xpcom/ds/nsVariant.cpp
author L10n Bumper Bot <release+l10nbumper@mozilla.com>
Thu, 08 Nov 2018 03:00:11 -0800
changeset 501100 1cd4f2d571554c4dc89cf1be1d98683c0d14f797
parent 497580 079e9287971001d839030ce8e60bb175018da76c
child 506372 6b60870ec6f8473b578be250179840c5316f0444
permissions -rw-r--r--
no bug - Bumping Fennec l10n changesets r=release a=l10n-bump DONTBUILD an -> 336e061995b9 ar -> f6834a7d7374 as -> d2c76e616a66 ast -> fcb8f3455237 az -> c4caf3b07cf2 be -> 697eb1022498 bg -> 7bf1f448f743 bn-BD -> 5f7a87adee06 bn-IN -> 49ce3195c4c2 br -> 41cf35b7c5b5 bs -> 4a14aee27904 ca -> 9373e8ce86d4 cak -> a40d767541ba cs -> 4b99defb0525 cy -> 4c948fed2584 de -> 017a7e7a267a dsb -> aadebeccf5ba el -> 2d28a78dcef5 en-CA -> 55ad9171a9f0 en-GB -> 296422b495e9 en-ZA -> c1b5d2128914 eo -> c68e87667d9f es-AR -> bff0a788c711 es-CL -> 1d3efd2532ea es-ES -> 4d1feb70b0e2 es-MX -> fceda607d0f4 et -> 58a8262a0cc7 eu -> 7cebfd46208b fa -> cbc040d58476 ff -> 46f5aec275ea fi -> 235ab13d261e fr -> 8ee417b64f99

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#include "nsVariant.h"
#include "prprf.h"
#include "prdtoa.h"
#include <math.h>
#include "nsCycleCollectionParticipant.h"
#include "xptinfo.h"
#include "nsReadableUtils.h"
#include "nsMemory.h"
#include "nsString.h"
#include "nsCRTGlue.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/Printf.h"

/***************************************************************************/
// Helpers for static convert functions...

static nsresult
String2Double(const char* aString, double* aResult)
{
  char* next;
  double value = PR_strtod(aString, &next);
  if (next == aString) {
    return NS_ERROR_CANNOT_CONVERT_DATA;
  }
  *aResult = value;
  return NS_OK;
}

static nsresult
AString2Double(const nsAString& aString, double* aResult)
{
  char* pChars = ToNewCString(aString);
  if (!pChars) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  nsresult rv = String2Double(pChars, aResult);
  free(pChars);
  return rv;
}

static nsresult
AUTF8String2Double(const nsAUTF8String& aString, double* aResult)
{
  return String2Double(PromiseFlatUTF8String(aString).get(), aResult);
}

static nsresult
ACString2Double(const nsACString& aString, double* aResult)
{
  return String2Double(PromiseFlatCString(aString).get(), aResult);
}

// Fills aOutData with double, uint32_t, or int32_t.
// Returns NS_OK, an error code, or a non-NS_OK success code
nsresult
nsDiscriminatedUnion::ToManageableNumber(nsDiscriminatedUnion* aOutData) const
{
  nsresult rv;

  switch (mType) {
    // This group results in a int32_t...

#define CASE__NUMBER_INT32(type_, member_)                                    \
    case nsIDataType::type_ :                                                 \
        aOutData->u.mInt32Value = u.member_ ;                                 \
        aOutData->mType = nsIDataType::VTYPE_INT32;                           \
        return NS_OK;

    CASE__NUMBER_INT32(VTYPE_INT8,   mInt8Value)
    CASE__NUMBER_INT32(VTYPE_INT16,  mInt16Value)
    CASE__NUMBER_INT32(VTYPE_INT32,  mInt32Value)
    CASE__NUMBER_INT32(VTYPE_UINT8,  mUint8Value)
    CASE__NUMBER_INT32(VTYPE_UINT16, mUint16Value)
    CASE__NUMBER_INT32(VTYPE_BOOL,   mBoolValue)
    CASE__NUMBER_INT32(VTYPE_CHAR,   mCharValue)
    CASE__NUMBER_INT32(VTYPE_WCHAR,  mWCharValue)

#undef CASE__NUMBER_INT32

    // This group results in a uint32_t...

    case nsIDataType::VTYPE_UINT32:
      aOutData->u.mInt32Value = u.mUint32Value;
      aOutData->mType = nsIDataType::VTYPE_INT32;
      return NS_OK;

    // This group results in a double...

    case nsIDataType::VTYPE_INT64:
    case nsIDataType::VTYPE_UINT64:
      // XXX Need boundary checking here.
      // We may need to return NS_SUCCESS_LOSS_OF_INSIGNIFICANT_DATA
      aOutData->u.mDoubleValue = double(u.mInt64Value);
      aOutData->mType = nsIDataType::VTYPE_DOUBLE;
      return NS_OK;
    case nsIDataType::VTYPE_FLOAT:
      aOutData->u.mDoubleValue = u.mFloatValue;
      aOutData->mType = nsIDataType::VTYPE_DOUBLE;
      return NS_OK;
    case nsIDataType::VTYPE_DOUBLE:
      aOutData->u.mDoubleValue = u.mDoubleValue;
      aOutData->mType = nsIDataType::VTYPE_DOUBLE;
      return NS_OK;
    case nsIDataType::VTYPE_CHAR_STR:
    case nsIDataType::VTYPE_STRING_SIZE_IS:
      rv = String2Double(u.str.mStringValue, &aOutData->u.mDoubleValue);
      if (NS_FAILED(rv)) {
        return rv;
      }
      aOutData->mType = nsIDataType::VTYPE_DOUBLE;
      return NS_OK;
    case nsIDataType::VTYPE_ASTRING:
      rv = AString2Double(*u.mAStringValue, &aOutData->u.mDoubleValue);
      if (NS_FAILED(rv)) {
        return rv;
      }
      aOutData->mType = nsIDataType::VTYPE_DOUBLE;
      return NS_OK;
    case nsIDataType::VTYPE_UTF8STRING:
      rv = AUTF8String2Double(*u.mUTF8StringValue,
                              &aOutData->u.mDoubleValue);
      if (NS_FAILED(rv)) {
        return rv;
      }
      aOutData->mType = nsIDataType::VTYPE_DOUBLE;
      return NS_OK;
    case nsIDataType::VTYPE_CSTRING:
      rv = ACString2Double(*u.mCStringValue,
                           &aOutData->u.mDoubleValue);
      if (NS_FAILED(rv)) {
        return rv;
      }
      aOutData->mType = nsIDataType::VTYPE_DOUBLE;
      return NS_OK;
    case nsIDataType::VTYPE_WCHAR_STR:
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
      rv = AString2Double(nsDependentString(u.wstr.mWStringValue),
                          &aOutData->u.mDoubleValue);
      if (NS_FAILED(rv)) {
        return rv;
      }
      aOutData->mType = nsIDataType::VTYPE_DOUBLE;
      return NS_OK;

    // This group fails...

    case nsIDataType::VTYPE_VOID:
    case nsIDataType::VTYPE_ID:
    case nsIDataType::VTYPE_INTERFACE:
    case nsIDataType::VTYPE_INTERFACE_IS:
    case nsIDataType::VTYPE_ARRAY:
    case nsIDataType::VTYPE_EMPTY_ARRAY:
    case nsIDataType::VTYPE_EMPTY:
    default:
      return NS_ERROR_CANNOT_CONVERT_DATA;
  }
}

/***************************************************************************/
// Array helpers...

void
nsDiscriminatedUnion::FreeArray()
{
  NS_ASSERTION(mType == nsIDataType::VTYPE_ARRAY, "bad FreeArray call");
  NS_ASSERTION(u.array.mArrayValue, "bad array");
  NS_ASSERTION(u.array.mArrayCount, "bad array count");

#define CASE__FREE_ARRAY_PTR(type_, ctype_)                                   \
        case nsIDataType::type_ :                                             \
        {                                                                     \
            ctype_** p = (ctype_**) u.array.mArrayValue;                      \
            for (uint32_t i = u.array.mArrayCount; i > 0; p++, i--)           \
                if (*p)                                                       \
                    free((char*)*p);                                          \
            break;                                                            \
        }

#define CASE__FREE_ARRAY_IFACE(type_, ctype_)                                 \
        case nsIDataType::type_ :                                             \
        {                                                                     \
            ctype_** p = (ctype_**) u.array.mArrayValue;                      \
            for (uint32_t i = u.array.mArrayCount; i > 0; p++, i--)           \
                if (*p)                                                       \
                    (*p)->Release();                                          \
            break;                                                            \
        }

  switch (u.array.mArrayType) {
    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:
      break;

