{
Copyright (c) 1998-2002 by Carl Eric Codere and Peter Vreman
This unit implements some support routines for assembler parsing
independent of the processor
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 RAUtils;
{$i fpcdefs.inc}
Interface
Uses
cutils,cclasses,
globtype,aasmbase,aasmtai,aasmdata,cpubase,cpuinfo,cgbase,cgutils,
symconst,symbase,symtype,symdef,symsym;
Const
RPNMax = 10; { I think you only need 4, but just to be safe }
OpMax = 25;
{---------------------------------------------------------------------
Local Label Management
---------------------------------------------------------------------}
Type
{ Each local label has this structure associated with it }
TLocalLabel = class(TFPHashObject)
Emitted : boolean;
constructor Create(AList:TFPHashObjectList;const n:string);
function Gettasmlabel:tasmlabel;
private
lab : tasmlabel;
end;
TLocalLabelList = class(TFPHashObjectList)
procedure CheckEmitted;
end;
var
LocalLabelList : TLocalLabelList;
function CreateLocalLabel(const s: string; var hl: tasmlabel; emit:boolean):boolean;
Function SearchLabel(const s: string; var hl: tasmlabel;emit:boolean): boolean;
{---------------------------------------------------------------------
Instruction management
---------------------------------------------------------------------}
type
TOprType=(OPR_NONE,OPR_CONSTANT,OPR_SYMBOL,OPR_LOCAL,
OPR_REFERENCE,OPR_REGISTER,OPR_REGLIST,OPR_COND,OPR_REGSET,OPR_SHIFTEROP);
TOprRec = record
case typ:TOprType of
OPR_NONE : ();
OPR_CONSTANT : (val:aint);
OPR_SYMBOL : (symbol:tasmsymbol;symofs:aint);
OPR_REFERENCE : (ref:treference);
OPR_LOCAL : (localsym:tabstractnormalvarsym;localsymofs:aint;localindexreg:tregister;localscale:byte;localgetoffset,localforceref:boolean);
OPR_REGISTER : (reg:tregister);
{$ifdef m68k}
OPR_REGLIST : (regset : tcpuregisterset);
{$endif m68k}
{$ifdef powerpc}
OPR_COND : (cond : tasmcond);
{$endif powerpc}
{$ifdef POWERPC64}
OPR_COND : (cond : tasmcond);
{$endif POWERPC64}
{$ifdef arm}
OPR_REGSET : (regset : tcpuregisterset);
OPR_SHIFTEROP : (shifterop : tshifterop);
{$endif arm}
end;
TOperand = class
typesize : aint;
hastype, { if the operand has typecasted variable }
hasvar : boolean; { if the operand is loaded with a variable }
size : TCGSize;
opr : TOprRec;
constructor create;virtual;
destructor destroy;override;
Procedure SetSize(_size:longint;force:boolean);virtual;
Procedure SetCorrectSize(opcode:tasmop);virtual;
Function SetupResult:boolean;virtual;
Function SetupSelf:boolean;
Function SetupOldEBP:boolean;
Function SetupVar(const s:string;GetOffset : boolean): Boolean;
Procedure CheckOperand; virtual;
Procedure InitRef;
end;
TCOperand = class of TOperand;
TInstruction = class
opcode : tasmop;
condition : tasmcond;
ops : byte;
labeled : boolean;
operands : array[1..max_operands] of toperand;
constructor create(optype : tcoperand);virtual;
destructor destroy;override;
{ converts the instruction to an instruction how it's used by the assembler writer
and concats it to the passed list, the newly created item is returned }
function ConcatInstruction(p:TAsmList) : tai;virtual;
Procedure Swapoperands;
end;
{---------------------------------------------------------------------}
{ Expression parser types }
{---------------------------------------------------------------------}
TExprOperator = record
ch: char; { operator }
is_prefix: boolean; { was it a prefix, possible prefixes are +,- and not }
end;
{**********************************************************************}
{ The following operators are supported: }
{ '+' : addition }
{ '-' : subtraction }
{ '*' : multiplication }
{ '/' : modulo division }
{ '^' : exclusive or }
{ '<' : shift left }
{ '>' : shift right }
{ '&' : bitwise and }
{ '|' : bitwise or }
{ '~' : bitwise complement }
{ '%' : modulo division }
{ nnn: longint numbers }
{ ( and ) parenthesis }
{**********************************************************************}
TExprParse = class
public
Constructor create;
Destructor Destroy;override;
Function Evaluate(Expr: String): aint;
Function Priority(_Operator: Char): aint;
private
RPNStack : Array[1..RPNMax] of aint; { Stack For RPN calculator }
RPNTop : aint;
OpStack : Array[1..OpMax] of TExprOperator; { Operator stack For conversion }
OpTop : aint;
Procedure RPNPush(Num: aint);
Function RPNPop: aint;
