/* PRBool resolve (in nsIXPConnectWrappedNative wrapper, in JSContextPtr cx, in JSObjectPtr obj, in jsval id); */
NS_IMETHODIMP
nsJSIID::NewResolve(nsIXPConnectWrappedNative *wrapper,
JSContext * cx, JSObject * obj,
jsid id, PRUint32 flags,
JSObject * *objp, PRBool *_retval)
{
XPCCallContext ccx(JS_CALLER, cx);
AutoMarkingNativeInterfacePtr iface(ccx);
const nsIID* iid;
mInfo->GetIIDShared(&iid);
iface = XPCNativeInterface::GetNewOrUsed(ccx, iid);
if(!iface)
return NS_OK;
XPCNativeMember* member = iface->FindMember(id);
if(member && member->IsConstant())
{
jsval val;
if(!member->GetConstantValue(ccx, iface, &val))
return NS_ERROR_OUT_OF_MEMORY;
*objp = obj;
*_retval = JS_DefinePropertyById(cx, obj, id, val, nsnull, nsnull,
JSPROP_ENUMERATE | JSPROP_READONLY |
JSPROP_PERMANENT);
}
return NS_OK;
}
/* PRBool enumerate (in nsIXPConnectWrappedNative wrapper, in JSContextPtr cx, in JSObjectPtr obj); */
NS_IMETHODIMP
nsJSIID::Enumerate(nsIXPConnectWrappedNative *wrapper,
JSContext * cx, JSObject * obj, PRBool *_retval)
{
// In this case, let's just eagerly resolve...
XPCCallContext ccx(JS_CALLER, cx);
AutoMarkingNativeInterfacePtr iface(ccx);
const nsIID* iid;
mInfo->GetIIDShared(&iid);
iface = XPCNativeInterface::GetNewOrUsed(ccx, iid);
if(!iface)
return NS_OK;
PRUint16 count = iface->GetMemberCount();
for(PRUint16 i = 0; i < count; i++)
{
XPCNativeMember* member = iface->GetMemberAt(i);
if(member && member->IsConstant() &&
!xpc_ForcePropertyResolve(cx, obj, member->GetName()))
{
return NS_ERROR_UNEXPECTED;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsJSIID::Enumerate(nsIXPConnectWrappedNative* wrapper,
JSContext * cx, JSObject * objArg, bool* _retval)
{
// In this case, let's just eagerly resolve...
RootedObject obj(cx, objArg);
XPCCallContext ccx(cx);
RefPtr<XPCNativeInterface> iface =
XPCNativeInterface::GetNewOrUsed(mInfo);
if (!iface)
return NS_OK;
uint16_t count = iface->GetMemberCount();
for (uint16_t i = 0; i < count; i++) {
XPCNativeMember* member = iface->GetMemberAt(i);
if (member && member->IsConstant() &&
!xpc_ForcePropertyResolve(cx, obj, member->GetName())) {
return NS_ERROR_UNEXPECTED;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsJSIID::Resolve(nsIXPConnectWrappedNative* wrapper,
JSContext * cx, JSObject * objArg,
jsid idArg, bool* resolvedp,
bool* _retval)
{
RootedObject obj(cx, objArg);
RootedId id(cx, idArg);
XPCCallContext ccx(JS_CALLER, cx);
AutoMarkingNativeInterfacePtr iface(ccx);
iface = XPCNativeInterface::GetNewOrUsed(mInfo);
if (!iface)
return NS_OK;
XPCNativeMember* member = iface->FindMember(id);
if (member && member->IsConstant()) {
RootedValue val(cx);
if (!member->GetConstantValue(ccx, iface, val.address()))
return NS_ERROR_OUT_OF_MEMORY;
*resolvedp = true;
*_retval = JS_DefinePropertyById(cx, obj, id, val,
JSPROP_ENUMERATE | JSPROP_READONLY |
JSPROP_PERMANENT | JSPROP_RESOLVING);
}
return NS_OK;
}
bool
XPC_WN_GetterSetter(JSContext* cx, unsigned argc, Value* vp)
{
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
MOZ_ASSERT(JS_TypeOfValue(cx, args.calleev()) == JSTYPE_FUNCTION, "bad function");
RootedObject funobj(cx, &args.callee());
RootedObject obj(cx, JS_THIS_OBJECT(cx, vp));
if (!obj)
return false;
obj = FixUpThisIfBroken(obj, funobj);
XPCCallContext ccx(cx, obj, funobj, JSID_VOIDHANDLE, args.length(),
args.array(), vp);
XPCWrappedNative* wrapper = ccx.GetWrapper();
THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
RefPtr<XPCNativeInterface> iface;
XPCNativeMember* member;
if (!XPCNativeMember::GetCallInfo(funobj, &iface, &member))
return Throw(NS_ERROR_XPC_CANT_GET_METHOD_INFO, cx);
if (args.length() != 0 && member->IsWritableAttribute()) {
ccx.SetCallInfo(iface, member, true);
bool retval = XPCWrappedNative::SetAttribute(ccx);
if (retval)
args.rval().set(args[0]);
return retval;
}
// else...
