// 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 <cassert>
#include <cstring>
#include <cerrno>
#include <fcntl.h>
#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/uio.h>
+#include "filenames.h"
+#include "parameters.h"
#include "options.h"
#include "dirsearch.h"
+#include "target.h"
+#include "binary.h"
#include "fileread.h"
namespace gold
File_read::View::~View()
{
- assert(!this->is_locked());
- delete[] this->data_;
+ gold_assert(!this->is_locked());
+ if (!this->mapped_)
+ delete[] this->data_;
+ else
+ {
+ if (::munmap(const_cast<unsigned char*>(this->data_), this->size_) != 0)
+ gold_warning(_("munmap failed: %s"), strerror(errno));
+
+ File_read::current_mapped_bytes -= this->size_;
+ }
}
void
void
File_read::View::unlock()
{
- assert(this->lock_count_ > 0);
+ gold_assert(this->lock_count_ > 0);
--this->lock_count_;
}
// Class File_read.
+// The File_read static variables.
+unsigned long long File_read::total_mapped_bytes;
+unsigned long long File_read::current_mapped_bytes;
+unsigned long long File_read::maximum_mapped_bytes;
+
// The File_read class is designed to support file descriptor caching,
// but this is not currently implemented.
File_read::~File_read()
{
- assert(this->lock_count_ == 0);
+ gold_assert(this->token_.is_writable());
if (this->descriptor_ >= 0)
{
if (close(this->descriptor_) < 0)
- fprintf(stderr, _("%s: warning: close(%s) failed: %s"),
- program_name, this->name_.c_str(), strerror(errno));
+ gold_warning(_("close of %s failed: %s"),
+ this->name_.c_str(), strerror(errno));
this->descriptor_ = -1;
}
this->name_.clear();
this->clear_views(true);
}
+// Open the file.
+
bool
-File_read::open(const std::string& name)
+File_read::open(const Task* task, const std::string& name)
{
- assert(this->lock_count_ == 0
- && this->descriptor_ < 0
- && this->name_.empty());
+ gold_assert(this->token_.is_writable()
+ && this->descriptor_ < 0
+ && this->name_.empty());
this->name_ = name;
+
this->descriptor_ = ::open(this->name_.c_str(), O_RDONLY);
- ++this->lock_count_;
+
+ if (this->descriptor_ >= 0)
+ {
+ struct stat s;
+ if (::fstat(this->descriptor_, &s) < 0)
+ gold_error(_("%s: fstat failed: %s"),
+ this->name_.c_str(), strerror(errno));
+ this->size_ = s.st_size;
+ }
+
+ this->token_.add_writer(task);
+
return this->descriptor_ >= 0;
}
-int
-File_read::get_descriptor()
+// Open the file with the contents in memory.
+
+bool
+File_read::open(const Task* task, const std::string& name,
+ const unsigned char* contents, off_t size)
+{
+ gold_assert(this->token_.is_writable()
+ && this->descriptor_ < 0
+ && this->name_.empty());
+ this->name_ = name;
+ this->contents_ = contents;
+ this->size_ = size;
+ this->token_.add_writer(task);
+ return true;
+}
+
+// Release the file. This is called when we are done with the file in
+// a Task.
+
+void
+File_read::release()
{
- assert(this->lock_count_ > 0);
- return this->descriptor_;
+ gold_assert(this->is_locked());
+
+ File_read::total_mapped_bytes += this->mapped_bytes_;
+ File_read::current_mapped_bytes += this->mapped_bytes_;
+ this->mapped_bytes_ = 0;
+ if (File_read::current_mapped_bytes > File_read::maximum_mapped_bytes)
+ File_read::maximum_mapped_bytes = File_read::current_mapped_bytes;
+
+ this->clear_views(false);
+
+ this->released_ = true;
}
+// Lock the file.
+
void
-File_read::lock()
+File_read::lock(const Task* task)
{
- ++this->lock_count_;
+ gold_assert(this->released_);
+ this->token_.add_writer(task);
+ this->released_ = false;
}
+// Unlock the file.
+
void
-File_read::unlock()
+File_read::unlock(const Task* task)
{
- assert(this->lock_count_ > 0);
- --this->lock_count_;
+ this->release();
+ this->token_.remove_writer(task);
}
+// Return whether the file is locked.
+
bool
-File_read::is_locked()
+File_read::is_locked() const
{
- return this->lock_count_ > 0;
+ if (!this->token_.is_writable())
+ return true;
+ // The file is not locked, so it should have been released.
