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{
Copyright (c) 1998-2000 by Carl Eric Codere
This unit does the parsing process for the motorola 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 ra68kmot;
{$i fpcdefs.inc}
{**********************************************************************}
{ WARNING }
{**********************************************************************}
{ Any modification in the order or removal of terms in the tables }
{ in m68k.pas and asmo68k.pas will BREAK the code in this unit, }
{ unless the appropriate changes are made to this unit. Addition }
{ of terms though, will not change the code herein. }
{**********************************************************************}
{---------------------------------------------------------------------------}
{ LEFT TO DO }
{---------------------------------------------------------------------------}
{ o Add support for sized indexing such as in d0.l }
{ presently only (an,dn) is supported for indexing -- }
{ size defaults to LONG. }
{ o Add support for MC68020 opcodes. }
{ o Add support for MC68020 adressing modes. }
{ o Add operand checking with m68k opcode table in ConcatOpCode }
{ o Add Floating point support }
{---------------------------------------------------------------------------}
interface
uses
cutils,
globtype,cclasses,cpubase,
symconst,
aasmbase,
rabase,rasm,ra68k,rautils;
type
tasmtoken = (
AS_NONE,AS_LABEL,AS_LLABEL,AS_STRING,AS_HEXNUM,AS_OCTALNUM,
AS_BINNUM,AS_COMMA,AS_LBRACKET,AS_RBRACKET,AS_LPAREN,
AS_RPAREN,AS_COLON,AS_DOT,AS_PLUS,AS_MINUS,AS_STAR,AS_INTNUM,
AS_SEPARATOR,AS_ID,AS_REGISTER,AS_OPCODE,AS_SLASH,AS_APPT,AS_REALNUM,
AS_ALIGN,
{------------------ Assembler directives --------------------}
AS_DB,AS_DW,AS_DD,AS_XDEF,AS_END,
{------------------ Assembler Operators --------------------}
AS_MOD,AS_SHL,AS_SHR,AS_NOT,AS_AND,AS_OR,AS_XOR);
tasmtokenset = set of tasmtoken;
tasmkeyword = string[10];
tm68kmotreader = class(tasmreader)
actasmtoken : tasmtoken;
prevasmtoken : tasmtoken;
procedure SetupTables;
function Assemble: tlinkedlist;override;
function is_asmopcode(const s: string) : boolean;
Function is_asmdirective(const s: string):boolean;
function is_register(const s:string):boolean;
procedure GetToken;
function consume(t : tasmtoken):boolean;
function try_to_consume(t : tasmtoken):boolean;
procedure consume_all_until(tokens : tasmtokenset);
function findopcode(const s: string; var opsize: topsize): tasmop;
Function BuildExpression(allow_symbol : boolean; asmsym : pshortstring) : tcgint;
Procedure BuildConstant(maxvalue: tcgint);
Procedure BuildRealConstant(typ : tfloattype);
Procedure BuildScaling(const oper:tm68koperand);
Function BuildRefExpression: tcgint;
procedure BuildReference(const oper:tm68koperand);
procedure BuildRegList(const oper:tm68koperand);
procedure BuildRegPair(const oper:tm68koperand);
Procedure BuildOperand(const oper:tm68koperand);
Procedure BuildOpCode(instr:Tm68kinstruction);
end;
Implementation
uses
{ global }
globals,verbose,
systems,
{ aasm }
cpuinfo,aasmtai,aasmdata,aasmcpu,
cgbase,cgutils,
{ symtable }
symbase,symtype,symsym,symdef,symtable,
{ pass 1 }
nbas,
{ parser }
scanner,ag68kgas,
itcpugas
;
const
firstdirective = AS_DB;
lastdirective = AS_END;
firstoperator = AS_MOD;
lastoperator = AS_XOR;
_count_asmdirectives = longint(lastdirective)-longint(firstdirective);
_count_asmoperators = longint(lastoperator)-longint(firstoperator);
_asmdirectives : array[0.._count_asmdirectives] of tasmkeyword =
('DC.B','DC.W','DC.L','XDEF','END');
{ problems with shl,shr,not,and,or and xor, they are }
{ context sensitive. }
_asmoperators : array[0.._count_asmoperators] of tasmkeyword = (
'MOD','SHL','SHR','NOT','AND','OR','XOR');
token2str : array[tasmtoken] of tasmkeyword=(
'NONE','LABEL','LLABEL','STRING','HEXNUM','OCTALNUM',
'BINNUM',',','[',']','(',
')',':','.','+','-','*','INTNUM',
'SEPARATOR','ID','REGISTER','OPCODE','/','APPT','REALNUM',
'ALIGN',
{------------------ Assembler directives --------------------}
'DB','DW','DD','XDEF','END',
{------------------ Assembler Operators --------------------}
'MOD','SHL','SHR','NOT','AND','OR','XOR');
const
firsttoken : boolean = TRUE;
operandnum : byte = 0;
procedure tm68kmotreader.SetupTables;
{ creates uppercased symbol tables for speed access }
var
i : tasmop;
Begin
{ opcodes }
iasmops:=TFPHashList.create;
for i:=firstop to lastop do
iasmops.Add(upper(gas_op2str[i]),Pointer(PtrInt(i)));
end;
{---------------------------------------------------------------------}
{ Routines for the tokenizing }
{---------------------------------------------------------------------}
function tm68kmotreader.is_asmopcode(const s: string):boolean;
var
hs : string;
j : byte;
begin
is_asmopcode:=false;
{ first of all we remove the suffix }
j:=pos('.',s);
if j>0 then
hs:=copy(s,1,j-1)
else
hs:=s;
{ Search opcodes }
actopcode:=tasmop(PtrUInt(iasmops.Find(hs)));
{ Also filter the helper opcodes, they can't be valid
while reading an assembly source }
if not (actopcode in
[A_NONE, A_LABEL, A_DBXX, A_SXX, A_BXX, A_FBXX]) then
begin
actasmtoken:=AS_OPCODE;
result:=TRUE;
exit;
end;
end;
Function tm68kmotreader.is_asmdirective(const s: string):boolean;
var
i:byte;
begin
result:=false;
for i:=0 to _count_asmdirectives do
begin
if s=_asmdirectives[i] then
begin
actasmtoken := tasmtoken(longint(firstdirective)+i);
result:=true;
exit;
end;
end;
end;
function tm68kmotreader.is_register(const s:string):boolean;
begin
result:=false;
actasmregister:=std_regnum_search(lower(s));
if actasmregister<>NR_NO then
begin
result:=true;
actasmtoken:=AS_REGISTER;
end;
{ reg found?
