1 // Copyright 2015 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_PROFILER_STRINGS_STORAGE_H_ 6 #define V8_PROFILER_STRINGS_STORAGE_H_ 7 8 #include <stdarg.h> 9 10 #include "src/base/compiler-specific.h" 11 #include "src/base/hashmap.h" 12 #include "src/globals.h" 13 14 namespace v8 { 15 namespace internal { 16 17 class Name; 18 19 // Provides a storage of strings allocated in C++ heap, to hold them 20 // forever, even if they disappear from JS heap or external storage. 21 class V8_EXPORT_PRIVATE StringsStorage { 22 public: 23 StringsStorage(); 24 ~StringsStorage(); 25 26 // Copies the given c-string and stores it, returning the stored copy, or just 27 // returns the existing string in storage if it already exists. 28 const char* GetCopy(const char* src); 29 // Returns a formatted string, de-duplicated via the storage. 30 PRINTF_FORMAT(2, 3) const char* GetFormatted(const char* format, ...); 31 // Returns a stored string resulting from name, or "<symbol>" for a symbol. 32 const char* GetName(Name* name); 33 // Returns the string representation of the int from the store. 34 const char* GetName(int index); 35 // Appends string resulting from name to prefix, then returns the stored 36 // result. 37 const char* GetConsName(const char* prefix, Name* name); 38 39 private: 40 static bool StringsMatch(void* key1, void* key2); 41 // Adds the string to storage and returns it, or if a matching string exists 42 // in the storage, deletes str and returns the matching string instead. 43 const char* AddOrDisposeString(char* str, int len); 44 base::CustomMatcherHashMap::Entry* GetEntry(const char* str, int len); 45 PRINTF_FORMAT(2, 0) 46 const char* GetVFormatted(const char* format, va_list args); 47 48 base::CustomMatcherHashMap names_; 49 50 DISALLOW_COPY_AND_ASSIGN(StringsStorage); 51 }; 52 53 } // namespace internal 54 } // namespace v8 55 56 #endif // V8_PROFILER_STRINGS_STORAGE_H_ 57
