fpc/compiler/temp_gen.pas
2001-06-02 19:20:10 +00:00

666 lines
20 KiB
ObjectPascal

{
$Id$
Copyright (C) 1998-2000 by Florian Klaempfl
This unit handles the temporary variables stuff for i386
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit temp_gen;
{$i defines.inc}
interface
uses
cpubase,cpuinfo,globals,
hcodegen,verbose,fmodule,aasm;
{$ifdef newcg}
const
countusableregint : byte = c_countusableregsint;
countusableregfpu : byte = c_countusableregsfpu;
countusableregmm : byte = c_countusableregsmm;
{$endif newcg}
type
ttemptype = (tt_none,tt_free,tt_normal,tt_persistant,
tt_ansistring,tt_freeansistring,tt_widestring,tt_freewidestring,
tt_interfacecom,tt_freeinterfacecom);
ttemptypeset = set of ttemptype;
ptemprecord = ^ttemprecord;
ttemprecord = record
temptype : ttemptype;
pos : longint;
size : longint;
next : ptemprecord;
nextfree : ptemprecord; { for faster freeblock checking }
{$ifdef EXTDEBUG}
posinfo,
releaseposinfo : tfileposinfo;
{$endif}
end;
var
{ contains all temps }
templist : ptemprecord;
{ contains all free temps using nextfree links }
tempfreelist : ptemprecord;
{ Offsets of the first/last temp }
firsttemp,
lasttemp : longint;
{ generates temporary variables }
procedure resettempgen;
procedure setfirsttemp(l : longint);
function gettempsize : longint;
function newtempofsize(size : longint) : longint;
function gettempofsize(size : longint) : longint;
{ special call for inlined procedures }
function gettempofsizepersistant(size : longint) : longint;
procedure gettempofsizereferencepersistant(l : longint;var ref : treference);
{ for parameter func returns }
procedure normaltemptopersistant(pos : longint);
procedure persistanttemptonormal(pos : longint);
{procedure ungettemp(pos : longint;size : longint);}
procedure ungetpersistanttemp(pos : longint);
procedure ungetpersistanttempreference(const ref : treference);
procedure gettempofsizereference(l : longint;var ref : treference);
function istemp(const ref : treference) : boolean;
procedure ungetiftemp(const ref : treference);
function getsizeoftemp(const ref: treference): longint;
function ungetiftempansi(const ref : treference) : boolean;
procedure gettempansistringreference(var ref : treference);
function ungetiftempwidestr(const ref : treference) : boolean;
procedure gettempwidestringreference(var ref : treference);
function ungetiftempintfcom(const ref : treference) : boolean;
procedure gettempintfcomreference(var ref : treference);
implementation
uses
cutils,systems;
procedure resettempgen;
var
hp : ptemprecord;
begin
{ Clear the old templist }
while assigned(templist) do
begin
{$ifdef EXTDEBUG}
case templist^.temptype of
tt_normal,
tt_persistant :
Comment(V_Warning,'temporary assignment of size '+
tostr(templist^.size)+' from pos '+tostr(templist^.posinfo.line)+
':'+tostr(templist^.posinfo.column)+
' at pos '+tostr(templist^.pos)+
' not freed at the end of the procedure');
tt_ansistring :
Comment(V_Warning,'temporary ANSI assignment of size '+
tostr(templist^.size)+' from pos '+tostr(templist^.posinfo.line)+
':'+tostr(templist^.posinfo.column)+
' at pos '+tostr(templist^.pos)+
' not freed at the end of the procedure');
end;
{$endif}
hp:=templist;
templist:=hp^.next;
dispose(hp);
end;
templist:=nil;
tempfreelist:=nil;
firsttemp:=0;
lasttemp:=0;
end;
procedure setfirsttemp(l : longint);
begin
{ this is a negative value normally }
if l < 0 then
Begin
if odd(l) then
Dec(l);
end
else
Begin
if odd(l) then
Inc(l);
end;
firsttemp:=l;
lasttemp:=l;
end;
function newtempofsize(size : longint) : longint;