+ gold_assert(this->released_);
+ return false;
}
// See if we have a view which covers the file starting at START for
// SIZE bytes. Return a pointer to the View if found, NULL if not.
-File_read::View*
-File_read::find_view(off_t start, off_t size)
+inline File_read::View*
+File_read::find_view(off_t start, section_size_type size) const
{
- for (std::list<File_read::View*>::iterator p = this->view_list_.begin();
- p != this->view_list_.end();
- ++p)
+ off_t page = File_read::page_offset(start);
+
+ Views::const_iterator p = this->views_.lower_bound(page);
+ if (p == this->views_.end() || p->first > page)
{
- if ((*p)->start() <= start
- && (*p)->start() + (*p)->size() >= start + size)
- return *p;
+ if (p == this->views_.begin())
+ return NULL;
+ --p;
}
- return NULL;
+
+ if (p->second->start() + static_cast<off_t>(p->second->size())
+ < start + static_cast<off_t>(size))
+ return NULL;
+
+ p->second->set_accessed();
+
+ 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, section_size_type size, void* p) const
{
- assert(this->lock_count_ > 0);
- int o = this->descriptor_;
-
- if (lseek(o, start, SEEK_SET) < 0)
+ ssize_t bytes;
+ if (this->contents_ != NULL)
{
- 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);
+ bytes = this->size_ - start;
+ if (static_cast<section_size_type>(bytes) >= size)
+ {
+ memcpy(p, this->contents_ + start, size);
+ return;
+ }
}
-
- off_t bytes = ::read(o, p, size);
- if (bytes < 0)
+ else
{
- fprintf(stderr, _("%s: %s: read failed: %s\n"),
- program_name, this->filename().c_str(), strerror(errno));
- gold_exit(false);
- }
+ bytes = ::pread(this->descriptor_, p, size, start);
+ if (static_cast<section_size_type>(bytes) == size)
+ return;
- 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);
+ if (bytes < 0)
+ {
+ gold_fatal(_("%s: pread failed: %s"),
+ this->filename().c_str(), strerror(errno));
+ return;
+ }
}
- return bytes;
+ gold_fatal(_("%s: file too short: read only %lld of %lld bytes at %lld"),
+ this->filename().c_str(),
+ static_cast<long long>(bytes),
+ static_cast<long long>(size),
+ static_cast<long long>(start));
}
+// 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, section_size_type size, void* p) const
{
- assert(this->lock_count_ > 0);
-
- File_read::View* pv = this->find_view(start, size);
+ const File_read::View* pv = this->find_view(start, size);
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, section_size_type size, bool cache)
{
- assert(this->lock_count_ > 0);
+ gold_assert(!this->token_.is_writable());
+ this->released_ = false;
- File_read::View* pv = this->find_view(start, size);
- if (pv != NULL)
- return pv;
+ File_read::View* v = this->find_view(start, size);
+ if (v != NULL)
+ {
+ if (cache)
+ v->set_cache();
+ return v;
+ }
+
+ off_t poff = File_read::page_offset(start);
- unsigned char* p = new unsigned char[size];
- off_t bytes = this->do_read(start, size, p, pbytes);
- pv = new File_read::View(start, bytes, p);
- this->view_list_.push_back(pv);
- return pv;
+ File_read::View* const vnull = NULL;
+ std::pair<Views::iterator, bool> ins =
+ this->views_.insert(std::make_pair(poff, vnull));
+
+ if (!ins.second)
+ {
+ // There was an existing view at this offset. It must not be
+ // large enough. We can't delete it here, since something might
+ // be using it; put it on a list to be deleted when the file is
+ // unlocked.
+ v = ins.first->second;
+ gold_assert(v->size() - (start - v->start()) < size);
+ if (v->should_cache())
+ cache = true;
+ v->clear_cache();
+ this->saved_views_.push_back(v);
+ }
+
+ // We need to map data from the file.
