1 files changed, 67 insertions, 0 deletions
diff --git a/contrib/llvm/lib/IR/FunctionInfo.cpp b/contrib/llvm/lib/IR/FunctionInfo.cpp
new file mode 100644
index 000000000000..17a67bcf0472
--- /dev/null
+++ b/contrib/llvm/lib/IR/FunctionInfo.cpp
@@ -0,0 +1,67 @@
+//===-- FunctionInfo.cpp - Function Info Index ----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the function info index and summary classes for the
+// IR library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/FunctionInfo.h"
+#include "llvm/ADT/StringMap.h"
+using namespace llvm;
+
+// Create the combined function index/summary from multiple
+// per-module instances.
+void FunctionInfoIndex::mergeFrom(std::unique_ptr<FunctionInfoIndex> Other,
+                                  uint64_t NextModuleId) {
+
+  StringRef ModPath;
+  for (auto &OtherFuncInfoLists : *Other) {
+    std::string FuncName = OtherFuncInfoLists.getKey();
+    FunctionInfoList &List = OtherFuncInfoLists.second;
+
+    // Assert that the func info list only has one entry, since we shouldn't
+    // have duplicate names within a single per-module index.
+    assert(List.size() == 1);
+    std::unique_ptr<FunctionInfo> Info = std::move(List.front());
+
+    // Skip if there was no function summary section.
+    if (!Info->functionSummary())
+      continue;
+
+    // Add the module path string ref for this module if we haven't already
+    // saved a reference to it.
+    if (ModPath.empty())
+      ModPath =
+          addModulePath(Info->functionSummary()->modulePath(), NextModuleId);
+    else
+      assert(ModPath == Info->functionSummary()->modulePath() &&
+             "Each module in the combined map should have a unique ID");
+
+    // Note the module path string ref was copied above and is still owned by
+    // the original per-module index. Reset it to the new module path
+    // string reference owned by the combined index.
+    Info->functionSummary()->setModulePath(ModPath);
+
+    // If it is a local function, rename it.
+    if (Info->functionSummary()->isLocalFunction()) {
+      // Any local functions are virtually renamed when being added to the
+      // combined index map, to disambiguate from other functions with
+      // the same name. The symbol table created for the combined index
+      // file should contain the renamed symbols.
+      FuncName =
+          FunctionInfoIndex::getGlobalNameForLocal(FuncName, NextModuleId);
+    }
+
+    // Add new function info to existing list. There may be duplicates when
+    // combining FunctionMap entries, due to COMDAT functions. Any local
+    // functions were virtually renamed above.
+    addFunctionInfo(FuncName, std::move(Info));
+  }
+}