fpc/rtl/objpas/typinfo.pp
1998-12-15 22:42:49 +00:00

828 lines
24 KiB
ObjectPascal

{
$Id$
This file is part of the Free Pascal run time library.
Copyright (c) 1998 by Florian Klaempfl
member of the Free Pascal development team
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
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.
**********************************************************************}
{ This unit provides the same functionality as the TypInfo Unit }
{ of Delphi }
unit typinfo;
interface
{$MODE objfpc}
// temporary types:
type
PShortString =^ShortString;
PByte =^Byte;
PLongint =^Longint;
PBoolean =^Boolean;
PSingle =^Single;
PDouble =^Double;
PExtended =^Extended;
PComp =^Comp;
PFixed16 =^Fixed16;
{ Doesn't exist ?
PFIxed32 = ^Fixed32;
}
Variant = Pointer;
TMethod = Pointer;
{$MINENUMSIZE 1 this saves a lot of memory }
// if you change one of the following enumeration types
// you have also to change the compiler in an appropriate way !
TTypeKind = (tkUnknown,tkInteger,tkChar,tkEnumeration,
tkFloat,tkSet,tkMethod,tkSString,tkLString,tkAString,
tkWString,tkVariant,tkArray,tkRecord,tkInterface,
tkClass,tkObject,tkWChar,tkBool);
TTOrdType = (otSByte,otUByte,otSWord,otUWord,otSLong,otULong);
TFloatType = (ftSingle,ftDouble,ftExtended,ftComp,ftCurr,
ftFixed16,ftFixed32);
TMethodKind = (mkProcedure,mkFunction,mkSafeProcedure,mkSafeFunction);
TParamFlags = set of (pfVar,pfConst,pfArray,pfAddress,pfReference,pfOut);
TIntfFlags = set of (ifHasGuid,ifDispInterface,ifDispatch);
{$MINENUMSIZE DEFAULT}
const
ptField = 0;
ptStatic = 1;
ptVirtual = 2;
ptConst = 3;
tkString = tkSString;
type
TTypeKinds = set of TTypeKind;
{$PACKRECORDS 1}
TTypeInfo = record
Kind : TTypeKind;
Name : ShortString;
// here the type data follows as TTypeData record
end;
PTypeInfo = ^TTypeInfo;
PPTypeInfo = ^PTypeInfo;
PTypeData = ^TTypeData;
TTypeData = packed record
case TTypeKind of
tkUnKnown,tkLString,tkWString,tkAString,tkVariant:
();
tkInteger,tkChar,tkEnumeration,tkWChar:
(OrdType : TTOrdType;
case TTypeKind of
tkInteger,tkChar,tkEnumeration,tkBool,tkWChar : (
MinValue,MaxValue : Longint;
case TTypeKind of
tkEnumeration:
(
BaseType : PTypeInfo;
NameList : ShortString)
);
tkSet:
(CompType : PTypeInfo)
);
tkFloat:
(FloatType : TFloatType);
tkSString:
(MaxLength : Byte);
tkClass:
(ClassType : TClass;
ParentInfo : PTypeInfo;
PropCount : SmallInt;
UnitName : ShortString
// here the properties follow as array of TPropInfo
);
tkMethod:
({!!!!!!!}
);
tkInterface:
({!!!!!!!}
);
end;
// unsed, just for completeness
TPropData = packed record
PropCount : Word;
PropList : record end;
end;
PPropInfo = ^TPropInfo;
TPropInfo = packed record
PropType : PTypeInfo;
GetProc : Pointer;
SetProc : Pointer;
StoredProc : Pointer;
Index : Integer;
Default : Longint;
NameIndex : SmallInt;
// contains the type of the Get/Set/Storedproc, see also ptxxx
// bit 0..1 GetProc
// 2..3 SetProc
// 4..5 StoredProc
// 6 : true, constant index property
PropProcs : Byte;
Name : ShortString;
end;
TProcInfoProc = procedure(PropInfo : PPropInfo) of object;
PPropList = ^TPropList;
TPropList = array[0..65535] of PPropInfo;
const
tkAny = [Low(TTypeKind)..High(TTypeKind)];
tkMethods = [tkMethod];
tkProperties = tkAny-tkMethods-[tkUnknown];
{ general property handling }
