1 files changed, 55 insertions, 0 deletions
diff --git a/llvm/utils/TableGen/GlobalISel/CodeExpander.h b/llvm/utils/TableGen/GlobalISel/CodeExpander.h
new file mode 100644
index 000000000000..bd6946de5925
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+++ b/llvm/utils/TableGen/GlobalISel/CodeExpander.h
@@ -0,0 +1,55 @@
+//===- CodeExpander.h - Expand variables in a string ----------------------===//
+//
+// 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 Expand the variables in a string.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_UTILS_TABLEGEN_CODEEXPANDER_H
+#define LLVM_UTILS_TABLEGEN_CODEEXPANDER_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/SMLoc.h"
+
+namespace llvm {
+class CodeExpansions;
+class raw_ostream;
+
+/// Emit the given code with all '${foo}' placeholders expanded to their
+/// replacements.
+///
+/// It's an error to use an undefined expansion and expansion-like output that
+/// needs to be emitted verbatim can be escaped as '\${foo}'
+///
+/// The emitted code can be given a custom indent to enable both indentation by
+/// an arbitrary amount of whitespace and emission of the code as a comment.
+class CodeExpander {
+  StringRef Code;
+  const CodeExpansions &Expansions;
+  const ArrayRef<SMLoc> &Loc;
+  bool ShowExpansions;
+  StringRef Indent;
+
+public:
+  CodeExpander(StringRef Code, const CodeExpansions &Expansions,
+               const ArrayRef<SMLoc> &Loc, bool ShowExpansions,
+               StringRef Indent = "    ")
+      : Code(Code), Expansions(Expansions), Loc(Loc),
+        ShowExpansions(ShowExpansions), Indent(Indent) {}
+
+  void emit(raw_ostream &OS) const;
+};
+
+inline raw_ostream &operator<<(raw_ostream &OS, const CodeExpander &Expander) {
+  Expander.emit(OS);
+  return OS;
+}
+} // end namespace llvm
+
+#endif // ifndef LLVM_UTILS_TABLEGEN_CODEEXPANDER_H