+
+ section_size_type psize = File_read::pages(size + (start - poff));
+
+ if (poff + static_cast<off_t>(psize) >= this->size_)
+ {
+ psize = this->size_ - poff;
+ gold_assert(psize >= size);
+ }
+
+ if (this->contents_ != NULL)
+ {
+ unsigned char* p = new unsigned char[psize];
+ this->do_read(poff, psize, p);
+ v = new File_read::View(poff, psize, p, cache, false);
+ }
+ else
+ {
+ void* p = ::mmap(NULL, psize, PROT_READ, MAP_PRIVATE,
+ this->descriptor_, poff);
+ if (p == MAP_FAILED)
+ gold_fatal(_("%s: mmap offset %lld size %lld failed: %s"),
+ this->filename().c_str(),
+ static_cast<long long>(poff),
+ static_cast<long long>(psize),
+ strerror(errno));
+
+ this->mapped_bytes_ += psize;
+
+ const unsigned char* pbytes = static_cast<const unsigned char*>(p);
+ v = new File_read::View(poff, psize, pbytes, cache, true);
+ }
+
+ ins.first->second = v;
+ return v;
}
-// This implementation of get_view just reads into a memory buffer,
-// which we store on view_list_. At some point we should support
-// mmap.
+// Get a view into the file.
const unsigned char*
-File_read::get_view(off_t start, off_t size, off_t* pbytes)
+File_read::get_view(off_t start, section_size_type size, bool cache)
{
- 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, section_size_type size, bool cache)
{
- 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()));
}
-// Remove all the file views.
+// Use readv to read COUNT entries from RM starting at START. BASE
+// must be added to all file offsets in RM.
+
+void
+File_read::do_readv(off_t base, const Read_multiple& rm, size_t start,
+ size_t count)
+{
+ unsigned char discard[File_read::page_size];
+ iovec iov[File_read::max_readv_entries * 2];
+ size_t iov_index = 0;
+
+ off_t first_offset = rm[start].file_offset;
+ off_t last_offset = first_offset;
+ ssize_t want = 0;
+ for (size_t i = 0; i < count; ++i)
+ {
+ const Read_multiple_entry& i_entry(rm[start + i]);
+
+ if (i_entry.file_offset > last_offset)
+ {
+ size_t skip = i_entry.file_offset - last_offset;
+ gold_assert(skip <= sizeof discard);
+
+ iov[iov_index].iov_base = discard;
+ iov[iov_index].iov_len = skip;
+ ++iov_index;
+
+ want += skip;
+ }
+
+ iov[iov_index].iov_base = i_entry.buffer;
+ iov[iov_index].iov_len = i_entry.size;
+ ++iov_index;
+
+ want += i_entry.size;
+
+ last_offset = i_entry.file_offset + i_entry.size;
+ }
+
+ gold_assert(iov_index < sizeof iov / sizeof iov[0]);
+
+ if (::lseek(this->descriptor_, base + first_offset, SEEK_SET) < 0)
+ gold_fatal(_("%s: lseek failed: %s"),
+ this->filename().c_str(), strerror(errno));
+
+ ssize_t got = ::readv(this->descriptor_, iov, iov_index);
+
+ if (got < 0)
+ gold_fatal(_("%s: readv failed: %s"),
+ this->filename().c_str(), strerror(errno));
+ if (got != want)
+ gold_fatal(_("%s: file too short: read only %zd of %zd bytes at %lld"),
+ this->filename().c_str(),
+ got, want, static_cast<long long>(base + first_offset));
+}
+
+// Read several pieces of data from the file.
+
+void
+File_read::read_multiple(off_t base, const Read_multiple& rm)
+{
+ size_t count = rm.size();
+ size_t i = 0;
+ while (i < count)
+ {
+ // Find up to MAX_READV_ENTRIES consecutive entries which are
+ // less than one page apart.
+ const Read_multiple_entry& i_entry(rm[i]);
+ off_t i_off = i_entry.file_offset;
+ off_t end_off = i_off + i_entry.size;
+ size_t j;
+ for (j = i + 1; j < count; ++j)
+ {
+ if (j - i >= File_read::max_readv_entries)
+ break;
+ const Read_multiple_entry& j_entry(rm[j]);
+ off_t j_off = j_entry.file_offset;
+ gold_assert(j_off >= end_off);
+ off_t j_end_off = j_off + j_entry.size;
+ if (j_end_off - end_off >= File_read::page_size)
+ break;
+ end_off = j_end_off;
+ }
+
+ if (j == i + 1)
+ this->read(base + i_off, i_entry.size, i_entry.buffer);
+ else
+ {
+ File_read::View* view = this->find_view(base + i_off,
+ end_off - i_off);
+ if (view == NULL)
+ this->do_readv(base, rm, i, j - i);
+ else
+ {
+ const unsigned char* v = (view->data()
+ + (base + i_off - view->start()));
+ for (size_t k = i; k < j; ++k)
+ {
+ const Read_multiple_entry& k_entry(rm[k]);
+ gold_assert((convert_to_section_size_type(k_entry.file_offset
+ - i_off)
+ + k_entry.size)
+ <= convert_to_section_size_type(end_off
+ - i_off));
+ memcpy(k_entry.buffer,
+ v + (k_entry.file_offset - i_off),
+ k_entry.size);
+ }
+ }
+ }
+
+ i = j;
+ }
+}
+
+// Mark all views as no longer cached.