var
tl : ptemprecord;
begin
{ we need to allocate at least a minimum of 4 bytes, else
we get two temps at the same position resulting in problems
when finding the corresponding temprecord }
if size=0 then
size:=4;
{ Just extend the temp, everything below has been use
already }
dec(lasttemp,size);
{ now we can create the templist entry }
new(tl);
tl^.temptype:=tt_normal;
tl^.pos:=lasttemp;
tl^.size:=size;
tl^.next:=templist;
tl^.nextfree:=nil;
templist:=tl;
newtempofsize:=tl^.pos;
end;
const
lasttempofsize : ptemprecord = nil;
function gettempofsize(size : longint) : longint;
var
tl,
bestslot,bestprev,
hprev,hp : ptemprecord;
bestsize,ofs : longint;
begin
bestprev:=nil;
bestslot:=nil;
tl:=nil;
bestsize:=0;
{$ifdef EXTDEBUG}
if size=0 then
Comment(V_Warning,'Temp of size 0 requested');
{$endif}
{ Align needed size on 4 bytes }
if (size mod 4)<>0 then
size:=size+(4-(size mod 4));
{ First check the tmpfreelist }
if assigned(tempfreelist) then
begin
{ Check for a slot with the same size first }
hprev:=nil;
hp:=tempfreelist;
while assigned(hp) do
begin
{$ifdef EXTDEBUG}
if hp^.temptype<>tt_free then
Comment(V_Warning,'Temp in freelist is not set to tt_free');
{$endif}
if hp^.size>=size then
begin
{ Slot is the same size, then leave immediatly }
if hp^.size=size then
begin
bestprev:=hprev;
bestslot:=hp;
bestsize:=size;
break;
end
else
begin
if (bestsize=0) or (hp^.size<bestsize) then
begin
bestprev:=hprev;
bestslot:=hp;
bestsize:=hp^.size;
end;
end;
end;
hprev:=hp;
hp:=hp^.nextfree;
end;
end;
{ Reuse an old temp ? }
if assigned(bestslot) then
begin
if bestsize=size then
begin
bestslot^.temptype:=tt_normal;
ofs:=bestslot^.pos;
tl:=bestslot;
{ Remove from the tempfreelist }
if assigned(bestprev) then
bestprev^.nextfree:=bestslot^.nextfree
else
tempfreelist:=bestslot^.nextfree;
end
else
begin
{ Resize the old block }
dec(bestslot^.size,size);
{ Create new block and link after bestslot }
new(tl);
tl^.temptype:=tt_normal;
tl^.pos:=bestslot^.pos+bestslot^.size;
ofs:=tl^.pos;
tl^.size:=size;
tl^.nextfree:=nil;
{ link the new block }
tl^.next:=bestslot^.next;
bestslot^.next:=tl;
end;
end
else
begin
ofs:=newtempofsize(size);
tl:=templist;
end;
lasttempofsize:=tl;
{$ifdef EXTDEBUG}
tl^.posinfo:=aktfilepos;
{$endif}
exprasmList.concat(Taitempalloc.alloc(ofs,size));
gettempofsize:=ofs;
end;
function gettempofsizepersistant(size : longint) : longint;
var
l : longint;
begin
l:=gettempofsize(size);
lasttempofsize^.temptype:=tt_persistant;
{$ifdef EXTDEBUG}
Comment(V_Debug,'temp managment : call to gettempofsizepersistant()'+
' with size '+tostr(size)+' returned '+tostr(l));
{$endif}
gettempofsizepersistant:=l;
end;
function gettempsize : longint;
var
_align : longint;
begin
{ align to 4 bytes at least
otherwise all those subl $2,%esp are meaningless PM }
_align:=target_info.stackalignment;
if _align<4 then
_align:=4;
gettempsize:=Align(-lasttemp,_align);
end;
procedure gettempofsizereference(l : longint;var ref : treference);
begin
{ do a reset, because the reference isn't used }
reset_reference(ref);
ref.offset:=gettempofsize(l);
ref.base:=procinfo^.framepointer;
end;
procedure gettempofsizereferencepersistant(l : longint;var ref : treference);
begin
{ do a reset, because the reference isn't used }
reset_reference(ref);
ref.offset:=gettempofsizepersistant(l);
ref.base:=procinfo^.framepointer;
end;
procedure gettemppointerreferencefortype(var ref : treference; const usedtype, freetype: ttemptype);
var
foundslot,tl : ptemprecord;
begin
{ do a reset, because the reference isn't used }
