--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/llvm-xray/func-id-helper.cpp	Wed Aug 14 19:46:37 2019 +0900
@@ -0,0 +1,75 @@
+//===- xray-fc-account.cpp: XRay Function Call Accounting Tool ------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Implementation of the helper tools dealing with XRay-generated function ids.
+//
+//===----------------------------------------------------------------------===//
+
+#include "func-id-helper.h"
+#include "llvm/Support/Path.h"
+#include <sstream>
+
+using namespace llvm;
+using namespace xray;
+
+std::string FuncIdConversionHelper::SymbolOrNumber(int32_t FuncId) const {
+  auto CacheIt = CachedNames.find(FuncId);
+  if (CacheIt != CachedNames.end())
+    return CacheIt->second;
+
+  std::ostringstream F;
+  auto It = FunctionAddresses.find(FuncId);
+  if (It == FunctionAddresses.end()) {
+    F << "#" << FuncId;
+    return F.str();
+  }
+
+  object::SectionedAddress ModuleAddress;
+  ModuleAddress.Address = It->second;
+  // TODO: set proper section index here.
+  // object::SectionedAddress::UndefSection works for only absolute addresses.
+  ModuleAddress.SectionIndex = object::SectionedAddress::UndefSection;
+  if (auto ResOrErr = Symbolizer.symbolizeCode(BinaryInstrMap, ModuleAddress)) {
+    auto &DI = *ResOrErr;
+    if (DI.FunctionName == "<invalid>")
+      F << "@(" << std::hex << It->second << ")";
+    else
+      F << DI.FunctionName;
+  } else
+    handleAllErrors(ResOrErr.takeError(), [&](const ErrorInfoBase &) {
+      F << "@(" << std::hex << It->second << ")";
+    });
+
+  auto S = F.str();
+  CachedNames[FuncId] = S;
+  return S;
+}
+
+std::string FuncIdConversionHelper::FileLineAndColumn(int32_t FuncId) const {
+  auto It = FunctionAddresses.find(FuncId);
+  if (It == FunctionAddresses.end())
+    return "(unknown)";
+
+  std::ostringstream F;
+  object::SectionedAddress ModuleAddress;
+  ModuleAddress.Address = It->second;
+  // TODO: set proper section index here.
+  // object::SectionedAddress::UndefSection works for only absolute addresses.
+  ModuleAddress.SectionIndex = object::SectionedAddress::UndefSection;
+  auto ResOrErr = Symbolizer.symbolizeCode(BinaryInstrMap, ModuleAddress);
+  if (!ResOrErr) {
+    consumeError(ResOrErr.takeError());
+    return "(unknown)";
+  }
+
+  auto &DI = *ResOrErr;
+  F << sys::path::filename(DI.FileName).str() << ":" << DI.Line << ":"
+    << DI.Column;
+
+  return F.str();
+}