// just skips the id and the name
function GetTypeData(TypeInfo : PTypeInfo) : PTypeData;
// searches in the property PropName
function GetPropInfo(TypeInfo : PTypeInfo;const PropName : string) : PPropInfo;
procedure GetPropInfos(TypeInfo : PTypeInfo;PropList : PPropList);
function GetPropList(TypeInfo : PTypeInfo;TypeKinds : TTypeKinds;
PropList : PPropList) : Integer;
// returns true, if PropInfo is a stored property
function IsStoredProp(Instance : TObject;PropInfo : PPropInfo) : Boolean;
{ subroutines to read/write properties }
function GetOrdProp(Instance : TObject;PropInfo : PPropInfo) : Longint;
procedure SetOrdProp(Instance : TObject;PropInfo : PPropInfo;
Value : Longint);
function GetStrProp(Instance : TObject;PropInfo : PPropInfo) : Ansistring;
procedure SetStrProp(Instance : TObject;PropInfo : PPropInfo;
const Value : Ansistring);
function GetFloatProp(Instance : TObject;PropInfo : PPropInfo) : Extended;
procedure SetFloatProp(Instance : TObject;PropInfo : PPropInfo;
Value : Extended);
function GetVariantProp(Instance : TObject;PropInfo : PPropInfo): Variant;
procedure SetVariantProp(Instance : TObject;PropInfo : PPropInfo;
const Value: Variant);
function GetMethodProp(Instance : TObject;PropInfo : PPropInfo) : TMethod;
procedure SetMethodProp(Instance : TObject;PropInfo : PPropInfo;
const Value : TMethod);
{ misc. stuff }
function GetEnumName(TypeInfo : PTypeInfo;Value : Integer) : string;
function GetEnumValue(TypeInfo : PTypeInfo;const Name : string) : Integer;
implementation
{$ASMMODE ATT}
function CallIntegerFunc(s : Pointer;Address : Pointer; INdex,IValue : Longint) : Integer;assembler;
Label LINoPush;
asm
movl S,%esi
movl Address,%edi
// ? Indexed function
movl Index,%eax
xorl %eax,%eax
jnz LINoPush
movl IValue,%eax
pushl %eax
LINoPush:
call (%edi)
// now the result should be in EAX, untested yet (FK)
end;
function CallIntegerProc(s : Pointer;Address : Pointer;Value : Integer; INdex,IVAlue : Longint) : Integer;assembler;
label LIPNoPush;
asm
movl S,%esi
movl Address,%edi
// Push value to set
movl Value,%eax
pushl %eax
// ? Indexed procedure
movl Index,%eax
xorl %eax,%eax
jnz LIPNoPush
movl IValue,%eax
pushl %eax
LIPNoPush:
call (%edi)
// now the result should be in EAX, untested yet (FK)
end;
function CallExtendedFunc(s : Pointer;Address : Pointer; INdex,IValue : Longint) : Extended;assembler;
Label LINoPush;
asm
movl S,%esi
movl Address,%edi
// ? Indexed function
movl Index,%eax
xorl %eax,%eax
jnz LINoPush
movl IValue,%eax
pushl %eax
LINoPush:
call (%edi)
//!! now What ??
end;
function CallExtendedProc(s : Pointer;Address : Pointer;Value : Extended; INdex,IVAlue : Longint) : Integer;assembler;
label LIPNoPush;
asm
movl S,%esi
movl Address,%edi
// Push value to set
//!! MUST BE CHANGED !!
movl Value,%eax
pushl %eax
// ? Indexed procedure
movl Index,%eax
xorl %eax,%eax
jnz LIPNoPush
movl IValue,%eax
pushl %eax
LIPNoPush:
call (%edi)
end;
function CallBooleanFunc(s : Pointer;Address : Pointer; Index,IValue : Longint) : Boolean;assembler;
Label LBNoPush;
asm
movl S,%edi
movl Address,%edi
// ? Indexed function
movl Index,%eax
xorl %eax,%eax
jnz LBNoPush
movl IValue,%eax
pushl %eax
LBNoPush:
call (%edi)
// now the result should be in EAX, untested yet (FK)
end;
//!! Assembler functions can't have short stringreturn values.
