[Coverage] Fix crash on a switch partially covered by a macro (PR27948)

We have to handle file exits before and after visiting regions in the
switch body. Fixes PR27948.

llvm-svn: 271308

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/test/CoverageMapping/switchmacro.c b/clang/test/CoverageMapping/switchmacro.c
index f2943b8ae44..f83d26fd168 100644
--- a/clang/test/CoverageMapping/switchmacro.c
+++ b/clang/test/CoverageMapping/switchmacro.c
@@ -32,6 +32,14 @@ default: ;
   END
 }
 
+// PR27948 - Crash when handling a switch partially covered by a macro
+// CHECK: baz
+#define START2 switch (0) default:
+void baz() {
+  for (;;)
+    START2 return; // CHECK: Expansion,File 0, [[@LINE]]:5 -> [[@LINE]]:11 = #1 (Expanded file = 1)
+}
+
 int main(int argc, const char *argv[]) {
   foo(3);
   return 0;