// fileread.cc -- read files for gold
+// Copyright (C) 2006-2020 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 <climits>
#include <fcntl.h>
#include <unistd.h>
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+#ifdef HAVE_READV
+#include <sys/uio.h>
+#endif
+
+#include <sys/stat.h>
+#include "filenames.h"
+
+#include "debug.h"
+#include "parameters.h"
#include "options.h"
#include "dirsearch.h"
+#include "target.h"
+#include "binary.h"
+#include "descriptors.h"
+#include "gold-threads.h"
#include "fileread.h"
+// For systems without mmap support.
+#ifndef HAVE_MMAP
+# define mmap gold_mmap
+# define munmap gold_munmap
+# ifndef MAP_FAILED
+# define MAP_FAILED (reinterpret_cast<void*>(-1))
+# endif
+# ifndef PROT_READ
+# define PROT_READ 0
+# endif
+# ifndef MAP_PRIVATE
+# define MAP_PRIVATE 0
+# endif
+
+# ifndef ENOSYS
+# define ENOSYS EINVAL
+# endif
+
+static void *
+gold_mmap(void *, size_t, int, int, int, off_t)
+{
+ errno = ENOSYS;
+ return MAP_FAILED;
+}
+
+static int
+gold_munmap(void *, size_t)
+{
+ errno = ENOSYS;
+ return -1;
+}
+
+#endif
+
+#ifndef HAVE_READV
+struct iovec { void* iov_base; size_t iov_len; };
+ssize_t
+readv(int, const iovec*, int)
+{
+ gold_unreachable();
+}
+#endif
+
namespace gold
{
+// Get the last modified time of an unopened file.
+
+bool
+get_mtime(const char* filename, Timespec* mtime)
+{
+ struct stat file_stat;
+
+ if (stat(filename, &file_stat) < 0)
+ return false;
+#ifdef HAVE_STAT_ST_MTIM
+ mtime->seconds = file_stat.st_mtim.tv_sec;
+ mtime->nanoseconds = file_stat.st_mtim.tv_nsec;
+#else
+ mtime->seconds = file_stat.st_mtime;
+ mtime->nanoseconds = 0;
+#endif
+ return true;
+}
+
+// Class File_read.
+
+// A lock for the File_read static variables.
+static Lock* file_counts_lock = NULL;
+static Initialize_lock file_counts_initialize_lock(&file_counts_lock);
+
+// 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;
+
// Class File_read::View.
File_read::View::~View()
{
- assert(!this->is_locked());
- delete[] this->data_;
+ gold_assert(!this->is_locked());
+ switch (this->data_ownership_)
+ {
+ case DATA_ALLOCATED_ARRAY:
+ free(const_cast<unsigned char*>(this->data_));
+ break;
+ case DATA_MMAPPED:
+ if (::munmap(const_cast<unsigned char*>(this->data_), this->size_) != 0)
+ gold_warning(_("munmap failed: %s"), strerror(errno));
+ if (!parameters->options_valid() || parameters->options().stats())
+ {
+ file_counts_initialize_lock.initialize();
+ Hold_optional_lock hl(file_counts_lock);
+ File_read::current_mapped_bytes -= this->size_;
+ }
+ break;
+ case DATA_NOT_OWNED:
+ break;
+ default:
+ gold_unreachable();
+ }
}
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 class is designed to support file descriptor caching,
-// but this is not currently implemented.
