Request for reviews (XS): 7087727: JSR 292: C2 crash if ScavengeRootsInCode=2 when "static final" MethodHandle constants are in use
christian.thalinger at oracle.com
Tue Nov 8 03:57:29 PST 2011
7087727: JSR 292: C2 crash if ScavengeRootsInCode=2 when "static final" MethodHandle constants are in use
The flag setting ScavengeRootsInCode=2 causes the JIT to inline more
constants. This is generally a good thing for performance, but can
cause bugs in compiled code.
The test case has a code pattern that looks similar to the
selectAlternative idiom but boils down to a different invoke bytecode
(invokevirtual in that case). The current code in
PredictedDynamicCallGenerator::generate checks for invokespecial
(which is used by selectAlternative) and so code for invokedynamic is
generated (in non-debug builds) which eventually leads to a crash.
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