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/**
* @file llwindebug.cpp
* @brief Windows debugging functions
*
* $LicenseInfo:firstyear=2004&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "llviewerprecompiledheaders.h"
#include "llwindebug.h"
#include "lldir.h"
// based on dbghelp.h
typedef bool (WINAPI *MINIDUMPWRITEDUMP)(HANDLE hProcess, DWORD dwPid, HANDLE hFile, MINIDUMP_TYPE DumpType,
CONST PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam,
CONST PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam,
CONST PMINIDUMP_CALLBACK_INFORMATION CallbackParam
);
MINIDUMPWRITEDUMP f_mdwp = NULL;
class LLMemoryReserve {
public:
LLMemoryReserve();
~LLMemoryReserve();
void reserve();
void release();
private:
unsigned char *mReserve;
static const size_t MEMORY_RESERVATION_SIZE;
};
LLMemoryReserve::LLMemoryReserve() :
mReserve(NULL)
{
}
LLMemoryReserve::~LLMemoryReserve()
{
release();
}
// I dunno - this just seemed like a pretty good value.
const size_t LLMemoryReserve::MEMORY_RESERVATION_SIZE = 5 * 1024 * 1024;
void LLMemoryReserve::reserve()
{
if(NULL == mReserve)
{
mReserve = new unsigned char[MEMORY_RESERVATION_SIZE];
}
}
void LLMemoryReserve::release()
{
if (NULL != mReserve)
{
delete [] mReserve;
}
mReserve = NULL;
}
static LLMemoryReserve gEmergencyMemoryReserve;
LONG NTAPI vectoredHandler(PEXCEPTION_POINTERS exception_infop)
{
LLWinDebug::instance().generateMinidump(exception_infop);
return EXCEPTION_CONTINUE_SEARCH;
}
// static
void LLWinDebug::initSingleton()
{
static bool s_first_run = true;
// Load the dbghelp dll now, instead of waiting for the crash.
// Less potential for stack mangling
// Don't install vectored exception handler if being debugged.
if(IsDebuggerPresent()) return;
if (s_first_run)
{
// First, try loading from the directory that the app resides in.
std::string local_dll_name = gDirUtilp->findFile("dbghelp.dll", gDirUtilp->getWorkingDir(), gDirUtilp->getExecutableDir());
HMODULE hDll = NULL;
hDll = LoadLibraryA(local_dll_name.c_str());
if (!hDll)
{
hDll = LoadLibrary(L"dbghelp.dll");
}
if (!hDll)
{
LL_WARNS("AppInit") << "Couldn't find dbghelp.dll!" << LL_ENDL;
}
else
{
f_mdwp = (MINIDUMPWRITEDUMP) GetProcAddress(hDll, "MiniDumpWriteDump");
if (!f_mdwp)
{
FreeLibrary(hDll);
hDll = NULL;
}
}
gEmergencyMemoryReserve.reserve();
s_first_run = false;
// Add this exeption hanlder to save windows style minidump.
AddVectoredExceptionHandler(0, &vectoredHandler);
}
}
void LLWinDebug::cleanupSingleton()
{
gEmergencyMemoryReserve.release();
}
void LLWinDebug::writeDumpToFile(MINIDUMP_TYPE type, MINIDUMP_EXCEPTION_INFORMATION *ExInfop, const std::string& filename)
{
// Temporary fix to switch out the code that writes the DMP file.
// Fix coming that doesn't write a mini dump file for regular C++ exceptions.
const bool enable_write_dump_file = false;
if ( enable_write_dump_file )
{
if(f_mdwp == NULL || gDirUtilp == NULL)
{
return;
}
else
{
std::string dump_path = gDirUtilp->getExpandedFilename(LL_PATH_LOGS, filename);
HANDLE hFile = CreateFileA(dump_path.c_str(),
GENERIC_WRITE,
FILE_SHARE_WRITE,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (hFile != INVALID_HANDLE_VALUE)
{
// Write the dump, ignoring the return value
f_mdwp(GetCurrentProcess(),
GetCurrentProcessId(),
hFile,
type,
ExInfop,
NULL,
NULL);
CloseHandle(hFile);
}
}
}
}
// static
void LLWinDebug::generateMinidump(struct _EXCEPTION_POINTERS *exception_infop)
{
std::string dump_path = gDirUtilp->getExpandedFilename(LL_PATH_LOGS,
"SecondLifeException");
if (exception_infop)
{
// Since there is exception info... Release the hounds.
gEmergencyMemoryReserve.release();
_MINIDUMP_EXCEPTION_INFORMATION ExInfo;
ExInfo.ThreadId = ::GetCurrentThreadId();
ExInfo.ExceptionPointers = exception_infop;
ExInfo.ClientPointers = NULL;
writeDumpToFile((MINIDUMP_TYPE)(MiniDumpWithDataSegs | MiniDumpWithIndirectlyReferencedMemory), &ExInfo, "SecondLife.dmp");
}
}
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