Compilers and Interpreters — Senior¶

Compiler correctness includes diagnostics, source maps, debug information, linking, incremental builds, and reproducibility. JITs speculate from profiles and must deoptimize safely when guards fail. A production regression can come from changed inlining, code-cache pressure, warmup, or an optimization blocked by aliasing.

Use optimization remarks, disassembly, profiles, and differential tests. Never infer generated behavior from source aesthetics.

Test yourself¶

1. What state must deoptimization reconstruct?
2. Why can inlining increase code size and hurt caches?
3. How would you isolate a compiler-version regression?

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