The Tor Browser: js/xpconnect/src/XPCVariant.cpp@a63d609f5ebe (annotated)

js/xpconnect/src/XPCVariant.cpp@a63d609f5ebe (annotated)

js/xpconnect/src/XPCVariant.cpp

Thu, 15 Jan 2015 15:55:04 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:55:04 +0100
branch: TOR_BUG_9701
changeset 9: a63d609f5ebe
permissions: -rw-r--r--

Back out 97036ab72558 which inappropriately compared turds to third parties.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* vim: set ts=8 sts=4 et sw=4 tw=99: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /* nsIVariant implementation for xpconnect. */
 #include "xpcprivate.h"
 #include "nsCxPusher.h"
 #include "jsfriendapi.h"
 #include "jsprf.h"
 #include "jswrapper.h"
 using namespace JS;
 using namespace mozilla;
 NS_IMPL_CLASSINFO(XPCVariant, nullptr, 0, XPCVARIANT_CID)
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(XPCVariant)
   NS_INTERFACE_MAP_ENTRY(XPCVariant)
   NS_INTERFACE_MAP_ENTRY(nsIVariant)
   NS_INTERFACE_MAP_ENTRY(nsISupports)
   NS_IMPL_QUERY_CLASSINFO(XPCVariant)
 NS_INTERFACE_MAP_END
 NS_IMPL_CI_INTERFACE_GETTER(XPCVariant, XPCVariant, nsIVariant)
 NS_IMPL_CYCLE_COLLECTING_ADDREF(XPCVariant)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(XPCVariant)
 XPCVariant::XPCVariant(JSContext* cx, jsval aJSVal)
     : mJSVal(aJSVal), mCCGeneration(0)
 {
     nsVariant::Initialize(&mData);
     if (!mJSVal.isPrimitive()) {
         // XXXbholley - The innerization here was from bug 638026. Blake says
         // the basic problem was that we were storing the C++ inner but the JS
         // outer, which meant that, after navigation, the JS inner could be
         // collected, which would cause us to try to recreate the JS inner at
         // some later point after teardown, which would crash. This is shouldn't
         // be a problem anymore because SetParentToWindow will do the right
         // thing, but I'm saving the cleanup here for another day. Blake thinks
         // that we should just not store the WN if we're creating a variant for
         // an outer window.
         JS::RootedObject obj(cx, &mJSVal.toObject());
         obj = JS_ObjectToInnerObject(cx, obj);
         mJSVal = JS::ObjectValue(*obj);
         JSObject *unwrapped = js::CheckedUnwrap(obj, /* stopAtOuter = */ false);
         mReturnRawObject = !(unwrapped && IS_WN_REFLECTOR(unwrapped));
     } else
         mReturnRawObject = false;
 }
 XPCTraceableVariant::~XPCTraceableVariant()
 {
     jsval val = GetJSValPreserveColor();
     MOZ_ASSERT(JSVAL_IS_GCTHING(val), "Must be traceable or unlinked");
     // If val is JSVAL_STRING, we don't need to clean anything up; simply
     // removing the string from the root set is good.
