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689 lines
22 KiB
ObjectPascal
689 lines
22 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Mazen NEIFER
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Does the parsing for the i386 GNU AS styled inline assembler.
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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 racpugas;
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{$i fpcdefs.inc}
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Interface
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uses
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raatt,racpu;
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type
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tSparcReader = class(tattreader)
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function is_asmopcode(const s: string):boolean;override;
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procedure handleopcode;override;
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procedure BuildReference(oper : tSparcoperand);
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procedure BuildOperand(oper : tSparcoperand);
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procedure BuildOpCode(instr : tSparcinstruction);
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procedure ReadPercent(oper : tSparcoperand);
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procedure ReadSym(oper : tSparcoperand);
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procedure ConvertCalljmp(instr : tSparcinstruction);
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procedure handlepercent;override;
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end;
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Implementation
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uses
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{ helpers }
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cutils,
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{ global }
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globtype,verbose,
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systems,
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{ aasm }
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cpubase,aasmbase,aasmtai,aasmdata,aasmcpu,
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{ symtable }
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symconst,symsym,
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{ parser }
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scanner,
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procinfo,
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rabase,rautils,
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cgbase,cgobj
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;
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procedure TSparcReader.ReadSym(oper : tSparcoperand);
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var
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tempstr, mangledname : string;
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typesize,l,k : aint;
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begin
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tempstr:=actasmpattern;
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Consume(AS_ID);
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{ typecasting? }
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if (actasmtoken=AS_LPAREN) and
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SearchType(tempstr,typesize) then
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begin
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oper.hastype:=true;
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Consume(AS_LPAREN);
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BuildOperand(oper);
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Consume(AS_RPAREN);
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if oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL] then
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oper.SetSize(typesize,true);
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end
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else
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if not oper.SetupVar(tempstr,false) then
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Message1(sym_e_unknown_id,tempstr);
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{ record.field ? }
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if actasmtoken=AS_DOT then
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begin
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BuildRecordOffsetSize(tempstr,l,k,mangledname,false);
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if (mangledname<>'') then
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Message(asmr_e_invalid_reference_syntax);
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inc(oper.opr.ref.offset,l);
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end;
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end;
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procedure TSparcReader.ReadPercent(oper : tSparcoperand);
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begin
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{ check for ...@ }
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if actasmtoken=AS_AT then
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begin
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if (oper.opr.ref.symbol=nil) and
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(oper.opr.ref.offset = 0) then
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Message(asmr_e_invalid_reference_syntax);
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Consume(AS_AT);
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if actasmtoken=AS_ID then
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begin
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if upper(actasmpattern)='LO' then
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oper.opr.ref.refaddr:=addr_low
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else if upper(actasmpattern)='HI' then
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oper.opr.ref.refaddr:=addr_high
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else
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Message(asmr_e_invalid_reference_syntax);
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Consume(AS_ID);
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end
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else
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Message(asmr_e_invalid_reference_syntax);
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end;
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end;
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Procedure TSparcReader.BuildReference(oper : tSparcoperand);
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var
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l : aint;
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regs : byte;
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hasimm : boolean;
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begin
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oper.initref;
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regs:=0;
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hasimm:=false;
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Consume(AS_LBRACKET);
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repeat
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Case actasmtoken of
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AS_INTNUM,
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AS_MINUS,
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AS_PLUS:
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Begin
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if hasimm or (regs>1) then