possible aliases are always 2 char
}
if result or (length(s)<>2) then
exit;
if lower(s)='sp' then
actasmregister:=NR_STACK_POINTER_REG;
if lower(s)='fp' then
actasmregister:=NR_FRAME_POINTER_REG;
if actasmregister<>NR_NO then
begin
result:=true;
actasmtoken:=AS_REGISTER;
end;
end;
Procedure tm68kmotreader.GetToken;
{*********************************************************************}
{ FUNCTION GetToken: tinteltoken; }
{ Description: This routine returns intel assembler tokens and }
{ does some minor syntax error checking. }
{*********************************************************************}
var
token: tasmtoken;
forcelabel: boolean;
begin
c:=scanner.c;
forcelabel := FALSE;
actasmpattern :='';
{* INIT TOKEN TO NOTHING *}
token := AS_NONE;
{ while space and tab , continue scan... }
while c in [' ',#9] do
c:=current_scanner.asmgetchar;
if not (c in [#10,#13,'{',';','(','/']) then
current_scanner.gettokenpos;
{ Possiblities for first token in a statement: }
{ Local Label, Label, Directive, Prefix or Opcode.... }
if firsttoken and not (c in [#10,#13,'{',';','(','/']) then
begin
firsttoken := FALSE;
if c = '@' then
begin
token := AS_LLABEL; { this is a local label }
{ Let us point to the next character }
c := current_scanner.asmgetchar;
end;
while c in ['A'..'Z','a'..'z','0'..'9','_','@','.'] do
begin
{ if there is an at_sign, then this must absolutely be a label }
if c = '@' then forcelabel:=TRUE;
actasmpattern := actasmpattern + c;
c := current_scanner.asmgetchar;
end;
uppervar(actasmpattern);
if c = ':' then
begin
case token of
AS_NONE: token := AS_LABEL;
AS_LLABEL: ; { do nothing }
end; { end case }
{ let us point to the next character }
c := current_scanner.asmgetchar;
actasmtoken := token;
exit;
end;
{ Are we trying to create an identifier with }
{ an at-sign...? }
if forcelabel then
Message(asmr_e_none_label_contain_at);
If is_asmopcode(actasmpattern) then
exit;
if is_asmdirective(actasmpattern) then
exit
else
begin
actasmtoken := AS_NONE;
Message1(asmr_e_invalid_or_missing_opcode,actasmpattern);
end;
end
else { else firsttoken }
{ Here we must handle all possible cases }
begin
case c of
'@': { possiblities : - local label reference , such as in jmp @local1 }
{ - @Result, @Code or @Data special variables. }
begin
actasmpattern := c;
c:= current_scanner.asmgetchar;
while c in ['A'..'Z','a'..'z','0'..'9','_','@','.'] do
begin
actasmpattern := actasmpattern + c;
c := current_scanner.asmgetchar;
end;
uppervar(actasmpattern);
actasmtoken := AS_ID;
exit;
end;
{ identifier, register, opcode, prefix or directive }
'A'..'Z','a'..'z','_': begin
actasmpattern := c;
c:= current_scanner.asmgetchar;
while c in ['A'..'Z','a'..'z','0'..'9','_','.'] do
begin
actasmpattern := actasmpattern + c;
c := current_scanner.asmgetchar;
end;
uppervar(actasmpattern);
{ this isn't the first token, so it can't be an
opcode }
{ Actually, it's possible, since @label: OPCODE foo,bar
is valid and was supported in 0.99/1.0 FPC for 68k,
the amunits package is full of such code. (KB) }
if is_asmopcode(actasmpattern) then
exit;
if is_register(actasmpattern) then
exit;
if is_asmdirective(actasmpattern) then
exit;
{ this is surely an identifier }
actasmtoken := AS_ID;
exit;
end;
{ override operator... not supported }
'&': begin
c:=current_scanner.asmgetchar;
actasmtoken := AS_AND;
end;
{ string or character }
'''' :
begin
actasmpattern:='';
while true do
begin
if c = '''' then
begin
c:=current_scanner.asmgetchar;
if c=#10 then
begin
Message(scan_f_string_exceeds_line);
break;
end;
repeat
if c=''''then
begin
c:=current_scanner.asmgetchar;
if c='''' then
begin
actasmpattern:=actasmpattern+'''';
c:=current_scanner.asmgetchar;
if c=#10 then
begin
Message(scan_f_string_exceeds_line);
break;
end;
end
else break;
end
else
begin
actasmpattern:=actasmpattern+c;
c:=current_scanner.asmgetchar;
if c=#10 then
begin
Message(scan_f_string_exceeds_line);
break
end;
end;
until false; { end repeat }
end
else break; { end if }
end; { end while }
token:=AS_STRING;
actasmtoken := token;
exit;
end;
'$' : begin
c:=current_scanner.asmgetchar;
while c in ['0'..'9','A'..'F','a'..'f'] do
begin
actasmpattern := actasmpattern + c;
c := current_scanner.asmgetchar;
end;
actasmtoken := AS_HEXNUM;
exit;
end;
',' : begin
actasmtoken := AS_COMMA;
c:=current_scanner.asmgetchar;
exit;
end;
'(' : begin
c:=current_scanner.asmgetchar;
if c='*' then
begin
current_scanner.skipoldtpcomment(true);
GetToken;
end
else
actasmtoken:=AS_LPAREN;
exit;
end;
')' : begin
actasmtoken := AS_RPAREN;
c:=current_scanner.asmgetchar;
exit;
end;
':' : begin
actasmtoken := AS_COLON;
c:=current_scanner.asmgetchar;
exit;
end;
{ '.' : begin
actasmtoken := AS_DOT;
c:=current_scanner.asmgetchar;
exit;
end; }
'+' : begin
actasmtoken := AS_PLUS;
c:=current_scanner.asmgetchar;
exit;
end;
'-' : begin
actasmtoken := AS_MINUS;
c:=current_scanner.asmgetchar;
exit;
end;
'*' : begin
actasmtoken := AS_STAR;