+
+void
+File_read::clear_view_cache_marks()
+{
+ // Just ignore this if there are multiple objects associated with
+ // the file. Otherwise we will wind up uncaching and freeing some
+ // views for other objects.
+ if (this->object_count_ > 1)
+ return;
+
+ for (Views::iterator p = this->views_.begin();
+ p != this->views_.end();
+ ++p)
+ p->second->clear_cache();
+ for (Saved_views::iterator p = this->saved_views_.begin();
+ p != this->saved_views_.end();
+ ++p)
+ (*p)->clear_cache();
+}
+
+// Remove all the file views. For a file which has multiple
+// associated objects (i.e., an archive), we keep accessed views
+// around until next time, in the hopes that they will be useful for
+// the next object.
void
File_read::clear_views(bool destroying)
{
- std::list<File_read::View*>::iterator p = this->view_list_.begin();
- while (p != this->view_list_.end())
+ Views::iterator p = this->views_.begin();
+ while (p != this->views_.end())
{
- if ((*p)->is_locked())
+ bool should_delete;
+ if (p->second->is_locked())
+ should_delete = false;
+ else if (destroying)
+ should_delete = true;
+ else if (p->second->should_cache())
+ should_delete = false;
+ else if (this->object_count_ > 1 && p->second->accessed())
+ should_delete = false;
+ else
+ should_delete = true;
+
+ if (should_delete)
+ {
+ delete p->second;
+
+ // map::erase invalidates only the iterator to the deleted
+ // element.
+ Views::iterator pe = p;
+ ++p;
+ this->views_.erase(pe);
+ }
+ else
{
- assert(!destroying);
+ gold_assert(!destroying);
+ p->second->clear_accessed();
++p;
}
+ }
+
+ Saved_views::iterator q = this->saved_views_.begin();
+ while (q != this->saved_views_.end())
+ {
+ if (!(*q)->is_locked())
+ {
+ delete *q;
+ q = this->saved_views_.erase(q);
+ }
else
{
- delete *p;
- p = this->view_list_.erase(p);
+ gold_assert(!destroying);
+ ++q;
}
}
}
+// Print statistical information to stderr. This is used for --stats.
+
+void
+File_read::print_stats()
+{
+ fprintf(stderr, _("%s: total bytes mapped for read: %llu\n"),
+ program_name, File_read::total_mapped_bytes);
+ fprintf(stderr, _("%s: maximum bytes mapped for read at one time: %llu\n"),
+ program_name, File_read::maximum_mapped_bytes);
+}
+
// Class File_view.
File_view::~File_view()
{
- assert(this->file_.is_locked());
+ gold_assert(this->file_.is_locked());
this->view_->unlock();
}
// Class Input_file.
-void
-Input_file::open(const General_options& options, const Dirsearch& dirpath)
+// Create a file for testing.
+
+Input_file::Input_file(const Task* task, const char* name,
+ const unsigned char* contents, off_t size)
+ : file_()
+{
+ this->input_argument_ =
+ new Input_file_argument(name, false, "", false,
+ Position_dependent_options());
+ bool ok = file_.open(task, name, contents, size);
+ gold_assert(ok);
+}
+
+// Return the position dependent options in force for this file.
+
+const Position_dependent_options&
+Input_file::options() const
+{
+ return this->input_argument_->options();
+}
+
+// Return the name given by the user. For -lc this will return "c".
+
+const char*
+Input_file::name() const
+{
+ return this->input_argument_->name();
+}
+
+// Return whether we are only reading symbols.
+
+bool
+Input_file::just_symbols() const
+{
+ return this->input_argument_->just_symbols();
+}
+
+// Open the file.
+
+// If the filename is not absolute, we assume it is in the current
+// directory *except* when:
+// A) input_argument_->is_lib() is true; or
+// B) input_argument_->extra_search_path() is not empty.