-
File_read::~File_read()
{
- assert(this->lock_count_ == 0);
- if (this->descriptor_ >= 0)
+ gold_assert(this->token_.is_writable());
+ if (this->is_descriptor_opened_)
{
- if (close(this->descriptor_) < 0)
- fprintf(stderr, _("%s: warning: close(%s) failed: %s"),
- program_name, this->name_.c_str(), strerror(errno));
+ release_descriptor(this->descriptor_, true);
this->descriptor_ = -1;
+ this->is_descriptor_opened_ = false;
}
this->name_.clear();
- this->clear_views(true);
+ this->clear_views(CLEAR_VIEWS_ALL);
}
+// 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->is_descriptor_opened_
+ && this->name_.empty());
this->name_ = name;
- this->descriptor_ = ::open(this->name_.c_str(), O_RDONLY);
- ++this->lock_count_;
+
+ this->descriptor_ = open_descriptor(-1, this->name_.c_str(),
+ O_RDONLY);
+
+ if (this->descriptor_ >= 0)
+ {
+ this->is_descriptor_opened_ = true;
+ 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;
+ gold_debug(DEBUG_FILES, "Attempt to open %s succeeded",
+ this->name_.c_str());
+ 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)
{
- assert(this->lock_count_ > 0);
- return this->descriptor_;
+ gold_assert(this->token_.is_writable()
+ && this->descriptor_ < 0
+ && !this->is_descriptor_opened_
+ && this->name_.empty());
+ this->name_ = name;
+ this->whole_file_view_ = new View(0, size, contents, 0, false,
+ View::DATA_NOT_OWNED);
+ this->add_view(this->whole_file_view_);
+ this->size_ = size;
+ this->token_.add_writer(task);
+ return true;
}
+// Reopen a descriptor if necessary.
+
void
-File_read::lock()
+File_read::reopen_descriptor()
{
- ++this->lock_count_;
+ if (!this->is_descriptor_opened_)
+ {
+ this->descriptor_ = open_descriptor(this->descriptor_,
+ this->name_.c_str(),
+ O_RDONLY);
+ if (this->descriptor_ < 0)
+ gold_fatal(_("could not reopen file %s"), this->name_.c_str());
+ this->is_descriptor_opened_ = true;
+ }
}
+// Release the file. This is called when we are done with the file in
+// a Task.
+
void
-File_read::unlock()
+File_read::release()
{
- assert(this->lock_count_ > 0);
- --this->lock_count_;
+ gold_assert(this->is_locked());
+
+ if (!parameters->options_valid() || parameters->options().stats())
+ {
+ file_counts_initialize_lock.initialize();
+ Hold_optional_lock hl(file_counts_lock);
+ File_read::total_mapped_bytes += this->mapped_bytes_;
+ File_read::current_mapped_bytes += this->mapped_bytes_;
+ if (File_read::current_mapped_bytes > File_read::maximum_mapped_bytes)
+ File_read::maximum_mapped_bytes = File_read::current_mapped_bytes;
+ }
+
+ this->mapped_bytes_ = 0;
+
+ // Only clear views if there is only one attached object. Otherwise
+ // we waste time trying to clear cached archive views. Similarly
+ // for releasing the descriptor.
+ if (this->object_count_ <= 1)
+ {
+ this->clear_views(CLEAR_VIEWS_NORMAL);
+ if (this->is_descriptor_opened_)
+ {
+ release_descriptor(this->descriptor_, false);
+ this->is_descriptor_opened_ = false;
+ }
+ }
+
+ this->released_ = true;
+}
+
+// Lock the file.
+
+void
+File_read::lock(const Task* task)
+{
+ gold_assert(this->released_);
+ gold_debug(DEBUG_FILES, "Locking file \"%s\"", this->name_.c_str());
+ this->token_.add_writer(task);
+ this->released_ = false;
+}
+
+// Unlock the file.
+
+void
+File_read::unlock(const Task* task)
+{
+ gold_debug(DEBUG_FILES, "Unlocking file \"%s\"", this->name_.c_str());
+ 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.
+// If BYTESHIFT is not -1U, the returned View must have the specified
+// byte shift; otherwise, it may have any byte shift. If VSHIFTED is
+// not NULL, this sets *VSHIFTED to a view which would have worked if
+// not for the requested BYTESHIFT.
