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lightning-sunbird  0.9+nobinonly
xptcinvoke_openvms_alpha.cpp
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00001 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either of the GNU General Public License Version 2 or later (the "GPL"),
00026  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /* Platform specific code to invoke XPCOM methods on native objects */
00039 
00040 #include "xptcprivate.h"
00041 
00042 extern "C" {
00043 
00044 /* This is in the ASM file */
00045 XPTC_PUBLIC_API(nsresult)
00046 XPTC_InvokeByIndex(nsISupports* that, PRUint32 methodIndex,
00047                    PRUint32 paramCount, nsXPTCVariant* params);
00048 
00049 
00050 void
00051 invoke_copy_to_stack(PRUint64* d, PRUint32 paramCount, nsXPTCVariant* s)
00052 {
00053     const PRUint8 NUM_ARG_REGS = 6-1;        // -1 for "this" pointer
00054 
00055     for(PRUint32 i = 0; i < paramCount; i++, d++, s++)
00056     {
00057         if(s->IsPtrData())
00058         {
00059             *d = (PRUint64)s->ptr;
00060             continue;
00061         }
00062         switch(s->type)
00063         {
00064        /*
00065        ** The line for T_U32 may look wrong (we use signed value for an
00066        ** unsigned data type), but it is right. Why? The Alpha calling 
00067        ** standard is defined to sign extend all 32-bit values, regardless
00068        ** of whether they are int, unsigned int, or 32-bit pointer. The 
00069        ** caller must "sign-extend" it by replicating bit 31 in bits 32
00070        ** thru 63 (yes, even for unsigned). This is the format that results
00071        ** naturally from the LDL instruction, the ADDL instruction, etc.
00072        */
00073         case nsXPTType::T_I8     : *d = (PRUint64)s->val.i8;     break;
00074         case nsXPTType::T_I16    : *d = (PRUint64)s->val.i16;    break;
00075         case nsXPTType::T_I32    : *d = (PRUint64)s->val.i32;    break;
00076         case nsXPTType::T_I64    : *d = (PRUint64)s->val.i64;    break;
00077         case nsXPTType::T_U8     : *d = (PRUint64)s->val.u8;     break;
00078         case nsXPTType::T_U16    : *d = (PRUint64)s->val.u16;    break;
00079         case nsXPTType::T_U32    : *d = (PRUint64)s->val.i32;    break;
00080         case nsXPTType::T_U64    : *d = (PRUint64)s->val.u64;    break;
00081         case nsXPTType::T_FLOAT  :
00082             if(i < NUM_ARG_REGS)
00083             {
00084                 // convert floats to doubles if they are to be passed
00085                 // via registers so we can just deal with doubles later
00086                 union { PRUint64 u64; double d; } t;
00087                 t.d = (double)s->val.f;
00088                 *d = t.u64;
00089             }
00090             else
00091                 // otherwise copy to stack normally
00092                 *d = (PRUint64)s->val.u32;
00093             break;
00094         case nsXPTType::T_DOUBLE : *d = (PRUint64)s->val.u64;    break;
00095         case nsXPTType::T_BOOL   : *d = (PRUint64)s->val.b;      break;
00096         case nsXPTType::T_CHAR   : *d = (PRUint64)s->val.c;      break;
00097         case nsXPTType::T_WCHAR  : *d = (PRUint64)s->val.wc;     break;
00098         default:
00099             // all the others are plain pointer types
00100             *d = (PRUint64)s->val.p;
00101             break;
00102         }
00103     }
00104 }
00105 
00106 }
00107