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618 lines
27 KiB
ObjectPascal
618 lines
27 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Florian Klaempfl
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Generate assembler for constant nodes which are the same for
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all (most) processors
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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 ncgcon;
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{$i fpcdefs.inc}
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interface
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uses
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node,ncon;
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type
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tcgrealconstnode = class(trealconstnode)
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procedure pass_2;override;
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end;
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tcgordconstnode = class(tordconstnode)
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procedure pass_2;override;
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end;
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tcgpointerconstnode = class(tpointerconstnode)
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procedure pass_2;override;
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end;
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tcgstringconstnode = class(tstringconstnode)
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procedure pass_2;override;
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end;
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tcgsetconstnode = class(tsetconstnode)
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procedure pass_2;override;
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end;
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tcgnilnode = class(tnilnode)
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procedure pass_2;override;
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end;
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tcgguidconstnode = class(tguidconstnode)
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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,widestr,systems,
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verbose,globals,
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symconst,symdef,aasmbase,aasmtai,aasmcpu,defutil,
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cpuinfo,cpubase,
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cgbase,cgobj,cgutils,
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ncgutil
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;
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{*****************************************************************************
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TCGREALCONSTNODE
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*****************************************************************************}
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procedure tcgrealconstnode.pass_2;
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{ I suppose the parser/pass_1 must make sure the generated real }
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{ constants are actually supported by the target processor? (JM) }
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const
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floattype2ait:array[tfloattype] of taitype=
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(ait_real_32bit,ait_real_64bit,ait_real_80bit,ait_comp_64bit,ait_comp_64bit,ait_real_128bit);
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var
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hp1 : tai;
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lastlabel : tasmlabel;
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realait : taitype;
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{$ifdef ARM}
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hiloswapped : boolean;
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{$endif ARM}
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begin
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location_reset(location,LOC_CREFERENCE,def_cgsize(resulttype.def));
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lastlabel:=nil;
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realait:=floattype2ait[tfloatdef(resulttype.def).typ];
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{$ifdef ARM}
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hiloswapped:=aktfputype in [fpu_fpa,fpu_fpa10,fpu_fpa11];
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{$endif ARM}
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{ const already used ? }
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if not assigned(lab_real) then
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begin
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{ tries to find an old entry }
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hp1:=tai(asmlist[al_typedconsts].first);
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while assigned(hp1) do
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begin
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if hp1.typ=ait_label then
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lastlabel:=tai_label(hp1).l
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else
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begin
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if (hp1.typ=realait) and (lastlabel<>nil) then
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begin
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if is_number_float(value_real) and
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(
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((realait=ait_real_32bit) and (tai_real_32bit(hp1).value=value_real) and is_number_float(tai_real_32bit(hp1).value)) or
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((realait=ait_real_64bit) and
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{$ifdef ARM}
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((tai_real_64bit(hp1).formatoptions=fo_hiloswapped)=hiloswapped) and
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{$endif ARM}
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(tai_real_64bit(hp1).value=value_real) and is_number_float(tai_real_64bit(hp1).value)) or
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((realait=ait_real_80bit) and (tai_real_80bit(hp1).value=value_real) and is_number_float(tai_real_80bit(hp1).value)) or
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{$ifdef cpufloat128}
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((realait=ait_real_128bit) and (tai_real_128bit(hp1).value=value_real) and is_number_float(tai_real_128bit(hp1).value)) or
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{$endif cpufloat128}
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((realait=ait_comp_64bit) and (tai_comp_64bit(hp1).value=value_real) and is_number_float(tai_comp_64bit(hp1).value))
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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:=tai(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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objectlibrary.getdatalabel(lastlabel);
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lab_real:=lastlabel;
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maybe_new_object_file(asmlist[al_typedconsts]);
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new_section(asmlist[al_typedconsts],sec_rodata,lastlabel.name,const_align(resulttype.def.size));
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asmlist[al_typedconsts].concat(Tai_label.Create(lastlabel));
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case realait of
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ait_real_32bit :
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begin
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asmlist[al_typedconsts].concat(Tai_real_32bit.Create(ts32real(value_real)));
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{ range checking? }
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if ((cs_check_range in aktlocalswitches) or