    // XXX We ASSUME that "array of nsID" means "array of pointers to nsID".
    CASE__FREE_ARRAY_PTR(VTYPE_ID, nsID)
    CASE__FREE_ARRAY_PTR(VTYPE_CHAR_STR, char)
    CASE__FREE_ARRAY_PTR(VTYPE_WCHAR_STR, char16_t)
    CASE__FREE_ARRAY_IFACE(VTYPE_INTERFACE, nsISupports)
    CASE__FREE_ARRAY_IFACE(VTYPE_INTERFACE_IS, nsISupports)

    // The rest are illegal.
    case nsIDataType::VTYPE_VOID:
    case nsIDataType::VTYPE_ASTRING:
    case nsIDataType::VTYPE_UTF8STRING:
    case nsIDataType::VTYPE_CSTRING:
    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!");
      break;
  }

  // Free the array memory.
  free((char*)u.array.mArrayValue);

#undef CASE__FREE_ARRAY_PTR
#undef CASE__FREE_ARRAY_IFACE
}

static nsresult
CloneArray(uint16_t aInType, const nsIID* aInIID,
           uint32_t aInCount, void* aInValue,
           uint16_t* aOutType, nsIID* aOutIID,
           uint32_t* aOutCount, void** aOutValue)
{
  NS_ASSERTION(aInCount, "bad param");
  NS_ASSERTION(aInValue, "bad param");
  NS_ASSERTION(aOutType, "bad param");
  NS_ASSERTION(aOutCount, "bad param");
  NS_ASSERTION(aOutValue, "bad param");

  uint32_t i;

  // First we figure out the size of the elements for the new u.array.

  size_t elementSize;
  size_t allocSize;

  switch (aInType) {
    case nsIDataType::VTYPE_INT8:
      elementSize = sizeof(int8_t);
      break;
    case nsIDataType::VTYPE_INT16:
      elementSize = sizeof(int16_t);
      break;
    case nsIDataType::VTYPE_INT32:
      elementSize = sizeof(int32_t);
      break;
    case nsIDataType::VTYPE_INT64:
      elementSize = sizeof(int64_t);
      break;
    case nsIDataType::VTYPE_UINT8:
      elementSize = sizeof(uint8_t);
      break;
    case nsIDataType::VTYPE_UINT16:
      elementSize = sizeof(uint16_t);
      break;
    case nsIDataType::VTYPE_UINT32:
      elementSize = sizeof(uint32_t);
      break;
    case nsIDataType::VTYPE_UINT64:
      elementSize = sizeof(uint64_t);
      break;
    case nsIDataType::VTYPE_FLOAT:
      elementSize = sizeof(float);
      break;
    case nsIDataType::VTYPE_DOUBLE:
      elementSize = sizeof(double);
      break;
    case nsIDataType::VTYPE_BOOL:
      elementSize = sizeof(bool);
      break;
    case nsIDataType::VTYPE_CHAR:
      elementSize = sizeof(char);
      break;
    case nsIDataType::VTYPE_WCHAR:
      elementSize = sizeof(char16_t);
      break;

    // XXX We ASSUME that "array of nsID" means "array of pointers to nsID".
    case nsIDataType::VTYPE_ID:
    case nsIDataType::VTYPE_CHAR_STR:
    case nsIDataType::VTYPE_WCHAR_STR:
    case nsIDataType::VTYPE_INTERFACE:
    case nsIDataType::VTYPE_INTERFACE_IS:
      elementSize = sizeof(void*);
      break;

    // The rest are illegal.
    case nsIDataType::VTYPE_ASTRING:
    case nsIDataType::VTYPE_UTF8STRING:
    case nsIDataType::VTYPE_CSTRING:
    case nsIDataType::VTYPE_STRING_SIZE_IS:
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
    case nsIDataType::VTYPE_VOID:
    case nsIDataType::VTYPE_ARRAY:
    case nsIDataType::VTYPE_EMPTY_ARRAY:
    case nsIDataType::VTYPE_EMPTY:
    default:
      NS_ERROR("bad type in array!");
      return NS_ERROR_CANNOT_CONVERT_DATA;
  }


  // Alloc the u.array.

  allocSize = aInCount * elementSize;
  *aOutValue = moz_xmalloc(allocSize);

  // Clone the elements.

  switch (aInType) {
    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:
      memcpy(*aOutValue, aInValue, allocSize);
      break;

    case nsIDataType::VTYPE_INTERFACE_IS:
      if (aOutIID) {
        *aOutIID = *aInIID;
      }
      MOZ_FALLTHROUGH;

    case nsIDataType::VTYPE_INTERFACE: {
      memcpy(*aOutValue, aInValue, allocSize);

      nsISupports** p = (nsISupports**)*aOutValue;
      for (i = aInCount; i > 0; ++p, --i)
        if (*p) {
          (*p)->AddRef();
        }
      break;
    }

    // XXX We ASSUME that "array of nsID" means "array of pointers to nsID".
    case nsIDataType::VTYPE_ID: {
      nsID** inp  = (nsID**)aInValue;
      nsID** outp = (nsID**)*aOutValue;
      for (i = aInCount; i > 0; --i) {
        nsID* idp = *(inp++);
        if (idp) {
          *(outp++) = idp->Clone();
        } else {
          *(outp++) = nullptr;
        }
      }
      break;
    }

    case nsIDataType::VTYPE_CHAR_STR: {
      char** inp  = (char**)aInValue;
      char** outp = (char**)*aOutValue;
      for (i = aInCount; i > 0; i--) {
        char* str = *(inp++);
        if (str) {
          *(outp++) = moz_xstrdup(str);
        } else {
          *(outp++) = nullptr;
        }
      }
      break;
    }

    case nsIDataType::VTYPE_WCHAR_STR: {
      char16_t** inp  = (char16_t**)aInValue;
      char16_t** outp = (char16_t**)*aOutValue;
      for (i = aInCount; i > 0; i--) {
        char16_t* str = *(inp++);
        if (str) {
          *(outp++) = NS_xstrdup(str);
        } else {
          *(outp++) = nullptr;
        }
      }
      break;
    }

    // The rest are illegal.
    case nsIDataType::VTYPE_VOID:
    case nsIDataType::VTYPE_ARRAY:
    case nsIDataType::VTYPE_EMPTY_ARRAY:
    case nsIDataType::VTYPE_EMPTY:
    case nsIDataType::VTYPE_ASTRING:
    case nsIDataType::VTYPE_UTF8STRING:
    case nsIDataType::VTYPE_CSTRING:
    case nsIDataType::VTYPE_STRING_SIZE_IS:
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
    default:
      NS_ERROR("bad type in array!");
      return NS_ERROR_CANNOT_CONVERT_DATA;
  }

  *aOutType = aInType;
  *aOutCount = aInCount;
  return NS_OK;
}

/***************************************************************************/

#define TRIVIAL_DATA_CONVERTER(type_, member_, retval_)                       \
    if (mType == nsIDataType::type_) {                                        \
        *retval_ = u.member_;                                                 \
        return NS_OK;                                                         \
    }

#define NUMERIC_CONVERSION_METHOD_BEGIN(type_, Ctype_, name_)                 \
nsresult                                                                      \
nsDiscriminatedUnion::ConvertTo##name_ (Ctype_* aResult) const                \
{                                                                             \
    TRIVIAL_DATA_CONVERTER(type_, m##name_##Value, aResult)                   \
    nsDiscriminatedUnion tempData;                                            \
    nsresult rv = ToManageableNumber(&tempData);                              \
    /*                                                                     */ \
    /* NOTE: rv may indicate a success code that we want to preserve       */ \
    /* For the final return. So all the return cases below should return   */ \
    /* this rv when indicating success.                                    */ \
    /*                                                                     */ \
    if (NS_FAILED(rv))                                                        \
        return rv;                                                            \
    switch(tempData.mType)                                                    \
    {

#define CASE__NUMERIC_CONVERSION_INT32_JUST_CAST(Ctype_)                      \
    case nsIDataType::VTYPE_INT32:                                            \
        *aResult = ( Ctype_ ) tempData.u.mInt32Value;                         \
        return rv;

#define CASE__NUMERIC_CONVERSION_INT32_MIN_MAX(Ctype_, min_, max_)            \
    case nsIDataType::VTYPE_INT32:                                            \
    {                                                                         \
        int32_t value = tempData.u.mInt32Value;                               \
        if (value < min_ || value > max_)                                     \
            return NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;                         \
        *aResult = ( Ctype_ ) value;                                          \
        return rv;                                                            \
    }

