RFR: 8253623: Fastdebug JVM crashes with Vector API when PrintAssembly is turned on

[Vladimir Ivanov]

On Sun, 25 Oct 2020 06:43:16 GMT, Dongbo He <dongbohe at openjdk.org> wrote:

> Backport 8253623  https://github.com/openjdk/panama-vector/pull/8

src/hotspot/share/opto/callnode.cpp line 492:

> 490:         if (iklass != NULL) {
> 491:           st->print(" [");
> 492:           iklass->nof_nonstatic_fields(); // FIXME: iklass->_nonstatic_fields == NULL

It was intended as a quick hack and `JVMState::format()` is not the right place to solve the problem.
I suggest to look at `PhaseVector::scalarize_vbox_node`. 

Here are some pointers on how it is done in other places:
  https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/macro.cpp#L740
  https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/memnode.cpp#L1320

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PR: https://git.openjdk.java.net/jdk/pull/853