• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 //===-- llvm/CodeGen/AddressPool.h - Dwarf Debug Framework -----*- 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_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
11 #define LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
12 
13 #include "llvm/ADT/DenseMap.h"
14 #include "llvm/MC/MCSymbol.h"
15 
16 namespace llvm {
17 class MCSection;
18 class AsmPrinter;
19 // Collection of addresses for this unit and assorted labels.
20 // A Symbol->unsigned mapping of addresses used by indirect
21 // references.
22 class AddressPool {
23   struct AddressPoolEntry {
24     unsigned Number;
25     bool TLS;
AddressPoolEntryAddressPoolEntry26     AddressPoolEntry(unsigned Number, bool TLS) : Number(Number), TLS(TLS) {}
27   };
28   DenseMap<const MCSymbol *, AddressPoolEntry> Pool;
29 
30   /// Record whether the AddressPool has been queried for an address index since
31   /// the last "resetUsedFlag" call. Used to implement type unit fallback - a
32   /// type that references addresses cannot be placed in a type unit when using
33   /// fission.
34   bool HasBeenUsed;
35 
36 public:
AddressPool()37   AddressPool() : HasBeenUsed(false) {}
38 
39   /// \brief Returns the index into the address pool with the given
40   /// label/symbol.
41   unsigned getIndex(const MCSymbol *Sym, bool TLS = false);
42 
43   void emit(AsmPrinter &Asm, MCSection *AddrSection);
44 
isEmpty()45   bool isEmpty() { return Pool.empty(); }
46 
hasBeenUsed()47   bool hasBeenUsed() const { return HasBeenUsed; }
48 
resetUsedFlag()49   void resetUsedFlag() { HasBeenUsed = false; }
50 };
51 }
52 #endif
53