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729 lines
22 KiB
ObjectPascal
729 lines
22 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2000 by Florian Klaempfl
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This unit implements the base object for temp. generator
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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 tgobj;
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interface
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uses
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cpubase,
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cpuinfo,
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cpuasm,
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tainst,
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cobjects,globals,tree,cgbase,verbose,files,aasm;
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type
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tregisterset = set of tregister;
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tpushed = array[firstreg..lastreg] of boolean;
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tsaved = array[firstreg..lastreg] of longint;
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ttemptype = (tt_none,tt_free,tt_normal,tt_persistant,tt_ansistring,tt_freeansistring,tt_widestring,tt_freewidestring);
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ttemptypeset = set of ttemptype;
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ptemprecord = ^ttemprecord;
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ttemprecord = record
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temptype : ttemptype;
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pos : longint;
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size : longint;
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next : ptemprecord;
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nextfree : ptemprecord; { for faster freeblock checking }
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{$ifdef EXTDEBUG}
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posinfo,
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releaseposinfo : tfileposinfo;
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{$endif}
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end;
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ttgobj = object
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unusedregsint,availabletempregsint : tregisterset;
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unusedregsfpu,availabletempregsfpu : tregisterset;
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unusedregsmm,availabletempregsmm : tregisterset;
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countusableregsint,
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countusableregsfpu,
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countusableregsmm : byte;
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c_countusableregsint,
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c_countusableregsfpu,
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c_countusableregsmm : byte;
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usedinproc : tregisterset;
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reg_pushes : array[firstreg..lastreg] of longint;
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is_reg_var : array[firstreg..lastreg] of boolean;
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{ contains all temps }
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templist : ptemprecord;
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{ contains all free temps using nextfree links }
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tempfreelist : ptemprecord;
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{ Offsets of the first/last temp }
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firsttemp,
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lasttemp : longint;
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constructor init;
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{ generates temporary variables }
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procedure resettempgen;
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procedure setfirsttemp(l : longint);
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function gettempsize : longint;
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function newtempofsize(size : longint) : longint;
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function gettempofsize(size : longint) : longint;
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{ special call for inlined procedures }
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function gettempofsizepersistant(size : longint) : longint;
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{ for parameter func returns }
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procedure normaltemptopersistant(pos : longint);
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procedure persistanttemptonormal(pos : longint);
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procedure ungetpersistanttemp(pos : longint);
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procedure gettempofsizereference(l : longint;var ref : treference);
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function istemp(const ref : treference) : boolean;virtual;
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procedure ungetiftemp(const ref : treference);
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function ungetiftempansi(const ref : treference) : boolean;
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function gettempansistringreference(var ref : treference):boolean;
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{ the following methods must be overriden }
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function getregisterint : tregister;virtual;
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procedure ungetregisterint(r : tregister);virtual;
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{ tries to allocate the passed register, if possible }
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function getexplicitregisterint(r : tregister) : tregister;virtual;
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procedure ungetregister(r : tregister);virtual;
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procedure cleartempgen;virtual;
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procedure del_reference(const ref : treference);virtual;
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procedure del_locref(const location : tlocation);virtual;
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procedure del_location(const l : tlocation);virtual;
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{ pushs and restores registers }
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procedure pushusedregisters(var pushed : tpushed;b : byte);virtual;
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procedure popusedregisters(const pushed : tpushed);virtual;
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{ saves and restores used registers to temp. values }
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procedure saveusedregisters(var saved : tsaved;b : byte);virtual;
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procedure restoreusedregisters(const saved : tsaved);virtual;
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procedure clearregistercount;virtual;
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procedure resetusableregisters;virtual;
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private
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function ungettemp(pos:longint;allowtype:ttemptype):ttemptype;
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end;
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implementation
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uses
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scanner,systems;
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constructor ttgobj.init;
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begin
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tempfreelist:=nil;
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templist:=nil;
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end;
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procedure ttgobj.resettempgen;
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var
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hp : ptemprecord;
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begin
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{ Clear the old templist }
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while assigned(templist) do
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begin
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{$ifdef EXTDEBUG}
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case templist^.temptype of
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tt_normal,
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tt_persistant :
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Comment(V_Warning,'temporary assignment of size '+
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tostr(templist^.size)+' from pos '+tostr(templist^.posinfo.line)+
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':'+tostr(templist^.posinfo.column)+
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' at pos '+tostr(templist^.pos)+
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' not freed at the end of the procedure');