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(cs_check_overflow in aktlocalswitches)) and
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(tai_real_32bit(asmlist[al_typedconsts].last).value=double(MathInf)) then
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Message(parser_e_range_check_error);
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end;
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ait_real_64bit :
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begin
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{$ifdef ARM}
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if hiloswapped then
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asmlist[al_typedconsts].concat(Tai_real_64bit.Create_hiloswapped(ts64real(value_real)))
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else
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{$endif ARM}
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asmlist[al_typedconsts].concat(Tai_real_64bit.Create(ts64real(value_real)));
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{ range checking? }
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if ((cs_check_range in aktlocalswitches) or
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(cs_check_overflow in aktlocalswitches)) and
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(tai_real_64bit(asmlist[al_typedconsts].last).value=double(MathInf)) then
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Message(parser_e_range_check_error);
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end;
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ait_real_80bit :
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begin
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asmlist[al_typedconsts].concat(Tai_real_80bit.Create(value_real));
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{ range checking? }
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if ((cs_check_range in aktlocalswitches) or
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(cs_check_overflow in aktlocalswitches)) and
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(tai_real_80bit(asmlist[al_typedconsts].last).value=double(MathInf)) then
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Message(parser_e_range_check_error);
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end;
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{$ifdef cpufloat128}
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ait_real_128bit :
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begin
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asmlist[al_typedconsts].concat(Tai_real_128bit.Create(value_real));
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{ range checking? }
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if ((cs_check_range in aktlocalswitches) or
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(cs_check_overflow in aktlocalswitches)) and
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(tai_real_128bit(asmlist[al_typedconsts].last).value=double(MathInf)) then
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Message(parser_e_range_check_error);
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end;
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{$endif cpufloat128}
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{ the round is necessary for native compilers where comp isn't a float }
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ait_comp_64bit :
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if (value_real>9223372036854775807.0) or (value_real<-9223372036854775808.0) then
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message(parser_e_range_check_error)
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else
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asmlist[al_typedconsts].concat(Tai_comp_64bit.Create(round(value_real)));
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else
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internalerror(10120);
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end;
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end;
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end;
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location.reference.symbol:=lab_real;
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end;
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{*****************************************************************************
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TCGORDCONSTNODE
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*****************************************************************************}
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procedure tcgordconstnode.pass_2;
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begin
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location_reset(location,LOC_CONSTANT,def_cgsize(resulttype.def));
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{$ifdef cpu64bit}
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location.value:=value;
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{$else cpu64bit}
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location.value64:=int64(value);
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{$endif cpu64bit}
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end;
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{*****************************************************************************
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TCGPOINTERCONSTNODE
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*****************************************************************************}
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procedure tcgpointerconstnode.pass_2;
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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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{*****************************************************************************
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TCGSTRINGCONSTNODE
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*****************************************************************************}
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procedure tcgstringconstnode.pass_2;
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var
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hp1,hp2 : tai;
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l1,l2,
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lastlabel : tasmlabel;
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lastlabelhp : tai;
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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 (st_type in [st_ansistring,st_widestring]) and (len=0) then
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begin
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location_reset(location,LOC_CONSTANT,OS_ADDR);
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location.value:=0;
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exit;
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end;
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{ return a constant reference in memory }
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location_reset(location,LOC_CREFERENCE,def_cgsize(resulttype.def));
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{ const already used ? }
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lastlabel:=nil;
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lastlabelhp:=nil;
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if not assigned(lab_str) then
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begin
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if is_shortstring(resulttype.def) then
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mylength:=len+2
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else
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mylength:=len+1;
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{ widestrings can't be reused yet }
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if not(is_widestring(resulttype.def)) then
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begin
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{ tries to find an old entry }
