The switch to use the old dynamically BSM registration is
AllowTransitionalJSR292
for those like me that relies on ASM.
ASM that doesn't support (at the moment) this new constant pool
attribute (CONSTANT_InvokeDynamic).
Rémi
Le 11/07/2010 07:25, John Rose a écrit :
There are more JVM changes in the pipeline, FYI.
Bootstrap methods are going to be made specific to instructions, and
(therefore) represented statically in the constant pool.
The new CP entry CONSTANT_InvokeDynamic will be an ordered pair of CP indexes,
the first to a CONSTANT_MethodHandle (the BSM) and the second to a
CONSTANT_NameAndType (which is the same as before).
For now, the JVM will accept both kinds of index in an invokedynamic
instruction. The EG expects to get rid of the dynamically-registered BSM for
invokedynamic, in favor of this new static notation in the classfile.
Notation in the Java language is TBD; the prototype uses annotations to declare
BSMs, but that's not a kosher use of annotations.
-- John
From: John Rose<[email protected]>
Date: July 10, 2010 10:17:26 PM PDT
To: hotspot compiler<[email protected]>
Subject: Request for review (L): 6964498: JSR 292 invokedynamic sites need
local bootstrap methods
These JVM changes implement per-call-site bootstrap methods. The JSR 292 EG is
(almost certainly) going to change the bootstrap method from a dynamically
specified per-class attribute to a statically-specified per-instruction
attribute (in the constant pool). This is the implementation.
http://cr.openjdk.java.net/~jrose/6964498/webrev/
This JVM continues to run programs with old-style bootstrap methods, under a
compatibility switch. These JVM changes will be pushed unilaterally, before
corresponding JDK and javac changes.
-- John
P.S. Here, FYI, are some prototyped JDK and javac changes which work with the JVM webrev.
They are almost certain to change, since we don't know yet on how to "spell"
bootstrap methods in the Java language. Annotations are a convenient hack, but probably
not the right final answer.
http://cr.openjdk.java.net/~jrose/6964498/jdk-webrev/
http://cr.openjdk.java.net/~jrose/6964498/lt-webrev/
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