// fileread.cc -- read files for gold
-// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#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 "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 };
+struct iovec { void* iov_base; size_t iov_len; };
ssize_t
readv(int, const iovec*, int)
{
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()
{
gold_assert(!this->is_locked());
- if (!this->mapped_)
- delete[] this->data_;
- else
+ 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));
-
- File_read::current_mapped_bytes -= this->size_;
+ 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();
}
}
// 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;
-
File_read::~File_read()
{
gold_assert(this->token_.is_writable());
this->is_descriptor_opened_ = false;
}
this->name_.clear();
- this->clear_views(true);
+ this->clear_views(CLEAR_VIEWS_ALL);
}
// Open the file.
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->name_.c_str());
this->token_.add_writer(task);
}
&& !this->is_descriptor_opened_
&& this->name_.empty());
this->name_ = name;
- this->contents_ = contents;
+ 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;
{
gold_assert(this->is_locked());
- File_read::total_mapped_bytes += this->mapped_bytes_;
- File_read::current_mapped_bytes += this->mapped_bytes_;
+ 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;
- if (File_read::current_mapped_bytes > File_read::maximum_mapped_bytes)
- File_read::maximum_mapped_bytes = File_read::current_mapped_bytes;
// 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(false);
+ this->clear_views(CLEAR_VIEWS_NORMAL);
if (this->is_descriptor_opened_)
{
release_descriptor(this->descriptor_, false);
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;
}
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);
}
File_read::find_view(off_t start, section_size_type size,
unsigned int byteshift, File_read::View** vshifted) const
{
+ 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;
File_read::do_read(off_t start, section_size_type size, void* p)
{
ssize_t bytes;
- if (this->contents_ != NULL)
+ if (this->whole_file_view_ != NULL)
{
bytes = this->size_ - start;
if (static_cast<section_size_type>(bytes) >= size)
{
- memcpy(p, this->contents_ + start, size);
+ memcpy(p, this->whole_file_view_->data() + start, size);
return;
}
}
else
{
this->reopen_descriptor();
- bytes = ::pread(this->descriptor_, p, size, start);
- if (static_cast<section_size_type>(bytes) == size)
- return;
- if (bytes < 0)
+ char *read_ptr = static_cast<char *>(p);
+ off_t read_pos = start;
+ size_t to_read = size;
+ do
{
- gold_fatal(_("%s: pread failed: %s"),
- this->filename().c_str(), strerror(errno));
- return;
+ 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;
}
gold_fatal(_("%s: file too short: read only %lld of %lld bytes at %lld"),
unsigned int byteshift, bool cache)
{
gold_assert(size > 0);
-
- // 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));
+ gold_assert(start <= this->size_
+ && (static_cast<unsigned long long>(size)
+ <= static_cast<unsigned long long>(this->size_ - start)));
off_t poff = File_read::page_offset(start);
gold_assert(psize >= size);
}
- File_read::View* v;
- if (this->contents_ != NULL || byteshift != 0)
+ void* p;
+ View::Data_ownership ownership;
+ if (byteshift != 0)
{
- unsigned char* p = new unsigned char[psize + byteshift];
+ p = malloc(psize + byteshift);
+ if (p == NULL)
+ gold_nomem();
memset(p, 0, byteshift);
- this->do_read(poff, psize, p + byteshift);
- v = new File_read::View(poff, psize, p, byteshift, cache, false);
+ this->do_read(poff, psize, static_cast<unsigned char*>(p) + byteshift);
+ ownership = View::DATA_ALLOCATED_ARRAY;
}
else
{
this->reopen_descriptor();
- 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, 0, cache, true);
+ 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;
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;
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,
{
gold_assert(aligned);
- unsigned char* pbytes = new unsigned char[v->size() + byteshift];
+ 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, false);
+ 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;
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)
size_t j;
for (j = i + 1; j < count; ++j)
{
- if (j - i >= File_read::max_readv_entries)
+ 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;
{
const Read_multiple_entry& k_entry(rm[k]);
gold_assert((convert_to_section_size_type(k_entry.file_offset
- - i_off)
- + k_entry.size)
+ - i_off)
+ + k_entry.size)
<= convert_to_section_size_type(end_off
- - i_off));
+ - i_off));
memcpy(k_entry.buffer,
v + (k_entry.file_offset - i_off),
k_entry.size);
// the next object.
