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fpc/compiler/rautils.pas

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{
$Id$
Copyright (c) 1998-2000 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;
{$i defines.inc}
Interface
Uses
cutils,cobjects,
globtype,aasm,cpubase,symconst,symdef;
Const
RPNMax = 10; { I think you only need 4, but just to be safe }
OpMax = 25;
maxoperands = 3; { Maximum operands for assembler instructions }
{---------------------------------------------------------------------
Local Label Management
---------------------------------------------------------------------}
Type
{ Each local label has this structure associated with it }
PLocalLabel = ^TLocalLabel;
TLocalLabel = object(TNamedIndexObject)
Emitted : boolean;
constructor Init(const n:string);
function Getpasmlabel:pasmlabel;
private
lab : pasmlabel;
end;
PLocalLabelList = ^TLocalLabelList;
TLocalLabelList = Object(TDictionary)
procedure CheckEmitted;
end;
var
LocalLabelList : PLocalLabelList;
function CreateLocalLabel(const s: string; var hl: pasmlabel; emit:boolean):boolean;
Function SearchLabel(const s: string; var hl: pasmlabel;emit:boolean): boolean;
{---------------------------------------------------------------------
Instruction management
---------------------------------------------------------------------}
type
TOprType=(OPR_NONE,OPR_CONSTANT,OPR_SYMBOL,
OPR_REFERENCE,OPR_REGISTER,OPR_REGLIST);
TOprRec = record
case typ:TOprType of
OPR_NONE : ();
OPR_CONSTANT : (val:longint);
OPR_SYMBOL : (symbol:PAsmSymbol;symofs:longint);
OPR_REFERENCE : (ref:treference);
OPR_REGISTER : (reg:tregister);
{$ifdef m68k}
OPR_REGLIST : (reglist:pregisterlist);
{$else not m68k}
OPR_REGLIST : ();
{$endif m68k}
end;
POperand = ^TOperand;
TOperand = object
size : topsize;
hastype, { if the operand has typecasted variable }
hasvar : boolean; { if the operand is loaded with a variable }
opr : TOprRec;
constructor init;
destructor done;virtual;
Procedure BuildOperand;virtual;
Procedure SetSize(_size:longint;force:boolean);
Procedure SetCorrectSize(opcode:tasmop);virtual;
Function SetupResult:boolean;virtual;
Function SetupSelf:boolean;
Function SetupOldEBP:boolean;
Function SetupVar(const hs:string;GetOffset : boolean): Boolean;
Function SetupDirectVar(const hs:string): Boolean;
Procedure InitRef;
end;
PInstruction = ^TInstruction;
TInstruction = object
opcode : tasmop;
opsize : topsize;
condition : tasmcond;
ops : byte;
labeled : boolean;
operands : array[1..maxoperands] of POperand;
constructor init;
destructor done;virtual;
Procedure InitOperands;virtual;
Procedure BuildOpcode;virtual;
procedure ConcatInstruction(p:TAAsmoutput);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;
String15 = String[15];
{**********************************************************************}
{ 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 = Object
public
Constructor Init;
Destructor Done;
Function Evaluate(Expr: String): longint;
Function Priority(_Operator: Char): longint; virtual;
private
RPNStack : Array[1..RPNMax] of longint; { Stack For RPN calculator }
RPNTop : longint;
OpStack : Array[1..OpMax] of TExprOperator; { Operator stack For conversion }
OpTop : longint;
Procedure RPNPush(Num: Longint);
Function RPNPop: Longint;
Procedure RPNCalc(token: String15; prefix: boolean);
Procedure OpPush(_Operator: char; prefix: boolean);
{ In reality returns TExprOperaotr }
Procedure OpPop(var _Operator:TExprOperator);
end;
{ Evaluate an expression string to a longint }
Function CalculateExpression(const expression: string): longint;
{---------------------------------------------------------------------}
{ String routines }
{---------------------------------------------------------------------}
Function ValDecimal(const S:String):longint;
Function ValOctal(const S:String):longint;
Function ValBinary(const S:String):longint;
