MCSection.h revision e4f6d7461aea7308e85c219c1cea5bd6059d4841 
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    };
37
38  private:
39    MCSection(const MCSection&);      // DO NOT IMPLEMENT
40    void operator=(const MCSection&); // DO NOT IMPLEMENT
41  protected:
42    MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {}
43    SectionVariant Variant;
44    SectionKind Kind;
45  public:
46    virtual ~MCSection();
47
48    SectionKind getKind() const { return Kind; }
49
50    SectionVariant getVariant() const { return Variant; }
51
52    virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
53                                      raw_ostream &OS) const = 0;
54
55    // UseCodeAlign - Return true if a .align directive should use
56    // "optimized nops" to fill instead of 0s.
57    virtual bool UseCodeAlign() const = 0;
58
59    /// isVirtualSection - Check whether this section is "virtual", that is
60    /// has no actual object file contents.
61    virtual bool isVirtualSection() const = 0;
62
63    static bool classof(const MCSection *) { return true; }
64  };
65
66} // end namespace llvm
67
68#endif
69