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program DumpClass;
{$mode objfpc}{$H+}
uses
Classes, SysUtils;
const
VMT_COUNT = 100;
type
TMethodNameTableEntry = packed record
Name: PShortstring;
Addr: Pointer;
end;
TMethodNameTable = packed record
Count: DWord;
Entries: packed array[0..9999999] of TMethodNameTableEntry;
end;
PMethodNameTable = ^TMethodNameTable;
TPointerArray = packed array[0..9999999] of Pointer;
PPointerArray = ^TPointerArray;
PFieldInfo = ^TFieldInfo;
TFieldInfo = packed record
FieldOffset: LongWord;
ClassTypeIndex: Word;
Name: ShortString;
end;
PFieldClassTable = ^TFieldClassTable;
TFieldClassTable =
{$ifndef FPC_REQUIRES_PROPER_ALIGNMENT}
packed
{$endif FPC_REQUIRES_PROPER_ALIGNMENT}
record
Count: Word;
Entries: array[Word] of TPersistentClass;
end;
PFieldTable = ^TFieldTable;
TFieldTable =
{$ifndef FPC_REQUIRES_PROPER_ALIGNMENT}
packed
{$endif FPC_REQUIRES_PROPER_ALIGNMENT}
record
FieldCount: Word;
ClassTable: PFieldClassTable;
{ Fields: array[Word] of TFieldInfo; Elements have variant size! }
end;
{$M+}
TMyTest = class(TObject)
published
F1: TMyTest;
F2: TMyTest;
procedure P1; virtual;
procedure P2; virtual;
end;
{$M-}
TMyTest2 = class(TMyTest)
F3: TMyTest;
F4: TMyTest;
procedure P2; override;
procedure P3; virtual;
end;
TMyPersistent = class(TPersistent)
procedure P1; virtual;
procedure P2; virtual;
end;
procedure TMyTest.P1;
begin
end;
procedure TMyTest.P2;
begin
end;
procedure TMyTest2.P2;
begin
end;
procedure TMyTest2.P3;
begin
end;
procedure TMyPersistent.P1;
begin
end;
procedure TMyPersistent.P2;
begin
end;
procedure ClassDump(AClass: TClass);
var
Cvmt: PPointerArray;
Cmnt: PMethodNameTable;
Cft: PFieldTable;
FieldOffset: LongWord;
fi: PFieldInfo;
Indent: String;
n, idx: Integer;
SearchAddr: Pointer;
begin
WriteLn('---------------------------------------------');
WriteLn('Dump of ', AClass.ClassName);
WriteLn('---------------------------------------------');
Indent := '';
while AClass <> nil do
begin
WriteLn(Indent, 'Processing ', AClass.Classname);
Indent := Indent + ' ';
//---
Cmnt := PPointer(Pointer(AClass) + vmtMethodTable)^;
if Cmnt <> nil
then begin
WriteLn(Indent, 'Method count: ', IntToStr(Cmnt^.Count));
Cvmt := Pointer(AClass) + vmtMethodStart;
for n := 0 to Cmnt^.Count - 1 do
begin
Write(Indent, 'Search: ', Cmnt^.Entries[n].Name^);
SearchAddr := Cmnt^.Entries[n].Addr;
for idx := 0 to VMT_COUNT - 1 do
begin
if Cvmt^[idx] = SearchAddr
then begin
WriteLn(Indent, ' Found at index: ', IntToStr(idx));
Break;
end;
if idx = VMT_COUNT - 1
then begin
WriteLn('[WARNING] VMT entry "', Cmnt^.Entries[n].Name^, '" not found in "', AClass.ClassName, '"');
Break;
end;
end;
end;
end;
//---
Cft := PPointer(Pointer(AClass) + vmtFieldTable)^;
if Cft <> nil
then begin
WriteLn(Indent, 'Field count: ', Cft^.FieldCount);
fi := @Cft^.ClassTable + SizeOf(Cft^.ClassTable);
for n := 0 to Cft^.FieldCount - 1 do
begin
{$ifdef FPC_REQUIRES_PROPER_ALIGNMENT}
pointer(fi):=align(fi,sizeof(pointer));
{$endif FPC_REQUIRES_PROPER_ALIGNMENT}
Move(fi^.FieldOffset, FieldOffset, SizeOf(FieldOffset));
WriteLn(Indent, ' ', n, ': ', fi^.Name, ' @', FieldOffset);
fi := @fi^.name + 1 + Ord(fi^.name[0]);
end;
WriteLn(Indent, 'Field class count: ', Cft^.ClassTable^.Count);
for n := 0 to Cft^.ClassTable^.Count - 1 do
begin
WriteLn(Indent, ' ', n, ': ', Cft^.ClassTable^.Entries[n].ClassName);
end;
end;
AClass := AClass.ClassParent;
end;
end;
begin
ClassDump(TMyTest);
ClassDump(TMyTest2);
ClassDump(TPersistent);
ClassDump(TMyPersistent);
end.
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