Factor out StringsStorage from CpuProfilesCollection.

Review URL: http://codereview.chromium.org/2769001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4826 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/profile-generator.cc

@@ -86,6 +86,37 @@ void TokenEnumerator::TokenRemoved(Object** token_location) {
 }
 
 
+StringsStorage::StringsStorage()
+    : names_(StringsMatch) {
+}
+
+
+StringsStorage::~StringsStorage() {
+  for (HashMap::Entry* p = names_.Start();
+       p != NULL;
+       p = names_.Next(p)) {
+    DeleteArray(reinterpret_cast<const char*>(p->value));
+  }
+}
+
+
+const char* StringsStorage::GetName(String* name) {
+  if (name->IsString()) {
+    char* c_name =
+        name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL).Detach();
+    HashMap::Entry* cache_entry = names_.Lookup(c_name, name->Hash(), true);
+    if (cache_entry->value == NULL) {
+      // New entry added.
+      cache_entry->value = c_name;
+    } else {
+      DeleteArray(c_name);
+    }
+    return reinterpret_cast<const char*>(cache_entry->value);
+  }
+  return "";
+}
+
+
 const char* CodeEntry::kEmptyNamePrefix = "";
 unsigned CodeEntry::next_call_uid_ = 1;
 
@@ -438,8 +469,7 @@ void CodeMap::Print() {
 
 
 CpuProfilesCollection::CpuProfilesCollection()
-    : function_and_resource_names_(StringsMatch),
-      profiles_uids_(UidsMatch),
+    : profiles_uids_(UidsMatch),
       current_profiles_semaphore_(OS::CreateSemaphore(1)) {
   // Create list of unabridged profiles.
   profiles_by_token_.Add(new List<CpuProfile*>());
@@ -470,11 +500,6 @@ CpuProfilesCollection::~CpuProfilesCollection() {
   profiles_by_token_.Iterate(DeleteProfilesList);
   code_entries_.Iterate(DeleteCodeEntry);
   args_count_names_.Iterate(DeleteArgsCountName);
-  for (HashMap::Entry* p = function_and_resource_names_.Start();
-       p != NULL;
-       p = function_and_resource_names_.Next(p)) {
-    DeleteArray(reinterpret_cast<const char*>(p->value));
-  }
 }
 
 
@@ -666,27 +691,6 @@ CodeEntry* CpuProfilesCollection::NewCodeEntry(int security_token_id) {
 }
 
 
-const char* CpuProfilesCollection::GetName(String* name) {
-  if (name->IsString()) {
-    char* c_name =
-        name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL).Detach();
-    HashMap::Entry* cache_entry =
-        function_and_resource_names_.Lookup(c_name,
-                                            name->Hash(),
-                                            true);
-    if (cache_entry->value == NULL) {
-      // New entry added.
-      cache_entry->value = c_name;
-    } else {
-      DeleteArray(c_name);
-    }
-    return reinterpret_cast<const char*>(cache_entry->value);
-  } else {
-    return "";
-  }
-}
-
-
 const char* CpuProfilesCollection::GetName(int args_count) {
   ASSERT(args_count >= 0);
   if (args_count_names_.length() <= args_count) {

src/profile-generator.h

@@ -56,6 +56,28 @@ class TokenEnumerator {
 };
 
 
+// Provides a storage of strings allocated in C++ heap, to hold them
+// forever, even if they disappear from JS heap or external storage.
+class StringsStorage {
+ public:
+  StringsStorage();
+  ~StringsStorage();
+
+  const char* GetName(String* name);
+
+ private:
+  INLINE(static bool StringsMatch(void* key1, void* key2)) {
+    return strcmp(reinterpret_cast<char*>(key1),
+                  reinterpret_cast<char*>(key2)) == 0;
+  }
+
+  // String::Hash -> const char*
+  HashMap names_;
+
+  DISALLOW_COPY_AND_ASSIGN(StringsStorage);
+};
+
+
 class CodeEntry {
  public:
   explicit INLINE(CodeEntry(int security_token_id));
@@ -258,10 +280,12 @@ class CpuProfilesCollection {
                             String* title,
                             double actual_sampling_rate);
   List<CpuProfile*>* Profiles(int security_token_id);
+  const char* GetName(String* name) {
+    return function_and_resource_names_.GetName(name);
+  }
   CpuProfile* GetProfile(int security_token_id, unsigned uid);
   inline bool is_last_profile();
 
-  const char* GetName(String* name);
   CodeEntry* NewCodeEntry(Logger::LogEventsAndTags tag,
                           String* name, String* resource_name, int line_number);
   CodeEntry* NewCodeEntry(Logger::LogEventsAndTags tag, const char* name);
@@ -280,17 +304,11 @@ class CpuProfilesCollection {
   List<CpuProfile*>* GetProfilesList(int security_token_id);
   int TokenToIndex(int security_token_id);
 
-  INLINE(static bool StringsMatch(void* key1, void* key2)) {
-    return strcmp(reinterpret_cast<char*>(key1),
-                  reinterpret_cast<char*>(key2)) == 0;
-  }
-
   INLINE(static bool UidsMatch(void* key1, void* key2)) {
     return key1 == key2;
   }
 
-  // String::Hash -> const char*
-  HashMap function_and_resource_names_;
+  StringsStorage function_and_resource_names_;
   // args_count -> char*
   List<char*> args_count_names_;
   List<CodeEntry*> code_entries_;