Added Delta IR Reduction Tool

Summary: Tool parses input IR file, and runs the delta debugging algorithm to reduce the functions inside the input file.

Reviewers: alexshap, chandlerc

Subscribers: mgorny, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63672

> llvm-svn: 368071

llvm-svn: 368112

1 files changed, 28 insertions, 0 deletions

diff --git a/llvm/tools/llvm-reduce/deltas/RemoveFunctions.h b/llvm/tools/llvm-reduce/deltas/RemoveFunctions.h
new file mode 100644
index 00000000000..3a6e501dc93
--- /dev/null
+++ b/llvm/tools/llvm-reduce/deltas/RemoveFunctions.h
@@ -0,0 +1,28 @@
+//===- llvm-reduce.cpp - The LLVM Delta Reduction utility -----------------===//
+//
+// 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 is a Specialized Delta Pass, which removes the functions that are
+// not in the provided function-chunks.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Delta.h"
+#include "llvm/Transforms/Utils/Cloning.h"
+
+namespace llvm {
+
+class RemoveFunctions {
+public:
+  /// Outputs the number of Functions in the given Module
+  static int getTargetCount(Module *Program);
+  /// Clones module and returns it with chunk functions only
+  static std::unique_ptr<Module>
+  extractChunksFromModule(std::vector<Chunk> ChunksToKeep, Module *Program);
+};
+
+} // namespace llvm