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292 lines
7.6 KiB
ObjectPascal
292 lines
7.6 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2000 by Michael Van Canneyt
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Contains a generic assembler instruction object;
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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 tainst;
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{$i defines.inc}
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interface
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Uses aasm,cpubase,cpuinfo,cclasses;
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Type
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tairegalloc = class(tai)
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allocation : boolean;
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reg : tregister;
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constructor alloc(r : tregister);
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constructor dealloc(r : tregister);
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end;
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tainstruction = class(tai)
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condition : TAsmCond;
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ops : longint;
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oper : array[0..max_operands-1] of toper;
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opcode : tasmop;
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{$ifdef i386}
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segprefix : tregister;
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{$endif i386}
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is_jmp : boolean; { is this instruction a jump? (needed for optimizer) }
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Constructor Create(op : tasmop);
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Destructor Destroy;override;
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function getcopy:tlinkedlistitem;override;
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procedure loadconst(opidx:longint;l:longint);
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procedure loadsymbol(opidx:longint;s:tasmsymbol;sofs:longint);
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procedure loadref(opidx:longint;p:preference);
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procedure loadreg(opidx:longint;r:tregister);
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procedure loadoper(opidx:longint;o:toper);
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procedure SetCondition(const c:TAsmCond);
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end;
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implementation
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{*****************************************************************************
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TaiRegAlloc
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*****************************************************************************}
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constructor tairegalloc.alloc(r : tregister);
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begin
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inherited create;
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typ:=ait_regalloc;
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allocation:=true;
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reg:=r;
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end;
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constructor tairegalloc.dealloc(r : tregister);
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begin
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inherited create;
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typ:=ait_regalloc;
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allocation:=false;
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reg:=r;
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end;
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{ ---------------------------------------------------------------------
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TaInstruction Constructor/Destructor
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---------------------------------------------------------------------}
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constructor Tainstruction.Create(op : tasmop);
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begin
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inherited create;
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typ:=ait_instruction;
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is_jmp:=false;
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opcode:=op;
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ops:=0;
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fillchar(condition,sizeof(condition),0);
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fillchar(oper,sizeof(oper),0);
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end;
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destructor Tainstruction.Destroy;
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var
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i : longint;
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begin
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for i:=0 to ops-1 do
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case oper[i].typ of
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top_ref:
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dispose(oper[i].ref);
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top_symbol:
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dec(tasmsymbol(oper[i].sym).refs);
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end;
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inherited destroy;
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end;
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{ ---------------------------------------------------------------------
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Loading of operands.
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---------------------------------------------------------------------}
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procedure tainstruction.loadconst(opidx:longint;l:longint);
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begin
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if opidx>=ops then
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ops:=opidx+1;
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with oper[opidx] do
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begin
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if typ=top_ref then
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disposereference(ref);
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val:=l;
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typ:=top_const;
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end;
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end;
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procedure tainstruction.loadsymbol(opidx:longint;s:tasmsymbol;sofs:longint);
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begin
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if opidx>=ops then
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ops:=opidx+1;
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with oper[opidx] do
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begin
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if typ=top_ref then
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disposereference(ref);
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sym:=s;
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symofs:=sofs;
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typ:=top_symbol;
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end;
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{ Mark the symbol as used }
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if assigned(s) then
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inc(s.refs);
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end;
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procedure tainstruction.loadref(opidx:longint;p:preference);
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begin
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if opidx>=ops then
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ops:=opidx+1;
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with oper[opidx] do
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begin
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if typ=top_ref then
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disposereference(ref);
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if p^.is_immediate then
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begin
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{$ifdef REF_IMMEDIATE_WARN}
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Comment(V_Warning,'Reference immediate');
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{$endif}
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val:=p^.offset;
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disposereference(p);
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typ:=top_const;
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end
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else
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begin
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ref:=p;
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{ We allow this exception for i386, since overloading this would be
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too much of a a speed penalty}
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{$ifdef i386}
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if not(ref^.segment in [R_DS,R_NO]) then
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segprefix:=ref^.segment;
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{$endif}
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typ:=top_ref;
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{ mark symbol as used }
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if assigned(ref^.symbol) then
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inc(ref^.symbol.refs);
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end;
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end;
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end;
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procedure tainstruction.loadreg(opidx:longint;r:tregister);
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begin
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if opidx>=ops then
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ops:=opidx+1;
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with oper[opidx] do
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begin
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if typ=top_ref then
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disposereference(ref);
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reg:=r;
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typ:=top_reg;
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end;
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end;
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procedure tainstruction.loadoper(opidx:longint;o:toper);
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begin
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if opidx>=ops then
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ops:=opidx+1;
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if oper[opidx].typ=top_ref then
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disposereference(oper[opidx].ref);
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oper[opidx]:=o;
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{ copy also the reference }
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if oper[opidx].typ=top_ref then
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oper[opidx].ref:=newreference(o.ref^);
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end;
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{ ---------------------------------------------------------------------
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Miscellaneous methods.
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---------------------------------------------------------------------}
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procedure tainstruction.SetCondition(const c:TAsmCond);
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begin
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condition:=c;
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end;
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Function tainstruction.getcopy:tlinkedlistitem;
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var
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i : longint;
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p : tlinkedlistitem;
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begin
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p:=inherited getcopy;
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{ make a copy of the references }
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for i:=1 to ops do
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if (tainstruction(p).oper[i-1].typ=top_ref) then
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begin
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new(tainstruction(p).oper[i-1].ref);
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tainstruction(p).oper[i-1].ref^:=oper[i-1].ref^;
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end;
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getcopy:=p;
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end;
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end.
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{
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$Log$
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Revision 1.3 2001-12-29 16:29:08 jonas
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* fixed stupid copy-paste bug
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Revision 1.2 2001/12/29 15:28:57 jonas
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* powerpc/cgcpu.pas compiles :)
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* several powerpc-related fixes
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* cpuasm unit is now based on common tainst unit
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+ nppcmat unit for powerpc (almost complete)
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Revision 1.1 2001/08/26 13:36:52 florian
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* some cg reorganisation
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* some PPC updates
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Revision 1.1 2000/07/13 06:30:08 michael
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+ Initial import
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Revision 1.6 2000/01/07 01:14:54 peter
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* updated copyright to 2000
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Revision 1.5 1999/09/10 18:48:11 florian
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* some bug fixes (e.g. must_be_valid and procinfo.funcret_is_valid)
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* most things for stored properties fixed
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Revision 1.4 1999/09/03 13:10:11 jonas
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* condition is now zeroed using fillchar
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because on powerpc it's a record now
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Revision 1.3 1999/08/26 14:52:59 jonas
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* added segprefix field for i386 in tainstruction object
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Revision 1.2 1999/08/06 16:38:37 jonas
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* declared getcopy virtual, since it's already declared as such
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in cobjects.pas (FPC doesn't error on that, TP does)
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Revision 1.1 1999/08/06 16:04:05 michael
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+ introduced tainstruction
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}
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