c:=current_scanner.asmgetchar;
exit;
end;
'/' : begin
c:=current_scanner.asmgetchar;
if c='/' then
begin
current_scanner.skipdelphicomment;
GetToken;
end
else
actasmtoken := AS_SLASH;
exit;
end;
'<' : begin
c := current_scanner.asmgetchar;
{ invalid characters }
if c <> '<' then
Message(asmr_e_invalid_char_smaller);
{ still assume << }
actasmtoken := AS_SHL;
c := current_scanner.asmgetchar;
exit;
end;
'>' : begin
c := current_scanner.asmgetchar;
{ invalid characters }
if c <> '>' then
Message(asmr_e_invalid_char_greater);
{ still assume << }
actasmtoken := AS_SHR;
c := current_scanner.asmgetchar;
exit;
end;
'|' : begin
actasmtoken := AS_OR;
c := current_scanner.asmgetchar;
exit;
end;
'^' : begin
actasmtoken := AS_XOR;
c := current_scanner.asmgetchar;
exit;
end;
'#' : begin
actasmtoken:=AS_APPT;
c:=current_scanner.asmgetchar;
exit;
end;
'%' : begin
c:=current_scanner.asmgetchar;
while c in ['0','1'] do
begin
actasmpattern := actasmpattern + c;
c := current_scanner.asmgetchar;
end;
actasmtoken := AS_BINNUM;
exit;
end;
{ integer number }
'0'..'9': begin
actasmpattern := c;
c := current_scanner.asmgetchar;
while c in ['0'..'9'] do
begin
actasmpattern := actasmpattern + c;
c:= current_scanner.asmgetchar;
end;
actasmtoken := AS_INTNUM;
exit;
end;
';' : begin
repeat
c:=current_scanner.asmgetchar;
until c=#10;
firsttoken := TRUE;
actasmtoken:=AS_SEPARATOR;
end;
'{' : begin
current_scanner.skipcomment(true);
GetToken;
end;
#13,#10 : begin
current_scanner.linebreak;
c:=current_scanner.asmgetchar;
firsttoken := TRUE;
actasmtoken:=AS_SEPARATOR;
end;
else
current_scanner.illegal_char(c);
end; { end case }
end; { end else if }
end;
{---------------------------------------------------------------------}
{ Routines for the parsing }
{---------------------------------------------------------------------}
function tm68kmotreader.consume(t : tasmtoken):boolean;
begin
Consume:=true;
if t<>actasmtoken then
begin
Message2(scan_f_syn_expected,token2str[t],token2str[actasmtoken]);
Consume:=false;
end;
repeat
gettoken;
until actasmtoken<>AS_NONE;
end;
function tm68kmotreader.try_to_consume(t : tasmtoken):boolean;
begin
try_to_consume:=t=actasmtoken;
if try_to_consume then
Consume(actasmtoken);
end;
procedure tm68kmotreader.consume_all_until(tokens : tasmtokenset);
begin
while not (actasmtoken in tokens) do
Consume(actasmtoken);
end;
function tm68kmotreader.findopcode(const s: string; var opsize: topsize): tasmop;
{*********************************************************************}
{ FUNCTION findopcode(s: string): tasmop; }
{ Description: Determines if the s string is a valid opcode }
{ if so returns correct tasmop token. }
{*********************************************************************}
var
j: longint;
begin
j:=pos('.',s);
if (j <> 0) and (j < length(s)) then
begin
case s[j+1] of
{ For the motorola only opsize size is used to }
{ determine the size of the operands. }
'B': opsize := S_B;
'W': opsize := S_W;
'L': opsize := S_L;
'S': opsize := S_FS;
'D': opsize := S_FD;
'X': opsize := S_FX;
else
Message1(asmr_e_unknown_opcode,s);
end;
end;
result:=actopcode;
end;
Function tm68kmotreader.BuildExpression(allow_symbol : boolean; asmsym : pshortstring) : tcgint;
{*********************************************************************}
{ FUNCTION BuildExpression: tcgint }
{ Description: This routine calculates a constant expression to }
{ a given value. The return value is the value calculated from }
{ the expression. }
{ The following tokens (not strings) are recognized: }
{ (,),SHL,SHR,/,*,NOT,OR,XOR,AND,MOD,+/-,numbers,ID to constants. }
{*********************************************************************}
{ ENTRY: On entry the token should be any valid expression token. }
{ EXIT: On Exit the token points to either COMMA or SEPARATOR }
{ ERROR RECOVERY: Tries to find COMMA or SEPARATOR token by consuming }
{ invalid tokens. }
{*********************************************************************}
var expr: string;
hs, tempstr: string;
sym : tsym;
srsymtable : TSymtable;
hl : tasmlabel;
l : tcgint;
errorflag: boolean;
begin
BuildExpression:=0;
errorflag := FALSE;
expr := '';
tempstr := '';
if allow_symbol then
asmsym^:='';
Repeat
Case actasmtoken of
AS_LPAREN: begin
Consume(AS_LPAREN);
expr := expr + '(';
end;
AS_RPAREN: begin
Consume(AS_RPAREN);
expr := expr + ')';
end;
AS_SHL: begin
Consume(AS_SHL);
expr := expr + '<';
end;
AS_SHR: begin
Consume(AS_SHR);
expr := expr + '>';
end;
AS_SLASH: begin
Consume(AS_SLASH);
expr := expr + '/';
end;
AS_MOD: begin
Consume(AS_MOD);
expr := expr + '%';
end;
AS_STAR: begin
Consume(AS_STAR);
expr := expr + '*';
end;
AS_PLUS: begin
Consume(AS_PLUS);
expr := expr + '+';
end;
AS_MINUS: begin
Consume(AS_MINUS);
expr := expr + '-';
end;
AS_AND: begin
Consume(AS_AND);
expr := expr + '&';
end;
AS_NOT: begin
Consume(AS_NOT);
expr := expr + '~';
end;
AS_XOR: begin
Consume(AS_XOR);
expr := expr + '^';
end;
