DSDP/DD/DSF CodingCamp ExpressionServiceExcercise

Goals

• Populate contents of the variables view with local variables of the selected stack frame.
• Retrieve the sub-expressions of arrays and structs to show in Variable view.
• Enable evaluating of expressions that user types in the Expression view.

Existing Components

• Stack Service:
  • Interface: org.eclipse.dd.dsf.debug.service.IStack
  • MI Implementation: org.eclipse.dd.dsf.mi.service.MIStack
  • Existing functionality:
    • Retrieves list of all stack frames for a given execution context
    • Retrieves the list of function arguments for a given stack frame context
  • Missing functionality / Cleanup tasks
    • Retrieving the list of local variables for a given stack frame context
    • Simplify logic to retrieve argument data.
      • Get rid of isValid() and make the VariableDMData class immutable
    • Add tracing to the service

• Expression Service:
  • Interface: org.eclipse.dd.dsf.debug.service.IExpressions
  • MI Implementation: org.eclipse.dd.dsf.mi.service.ExpressionService
  • Existing functionality:
    • Provided implementation was written to the interface but never tested.
    • The expression service is correctly created and shutdown during the launch sequence
  • Missing functionality:
    • As mentioned above the implementation was never tested, so it's not reliable as a reference.
    • Existing implementation does not manage the variable objects created by GDB using the "-var-create" command. Therefore all GDB variable objects that are created are leaked.
    • The expression service needs to retrieve the variable value in the number format that is specified by the client.