Valgrind cleanliness, part 5: Delete extensions on exit.

This fixes 4 leaks, returning 196 bytes of lost memory.

Review URL: https://chromiumcodereview.appspot.com/9864034

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11184 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.cc

@@ -512,6 +512,16 @@ void RegisteredExtension::Register(RegisteredExtension* that) {
 }
 
 
+void RegisteredExtension::UnregisterAll() {
+  RegisteredExtension* re = first_extension_;
+  while (re != NULL) {
+    RegisteredExtension* next = re->next();
+    delete re;
+    re = next;
+  }
+}
+
+
 void RegisterExtension(Extension* that) {
   RegisteredExtension* extension = new RegisteredExtension(that);
   RegisteredExtension::Register(extension);

src/api.h

@@ -146,6 +146,7 @@ class RegisteredExtension {
  public:
   explicit RegisteredExtension(Extension* extension);
   static void Register(RegisteredExtension* that);
+  static void UnregisterAll();
   Extension* extension() { return extension_; }
   RegisteredExtension* next() { return next_; }
   RegisteredExtension* next_auto() { return next_auto_; }

src/extensions/externalize-string-extension.cc

@@ -133,11 +133,8 @@ v8::Handle<v8::Value> ExternalizeStringExtension::IsAscii(
 
 
 void ExternalizeStringExtension::Register() {
-  static ExternalizeStringExtension* externalize_extension = NULL;
-  if (externalize_extension == NULL)
-    externalize_extension = new ExternalizeStringExtension;
-  static v8::DeclareExtension externalize_extension_declaration(
-      externalize_extension);
+  static ExternalizeStringExtension externalize_extension;
+  static v8::DeclareExtension declaration(&externalize_extension);
 }
 
 } }  // namespace v8::internal

src/extensions/gc-extension.cc

@@ -46,9 +46,8 @@ v8::Handle<v8::Value> GCExtension::GC(const v8::Arguments& args) {
 
 
 void GCExtension::Register() {
-  static GCExtension* gc_extension = NULL;
-  if (gc_extension == NULL) gc_extension = new GCExtension();
-  static v8::DeclareExtension gc_extension_declaration(gc_extension);
+  static GCExtension gc_extension;
+  static v8::DeclareExtension declaration(&gc_extension);
 }
 
 } }  // namespace v8::internal

src/v8.cc

@@ -106,6 +106,7 @@ void V8::TearDown() {
 
   ElementsAccessor::TearDown();
   LOperand::TearDownCaches();
+  RegisteredExtension::UnregisterAll();
 
   isolate->TearDown();
   delete isolate;