ccx.SetCallInfo(iface, member, false);
return XPCWrappedNative::GetAttribute(ccx);
}
XPCWrappedNative*
XPCCallContext::UnwrapThisIfAllowed(HandleObject obj, HandleObject fun, unsigned argc)
{
// We should only get here for objects that aren't safe to unwrap.
MOZ_ASSERT(!js::CheckedUnwrap(obj));
MOZ_ASSERT(js::IsObjectInContextCompartment(obj, mJSContext));
// We can't do anything here without a function.
if (!fun)
return nullptr;
// Determine if we're allowed to unwrap the security wrapper to invoke the
// method.
//
// We have the Interface and Member that this corresponds to, but
// unfortunately our access checks are based on the object class name and
// property name. So we cheat a little bit here - we verify that the object
// does indeed implement the method's Interface, and then just check that we
// can successfully access property with method's name from the object.
// First, get the XPCWN out of the underlying object. We should have a wrapper
// here, potentially an outer window proxy, and then an XPCWN.
MOZ_ASSERT(js::IsWrapper(obj));
RootedObject unwrapped(mJSContext, js::UncheckedUnwrap(obj, /* stopAtOuter = */ false));
#ifdef DEBUG
JS::Rooted<JSObject*> wrappedObj(mJSContext, js::Wrapper::wrappedObject(obj));
MOZ_ASSERT(unwrapped == JS_ObjectToInnerObject(mJSContext, wrappedObj));
#endif
// Make sure we have an XPCWN, and grab it.
if (!IS_WN_REFLECTOR(unwrapped))
return nullptr;
XPCWrappedNative *wn = XPCWrappedNative::Get(unwrapped);
// Next, get the call info off the function object.
XPCNativeInterface *interface;
XPCNativeMember *member;
XPCNativeMember::GetCallInfo(fun, &interface, &member);
// To be extra safe, make sure that the underlying native implements the
// interface before unwrapping. Even if we didn't check this, we'd still
// theoretically fail during tearoff lookup for mismatched methods.
if (!wn->HasInterfaceNoQI(*interface->GetIID()))
return nullptr;
// See if the access is permitted.
//
// NB: This calculation of SET vs GET is a bit wonky, but that's what
// XPC_WN_GetterSetter does.
bool set = argc && argc != NO_ARGS && member->IsWritableAttribute();
js::Wrapper::Action act = set ? js::Wrapper::SET : js::Wrapper::GET;
const js::Wrapper *handler = js::Wrapper::wrapperHandler(obj);
bool ignored;
JS::Rooted<jsid> id(mJSContext, member->GetName());
if (!handler->enter(mJSContext, obj, id, act, &ignored))
return nullptr;
// Ok, this call is safe.
