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