Refactor CFG-based warnings in Sema to be run by a worked object called AnalysisBasedWarnings.
This object controls when the warnings are executed, allowing the client code
in Sema to selectively disable warnings as needed.
Centralizing the logic for analysis-based warnings allows us to optimize
when and how they are run.
Along the way, remove the redundant logic for the 'check fall-through' warning
for blocks; now the same logic is used for both blocks and functions.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99085 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/AnalysisBasedWarnings.h b/lib/Sema/AnalysisBasedWarnings.h
new file mode 100644
index 0000000..39da1b1
--- /dev/null
+++ b/lib/Sema/AnalysisBasedWarnings.h
@@ -0,0 +1,35 @@
+//=- AnalysisBasedWarnings.h - Sema warnings based on libAnalysis -*- C++ -*-=//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines AnalysisBasedWarnings, a worker object used by Sema
+// that issues warnings based on dataflow-analysis.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SEMA_ANALYSIS_WARNINGS_H
+#define LLVM_CLANG_SEMA_ANALYSIS_WARNINGS_H
+
+namespace clang { namespace sema {
+
+class AnalysisBasedWarnings {
+ Sema &S;
+ // The warnings to run.
+ unsigned enableCheckFallThrough : 1;
+ unsigned enableCheckUnreachable : 1;
+
+public:
+
+ AnalysisBasedWarnings(Sema &s);
+ void IssueWarnings(const Decl *D, QualType BlockTy = QualType());
+
+ void disableCheckFallThrough() { enableCheckFallThrough = 0; }
+};
+
+}} // end namespace clang::sema
+
+#endif