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493 lines
19 KiB
ObjectPascal
493 lines
19 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2000 by Florian Klaempfl
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Generate i386 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 n386con;
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{$i defines.inc}
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interface
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uses
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ncon;
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type
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ti386realconstnode = class(trealconstnode)
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procedure pass_2;override;
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end;
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ti386fixconstnode = class(tfixconstnode)
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procedure pass_2;override;
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end;
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ti386ordconstnode = class(tordconstnode)
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procedure pass_2;override;
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end;
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ti386pointerconstnode = class(tpointerconstnode)
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procedure pass_2;override;
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end;
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ti386stringconstnode = class(tstringconstnode)
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procedure pass_2;override;
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end;
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ti386setconstnode = class(tsetconstnode)
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procedure pass_2;override;
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end;
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ti386nilnode = class(tnilnode)
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procedure pass_2;override;
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end;
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implementation
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uses
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globtype,systems,
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cobjects,verbose,globals,
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symconst,symtable,aasm,
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hcodegen,temp_gen,pass_2,
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cpubase,cpuasm,
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cgai386,tgeni386;
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{*****************************************************************************
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TI386REALCONSTNODE
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*****************************************************************************}
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procedure ti386realconstnode.pass_2;
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const
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floattype2ait:array[tfloattype] of tait=
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(ait_real_32bit,ait_real_64bit,ait_real_80bit,ait_comp_64bit,ait_none,ait_none);
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var
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hp1 : pai;
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lastlabel : pasmlabel;
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realait : tait;
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begin
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if (value_real=1.0) then
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begin
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emit_none(A_FLD1,S_NO);
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location.loc:=LOC_FPU;
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inc(fpuvaroffset);
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end
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else if (value_real=0.0) then
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begin
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emit_none(A_FLDZ,S_NO);
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location.loc:=LOC_FPU;
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inc(fpuvaroffset);
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end
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else
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begin
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lastlabel:=nil;
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realait:=floattype2ait[pfloatdef(resulttype)^.typ];
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{ const already used ? }
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if not assigned(lab_real) then
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begin
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{ tries to find an old entry }
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hp1:=pai(consts^.first);
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while assigned(hp1) do
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begin
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if hp1^.typ=ait_label then
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lastlabel:=pai_label(hp1)^.l
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else
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begin
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if (hp1^.typ=realait) and (lastlabel<>nil) then
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begin
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if(
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((realait=ait_real_32bit) and (pai_real_32bit(hp1)^.value=value_real)) or
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((realait=ait_real_64bit) and (pai_real_64bit(hp1)^.value=value_real)) or
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((realait=ait_real_80bit) and (pai_real_80bit(hp1)^.value=value_real)) or
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((realait=ait_comp_64bit) and (pai_comp_64bit(hp1)^.value=value_real))
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) then
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begin
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{ found! }
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lab_real:=lastlabel;
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break;
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end;
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end;
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lastlabel:=nil;
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end;
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hp1:=pai(hp1^.next);
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end;
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{ :-(, we must generate a new entry }
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if not assigned(lab_real) then
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begin
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getdatalabel(lastlabel);
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lab_real:=lastlabel;
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if (cs_create_smart in aktmoduleswitches) then
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consts^.concat(new(pai_cut,init));
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consts^.concat(new(pai_label,init(lastlabel)));
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case realait of
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ait_real_32bit :
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consts^.concat(new(pai_real_32bit,init(value_real)));
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ait_real_64bit :
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consts^.concat(new(pai_real_64bit,init(value_real)));
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ait_real_80bit :
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consts^.concat(new(pai_real_80bit,init(value_real)));
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ait_comp_64bit :
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consts^.concat(new(pai_comp_64bit,init(value_real)));
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else
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internalerror(10120);
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end;
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end;
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end;
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reset_reference(location.reference);
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location.reference.symbol:=lab_real;
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location.loc:=LOC_MEM;
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end;
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end;
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{*****************************************************************************
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TI386FIXCONSTNODE
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*****************************************************************************}
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procedure ti386fixconstnode.pass_2;
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begin
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{ an fix comma const. behaves as a memory reference }
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location.loc:=LOC_MEM;
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location.reference.is_immediate:=true;
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location.reference.offset:=value_fix;
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end;
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{*****************************************************************************
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TI386ORDCONSTNODE
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*****************************************************************************}
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procedure ti386ordconstnode.pass_2;
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var
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l : pasmlabel;
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begin
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location.loc:=LOC_MEM;
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if is_64bitint(resulttype) then
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begin
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getdatalabel(l);
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if (cs_create_smart in aktmoduleswitches) then