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(true);
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break;
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End;
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oper.opr.Ref.Offset:=BuildConstExpression(false,true);
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hasimm:=true;
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End;
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AS_REGISTER:
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Begin
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if regs<2 then
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begin
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if regs=0 then
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oper.opr.ref.base:=actasmregister
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else
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oper.opr.ref.index:=actasmregister;
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inc(regs);
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end
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else
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begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(true);
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break;
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end;
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Consume(AS_REGISTER);
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end;
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AS_ID:
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Begin
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l:=BuildConstExpression(true,true);
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inc(oper.opr.ref.offset,l);
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End;
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AS_RBRACKET:
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begin
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if (regs=0) and (not hasimm) then
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Message(asmr_e_invalid_reference_syntax);
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Consume(AS_RBRACKET);
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break;
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end;
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else
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(false);
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break;
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end;
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end;
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until false;
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end;
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procedure TSparcReader.handlepercent;
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var
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len : longint;
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begin
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len:=1;
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actasmpattern[len]:='%';
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c:=current_scanner.asmgetchar;
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{ to be a register there must be a letter and not a number }
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while c in ['a'..'z','A'..'Z','0'..'9'] do
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Begin
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inc(len);
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actasmpattern[len]:=c;
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c:=current_scanner.asmgetchar;
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end;
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actasmpattern[0]:=chr(len);
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uppervar(actasmpattern);
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if is_register(actasmpattern) then
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exit;
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if (actasmpattern='%HI') then
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actasmtoken:=AS_HI
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else if (actasmpattern='%LO')then
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actasmtoken:=AS_LO
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else
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Message(asmr_e_invalid_register);
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end;
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Procedure TSparcReader.BuildOperand(oper : tSparcoperand);
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var
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expr : string;
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typesize,l : aint;
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procedure AddLabelOperand(hl:tasmlabel);
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begin
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if not(actasmtoken in [AS_PLUS,AS_MINUS,AS_LPAREN]) and
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is_calljmp(actopcode) then
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begin
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oper.opr.typ:=OPR_SYMBOL;
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oper.opr.symbol:=hl;
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end
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else
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begin
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oper.InitRef;
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oper.opr.ref.symbol:=hl;
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end;
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end;
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procedure MaybeRecordOffset;
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var
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mangledname: string;
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hasdot : boolean;
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l,
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toffset,
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tsize : aint;
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begin
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if not(actasmtoken in [AS_DOT,AS_PLUS,AS_MINUS]) then
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exit;
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l:=0;
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hasdot:=(actasmtoken=AS_DOT);
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if hasdot then
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begin
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if expr<>'' then
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begin
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BuildRecordOffsetSize(expr,toffset,tsize,mangledname,false);
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if (oper.opr.typ<>OPR_CONSTANT) and
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(mangledname<>'') then
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Message(asmr_e_wrong_sym_type);
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inc(l,toffset);
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oper.SetSize(tsize,true);
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end;
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end;
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if actasmtoken in [AS_PLUS,AS_MINUS] then
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inc(l,BuildConstExpression(true,false));
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case oper.opr.typ of
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OPR_LOCAL :
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begin
