{
Copyright (c) 1998-2002 by Carl Eric Codere and Peter Vreman
Does the parsing process for the intel 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 Rax86int;
{$i fpcdefs.inc}
interface
uses
cclasses,
cpubase,
globtype,
aasmbase,
rasm,
rax86;
type
tasmtoken = (
AS_NONE,AS_LABEL,AS_LLABEL,AS_STRING,AS_INTNUM,
AS_COMMA,AS_LBRACKET,AS_RBRACKET,AS_LPAREN,
AS_RPAREN,AS_COLON,AS_DOT,AS_PLUS,AS_MINUS,AS_STAR,
AS_SEPARATOR,AS_ID,AS_REGISTER,AS_OPCODE,AS_SLASH,
{------------------ Assembler directives --------------------}
AS_ALIGN,AS_DB,AS_DW,AS_DD,AS_END,
{------------------ Assembler Operators --------------------}
AS_BYTE,AS_WORD,AS_DWORD,AS_QWORD,AS_TBYTE,AS_DQWORD,AS_NEAR,AS_FAR,
AS_HIGH,AS_LOW,AS_OFFSET,AS_SIZEOF,AS_VMTOFFSET,AS_SEG,AS_TYPE,AS_PTR,AS_MOD,AS_SHL,AS_SHR,AS_NOT,
AS_AND,AS_OR,AS_XOR);
type
tx86intreader = class(tasmreader)
actasmtoken : tasmtoken;
prevasmtoken : tasmtoken;
ActOpsize : topsize;
constructor create;override;
function is_asmopcode(const s: string):boolean;
function is_asmoperator(const s: string):boolean;
function is_asmdirective(const s: string):boolean;
function is_register(const s:string):boolean;
function is_locallabel(const s:string):boolean;
function Assemble: tlinkedlist;override;
procedure GetToken;
function consume(t : tasmtoken):boolean;
procedure RecoverConsume(allowcomma:boolean);
procedure BuildRecordOffsetSize(const expr: string;var offset:aint;var size:aint; var mangledname: string; needvmtofs: boolean);
procedure BuildConstSymbolExpression(needofs,isref:boolean;var value:aint;var asmsym:string;var asmsymtyp:TAsmsymtype);
function BuildConstExpression:aint;
function BuildRefConstExpression:aint;
procedure BuildReference(oper : tx86operand);
procedure BuildOperand(oper: tx86operand;istypecast:boolean);
procedure BuildConstantOperand(oper: tx86operand);
procedure BuildOpCode(instr : tx86instruction);
procedure BuildConstant(constsize: byte);
end;
implementation
uses
{ common }
cutils,
{ global }
globals,verbose,
systems,
{ aasm }
aasmtai,aasmdata,aasmcpu,
{ symtable }
symconst,symbase,symtype,symsym,symdef,symtable,
{ parser }
scanner,
{ register allocator }
rabase,rautils,itx86int,
{ codegen }
cgbase,cgobj,procinfo
;
type
tasmkeyword = string[9];
const
{ These tokens should be modified accordingly to the modifications }
{ in the different enumerations. }
firstdirective = AS_ALIGN;
lastdirective = AS_END;
firstoperator = AS_BYTE;
lastoperator = AS_XOR;
_count_asmdirectives = longint(lastdirective)-longint(firstdirective);
_count_asmoperators = longint(lastoperator)-longint(firstoperator);
_asmdirectives : array[0.._count_asmdirectives] of tasmkeyword =
('ALIGN','DB','DW','DD','END');
{ problems with shl,shr,not,and,or and xor, they are }
{ context sensitive. }
_asmoperators : array[0.._count_asmoperators] of tasmkeyword = (
'BYTE','WORD','DWORD','QWORD','TBYTE','DQWORD','NEAR','FAR','HIGH',
'LOW','OFFSET','SIZEOF','VMTOFFSET','SEG','TYPE','PTR','MOD','SHL','SHR','NOT','AND',
'OR','XOR');
token2str : array[tasmtoken] of string[10] = (
'','Label','LLabel','String','Integer',
',','[',']','(',
')',':','.','+','-','*',
';','identifier','register','opcode','/',
'','','','','END',
'','','','','','','','','',
'','','sizeof','vmtoffset','','type','ptr','mod','shl','shr','not',
'and','or','xor'
);
var
inexpression : boolean;
constructor tx86intreader.create;
var
i : tasmop;
Begin
inherited create;
iasmops:=TFPHashList.create;
for i:=firstop to lastop do
iasmops.Add(upper(std_op2str[i]),Pointer(PtrInt(i)));
end;
{---------------------------------------------------------------------}
{ Routines for the tokenizing }
{---------------------------------------------------------------------}
function tx86intreader.is_asmopcode(const s: string):boolean;
var
cond : string[4];
cnd : tasmcond;
j: longint;
Begin
is_asmopcode:=FALSE;
actopcode:=A_None;
actcondition:=C_None;
actopsize:=S_NO;
{ Search opcodes }
actopcode:=tasmop(PtrInt(iasmops.Find(s)));
if actopcode<>A_NONE then
begin
actasmtoken:=AS_OPCODE;
result:=TRUE;
exit;
end;
{ not found yet, check condition opcodes }
j:=0;
while (j<CondAsmOps) do
begin
if Copy(s,1,Length(CondAsmOpStr[j]))=CondAsmOpStr[j] then
begin
cond:=Copy(s,Length(CondAsmOpStr[j])+1,255);
if cond<>'' then
begin
for cnd:=low(TasmCond) to high(TasmCond) do
if Cond=Upper(cond2str[cnd]) then
begin
actopcode:=CondASmOp[j];
actcondition:=cnd;
is_asmopcode:=TRUE;
actasmtoken:=AS_OPCODE;
exit
end;
end;
end;
inc(j);
end;
end;
function tx86intreader.is_asmoperator(const s: string):boolean;
var
i : longint;
Begin
