Integrated: JDK-8330565 : C2: Multiple crashes with CTW after JDK-8316991

Fri May 17 23:42:09 UTC 2024

On Wed, 8 May 2024 23:44:23 GMT, Cesar Soares Lucas <cslucas at openjdk.org> wrote:

> The `# assert(false) failed: Bad graph detected in build_loop_late` failure was caused because a string concatenation optimization using [this method](https://github.com/openjdk/jdk/blob/819f3d6fc70ff6fe54ac5f9033c17c3dd4326aa5/src/hotspot/share/opto/graphKit.cpp#L4115) adds AddP and LoadN nodes to IR graph as NotNull _and_ because RAM was not "nullyfing" phis merging nullable pointers. I was only able to reproduce this problem using a classfile/jar compiled using an "old" version of JDK.. because newer version use InvokeDynamic to do string concatenation.
> 
> Tested with JTREG tier1-4 on Linux x86_64 & ARM64.

This pull request has now been integrated.

Changeset: 8acdd2d7
Author:    Cesar Soares Lucas <cslucas at openjdk.org>
Committer: Tobias Hartmann <thartmann at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/8acdd2d7c8de17515b87815d54ce556237039406
Stats:     91 lines in 2 files changed: 81 ins; 0 del; 10 mod

8330565: C2: Multiple crashes with CTW after JDK-8316991

Reviewed-by: kvn, thartmann

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PR: https://git.openjdk.org/jdk/pull/19147