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{
This file is part of the Free Component Library (FCL)
Copyright (c) 1998 by Michael Van Canneyt and Florian Klaempfl
Classes unit for win32
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.
**********************************************************************}
{$mode objfpc}
{ determine the type of the resource/form file }
{$define Win16Res}
unit Classes;
interface
uses
rtlconsts,
sysutils,
types,
sortbase,
{$ifdef FPC_TESTGENERICS}
fgl,
{$endif}
typinfo,
windows;
type
TWndMethod = procedure(var msg : TMessage) of object;
function MakeObjectInstance(Method: TWndMethod): Pointer;
procedure FreeObjectInstance(ObjectInstance: Pointer);
function AllocateHWnd(Method: TWndMethod): HWND;
procedure DeallocateHWnd(Wnd: HWND);
{$i classesh.inc}
implementation
uses
sysconst;
{ OS - independent class implementations are in /inc directory. }
{$i classes.inc}
type
PMethodWrapperTrampoline = ^TMethodWrapperTrampoline;
PWrapperBlock = ^TWrapperBlock;
TMethodWrapperTrampoline = packed record
Call : byte;
CallOffset : PtrInt;
Jmp : byte;
JmpOffset : PtrInt;
case Integer of
0: (Next: PMethodWrapperTrampoline; Block : PWrapperBlock);
1: (Method: TWndMethod);
end;
TWrapperBlock = packed record
Next : PWrapperBlock;
UsageCount : Longint;
Trampolines : array[0..0] of TMethodWrapperTrampoline;
end;
var
WrapperBlockList : PWrapperBlock;
TrampolineFreeList : PMethodWrapperTrampoline;
CritObjectInstance : TCriticalSection;
function TrampolineWndProc(Window: HWND; Message, WParam: WPARAM;LParam: LPARAM): HRESULT; stdcall; assembler;
asm
// build up tmessage structure
pushl $0
movl (%eax),%ecx
pushl LPARAM
pushl WPARAM
pushl Message
// msg
leal (%esp),%edx
// load self
movl 4(%eax),%eax
// call method
call %ecx
addl $12,%esp
// load result
popl %eax
end;
function get_method_offset : Pointer;assembler;nostackframe;
asm
movl (%esp),%eax
addl $5,%eax
end;
const
SizeOfPage = 4096;
function MakeObjectInstance(Method: TWndMethod): Pointer;
var
NewBlock : PWrapperBlock;
Trampoline : PMethodWrapperTrampoline;
begin
EnterCriticalSection(CritObjectInstance);
try
if not(assigned(TrampolineFreeList)) then
begin
NewBlock:=VirtualAlloc(nil,SizeOfPage,MEM_COMMIT,PAGE_EXECUTE_READWRITE);
NewBlock^.UsageCount:=0;
NewBlock^.Next:=WrapperBlockList;
WrapperBlockList:=NewBlock;
Trampoline:=@NewBlock^.Trampolines;
while pointer(Trampoline)+sizeof(Trampoline)<pointer(NewBlock)+SizeOfPage do
begin
Trampoline^.Next:=TrampolineFreeList;
Trampoline^.Block:=NewBlock;
TrampolineFreeList:=Trampoline;
inc(Trampoline);
end;
end;
Trampoline:=TrampolineFreeList;
TrampolineFreeList:=TrampolineFreeList^.Next;
// inc(Trampoline^.Block^.UsageCount);
Trampoline^.Call:=$e8;
Trampoline^.CallOffset:=pointer(@get_method_offset)-pointer(@Trampoline^.Call)-5;
Trampoline^.Jmp:=$e9;
Trampoline^.JmpOffset:=pointer(@TrampolineWndProc)-pointer(@Trampoline^.Jmp)-5;
Trampoline^.Method:=Method;
Result:=Trampoline;
finally
LeaveCriticalSection(CritObjectInstance);
end;
end;
procedure FreeObjectInstance(ObjectInstance: Pointer);
begin
EnterCriticalSection(CritObjectInstance);
try
// block gets overwritten by method dec(PMethodWrapperTrampoline(ObjectInstance)^.Block^.UsageCount);
PMethodWrapperTrampoline(ObjectInstance)^.Next:=TrampolineFreeList;
TrampolineFreeList:=PMethodWrapperTrampoline(ObjectInstance);
finally
LeaveCriticalSection(CritObjectInstance);
end;
end;
procedure DeleteInstBlockList;
var
hp : PWrapperBlock;
begin
EnterCriticalSection(CritObjectInstance);
try
while assigned(WrapperBlockList) do
begin
hp:=WrapperBlockList^.Next;
if VirtualFree(WrapperBlockList,4096,MEM_DECOMMIT) then
VirtualFree(WrapperBlockList,0,MEM_RELEASE);
WrapperBlockList:=hp;
end;
finally
LeaveCriticalSection(CritObjectInstance);
end;
end;
function AllocateHWnd(Method: TWndMethod): HWND;
begin
{ dummy }
runerror(217);
Result:=0;
end;
procedure DeallocateHWnd(Wnd: HWND);
begin
{ dummy }
runerror(217);
end;
initialization
WrapperBlockList:=nil;
TrampolineFreeList:=nil;
InitCriticalSection(CritObjectInstance);
CommonInit;
finalization
CommonCleanup;
DeleteInstBlockList;
DoneCriticalSection(CritObjectInstance);
end.
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