for i:=0 to _count_asmoperators do
if s=_asmoperators[i] then
begin
actasmtoken:=tasmtoken(longint(firstoperator)+i);
is_asmoperator:=true;
exit;
end;
is_asmoperator:=false;
end;
Function tx86intreader.is_asmdirective(const s: string):boolean;
var
i : longint;
Begin
for i:=0 to _count_asmdirectives do
if s=_asmdirectives[i] then
begin
actasmtoken:=tasmtoken(longint(firstdirective)+i);
is_asmdirective:=true;
exit;
end;
is_asmdirective:=false;
end;
function tx86intreader.is_register(const s:string):boolean;
begin
is_register:=false;
actasmregister:=masm_regnum_search(lower(s));
if actasmregister<>NR_NO then
begin
is_register:=true;
actasmtoken:=AS_REGISTER;
end;
end;
function tx86intreader.is_locallabel(const s:string):boolean;
begin
is_locallabel:=(length(s)>1) and (s[1]='@');
end;
Procedure tx86intreader.GetToken;
var
len : longint;
forcelabel : boolean;
srsym : tsym;
srsymtable : TSymtable;
begin
{ save old token and reset new token }
prevasmtoken:=actasmtoken;
actasmtoken:=AS_NONE;
{ reset }
forcelabel:=FALSE;
actasmpattern:='';
{ while space and tab , continue scan... }
while (c in [' ',#9]) do
c:=current_scanner.asmgetchar;
{ get token pos }
if not (c in [#10,#13,'{',';']) then
current_scanner.gettokenpos;
{ Local Label, Label, Directive, Prefix or Opcode }
if firsttoken and not (c in [#10,#13,'{',';']) then
begin
firsttoken:=FALSE;
len:=0;
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;
inc(len);
actasmpattern[len]:=c;
c:=current_scanner.asmgetchar;
end;
actasmpattern[0]:=chr(len);
uppervar(actasmpattern);
{ allow spaces }
while (c in [' ',#9]) do
c:=current_scanner.asmgetchar;
{ label ? }
if c = ':' then
begin
if actasmpattern[1]='@' then
actasmtoken:=AS_LLABEL
else
actasmtoken:=AS_LABEL;
{ let us point to the next character }
c:=current_scanner.asmgetchar;
firsttoken:=true;
exit;
end;
{ Are we trying to create an identifier with }
{ an at-sign...? }
if forcelabel then
Message(asmr_e_none_label_contain_at);
{ opcode ? }
If is_asmopcode(actasmpattern) then
Begin
{ check if we are in an expression }
{ then continue with asm directives }
if not inexpression then
exit;
end;
if is_asmdirective(actasmpattern) then
exit;
message1(asmr_e_unknown_opcode,actasmpattern);
actasmtoken:=AS_NONE;
exit;
end
else { else firsttoken }
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;
'A'..'Z','a'..'z','_': { identifier, register, opcode, prefix or directive }
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);
{ after prefix we allow also a new opcode }
If is_prefix(actopcode) and is_asmopcode(actasmpattern) then
Begin
{ if we are not in a constant }
{ expression than this is an }
{ opcode. }
if not inexpression then
exit;
end;
{ support st(X) for fpu registers }
if (actasmpattern = 'ST') and (c='(') then
Begin
actasmpattern:=actasmpattern+c;
c:=current_scanner.asmgetchar;
{ allow spaces }
while (c in [' ',#9]) do
c:=current_scanner.asmgetchar;
if c in ['0'..'7'] then
actasmpattern:=actasmpattern + c
else
Message(asmr_e_invalid_fpu_register);
c:=current_scanner.asmgetchar;
{ allow spaces }
while (c in [' ',#9]) do
c:=current_scanner.asmgetchar;
if c <> ')' then
Message(asmr_e_invalid_fpu_register)
else
Begin
actasmpattern:=actasmpattern + c;
c:=current_scanner.asmgetchar;
end;
end;
if is_register(actasmpattern) then
exit;
if is_asmdirective(actasmpattern) then
exit;
if is_asmoperator(actasmpattern) then
exit;
{ allow spaces }
while (c in [' ',#9]) do
c:=current_scanner.asmgetchar;
{ if next is a '.' and this is a unitsym then we also need to
parse the identifier }
if (c='.') then
begin
searchsym(actasmpattern,srsym,srsymtable);
if assigned(srsym) and
(srsym.typ=unitsym) and
(srsym.owner.symtabletype in [staticsymtable,globalsymtable]) and
srsym.owner.iscurrentunit then
begin
{ Add . to create System.Identifier }
actasmpattern:=actasmpattern+c;
c:=current_scanner.asmgetchar;
{ Delphi allows System.@Halt, just ignore the @ }
if c='@' then
c:=current_scanner.asmgetchar;
while c in ['A'..'Z','a'..'z','0'..'9','_','$'] do
begin
actasmpattern:=actasmpattern + upcase(c);
c:=current_scanner.asmgetchar;
end;
end;
end;
actasmtoken:=AS_ID;
exit;
end;
'''' : { string or character }
begin
actasmpattern:='';
current_scanner.in_asm_string:=true;
repeat
if c = '''' then
begin
c:=current_scanner.asmgetchar;
if c in [#10,#13] 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 in [#10,#13] 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 in [#10,#13] then
begin
Message(scan_f_string_exceeds_line);
break
end;
end;
until false; { end repeat }
end
else
break; { end if }
until false;