Function ValHexaDecimal(const S:String):longint;
Function PadZero(Var s: String; n: byte): Boolean;
Function EscapeToPascal(const s:string): string;
{---------------------------------------------------------------------
Symbol helper routines
---------------------------------------------------------------------}
Function GetRecordOffsetSize(s:string;Var Offset: longint;var Size:longint):boolean;
Function SearchType(const hs:string): Boolean;
Function SearchRecordType(const s:string): boolean;
Function SearchIConstant(const s:string; var l:longint): boolean;
{---------------------------------------------------------------------
Instruction generation routines
---------------------------------------------------------------------}
Procedure ConcatPasString(p : TAAsmoutput;s:string);
Procedure ConcatDirect(p : TAAsmoutput;s:string);
Procedure ConcatLabel(p: TAAsmoutput;var l : pasmlabel);
Procedure ConcatConstant(p : TAAsmoutput;value: longint; maxvalue: longint);
Procedure ConcatConstSymbol(p : TAAsmoutput;const sym:string;l:longint);
Procedure ConcatRealConstant(p : TAAsmoutput;value: bestreal; real_typ : tfloattype);
Procedure ConcatString(p : TAAsmoutput;s:string);
procedure ConcatAlign(p:TAAsmoutput;l:longint);
Procedure ConcatPublic(p:TAAsmoutput;const s : string);
Procedure ConcatLocal(p:TAAsmoutput;const s : string);
Procedure ConcatGlobalBss(const s : string;size : longint);
Procedure ConcatLocalBss(const s : string;size : longint);
Implementation
uses
{$ifdef delphi}
sysutils,
{$else}
strings,
{$endif}
types,systems,verbose,globals,
symbase,symtype,symsym,symtable,cpuasm
{$ifdef NEWCG}
,cgbase;
{$else}
,hcodegen;
{$endif}
{*************************************************************************
TExprParse
*************************************************************************}
Constructor TExprParse.Init;
Begin
end;
Procedure TExprParse.RPNPush(Num : longint);
{ 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 : longint;
{ 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(Token : String15; prefix:boolean); { RPN Calculator }
Var
Temp : longint;
n1,n2 : longint;
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) : longint;
{ 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):longint;
Var
I : LongInt;
Token : String15;
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 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.Done;
Begin
end;
Function CalculateExpression(const expression: string): longint;
var
expr: TExprParse;
Begin
expr.Init;
CalculateExpression:=expr.Evaluate(expression);
expr.Done;
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 : longint;
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(ValOctal(temp));
end;
'x':
Begin
temp:=s[i+1];
temp:=temp+s[i+2];
inc(i,2);
c:=chr(ValHexaDecimal(temp));
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 ValDecimal(const S:String):longint;
{ Converts a decimal string to longint }
var
vs,c : longint;
Begin
vs:=0;
for c:=1 to length(s) do
begin
vs:=vs*10;
if s[c] in ['0'..'9'] then
inc(vs,ord(s[c])-ord('0'))
else
begin
Message1(asmr_e_error_converting_decimal,s);
ValDecimal:=0;
exit;
end;
end;
ValDecimal:=vs;
end;
Function ValOctal(const S:String):longint;
{ Converts an octal string to longint }
var
vs,c : longint;
Begin
vs:=0;
for c:=1 to length(s) do
begin
vs:=vs shl 3;
if s[c] in ['0'..'7'] then
inc(vs,ord(s[c])-ord('0'))
else
begin
Message1(asmr_e_error_converting_octal,s);
ValOctal:=0;
exit;
end;
end;
ValOctal:=vs;
end;
Function ValBinary(const S:String):longint;
{ Converts a binary string to longint }
var
vs,c : longint;
Begin
vs:=0;
for c:=1 to length(s) do
begin
vs:=vs shl 1;
if s[c] in ['0'..'1'] then
inc(vs,ord(s[c])-ord('0'))
else
begin
Message1(asmr_e_error_converting_binary,s);
ValBinary:=0;
exit;
end;
end;
ValBinary:=vs;
end;
Function ValHexadecimal(const S:String):longint;
