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{
Copyright (c) 1998-2012 by Florian Klaempfl and others
Generate i8086 assembler for constants
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 n8086con;
{$i fpcdefs.inc}
interface
uses
globtype,symtype,ncon,ncgcon,nx86con;
type
{ ti8086pointerconstnode }
ti8086pointerconstnode = class(tcgpointerconstnode)
constructor create(v : TConstPtrUInt;def:tdef);override;
procedure printnodedata(var t: text);override;
{$ifdef DEBUG_NODE_XML}
procedure XMLPrintNodeData(var T: Text); override;
{$endif DEBUG_NODE_XML}
procedure pass_generate_code;override;
end;
implementation
uses
systems,globals,verbose,
symconst,symdef,symcpu,
defutil,
cpubase,
cga,cgx86,cgobj,cgbase,cgutils,
node;
{*****************************************************************************
T8086POINTERCONSTNODE
*****************************************************************************}
constructor ti8086pointerconstnode.create(v: TConstPtrUInt; def: tdef);
begin
{ truncate near pointers }
if (def.typ<>pointerdef) or not (tcpupointerdef(def).x86pointertyp in [x86pt_far,x86pt_huge]) then
v := Word(v);
inherited create(v, def);
end;
procedure ti8086pointerconstnode.printnodedata(var t: text);
begin
if (typedef.typ=pointerdef) and (tcpupointerdef(typedef).x86pointertyp in [x86pt_far,x86pt_huge]) then
writeln(t,printnodeindention,'value = $',hexstr(word(value shr 16),4),':',hexstr(word(value),4))
else
inherited printnodedata(t);
end;
{$ifdef DEBUG_NODE_XML}
procedure Ti8086PointerConstNode.XMLPrintNodeData(var T: Text);
begin
if (typedef.typ=pointerdef) and (tcpupointerdef(typedef).x86pointertyp in [x86pt_far,x86pt_huge]) then
WriteLn(T, PrintNodeIndention, '<value>$', hexstr(word(value shr 16),4),':',hexstr(word(value),4), '</value>')
else
inherited XMLPrintNodeData(T);
end;
{$endif DEBUG_NODE_XML}
procedure ti8086pointerconstnode.pass_generate_code;
begin
{ far pointer? }
if (typedef.typ=pointerdef) and (tcpupointerdef(typedef).x86pointertyp in [x86pt_far,x86pt_huge]) then
begin
location_reset(location,LOC_CONSTANT,OS_32);
location.value:=longint(value);
end
else
begin
{ an integer const. behaves as a memory reference }
location_reset(location,LOC_CONSTANT,OS_ADDR);
location.value:=aint(value);
end;
end;
begin
cpointerconstnode:=ti8086pointerconstnode;
end.
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