     if (!JSVAL_IS_STRING(val))
         nsVariant::Cleanup(&mData);
     if (!JSVAL_IS_NULL(val))
         RemoveFromRootSet();
 }
 void XPCTraceableVariant::TraceJS(JSTracer* trc)
 {
     MOZ_ASSERT(mJSVal.isMarkable());
     trc->setTracingDetails(GetTraceName, this, 0);
     JS_CallHeapValueTracer(trc, &mJSVal, "XPCTraceableVariant::mJSVal");
 }
 // static
 void
 XPCTraceableVariant::GetTraceName(JSTracer* trc, char *buf, size_t bufsize)
 {
     JS_snprintf(buf, bufsize, "XPCVariant[0x%p].mJSVal", trc->debugPrintArg());
 }
 NS_IMPL_CYCLE_COLLECTION_CLASS(XPCVariant)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(XPCVariant)
     JS::Value val = tmp->GetJSValPreserveColor();
     if (val.isObjectOrNull()) {
         NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mJSVal");
         cb.NoteJSChild(JSVAL_TO_OBJECT(val));
     }
     nsVariant::Traverse(tmp->mData, cb);
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(XPCVariant)
     JS::Value val = tmp->GetJSValPreserveColor();
     // We're sharing val's buffer, clear the pointer to it so Cleanup() won't
     // try to delete it
     if (val.isString())
         tmp->mData.u.wstr.mWStringValue = nullptr;
     nsVariant::Cleanup(&tmp->mData);
     if (val.isMarkable()) {
         XPCTraceableVariant *v = static_cast<XPCTraceableVariant*>(tmp);
         v->RemoveFromRootSet();
     }
     tmp->mJSVal = JS::NullValue();
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 // static
 already_AddRefed<XPCVariant>
 XPCVariant::newVariant(JSContext* cx, jsval aJSVal)
 {
     nsRefPtr<XPCVariant> variant;
     if (!aJSVal.isMarkable())
         variant = new XPCVariant(cx, aJSVal);
     else
         variant = new XPCTraceableVariant(cx, aJSVal);
     if (!variant->InitializeData(cx))
         return nullptr;
     return variant.forget();
 }
 // Helper class to give us a namespace for the table based code below.
 class XPCArrayHomogenizer
 {
 private:
     enum Type
     {
         tNull  = 0 ,  // null value
         tInt       ,  // Integer
         tDbl       ,  // Double
         tBool      ,  // Boolean
         tStr       ,  // String
         tID        ,  // ID
         tArr       ,  // Array
         tISup      ,  // nsISupports (really just a plain JSObject)
         tUnk       ,  // Unknown. Used only for initial state.
         tTypeCount ,  // Just a count for table dimensioning.
         tVar       ,  // nsVariant - last ditch if no other common type found.
         tErr          // No valid state or type has this value.
     };
     // Table has tUnk as a state (column) but not as a type (row).
     static const Type StateTable[tTypeCount][tTypeCount-1];
 public:
     static bool GetTypeForArray(JSContext* cx, HandleObject array,
                                 uint32_t length,
                                 nsXPTType* resultType, nsID* resultID);
 };
 // Current state is the column down the side.
 // Current type is the row along the top.
 // New state is in the box at the intersection.
 const XPCArrayHomogenizer::Type
 XPCArrayHomogenizer::StateTable[tTypeCount][tTypeCount-1] = {
 /*          tNull,tInt ,tDbl ,tBool,tStr ,tID  ,tArr ,tISup */
 /* tNull */{tNull,tVar ,tVar ,tVar ,tStr ,tID  ,tVar ,tISup },
 /* tInt  */{tVar ,tInt ,tDbl ,tVar ,tVar ,tVar ,tVar ,tVar  },
 /* tDbl  */{tVar ,tDbl ,tDbl ,tVar ,tVar ,tVar ,tVar ,tVar  },
 /* tBool */{tVar ,tVar ,tVar ,tBool,tVar ,tVar ,tVar ,tVar  },
 /* tStr  */{tStr ,tVar ,tVar ,tVar ,tStr ,tVar ,tVar ,tVar  },
 /* tID   */{tID  ,tVar ,tVar ,tVar ,tVar ,tID  ,tVar ,tVar  },
 /* tArr  */{tErr ,tErr ,tErr ,tErr ,tErr ,tErr ,tErr ,tErr  },
 /* tISup */{tISup,tVar ,tVar ,tVar ,tVar ,tVar ,tVar ,tISup },
