extract the MD5Stream utility from IRGen to its own header file.

Author: eeckstein

include/swift/Basic/MD5Stream.h

@@ -0,0 +1,45 @@
+//===--- MD5Stream.h - raw_ostream that compute MD5  ------------*- C++ -*-===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2022 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SWIFT_MD5STREAM_H
+#define SWIFT_MD5STREAM_H
+
+#include "llvm/Support/MD5.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace swift {
+
+/// An output stream which calculates the MD5 hash of the streamed data.
+class MD5Stream : public llvm::raw_ostream {
+private:
+
+  uint64_t Pos = 0;
+  llvm::MD5 Hash;
+
+  void write_impl(const char *Ptr, size_t Size) override {
+    Hash.update(ArrayRef<uint8_t>(reinterpret_cast<const uint8_t *>(Ptr), Size));
+    Pos += Size;
+  }
+
+  uint64_t current_pos() const override { return Pos; }
+
+public:
+
+  void final(llvm::MD5::MD5Result &Result) {
+    flush();
+    Hash.final(Result);
+  }
+};
+
+} // namespace swift
+
+#endif

lib/IRGen/IRGen.cpp

@@ -27,6 +27,7 @@
 #include "swift/AST/TBDGenRequests.h"
 #include "swift/Basic/Defer.h"
 #include "swift/Basic/Dwarf.h"
+#include "swift/Basic/MD5Stream.h"
 #include "swift/Basic/Platform.h"
 #include "swift/Basic/Statistic.h"
 #include "swift/Basic/Version.h"
@@ -69,7 +70,6 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/FormattedStream.h"
-#include "llvm/Support/MD5.h"
 #include "llvm/Support/Mutex.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Target/TargetMachine.h"
@@ -376,30 +376,6 @@ void swift::performLLVMOptimizations(const IRGenOptions &Opts,
   }
 }
 
-namespace {
-/// An output stream which calculates the MD5 hash of the streamed data.
-class MD5Stream : public llvm::raw_ostream {
-private:
-
-  uint64_t Pos = 0;
-  llvm::MD5 Hash;
-
-  void write_impl(const char *Ptr, size_t Size) override {
-    Hash.update(ArrayRef<uint8_t>(reinterpret_cast<const uint8_t *>(Ptr), Size));
-    Pos += Size;
-  }
-
-  uint64_t current_pos() const override { return Pos; }
-
-public:
-
-  void final(MD5::MD5Result &Result) {
-    flush();
-    Hash.final(Result);
-  }
-};
-} // end anonymous namespace
-
 /// Computes the MD5 hash of the llvm \p Module including the compiler version
 /// and options which influence the compilation.
 static MD5::MD5Result getHashOfModule(const IRGenOptions &Opts,