#define CASE__NUMERIC_CONVERSION_UINT32_JUST_CAST(Ctype_)                     \
    case nsIDataType::VTYPE_UINT32:                                           \
        *aResult = ( Ctype_ ) tempData.u.mUint32Value;                        \
        return rv;

#define CASE__NUMERIC_CONVERSION_UINT32_MAX(Ctype_, max_)                     \
    case nsIDataType::VTYPE_UINT32:                                           \
    {                                                                         \
        uint32_t value = tempData.u.mUint32Value;                             \
        if (value > max_)                                                     \
            return NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;                         \
        *aResult = ( Ctype_ ) value;                                          \
        return rv;                                                            \
    }

#define CASE__NUMERIC_CONVERSION_DOUBLE_JUST_CAST(Ctype_)                     \
    case nsIDataType::VTYPE_DOUBLE:                                           \
        *aResult = ( Ctype_ ) tempData.u.mDoubleValue;                        \
        return rv;

#define CASE__NUMERIC_CONVERSION_DOUBLE_MIN_MAX(Ctype_, min_, max_)           \
    case nsIDataType::VTYPE_DOUBLE:                                           \
    {                                                                         \
        double value = tempData.u.mDoubleValue;                               \
        if (value < min_ || value > max_)                                     \
            return NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;                         \
        *aResult = ( Ctype_ ) value;                                          \
        return rv;                                                            \
    }

#define CASE__NUMERIC_CONVERSION_DOUBLE_MIN_MAX_INT(Ctype_, min_, max_)       \
    case nsIDataType::VTYPE_DOUBLE:                                           \
    {                                                                         \
        double value = tempData.u.mDoubleValue;                               \
        if (value < min_ || value > max_)                                     \
            return NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;                         \
        *aResult = ( Ctype_ ) value;                                          \
        return (0.0 == fmod(value,1.0)) ?                                     \
            rv : NS_SUCCESS_LOSS_OF_INSIGNIFICANT_DATA;                       \
    }

#define CASES__NUMERIC_CONVERSION_NORMAL(Ctype_, min_, max_)                  \
    CASE__NUMERIC_CONVERSION_INT32_MIN_MAX(Ctype_, min_, max_)                \
    CASE__NUMERIC_CONVERSION_UINT32_MAX(Ctype_, max_)                         \
    CASE__NUMERIC_CONVERSION_DOUBLE_MIN_MAX_INT(Ctype_, min_, max_)

#define NUMERIC_CONVERSION_METHOD_END                                         \
    default:                                                                  \
        NS_ERROR("bad type returned from ToManageableNumber");                \
        return NS_ERROR_CANNOT_CONVERT_DATA;                                  \
    }                                                                         \
}

#define NUMERIC_CONVERSION_METHOD_NORMAL(type_, Ctype_, name_, min_, max_)    \
    NUMERIC_CONVERSION_METHOD_BEGIN(type_, Ctype_, name_)                     \
        CASES__NUMERIC_CONVERSION_NORMAL(Ctype_, min_, max_)                  \
    NUMERIC_CONVERSION_METHOD_END

/***************************************************************************/
// These expand into full public methods...

NUMERIC_CONVERSION_METHOD_NORMAL(VTYPE_INT8, uint8_t, Int8, (-127 - 1), 127)
NUMERIC_CONVERSION_METHOD_NORMAL(VTYPE_INT16, int16_t, Int16, (-32767 - 1), 32767)

NUMERIC_CONVERSION_METHOD_BEGIN(VTYPE_INT32, int32_t, Int32)
  CASE__NUMERIC_CONVERSION_INT32_JUST_CAST(int32_t)
  CASE__NUMERIC_CONVERSION_UINT32_MAX(int32_t, 2147483647)
  CASE__NUMERIC_CONVERSION_DOUBLE_MIN_MAX_INT(int32_t, (-2147483647 - 1), 2147483647)
NUMERIC_CONVERSION_METHOD_END

NUMERIC_CONVERSION_METHOD_NORMAL(VTYPE_UINT8, uint8_t, Uint8, 0, 255)
NUMERIC_CONVERSION_METHOD_NORMAL(VTYPE_UINT16, uint16_t, Uint16, 0, 65535)

NUMERIC_CONVERSION_METHOD_BEGIN(VTYPE_UINT32, uint32_t, Uint32)
  CASE__NUMERIC_CONVERSION_INT32_MIN_MAX(uint32_t, 0, 2147483647)
  CASE__NUMERIC_CONVERSION_UINT32_JUST_CAST(uint32_t)
  CASE__NUMERIC_CONVERSION_DOUBLE_MIN_MAX_INT(uint32_t, 0, 4294967295U)
NUMERIC_CONVERSION_METHOD_END

// XXX toFloat convertions need to be fixed!
NUMERIC_CONVERSION_METHOD_BEGIN(VTYPE_FLOAT, float, Float)
  CASE__NUMERIC_CONVERSION_INT32_JUST_CAST(float)
  CASE__NUMERIC_CONVERSION_UINT32_JUST_CAST(float)
  CASE__NUMERIC_CONVERSION_DOUBLE_JUST_CAST(float)
NUMERIC_CONVERSION_METHOD_END

NUMERIC_CONVERSION_METHOD_BEGIN(VTYPE_DOUBLE, double, Double)
  CASE__NUMERIC_CONVERSION_INT32_JUST_CAST(double)
  CASE__NUMERIC_CONVERSION_UINT32_JUST_CAST(double)
  CASE__NUMERIC_CONVERSION_DOUBLE_JUST_CAST(double)
NUMERIC_CONVERSION_METHOD_END

// XXX toChar convertions need to be fixed!
NUMERIC_CONVERSION_METHOD_BEGIN(VTYPE_CHAR, char, Char)
  CASE__NUMERIC_CONVERSION_INT32_JUST_CAST(char)
  CASE__NUMERIC_CONVERSION_UINT32_JUST_CAST(char)
  CASE__NUMERIC_CONVERSION_DOUBLE_JUST_CAST(char)
NUMERIC_CONVERSION_METHOD_END

// XXX toWChar convertions need to be fixed!
NUMERIC_CONVERSION_METHOD_BEGIN(VTYPE_WCHAR, char16_t, WChar)
  CASE__NUMERIC_CONVERSION_INT32_JUST_CAST(char16_t)
  CASE__NUMERIC_CONVERSION_UINT32_JUST_CAST(char16_t)
  CASE__NUMERIC_CONVERSION_DOUBLE_JUST_CAST(char16_t)
NUMERIC_CONVERSION_METHOD_END

#undef NUMERIC_CONVERSION_METHOD_BEGIN
#undef CASE__NUMERIC_CONVERSION_INT32_JUST_CAST
#undef CASE__NUMERIC_CONVERSION_INT32_MIN_MAX
#undef CASE__NUMERIC_CONVERSION_UINT32_JUST_CAST
#undef CASE__NUMERIC_CONVERSION_UINT32_MIN_MAX
#undef CASE__NUMERIC_CONVERSION_DOUBLE_JUST_CAST
#undef CASE__NUMERIC_CONVERSION_DOUBLE_MIN_MAX
#undef CASE__NUMERIC_CONVERSION_DOUBLE_MIN_MAX_INT
#undef CASES__NUMERIC_CONVERSION_NORMAL
#undef NUMERIC_CONVERSION_METHOD_END
#undef NUMERIC_CONVERSION_METHOD_NORMAL

/***************************************************************************/

// Just leverage a numeric converter for bool (but restrict the values).
// XXX Is this really what we want to do?

nsresult
nsDiscriminatedUnion::ConvertToBool(bool* aResult) const
{
  TRIVIAL_DATA_CONVERTER(VTYPE_BOOL, mBoolValue, aResult)

  double val;
  nsresult rv = ConvertToDouble(&val);
  if (NS_FAILED(rv)) {
    return rv;
  }
  *aResult = 0.0 != val;
  return rv;
}

