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Course contents

  • How to Use This Puzzle Bank
  • SystemVerilog Language Puzzles25
  • Difficulty Guide
  • Full Topic Map
  • Interview-Day Tips
  • Study Route: One Week Before the Interview
  • Study Route: Two Weeks
  • Study Route: Four Weeks (Full Course)4
  • OOP & Testbench Puzzles25
    • Handle and Copy Puzzles
    • Virtual Method Puzzles
    • Parameterized Class Puzzles
    • Factory Override Puzzles
    • OOP & Testbench Puzzles: Tricky Q&A
  • Concurrency & Timing Puzzles25
  • Randomization & Constraint Puzzles25
  • SVA Assertion Puzzles25
  • Functional Coverage Puzzles25
  • Logic & Aptitude Puzzles25
  • Scenario & Debug Puzzles25
  • UVM Testbench Puzzles25
  • Clock, Reset & CDC Puzzles25
  • Bus and Interface Protocol Puzzles25
  • Interview Prep: Puzzle Rounds7
  • DV Puzzle Cheatsheet
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←DV Interview Puzzles
  1. Topics
  2. DV Interview Puzzles
  3. OOP & Testbench Puzzles
On this page

    VLSI DV Interview PuzzlesAll levels

    OOP & Testbench Puzzles

    Interview-style SystemVerilog/UVM OOP puzzles focused on bugs that appear in real verification code, not classroom examples. The set drills deep-copy correctness, dispatch semantics through base handles, parameterized-class specialization behavior, and exact UVM factory override resolution. Each topic is designed for board-style interviews where you must predict behavior and justify it quickly.

    • 5topics
    • 25lessons

    Topics in this section

    1. 1Handle and Copy Puzzles6 lessons
      • Shallow Copy in Nested Payload
      • Queue of Handle Cells Still Aliases
      • Analysis Port Lifetime Reuse
      • Null Handle During Partial Deep Copy
      • Handle Equality vs Content Equality
      • Clone Without Overridden do_copy
    2. 2Virtual Method Puzzles6 lessons
      • Non-Virtual vs Virtual Through Base Handle
      • Missing super.new with Required Base Args
      • Virtual Call from Base Constructor
      • Same Name, Different Prototype: Hiding Not Overriding
      • Template Method with Non-Virtual Wrapper
      • super Method Call in Override Chain
    3. 3Parameterized Class Puzzles6 lessons
      • Global Static vs Per-Specialization Static
      • Same Specialization via typedef Alias
      • $cast Between Specializations via a Common Base
      • Unrelated Specializations Cannot Be Assigned
      • Static Function Counters Per Specialization
      • Wrong UVM Macro for Parameterized Object
    4. 4Factory Override Puzzles6 lessons
      • Type Override vs Instance Override Precedence
      • Chained Type Overrides
      • Replace Flag in Repeated set_type_override
      • Overlapping Instance Overrides: First Match Wins
      • Component Override in build_phase
      • Override Timing Relative to create Calls
    5. 5OOP & Testbench Puzzles: Tricky Q&A1 lesson

    What this section covers

    Interview-style SystemVerilog/UVM OOP puzzles focused on bugs that appear in real verification code, not classroom examples. The set drills deep-copy correctness, dispatch semantics through base handles, parameterized-class specialization behavior, and exact UVM factory override resolution. Each topic is designed for board-style interviews where you must predict behavior and justify it quickly.

    Topics

    Diagram
    Handle and Copy Puzzles — 6 puzzles
    Virtual Method Puzzles — 6 puzzles
    Parameterized Class Puzzles — 6 puzzles
    Factory Override Puzzles — 6 puzzles

    How to practice

    1. Open each topic and attempt every puzzle cold, writing your predicted answer first.

    2. Only then read the step-by-step solution and confirm the exact answer.

    3. Re-read the 'why candidates get it wrong' note — that is the actual interview signal.

    4. Finish with the section Q&A to rehearse explaining the rule out loud.

    Related topics

    • VLSI DV Interview Puzzles hub

    PreviousNext: Handle and Copy Puzzles

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    See also

    • How to Use This Puzzle Bank
    • SystemVerilog Language Puzzles
    • Difficulty Guide