[clang][dataflow] Move NoopAnalysis from unittests to include

This patch moves `Analysis/FlowSensitive/NoopAnalysis.h` from `clang/unittests/` to `clang/include/clang/`, so that we can use it for doing context-sensitive analysis.

Reviewed By: ymandel, gribozavr2, sgatev

Differential Revision: https://reviews.llvm.org/D130304

1 files changed, 43 insertions, 0 deletions

diff --git a/clang/include/clang/Analysis/FlowSensitive/NoopAnalysis.h b/clang/include/clang/Analysis/FlowSensitive/NoopAnalysis.h
new file mode 100644
index 0000000..15b7221
--- /dev/null
+++ b/clang/include/clang/Analysis/FlowSensitive/NoopAnalysis.h
@@ -0,0 +1,43 @@
+//===-- NoopAnalysis.h ------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines a NoopAnalysis class that just uses the builtin transfer.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_NOOPANALYSIS_H
+#define LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_NOOPANALYSIS_H
+
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Stmt.h"
+#include "clang/Analysis/FlowSensitive/DataflowAnalysis.h"
+#include "clang/Analysis/FlowSensitive/DataflowEnvironment.h"
+#include "clang/Analysis/FlowSensitive/NoopLattice.h"
+
+namespace clang {
+namespace dataflow {
+
+class NoopAnalysis : public DataflowAnalysis<NoopAnalysis, NoopLattice> {
+public:
+  /// `ApplyBuiltinTransfer` controls whether to run the built-in transfer
+  /// functions that model memory during the analysis. Their results are not
+  /// used by `NoopAnalysis`, but tests that need to inspect the environment
+  /// should enable them.
+  NoopAnalysis(ASTContext &Context, bool ApplyBuiltinTransfer)
+      : DataflowAnalysis<NoopAnalysis, NoopLattice>(Context,
+                                                    ApplyBuiltinTransfer) {}
+
+  static NoopLattice initialElement() { return {}; }
+
+  void transfer(const Stmt *S, NoopLattice &E, Environment &Env) {}
+};
+
+} // namespace dataflow
+} // namespace clang
+
+#endif // LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_NOOPANALYSIS_H