/* 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/. */

/* Implement shared vtbl methods. */

#include "xptcprivate.h"

/*
 * This is for Windows XP 64-Bit Edition / Server 2003 for AMD64 or later.
 */

extern "C" nsresult
PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint64_t* args,
                   uint64_t *gprData, double *fprData)
{
//
// "this" pointer is first parameter, so parameter count is 3.
//
#define PARAM_GPR_COUNT   3
#define PARAM_FPR_COUNT   3

    nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
    const nsXPTMethodInfo* info = nullptr;
    uint8_t paramCount;
    uint8_t i;

    NS_ASSERTION(self,"no self");

    self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
    NS_ASSERTION(info,"no method info");

    paramCount = info->ParamCount();

    const uint8_t indexOfJSContext = info->IndexOfJSContext();

    uint64_t* ap = args;
    uint32_t iCount = 0;

    for(i = 0; i < paramCount; i++)
    {
        const nsXPTParamInfo& param = info->Param(i);
        const nsXPTType& type = param.GetType();
        nsXPTCMiniVariant* dp = &paramBuffer[i];

        if (i == indexOfJSContext) {
            if (iCount < PARAM_GPR_COUNT)
                iCount++;
            else
                ap++;
        }

        if(param.IsOut() || !type.IsArithmetic())
        {
            if (iCount < PARAM_GPR_COUNT)
                dp->val.p = (void*)gprData[iCount++];
            else
                dp->val.p = (void*)*ap++;

            continue;
        }
        // else
        switch(type)
        {
        case nsXPTType::T_I8:
           if (iCount < PARAM_GPR_COUNT)
              dp->val.i8  = (int8_t)gprData[iCount++];
           else
              dp->val.i8  = *((int8_t*)ap++);
           break;

        case nsXPTType::T_I16:
            if (iCount < PARAM_GPR_COUNT)
               dp->val.i16  = (int16_t)gprData[iCount++];
            else
               dp->val.i16  = *((int16_t*)ap++);
            break;

        case nsXPTType::T_I32:
            if (iCount < PARAM_GPR_COUNT)
               dp->val.i32  = (int32_t)gprData[iCount++];
            else
               dp->val.i32  = *((int32_t*)ap++);
            break;

        case nsXPTType::T_I64:
            if (iCount < PARAM_GPR_COUNT)
               dp->val.i64  = (int64_t)gprData[iCount++];
            else
               dp->val.i64  = *((int64_t*)ap++);
            break;

        case nsXPTType::T_U8:
            if (iCount < PARAM_GPR_COUNT)
               dp->val.u8  = (uint8_t)gprData[iCount++];
            else
               dp->val.u8  = *((uint8_t*)ap++);
            break;

        case nsXPTType::T_U16:
            if (iCount < PARAM_GPR_COUNT)
               dp->val.u16  = (uint16_t)gprData[iCount++];
            else
                dp->val.u16  = *((uint16_t*)ap++);
            break;

        case nsXPTType::T_U32:
            if (iCount < PARAM_GPR_COUNT)
               dp->val.u32  = (uint32_t)gprData[iCount++];
            else
               dp->val.u32  = *((uint32_t*)ap++);
            break;

        case nsXPTType::T_U64:
            if (iCount < PARAM_GPR_COUNT)
               dp->val.u64  = (uint64_t)gprData[iCount++];
            else
               dp->val.u64  = *((uint64_t*)ap++);
            break;

        case nsXPTType::T_FLOAT:
             if (iCount < PARAM_FPR_COUNT)
                // The value in xmm register is already prepared to
                // be retrieved as a float. Therefore, we pass the
                // value verbatim, as a double without conversion.
                dp->val.d  = (double)fprData[iCount++];
             else
                dp->val.f  = *((float*)ap++);
             break;

        case nsXPTType::T_DOUBLE:
              if (iCount < PARAM_FPR_COUNT)
                 dp->val.d  = (double)fprData[iCount++];
              else
                 dp->val.d  = *((double*)ap++);
              break;

        case nsXPTType::T_BOOL:
           if (iCount < PARAM_GPR_COUNT)
              // We need the cast to uint8_t to remove garbage on upper 56-bit
              // at first.
              dp->val.b  = (bool)(uint8_t)gprData[iCount++];
           else
              dp->val.b  = *((bool*)ap++);
           break;

        case nsXPTType::T_CHAR:
           if (iCount < PARAM_GPR_COUNT)
              dp->val.c  = (char)gprData[iCount++];
           else
              dp->val.c  = *((char*)ap++);
           break;

        case nsXPTType::T_WCHAR:
           if (iCount < PARAM_GPR_COUNT)
              dp->val.wc  = (wchar_t)gprData[iCount++];
           else
              dp->val.wc  = *((wchar_t*)ap++);
           break;

        default:
            NS_ERROR("bad type");
            break;
        }
    }

    nsresult result = self->mOuter->CallMethod((uint16_t)methodIndex, info,
                                               paramBuffer);

    return result;
}

#define STUB_ENTRY(n)  /* defined in the assembly file */

#define SENTINEL_ENTRY(n) \
nsresult nsXPTCStubBase::Sentinel##n() \
{ \
    NS_ERROR("nsXPTCStubBase::Sentinel called"); \
    return NS_ERROR_NOT_IMPLEMENTED; \
}

#include "xptcstubsdef.inc"

void
xptc_dummy()
{
}