return wn;
}
static bool
XPC_WN_Shared_toPrimitive(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
RootedObject obj(cx);
if (!JS_ValueToObject(cx, args.thisv(), &obj))
return false;
XPCCallContext ccx(cx, obj);
XPCWrappedNative* wrapper = ccx.GetWrapper();
THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
JSType hint;
if (!GetFirstArgumentAsTypeHint(cx, args, &hint))
return false;
if (hint == JSTYPE_NUMBER) {
args.rval().set(JS_GetNaNValue(cx));
return true;
}
MOZ_ASSERT(hint == JSTYPE_STRING || hint == JSTYPE_VOID);
ccx.SetName(ccx.GetContext()->GetStringID(XPCJSContext::IDX_TO_STRING));
ccx.SetArgsAndResultPtr(0, nullptr, args.rval().address());
XPCNativeMember* member = ccx.GetMember();
if (member && member->IsMethod()) {
if (!XPCWrappedNative::CallMethod(ccx))
return false;
if (args.rval().isPrimitive())
return true;
}
// else...
return ToStringGuts(ccx);
}
bool
XPC_WN_Shared_Enumerate(JSContext* cx, HandleObject obj)
{
XPCCallContext ccx(cx, obj);
XPCWrappedNative* wrapper = ccx.GetWrapper();
THROW_AND_RETURN_IF_BAD_WRAPPER(cx, wrapper);
// Since we aren't going to enumerate tearoff names and the prototype
// handles non-mutated members, we can do this potential short-circuit.
if (!wrapper->HasMutatedSet())
return true;
XPCNativeSet* set = wrapper->GetSet();
XPCNativeSet* protoSet = wrapper->HasProto() ?
wrapper->GetProto()->GetSet() : nullptr;
uint16_t interface_count = set->GetInterfaceCount();
XPCNativeInterface** interfaceArray = set->GetInterfaceArray();
for (uint16_t i = 0; i < interface_count; i++) {
XPCNativeInterface* iface = interfaceArray[i];
uint16_t member_count = iface->GetMemberCount();
for (uint16_t k = 0; k < member_count; k++) {
XPCNativeMember* member = iface->GetMemberAt(k);
jsid name = member->GetName();
// Skip if this member is going to come from the proto.
uint16_t index;
if (protoSet &&
protoSet->FindMember(name, nullptr, &index) && index == i)
continue;
if (!xpc_ForcePropertyResolve(cx, obj, name))
return false;
}
}
return true;
}
static bool
ResolveNativeProperty(JSContext *cx, JSObject *wrapper, JSObject *holder, jsid id, bool set,
JSPropertyDescriptor *desc)
{
desc->obj = NULL;
NS_ASSERTION(holder->getJSClass() == &HolderClass, "expected a native property holder object");
JSObject *wnObject = GetWrappedNativeObjectFromHolder(holder);
XPCWrappedNative *wn = GetWrappedNative(wnObject);
// This will do verification and the method lookup for us.
XPCCallContext ccx(JS_CALLER, cx, wnObject, nsnull, id);
// There are no native numeric properties, so we can shortcut here. We will not
// find the property.
if (!JSID_IS_ATOM(id)) {
/* Not found */
return true;
}
XPCNativeInterface *iface;
XPCNativeMember *member;
if (ccx.GetWrapper() != wn ||
!wn->IsValid() ||
!(iface = ccx.GetInterface()) ||
!(member = ccx.GetMember())) {
/* Not found */
return true;
}
desc->obj = holder;
desc->attrs = JSPROP_ENUMERATE;
desc->getter = NULL;
desc->setter = NULL;
desc->shortid = 0;
desc->value = JSVAL_VOID;
jsval fval = JSVAL_VOID;
if (member->IsConstant()) {
if (!member->GetConstantValue(ccx, iface, &desc->value)) {
JS_ReportError(cx, "Failed to convert constant native property to JS value");
return false;
}
} else if (member->IsAttribute()) {
// This is a getter/setter. Clone a function for it.
if (!member->NewFunctionObject(ccx, iface, wrapper, &fval)) {
JS_ReportError(cx, "Failed to clone function object for native getter/setter");
return false;
}
desc->attrs |= JSPROP_GETTER;
if (member->IsWritableAttribute())
desc->attrs |= JSPROP_SETTER;
// Make the property shared on the holder so no slot is allocated
// for it. This avoids keeping garbage alive through that slot.
