C++ Insights: Peek behind the curtains of your C++ compiler
summary
C++ Insights is a clang AST-based, open‑source tool that performs source‑to‑source transforms so the compiler’s hidden work appears as valid C++ code. It makes default parameters visible (showing three separate std::string allocations in an example), exposes padding and cache effects (a reorder shrinks a struct to 64 bytes and drops runtime from ~1.9 ms), and provides object lifetime visualization including coroutine frame rewrites and where temporaries dangle. It uses clang front end, has hand‑rolled transforms for coroutines, and runs locally via Docker.
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chapters (15)
- 0:00Introduction
- 1:20C++ Insights overview
- 3:58Technical architecture
- 11:39Handling templates
- 14:35Abstract Syntax Tree
- 16:57Transformation types
- 20:32Default parameters
- 23:58Padding and alignment
- 29:16Object lifetime
- 36:02Advanced lifetime analysis
- 45:35C++ 20 aggregate initialization
- 49:55Reference parameters
- 50:52Coroutines
- 53:21Explicit object parameters
- 56:56Conclusion and Q&A
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