Procedure RPNCalc(const token: String; prefix: boolean);
Procedure OpPush(_Operator: char; prefix: boolean);
{ In reality returns TExprOperaotr }
Procedure OpPop(var _Operator:TExprOperator);
end;
{ Evaluate an expression string to a aint }
Function CalculateExpression(const expression: string): aint;
{---------------------------------------------------------------------}
{ String routines }
{---------------------------------------------------------------------}
Function ParseVal(const S:String;base:byte):aint;
Function PadZero(Var s: String; n: byte): Boolean;
Function EscapeToPascal(const s:string): string;
{---------------------------------------------------------------------
Symbol helper routines
---------------------------------------------------------------------}
procedure AsmSearchSym(const s:string;var srsym:tsym;var srsymtable:TSymtable);
Function GetRecordOffsetSize(s:string;Var Offset: aint;var Size:aint; var mangledname: string; needvmtofs: boolean):boolean;
Function SearchType(const hs:string;var size:aint): Boolean;
Function SearchRecordType(const s:string): boolean;
Function SearchIConstant(const s:string; var l:aint): boolean;
{---------------------------------------------------------------------
Instruction generation routines
---------------------------------------------------------------------}
Procedure ConcatPasString(p : TAsmList;s:string);
Procedure ConcatLabel(p: TAsmList;var l : tasmlabel);
Procedure ConcatConstant(p : TAsmList;value: aint; constsize:byte);
Procedure ConcatConstSymbol(p : TAsmList;const sym:string;symtyp:tasmsymtype;l:aint);
Procedure ConcatRealConstant(p : TAsmList;value: bestreal; real_typ : tfloattype);
Procedure ConcatString(p : TAsmList;s:string);
procedure ConcatAlign(p:TAsmList;l:aint);
Procedure ConcatPublic(p:TAsmList;const s : string);
Procedure ConcatLocal(p:TAsmList;const s : string);
Implementation
uses
SysUtils,
defutil,systems,verbose,globals,
symtable,paramgr,
aasmcpu,
procinfo;
{*************************************************************************
TExprParse
*************************************************************************}
Constructor TExprParse.create;
Begin
end;
Procedure TExprParse.RPNPush(Num : aint);
{ Add an operand to the top of the RPN stack }
begin
if RPNTop < RPNMax then
begin
Inc(RPNTop);
RPNStack[RPNTop]:=Num;
end
else
Message(asmr_e_expr_illegal);
end;
Function TExprParse.RPNPop : aint;
{ Get the operand at the top of the RPN stack }
begin
if RPNTop > 0 then
begin
RPNPop:=RPNStack[RPNTop];
Dec(RPNTop);
end
else
Message(asmr_e_expr_illegal);
end;
Procedure TExprParse.RPNCalc(const Token : String; prefix:boolean); { RPN Calculator }
Var
Temp : aint;
n1,n2 : aint;
LocalError : Integer;
begin
{ Handle operators }
if (Length(Token) = 1) and (Token[1] in ['+', '-', '*', '/','&','|','%','^','~','<','>']) then
Case Token[1] of
'+' :
Begin
if not prefix then
RPNPush(RPNPop + RPNPop);
end;
'-' :
Begin
if prefix then
RPNPush(-(RPNPop))
else
begin
n1:=RPNPop;
n2:=RPNPop;
RPNPush(n2 - n1);
end;
end;
'*' : RPNPush(RPNPop * RPNPop);
'&' :
begin
n1:=RPNPop;
n2:=RPNPop;
RPNPush(n2 and n1);
end;
'|' :
begin
n1:=RPNPop;
n2:=RPNPop;
RPNPush(n2 or n1);
end;
'~' : RPNPush(NOT RPNPop);
'<' :
begin
n1:=RPNPop;
n2:=RPNPop;
RPNPush(n2 SHL n1);
end;
'>' :
begin
n1:=RPNPop;
n2:=RPNPop;
RPNPush(n2 SHR n1);
end;
'%' :
begin
Temp:=RPNPop;
if Temp <> 0 then
RPNPush(RPNPop mod Temp)
else
begin
Message(asmr_e_expr_zero_divide);
{ push 1 for error recovery }
RPNPush(1);
end;
end;
'^' : RPNPush(RPNPop XOR RPNPop);
'/' :
begin
Temp:=RPNPop;
if Temp <> 0 then
RPNPush(RPNPop div Temp)
else
begin
Message(asmr_e_expr_zero_divide);
{ push 1 for error recovery }
RPNPush(1);
end;
end;
end
else
begin
{ Convert String to number and add to stack }
Val(Token, Temp, LocalError);
if LocalError = 0 then
RPNPush(Temp)
else
begin
Message(asmr_e_expr_illegal);
{ push 1 for error recovery }
RPNPush(1);
end;
end;
end;
Procedure TExprParse.OpPush(_Operator : char;prefix: boolean);
{ Add an operator onto top of the stack }
begin
if OpTop < OpMax then
begin
Inc(OpTop);
OpStack[OpTop].ch:=_Operator;
OpStack[OpTop].is_prefix:=prefix;
end
else
Message(asmr_e_expr_illegal);
end;
Procedure TExprParse.OpPop(var _Operator:TExprOperator);
{ Get operator at the top of the stack }
begin
if OpTop > 0 then
begin
