[cfe-commits] r102696 - in /cfe/trunk: lib/Sema/AnalysisBasedWarnings.cpp test/SemaCXX/warn-missing-noreturn.cpp

[John McCall]

Author: rjmccall
Date: Fri Apr 30 02:10:06 2010
New Revision: 102696

URL: http://llvm.org/viewvc/llvm-project?rev=102696&view=rev
Log:
An edge from a call expression to the exit block is only an abnormal edge
if *none* of the successors of the call expression is the exit block.
This matters when a call of bool type is the condition of (say) a while
loop in a function with no statements after the loop.  This *can* happen
in C, but it's much more common in C++ because of overloaded operators.

Suppresses some substantial number of spurious -Wmissing-noreturn warnings.


Modified:
    cfe/trunk/lib/Sema/AnalysisBasedWarnings.cpp
    cfe/trunk/test/SemaCXX/warn-missing-noreturn.cpp

Modified: cfe/trunk/lib/Sema/AnalysisBasedWarnings.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/AnalysisBasedWarnings.cpp?rev=102696&r1=102695&r2=102696&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/AnalysisBasedWarnings.cpp (original)
+++ cfe/trunk/lib/Sema/AnalysisBasedWarnings.cpp Fri Apr 30 02:10:06 2010
@@ -147,7 +147,8 @@
 
     bool NoReturnEdge = false;
     if (CallExpr *C = dyn_cast<CallExpr>(S)) {
-      if (B.succ_begin()[0] != &cfg->getExit()) {
+      if (std::find(B.succ_begin(), B.succ_end(), &cfg->getExit())
+            == B.succ_end()) {
         HasAbnormalEdge = true;
         continue;
       }

Modified: cfe/trunk/test/SemaCXX/warn-missing-noreturn.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/warn-missing-noreturn.cpp?rev=102696&r1=102695&r2=102696&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/warn-missing-noreturn.cpp (original)
+++ cfe/trunk/test/SemaCXX/warn-missing-noreturn.cpp Fri Apr 30 02:10:06 2010
@@ -27,3 +27,12 @@
 struct X {
   virtual void g() { f(); }
 };
+
+namespace test1 {
+  bool condition();
+
+  // We don't want a warning here.
+  void foo() {
+    while (condition()) {}
+  }
+}