Compile a script in strict mode?

[ksak...@chromium.org]

Hi,

In ServiceWorker we would like to enforce ES strict mode on worker scripts:

https://github.com/slightlyoff/ServiceWorker/issues/294

http://crbug.com/415443

V8 has "--use_strict" command line flag which enables strict mode globally, but we want to enforce strict mode only on worker scripts.

Is there any way to achieve this?  Or, would it need a change such as adding an option parameter to ScriptCompiler::Compile()?

I would appreciate any advice and help.

[Sven Panne]

On Mon, Sep 22, 2014 at 8:16 AM, <ksak...@chromium.org> wrote:

[...] V8 has "--use_strict" command line flag which enables strict mode globally, but we want to enforce strict mode only on worker scripts. Is there any way to achieve this?

Currently, no: All our flags are global variables, and the web workers live in the same process as the "normal" v8 Isolate, so all share the same set of flags.

 

 Or, would it need a change such as adding an option parameter to ScriptCompiler::Compile()? [...]

Instead of hacking an ad-hoc parameter into that API entry, we should make our global flags an object which gets passed to Isolate::New. This would not be hard, but quite some (mechanical) work. Any takers? :-)

If you are really in a hurry, perhaps injecting some "use strict" before the actual code might work, too. (?)

[Kunihiko Sakamoto]

Thank you for the quick reply!

Filed a bug: https://code.google.com/p/v8/issues/detail?id=3588

2014-09-22 15:59 GMT+09:00 Sven Panne <sven...@chromium.org>:

On Mon, Sep 22, 2014 at 8:16 AM, <ksak...@chromium.org> wrote:

[...] V8 has "--use_strict" command line flag which enables strict mode globally, but we want to enforce strict mode only on worker scripts. Is there any way to achieve this?

Currently, no: All our flags are global variables, and the web workers live in the same process as the "normal" v8 Isolate, so all share the same set of flags.

 

 Or, would it need a change such as adding an option parameter to ScriptCompiler::Compile()? [...]

Instead of hacking an ad-hoc parameter into that API entry, we should make our global flags an object which gets passed to Isolate::New. This would not be hard, but quite some (mechanical) work. Any takers? :-)

I see.

 

If you are really in a hurry, perhaps injecting some "use strict" before the actual code might work, too. (?)

Yeah, probably we will do that as interim solution. 

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