Move the llvm mangler to lib/IR.

This makes it available to tools that don't link with target (like llvm-ar).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198708 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/Mangler.h

@@ -0,0 +1,65 @@
+//===-- llvm/IR/Mangler.h - Self-contained name mangler ---------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Unified name mangler for various backends.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TARGET_MANGLER_H
+#define LLVM_TARGET_MANGLER_H
+
+#include "llvm/ADT/DenseMap.h"
+
+namespace llvm {
+
+class DataLayout;
+class GlobalValue;
+class MCContext;
+template <typename T> class SmallVectorImpl;
+class Twine;
+
+class Mangler {
+public:
+  enum ManglerPrefixTy {
+    Default,               ///< Emit default string before each symbol.
+    Private,               ///< Emit "private" prefix before each symbol.
+    LinkerPrivate          ///< Emit "linker private" prefix before each symbol.
+  };
+
+private:
+  const DataLayout *DL;
+
+  /// AnonGlobalIDs - We need to give global values the same name every time
+  /// they are mangled.  This keeps track of the number we give to anonymous
+  /// ones.
+  ///
+  DenseMap<const GlobalValue*, unsigned> AnonGlobalIDs;
+
+  /// NextAnonGlobalID - This simple counter is used to unique value names.
+  ///
+  unsigned NextAnonGlobalID;
+
+public:
+  Mangler(const DataLayout *DL) : DL(DL), NextAnonGlobalID(1) {}
+
+  /// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
+  /// and the specified global variable's name.  If the global variable doesn't
+  /// have a name, this fills in a unique name for the global.
+  void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV);
+
+  /// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
+  /// and the specified name as the global variable name.  GVName must not be
+  /// empty.
+  void getNameWithPrefix(SmallVectorImpl<char> &OutName, const Twine &GVName,
+                         ManglerPrefixTy PrefixTy = Mangler::Default);
+};
+
+} // End llvm namespace
+
+#endif // LLVM_TARGET_MANGLER_H