binutils-gdb/gold/descriptors.h

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// descriptors.h -- manage file descriptors for gold -*- C++ -*-
* archive.cc (Archive::get_elf_object_for_member): Remove call to File_read::claim_for_plugin. * descriptors.cc (Descriptors::open): Remove reference to is_claimed. (Descriptors::claim_for_plugin): Remove. * descriptors.h (Descriptors::claim_for_plugin): Remove. (Descriptors::is_claimed): Remove. (claim_descriptor_for_plugin): Remove. * fileread.cc (File_read::claim_for_plugin): Remove. * fileread.h (File_read::claim_for_plugin): Remove. (File_read::descriptor): Reopen descriptor if necessary. * plugin.cc (Plugin::load): Add two new APIs to transfer vector. (Plugin_manager::all_symbols_read): Add task parameter. Change all callers. (Plugin_manager::get_input_file): New function. (Plugin_manager::release_input_file): New function. (Pluginobj::Pluginobj): Add filesize parameter and initialize corresponding data member. (Sized_pluginobj::Sized_pluginobj): Add filesize parameter and pass to base constructor. Change all callers. (get_input_file, release_input_file): New functions. (make_sized_plugin_object): Add filesize parameter. Change all callers. * plugin.h (Plugin_manager::Plugin_manager): Initialize task_ member. (Plugin_manager::all_symbols_read): Add task parameter. (Plugin_manager::get_input_file): New function. (Plugin_manager::release_input_file): New function. (Plugin_manager::task_): New data member. (Pluginobj::Pluginobj): Add filesize parameter. (Pluginobj::filename): New function. (Pluginobj::descriptor): New function. (Pluginobj::filesize): New function. (Pluginobj::filesize_): New data member. (Sized_pluginobj::Sized_pluginobj): Add filesize parameter. * readsyms.cc (Read_symbols::do_read_symbols): Remove call to File_read::claim_for_plugin; use Object::unlock to unlock the file. * testsuite/Makefile.am (plugin_test_4): New test case for plugins with archive libraries. * testsuite/Makefile.in: Regenerate. * testsuite/plugin_test.c (struct sym_info): New type. (get_input_file, release_input_file): New static variables. (onload): Capture new transfer vector entries. (claim_file_hook): Stop reading at end of file according to filesize. Factor out parsing of readelf output into separate function. (all_symbols_read_hook): Exercise get_input_file and release_input_file APIs and get the source file name from the symbol table. Convert source file name to corresponding object file name. Print info message when adding new input files. (parse_readelf_line): New function. * testsuite/plugin_test_1.sh: Add checks for new info messages. * testsuite/plugin_test_2.sh: Likewise. * testsuite/plugin_test_3.sh: Likewise. * testsuite/plugin_test_4.sh: New test case.
2009-01-15 02:29:25 +01:00
// Copyright 2008, 2009 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.
#ifndef GOLD_DESCRIPTORS_H
#define GOLD_DESCRIPTORS_H
#include <vector>
#include "gold-threads.h"
namespace gold
{
// This class manages file descriptors for gold.
class Descriptors
{
public:
Descriptors();
// Get a file descriptor for a file. The DESCRIPTOR parameter is
// the descriptor the last time the file was used; this will be -1
// if this is the first time the file is being opened. The NAME,
// FLAGS, and MODE parameters are as for ::open. NAME must be in
// permanent storage. This returns the descriptor to use, which may
// or may not be the same as DESCRIPTOR. If there is an error
// opening the file, this will return -1 with errno set
// appropriately.
int
open(int descriptor, const char* name, int flags, int mode = 0);
// Release the file descriptor DESCRIPTOR. If PERMANENT is true, it
// will be closed, and the caller may not reopen it. If PERMANENT
// is false this doesn't necessarily close the descriptor, but it
// makes it available to be closed; the descriptor must not be used
// again except as an argument to Descriptor::open.
void
release(int descriptor, bool permanent);
private:
// Information kept for a descriptor.
struct Open_descriptor
{
// File name currently associated with descriptor. This is empty
// if none.
const char* name;
// Index of next descriptor on stack of released descriptors.
int stack_next;
// Whether the descriptor is currently in use.
bool inuse;
// Whether this is a write descriptor.
bool is_write;
// Whether the descriptor is on the stack.
bool is_on_stack;
};
bool
close_some_descriptor();
// We need to lock before accessing any fields.
Lock* lock_;
// Used to initialize the lock_ field exactly once.
Initialize_lock initialize_lock_;
// Information for descriptors.
std::vector<Open_descriptor> open_descriptors_;
// Top of stack.
int stack_top_;
// The current number of file descriptors open.
int current_;
// The maximum number of file descriptors we open.
int limit_;
};
// File descriptors are a centralized data structure, and we use a
// global variable rather than passing the data structure into every
// routine that does file I/O.
extern Descriptors descriptors;
inline int
open_descriptor(int descriptor, const char* name, int flags, int mode = 0)
{ return descriptors.open(descriptor, name, flags, mode); }
inline void
release_descriptor(int descriptor, bool permanent)
{ descriptors.release(descriptor, permanent); }
} // End namespace gold.
#endif // !defined(GOLD_DESCRIPTORS_H)