current_scanner.in_asm_string:=false;
actasmtoken:=AS_STRING;
exit;
end;
'"' : { string or character }
begin
current_scanner.in_asm_string:=true;
actasmpattern:='';
repeat
if c = '"' then
begin
c:=current_scanner.asmgetchar;
if c in [#10,#13] 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 in [#10,#13] 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 in [#10,#13] then
begin
Message(scan_f_string_exceeds_line);
break
end;
end;
until false; { end repeat }
end
else
break; { end if }
until false;
current_scanner.in_asm_string:=false;
actasmtoken:=AS_STRING;
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;
actasmpattern:=tostr(ParseVal(actasmpattern,16));
actasmtoken:=AS_INTNUM;
exit;
end;
'&' : { identifier }
begin
actasmpattern:='';
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;
',' :
begin
actasmtoken:=AS_COMMA;
c:=current_scanner.asmgetchar;
exit;
end;
'[' :
begin
actasmtoken:=AS_LBRACKET;
c:=current_scanner.asmgetchar;
exit;
end;
']' :
begin
actasmtoken:=AS_RBRACKET;
c:=current_scanner.asmgetchar;
exit;
end;
'(' :
begin
actasmtoken:=AS_LPAREN;
c:=current_scanner.asmgetchar;
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
actasmtoken:=AS_SLASH;
c:=current_scanner.asmgetchar;
exit;
end;
'0'..'9':
begin
actasmpattern:=c;
c:=current_scanner.asmgetchar;
{ Get the possible characters }
while c in ['0'..'9','A'..'F','a'..'f'] do
begin
actasmpattern:=actasmpattern + c;
c:=current_scanner.asmgetchar;
end;
{ Get ending character }
uppervar(actasmpattern);
c:=upcase(c);
{ possibly a binary number. }
if (actasmpattern[length(actasmpattern)] = 'B') and (c <> 'H') then
Begin
{ Delete the last binary specifier }
delete(actasmpattern,length(actasmpattern),1);
actasmpattern:=tostr(ParseVal(actasmpattern,2));
actasmtoken:=AS_INTNUM;
exit;
end
else
Begin
case c of
'O' :
Begin
actasmpattern:=tostr(ParseVal(actasmpattern,8));
actasmtoken:=AS_INTNUM;
c:=current_scanner.asmgetchar;
exit;
end;
'H' :
Begin
actasmpattern:=tostr(ParseVal(actasmpattern,16));
actasmtoken:=AS_INTNUM;
c:=current_scanner.asmgetchar;
exit;
end;
else { must be an integer number }
begin
actasmpattern:=tostr(ParseVal(actasmpattern,10));
actasmtoken:=AS_INTNUM;
exit;
end;
end;
end;
end;
';','{',#13,#10 :
begin
c:=current_scanner.asmgetchar;
firsttoken:=TRUE;
actasmtoken:=AS_SEPARATOR;
exit;
end;
else
current_scanner.illegal_char(c);
end;
end;
end;
function tx86intreader.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;
procedure tx86intreader.RecoverConsume(allowcomma:boolean);
begin
While not (actasmtoken in [AS_SEPARATOR,AS_END]) do
begin
if allowcomma and (actasmtoken=AS_COMMA) then
break;
Consume(actasmtoken);
end;
end;
{*****************************************************************************
Parsing Helpers
*****************************************************************************}
{ This routine builds up a record offset after a AS_DOT
token is encountered.
On entry actasmtoken should be equal to AS_DOT }
Procedure tx86intreader.BuildRecordOffsetSize(const expr: string;var offset:aint;var size:aint; var mangledname: string; needvmtofs: boolean);
var
s: string;
Begin
offset:=0;
size:=0;
s:=expr;
while (actasmtoken=AS_DOT) do
begin
Consume(AS_DOT);
if actasmtoken in [AS_BYTE,AS_ID,AS_WORD,AS_DWORD,AS_QWORD] then
begin
s:=s+'.'+actasmpattern;
consume(actasmtoken);
end
else
begin
Consume(AS_ID);
RecoverConsume(true);
break;
end;
end;
if not GetRecordOffsetSize(s,offset,size,mangledname,needvmtofs) then
Message(asmr_e_building_record_offset);
end;
Procedure tx86intreader.BuildConstSymbolExpression(needofs,isref:boolean;var value:aint;var asmsym:string;var asmsymtyp:TAsmsymtype);
var
tempstr,expr,hs,mangledname : string;
parenlevel : longint;
l,k : aint;
hasparen,
errorflag,
needvmtofs : boolean;
prevtok : tasmtoken;
hl : tasmlabel;
hssymtyp : Tasmsymtype;
def : tdef;
sym : tsym;
srsymtable : TSymtable;
Begin
{ reset }
value:=0;
asmsym:='';
asmsymtyp:=AT_DATA;
errorflag:=FALSE;
tempstr:='';
expr:='';
inexpression:=TRUE;
parenlevel:=0;
sym:=nil;
needvmtofs:=FALSE;
Repeat
{ Support ugly delphi constructs like: [ECX].1+2[EDX] }
if isref and (actasmtoken=AS_LBRACKET) then
break;
Case actasmtoken of
AS_LPAREN:
Begin
Consume(AS_LPAREN);
expr:=expr + '(';
inc(parenlevel);
end;
AS_RPAREN:
Begin
{ Keep the AS_PAREN in actasmtoken, it is maybe a typecast }
if parenlevel=0 then
break;
Consume(AS_RPAREN);
expr:=expr + ')';
dec(parenlevel);
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);
if isref and (actasmtoken=AS_REGISTER) then
break;
expr:=expr + '*';
end;
AS_PLUS:
Begin
