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{
Copyright (c) 1998-2002 by Florian Klaempfl
Generate i8086 assembler for in memory related 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 n8086mem;
{$i fpcdefs.inc}
interface
uses
globtype,
symtype,
cgbase,cpuinfo,cpubase,
node,nmem,ncgmem,nx86mem,ni86mem;
type
ti8086addrnode = class(ti86addrnode)
protected
procedure set_labelsym_resultdef; override;
procedure set_absvarsym_resultdef; override;
procedure pass_generate_code;override;
public
get_offset_only: boolean;
end;
ti8086derefnode = class(tx86derefnode)
procedure pass_generate_code;override;
end;
{ tx86vecnode doesn't work for i8086, so we inherit tcgvecnode }
ti8086vecnode = class(tcgvecnode)
protected
function first_arraydef: tnode;override;
procedure update_reference_reg_mul(maybe_const_reg: tregister; regsize: tdef; l: aint);override;
end;
implementation
uses
systems,globals,constexp,
cutils,verbose,
symbase,symconst,symdef,symtable,symsym,symx86,symcpu,
parabase,paramgr,
aasmtai,aasmdata,
nld,ncon,nadd,ncal,ncnv,
cgutils,cgobj,
defutil,hlcgobj,
pass_1,pass_2,ncgutil;
{*****************************************************************************
TI8086ADDRNODE
*****************************************************************************}
procedure ti8086addrnode.set_labelsym_resultdef;
begin
if anf_ofs in addrnodeflags then
resultdef:=voidnearcspointertype
else
inherited;
end;
procedure ti8086addrnode.set_absvarsym_resultdef;
begin
if not(anf_typedaddr in addrnodeflags) then
resultdef:=voidfarpointertype
else
resultdef:=tcpupointerdefclass(cpointerdef).createx86(left.resultdef,x86pt_far);
end;
procedure ti8086addrnode.pass_generate_code;
begin
if get_offset_only then
begin
secondpass(left);
location_reset(location,LOC_REGISTER,OS_16);
location.register:=hlcg.getaddressregister(current_asmdata.CurrAsmList,voidnearpointertype);
if not(left.location.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then
internalerror(2015103003);
hlcg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,left.resultdef,voidnearpointertype,left.location.reference,location.register);
end
else
inherited;
end;
{*****************************************************************************
TI8086DEREFNODE
*****************************************************************************}
procedure ti8086derefnode.pass_generate_code;
var
paraloc1 : tcgpara;
pd : tprocdef;
sym : tsym;
st : tsymtable;
tmpref: treference;
begin
if tcpupointerdef(left.resultdef).x86pointertyp in [x86pt_far,x86pt_huge] then
begin
secondpass(left);
{ assume natural alignment, except for packed records }
if not(resultdef.typ in [recorddef,objectdef]) or
(tabstractrecordsymtable(tabstractrecorddef(resultdef).symtable).usefieldalignment<>1) then
location_reset_ref(location,LOC_REFERENCE,def_cgsize(resultdef),resultdef.alignment,[])
else
location_reset_ref(location,LOC_REFERENCE,def_cgsize(resultdef),1,[]);
if not(left.location.loc in [LOC_CREGISTER,LOC_REGISTER,LOC_CREFERENCE,LOC_REFERENCE,LOC_CONSTANT]) then
hlcg.location_force_reg(current_asmdata.CurrAsmList,left.location,left.resultdef,left.resultdef,true);
case left.location.loc of
LOC_CREGISTER,
LOC_REGISTER:
begin
hlcg.maybe_change_load_node_reg(current_asmdata.CurrAsmList,left,true);
location.reference.base := left.location.register;
location.reference.segment := cg.GetNextReg(left.location.register);
end;
LOC_CREFERENCE,
LOC_REFERENCE:
begin