 /* tUnk  */{tNull,tInt ,tDbl ,tBool,tStr ,tID  ,tVar ,tISup }};
 // static
 bool
 XPCArrayHomogenizer::GetTypeForArray(JSContext* cx, HandleObject array,
                                      uint32_t length,
                                      nsXPTType* resultType, nsID* resultID)
 {
     Type state = tUnk;
     Type type;
     RootedValue val(cx);
     RootedObject jsobj(cx);
     for (uint32_t i = 0; i < length; i++) {
         if (!JS_GetElement(cx, array, i, &val))
             return false;
         if (val.isInt32()) {
             type = tInt;
         } else if (val.isDouble()) {
             type = tDbl;
         } else if (val.isBoolean()) {
             type = tBool;
         } else if (val.isUndefined()) {
             state = tVar;
             break;
         } else if (val.isNull()) {
             type = tNull;
         } else if (val.isString()) {
             type = tStr;
         } else {
             MOZ_ASSERT(val.isObject(), "invalid type of jsval!");
             jsobj = &val.toObject();
             if (JS_IsArrayObject(cx, jsobj))
                 type = tArr;
             else if (xpc_JSObjectIsID(cx, jsobj))
                 type = tID;
             else
                 type = tISup;
         }
         MOZ_ASSERT(state != tErr, "bad state table!");
         MOZ_ASSERT(type  != tErr, "bad type!");
         MOZ_ASSERT(type  != tVar, "bad type!");
         MOZ_ASSERT(type  != tUnk, "bad type!");
         state = StateTable[state][type];
         MOZ_ASSERT(state != tErr, "bad state table!");
         MOZ_ASSERT(state != tUnk, "bad state table!");
         if (state == tVar)
             break;
     }
     switch (state) {
         case tInt :
             *resultType = nsXPTType((uint8_t)TD_INT32);
             break;
         case tDbl :
             *resultType = nsXPTType((uint8_t)TD_DOUBLE);
             break;
         case tBool:
             *resultType = nsXPTType((uint8_t)TD_BOOL);
             break;
         case tStr :
             *resultType = nsXPTType((uint8_t)TD_PWSTRING);
             break;
         case tID  :
             *resultType = nsXPTType((uint8_t)TD_PNSIID);
             break;
         case tISup:
             *resultType = nsXPTType((uint8_t)TD_INTERFACE_IS_TYPE);
             *resultID = NS_GET_IID(nsISupports);
             break;
         case tNull:
             // FALL THROUGH
         case tVar :
             *resultType = nsXPTType((uint8_t)TD_INTERFACE_IS_TYPE);
             *resultID = NS_GET_IID(nsIVariant);
             break;
         case tArr :
             // FALL THROUGH
         case tUnk :
             // FALL THROUGH
         case tErr :
             // FALL THROUGH
         default:
             NS_ERROR("bad state");
             return false;
     }
     return true;
 }
 bool XPCVariant::InitializeData(JSContext* cx)
 {
     JS_CHECK_RECURSION(cx, return false);
     RootedValue val(cx, GetJSVal());
     if (val.isInt32())
         return NS_SUCCEEDED(nsVariant::SetFromInt32(&mData, val.toInt32()));
     if (val.isDouble())
         return NS_SUCCEEDED(nsVariant::SetFromDouble(&mData, val.toDouble()));
     if (val.isBoolean())
         return NS_SUCCEEDED(nsVariant::SetFromBool(&mData, val.toBoolean()));
     if (val.isUndefined())
         return NS_SUCCEEDED(nsVariant::SetToVoid(&mData));
     if (val.isNull())
         return NS_SUCCEEDED(nsVariant::SetToEmpty(&mData));
     if (val.isString()) {
         JSString* str = val.toString();
         if (!str)
             return false;
         // Don't use nsVariant::SetFromWStringWithSize, because that will copy
         // the data.  Just handle this ourselves.  Note that it's ok to not
         // copy because we added mJSVal as a GC root.