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tt_ansistring :
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Comment(V_Warning,'temporary ANSI assignment of size '+
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tostr(templist^.size)+' from pos '+tostr(templist^.posinfo.line)+
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':'+tostr(templist^.posinfo.column)+
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' at pos '+tostr(templist^.pos)+
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' not freed at the end of the procedure');
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end;
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{$endif}
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hp:=templist;
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templist:=hp^.next;
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dispose(hp);
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end;
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templist:=nil;
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tempfreelist:=nil;
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firsttemp:=0;
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lasttemp:=0;
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end;
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procedure ttgobj.setfirsttemp(l : longint);
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begin
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{ this is a negative value normally }
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if l < 0 then
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Begin
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if odd(l) then
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Dec(l);
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end
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else
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Begin
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if odd(l) then
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Inc(l);
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end;
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firsttemp:=l;
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lasttemp:=l;
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end;
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function ttgobj.newtempofsize(size : longint) : longint;
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var
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tl : ptemprecord;
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begin
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{ Just extend the temp, everything below has been use
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already }
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dec(lasttemp,size);
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{ now we can create the templist entry }
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new(tl);
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tl^.temptype:=tt_normal;
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tl^.pos:=lasttemp;
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tl^.size:=size;
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tl^.next:=templist;
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tl^.nextfree:=nil;
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templist:=tl;
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newtempofsize:=tl^.pos;
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end;
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function ttgobj.gettempofsize(size : longint) : longint;
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var
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tl,
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bestslot,bestprev,
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hprev,hp : ptemprecord;
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bestsize,ofs : longint;
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begin
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bestprev:=nil;
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bestslot:=nil;
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tl:=nil;
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bestsize:=0;
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{ Align needed size on 4 bytes }
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if (size mod 4)<>0 then
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size:=size+(4-(size mod 4));
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{ First check the tmpfreelist }
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if assigned(tempfreelist) then
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begin
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{ Check for a slot with the same size first }
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hprev:=nil;
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hp:=tempfreelist;
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while assigned(hp) do
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begin
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{$ifdef EXTDEBUG}
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if hp^.temptype<>tt_free then
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Comment(V_Warning,'Temp in freelist is not set to tt_free');
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{$endif}
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if hp^.size>=size then
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begin
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{ Slot is the same size, then leave immediatly }
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if hp^.size=size then
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begin
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bestprev:=hprev;
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bestslot:=hp;
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bestsize:=size;
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break;
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end
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else
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begin
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if (bestsize=0) or (hp^.size<bestsize) then
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begin
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bestprev:=hprev;
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bestslot:=hp;
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bestsize:=hp^.size;
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end;
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end;
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end;
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hprev:=hp;
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hp:=hp^.nextfree;
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end;
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end;
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{ Reuse an old temp ? }
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if assigned(bestslot) then
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begin
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if bestsize=size then
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begin
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bestslot^.temptype:=tt_normal;
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ofs:=bestslot^.pos;
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tl:=bestslot;
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{ Remove from the tempfreelist }
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if assigned(bestprev) then
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bestprev^.nextfree:=bestslot^.nextfree
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else
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tempfreelist:=bestslot^.nextfree;
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end
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else
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begin
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{ Resize the old block }
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dec(bestslot^.size,size);
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{ Create new block and link after bestslot }
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new(tl);
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tl^.temptype:=tt_normal;
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tl^.pos:=bestslot^.pos+bestslot^.size;
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ofs:=tl^.pos;
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tl^.size:=size;
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tl^.nextfree:=nil;
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{ link the new block }
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tl^.next:=bestslot^.next;
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bestslot^.next:=tl;
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end;
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end
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else
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begin
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ofs:=newtempofsize(size);
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{$ifdef EXTDEBUG}
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tl:=templist;