{ Converts a binary string to longint }
var
vs,c : longint;
Begin
vs:=0;
for c:=1 to length(s) do
begin
vs:=vs shl 4;
case s[c] of
'0'..'9' :
inc(vs,ord(s[c])-ord('0'));
'A'..'F' :
inc(vs,ord(s[c])-ord('A')+10);
'a'..'f' :
inc(vs,ord(s[c])-ord('a')+10);
else
begin
Message1(asmr_e_error_converting_hexadecimal,s);
ValHexadecimal:=0;
exit;
end;
end;
end;
ValHexadecimal:=vs;
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.init;
begin
size:=S_NO;
hastype:=false;
hasvar:=false;
FillChar(Opr,sizeof(Opr),0);
end;
destructor TOperand.done;
begin
end;
Procedure TOperand.SetCorrectSize(opcode:tasmop);
begin
end;
Procedure TOperand.SetSize(_size:longint;force:boolean);
begin
if force or
((size = S_NO) and (_size<=extended_size)) then
Begin
case _size of
1 : size:=S_B;
2 : size:=S_W{ could be S_IS};
4 : size:=S_L{ could be S_IL or S_FS};
8 : size:=S_IQ{ could be S_D or S_FL};
extended_size : size:=S_FX;
end;
end;
end;
Function TOperand.SetupResult:boolean;
Begin
SetupResult:=false;
{ replace by correct offset. }
if assigned(procinfo^.returntype.def) and
(procinfo^.returntype.def<>pdef(voiddef)) then
begin
if (procinfo^.return_offset=0) and ((m_tp in aktmodeswitches) or
(m_delphi in aktmodeswitches)) then
begin
Message(asmr_e_cannot_use_RESULT_here);
exit;
end;
opr.ref.offset:=procinfo^.return_offset;
opr.ref.base:= procinfo^.framepointer;
opr.ref.options:=ref_parafixup;
{ always assume that the result is valid. }
procinfo^.funcret_state:=vs_assigned;
SetupResult:=true;
end
else
Message(asmr_e_void_function);
end;
Function TOperand.SetupSelf:boolean;
Begin
SetupSelf:=false;
if assigned(procinfo^._class) then
Begin
opr.typ:=OPR_REFERENCE;
opr.ref.offset:=procinfo^.selfpointer_offset;
opr.ref.base:=procinfo^.framepointer;
opr.ref.options:=ref_selffixup;
SetupSelf:=true;
end
else
Message(asmr_e_cannot_use_SELF_outside_a_method);
end;
Function TOperand.SetupOldEBP:boolean;
Begin
SetupOldEBP:=false;
if lexlevel>normal_function_level then
Begin
opr.typ:=OPR_REFERENCE;
opr.ref.offset:=procinfo^.framepointer_offset;
opr.ref.base:=procinfo^.framepointer;
opr.ref.options:=ref_parafixup;
SetupOldEBP:=true;
end
else
Message(asmr_e_cannot_use_OLDEBP_outside_nested_procedure);
end;
Function TOperand.SetupVar(const hs:string;GetOffset : boolean): Boolean;
{ 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 : psym;
harrdef : parraydef;
Begin
SetupVar:=false;
{ are we in a routine ? }
getsym(hs,false);
sym:=srsym;
if sym=nil then
exit;
case sym^.typ of
varsym :
begin
{ we always assume in asm statements that }
{ that the variable is valid. }
pvarsym(sym)^.varstate:=vs_used;
inc(pvarsym(sym)^.refs);
case pvarsym(sym)^.owner^.symtabletype of
objectsymtable :
begin
{ this is not allowed, because we don't know if the self
register is still free, and loading it first is also
not possible, because this could break code }
{ Be TP/Delphi compatible in Delphi or TP modes }
if (m_tp in aktmodeswitches) then
begin
opr.typ:=OPR_CONSTANT;
opr.val:=pvarsym(sym)^.address;
end
{ I do not agree here people using method vars should ensure
that %esi is valid there }
else
begin
opr.ref.base:=self_pointer;
opr.ref.offset:=pvarsym(sym)^.address;
end;
hasvar:=true;
SetupVar:=true;
Exit;
end;
unitsymtable,
globalsymtable,
staticsymtable :
opr.ref.symbol:=newasmsymbol(pvarsym(sym)^.mangledname);
parasymtable :
begin
{ if we only want the offset we don't have to care
the base will be zeroed after ! }
if (lexlevel=pvarsym(sym)^.owner^.symtablelevel) or
{ this below is wrong because there are two parast
for global functions one of interface the second of
implementation
if (pvarsym(sym)^.owner=procinfo^.def^.parast) or }
GetOffset then
begin
opr.ref.base:=procinfo^.framepointer;
end
else
begin
if (procinfo^.framepointer=stack_pointer) and
assigned(procinfo^.parent) and
(lexlevel=pvarsym(sym)^.owner^.symtablelevel+1) and
{ same problem as above !!
