// fileread.cc -- read files for gold
+// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
#include "gold.h"
#include <cstring>
#include <cerrno>
#include <fcntl.h>
#include <unistd.h>
+#include <sys/mman.h>
#include "options.h"
#include "dirsearch.h"
File_read::View::~View()
{
gold_assert(!this->is_locked());
- delete[] this->data_;
+ if (!this->mapped_)
+ delete[] this->data_;
+ else
+ {
+ if (::munmap(const_cast<unsigned char*>(this->data_), this->size_) != 0)
+ fprintf(stderr, _("%s: munmap failed: %s\n"),
+ program_name, strerror(errno));
+ }
}
void
&& this->descriptor_ < 0
&& this->name_.empty());
this->name_ = name;
+
this->descriptor_ = ::open(this->name_.c_str(), O_RDONLY);
+
+ if (this->descriptor_ >= 0)
+ {
+ struct stat s;
+ if (::fstat(this->descriptor_, &s) < 0)
+ {
+ fprintf(stderr, _("%s: %s: fstat failed: %s"), program_name,
+ this->name_.c_str(), strerror(errno));
+ gold_exit(false);
+ }
+ this->size_ = s.st_size;
+ }
+
++this->lock_count_;
+
return this->descriptor_ >= 0;
}
bool
File_read::open(const std::string& name, const unsigned char* contents,
- off_t contents_size)
+ off_t size)
{
gold_assert(this->lock_count_ == 0
&& this->descriptor_ < 0
&& this->name_.empty());
this->name_ = name;
this->contents_ = contents;
- this->contents_size_ = contents_size;
+ this->size_ = size;
++this->lock_count_;
return true;
}
{
gold_assert(this->lock_count_ > 0);
--this->lock_count_;
+ if (this->lock_count_ == 0)
+ this->clear_views(false);
}
bool
return p->second;
}
-// Read data from the file. Return the number of bytes read. If
-// PBYTES is not NULL, store the number of bytes in *PBYTES, otherwise
-// require that we read exactly the number of bytes requested.
+// Read SIZE bytes from the file starting at offset START. Read into
+// the buffer at P.
-off_t
-File_read::do_read(off_t start, off_t size, void* p, off_t* pbytes)
+void
+File_read::do_read(off_t start, off_t size, void* p)
{
gold_assert(this->lock_count_ > 0);
off_t bytes;
- if (this->contents_ == NULL)
+ if (this->contents_ != NULL)
{
- int o = this->descriptor_;
-
- if (lseek(o, start, SEEK_SET) < 0)
+ bytes = this->size_ - start;
+ if (bytes >= size)
{
- fprintf(stderr, _("%s: %s: lseek to %lld failed: %s"),
- program_name, this->filename().c_str(),
- static_cast<long long>(start),
- strerror(errno));
- gold_exit(false);
+ memcpy(p, this->contents_ + start, size);
+ return;
}
+ }
+ else
+ {
+ bytes = ::pread(this->descriptor_, p, size, start);
+ if (bytes == size)
+ return;
- bytes = ::read(o, p, size);
if (bytes < 0)
{
- fprintf(stderr, _("%s: %s: read failed: %s\n"),
+ fprintf(stderr, _("%s: %s: pread failed: %s\n"),
program_name, this->filename().c_str(), strerror(errno));
gold_exit(false);
}
}
- else
- {
- bytes = this->contents_size_ - start;
- if (bytes < 0)
- bytes = 0;
- else if (bytes > size)
- bytes = size;
- memcpy(p, this->contents_ + start, bytes);
- }
- if (pbytes != NULL)
- *pbytes = bytes;
- else if (bytes != size)
- {
- fprintf(stderr,
- _("%s: %s: file too short: read only %lld of %lld "
- "bytes at %lld\n"),
- program_name, this->filename().c_str(),
- static_cast<long long>(bytes),
- static_cast<long long>(size),
- static_cast<long long>(start));
- gold_exit(false);
- }
-
- return bytes;
+ fprintf(stderr,
+ _("%s: %s: file too short: read only %lld of %lld bytes at %lld\n"),
+ program_name, this->filename().c_str(),
+ static_cast<long long>(bytes),
+ static_cast<long long>(size),
+ static_cast<long long>(start));
+ gold_exit(false);
}
+// Read data from the file.
