[Coverage] Push a new region when handling CXXTryStmts

Push a new region for the try block and propagate execution counts
through it. This ensures that catch statements get a region counter
distinct from the try block's counter.

llvm-svn: 273463

1 files changed, 6 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CoverageMappingGen.cpp b/clang/lib/CodeGen/CoverageMappingGen.cpp
index 12bad4b03f7..b56cd077c8b 100644
--- a/clang/lib/CodeGen/CoverageMappingGen.cpp
+++ b/clang/lib/CodeGen/CoverageMappingGen.cpp
@@ -867,7 +867,12 @@ struct CounterCoverageMappingBuilder
 
   void VisitCXXTryStmt(const CXXTryStmt *S) {
     extendRegion(S);
-    Visit(S->getTryBlock());
+    // Handle macros that generate the "try" but not the rest.
+    extendRegion(S->getTryBlock());
+
+    Counter ParentCount = getRegion().getCounter();
+    propagateCounts(ParentCount, S->getTryBlock());
+
     for (unsigned I = 0, E = S->getNumHandlers(); I < E; ++I)
       Visit(S->getHandler(I));