Consume(AS_PLUS);
if isref and (actasmtoken=AS_REGISTER) then
break;
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_INTNUM:
Begin
expr:=expr + actasmpattern;
Consume(AS_INTNUM);
end;
AS_VMTOFFSET,
AS_OFFSET:
begin
if (actasmtoken = AS_OFFSET) then
needofs:=true
else
needvmtofs:=true;
Consume(actasmtoken);
if actasmtoken<>AS_ID then
Message(asmr_e_offset_without_identifier);
end;
AS_SIZEOF,
AS_TYPE:
begin
l:=0;
hasparen:=false;
Consume(actasmtoken);
if actasmtoken=AS_LPAREN then
begin
hasparen:=true;
Consume(AS_LPAREN);
end;
if actasmtoken<>AS_ID then
Message(asmr_e_type_without_identifier)
else
begin
tempstr:=actasmpattern;
Consume(AS_ID);
if actasmtoken=AS_DOT then
begin
BuildRecordOffsetSize(tempstr,k,l,mangledname,false);
if mangledname<>'' then
{ procsym }
Message(asmr_e_wrong_sym_type);
end
else
begin
searchsym(tempstr,sym,srsymtable);
if assigned(sym) then
begin
case sym.typ of
staticvarsym,
localvarsym,
paravarsym :
l:=tabstractvarsym(sym).getsize;
typesym :
l:=ttypesym(sym).typedef.size;
else
Message(asmr_e_wrong_sym_type);
end;
end
else
Message1(sym_e_unknown_id,tempstr);
end;
end;
str(l, tempstr);
expr:=expr + tempstr;
if hasparen then
Consume(AS_RPAREN);
end;
AS_PTR :
begin
{ Support ugly delphi constructs like <constant> PTR [ref] }
break;
end;
AS_STRING:
begin
l:=0;
case Length(actasmpattern) of
1 :
l:=ord(actasmpattern[1]);
2 :
l:=ord(actasmpattern[2]) + ord(actasmpattern[1]) shl 8;
3 :
l:=ord(actasmpattern[3]) +
Ord(actasmpattern[2]) shl 8 + ord(actasmpattern[1]) shl 16;
4 :
l:=ord(actasmpattern[4]) + ord(actasmpattern[3]) shl 8 +
Ord(actasmpattern[2]) shl 16 + ord(actasmpattern[1]) shl 24;
else
Message1(asmr_e_invalid_string_as_opcode_operand,actasmpattern);
end;
str(l, tempstr);
expr:=expr + tempstr;
Consume(AS_STRING);
end;
AS_ID:
begin
hs:='';
hssymtyp:=AT_DATA;
def:=nil;
tempstr:=actasmpattern;
prevtok:=prevasmtoken;
{ stop parsing a constant expression if we find an opcode after a
non-operator like "db $66 mov eax,ebx" }
if (prevtok in [AS_ID,AS_INTNUM,AS_RPAREN]) and
is_asmopcode(actasmpattern) then
break;
consume(AS_ID);
if SearchIConstant(tempstr,l) then
begin
str(l, tempstr);
expr:=expr + tempstr;
end
else
begin
if is_locallabel(tempstr) then
begin
CreateLocalLabel(tempstr,hl,false);
hs:=hl.name;
hssymtyp:=AT_FUNCTION;
end
else
if SearchLabel(tempstr,hl,false) then
begin
hs:=hl.name;
hssymtyp:=AT_FUNCTION;
end
else
begin
searchsym(tempstr,sym,srsymtable);
if assigned(sym) then
begin
case sym.typ of
staticvarsym :
begin
hs:=tstaticvarsym(sym).mangledname;
def:=tstaticvarsym(sym).vardef;
end;
localvarsym,
paravarsym :
begin
Message(asmr_e_no_local_or_para_allowed);
end;
procsym :
begin
if Tprocsym(sym).ProcdefList.Count>1 then
Message(asmr_w_calling_overload_func);
hs:=tprocdef(tprocsym(sym).ProcdefList[0]).mangledname;
hssymtyp:=AT_FUNCTION;
end;
typesym :
begin
if not(ttypesym(sym).typedef.typ in [recorddef,objectdef]) then
Message(asmr_e_wrong_sym_type);
end;
fieldvarsym :
begin
tempstr:=upper(tdef(sym.owner.defowner).GetTypeName)+'.'+tempstr;
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
begin
asmsym:=hs;
asmsymtyp:=hssymtyp;
end
else
Message(asmr_e_cant_have_multiple_relocatable_symbols);
if (expr='') or (expr[length(expr)]='+') then
begin
{ don't remove the + if there could be a record field }
if actasmtoken<>AS_DOT then
delete(expr,length(expr),1);
end
else
if needofs then
begin
if (prevtok<>AS_OFFSET) then
Message(asmr_e_need_offset);
end
else
Message(asmr_e_only_add_relocatable_symbol);
end;
if (actasmtoken=AS_DOT) or
(assigned(sym) and
(sym.typ = fieldvarsym)) then
begin
BuildRecordOffsetSize(tempstr,l,k,hs,needvmtofs);
if hs <> '' then
hssymtyp:=AT_FUNCTION
else
begin
str(l, tempstr);
expr:=expr + tempstr;
end
end
else
begin
if (expr='') or (expr[length(expr)] in ['+','-','/','*']) then
delete(expr,length(expr),1);
end;
if (actasmtoken=AS_LBRACKET) and
assigned(def) and
(def.typ=arraydef) then
begin
consume(AS_LBRACKET);
l:=BuildConstExpression;
if l<tarraydef(def).lowrange then
begin
Message(asmr_e_constant_out_of_bounds);
l:=0;
end
else
l:=(l-tarraydef(def).lowrange)*tarraydef(def).elesize;
str(l, tempstr);
expr:=expr + '+' + tempstr;
consume(AS_RBRACKET);
end;
end;
{ check if there are wrong operator used like / or mod etc. }
if (hs<>'') and not(actasmtoken in [AS_MINUS,AS_PLUS,AS_COMMA,AS_SEPARATOR,AS_END,AS_RBRACKET]) then
Message(asmr_e_only_add_relocatable_symbol);
end;
AS_ALIGN,
AS_DB,
AS_DW,
AS_DD,
AS_END,
AS_RBRACKET,
AS_SEPARATOR,
AS_COMMA,
AS_COLON:
break;
else
begin
