Fixes a crash during constant folding of a switch and case
statement which has an unscoped case inside it.
Patch by Aaron Ballman
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148243 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index 594281d..ee4a272 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -878,6 +878,16 @@
}
void CodeGenFunction::EmitCaseStmt(const CaseStmt &S) {
+ // If there is no enclosing switch instance that we're aware of, then this
+ // case statement and its block can be elided. This situation only happens
+ // when we've constant-folded the switch, are emitting the constant case,
+ // and part of the constant case includes another case statement. For
+ // instance: switch (4) { case 4: do { case 5: } while (1); }
+ if (!SwitchInsn) {
+ EmitStmt(S.getSubStmt());
+ return;
+ }
+
// Handle case ranges.
if (S.getRHS()) {
EmitCaseStmtRange(S);
