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