/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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"

#if !defined(__NetBSD__) || !defined(__m68k__)
#error This code is for NetBSD/m68k only
#endif

extern "C" {
    static nsresult ATTRIBUTE_USED
    PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint32_t* args)
    {
#define PARAM_BUFFER_COUNT     16

        nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
        nsXPTCMiniVariant* dispatchParams = nullptr;
        nsIInterfaceInfo* iface_info = nullptr;
        const nsXPTMethodInfo* info;
        uint8_t paramCount;
        uint8_t i;
        nsresult result = NS_ERROR_FAILURE;

        NS_ASSERTION(self,"no self");

        self->GetInterfaceInfo(&iface_info);
        NS_ASSERTION(iface_info,"no interface info");

        iface_info->GetMethodInfo(uint16_t(methodIndex), &info);
        NS_ASSERTION(info,"no interface info");

        paramCount = info->GetParamCount();

        // setup variant array pointer
        if(paramCount > PARAM_BUFFER_COUNT)
            dispatchParams = new nsXPTCMiniVariant[paramCount];
        else
            dispatchParams = paramBuffer;
        NS_ASSERTION(dispatchParams,"no place for params");

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

            if(param.IsOut() || !type.IsArithmetic())
            {
                dp->val.p = (void*) *ap;
                continue;
            }

            switch(type)
            {
            // the 8 and 16 bit types will have been promoted to 32 bits before
            // being pushed onto the stack. Since the 68k is big endian, we
            // need to skip over the leading high order bytes.
            case nsXPTType::T_I8     : dp->val.i8  = *(((int8_t*) ap) + 3);  break;
            case nsXPTType::T_I16    : dp->val.i16 = *(((int16_t*) ap) + 1); break;
            case nsXPTType::T_I32    : dp->val.i32 = *((int32_t*) ap);       break;
            case nsXPTType::T_I64    : dp->val.i64 = *((int64_t*) ap); ap++; break;
            case nsXPTType::T_U8     : dp->val.u8  = *(((uint8_t*) ap) + 3); break;
            case nsXPTType::T_U16    : dp->val.u16 = *(((uint16_t*)ap) + 1); break;
            case nsXPTType::T_U32    : dp->val.u32 = *((uint32_t*)ap);       break;
            case nsXPTType::T_U64    : dp->val.u64 = *((uint64_t*)ap); ap++; break;
            case nsXPTType::T_FLOAT  : dp->val.f   = *((float*)   ap);       break;
            case nsXPTType::T_DOUBLE : dp->val.d   = *((double*)  ap); ap++; break;
            case nsXPTType::T_BOOL   : dp->val.b   = *(((char*)   ap) + 3);  break;
            case nsXPTType::T_CHAR   : dp->val.c   = *(((char*)   ap) + 3);  break;
            // wchar_t is an int (32 bits) on NetBSD
            case nsXPTType::T_WCHAR  : dp->val.wc  = *((wchar_t*) ap);       break;
            default:
                NS_ERROR("bad type");
                break;
            }
        }

        result = self->CallMethod((uint16_t)methodIndex, info, dispatchParams);

        NS_RELEASE(iface_info);

        if(dispatchParams != paramBuffer)
            delete [] dispatchParams;

        return result;
    }
}

#define STUB_ENTRY(n)							\
__asm__(								\
    ".global	_Stub"#n"__14nsXPTCStubBase\n\t"			\
"_Stub"#n"__14nsXPTCStubBase:\n\t"					\
    "link  a6,#0			\n\t"				\
    "lea   a6@(12), a0			\n\t"	/* pointer to args */	\
    "movl  a0, sp@-			\n\t"				\
    "movl  #"#n", sp@-			\n\t"	/* method index */	\
    "movl  a6@(8), sp@-			\n\t"	/* this */		\
    "jbsr  _PrepareAndDispatch		\n\t"				\
    "unlk  a6				\n\t"				\
    "rts				\n\t"				\
);

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

#include "xptcstubsdef.inc"