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486 lines
18 KiB
ObjectPascal
486 lines
18 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1993-98 by Florian Klaempfl
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This unit handles the codegeneration pass
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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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{$ifdef TP}
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{$E+,F+,N+}
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{$endif}
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unit pass_2;
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interface
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uses
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tree;
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{ produces assembler for the expression in variable p }
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{ and produces an assembler node at the end }
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procedure generatecode(var p : ptree);
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{ produces the actual code }
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function do_secondpass(var p : ptree) : boolean;
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procedure secondpass(var p : ptree);
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implementation
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uses
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cobjects,verbose,comphook,systems,globals,files,
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symtable,types,aasm,scanner,
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pass_1,hcodegen,temp_gen
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{$ifdef GDB}
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,gdb
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{$endif}
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{$ifdef i386}
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,i386,tgeni386,cgai386
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,cg386con,cg386mat,cg386cnv,cg386set,cg386add
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,cg386mem,cg386cal,cg386ld,cg386flw,cg386inl
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{$endif}
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{$ifdef m68k}
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,m68k,tgen68k,cga68k
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,cg68kcon,cg68kmat,cg68kcnv,cg68kset,cg68kadd
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,cg68kmem,cg68kcal,cg68kld,cg68kflw,cg68kinl
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{$endif}
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;
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{*****************************************************************************
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SecondPass
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*****************************************************************************}
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type
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secondpassproc = procedure(var p : ptree);
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procedure secondnothing(var p : ptree);
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begin
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end;
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procedure seconderror(var p : ptree);
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begin
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p^.error:=true;
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codegenerror:=true;
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end;
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procedure secondstatement(var p : ptree);
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var
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hp : ptree;
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begin
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hp:=p;
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while assigned(hp) do
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begin
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if assigned(hp^.right) then
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begin
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cleartempgen;
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secondpass(hp^.right);
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end;
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hp:=hp^.left;
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end;
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end;
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procedure secondblockn(var p : ptree);
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begin
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{ do second pass on left node }
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if assigned(p^.left) then
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secondpass(p^.left);
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end;
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procedure secondasm(var p : ptree);
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begin
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exprasmlist^.concatlist(p^.p_asm);
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if not p^.object_preserved then
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begin
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{$ifdef i386}
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maybe_loadesi;
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{$endif}
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{$ifdef m68k}
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maybe_loada5;
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{$endif}
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end;
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end;
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procedure secondpass(var p : ptree);
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const
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procedures : array[ttreetyp] of secondpassproc =
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(secondadd, {addn}
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secondadd, {muln}
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secondadd, {subn}
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secondmoddiv, {divn}
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secondadd, {symdifn}
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secondmoddiv, {modn}
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secondassignment, {assignn}
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secondload, {loadn}
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secondnothing, {range}
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secondadd, {ltn}
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secondadd, {lten}
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secondadd, {gtn}
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secondadd, {gten}
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secondadd, {equaln}
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secondadd, {unequaln}
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secondin, {inn}
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secondadd, {orn}
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secondadd, {xorn}
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secondshlshr, {shrn}
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secondshlshr, {shln}
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secondadd, {slashn}
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secondadd, {andn}
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secondsubscriptn, {subscriptn}
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secondderef, {derefn}
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secondaddr, {addrn}
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seconddoubleaddr, {doubleaddrn}
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secondordconst, {ordconstn}
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secondtypeconv, {typeconvn}
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secondcalln, {calln}
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secondnothing, {callparan}
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secondrealconst, {realconstn}
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secondfixconst, {fixconstn}
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secondumminus, {umminusn}
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secondasm, {asmn}
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secondvecn, {vecn}
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secondstringconst, {stringconstn}
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secondfuncret, {funcretn}
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secondselfn, {selfn}
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secondnot, {notn}
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secondinline, {inlinen}
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secondniln, {niln}
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seconderror, {errorn}
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secondnothing, {typen}
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secondhnewn, {hnewn}
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secondhdisposen, {hdisposen}
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secondnewn, {newn}
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secondsimplenewdispose, {simpledisposen}
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secondsetelement, {setelementn}
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secondsetconst, {setconstn}
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secondblockn, {blockn}
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secondstatement, {statementn}
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secondnothing, {loopn}
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secondifn, {ifn}
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secondbreakn, {breakn}
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secondcontinuen, {continuen}
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second_while_repeatn, {repeatn}
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second_while_repeatn, {whilen}
