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debugging improvements
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jef-n committed Jul 27, 2013
1 parent 51dbbe1 commit e4fed7418d500d9312fd88f56a7af54e8aaa032d
Showing with 148 additions and 41 deletions.
  1. +148 −41 src/app/main.cpp
@@ -41,6 +41,7 @@
#include <cstdio>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

#ifdef WIN32
// Open files in binary mode
@@ -83,6 +84,8 @@ typedef SInt32 SRefCon;
#include <unistd.h>
#include <execinfo.h>
#include <signal.h>
#include <sys/wait.h>
#include <errno.h>
#endif

/** print usage text
@@ -193,38 +196,159 @@ void qgisCrash( int signal )
{
qFatal( "QGIS died on signal %d", signal );
}
#endif

void dumpBacktrace()
void myPrint( const char *fmt, ... )
{
if ( access( "/usr/bin/c++filt", X_OK ) )
va_list ap;
va_start( ap, fmt );
#if defined(Q_OS_WIN)
char buffer[1024];
vsnprintf( buffer, sizeof buffer, fmt, ap );
OutputDebugString( buffer );
#else
vfprintf( stderr, fmt, ap );
#endif
}

void dumpBacktrace( unsigned int depth = 0 )
{
if ( depth == 0 )
depth = 10;

#if (defined(linux) && !defined(ANDROID)) || defined(__FreeBSD__)
#if defined(linux) && !defined(ANDROID)
if ( QgsLogger::debugLevel() >= 4 )
{
static int gdbRunning = -1;
static int gdbpipe[2];
static int gdbpid;

if ( gdbRunning == -1 )
{
gdbRunning = 0;

myPrint( "starting gdb\n" );
if ( access( "/usr/bin/gdb", X_OK ) == 0 )
{
// take full stacktrace using gdb
// http://stackoverflow.com/questions/3151779/how-its-better-to-invoke-gdb-from-program-to-print-its-stacktrace

char exename[512];
int len = readlink( "/proc/self/exe", exename, sizeof( exename ) - 1 );
if ( len < 0 )
{
myPrint( "Could not read link.\n" );
}
else
{
exename[ len ] = 0;

if ( pipe( gdbpipe ) == 0 )
{
char pidstr[32];
snprintf( pidstr, sizeof pidstr, "--pid=%d", getpid() );

gdbpid = fork();
fprintf( stderr, "fork returned: %d\n", gdbpid );
if ( gdbpid == 0 )
{
close( STDIN_FILENO ); // close stdin
dup( gdbpipe[0] ); // stdin from pipe
close( gdbpipe[1] ); // close writing end

// attach, backtrace and continue
char btcmd[32];
snprintf( btcmd, sizeof btcmd, "bt full %u", depth );

execl( "/usr/bin/gdb", "gdb", "-q", "-ex", "set height 0", "-n", pidstr, "-ex", "thread", "-ex", btcmd, "-ex", "cont", exename, NULL );
perror( "could not start gdb" );
exit( 0 );
}
else if ( gdbpid >= 0 )
{
close( gdbpipe[0] ); // close reading end
gdbRunning = 1;
}
else
{
myPrint( "Could not start gdb (%d:%s).\n", errno, strerror( errno ) );
}
}
else
{
myPrint( "Could not create pipe (%d:%s).\n", errno, strerror( errno ) );
}
}
}
else
{
myPrint( "gdb not available.\n" );
}
}
else if ( gdbRunning == 1 )
{
myPrint( "Stacktrace (using gdb):\n" );
char btcmd[20];
snprintf( btcmd, sizeof btcmd, "bt full %u\ncont\n", depth );
if ( write( gdbpipe[1], btcmd, strlen( btcmd ) ) == ( int ) strlen( btcmd ) && kill( gdbpid, SIGINT ) == 0 )
return;

myPrint( "write error to gdb [%d:%s]\n", errno, strerror( errno ) );
gdbRunning = 0;
}
}
#endif

if ( access( "/usr/bin/c++filt", X_OK ) < 0 )
{
( void ) write( STDERR_FILENO, "Stacktrace (c++filt NOT FOUND):\n", 32 );
myPrint( "Stacktrace (c++filt NOT FOUND):\n" );
}
else
{
int fd[2];

if ( pipe( fd ) == 0 && fork() == 0 )
{
close( STDIN_FILENO );
close( fd[1] );
dup( fd[0] );
close( STDIN_FILENO ); // close stdin
dup( fd[0] ); // stdin from pipe
close( fd[1] ); // close writing end
execl( "/usr/bin/c++filt", "c++filt", ( char * ) 0 );
perror( "could not start c++filt" );
exit( 1 );
}