{ write error only 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;
{ calculate expression }
if not ErrorFlag then
value:=CalculateExpression(expr)
else
value:=0;
{ no longer in an expression }
inexpression:=FALSE;
end;
Function tx86intreader.BuildConstExpression:aint;
var
l : aint;
hs : string;
hssymtyp : TAsmsymtype;
begin
BuildConstSymbolExpression(false,false,l,hs,hssymtyp);
if hs<>'' then
Message(asmr_e_relocatable_symbol_not_allowed);
BuildConstExpression:=l;
end;
Function tx86intreader.BuildRefConstExpression:aint;
var
l : aint;
hs : string;
hssymtyp : TAsmsymtype;
begin
BuildConstSymbolExpression(false,true,l,hs,hssymtyp);
if hs<>'' then
Message(asmr_e_relocatable_symbol_not_allowed);
BuildRefConstExpression:=l;
end;
procedure tx86intreader.BuildReference(oper : tx86operand);
var
scale : byte;
k,l : aint;
tempstr,hs : string;
tempsymtyp : tasmsymtype;
code : integer;
hreg : tregister;
GotStar,GotOffset,HadVar,
GotPlus,Negative : boolean;
hl : tasmlabel;
Begin
Consume(AS_LBRACKET);
if not(oper.opr.typ in [OPR_LOCAL,OPR_REFERENCE]) then
oper.InitRef;
GotStar:=false;
GotPlus:=true;
GotOffset:=false;
Negative:=false;
Scale:=0;
repeat
if GotOffset and (actasmtoken<>AS_ID) then
Message(asmr_e_invalid_reference_syntax);
Case actasmtoken of
AS_ID, { Constant reference expression OR variable reference expression }
AS_VMTOFFSET:
Begin
if not GotPlus then
Message(asmr_e_invalid_reference_syntax);
GotStar:=false;
GotPlus:=false;
if (actasmtoken = AS_VMTOFFSET) or
(SearchIConstant(actasmpattern,l) or
SearchRecordType(actasmpattern)) then
begin
l:=BuildRefConstExpression;
GotPlus:=(prevasmtoken=AS_PLUS);
GotStar:=(prevasmtoken=AS_STAR);
case oper.opr.typ of
OPR_LOCAL :
begin
if GotStar then
Message(asmr_e_invalid_reference_syntax);
if negative then
Dec(oper.opr.localsymofs,l)
else
Inc(oper.opr.localsymofs,l);
end;
OPR_REFERENCE :
begin
if GotStar then
oper.opr.ref.scalefactor:=l
else
begin
if negative then
Dec(oper.opr.ref.offset,l)
else
Inc(oper.opr.ref.offset,l);
end;
end;
end;
end
else
Begin
if oper.hasvar and not GotOffset then
Message(asmr_e_cant_have_multiple_relocatable_symbols);
HadVar:=oper.hasvar and GotOffset;
if negative then
Message(asmr_e_only_add_relocatable_symbol);
tempstr:=actasmpattern;
Consume(AS_ID);
{ typecasting? }
if (actasmtoken=AS_LPAREN) and
SearchType(tempstr,l) then
begin
oper.hastype:=true;
oper.typesize:=l;
Consume(AS_LPAREN);
BuildOperand(oper,true);
Consume(AS_RPAREN);
end
else
if is_locallabel(tempstr) then
begin
CreateLocalLabel(tempstr,hl,false);
oper.InitRef;
oper.opr.ref.symbol:=hl;
oper.hasvar:=true;
end
else
if oper.SetupVar(tempstr,GotOffset) then
begin
{ force OPR_LOCAL to be a reference }
if oper.opr.typ=OPR_LOCAL then
oper.opr.localforceref:=true;
end
else
Message1(sym_e_unknown_id,tempstr);
{ record.field ? }
if actasmtoken=AS_DOT then
begin
BuildRecordOffsetSize(tempstr,l,k,hs,false);
if (hs<>'') then
Message(asmr_e_invalid_symbol_ref);
case oper.opr.typ of
OPR_LOCAL :
inc(oper.opr.localsymofs,l);
OPR_REFERENCE :
inc(oper.opr.ref.offset,l);
end;
end;
if GotOffset then
begin
if oper.hasvar and (oper.opr.ref.base=current_procinfo.framepointer) then
begin
if (oper.opr.typ=OPR_REFERENCE) then
oper.opr.ref.base:=NR_NO;
oper.hasvar:=hadvar;
end
else
begin
if oper.hasvar and hadvar then
Message(asmr_e_cant_have_multiple_relocatable_symbols);
{ should we allow ?? }
end;
end;
end;
GotOffset:=false;
end;
AS_PLUS :
Begin
Consume(AS_PLUS);
Negative:=false;
GotPlus:=true;
GotStar:=false;
Scale:=0;
end;
AS_DOT :
Begin
{ Handle like a + }
Consume(AS_DOT);
Negative:=false;
GotPlus:=true;
GotStar:=false;
Scale:=0;
end;
AS_MINUS :
begin
Consume(AS_MINUS);
Negative:=true;
GotPlus:=true;
GotStar:=false;
Scale:=0;
end;
AS_STAR : { Scaling, with eax*4 order }
begin
Consume(AS_STAR);
hs:='';
l:=0;
case actasmtoken of
AS_LPAREN :
l:=BuildConstExpression;
AS_INTNUM:
Begin
hs:=actasmpattern;
Consume(AS_INTNUM);
end;
AS_REGISTER :
begin
case oper.opr.typ of
OPR_REFERENCE :
begin
if oper.opr.ref.scalefactor=0 then
begin
if scale<>0 then
begin
oper.opr.ref.scalefactor:=scale;
scale:=0;
end
else
Message(asmr_e_wrong_scale_factor);
end
else
Message(asmr_e_invalid_reference_syntax);
end;
OPR_LOCAL :
begin
if oper.opr.localscale=0 then
begin
if scale<>0 then
begin
oper.opr.localscale:=scale;
scale:=0;
end
else
Message(asmr_e_wrong_scale_factor);
end
else
Message(asmr_e_invalid_reference_syntax);
end;
end;
end;
else
Message(asmr_e_invalid_reference_syntax);
end;
if actasmtoken<>AS_REGISTER then
begin
if hs<>'' then
val(hs,l,code);
case oper.opr.typ of
OPR_REFERENCE :
oper.opr.ref.scalefactor:=l;
