1 //===- StringEntryToDwarfStringPoolEntryMap.h -------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef LLVM_LIB_DWARFLINKER_PARALLEL_STRINGENTRYTODWARFSTRINGPOOLENTRYMAP_H
10 #define LLVM_LIB_DWARFLINKER_PARALLEL_STRINGENTRYTODWARFSTRINGPOOLENTRYMAP_H
11 
12 #include "DWARFLinkerGlobalData.h"
13 #include "llvm/ADT/SmallVector.h"
14 #include "llvm/DWARFLinker/StringPool.h"
15 
16 namespace llvm {
17 namespace dwarf_linker {
18 namespace parallel {
19 
20 /// This class creates a DwarfStringPoolEntry for the corresponding StringEntry.
21 class StringEntryToDwarfStringPoolEntryMap {
22 public:
23   StringEntryToDwarfStringPoolEntryMap(LinkingGlobalData &GlobalData)
24       : GlobalData(GlobalData) {}
25   ~StringEntryToDwarfStringPoolEntryMap() {}
26 
27   /// Create DwarfStringPoolEntry for specified StringEntry if necessary.
28   /// Initialize DwarfStringPoolEntry with initial values.
29   DwarfStringPoolEntryWithExtString *add(const StringEntry *String) {
30     DwarfStringPoolEntriesTy::iterator it = DwarfStringPoolEntries.find(String);
31 
32     if (it == DwarfStringPoolEntries.end()) {
33       DwarfStringPoolEntryWithExtString *DataPtr =
34           GlobalData.getAllocator()
35               .Allocate<DwarfStringPoolEntryWithExtString>();
36       DataPtr->String = GlobalData.translateString(String->getKey());
37       DataPtr->Index = DwarfStringPoolEntry::NotIndexed;
38       DataPtr->Offset = 0;
39       DataPtr->Symbol = nullptr;
40       it = DwarfStringPoolEntries.insert(std::make_pair(String, DataPtr)).first;
41     }
42 
43     assert(it->second != nullptr);
44     return it->second;
45   }
46 
47   /// Returns already existed DwarfStringPoolEntry for the specified
48   /// StringEntry.
49   DwarfStringPoolEntryWithExtString *
50   getExistingEntry(const StringEntry *String) const {
51     DwarfStringPoolEntriesTy::const_iterator it =
52         DwarfStringPoolEntries.find(String);
53 
54     assert(it != DwarfStringPoolEntries.end());
55     assert(it->second != nullptr);
56     return it->second;
57   }
58 
59   /// Erase contents of StringsForEmission.
60   void clear() { DwarfStringPoolEntries.clear(); }
61 
62 protected:
63   using DwarfStringPoolEntriesTy =
64       DenseMap<const StringEntry *, DwarfStringPoolEntryWithExtString *>;
65   DwarfStringPoolEntriesTy DwarfStringPoolEntries;
66 
67   LinkingGlobalData &GlobalData;
68 };
69 
70 } // end of namespace parallel
71 } // end of namespace dwarf_linker
72 } // end of namespace llvm
73 
74 #endif // LLVM_LIB_DWARFLINKER_PARALLEL_STRINGENTRYTODWARFSTRINGPOOLENTRYMAP_H
75