[cfe-dev] Reporting a bug found at EndPath at its correct location

[YuvalShahar]

I am trying to solve a problem LIKE "unused variables": A symbol is assigned
a value and the value is never used.

For such a problem I need to track:
  Assignments: mark LHS as "assigned a value".
  Statements: for each symbol used in the expression, remove its "assigned a
value" property.
  EndPath: report each symbol that is marked "assigned a value".

The problem is that the report appears at the end of the path and not at the
point of the assignment.

On attempting to solve this problem I tried:
  Assignments: mark LHS as "assigned a value"; attach an ExplodedNode
marking the assignment location.
  Statements: for each symbol used in the expression, remove its "assigned a
value" property.
  EndPath: report each symbol that is marked "assigned a value", using the
previously attached ExplodedNode.

I would like to hear your opinions about these reporting scheme:
- Would this scheme work?
- Is it expensive in memory?
- Is there a preferred scheme?

Thanks.




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