         MOZ_ASSERT(mData.mType == nsIDataType::VTYPE_EMPTY,
                    "Why do we already have data?");
         // Despite the fact that the variant holds the length, there are
         // implicit assumptions that mWStringValue[mWStringLength] == 0
         size_t length;
         const jschar *chars = JS_GetStringCharsZAndLength(cx, str, &length);
         if (!chars)
             return false;
         mData.u.wstr.mWStringValue = const_cast<jschar *>(chars);
         // Use C-style cast, because reinterpret cast from size_t to
         // uint32_t is not valid on some platforms.
         mData.u.wstr.mWStringLength = (uint32_t)length;
         mData.mType = nsIDataType::VTYPE_WSTRING_SIZE_IS;
         return true;
     }
     // leaving only JSObject...
     MOZ_ASSERT(val.isObject(), "invalid type of jsval!");
     RootedObject jsobj(cx, &val.toObject());
     // Let's see if it is a xpcJSID.
     const nsID* id = xpc_JSObjectToID(cx, jsobj);
     if (id)
         return NS_SUCCEEDED(nsVariant::SetFromID(&mData, *id));
     // Let's see if it is a js array object.
     uint32_t len;
     if (JS_IsArrayObject(cx, jsobj) && JS_GetArrayLength(cx, jsobj, &len)) {
         if (!len) {
             // Zero length array
             nsVariant::SetToEmptyArray(&mData);
             return true;
         }
         nsXPTType type;
         nsID id;
         if (!XPCArrayHomogenizer::GetTypeForArray(cx, jsobj, len, &type, &id))
             return false;
         if (!XPCConvert::JSArray2Native(&mData.u.array.mArrayValue,
                                         val, len, type, &id, nullptr))
             return false;
         mData.mType = nsIDataType::VTYPE_ARRAY;
         if (type.IsInterfacePointer())
             mData.u.array.mArrayInterfaceID = id;
         mData.u.array.mArrayCount = len;
         mData.u.array.mArrayType = type.TagPart();
         return true;
     }
     // XXX This could be smarter and pick some more interesting iface.
     nsXPConnect*  xpc = nsXPConnect::XPConnect();
     nsCOMPtr<nsISupports> wrapper;
     const nsIID& iid = NS_GET_IID(nsISupports);
     return NS_SUCCEEDED(xpc->WrapJS(cx, jsobj,
                                     iid, getter_AddRefs(wrapper))) &&
            NS_SUCCEEDED(nsVariant::SetFromInterface(&mData, iid, wrapper));
 }
 NS_IMETHODIMP
 XPCVariant::GetAsJSVal(MutableHandleValue result)
 {
   result.set(GetJSVal());
   return NS_OK;
 }
 // static
 bool
 XPCVariant::VariantDataToJS(nsIVariant* variant,
                             nsresult* pErr, MutableHandleValue pJSVal)
 {
     // Get the type early because we might need to spoof it below.
     uint16_t type;
     if (NS_FAILED(variant->GetDataType(&type)))
         return false;
     AutoJSContext cx;
     RootedValue realVal(cx);
     nsresult rv = variant->GetAsJSVal(&realVal);
     if (NS_SUCCEEDED(rv) &&
         (JSVAL_IS_PRIMITIVE(realVal) ||
          type == nsIDataType::VTYPE_ARRAY ||
          type == nsIDataType::VTYPE_EMPTY_ARRAY ||
          type == nsIDataType::VTYPE_ID)) {
         if (!JS_WrapValue(cx, &realVal))
             return false;
         pJSVal.set(realVal);
         return true;
     }
     nsCOMPtr<XPCVariant> xpcvariant = do_QueryInterface(variant);
     if (xpcvariant && xpcvariant->mReturnRawObject) {
         MOZ_ASSERT(type == nsIDataType::VTYPE_INTERFACE ||
                    type == nsIDataType::VTYPE_INTERFACE_IS,
                    "Weird variant");
         if (!JS_WrapValue(cx, &realVal))
             return false;
         pJSVal.set(realVal);
         return true;
     }
     // else, it's an object and we really need to double wrap it if we've
     // already decided that its 'natural' type is as some sort of interface.
     // We just fall through to the code below and let it do what it does.
     // The nsIVariant is not a XPCVariant (or we act like it isn't).
