{
Copyright (c) 1998-2002 by Mazen NEIFER
Does the parsing for the i386 GNU AS styled inline assembler.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
Unit racpugas;
{$i fpcdefs.inc}
Interface
uses
raatt,racpu;
type
tSparcReader = class(tattreader)
function is_asmopcode(const s: string):boolean;override;
procedure handleopcode;override;
procedure BuildReference(oper : tSparcoperand);
procedure BuildOperand(oper : tSparcoperand);
procedure BuildOpCode(instr : tSparcinstruction);
procedure ReadPercent(oper : tSparcoperand);
procedure ReadSym(oper : tSparcoperand);
procedure ConvertCalljmp(instr : tSparcinstruction);
procedure handlepercent;override;
end;
Implementation
uses
{ helpers }
cutils,
{ global }
globtype,verbose,
systems,
{ aasm }
cpubase,aasmbase,aasmtai,aasmdata,aasmcpu,
{ symtable }
symconst,symsym,
{ parser }
scanner,
procinfo,
rabase,rautils,
cgbase,cgobj
;
procedure TSparcReader.ReadSym(oper : tSparcoperand);
var
tempstr, mangledname : string;
typesize,l,k : aint;
begin
tempstr:=actasmpattern;
Consume(AS_ID);
{ typecasting? }
if (actasmtoken=AS_LPAREN) and
SearchType(tempstr,typesize) then
begin
oper.hastype:=true;
Consume(AS_LPAREN);
BuildOperand(oper);
Consume(AS_RPAREN);
if oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL] then
oper.SetSize(typesize,true);
end
else
if not oper.SetupVar(tempstr,false) then
Message1(sym_e_unknown_id,tempstr);
{ record.field ? }
if actasmtoken=AS_DOT then
begin
BuildRecordOffsetSize(tempstr,l,k,mangledname,false);
if (mangledname<>'') then
Message(asmr_e_invalid_reference_syntax);
inc(oper.opr.ref.offset,l);
end;
end;
procedure TSparcReader.ReadPercent(oper : tSparcoperand);
begin
{ check for ...@ }
if actasmtoken=AS_AT then
begin
if (oper.opr.ref.symbol=nil) and
(oper.opr.ref.offset = 0) then
Message(asmr_e_invalid_reference_syntax);
Consume(AS_AT);
if actasmtoken=AS_ID then
begin
if upper(actasmpattern)='LO' then
oper.opr.ref.refaddr:=addr_lo
else if upper(actasmpattern)='HI' then
oper.opr.ref.refaddr:=addr_hi
else
Message(asmr_e_invalid_reference_syntax);
Consume(AS_ID);
end
else
Message(asmr_e_invalid_reference_syntax);
end;
end;
Procedure TSparcReader.BuildReference(oper : tSparcoperand);
var
l : aint;
regs : byte;
hasimm : boolean;
begin
oper.initref;
regs:=0;
hasimm:=false;
Consume(AS_LBRACKET);
repeat
Case actasmtoken of
AS_INTNUM,
AS_MINUS,
AS_PLUS:
Begin
if hasimm or (regs>1) then
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(true);
break;
End;
oper.opr.Ref.Offset:=BuildConstExpression(false,true);
hasimm:=true;
End;
AS_REGISTER:
Begin
if regs<2 then
begin
if regs=0 then
oper.opr.ref.base:=actasmregister
else
oper.opr.ref.index:=actasmregister;
inc(regs);
end
else
begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(true);
break;
end;
Consume(AS_REGISTER);
end;
AS_ID:
Begin
l:=BuildConstExpression(true,true);
inc(oper.opr.ref.offset,l);
End;
AS_RBRACKET:
begin
if (regs=0) and (not hasimm) then
Message(asmr_e_invalid_reference_syntax);
Consume(AS_RBRACKET);
break;
end;
else
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(false);
break;
end;
end;
until false;
end;
procedure TSparcReader.handlepercent;
var
len : longint;
begin
len:=1;
actasmpattern[len]:='%';
c:=current_scanner.asmgetchar;
{ to be a register there must be a letter and not a number }
while c in ['a'..'z','A'..'Z','0'..'9'] do
Begin
inc(len);
actasmpattern[len]:=c;
c:=current_scanner.asmgetchar;
end;
actasmpattern[0]:=chr(len);
uppervar(actasmpattern);
if is_register(actasmpattern) then
exit;
if (actasmpattern='%HI') then
actasmtoken:=AS_HI
