Compiler Correctness and Input/Output

We describe the formal machine-checked verification of a compiler from a subset of the Vista structured assembly language to the flat assembly language Visa. In particular, we describe the problems associated with input and output commands. We present an oracle based model of I/O. We show how this model can be incorporated into both the relational semantics of Vista and the interpreter semantics of Visa. We illustrate how the compiler correctness theorem proved is sufficient to deduce correctness properties of compiled code from properties of the original program.

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