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{ don't allow direct access to fields of parameters, because that
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will generate buggy code. Allow it only for explicit typecasting }
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if hasdot and
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(not oper.hastype) and
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(tabstractnormalvarsym(oper.opr.localsym).owner.symtabletype=parasymtable) and
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(current_procinfo.procdef.proccalloption<>pocall_register) then
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Message(asmr_e_cannot_access_field_directly_for_parameters);
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inc(oper.opr.localsymofs,l)
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end;
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OPR_CONSTANT :
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if (mangledname<>'') then
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begin
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if (oper.opr.val<>0) then
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Message(asmr_e_wrong_sym_type);
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oper.opr.typ:=OPR_SYMBOL;
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oper.opr.symbol:=current_asmdata.RefAsmSymbol(mangledname);
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end
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else
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inc(oper.opr.val,l);
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OPR_REFERENCE :
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inc(oper.opr.ref.offset,l);
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OPR_SYMBOL:
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Message(asmr_e_invalid_symbol_ref);
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else
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internalerror(200309221);
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end;
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end;
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var
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tempreg : tregister;
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tempstr : string;
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tempsymtyp : TAsmSymType;
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hl : tasmlabel;
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gotplus,
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negative : boolean;
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Begin
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expr:='';
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gotplus:=true;
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negative:=false;
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repeat
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case actasmtoken of
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AS_MINUS :
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begin
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consume(AS_MINUS);
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negative:=true;
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gotplus:=true;
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end;
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AS_PLUS :
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begin
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consume(AS_PLUS);
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negative:=false;
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gotplus:=true;
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end;
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AS_INTNUM,
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AS_MOD:
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Begin
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if not gotplus then
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Message(asmr_e_invalid_reference_syntax);
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l:=BuildConstExpression(True,False);
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if negative then
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l:=-l;
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{ Constant memory offset }
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oper.InitRef;
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oper.opr.ref.refaddr:=addr_full;
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oper.opr.ref.offset:=l;
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GotPlus:=(prevasmtoken=AS_PLUS) or
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(prevasmtoken=AS_MINUS);
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if GotPlus then
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negative:=(prevasmtoken=AS_MINUS);
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end;
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AS_LBRACKET :
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begin
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{ memory reference }
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BuildReference(oper);
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gotplus:=false;
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end;
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AS_HI,
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AS_LO:
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begin
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{ Low or High part of a constant (or constant
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memory location) }
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oper.InitRef;
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if actasmtoken=AS_LO then
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oper.opr.ref.refaddr:=addr_low
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else
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oper.opr.ref.refaddr:=addr_high;
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Consume(actasmtoken);
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Consume(AS_LPAREN);
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BuildConstSymbolExpression(false, true,false,l,tempstr,tempsymtyp);
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if not assigned(oper.opr.ref.symbol) then
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oper.opr.ref.symbol:=current_asmdata.RefAsmSymbol(tempstr)
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else
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Message(asmr_e_cant_have_multiple_relocatable_symbols);
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case oper.opr.typ of
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OPR_CONSTANT :
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inc(oper.opr.val,l);
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OPR_LOCAL :
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inc(oper.opr.localsymofs,l);
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OPR_REFERENCE :
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inc(oper.opr.ref.offset,l);
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else
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internalerror(200309202);
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end;
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Consume(AS_RPAREN);
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gotplus:=false;
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end;
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AS_ID: { A constant expression, or a Variable ref. }
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Begin
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{ Local Label ? }