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secondfor, {forn}
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secondexitn, {exitn}
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secondwith, {withn}
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secondcase, {casen}
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secondlabel, {labeln}
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secondgoto, {goton}
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secondsimplenewdispose, {simplenewn}
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secondtryexcept, {tryexceptn}
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secondraise, {raisen}
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secondnothing, {switchesn}
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secondtryfinally, {tryfinallyn}
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secondon, {onn}
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secondis, {isn}
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secondas, {asn}
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seconderror, {caretn}
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secondfail, {failn}
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secondadd, {starstarn}
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secondprocinline, {procinlinen}
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secondnothing, {nothingn}
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secondloadvmt {loadvmtn}
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);
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var
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oldcodegenerror : boolean;
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oldlocalswitches : tlocalswitches;
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oldpos : tfileposinfo;
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begin
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if not(p^.error) then
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begin
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oldcodegenerror:=codegenerror;
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oldlocalswitches:=aktlocalswitches;
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oldpos:=aktfilepos;
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aktfilepos:=p^.fileinfo;
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aktlocalswitches:=p^.localswitches;
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codegenerror:=false;
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procedures[p^.treetype](p);
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p^.error:=codegenerror;
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codegenerror:=codegenerror or oldcodegenerror;
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aktlocalswitches:=oldlocalswitches;
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aktfilepos:=oldpos;
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end
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else
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codegenerror:=true;
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end;
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function do_secondpass(var p : ptree) : boolean;
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begin
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codegenerror:=false;
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if not(p^.error) then
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secondpass(p);
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do_secondpass:=codegenerror;
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end;
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var
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regvars : array[1..maxvarregs] of pvarsym;
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regvars_para : array[1..maxvarregs] of boolean;
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regvars_refs : array[1..maxvarregs] of longint;
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parasym : boolean;
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procedure searchregvars(p : psym);
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var
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i,j,k : longint;
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begin
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if (p^.typ=varsym) and ((pvarsym(p)^.var_options and vo_regable)<>0) then
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begin
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{ walk through all momentary register variables }
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for i:=1 to maxvarregs do
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begin
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{ free register ? }
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if regvars[i]=nil then
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begin
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regvars[i]:=pvarsym(p);
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regvars_para[i]:=parasym;
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break;
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end;
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{ else throw out a variable ? }
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j:=pvarsym(p)^.refs;
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{ parameter get a less value }
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if parasym then
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begin
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if cs_littlesize in aktglobalswitches then
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dec(j,1)
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else
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dec(j,100);
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end;
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if (j>regvars_refs[i]) and (j>0) then
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begin
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for k:=maxvarregs-1 downto i do
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begin
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regvars[k+1]:=regvars[k];
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regvars_para[k+1]:=regvars_para[k];
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end;
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{ calc the new refs
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pvarsym(p)^.refs:=j; }
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regvars[i]:=pvarsym(p);
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regvars_para[i]:=parasym;
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regvars_refs[i]:=j;
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break;
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end;
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end;
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end;
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end;
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procedure generatecode(var p : ptree);
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var
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i : longint;
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regsize : topsize;
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regi : tregister;
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hr : preference;
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label
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nextreg;
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begin
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cleartempgen;
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{ when size optimization only count occurrence }
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if cs_littlesize in aktglobalswitches then
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t_times:=1
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else
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{ reference for repetition is 100 }
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t_times:=100;
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{ clear register count }
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clearregistercount;
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use_esp_stackframe:=false;
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if not(do_firstpass(p)) then
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begin
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{ max. optimizations }
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{ only if no asm is used }
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{ and no try statement }
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if (cs_regalloc in aktglobalswitches) and
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((procinfo.flags and (pi_uses_asm or pi_uses_exceptions))=0) then
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begin
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{ can we omit the stack frame ? }
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{ conditions:
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1. procedure (not main block)
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2. no constructor or destructor
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3. no call to other procedures
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4. no interrupt handler
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}
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if assigned(aktprocsym) then
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begin
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if (aktprocsym^.definition^.options and
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(poconstructor+podestructor{+poinline}+pointerrupt)=0) and
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((procinfo.flags and pi_do_call)=0) and (lexlevel>1) then
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begin
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{ use ESP as frame pointer }
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procinfo.framepointer:=stack_pointer;
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use_esp_stackframe:=true;
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{ calc parameter distance new }
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dec(procinfo.framepointer_offset,4);