-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,
+ unsigned int byteshift, File_read::View** vshifted) const
{
- for (std::list<File_read::View*>::iterator p = this->view_list_.begin();
- p != this->view_list_.end();
- ++p)
+ gold_assert(start <= this->size_
+ && (static_cast<unsigned long long>(size)
+ <= static_cast<unsigned long long>(this->size_ - start)));
+
+ if (vshifted != NULL)
+ *vshifted = NULL;
+
+ // If we have the whole file mmapped, and the alignment is right,
+ // we can return it.
+ if (this->whole_file_view_)
+ if (byteshift == -1U || byteshift == 0)
+ return this->whole_file_view_;
+
+ off_t page = File_read::page_offset(start);
+
+ unsigned int bszero = 0;
+ Views::const_iterator p = this->views_.upper_bound(std::make_pair(page - 1,
+ bszero));
+
+ while (p != this->views_.end() && p->first.first <= page)
{
- if ((*p)->start() <= start
- && (*p)->start() + (*p)->size() >= start + size)
- return *p;
+ if (p->second->start() <= start
+ && (p->second->start() + static_cast<off_t>(p->second->size())
+ >= start + static_cast<off_t>(size)))
+ {
+ if (byteshift == -1U || byteshift == p->second->byteshift())
+ {
+ p->second->set_accessed();
+ return p->second;
+ }
+
+ if (vshifted != NULL && *vshifted == NULL)
+ *vshifted = p->second;
+ }
+
+ ++p;
}
+
return NULL;
}
-// 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)
{
- assert(this->lock_count_ > 0);
- int o = this->descriptor_;
-
- if (lseek(o, start, SEEK_SET) < 0)
+ ssize_t bytes;
+ if (this->whole_file_view_ != 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->whole_file_view_->data() + 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);
+ this->reopen_descriptor();
+
+ char *read_ptr = static_cast<char *>(p);
+ off_t read_pos = start;
+ size_t to_read = size;
+ do
+ {
+ bytes = ::pread(this->descriptor_, read_ptr, to_read, read_pos);
+ if (bytes < 0)
+ gold_fatal(_("%s: pread failed: %s"),
+ this->filename().c_str(), strerror(errno));
+
+ read_pos += bytes;
+ read_ptr += bytes;
+ to_read -= bytes;
+ if (to_read == 0)
+ return;
+ }
+ while (bytes > 0);
+
+ bytes = size - to_read;
}
- if (pbytes != NULL)
- *pbytes = bytes;
- else if (bytes != size)
+ 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, section_size_type size, void* p)
+{
+ const File_read::View* pv = this->find_view(start, size, -1U, NULL);
+ if (pv != NULL)
{
- 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);
+ memcpy(p, pv->data() + (start - pv->start() + pv->byteshift()), size);
+ return;
}
- return bytes;
+ this->do_read(start, size, p);
}
+// Add a new view. There may already be an existing view at this
+// offset. If there is, the new view will be larger, and should
+// replace the old view.
+
void
-File_read::read(off_t start, off_t size, void* p, off_t* pbytes)
+File_read::add_view(File_read::View* v)
{
- assert(this->lock_count_ > 0);
+ std::pair<Views::iterator, bool> ins =
+ this->views_.insert(std::make_pair(std::make_pair(v->start(),
+ v->byteshift()),
+ v));
+ if (ins.second)
+ return;
- File_read::View* pv = this->find_view(start, size);
- if (pv != NULL)
+ // 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; we put it on a list to be deleted when the file is unlocked.
+ File_read::View* vold = ins.first->second;
+ gold_assert(vold->size() < v->size());
+ if (vold->should_cache())
{
- memcpy(p, pv->data() + (start - pv->start()), size);
- if (pbytes != NULL)
- *pbytes = size;
- return;
+ v->set_cache();
+ vold->clear_cache();
}
+ this->saved_views_.push_back(vold);
- this->do_read(start, size, p, pbytes);
+ ins.first->second = v;
}
-// Find an existing view or make a new one.
+// Make a new view with a specified byteshift, reading the data from
+// the file.