     // So we extract the data and do the Right Thing.
     // We ASSUME that the variant implementation can do these conversions...
     nsID iid;
     switch (type) {
         case nsIDataType::VTYPE_INT8:
         case nsIDataType::VTYPE_INT16:
         case nsIDataType::VTYPE_INT32:
         case nsIDataType::VTYPE_INT64:
         case nsIDataType::VTYPE_UINT8:
         case nsIDataType::VTYPE_UINT16:
         case nsIDataType::VTYPE_UINT32:
         case nsIDataType::VTYPE_UINT64:
         case nsIDataType::VTYPE_FLOAT:
         case nsIDataType::VTYPE_DOUBLE:
         {
             double d;
             if (NS_FAILED(variant->GetAsDouble(&d)))
                 return false;
             pJSVal.setNumber(d);
             return true;
         }
         case nsIDataType::VTYPE_BOOL:
         {
             bool b;
             if (NS_FAILED(variant->GetAsBool(&b)))
                 return false;
             pJSVal.setBoolean(b);
             return true;
         }
         case nsIDataType::VTYPE_CHAR:
         {
             char c;
             if (NS_FAILED(variant->GetAsChar(&c)))
                 return false;
             return XPCConvert::NativeData2JS(pJSVal, (const void*)&c, TD_CHAR, &iid, pErr);
         }
         case nsIDataType::VTYPE_WCHAR:
         {
             char16_t wc;
             if (NS_FAILED(variant->GetAsWChar(&wc)))
                 return false;
             return XPCConvert::NativeData2JS(pJSVal, (const void*)&wc, TD_WCHAR, &iid, pErr);
         }
         case nsIDataType::VTYPE_ID:
         {
             if (NS_FAILED(variant->GetAsID(&iid)))
                 return false;
             nsID *v = &iid;
             return XPCConvert::NativeData2JS(pJSVal, (const void*)&v, TD_PNSIID, &iid, pErr);
         }
         case nsIDataType::VTYPE_ASTRING:
         {
             nsAutoString astring;
             if (NS_FAILED(variant->GetAsAString(astring)))
                 return false;
             nsAutoString *v = &astring;
             return XPCConvert::NativeData2JS(pJSVal, (const void*)&v, TD_ASTRING, &iid, pErr);
         }
         case nsIDataType::VTYPE_DOMSTRING:
         {
             nsAutoString astring;
             if (NS_FAILED(variant->GetAsAString(astring)))
                 return false;
             nsAutoString *v = &astring;
             return XPCConvert::NativeData2JS(pJSVal, (const void*)&v,
                                              TD_DOMSTRING, &iid, pErr);
         }
         case nsIDataType::VTYPE_CSTRING:
         {
             nsAutoCString cString;
             if (NS_FAILED(variant->GetAsACString(cString)))
                 return false;
             nsAutoCString *v = &cString;
             return XPCConvert::NativeData2JS(pJSVal, (const void*)&v,
                                              TD_CSTRING, &iid, pErr);
         }
         case nsIDataType::VTYPE_UTF8STRING:
         {
             nsUTF8String utf8String;
             if (NS_FAILED(variant->GetAsAUTF8String(utf8String)))
                 return false;
             nsUTF8String *v = &utf8String;
             return XPCConvert::NativeData2JS(pJSVal, (const void*)&v,
                                              TD_UTF8STRING, &iid, pErr);
         }
         case nsIDataType::VTYPE_CHAR_STR:
         {
             char *pc;
             if (NS_FAILED(variant->GetAsString(&pc)))
                 return false;
             bool success = XPCConvert::NativeData2JS(pJSVal, (const void*)&pc,
                                                      TD_PSTRING, &iid, pErr);
             nsMemory::Free(pc);
             return success;
         }
         case nsIDataType::VTYPE_STRING_SIZE_IS:
         {
             char *pc;
             uint32_t size;
             if (NS_FAILED(variant->GetAsStringWithSize(&size, &pc)))
                 return false;
             bool success = XPCConvert::NativeStringWithSize2JS(pJSVal, (const void*)&pc,
