src/llvm/lib/CodeGen/AsmPrinter/AddressPool.h

   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
  15 namespace llvm {
  16 class MCSection;
  17 class MCSymbol;
  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;
  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
  36 public:
  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