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db189468a9
found another means of doing startup/shutdown that doesn't require hooking and allows init callbacks to use CRT functions (avoiding problems similar to the recent rash of pre-libc bugs). also, callback registration no longer needs ugly #pragma syntax. remove 'Detours' (evil and no longer needed) This was SVN commit r5137.
89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
/**
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* =========================================================================
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* File : wstartup.cpp
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* Project : 0 A.D.
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* Description : windows-specific startup code
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#include "precompiled.h"
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#include "wstartup.h"
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#include "winit.h"
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//-----------------------------------------------------------------------------
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// shutdown
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// note: the alternative of using atexit has two disadvantages.
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// - the call to atexit must come after _cinit, which means we'd need to be
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// called manually from main (see discussion on init below)
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// - other calls to atexit from ctors or hidden compiler-generated init code
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// for static objects would cause those handlers to be called after ours,
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// which may cause shutdown order bugs.
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//-----------------------------------------------------------------------------
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// init
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// the init functions need to be called before any use of Windows-specific
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// code. in particular, static ctors may use whrt or wpthread, so we ought to
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// be initialized before them as well.
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//
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// one possibility is using WinMain as the entry point, and then calling the
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// application's main(), but this is expressly forbidden by the C standard.
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// VC apparently makes use of this and changes its calling convention.
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// if we call it, everything appears to work but stack traces in
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// release mode are incorrect (symbol address is off by 4).
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//
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// another alternative is re#defining the app's main function to app_main,
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// having the OS call our main, and then dispatching to app_main.
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// however, this leads to trouble when another library (e.g. SDL) wants to
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// do the same.
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// moreover, this file is compiled into a static library and used both for
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// the 0ad executable as well as the separate self-test. this means
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// we can't enable the main() hook for one and disable it in the other.
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//
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// requiring users to call us at the beginning of main is brittle in general,
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// comes after static ctors, and is difficult to achieve in external code
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// such as the (automatically generated) self-test.
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//
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// commandeering the entry point, doing init there and then calling
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// mainCRTStartup would work, but doesn't help with shutdown - additional
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// measures are required (see above). note that this approach means we're
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// initialized before _cinit, denying the use of non-stateless CRT functions.
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EXTERN_C void InitAndRegisterShutdown()
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{
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winit_CallInitFunctions();
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atexit(winit_CallShutdownFunctions);
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}
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#pragma data_seg(".CRT$XCB")
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EXTERN_C void(*pInitAndRegisterShutdown)() = InitAndRegisterShutdown;
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#pragma comment(linker, "/include:_pInitAndRegisterShutdown")
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#pragma data_seg()
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//-----------------------------------------------------------------------------
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// SEH wrapper
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#include "wdbg.h" // wdbg_exception_filter
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typedef int(*PfnIntVoid)(void);
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static int RunWithinTryBlock(PfnIntVoid func)
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{
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int ret;
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//__try
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{
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ret = func();
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}
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//__except(wdbg_exception_filter(GetExceptionInformation()))
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{
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ret = -1;
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}
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return ret;
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}
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