(procinfo^.parent^.sym^.definition^.parast=pvarsym(sym)^.owner) and }
(lexlevel>normal_function_level) then
opr.ref.base:=procinfo^.parent^.framepointer
else
message1(asmr_e_local_para_unreachable,hs);
end;
opr.ref.offset:=pvarsym(sym)^.address;
if (lexlevel=pvarsym(sym)^.owner^.symtablelevel) then
begin
opr.ref.offsetfixup:=aktprocsym^.definition^.parast^.address_fixup;
opr.ref.options:=ref_parafixup;
end
else
begin
opr.ref.offsetfixup:=0;
opr.ref.options:=ref_none;
end;
if (pvarsym(sym)^.varspez=vs_var) or
((pvarsym(sym)^.varspez=vs_const) and
push_addr_param(pvarsym(sym)^.vartype.def)) then
SetSize(target_os.size_of_pointer,false);
end;
localsymtable :
begin
if (vo_is_external in pvarsym(sym)^.varoptions) then
opr.ref.symbol:=newasmsymbol(pvarsym(sym)^.mangledname)
else
begin
{ if we only want the offset we don't have to care
the base will be zeroed after ! }
if (lexlevel=pvarsym(sym)^.owner^.symtablelevel) or
{if (pvarsym(sym)^.owner=procinfo^.def^.localst) or}
GetOffset then
opr.ref.base:=procinfo^.framepointer
else
begin
if (procinfo^.framepointer=stack_pointer) and
assigned(procinfo^.parent) and
(lexlevel=pvarsym(sym)^.owner^.symtablelevel+1) and
{(procinfo^.parent^.sym^.definition^.localst=pvarsym(sym)^.owner) and}
(lexlevel>normal_function_level) then
opr.ref.base:=procinfo^.parent^.framepointer
else
message1(asmr_e_local_para_unreachable,hs);
end;
opr.ref.offset:=-(pvarsym(sym)^.address);
if (lexlevel=pvarsym(sym)^.owner^.symtablelevel) then
begin
opr.ref.offsetfixup:=aktprocsym^.definition^.localst^.address_fixup;
opr.ref.options:=ref_localfixup;
end
else
begin
opr.ref.offsetfixup:=0;
opr.ref.options:=ref_none;
end;
end;
if (pvarsym(sym)^.varspez in [vs_var,vs_out]) or
((pvarsym(sym)^.varspez=vs_const) and
push_addr_param(pvarsym(sym)^.vartype.def)) then
SetSize(target_os.size_of_pointer,false);
end;
end;
case pvarsym(sym)^.vartype.def^.deftype of
orddef,
enumdef,
pointerdef,
floatdef :
SetSize(pvarsym(sym)^.getsize,false);
arraydef :
begin
{ for arrays try to get the element size, take care of
multiple indexes }
harrdef:=Parraydef(PVarsym(sym)^.vartype.def);
while assigned(harrdef^.elementtype.def) and
(harrdef^.elementtype.def^.deftype=arraydef) do
harrdef:=parraydef(harrdef^.elementtype.def);
SetSize(harrdef^.elesize,false);
end;
end;
hasvar:=true;
SetupVar:=true;
Exit;
end;
typedconstsym :
begin
opr.ref.symbol:=newasmsymbol(ptypedconstsym(sym)^.mangledname);
case ptypedconstsym(sym)^.typedconsttype.def^.deftype of
orddef,
enumdef,
pointerdef,
floatdef :
SetSize(ptypedconstsym(sym)^.getsize,false);
arraydef :
begin
{ for arrays try to get the element size, take care of
multiple indexes }
harrdef:=Parraydef(PTypedConstSym(sym)^.typedconsttype.def);
while assigned(harrdef^.elementtype.def) and
(harrdef^.elementtype.def^.deftype=arraydef) do
harrdef:=parraydef(harrdef^.elementtype.def);
SetSize(harrdef^.elesize,false);
end;
end;
hasvar:=true;
SetupVar:=true;
Exit;
end;
constsym :
begin
if pconstsym(sym)^.consttyp in [constint,constchar,constbool] then
begin
opr.typ:=OPR_CONSTANT;
opr.val:=pconstsym(sym)^.value;
SetupVar:=true;
Exit;
end;
end;
typesym :
begin
if ptypesym(sym)^.restype.def^.deftype in [recorddef,objectdef] then
begin
opr.typ:=OPR_CONSTANT;
opr.val:=0;
SetupVar:=TRUE;
Exit;
end;
end;
procsym :
begin
if assigned(pprocsym(sym)^.definition^.nextoverloaded) then
Message(asmr_w_calling_overload_func);
opr.typ:=OPR_SYMBOL;
opr.symbol:=newasmsymbol(pprocsym(sym)^.definition^.mangledname);
hasvar:=true;
SetupVar:=TRUE;
Exit;
end;
else
begin
Message(asmr_e_unsupported_symbol_type);
exit;
end;
end;
end;
{ looks for internal names of variables and routines }
Function TOperand.SetupDirectVar(const hs:string): Boolean;
var
p : pasmsymbol;
begin
SetupDirectVar:=false;
p:=getasmsymbol(hs);
if assigned(p) then