reset_reference(ref);
ref.base:=procinfo^.framepointer;
{ Reuse old slot ? }
foundslot:=nil;
tl:=templist;
while assigned(tl) do
begin
if tl^.temptype=freetype then
begin
foundslot:=tl;
{$ifdef EXTDEBUG}
tl^.posinfo:=aktfilepos;
{$endif}
break;
end;
tl:=tl^.next;
end;
if assigned(foundslot) then
begin
foundslot^.temptype:=usedtype;
ref.offset:=foundslot^.pos;
end
else
begin
ref.offset:=newtempofsize(target_info.size_of_pointer);
{$ifdef EXTDEBUG}
templist^.posinfo:=aktfilepos;
{$endif}
templist^.temptype:=usedtype;
end;
exprasmList.concat(Taitempalloc.alloc(ref.offset,target_info.size_of_pointer));
end;
function ungettemppointeriftype(const ref : treference; const usedtype, freetype: ttemptype) : boolean;
var
tl : ptemprecord;
begin
ungettemppointeriftype:=false;
tl:=templist;
while assigned(tl) do
begin
if tl^.pos=ref.offset then
begin
if tl^.temptype=usedtype then
begin
tl^.temptype:=freetype;
ungettemppointeriftype:=true;
exprasmList.concat(Taitempalloc.dealloc(tl^.pos,tl^.size));
exit;
{$ifdef EXTDEBUG}
end
else if (tl^.temptype=freetype) then
begin
Comment(V_Debug,'temp managment problem : ungettemppointeriftype()'+
' at pos '+tostr(ref.offset)+ ' already free !');
{$endif}
end;
end;
tl:=tl^.next;
end;
end;
procedure gettempansistringreference(var ref : treference);
begin
gettemppointerreferencefortype(ref,tt_ansistring,tt_freeansistring);
end;
procedure gettempwidestringreference(var ref : treference);
begin
gettemppointerreferencefortype(ref,tt_widestring,tt_freewidestring);
end;
function ungetiftempansi(const ref : treference) : boolean;
begin
ungetiftempansi:=ungettemppointeriftype(ref,tt_ansistring,tt_freeansistring);
end;
function ungetiftempwidestr(const ref : treference) : boolean;
begin
ungetiftempwidestr:=ungettemppointeriftype(ref,tt_widestring,tt_widestring);
end;
procedure gettempintfcomreference(var ref : treference);
begin
gettemppointerreferencefortype(ref,tt_interfacecom,tt_freeinterfacecom);
end;
function ungetiftempintfcom(const ref : treference) : boolean;
begin
ungetiftempintfcom:=ungettemppointeriftype(ref,tt_ansistring,tt_freeansistring);
end;
function istemp(const ref : treference) : boolean;
begin
{ ref.index = R_NO was missing
led to problems with local arrays
with lower bound > 0 (PM) }
istemp:=((ref.base=procinfo^.framepointer) and
{$ifdef i386}
(ref.index=R_NO) and
{$endif}
(ref.offset<firsttemp));
end;
procedure persistanttemptonormal(pos : longint);
var
hp : ptemprecord;
begin
hp:=templist;
while assigned(hp) do
if (hp^.pos=pos) and (hp^.temptype=tt_persistant) then
begin
{$ifdef EXTDEBUG}
Comment(V_Debug,'temp managment : persistanttemptonormal()'+
' at pos '+tostr(pos)+ ' found !');
{$endif}
hp^.temptype:=tt_normal;
exit;
end
else
hp:=hp^.next;
{$ifdef EXTDEBUG}
Comment(V_Debug,'temp managment problem : persistanttemptonormal()'+
' at pos '+tostr(pos)+ ' not found !');
{$endif}
end;
procedure normaltemptopersistant(pos : longint);
var
hp : ptemprecord;
begin
hp:=templist;
while assigned(hp) do
if (hp^.pos=pos) and (hp^.temptype=tt_normal) then
begin
{$ifdef EXTDEBUG}
Comment(V_Debug,'temp managment : normaltemptopersistant()'+
' at pos '+tostr(pos)+ ' found !');
{$endif}
hp^.temptype:=tt_persistant;
exit;
end
else
hp:=hp^.next;
{$ifdef EXTDEBUG}
Comment(V_Debug,'temp managment problem : normaltemptopersistant()'+
' at pos '+tostr(pos)+ ' not found !');
{$endif}
end;
function ungettemp(pos:longint;allowtype:ttemptype):ttemptype;
var
hp,hnext,hprev,hprevfree : ptemprecord;
begin
ungettemp:=tt_none;