AS_OR: begin
Consume(AS_OR);
expr := expr + '|';
end;
AS_ID: begin
if SearchIConstant(actasmpattern,l) then
begin
str(l, tempstr);
expr := expr + tempstr;
Consume(AS_ID);
End else
if not allow_symbol then
begin
Message(asmr_e_syn_constant);
l := 0;
End else
begin
hs:='';
if (expr[Length(expr)]='+') then
Delete(expr,Length(expr),1)
else if expr<>'' then
begin
Message(asmr_e_invalid_constant_expression);
break;
End;
tempstr:=actasmpattern;
consume(AS_ID);
if (length(tempstr)>1) and (tempstr[1]='@') then
begin
CreateLocalLabel(tempstr,hl,false);
hs:=hl.name
end
else if SearchLabel(tempstr,hl,false) then
hs:=hl.name
else
begin
asmsearchsym(tempstr,sym,srsymtable);
if assigned(sym) then
begin
case sym.typ of
paravarsym,
localvarsym :
begin
Message(asmr_e_no_local_or_para_allowed);
hs:=tabstractvarsym(sym).mangledname;
end;
staticvarsym :
hs:=tstaticvarsym(sym).mangledname;
procsym :
begin
if tprocsym(sym).procdeflist.count>1 then
Message(asmr_w_calling_overload_func);
hs:=tprocdef(tprocsym(sym).procdeflist[0]).mangledname;
end;
typesym :
begin
if not(ttypesym(sym).typedef.typ in [recorddef,objectdef]) then
Message(asmr_e_wrong_sym_type);
end;
else
Message(asmr_e_wrong_sym_type);
end;
end
else
Message1(sym_e_unknown_id,tempstr);
end;
{ symbol found? }
if hs<>'' then
begin
if asmsym^='' then
asmsym^:=hs
else
Message(asmr_e_cant_have_multiple_relocatable_symbols);
end;
end;
end;
AS_INTNUM: begin
expr := expr + actasmpattern;
Consume(AS_INTNUM);
end;
AS_BINNUM: begin
tempstr := tostr(ParseVal(actasmpattern,2));
if tempstr = '' then
Message(asmr_e_error_converting_binary);
expr:=expr+tempstr;
Consume(AS_BINNUM);
end;
AS_HEXNUM: begin
tempstr := tostr(ParseVal(actasmpattern,16));
if tempstr = '' then
Message(asmr_e_error_converting_hexadecimal);
expr:=expr+tempstr;
Consume(AS_HEXNUM);
end;
AS_OCTALNUM: begin
tempstr := tostr(ParseVal(actasmpattern,8));
if tempstr = '' then
Message(asmr_e_error_converting_octal);
expr:=expr+tempstr;
Consume(AS_OCTALNUM);
end;
{ go to next term }
AS_COMMA: begin
if not ErrorFlag then
BuildExpression := CalculateExpression(expr)
else
BuildExpression := 0;
Exit;
end;
{ go to next symbol }
AS_SEPARATOR: begin
if not ErrorFlag then
BuildExpression := CalculateExpression(expr)
else
BuildExpression := 0;
Exit;
end;
else
begin
{ only write error once. }
if not errorflag then
Message(asmr_e_invalid_constant_expression);
{ consume tokens until we find COMMA or SEPARATOR }
Consume(actasmtoken);
errorflag := TRUE;
End;
end;
Until false;
end;
Procedure tm68kmotreader.BuildRealConstant(typ : tfloattype);
{*********************************************************************}
{ PROCEDURE BuilRealConst }
{ Description: This routine calculates a constant expression to }
{ a given value. The return value is the value calculated from }
{ the expression. }
{ The following tokens (not strings) are recognized: }
{ +/-,numbers and real numbers }
{*********************************************************************}
{ ENTRY: On entry the token should be any valid expression token. }
{ EXIT: On Exit the token points to either COMMA or SEPARATOR }
{ ERROR RECOVERY: Tries to find COMMA or SEPARATOR token by consuming }
{ invalid tokens. }
{*********************************************************************}
var expr: string;
r : extended;
code : word;
negativ : boolean;
errorflag: boolean;
begin
errorflag := FALSE;
Repeat
negativ:=false;
expr := '';
if actasmtoken=AS_PLUS then Consume(AS_PLUS)
else if actasmtoken=AS_MINUS then
begin
negativ:=true;
consume(AS_MINUS);
end;
Case actasmtoken of
AS_INTNUM: begin
expr := actasmpattern;
Consume(AS_INTNUM);
end;
AS_REALNUM: begin
expr := actasmpattern;
{ in ATT syntax you have 0d in front of the real }
{ should this be forced ? yes i think so, as to }
{ conform to gas as much as possible. }
if (expr[1]='0') and (upper(expr[2])='D') then
expr:=copy(expr,3,255);
Consume(AS_REALNUM);
end;
AS_BINNUM: begin
{ checking for real constants with this should use }
{ real DECODING otherwise the compiler will crash! }
Message(asmr_e_invalid_float_expr);
expr:='0.0';
Consume(AS_BINNUM);
end;
AS_HEXNUM: begin
{ checking for real constants with this should use }
{ real DECODING otherwise the compiler will crash! }
Message(asmr_e_invalid_float_expr);
expr:='0.0';
Consume(AS_HEXNUM);
end;
AS_OCTALNUM: begin
{ checking for real constants with this should use }
{ real DECODING otherwise the compiler will crash! }
{ xxxToDec using reals could be a solution, but the }
{ problem is that these will crash the m68k compiler }
{ when compiling -- because of lack of good fpu }
{ support. }
Message(asmr_e_invalid_float_expr);
expr:='0.0';
Consume(AS_OCTALNUM);
end;
else
begin
{ only write error once. }
if not errorflag then
Message(asmr_e_invalid_float_expr);
{ consume tokens until we find COMMA or SEPARATOR }
Consume(actasmtoken);
errorflag := TRUE;
End;
end;
{ go to next term }