//!! So we make a procedure with var parameter.
Procedure CallSStringFunc(s : Pointer;Address : Pointer; INdex,IValue : Longint;
Var Res: Shortstring);assembler;
Label LSSNoPush;
asm
movl S,%esi
movl Address,%edi
// ? Indexed function
movl Index,%eax
xorl %eax,%eax
jnz LSSNoPush
movl IValue,%eax
pushl %eax
LSSNoPush:
call (%edi)
//!! now what ?? MVC
end;
function CallSStringProc(s : Pointer;Address : Pointer;Value : ShortString; INdex,IVAlue : Longint);assembler;
label LSSPNoPush;
asm
movl S,%esi
movl Address,%edi
// Push value to set
//!! Is this correct for short strings ????
movl Value,%eax
pushl %eax
// ? Indexed procedure
movl Index,%eax
xorl %eax,%eax
jnz LSSPNoPush
movl IValue,%eax
pushl %eax
LSSPNoPush:
call (%edi)
//!! now what ? MVC
end;
function GetTypeData(TypeInfo : PTypeInfo) : PTypeData;
begin
GetTypeData:=PTypeData(TypeInfo)+2+PByte(TypeInfo+1)^;
end;
function GetPropInfo(TypeInfo : PTypeInfo;const PropName : string) : PPropInfo;
var
hp : PTypeData;
i : longint;
begin
Result:=Nil;
while Assigned(TypeInfo) do
begin
// skip the name
hp:=GetTypeData(Typeinfo);
// the class info rtti the property rtti follows
// immediatly
Result:=PPropInfo(@hp^.UnitName)+byte(hp^.UnitName[0])+1;
for i:=1 to hp^.PropCount do
begin
// found a property of that name ?
if Result^.Name=PropName then
exit;
// skip to next property
Result:=PPropInfo(@Result^.Name)+byte(Result^.Name[0])+1;
end;
// parent class
Typeinfo:=hp^.ParentInfo;
end;
end;
function IsStoredProp(Instance : TObject;PropInfo : PPropInfo) : Boolean;
begin
case (PropInfo^.PropProcs shr 4) and 3 of
ptfield:
IsStoredProp:=PBoolean(Pointer(Instance)+Longint(PropInfo^.StoredProc))^;
ptstatic:
IsStoredProp:=CallBooleanFunc(Instance,PropInfo^.StoredProc,0,0);
ptvirtual:
IsStoredProp:=CallBooleanFunc(Instance,(PPointer(Instance.ClassType)+Longint(PropInfo^.StoredProc)),0,0);
ptconst:
IsStoredProp:=LongBool(PropInfo^.StoredProc);
end;
end;
procedure GetPropInfos(TypeInfo : PTypeInfo;PropList : PPropList);
{
Store Pointers to property information in the list pointed
to by proplist. PRopList must contain enough space to hold ALL
properties.
}
Type PWord = ^Word;
Var TD : PTypeData;
TP : PPropInfo;
Count : Longint;
begin
TD:=GetTypeData(TypeInfo);
// Get this objects TOTAL published properties count
TP:=(@TD^.UnitName+Length(TD^.UnitName)+1);
Count:=PWord(TP)^;
// Now point TP to first propinfo record.
Inc(Longint(TP),SizeOF(Word));
While Count>0 do
begin
PropList^[0]:=TP;
Inc(Longint(PropList),SizeOf(Pointer));
// Point to TP next propinfo record.
// Located at Name[Length(Name)+1] !
TP:=PPropInfo((@TP^.Name)+PByte(@TP^.Name)^+1);
Dec(Count);
end;
// recursive call for parent info.
If TD^.Parentinfo<>Nil then
GetPropInfos (TD^.ParentInfo,PropList);
end;
Procedure InsertProp (PL : PProplist;PI : PPropInfo; Count : longint);
VAr I : Longint;
begin
I:=0;
While (I<Count) and (PI^.Name>PL^[I]^.Name) do Inc(I);
If I<Count then
Move(PL^[I],PL[I+1],Count-I*SizeOf(Pointer));
PL^[I]:=PI;
end;
function GetPropList(TypeInfo : PTypeInfo;TypeKinds : TTypeKinds;
PropList : PPropList) : Integer;
{
Store Pointers to property information OF A CERTAIN KIND in the list pointed
to by proplist. PRopList must contain enough space to hold ALL
properties.
