From: Ted Kremenek <kremenek@apple.com>
Date: Wed, 1 Apr 2009 03:52:47 +0000 (+0000)
Subject: CFG: For 'if(...) {}' (empty body) construct an empty CFGBlock so that we can
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=dbdf7949a7a50f5a65055a3e95f6432ecc541056;p=clang

CFG: For 'if(...) {}' (empty body) construct an empty CFGBlock so that we can
distinguish between the true and false branches for path-sensitive analyses.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68185 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/AST/CFG.cpp b/lib/AST/CFG.cpp
index fc893d5b64..cd07aacbff 100644
--- a/lib/AST/CFG.cpp
+++ b/lib/AST/CFG.cpp
@@ -605,8 +605,13 @@ CFGBlock* CFGBuilder::VisitIfStmt(IfStmt* I) {
     Block = NULL;        
     ThenBlock = Visit(Then);
     
-    if (!ThenBlock) // Can occur when the Then body has all NullStmts.
-      ThenBlock = sv.get();
+    if (!ThenBlock) {
+      // We can reach here if the "then" body has all NullStmts.
+      // Create an empty block so we can distinguish between true and false
+      // branches in path-sensitive analyses.
+      ThenBlock = createBlock(false);
+      ThenBlock->addSuccessor(sv.get());
+    }
     else if (Block)
       FinishBlock(ThenBlock);
   }