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Minimal test - lines (13, 59)

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__attribute__ ((regparm (3)))
PrepareAndDispatch(uint32_t methodIndex, nsXPTCStubBase* self, uint32_t* args)
{

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

    NS_ASSERTION(self,"no self");

    self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
    paramCount = info->GetParamCount();

    const uint8_t indexOfJSContext = info->IndexOfJSContext();

    uint32_t* ap = args;
    for(i = 0; i < paramCount; i++, ap++)
    {
        const nsXPTParamInfo& param = info->GetParam(i);
        const nsXPTType& type = param.GetType();
        nsXPTCMiniVariant* dp = ¶mBuffer[i];

        if (i == indexOfJSContext)
            ap++;

        if(param.IsOut() || !type.IsArithmetic())
        {
            dp->val.p = (void*) *ap;
            continue;
        }
        // else
	    dp->val.p = (void*) *ap;
        switch(type)
        {
        case nsXPTType::T_I64    : dp->val.i64 = *((int64_t*) ap); ap++; break;
        case nsXPTType::T_U64    : dp->val.u64 = *((uint64_t*)ap); ap++; break;
        case nsXPTType::T_DOUBLE : dp->val.d   = *((double*)  ap); ap++; break;
        default                  : break;
        }
    }

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

    return result;
}