Add a comment explaining why llvm_unreachable_internal doesn't call
the ErrorHandler callback.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79541 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/ErrorHandling.cpp b/lib/Support/ErrorHandling.cpp
index 3467fe7..dff4f03 100644
--- a/lib/Support/ErrorHandling.cpp
+++ b/lib/Support/ErrorHandling.cpp
@@ -58,6 +58,9 @@
void llvm_unreachable_internal(const char *msg, const char *file,
unsigned line) {
+ // This code intentionally doesn't call the ErrorHandler callback, because
+ // llvm_unreachable is intended to be used to indicate "impossible"
+ // situations, and not legitimate runtime errors.
if (msg)
errs() << msg << "\n";
errs() << "UNREACHABLE executed";