AddressPool.h revision dce4a407a24b04eebc6a376f8e62b41aaa7b071f 
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 CODEGEN_ASMPRINTER_ADDRESSPOOL_H__
11#define CODEGEN_ASMPRINTER_ADDRESSPOOL_H__
12
13#include "llvm/ADT/DenseMap.h"
14
15namespace llvm {
16class MCSection;
17class MCSymbol;
18class AsmPrinter;
19// Collection of addresses for this unit and assorted labels.
20// A Symbol->unsigned mapping of addresses used by indirect
21// references.
22class AddressPool {
23  struct AddressPoolEntry {
24    unsigned Number;
25    bool TLS;
26    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
36public:
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, const MCSection *AddrSection);
44
45  bool isEmpty() { return Pool.empty(); }
46
47  bool hasBeenUsed() const { return HasBeenUsed; }
48
49  void resetUsedFlag() { HasBeenUsed = false; }
50};
51}
52#endif
53