1
// gc.cc -- garbage collection of unused sections
3
// Copyright 2009 Free Software Foundation, Inc.
4
// Written by Sriraman Tallam <tmsriram@google.com>.
6
// This file is part of gold.
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.
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.
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.
32
// Garbage collection uses a worklist style algorithm to determine the
33
// transitive closure of all referenced sections.
35
Garbage_collection::do_transitive_closure()
37
while (!this->worklist().empty())
39
// Add elements from the work list to the referenced list
41
Section_id entry = this->worklist().front();
42
this->worklist().pop();
43
if (this->referenced_list().find(entry)
44
== this->referenced_list().end())
46
this->referenced_list().insert(entry);
52
Garbage_collection::Section_ref::iterator find_it =
53
this->section_reloc_map().find(entry);
54
if (find_it == this->section_reloc_map().end())
56
Garbage_collection::Sections_reachable v = find_it->second;
57
// Scan the vector of references for each work_list entry.
58
for (Garbage_collection::Sections_reachable::iterator it_v = v.begin();
62
// Do not add already processed sections to the work_list.
63
if (this->referenced_list().find(*it_v)
64
== this->referenced_list().end())
66
this->worklist().push(*it_v);
70
this->worklist_ready();
73
} // End namespace gold.