desc->attrs |= JSPROP_SHARED;
} else {
// This is a method. Clone a function for it.
if (!member->NewFunctionObject(ccx, iface, wrapper, &desc->value)) {
JS_ReportError(cx, "Failed to clone function object for native function");
return false;
}
// Without a wrapper the function would live on the prototype. Since we
// don't have one, we have to avoid calling the scriptable helper's
// GetProperty method for this property, so stub out the getter and
// setter here explicitly.
desc->getter = JS_PropertyStub;
desc->setter = JS_StrictPropertyStub;
}
if (!JS_WrapValue(cx, &desc->value) || !JS_WrapValue(cx, &fval))
return false;
if (desc->attrs & JSPROP_GETTER)
desc->getter = CastAsJSPropertyOp(JSVAL_TO_OBJECT(fval));
if (desc->attrs & JSPROP_SETTER)
desc->setter = CastAsJSStrictPropertyOp(JSVAL_TO_OBJECT(fval));
// Define the property.
return JS_DefinePropertyById(cx, holder, id, desc->value,
desc->getter, desc->setter, desc->attrs);
}
// static
XPCNativeInterface*
XPCNativeInterface::NewInstance(XPCCallContext& ccx,
nsIInterfaceInfo* aInfo)
{
static const PRUint16 MAX_LOCAL_MEMBER_COUNT = 16;
XPCNativeMember local_members[MAX_LOCAL_MEMBER_COUNT];
XPCNativeInterface* obj = nsnull;
XPCNativeMember* members = nsnull;
int i;
JSBool failed = false;
PRUint16 constCount;
PRUint16 methodCount;
PRUint16 totalCount;
PRUint16 realTotalCount = 0;
XPCNativeMember* cur;
JSString* str = NULL;
jsid name;
jsid interfaceName;
// XXX Investigate lazy init? This is a problem given the
// 'placement new' scheme - we need to at least know how big to make
// the object. We might do a scan of methods to determine needed size,
// then make our object, but avoid init'ing *any* members until asked?
// Find out how often we create these objects w/o really looking at
// (or using) the members.
bool canScript;
if (NS_FAILED(aInfo->IsScriptable(&canScript)) || !canScript)
return nsnull;
if (NS_FAILED(aInfo->GetMethodCount(&methodCount)) ||
NS_FAILED(aInfo->GetConstantCount(&constCount)))
return nsnull;
// If the interface does not have nsISupports in its inheritance chain
// then we know we can't reflect its methods. However, some interfaces that
// are used just to reflect constants are declared this way. We need to
// go ahead and build the thing. But, we'll ignore whatever methods it may
// have.
if (!nsXPConnect::IsISupportsDescendant(aInfo))
methodCount = 0;
totalCount = methodCount + constCount;
if (totalCount > MAX_LOCAL_MEMBER_COUNT) {
members = new XPCNativeMember[totalCount];
if (!members)
return nsnull;
} else {
members = local_members;
}
// NOTE: since getters and setters share a member, we might not use all
// of the member objects.
for (i = 0; i < methodCount; i++) {
const nsXPTMethodInfo* info;
if (NS_FAILED(aInfo->GetMethodInfo(i, &info))) {
failed = true;
break;
}
// don't reflect Addref or Release
if (i == 1 || i == 2)
continue;
if (!XPCConvert::IsMethodReflectable(*info))
continue;
str = JS_InternString(ccx, info->GetName());
if (!str) {
NS_ERROR("bad method name");
failed = true;
break;
}
name = INTERNED_STRING_TO_JSID(ccx, str);
if (info->IsSetter()) {
NS_ASSERTION(realTotalCount,"bad setter");
// Note: ASSUMES Getter/Setter pairs are next to each other
// This is a rule of the typelib spec.