begin
opr.ref.symbol:=p;
hasvar:=true;
SetupDirectVar:=true;
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. }
{*********************************************************************}
Begin
case opr.typ of
OPR_REFERENCE:
exit;
OPR_NONE: ;
else
Message(asmr_e_invalid_operand_type);
end;
opr.typ := OPR_REFERENCE;
reset_reference(opr.ref);
end;
procedure TOperand.BuildOperand;
begin
abstract;
end;
{****************************************************************************
TInstruction
****************************************************************************}
constructor TInstruction.init;
Begin
Opcode:=A_NONE;
Opsize:=S_NO;
Condition:=C_NONE;
Ops:=0;
InitOperands;
Labeled:=false;
end;
destructor TInstruction.done;
var
i : longint;
Begin
for i:=1 to 3 do
Dispose(Operands[i],Done);
end;
procedure TInstruction.InitOperands;
var
i : longint;
begin
for i:=1 to 3 do
New(Operands[i],init);
end;
Procedure TInstruction.SwapOperands;
Var
p : POperand;
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;
procedure TInstruction.ConcatInstruction(p:TAAsmOutput);
begin
abstract;
end;
procedure TInstruction.BuildOpcode;
begin
abstract;
end;
{***************************************************************************
TLocalLabel
***************************************************************************}
constructor TLocalLabel.Init(const n:string);
begin
inherited InitName(n);
lab:=nil;
emitted:=false;
end;
function TLocalLabel.Getpasmlabel:pasmlabel;
begin
if not assigned(lab) then
begin
getlabel(lab);
{ this label is forced to be used so it's always written }
inc(lab^.refs);
end;
Getpasmlabel:=lab;
end;
{***************************************************************************
TLocalLabelList
***************************************************************************}
procedure LocalLabelEmitted(p:PNamedIndexObject);
begin
if not PLocalLabel(p)^.emitted then
Message1(asmr_e_unknown_label_identifier,p^.name);
end;
procedure TLocalLabelList.CheckEmitted;
begin
ForEach({$ifdef FPCPROCVAR}@{$endif}LocalLabelEmitted)
end;
function CreateLocalLabel(const s: string; var hl: pasmlabel; emit:boolean):boolean;
var
lab : PLocalLabel;
Begin
CreateLocalLabel:=true;
{ Check if it already is defined }
lab:=PLocalLabel(LocalLabelList^.Search(s));
if not assigned(lab) then
begin
new(lab,init(s));
LocalLabelList^.Insert(lab);
end;
{ 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^.Getpasmlabel;
end;
{****************************************************************************
Symbol table helper routines
****************************************************************************}
Function SearchType(const hs:string): Boolean;
begin
getsym(hs,false);
SearchType:=assigned(srsym) and
(srsym^.typ=typesym);
end;
Function SearchRecordType(const s:string): boolean;
Begin
SearchRecordType:=false;
{ Check the constants in symtable }
getsym(s,false);
if srsym <> nil then
Begin
case srsym^.typ of
typesym :
begin
if ptypesym(srsym)^.restype.def^.deftype in [recorddef,objectdef] then
begin
SearchRecordType:=true;
exit;
end;
end;
end;
end;
end;
Function SearchIConstant(const s:string; var l:longint): 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. }
{**********************************************************************}
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 }
getsym(s,false);
if srsym <> nil then
Begin
case srsym^.typ of
constsym :
begin
if (pconstsym(srsym)^.consttyp in [constord,constint,constchar,constbool]) then
Begin
l:=pconstsym(srsym)^.value;
SearchIConstant:=TRUE;
exit;
end;
end;
enumsym:
Begin
l:=penumsym(srsym)^.value;
SearchIConstant:=TRUE;
exit;
end;
end;
end;
end;
Function GetRecordOffsetSize(s:string;Var Offset: longint;var Size:longint):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 : psymtable;
