From f39e6a388aaa2f155b46c61e655784b2473218eb Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Tue, 25 Jan 2011 22:50:47 +0000
Subject: [PATCH] Fix regression in -Wreturn-type caused by not handling all
 CFGElement kinds.  While writing the test case, it turned out that
 return-noreturn.cpp wasn't actually testing anything since it has the wrong
 -W flag.  That uncovered another regression with the handling of destructors
 marked noreturn.  WIP.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@124238 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Sema/AnalysisBasedWarnings.cpp     | 15 +++------------
 test/SemaCXX/return-noreturn-XFAIL.cpp | 18 ++++++++++++++++++
 test/SemaCXX/return-noreturn.cpp       | 24 +++++++++---------------
 3 files changed, 30 insertions(+), 27 deletions(-)
 create mode 100644 test/SemaCXX/return-noreturn-XFAIL.cpp

diff --git a/lib/Sema/AnalysisBasedWarnings.cpp b/lib/Sema/AnalysisBasedWarnings.cpp
index 4866c8fb3d..2f02e158cb 100644
--- a/lib/Sema/AnalysisBasedWarnings.cpp
+++ b/lib/Sema/AnalysisBasedWarnings.cpp
@@ -132,21 +132,12 @@ static ControlFlowKind CheckFallThrough(AnalysisContext &AC) {
       continue;
     }
     CFGElement CE = B[B.size()-1];
-    if (CFGInitializer CI = CE.getAs<CFGInitializer>()) {
-      // A base or member initializer.
-      HasPlainEdge = true;
-      continue;
-    }
-    if (CFGMemberDtor MD = CE.getAs<CFGMemberDtor>()) {
-      // A member destructor.
-      HasPlainEdge = true;
-      continue;
-    }
-    if (CFGBaseDtor BD = CE.getAs<CFGBaseDtor>()) {
-      // A base destructor.
+    
+    if (!isa<CFGStmt>(CE)) {
       HasPlainEdge = true;
       continue;
     }
+
     CFGStmt CS = CE.getAs<CFGStmt>();
     if (!CS.isValid())
       continue;
diff --git a/test/SemaCXX/return-noreturn-XFAIL.cpp b/test/SemaCXX/return-noreturn-XFAIL.cpp
new file mode 100644
index 0000000000..ee76dcb270
--- /dev/null
+++ b/test/SemaCXX/return-noreturn-XFAIL.cpp
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 %s -fsyntax-only -verify -Wreturn-type -Wno-unreachable-code
+// XFAIL: *
+
+// A destructor may be marked noreturn and should still influence the CFG.
+namespace PR6884 {
+  struct abort_struct {
+    abort_struct() {} // Make this non-POD so the destructor is invoked.
+    ~abort_struct() __attribute__((noreturn));
+  };
+
+  int f() {
+    abort_struct();
+  }
+
+  int f2() {
+    abort_struct s;
+  }
+}
diff --git a/test/SemaCXX/return-noreturn.cpp b/test/SemaCXX/return-noreturn.cpp
index f7072b2177..5045d1b4c3 100644
--- a/test/SemaCXX/return-noreturn.cpp
+++ b/test/SemaCXX/return-noreturn.cpp
@@ -1,17 +1,11 @@
-// RUN: %clang_cc1 %s -fsyntax-only -verify -Wmissing-noreturn -Wno-unreachable-code
+// RUN: %clang_cc1 %s -fsyntax-only -verify -Wreturn-type -Wno-unreachable-code
 
-// A destructor may be marked noreturn and should still influence the CFG.
-namespace PR6884 {
-  struct abort_struct {
-    abort_struct() {} // Make this non-POD so the destructor is invoked.
-    ~abort_struct() __attribute__((noreturn));
-  };
+// <rdar://problem/8875247> - Properly handle CFGs with destructors.
+struct rdar8875247 {
+  ~rdar8875247 ();
+};
+void rdar8875247_aux();
 
-  int f() {
-    abort_struct();
-  }
-
-  int f2() {
-    abort_struct s;
-  }
-}
+int rdar8875247_test() {
+  rdar8875247 f;
+} // expected-warning{{control reaches end of non-void function}}
-- 
2.50.1