/***************************************************************************/

nsresult
nsDiscriminatedUnion::ConvertToInt64(int64_t* aResult) const
{
  TRIVIAL_DATA_CONVERTER(VTYPE_INT64, mInt64Value, aResult)
  TRIVIAL_DATA_CONVERTER(VTYPE_UINT64, mUint64Value, aResult)

  nsDiscriminatedUnion tempData;
  nsresult rv = ToManageableNumber(&tempData);
  if (NS_FAILED(rv)) {
    return rv;
  }
  switch (tempData.mType) {
    case nsIDataType::VTYPE_INT32:
      *aResult = tempData.u.mInt32Value;
      return rv;
    case nsIDataType::VTYPE_UINT32:
      *aResult = tempData.u.mUint32Value;
      return rv;
    case nsIDataType::VTYPE_DOUBLE:
      // XXX should check for data loss here!
      *aResult = tempData.u.mDoubleValue;
      return rv;
    default:
      NS_ERROR("bad type returned from ToManageableNumber");
      return NS_ERROR_CANNOT_CONVERT_DATA;
  }
}

nsresult
nsDiscriminatedUnion::ConvertToUint64(uint64_t* aResult) const
{
  return ConvertToInt64((int64_t*)aResult);
}

/***************************************************************************/

bool
nsDiscriminatedUnion::String2ID(nsID* aPid) const
{
  nsAutoString tempString;
  nsAString* pString;

  switch (mType) {
    case nsIDataType::VTYPE_CHAR_STR:
    case nsIDataType::VTYPE_STRING_SIZE_IS:
      return aPid->Parse(u.str.mStringValue);
    case nsIDataType::VTYPE_CSTRING:
      return aPid->Parse(PromiseFlatCString(*u.mCStringValue).get());
    case nsIDataType::VTYPE_UTF8STRING:
      return aPid->Parse(PromiseFlatUTF8String(*u.mUTF8StringValue).get());
    case nsIDataType::VTYPE_ASTRING:
      pString = u.mAStringValue;
      break;
    case nsIDataType::VTYPE_WCHAR_STR:
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
      tempString.Assign(u.wstr.mWStringValue);
      pString = &tempString;
      break;
    default:
      NS_ERROR("bad type in call to String2ID");
      return false;
  }

  char* pChars = ToNewCString(*pString);
  if (!pChars) {
    return false;
  }
  bool result = aPid->Parse(pChars);
  free(pChars);
  return result;
}

nsresult
nsDiscriminatedUnion::ConvertToID(nsID* aResult) const
{
  nsID id;

  switch (mType) {
    case nsIDataType::VTYPE_ID:
      *aResult = u.mIDValue;
      return NS_OK;
    case nsIDataType::VTYPE_INTERFACE:
      *aResult = NS_GET_IID(nsISupports);
      return NS_OK;
    case nsIDataType::VTYPE_INTERFACE_IS:
      *aResult = u.iface.mInterfaceID;
      return NS_OK;
    case nsIDataType::VTYPE_ASTRING:
    case nsIDataType::VTYPE_UTF8STRING:
    case nsIDataType::VTYPE_CSTRING:
    case nsIDataType::VTYPE_CHAR_STR:
    case nsIDataType::VTYPE_WCHAR_STR:
    case nsIDataType::VTYPE_STRING_SIZE_IS:
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
      if (!String2ID(&id)) {
        return NS_ERROR_CANNOT_CONVERT_DATA;
      }
      *aResult = id;
      return NS_OK;
    default:
      return NS_ERROR_CANNOT_CONVERT_DATA;
  }
}

/***************************************************************************/

nsresult
nsDiscriminatedUnion::ToString(nsACString& aOutString) const
{
  mozilla::SmprintfPointer pptr;

  switch (mType) {
    // all the stuff we don't handle...
    case nsIDataType::VTYPE_ASTRING:
    case nsIDataType::VTYPE_UTF8STRING:
    case nsIDataType::VTYPE_CSTRING:
    case nsIDataType::VTYPE_CHAR_STR:
    case nsIDataType::VTYPE_WCHAR_STR:
    case nsIDataType::VTYPE_STRING_SIZE_IS:
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
    case nsIDataType::VTYPE_WCHAR:
      NS_ERROR("ToString being called for a string type - screwy logic!");
      MOZ_FALLTHROUGH;

    // XXX We might want stringified versions of these... ???

    case nsIDataType::VTYPE_VOID:
    case nsIDataType::VTYPE_EMPTY:
      aOutString.SetIsVoid(true);
      return NS_OK;

    case nsIDataType::VTYPE_EMPTY_ARRAY:
    case nsIDataType::VTYPE_ARRAY:
    case nsIDataType::VTYPE_INTERFACE:
    case nsIDataType::VTYPE_INTERFACE_IS:
    default:
      return NS_ERROR_CANNOT_CONVERT_DATA;

    // nsID has its own text formatter.

    case nsIDataType::VTYPE_ID: {
      char* ptr = u.mIDValue.ToString();
      if (!ptr) {
        return NS_ERROR_OUT_OF_MEMORY;
      }
      aOutString.Assign(ptr);
      free(ptr);
      return NS_OK;
    }

    // Can't use Smprintf for floats, since it's locale-dependent
#define CASE__APPENDFLOAT_NUMBER(type_, member_)                        \
    case nsIDataType::type_ :                                           \
    {                                                                   \
        nsAutoCString str;                                              \
        str.AppendFloat(u.member_);                                     \
        aOutString.Assign(str);                                         \
        return NS_OK;                                                   \
    }

    CASE__APPENDFLOAT_NUMBER(VTYPE_FLOAT,  mFloatValue)
    CASE__APPENDFLOAT_NUMBER(VTYPE_DOUBLE, mDoubleValue)

#undef CASE__APPENDFLOAT_NUMBER

    // the rest can be Smprintf'd and use common code.

#define CASE__SMPRINTF_NUMBER(type_, format_, cast_, member_)          \
    case nsIDataType::type_:                                           \
        static_assert(sizeof(cast_) >= sizeof(u.member_),              \
                      "size of type should be at least as big as member"); \
        pptr = mozilla::Smprintf( format_ , (cast_) u.member_);        \
        break;

    CASE__SMPRINTF_NUMBER(VTYPE_INT8,   "%d",   int,      mInt8Value)
    CASE__SMPRINTF_NUMBER(VTYPE_INT16,  "%d",   int,      mInt16Value)
    CASE__SMPRINTF_NUMBER(VTYPE_INT32,  "%d",   int,      mInt32Value)
    CASE__SMPRINTF_NUMBER(VTYPE_INT64,  "%" PRId64, int64_t,  mInt64Value)

    CASE__SMPRINTF_NUMBER(VTYPE_UINT8,  "%u",   unsigned, mUint8Value)
    CASE__SMPRINTF_NUMBER(VTYPE_UINT16, "%u",   unsigned, mUint16Value)
    CASE__SMPRINTF_NUMBER(VTYPE_UINT32, "%u",   unsigned, mUint32Value)
    CASE__SMPRINTF_NUMBER(VTYPE_UINT64, "%" PRIu64, int64_t,  mUint64Value)

    // XXX Would we rather print "true" / "false" ?
    CASE__SMPRINTF_NUMBER(VTYPE_BOOL,   "%d",   int,      mBoolValue)

    CASE__SMPRINTF_NUMBER(VTYPE_CHAR,   "%c",   char,     mCharValue)

#undef CASE__SMPRINTF_NUMBER
  }

  if (!pptr) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  aOutString.Assign(pptr.get());
  return NS_OK;
}

nsresult
nsDiscriminatedUnion::ConvertToAString(nsAString& aResult) const
{
  switch (mType) {
    case nsIDataType::VTYPE_ASTRING:
      aResult.Assign(*u.mAStringValue);
      return NS_OK;
    case nsIDataType::VTYPE_CSTRING:
      CopyASCIItoUTF16(*u.mCStringValue, aResult);
      return NS_OK;
    case nsIDataType::VTYPE_UTF8STRING:
      CopyUTF8toUTF16(*u.mUTF8StringValue, aResult);
      return NS_OK;
    case nsIDataType::VTYPE_CHAR_STR:
      CopyASCIItoUTF16(mozilla::MakeStringSpan(u.str.mStringValue), aResult);
      return NS_OK;
    case nsIDataType::VTYPE_WCHAR_STR:
      aResult.Assign(u.wstr.mWStringValue);
      return NS_OK;
    case nsIDataType::VTYPE_STRING_SIZE_IS:
      CopyASCIItoUTF16(nsDependentCString(u.str.mStringValue,
                                          u.str.mStringLength),
                       aResult);
      return NS_OK;
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
      aResult.Assign(u.wstr.mWStringValue, u.wstr.mWStringLength);
      return NS_OK;
    case nsIDataType::VTYPE_WCHAR:
      aResult.Assign(u.mWCharValue);
      return NS_OK;
    default: {
      nsAutoCString tempCString;
      nsresult rv = ToString(tempCString);
      if (NS_FAILED(rv)) {
        return rv;
      }
      CopyASCIItoUTF16(tempCString, aResult);
      return NS_OK;
    }
  }
}

