[llvm-exegesis][NFC] Refactor snippet file reading out of tool main.

Summary: Add unit tests.

Reviewers: gchatelet

Subscribers: mgorny, tschuett, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68212

llvm-svn: 373202

1 files changed, 35 insertions, 0 deletions

diff --git a/llvm/tools/llvm-exegesis/lib/SnippetFile.h b/llvm/tools/llvm-exegesis/lib/SnippetFile.h
new file mode 100644
index 00000000000..e5ece91917f
--- /dev/null
+++ b/llvm/tools/llvm-exegesis/lib/SnippetFile.h
@@ -0,0 +1,35 @@
+//===-- SnippetFile.cpp -----------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Utilities to read a snippet file.
+/// Snippet files are just asm files with additional comments to specify which
+/// registers should be defined or are live on entry.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_LLVM_EXEGESIS_SNIPPETFILE_H
+#define LLVM_TOOLS_LLVM_EXEGESIS_SNIPPETFILE_H
+
+#include "BenchmarkCode.h"
+#include "LlvmState.h"
+#include "llvm/Support/Error.h"
+
+#include <vector>
+
+namespace llvm {
+namespace exegesis {
+
+// Reads code snippets from file `Filename`.
+Expected<std::vector<BenchmarkCode>> readSnippets(const LLVMState &State,
+                                                  StringRef Filename);
+
+} // namespace exegesis
+} // namespace llvm
+
+#endif
\ No newline at end of file