Consuming code cache from older V8 version

[Tekman]

Hi,

We use a code cache to speed up load times for large JavaScript bundles. We reload the cache by passing kConsumeCodeCache and a CachedData into ScriptCompiler::Compile. 

This generally works fine except when moving between some versions of V8 (which I presume alters the layout of some of the serialized structures).

The problem is the failure presents as a crash (V8_Fatal called a few layers into a v8::internal::Deserializer). Is there a way to validate the cache or otherwise treat this as an exception we can handle instead? (if we fail to load the cache, we'd just load the bundle from source and preserve the new cache, no big deal, but the crash just brings down the whole program).

Thanks!

[Ronald Fenner]

Not sure there is but it's probably safer when your app updates with a different version of v8 to just flush the whole cache.

[Keyhan Vakil]

You can key your cache on v8::ScriptCompiler::CachedDataVersionTag.

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