OPR_LOCAL :
oper.opr.localscale:=l;
end;
if l>9 then
Message(asmr_e_wrong_scale_factor);
end;
GotPlus:=false;
GotStar:=false;
end;
AS_REGISTER :
begin
if not((GotPlus and (not Negative)) or
GotStar) then
Message(asmr_e_invalid_reference_syntax);
hreg:=actasmregister;
Consume(AS_REGISTER);
{ this register will be the index:
1. just read a *
2. next token is a *
3. base register is already used }
case oper.opr.typ of
OPR_LOCAL :
begin
if (oper.opr.localindexreg<>NR_NO) then
Message(asmr_e_multiple_index);
oper.opr.localindexreg:=hreg;
if scale<>0 then
begin
oper.opr.localscale:=scale;
scale:=0;
end;
end;
OPR_REFERENCE :
begin
if (GotStar) or
(actasmtoken=AS_STAR) or
(oper.opr.ref.base<>NR_NO) then
begin
if (oper.opr.ref.index<>NR_NO) then
Message(asmr_e_multiple_index);
oper.opr.ref.index:=hreg;
if scale<>0 then
begin
oper.opr.ref.scalefactor:=scale;
scale:=0;
end;
end
else
oper.opr.ref.base:=hreg;
end;
end;
GotPlus:=false;
GotStar:=false;
end;
AS_OFFSET :
begin
Consume(AS_OFFSET);
GotOffset:=true;
end;
AS_TYPE,
AS_NOT,
AS_STRING,
AS_INTNUM,
AS_LPAREN : { Constant reference expression }
begin
if not GotPlus and not GotStar then
Message(asmr_e_invalid_reference_syntax);
BuildConstSymbolExpression(true,true,l,tempstr,tempsymtyp);
if tempstr<>'' then
begin
if GotStar then
Message(asmr_e_only_add_relocatable_symbol);
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);
end;
case oper.opr.typ of
OPR_REFERENCE :
begin
if GotStar then
oper.opr.ref.scalefactor:=l
else if (prevasmtoken = AS_STAR) then
begin
if scale<>0 then
scale:=l*scale
else
scale:=l;
end
else
begin
if negative then
Dec(oper.opr.ref.offset,l)
else
Inc(oper.opr.ref.offset,l);
end;
end;
OPR_LOCAL :
begin
if GotStar then
oper.opr.localscale:=l
else if (prevasmtoken = AS_STAR) then
begin
if scale<>0 then
scale:=l*scale
else
scale:=l;
end
else
begin
if negative then
Dec(oper.opr.localsymofs,l)
else
Inc(oper.opr.localsymofs,l);
end;
end;
end;
GotPlus:=(prevasmtoken=AS_PLUS) or
(prevasmtoken=AS_MINUS);
if GotPlus then
negative := prevasmtoken = AS_MINUS;
GotStar:=(prevasmtoken=AS_STAR);
end;
AS_RBRACKET :
begin
if GotPlus or GotStar then
Message(asmr_e_invalid_reference_syntax);
Consume(AS_RBRACKET);
break;
end;
else
Begin
Message(asmr_e_invalid_reference_syntax);
RecoverConsume(true);
break;
end;
end;
until false;
end;
Procedure tx86intreader.BuildConstantOperand(oper: tx86operand);
var
l : aint;
tempstr : string;
tempsymtyp : tasmsymtype;
begin
if not (oper.opr.typ in [OPR_NONE,OPR_CONSTANT]) then
Message(asmr_e_invalid_operand_type);
BuildConstSymbolExpression(true,false,l,tempstr,tempsymtyp);
if tempstr<>'' then
begin
oper.opr.typ:=OPR_SYMBOL;
oper.opr.symofs:=l;
oper.opr.symbol:=current_asmdata.RefAsmSymbol(tempstr);
end
else
if oper.opr.typ=OPR_NONE then
begin
oper.opr.typ:=OPR_CONSTANT;
oper.opr.val:=l;
end
else
inc(oper.opr.val,l);
end;
Procedure tx86intreader.BuildOperand(oper: tx86operand;istypecast:boolean);
procedure AddLabelOperand(hl:tasmlabel);
begin
if (oper.opr.typ=OPR_NONE) 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;
var
expr,
hs : string;
tempreg : tregister;
l : aint;
hl : tasmlabel;
toffset,
tsize : aint;
begin
expr:='';
repeat
if actasmtoken=AS_DOT then
begin
if expr<>'' then
begin
BuildRecordOffsetSize(expr,toffset,tsize,hs,false);
if (oper.opr.typ<>OPR_NONE) and
(hs<>'') then
Message(asmr_e_wrong_sym_type);
oper.SetSize(tsize,true);
{ we have used the size of a field. Reset the typesize of the record }
oper.typesize:=0;
case oper.opr.typ of
OPR_LOCAL :
begin
{ don't allow direct access to fields of parameters, becuase that
will generate buggy code. Allow it only for explicit typecasting
and when the parameter is in a register (delphi compatible) }
if (not oper.hastype) and
(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,toffset)
end;
OPR_CONSTANT :
inc(oper.opr.val,toffset);
OPR_REFERENCE :
inc(oper.opr.ref.offset,toffset);
OPR_NONE :
begin
if (hs <> '') then
begin
oper.opr.typ:=OPR_SYMBOL;
oper.opr.symbol:=current_asmdata.RefAsmSymbol(hs);
end
else
begin
oper.opr.typ:=OPR_CONSTANT;
oper.opr.val:=toffset;
end;
end;
OPR_SYMBOL:
Message(asmr_e_invalid_symbol_ref);
else
internalerror(200309222);
end;
expr:='';
end
else
begin
{ See it as a separator }
Consume(AS_DOT);
end;
end;
case actasmtoken of
AS_OFFSET,
AS_SIZEOF,
AS_VMTOFFSET,
AS_TYPE,
AS_NOT,
AS_STRING,
AS_PLUS,
AS_MINUS,
AS_LPAREN,
AS_INTNUM :
begin
case oper.opr.typ of
OPR_REFERENCE :
inc(oper.opr.ref.offset,BuildRefConstExpression);
OPR_LOCAL :
inc(oper.opr.localsymofs,BuildConstExpression);
