1 // fileread.cc -- read files for gold
3 // Copyright 2006, 2007 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@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.
31 #include "dirsearch.h"
37 // Class File_read::View.
39 File_read::View::~View()
41 gold_assert(!this->is_locked());
46 File_read::View::lock()
52 File_read::View::unlock()
54 gold_assert(this->lock_count_ > 0);
59 File_read::View::is_locked()
61 return this->lock_count_ > 0;
66 // The File_read class is designed to support file descriptor caching,
67 // but this is not currently implemented.
69 File_read::~File_read()
71 gold_assert(this->lock_count_ == 0);
72 if (this->descriptor_ >= 0)
74 if (close(this->descriptor_) < 0)
75 fprintf(stderr, _("%s: warning: close(%s) failed: %s"),
76 program_name, this->name_.c_str(), strerror(errno));
77 this->descriptor_ = -1;
80 this->clear_views(true);
86 File_read::open(const std::string& name)
88 gold_assert(this->lock_count_ == 0
89 && this->descriptor_ < 0
90 && this->name_.empty());
92 this->descriptor_ = ::open(this->name_.c_str(), O_RDONLY);
94 return this->descriptor_ >= 0;
97 // Open the file for testing purposes.
100 File_read::open(const std::string& name, const unsigned char* contents,
103 gold_assert(this->lock_count_ == 0
104 && this->descriptor_ < 0
105 && this->name_.empty());
107 this->contents_ = contents;
108 this->contents_size_ = contents_size;
122 gold_assert(this->lock_count_ > 0);
127 File_read::is_locked()
129 return this->lock_count_ > 0;
132 // See if we have a view which covers the file starting at START for
133 // SIZE bytes. Return a pointer to the View if found, NULL if not.
135 inline File_read::View*
136 File_read::find_view(off_t start, off_t size)
138 off_t page = File_read::page_offset(start);
139 Views::iterator p = this->views_.find(page);
140 if (p == this->views_.end())
142 if (p->second->size() - (start - page) < size)
147 // Read data from the file. Return the number of bytes read. If
148 // PBYTES is not NULL, store the number of bytes in *PBYTES, otherwise
149 // require that we read exactly the number of bytes requested.
152 File_read::do_read(off_t start, off_t size, void* p, off_t* pbytes)
154 gold_assert(this->lock_count_ > 0);
157 if (this->contents_ == NULL)
159 int o = this->descriptor_;
161 if (lseek(o, start, SEEK_SET) < 0)
163 fprintf(stderr, _("%s: %s: lseek to %lld failed: %s"),
164 program_name, this->filename().c_str(),
165 static_cast<long long>(start),
170 bytes = ::read(o, p, size);
173 fprintf(stderr, _("%s: %s: read failed: %s\n"),
174 program_name, this->filename().c_str(), strerror(errno));
180 bytes = this->contents_size_ - start;
183 else if (bytes > size)
185 memcpy(p, this->contents_ + start, bytes);
190 else if (bytes != size)
193 _("%s: %s: file too short: read only %lld of %lld "
195 program_name, this->filename().c_str(),
196 static_cast<long long>(bytes),
197 static_cast<long long>(size),
198 static_cast<long long>(start));
206 File_read::read(off_t start, off_t size, void* p, off_t* pbytes)
208 gold_assert(this->lock_count_ > 0);
210 File_read::View* pv = this->find_view(start, size);
213 memcpy(p, pv->data() + (start - pv->start()), size);
219 this->do_read(start, size, p, pbytes);
222 // Find an existing view or make a new one.
225 File_read::find_or_make_view(off_t start, off_t size, off_t* pbytes)
227 gold_assert(this->lock_count_ > 0);
229 off_t poff = File_read::page_offset(start);
231 File_read::View* const vnull = NULL;
232 std::pair<Views::iterator, bool> ins =
233 this->views_.insert(std::make_pair(poff, vnull));
237 // There was an existing view at this offset.
238 File_read::View* v = ins.first->second;
239 if (v->size() - (start - v->start()) >= size)
246 // This view is not large enough.
247 this->saved_views_.push_back(v);
250 // We need to read data from the file.
252 off_t psize = File_read::pages(size + (start - poff));
253 unsigned char* p = new unsigned char[psize];
256 off_t bytes = this->do_read(poff, psize, p, &got_bytes);
258 File_read::View* v = new File_read::View(poff, bytes, p);
260 ins.first->second = v;
262 if (bytes - (start - poff) >= size)
271 *pbytes = bytes - (start - poff);
276 _("%s: %s: file too short: read only %lld of %lld bytes at %lld\n"),
277 program_name, this->filename().c_str(),
278 static_cast<long long>(bytes - (start - poff)),
279 static_cast<long long>(size),
280 static_cast<long long>(start));
284 // This implementation of get_view just reads into a memory buffer,
285 // which we store on view_list_. At some point we should support
289 File_read::get_view(off_t start, off_t size, off_t* pbytes)
291 gold_assert(this->lock_count_ > 0);
292 File_read::View* pv = this->find_or_make_view(start, size, pbytes);
293 return pv->data() + (start - pv->start());
297 File_read::get_lasting_view(off_t start, off_t size, off_t* pbytes)
299 gold_assert(this->lock_count_ > 0);
300 File_read::View* pv = this->find_or_make_view(start, size, pbytes);
302 return new File_view(*this, pv, pv->data() + (start - pv->start()));
305 // Remove all the file views.
308 File_read::clear_views(bool destroying)
310 for (Views::iterator p = this->views_.begin();
311 p != this->views_.end();
314 if (!p->second->is_locked())
318 gold_assert(!destroying);
319 this->saved_views_.push_back(p->second);
322 this->views_.clear();
324 Saved_views::iterator p = this->saved_views_.begin();
325 while (p != this->saved_views_.end())
327 if (!(*p)->is_locked())
330 p = this->saved_views_.erase(p);
334 gold_assert(!destroying);
342 File_view::~File_view()
344 gold_assert(this->file_.is_locked());
345 this->view_->unlock();
350 // Create a file for testing.
352 Input_file::Input_file(const char* name, const unsigned char* contents,
356 this->input_argument_ =
357 new Input_file_argument(name, false, Position_dependent_options());
358 bool ok = file_.open(name, contents, size);
365 Input_file::open(const General_options& options, const Dirsearch& dirpath)
368 if (!this->input_argument_->is_lib())
369 name = this->input_argument_->name();
372 std::string n1("lib");
373 n1 += this->input_argument_->name();
375 if (options.is_static())
382 name = dirpath.find(n1, n2);
385 fprintf(stderr, _("%s: cannot find %s\n"), program_name,
386 this->input_argument_->name());
391 if (!this->file_.open(name))
393 fprintf(stderr, _("%s: cannot open %s: %s\n"), program_name,
394 name.c_str(), strerror(errno));
399 } // End namespace gold.