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hp1:=tai(asmlist[al_typedconsts].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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begin
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lastlabel:=tai_label(hp1).l;
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lastlabelhp:=hp1;
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end
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else
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begin
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same_string:=false;
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if (hp1.typ=ait_string) and
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(lastlabel<>nil) and
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(tai_string(hp1).len=mylength) then
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begin
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case st_type of
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st_conststring:
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begin
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j:=0;
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same_string:=true;
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if len>0 then
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begin
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for i:=0 to len-1 do
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begin
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if tai_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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end;
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st_shortstring:
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begin
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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 len=ord(tai_string(hp1).str[0]) then
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begin
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j:=1;
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same_string:=true;
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if len>0 then
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begin
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for i:=0 to len-1 do
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begin
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if tai_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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end;
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end;
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st_ansistring,
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st_widestring :
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begin
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{ before the string the following sequence must be found:
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<label>
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constsymbol <datalabel>
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constint -1
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constint <len>
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we must then return <label> to reuse
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}
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hp2:=tai(lastlabelhp.previous);
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if assigned(hp2) and
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(hp2.typ=ait_const_aint) and
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(tai_const(hp2).value=-1) and
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assigned(hp2.previous) and
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(tai(hp2.previous).typ=ait_const_aint) and
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(tai_const(hp2.previous).value=len) and
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assigned(hp2.previous.previous) and
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(tai(hp2.previous.previous).typ=ait_const_ptr) and
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assigned(hp2.previous.previous.previous) and
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(tai(hp2.previous.previous.previous).typ=ait_label) then
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begin
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lastlabel:=tai_label(hp2.previous.previous.previous).l;
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same_string:=true;
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j:=0;
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if len>0 then
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begin
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for i:=0 to len-1 do
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begin
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if tai_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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end;
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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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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:=tai(hp1.next);
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end;
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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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objectlibrary.getdatalabel(lastlabel);
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lab_str:=lastlabel;
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maybe_new_object_file(asmlist[al_typedconsts]);
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new_section(asmlist[al_typedconsts],sec_rodata,lastlabel.name,const_align(sizeof(aint)));
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asmlist[al_typedconsts].concat(Tai_label.Create(lastlabel));
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{ generate an ansi string ? }
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case st_type 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 len=0 then
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asmlist[al_typedconsts].concat(Tai_const.Create_sym(nil))
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else
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begin
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objectlibrary.getdatalabel(l1);
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objectlibrary.getdatalabel(l2);
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asmlist[al_typedconsts].concat(Tai_label.Create(l2));
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asmlist[al_typedconsts].concat(Tai_const.Create_sym(l1));
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asmlist[al_typedconsts].concat(Tai_const.Create_aint(-1));
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asmlist[al_typedconsts].concat(Tai_const.Create_aint(len));
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asmlist[al_typedconsts].concat(Tai_label.Create(l1));
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{ include also terminating zero }
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getmem(pc,len+1);
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move(value_str^,pc^,len);
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pc[len]:=#0;
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asmlist[al_typedconsts].concat(Tai_string.Create_pchar(pc,len+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_widestring:
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begin
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{ an empty wide string is nil! }
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if len=0 then
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asmlist[al_typedconsts].concat(Tai_const.Create_sym(nil))
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else
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begin
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objectlibrary.getdatalabel(l1);
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objectlibrary.getdatalabel(l2);
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asmlist[al_typedconsts].concat(Tai_label.Create(l2));
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asmlist[al_typedconsts].concat(Tai_const.Create_sym(l1));
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{ we use always UTF-16 coding for constants }