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dec(procinfo.ESI_offset,4);
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{ is this correct ???}
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{ retoffset can be negativ for results in eax !! }
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{ the value should be decreased only if positive }
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if procinfo.retoffset>=0 then
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dec(procinfo.retoffset,4);
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dec(procinfo.call_offset,4);
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aktprocsym^.definition^.parast^.call_offset:=procinfo.call_offset;
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end;
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end;
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if (p^.registers32<4) then
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begin
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for i:=1 to maxvarregs do
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regvars[i]:=nil;
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parasym:=false;
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{$ifdef tp}
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symtablestack^.foreach(searchregvars);
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{$else}
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symtablestack^.foreach(@searchregvars);
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{$endif}
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{ copy parameter into a register ? }
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parasym:=true;
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{$ifdef tp}
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symtablestack^.next^.foreach(searchregvars);
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{$else}
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symtablestack^.next^.foreach(@searchregvars);
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{$endif}
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{ hold needed registers free }
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for i:=maxvarregs downto maxvarregs-p^.registers32+1 do
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regvars[i]:=nil;
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{ now assign register }
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for i:=1 to maxvarregs-p^.registers32 do
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begin
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if assigned(regvars[i]) then
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begin
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{ it is nonsens, to copy the variable to }
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{ a register because we need then much }
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{ pushes ? }
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if reg_pushes[varregs[i]]>=regvars[i]^.refs then
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begin
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regvars[i]:=nil;
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goto nextreg;
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end;
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{ register is no longer available for }
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{ expressions }
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{ search the register which is the most }
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{ unused }
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usableregs:=usableregs-[varregs[i]];
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is_reg_var[varregs[i]]:=true;
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dec(c_usableregs);
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{ possibly no 32 bit register are needed }
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if (regvars[i]^.definition^.deftype=orddef) and
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(porddef(regvars[i]^.definition)^.typ in [bool8bit,uchar,u8bit,s8bit]) then
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begin
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{$ifdef i386}
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regvars[i]^.reg:=reg32toreg8(varregs[i]);
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{$endif}
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regsize:=S_B;
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end
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else if (regvars[i]^.definition^.deftype=orddef) and
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(porddef(regvars[i]^.definition)^.typ in [bool16bit,u16bit,s16bit]) then
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begin
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{$ifdef i386}
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regvars[i]^.reg:=reg32toreg16(varregs[i]);
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{$endif}
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regsize:=S_W;
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end
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else
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begin
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regvars[i]^.reg:=varregs[i];
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regsize:=S_L;
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end;
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{ parameter must be load }
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if regvars_para[i] then
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begin
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{ procinfo is there actual, }
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{ because we can't never be in a }
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{ nested procedure }
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{ when loading parameter to reg }
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new(hr);
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reset_reference(hr^);
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hr^.offset:=pvarsym(regvars[i])^.address+procinfo.call_offset;
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hr^.base:=procinfo.framepointer;
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{$ifdef i386}
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procinfo.aktentrycode^.concat(new(pai386,op_ref_reg(A_MOV,regsize,
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hr,regvars[i]^.reg)));
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{$endif i386}
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{$ifdef m68k}
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procinfo.aktentrycode^.concat(new(pai68k,op_ref_reg(A_MOVE,regsize,
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hr,regvars[i]^.reg)));
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{$endif m68k}
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unused:=unused - [regvars[i]^.reg];
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end;
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{ procedure uses this register }
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{$ifdef i386}
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usedinproc:=usedinproc or ($80 shr byte(varregs[i]));
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{$endif i386}
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{$ifdef m68k}
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usedinproc:=usedinproc or ($800 shr word(varregs[i]));
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{$endif m68k}
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end;
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nextreg:
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{ dummy }
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regsize:=S_W;
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end;
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if (status.verbosity and v_debug)=v_debug then
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begin
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for i:=1 to maxvarregs do
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begin
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if assigned(regvars[i]) then
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Message3(cg_d_register_weight,reg2str(regvars[i]^.reg),
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tostr(regvars[i]^.refs),regvars[i]^.name);
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end;
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end;
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end;
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end;
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if assigned(aktprocsym) and
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((aktprocsym^.definition^.options and poinline)<>0) then
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make_const_global:=true;
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do_secondpass(p);
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{$ifdef StoreFPULevel}
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procinfo.def^.fpu_used:=p^.registersfpu;
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{$endif StoreFPULevel}
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{ all registers can be used again }
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resetusableregisters;
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end;
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procinfo.aktproccode^.concatlist(exprasmlist);
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make_const_global:=false;
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end;
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end.
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{
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$Log$
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Revision 1.2 1998-09-07 18:46:07 peter
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* update smartlinking, uses getdatalabel
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* renamed ptree.value vars to value_str,value_real,value_set
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Revision 1.1 1998/09/01 09:07:12 peter
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* m68k fixes, splitted cg68k like cgi386
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}
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