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if is_locallabel(actasmpattern) then
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begin
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CreateLocalLabel(actasmpattern,hl,false);
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Consume(AS_ID);
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AddLabelOperand(hl);
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end
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else
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{ Check for label }
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if SearchLabel(actasmpattern,hl,false) then
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begin
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Consume(AS_ID);
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AddLabelOperand(hl);
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end
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else
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{ probably a variable or normal expression }
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{ or a procedure (such as in CALL ID) }
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Begin
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{ is it a constant ? }
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if SearchIConstant(actasmpattern,l) then
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Begin
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if not (oper.opr.typ in [OPR_NONE,OPR_CONSTANT]) then
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Message(asmr_e_invalid_operand_type);
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BuildConstantOperand(oper);
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end
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else
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begin
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expr:=actasmpattern;
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Consume(AS_ID);
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{ typecasting? }
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if (actasmtoken=AS_LPAREN) and
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SearchType(expr,typesize) then
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begin
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oper.hastype:=true;
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Consume(AS_LPAREN);
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BuildOperand(oper);
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Consume(AS_RPAREN);
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if oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL] then
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oper.SetSize(typesize,true);
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end
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else
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begin
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if oper.SetupVar(expr,false) then
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ReadPercent(oper)
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else
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Begin
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{ look for special symbols ... }
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if expr= '__HIGH' then
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begin
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consume(AS_LPAREN);
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if not oper.setupvar('high'+actasmpattern,false) then
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Message1(sym_e_unknown_id,'high'+actasmpattern);
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consume(AS_ID);
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consume(AS_RPAREN);
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end
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else
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if expr = '__RESULT' then
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oper.SetUpResult
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else
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if expr = '__SELF' then
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oper.SetupSelf
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else
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if expr = '__OLDEBP' then
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oper.SetupOldEBP
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else
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Message1(sym_e_unknown_id,expr);
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end;
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end;
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end;
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if actasmtoken=AS_DOT then
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MaybeRecordOffset;
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{ add a constant expression? }
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if (actasmtoken=AS_PLUS) then
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begin
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l:=BuildConstExpression(true,false);
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case oper.opr.typ of
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OPR_CONSTANT :
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inc(oper.opr.val,l);
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OPR_LOCAL :
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inc(oper.opr.localsymofs,l);
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OPR_REFERENCE :
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inc(oper.opr.ref.offset,l);
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else
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internalerror(200309202);
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end;
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end
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end;
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gotplus:=false;
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end;
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AS_REGISTER: { Register, a variable reference or a constant reference }
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Begin
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{ save the type of register used. }
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tempreg:=actasmregister;
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Consume(AS_REGISTER);
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if (oper.opr.typ in [OPR_REGISTER,OPR_REFERENCE]) and gotplus then
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begin
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oper.initref;
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oper.opr.ref.refaddr:=addr_full;
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if oper.opr.ref.base<>NR_NO then
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oper.opr.ref.base:=tempreg
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else
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if oper.opr.ref.index<>NR_NO then
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oper.opr.ref.index:=tempreg
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else
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Message(asmr_e_multiple_index);
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end
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else
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begin
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if (oper.opr.typ<>OPR_NONE) then
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Message(asmr_e_invalid_operand_type);
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oper.opr.typ:=OPR_REGISTER;