if (actasmtoken=AS_COMMA) or (actasmtoken=AS_SEPARATOR) then
begin
if negativ then expr:='-'+expr;
val(expr,r,code);
if code<>0 then
begin
r:=0;
Message(asmr_e_invalid_float_expr);
ConcatRealConstant(curlist,r,typ);
End
else
begin
ConcatRealConstant(curlist,r,typ);
End;
end
else
Message(asmr_e_invalid_float_expr);
Until actasmtoken=AS_SEPARATOR;
end;
Procedure tm68kmotreader.BuildConstant(maxvalue: tcgint);
{*********************************************************************}
{ PROCEDURE BuildConstant }
{ Description: This routine takes care of parsing a DB,DD,or DW }
{ line and adding those to the assembler node. Expressions, range- }
{ checking are fullly taken care of. }
{ maxvalue: $ff -> indicates that this is a DB node. }
{ $ffff -> indicates that this is a DW node. }
{ $ffffffff -> indicates that this is a DD node. }
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to AS_SEPARATOR. }
{*********************************************************************}
var
expr: string;
value : tcgint;
begin
Repeat
Case actasmtoken of
AS_STRING: begin
if maxvalue <> $ff then
Message(asmr_e_string_not_allowed_as_const);
expr := actasmpattern;
if length(expr) > 1 then
Message(asmr_e_string_not_allowed_as_const);
Consume(AS_STRING);
Case actasmtoken of
AS_COMMA: Consume(AS_COMMA);
AS_SEPARATOR: ;
else
Message(asmr_e_invalid_string_expression);
end; { end case }
ConcatString(curlist,expr);
end;
AS_INTNUM,AS_BINNUM,
AS_OCTALNUM,AS_HEXNUM:
begin
value:=BuildExpression(false,nil);
ConcatConstant(curlist,value,maxvalue);
end;
AS_ID:
begin
value:=BuildExpression(false,nil);
if value > maxvalue then
begin
Message(asmr_e_constant_out_of_bounds);
{ assuming a value of maxvalue }
value := maxvalue;
end;
ConcatConstant(curlist,value,maxvalue);
end;
{ These terms can start an assembler expression }
AS_PLUS,AS_MINUS,AS_LPAREN,AS_NOT: begin
value := BuildExpression(false,nil);
ConcatConstant(curlist,value,maxvalue);
end;
AS_COMMA: begin
Consume(AS_COMMA);
END;
AS_SEPARATOR: ;
else
begin
Message(asmr_e_syntax_error);
end;
end; { end case }
Until actasmtoken = AS_SEPARATOR;
end;
Procedure TM68kMotreader.BuildScaling(const oper:tm68koperand);
{*********************************************************************}
{ Takes care of parsing expression starting from the scaling value }
{ up to and including possible field specifiers. }
{ EXIT CONDITION: On exit the routine should point to AS_SEPARATOR }
{ or AS_COMMA. On entry should point to the AS_STAR token. }
{*********************************************************************}
var str:string;
l: longint;
code: integer;
begin
str:='';
Consume(AS_STAR);
if (oper.opr.ref.scalefactor <> 0)
and (oper.opr.ref.scalefactor <> 1) then
Message(asmr_e_wrong_base_index);
case actasmtoken of
AS_INTNUM: str := actasmpattern;
AS_HEXNUM: str := Tostr(ParseVal(actasmpattern,16));
AS_BINNUM: str := Tostr(ParseVal(actasmpattern,2));
AS_OCTALNUM: str := Tostr(ParseVal(actasmpattern,8));
else
Message(asmr_e_syntax_error);
end;
val(str, l, code);
if code <> 0 then
Message(asmr_e_wrong_scale_factor);
if ((l = 2) or (l = 4) or (l = 8) or (l = 1)) and (code = 0) then
begin
oper.opr.ref.scalefactor := l;
end
else
begin
Message(asmr_e_wrong_scale_factor);
oper.opr.ref.scalefactor := 0;
end;
if oper.opr.ref.index = NR_NO then
begin
Message(asmr_e_wrong_base_index);
oper.opr.ref.scalefactor := 0;
end;
{ Consume the scaling number }
Consume(actasmtoken);
if actasmtoken = AS_RPAREN then
Consume(AS_RPAREN)
else
Message(asmr_e_wrong_scale_factor);
{ // .Field.Field ... or separator/comma // }
if actasmtoken in [AS_COMMA,AS_SEPARATOR] then
begin
end
else
Message(asmr_e_syntax_error);
end;
Function TM68kMotreader.BuildRefExpression: tcgint;
{*********************************************************************}
{ FUNCTION BuildRefExpression: tcgint }
{ Description: This routine calculates a constant expression to }
{ a given value. The return value is the value calculated from }
{ the expression. }
{ The following tokens (not strings) are recognized: }
{ SHL,SHR,/,*,NOT,OR,XOR,AND,MOD,+/-,numbers,ID to constants. }
{*********************************************************************}
{ ENTRY: On entry the token should be any valid expression token. }
{ EXIT: On Exit the token points to the LPAREN token. }
{ ERROR RECOVERY: Tries to find COMMA or SEPARATOR token by consuming }
{ invalid tokens. }
{*********************************************************************}
var
tempstr: string;
expr: string;
l : tcgint;
errorflag : boolean;
begin
BuildRefExpression := 0;
errorflag := FALSE;
expr := '';
repeat
tempstr := '';
case actasmtoken of
AS_RPAREN:
Message(asmr_e_syntax_error);
AS_SHL:
tempstr := '<';
AS_SHR:
tempstr := '>';
AS_SLASH:
tempstr := '/';
AS_MOD:
tempstr := '%';
AS_STAR:
tempstr := '*';
AS_PLUS:
tempstr := '+';
AS_MINUS:
tempstr := '-';
AS_AND:
tempstr := '&';
AS_NOT:
tempstr := '~';
AS_XOR:
tempstr := '^';
AS_OR:
tempstr := '|';
