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"
17 using namespace llvm;
18 
19 // Create the combined function index/summary from multiple
20 // per-module instances.
mergeFrom(std::unique_ptr<FunctionInfoIndex> Other,uint64_t NextModuleId)21 void 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