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{
Copyright (c) 1998-2011 by Florian Klaempfl, Jonas Maebe
Generates i8086 assembler for typed constant declarations
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 n8086tcon;
{$i fpcdefs.inc}
interface
uses
node,symdef,ngtcon;
type
{ ti8086typedconstbuilder }
ti8086typedconstbuilder = class(tasmlisttypedconstbuilder)
protected
procedure tc_emit_orddef(def: torddef; var node: tnode);override;
procedure tc_emit_pointerdef(def: tpointerdef; var node: tnode);override;
end;
implementation
uses
verbose,
ncon,ncnv,ninl,nld,
defcmp,defutil,
aasmtai,
symconst,symtype,symsym,symcpu,
htypechk;
{ ti8086typedconstbuilder }
procedure ti8086typedconstbuilder.tc_emit_orddef(def: torddef; var node: tnode);
var
hp: tnode;
srsym: tsym;
pd: tprocdef;
resourcestrrec: trecorddef;
begin
{ support word/smallint constants, initialized with Seg() }
if (def.ordtype in [u16bit,s16bit]) and (node.nodetype=inlinen) and
(tinlinenode(node).inlinenumber=in_seg_x) then
begin
hp:=tunarynode(node).left;
if hp.nodetype=loadn then
begin
srsym:=tloadnode(hp).symtableentry;
case srsym.typ of
procsym :
begin
pd:=tprocdef(tprocsym(srsym).ProcdefList[0]);
if Tprocsym(srsym).ProcdefList.Count>1 then
Message(parser_e_no_overloaded_procvars);
if po_abstractmethod in pd.procoptions then
Message(type_e_cant_take_address_of_abstract_method)
else
ftcb.emit_tai(Tai_const.Create_seg_name(pd.mangledname),u16inttype);
end;
staticvarsym :
ftcb.emit_tai(Tai_const.Create_seg_name(tstaticvarsym(srsym).mangledname),u16inttype);
labelsym :
ftcb.emit_tai(Tai_const.Create_seg_name(tlabelsym(srsym).mangledname),u16inttype);
else
Message(type_e_variable_id_expected);
end;
end
else
Message(parser_e_illegal_expression);
end
{ support word/smallint constants, initialized with Ofs() or Word(@s) }
else if (def.ordtype in [u16bit,s16bit]) and (node.nodetype=typeconvn) and
((Ttypeconvnode(node).left.nodetype=addrn) or
is_proc2procvar_load(Ttypeconvnode(node).left,pd)) then
begin
hp:=tunarynode(Ttypeconvnode(node).left).left;
if hp.nodetype=loadn then
begin
srsym:=tloadnode(hp).symtableentry;
case srsym.typ of
procsym :
begin
pd:=tprocdef(tprocsym(srsym).ProcdefList[0]);
if Tprocsym(srsym).ProcdefList.Count>1 then
Message(parser_e_no_overloaded_procvars);
if po_abstractmethod in pd.procoptions then
Message(type_e_cant_take_address_of_abstract_method)
else
ftcb.emit_tai(Tai_const.Createname(pd.mangledname,0),u16inttype);
end;
staticvarsym :
ftcb.emit_tai(Tai_const.Createname(tstaticvarsym(srsym).mangledname,0),u16inttype);
labelsym :
ftcb.emit_tai(Tai_const.Createname(tlabelsym(srsym).mangledname,0),u16inttype);
else
Message(type_e_variable_id_expected);
end;
end
else
Message(parser_e_illegal_expression);
end
else
inherited;
end;
procedure ti8086typedconstbuilder.tc_emit_pointerdef(def: tpointerdef; var node: tnode);
var
hp: tnode;
begin
{ remove equal typecasts for pointer/nil addresses }
if (node.nodetype=typeconvn) then
with Ttypeconvnode(node) do
if (left.nodetype in [addrn,niln]) and equal_defs(def,node.resultdef) then
begin
hp:=left;
left:=nil;
node.free;
node:=hp;
end;
{ const pointer ? }
if (node.nodetype = pointerconstn) then
begin
ftcb.queue_init(def);
if is_farpointer(def) or is_hugepointer(def) then
begin
ftcb.queue_typeconvn(s32inttype,def);
ftcb.queue_emit_ordconst(longint(tpointerconstnode(node).value),s32inttype);
end
else
begin
ftcb.queue_typeconvn(s16inttype,def);
ftcb.queue_emit_ordconst(smallint(tpointerconstnode(node).value),s16inttype);
end;
end
else if node.nodetype=niln then
begin
if is_farpointer(def) or is_hugepointer(def) then
ftcb.emit_tai(Tai_const.Create_32bit(0),u32inttype)
else
ftcb.emit_tai(Tai_const.Create_16bit(0),u16inttype);
end
else
inherited tc_emit_pointerdef(def, node);
end;
begin
ctypedconstbuilder:=ti8086typedconstbuilder;
end.
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