GRASS fatal error longjmp

Author: blazek

src/providers/grass/CMakeLists.txt

@@ -561,12 +561,10 @@ TARGET_LINK_LIBRARIES(grassprovider qgisgrass)
 # grass raster provider
 #
 
-IF (GRASS_MAJOR_VERSION LESS 7 )
-  QT4_WRAP_CPP(GRASS_RASTERPROVIDER_MOC_SRCS qgsgrassrasterprovider.h)
-  ADD_LIBRARY(grassrasterprovider MODULE qgsgrassrasterprovider.cpp ${GRASS_RASTERPROVIDER_MOC_SRCS})
-  SET_TARGET_PROPERTIES(grassrasterprovider PROPERTIES COMPILE_FLAGS "\"-DGRASS_EXPORT=${DLLEXPORT}\" \"-DGRASS_LIB_EXPORT=${DLLIMPORT}\"" )
-  TARGET_LINK_LIBRARIES(grassrasterprovider qgisgrass qgis_core)
-ENDIF (GRASS_MAJOR_VERSION LESS 7 )
+QT4_WRAP_CPP(GRASS_RASTERPROVIDER_MOC_SRCS qgsgrassrasterprovider.h)
+ADD_LIBRARY(grassrasterprovider MODULE qgsgrassrasterprovider.cpp ${GRASS_RASTERPROVIDER_MOC_SRCS})
+SET_TARGET_PROPERTIES(grassrasterprovider PROPERTIES COMPILE_FLAGS "\"-DGRASS_EXPORT=${DLLEXPORT}\" \"-DGRASS_LIB_EXPORT=${DLLIMPORT}\"" )
+TARGET_LINK_LIBRARIES(grassrasterprovider qgisgrass qgis_core)
 
 # override default path where built files are put to allow running qgis without installing
 # the modules go under libexec subdir

src/providers/grass/qgsgrass.cpp

@@ -14,6 +14,8 @@
  *                                                                         *
  ***************************************************************************/
 
+#include <setjmp.h>
+
 #include "qgsgrass.h"
 
 #include "qgslogger.h"
@@ -399,6 +401,8 @@ void QgsGrass::setMapset( QString gisdbase, QString location, QString mapset )
   for ( int i = 0; ms[i]; i++ )  G_add_mapset_to_search_path( ms[i] );
 }
 
+jmp_buf QgsGrass::jumper;
+
 int QgsGrass::initialized = 0;
 
 bool QgsGrass::active = 0;
@@ -432,11 +436,25 @@ int QgsGrass::error_routine( const char *msg, int fatal )
 
   if ( fatal )
   {
-    // we have to throw an exception here, otherwise GRASS >= 6.3 will kill our process
-    throw QgsGrass::Exception( QString::fromUtf8( msg ) );
+    QgsDebugMsg( "fatal -> longjmp" );
+    // Exceptions cannot be thrown from here if GRASS lib is not compiled with -fexceptions
+    //throw QgsGrass::Exception( QString::fromUtf8( msg ) );
+    lastError = FATAL;
+
+#if (GRASS_VERSION_MAJOR == 7) && (GRASS_VERSION_MINOR == 0)
+    // G_fatal_error in GRASS 7.0.0beta1 always exists the second time it is called.
+    if ( QString( GRASS_VERSION_RELEASE_STRING ) == "0beta1" )
+    {
+      QMessageBox::warning( 0, QObject::tr( "Warning" ), QObject::tr( "Fatal error occurred in GRASS library. QGIS gets over the error but any next fatal error will cause QGIS exit without warning. This is a problem of GRASS 7.0.0beta1 and hopefully will be fixed in higher GRASS versions. Error message: %1" ).arg( msg ) );
+    }
+#endif
+
+    longjmp( QgsGrass::jumper, 1 );
   }
   else
+  {
     lastError = WARNING;
+  }
 
   return 1;
 }
@@ -797,6 +815,7 @@ QStringList GRASS_LIB_EXPORT QgsGrass::vectors( QString mapsetPath )
 QStringList GRASS_LIB_EXPORT QgsGrass::vectorLayers( QString gisdbase,
     QString location, QString mapset, QString mapName )
 {
+  QgsDebugMsg( QString( "gisdbase = %1 location = %2 mapset = %3 mapName = %4" ).arg( gisdbase ).arg( location ).arg( mapset ).arg( mapName ) );
   QStringList list;
 
   // Set location
@@ -808,11 +827,15 @@ QStringList GRASS_LIB_EXPORT QgsGrass::vectorLayers( QString gisdbase,
   struct Map_info map;
   int level = -1;
 
-  try
+  // Vect_open_old_head GRASS is raising fatal error if topo exists but it is in different (older) version.
+  // It means that even we could open it on level one, it ends with exception,
+  // but we need level 2 anyway to get list of layers, so it does not matter, only the error message may be misleading.
+
+  G_TRY
   {
     level = Vect_open_old_head( &map, ( char * ) mapName.toUtf8().data(), ( char * ) mapset.toUtf8().data() );
   }
-  catch ( QgsGrass::Exception &e )
+  G_CATCH( QgsGrass::Exception &e )
   {
     Q_UNUSED( e );
     QgsDebugMsg( QString( "Cannot open GRASS vector: %1" ).arg( e.what() ) );
@@ -1376,11 +1399,11 @@ QgsCoordinateReferenceSystem GRASS_LIB_EXPORT QgsGrass::crsDirect( QString gisdb
   const char *oldlocale = setlocale( LC_NUMERIC, NULL );
   setlocale( LC_NUMERIC, "C" );
 
