MCSection.h revision dd2ad8432f104282ff43c94457f474ea0a264175 
1//===- MCSection.h - Machine Code Sections ----------------------*- 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// This file declares the MCSection class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_MC_MCSECTION_H
15#define LLVM_MC_MCSECTION_H
16
17#include <string>
18#include "llvm/ADT/StringRef.h"
19#include "llvm/MC/SectionKind.h"
20#include "llvm/Support/Casting.h"
21
22namespace llvm {
23  class MCContext;
24  class MCAsmInfo;
25  class raw_ostream;
26
27  /// MCSection - Instances of this class represent a uniqued identifier for a
28  /// section in the current translation unit.  The MCContext class uniques and
29  /// creates these.
30  class MCSection {
31  public:
32    enum SectionVariant {
33      SV_COFF = 0,
34      SV_ELF,
35      SV_MachO,
36      SV_PIC16
37    };
38
39  private:
40    MCSection(const MCSection&);      // DO NOT IMPLEMENT
41    void operator=(const MCSection&); // DO NOT IMPLEMENT
42  protected:
43    MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {}
44    SectionVariant Variant;
45    SectionKind Kind;
46  public:
47    virtual ~MCSection();
48
49    SectionKind getKind() const { return Kind; }
50
51    SectionVariant getVariant() const { return Variant; }
52
53    virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
54                                      raw_ostream &OS) const = 0;
55
56    /// isBaseAddressKnownZero - Return true if we know that this section will
57    /// get a base address of zero.  In cases where we know that this is true we
58    /// can emit section offsets as direct references to avoid a subtraction
59    /// from the base of the section, saving a relocation.
60    virtual bool isBaseAddressKnownZero() const {
61      return false;
62    }
63
64    static bool classof(const MCSection *) { return true; }
65  };
66
67} // end namespace llvm
68
69#endif
70