_Operator:=OpStack[OpTop];
Dec(OpTop);
end
else
Message(asmr_e_expr_illegal);
end;
Function TExprParse.Priority(_Operator : Char) : aint;
{ Return priority of operator }
{ The greater the priority, the higher the precedence }
begin
Case _Operator OF
'(' :
Priority:=0;
'+', '-' :
Priority:=1;
'*', '/','%','<','>' :
Priority:=2;
'|','&','^','~' :
Priority:=0;
else
Message(asmr_e_expr_illegal);
end;
end;
Function TExprParse.Evaluate(Expr : String):aint;
Var
I : longint;
Token : String;
opr : TExprOperator;
begin
Evaluate:=0;
{ Reset stacks }
OpTop :=0;
RPNTop:=0;
Token :='';
{ nothing to do ? }
if Expr='' then
exit;
For I:=1 to Length(Expr) DO
begin
if Expr[I] in ['0'..'9'] then
begin { Build multi-digit numbers }
Token:=Token + Expr[I];
if I = Length(Expr) then { Send last one to calculator }
RPNCalc(Token,false);
end
else
if Expr[I] in ['+', '-', '*', '/', '(', ')','^','&','|','%','~','<','>'] then
begin
if Token <> '' then
begin { Send last built number to calc. }
RPNCalc(Token,false);
Token:='';
end;
Case Expr[I] OF
'(' : OpPush('(',false);
')' : begin
While (OpTop>0) and (OpStack[OpTop].ch <> '(') DO
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
OpPop(opr); { Pop off and ignore the '(' }
end;
'+','-','~' : Begin
{ workaround for -2147483648 }
if (expr[I]='-') and (expr[i+1] in ['0'..'9']) then
begin
token:='-';
expr[i]:='+';
end;
{ if start of expression then surely a prefix }
{ or if previous char was also an operator }
if (I = 1) or (not (Expr[I-1] in ['0'..'9','(',')'])) then
OpPush(Expr[I],true)
else
Begin
{ Evaluate all higher priority operators }
While (OpTop > 0) AND (Priority(Expr[I]) <= Priority(OpStack[OpTop].ch)) DO
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
OpPush(Expr[I],false);
End;
end;
'*', '/',
'^','|','&',
'%','<','>' : begin
While (OpTop > 0) and (Priority(Expr[I]) <= Priority(OpStack[OpTop].ch)) DO
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
OpPush(Expr[I],false);
end;
end; { Case }
end
else
Message(asmr_e_expr_illegal); { Handle bad input error }
end;
{ Pop off the remaining operators }
While OpTop > 0 do
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
{ The result is stored on the top of the stack }
Evaluate:=RPNPop;
end;
Destructor TExprParse.Destroy;
Begin
end;
Function CalculateExpression(const expression: string): aint;
var
expr: TExprParse;
Begin
expr:=TExprParse.create;
CalculateExpression:=expr.Evaluate(expression);
expr.Free;
end;
{*************************************************************************}
{ String conversions/utils }
{*************************************************************************}
Function EscapeToPascal(const s:string): string;
{ converts a C styled string - which contains escape }
{ characters to a pascal style string. }
var
i,len : aint;
hs : string;
temp : string;
c : char;
Begin
hs:='';
len:=0;
i:=0;
while (i<length(s)) and (len<255) do
begin
Inc(i);
if (s[i]='\') and (i<length(s)) then
Begin
inc(i);
case s[i] of
'\' :
c:='\';
'b':
c:=#8;
'f':
c:=#12;
'n':
c:=#10;
'r':
c:=#13;
't':
c:=#9;
'"':
c:='"';
'0'..'7':
Begin
temp:=s[i];
temp:=temp+s[i+1];
temp:=temp+s[i+2];
inc(i,2);
c:=chr(ParseVal(temp,8));
end;
'x':
Begin
temp:=s[i+1];
temp:=temp+s[i+2];
inc(i,2);
c:=chr(ParseVal(temp,16));
end;
else
Begin
Message1(asmr_e_escape_seq_ignored,s[i]);
c:=s[i];
end;
end;
end
else
c:=s[i];
inc(len);
hs[len]:=c;
end;
hs[0]:=chr(len);
EscapeToPascal:=hs;
end;
Function ParseVal(const S:String;base:byte):aint;
{ Converts a decimal string to aint }
var
code : integer;
errmsg : word;
prefix : string[2];
Begin
case base of
2 :
begin
errmsg:=asmr_e_error_converting_binary;
prefix:='%';
end;
8 :
begin
errmsg:=asmr_e_error_converting_octal;
prefix:='&';
end;
10 :
begin
errmsg:=asmr_e_error_converting_decimal;
prefix:='';
end;
16 :
begin
errmsg:=asmr_e_error_converting_hexadecimal;
prefix:='$';
end;
else
internalerror(200501202);
end;
val(prefix+s,result,code);
if code<>0 then
begin
val(prefix+s,aword(result),code);
if code<>0 then
begin
Message1(errmsg,s);
result:=0;
end;
end;
end;
Function PadZero(Var s: String; n: byte): Boolean;
Begin
PadZero:=TRUE;
{ Do some error checking first }
if Length(s) = n then
exit
else
if Length(s) > n then
Begin
PadZero:=FALSE;
delete(s,n+1,length(s));
exit;
end
else
PadZero:=TRUE;
{ Fill it up with the specified character }