File_read::View*
-File_read::find_or_make_view(off_t start, off_t size, off_t* pbytes)
+File_read::make_view(off_t start, section_size_type size,
+ unsigned int byteshift, bool cache)
{
- assert(this->lock_count_ > 0);
+ gold_assert(size > 0);
+ gold_assert(start <= this->size_
+ && (static_cast<unsigned long long>(size)
+ <= static_cast<unsigned long long>(this->size_ - start)));
- File_read::View* pv = this->find_view(start, size);
- if (pv != NULL)
- return pv;
+ off_t poff = File_read::page_offset(start);
+
+ section_size_type psize = File_read::pages(size + (start - poff));
- 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;
+ if (poff + static_cast<off_t>(psize) >= this->size_)
+ {
+ psize = this->size_ - poff;
+ gold_assert(psize >= size);
+ }
+
+ void* p;
+ View::Data_ownership ownership;
+ if (byteshift != 0)
+ {
+ p = malloc(psize + byteshift);
+ if (p == NULL)
+ gold_nomem();
+ memset(p, 0, byteshift);
+ this->do_read(poff, psize, static_cast<unsigned char*>(p) + byteshift);
+ ownership = View::DATA_ALLOCATED_ARRAY;
+ }
+ else
+ {
+ this->reopen_descriptor();
+ p = ::mmap(NULL, psize, PROT_READ, MAP_PRIVATE, this->descriptor_, poff);
+ if (p != MAP_FAILED)
+ {
+ ownership = View::DATA_MMAPPED;
+ this->mapped_bytes_ += psize;
+ }
+ else
+ {
+ p = malloc(psize);
+ if (p == NULL)
+ gold_nomem();
+ this->do_read(poff, psize, p);
+ ownership = View::DATA_ALLOCATED_ARRAY;
+ }
+ }
+
+ const unsigned char* pbytes = static_cast<const unsigned char*>(p);
+ File_read::View* v = new File_read::View(poff, psize, pbytes, byteshift,
+ cache, ownership);
+
+ this->add_view(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.
+// Find a View or make a new one, shifted as required by the file
+// offset OFFSET and ALIGNED.
+
+File_read::View*
+File_read::find_or_make_view(off_t offset, off_t start,
+ section_size_type size, bool aligned, bool cache)
+{
+ // Check that start and end of the view are within the file.
+ if (start > this->size_
+ || (static_cast<unsigned long long>(size)
+ > static_cast<unsigned long long>(this->size_ - start)))
+ gold_fatal(_("%s: attempt to map %lld bytes at offset %lld exceeds "
+ "size of file; the file may be corrupt"),
+ this->filename().c_str(),
+ static_cast<long long>(size),
+ static_cast<long long>(start));
+
+ unsigned int byteshift;
+ if (offset == 0)
+ byteshift = 0;
+ else
+ {
+ unsigned int target_size = (!parameters->target_valid()
+ ? 64
+ : parameters->target().get_size());
+ byteshift = offset & ((target_size / 8) - 1);
+
+ // Set BYTESHIFT to the number of dummy bytes which must be
+ // inserted before the data in order for this data to be
+ // aligned.
+ if (byteshift != 0)
+ byteshift = (target_size / 8) - byteshift;
+ }
+
+ // If --map-whole-files is set, make sure we have a
+ // whole file view. Options may not yet be ready, e.g.,
+ // when reading a version script. We then default to
+ // --no-map-whole-files.
+ if (this->whole_file_view_ == NULL
+ && parameters->options_valid()
+ && parameters->options().map_whole_files())
+ this->whole_file_view_ = this->make_view(0, this->size_, 0, cache);
+
+ // Try to find a View with the required BYTESHIFT.
+ File_read::View* vshifted;
+ File_read::View* v = this->find_view(offset + start, size,
+ aligned ? byteshift : -1U,
+ &vshifted);
+ if (v != NULL)
+ {
+ if (cache)
+ v->set_cache();
+ return v;
+ }
+
+ // If VSHIFTED is not NULL, then it has the data we need, but with
+ // the wrong byteshift.