cur = &members[realTotalCount-1];
NS_ASSERTION(cur->GetName() == name,"bad setter");
NS_ASSERTION(cur->IsReadOnlyAttribute(),"bad setter");
NS_ASSERTION(cur->GetIndex() == i-1,"bad setter");
cur->SetWritableAttribute();
} else {
// XXX need better way to find dups
// NS_ASSERTION(!LookupMemberByID(name),"duplicate method name");
cur = &members[realTotalCount++];
cur->SetName(name);
if (info->IsGetter())
cur->SetReadOnlyAttribute(i);
else
cur->SetMethod(i);
}
}
if (!failed) {
for (i = 0; i < constCount; i++) {
const nsXPTConstant* constant;
if (NS_FAILED(aInfo->GetConstant(i, &constant))) {
failed = true;
break;
}
str = JS_InternString(ccx, constant->GetName());
if (!str) {
NS_ERROR("bad constant name");
failed = true;
break;
}
name = INTERNED_STRING_TO_JSID(ccx, str);
// XXX need better way to find dups
//NS_ASSERTION(!LookupMemberByID(name),"duplicate method/constant name");
cur = &members[realTotalCount++];
cur->SetName(name);
cur->SetConstant(i);
}
}
if (!failed) {
const char* bytes;
if (NS_FAILED(aInfo->GetNameShared(&bytes)) || !bytes ||
nsnull == (str = JS_InternString(ccx, bytes))) {
failed = true;
}
interfaceName = INTERNED_STRING_TO_JSID(ccx, str);
}
if (!failed) {
// Use placement new to create an object with the right amount of space
// to hold the members array
int size = sizeof(XPCNativeInterface);
if (realTotalCount > 1)
size += (realTotalCount - 1) * sizeof(XPCNativeMember);
void* place = new char[size];
if (place)
obj = new(place) XPCNativeInterface(aInfo, interfaceName);
if (obj) {
obj->mMemberCount = realTotalCount;
// copy valid members
if (realTotalCount)
memcpy(obj->mMembers, members,
realTotalCount * sizeof(XPCNativeMember));
}
}
if (members && members != local_members)
delete [] members;
return obj;
}
// static
XPCNativeInterface*
XPCNativeInterface::NewInstance(nsIInterfaceInfo* aInfo)
{
AutoJSContext cx;
static const uint16_t MAX_LOCAL_MEMBER_COUNT = 16;
XPCNativeMember local_members[MAX_LOCAL_MEMBER_COUNT];
XPCNativeInterface* obj = nullptr;
XPCNativeMember* members = nullptr;
int i;
bool failed = false;
uint16_t constCount;
uint16_t methodCount;
uint16_t totalCount;
uint16_t realTotalCount = 0;
XPCNativeMember* cur;
RootedString str(cx);
RootedId interfaceName(cx);
// XXX Investigate lazy init? This is a problem given the
// 'placement new' scheme - we need to at least know how big to make
// the object. We might do a scan of methods to determine needed size,
// then make our object, but avoid init'ing *any* members until asked?
// Find out how often we create these objects w/o really looking at
// (or using) the members.
bool canScript;
if (NS_FAILED(aInfo->IsScriptable(&canScript)) || !canScript)
return nullptr;
bool mainProcessScriptableOnly;
if (NS_FAILED(aInfo->IsMainProcessScriptableOnly(&mainProcessScriptableOnly)))
return nullptr;
if (mainProcessScriptableOnly && !XRE_IsParentProcess()) {
nsCOMPtr<nsIConsoleService> console(do_GetService(NS_CONSOLESERVICE_CONTRACTID));
if (console) {
const char* intfNameChars;
aInfo->GetNameShared(&intfNameChars);
nsPrintfCString errorMsg("Use of %s in content process is deprecated.", intfNameChars);
nsAutoString filename;
uint32_t lineno = 0, column = 0;
nsJSUtils::GetCallingLocation(cx, filename, &lineno, &column);
nsCOMPtr<nsIScriptError> error(do_CreateInstance(NS_SCRIPTERROR_CONTRACTID));
error->Init(NS_ConvertUTF8toUTF16(errorMsg),
filename, EmptyString(),
lineno, column, nsIScriptError::warningFlag, "chrome javascript");
console->LogMessage(error);
}
}
if (NS_FAILED(aInfo->GetMethodCount(&methodCount)) ||
NS_FAILED(aInfo->GetConstantCount(&constCount)))
return nullptr;
// If the interface does not have nsISupports in its inheritance chain
// then we know we can't reflect its methods. However, some interfaces that
// are used just to reflect constants are declared this way. We need to
// go ahead and build the thing. But, we'll ignore whatever methods it may
// have.
