1 //===-- ModuleSummaryIndex.cpp - Module Summary 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 module index and summary classes for the
11 // IR library.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "llvm/IR/ModuleSummaryIndex.h"
16 #include "llvm/ADT/StringMap.h"
17 using namespace llvm;
18
19 // Create the combined module index/summary from multiple
20 // per-module instances.
mergeFrom(std::unique_ptr<ModuleSummaryIndex> Other,uint64_t NextModuleId)21 void ModuleSummaryIndex::mergeFrom(std::unique_ptr<ModuleSummaryIndex> Other,
22 uint64_t NextModuleId) {
23
24 StringRef ModPath;
25 for (auto &OtherGlobalValSummaryLists : *Other) {
26 GlobalValue::GUID ValueGUID = OtherGlobalValSummaryLists.first;
27 GlobalValueSummaryList &List = OtherGlobalValSummaryLists.second;
28
29 // Assert that the value summary 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<GlobalValueSummary> Summary = std::move(List.front());
33
34 // Add the module path string ref for this module if we haven't already
35 // saved a reference to it.
36 if (ModPath.empty()) {
37 auto Path = Summary->modulePath();
38 ModPath = addModulePath(Path, NextModuleId, Other->getModuleHash(Path))
39 ->first();
40 } else
41 assert(ModPath == Summary->modulePath() &&
42 "Each module in the combined map should have a unique ID");
43
44 // Note the module path string ref was copied above and is still owned by
45 // the original per-module index. Reset it to the new module path
46 // string reference owned by the combined index.
47 Summary->setModulePath(ModPath);
48
49 // Add new value summary to existing list. There may be duplicates when
50 // combining GlobalValueMap entries, due to COMDAT values. Any local
51 // values were given unique global IDs.
52 addGlobalValueSummary(ValueGUID, std::move(Summary));
53 }
54 }
55
removeEmptySummaryEntries()56 void ModuleSummaryIndex::removeEmptySummaryEntries() {
57 for (auto MI = begin(), MIE = end(); MI != MIE;) {
58 // Only expect this to be called on a per-module index, which has a single
59 // entry per value entry list.
60 assert(MI->second.size() == 1);
61 if (!MI->second[0])
62 MI = GlobalValueMap.erase(MI);
63 else
64 ++MI;
65 }
66 }
67
68 // Collect for the given module the list of function it defines
69 // (GUID -> Summary).
collectDefinedFunctionsForModule(StringRef ModulePath,GVSummaryMapTy & GVSummaryMap) const70 void ModuleSummaryIndex::collectDefinedFunctionsForModule(
71 StringRef ModulePath, GVSummaryMapTy &GVSummaryMap) const {
72 for (auto &GlobalList : *this) {
73 auto GUID = GlobalList.first;
74 for (auto &GlobSummary : GlobalList.second) {
75 auto *Summary = dyn_cast_or_null<FunctionSummary>(GlobSummary.get());
76 if (!Summary)
77 // Ignore global variable, focus on functions
78 continue;
79 // Ignore summaries from other modules.
80 if (Summary->modulePath() != ModulePath)
81 continue;
82 GVSummaryMap[GUID] = Summary;
83 }
84 }
85 }
86
87 // Collect for each module the list of function it defines (GUID -> Summary).
collectDefinedGVSummariesPerModule(StringMap<GVSummaryMapTy> & ModuleToDefinedGVSummaries) const88 void ModuleSummaryIndex::collectDefinedGVSummariesPerModule(
89 StringMap<GVSummaryMapTy> &ModuleToDefinedGVSummaries) const {
90 for (auto &GlobalList : *this) {
91 auto GUID = GlobalList.first;
92 for (auto &Summary : GlobalList.second) {
93 ModuleToDefinedGVSummaries[Summary->modulePath()][GUID] = Summary.get();
94 }
95 }
96 }
97
98 GlobalValueSummary *
getGlobalValueSummary(uint64_t ValueGUID,bool PerModuleIndex) const99 ModuleSummaryIndex::getGlobalValueSummary(uint64_t ValueGUID,
100 bool PerModuleIndex) const {
101 auto SummaryList = findGlobalValueSummaryList(ValueGUID);
102 assert(SummaryList != end() && "GlobalValue not found in index");
103 assert((!PerModuleIndex || SummaryList->second.size() == 1) &&
104 "Expected a single entry per global value in per-module index");
105 auto &Summary = SummaryList->second[0];
106 return Summary.get();
107 }
108