nsresult
nsDiscriminatedUnion::ConvertToACString(nsACString& aResult) const
{
  switch (mType) {
    case nsIDataType::VTYPE_ASTRING:
      LossyCopyUTF16toASCII(*u.mAStringValue, aResult);
      return NS_OK;
    case nsIDataType::VTYPE_CSTRING:
      aResult.Assign(*u.mCStringValue);
      return NS_OK;
    case nsIDataType::VTYPE_UTF8STRING:
      // XXX This is an extra copy that should be avoided
      // once Jag lands support for UTF8String and associated
      // conversion methods.
      LossyCopyUTF16toASCII(NS_ConvertUTF8toUTF16(*u.mUTF8StringValue),
                            aResult);
      return NS_OK;
    case nsIDataType::VTYPE_CHAR_STR:
      aResult.Assign(*u.str.mStringValue);
      return NS_OK;
    case nsIDataType::VTYPE_WCHAR_STR:
      LossyCopyUTF16toASCII(nsDependentString(u.wstr.mWStringValue),
                            aResult);
      return NS_OK;
    case nsIDataType::VTYPE_STRING_SIZE_IS:
      aResult.Assign(u.str.mStringValue, u.str.mStringLength);
      return NS_OK;
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
      LossyCopyUTF16toASCII(nsDependentString(u.wstr.mWStringValue,
                                              u.wstr.mWStringLength),
                            aResult);
      return NS_OK;
    case nsIDataType::VTYPE_WCHAR: {
      const char16_t* str = &u.mWCharValue;
      LossyCopyUTF16toASCII(Substring(str, 1), aResult);
      return NS_OK;
    }
    default:
      return ToString(aResult);
  }
}

nsresult
nsDiscriminatedUnion::ConvertToAUTF8String(nsAUTF8String& aResult) const
{
  switch (mType) {
    case nsIDataType::VTYPE_ASTRING:
      CopyUTF16toUTF8(*u.mAStringValue, aResult);
      return NS_OK;
    case nsIDataType::VTYPE_CSTRING:
      // XXX Extra copy, can be removed if we're sure CSTRING can
      //     only contain ASCII.
      CopyUTF16toUTF8(NS_ConvertASCIItoUTF16(*u.mCStringValue),
                      aResult);
      return NS_OK;
    case nsIDataType::VTYPE_UTF8STRING:
      aResult.Assign(*u.mUTF8StringValue);
      return NS_OK;
    case nsIDataType::VTYPE_CHAR_STR:
      // XXX Extra copy, can be removed if we're sure CHAR_STR can
      //     only contain ASCII.
      CopyUTF16toUTF8(NS_ConvertASCIItoUTF16(u.str.mStringValue),
                      aResult);
      return NS_OK;
    case nsIDataType::VTYPE_WCHAR_STR:
      CopyUTF16toUTF8(mozilla::MakeStringSpan(u.wstr.mWStringValue), aResult);
      return NS_OK;
    case nsIDataType::VTYPE_STRING_SIZE_IS:
      // XXX Extra copy, can be removed if we're sure CHAR_STR can
      //     only contain ASCII.
      CopyUTF16toUTF8(NS_ConvertASCIItoUTF16(
        nsDependentCString(u.str.mStringValue,
                           u.str.mStringLength)), aResult);
      return NS_OK;
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
      CopyUTF16toUTF8(nsDependentString(u.wstr.mWStringValue,
                                        u.wstr.mWStringLength),
                      aResult);
      return NS_OK;
    case nsIDataType::VTYPE_WCHAR: {
      const char16_t* str = &u.mWCharValue;
      CopyUTF16toUTF8(Substring(str, 1), aResult);
      return NS_OK;
    }
    default: {
      nsAutoCString tempCString;
      nsresult rv = ToString(tempCString);
      if (NS_FAILED(rv)) {
        return rv;
      }
      // XXX Extra copy, can be removed if we're sure tempCString can
      //     only contain ASCII.
      CopyUTF16toUTF8(NS_ConvertASCIItoUTF16(tempCString), aResult);
      return NS_OK;
    }
  }
}

nsresult
nsDiscriminatedUnion::ConvertToString(char** aResult) const
{
  uint32_t ignored;
  return ConvertToStringWithSize(&ignored, aResult);
}

nsresult
nsDiscriminatedUnion::ConvertToWString(char16_t** aResult) const
{
  uint32_t ignored;
  return ConvertToWStringWithSize(&ignored, aResult);
}

nsresult
nsDiscriminatedUnion::ConvertToStringWithSize(uint32_t* aSize, char** aStr) const
{
  nsAutoString  tempString;
  nsAutoCString tempCString;
  nsresult rv;

  switch (mType) {
    case nsIDataType::VTYPE_ASTRING:
      *aSize = u.mAStringValue->Length();
      *aStr = ToNewCString(*u.mAStringValue);
      break;
    case nsIDataType::VTYPE_CSTRING:
      *aSize = u.mCStringValue->Length();
      *aStr = ToNewCString(*u.mCStringValue);
      break;
    case nsIDataType::VTYPE_UTF8STRING: {
      // XXX This is doing 1 extra copy.  Need to fix this
      // when Jag lands UTF8String
      // we want:
      // *aSize = *mUTF8StringValue->Length();
      // *aStr = ToNewCString(*mUTF8StringValue);
      // But this will have to do for now.
      const NS_ConvertUTF8toUTF16 tempString16(*u.mUTF8StringValue);
      *aSize = tempString16.Length();
      *aStr = ToNewCString(tempString16);
      break;
    }
    case nsIDataType::VTYPE_CHAR_STR: {
      nsDependentCString cString(u.str.mStringValue);
      *aSize = cString.Length();
      *aStr = ToNewCString(cString);
      break;
    }
    case nsIDataType::VTYPE_WCHAR_STR: {
      nsDependentString string(u.wstr.mWStringValue);
      *aSize = string.Length();
      *aStr = ToNewCString(string);
      break;
    }
    case nsIDataType::VTYPE_STRING_SIZE_IS: {
      nsDependentCString cString(u.str.mStringValue,
                                 u.str.mStringLength);
      *aSize = cString.Length();
      *aStr = ToNewCString(cString);
      break;
    }
    case nsIDataType::VTYPE_WSTRING_SIZE_IS: {
      nsDependentString string(u.wstr.mWStringValue,
                               u.wstr.mWStringLength);
      *aSize = string.Length();
      *aStr = ToNewCString(string);
      break;
    }
    case nsIDataType::VTYPE_WCHAR:
      tempString.Assign(u.mWCharValue);
      *aSize = tempString.Length();
      *aStr = ToNewCString(tempString);
      break;
    default:
      rv = ToString(tempCString);
      if (NS_FAILED(rv)) {
        return rv;
      }
      *aSize = tempCString.Length();
      *aStr = ToNewCString(tempCString);
      break;
  }

  return *aStr ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
nsresult
nsDiscriminatedUnion::ConvertToWStringWithSize(uint32_t* aSize, char16_t** aStr) const
{
  nsAutoString  tempString;
  nsAutoCString tempCString;
  nsresult rv;

  switch (mType) {
    case nsIDataType::VTYPE_ASTRING:
      *aSize = u.mAStringValue->Length();
      *aStr = ToNewUnicode(*u.mAStringValue);
      break;
    case nsIDataType::VTYPE_CSTRING:
      *aSize = u.mCStringValue->Length();
      *aStr = ToNewUnicode(*u.mCStringValue);
      break;
    case nsIDataType::VTYPE_UTF8STRING: {
      *aStr = UTF8ToNewUnicode(*u.mUTF8StringValue, aSize);
      break;
    }
    case nsIDataType::VTYPE_CHAR_STR: {
      nsDependentCString cString(u.str.mStringValue);
      *aSize = cString.Length();
      *aStr = ToNewUnicode(cString);
      break;
    }
    case nsIDataType::VTYPE_WCHAR_STR: {
      nsDependentString string(u.wstr.mWStringValue);
      *aSize = string.Length();
      *aStr = ToNewUnicode(string);
      break;
    }
    case nsIDataType::VTYPE_STRING_SIZE_IS: {
      nsDependentCString cString(u.str.mStringValue,
                                 u.str.mStringLength);
      *aSize = cString.Length();
      *aStr = ToNewUnicode(cString);
      break;
    }
    case nsIDataType::VTYPE_WSTRING_SIZE_IS: {
      nsDependentString string(u.wstr.mWStringValue,
                               u.wstr.mWStringLength);
      *aSize = string.Length();
      *aStr = ToNewUnicode(string);
      break;
    }
    case nsIDataType::VTYPE_WCHAR:
      tempString.Assign(u.mWCharValue);
      *aSize = tempString.Length();
      *aStr = ToNewUnicode(tempString);
      break;
    default:
      rv = ToString(tempCString);
      if (NS_FAILED(rv)) {
        return rv;
      }
      *aSize = tempCString.Length();
      *aStr = ToNewUnicode(tempCString);
      break;
  }

