/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Stuart Parmenter <pavlov@netscape.com>
 *   Chris Seawood <cls@seawood.org>
 *
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/* Platform specific code to invoke XPCOM methods on native objects */

#include "xptcprivate.h"

#if !defined(__sparc) && !defined(__sparc__)
#error "This code is for Sparc only"
#endif

/* Prototype specifies unmangled function name */
extern "C" PRUint64
invoke_copy_to_stack(PRUint64* d, PRUint32 paramCount, nsXPTCVariant* s);

extern "C" PRUint64
invoke_copy_to_stack(PRUint64* d, PRUint32 paramCount, nsXPTCVariant* s)
{
  /*
    We need to copy the parameters for this function to locals and use them
    from there since the parameters occupy the same stack space as the stack
    we're trying to populate.
  */
  PRUint64 *l_d = d;
  nsXPTCVariant *l_s = s;
  PRUint64 l_paramCount = paramCount;
  PRUint64 regCount = 0;  // return the number of registers to load from the stack

  for(PRUint64 i = 0; i < l_paramCount; i++, l_d++, l_s++)
  {
    if (regCount < 5) regCount++;

    if (l_s->IsPtrData())
    {
      *l_d = (PRUint64)l_s->ptr;
      continue;
    }
    switch (l_s->type)
    {
      case nsXPTType::T_I8    : *((PRInt64*)l_d)     = l_s->val.i8;    break;
      case nsXPTType::T_I16   : *((PRInt64*)l_d)     = l_s->val.i16;   break;
      case nsXPTType::T_I32   : *((PRInt64*)l_d)     = l_s->val.i32;   break;
      case nsXPTType::T_I64   : *((PRInt64*)l_d)     = l_s->val.i64;   break;
      
      case nsXPTType::T_U8    : *((PRUint64*)l_d)    = l_s->val.u8;    break;
      case nsXPTType::T_U16   : *((PRUint64*)l_d)    = l_s->val.u16;   break;
      case nsXPTType::T_U32   : *((PRUint64*)l_d)    = l_s->val.u32;   break;
      case nsXPTType::T_U64   : *((PRUint64*)l_d)    = l_s->val.u64;   break;

      /* in the case of floats, we want to put the bits in to the
         64bit space right justified... floats in the parameter array on
         sparcv9 use odd numbered registers.. %f1, %f3, so we have to skip
         the space that would be occupied by %f0, %f2, etc.
      */
      case nsXPTType::T_FLOAT : *(((float*)l_d) + 1) = l_s->val.f;     break;
      case nsXPTType::T_DOUBLE: *((double*)l_d)      = l_s->val.d;     break;
      case nsXPTType::T_BOOL  : *((PRBool*)l_d)      = l_s->val.b;     break;
      case nsXPTType::T_CHAR  : *((PRUint64*)l_d)    = l_s->val.c;     break;
      case nsXPTType::T_WCHAR : *((PRInt64*)l_d)     = l_s->val.wc;    break;

      default:
        // all the others are plain pointer types
        *((void**)l_d) = l_s->val.p;
        break;
    }
  }
  
  return regCount;
}
