RFR: 8297757: VarHandles.getStaticFieldFromBaseAndOffset should get the receiver type from VarHandle

[Paul Sandoz]

On Thu, 19 Jan 2023 19:14:38 GMT, Mandy Chung <mchung at openjdk.org> wrote:

> `VarHandles.getStaticFieldFromBaseAndOffset` maps a base/offset/fieldType to a static `Field`.   It's fragile to assume that the location of a static field returned by `Unsafe.staticFieldBase` is a Class object.    This changes the VarHandle implementation for static fields (i.e. `FieldStaticReadOnly` and `FieldStaticReadWrite` classes) to include the receiver type in addition to the base and offset.

src/java.base/share/classes/java/lang/invoke/VarHandles.java line 187:

> 185:     // Required by instance static field handles
> 186:     static Field getStaticFieldFromBaseAndOffset(Class<?> receiverType,
> 187:                                                  Object base,

`base` is now unused.

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PR: https://git.openjdk.org/jdk/pull/12100