{ End of reference }
AS_LPAREN:
begin
if not ErrorFlag then
BuildRefExpression := CalculateExpression(expr);
{ no longer in an expression }
exit;
end;
AS_ID:
begin
if not SearchIConstant(actasmpattern,l) then
begin
Message(asmr_e_syn_constant);
l := 0;
end;
str(l, tempstr);
end;
AS_INTNUM:
tempstr := actasmpattern;
AS_BINNUM:
begin
tempstr := Tostr(ParseVal(actasmpattern,2));
if tempstr = '' then
Message(asmr_e_error_converting_binary);
end;
AS_HEXNUM:
begin
tempstr := Tostr(ParseVal(actasmpattern,16));
if tempstr = '' then
Message(asmr_e_error_converting_hexadecimal);
end;
AS_OCTALNUM:
begin
tempstr := Tostr(ParseVal(actasmpattern,8));
if tempstr = '' then
Message(asmr_e_error_converting_octal);
end;
else
begin
{ write error only once. }
if not errorflag then
Message(asmr_e_invalid_constant_expression);
if actasmtoken in [AS_COMMA,AS_SEPARATOR] then exit;
{ consume tokens until we find COMMA or SEPARATOR }
errorflag := true;
end;
end;
if tempstr <> '' then
expr := expr + tempstr;
Consume(actasmtoken);
until false;
end;
{*********************************************************************}
{ PROCEDURE BuildBracketExpression }
{ Description: This routine builds up an expression after a LPAREN }
{ token is encountered. }
{ On entry actasmtoken should be equal to AS_LPAREN }
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to either the }
{ AS_COMMA or AS_SEPARATOR token. }
{*********************************************************************}
procedure TM68kMotreader.BuildReference(const oper:tm68koperand);
var
l:tcgint;
code: integer;
str: string;
begin
str:='';
Consume(AS_LPAREN);
case actasmtoken of
{ // (reg ... // }
AS_REGISTER:
begin
oper.opr.ref.base := actasmregister;
Consume(AS_REGISTER);
{ can either be a register or a right parenthesis }
{ // (reg) // }
{ // (reg)+ // }
if actasmtoken=AS_RPAREN then
begin
Consume(AS_RPAREN);
if actasmtoken = AS_PLUS then
begin
if (oper.opr.ref.direction <> dir_none) then
Message(asmr_e_no_inc_and_dec_together)
else
oper.opr.ref.direction := dir_inc;
Consume(AS_PLUS);
end;
if not (actasmtoken in [AS_COMMA,AS_SEPARATOR]) then
begin
Message(asmr_e_invalid_reference_syntax);
{ error recovery ... }
while actasmtoken <> AS_SEPARATOR do
Consume(actasmtoken);
end;
exit;
end;
{ // (reg,reg .. // }
Consume(AS_COMMA);
if actasmtoken = AS_REGISTER then
begin
oper.opr.ref.index :=
actasmregister;
Consume(AS_REGISTER);
{ check for scaling ... }
case actasmtoken of
AS_RPAREN:
begin
Consume(AS_RPAREN);
if not (actasmtoken in [AS_COMMA,AS_SEPARATOR]) then
begin
{ error recovery ... }
Message(asmr_e_invalid_reference_syntax);
while actasmtoken <> AS_SEPARATOR do
Consume(actasmtoken);
end;
exit;
end;
AS_STAR:
begin
BuildScaling(oper);
end;
else
begin
Message(asmr_e_invalid_reference_syntax);
while (actasmtoken <> AS_SEPARATOR) do
Consume(actasmtoken);
end;
end; { end case }
end
else
begin
Message(asmr_e_invalid_reference_syntax);
while (actasmtoken <> AS_SEPARATOR) do
Consume(actasmtoken);
end;
end;
AS_HEXNUM,AS_OCTALNUM, { direct address }
AS_BINNUM,AS_INTNUM:
begin
case actasmtoken of
AS_INTNUM: str := actasmpattern;
AS_HEXNUM: str := Tostr(ParseVal(actasmpattern,16));
AS_BINNUM: str := Tostr(ParseVal(actasmpattern,2));
AS_OCTALNUM: str := Tostr(ParseVal(actasmpattern,8));
else
Message(asmr_e_syntax_error);
end;
Consume(actasmtoken);
val(str, l, code);
if code <> 0 then
Message(asmr_e_invalid_reference_syntax)
else
oper.opr.ref.offset := l;
Consume(AS_RPAREN);
if not (actasmtoken in [AS_COMMA,AS_SEPARATOR]) then
begin
{ error recovery ... }
Message(asmr_e_invalid_reference_syntax);
while actasmtoken <> AS_SEPARATOR do
Consume(actasmtoken);
end;
exit;
end;
else
begin
Message(asmr_e_invalid_reference_syntax);
while (actasmtoken <> AS_SEPARATOR) do
Consume(actasmtoken);
end;
end;
end;
procedure tm68kmotreader.BuildRegList(const oper:tm68koperand);
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to either the }
{ AS_COMMA or AS_SEPARATOR token. }
{*********************************************************************}
var
i: Tsuperregister;
reg_one, reg_two: tregister;
rs_one, rs_two: tsuperregister;
addrregset,dataregset,fpuregset: tcpuregisterset;
errorflag, first: boolean;
begin
dataregset := [];
addrregset := [];
fpuregset := [];
{ 1., try to consume a register list
2., if successful, add the register list
3., if not possible, then we have a standalone register, add
4., repeat until we dont have a slash any more }
errorflag:=false;
first:=true;
repeat
reg_one:=actasmregister;
rs_one:=getsupreg(reg_one);
if not (first or try_to_consume(AS_REGISTER)) then
begin
errorflag:=true;
break;
end;
first:=false;
{ try to consume a register list }
if try_to_consume(AS_MINUS) then
begin
reg_two:=actasmregister;
rs_two:=getsupreg(reg_two);
if (not try_to_consume(AS_REGISTER)) or
(rs_one >= rs_two) or
(getregtype(reg_one) <> getregtype(reg_two)) then
begin
errorflag:=true;
break;
end;