fillchar(s[length(s)+1],n-1,#0);
s[0]:=chr(n);
end;
{****************************************************************************
TOperand
****************************************************************************}
constructor TOperand.Create;
begin
size:=OS_NO;
hastype:=false;
hasvar:=false;
FillChar(Opr,sizeof(Opr),0);
end;
destructor TOperand.destroy;
begin
end;
Procedure TOperand.SetSize(_size:longint;force:boolean);
begin
if force or
((size = OS_NO) and (_size<=16)) then
Begin
case _size of
1 : size:=OS_8;
2 : size:=OS_16{ could be S_IS};
4 : size:=OS_32{ could be S_IL or S_FS};
8 : size:=OS_64{ could be S_D or S_FL};
10 : size:=OS_F80;
16 : size:=OS_128;
end;
end;
end;
Procedure TOperand.SetCorrectSize(opcode:tasmop);
begin
end;
function TOperand.SetupResult:boolean;
begin
SetupResult:=false;
{ replace by correct offset. }
with current_procinfo.procdef do
if (not is_void(returndef)) then
begin
if (m_tp7 in current_settings.modeswitches) and
(not paramanager.ret_in_param(returndef,proccalloption)) then
begin
message(asmr_e_cannot_use_RESULT_here);
exit;
end;
SetupResult:=setupvar('result',false)
end
else
message(asmr_e_void_function);
end;
Function TOperand.SetupSelf:boolean;
Begin
SetupSelf:=false;
if assigned(current_procinfo.procdef._class) then
SetupSelf:=setupvar('self',false)
else
Message(asmr_e_cannot_use_SELF_outside_a_method);
end;
Function TOperand.SetupOldEBP:boolean;
Begin
SetupOldEBP:=false;
if current_procinfo.procdef.parast.symtablelevel>normal_function_level then
SetupOldEBP:=setupvar('parentframe',false)
else
Message(asmr_e_cannot_use_OLDEBP_outside_nested_procedure);
end;
Function TOperand.SetupVar(const s:string;GetOffset : boolean): Boolean;
function symtable_has_localvarsyms(st:TSymtable):boolean;
var
sym : tsym;
i : longint;
begin
result:=false;
for i:=0 to st.SymList.Count-1 do
begin
sym:=tsym(st.SymList[i]);
if sym.typ=localvarsym then
begin
result:=true;
exit;
end;
end;
end;
procedure setconst(l:aint);
begin
{ We return the address of the field, just like Delphi/TP }
case opr.typ of
OPR_NONE :
begin
opr.typ:=OPR_CONSTANT;
opr.val:=l;
end;
OPR_CONSTANT :
inc(opr.val,l);
OPR_REFERENCE :
inc(opr.ref.offset,l);
OPR_LOCAL :
inc(opr.localsymofs,l);
else
Message(asmr_e_invalid_operand_type);
end;
end;
{ search and sets up the correct fields in the Instr record }
{ for the NON-constant identifier passed to the routine. }
{ if not found returns FALSE. }
var
sym : tsym;
srsymtable : TSymtable;
harrdef : tarraydef;
indexreg : tregister;
l : aint;
plist : ppropaccesslistitem;
Begin
SetupVar:=false;
asmsearchsym(s,sym,srsymtable);
if sym = nil then
exit;
if sym.typ=absolutevarsym then
begin
if (tabsolutevarsym(sym).abstyp=tovar) then
begin
{ Only support simple loads }
plist:=tabsolutevarsym(sym).ref.firstsym;
if assigned(plist) and
(plist^.sltype=sl_load) then
sym:=plist^.sym
else
begin
Message(asmr_e_unsupported_symbol_type);
exit;
end;
end
else
begin
Message(asmr_e_unsupported_symbol_type);
exit;
end;
end;
case sym.typ of
fieldvarsym :
begin
setconst(tfieldvarsym(sym).fieldoffset);
hasvar:=true;
SetupVar:=true;
end;
staticvarsym,
localvarsym,
paravarsym :
begin
{ we always assume in asm statements that }
{ that the variable is valid. }
tabstractvarsym(sym).varstate:=vs_readwritten;
inc(tabstractvarsym(sym).refs);
{ variable can't be placed in a register }
tabstractvarsym(sym).varregable:=vr_none;
case sym.typ of
staticvarsym :
begin
initref;
opr.ref.symbol:=current_asmdata.RefAsmSymbol(tstaticvarsym(sym).mangledname);
end;
paravarsym,
localvarsym :
begin
if opr.typ=OPR_REFERENCE then
begin
indexreg:=opr.ref.base;
if opr.ref.index<>NR_NO then
begin
if indexreg=NR_NO then
indexreg:=opr.ref.index
else
Message(asmr_e_multiple_index);
end;
end
else
indexreg:=NR_NO;
opr.typ:=OPR_LOCAL;
if assigned(current_procinfo.parent) and
not(po_inline in current_procinfo.procdef.procoptions) and
(sym.owner<>current_procinfo.procdef.localst) and
(sym.owner<>current_procinfo.procdef.parast) and
(current_procinfo.procdef.localst.symtablelevel>normal_function_level) and
symtable_has_localvarsyms(current_procinfo.procdef.localst) then
message1(asmr_e_local_para_unreachable,s);
opr.localsym:=tabstractnormalvarsym(sym);
opr.localsymofs:=0;
opr.localindexreg:=indexreg;
opr.localscale:=0;
opr.localgetoffset:=GetOffset;
