AliveToolkit/alive2

Health v2 · maintenance only

Adoption not part of the score

1162 stars · 159 forks observed · 2026-09-01

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Alive2 is a set of C++ libraries and tools for automatically verifying LLVM code and optimization transformations using symbolic execution and SMT solving. It provides translation validation plugins for clang and LLVM's opt, a standalone verifier (alive-tv), and a UB-precise LLVM IR interpreter.

Use cases

• verify that an LLVM optimization pass preserves semantics
• check compiler transformations for miscompilation bugs
• run translation validation while compiling C/C++ with clang
• interpret LLVM IR with precise undefined behavior detection
• fuzz-test LLVM passes for correctness
• validate IR refinements with an SMT solver

When to choose

• you are developing or testing LLVM optimization passes and need automatic correctness checking
• you want to catch miscompilations in compiler transformations before they ship
• you need a UB-precise interpreter for LLVM IR

When to avoid

• you need inter-procedural transformation verification, which Alive2 does not support
• you work with languages or IRs other than LLVM IR
• you need a lightweight tool without building LLVM and Z3 from source

Facets

library · maturity active

testing compiler interpreter developer-tools compilers developer-tools programming-languages windows cpp cli llvm translation-validation smt z3 symbolic-execution formal-verification llvm-ir optimization-verifier algorithms linux macos

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