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consts^.concat(new(pai_cut,init));
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consts^.concat(new(pai_label,init(l)));
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consts^.concat(new(pai_const,init_32bit(lo(value))));
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consts^.concat(new(pai_const,init_32bit(hi(value))));
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reset_reference(location.reference);
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location.reference.symbol:=l;
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end
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else
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begin
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{ non int64 const. behaves as a memory reference }
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location.reference.is_immediate:=true;
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location.reference.offset:=value;
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end;
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end;
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{*****************************************************************************
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TI386POINTERCONSTNODE
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*****************************************************************************}
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procedure ti386pointerconstnode.pass_2;
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begin
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{ an integer const. behaves as a memory reference }
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location.loc:=LOC_MEM;
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location.reference.is_immediate:=true;
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location.reference.offset:=value;
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end;
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{*****************************************************************************
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Ti386STRINGCONSTNODE
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*****************************************************************************}
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procedure ti386stringconstnode.pass_2;
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var
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hp1 : pai;
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l1,l2,
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lastlabel : pasmlabel;
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pc : pchar;
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same_string : boolean;
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l,j,
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i,mylength : longint;
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begin
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{ for empty ansistrings we could return a constant 0 }
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if is_ansistring(resulttype) and
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(length=0) then
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begin
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location.loc:=LOC_MEM;
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location.reference.is_immediate:=true;
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location.reference.offset:=0;
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exit;
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end;
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{ const already used ? }
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lastlabel:=nil;
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if not assigned(lab_str) then
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begin
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if is_shortstring(resulttype) then
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mylength:=length+2
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else
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mylength:=length+1;
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{ tries to found an old entry }
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hp1:=pai(consts^.first);
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while assigned(hp1) do
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begin
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if hp1^.typ=ait_label then
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lastlabel:=pai_label(hp1)^.l
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else
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begin
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{ when changing that code, be careful that }
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{ you don't use typed consts, which are }
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{ are also written to consts }
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{ currently, this is no problem, because }
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{ typed consts have no leading length or }
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{ they have no trailing zero }
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if (hp1^.typ=ait_string) and (lastlabel<>nil) and
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(pai_string(hp1)^.len=mylength) then
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begin
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same_string:=true;
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{ if shortstring then check the length byte first and
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set the start index to 1 }
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if is_shortstring(resulttype) then
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begin
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if length<>ord(pai_string(hp1)^.str[0]) then
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same_string:=false;
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j:=1;
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end
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else
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j:=0;
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{ don't check if the length byte was already wrong }
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if same_string then
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begin
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for i:=0 to length do
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begin
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if pai_string(hp1)^.str[j]<>value_str[i] then
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begin
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same_string:=false;
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break;
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end;
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inc(j);
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end;
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end;
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{ found ? }
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if same_string then
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begin
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lab_str:=lastlabel;
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{ create a new entry for ansistrings, but reuse the data }
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if (stringtype in [st_ansistring,st_widestring]) then
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begin
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getdatalabel(l2);
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consts^.concat(new(pai_label,init(l2)));
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consts^.concat(new(pai_const_symbol,init(lab_str)));
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{ return the offset of the real string }
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lab_str:=l2;
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end;
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break;
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end;
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end;
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lastlabel:=nil;
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end;
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hp1:=pai(hp1^.next);
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end;
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{ :-(, we must generate a new entry }
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if not assigned(lab_str) then
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begin
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getdatalabel(lastlabel);
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lab_str:=lastlabel;
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if (cs_create_smart in aktmoduleswitches) then
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consts^.concat(new(pai_cut,init));
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consts^.concat(new(pai_label,init(lastlabel)));
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{ generate an ansi string ? }
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case stringtype of
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st_ansistring:
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begin
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{ an empty ansi string is nil! }
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if length=0 then
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consts^.concat(new(pai_const,init_32bit(0)))
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else
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begin
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getdatalabel(l1);
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getdatalabel(l2);
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consts^.concat(new(pai_label,init(l2)));
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consts^.concat(new(pai_const_symbol,init(l1)));
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consts^.concat(new(pai_const,init_32bit(length)));
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consts^.concat(new(pai_const,init_32bit(length)));
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consts^.concat(new(pai_const,init_32bit(-1)));
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consts^.concat(new(pai_label,init(l1)));
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getmem(pc,length+2);
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move(value_str^,pc^,length);
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pc[length]:=#0;
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{ to overcome this problem we set the length explicitly }
