OpenCores
URL https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk

Subversion Repositories openrisc_me

[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.20.1/] [gold/] [icf.h] - Blame information for rev 205

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 205 julius
// icf.h --  Identical Code Folding
2
 
3
// Copyright 2009 Free Software Foundation, Inc.
4
// Written by Sriraman Tallam <tmsriram@google.com>.
5
 
6
// This file is part of gold.
7
 
8
// This program is free software; you can redistribute it and/or modify
9
// it under the terms of the GNU General Public License as published by
10
// the Free Software Foundation; either version 3 of the License, or
11
// (at your option) any later version.
12
 
13
// This program is distributed in the hope that it will be useful,
14
// but WITHOUT ANY WARRANTY; without even the implied warranty of
15
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
// GNU General Public License for more details.
17
 
18
// You should have received a copy of the GNU General Public License
19
// along with this program; if not, write to the Free Software
20
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21
// MA 02110-1301, USA.
22
 
23
#ifndef GOLD_ICF_H
24
#define GOLD_ICF_H
25
 
26
#include <vector>
27
 
28
#include "elfcpp.h"
29
#include "symtab.h"
30
 
31
namespace gold
32
{
33
 
34
class Object;
35
class Input_objects;
36
class Symbol_table;
37
 
38
typedef std::pair<Object*, unsigned int> Section_id;
39
 
40
class Icf
41
{
42
 public:
43
  struct Section_id_hash
44
  {
45
    size_t operator()(const Section_id& loc) const
46
    { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; }
47
  };
48
 
49
  typedef std::vector<Section_id> Sections_reachable_list;
50
  typedef std::vector<Symbol*> Symbol_info;
51
  typedef std::vector<std::pair<long long, long long> > Addend_info;
52
  typedef Unordered_map<Section_id,
53
                        Sections_reachable_list,
54
                        Section_id_hash> Section_list;
55
  typedef Unordered_map<Section_id, Symbol_info, Section_id_hash> Symbol_list;
56
  typedef Unordered_map<Section_id, Addend_info, Section_id_hash> Addend_list;
57
  typedef Unordered_map<Section_id,
58
                        unsigned int,
59
                        Section_id_hash> Uniq_secn_id_map;
60
 
61
  Icf()
62
  : id_section_(), section_id_(), kept_section_id_(),
63
    num_tracked_relocs(NULL), icf_ready_(false),
64
    section_reloc_list_(), symbol_reloc_list_(),
65
    addend_reloc_list_()
66
  { }
67
 
68
  // Returns the kept folded identical section corresponding to
69
  // dup_obj and dup_shndx.
70
  Section_id
71
  get_folded_section(Object* dup_obj, unsigned int dup_shndx);
72
 
73
  // Forms groups of identical sections where the first member
74
  // of each group is the kept section during folding.
75
  void
76
  find_identical_sections(const Input_objects* input_objects,
77
                          Symbol_table* symtab);
78
 
79
  // This is set when ICF has been run and the groups of
80
  // identical sections have been formed.
81
  void
82
  icf_ready()
83
  { this->icf_ready_ = true; }
84
 
85
  // Returns true if ICF has been run.
86
  bool
87
  is_icf_ready()
88
  { return this->icf_ready_; }
89
 
90
  // Unfolds the section denoted by OBJ and SHNDX if folded.
91
  void
92
  unfold_section(Object* obj, unsigned int shndx);
93
 
94
  // Returns the kept section corresponding to the 
95
  // given section.
96
  bool
97
  is_section_folded(Object* obj, unsigned int shndx);
98
 
99
  // Returns a map of a section to a list of all sections referenced
100
  // by its relocations.
101
  Section_list&
102
  section_reloc_list()
103
  { return this->section_reloc_list_; }
104
 
105
  // Returns a map of  a section to a list of all symbols referenced
106
  // by its relocations.
107
  Symbol_list&
108
  symbol_reloc_list()
109
  { return this->symbol_reloc_list_; }
110
 
111
  // Returns a maps of a section to a list of symbol values and addends
112
  // of its relocations.
113
  Addend_list&
114
  addend_reloc_list()
115
  { return this->addend_reloc_list_; }
116
 
117
  // Returns a mapping of each section to a unique integer.
118
  Uniq_secn_id_map&
119
  section_to_int_map()
120
  { return this->section_id_; }
121
 
122
 private:
123
 
124
  // Maps integers to sections.
125
  std::vector<Section_id> id_section_;
126
  // Does the reverse.
127
  Uniq_secn_id_map section_id_;
128
  // Given a section id, this maps it to the id of the kept
129
  // section.  If the id's are the same then this section is
130
  // not folded.
131
  std::vector<unsigned int> kept_section_id_;
132
  unsigned int* num_tracked_relocs;
133
  // Flag to indicate if ICF has been run.
134
  bool icf_ready_;
135
 
136
  // These lists are populated by gc_process_relocs in gc.h.
137
  Section_list section_reloc_list_;
138
  Symbol_list symbol_reloc_list_;
139
  Addend_list addend_reloc_list_;
140
};
141
 
142
} // End of namespace gold.
143
 
144
#endif

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.