Implement jump checking for initialized c++ variables, implementing

a fixme and PR6451.

Only perform jump checking if the containing function has no errors,
and add the infrastructure needed to do this.

On the testcase in the PR, we produce:

t.cc:6:3: error: illegal goto into protected scope
  goto later;
  ^
t.cc:7:5: note: jump bypasses variable initialization
  X x;
    ^



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@97497 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index 38c842eede..fb7d1991fb 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -127,6 +127,8 @@ Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
   if (getLangOptions().CPlusPlus)
     FieldCollector.reset(new CXXFieldCollector());
 
+  NumErrorsAtStartOfFunction = 0;
+  
   // Tell diagnostics how to render things from the AST library.
   PP.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument, 
                                        &Context);