harrdef : parraydef;
sym : psym;
i : longint;
base : string;
Begin
GetRecordOffsetSize:=FALSE;
Offset:=0;
Size:=0;
i:=pos('.',s);
if i=0 then
i:=255;
base:=Copy(s,1,i-1);
delete(s,1,i);
if base='SELF' then
st:=procinfo^._class^.symtable
else
begin
getsym(base,false);
sym:=srsym;
st:=nil;
{ we can start with a var,type,typedconst }
case sym^.typ of
varsym :
begin
case pvarsym(sym)^.vartype.def^.deftype of
recorddef :
st:=precorddef(pvarsym(sym)^.vartype.def)^.symtable;
objectdef :
st:=pobjectdef(pvarsym(sym)^.vartype.def)^.symtable;
end;
end;
typesym :
begin
case ptypesym(sym)^.restype.def^.deftype of
recorddef :
st:=precorddef(ptypesym(sym)^.restype.def)^.symtable;
objectdef :
st:=pobjectdef(ptypesym(sym)^.restype.def)^.symtable;
end;
end;
typedconstsym :
begin
case ptypedconstsym(sym)^.typedconsttype.def^.deftype of
recorddef :
st:=precorddef(ptypedconstsym(sym)^.typedconsttype.def)^.symtable;
objectdef :
st:=pobjectdef(ptypedconstsym(sym)^.typedconsttype.def)^.symtable;
end;
end;
end;
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(pobjectdef(st^.defowner),base)
else
sym:=psym(st^.search(base));
if not assigned(sym) then
begin
GetRecordOffsetSize:=false;
exit;
end;
st:=nil;
case sym^.typ of
varsym :
begin
inc(Offset,pvarsym(sym)^.address);
Size:=PVarsym(sym)^.getsize;
case pvarsym(sym)^.vartype.def^.deftype of
arraydef :
begin
{ for arrays try to get the element size, take care of
multiple indexes }
harrdef:=Parraydef(PVarsym(sym)^.vartype.def);
while assigned(harrdef^.elementtype.def) and
(harrdef^.elementtype.def^.deftype=arraydef) do
harrdef:=parraydef(harrdef^.elementtype.def);
size:=harrdef^.elesize;
end;
recorddef :
st:=precorddef(pvarsym(sym)^.vartype.def)^.symtable;
objectdef :
st:=pobjectdef(pvarsym(sym)^.vartype.def)^.symtable;
end;
end;
end;
end;
GetRecordOffsetSize:=(s='');
end;
Function SearchLabel(const s: string; var hl: pasmlabel;emit:boolean): boolean;
var
sym : psym;
hs : string;
Begin
hl:=nil;
SearchLabel:=false;
{ Check for pascal labels, which are case insensetive }
hs:=upper(s);
getsym(hs,false);
sym:=srsym;
if sym=nil then
exit;
case sym^.typ of
labelsym :
begin
hl:=plabelsym(sym)^.lab;
if emit then
plabelsym(sym)^.defined:=true
else
plabelsym(sym)^.used:=true;
SearchLabel:=true;
exit;
end;
end;
end;
{*************************************************************************}
{ Instruction Generation Utilities }
{*************************************************************************}
Procedure ConcatString(p : TAAsmoutput;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_length_pchar(strpcopy(pc,s),length(s)));
end;
Procedure ConcatPasString(p : TAAsmoutput;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 ConcatDirect(p : TAAsmoutput;s:string);
{*********************************************************************}
{ PROCEDURE ConcatDirect(s:string) }
{ Description: This routine output the string directly to the asm }
{ output, it is only sed when writing special labels in AT&T mode, }
{ and should not be used without due consideration, since it may }
{ cause problems. }
{*********************************************************************}
Var
pc: PChar;
Begin
getmem(pc,length(s)+1);
p.concat(Tai_direct.Create(strpcopy(pc,s)));
end;
Procedure ConcatConstant(p: TAAsmoutput; value: longint; maxvalue: longint);
{*********************************************************************}
{ PROCEDURE ConcatConstant(value: longint; maxvalue: longint); }
{ 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. }
{ $ffffffff -> create a dword node. }
{*********************************************************************}
Begin
if (maxvalue <> longint($ffffffff)) and (value > maxvalue) then
Begin
Message(asmr_e_constant_out_of_bounds);
{ assuming a value of maxvalue }
value:=maxvalue;
