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{
Copyright (c) 1998-2002 by Florian Klaempfl
Common x86 support for call nodes
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit nx86cal;
{$i fpcdefs.inc}
interface
{ $define AnsiStrRef}
uses
symdef,
cgutils,
ncgcal,parabase;
type
{ tx86callnode }
tx86callnode = class(tcgcallnode)
protected
procedure do_release_unused_return_value;override;
procedure set_result_location(realresdef: tstoreddef);override;
function can_call_ref(var ref: treference):boolean;override;
function do_call_ref(ref: treference): tcgpara;override;
end;
implementation
uses
globtype,cgobj,
cgbase,cpubase,cgx86,cga,aasmdata,aasmcpu,
hlcgobj;
{*****************************************************************************
TX86CALLNODE
*****************************************************************************}
procedure tx86callnode.do_release_unused_return_value;
begin
case location.loc of
LOC_FPUREGISTER :
begin
{ release FPU stack }
emit_reg(A_FSTP,S_NO,NR_FPU_RESULT_REG);
tcgx86(cg).dec_fpu_stack;
end
else
inherited do_release_unused_return_value;
end;
end;
procedure tx86callnode.set_result_location(realresdef: tstoreddef);
begin
if (retloc.location^.loc=LOC_FPUREGISTER) then
begin
tcgx86(cg).inc_fpu_stack;
location_reset(location,LOC_FPUREGISTER,retloc.location^.size);
location.register:=retloc.location^.register;
end
else
inherited set_result_location(realresdef);
end;
function tx86callnode.can_call_ref(var ref: treference): boolean;
const
{$if defined(i386)}
save_all_regs=[pocall_far16,pocall_oldfpccall];
{$else}
save_all_regs=[];
{$endif}
begin
tcgx86(cg).make_simple_ref(current_asmdata.CurrAsmList,ref);
{ do not use a ref. for calling conventions which allocate all registers, the reg. allocator cannot handle this, see
also issue #28639, I were not able to create a simple example though to cause the resulting endless spilling }
result:=((getsupreg(ref.base)<first_int_imreg) and (getsupreg(ref.index)<first_int_imreg)) or
not(procdefinition.proccalloption in save_all_regs);
end;
function tx86callnode.do_call_ref(ref: treference): tcgpara;
begin
current_asmdata.CurrAsmList.concat(taicpu.op_ref(A_CALL,S_NO,ref));
result:=hlcg.get_call_result_cgpara(procdefinition,typedef)
end;
end.
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