else if (actasmpattern='%LO')then
actasmtoken:=AS_LO
else
Message(asmr_e_invalid_register);
end;
Procedure TSparcReader.BuildOperand(oper : tSparcoperand);
var
expr : string;
typesize,l : aint;
procedure AddLabelOperand(hl:tasmlabel);
begin
if not(actasmtoken in [AS_PLUS,AS_MINUS,AS_LPAREN]) and
is_calljmp(actopcode) then
begin
oper.opr.typ:=OPR_SYMBOL;
oper.opr.symbol:=hl;
end
else
begin
oper.InitRef;
oper.opr.ref.symbol:=hl;
end;
end;
procedure MaybeRecordOffset;
var
mangledname: string;
hasdot : boolean;
l,
toffset,
tsize : aint;
begin
if not(actasmtoken in [AS_DOT,AS_PLUS,AS_MINUS]) then
exit;
l:=0;
hasdot:=(actasmtoken=AS_DOT);
if hasdot then
begin
if expr<>'' then
begin
BuildRecordOffsetSize(expr,toffset,tsize,mangledname,false);
if (oper.opr.typ<>OPR_CONSTANT) and
(mangledname<>'') then
Message(asmr_e_wrong_sym_type);
inc(l,toffset);
oper.SetSize(tsize,true);
end;
end;
if actasmtoken in [AS_PLUS,AS_MINUS] then
inc(l,BuildConstExpression(true,false));
case oper.opr.typ of
OPR_LOCAL :
begin
{ don't allow direct access to fields of parameters, because that
will generate buggy code. Allow it only for explicit typecasting }
if hasdot and
(not oper.hastype) and
(tabstractnormalvarsym(oper.opr.localsym).owner.symtabletype=parasymtable) and
(current_procinfo.procdef.proccalloption<>pocall_register) then
Message(asmr_e_cannot_access_field_directly_for_parameters);
inc(oper.opr.localsymofs,l)
end;
OPR_CONSTANT :
if (mangledname<>'') then
begin
if (oper.opr.val<>0) then
Message(asmr_e_wrong_sym_type);
oper.opr.typ:=OPR_SYMBOL;
oper.opr.symbol:=current_asmdata.RefAsmSymbol(mangledname);
end
else
inc(oper.opr.val,l);
OPR_REFERENCE :
inc(oper.opr.ref.offset,l);
OPR_SYMBOL:
Message(asmr_e_invalid_symbol_ref);
else
internalerror(200309221);
end;
end;
var
tempreg : tregister;
tempstr : string;
tempsymtyp : TAsmSymType;
hl : tasmlabel;
gotplus,
negative : boolean;
Begin
expr:='';
gotplus:=true;
negative:=false;
repeat
case actasmtoken of
AS_MINUS :
begin
consume(AS_MINUS);
negative:=true;
gotplus:=true;
end;
AS_PLUS :
begin
consume(AS_PLUS);
negative:=false;
gotplus:=true;
end;
AS_INTNUM,
AS_MOD:
Begin
if not gotplus then
Message(asmr_e_invalid_reference_syntax);
l:=BuildConstExpression(True,False);
if negative then
l:=-l;
{ Constant memory offset }
oper.InitRef;
oper.opr.ref.refaddr:=addr_full;
oper.opr.ref.offset:=l;
GotPlus:=(prevasmtoken=AS_PLUS) or
(prevasmtoken=AS_MINUS);
if GotPlus then
negative:=(prevasmtoken=AS_MINUS);
end;
AS_LBRACKET :
begin
{ memory reference }
BuildReference(oper);
gotplus:=false;
end;
AS_HI,
AS_LO:
begin
{ Low or High part of a constant (or constant
memory location) }
oper.InitRef;
if actasmtoken=AS_LO then
oper.opr.ref.refaddr:=addr_lo
else
oper.opr.ref.refaddr:=addr_hi;
Consume(actasmtoken);
Consume(AS_LPAREN);
BuildConstSymbolExpression(false, true,false,l,tempstr,tempsymtyp);
if not assigned(oper.opr.ref.symbol) then
oper.opr.ref.symbol:=current_asmdata.RefAsmSymbol(tempstr)
else
Message(asmr_e_cant_have_multiple_relocatable_symbols);
case oper.opr.typ of
OPR_CONSTANT :
inc(oper.opr.val,l);
OPR_LOCAL :
inc(oper.opr.localsymofs,l);
OPR_REFERENCE :
inc(oper.opr.ref.offset,l);
else
internalerror(200309202);
end;
Consume(AS_RPAREN);
gotplus:=false;
end;
AS_ID: { A constant expression, or a Variable ref. }
Begin
{ Local Label ? }
if is_locallabel(actasmpattern) then
begin
CreateLocalLabel(actasmpattern,hl,false);
Consume(AS_ID);
AddLabelOperand(hl);
end
else
{ Check for label }
if SearchLabel(actasmpattern,hl,false) then
begin
Consume(AS_ID);
AddLabelOperand(hl);
end
else
{ probably a variable or normal expression }
