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561 lines
18 KiB
ObjectPascal
561 lines
18 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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cgbase,
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rautils,
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raatt;
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type
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tMipsReader = class(tattreader)
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actrel: trefaddr;
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function is_asmopcode(const s: string):boolean;override;
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procedure BuildOperand(oper : TOperand);
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procedure BuildOpCode(instr : TInstruction);
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procedure handlepercent;override;
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procedure handledollar;override;
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procedure handleopcode;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,symdef,
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{ parser }
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scanner,
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procinfo,
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rabase,
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rgbase,
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itcpugas,
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cgobj,paramgr
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;
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procedure TMipsReader.handledollar;
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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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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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actasmpattern:=lower(actasmpattern);
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actasmregister:=gas_regnum_search(actasmpattern);
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if actasmregister=NR_NO then
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actasmregister:=std_regnum_search(copy(actasmpattern,2,maxint));
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actasmtoken:=AS_REGISTER;
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end;
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procedure TMipsReader.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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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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actrel:=addr_no;
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case actasmpattern of
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'%CALL_LO':
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actrel:=addr_low_call;
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'%CALL_HI':
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actrel:=addr_high_call;
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'%GOT':
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actrel:=addr_pic;
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'%HIGH':
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actrel:=addr_high;
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'%LO':
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actrel:=addr_low;
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'%CALL16':
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actrel:=addr_pic_call16;
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'%GOT_LO':
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actrel:=addr_low_pic;
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'%GOT_HI':
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actrel:=addr_high_pic;
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else
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Message(asmr_e_invalid_reference_syntax);
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end;
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if actrel<>addr_no then
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actasmtoken:=AS_RELTYPE;
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end;
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Procedure TMipsReader.BuildOperand(oper : TOperand);
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var
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expr : string;
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typesize,l : tcgint;
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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 : tcgint;
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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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mangledname:='';
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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) then
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checklocalsubscript(oper.opr.localsym);
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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,AT_FUNCTION);
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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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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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case oper.opr.typ of
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OPR_NONE:
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begin
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oper.opr.typ:=OPR_CONSTANT;
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oper.opr.val:=l;
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end;
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OPR_CONSTANT :
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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_LOCAL:
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inc(oper.opr.localsymofs,l);
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else
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InternalError(2020100817);
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end;
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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_LPAREN :
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begin
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consume(AS_LPAREN);
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oper.InitRef;
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if actasmtoken=AS_REGISTER then
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oper.opr.ref.base:=actasmregister;
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consume(AS_REGISTER);
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consume(AS_RPAREN);
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gotplus:=false;
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end;
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AS_RELTYPE:
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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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oper.opr.ref.refaddr:=actrel;
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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,tempsymtyp)
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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(2003092006);
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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 not oper.SetupVar(expr,false) then
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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(2003092007);
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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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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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TMipsReader
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*****************************************************************************}
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procedure TMipsReader.BuildOpCode(instr : TInstruction);
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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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{ 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
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}
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if instr.Operands[operandnum].opr.typ<>OPR_NONE then
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Inc(operandnum);
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end;
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Consume(AS_COMMA);
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end;
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AS_SEPARATOR,
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AS_END : { End of asm operands for this opcode }
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begin
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break;
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end;
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else
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BuildOperand(instr.Operands[operandnum] as TOperand);
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end; { end case }
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until false;
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if (operandnum=1) and (instr.Operands[operandnum].opr.typ=OPR_NONE) then
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dec(operandnum);
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instr.Ops:=operandnum;
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end;
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function TMipsReader.is_asmopcode(const s: string):boolean;
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var
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cond:TAsmCond;
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hs:string;
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Begin
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is_asmopcode:=false;
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{ clear op code and condition }
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actopcode:=A_None;
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actcondition:=C_None;
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{ Search opcodes }
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actopcode:=tasmop(PtrUInt(iasmops.Find(s)));
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if actopcode<>A_NONE then
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begin
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actasmtoken:=AS_OPCODE;
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result:=TRUE;
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exit;
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end;
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{ not found, check branch instructions }
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if (Upcase(s[1])='B') then
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begin
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{ we can search here without an extra table which is sorted by string length
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because we take the whole remaining string without the leading B }
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actopcode := A_BC;
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hs:=lower(copy(s,2,maxint));
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for cond:=low(TAsmCond) to high(TAsmCond) do
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if (hs=Cond2Str[cond]) then
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begin
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actasmtoken:=AS_OPCODE;
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actcondition:=cond;
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is_asmopcode:=true;
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end;
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end;
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end;
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procedure TMipsReader.handleopcode;
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var
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instr : TInstruction;
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begin
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instr:=TInstruction.Create(TOperand);
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BuildOpcode(instr);
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with instr do
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begin
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condition := actcondition;
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{ Coprocessor-related instructions have operands referring to both coprocessor registers
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and general-purpose ones. The input representation "$<number>" is the same for both,
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but symbolic names must not be used for non-GPRs on output. }
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if (opcode in [A_MTC0,A_MFC0,A_CFC1,A_CTC1{,A_CFC2,A_CTC2}]) then
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begin
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{ operands are 1-based here }
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if (ops<2) or (operands[2].opr.typ<>OPR_REGISTER) then
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message(asmr_e_syn_operand);
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operands[2].opr.reg:=newreg(R_SPECIALREGISTER,getsupreg(operands[2].opr.reg),R_SUBNONE);
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end;
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ConcatInstruction(curlist);
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Free;
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end;
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end;
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{*****************************************************************************
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Initialize
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*****************************************************************************}
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const
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asmmode_mips_att_info : tasmmodeinfo =
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(
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id : asmmode_standard;
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idtxt : 'GAS';
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casmreader : TMipsReader;
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);
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initialization
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RegisterAsmMode(asmmode_mips_att_info);
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end.
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