Question

SV Side:

// Declare an imported context sensitive C function with cname "MyCFunc"
import "DPI" context MyCFunc = function integer MapID(int portID);

C Side:

// Define the function and model class on the C++ side:
class MyCModel {
private:
int locallyMapped(int portID); // Does something interesting...
public:
// Constructor
MyCModel(const char* instancePath) {
svScope svScope = svGetScopeByName(instancePath);
// Associate "this" with the corresponding SystemVerilog scope
// for fast retrieval during runtime.
svPutUserData(svScope, (void*) MyCFunc, this);
}
friend int MyCFunc(int portID);
};
// Implementation of imported context function callable in SV
int MyCFunc(int portID) {
// Retrieve SV instance scope (i.e. this function’s context).
svScope = svGetScope();
// Retrieve and make use of user data stored in SV scope
MyCModel* me = (MyCModel*)svGetUserData(svScope, (void*) MyCFunc);
return me->locallyMapped(portID);
}