OPR_NONE,
OPR_CONSTANT :
BuildConstantOperand(oper);
else
Message(asmr_e_invalid_operand_type);
end;
end;
AS_PTR :
begin
if not oper.hastype then
begin
if (oper.opr.typ=OPR_CONSTANT) then
begin
oper.typesize:=oper.opr.val;
{ reset constant value of operand }
oper.opr.typ:=OPR_NONE;
oper.opr.val:=0;
end
else
Message(asmr_e_syn_operand);
end;
Consume(AS_PTR);
oper.InitRef;
BuildOperand(oper,false);
end;
AS_ID : { A constant expression, or a Variable ref. }
Begin
{ Label or Special symbol reference? }
if actasmpattern[1] = '@' then
Begin
if actasmpattern = '@RESULT' then
Begin
oper.SetupResult;
Consume(AS_ID);
end
else
if (actasmpattern = '@CODE') or (actasmpattern = '@DATA') then
begin
Message(asmr_w_CODE_and_DATA_not_supported);
Consume(AS_ID);
end
else
{ Local Label }
begin
CreateLocalLabel(actasmpattern,hl,false);
Consume(AS_ID);
AddLabelOperand(hl);
end;
end
else
{ support result for delphi modes }
if (m_objpas in current_settings.modeswitches) and (actasmpattern='RESULT') then
begin
oper.SetUpResult;
Consume(AS_ID);
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
case oper.opr.typ of
OPR_REFERENCE :
inc(oper.opr.ref.offset,BuildRefConstExpression);
OPR_LOCAL :
inc(oper.opr.localsymofs,BuildRefConstExpression);
OPR_NONE,
OPR_CONSTANT :
BuildConstantOperand(oper);
else
Message(asmr_e_invalid_operand_type);
end;
end
else
{ Check for pascal label }
if SearchLabel(actasmpattern,hl,false) then
begin
Consume(AS_ID);
AddLabelOperand(hl);
end
else
{ is it a normal variable ? }
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
Message1(sym_e_unknown_id,expr);
expr:='';
end;
end;
end;
end;
end;
AS_REGISTER : { Register, a variable reference or a constant reference }
begin
{ save the type of register used. }
tempreg:=actasmregister;
Consume(AS_REGISTER);
if actasmtoken = AS_COLON then
Begin
Consume(AS_COLON);
oper.InitRef;
oper.opr.ref.segment:=tempreg;
BuildReference(oper);
end
else
{ Simple register }
begin
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:=tempreg;
oper.SetSize(tcgsize2size[reg_cgsize(oper.opr.reg)],true);
end;
end;
AS_LBRACKET: { a variable reference, register ref. or a constant reference }
Begin
BuildReference(oper);
end;
AS_SEG :
Begin
Message(asmr_e_seg_not_supported);
Consume(actasmtoken);
end;
AS_DWORD,
AS_BYTE,
AS_WORD,
AS_TBYTE,
AS_DQWORD,
AS_QWORD :
begin
{ Type specifier }
oper.hastype:=true;
oper.typesize:=0;
case actasmtoken of
AS_DWORD : oper.typesize:=4;
AS_WORD : oper.typesize:=2;
AS_BYTE : oper.typesize:=1;
AS_QWORD : oper.typesize:=8;
AS_DQWORD : oper.typesize:=16;
AS_TBYTE : oper.typesize:=10;
end;
Consume(actasmtoken);
if (actasmtoken=AS_LPAREN) then
begin
{ Support Type([Reference]) }
Consume(AS_LPAREN);
BuildOperand(oper,true);
Consume(AS_RPAREN);
end;
end;
AS_SEPARATOR,
AS_END,
AS_COMMA,
AS_COLON:
begin
break;
end;
AS_RPAREN:
begin
if not istypecast then
begin
Message(asmr_e_syn_operand);
Consume(AS_RPAREN);
end
else
break;
end;
else
begin
Message(asmr_e_syn_operand);
RecoverConsume(true);
break;
end;
end;
until false;
{ End of operand, update size if a typecast is forced }
if (oper.typesize<>0) and
(oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL]) then
oper.SetSize(oper.typesize,true);
end;
Procedure tx86intreader.BuildOpCode(instr : tx86instruction);
var
PrefixOp,OverrideOp: tasmop;
operandnum : longint;
is_far_const:boolean;
i:byte;
begin
PrefixOp:=A_None;
OverrideOp:=A_None;
is_far_const:=false;
{ prefix seg opcode / prefix opcode }
repeat
if is_prefix(actopcode) then
with instr do
begin
OpOrder:=op_intel;
PrefixOp:=ActOpcode;
opcode:=ActOpcode;
condition:=ActCondition;
opsize:=ActOpsize;
ConcatInstruction(curlist);
consume(AS_OPCODE);
end
else
if is_override(actopcode) then
with instr do
begin
OpOrder:=op_intel;
OverrideOp:=ActOpcode;
opcode:=ActOpcode;
condition:=ActCondition;
opsize:=ActOpsize;
ConcatInstruction(curlist);
consume(AS_OPCODE);
end
else
break;
{ allow for newline after prefix or override }
while actasmtoken=AS_SEPARATOR do
consume(AS_SEPARATOR);
until (actasmtoken<>AS_OPCODE);
{ opcode }
if (actasmtoken <> AS_OPCODE) then
begin
Message(asmr_e_invalid_or_missing_opcode);
RecoverConsume(false);
exit;
end;
{ Fill the instr object with the current state }
with instr do
begin
OpOrder:=op_intel;
Opcode:=ActOpcode;
condition:=ActCondition;
opsize:=ActOpsize;
{ Valid combination of prefix/override and instruction ? }
if (prefixop<>A_NONE) and (NOT CheckPrefix(PrefixOp,actopcode)) then
Message1(asmr_e_invalid_prefix_and_opcode,actasmpattern);
if (overrideop<>A_NONE) and (NOT CheckOverride(OverrideOp,ActOpcode)) then