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oper.opr.reg:=tempreg;
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end;
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gotplus:=false;
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end;
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AS_END,
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AS_SEPARATOR,
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AS_COMMA:
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break;
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else
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Begin
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Message(asmr_e_syn_operand);
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Consume(actasmtoken);
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end;
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end; { end case }
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until false;
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end;
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{*****************************************************************************
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TSparcReader
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*****************************************************************************}
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procedure TSparcReader.BuildOpCode(instr : tSparcinstruction);
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var
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operandnum : longint;
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Begin
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{ opcode }
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if (actasmtoken<>AS_OPCODE) then
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Begin
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Message(asmr_e_invalid_or_missing_opcode);
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RecoverConsume(true);
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exit;
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end;
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{ Fill the instr object with the current state }
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with instr do
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begin
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Opcode:=ActOpcode;
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condition:=ActCondition;
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end;
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{ We are reading operands, so opcode will be an AS_ID }
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operandnum:=1;
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Consume(AS_OPCODE);
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{ Zero operand opcode ? }
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if actasmtoken in [AS_SEPARATOR,AS_END] then
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begin
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operandnum:=0;
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exit;
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end;
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{ delayslot annulled? }
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if (actasmtoken=AS_COMMA) then
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begin
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consume(AS_COMMA);
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if actasmpattern='A' then
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instr.delayslot_annulled:=true;
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{ force reading of AS_COMMA instead of AS_ID, otherwise
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a label .L0 will first read a AS_DOT instead of AS_ID }
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actasmtoken:=AS_COMMA;
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consume(AS_COMMA);
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end;
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{ Read the operands }
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repeat
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case actasmtoken of
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AS_COMMA: { Operand delimiter }
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Begin
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if operandnum>Max_Operands then
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Message(asmr_e_too_many_operands)
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else
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begin
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{ condition operands doesn't set the operand but write to the
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condition field of the instruction
|
|
}
|
|
if instr.Operands[operandnum].opr.typ<>OPR_NONE then
|
|
Inc(operandnum);
|
|
end;
|
|
Consume(AS_COMMA);
|
|
end;
|
|
AS_SEPARATOR,
|
|
AS_END : { End of asm operands for this opcode }
|
|
begin
|
|
break;
|
|
end;
|
|
else
|
|
BuildOperand(instr.Operands[operandnum] as tSparcoperand);
|
|
end; { end case }
|
|
until false;
|
|
if (operandnum=1) and (instr.Operands[operandnum].opr.typ=OPR_NONE) then
|
|
dec(operandnum);
|
|
instr.Ops:=operandnum;
|
|
end;
|
|
|
|
|
|
function TSparcReader.is_asmopcode(const s: string):boolean;
|
|
var
|
|
cond:TAsmCond;
|
|
Begin
|
|
{ making s a value parameter would break other assembler readers }
|
|
is_asmopcode:=false;
|
|
|
|
{ clear op code }
|
|
actopcode:=A_None;
|
|
{ clear condition }
|
|
fillchar(actcondition,sizeof(actcondition),0);
|
|
|
|
{ Search opcodes }
|
|
actopcode:=tasmop(PtrUInt(iasmops.Find(s)));
|
|
if actopcode<>A_NONE then
|
|
begin
|
|
actasmtoken:=AS_OPCODE;
|
|
result:=TRUE;
|
|
exit;
|
|
end;
|
|
|
|
{ not found, check branch instructions }
|
|
if (Upcase(s[1])='B') or
|
|
((Upcase(s[1])='F') and (Upcase(s[2])='B')) then
|
|
begin
|
|
{ we can search here without an extra table which is sorted by string length
|
|
because we take the whole remaining string without the leading B }
|
|
if (Upcase(s[1])='F') then
|
|
actopcode := A_FBxx
|
|
else
|
|
actopcode := A_Bxx;
|
|
for cond:=low(TAsmCond) to high(TAsmCond) do
|
|
if (Upper(copy(s,2,length(s)-1))=Upper(Cond2Str[cond])) then
|
|
begin
|
|
actasmtoken:=AS_OPCODE;
|
|
actcondition:=cond;
|
|
is_asmopcode:=true;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TSparcReader.ConvertCalljmp(instr : tSparcinstruction);
|
|
var
|
|
newopr : toprrec;
|
|
begin
|
|
if instr.Operands[1].opr.typ=OPR_REFERENCE then
|
|
with newopr do
|
|
begin
|
|
typ:=OPR_SYMBOL;
|
|
symbol:=instr.Operands[1].opr.ref.symbol;
|
|
symofs:=instr.Operands[1].opr.ref.offset;
|
|
if (instr.Operands[1].opr.ref.base<>NR_NO) or
|
|
(instr.Operands[1].opr.ref.index<>NR_NO) or
|
|
(instr.Operands[1].opr.ref.refaddr<>addr_full) then
|
|
Message(asmr_e_syn_operand);
|
|
instr.Operands[1].opr:=newopr;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TSparcReader.handleopcode;
|
|
var
|
|
instr : tSparcinstruction;
|
|
begin
|
|
instr:=TSparcInstruction.Create(TSparcOperand);
|
|
BuildOpcode(instr);
|
|
with instr do
|
|
begin
|
|
condition := actcondition;
|
|
if is_calljmp(opcode) then
|
|
ConvertCalljmp(instr);
|
|
ConcatInstruction(curlist);
|
|
Free;
|
|
end;
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
Initialize
|
|
*****************************************************************************}
|
|
|
|
const
|
|
asmmode_Sparc_att_info : tasmmodeinfo =
|
|
(
|
|
id : asmmode_Sparc_gas;
|
|
idtxt : 'GAS';
|
|
casmreader : TSparcReader;
|
|
);
|
|
|
|
asmmode_Sparc_standard_info : tasmmodeinfo =
|
|
(
|
|
id : asmmode_standard;
|
|
idtxt : 'STANDARD';
|
|
casmreader : TSparcReader;
|
|
);
|
|
|
|
initialization
|
|
RegisterAsmMode(asmmode_Sparc_att_info);
|
|
RegisterAsmMode(asmmode_Sparc_standard_info);
|
|
end.
|