  return *aStr ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}

nsresult
nsDiscriminatedUnion::ConvertToISupports(nsISupports** aResult) const
{
  switch (mType) {
    case nsIDataType::VTYPE_INTERFACE:
    case nsIDataType::VTYPE_INTERFACE_IS:
      if (u.iface.mInterfaceValue) {
        return u.iface.mInterfaceValue->
          QueryInterface(NS_GET_IID(nsISupports), (void**)aResult);
      } else {
        *aResult = nullptr;
        return NS_OK;
      }
    default:
      return NS_ERROR_CANNOT_CONVERT_DATA;
  }
}

nsresult
nsDiscriminatedUnion::ConvertToInterface(nsIID** aIID,
                                         void** aInterface) const
{
  const nsIID* piid;

  switch (mType) {
    case nsIDataType::VTYPE_INTERFACE:
      piid = &NS_GET_IID(nsISupports);
      break;
    case nsIDataType::VTYPE_INTERFACE_IS:
      piid = &u.iface.mInterfaceID;
      break;
    default:
      return NS_ERROR_CANNOT_CONVERT_DATA;
  }

  *aIID = piid->Clone();

  if (u.iface.mInterfaceValue) {
    return u.iface.mInterfaceValue->QueryInterface(*piid, aInterface);
  }

  *aInterface = nullptr;
  return NS_OK;
}

nsresult
nsDiscriminatedUnion::ConvertToArray(uint16_t* aType, nsIID* aIID,
                                     uint32_t* aCount, void** aPtr) const
{
  // XXX perhaps we'd like to add support for converting each of the various
  // types into an array containing one element of that type. We can leverage
  // CloneArray to do this if we want to support this.

  if (mType == nsIDataType::VTYPE_ARRAY) {
    return CloneArray(u.array.mArrayType, &u.array.mArrayInterfaceID,
                      u.array.mArrayCount, u.array.mArrayValue,
                      aType, aIID, aCount, aPtr);
  }
  return NS_ERROR_CANNOT_CONVERT_DATA;
}

/***************************************************************************/
// static setter functions...

#define DATA_SETTER_PROLOGUE                                                  \
    Cleanup()

#define DATA_SETTER_EPILOGUE(type_)                                           \
    mType = nsIDataType::type_;

#define DATA_SETTER(type_, member_, value_)                                   \
    DATA_SETTER_PROLOGUE;                                                     \
    u.member_ = value_;                                                       \
    DATA_SETTER_EPILOGUE(type_)

#define DATA_SETTER_WITH_CAST(type_, member_, cast_, value_)                  \
    DATA_SETTER_PROLOGUE;                                                     \
    u.member_ = cast_ value_;                                                 \
    DATA_SETTER_EPILOGUE(type_)


/********************************************/

#define CASE__SET_FROM_VARIANT_VTYPE_PROLOGUE(type_)                          \
    {                                                                         \

#define CASE__SET_FROM_VARIANT_VTYPE__GETTER(member_, name_)                  \
        rv = aValue->GetAs##name_ (&(u.member_ ));

#define CASE__SET_FROM_VARIANT_VTYPE__GETTER_CAST(cast_, member_, name_)      \
        rv = aValue->GetAs##name_ ( cast_ &(u.member_ ));

#define CASE__SET_FROM_VARIANT_VTYPE_EPILOGUE(type_)                          \
        if (NS_SUCCEEDED(rv)) {                                               \
          mType  = nsIDataType::type_ ;                                       \
        }                                                                     \
        break;                                                                \
    }

#define CASE__SET_FROM_VARIANT_TYPE(type_, member_, name_)                    \
    case nsIDataType::type_:                                                  \
        CASE__SET_FROM_VARIANT_VTYPE_PROLOGUE(type_)                          \
        CASE__SET_FROM_VARIANT_VTYPE__GETTER(member_, name_)                  \
        CASE__SET_FROM_VARIANT_VTYPE_EPILOGUE(type_)

#define CASE__SET_FROM_VARIANT_VTYPE_CAST(type_, cast_, member_, name_)       \
    case nsIDataType::type_ :                                                 \
        CASE__SET_FROM_VARIANT_VTYPE_PROLOGUE(type_)                          \
        CASE__SET_FROM_VARIANT_VTYPE__GETTER_CAST(cast_, member_, name_)      \
        CASE__SET_FROM_VARIANT_VTYPE_EPILOGUE(type_)


nsresult
nsDiscriminatedUnion::SetFromVariant(nsIVariant* aValue)
{
  uint16_t type;
  nsresult rv;

  Cleanup();

  rv = aValue->GetDataType(&type);
  if (NS_FAILED(rv)) {
    return rv;
  }

  switch (type) {
    CASE__SET_FROM_VARIANT_VTYPE_CAST(VTYPE_INT8, (uint8_t*), mInt8Value,
                                      Int8)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_INT16,  mInt16Value,  Int16)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_INT32,  mInt32Value,  Int32)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_UINT8,  mUint8Value,  Uint8)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_UINT16, mUint16Value, Uint16)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_UINT32, mUint32Value, Uint32)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_FLOAT,  mFloatValue,  Float)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_DOUBLE, mDoubleValue, Double)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_BOOL ,  mBoolValue,   Bool)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_CHAR,   mCharValue,   Char)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_WCHAR,  mWCharValue,  WChar)
    CASE__SET_FROM_VARIANT_TYPE(VTYPE_ID,     mIDValue,     ID)

    case nsIDataType::VTYPE_ASTRING:
    case nsIDataType::VTYPE_WCHAR_STR:
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
      CASE__SET_FROM_VARIANT_VTYPE_PROLOGUE(VTYPE_ASTRING);
      u.mAStringValue = new nsString();
      if (!u.mAStringValue) {
        return NS_ERROR_OUT_OF_MEMORY;
      }
      rv = aValue->GetAsAString(*u.mAStringValue);
      if (NS_FAILED(rv)) {
        delete u.mAStringValue;
      }
      CASE__SET_FROM_VARIANT_VTYPE_EPILOGUE(VTYPE_ASTRING)

    case nsIDataType::VTYPE_CSTRING:
      CASE__SET_FROM_VARIANT_VTYPE_PROLOGUE(VTYPE_CSTRING);
      u.mCStringValue = new nsCString();
      if (!u.mCStringValue) {
        return NS_ERROR_OUT_OF_MEMORY;
      }
      rv = aValue->GetAsACString(*u.mCStringValue);
      if (NS_FAILED(rv)) {
        delete u.mCStringValue;
      }
      CASE__SET_FROM_VARIANT_VTYPE_EPILOGUE(VTYPE_CSTRING)

    case nsIDataType::VTYPE_UTF8STRING:
      CASE__SET_FROM_VARIANT_VTYPE_PROLOGUE(VTYPE_UTF8STRING);
      u.mUTF8StringValue = new nsUTF8String();
      if (!u.mUTF8StringValue) {
        return NS_ERROR_OUT_OF_MEMORY;
      }
      rv = aValue->GetAsAUTF8String(*u.mUTF8StringValue);
      if (NS_FAILED(rv)) {
        delete u.mUTF8StringValue;
      }
      CASE__SET_FROM_VARIANT_VTYPE_EPILOGUE(VTYPE_UTF8STRING)

    case nsIDataType::VTYPE_CHAR_STR:
    case nsIDataType::VTYPE_STRING_SIZE_IS:
      CASE__SET_FROM_VARIANT_VTYPE_PROLOGUE(VTYPE_STRING_SIZE_IS);
      rv = aValue->GetAsStringWithSize(&u.str.mStringLength,
                                       &u.str.mStringValue);
      CASE__SET_FROM_VARIANT_VTYPE_EPILOGUE(VTYPE_STRING_SIZE_IS)

    case nsIDataType::VTYPE_INTERFACE:
    case nsIDataType::VTYPE_INTERFACE_IS:
      CASE__SET_FROM_VARIANT_VTYPE_PROLOGUE(VTYPE_INTERFACE_IS);
      // XXX This iid handling is ugly!
      nsIID* iid;
      rv = aValue->GetAsInterface(&iid, (void**)&u.iface.mInterfaceValue);
      if (NS_SUCCEEDED(rv)) {
        u.iface.mInterfaceID = *iid;
        free((char*)iid);
      }
      CASE__SET_FROM_VARIANT_VTYPE_EPILOGUE(VTYPE_INTERFACE_IS)