-  try
+  G_TRY
   {
     G_get_default_window( &cellhd );
   }
-  catch ( QgsGrass::Exception &e )
+  G_CATCH( QgsGrass::Exception &e )
   {
     Q_UNUSED( e );
     setlocale( LC_NUMERIC, oldlocale );

src/providers/grass/qgsgrass.h

@@ -16,9 +16,12 @@
 #ifndef QGSGRASS_H
 #define QGSGRASS_H
 
+#include <setjmp.h>
+
 // GRASS header files
 extern "C"
 {
+#include <grass/version.h>
 #include <grass/gis.h>
 #include <grass/form.h>
 }
@@ -34,12 +37,22 @@ extern "C"
 class QgsCoordinateReferenceSystem;
 class QgsRectangle;
 
+// Make the release string because it may be for example 0beta1
+#define STR(x) #x
+#define EXPAND(x) STR(x)
+#define GRASS_VERSION_RELEASE_STRING EXPAND( GRASS_VERSION_RELEASE )
+
+#define G_TRY try { if( !setjmp( QgsGrass::jumper ) )
+#define G_CATCH else { throw QgsGrass::Exception( QgsGrass::errorMessage() ); } } catch
+
 /*!
    Methods for C library initialization and error handling.
 */
 class QgsGrass
 {
   public:
+    static jmp_buf jumper; // used to get back from fatal error
+
     // This does not work (gcc/Linux), such exception cannot be caught
     // so I have enabled the old version, if you are able to fix it, please
     // check first if it realy works, i.e. can be caught!
@@ -93,9 +106,12 @@ class QgsGrass
     static GRASS_LIB_EXPORT void setMapset( QString gisdbase, QString location, QString mapset );
 
     //! Error codes returned by error()
-    enum GERROR { OK, /*!< OK. No error. */
-                  WARNING /*!< Warning, non fatal error. Should be printed by application. */
-              };
+    enum GERROR
+    {
+      OK, /*!< OK. No error. */
+      WARNING, /*!< Warning, non fatal error. Should be printed by application. */
+      FATAL /*!< Fatal error */
+    };
 
     //! Map type
     enum MapType { None, Raster, Vector, Region };

src/providers/grass/qgsgrassprovider.cpp

@@ -799,13 +799,13 @@ int QgsGrassProvider::openMap( QString gisdbase, QString location, QString mapse
 
   // Do we have topology and cidx (level2)
   int level = 2;
-  try
+  G_TRY
   {
     Vect_set_open_level( 2 );
     Vect_open_old_head( map.map, mapName.toUtf8().data(), mapset.toUtf8().data() );
     Vect_close( map.map );
   }
-  catch ( QgsGrass::Exception &e )
+  G_CATCH( QgsGrass::Exception &e )
   {
     Q_UNUSED( e );
     QgsDebugMsg( QString( "Cannot open GRASS vector head on level2: %1" ).arg( e.what() ) );
@@ -823,12 +823,12 @@ int QgsGrassProvider::openMap( QString gisdbase, QString location, QString mapse
   }
 
   // Open vector
-  try
+  G_TRY
   {
     Vect_set_open_level( level );
     Vect_open_old( map.map, mapName.toUtf8().data(), mapset.toUtf8().data() );
   }
-  catch ( QgsGrass::Exception &e )
+  G_CATCH( QgsGrass::Exception &e )
   {
     Q_UNUSED( e );
     QgsDebugMsg( QString( "Cannot open GRASS vector: %1" ).arg( e.what() ) );
@@ -837,7 +837,7 @@ int QgsGrassProvider::openMap( QString gisdbase, QString location, QString mapse
 
   if ( level == 1 )
   {
-    try
+    G_TRY
     {
 #if defined(GRASS_VERSION_MAJOR) && defined(GRASS_VERSION_MINOR) && \
     ( ( GRASS_VERSION_MAJOR == 6 && GRASS_VERSION_MINOR >= 4 ) || GRASS_VERSION_MAJOR > 6 )
@@ -846,7 +846,7 @@ int QgsGrassProvider::openMap( QString gisdbase, QString location, QString mapse
       Vect_build( map.map, stderr );
 #endif
     }
-    catch ( QgsGrass::Exception &e )
+    G_CATCH( QgsGrass::Exception &e )
     {
       Q_UNUSED( e );
       QgsDebugMsg( QString( "Cannot build topology: %1" ).arg( e.what() ) );
@@ -891,12 +891,12 @@ void QgsGrassProvider::updateMap( int mapId )
   map->lastAttributesModified = di.lastModified();
 
   // Reopen vector
-  try
+  G_TRY
   {
     Vect_set_open_level( 2 );
     Vect_open_old( map->map, map->mapName.toUtf8().data(), map->mapset.toUtf8().data() );
   }
-  catch ( QgsGrass::Exception &e )
+  G_CATCH( QgsGrass::Exception &e )
   {
     Q_UNUSED( e );
     QgsDebugMsg( QString( "Cannot reopen GRASS vector: %1" ).arg( e.what() ) );

src/providers/grass/qgsgrassprovidermodule.cpp

@@ -79,6 +79,8 @@ bool QgsGrassMapsetItem::isMapset( QString path )
 
 QVector<QgsDataItem*> QgsGrassMapsetItem::createChildren()
 {
+  QgsDebugMsg( "Entered" );
+
   QVector<QgsDataItem*> items;
 
   QStringList vectorNames = QgsGrass::vectors( mPath );

src/providers/grass/qgsgrassrasterprovider.h

@@ -22,7 +22,11 @@
 
 extern "C"
 {
+#include <grass/version.h>
 #include <grass/gis.h>
+#if GRASS_VERSION_MAJOR > 6
+#include <grass/raster.h>
+#endif
 }
 
 #include "qgscoordinatereferencesystem.h"