( void ) write( STDERR_FILENO, "Stacktrace (piped through c++filt):\n", 36 );

close( STDERR_FILENO );
close( fd[0] );
dup( fd[1] );
myPrint( "Stacktrace (piped through c++filt):\n" );
close( fd[0] ); // close reading end
close( STDERR_FILENO ); // close stderr
dup( fd[1] ); // stderr to pipe
}

void *buffer[256];
int nptrs = backtrace( buffer, sizeof( buffer ) / sizeof( *buffer ) );
void **buffer = new void *[ depth ];
int nptrs = backtrace( buffer, depth );
backtrace_symbols_fd( buffer, nptrs, STDERR_FILENO );
}
delete [] buffer;
#elif defined(Q_OS_WIN)
void **buffer = new void *[ depth ];

SymSetOptions( SYMOPT_DEFERRED_LOADS | SYMOPT_INCLUDE_32BIT_MODULES | SYMOPT_UNDNAME );
SymInitialize( GetCurrentProcess(), "http://msdl.microsoft.com/download/symbols", TRUE );

unsigned short nFrames = CaptureStackBackTrace( 1, depth, buffer, NULL );
SYMBOL_INFO *symbol = ( SYMBOL_INFO * ) qgsMalloc( sizeof( SYMBOL_INFO ) + 256 );
symbol->MaxNameLen = 255;
symbol->SizeOfStruct = sizeof( SYMBOL_INFO );

for ( int i = 0; i < nFrames; i++ )
{
SymFromAddr( GetCurrentProcess(), ( DWORD64 )( buffer[ i ] ), 0, symbol );
symbol->Name[ 255 ] = 0;
myPrint( "%d: %s [%x]\n", i, symbol->Name, symbol->Address );
}

qgsFree( symbol );
#endif
}

/*
* Hook into the qWarning/qFatal mechanism so that we can channel messages
@@ -242,31 +366,19 @@ void myMessageOutput( QtMsgType type, const char *msg )
switch ( type )
{
case QtDebugMsg:
fprintf( stderr, "Debug: %s\n", msg );
#if (defined(linux) && !defined(ANDROID)) || defined(__FreeBSD__)
myPrint( "%s\n", msg );
if ( strncmp( msg, "Backtrace", 9 ) == 0 )
dumpBacktrace();
#endif
dumpBacktrace( atoi( msg + 9 ) );
break;
case QtCriticalMsg:
fprintf( stderr, "Critical: %s\n", msg );
myPrint( "Critical: %s\n", msg );
break;
case QtWarningMsg:
fprintf( stderr, "Warning: %s\n", msg );
myPrint( "Warning: %s\n", msg );

#ifdef QGISDEBUG
if ( 0 == strncmp( msg, "Object::", 8 )
|| 0 == strncmp( msg, "QWidget::", 9 )
|| 0 == strncmp( msg, "QPainter::", 10 )
)
{
#if 0
#if (defined(linux) && !defined(ANDROID)) || defined(__FreeBSD__)
dumpBacktrace();
#endif
#endif
QgsMessageLog::logMessage( msg, "Qt" );
}
dumpBacktrace( 20 );
QgsMessageLog::logMessage( msg, "Qt" );
#endif

// TODO: Verify this code in action.
@@ -279,11 +391,9 @@ void myMessageOutput( QtMsgType type, const char *msg )
break;
case QtFatalMsg:
{
fprintf( stderr, "Fatal: %s\n", msg );
#if (defined(linux) && !defined(ANDROID)) || defined(__FreeBSD__)
dumpBacktrace();
#endif
abort(); // deliberately core dump
myPrint( "Fatal: %s\n", msg );
dumpBacktrace( 256 );
abort(); // deliberately dump core
}
}
}
@@ -299,10 +409,10 @@ int main( int argc, char *argv[] )
#endif // _MSC_VER
#endif // WIN32

#if (defined(linux) && !defined(ANDROID)) || defined(__FreeBSD__)
// Set up the custom qWarning/qDebug custom handler
qInstallMsgHandler( myMessageOutput );

#if (defined(linux) && !defined(ANDROID)) || defined(__FreeBSD__)
signal( SIGQUIT, qgisCrash );
signal( SIGILL, qgisCrash );
signal( SIGFPE, qgisCrash );
@@ -775,9 +885,6 @@ int main( int argc, char *argv[] )
}
}

#ifdef QGISDEBUG
// QgsDebugMsg(QString("Setting translation to %1/qgis_%2").arg(i18nPath).arg(myTranslationCode));
#endif
QTranslator qgistor( 0 );
if ( qgistor.load( QString( "qgis_" ) + myTranslationCode, i18nPath ) )
{

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