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cpython/PC/frozen_dllmain.c at pythoncore_fix · ammaraskar/cpython · GitHub
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frozen_dllmain.c
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/* FreezeDLLMain.cpp
This is a DLLMain suitable for frozen applications/DLLs on
a Windows platform.
The general problem is that many Python extension modules may define
DLL main functions, but when statically linked together to form
a frozen application, this DLLMain symbol exists multiple times.
The solution is:
* Each module checks for a frozen build, and if so, defines its DLLMain
function as "__declspec(dllexport) DllMain%module%"
(eg, DllMainpythoncom, or DllMainpywintypes)
* The frozen .EXE/.DLL links against this module, which provides
the single DllMain.
* This DllMain attempts to locate and call the DllMain for each
of the extension modules.
* This code also has hooks to "simulate" DllMain when used from
a frozen .EXE.
At this stage, there is a static table of "possibly embedded modules".
This should change to something better, but it will work OK for now.
Note that this scheme does not handle dependencies in the order
of DllMain calls - except it does call pywintypes first :-)
As an example of how an extension module with a DllMain should be
changed, here is a snippet from the pythoncom extension module.
// end of example code from pythoncom's DllMain.cpp
#ifndef BUILD_FREEZE
#define DLLMAIN DllMain
#define DLLMAIN_DECL
#else
#define DLLMAIN DllMainpythoncom
#define DLLMAIN_DECL __declspec(dllexport)
#endif
extern "C" DLLMAIN_DECL
BOOL WINAPI DLLMAIN(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
// end of example code from pythoncom's DllMain.cpp
***************************************************************************/
#include
"windows.h"
static
char
*
possibleModules
[]
=
{
"pywintypes"
,
"pythoncom"
,
"win32ui"
,
NULL
,
};
BOOL
CallModuleDllMain
(
char
*
modName
,
DWORD
dwReason
);
/*
Called by a frozen .EXE only, so that built-in extension
modules are initialized correctly
*/
void
PyWinFreeze_ExeInit
(
void
)
{
char
*
*
modName
;
for
(
modName
=
possibleModules
;
*
modName
;
*
modName
++
) {
/* printf("Initialising '%s'\n", *modName); */
CallModuleDllMain
(
*
modName
,
DLL_PROCESS_ATTACH
);
}
}
/*
Called by a frozen .EXE only, so that built-in extension
modules are cleaned up
*/
void
PyWinFreeze_ExeTerm
(
void
)
{
// Must go backwards
char
*
*
modName
;
for
(
modName
=
possibleModules
+
Py_ARRAY_LENGTH
(
possibleModules
)
-
2
;
modName
>=
possibleModules
;
*
modName
--
) {
/* printf("Terminating '%s'\n", *modName);*/
CallModuleDllMain
(
*
modName
,
DLL_PROCESS_DETACH
);
}
}
BOOL
WINAPI
DllMain
(
HINSTANCE
hInstance
,
DWORD
dwReason
,
LPVOID
lpReserved
)
{
BOOL
ret
=
TRUE;
switch
(
dwReason
) {
case
DLL_PROCESS_ATTACH
:
{
char
*
*
modName
;
for
(
modName
=
possibleModules
;
*
modName
;
*
modName
++
) {
BOOL
ok
=
CallModuleDllMain
(
*
modName
,
dwReason
);
if
(!
ok
)
ret
=
FALSE;
}
break
;
}
case
DLL_PROCESS_DETACH
:
{
// Must go backwards
char
*
*
modName
;
for
(
modName
=
possibleModules
+
Py_ARRAY_LENGTH
(
possibleModules
)
-
2
;
modName
>=
possibleModules
;
*
modName
--
)
CallModuleDllMain
(
*
modName
,
DLL_PROCESS_DETACH
);
break
;
}
}
return
ret
;
}
BOOL
CallModuleDllMain
(
char
*
modName
,
DWORD
dwReason
)
{
BOOL
(
WINAPI
*
pfndllmain
)(
HINSTANCE
,
DWORD
,
LPVOID
);
char
funcName
[
255
];
HMODULE
hmod
=
GetModuleHandleW
(
NULL
);
strcpy
(
funcName
,
"_DllMain"
);
strcat
(
funcName
,
modName
);
strcat
(
funcName
,
"@12"
);
// stdcall convention.
pfndllmain
=
(
BOOL
(
WINAPI
*
)(
HINSTANCE
,
DWORD
,
LPVOID
))
GetProcAddress
(
hmod
,
funcName
);
if
(
pfndllmain
==
NULL
) {
/* No function by that name exported - then that module does
not appear in our frozen program - return OK
*/
return
TRUE;
}
return
(
*
pfndllmain
)(
hmod
,
dwReason
,
NULL
);
}
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