hp:=templist;
hprev:=nil;
hprevfree:=nil;
while assigned(hp) do
begin
if (hp^.pos=pos) then
begin
{ check type }
ungettemp:=hp^.temptype;
if hp^.temptype<>allowtype then
begin
exit;
end;
exprasmList.concat(Taitempalloc.dealloc(hp^.pos,hp^.size));
{ set this block to free }
hp^.temptype:=tt_free;
{ Update tempfreelist }
if assigned(hprevfree) then
begin
{ Connect with previous? }
if assigned(hprev) and (hprev^.temptype=tt_free) then
begin
inc(hprev^.size,hp^.size);
hprev^.next:=hp^.next;
dispose(hp);
hp:=hprev;
end
else
hprevfree^.nextfree:=hp;
end
else
begin
hp^.nextfree:=tempfreelist;
tempfreelist:=hp;
end;
{ Next block free ? Yes, then concat }
hnext:=hp^.next;
if assigned(hnext) and (hnext^.temptype=tt_free) then
begin
inc(hp^.size,hnext^.size);
hp^.nextfree:=hnext^.nextfree;
hp^.next:=hnext^.next;
dispose(hnext);
end;
exit;
end;
if (hp^.temptype=tt_free) then
hprevfree:=hp;
hprev:=hp;
hp:=hp^.next;
end;
ungettemp:=tt_none;
end;
function getsizeoftemp(const ref: treference): longint;
var
hp : ptemprecord;
begin
hp:=templist;
while assigned(hp) do
begin
if (hp^.pos=ref.offset) then
begin
getsizeoftemp := hp^.size;
exit;
end;
hp := hp^.next;
end;
getsizeoftemp := -1;
end;
procedure ungetpersistanttemp(pos : longint);
begin
{$ifdef EXTDEBUG}
if ungettemp(pos,tt_persistant)<>tt_persistant then
Comment(V_Warning,'temp managment problem : ungetpersistanttemp()'+
' at pos '+tostr(pos)+ ' not found !');
{$else}
ungettemp(pos,tt_persistant);
{$endif}
end;
procedure ungetpersistanttempreference(const ref : treference);
begin
ungetpersistanttemp(ref.offset);
end;
procedure ungetiftemp(const ref : treference);
{$ifdef EXTDEBUG}
var
tt : ttemptype;
{$endif}
begin
if istemp(ref) then
begin
{ first check if ansistring }
if ungetiftempansi(ref) then
exit;
{$ifndef EXTDEBUG}
ungettemp(ref.offset,tt_normal);
{$else}
tt:=ungettemp(ref.offset,tt_normal);
if tt=tt_persistant then
Comment(V_Debug,'temp at pos '+tostr(ref.offset)+ ' not released because persistant!');
if tt=tt_none then
Comment(V_Warning,'temp not found for release at offset '+tostr(ref.offset));
{$endif}
end;
end;
procedure inittemps;
begin
tempfreelist:=nil;
templist:=nil;
end;
begin
InitTemps;
end.
{
$Log$
Revision 1.15 2001-06-02 19:20:10 peter
* allocate at least 4 bytes, also for 0 byte temps. Give a warning
with extdebug
Revision 1.14 2001/05/27 14:30:55 florian
+ some widestring stuff added
Revision 1.13 2001/04/18 22:02:00 peter
* registration of targets and assemblers
Revision 1.12 2001/04/13 01:22:17 peter
* symtable change to classes
* range check generation and errors fixed, make cycle DEBUG=1 works
* memory leaks fixed
Revision 1.11 2001/01/05 17:36:58 florian
* the info about exception frames is stored now on the stack
instead on the heap
Revision 1.10 2000/12/31 11:04:43 jonas
+ sizeoftemp() function
Revision 1.9 2000/12/25 00:07:30 peter
+ new tlinkedlist class (merge of old tstringqueue,tcontainer and
tlinkedlist objects)
Revision 1.8 2000/11/30 22:16:50 florian
* moved to i386
Revision 1.7 2000/11/29 00:30:42 florian
* unused units removed from uses clause
* some changes for widestrings
Revision 1.6 2000/11/04 14:25:22 florian
+ merged Attila's changes for interfaces, not tested yet
Revision 1.5 2000/09/30 16:08:45 peter
* more cg11 updates
Revision 1.4 2000/09/24 15:06:31 peter
* use defines.inc
Revision 1.3 2000/08/27 16:11:55 peter
* moved some util functions from globals,cobjects to cutils
* splitted files into finput,fmodule
Revision 1.2 2000/07/13 11:32:52 michael
+ removed logs
}