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{$endif}
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end;
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{$ifdef EXTDEBUG}
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tl^.posinfo:=aktfilepos;
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{$endif}
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exprasmlist^.concat(new(paitempalloc,alloc(ofs,size)));
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gettempofsize:=ofs;
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end;
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function ttgobj.gettempofsizepersistant(size : longint) : longint;
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var
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l : longint;
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begin
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l:=gettempofsize(size);
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templist^.temptype:=tt_persistant;
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{$ifdef EXTDEBUG}
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Comment(V_Debug,'temp managment : call to gettempofsizepersistant()'+
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' with size '+tostr(size)+' returned '+tostr(l));
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{$endif}
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gettempofsizepersistant:=l;
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end;
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function ttgobj.gettempsize : longint;
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begin
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gettempsize:=Align(-lasttemp,target_os.stackalignment);
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end;
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procedure ttgobj.gettempofsizereference(l : longint;var ref : treference);
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begin
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{ do a reset, because the reference isn't used }
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reset_reference(ref);
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ref.offset:=gettempofsize(l);
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ref.base:=procinfo^.framepointer;
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end;
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function ttgobj.gettempansistringreference(var ref : treference):boolean;
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var
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foundslot,tl : ptemprecord;
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begin
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{ do a reset, because the reference isn't used }
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reset_reference(ref);
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ref.base:=procinfo^.framepointer;
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{ Reuse old ansi slot ? }
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foundslot:=nil;
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tl:=templist;
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while assigned(tl) do
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begin
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if tl^.temptype=tt_freeansistring then
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begin
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foundslot:=tl;
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{$ifdef EXTDEBUG}
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tl^.posinfo:=aktfilepos;
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{$endif}
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break;
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end;
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tl:=tl^.next;
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end;
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if assigned(foundslot) then
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begin
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foundslot^.temptype:=tt_ansistring;
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ref.offset:=foundslot^.pos;
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{ we're reusing an old slot then set the function result to true
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so that we can call a decr_ansistr }
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gettempansistringreference:=true;
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end
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else
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begin
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ref.offset:=newtempofsize(target_os.size_of_pointer);
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{$ifdef EXTDEBUG}
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templist^.posinfo:=aktfilepos;
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{$endif}
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templist^.temptype:=tt_ansistring;
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{ set result to false, we don't need an decr_ansistr }
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gettempansistringreference:=true;
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end;
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exprasmlist^.concat(new(paitempalloc,alloc(ref.offset,target_os.size_of_pointer)));
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end;
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function ttgobj.ungetiftempansi(const ref : treference) : boolean;
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var
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tl : ptemprecord;
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begin
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ungetiftempansi:=false;
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tl:=templist;
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while assigned(tl) do
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begin
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if tl^.pos=ref.offset then
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begin
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if tl^.temptype=tt_ansistring then
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begin
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tl^.temptype:=tt_freeansistring;
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ungetiftempansi:=true;
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exprasmlist^.concat(new(paitempalloc,dealloc(tl^.pos,tl^.size)));
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exit;
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{$ifdef EXTDEBUG}
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end
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else if (tl^.temptype=tt_freeansistring) then
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begin
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Comment(V_Debug,'temp ansi managment problem : ungetiftempansi()'+
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' at pos '+tostr(ref.offset)+ ' already free !');
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{$endif}
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end;
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end;
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tl:=tl^.next;
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end;
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end;
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function ttgobj.istemp(const ref : treference) : boolean;
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begin
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istemp:=((ref.base=procinfo^.framepointer) and
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(ref.offset<firsttemp));
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end;
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procedure ttgobj.persistanttemptonormal(pos : longint);
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var
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hp : ptemprecord;
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begin
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hp:=templist;
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while assigned(hp) do
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if (hp^.pos=pos) and (hp^.temptype=tt_persistant) then
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begin
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{$ifdef EXTDEBUG}
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Comment(V_Debug,'temp managment : persistanttemptonormal()'+
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' at pos '+tostr(pos)+ ' found !');
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{$endif}
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hp^.temptype:=tt_normal;
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exit;
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end
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else
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hp:=hp^.next;
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{$ifdef EXTDEBUG}
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Comment(V_Debug,'temp managment problem : persistanttemptonormal()'+
