[llvm-diff] Create libLLVMDiff library

Some tools may want to use the LLVM "diff" code. Move the code into a
library for easy use.

No functionality change intende.

Differential Revision: https://reviews.llvm.org/D107392

1 files changed, 83 insertions, 0 deletions

diff --git a/llvm/tools/llvm-diff/lib/DiffLog.h b/llvm/tools/llvm-diff/lib/DiffLog.h
new file mode 100644
index 0000000..d8b07b9
--- /dev/null
+++ b/llvm/tools/llvm-diff/lib/DiffLog.h
@@ -0,0 +1,83 @@
+//===-- DiffLog.h - Difference Log Builder and accessories ------*- 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 header defines the interface to the LLVM difference log builder.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_LLVM_DIFF_DIFFLOG_H
+#define LLVM_TOOLS_LLVM_DIFF_DIFFLOG_H
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace llvm {
+  class Instruction;
+  class Value;
+  class Consumer;
+
+  /// Trichotomy assumption
+  enum DiffChange { DC_match, DC_left, DC_right };
+
+  /// A temporary-object class for building up log messages.
+  class LogBuilder {
+    Consumer *consumer;
+
+    /// The use of a stored StringRef here is okay because
+    /// LogBuilder should be used only as a temporary, and as a
+    /// temporary it will be destructed before whatever temporary
+    /// might be initializing this format.
+    StringRef Format;
+
+    SmallVector<const Value *, 4> Arguments;
+
+  public:
+    LogBuilder(Consumer &c, StringRef Format) : consumer(&c), Format(Format) {}
+    LogBuilder(LogBuilder &&L)
+        : consumer(L.consumer), Format(L.Format),
+          Arguments(std::move(L.Arguments)) {
+      L.consumer = nullptr;
+    }
+
+    LogBuilder &operator<<(const Value *V) {
+      Arguments.push_back(V);
+      return *this;
+    }
+
+    ~LogBuilder();
+
+    StringRef getFormat() const;
+    unsigned getNumArguments() const;
+    const Value *getArgument(unsigned I) const;
+  };
+
+  /// A temporary-object class for building up diff messages.
+  class DiffLogBuilder {
+    typedef std::pair<const Instruction *, const Instruction *> DiffRecord;
+    SmallVector<DiffRecord, 20> Diff;
+
+    Consumer &consumer;
+
+  public:
+    DiffLogBuilder(Consumer &c) : consumer(c) {}
+    ~DiffLogBuilder();
+
+    void addMatch(const Instruction *L, const Instruction *R);
+    // HACK: VS 2010 has a bug in the stdlib that requires this.
+    void addLeft(const Instruction *L);
+    void addRight(const Instruction *R);
+
+    unsigned getNumLines() const;
+    DiffChange getLineKind(unsigned I) const;
+    const Instruction *getLeft(unsigned I) const;
+    const Instruction *getRight(unsigned I) const;
+  };
+
+}
+
+#endif