1 //===- llvm/CodeGen/DwarfStringPoolEntry.h - String pool entry --*- C++ -*-===//
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 #ifndef LLVM_CODEGEN_DWARFSTRINGPOOLENTRY_H
11 #define LLVM_CODEGEN_DWARFSTRINGPOOLENTRY_H
12 
13 #include "llvm/ADT/PointerIntPair.h"
14 #include "llvm/ADT/StringMap.h"
15 
16 namespace llvm {
17 
18 class MCSymbol;
19 
20 /// Data for a string pool entry.
21 struct DwarfStringPoolEntry {
22   static constexpr unsigned NotIndexed = -1;
23 
24   MCSymbol *Symbol;
25   unsigned Offset;
26   unsigned Index;
27 
isIndexedDwarfStringPoolEntry28   bool isIndexed() const { return Index != NotIndexed; }
29 };
30 
31 /// String pool entry reference.
32 class DwarfStringPoolEntryRef {
33   PointerIntPair<const StringMapEntry<DwarfStringPoolEntry> *, 1, bool>
34       MapEntryAndIndexed;
35 
getMapEntry()36   const StringMapEntry<DwarfStringPoolEntry> *getMapEntry() const {
37     return MapEntryAndIndexed.getPointer();
38   }
39 
40 public:
41   DwarfStringPoolEntryRef() = default;
DwarfStringPoolEntryRef(const StringMapEntry<DwarfStringPoolEntry> & Entry,bool Indexed)42   DwarfStringPoolEntryRef(const StringMapEntry<DwarfStringPoolEntry> &Entry,
43                           bool Indexed)
44       : MapEntryAndIndexed(&Entry, Indexed) {}
45 
46   explicit operator bool() const { return getMapEntry(); }
getSymbol()47   MCSymbol *getSymbol() const {
48     assert(getMapEntry()->second.Symbol && "No symbol available!");
49     return getMapEntry()->second.Symbol;
50   }
getOffset()51   unsigned getOffset() const { return getMapEntry()->second.Offset; }
isIndexed()52   bool isIndexed() const { return MapEntryAndIndexed.getInt(); }
getIndex()53   unsigned getIndex() const {
54     assert(isIndexed());
55     assert(getMapEntry()->getValue().isIndexed());
56     return getMapEntry()->second.Index;
57   }
getString()58   StringRef getString() const { return getMapEntry()->first(); }
59   /// Return the entire string pool entry for convenience.
getEntry()60   DwarfStringPoolEntry getEntry() const { return getMapEntry()->getValue(); }
61 
62   bool operator==(const DwarfStringPoolEntryRef &X) const {
63     return getMapEntry() == X.getMapEntry();
64   }
65   bool operator!=(const DwarfStringPoolEntryRef &X) const {
66     return getMapEntry() != X.getMapEntry();
67   }
68 };
69 
70 } // end namespace llvm
71 
72 #endif
73