Development and Evaluation of LAV: An SMT-Based Error Finding ...
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Jan 28, 2012 - An SMT-Based Error Finding Platform. Milena VujoËsevic-Janicic and Viktor Kuncak. Verified Software, Theories, Tools and Experiments.
Development and Evaluation of LAV: An SMT-Based Error Finding Platform Milena Vujoˇ sevi´ c-Janiˇ ci´ c and Viktor Kunˇ cak Verified Software, Theories, Tools and Experiments Philadelphia, USA January 28-29, 2012.
Agenda • Motivation and short overview of LAV
• Modeling of programs
• Implementation and preliminary evaluation
• Conclusions
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Agenda • Motivation and a short overview of the system
• Modeling of programs
• Implementation and preliminary evaluation
• Conclusions
2
Motivation and a Short Overview of the System • LAV* is a bug-finding tool, it works on the LLVM low-level intermediate representation
• LAV combines symbolic execution, SAT encoding of program’s behavior and bounded model checking
• LAV generates correctness conditions that are passed to a suitable SMT solver *LLVM Automated Verifier 3
Motivation and a Short Overview of the System — Ex. 0: 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11:
int main() { int a0, a1, k, div = 1; if(a0>0) a0 = 1; else a0 = -1; if(a1>0) a1 = 1; else a1 = -1; div = a0+a1+2; k = 1/div; }
line 10: UNSAFE function: main error: division_by_zero 3: a0 == 0, a1 == 0, div == 1 5: a0 == -1, a1 == 0, div == 1 6: a0 == -1, a1 == 0, div == 1 8: a0 == -1, a1 == -1, div == 1 10: a0 == -1, a1 == -1, div == 0
C code example (left) and LAV output (right)
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Motivation and a Short Overview of the System — Ex. LAV bug in the last path 0.07 0.19 0.46 0.54 0.67
