FunctionInfo.cpp revision 296417 
1//===-- FunctionInfo.cpp - Function Info Index ----------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the function info index and summary classes for the
11// IR library.
12//
13//===----------------------------------------------------------------------===//
14
15#include "llvm/IR/FunctionInfo.h"
16#include "llvm/ADT/StringMap.h"
17using namespace llvm;
18
19// Create the combined function index/summary from multiple
20// per-module instances.
21void FunctionInfoIndex::mergeFrom(std::unique_ptr<FunctionInfoIndex> Other,
22                                  uint64_t NextModuleId) {
23
24  StringRef ModPath;
25  for (auto &OtherFuncInfoLists : *Other) {
26    std::string FuncName = OtherFuncInfoLists.getKey();
27    FunctionInfoList &List = OtherFuncInfoLists.second;
28
29    // Assert that the func info list only has one entry, since we shouldn't
30    // have duplicate names within a single per-module index.
31    assert(List.size() == 1);
32    std::unique_ptr<FunctionInfo> Info = std::move(List.front());
33
34    // Skip if there was no function summary section.
35    if (!Info->functionSummary())
36      continue;
37
38    // Add the module path string ref for this module if we haven't already
39    // saved a reference to it.
40    if (ModPath.empty())
41      ModPath =
42          addModulePath(Info->functionSummary()->modulePath(), NextModuleId);
43    else
44      assert(ModPath == Info->functionSummary()->modulePath() &&
45             "Each module in the combined map should have a unique ID");
46
47    // Note the module path string ref was copied above and is still owned by
48    // the original per-module index. Reset it to the new module path
49    // string reference owned by the combined index.
50    Info->functionSummary()->setModulePath(ModPath);
51
52    // If it is a local function, rename it.
53    if (Info->functionSummary()->isLocalFunction()) {
54      // Any local functions are virtually renamed when being added to the
55      // combined index map, to disambiguate from other functions with
56      // the same name. The symbol table created for the combined index
57      // file should contain the renamed symbols.
58      FuncName =
59          FunctionInfoIndex::getGlobalNameForLocal(FuncName, NextModuleId);
60    }
61
62    // Add new function info to existing list. There may be duplicates when
63    // combining FunctionMap entries, due to COMDAT functions. Any local
64    // functions were virtually renamed above.
65    addFunctionInfo(FuncName, std::move(Info));
66  }
67}
68