if (!nsXPConnect::IsISupportsDescendant(aInfo))
methodCount = 0;
totalCount = methodCount + constCount;
if (totalCount > MAX_LOCAL_MEMBER_COUNT) {
members = new XPCNativeMember[totalCount];
if (!members)
return nullptr;
} else {
members = local_members;
}
// NOTE: since getters and setters share a member, we might not use all
// of the member objects.
for (i = 0; i < methodCount; i++) {
const nsXPTMethodInfo* info;
if (NS_FAILED(aInfo->GetMethodInfo(i, &info))) {
failed = true;
break;
}
// don't reflect Addref or Release
if (i == 1 || i == 2)
continue;
if (!XPCConvert::IsMethodReflectable(*info))
continue;
str = JS_AtomizeAndPinString(cx, info->GetName());
if (!str) {
NS_ERROR("bad method name");
failed = true;
break;
}
jsid name = INTERNED_STRING_TO_JSID(cx, str);
if (info->IsSetter()) {
MOZ_ASSERT(realTotalCount,"bad setter");
// Note: ASSUMES Getter/Setter pairs are next to each other
// This is a rule of the typelib spec.
cur = &members[realTotalCount-1];
MOZ_ASSERT(cur->GetName() == name,"bad setter");
MOZ_ASSERT(cur->IsReadOnlyAttribute(),"bad setter");
MOZ_ASSERT(cur->GetIndex() == i-1,"bad setter");
cur->SetWritableAttribute();
} else {
// XXX need better way to find dups
// MOZ_ASSERT(!LookupMemberByID(name),"duplicate method name");
if (realTotalCount == XPCNativeMember::GetMaxIndexInInterface()) {
NS_WARNING("Too many members in interface");
failed = true;
break;
}
cur = &members[realTotalCount];
cur->SetName(name);
if (info->IsGetter())
cur->SetReadOnlyAttribute(i);
else
cur->SetMethod(i);
cur->SetIndexInInterface(realTotalCount);
++realTotalCount;
}
}
if (!failed) {
for (i = 0; i < constCount; i++) {
RootedValue constant(cx);
nsXPIDLCString namestr;
if (NS_FAILED(aInfo->GetConstant(i, &constant, getter_Copies(namestr)))) {
failed = true;
break;
}
str = JS_AtomizeAndPinString(cx, namestr);
if (!str) {
NS_ERROR("bad constant name");
failed = true;
break;
}
jsid name = INTERNED_STRING_TO_JSID(cx, str);
// XXX need better way to find dups
//MOZ_ASSERT(!LookupMemberByID(name),"duplicate method/constant name");
if (realTotalCount == XPCNativeMember::GetMaxIndexInInterface()) {
NS_WARNING("Too many members in interface");
failed = true;
break;
}
cur = &members[realTotalCount];
cur->SetName(name);
cur->SetConstant(i);
cur->SetIndexInInterface(realTotalCount);
++realTotalCount;
}
}
if (!failed) {
const char* bytes;
if (NS_FAILED(aInfo->GetNameShared(&bytes)) || !bytes ||
nullptr == (str = JS_AtomizeAndPinString(cx, bytes))) {
failed = true;
}
interfaceName = INTERNED_STRING_TO_JSID(cx, str);
}
if (!failed) {
// Use placement new to create an object with the right amount of space
// to hold the members array
int size = sizeof(XPCNativeInterface);
if (realTotalCount > 1)
size += (realTotalCount - 1) * sizeof(XPCNativeMember);
void* place = new char[size];
if (place)
obj = new(place) XPCNativeInterface(aInfo, interfaceName);
if (obj) {
obj->mMemberCount = realTotalCount;
// copy valid members
if (realTotalCount)
memcpy(obj->mMembers, members,
realTotalCount * sizeof(XPCNativeMember));
}
}
if (members && members != local_members)
delete [] members;
return obj;
}