if paramanager.push_addr_param(tabstractvarsym(sym).varspez,tabstractvarsym(sym).vardef,current_procinfo.procdef.proccalloption) then
SetSize(sizeof(aint),false);
end;
end;
case tabstractvarsym(sym).vardef.typ of
orddef,
enumdef,
pointerdef,
floatdef :
SetSize(tabstractvarsym(sym).getsize,false);
arraydef :
begin
{ for arrays try to get the element size, take care of
multiple indexes }
harrdef:=tarraydef(tabstractvarsym(sym).vardef);
while assigned(harrdef.elementdef) and
(harrdef.elementdef.typ=arraydef) do
harrdef:=tarraydef(harrdef.elementdef);
if not is_packed_array(harrdef) then
SetSize(harrdef.elesize,false)
else
begin
if (harrdef.elepackedbitsize mod 8) = 0 then
SetSize(harrdef.elepackedbitsize div 8,false);
end;
end;
end;
hasvar:=true;
SetupVar:=true;
Exit;
end;
constsym :
begin
if tconstsym(sym).consttyp=constord then
begin
setconst(tconstsym(sym).value.valueord);
SetupVar:=true;
Exit;
end;
end;
typesym :
begin
if ttypesym(sym).typedef.typ in [recorddef,objectdef] then
begin
setconst(0);
SetupVar:=TRUE;
Exit;
end;
end;
procsym :
begin
if opr.typ<>OPR_NONE then
Message(asmr_e_invalid_operand_type);
if Tprocsym(sym).ProcdefList.Count>1 then
Message(asmr_w_calling_overload_func);
l:=opr.ref.offset;
opr.typ:=OPR_SYMBOL;
opr.symbol:=current_asmdata.RefAsmSymbol(tprocdef(tprocsym(sym).ProcdefList[0]).mangledname);
opr.symofs:=l;
hasvar:=true;
SetupVar:=TRUE;
Exit;
end;
else
begin
Message(asmr_e_unsupported_symbol_type);
exit;
end;
end;
end;
procedure TOperand.InitRef;
{*********************************************************************}
{ Description: This routine first check if the opcode is of }
{ type OPR_NONE, or OPR_REFERENCE , if not it gives out an error. }
{ If the operandtype = OPR_NONE or <> OPR_REFERENCE then it sets up }
{ the operand type to OPR_REFERENCE, as well as setting up the ref }
{ to point to the default segment. }
{*********************************************************************}
var
l : aint;
hsymofs : aint;
hsymbol : tasmsymbol;
reg : tregister;
Begin
case opr.typ of
OPR_REFERENCE :
exit;
OPR_CONSTANT :
begin
l:=opr.val;
opr.typ:=OPR_REFERENCE;
Fillchar(opr.ref,sizeof(treference),0);
opr.Ref.Offset:=l;
end;
OPR_NONE :
begin
opr.typ:=OPR_REFERENCE;
Fillchar(opr.ref,sizeof(treference),0);
end;
OPR_REGISTER :
begin
reg:=opr.reg;
opr.typ:=OPR_REFERENCE;
Fillchar(opr.ref,sizeof(treference),0);
opr.Ref.base:=reg;
end;
OPR_SYMBOL :
begin
hsymbol:=opr.symbol;
hsymofs:=opr.symofs;
opr.typ:=OPR_REFERENCE;
Fillchar(opr.ref,sizeof(treference),0);
opr.ref.symbol:=hsymbol;
opr.ref.offset:=hsymofs;
end;
else
begin
Message(asmr_e_invalid_operand_type);
{ Recover }
opr.typ:=OPR_REFERENCE;
Fillchar(opr.ref,sizeof(treference),0);
end;
end;
end;
Procedure TOperand.CheckOperand;
{*********************************************************************}
{ Description: This routine checks if the operand is of }
{ valid. Does nothing by default. }
{*********************************************************************}
begin
end;
{****************************************************************************
TInstruction
****************************************************************************}
constructor TInstruction.create(optype : tcoperand);
var
i : longint;
Begin
{ these field are set to 0 anyways by the constructor helper (FK)
Opcode:=A_NONE;
Condition:=C_NONE;
Ops:=0;
}
for i:=1 to max_operands do
Operands[i]:=optype.create;
Labeled:=false;
end;
destructor TInstruction.destroy;
var
i : longint;
Begin
for i:=1 to max_operands do
Operands[i].free;
end;
Procedure TInstruction.Swapoperands;
Var
p : toperand;
Begin
case Ops of
2 :
begin
p:=Operands[1];
Operands[1]:=Operands[2];
Operands[2]:=p;
end;
3 :
begin
p:=Operands[1];
Operands[1]:=Operands[3];
Operands[3]:=p;
end;
end;
end;
function TInstruction.ConcatInstruction(p:TAsmList) : tai;
var
ai : taicpu;
i : longint;
begin
for i:=1 to Ops do
operands[i].CheckOperand;
ai:=taicpu.op_none(opcode);
ai.Ops:=Ops;
ai.Allocate_oper(Ops);
for i:=1 to Ops do
with operands[i].opr do
begin
case typ of
OPR_CONSTANT :
ai.loadconst(i-1,val);
OPR_REGISTER:
ai.loadreg(i-1,reg);
OPR_SYMBOL:
ai.loadsymbol(i-1,symbol,symofs);
OPR_LOCAL :
ai.loadlocal(i-1,localsym,localsymofs,localindexreg,
localscale,localgetoffset,localforceref);
OPR_REFERENCE:
ai.loadref(i-1,ref);
{$ifdef ARM}
OPR_REGSET:
ai.loadregset(i-1,regset);
