306 lines
7 KiB
C++
306 lines
7 KiB
C++
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// dirsearch.cc -- directory searching for gold
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// Copyright (C) 2006-2022 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#include "gold.h"
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#include <cerrno>
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#include <cstring>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include "debug.h"
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#include "gold-threads.h"
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#include "options.h"
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#include "workqueue.h"
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#include "dirsearch.h"
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namespace
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{
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// Read all the files in a directory.
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class Dir_cache
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{
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public:
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Dir_cache(const char* dirname)
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: dirname_(dirname), files_()
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{ }
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// Read the files in the directory.
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void read_files();
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// Return whether a file (a base name) is present in the directory.
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bool find(const std::string&) const;
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private:
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// We can not copy this class.
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Dir_cache(const Dir_cache&);
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Dir_cache& operator=(const Dir_cache&);
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const char* dirname_;
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Unordered_set<std::string> files_;
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};
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void
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Dir_cache::read_files()
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{
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DIR* d = opendir(this->dirname_);
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if (d == NULL)
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{
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// We ignore directories which do not exist or are actually file
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// names.
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if (errno != ENOENT && errno != ENOTDIR)
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gold::gold_error(_("%s: can not read directory: %s"),
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this->dirname_, strerror(errno));
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return;
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}
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dirent* de;
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while ((de = readdir(d)) != NULL)
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this->files_.insert(std::string(de->d_name));
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if (closedir(d) != 0)
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gold::gold_warning("%s: closedir failed: %s", this->dirname_,
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strerror(errno));
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}
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bool
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Dir_cache::find(const std::string& basename) const
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{
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return this->files_.find(basename) != this->files_.end();
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}
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// A mapping from directory names to caches. A lock permits
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// concurrent update. There is no lock for read operations--some
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// other mechanism must be used to prevent reads from conflicting with
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// writes.
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class Dir_caches
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{
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public:
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Dir_caches()
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: lock_(), caches_()
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{ }
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~Dir_caches() ATTRIBUTE_UNUSED;
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// Add a cache for a directory.
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void add(const char*);
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// Look up a directory in the cache. This much be locked against
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// calls to Add.
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Dir_cache* lookup(const char*) const;
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private:
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// We can not copy this class.
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Dir_caches(const Dir_caches&);
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Dir_caches& operator=(const Dir_caches&);
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typedef Unordered_map<const char*, Dir_cache*> Cache_hash;
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gold::Lock lock_;
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Cache_hash caches_;
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};
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Dir_caches::~Dir_caches()
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{
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for (Cache_hash::iterator p = this->caches_.begin();
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p != this->caches_.end();
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++p)
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delete p->second;
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}
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void
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Dir_caches::add(const char* dirname)
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{
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{
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gold::Hold_lock hl(this->lock_);
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if (this->lookup(dirname) != NULL)
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return;
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}
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Dir_cache* cache = new Dir_cache(dirname);
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cache->read_files();
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{
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gold::Hold_lock hl(this->lock_);
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std::pair<const char*, Dir_cache*> v(dirname, cache);
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std::pair<Cache_hash::iterator, bool> p = this->caches_.insert(v);
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gold_assert(p.second);
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}
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}
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Dir_cache*
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Dir_caches::lookup(const char* dirname) const
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{
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Cache_hash::const_iterator p = this->caches_.find(dirname);
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if (p == this->caches_.end())
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return NULL;
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return p->second;
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}
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// The caches.
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Dir_caches* caches;
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// A Task to read the directory.
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class Dir_cache_task : public gold::Task
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{
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public:
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Dir_cache_task(const char* dir, gold::Task_token& token)
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: dir_(dir), token_(token)
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{ }
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gold::Task_token*
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is_runnable();
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void
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locks(gold::Task_locker*);
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void
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run(gold::Workqueue*);
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std::string
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get_name() const
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{ return std::string("Dir_cache_task ") + this->dir_; }
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private:
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const char* dir_;
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gold::Task_token& token_;
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};
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// We can always run the task to read the directory.
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gold::Task_token*
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Dir_cache_task::is_runnable()
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{
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return NULL;
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}
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// Return the locks to hold. We use a blocker lock to prevent file
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// lookups from starting until the directory contents have been read.
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void
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Dir_cache_task::locks(gold::Task_locker* tl)
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{
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tl->add(this, &this->token_);
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}
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// Run the task--read the directory contents.
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void
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Dir_cache_task::run(gold::Workqueue*)
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{
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caches->add(this->dir_);
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}
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}
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namespace gold
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{
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// Initialize.
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void
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Dirsearch::initialize(Workqueue* workqueue,
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const General_options::Dir_list* directories)
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{
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gold_assert(caches == NULL);
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caches = new Dir_caches;
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this->directories_ = directories;
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this->token_.add_blockers(directories->size());
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for (General_options::Dir_list::const_iterator p = directories->begin();
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p != directories->end();
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++p)
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workqueue->queue(new Dir_cache_task(p->name().c_str(), this->token_));
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}
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// Search for a file. NOTE: we only log failed file-lookup attempts
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// here. Successfully lookups will eventually get logged in
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// File_read::open.
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std::string
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Dirsearch::find(const std::vector<std::string>& names,
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bool* is_in_sysroot, int* pindex,
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std::string *found_name) const
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{
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gold_assert(!this->token_.is_blocked());
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gold_assert(*pindex >= 0);
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for (unsigned int i = static_cast<unsigned int>(*pindex);
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i < this->directories_->size();
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++i)
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{
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const Search_directory* p = &this->directories_->at(i);
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Dir_cache* pdc = caches->lookup(p->name().c_str());
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gold_assert(pdc != NULL);
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for (std::vector<std::string>::const_iterator n = names.begin();
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n != names.end();
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++n)
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{
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if (pdc->find(*n))
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{
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*is_in_sysroot = p->is_in_sysroot();
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*pindex = i;
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*found_name = *n;
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return p->name() + '/' + *n;
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}
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else
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gold_debug(DEBUG_FILES, "Attempt to open %s/%s failed",
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p->name().c_str(), (*n).c_str());
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}
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}
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*pindex = -2;
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return std::string();
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}
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// Search for a file in a directory list. This is a low-level function and
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// therefore can be used before options and parameters are set.
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std::string
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Dirsearch::find_file_in_dir_list(const std::string& name,
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const General_options::Dir_list& directories,
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const std::string& extra_search_dir)
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{
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struct stat buf;
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std::string extra_name = extra_search_dir + '/' + name;
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if (stat(extra_name.c_str(), &buf) == 0)
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return extra_name;
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for (General_options::Dir_list::const_iterator dir = directories.begin();
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dir != directories.end();
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++dir)
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{
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std::string full_name = dir->name() + '/' + name;
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if (stat(full_name.c_str(), &buf) == 0)
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return full_name;
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}
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return name;
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}
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} // End namespace gold.
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