void
-File_read::clear_views(bool destroying)
+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())
+ if (p->second->is_locked() || p->second->is_permanent_view())
should_delete = false;
- else if (destroying)
+ else if (mode == CLEAR_VIEWS_ALL)
should_delete = true;
- else if (p->second->should_cache())
+ 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())
+ 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
}
else
{
- gold_assert(!destroying);
p->second->clear_accessed();
++p;
}
}
else
{
- gold_assert(!destroying);
+ gold_assert(mode != CLEAR_VIEWS_ALL);
++q;
}
}
// Class Input_file.
+// 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,
{
this->input_argument_ =
new Input_file_argument(name, Input_file_argument::INPUT_FILE_TYPE_FILE,
- "", false, Position_dependent_options());
+ "", false, Position_dependent_options());
bool ok = this->file_.open(task, name, contents, size);
gold_assert(ok);
}
{
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));
- // TODO: do a configure check if st_mtim is present and get the
- // nanoseconds part if it is.
+#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
}
-// Open the file.
+// 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;
// the file location, rather than the current directory.
bool
-Input_file::open(const Dirsearch& dirpath, const Task* task, int *pindex)
+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;
// 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(this->input_argument_->name())
- || (!this->input_argument_->is_lib()
- && !this->input_argument_->is_searched_file()
- && this->input_argument_->extra_search_path() == NULL))
+ if (IS_ABSOLUTE_PATH(input_argument->name())
+ || (!input_argument->is_lib()
+ && !input_argument->is_searched_file()
+ && input_argument->extra_search_path() == NULL))
{
- name = this->input_argument_->name();
- this->found_name_ = name;
+ 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 (this->input_argument_->is_lib()
- || this->input_argument_->is_searched_file())
+ else if (input_argument->is_lib()
+ || input_argument->is_searched_file())
{
- // We don't yet support extra_search_path with -l.
- gold_assert(this->input_argument_->extra_search_path() == NULL);
- std::string n1, n2;
- if (this->input_argument_->is_lib())
+ std::vector<std::string> names;
+ names.reserve(2);
+ if (input_argument->is_lib())
{
- n1 = "lib";
- n1 += this->input_argument_->name();
+ std::string prefix = "lib";
+ prefix += input_argument->name();
if (parameters->options().is_static()
- || !this->input_argument_->options().Bdynamic())
- n1 += ".a";
+ || !input_argument->options().Bdynamic())
+ names.push_back(prefix + ".a");
else
{
- n2 = n1 + ".a";
- n1 += ".so";
+ names.push_back(prefix + ".so");
+ names.push_back(prefix + ".a");
}
}
else
- n1 = this->input_argument_->name();
- name = dirpath.find(n1, n2, &this->is_in_sysroot_, pindex);
+ 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"),
- this->input_argument_->is_lib() ? "-l" : "",
- this->input_argument_->name());
+ input_argument->is_lib() ? "-l" : "",
+ input_argument->name());
return false;
}
- if (n2.empty() || name[name.length() - 1] == 'o')
- this->found_name_ = n1;
- else
- this->found_name_ = n2;
+ *namep = name;
+ return true;
}
// 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 (*pindex > 0 || ::stat(name.c_str(), &dummy_stat) < 0)
- {
- // extra_search_path failed, so check the normal search-path.
- int index = *pindex;
- if (index > 0)
- --index;
- name = dirpath.find(this->input_argument_->name(), "",
- &this->is_in_sysroot_, &index);
- if (name.empty())
- {
- gold_error(_("cannot find %s"),
- this->input_argument_->name());
- return false;
- }
- *pindex = index + 1;
- }
- this->found_name_ = this->input_argument_->name();
+ 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())
+ {
+ 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.
this->input_argument_->options().format_enum();
bool ok;
if (format == General_options::OBJECT_FORMAT_ELF)
- ok = this->file_.open(task, name);
+ {
+ 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 (!ok)
{
gold_error(_("cannot open %s: %s"),
name.c_str(), strerror(errno));
+ this->format_ = FORMAT_NONE;
return false;
}
projects / deliverable / binutils-gdb.git / blobdiff