end
else
begin
{ nope, we have a single element "list" }
reg_two:=reg_one;
rs_two:=getsupreg(reg_two);
end;
case getregtype(reg_one) of
R_INTREGISTER:
for i:=getsupreg(reg_one) to getsupreg(reg_two) do
include(dataregset,i);
R_ADDRESSREGISTER:
for i:=getsupreg(reg_one) to getsupreg(reg_two) do
include(addrregset,i);
R_FPUREGISTER:
for i:=getsupreg(reg_one) to getsupreg(reg_two) do
include(fpuregset,i);
else
internalerror(201611041);
end;
until not try_to_consume(AS_SLASH);
errorflag:=errorflag or
(((dataregset <> []) or (addrregset <> [])) and (fpuregset <> [])) or
(not (actasmtoken in [AS_SEPARATOR,AS_COMMA]));
if errorflag then
begin
Message(asmr_e_invalid_reg_list_in_movem_or_fmovem);
consume_all_until([AS_SEPARATOR,AS_COMMA]);
end
else
begin
oper.opr.typ:= OPR_REGSET;
oper.opr.regsetdata := dataregset;
oper.opr.regsetaddr := addrregset;
oper.opr.regsetfpu := fpuregset;
end;
end;
procedure tm68kmotreader.BuildRegPair(const oper:tm68koperand);
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to either the }
{ AS_COMMA or AS_SEPARATOR token. }
{*********************************************************************}
begin
oper.opr.typ := OPR_REGPAIR;
oper.opr.reghi := actasmregister;
Consume(AS_COLON);
if not try_to_consume(AS_REGISTER) then
begin
Message(asmr_e_invalid_reg_list_for_opcode);
consume_all_until([AS_SEPARATOR,AS_COMMA]);
end
else
oper.opr.reglo:=actasmregister;
end;
Procedure TM68kMotreader.BuildOperand(const oper:tm68koperand);
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to either the }
{ AS_COMMA or AS_SEPARATOR token. }
{*********************************************************************}
var
expr: string;
tempstr: string;
lab: tasmlabel;
l : tcgint;
hl: tasmlabel;
p: pointer;
begin
case actasmtoken of
{ // Memory reference // }
AS_LPAREN:
begin
Oper.InitRef;
BuildReference(oper);
end;
{ // Constant expression // }
AS_APPT: begin
Consume(AS_APPT);
if not (oper.opr.typ in [OPR_NONE,OPR_CONSTANT]) then
Message(asmr_e_invalid_operand_type);
{ identifiers are handled by BuildExpression }
oper.opr.typ := OPR_CONSTANT;
l:=BuildExpression(true,@tempstr);
oper.opr.val :=aint(l);
if tempstr<>'' then
begin
l:=oper.opr.val;
oper.opr.typ := OPR_SYMBOL;
oper.opr.symofs := l;
oper.opr.symbol := current_asmdata.RefAsmSymbol(tempstr,AT_FUNCTION);
end;
end;
{ // Constant memory offset . // }
{ // This must absolutely be followed by ( // }
AS_HEXNUM,AS_INTNUM,
AS_BINNUM,AS_OCTALNUM,AS_PLUS:
begin
Oper.InitRef;
oper.opr.ref.offset:=BuildRefExpression;
BuildReference(oper);
end;
{ // A constant expression, or a Variable ref. // }
AS_ID: begin
if actasmpattern[1] = '@' then
{ // Label or Special symbol reference // }
begin
if actasmpattern = '@RESULT' then
oper.SetUpResult
else
if actasmpattern = 'SELF' then
oper.SetUpSelf
else
if (actasmpattern = '@CODE') or (actasmpattern = '@DATA') then
Message(asmr_w_CODE_and_DATA_not_supported)
else
begin
delete(actasmpattern,1,1);
if actasmpattern = '' then
Message(asmr_e_null_label_ref_not_allowed);
CreateLocalLabel(actasmpattern,lab,false);
oper.opr.typ := OPR_SYMBOL;
oper.opr.symbol := lab;
oper.opr.symofs := 0;
end;
Consume(AS_ID);
if not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) then
Message(asmr_e_syntax_error);
end
{ probably a variable or normal expression }
{ or a procedure (such as in CALL ID) }
else
begin
{ is it a constant ? }
if SearchIConstant(actasmpattern,l) then
begin
Oper.InitRef;
oper.opr.ref.offset:=BuildRefExpression;
BuildReference(oper);
end
else { is it a label variable ? }
{ // ID[ , ID.Field.Field or simple ID // }
{ check if this is a label, if so then }
{ emit it as a label. }
if SearchLabel(actasmpattern,hl,false) then
begin
oper.opr.typ := OPR_SYMBOL;
oper.opr.symbol := hl;
oper.opr.symofs := 0;
Consume(AS_ID);
if not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) then
Message(asmr_e_syntax_error);
end
else begin
expr:=actasmpattern;
Consume(AS_ID);
{ typecasting? }
if SearchType(expr,l) then
begin
oper.hastype:=true;
oper.typesize:=l;
case actasmtoken of
AS_LPAREN :
begin
{ Support Type([Reference]) }
Consume(AS_LPAREN);
BuildOperand(oper{,true});
Consume(AS_RPAREN);
end;
AS_LBRACKET :
begin
{ Support Var.Type[Index] }
{ Convert @label.Byte[1] to reference }
if oper.opr.typ=OPR_SYMBOL then
oper.initref;
end;
end;
end
else
begin
if not oper.SetupVar(expr,false) then
begin
{ not a variable, check special variables.. }
if expr = 'SELF' then
oper.SetupSelf
else begin
Message1(sym_e_unknown_id,expr);
end;
expr:='';
end;
end;
// Message1(sym_e_unknown_id,actasmpattern);
end;
case actasmtoken of
AS_LPAREN: { indexing }
BuildReference(oper);
AS_SEPARATOR,AS_COMMA: begin
end;
else
Message(asmr_e_syntax_error);
end;
end;
end;
{ // Pre-decrement mode reference or constant mem offset. // }
AS_MINUS: begin
Consume(AS_MINUS);
if actasmtoken = AS_LPAREN then
begin
Oper.InitRef;
{ indicate pre-decrement mode }