OPR_SHIFTEROP:
ai.loadshifterop(i-1,shifterop);
{$endif ARM}
else
internalerror(200501051);
end;
end;
ai.SetCondition(condition);
{ Concat the opcode or give an error }
if assigned(ai) then
p.concat(ai)
else
Message(asmr_e_invalid_opcode_and_operand);
result:=ai;
end;
{***************************************************************************
TLocalLabel
***************************************************************************}
constructor TLocalLabel.create(AList:TFPHashObjectList;const n:string);
begin
inherited Create(AList,n);
lab:=nil;
emitted:=false;
end;
function TLocalLabel.Gettasmlabel:tasmlabel;
begin
if not assigned(lab) then
begin
current_asmdata.getjumplabel(lab);
{ this label is forced to be used so it's always written }
lab.increfs;
end;
Gettasmlabel:=lab;
end;
{***************************************************************************
TLocalLabelList
***************************************************************************}
procedure TLocalLabelList.CheckEmitted;
var
i : longint;
lab : TLocalLabel;
begin
for i:=0 to LocalLabelList.Count-1 do
begin
lab:=TLocalLabel(LocalLabelList[i]);
if not lab.emitted then
Message1(asmr_e_unknown_label_identifier,lab.name);
end;
end;
function CreateLocalLabel(const s: string; var hl: tasmlabel; emit:boolean):boolean;
var
lab : TLocalLabel;
Begin
CreateLocalLabel:=true;
{ Check if it already is defined }
lab:=TLocalLabel(LocalLabellist.Find(s));
if not assigned(lab) then
lab:=TLocalLabel.Create(LocalLabellist,s);
{ set emitted flag and check for dup syms }
if emit then
begin
if lab.Emitted then
begin
Message1(asmr_e_dup_local_sym,lab.Name);
CreateLocalLabel:=false;
end;
lab.Emitted:=true;
end;
hl:=lab.Gettasmlabel;
end;
{****************************************************************************
Symbol table helper routines
****************************************************************************}
procedure AsmSearchSym(const s:string;var srsym:tsym;var srsymtable:TSymtable);
var
i : integer;
begin
i:=pos('.',s);
{ allow unit.identifier }
if i>0 then
begin
searchsym(Copy(s,1,i-1),srsym,srsymtable);
if assigned(srsym) then
begin
if (srsym.typ=unitsym) and
(srsym.owner.symtabletype in [staticsymtable,globalsymtable]) and
srsym.owner.iscurrentunit then
searchsym_in_module(tunitsym(srsym).module,Copy(s,i+1,255),srsym,srsymtable)
else
begin
srsym:=nil;
srsymtable:=nil;
end;
end;
end
else
searchsym(s,srsym,srsymtable);
end;
Function SearchType(const hs:string;var size:aint): Boolean;
var
srsym : tsym;
srsymtable : TSymtable;
begin
result:=false;
size:=0;
asmsearchsym(hs,srsym,srsymtable);
if assigned(srsym) and
(srsym.typ=typesym) then
begin
size:=ttypesym(srsym).typedef.size;
result:=true;
end;
end;
Function SearchRecordType(const s:string): boolean;
var
srsym : tsym;
srsymtable : TSymtable;
Begin
SearchRecordType:=false;
{ Check the constants in symtable }
asmsearchsym(s,srsym,srsymtable);
if srsym <> nil then
Begin
case srsym.typ of
typesym :
begin
if ttypesym(srsym).typedef.typ in [recorddef,objectdef] then
begin
SearchRecordType:=true;
exit;
end;
end;
fieldvarsym :
begin
if (tfieldvarsym(srsym).vardef.typ in [recorddef,objectdef]) then
begin
SearchRecordType:=true;
exit;
end;
end;
end;
end;
end;
Function SearchIConstant(const s:string; var l:aint): boolean;
{**********************************************************************}
{ Description: Searches for a CONSTANT of name s in either the local }
{ symbol list, then in the global symbol list, and returns the value }
{ of that constant in l. Returns TRUE if successfull, if not found, }
{ or if the constant is not of correct type, then returns FALSE }
{ Remarks: Also handle TRUE and FALSE returning in those cases 1 and 0 }
{ respectively. }
{**********************************************************************}
var
srsym : tsym;
srsymtable : TSymtable;
Begin
SearchIConstant:=false;
{ check for TRUE or FALSE reserved words first }
if s = 'TRUE' then
Begin
SearchIConstant:=TRUE;
l:=1;
exit;
end;
if s = 'FALSE' then
Begin
SearchIConstant:=TRUE;
l:=0;
exit;
end;
{ Check the constants in symtable }
asmsearchsym(s,srsym,srsymtable);
if srsym <> nil then
Begin
case srsym.typ of
constsym :
begin
if tconstsym(srsym).consttyp=constord then
Begin
l:=tconstsym(srsym).value.valueord;
SearchIConstant:=TRUE;
exit;
end;
end;
enumsym:
