Review Request: JDK-8173978: Lookup.in should allow teleporting from a lookup class in a named module without dropping all access
mandy.chung at oracle.com
Mon Jul 1 19:51:11 UTC 2019
This is an enhancement to |`Lookup::in`| and
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`.
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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