+ v = vshifted;
+ if (v != NULL)
+ {
+ gold_assert(aligned);
+
+ unsigned char* pbytes;
+ pbytes = static_cast<unsigned char*>(malloc(v->size() + byteshift));
+ if (pbytes == NULL)
+ gold_nomem();
+ memset(pbytes, 0, byteshift);
+ memcpy(pbytes + byteshift, v->data() + v->byteshift(), v->size());
+
+ File_read::View* shifted_view =
+ new File_read::View(v->start(), v->size(), pbytes, byteshift,
+ cache, View::DATA_ALLOCATED_ARRAY);
+
+ this->add_view(shifted_view);
+ return shifted_view;
+ }
+
+ // Make a new view. If we don't need an aligned view, use a
+ // byteshift of 0, so that we can use mmap.
+ return this->make_view(offset + start, size,
+ aligned ? byteshift : 0,
+ cache);
+}
+
+// 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 offset, off_t start, section_size_type size,
+ bool aligned, bool cache)
{
- assert(this->lock_count_ > 0);
- File_read::View* pv = this->find_or_make_view(start, size, pbytes);
- return pv->data() + (start - pv->start());
+ File_read::View* pv = this->find_or_make_view(offset, start, size,
+ aligned, cache);
+ return pv->data() + (offset + start - pv->start() + pv->byteshift());
}
File_view*
-File_read::get_lasting_view(off_t start, off_t size, off_t* pbytes)
+File_read::get_lasting_view(off_t offset, off_t start, section_size_type size,
+ bool aligned, 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(offset, start, size,
+ aligned, cache);
pv->lock();
- return new File_view(*this, pv, pv->data() + (start - pv->start()));
+ return new File_view(*this, pv,
+ (pv->data()
+ + (offset + start - pv->start() + pv->byteshift())));
}
-// 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::clear_views(bool destroying)
+File_read::do_readv(off_t base, const Read_multiple& rm, size_t start,
+ size_t count)
{
- std::list<File_read::View*>::iterator p = this->view_list_.begin();
- while (p != this->view_list_.end())
+ 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)
{
- if ((*p)->is_locked())
+ const Read_multiple_entry& i_entry(rm[start + i]);
+
+ if (i_entry.file_offset > last_offset)
{
- assert(!destroying);
+ 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;
+ }
+
+ this->reopen_descriptor();
+
+ 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));
+}
+
+// Portable IOV_MAX.
+
+#if !defined(HAVE_READV)
+#define GOLD_IOV_MAX 1
+#elif defined(IOV_MAX)
+#define GOLD_IOV_MAX IOV_MAX
+#else
+#define GOLD_IOV_MAX (File_read::max_readv_entries * 2)
+#endif
+
+// Read several pieces of data from the file.
+
+void
+File_read::read_multiple(off_t base, const Read_multiple& rm)
+{
+ static size_t iov_max = GOLD_IOV_MAX;
+ 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 || j - i >= iov_max / 2)
+ 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,
+ -1U, NULL);
+ if (view == NULL)
+ this->do_readv(base, rm, i, j - i);
+ else
+ {
+ const unsigned char* v = (view->data()
+ + (base + i_off - view->start()
+ + view->byteshift()));
+ 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(Clear_views_mode mode)
+{
+ bool keep_files_mapped = (parameters->options_valid()
+ && parameters->options().keep_files_mapped());
+ Views::iterator p = this->views_.begin();
+ while (p != this->views_.end())
+ {
+ bool should_delete;
+ if (p->second->is_locked() || p->second->is_permanent_view())
+ should_delete = false;
+ else if (mode == CLEAR_VIEWS_ALL)
+ should_delete = true;
+ else if ((p->second->should_cache()
+ || p->second == this->whole_file_view_)
+ && keep_files_mapped)
+ should_delete = false;
+ else if (this->object_count_ > 1
+ && p->second->accessed()
+ && mode != CLEAR_VIEWS_ARCHIVE)
+ should_delete = false;
+ else
+ should_delete = true;
+
+ if (should_delete)
+ {
+ if (p->second == this->whole_file_view_)
+ this->whole_file_view_ = NULL;
+ delete p->second;
+
+ // map::erase invalidates only the iterator to the deleted
+ // element.