    case nsIDataType::VTYPE_ARRAY:
      CASE__SET_FROM_VARIANT_VTYPE_PROLOGUE(VTYPE_ARRAY);
      rv = aValue->GetAsArray(&u.array.mArrayType,
                              &u.array.mArrayInterfaceID,
                              &u.array.mArrayCount,
                              &u.array.mArrayValue);
      CASE__SET_FROM_VARIANT_VTYPE_EPILOGUE(VTYPE_ARRAY)

    case nsIDataType::VTYPE_VOID:
      SetToVoid();
      rv = NS_OK;
      break;
    case nsIDataType::VTYPE_EMPTY_ARRAY:
      SetToEmptyArray();
      rv = NS_OK;
      break;
    case nsIDataType::VTYPE_EMPTY:
      SetToEmpty();
      rv = NS_OK;
      break;
    default:
      NS_ERROR("bad type in variant!");
      rv = NS_ERROR_FAILURE;
      break;
  }
  return rv;
}

void
nsDiscriminatedUnion::SetFromInt8(uint8_t aValue)
{
  DATA_SETTER_WITH_CAST(VTYPE_INT8, mInt8Value, (uint8_t), aValue);
}
void
nsDiscriminatedUnion::SetFromInt16(int16_t aValue)
{
  DATA_SETTER(VTYPE_INT16, mInt16Value, aValue);
}
void
nsDiscriminatedUnion::SetFromInt32(int32_t aValue)
{
  DATA_SETTER(VTYPE_INT32, mInt32Value, aValue);
}
void
nsDiscriminatedUnion::SetFromInt64(int64_t aValue)
{
  DATA_SETTER(VTYPE_INT64, mInt64Value, aValue);
}
void
nsDiscriminatedUnion::SetFromUint8(uint8_t aValue)
{
  DATA_SETTER(VTYPE_UINT8, mUint8Value, aValue);
}
void
nsDiscriminatedUnion::SetFromUint16(uint16_t aValue)
{
  DATA_SETTER(VTYPE_UINT16, mUint16Value, aValue);
}
void
nsDiscriminatedUnion::SetFromUint32(uint32_t aValue)
{
  DATA_SETTER(VTYPE_UINT32, mUint32Value, aValue);
}
void
nsDiscriminatedUnion::SetFromUint64(uint64_t aValue)
{
  DATA_SETTER(VTYPE_UINT64, mUint64Value, aValue);
}
void
nsDiscriminatedUnion::SetFromFloat(float aValue)
{
  DATA_SETTER(VTYPE_FLOAT, mFloatValue, aValue);
}
void
nsDiscriminatedUnion::SetFromDouble(double aValue)
{
  DATA_SETTER(VTYPE_DOUBLE, mDoubleValue, aValue);
}
void
nsDiscriminatedUnion::SetFromBool(bool aValue)
{
  DATA_SETTER(VTYPE_BOOL, mBoolValue, aValue);
}
void
nsDiscriminatedUnion::SetFromChar(char aValue)
{
  DATA_SETTER(VTYPE_CHAR, mCharValue, aValue);
}
void
nsDiscriminatedUnion::SetFromWChar(char16_t aValue)
{
  DATA_SETTER(VTYPE_WCHAR, mWCharValue, aValue);
}
void
nsDiscriminatedUnion::SetFromID(const nsID& aValue)
{
  DATA_SETTER(VTYPE_ID, mIDValue, aValue);
}
void
nsDiscriminatedUnion::SetFromAString(const nsAString& aValue)
{
  DATA_SETTER_PROLOGUE;
  u.mAStringValue = new nsString(aValue);
  DATA_SETTER_EPILOGUE(VTYPE_ASTRING);
}

void
nsDiscriminatedUnion::SetFromACString(const nsACString& aValue)
{
  DATA_SETTER_PROLOGUE;
  u.mCStringValue = new nsCString(aValue);
  DATA_SETTER_EPILOGUE(VTYPE_CSTRING);
}

void
nsDiscriminatedUnion::SetFromAUTF8String(const nsAUTF8String& aValue)
{
  DATA_SETTER_PROLOGUE;
  u.mUTF8StringValue = new nsUTF8String(aValue);
  DATA_SETTER_EPILOGUE(VTYPE_UTF8STRING);
}

nsresult
nsDiscriminatedUnion::SetFromString(const char* aValue)
{
  DATA_SETTER_PROLOGUE;
  if (!aValue) {
    return NS_ERROR_NULL_POINTER;
  }
  return SetFromStringWithSize(strlen(aValue), aValue);
}
nsresult
nsDiscriminatedUnion::SetFromWString(const char16_t* aValue)
{
  DATA_SETTER_PROLOGUE;
  if (!aValue) {
    return NS_ERROR_NULL_POINTER;
  }
  return SetFromWStringWithSize(NS_strlen(aValue), aValue);
}
void
nsDiscriminatedUnion::SetFromISupports(nsISupports* aValue)
{
  return SetFromInterface(NS_GET_IID(nsISupports), aValue);
}
void
nsDiscriminatedUnion::SetFromInterface(const nsIID& aIID, nsISupports* aValue)
{
  DATA_SETTER_PROLOGUE;
  NS_IF_ADDREF(aValue);
  u.iface.mInterfaceValue = aValue;
  u.iface.mInterfaceID = aIID;
  DATA_SETTER_EPILOGUE(VTYPE_INTERFACE_IS);
}
nsresult
nsDiscriminatedUnion::SetFromArray(uint16_t aType, const nsIID* aIID,
                                   uint32_t aCount, void* aValue)
{
  DATA_SETTER_PROLOGUE;
  if (!aValue || !aCount) {
    return NS_ERROR_NULL_POINTER;
  }

  nsresult rv = CloneArray(aType, aIID, aCount, aValue,
                           &u.array.mArrayType,
                           &u.array.mArrayInterfaceID,
                           &u.array.mArrayCount,
                           &u.array.mArrayValue);
  if (NS_FAILED(rv)) {
    return rv;
  }
  DATA_SETTER_EPILOGUE(VTYPE_ARRAY);
  return NS_OK;
}
nsresult
nsDiscriminatedUnion::SetFromStringWithSize(uint32_t aSize,
                                            const char* aValue)
{
  DATA_SETTER_PROLOGUE;
  if (!aValue) {
    return NS_ERROR_NULL_POINTER;
  }
  u.str.mStringValue = (char*) moz_xmemdup(aValue, (aSize + 1) * sizeof(char));
  u.str.mStringLength = aSize;
  DATA_SETTER_EPILOGUE(VTYPE_STRING_SIZE_IS);
  return NS_OK;
}
nsresult
nsDiscriminatedUnion::SetFromWStringWithSize(uint32_t aSize,
                                             const char16_t* aValue)
{
  DATA_SETTER_PROLOGUE;
  if (!aValue) {
    return NS_ERROR_NULL_POINTER;
  }
  u.wstr.mWStringValue =
    (char16_t*) moz_xmemdup(aValue, (aSize + 1) * sizeof(char16_t));
  u.wstr.mWStringLength = aSize;
  DATA_SETTER_EPILOGUE(VTYPE_WSTRING_SIZE_IS);
  return NS_OK;
}
void
nsDiscriminatedUnion::AllocateWStringWithSize(uint32_t aSize)
{
  DATA_SETTER_PROLOGUE;
  u.wstr.mWStringValue = (char16_t*)moz_xmalloc((aSize + 1) * sizeof(char16_t));
  u.wstr.mWStringValue[aSize] = '\0';
  u.wstr.mWStringLength = aSize;
  DATA_SETTER_EPILOGUE(VTYPE_WSTRING_SIZE_IS);
}
void
nsDiscriminatedUnion::SetToVoid()
{
  DATA_SETTER_PROLOGUE;
  DATA_SETTER_EPILOGUE(VTYPE_VOID);
}
void
nsDiscriminatedUnion::SetToEmpty()
{
  DATA_SETTER_PROLOGUE;
  DATA_SETTER_EPILOGUE(VTYPE_EMPTY);
}
void
nsDiscriminatedUnion::SetToEmptyArray()
{
  DATA_SETTER_PROLOGUE;
  DATA_SETTER_EPILOGUE(VTYPE_EMPTY_ARRAY);
}

