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annotate lib/CodeGen/AsmPrinter/AddressPool.h @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
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children afa8332a0e37
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1 //===-- llvm/CodeGen/AddressPool.h - Dwarf Debug Framework -----*- C++ -*--===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
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11 #define LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
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12
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13 #include "llvm/ADT/DenseMap.h"
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14
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15 namespace llvm {
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16 class MCSection;
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17 class MCSymbol;
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18 class AsmPrinter;
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19 // Collection of addresses for this unit and assorted labels.
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20 // A Symbol->unsigned mapping of addresses used by indirect
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21 // references.
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22 class AddressPool {
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23 struct AddressPoolEntry {
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24 unsigned Number;
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25 bool TLS;
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26 AddressPoolEntry(unsigned Number, bool TLS) : Number(Number), TLS(TLS) {}
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27 };
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28 DenseMap<const MCSymbol *, AddressPoolEntry> Pool;
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29
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30 /// Record whether the AddressPool has been queried for an address index since
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31 /// the last "resetUsedFlag" call. Used to implement type unit fallback - a
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32 /// type that references addresses cannot be placed in a type unit when using
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33 /// fission.
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34 bool HasBeenUsed;
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35
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36 public:
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37 AddressPool() : HasBeenUsed(false) {}
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38
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39 /// \brief Returns the index into the address pool with the given
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40 /// label/symbol.
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41 unsigned getIndex(const MCSymbol *Sym, bool TLS = false);
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42
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43 void emit(AsmPrinter &Asm, const MCSection *AddrSection);
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44
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45 bool isEmpty() { return Pool.empty(); }
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46
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47 bool hasBeenUsed() const { return HasBeenUsed; }
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48
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49 void resetUsedFlag() { HasBeenUsed = false; }
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50 };
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51 }
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52 #endif