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133 lines
3.8 KiB
ObjectPascal
133 lines
3.8 KiB
ObjectPascal
unit fpmingw;
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{
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This file is part of the Free Pascal Integrated Development Environment
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Copyright (c) 2009 by Marco van de Voort
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Mingw helpers. Currently mostly atexit.
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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interface
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// mingw put atexit in binaries, so that it can have one atexit, and call it from
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// dll and .exe startup code.
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// This unit provides a similar service for when mingw code (read: libgdb and friends) are statically
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// linked to FPC.
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Type
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TCFunction = function:longint cdecl; // prototype of an handler to be registered with atexit
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function atexit(p:TCFunction):longint; cdecl; // export our own atexit handler
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implementation
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uses
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windows,
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gdbint; // force dependancies that hopefully make it execute at the right moment.
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// prototype of atexit:
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Type
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TAtexitFunction = function(p:TCFUnction):longint cdecl;
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{$ifdef win64}
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var __imp_atexit : TAtExitFunction; Cvar; external; // "true" atexit in mingw libs.
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{$else not win64}
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var _imp__atexit : TAtExitFunction; Cvar; external; // "true" atexit in mingw libs.
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{$endif not win64}
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var
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hMsvcrt : HModule = 0;
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free_Msvcrt : boolean;
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{$ifdef win32}
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fctMsvcrtLongJmp : pointer;cvar;external;
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{$else not win32}
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fctMsvcrtLongJmp : pointer;cvar;
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{$endif not win32}
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function atexit(p:TCFunction):longint;cdecl; [public, alias : '_atexit'];
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begin
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{$ifdef win64}
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atexit:=__imp_atexit(p); // simply route to "true" atexit
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{$else not win64}
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atexit:=_imp__atexit(p); // simply route to "true" atexit
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{$endif not win64}
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end;
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{$ifdef win32}
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procedure __cpu_features_init; cdecl; external;
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{$endif win32}
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procedure _pei386_runtime_relocator; cdecl; external;
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procedure __main; cdecl;external;
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procedure doinit;
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// other mingw initialization. Sequence from crt1.c
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begin
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// not (yet) done: set mingw exception handlers:
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// SetUnhandledExceptionFilter (_gnu_exception_handler);
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{$ifdef win32}
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__cpu_features_init; // load CPU features. Might be useful for debugger :-)
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{$endif win32}
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// fpreset; // don't do this, we init our own fp mask
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// _mingw32_init_mainargs (); // mingw doesn't handle arguments not necessary.
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// _mingw32_init_fmode (); // Set default filemode. Is not done for libraries, so we don't.
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// Adust references to dllimported data that have non-zero offsets.
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_pei386_runtime_relocator; //
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// aligns stack here to 16 bytes
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{From libgcc.a, __main calls global class constructors via
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__do_global_ctors, This in turn registers __do_global_dtors
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as the first entry of the app's atexit table. We do this
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explicitly at app startup rather than rely on gcc to generate
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the call in main's prologue, since main may be imported from a dll
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which has its own __do_global_ctors. }
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{$ifdef win64}
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if (hMsvcrt=0) then
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hMsvcrt := GetModuleHandleA ('msvcrt.dll');
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if (hMsvcrt=0) then
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begin
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hMsvcrt := LoadLibraryA ('msvcrt.dll');
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free_Msvcrt := true;
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end;
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fctMsvcrtLongJmp := GetProcAddress(hMsvcrt, 'longjmp');
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// __main; // should be libgcc initialization but this causes infinite loop.
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{$endif win64}
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end;
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procedure _cexit; cdecl; external;
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procedure doatexit;
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begin
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{
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* Perform exit processing for the C library. This means
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* flushing output and calling 'atexit' registered functions.
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}
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if free_Msvcrt and (hMsvcrt<>0) then
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begin
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free_Msvcrt := false;
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FreeLibrary (hMsvcrt);
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hMsvcrt := 0;
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end;
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_cexit ();
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end;
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initialization
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doinit;
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finalization
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doatexit;
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end.
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