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' at pos '+tostr(pos)+ ' not found !');
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{$endif}
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end;
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procedure ttgobj.normaltemptopersistant(pos : longint);
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var
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hp : ptemprecord;
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begin
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hp:=templist;
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while assigned(hp) do
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if (hp^.pos=pos) and (hp^.temptype=tt_normal) then
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begin
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{$ifdef EXTDEBUG}
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Comment(V_Debug,'temp managment : normaltemptopersistant()'+
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' at pos '+tostr(pos)+ ' found !');
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{$endif}
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hp^.temptype:=tt_persistant;
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exit;
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end
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else
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hp:=hp^.next;
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{$ifdef EXTDEBUG}
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Comment(V_Debug,'temp managment problem : normaltemptopersistant()'+
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' at pos '+tostr(pos)+ ' not found !');
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{$endif}
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end;
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function ttgobj.ungettemp(pos:longint;allowtype:ttemptype):ttemptype;
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var
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hp,hnext,hprev,hprevfree : ptemprecord;
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begin
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ungettemp:=tt_none;
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hp:=templist;
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hprev:=nil;
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hprevfree:=nil;
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while assigned(hp) do
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begin
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if (hp^.pos=pos) then
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begin
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{ check type }
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ungettemp:=hp^.temptype;
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if hp^.temptype<>allowtype then
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begin
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exit;
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end;
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exprasmlist^.concat(new(paitempalloc,dealloc(hp^.pos,hp^.size)));
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{ set this block to free }
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hp^.temptype:=tt_free;
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{ Update tempfreelist }
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if assigned(hprevfree) then
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begin
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{ Connect with previous? }
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if assigned(hprev) and (hprev^.temptype=tt_free) then
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begin
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inc(hprev^.size,hp^.size);
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hprev^.next:=hp^.next;
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dispose(hp);
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hp:=hprev;
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end
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else
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hprevfree^.nextfree:=hp;
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end
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else
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begin
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hp^.nextfree:=tempfreelist;
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tempfreelist:=hp;
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end;
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{ Next block free ? Yes, then concat }
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hnext:=hp^.next;
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if assigned(hnext) and (hnext^.temptype=tt_free) then
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begin
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inc(hp^.size,hnext^.size);
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hp^.nextfree:=hnext^.nextfree;
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hp^.next:=hnext^.next;
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dispose(hnext);
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end;
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exit;
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end;
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if (hp^.temptype=tt_free) then
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hprevfree:=hp;
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hprev:=hp;
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hp:=hp^.next;
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end;
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ungettemp:=tt_none;
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end;
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procedure ttgobj.ungetpersistanttemp(pos : longint);
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begin
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{$ifdef EXTDEBUG}
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if ungettemp(pos,tt_persistant)<>tt_persistant then
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Comment(V_Warning,'temp managment problem : ungetpersistanttemp()'+
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' at pos '+tostr(pos)+ ' not found !');
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{$else}
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ungettemp(pos,tt_persistant);
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{$endif}
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end;
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procedure ttgobj.ungetiftemp(const ref : treference);
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var
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tt : ttemptype;
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begin
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if istemp(ref) then
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begin
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{ first check if ansistring }
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if ungetiftempansi(ref) then
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exit;
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tt:=ungettemp(ref.offset,tt_normal);
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{$ifdef EXTDEBUG}
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if tt=tt_persistant then
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Comment(V_Debug,'temp at pos '+tostr(ref.offset)+ ' not released because persistant!');
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if tt=tt_none then
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Comment(V_Warning,'temp not found for release at offset '+tostr(ref.offset));
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{$endif}
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end;
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end;
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function ttgobj.getregisterint : tregister;
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var
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i : tregister;
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|
|
|
begin
|
|
if countusableregsint=0 then
|
|
internalerror(10);
|
|
for i:=firstreg to lastreg do
|
|
begin
|
|
if i in unusedregsint then
|
|
begin
|
|
exclude(unusedregsint,i);
|
|
include(usedinproc,i);
|
|
dec(countusableregsint);
|
|
exprasmlist^.concat(new(pairegalloc,alloc(i)));
|
|
exit;
|
|
end;
|
|
end;
|
|
internalerror(28991);
|
|
end;
|
|
|
|
procedure ttgobj.ungetregisterint(r : tregister);
|
|
|
|
begin
|
|
{ takes much time }
|
|
if not(r in availabletempregsint) then
|
|
exit;
|
|
include(unusedregsint,r);
|
|
inc(countusableregsint);
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(r)));
|
|
end;
|
|
|
|
{ tries to allocate the passed register, if possible }
|
|
function ttgobj.getexplicitregisterint(r : tregister) : tregister;
|
|
|
|
begin
|
|
if r in unusedregsint then
|
|
begin
|
|
dec(countusableregsint);
|
|
exclude(unusedregsint,r);
|
|
include(usedinproc,r);
|
|
exprasmlist^.concat(new(pairegalloc,alloc(r)));
|
|
getexplicitregisterint:=r;
|
|
end
|
|
else
|
|
getexplicitregisterint:=getregisterint;
|
|
end;
|
|
|
|
procedure ttgobj.ungetregister(r : tregister);
|
|
|
|
begin
|
|
if r in intregs then
|
|
ungetregisterint(r)
|
|
{!!!!!!!!
