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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_PROFILER_STRINGS_STORAGE_H_
#define V8_PROFILER_STRINGS_STORAGE_H_
#include <stdarg.h>
#include "src/base/compiler-specific.h"
#include "src/base/hashmap.h"
#include "src/base/platform/mutex.h"
#include "src/common/globals.h"
namespace v8 {
namespace internal {
class Name;
class Symbol;
// Provides a storage of strings allocated in C++ heap, to hold them
// forever, even if they disappear from JS heap or external storage.
class V8_EXPORT_PRIVATE StringsStorage {
public:
StringsStorage();
~StringsStorage();
StringsStorage(const StringsStorage&) = delete;
StringsStorage& operator=(const StringsStorage&) = delete;
// Copies the given c-string and stores it, returning the stored copy, or just
// returns the existing string in storage if it already exists.
const char* GetCopy(const char* src);
// Returns a formatted string, de-duplicated via the storage.
PRINTF_FORMAT(2, 3) const char* GetFormatted(const char* format, ...);
// Returns a stored string resulting from name, or "<symbol>" for a symbol.
const char* GetName(Name name);
// Returns the string representation of the int from the store.
const char* GetName(int index);
// Appends string resulting from name to prefix, then returns the stored
// result.
const char* GetConsName(const char* prefix, Name name);
// Reduces the refcount of the given string, freeing it if no other
// references are made to it. Returns true if the string was successfully
// unref'd, or false if the string was not present in the table.
bool Release(const char* str);
// Returns the number of strings in the store.
size_t GetStringCountForTesting() const;
// Returns the size of strings in the store
size_t GetStringSize();
// Returns true if the strings table is empty.
bool empty() const { return names_.occupancy() == 0; }
private:
static bool StringsMatch(void* key1, void* key2);
// Adds the string to storage and returns it, or if a matching string exists
// in the storage, deletes str and returns the matching string instead.
const char* AddOrDisposeString(char* str, int len);
base::CustomMatcherHashMap::Entry* GetEntry(const char* str, int len);
PRINTF_FORMAT(2, 0)
const char* GetVFormatted(const char* format, va_list args);
const char* GetSymbol(Symbol sym);
base::CustomMatcherHashMap names_;
base::Mutex mutex_;
size_t string_size_ = 0;
};
} // namespace internal
} // namespace v8
#endif // V8_PROFILER_STRINGS_STORAGE_H_
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