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title
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2025-12-09 10:22:16
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The Xr0 Semantic Abstractor for C Xr0 – Semantic Abstraction for C Updates Theses Learn Try ‘The fact that a language originated in 1973 has required as little change as this one has in thirty years of heavy use is truly remarkable, and without parallels anywhere else in computer science or engineering.’ 1 Xr0 is a tool for proving that C programs are safe at compile time. It relies on semantic abstractions , which are programmer annotations that describe the safety properties of code: /* the ~ [] part tells Xr0 we're using the heap */ void * alloc1() ~ [ .alloc result; ] { return malloc(1); } $ 0v alloc1.x $ echo silence is golden /* error: this allocates but has no ~ [] */ void * leak1() { return malloc(1); } $ 0v leak1.x qed error: actual and alleged states differ Xr0 is currently focused on dealing with memory leaks, but in time we intend for it to give C programmers the same safety guarantees that most higher-level languages offer. Xr0 is C. Xr0 ad...
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