Begin
l:=tenumsym(srsym).value;
SearchIConstant:=TRUE;
exit;
end;
end;
end;
end;
Function GetRecordOffsetSize(s:string;Var Offset: aint;var Size:aint; var mangledname: string; needvmtofs: boolean):boolean;
{ search and returns the offset and size of records/objects of the base }
{ with field name setup in field. }
{ returns FALSE if not found. }
{ used when base is a variable or a typed constant name. }
var
st : TSymtable;
harrdef : tarraydef;
sym : tsym;
srsymtable : TSymtable;
i : longint;
base : string;
procdef: tprocdef;
Begin
GetRecordOffsetSize:=FALSE;
Offset:=0;
Size:=0;
mangledname:='';
i:=pos('.',s);
if i=0 then
i:=255;
base:=Copy(s,1,i-1);
delete(s,1,i);
if base='SELF' then
st:=current_procinfo.procdef._class.symtable
else
begin
asmsearchsym(base,sym,srsymtable);
st:=nil;
{ we can start with a var,type,typedconst }
if assigned(sym) then
case sym.typ of
staticvarsym,
localvarsym,
paravarsym :
st:=Tabstractvarsym(sym).vardef.GetSymtable(gs_record);
typesym :
st:=Ttypesym(sym).typedef.GetSymtable(gs_record);
end
else
s:='';
end;
{ now walk all recordsymtables }
while assigned(st) and (s<>'') do
begin
{ load next field in base }
i:=pos('.',s);
if i=0 then
i:=255;
base:=Copy(s,1,i-1);
delete(s,1,i);
if st.symtabletype=ObjectSymtable then
sym:=search_class_member(tobjectdef(st.defowner),base)
else
sym:=tsym(st.Find(base));
if not assigned(sym) then
begin
GetRecordOffsetSize:=false;
exit;
end;
st:=nil;
case sym.typ of
fieldvarsym :
with Tfieldvarsym(sym) do
begin
inc(Offset,fieldoffset);
size:=getsize;
case vardef.typ of
arraydef :
begin
{ for arrays try to get the element size, take care of
multiple indexes }
harrdef:=tarraydef(vardef);
while assigned(harrdef.elementdef) and
(harrdef.elementdef.typ=arraydef) do
harrdef:=tarraydef(harrdef.elementdef);
if not is_packed_array(harrdef) then
size:=harrdef.elesize
else
begin
if (harrdef.elepackedbitsize mod 8) <> 0 then
Message(asmr_e_packed_element);
size := (harrdef.elepackedbitsize + 7) div 8;
end;
end;
recorddef :
st:=trecorddef(vardef).symtable;
objectdef :
st:=tobjectdef(vardef).symtable;
end;
end;
procsym:
begin
st:=nil;
if Tprocsym(sym).ProcdefList.Count>1 then
Message(asmr_w_calling_overload_func);
procdef:=tprocdef(tprocsym(sym).ProcdefList[0]);
if (not needvmtofs) then
begin
mangledname:=procdef.mangledname;
end
else
begin
{ can only get the vmtoffset of virtual methods }
if not(po_virtualmethod in procdef.procoptions) then
Message1(asmr_e_no_vmtoffset_possible,FullTypeName(procdef,nil))
else
begin
{ size = sizeof(target_system_pointer) }
size:=sizeof(aint);
offset:=procdef._class.vmtmethodoffset(procdef.extnumber)
end;
end;
{ if something comes after the procsym, it's invalid assembler syntax }
GetRecordOffsetSize:=(s='');
exit;
end;
end;
end;
{ Support Field.Type as typecasting }
if (st=nil) and (s<>'') then
begin
asmsearchsym(s,sym,srsymtable);
if assigned(sym) and (sym.typ=typesym) then
begin
size:=ttypesym(sym).typedef.size;
s:=''
end;
end;
GetRecordOffsetSize:=(s='');
end;
Function SearchLabel(const s: string; var hl: tasmlabel;emit:boolean): boolean;
var
sym : tsym;
srsymtable : TSymtable;
hs : string;
Begin
hl:=nil;
SearchLabel:=false;
{ Check for pascal labels, which are case insensetive }
hs:=upper(s);
asmsearchsym(hs,sym,srsymtable);
if sym=nil then
exit;
case sym.typ of
labelsym :
begin
if not(assigned(tlabelsym(sym).asmblocklabel)) then
current_asmdata.getjumplabel(tlabelsym(sym).asmblocklabel);
hl:=tlabelsym(sym).asmblocklabel;
if emit then
tlabelsym(sym).defined:=true
else
tlabelsym(sym).used:=true;
SearchLabel:=true;
end;
end;
end;
{*************************************************************************}
{ Instruction Generation Utilities }
{*************************************************************************}
Procedure ConcatString(p : TAsmList;s:string);
{*********************************************************************}
{ PROCEDURE ConcatString(s:string); }
{ Description: This routine adds the character chain pointed to in }
{ s to the instruction linked list. }
{*********************************************************************}
Var
pc: PChar;
Begin
getmem(pc,length(s)+1);
p.concat(Tai_string.Create_pchar(strpcopy(pc,s),length(s)));
end;
Procedure ConcatPasString(p : TAsmList;s:string);
{*********************************************************************}