/***************************************************************************/

void
nsDiscriminatedUnion::Cleanup()
{
  switch (mType) {
    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:
    case nsIDataType::VTYPE_VOID:
    case nsIDataType::VTYPE_ID:
      break;
    case nsIDataType::VTYPE_ASTRING:
      delete u.mAStringValue;
      break;
    case nsIDataType::VTYPE_CSTRING:
      delete u.mCStringValue;
      break;
    case nsIDataType::VTYPE_UTF8STRING:
      delete u.mUTF8StringValue;
      break;
    case nsIDataType::VTYPE_CHAR_STR:
    case nsIDataType::VTYPE_STRING_SIZE_IS:
      free((char*)u.str.mStringValue);
      break;
    case nsIDataType::VTYPE_WCHAR_STR:
    case nsIDataType::VTYPE_WSTRING_SIZE_IS:
      free((char*)u.wstr.mWStringValue);
      break;
    case nsIDataType::VTYPE_INTERFACE:
    case nsIDataType::VTYPE_INTERFACE_IS:
      NS_IF_RELEASE(u.iface.mInterfaceValue);
      break;
    case nsIDataType::VTYPE_ARRAY:
      FreeArray();
      break;
    case nsIDataType::VTYPE_EMPTY_ARRAY:
    case nsIDataType::VTYPE_EMPTY:
      break;
    default:
      NS_ERROR("bad type in variant!");
      break;
  }

  mType = nsIDataType::VTYPE_EMPTY;
}

void
nsDiscriminatedUnion::Traverse(nsCycleCollectionTraversalCallback& aCb) const
{
  switch (mType) {
    case nsIDataType::VTYPE_INTERFACE:
    case nsIDataType::VTYPE_INTERFACE_IS:
      NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mData");
      aCb.NoteXPCOMChild(u.iface.mInterfaceValue);
      break;
    case nsIDataType::VTYPE_ARRAY:
      switch (u.array.mArrayType) {
        case nsIDataType::VTYPE_INTERFACE:
        case nsIDataType::VTYPE_INTERFACE_IS: {
          nsISupports** p = (nsISupports**)u.array.mArrayValue;
          for (uint32_t i = u.array.mArrayCount; i > 0; ++p, --i) {
            NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mData[i]");
            aCb.NoteXPCOMChild(*p);
          }
          break;
        }
        default:
          break;
      }
      break;
    default:
      break;
  }
}

/***************************************************************************/
/***************************************************************************/
// members...

nsVariantBase::nsVariantBase()
  : mWritable(true)
{
}

// For all the data getters we just forward to the static (and sharable)
// 'ConvertTo' functions.

NS_IMETHODIMP
nsVariantBase::GetDataType(uint16_t* aDataType)
{
  *aDataType = mData.GetType();
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::GetAsInt8(uint8_t* aResult)
{
  return mData.ConvertToInt8(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsInt16(int16_t* aResult)
{
  return mData.ConvertToInt16(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsInt32(int32_t* aResult)
{
  return mData.ConvertToInt32(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsInt64(int64_t* aResult)
{
  return mData.ConvertToInt64(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsUint8(uint8_t* aResult)
{
  return mData.ConvertToUint8(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsUint16(uint16_t* aResult)
{
  return mData.ConvertToUint16(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsUint32(uint32_t* aResult)
{
  return mData.ConvertToUint32(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsUint64(uint64_t* aResult)
{
  return mData.ConvertToUint64(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsFloat(float* aResult)
{
  return mData.ConvertToFloat(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsDouble(double* aResult)
{
  return mData.ConvertToDouble(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsBool(bool* aResult)
{
  return mData.ConvertToBool(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsChar(char* aResult)
{
  return mData.ConvertToChar(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsWChar(char16_t* aResult)
{
  return mData.ConvertToWChar(aResult);
}

NS_IMETHODIMP_(nsresult)
nsVariantBase::GetAsID(nsID* aResult)
{
  return mData.ConvertToID(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsAString(nsAString& aResult)
{
  return mData.ConvertToAString(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsACString(nsACString& aResult)
{
  return mData.ConvertToACString(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsAUTF8String(nsAUTF8String& aResult)
{
  return mData.ConvertToAUTF8String(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsString(char** aResult)
{
  return mData.ConvertToString(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsWString(char16_t** aResult)
{
  return mData.ConvertToWString(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsISupports(nsISupports** aResult)
{
  return mData.ConvertToISupports(aResult);
}

NS_IMETHODIMP
nsVariantBase::GetAsJSVal(JS::MutableHandleValue)
{
  // Can only get the jsval from an XPCVariant.
  return NS_ERROR_CANNOT_CONVERT_DATA;
}

NS_IMETHODIMP
nsVariantBase::GetAsInterface(nsIID** aIID, void** aInterface)
{
  return mData.ConvertToInterface(aIID, aInterface);
}

NS_IMETHODIMP_(nsresult)
nsVariantBase::GetAsArray(uint16_t* aType, nsIID* aIID,
                      uint32_t* aCount, void** aPtr)
{
  return mData.ConvertToArray(aType, aIID, aCount, aPtr);
}

NS_IMETHODIMP
nsVariantBase::GetAsStringWithSize(uint32_t* aSize, char** aStr)
{
  return mData.ConvertToStringWithSize(aSize, aStr);
}

NS_IMETHODIMP
nsVariantBase::GetAsWStringWithSize(uint32_t* aSize, char16_t** aStr)
{
  return mData.ConvertToWStringWithSize(aSize, aStr);
}

/***************************************************************************/

NS_IMETHODIMP
nsVariantBase::GetWritable(bool* aWritable)
{
  *aWritable = mWritable;
  return NS_OK;
}
NS_IMETHODIMP
nsVariantBase::SetWritable(bool aWritable)
{
  if (!mWritable && aWritable) {
    return NS_ERROR_FAILURE;
  }
  mWritable = aWritable;
  return NS_OK;
}

/***************************************************************************/

// For all the data setters we just forward to the static (and sharable)
// 'SetFrom' functions.

NS_IMETHODIMP
nsVariantBase::SetAsInt8(uint8_t aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromInt8(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsInt16(int16_t aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromInt16(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsInt32(int32_t aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromInt32(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsInt64(int64_t aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromInt64(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsUint8(uint8_t aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromUint8(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsUint16(uint16_t aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromUint16(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsUint32(uint32_t aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromUint32(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsUint64(uint64_t aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromUint64(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsFloat(float aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromFloat(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsDouble(double aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromDouble(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsBool(bool aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromBool(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsChar(char aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromChar(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsWChar(char16_t aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromWChar(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsID(const nsID& aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromID(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsAString(const nsAString& aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromAString(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsACString(const nsACString& aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromACString(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsAUTF8String(const nsAUTF8String& aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromAUTF8String(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsString(const char* aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  return mData.SetFromString(aValue);
}

NS_IMETHODIMP
nsVariantBase::SetAsWString(const char16_t* aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  return mData.SetFromWString(aValue);
}

NS_IMETHODIMP
nsVariantBase::SetAsISupports(nsISupports* aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromISupports(aValue);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsInterface(const nsIID& aIID, void* aInterface)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetFromInterface(aIID, (nsISupports*)aInterface);
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsArray(uint16_t aType, const nsIID* aIID,
                      uint32_t aCount, void* aPtr)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  return mData.SetFromArray(aType, aIID, aCount, aPtr);
}

NS_IMETHODIMP
nsVariantBase::SetAsStringWithSize(uint32_t aSize, const char* aStr)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  return mData.SetFromStringWithSize(aSize, aStr);
}

NS_IMETHODIMP
nsVariantBase::SetAsWStringWithSize(uint32_t aSize, const char16_t* aStr)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  return mData.SetFromWStringWithSize(aSize, aStr);
}

NS_IMETHODIMP
nsVariantBase::SetAsVoid()
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetToVoid();
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsEmpty()
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetToEmpty();
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetAsEmptyArray()
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  mData.SetToEmptyArray();
  return NS_OK;
}

NS_IMETHODIMP
nsVariantBase::SetFromVariant(nsIVariant* aValue)
{
  if (!mWritable) {
    return NS_ERROR_OBJECT_IS_IMMUTABLE;
  }
  return mData.SetFromVariant(aValue);
}

/* nsVariant implementation */

NS_IMPL_ISUPPORTS(nsVariant, nsIVariant, nsIWritableVariant)


/* nsVariantCC implementation */
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsVariantCC)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
  NS_INTERFACE_MAP_ENTRY(nsIVariant)
  NS_INTERFACE_MAP_ENTRY(nsIWritableVariant)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTION_CLASS(nsVariantCC)

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsVariantCC)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsVariantCC)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsVariantCC)
  tmp->mData.Traverse(cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsVariantCC)
  tmp->mData.Cleanup();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END