|
|
else if r in fpuregs then
|
|
ungetregisterfpu(r)
|
|
else if r in mmregs then
|
|
ungetregistermm(r)
|
|
}
|
|
else internalerror(18);
|
|
end;
|
|
|
|
procedure ttgobj.cleartempgen;
|
|
|
|
begin
|
|
countusableregsint:=c_countusableregsint;
|
|
countusableregsfpu:=c_countusableregsfpu;
|
|
countusableregsmm:=c_countusableregsmm;
|
|
unusedregsint:=availabletempregsint;
|
|
{!!!!!!!!
|
|
unusedregsfpu:=availabletempregsfpu;
|
|
unusedregsmm:=availabletempregsmm;
|
|
}
|
|
end;
|
|
|
|
procedure ttgobj.del_reference(const ref : treference);
|
|
|
|
begin
|
|
ungetregister(ref.base);
|
|
end;
|
|
|
|
procedure ttgobj.del_locref(const location : tlocation);
|
|
|
|
begin
|
|
if (location.loc<>LOC_MEM) and (location.loc<>LOC_REFERENCE) then
|
|
exit;
|
|
del_reference(location.reference);
|
|
end;
|
|
|
|
procedure ttgobj.del_location(const l : tlocation);
|
|
|
|
begin
|
|
case l.loc of
|
|
LOC_REGISTER :
|
|
ungetregister(l.register);
|
|
LOC_MEM,LOC_REFERENCE :
|
|
del_reference(l.reference);
|
|
end;
|
|
end;
|
|
|
|
{ pushs and restores registers }
|
|
procedure ttgobj.pushusedregisters(var pushed : tpushed;b : byte);
|
|
|
|
begin
|
|
runerror(255);
|
|
end;
|
|
|
|
procedure ttgobj.popusedregisters(const pushed : tpushed);
|
|
|
|
begin
|
|
runerror(255);
|
|
end;
|
|
|
|
{ saves and restores used registers to temp. values }
|
|
procedure ttgobj.saveusedregisters(var saved : tsaved;b : byte);
|
|
|
|
begin
|
|
runerror(255);
|
|
end;
|
|
|
|
procedure ttgobj.restoreusedregisters(const saved : tsaved);
|
|
|
|
begin
|
|
runerror(255);
|
|
end;
|
|
|
|
procedure ttgobj.clearregistercount;
|
|
|
|
begin
|
|
runerror(255);
|
|
end;
|
|
|
|
procedure ttgobj.resetusableregisters;
|
|
|
|
begin
|
|
runerror(255);
|
|
end;
|
|
|
|
end.
|
|
{
|
|
$Log$
|
|
Revision 1.1 2000-07-13 06:30:09 michael
|
|
+ Initial import
|
|
|
|
Revision 1.10 2000/02/17 14:48:36 florian
|
|
* updated to use old firstpass
|
|
|
|
Revision 1.9 2000/01/07 01:14:55 peter
|
|
* updated copyright to 2000
|
|
|
|
Revision 1.8 1999/10/14 14:57:54 florian
|
|
- removed the hcodegen use in the new cg, use cgbase instead
|
|
|
|
Revision 1.7 1999/10/12 21:20:47 florian
|
|
* new codegenerator compiles again
|
|
|
|
Revision 1.6 1999/09/10 18:48:11 florian
|
|
* some bug fixes (e.g. must_be_valid and procinfo.funcret_is_valid)
|
|
* most things for stored properties fixed
|
|
|
|
Revision 1.5 1999/08/06 16:04:06 michael
|
|
+ introduced tainstruction
|
|
|
|
Revision 1.4 1999/08/03 00:33:23 michael
|
|
+ Added cpuasm for alpha
|
|
|
|
Revision 1.3 1999/08/03 00:32:13 florian
|
|
* reg_vars and reg_pushes is now in tgobj
|
|
|
|
Revision 1.2 1999/08/02 23:13:22 florian
|
|
* more changes to compile for the Alpha
|
|
|
|
Revision 1.1 1999/08/02 17:14:12 florian
|
|
+ changed the temp. generator to an object
|
|
|
|
} |