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468 lines
14 KiB
ObjectPascal
468 lines
14 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 temporary variables stuff for i386
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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 temp_gen;
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interface
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uses
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{$ifdef i386}
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i386,
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{$endif i386}
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{$ifdef m68k}
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m68k,
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{$endif m68k}
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cobjects,globals,tree,hcodegen,verbose,files,aasm;
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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 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 persistanttemptonormal(pos : longint);
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procedure ungettemp(pos : longint;size : longint);
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procedure ungetpersistanttemp(pos : longint;size : longint);
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procedure gettempofsizereference(l : longint;var ref : treference);
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function istemp(const ref : treference) : boolean;
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procedure ungetiftemp(const ref : treference);
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implementation
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{$ifdef EXTDEBUG}
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uses scanner;
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{$endif}
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type
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pfreerecord = ^tfreerecord;
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tfreerecord = record
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next : pfreerecord;
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pos : longint;
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size : longint;
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persistant : boolean; { used for inlined procedures }
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{$ifdef EXTDEBUG}
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line : longint;
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{$endif}
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end;
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var
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tmpfreelist : pfreerecord;
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templist : pfreerecord;
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lastoccupied : longint;
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firsttemp, maxtemp : longint;
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procedure resettempgen;
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var
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hp : pfreerecord;
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begin
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while assigned(tmpfreelist) do
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begin
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hp:=tmpfreelist;
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tmpfreelist:=hp^.next;
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dispose(hp);
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end;
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while assigned(templist) do
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begin
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{$ifdef EXTDEBUG}
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Comment(V_Warning,'temporary assignment of size '
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+tostr(templist^.size)+' from line '+tostr(templist^.line)+
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+' at pos '+tostr(templist^.pos)+
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' not freed at the end of the procedure');
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{$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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tmpfreelist:=nil;
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firsttemp:=0;
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maxtemp:=0;
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lastoccupied:=0;
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end;
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procedure 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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maxtemp:=l;
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lastoccupied:=l;
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end;
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function gettempofsize(size : longint) : longint;
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var
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tl,last,hp : pfreerecord;
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ofs : longint;
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begin
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{ this code comes from the heap management of FPC ... }
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if (size mod 4)<>0 then
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size:=size+(4-(size mod 4));
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ofs:=0;
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if assigned(tmpfreelist) then
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begin
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last:=nil;
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hp:=tmpfreelist;
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while assigned(hp) do
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begin
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{ first fit }
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if hp^.size>=size then
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begin
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ofs:=hp^.pos;
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if hp^.pos-size < maxtemp then
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maxtemp := hp^.size-size;
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{ the whole block is needed ? }
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if hp^.size>size then
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begin
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hp^.size:=hp^.size-size;
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hp^.pos:=hp^.pos-size;
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end
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else
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begin
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if assigned(last) then
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last^.next:=hp^.next
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else
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tmpfreelist:=nil;
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dispose(hp);
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end;
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break;
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end;
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last:=hp;
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hp:=hp^.next;
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end;
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end;
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{ nothing free is big enough : expand temp }
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if ofs=0 then
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begin
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ofs:=lastoccupied-size;
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lastoccupied:=lastoccupied-size;
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if lastoccupied < maxtemp then
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maxtemp := lastoccupied;
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end;
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new(tl);
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tl^.pos:=ofs;
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tl^.size:=size;
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tl^.next:=templist;
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tl^.persistant:=false;
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templist:=tl;
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{$ifdef EXTDEBUG}
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tl^.line:=aktfilepos.line;
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{$endif}
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gettempofsize:=ofs;
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end;
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function 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^.persistant:=true;
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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 gettempsize : longint;
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begin
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{$ifdef i386}
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{ align local data to dwords }
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if (maxtemp mod 4)<>0 then
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dec(maxtemp,4+(maxtemp mod 4));
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{$endif}
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{$ifdef m68k}
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{ we only push words and we want to stay on }
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{ even stack addresses }
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{ maxtemp is negative }
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if (maxtemp mod 2)<>0 then
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dec(maxtemp);
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{$endif}
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gettempsize:=-maxtemp;
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end;
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procedure 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 istemp(const ref : treference) : boolean;
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begin
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{ ref.index = R_NO was missing
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led to problems with local arrays
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with lower bound > 0 (PM) }
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istemp:=((ref.base=procinfo.framepointer) and
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(ref.offset<firsttemp) and (ref.index=R_NO));
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end;
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procedure persistanttemptonormal(pos : longint);
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var hp : pfreerecord;
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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^.persistant) and (hp^.pos=pos) 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^.persistant:=false;
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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 ungetpersistanttemp(pos : longint;size : longint);
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var
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prev,hp : pfreerecord;
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begin
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ungettemp(pos,size);
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prev:=nil;
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hp:=templist;
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while assigned(hp) do
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begin
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if (hp^.persistant) and (hp^.pos=pos) and (hp^.size=size) then
