MCSectionCOFF.h revision df39be6cb4eb44011db3d3e86f8fe463f81ce127 
1//===- MCSectionCOFF.h - COFF 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 MCSectionCOFF class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_MC_MCSECTIONCOFF_H
15#define LLVM_MC_MCSECTIONCOFF_H
16
17#include "llvm/ADT/StringRef.h"
18#include "llvm/MC/MCSection.h"
19#include "llvm/Support/COFF.h"
20
21namespace llvm {
22
23/// MCSectionCOFF - This represents a section on Windows
24  class MCSectionCOFF : public MCSection {
25    // The memory for this string is stored in the same MCContext as *this.
26    StringRef SectionName;
27
28    /// Characteristics - This is the Characteristics field of a section,
29    //  drawn from the enums below.
30    unsigned Characteristics;
31
32    /// Selection - This is the Selection field for the section symbol, if
33    /// it is a COMDAT section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0
34    int Selection;
35
36  private:
37    friend class MCContext;
38    MCSectionCOFF(StringRef Section, unsigned Characteristics,
39                  int Selection, SectionKind K)
40      : MCSection(SV_COFF, K), SectionName(Section),
41        Characteristics(Characteristics), Selection (Selection) {
42      assert ((Characteristics & 0x00F00000) == 0 &&
43        "alignment must not be set upon section creation");
44    }
45    ~MCSectionCOFF();
46
47  public:
48    /// ShouldOmitSectionDirective - Decides whether a '.section' directive
49    /// should be printed before the section name
50    bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
51
52    StringRef getSectionName() const { return SectionName; }
53    virtual std::string getLabelBeginName() const {
54      return SectionName.str() + "_begin";
55    }
56    virtual std::string getLabelEndName() const {
57      return SectionName.str() + "_end";
58    }
59    unsigned getCharacteristics() const { return Characteristics; }
60    int getSelection () const { return Selection; }
61
62    virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
63                                      raw_ostream &OS,
64                                      const MCExpr *Subsection) const;
65    virtual bool UseCodeAlign() const;
66    virtual bool isVirtualSection() const;
67
68    static bool classof(const MCSection *S) {
69      return S->getVariant() == SV_COFF;
70    }
71  };
72
73} // end namespace llvm
74
75#endif
76