                                                                TD_PSTRING_SIZE_IS, size, pErr);
             nsMemory::Free(pc);
             return success;
         }
         case nsIDataType::VTYPE_WCHAR_STR:
         {
             char16_t *pwc;
             if (NS_FAILED(variant->GetAsWString(&pwc)))
                 return false;
             bool success = XPCConvert::NativeData2JS(pJSVal, (const void*)&pwc,
                                                      TD_PSTRING, &iid, pErr);
             nsMemory::Free(pwc);
             return success;
         }
         case nsIDataType::VTYPE_WSTRING_SIZE_IS:
         {
             char16_t *pwc;
             uint32_t size;
             if (NS_FAILED(variant->GetAsWStringWithSize(&size, &pwc)))
                 return false;
             bool success = XPCConvert::NativeStringWithSize2JS(pJSVal, (const void*)&pwc,
                                                                TD_PWSTRING_SIZE_IS, size, pErr);
             nsMemory::Free(pwc);
             return success;
         }
         case nsIDataType::VTYPE_INTERFACE:
         case nsIDataType::VTYPE_INTERFACE_IS:
         {
             nsISupports *pi;
             nsID* piid;
             if (NS_FAILED(variant->GetAsInterface(&piid, (void **)&pi)))
                 return false;
             iid = *piid;
             nsMemory::Free((char*)piid);
             bool success = XPCConvert::NativeData2JS(pJSVal, (const void*)&pi,
                                                      TD_INTERFACE_IS_TYPE, &iid, pErr);
             if (pi)
                 pi->Release();
             return success;
         }
         case nsIDataType::VTYPE_ARRAY:
         {
             nsDiscriminatedUnion du;
             nsVariant::Initialize(&du);
             nsresult rv;
             rv = variant->GetAsArray(&du.u.array.mArrayType,
                                      &du.u.array.mArrayInterfaceID,
                                      &du.u.array.mArrayCount,
                                      &du.u.array.mArrayValue);
             if (NS_FAILED(rv))
                 return false;
             // must exit via VARIANT_DONE from here on...
             du.mType = nsIDataType::VTYPE_ARRAY;
             bool success = false;
             nsXPTType conversionType;
             uint16_t elementType = du.u.array.mArrayType;
             const nsID* pid = nullptr;
             switch (elementType) {
                 case nsIDataType::VTYPE_INT8:
                 case nsIDataType::VTYPE_INT16:
                 case nsIDataType::VTYPE_INT32:
                 case nsIDataType::VTYPE_INT64:
                 case nsIDataType::VTYPE_UINT8:
                 case nsIDataType::VTYPE_UINT16:
                 case nsIDataType::VTYPE_UINT32:
                 case nsIDataType::VTYPE_UINT64:
                 case nsIDataType::VTYPE_FLOAT:
                 case nsIDataType::VTYPE_DOUBLE:
                 case nsIDataType::VTYPE_BOOL:
                 case nsIDataType::VTYPE_CHAR:
                 case nsIDataType::VTYPE_WCHAR:
                     conversionType = nsXPTType((uint8_t)elementType);
                     break;
                 case nsIDataType::VTYPE_ID:
                 case nsIDataType::VTYPE_CHAR_STR:
                 case nsIDataType::VTYPE_WCHAR_STR:
                     conversionType = nsXPTType((uint8_t)elementType);
                     break;
                 case nsIDataType::VTYPE_INTERFACE:
                     pid = &NS_GET_IID(nsISupports);
                     conversionType = nsXPTType((uint8_t)elementType);
                     break;
                 case nsIDataType::VTYPE_INTERFACE_IS:
                     pid = &du.u.array.mArrayInterfaceID;
                     conversionType = nsXPTType((uint8_t)elementType);
                     break;
                 // The rest are illegal.
