cmd/compile: intercept string compares in libFuzzer mode IR string compares as well as calls to string comparison functions such as `strings.EqualFold` are intercepted and the corresponding libFuzzer callbacks are invoked with the corresponding arguments. As a result, the compared strings will be added to libFuzzer’s table of recent compares, which feeds future mutations performed by the fuzzer and thus allow it to reach into branches guarded by string comparisons. The list of methods to intercept is maintained in `cmd/compile/internal/walk/expr.go` and can easily be extended to cover more standard library functions in the future. Change-Id: I5c8b89499c4e19459406795dea923bf777779c51 GitHub-Last-Rev: 6b8529b55561faf57ea59cb7cff1caf8c9c94ecd GitHub-Pull-Request: golang/go#51319 Reviewed-on: https://go-review.googlesource.com/c/go/+/387335 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Keith Randall <khr@google.com> Run-TryBot: Keith Randall <khr@golang.org>
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