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{ with the ending null char }
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consts^.concat(new(pai_string,init_length_pchar(pc,length+1)));
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{ return the offset of the real string }
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lab_str:=l2;
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end;
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end;
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st_shortstring:
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begin
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{ truncate strings larger than 255 chars }
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if length>255 then
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l:=255
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else
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l:=length;
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{ also length and terminating zero }
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getmem(pc,l+3);
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move(value_str^,pc[1],l+1);
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pc[0]:=chr(l);
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{ to overcome this problem we set the length explicitly }
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{ with the ending null char }
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pc[l+1]:=#0;
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consts^.concat(new(pai_string,init_length_pchar(pc,l+2)));
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end;
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end;
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end;
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end;
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reset_reference(location.reference);
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location.reference.symbol:=lab_str;
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location.loc:=LOC_MEM;
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end;
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{*****************************************************************************
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TI386SETCONSTNODE
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*****************************************************************************}
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procedure ti386setconstnode.pass_2;
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var
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hp1 : pai;
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lastlabel : pasmlabel;
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i : longint;
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neededtyp : tait;
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begin
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{ small sets are loaded as constants }
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if psetdef(resulttype)^.settype=smallset then
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begin
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location.loc:=LOC_MEM;
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location.reference.is_immediate:=true;
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location.reference.offset:=plongint(value_set)^;
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exit;
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end;
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if psetdef(resulttype)^.settype=smallset then
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neededtyp:=ait_const_32bit
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else
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neededtyp:=ait_const_8bit;
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lastlabel:=nil;
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{ const already used ? }
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if not assigned(lab_set) then
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begin
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{ tries to found an old entry }
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hp1:=pai(consts^.first);
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while assigned(hp1) do
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begin
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if hp1^.typ=ait_label then
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lastlabel:=pai_label(hp1)^.l
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else
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begin
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if (lastlabel<>nil) and (hp1^.typ=neededtyp) then
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begin
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if (hp1^.typ=ait_const_8bit) then
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begin
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{ compare normal set }
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i:=0;
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while assigned(hp1) and (i<32) do
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begin
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if pai_const(hp1)^.value<>value_set^[i] then
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break;
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inc(i);
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hp1:=pai(hp1^.next);
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end;
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if i=32 then
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begin
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{ found! }
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lab_set:=lastlabel;
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break;
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end;
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{ leave when the end of consts is reached, so no
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hp1^.next is done }
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if not assigned(hp1) then
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break;
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end
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else
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begin
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{ compare small set }
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if plongint(value_set)^=pai_const(hp1)^.value then
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begin
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{ found! }
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lab_set:=lastlabel;
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break;
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end;
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end;
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end;
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lastlabel:=nil;
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end;
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hp1:=pai(hp1^.next);
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end;
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{ :-(, we must generate a new entry }
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if not assigned(lab_set) then
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begin
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getdatalabel(lastlabel);
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lab_set:=lastlabel;
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if (cs_create_smart in aktmoduleswitches) then
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consts^.concat(new(pai_cut,init));
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consts^.concat(new(pai_label,init(lastlabel)));
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if psetdef(resulttype)^.settype=smallset then
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begin
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move(value_set^,i,sizeof(longint));
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consts^.concat(new(pai_const,init_32bit(i)));
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end
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else
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begin
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for i:=0 to 31 do
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consts^.concat(new(pai_const,init_8bit(value_set^[i])));
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end;
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end;
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end;
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reset_reference(location.reference);
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location.reference.symbol:=lab_set;
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location.loc:=LOC_MEM;
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end;
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{*****************************************************************************
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TI386NILNODE
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*****************************************************************************}
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procedure ti386nilnode.pass_2;
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begin
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location.loc:=LOC_MEM;
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location.reference.is_immediate:=true;
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location.reference.offset:=0;
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end;
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begin
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crealconstnode:=ti386realconstnode;
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cfixconstnode:=ti386fixconstnode;
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cordconstnode:=ti386ordconstnode;
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cpointerconstnode:=ti386pointerconstnode;
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cstringconstnode:=ti386stringconstnode;
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csetconstnode:=ti386setconstnode;
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cnilnode:=ti386nilnode;
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end.
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{
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$Log$
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Revision 1.1 2000-09-28 20:48:52 florian
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*** empty log message ***
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} |