                 case nsIDataType::VTYPE_VOID:
                 case nsIDataType::VTYPE_ASTRING:
                 case nsIDataType::VTYPE_DOMSTRING:
                 case nsIDataType::VTYPE_CSTRING:
                 case nsIDataType::VTYPE_UTF8STRING:
                 case nsIDataType::VTYPE_WSTRING_SIZE_IS:
                 case nsIDataType::VTYPE_STRING_SIZE_IS:
                 case nsIDataType::VTYPE_ARRAY:
                 case nsIDataType::VTYPE_EMPTY_ARRAY:
                 case nsIDataType::VTYPE_EMPTY:
                 default:
                     NS_ERROR("bad type in array!");
                     goto VARIANT_DONE;
             }
             success =
                 XPCConvert::NativeArray2JS(pJSVal,
                                            (const void**)&du.u.array.mArrayValue,
                                            conversionType, pid,
                                            du.u.array.mArrayCount, pErr);
 VARIANT_DONE:
             nsVariant::Cleanup(&du);
             return success;
         }
         case nsIDataType::VTYPE_EMPTY_ARRAY:
         {
             JSObject* array = JS_NewArrayObject(cx, 0);
             if (!array)
                 return false;
             pJSVal.setObject(*array);
             return true;
         }
         case nsIDataType::VTYPE_VOID:
             pJSVal.setUndefined();
             return true;
         case nsIDataType::VTYPE_EMPTY:
             pJSVal.setNull();
             return true;
         default:
             NS_ERROR("bad type in variant!");
             return false;
     }
 }
 /***************************************************************************/
 /***************************************************************************/
 // XXX These default implementations need to be improved to allow for
 // some more interesting conversions.
 /* readonly attribute uint16_t dataType; */
 NS_IMETHODIMP XPCVariant::GetDataType(uint16_t *aDataType)
 {
     *aDataType = mData.mType;
     return NS_OK;
 }
 /* uint8_t getAsInt8 (); */
 NS_IMETHODIMP XPCVariant::GetAsInt8(uint8_t *_retval)
 {
     return nsVariant::ConvertToInt8(mData, _retval);
 }
 /* int16_t getAsInt16 (); */
 NS_IMETHODIMP XPCVariant::GetAsInt16(int16_t *_retval)
 {
     return nsVariant::ConvertToInt16(mData, _retval);
 }
 /* int32_t getAsInt32 (); */
 NS_IMETHODIMP XPCVariant::GetAsInt32(int32_t *_retval)
 {
     return nsVariant::ConvertToInt32(mData, _retval);
 }
 /* int64_t getAsInt64 (); */
 NS_IMETHODIMP XPCVariant::GetAsInt64(int64_t *_retval)
 {
     return nsVariant::ConvertToInt64(mData, _retval);
 }
 /* uint8_t getAsUint8 (); */
 NS_IMETHODIMP XPCVariant::GetAsUint8(uint8_t *_retval)
 {
     return nsVariant::ConvertToUint8(mData, _retval);
 }
 /* uint16_t getAsUint16 (); */
 NS_IMETHODIMP XPCVariant::GetAsUint16(uint16_t *_retval)
 {
     return nsVariant::ConvertToUint16(mData, _retval);
 }
 /* uint32_t getAsUint32 (); */
 NS_IMETHODIMP XPCVariant::GetAsUint32(uint32_t *_retval)
 {
     return nsVariant::ConvertToUint32(mData, _retval);
 }
 /* uint64_t getAsUint64 (); */
 NS_IMETHODIMP XPCVariant::GetAsUint64(uint64_t *_retval)
 {
     return nsVariant::ConvertToUint64(mData, _retval);
 }
 /* float getAsFloat (); */