}
Var TempList : PPropList;
PropInfo : PPropinfo;
I,Count : longint;
begin
Result:=0;
Count:=GetTypeData(TypeInfo)^.Propcount;
If Count>0 then
begin
GetMem(TempList,Count*SizeOf(Pointer));
Try
GetPropInfos(TypeInfo,TempList);
For I:=0 to Count-1 do
begin
PropInfo:=TempList^[i];
If PropInfo^.PropType^.Kind in TypeKinds then
begin
InsertProp(PropList,PropInfo,Result);
Inc(Result);
end;
end;
finally
FreeMem(TempList,Count*SizeOf(Pointer));
end;
end;
end;
Procedure SetIndexValues (P: PPRopInfo; Var Index,IValue : Longint);
begin
Index:=((P^.PropProcs shr 6) and 1);
If Index=0 then
IValue:=P^.Index
else
IValue:=0;
end;
function GetOrdProp(Instance : TObject;PropInfo : PPropInfo) : Longint;
var
value,Index,Ivalue : longint;
begin
SetIndexValues(PropInfo,Index,Ivalue);
case (PropInfo^.PropProcs) and 3 of
ptfield:
Value:=PLongint(Pointer(Instance)+Longint(PropInfo^.GetProc))^;
ptstatic:
Value:=CallIntegerFunc(Instance,PropInfo^.GetProc,Index,IValue);
ptvirtual:
Value:=CallIntegerFunc(Instance,
(PPointer(Instance.ClassType)+Longint(PropInfo^.GetProc)),
Index,IValue);
end;
{ cut off unnecessary stuff }
case GetTypeData(PropInfo^.PropType)^.OrdType of
otSWord,otUWord:
Value:=Value and $ffff;
otSByte,otUByte:
Value:=Value and $ff;
end;
GetOrdProp:=Value;
end;
procedure SetOrdProp(Instance : TObject;PropInfo : PPropInfo;
Value : Longint);
Var Index,IValue : Longint;
begin
{ cut off unnecessary stuff }
case GetTypeData(PropInfo^.PropType)^.OrdType of
otSWord,otUWord:
Value:=Value and $ffff;
otSByte,otUByte:
Value:=Value and $ff;
end;
SetIndexValues(PropInfo,Index,Ivalue);
case (PropInfo^.PropProcs) and 3 of
ptfield:
PLongint(Pointer(Instance)+Longint(PropInfo^.SetProc))^:=Value;
ptstatic:
CallIntegerProc(Instance,PropInfo^.SetProc,Value,Index,IValue);
ptvirtual:
CallIntegerProc(Instance,
(PPointer(Instance.ClassType)+Longint(PropInfo^.SetProc)),
Value,Index,IValue);
end;
end;
Function GetAStrProp(Instance : TObject;PropInfo : PPropInfo):Pointer;
{
Dirty trick based on fact that AnsiString is just a pointer,
hence can be treated like an integer type.