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begin
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if assigned(prev) then
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prev^.next:=hp^.next
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else
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templist:=hp^.next;
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{$ifdef EXTDEBUG}
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Comment(V_Debug,'temp managment : ungetpersistanttemp()'+
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' at pos '+tostr(pos)+ ' found !');
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{$endif}
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dispose(hp);
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exit;
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end;
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prev:=hp;
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hp:=hp^.next;
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end;
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{$ifdef EXTDEBUG}
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Comment(V_Warning,'temp managment problem : ungetpersistanttemp()'+
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' at pos '+tostr(pos)+ ' not found !');
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{$endif}
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end;
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procedure ungettemp(pos : longint;size : longint);
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var
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hp,newhp : pfreerecord;
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begin
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if (size mod 4)<>0 then
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size:=size+(4-(size mod 4));
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if size = 0 then
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exit;
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if pos<=lastoccupied then
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if pos=lastoccupied then
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begin
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lastoccupied:=pos+size;
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hp:=tmpfreelist;
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newhp:=nil;
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while assigned(hp) do
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begin
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{ conneting a free block }
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if hp^.pos=lastoccupied then
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begin
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if assigned(newhp) then newhp^.next:=nil
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else tmpfreelist:=nil;
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lastoccupied:=lastoccupied+hp^.size;
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dispose(hp);
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break;
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end;
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newhp:=hp;
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hp:=hp^.next;
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end;
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end
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else
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begin
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{$ifdef EXTDEBUG}
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Comment(V_Warning,'temp managment problem : ungettemp()'+
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'pos '+tostr(pos)+ '< lastoccupied '+tostr(lastoccupied)+' !');
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{$endif}
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end
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else
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begin
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new(newhp);
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{ size can be allways set }
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newhp^.size:=size;
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newhp^.pos := pos;
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{ if there is no free list }
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if not assigned(tmpfreelist) then
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begin
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{ then generate one }
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tmpfreelist:=newhp;
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newhp^.next:=nil;
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exit;
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end;
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{ search the position to insert }
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hp:=tmpfreelist;
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while assigned(hp) do
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begin
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{ conneting two blocks ? }
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if hp^.pos+hp^.size=pos then
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begin
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inc(hp^.size,size);
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dispose(newhp);
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break;
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end
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{ if the end is reached, then concat }
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else if hp^.next=nil then
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begin
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hp^.next:=newhp;
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newhp^.next:=nil;
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break;
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end
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{ falls der n<>chste Zeiger gr<67><72>er ist, dann }
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{ Einh<6E>ngen }
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else if hp^.next^.pos<=pos+size then
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begin
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{ concat two blocks ? }
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if pos+size=hp^.next^.pos then
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begin
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newhp^.next:=hp^.next^.next;
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inc(newhp^.size,hp^.next^.size);
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dispose(hp^.next);
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hp^.next:=newhp;
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end
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else
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begin
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newhp^.next:=hp^.next;
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hp^.next:=newhp;
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end;
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break;
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end;
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hp:=hp^.next;
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end;
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end;
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end;
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procedure ungetiftemp(const ref : treference);
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var
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tl,prev : pfreerecord;
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begin
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if istemp(ref) then
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begin
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prev:=nil;
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tl:=templist;
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while assigned(tl) do
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begin
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{ no release of persistant blocks this way!! }
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if tl^.persistant then
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if (ref.offset>=tl^.pos) and
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(ref.offset<tl^.pos+tl^.size) then
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begin
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{$ifdef EXTDEBUG}
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Comment(V_Debug,'temp '+
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' at pos '+tostr(ref.offset)+ ' not released because persistant !');
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{$endif}
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exit;
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end;
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if (ref.offset=tl^.pos) then
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begin
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ungettemp(ref.offset,tl^.size);
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{$ifdef TEMPDEBUG}
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Comment(V_Debug,'temp managment : ungettemp()'+
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' at pos '+tostr(tl^.pos)+ ' found !');
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{$endif}
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if assigned(prev) then
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prev^.next:=tl^.next
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else
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templist:=tl^.next;
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dispose(tl);
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exit;
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end
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else
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begin
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prev:=tl;
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tl:=tl^.next;
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end;
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end;
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{$ifdef EXTDEBUG}
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Comment(V_Warning,'Internal: temp managment problem : '+
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'temp not found for release at offset '+tostr(ref.offset));
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{$endIf}
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end;
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end;
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begin
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tmpfreelist:=nil;
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templist:=nil;
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end.
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{
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$Log$
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Revision 1.4 1998-10-09 08:56:32 pierre
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* several memory leaks fixed
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Revision 1.3 1998/07/16 08:01:42 pierre
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* small bug correction due to newinput
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(only with tempdebug conditionnal)
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Revision 1.2 1998/07/10 10:51:05 peter
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* m68k updates
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Revision 1.1 1998/06/08 16:07:41 pierre
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* temp_gen contains all temporary var functions
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(processor independent)
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}
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