 NS_IMETHODIMP XPCVariant::GetAsFloat(float *_retval)
 {
     return nsVariant::ConvertToFloat(mData, _retval);
 }
 /* double getAsDouble (); */
 NS_IMETHODIMP XPCVariant::GetAsDouble(double *_retval)
 {
     return nsVariant::ConvertToDouble(mData, _retval);
 }
 /* bool getAsBool (); */
 NS_IMETHODIMP XPCVariant::GetAsBool(bool *_retval)
 {
     return nsVariant::ConvertToBool(mData, _retval);
 }
 /* char getAsChar (); */
 NS_IMETHODIMP XPCVariant::GetAsChar(char *_retval)
 {
     return nsVariant::ConvertToChar(mData, _retval);
 }
 /* wchar getAsWChar (); */
 NS_IMETHODIMP XPCVariant::GetAsWChar(char16_t *_retval)
 {
     return nsVariant::ConvertToWChar(mData, _retval);
 }
 /* [notxpcom] nsresult getAsID (out nsID retval); */
 NS_IMETHODIMP_(nsresult) XPCVariant::GetAsID(nsID *retval)
 {
     return nsVariant::ConvertToID(mData, retval);
 }
 /* AString getAsAString (); */
 NS_IMETHODIMP XPCVariant::GetAsAString(nsAString & _retval)
 {
     return nsVariant::ConvertToAString(mData, _retval);
 }
 /* DOMString getAsDOMString (); */
 NS_IMETHODIMP XPCVariant::GetAsDOMString(nsAString & _retval)
 {
     // A DOMString maps to an AString internally, so we can re-use
     // ConvertToAString here.
     return nsVariant::ConvertToAString(mData, _retval);
 }
 /* ACString getAsACString (); */
 NS_IMETHODIMP XPCVariant::GetAsACString(nsACString & _retval)
 {
     return nsVariant::ConvertToACString(mData, _retval);
 }
 /* AUTF8String getAsAUTF8String (); */
 NS_IMETHODIMP XPCVariant::GetAsAUTF8String(nsAUTF8String & _retval)
 {
     return nsVariant::ConvertToAUTF8String(mData, _retval);
 }
 /* string getAsString (); */
 NS_IMETHODIMP XPCVariant::GetAsString(char **_retval)
 {
     return nsVariant::ConvertToString(mData, _retval);
 }
 /* wstring getAsWString (); */
 NS_IMETHODIMP XPCVariant::GetAsWString(char16_t **_retval)
 {
     return nsVariant::ConvertToWString(mData, _retval);
 }
 /* nsISupports getAsISupports (); */
 NS_IMETHODIMP XPCVariant::GetAsISupports(nsISupports **_retval)
 {
     return nsVariant::ConvertToISupports(mData, _retval);
 }
 /* void getAsInterface (out nsIIDPtr iid, [iid_is (iid), retval] out nsQIResult iface); */
 NS_IMETHODIMP XPCVariant::GetAsInterface(nsIID * *iid, void * *iface)
 {
     return nsVariant::ConvertToInterface(mData, iid, iface);
 }
 /* [notxpcom] nsresult getAsArray (out uint16_t type, out nsIID iid, out uint32_t count, out voidPtr ptr); */
 NS_IMETHODIMP_(nsresult) XPCVariant::GetAsArray(uint16_t *type, nsIID *iid, uint32_t *count, void * *ptr)
 {
     return nsVariant::ConvertToArray(mData, type, iid, count, ptr);
 }
 /* void getAsStringWithSize (out uint32_t size, [size_is (size), retval] out string str); */
 NS_IMETHODIMP XPCVariant::GetAsStringWithSize(uint32_t *size, char **str)
 {
     return nsVariant::ConvertToStringWithSize(mData, size, str);
 }
 /* void getAsWStringWithSize (out uint32_t size, [size_is (size), retval] out wstring str); */
 NS_IMETHODIMP XPCVariant::GetAsWStringWithSize(uint32_t *size, char16_t **str)
 {
     return nsVariant::ConvertToWStringWithSize(mData, size, str);
 }

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js/xpconnect/src/XPCVariant.cpp@a63d609f5ebe (annotated)

js/xpconnect/src/XPCVariant.cpp