{ or a procedure (such as in CALL ID) }
Begin
{ is it a constant ? }
if SearchIConstant(actasmpattern,l) then
Begin
if not (oper.opr.typ in [OPR_NONE,OPR_CONSTANT]) then
Message(asmr_e_invalid_operand_type);
BuildConstantOperand(oper);
end
else
begin
expr:=actasmpattern;
Consume(AS_ID);
{ typecasting? }
if (actasmtoken=AS_LPAREN) and
SearchType(expr,typesize) then
begin
oper.hastype:=true;
Consume(AS_LPAREN);
BuildOperand(oper);
Consume(AS_RPAREN);
if oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL] then
oper.SetSize(typesize,true);
end
else
begin
if oper.SetupVar(expr,false) then
ReadPercent(oper)
else
Begin
{ look for special symbols ... }
if expr= '__HIGH' then
begin
consume(AS_LPAREN);
if not oper.setupvar('high'+actasmpattern,false) then
Message1(sym_e_unknown_id,'high'+actasmpattern);
consume(AS_ID);
consume(AS_RPAREN);
end
else
if expr = '__RESULT' then
oper.SetUpResult
else
if expr = '__SELF' then
oper.SetupSelf
else
if expr = '__OLDEBP' then
oper.SetupOldEBP
else
Message1(sym_e_unknown_id,expr);
end;
end;
end;
if actasmtoken=AS_DOT then
MaybeRecordOffset;
{ add a constant expression? }
if (actasmtoken=AS_PLUS) then
begin
l:=BuildConstExpression(true,false);
case oper.opr.typ of
OPR_CONSTANT :
inc(oper.opr.val,l);
OPR_LOCAL :
inc(oper.opr.localsymofs,l);
OPR_REFERENCE :
inc(oper.opr.ref.offset,l);
else
internalerror(200309202);
end;
end
end;
gotplus:=false;
end;
AS_REGISTER: { Register, a variable reference or a constant reference }
Begin
{ save the type of register used. }
tempreg:=actasmregister;
Consume(AS_REGISTER);
if (oper.opr.typ in [OPR_REGISTER,OPR_REFERENCE]) and gotplus then
begin
oper.initref;
oper.opr.ref.refaddr:=addr_full;
if oper.opr.ref.base<>NR_NO then
oper.opr.ref.base:=tempreg
else
if oper.opr.ref.index<>NR_NO then
oper.opr.ref.index:=tempreg
else
Message(asmr_e_multiple_index);
end
else
begin
if (oper.opr.typ<>OPR_NONE) then
Message(asmr_e_invalid_operand_type);
oper.opr.typ:=OPR_REGISTER;
oper.opr.reg:=tempreg;
end;
gotplus:=false;
end;
AS_END,
AS_SEPARATOR,
AS_COMMA:
break;
else
Begin
Message(asmr_e_syn_operand);
Consume(actasmtoken);
end;
end; { end case }
until false;
end;
{*****************************************************************************
TSparcReader
*****************************************************************************}
procedure TSparcReader.BuildOpCode(instr : tSparcinstruction);
var
operandnum : longint;
Begin
{ opcode }
if (actasmtoken<>AS_OPCODE) then
Begin
Message(asmr_e_invalid_or_missing_opcode);
RecoverConsume(true);
exit;
end;
{ Fill the instr object with the current state }
with instr do
begin
Opcode:=ActOpcode;
condition:=ActCondition;
end;
{ We are reading operands, so opcode will be an AS_ID }
operandnum:=1;
Consume(AS_OPCODE);
{ Zero operand opcode ? }
if actasmtoken in [AS_SEPARATOR,AS_END] then
begin
operandnum:=0;
exit;
end;
{ delayslot annulled? }
if (actasmtoken=AS_COMMA) then
begin
consume(AS_COMMA);
if actasmpattern='A' then
instr.delayslot_annulled:=true;
{ force reading of AS_COMMA instead of AS_ID, otherwise
a label .L0 will first read a AS_DOT instead of AS_ID }
actasmtoken:=AS_COMMA;
consume(AS_COMMA);
end;
{ Read the operands }
repeat
case actasmtoken of
AS_COMMA: { Operand delimiter }
Begin
if operandnum>Max_Operands then
Message(asmr_e_too_many_operands)
else
begin
{ condition operands doesn't set the operand but write to the
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(PtrInt(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.
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