+
void
-File_read::read(off_t start, off_t size, void* p, off_t* pbytes)
+File_read::read(off_t start, off_t size, void* p)
{
gold_assert(this->lock_count_ > 0);
if (pv != NULL)
{
memcpy(p, pv->data() + (start - pv->start()), size);
- if (pbytes != NULL)
- *pbytes = size;
return;
}
- this->do_read(start, size, p, pbytes);
+ this->do_read(start, size, p);
}
// Find an existing view or make a new one.
File_read::View*
-File_read::find_or_make_view(off_t start, off_t size, off_t* pbytes)
+File_read::find_or_make_view(off_t start, off_t size, bool cache)
{
gold_assert(this->lock_count_ > 0);
File_read::View* v = ins.first->second;
if (v->size() - (start - v->start()) >= size)
{
- if (pbytes != NULL)
- *pbytes = size;
+ if (cache)
+ v->set_cache();
return v;
}
this->saved_views_.push_back(v);
}
- // We need to read data from the file.
+ // We need to read data from the file. We read full pages for
+ // greater efficiency on small files.
off_t psize = File_read::pages(size + (start - poff));
- unsigned char* p = new unsigned char[psize];
- off_t got_bytes;
- off_t bytes = this->do_read(poff, psize, p, &got_bytes);
-
- File_read::View* v = new File_read::View(poff, bytes, p);
+ if (poff + psize >= this->size_)
+ {
+ psize = this->size_ - poff;
+ gold_assert(psize >= size);
+ }
- ins.first->second = v;
+ File_read::View* v;
- if (bytes - (start - poff) >= size)
+ if (this->contents_ != NULL)
{
- if (pbytes != NULL)
- *pbytes = size;
- return v;
+ unsigned char* p = new unsigned char[psize];
+ this->do_read(poff, psize, p);
+ v = new File_read::View(poff, psize, p, cache, false);
}
-
- if (pbytes != NULL)
+ else
{
- *pbytes = bytes - (start - poff);
- return v;
+ void* p = ::mmap(NULL, psize, PROT_READ, MAP_SHARED,
+ this->descriptor_, poff);
+ if (p == MAP_FAILED)
+ {
+ fprintf(stderr, _("%s: %s: mmap offset %lld size %lld failed: %s\n"),
+ program_name, this->filename().c_str(),
+ static_cast<long long>(poff),
+ static_cast<long long>(psize),
+ strerror(errno));
+ gold_exit(false);
+ }
+
+ const unsigned char* pbytes = static_cast<const unsigned char*>(p);
+ v = new File_read::View(poff, psize, pbytes, cache, true);
}
- fprintf(stderr,
- _("%s: %s: file too short: read only %lld of %lld bytes at %lld\n"),
- program_name, this->filename().c_str(),
- static_cast<long long>(bytes - (start - poff)),
- static_cast<long long>(size),
- static_cast<long long>(start));
- gold_exit(false);
+ ins.first->second = v;
+ return v;
}
// This implementation of get_view just reads into a memory buffer,
// mmap.
const unsigned char*
-File_read::get_view(off_t start, off_t size, off_t* pbytes)
+File_read::get_view(off_t start, off_t size, bool cache)
{
gold_assert(this->lock_count_ > 0);
- File_read::View* pv = this->find_or_make_view(start, size, pbytes);
+ File_read::View* pv = this->find_or_make_view(start, size, cache);
return pv->data() + (start - pv->start());
}
File_view*
-File_read::get_lasting_view(off_t start, off_t size, off_t* pbytes)
+File_read::get_lasting_view(off_t start, off_t size, bool cache)
{
gold_assert(this->lock_count_ > 0);
- File_read::View* pv = this->find_or_make_view(start, size, pbytes);
+ File_read::View* pv = this->find_or_make_view(start, size, cache);
pv->lock();
return new File_view(*this, pv, pv->data() + (start - pv->start()));
}
p != this->views_.end();
++p)
{
- if (!p->second->is_locked())
+ if (!p->second->is_locked()
+ && (destroying || !p->second->should_cache()))
delete p->second;
else
{
Saved_views::iterator p = this->saved_views_.begin();
while (p != this->saved_views_.end())
{
- if (!(*p)->is_locked())
+ if (!(*p)->is_locked()
+ && (destroying || !(*p)->should_cache()))
{
delete *p;
p = this->saved_views_.erase(p);
projects / deliverable / binutils-gdb.git / blobdiff