+// In both cases, we look in extra_search_path + library_path to find
+// the file location, rather than the current directory.
+
+bool
+Input_file::open(const General_options& options, const Dirsearch& dirpath,
+ const Task* task)
{
std::string name;
- if (!this->input_argument_.is_lib())
- name = this->input_argument_.name();
- else
+
+ // Case 1: name is an absolute file, just try to open it
+ // Case 2: name is relative but is_lib is false and extra_search_path
+ // is empty
+ if (IS_ABSOLUTE_PATH (this->input_argument_->name())
+ || (!this->input_argument_->is_lib()
+ && this->input_argument_->extra_search_path() == NULL))
{
+ name = this->input_argument_->name();
+ this->found_name_ = name;
+ }
+ // Case 3: is_lib is true
+ else if (this->input_argument_->is_lib())
+ {
+ // We don't yet support extra_search_path with -l.
+ gold_assert(this->input_argument_->extra_search_path() == NULL);
std::string n1("lib");
- n1 += this->input_argument_.name();
+ n1 += this->input_argument_->name();
std::string n2;
- if (!options.is_static())
- n2 = n1 + ".so";
- n1 += ".a";
- name = dirpath.find(n1, n2);
+ if (options.is_static()
+ || !this->input_argument_->options().Bdynamic())
+ n1 += ".a";
+ else
+ {
+ n2 = n1 + ".a";
+ n1 += ".so";
+ }
+ name = dirpath.find(n1, n2, &this->is_in_sysroot_);
if (name.empty())
{
- fprintf(stderr, _("%s: cannot find %s\n"), program_name,
- this->input_argument_.name());
- gold_exit(false);
+ gold_error(_("cannot find -l%s"),
+ this->input_argument_->name());
+ return false;
}
+ if (n2.empty() || name[name.length() - 1] == 'o')
+ this->found_name_ = n1;
+ else
+ this->found_name_ = n2;
+ }
+ // Case 4: extra_search_path is not empty
+ else
+ {
+ gold_assert(this->input_argument_->extra_search_path() != NULL);
+
+ // First, check extra_search_path.
+ name = this->input_argument_->extra_search_path();
+ if (!IS_DIR_SEPARATOR (name[name.length() - 1]))
+ name += '/';
+ name += this->input_argument_->name();
+ struct stat dummy_stat;
+ if (::stat(name.c_str(), &dummy_stat) < 0)
+ {
+ // extra_search_path failed, so check the normal search-path.
+ name = dirpath.find(this->input_argument_->name(), "",
+ &this->is_in_sysroot_);
+ if (name.empty())
+ {
+ gold_error(_("cannot find %s"),
+ this->input_argument_->name());
+ return false;
+ }
+ }
+ this->found_name_ = this->input_argument_->name();
}
- if (!this->file_.open(name))
+ // Now that we've figured out where the file lives, try to open it.
+
+ General_options::Object_format format =
+ this->input_argument_->options().format_enum();
+ bool ok;
+ if (format == General_options::OBJECT_FORMAT_ELF)
+ ok = this->file_.open(task, name);
+ else
{
- fprintf(stderr, _("%s: cannot open %s: %s\n"), program_name,
- name.c_str(), strerror(errno));
- gold_exit(false);
+ gold_assert(format == General_options::OBJECT_FORMAT_BINARY);
+ ok = this->open_binary(options, task, name);
}
+
+ if (!ok)
+ {
+ gold_error(_("cannot open %s: %s"),
+ name.c_str(), strerror(errno));
+ return false;
+ }
+
+ return true;
+}
+
+// Open a file for --format binary.
+
+bool
+Input_file::open_binary(const General_options&,
+ const Task* task, const std::string& name)
+{
+ // In order to open a binary file, we need machine code, size, and
+ // endianness. We may not have a valid target at this point, in
+ // which case we use the default target.
+ const Target* target;
+ if (parameters->target_valid())
+ target = ¶meters->target();
+ else
+ target = ¶meters->default_target();
+
+ Binary_to_elf binary_to_elf(target->machine_code(),
+ target->get_size(),
+ target->is_big_endian(),
+ name);
+ if (!binary_to_elf.convert(task))
+ return false;
+ return this->file_.open(task, name, binary_to_elf.converted_data_leak(),
+ binary_to_elf.converted_size());
}
} // End namespace gold.
projects / external / binutils.git / blobdiff