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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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+ { using a_call here causes an internalerror because pi_do_call
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+ isn't set properly }
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+ exprasmlist.concat(taicpu.op_reg_reg(A_MOV,NR_R14,NR_PC));
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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 1.1 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