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{ at least for now }
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{ Consts.concat(Tai_const.Create_8bit(2)); }
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asmlist[al_typedconsts].concat(Tai_const.Create_aint(-1));
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asmlist[al_typedconsts].concat(Tai_const.Create_aint(len));
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asmlist[al_typedconsts].concat(Tai_label.Create(l1));
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for i:=0 to len-1 do
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asmlist[al_typedconsts].concat(Tai_const.Create_16bit(pcompilerwidestring(value_str)^.data[i]));
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{ terminating zero }
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asmlist[al_typedconsts].concat(Tai_const.Create_16bit(0));
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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 len>255 then
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l:=255
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else
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l:=len;
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{ include length and terminating zero for quick conversion to pchar }
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getmem(pc,l+2);
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move(value_str^,pc[1],l);
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pc[0]:=chr(l);
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pc[l+1]:=#0;
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asmlist[al_typedconsts].concat(Tai_string.Create_pchar(pc,l+2));
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end;
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st_conststring:
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begin
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{ include terminating zero }
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getmem(pc,len+1);
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move(value_str^,pc[0],len);
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pc[len]:=#0;
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asmlist[al_typedconsts].concat(Tai_string.Create_pchar(pc,len+1));
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end;
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end;
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end;
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end;
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location.reference.symbol:=lab_str;
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end;
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{*****************************************************************************
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TCGSETCONSTNODE
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*****************************************************************************}
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procedure tcgsetconstnode.pass_2;
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var
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hp1 : tai;
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lastlabel : tasmlabel;
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i : longint;
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neededtyp : taitype;
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indexadjust : longint;
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type
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setbytes=array[0..31] of byte;
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Psetbytes=^setbytes;
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begin
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{ xor indexadjust with indexes in a set typecasted to an array of }
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{ bytes to get the correct locations, also when endianess of source }
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{ and destiantion differs (JM) }
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if (source_info.endian = target_info.endian) then
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indexadjust := 0
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else
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indexadjust := 3;
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{ small sets are loaded as constants }
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if tsetdef(resulttype.def).settype=smallset then
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begin
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location_reset(location,LOC_CONSTANT,OS_32);
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location.value:=pLongint(value_set)^;
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exit;
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end;
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location_reset(location,LOC_CREFERENCE,OS_NO);
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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:=tai(asmlist[al_typedconsts].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:=tai_label(hp1).l
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else
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begin
|
|
if (lastlabel<>nil) and (hp1.typ=neededtyp) then
|
|
begin
|
|
if (hp1.typ=ait_const_8bit) then
|
|
begin
|
|
{ compare normal set }
|
|
i:=0;
|
|
while assigned(hp1) and (i<32) do
|
|
begin
|
|
if tai_const(hp1).value<>Psetbytes(value_set)^[i xor indexadjust] then
|
|
break;
|
|
inc(i);
|
|
hp1:=tai(hp1.next);
|
|
end;
|
|
if i=32 then
|
|
begin
|
|
{ found! }
|
|
lab_set:=lastlabel;
|
|
break;
|
|
end;
|
|
{ leave when the end of consts is reached, so no
|
|
hp1.next is done }
|
|
if not assigned(hp1) then
|
|
break;
|
|
end
|
|
else
|
|
begin
|
|
{ compare small set }
|
|
if paint(value_set)^=tai_const(hp1).value then
|
|
begin
|
|
{ found! }
|
|
lab_set:=lastlabel;
|
|
break;
|
|
end;
|
|
end;
|
|
end;
|
|
lastlabel:=nil;
|
|
end;
|
|
hp1:=tai(hp1.next);
|
|
end;
|
|
{ :-(, we must generate a new entry }
|
|
if not assigned(lab_set) then
|
|
begin
|
|
objectlibrary.getdatalabel(lastlabel);
|
|
lab_set:=lastlabel;
|
|
maybe_new_object_file(asmlist[al_typedconsts]);
|
|
new_section(asmlist[al_typedconsts],sec_rodata,lastlabel.name,const_align(sizeof(aint)));
|
|
asmlist[al_typedconsts].concat(Tai_label.Create(lastlabel));
|
|
{ already handled at the start of this method?? (JM)
|
|
if tsetdef(resulttype.def).settype=smallset then
|
|
begin
|
|
move(value_set^,i,sizeof(longint));
|
|
Consts.concat(Tai_const.Create_32bit(i));
|
|
end
|
|
else
|
|
}
|
|
begin
|
|
for i:=0 to 31 do
|
|
asmlist[al_typedconsts].concat(Tai_const.Create_8bit(Psetbytes(value_set)^[i xor indexadjust]));
|
|
end;
|
|
end;
|
|
end;
|
|
location.reference.symbol:=lab_set;
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
TCGNILNODE
|
|
*****************************************************************************}
|
|
|
|
procedure tcgnilnode.pass_2;
|
|
begin
|
|
location_reset(location,LOC_CONSTANT,OS_ADDR);
|
|
location.value:=0;
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
TCGPOINTERCONSTNODE
|
|
*****************************************************************************}
|
|
|
|
procedure tcgguidconstnode.pass_2;
|
|
var
|
|
tmplabel : TAsmLabel;
|
|
i : integer;
|
|
begin
|
|
location_reset(location,LOC_CREFERENCE,OS_NO);
|
|
{ label for GUID }
|
|
objectlibrary.getdatalabel(tmplabel);
|
|
asmlist[al_typedconsts].concat(tai_align.create(const_align(16)));
|
|
asmlist[al_typedconsts].concat(Tai_label.Create(tmplabel));
|
|
asmlist[al_typedconsts].concat(Tai_const.Create_32bit(longint(value.D1)));
|
|
asmlist[al_typedconsts].concat(Tai_const.Create_16bit(value.D2));
|
|
asmlist[al_typedconsts].concat(Tai_const.Create_16bit(value.D3));
|
|
for i:=low(value.D4) to high(value.D4) do
|
|
asmlist[al_typedconsts].concat(Tai_const.Create_8bit(value.D4[i]));
|
|
location.reference.symbol:=tmplabel;
|
|
end;
|
|
|
|
|
|
begin
|
|
crealconstnode:=tcgrealconstnode;
|
|
cordconstnode:=tcgordconstnode;
|
|
cpointerconstnode:=tcgpointerconstnode;
|
|
cstringconstnode:=tcgstringconstnode;
|
|
csetconstnode:=tcgsetconstnode;
|
|
cnilnode:=tcgnilnode;
|
|
cguidconstnode:=tcgguidconstnode;
|
|
end.
|