->getPrivate();
        proto = wrapper->GetProto();
    }
    if(proto)
    {
        XPCNativeSet *set = proto->GetSet();
        if(set)
        {
            XPCNativeMember *member;
            XPCNativeInterface *iface;

            if(set->FindMember(memberId, &member, &iface))
                *ifaceName = iface->GetNameString();
        }
    }

    *memberName = (JSVAL_IS_STRING(memberId)
                   ? JS_GetStringBytes(JSVAL_TO_STRING(memberId))
                   : "unknown");
}

/**
 * Get the interface name and member name (for error messages).
 *
 * We could instead have each quick stub pass its name to the error-handling
 * functions, as that name is statically known.  But that would be redundant;
 * the information is handy at runtime anyway.  Also, this code often produces
 * a more specific error message, e.g. "[nsIDOMHTMLDocument.appendChild]"
 * rather than "[nsIDOMNode.appendChild]".
 */
static void
GetMemberInfo(JSObject *obj, jsid memberId, const char **ifaceName)
{
    *ifaceName = "Unknown";

    // Don't try to generate a useful name if there are security wrappers,
    // because it isn't worth the risk of something going wrong just to generate
    // an error message. Instead, only handle the simple case where we have the
    // reflector in hand.
    if (IS_WN_REFLECTOR(obj)) {
        XPCWrappedNative *wrapper = XPCWrappedNative::Get(obj);
        XPCWrappedNativeProto *proto = wrapper->GetProto();
        if (proto) {
            XPCNativeSet *set = proto->GetSet();
            if (set) {
                XPCNativeMember *member;
                XPCNativeInterface *iface;

                if (set->FindMember(memberId, &member, &iface))
                    *ifaceName = iface->GetNameString();
            }
        }
    }
}