{
$Id: rgcpu.pas,v 1.9 2003/04/23 13:40:33 peter Exp $
Copyright (c) 1998-2002 by Florian Klaempfl
This unit implements the register allocator for m68k
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.
****************************************************************************
}
{$i fpcdefs.inc}
unit rgcpu;
{$i fpcdefs.inc}
interface
uses
aasmbase,aasmtai,
cpubase,
rgobj;
type
trgcpu = class(trgobj)
procedure saveStateForInline(var state: pointer);override;
procedure restoreStateAfterInline(var state: pointer);override;
procedure saveUnusedState(var state: pointer);override;
procedure restoreUnusedState(var state: pointer);override;
function isaddressregister(reg: tregister): boolean; override;
function getaddressregister(list: taasmoutput): tregister; override;
procedure ungetaddressregister(list: taasmoutput; r: tregister); override;
procedure resetusableregisters;override;
procedure restoreusedintregisters(list:Taasmoutput;
const saved:Tpushedsavedint);override;
procedure saveusedintregisters(list:Taasmoutput;
var saved:Tpushedsavedint;
const s:Tsupregset);override;
procedure cleartempgen;override;
end;
implementation
uses
cgobj,tgobj,cpuinfo;
procedure trgcpu.ungetaddressregister(list: taasmoutput; r: tregister);
begin
ungetregistergenint(list,r,usableregsaddr,unusedregsaddr,
countunusedregsaddr);
end;
function trgcpu.getaddressregister(list: taasmoutput): tregister;
begin
result:=getregistergenint(list,
R_SUBWHOLE,
firstsaveaddrreg,
lastsaveaddrreg,
usedintbyproc,
usedintinproc,
unusedregsint,
countunusedregsint);
end;
function trgcpu.isaddressregister(reg: tregister): boolean;
begin
isaddressregister := reg.enum in addrregs;
end;
procedure trgcpu.resetusableregisters;
begin
inherited resetusableregisters;
{ initialize fields with constant values from cpubase }
countusableregsaddr := cpubase.c_countusableregsaddr;
usableregsaddr := cpubase.usableregsaddr;
end;
procedure Trgcpu.restoreusedintregisters(list:Taasmoutput;
const saved:Tpushedsavedint);
var r:Tsuperregister;
r2,r3:Tregister;
hr:Treference;
begin
inherited restoreusedintregisters(list, saved);
for r:=lastsaveaddrreg downto firstsaveaddrreg do
begin
if saved[r].ofs<>reg_not_saved then
begin
r2.enum:=R_INTREGISTER;
r2.number:=NR_FRAME_POINTER_REG;
reference_reset_base(hr,r2,saved[r].ofs);
r3.enum:=R_INTREGISTER;
r3.number:=r shl 8 or R_SUBWHOLE;
cg.a_reg_alloc(list,r3);
cg.a_load_ref_reg(list,OS_ADDR,hr,r3);
if not (r in unusedregsaddr) then
{ internalerror(10)
in n386cal we always save/restore the reg *state*
using save/restoreunusedstate -> the current state
may not be real (JM) }
else
begin
dec(countunusedregsaddr);
exclude(unusedregsaddr,r);
end;
tg.ungettemp(list,hr);
end;
end;
end;
procedure Trgcpu.saveusedintregisters(list:Taasmoutput;
var saved:Tpushedsavedint;
const s:Tsupregset);
var r:Tsuperregister;
r2:Tregister;
hr:Treference;
begin
inherited saveusedintregisters(list,saved,s);
for r:=firstsaveaddrreg to lastsaveaddrreg do
begin
saved[r].ofs:=reg_not_saved;
{ if the register is used by the calling subroutine and if }
{ it's not a regvar (those are handled separately) }
if not(r in is_reg_var_int) and (r in s) and
{ and is present in use }
not(r in unusedregsaddr) then
begin
{ then save it }
tg.gettemp(list,pointer_size,tt_persistant,hr);
saved[r].ofs:=hr.offset;
r2.enum:=R_INTREGISTER;
r2.number:=r shl 8 or R_SUBWHOLE;
cg.a_load_reg_ref(list,OS_ADDR,r2,hr);
cg.a_reg_dealloc(list,r2);
include(unusedregsaddr,r);
inc(countunusedregsaddr);
end;
end;
end;
procedure trgcpu.saveStateForInline(var state: pointer);
begin
inherited savestateforinline(state);
psavedstate(state)^.unusedregsaddr := unusedregsaddr;
psavedstate(state)^.usableregsaddr := usableregsaddr;
psavedstate(state)^.countunusedregsaddr := countunusedregsaddr;
end;
procedure trgcpu.restoreStateAfterInline(var state: pointer);
begin
unusedregsaddr := psavedstate(state)^.unusedregsaddr;
usableregsaddr := psavedstate(state)^.usableregsaddr;
countunusedregsaddr := psavedstate(state)^.countunusedregsaddr;
inherited restoreStateAfterInline(state);
end;
procedure trgcpu.saveUnusedState(var state: pointer);
begin
inherited saveUnusedState(state);
punusedstate(state)^.unusedregsaddr := unusedregsaddr;
punusedstate(state)^.countunusedregsaddr := countunusedregsaddr;
end;
procedure trgcpu.restoreUnusedState(var state: pointer);
begin
unusedregsaddr := punusedstate(state)^.unusedregsaddr;
countunusedregsaddr := punusedstate(state)^.countunusedregsaddr;
inherited restoreUnusedState(state);
end;
procedure trgcpu.cleartempgen;
begin
inherited cleartempgen;
countunusedregsaddr:=countusableregsaddr;
unusedregsaddr:=usableregsaddr;
end;
initialization
rg := trgcpu.create(16);
end.
{
$Log: rgcpu.pas,v $
Revision 1.9 2003/04/23 13:40:33 peter
* fix m68k compile
Revision 1.8 2003/04/22 10:09:35 daniel
+ Implemented the actual register allocator
+ Scratch registers unavailable when new register allocator used
+ maybe_save/maybe_restore unavailable when new register allocator used
Revision 1.7 2003/02/19 22:00:16 daniel
* Code generator converted to new register notation
- Horribily outdated todo.txt removed
Revision 1.6 2003/02/02 19:25:54 carl
* Several bugfixes for m68k target (register alloc., opcode emission)
+ VIS target
+ Generic add more complete (still not verified)
Revision 1.5 2003/01/08 18:43:57 daniel
* Tregister changed into a record
Revision 1.4 2002/09/07 15:25:14 peter
* old logs removed and tabs fixed
Revision 1.3 2002/08/23 16:14:50 peter
* tempgen cleanup
* tt_noreuse temp type added that will be used in genentrycode
Revision 1.2 2002/08/12 15:08:44 carl
+ stab register indexes for powerpc (moved from gdb to cpubase)
+ tprocessor enumeration moved to cpuinfo
+ linker in target_info is now a class
* many many updates for m68k (will soon start to compile)
- removed some ifdef or correct them for correct cpu
Revision 1.1 2002/08/05 17:26:09 carl
+ updated m68k
}
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