+ Views::iterator pe = p;
++p;
+ this->views_.erase(pe);
+ }
+ else
+ {
+ 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(mode != CLEAR_VIEWS_ALL);
+ ++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 given just the filename.
+
+Input_file::Input_file(const char* name)
+ : found_name_(), file_(), is_in_sysroot_(false), format_(FORMAT_NONE)
+{
+ this->input_argument_ =
+ new Input_file_argument(name, Input_file_argument::INPUT_FILE_TYPE_FILE,
+ "", false, Position_dependent_options());
+}
+
+// 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, Input_file_argument::INPUT_FILE_TYPE_FILE,
+ "", false, Position_dependent_options());
+ bool ok = this->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 this file is in a system directory.
+
+bool
+Input_file::is_in_system_directory() const
+{
+ if (this->is_in_sysroot())
+ return true;
+ return parameters->options().is_in_system_directory(this->filename());
+}
+
+// Return whether we are only reading symbols.
+
+bool
+Input_file::just_symbols() const
+{
+ return this->input_argument_->just_symbols();
+}
+
+// Return whether this is a file that we will search for in the list
+// of directories.
+
+bool
+Input_file::will_search_for() const
+{
+ return (!IS_ABSOLUTE_PATH(this->input_argument_->name())
+ && (this->input_argument_->is_lib()
+ || this->input_argument_->is_searched_file()
+ || this->input_argument_->extra_search_path() != NULL));
+}
+
+// Return the file last modification time. Calls gold_fatal if the stat
+// system call failed.
+
+Timespec
+File_read::get_mtime()
+{
+ struct stat file_stat;
+ this->reopen_descriptor();
+
+ if (fstat(this->descriptor_, &file_stat) < 0)
+ gold_fatal(_("%s: stat failed: %s"), this->name_.c_str(),
+ strerror(errno));
+#ifdef HAVE_STAT_ST_MTIM
+ return Timespec(file_stat.st_mtim.tv_sec, file_stat.st_mtim.tv_nsec);
+#else
+ return Timespec(file_stat.st_mtime, 0);
+#endif
+}
+
+// Try to find a file in the extra search dirs. Returns true on success.
+
+bool
+Input_file::try_extra_search_path(int* pindex,
+ const Input_file_argument* input_argument,
+ std::string filename, std::string* found_name,
+ std::string* namep)
+{
+ if (input_argument->extra_search_path() == NULL)
+ return false;
+
+ std::string name = input_argument->extra_search_path();
+ if (!IS_DIR_SEPARATOR(name[name.length() - 1]))
+ name += '/';
+ name += filename;
+
+ struct stat dummy_stat;
+ if (*pindex > 0 || ::stat(name.c_str(), &dummy_stat) < 0)
+ return false;
+
+ *found_name = filename;
+ *namep = name;
+ return true;
+}
+
+// Find the actual file.
+// If the filename is not absolute, we assume it is in the current
+// directory *except* when:
+// A) input_argument_->is_lib() is true;
+// B) input_argument_->is_searched_file() is true; or
+// C) input_argument_->extra_search_path() is not empty.
+// In each, we look in extra_search_path + library_path to find
+// the file location, rather than the current directory.