}
var
value : Pointer;
Index,Ivalue : Longint;
begin
SetIndexValues(PropInfo,Index,IValue);
case (PropInfo^.PropProcs) and 3 of
ptfield:
Value:=Pointer(PLongint(Pointer(Instance)+Longint(PropInfo^.GetProc))^);
ptstatic:
Value:=Pointer(CallIntegerFunc(Instance,PropInfo^.GetProc,Index,IValue));
ptvirtual:
Value:=Pointer(CallIntegerFunc(Instance,
(PPointer(Instance.ClassType)+Longint(PropInfo^.GetProc)),
Index,IValue));
end;
GetAstrProp:=Value;
end;
Function GetSStrProp(Instance : TObject;PropInfo : PPropInfo):ShortString;
var
value : ShortString;
Index,IValue : Longint;
begin
SetIndexValues(PropInfo,Index,IValue);
case (PropInfo^.PropProcs) and 3 of
ptfield:
Value:=PShortString(Pointer(Instance)+Longint(PropInfo^.GetProc))^;
ptstatic:
CallSStringFunc(Instance,PropInfo^.GetProc,Index,IValue,Value);
ptvirtual:
CallSSTringFunc(Instance,
(PPointer(Instance.ClassType)+Longint(PropInfo^.GetProc)),
Index,Ivalue,Value);
end;
GetSStrProp:=Value;
end;
function GetStrProp(Instance : TObject;PropInfo : PPropInfo) : Ansistring;
begin
Case Propinfo^.PropType^.Kind of
tkSString : Result:=GetSStrProp(Instance,PropInfo);
tkAString : Pointer(Result):=GetAStrProp(Instance,Propinfo);
else
Result:='';
end;
end;
procedure SetAStrProp(Instance : TObject;PropInfo : PPropInfo;
const Value : AnsiString);
{
Dirty trick based on fact that AnsiString is just a pointer,
hence can be treated like an integer type.
}
var
Index,Ivalue : Longint;
begin
SetIndexValues(PropInfo,Index,IValue);
case (PropInfo^.PropProcs) and 3 of
ptfield:
PLongint(Pointer(Instance)+Longint(PropInfo^.SetProc))^:=Longint(Pointer(Value)) ;
ptstatic:
CallIntegerProc(Instance,PropInfo^.SetProc,Longint(Pointer(Value)),Index,IValue);
ptvirtual:
CallIntegerProc(Instance,
(PPointer(Instance.ClassType)+Longint(PropInfo^.SetProc)),
Longint(Pointer(Value)),Index,IValue);
end;
end;
procedure SetSStrProp(Instance : TObject;PropInfo : PPropInfo;
const Value : ShortString);
Var Index,IValue: longint;
begin
SetIndexValues(PRopInfo,Index,IValue);
case (PropInfo^.PropProcs) and 3 of
ptfield:
PShortString(Pointer(Instance)+Longint(PropInfo^.SetProc))^:=Value;
ptstatic:
CallSStringProc(Instance,PropInfo^.GetProc,Value,Index,IValue);
ptvirtual:
CallSStringProc(Instance,
(PPointer(Instance.ClassType)+Longint(PropInfo^.GetProc)),
Value,Index,IValue);
end;
end;
procedure SetStrProp(Instance : TObject;PropInfo : PPropInfo;
const Value : AnsiString);
begin
Case Propinfo^.PropType^.Kind of
tkSString : SetSStrProp(Instance,PropInfo,Value);
tkAString : SetAStrProp(Instance,Propinfo,Value);
end;
end;
function GetFloatProp(Instance : TObject;PropInfo : PPropInfo) : Extended;
var
Index,Ivalue : longint;
Value : Extended;
begin
SetIndexValues(PropInfo,Index,Ivalue);
case (PropInfo^.PropProcs) and 3 of
ptfield:
Case GetTypeData(PropInfo^.PropType)^.FloatType of
ftSingle:
Value:=PSingle(Pointer(Instance)+Longint(PropInfo^.GetProc))^;
ftDouble:
Value:=PDouble(Pointer(Instance)+Longint(PropInfo^.GetProc))^;
ftExtended:
Value:=PExtended(Pointer(Instance)+Longint(PropInfo^.GetProc))^;
ftcomp:
Value:=PComp(Pointer(Instance)+Longint(PropInfo^.GetProc))^;
{ Uncommenting this code results in a internal error!!
ftFixed16:
Value:=PFixed16(Pointer(Instance)+Longint(PropInfo^.GetProc))^;
ftfixed32:
Value:=PFixed32(Pointer(Instance)+Longint(PropInfo^.GetProc))^;
}
end;
ptstatic:
Value:=CallExtendedFunc(Instance,PropInfo^.GetProc,Index,IValue);
ptvirtual:
Value:=CallExtendedFunc(Instance,
(PPointer(Instance.ClassType)+Longint(PropInfo^.GetProc)),
Index,IValue);
end;
end;
procedure SetFloatProp(Instance : TObject;PropInfo : PPropInfo;
Value : Extended);
Var IValue,Index : longint;
begin
SetIndexValues(PropInfo,Index,Ivalue);
case (PropInfo^.PropProcs) and 3 of
ptfield:
Case GetTypeData(PropInfo^.PropType)^.FloatType of
ftSingle:
PSingle(Pointer(Instance)+Longint(PropInfo^.SetProc))^:=Value;
ftDouble:
PDouble(Pointer(Instance)+Longint(PropInfo^.SetProc))^:=Value;
ftExtended:
PExtended(Pointer(Instance)+Longint(PropInfo^.SetProc))^:=Value;
ftcomp:
PComp(Pointer(Instance)+Longint(PropInfo^.SetProc))^:=Value;
{ Uncommenting this code results in a internal error!!