{ PROCEDURE ConcatPasString(s:string); }
{ Description: This routine adds the character chain pointed to in }
{ s to the instruction linked list, contrary to ConcatString it }
{ uses a pascal style string, so it conserves null characters. }
{*********************************************************************}
Begin
p.concat(Tai_string.Create(s));
end;
Procedure ConcatConstant(p: TAsmList; value: aint; constsize:byte);
{*********************************************************************}
{ PROCEDURE ConcatConstant(value: aint; maxvalue: aint); }
{ Description: This routine adds the value constant to the current }
{ instruction linked list. }
{ maxvalue -> indicates the size of the data to initialize: }
{ $ff -> create a byte node. }
{ $ffff -> create a word node. }
{ $ffffffff -> create a dword node. }
{*********************************************************************}
var
rangelo,rangehi : int64;
Begin
case constsize of
1 :
begin
p.concat(Tai_const.Create_8bit(byte(value)));
rangelo:=low(shortint);
rangehi:=high(byte);
end;
2 :
begin
p.concat(Tai_const.Create_16bit(word(value)));
rangelo:=low(smallint);
rangehi:=high(word);
end;
4 :
begin
p.concat(Tai_const.Create_32bit(longint(value)));
rangelo:=low(longint);
rangehi:=high(cardinal);
end;
8 :
begin
p.concat(Tai_const.Create_64bit(int64(value)));
rangelo:=0;
rangehi:=0;
end;
else
internalerror(200405011);
end;
{ check for out of bounds }
if (rangelo<>0) and
((value>rangehi) or (value<rangelo)) then
Message(asmr_e_constant_out_of_bounds);
end;
Procedure ConcatConstSymbol(p : TAsmList;const sym:string;symtyp:tasmsymtype;l:aint);
begin
p.concat(Tai_const.Createname(sym,l));
end;
Procedure ConcatRealConstant(p : TAsmList;value: bestreal; real_typ : tfloattype);
{***********************************************************************}
{ PROCEDURE ConcatRealConstant(value: bestreal; real_typ : tfloattype); }
{ Description: This routine adds the value constant to the current }
{ instruction linked list. }
{ real_typ -> indicates the type of the real data to initialize: }
{ s32real -> create a single node. }
{ s64real -> create a double node. }
{ s80real -> create an extended node. }
{ s64bit -> create a comp node. }
{ f32bit -> create a fixed node. (not used normally) }
{***********************************************************************}
Begin
case real_typ of
s32real : p.concat(Tai_real_32bit.Create(value));
s64real :
{$ifdef ARM}
if is_double_hilo_swapped then
p.concat(Tai_real_64bit.Create_hiloswapped(value))
else
{$endif ARM}
p.concat(Tai_real_64bit.Create(value));
s80real : p.concat(Tai_real_80bit.Create(value));
s64comp : p.concat(Tai_comp_64bit.Create(trunc(value)));
end;
end;
Procedure ConcatLabel(p: TAsmList;var l : tasmlabel);
{*********************************************************************}
{ PROCEDURE ConcatLabel }
{ Description: This routine either emits a label or a labeled }
{ instruction to the linked list of instructions. }
{*********************************************************************}
begin
p.concat(Tai_label.Create(l));
end;
procedure ConcatAlign(p:TAsmList;l:aint);
{*********************************************************************}
{ PROCEDURE ConcatPublic }
{ Description: This routine emits an global definition to the }
{ linked list of instructions.(used by AT&T styled asm) }
{*********************************************************************}
begin
p.concat(Tai_align.Create(l));
end;
procedure ConcatPublic(p:TAsmList;const s : string);
{*********************************************************************}
{ PROCEDURE ConcatPublic }
{ Description: This routine emits an global definition to the }
{ linked list of instructions.(used by AT&T styled asm) }
{*********************************************************************}
begin
p.concat(Tai_symbol.Createname_global(s,AT_LABEL,0));
end;
procedure ConcatLocal(p:TAsmList;const s : string);
{*********************************************************************}
{ PROCEDURE ConcatLocal }
{ Description: This routine emits an local definition to the }
{ linked list of instructions. }
{*********************************************************************}
begin
p.concat(Tai_symbol.Createname(s,AT_LABEL,0));
end;
end.
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