+
+bool
+Input_file::find_file(const Dirsearch& dirpath, int* pindex,
+ const Input_file_argument* input_argument,
+ bool* is_in_sysroot,
+ std::string* found_name, std::string* namep)
{
std::string name;
- if (!this->input_argument_.is_lib())
- name = this->input_argument_.name();
+
+ // Case 1: name is an absolute file, just try to open it
+ // Case 2: name is relative but is_lib is false, is_searched_file is false,
+ // and extra_search_path is empty
+ if (IS_ABSOLUTE_PATH(input_argument->name())
+ || (!input_argument->is_lib()
+ && !input_argument->is_searched_file()
+ && input_argument->extra_search_path() == NULL))
+ {
+ name = input_argument->name();
+ *found_name = name;
+ *namep = name;
+ return true;
+ }
+ // Case 3: is_lib is true or is_searched_file is true
+ else if (input_argument->is_lib()
+ || input_argument->is_searched_file())
+ {
+ std::vector<std::string> names;
+ names.reserve(2);
+ if (input_argument->is_lib())
+ {
+ std::string prefix = "lib";
+ prefix += input_argument->name();
+ if (parameters->options().is_static()
+ || !input_argument->options().Bdynamic())
+ names.push_back(prefix + ".a");
+ else
+ {
+ names.push_back(prefix + ".so");
+ names.push_back(prefix + ".a");
+ }
+ }
+ else
+ names.push_back(input_argument->name());
+
+ for (std::vector<std::string>::const_iterator n = names.begin();
+ n != names.end();
+ ++n)
+ if (Input_file::try_extra_search_path(pindex, input_argument, *n,
+ found_name, namep))
+ return true;
+
+ // It is not in the extra_search_path.
+ name = dirpath.find(names, is_in_sysroot, pindex, found_name);
+ if (name.empty())
+ {
+ gold_error(_("cannot find %s%s"),
+ input_argument->is_lib() ? "-l" : "",
+ input_argument->name());
+ return false;
+ }
+ *namep = name;
+ return true;
+ }
+ // Case 4: extra_search_path is not empty
else
{
- std::string n1("lib");
- n1 += this->input_argument_.lib_basename();
- std::string n2;
- if (options.is_static())
- n2 = n1 + ".so";
- n1 += ".a";
- name = dirpath.find(n1, n2);
+ gold_assert(input_argument->extra_search_path() != NULL);
+
+ if (try_extra_search_path(pindex, input_argument, input_argument->name(),
+ found_name, namep))
+ return true;
+
+ // extra_search_path failed, so check the normal search-path.
+ int index = *pindex;
+ if (index > 0)
+ --index;
+ name = dirpath.find(std::vector<std::string>(1, input_argument->name()),
+ is_in_sysroot, &index, found_name);
if (name.empty())
{
- fprintf(stderr, _("%s: cannot find %s"), program_name,
- this->input_argument_.name());
- gold_exit(false);
+ gold_error(_("cannot find %s"),
+ input_argument->name());
+ return false;
}
+ *namep = name;
+ *pindex = index + 1;
+ return true;
+ }
+}
+
+// Open the file.
+
+bool
+Input_file::open(const Dirsearch& dirpath, const Task* task, int* pindex)
+{
+ std::string name;
+ if (!Input_file::find_file(dirpath, pindex, this->input_argument_,
+ &this->is_in_sysroot_, &this->found_name_, &name))
+ return false;
+
+ // 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);
+ this->format_ = FORMAT_ELF;
+ }
+ else
+ {
+ gold_assert(format == General_options::OBJECT_FORMAT_BINARY);
+ ok = this->open_binary(task, name);
+ this->format_ = FORMAT_BINARY;
}
- if (!this->file_.open(name))
+ if (!ok)
{
- fprintf(stderr, _("%s: cannot open %s: %s"), program_name, name.c_str(),
- strerror(errno));
- gold_exit(false);
+ gold_error(_("cannot open %s: %s"),
+ name.c_str(), strerror(errno));
+ this->format_ = FORMAT_NONE;
+ return false;
}
+
+ return true;
+}
+
+// Open a file for --format binary.
+
+bool
+Input_file::open_binary(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.
+ parameters_force_valid_target();
+ const Target& target(parameters->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 / deliverable / binutils-gdb.git / blobdiff