review request (L): 6984311 JSR 292 needs optional bootstrap method parameters

John Rose john.r.rose at
Mon Nov 22 18:57:56 PST 2010

Because of a strong and reasonable request from the IBM JVM team, the JSR 292 class file format for CONSTANT_InvokeDynamic is changing one more time.  The current format looks like this:

	struct { u1 tag = 18, u2 bsm: MethodHandle, u2 nt: NameAndType, u2 argc, u2 argv[argc] }

The new format will look like this:

	struct { u1 tag = 18, u2 bsm_spec: MethodHandle, u2 nt: NameAndType }

The bsm_spec will be an index into an explicit side-table in the class file, containing an array of the same information as before (MethodHandle, argc, argv[argc]).  The side-table will be a new attribute named "BootstrapMethods".

This format change will make the class file format a easier to parse by some JVMs (such as J9).

I will be putting out a review request soon for this.

-- John

On Nov 2, 2010, at 2:38 AM, Christian Thalinger wrote:

> On Oct 30, 2010, at 9:08 PM, John Rose wrote:
>> ...
>> Thanks.  I am updating the webrev:
> Looks good.  -- Christian

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