Review Request: JDK-8173978: should allow teleporting from a lookup class in a named module without dropping all access

Mandy Chung mandy.chung at
Tue Jul 2 01:47:16 UTC 2019

On 7/1/19 12:51 PM, Mandy Chung wrote:
> This is an enhancement to |`Lookup::in`| and 
> |`MethodHandles::privateLookupIn`| API
> for cross module teleporting.  A `Lookup` object will record the previous
> lookup class from which this |Lookup| object was teleported such that
> the access check will use both the previous lookup class and the current
> |lookup| context (current lookup class and allowed modes) to determine if
> a type is accessible to this `Lookup` object or not.
> In a nutshell, `T` in M2 is accessible to a `Lookup` object on `C`
> (lookup class in M1) and `PLC` (previous lookup class in M0) if and 
> only if
> 1. both M0 and M1 can read M2
> 2. T is in a package that is exported from M2 at least to both M0 and M1
> Detailed specification is in Lookup class spec and `accessClass` javadoc.
> The relevant spec about cross-module teleporting is in the Lookup class
> spec and `Lookup::in` and `MethodHandles::privateLookupIn`.
> CSR:
> webrev:
> javadoc:
> I have yet to generate the spec diff. The tool is currently broken
> due to javadoc change.  I'll try to workaround it and post the
> spec diff soon.



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