// 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 "filenames.h"
#include "options.h"
#include "dirsearch.h"
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)
+ fprintf(stderr, _("%s: munmap failed: %s\n"),
+ program_name, strerror(errno));
+ }
}
void
void
File_read::View::unlock()
{
- assert(this->lock_count_ > 0);
+ gold_assert(this->lock_count_ > 0);
--this->lock_count_;
}
File_read::~File_read()
{
- assert(this->lock_count_ == 0);
+ gold_assert(this->lock_count_ == 0);
if (this->descriptor_ >= 0)
{
if (close(this->descriptor_) < 0)
this->clear_views(true);
}
+// Open the file.
+
bool
File_read::open(const std::string& name)
{
- assert(this->lock_count_ == 0
- && this->descriptor_ < 0
- && this->name_.empty());
+ gold_assert(this->lock_count_ == 0
+ && 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;
}
-int
-File_read::get_descriptor()
+// Open the file for testing purposes.
+
+bool
+File_read::open(const std::string& name, const unsigned char* contents,
+ off_t size)
{
- assert(this->lock_count_ > 0);
- return this->descriptor_;
+ gold_assert(this->lock_count_ == 0
+ && this->descriptor_ < 0
+ && this->name_.empty());
+ this->name_ = name;
+ this->contents_ = contents;
+ this->size_ = size;
+ ++this->lock_count_;
+ return true;
}
void
void
File_read::unlock()
{
- assert(this->lock_count_ > 0);
+ gold_assert(this->lock_count_ > 0);
--this->lock_count_;
+ if (this->lock_count_ == 0)
+ this->clear_views(false);
}
bool
// 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*
+inline File_read::View*
File_read::find_view(off_t start, off_t size)
{
- for (std::list<File_read::View*>::iterator p = this->view_list_.begin();
- p != this->view_list_.end();
- ++p)
- {
- if ((*p)->start() <= start
- && (*p)->start() + (*p)->size() >= start + size)
- return *p;
- }
- return NULL;
+ off_t page = File_read::page_offset(start);
+ Views::iterator p = this->views_.find(page);
+ if (p == this->views_.end())
+ return NULL;
+ if (p->second->size() - (start - page) < size)
+ return NULL;
+ 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)
{
- assert(this->lock_count_ > 0);
- int o = this->descriptor_;
+ gold_assert(this->lock_count_ > 0);
- if (lseek(o, start, SEEK_SET) < 0)
+ off_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 (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 (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)
+ {
+ fprintf(stderr, _("%s: %s: pread failed: %s\n"),
+ program_name, this->filename().c_str(), strerror(errno));
+ 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)
{
- assert(this->lock_count_ > 0);
+ gold_assert(this->lock_count_ > 0);
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, off_t size, bool cache)
{
- assert(this->lock_count_ > 0);
+ gold_assert(this->lock_count_ > 0);
- File_read::View* pv = this->find_view(start, size);
- if (pv != NULL)
- return pv;
+ 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.
+ File_read::View* v = ins.first->second;
+ if (v->size() - (start - v->start()) >= size)
+ {
+ if (cache)
+ v->set_cache();
+ return v;
+ }
+
+ // This view is not large enough.
+ this->saved_views_.push_back(v);
+ }
+
+ // 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));
+
+ if (poff + psize >= this->size_)
+ {
+ psize = this->size_ - poff;
+ gold_assert(psize >= size);
+ }
+
+ File_read::View* v;
+
+ 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_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);
+ }
+
+ 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)
{
- assert(this->lock_count_ > 0);
- File_read::View* pv = this->find_or_make_view(start, size, pbytes);
+ gold_assert(this->lock_count_ > 0);
+ 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)
{
- assert(this->lock_count_ > 0);
- File_read::View* pv = this->find_or_make_view(start, size, pbytes);
+ gold_assert(this->lock_count_ > 0);
+ 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()));
}
void
File_read::clear_views(bool destroying)
{
- std::list<File_read::View*>::iterator p = this->view_list_.begin();
- while (p != this->view_list_.end())
+ for (Views::iterator p = this->views_.begin();
+ p != this->views_.end();
+ ++p)
{
- if ((*p)->is_locked())
+ if (!p->second->is_locked()
+ && (destroying || !p->second->should_cache()))
+ delete p->second;
+ else
{
- assert(!destroying);
- ++p;
+ gold_assert(!destroying);
+ this->saved_views_.push_back(p->second);
}
- else
+ }
+ this->views_.clear();
+
+ Saved_views::iterator p = this->saved_views_.begin();
+ while (p != this->saved_views_.end())
+ {
+ if (!(*p)->is_locked()
+ && (destroying || !(*p)->should_cache()))
{
delete *p;
- p = this->view_list_.erase(p);
+ p = this->saved_views_.erase(p);
+ }
+ else
+ {
+ gold_assert(!destroying);
+ ++p;
}
}
}
File_view::~File_view()
{
- assert(this->file_.is_locked());
+ gold_assert(this->file_.is_locked());
this->view_->unlock();
}
// Class Input_file.
+// Create a file for testing.
+
+Input_file::Input_file(const char* name, const unsigned char* contents,
+ off_t size)
+ : file_()
+{
+ this->input_argument_ =
+ new Input_file_argument(name, false, "", Position_dependent_options());
+ bool ok = file_.open(name, contents, size);
+ gold_assert(ok);
+}
+
+// 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.
+
void
Input_file::open(const General_options& options, const Dirsearch& dirpath)
{
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();
+
+ // 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_.lib_basename();
+ n1 += this->input_argument_->name();
std::string n2;
if (options.is_static())
- n2 = n1 + ".so";
- n1 += ".a";
- name = dirpath.find(n1, n2);
+ 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"), program_name,
- this->input_argument_.name());
+ fprintf(stderr, _("%s: cannot find -l%s\n"), program_name,
+ this->input_argument_->name());
gold_exit(false);
}
}
+ // 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())
+ {
+ fprintf(stderr, _("%s: cannot find %s\n"), program_name,
+ this->input_argument_->name());
+ gold_exit(false);
+ }
+ }
+ }
+
+ // Now that we've figured out where the file lives, try to open it.
if (!this->file_.open(name))
{
- fprintf(stderr, _("%s: cannot open %s: %s"), program_name, name.c_str(),
- strerror(errno));
+ fprintf(stderr, _("%s: cannot open %s: %s\n"), program_name,
+ name.c_str(), strerror(errno));
gold_exit(false);
}
}
projects / binutils-gdb.git / blobdiff