AlignFragment.h revision 22add6ff3426df1a85089fe6a6e1597ee3b6f300 
1//===- AlignFragment.h ----------------------------------------------------===//
2//
3//                     The MCLinker Project
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9#ifndef MCLD_LD_ALIGNFRAGMENT_H
10#define MCLD_LD_ALIGNFRAGMENT_H
11#ifdef ENABLE_UNITTEST
12#include <gtest.h>
13#endif
14
15#include <mcld/Fragment/Fragment.h>
16
17namespace mcld {
18
19class SectionData;
20
21class AlignFragment : public Fragment
22{
23public:
24  AlignFragment(unsigned int pAlignment, int64_t pValue, unsigned int pValueSize,
25                unsigned int pMaxBytesToEmit, SectionData *pSD = NULL);
26
27  unsigned int getAlignment() const { return m_Alignment; }
28
29  int64_t getValue() const { return m_Value; }
30
31  unsigned int getValueSize() const { return m_ValueSize; }
32
33  unsigned int getMaxBytesToEmit() const { return m_MaxBytesToEmit; }
34
35  bool hasEmitNops() const { return m_bEmitNops; }
36
37  void setEmitNops(bool pValue) { m_bEmitNops = pValue; }
38
39  static bool classof(const Fragment *F)
40  { return F->getKind() == Fragment::Alignment; }
41  static bool classof(const AlignFragment *) { return true; }
42
43  size_t size() const;
44
45private:
46  /// Alignment - The alignment to ensure, in bytes.
47  unsigned int m_Alignment;
48
49  /// Value - Value to use for filling padding bytes.
50  int64_t m_Value;
51
52  /// ValueSize - The size of the integer (in bytes) of \arg Value.
53  unsigned int m_ValueSize;
54
55  /// MaxBytesToEmit - The maximum number of bytes to emit; if the alignment
56  /// cannot be satisfied in this width then this fragment is ignored.
57  unsigned int m_MaxBytesToEmit;
58
59  /// EmitNops - Flag to indicate that (optimal) NOPs should be emitted instead
60  /// of using the provided value. The exact interpretation of this flag is
61  /// target dependent.
62  bool m_bEmitNops : 1;
63
64};
65
66} // namespace of mcld
67
68#endif
69
70