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Added code to produce dump files on Windows builds to aid with debugging server crashes

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git-svn-id: http://mc-server.googlecode.com/svn/trunk@306 0a769ca7-a7f5-676a-18bf-c427514a06d6
This commit is contained in:
madmaxoft@gmail.com 2012-02-21 21:09:42 +00:00
parent be0a659153
commit 16da9e07ae
1 changed files with 85 additions and 0 deletions
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85
source/main.cpp
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@ -7,6 +7,10 @@
#include <csignal> //std::signal
#include <stdlib.h> //exit()
#ifdef _WIN32
#include <dbghelp.h>
#endif // _WIN32
#include "SquirrelBindings.h"
#if USE_SQUIRREL
#pragma warning(push)
@ -51,6 +55,72 @@ void ShowCrashReport(int)
#ifdef _WIN32
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Windows stuff: when the server crashes, create a "dump file" containing the callstack of each thread and some variables; let the user send us that crash file for analysis
typedef BOOL (WINAPI *pMiniDumpWriteDump)(
HANDLE hProcess,
DWORD ProcessId,
HANDLE hFile,
MINIDUMP_TYPE DumpType,
PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam,
PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam,
PMINIDUMP_CALLBACK_INFORMATION CallbackParam
);
pMiniDumpWriteDump g_WriteMiniDump; // The function in dbghlp DLL that creates dump files
char g_DumpFileName[MAX_PATH]; // Filename of the dump file; hes to be created before the dump handler kicks in
char g_ExceptionStack[128 * 1024]; // Substitute stack, just in case the handler kicks in because of "insufficient stack space"
MINIDUMP_TYPE DumpFlags = MiniDumpNormal; // By default dump only the stack and some helpers
/** This function gets called just before the "program executed an illegal instruction and will be terminated" or similar.
Its purpose is to create the crashdump using the dbghlp DLLs
*/
LONG WINAPI LastChanceExceptionFilter(__in struct _EXCEPTION_POINTERS * a_ExceptionInfo)
{
char * newStack = &g_ExceptionStack[sizeof(g_ExceptionStack)];
char * oldStack;
// Use the substitute stack:
_asm
{
mov oldStack, esp
mov esp, newStack
}
MINIDUMP_EXCEPTION_INFORMATION ExcInformation;
ExcInformation.ThreadId = GetCurrentThreadId();
ExcInformation.ExceptionPointers = a_ExceptionInfo;
ExcInformation.ClientPointers = 0;
// Write the dump file:
HANDLE dumpFile = CreateFile(g_DumpFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
g_WriteMiniDump(GetCurrentProcess(), GetCurrentProcessId(), dumpFile, DumpFlags, (a_ExceptionInfo) ? &ExcInformation : NULL, NULL, NULL);
CloseHandle(dumpFile);
// Revert to old stack:
_asm
{
mov esp, oldStack
}
return 0;
}
#endif // _WIN32
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// main:
int main( int argc, char **argv )
{
(void)argc;
@ -60,6 +130,18 @@ int main( int argc, char **argv )
InitLeakFinder();
#endif
// Magic code to produce dump-files on Windows if the server crashes:
#ifdef _WIN32
HINSTANCE hDbgHelp = LoadLibrary("DBGHELP.DLL");
g_WriteMiniDump = (pMiniDumpWriteDump)GetProcAddress(hDbgHelp, "MiniDumpWriteDump");
if (g_WriteMiniDump != NULL)
{
_snprintf_s(g_DumpFileName, ARRAYCOUNT(g_DumpFileName), _TRUNCATE, "crash_mcs_%x.dmp", GetCurrentProcessId());
SetUnhandledExceptionFilter(LastChanceExceptionFilter);
}
#endif // _WIN32
// End of dump-file magic
#ifdef _DEBUG
_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
@ -73,6 +155,9 @@ int main( int argc, char **argv )
std::signal(SIGSEGV, ShowCrashReport);
#endif
// DEBUG: test the dumpfile creation:
// *((int *)0) = 0;
try
{
cRoot Root;