/*
- * Copyright 2016 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* limitations under the License.
*/
-#ifndef FOLLY_SYMBOLIZER_ELFCACHE_H_
-#define FOLLY_SYMBOLIZER_ELFCACHE_H_
+#pragma once
+#include <climits> // for PATH_MAX
#include <cstring>
-#include <limits.h> // for PATH_MAX
#include <memory>
#include <mutex>
#include <string>
-#include <vector>
#include <unordered_map>
+#include <vector>
-#include <boost/operators.hpp>
#include <boost/container/flat_map.hpp>
#include <boost/intrusive/list.hpp>
+#include <boost/operators.hpp>
#include <glog/logging.h>
+#include <folly/Hash.h>
+#include <folly/Range.h>
#include <folly/experimental/symbolizer/Elf.h>
-namespace folly { namespace symbolizer {
+namespace folly {
+namespace symbolizer {
+
+/**
+ * Number of ELF files loaded by the dynamic loader.
+ */
+size_t countLoadedElfFiles();
class ElfCacheBase {
public:
virtual std::shared_ptr<ElfFile> getFile(StringPiece path) = 0;
- virtual ~ElfCacheBase() { }
+ virtual ~ElfCacheBase() {}
};
/**
// own wrapper around a fixed-size, null-terminated string.
class Path : private boost::totally_ordered<Path> {
public:
+ Path() {
+ assign(folly::StringPiece());
+ }
+
explicit Path(StringPiece s) {
+ assign(s);
+ }
+
+ void assign(StringPiece s) {
DCHECK_LE(s.size(), kMaxSize);
- memcpy(data_, s.data(), s.size());
+ if (!s.empty()) {
+ memcpy(data_, s.data(), s.size());
+ }
data_[s.size()] = '\0';
}
char data_[kMaxSize + 1];
};
+ Path scratchpad_; // Preallocated key for map_ lookups.
boost::container::flat_map<Path, int> map_;
std::vector<std::shared_ptr<ElfFile>> slots_;
};
static std::shared_ptr<ElfFile> filePtr(const std::shared_ptr<Entry>& e);
size_t capacity_;
- std::unordered_map<
- StringPiece,
- std::shared_ptr<Entry>,
- StringPieceHash> files_;
+ std::unordered_map<StringPiece, std::shared_ptr<Entry>, Hash> files_;
typedef boost::intrusive::list<
Entry,
boost::intrusive::member_hook<Entry, LruLink, &Entry::lruLink>,
- boost::intrusive::constant_time_size<false>> LruList;
+ boost::intrusive::constant_time_size<false>>
+ LruList;
LruList lruList_;
};
-
-}} // namespaces
-
-#endif /* FOLLY_SYMBOLIZER_ELFCACHE_H_ */
+} // namespace symbolizer
+} // namespace folly