location.reference.base:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_16,OS_16,left.location.reference,location.reference.base);
location.reference.segment:=cg.getintregister(current_asmdata.CurrAsmList,OS_16);
tmpref:=left.location.reference;
inc(tmpref.offset,2);
cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_16,OS_16,tmpref,location.reference.segment);
end;
LOC_CONSTANT:
begin
location.reference.offset:=left.location.value and $FFFF;
location.reference.segment:=cg.getintregister(current_asmdata.CurrAsmList,OS_16);
cg.a_load_const_reg(current_asmdata.CurrAsmList,OS_16,(left.location.value shr 16) and $FFFF,location.reference.segment);
end;
else
internalerror(2005070302);
end;
if (cs_use_heaptrc in current_settings.globalswitches) and
(cs_checkpointer in current_settings.localswitches) and
not(cs_compilesystem in current_settings.moduleswitches) and
{$ifdef x86}
(tcpupointerdef(left.resultdef).x86pointertyp = tcpupointerdefclass(cpointerdef).default_x86_data_pointer_type) and
{$endif x86}
not(nf_no_checkpointer in flags) and
{ can be NR_NO in case of LOC_CONSTANT }
(location.reference.base<>NR_NO) then
begin
if not searchsym_in_named_module('HEAPTRC','CHECKPOINTER',sym,st) or
(sym.typ<>procsym) then
internalerror(2012010603);
pd:=tprocdef(tprocsym(sym).ProcdefList[0]);
paraloc1.init;
paramanager.getcgtempparaloc(current_asmdata.CurrAsmList,pd,1,paraloc1);
hlcg.a_loadaddr_ref_cgpara(current_asmdata.CurrAsmList,resultdef,location.reference,paraloc1);
paramanager.freecgpara(current_asmdata.CurrAsmList,paraloc1);
paraloc1.done;
hlcg.allocallcpuregisters(current_asmdata.CurrAsmList);
hlcg.a_call_name(current_asmdata.CurrAsmList,pd,'FPC_CHECKPOINTER',[],nil,false);
hlcg.deallocallcpuregisters(current_asmdata.CurrAsmList);
system.include(current_settings.moduleswitches,cs_checkpointer_called);
end;
end
else
inherited pass_generate_code;
end;
{*****************************************************************************
TI8086VECNODE
*****************************************************************************}
function ti8086vecnode.first_arraydef: tnode;
var
arraydef: tcpuarraydef;
procname:string;
begin
if tcpuarraydef(left.resultdef).is_huge then
begin
arraydef:=tcpuarraydef(left.resultdef);
if not (ado_IsConvertedPointer in arraydef.arrayoptions) then
internalerror(2014080701);
if left.nodetype<>typeconvn then
internalerror(2014080702);
procname:='fpc_hugeptr_add_longint';
if cs_hugeptr_arithmetic_normalization in current_settings.localswitches then
procname:=procname+'_normalized';
if arraydef.elementdef.size>1 then
right:=caddnode.create(muln,right,
cordconstnode.create(arraydef.elementdef.size,s32inttype,true));
result:=ccallnode.createintern(procname,
ccallparanode.create(right,
ccallparanode.create(ttypeconvnode(left).left,nil)));
inserttypeconv_internal(result,tx86pointerdef(cpointerdef).getreusablex86(arraydef.elementdef,x86pt_huge));
result:=cderefnode.create(result);
ttypeconvnode(left).left:=nil;
ttypeconvnode(left).free;
left := nil;
right := nil;
firstpass(result);
end
else
result:=inherited;
end;
procedure ti8086vecnode.update_reference_reg_mul(maybe_const_reg: tregister; regsize: tdef; l: aint);
var
saveseg: TRegister;
begin
saveseg:=location.reference.segment;
location.reference.segment:=NR_NO;
inherited;
location.reference.segment:=saveseg;
end;
begin
caddrnode:=ti8086addrnode;
cderefnode:=ti8086derefnode;
cvecnode:=ti8086vecnode;
end.
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