ftFixed16:
PFixed16(Pointer(Instance)+Longint(PropInfo^.SetProc))^:=Value;
ftfixed32:
PFixed32(Pointer(Instance)+Longint(PropInfo^.SetProc))^:=Value;
}
end;
ptstatic:
CallExtendedProc(Instance,PropInfo^.SetProc,Value,Index,IValue);
ptvirtual:
CallExtendedProc(Instance,
(PPointer(Instance.ClassType)+Longint(PropInfo^.GetProc)),
Value,Index,IValue);
end;
end;
function GetVariantProp(Instance : TObject;PropInfo : PPropInfo): Variant;
begin
{!!!!!!!!!!!}
end;
procedure SetVariantProp(Instance : TObject;PropInfo : PPropInfo;
const Value: Variant);
begin
{!!!!!!!!!!!}
end;
function GetMethodProp(Instance : TObject;PropInfo : PPropInfo) : TMethod;
begin
{!!!!!!!!!!!!}
end;
procedure SetMethodProp(Instance : TObject;PropInfo : PPropInfo;
const Value : TMethod);
begin
{!!!!!!!!!!!}
end;
function GetEnumName(TypeInfo : PTypeInfo;Value : Integer) : string;
Var PS : PShortString;
PT : PTypeData;
begin
PT:=GetTypeData(GetTypeData(TypeInfo)^.BaseType);
If PT^.MinValue<0 then Value:=Ord(Value<>0); {map to 0/1}
PS:=@PT^.NameList;
While Value>0 Do
begin
PS:=PS+PByte(PS)^+1;
Dec(Value);
end;
Result:=PS^;
end;
function GetEnumValue(TypeInfo : PTypeInfo;const Name : string) : Integer;
Var PS : PShortString;
PT : PTypeData;
Count : longint;
begin
If Length(Name)=0 then exit(-1);
PT:=GetTypeData(GetTypeData(TypeInfo)^.BaseType);
Count:=0;
Result:=-1;
PS:=@PT^.NameList;
While (Result=-1) and (PByte(PS)^<>0) do
begin
If PS^=Name then
Result:=Count;
PS:=PS+PByte(PS)^;
Inc(Count);
end;
end;
end.
{
$Log$
Revision 1.17 1998-12-15 22:43:13 peter
* removed temp symbols
Revision 1.16 1998/12/02 12:35:07 michael
More changes for type-information
Revision 1.15 1998/11/26 14:57:47 michael
+ Added packrecords 1
Revision 1.11 1998/09/24 23:45:28 peter
* updated for auto objpas loading
Revision 1.10 1998/09/20 08:25:34 florian
+ description of tpropinfo.propprocs bit 6 added
Revision 1.9 1998/09/19 15:25:45 florian
* procedure GetOrdProp added
Revision 1.8 1998/09/19 08:33:53 florian
+ some procedures added
Revision 1.7 1998/09/08 09:52:31 florian
* small problems fixed
Revision 1.6 1998/09/08 00:08:36 michael
Made it compilable
Revision 1.5 1998/09/07 23:11:43 florian
+ more fields to TTypeInfo added
Revision 1.4 1998/09/07 19:34:47 florian
* constant value is now supported as stored condition
Revision 1.3 1998/09/07 08:32:59 florian
+ procedure IsStoredProc added
Revision 1.2 1998/09/06 21:27:05 florian
+ some methods and declarations added
Revision 1.1 1998/08/25 22:30:00 florian
+ initial revision:
o constants
o basic type data record
}