Add an ABI-stable libfunctionNameDemangle library, which enables external

clients to use the Swift demangler without depending on compiler internals.


Swift SVN r14776

lib/FunctionNameDemangle/FunctionNameDemangle.cpp

@@ -0,0 +1,46 @@
+//===-- FunctionNameDemangle.cpp - Public demangling interface-------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+//
+// Functions in the libfunctionNameDemangle library, which provides external
+// access to Swift's internal demangling functionality.
+//
+//===----------------------------------------------------------------------===//
+
+#include <swift/Basic/Demangle.h>
+#include <swift/FunctionNameDemangle/FunctionNameDemangle.h>
+
+/// \returns true if \p MangledName starts with Swift prefix, "_T".
+static bool isSwiftPrefixed(const char *MangledName) {
+  return (MangledName[0] == '_' && MangledName[1] == 'T');
+}
+
+size_t fnd_get_demangled_name(const char *MangledName, char *OutputBuffer,
+                              size_t Length) {
+  assert(MangledName != nullptr && "null input");
+  assert(OutputBuffer != nullptr || Length == 0);
+
+  if (!isSwiftPrefixed(MangledName))
+    return 0; // Not a mangled name
+
+  swift::Demangle::DemangleOptions DemangleOptions;
+  DemangleOptions.SynthesizeSugarOnTypes = true;
+
+  std::string Result =
+      swift::Demangle::demangleSymbolAsString(MangledName, DemangleOptions);
+
+  if (Result == MangledName)
+    return 0; // Not a mangled name
+
+  // Copy the result to an output buffer.
+  return strlcpy(OutputBuffer, Result.c_str(), Length);
+}
+