oper.opr.ref.direction := dir_dec;
BuildReference(oper);
end
else
if actasmtoken in [AS_OCTALNUM,AS_HEXNUM,AS_BINNUM,AS_INTNUM] then
begin
Oper.InitRef;
oper.opr.ref.offset:=BuildRefExpression;
{ negate because was preceded by a negative sign! }
oper.opr.ref.offset:=-oper.opr.ref.offset;
BuildReference(oper);
end
else
begin
Message(asmr_e_syntax_error);
while not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) do
Consume(actasmtoken);
end;
end;
{ // Register, a variable reference or a constant reference // }
AS_REGISTER: begin
Consume(AS_REGISTER);
case actasmtoken of
AS_SEPARATOR, AS_COMMA:
begin
{ // Simple register // }
if not (oper.opr.typ in [OPR_NONE,OPR_REGISTER]) then
Message(asmr_e_invalid_operand_type);
oper.opr.typ := OPR_REGISTER;
oper.opr.reg := actasmregister;
end;
AS_SLASH, AS_MINUS:
{ // Register listing // }
BuildRegList(oper);
AS_COLON:
{ // Register pair // }
BuildRegPair(oper);
else
Message(asmr_e_invalid_register);
end;
end;
AS_SEPARATOR, AS_COMMA: ;
else
begin
Message(asmr_e_invalid_opcode_and_operand);
Consume(actasmtoken);
end;
end; { end case }
end;
Procedure TM68kmotReader.BuildOpCode(instr:Tm68kinstruction);
{*********************************************************************}
{ PROCEDURE BuildOpcode; }
{ Description: Parses the intel opcode and operands, and writes it }
{ in the TInstruction object. }
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to AS_SEPARATOR. }
{ On ENTRY: Token should point to AS_OPCODE }
{*********************************************************************}
var
operandnum : longint;
begin
{ // opcode // }
{ allow for newline as in gas styled syntax }
{ under DOS you get two AS_SEPARATOR !! }
while actasmtoken=AS_SEPARATOR do
Consume(AS_SEPARATOR);
if (actasmtoken <> AS_OPCODE) then
begin
Message(asmr_e_invalid_or_missing_opcode);
{ error recovery }
While not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) do
Consume(actasmtoken);
exit;
end
else
begin
Instr.opcode := findopcode(actasmpattern,instr.opsize);
Consume(AS_OPCODE);
{ // Zero operand opcode ? // }
if actasmtoken = AS_SEPARATOR then
exit
else
operandnum := 1;
end;
While actasmtoken <> AS_SEPARATOR do
begin
case actasmtoken of
{ // Operand delimiter // }
AS_COMMA: begin
if operandnum > Max_Operands then
Message(asmr_e_too_many_operands)
else
Inc(operandnum);
Consume(AS_COMMA);
end;
{ // End of asm operands for this opcode // }
AS_SEPARATOR: ;
else
BuildOperand(Instr.Operands[operandnum] as tm68koperand);
end; { end case }
end; { end while }
instr.Ops:=operandnum;
end;
function tm68kmotreader.Assemble: tlinkedlist;
var
hl: tasmlabel;
instr : TM68kInstruction;
begin
//Message(asmr_d_start_reading);
firsttoken := TRUE;
operandnum := 0;
{ sets up all opcode and register tables in uppercase }
if not _asmsorted then
begin
SetupTables;
_asmsorted := TRUE;
end;
curlist:=TAsmList.Create;
gettoken;
while actasmtoken<>AS_END do
begin
case actasmtoken of
AS_LLABEL:
begin
if CreateLocalLabel(actasmpattern,hl,true) then
ConcatLabel(curlist,hl);
Consume(AS_LLABEL);
end;
AS_LABEL:
begin
{ when looking for Pascal labels, these must }
{ be in uppercase. }
if SearchLabel(upper(actasmpattern),hl,true) then
ConcatLabel(curlist,hl)
else
Message1(asmr_e_unknown_label_identifier,actasmpattern);
Consume(AS_LABEL);
end;
AS_DW:
begin
Consume(AS_DW);
BuildConstant($ffff);
end;
AS_DB:
begin
Consume(AS_DB);
BuildConstant($ff);
end;
AS_DD:
begin
Consume(AS_DD);
BuildConstant(tcgint($ffffffff));
end;
AS_XDEF:
begin
Consume(AS_XDEF);
if actasmtoken=AS_ID then
ConcatPublic(curlist,actasmpattern);
Consume(AS_ID);
if actasmtoken<>AS_SEPARATOR then
Consume(AS_SEPARATOR);
end;
AS_ALIGN:
begin
Message(asmr_w_align_not_supported);
while actasmtoken <> AS_SEPARATOR do
Consume(actasmtoken);
end;
AS_OPCODE:
begin
instr:=TM68kInstruction.Create(tm68koperand);
BuildOpcode(instr);
// instr.AddReferenceSizes;
// instr.SetInstructionOpsize;
// instr.CheckOperandSizes;
if instr.labeled then
instr.ConcatLabeledInstr(curlist)
else begin
instr.ConcatInstruction(curlist);
end;
instr.Free;
end;
AS_SEPARATOR:
begin
Consume(AS_SEPARATOR);
{ let us go back to the first operand }
operandnum := 0;
end;
AS_END:
{ end assembly block }
;
else
begin
Message(asmr_e_syntax_error);
{ error recovery }
Consume(actasmtoken);
end;
end; { end case }
end; { end while }
{ Check LocalLabelList }
checklocallabels;
assemble:=curlist;
//Message(asmr_d_finish_reading);
end;
{*****************************************************************************
Initialize
*****************************************************************************}
const
asmmode_m68k_mot_info : tasmmodeinfo =
(
id : asmmode_m68k_mot;
idtxt : 'MOTOROLA';
casmreader : tm68kmotreader;
);
asmmode_m68k_standard_info : tasmmodeinfo =
(
id : asmmode_standard;
idtxt : 'STANDARD';
casmreader : tm68kmotreader;
);
begin
RegisterAsmMode(asmmode_m68k_mot_info);
RegisterAsmMode(asmmode_m68k_standard_info);
end.