Message1(asmr_e_invalid_override_and_opcode,actasmpattern);
end;
{ We are reading operands, so opcode will be an AS_ID }
operandnum:=1;
is_far_const:=false;
Consume(AS_OPCODE);
{ Zero operand opcode ? }
if actasmtoken in [AS_SEPARATOR,AS_END] then
begin
operandnum:=0;
exit;
end;
{ Read Operands }
repeat
case actasmtoken of
{ End of asm operands for this opcode }
AS_END,
AS_SEPARATOR :
break;
{ Operand delimiter }
AS_COMMA :
begin
if operandnum > Max_Operands then
Message(asmr_e_too_many_operands)
else
Inc(operandnum);
Consume(AS_COMMA);
end;
{Far constant, i.e. jmp $0000:$11111111.}
AS_COLON:
begin
is_far_const:=true;
if operandnum>1 then
message(asmr_e_too_many_operands)
else
inc(operandnum);
consume(AS_COLON);
end;
{ Type specifier }
AS_NEAR,
AS_FAR :
begin
if actasmtoken = AS_NEAR then
begin
Message(asmr_w_near_ignored);
instr.opsize:=S_NEAR;
end
else
begin
Message(asmr_w_far_ignored);
instr.opsize:=S_FAR;
end;
Consume(actasmtoken);
if actasmtoken=AS_PTR then
begin
Consume(AS_PTR);
instr.Operands[operandnum].InitRef;
end;
BuildOperand(instr.Operands[operandnum] as tx86operand,false);
end;
else
BuildOperand(instr.Operands[operandnum] as tx86operand,false);
end; { end case }
until false;
instr.ops:=operandnum;
{ Check operands }
for i:=1 to operandnum do
begin
if is_far_const and
(instr.operands[i].opr.typ<>OPR_CONSTANT) then
message(asmr_e_expr_illegal)
else
if instr.operands[i].opr.typ=OPR_NONE then
Message(asmr_e_syntax_error);
end;
{ e.g. for "push dword 1", "push word 6" }
if (instr.ops=1) and
(instr.operands[1].typesize<>0) then
instr.operands[1].setsize(instr.operands[1].typesize,false);
end;
Procedure tx86intreader.BuildConstant(constsize: byte);
var
asmsymtyp : tasmsymtype;
asmsym,
expr: string;
value : aint;
Begin
Repeat
Case actasmtoken of
AS_STRING:
Begin
{ DD and DW cases }
if constsize <> 1 then
Begin
if Not PadZero(actasmpattern,constsize) then
Message(scan_f_string_exceeds_line);
end;
expr:=actasmpattern;
Consume(AS_STRING);
Case actasmtoken of
AS_COMMA:
Consume(AS_COMMA);
AS_END,
AS_SEPARATOR: ;
else
Message(asmr_e_invalid_string_expression);
end;
ConcatString(curlist,expr);
end;
AS_PLUS,
AS_MINUS,
AS_LPAREN,
AS_NOT,
AS_INTNUM,
AS_ID :
Begin
BuildConstSymbolExpression(false,false,value,asmsym,asmsymtyp);
if asmsym<>'' then
begin
if constsize<>sizeof(aint) then
Message1(asmr_w_const32bit_for_address,asmsym);
ConcatConstSymbol(curlist,asmsym,asmsymtyp,value)
end
else
ConcatConstant(curlist,value,constsize);
end;
AS_COMMA:
begin
Consume(AS_COMMA);
end;
AS_ALIGN,
AS_DB,
AS_DW,
AS_DD,
AS_OPCODE,
AS_END,
AS_SEPARATOR:
break;
else
begin
Message(asmr_e_syn_constant);
RecoverConsume(false);
end
end;
Until false;
end;
function tx86intreader.Assemble: tlinkedlist;
Var
hl : tasmlabel;
instr : Tx86Instruction;
Begin
Message1(asmr_d_start_reading,'intel');
inexpression:=FALSE;
firsttoken:=TRUE;
{ sets up all opcode and register tables in uppercase
done in the construtor now
if not _asmsorted then
Begin
SetupTables;
_asmsorted:=TRUE;
end;
}
curlist:=TAsmList.Create;
{ setup label linked list }
LocalLabelList:=TLocalLabelList.Create;
{ start tokenizer }
c:=current_scanner.asmgetcharstart;
gettoken;
{ main loop }
repeat
case actasmtoken of
AS_LLABEL:
Begin
if CreateLocalLabel(actasmpattern,hl,true) then
ConcatLabel(curlist,hl);
Consume(AS_LLABEL);
end;
AS_LABEL:
Begin
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
inexpression:=true;
Consume(AS_DW);
BuildConstant(2);
inexpression:=false;
end;
AS_DB :
Begin
inexpression:=true;
Consume(AS_DB);
BuildConstant(1);
inexpression:=false;
end;
AS_DD :
Begin
inexpression:=true;
Consume(AS_DD);
BuildConstant(4);
inexpression:=false;
end;
AS_ALIGN:
Begin
Consume(AS_ALIGN);
ConcatAlign(curlist,BuildConstExpression);
if actasmtoken<>AS_SEPARATOR then
Consume(AS_SEPARATOR);
end;
AS_OPCODE :
Begin
instr:=Tx86Instruction.Create(Tx86Operand);
BuildOpcode(instr);
with instr do
begin
{ We need AT&T style operands }
Swapoperands;
{ Must be done with args in ATT order }
CheckNonCommutativeOpcodes;
AddReferenceSizes;
SetInstructionOpsize;
CheckOperandSizes;
ConcatInstruction(curlist);
end;
instr.Free;
end;
AS_SEPARATOR :
Begin
Consume(AS_SEPARATOR);
end;
AS_END :
break; { end assembly block }
else
Begin
Message(asmr_e_syntax_error);
RecoverConsume(false);
end;
end; { end case }
until false;
{ Check LocalLabelList }
LocalLabelList.CheckEmitted;
LocalLabelList.Free;
{ Return the list in an asmnode }
assemble:=curlist;
Message1(asmr_d_finish_reading,'intel');
end;
end.
syntax highlighted by Code2HTML, v. 0.9.1