Add a version tag for cached data.

src/api.cc

 // Copyright 2012 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.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 1828 matching lines @@
   }  // HandleScope goes out of scope.
   i::Handle<i::SharedFunctionInfo> result(raw_result, isolate);
   Local<UnboundScript> generic = ToApiHandle<UnboundScript>(result);
   if (generic.IsEmpty()) {
     return Local<Script>();
   }
   return generic->BindToCurrentContext();
 }
 
 
+uint32_t ScriptCompiler::CachedDataVersionTag() {
+  return internal::Version::Hash() ^ internal::FlagList::Hash() ^
+         internal::CpuFeatures::SupportedFeatures();

[Sven Panne, 2014/11/12 15:55:31]

This is a very bad hash, please use the hashing facilitites from
src/base/functional.h

[vogelheim, 2014/11/12 18:34:30]

Done.

Thanks; I was looking for something like those hash functions, but somehow
didn't find them. :(

+}
+
+
 Local<Script> Script::Compile(v8::Handle<String> source,
                               v8::ScriptOrigin* origin) {
   i::Handle<i::String> str = Utils::OpenHandle(*source);
   if (origin) {
     ScriptCompiler::Source script_source(source, *origin);
     return ScriptCompiler::Compile(
         reinterpret_cast<v8::Isolate*>(str->GetIsolate()),
         &script_source);
   }
   ScriptCompiler::Source script_source(source);
@@ skipping 5917 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal