[PATCH] D13973: CFG: Delay creating Dtors for CompoundStmts which end in ReturnStmt

[Matthias Gehre via cfe-commits]

mgehre updated this revision to Diff 38359.
mgehre added a comment.

Update for review comments


http://reviews.llvm.org/D13973

Files:
  lib/Analysis/CFG.cpp
  test/Analysis/no-unreachable-dtors.cpp

Index: test/Analysis/no-unreachable-dtors.cpp
===================================================================
--- /dev/null
+++ test/Analysis/no-unreachable-dtors.cpp
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -analyze -analyzer-checker=debug.Stats -verify -Wno-unreachable-code %s
+
+struct S {
+  ~S();
+};
+
+// the return at the end of an CompoundStmt does not lead to an unreachable block containing the dtors
+void test() { // expected-warning-re{{test -> Total CFGBlocks: {{[0-9]+}} | Unreachable CFGBlocks: 0 | Exhausted Block: no | Empty WorkList: yes}}
+  S s;
+  return;
+}
Index: lib/Analysis/CFG.cpp
===================================================================
--- lib/Analysis/CFG.cpp
+++ lib/Analysis/CFG.cpp
@@ -1942,7 +1942,15 @@
 
 
 CFGBlock *CFGBuilder::VisitCompoundStmt(CompoundStmt *C) {
-  addLocalScopeAndDtors(C);
+  LocalScope::const_iterator scopeBeginPos = ScopePos;
+  if (BuildOpts.AddImplicitDtors) {
+    addLocalScopeForStmt(C);
+  }
+  if (!C->body_empty() && !isa<ReturnStmt>(*C->body_rbegin())) {
+    // If the body ends with a ReturnStmt, the dtors will be added in VisitReturnStmt
+    addAutomaticObjDtors(ScopePos, scopeBeginPos, C);
+  }
+
   CFGBlock *LastBlock = Block;
 
   for (CompoundStmt::reverse_body_iterator I=C->body_rbegin(), E=C->body_rend();


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