PyGeNN exception handling

generate_swig_interfaces.py

@@ -39,6 +39,7 @@
 from itertools import product
 from string import Template # for better text substitutions
 from argparse import ArgumentParser # to parse command line args
+from textwrap import dedent
 
 # module attributes
 NEURONMODELS = 'neuronModels'
@@ -173,7 +174,21 @@ def addSwigTemplate( self, tSpec, newName ):
     def addCppInclude( self, cHeader, comment='' ):
         '''Adds a line for usual including C/C++ header file.'''
         self.write( '#include {} {}\n'.format( cHeader, comment ) )
-
+
+    def addStandardExceptionHandler(self):
+        self.write(dedent(
+        """
+        %exception {
+            try {
+                $action
+            }
+            SWIG_CATCH_STDEXCEPT // catch std::exception
+            catch (...) {
+                SWIG_exception(SWIG_UnknownError, "Unknown exception");
+            }
+          }
+        """))
+
     def addAutoGenWarning( self ):
         '''Adds a comment line telling that this file was generated automatically'''
         self.write( '// This code was generated by ' + os.path.split(__file__)[1] + '. DO NOT EDIT\n' )
@@ -301,7 +316,11 @@ def generateSharedLibraryModelInterface( swigPath ):
             mg.addCppInclude( '"sharedLibraryModelNumpy.h"' )
 
         mg.addSwigInclude( '<std_string.i>' )
+        mg.addSwigInclude( '<exception.i>' )
         mg.addSwigInclude( '"numpy.i"' )
+
+        mg.addStandardExceptionHandler()
+
         with SwigInitScope( mg ):
             mg.write( 'import_array();\n')
 
@@ -406,7 +425,7 @@ def generateCustomModelDeclImpls(swigPath):
             if model == CUSTOMUPDATEMODELS:
                 mg.addCppInclude( '"customVarReferences.h"' )
                 mg.addCppInclude( '"customWUVarReferences.h"' )
-
+            
             mg.write(generateCustomClassDeclaration(nSpace, model==INITVARSNIPPET or model==SPARSEINITSNIPPET, 
                                                     model==WUPDATEMODELS, model==CUSTOMUPDATEMODELS))
         with SwigModuleGenerator( 'impl',
@@ -425,6 +444,9 @@ def generateBackend(swigPath, folder, namespace):
         mg.addSwigEnableUnderCaseConvert()
         mg.addSwigInclude('<exception.i>')
 
+        # Add exception handler
+        mg.addStandardExceptionHandler()
+
         with SwigAsIsScope(mg):
             mg.addCppInclude('<plog/Appenders/ConsoleAppender.h>')
             mg.addCppInclude('"optimiser.h"')
@@ -456,22 +478,6 @@ def generateBackend(swigPath, folder, namespace):
         # Import stl containers so as to support std::string
         mg.addSwigImport( '"StlContainers.i"' )
 
-        # Include SWIG exception handling library
-        mg.addSwigInclude('<exception.i>')
-
-        mg.write('''
-        %exception create_backend{
-            try 
-            {
-                $action
-            } 
-            SWIG_CATCH_STDEXCEPT
-            catch (...) {
-                SWIG_exception(SWIG_UnknownError, "Unknown exception");
-            }
-        }
-        ''')
-
         # To prevent having to expose filesystem, simply export a wrapper that converts a string to a filesystem::path and calls createBackend
         with SwigInlineScope(mg):
             mg.write('CodeGenerator::' + namespace + '::Backend create_backend(const ModelSpecInternal &model, const std::string &outputPath, plog::Severity backendLevel, const CodeGenerator::' + namespace + '::Preferences &preferences)\n'
@@ -526,6 +532,8 @@ def generateConfigs(gennPath, backends):
 
         pygennSmg.addAutoGenWarning()
         pygennSmg.addSwigModuleHeadline()
+        pygennSmg.addSwigInclude( '<exception.i>' )
+        pygennSmg.addStandardExceptionHandler()
         with SwigAsIsScope( pygennSmg ):
             pygennSmg.addCppInclude( '<fstream>' )
             pygennSmg.addCppInclude( '<plog/Appenders/ConsoleAppender.h>' )
@@ -607,6 +615,8 @@ def generateConfigs(gennPath, backends):
             pygennSmg.addSwigImport( '"' + mg.name + '.i"' )
             mg.addAutoGenWarning()
             mg.addSwigModuleHeadline( directors = True )
+            mg.addSwigInclude( '<exception.i>' )
+            mg.addStandardExceptionHandler()
             with SwigAsIsScope( mg ):
                 mg.addCppInclude( '"' + headerFilename + '"' )
                 mg.addCppInclude( '"' + headerFilename.split('.')[0] + 'Custom.h"' )

pygenn/genn_wrapper/swig/Models.i

@@ -33,6 +33,7 @@
 %ignore LegacyWrapper;
 
 %include <std_vector.i>
+%include <exception.i>
 
 %import "Snippet.i"
 %import "InitVarSnippet.i"
@@ -51,6 +52,17 @@
 %template(VarVector) std::vector<Models::Base::Var>;
 %template(VarRefVector) std::vector<Models::Base::VarRef>;
 
+// Add standard exception handler
+%exception {
+    try {
+        $action
+    }
+    SWIG_CATCH_STDEXCEPT // catch std::exception
+    catch (...) {
+        SWIG_exception(SWIG_UnknownError, "Unknown exception");
+    }
+}
+
 %include "models.h"
 %include "varAccess.h"
 

pygenn/genn_wrapper/swig/Snippet.i

@@ -17,6 +17,7 @@
 %}
 %include <std_string.i>
 %include <std_vector.i>
+%include <exception.i>
 
 %feature("flatnested", "1");
 %rename("%(undercase)s", %$isfunction, notregexmatch$name="add[a-zA-Z]*Population", notregexmatch$name="addCurrentSource", notregexmatch$name="addCustomUpdate", notregexmatch$name="assignExternalPointer[a-zA-Z]*") "";
@@ -26,6 +27,16 @@
 
 %feature("director") Snippet::Base; // for inheritance in python
 
+// Add standard exception handler
+%exception {
+    try {
+        $action
+    }
+    SWIG_CATCH_STDEXCEPT // catch std::exception
+    catch (...) {
+        SWIG_exception(SWIG_UnknownError, "Unknown exception");
+    }
+}
 
 // flatten nested classes
 %rename (EGP) Snippet::Base::EGP;