end;
if maxvalue = $ff then
p.concat(Tai_const.Create_8bit(byte(value)))
else
if maxvalue = $ffff then
p.concat(Tai_const.Create_16bit(word(value)))
else
if maxvalue = longint($ffffffff) then
p.concat(Tai_const.Create_32bit(longint(value)));
end;
Procedure ConcatConstSymbol(p : TAAsmoutput;const sym:string;l:longint);
begin
p.concat(Tai_const_symbol.Createname_offset(sym,l));
end;
Procedure ConcatRealConstant(p : TAAsmoutput;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 : p.concat(Tai_real_64bit.Create(value));
s80real : p.concat(Tai_real_80bit.Create(value));
s64comp : p.concat(Tai_comp_64bit.Create(value));
f32bit : p.concat(Tai_const.Create_32bit(trunc(value*$10000)));
end;
end;
Procedure ConcatLabel(p: TAAsmoutput;var l : pasmlabel);
{*********************************************************************}
{ 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:TAAsmoutput;l:longint);
{*********************************************************************}
{ 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:TAAsmoutput;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,0));
end;
procedure ConcatLocal(p:TAAsmoutput;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,0));
end;
Procedure ConcatGlobalBss(const s : string;size : longint);
{*********************************************************************}
{ PROCEDURE ConcatGlobalBss }
{ Description: This routine emits an global datablock to the }
{ linked list of instructions. }
{*********************************************************************}
begin
bssSegment.concat(Tai_datablock.Create_global(s,size));
end;
Procedure ConcatLocalBss(const s : string;size : longint);
{*********************************************************************}
{ PROCEDURE ConcatLocalBss }
{ Description: This routine emits a local datablcok to the }
{ linked list of instructions. }
{*********************************************************************}
begin
bssSegment.concat(Tai_datablock.Create(s,size));
end;
end.
{
$Log$
Revision 1.15 2001-02-26 19:44:54 peter
* merged generic m68k updates from fixes branch
Revision 1.14 2000/12/25 00:07:28 peter
+ new tlinkedlist class (merge of old tstringqueue,tcontainer and
tlinkedlist objects)
Revision 1.13 2000/12/07 17:19:43 jonas
* new constant handling: from now on, hex constants >$7fffffff are
parsed as unsigned constants (otherwise, $80000000 got sign extended
and became $ffffffff80000000), all constants in the longint range
become longints, all constants >$7fffffff and <=cardinal($ffffffff)
are cardinals and the rest are int64's.
* added lots of longint typecast to prevent range check errors in the
compiler and rtl
* type casts of symbolic ordinal constants are now preserved
* fixed bug where the original resulttype wasn't restored correctly
after doing a 64bit rangecheck
Revision 1.12 2000/11/29 00:30:38 florian
* unused units removed from uses clause
* some changes for widestrings
Revision 1.11 2000/11/06 22:30:30 peter
* more fixes
Revision 1.10 2000/11/04 14:25:21 florian
+ merged Attila's changes for interfaces, not tested yet
Revision 1.9 2000/10/31 22:30:13 peter
* merged asm result patch part 2
Revision 1.8 2000/10/31 22:02:51 peter
* symtable splitted, no real code changes
Revision 1.7 2000/10/08 10:26:33 peter
* merged @result fix from Pierre
Revision 1.6 2000/09/24 21:19:51 peter
* delphi compile fixes
Revision 1.5 2000/09/24 15:06:26 peter
* use defines.inc
Revision 1.4 2000/08/27 16:11:52 peter
* moved some util functions from globals,cobjects to cutils
* splitted files into finput,fmodule
Revision 1.3 2000/08/06 10:42:29 peter
* merged patches name generation in lib and asm constant eval
Revision 1.2 2000/07/13 11:32:48 michael
+ removed logs
}
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