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-{
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- $Id$
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- Copyright (c) 1998-2002 by Kovacs Attila Zoltan
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-
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- Generate arm assembly wrapper code interface implementor objects
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-
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- This program is free software; you can redistribute it and/or modify
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- it under the terms of the GNU General Public License as published by
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- the Free Software Foundation; either version 2 of the License, or
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- (at your option) any later version.
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-
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- This program is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- GNU General Public License for more details.
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-
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- You should have received a copy of the GNU General Public License
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- along with this program; if not, write to the Free Software
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- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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-
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- ****************************************************************************
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-}
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-unit narmobj;
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-
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-{$i fpcdefs.inc}
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-
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-interface
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-
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-
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-implementation
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-
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-uses
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- systems,
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- verbose,globals,globtype,
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- aasmbase,aasmtai,aasmcpu,
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- symconst,symdef,
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- fmodule,
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- nobj,
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- cpuinfo,cpubase,
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- cgutils,cgobj;
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-
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- type
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- tarmclassheader=class(tclassheader)
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- protected
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- procedure cgintfwrapper(asmlist: TAAsmoutput; procdef: tprocdef; const labelname: string; ioffset: longint);override;
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- end;
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-
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-{
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-possible calling conventions:
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- default stdcall cdecl pascal register saveregisters
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-default(0): OK OK OK(1) OK OK OK
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-virtual(2): OK OK OK(3) OK OK OK(4)
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-
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-(0):
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- set self parameter to correct value
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- jmp mangledname
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-
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-(1): The code is the following
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- set self parameter to correct value
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- call mangledname
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- set self parameter to interface value
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-
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-(2): The wrapper code use %eax to reach the virtual method address
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- set self to correct value
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- move self,%eax
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- mov 0(%eax),%eax ; load vmt
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- jmp vmtoffs(%eax) ; method offs
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-
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-(3): The wrapper code use %eax to reach the virtual method address
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- set self to correct value
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- move self,%eax
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- mov 0(%eax),%eax ; load vmt
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- jmp vmtoffs(%eax) ; method offs
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- set self parameter to interface value
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-
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-
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-(4): Virtual use eax to reach the method address so the following code be generated:
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- set self to correct value
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- push %ebx ; allocate space for function address
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- push %eax
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- mov self,%eax
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- mov 0(%eax),%eax ; load vmt
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- mov vmtoffs(%eax),eax ; method offs
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- mov %eax,4(%esp)
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- pop %eax
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- ret 0; jmp the address
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-
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-}
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-
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-procedure tarmclassheader.cgintfwrapper(asmlist: TAAsmoutput; procdef: tprocdef; const labelname: string; ioffset: longint);
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-
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- procedure loadvmttor12;
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- var
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- href : treference;
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- begin
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- reference_reset_base(href,NR_R0,0);
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- cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_ADDR,href,NR_R12);
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- end;
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-
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- procedure op_onr12methodaddr;
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- var
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- href : treference;
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- begin
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- if (procdef.extnumber=$ffff) then
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- Internalerror(200006139);
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- { call/jmp vmtoffs(%eax) ; method offs }
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- reference_reset_base(href,NR_R12,procdef._class.vmtmethodoffset(procdef.extnumber));
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- cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_ADDR,href,NR_R12);
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- exprasmlist.concat(taicpu.op_reg_reg(A_MOV,NR_PC,NR_R12));
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- end;
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-
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-var
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- oldexprasmlist: TAAsmoutput;
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- lab : tasmsymbol;
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- make_global : boolean;
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- href : treference;
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-begin
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- if procdef.proctypeoption<>potype_none then
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- Internalerror(200006137);
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- if not assigned(procdef._class) or
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- (procdef.procoptions*[po_classmethod, po_staticmethod,
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- po_methodpointer, po_interrupt, po_iocheck]<>[]) then
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- Internalerror(200006138);
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- if procdef.owner.symtabletype<>objectsymtable then
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- Internalerror(200109191);
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-
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- oldexprasmlist:=exprasmlist;
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- exprasmlist:=asmlist;
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-
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- make_global:=false;
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- if (not current_module.is_unit) or
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- (cs_create_smart in aktmoduleswitches) or
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- (procdef.owner.defowner.owner.symtabletype=globalsymtable) then
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- make_global:=true;
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-
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- if make_global then
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- exprasmList.concat(Tai_symbol.Createname_global(labelname,AT_FUNCTION,0))
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- else
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- exprasmList.concat(Tai_symbol.Createname(labelname,AT_FUNCTION,0));
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-
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- { set param1 interface to self }
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- adjustselfvalue(procdef,ioffset);
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-
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- { case 4 }
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- if po_virtualmethod in procdef.procoptions then
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- begin
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- loadvmttor12;
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- op_onr12methodaddr;
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- end
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- { case 0 }
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- else
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- asmlist.concat(taicpu.op_sym(A_B,objectlibrary.newasmsymbol(procdef.mangledname,AB_EXTERNAL,AT_FUNCTION)));
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-
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- exprasmList.concat(Tai_symbol_end.Createname(labelname));
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-
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- exprasmlist:=oldexprasmlist;
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-end;
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-
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-
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-initialization
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- cclassheader:=tarmclassheader;
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-end.
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-{
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- $Log$
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- Revision 1.2 2004-03-22 22:19:02 florian
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- * interface trampolines (hopyfully) fixed
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-
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- Revision 1.1 2004/03/21 22:40:15 florian
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- + added interface support for the arm
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- * added FPC_REQUIRES_PROPER_ALIGNMENT define for targets which require proper alignment
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-}
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florian