Initial code generation for NEURON (#1078)

* Renamed CodegenCppVisitor to CodegenCoreneuronCppVisitor

* Added NEURON code generator (CodegenNeuronCppVisitor) with comments and scaffold of the needed functions

* Created abstract class CodegenCppVisitor for common functionality between CodegenNeuronCppVisitor and CodegenCoreneuronCppVisitor

* Rearrange functions in CodegenCoreneuronCppVisitor to match CodegenNeuronCppVisitor and CodegenCppVisitor

* Added unit test for the code generated for NEURON at the moment

* Introduce CLI options for NEURON code generation and removed the references to C

src/codegen/CMakeLists.txt

@@ -5,6 +5,8 @@ add_library(
   codegen STATIC
   codegen_acc_visitor.cpp
   codegen_transform_visitor.cpp
+  codegen_coreneuron_cpp_visitor.cpp
+  codegen_neuron_cpp_visitor.cpp
   codegen_cpp_visitor.cpp
   codegen_compatibility_visitor.cpp
   codegen_helper_visitor.cpp

src/codegen/codegen_acc_visitor.cpp

@@ -84,7 +84,7 @@ std::string CodegenAccVisitor::backend_name() const {
 void CodegenAccVisitor::print_memory_allocation_routine() const {
     // memory for artificial cells should be allocated on CPU
     if (info.artificial_cell) {
-        CodegenCppVisitor::print_memory_allocation_routine();
+        CodegenCoreneuronCppVisitor::print_memory_allocation_routine();
         return;
     }
     printer->add_newline(2);

src/codegen/codegen_acc_visitor.hpp

@@ -12,7 +12,7 @@
  * \brief \copybrief nmodl::codegen::CodegenAccVisitor
  */
 
-#include "codegen/codegen_cpp_visitor.hpp"
+#include "codegen/codegen_coreneuron_cpp_visitor.hpp"
 
 
 namespace nmodl {
@@ -27,7 +27,7 @@ namespace codegen {
  * \class CodegenAccVisitor
  * \brief %Visitor for printing C++ code with OpenACC backend
  */
-class CodegenAccVisitor: public CodegenCppVisitor {
+class CodegenAccVisitor: public CodegenCoreneuronCppVisitor {
   protected:
     /// name of the code generation backend
     std::string backend_name() const override;
@@ -140,13 +140,13 @@ class CodegenAccVisitor: public CodegenCppVisitor {
                       const std::string& output_dir,
                       const std::string& float_type,
                       bool optimize_ionvar_copies)
-        : CodegenCppVisitor(mod_file, output_dir, float_type, optimize_ionvar_copies) {}
+        : CodegenCoreneuronCppVisitor(mod_file, output_dir, float_type, optimize_ionvar_copies) {}
 
     CodegenAccVisitor(const std::string& mod_file,
                       std::ostream& stream,
                       const std::string& float_type,
                       bool optimize_ionvar_copies)
-        : CodegenCppVisitor(mod_file, stream, float_type, optimize_ionvar_copies) {}
+        : CodegenCoreneuronCppVisitor(mod_file, stream, float_type, optimize_ionvar_copies) {}
 };
 
 /** \} */  // end of codegen_backends