/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * for the specific language governing rights and limitations under the
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 * The Original Code is mozilla.org code.
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/* Implement shared vtbl methods. */

#include "xptcprivate.h"

extern "C" {
    nsresult
    PrepareAndDispatch(nsXPTCStubBase* self, uint32 methodIndex, uint32* args)
    {
#define PARAM_BUFFER_COUNT     16

        nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
        nsXPTCMiniVariant* dispatchParams = NULL;
        nsIInterfaceInfo* iface_info = NULL;
        const nsXPTMethodInfo* info;
        PRUint8 paramCount;
        PRUint8 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(PRUint16(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");

        PRUint32* 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  = *(((PRInt8*) ap) + 3);  break;
            case nsXPTType::T_I16    : dp->val.i16 = *(((PRInt16*) ap) + 1); break;
            case nsXPTType::T_I32    : dp->val.i32 = *((PRInt32*) ap);       break;
            case nsXPTType::T_I64    : dp->val.i64 = *((PRInt64*) ap); ap++; break;
            case nsXPTType::T_U8     : dp->val.u8  = *(((PRUint8*) ap) + 3); break;
            case nsXPTType::T_U16    : dp->val.u16 = *(((PRUint16*)ap) + 1); break;
            case nsXPTType::T_U32    : dp->val.u32 = *((PRUint32*)ap);       break;
            case nsXPTType::T_U64    : dp->val.u64 = *((PRUint64*)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   = *((PRBool*)  ap);       break;
            case nsXPTType::T_CHAR   : dp->val.c   = *(((char*)   ap) + 3);  break;
            case nsXPTType::T_WCHAR  : dp->val.wc  = *((wchar_t*) ap);       break;
            default:
                NS_ASSERTION(0, "bad type");
                break;
            }
        }

        result = self->CallMethod((PRUint16)methodIndex, info, dispatchParams);

        NS_RELEASE(iface_info);

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

        return result;
    }
}

#define STUB_ENTRY(n) \
nsresult nsXPTCStubBase::Stub##n() \
{ \
  register nsresult result asm("d0"); \
  void *frame = __builtin_frame_address(0); \
  __asm__ __volatile__( \
    "pea   %2@(12)\n\t"             /* args */ \
    "pea  "#n"\n\t"                 /* method index */ \
    "movl  %1, %/sp@-\n\t"          /* this */ \
    "jbsr  PrepareAndDispatch\n\t" \
    "addw  #12, %/sp" \
    : "=d" (result)     /* %0 */ \
    : "a" (this), "a" (frame) \
    : "a0", "a1", "d0", "d1", "memory" ); \
    return result; \
}

#define SENTINEL_ENTRY(n) \
nsresult nsXPTCStubBase::Sentinel##n() \
{ \
    NS_ASSERTION(0,"nsXPTCStubBase::Sentinel called"); \
    return NS_ERROR_NOT_IMPLEMENTED; \
}

#include "xptcstubsdef.inc"
