RFR: JDK-8264899: C1: -XX:AbortVMOnException does not work if all methods in the call stack are compiled with C1 and there are no exception handlers [v4]
Damon Fenacci
duke at openjdk.org
Thu Jun 15 10:42:03 UTC 2023
> # Problem
> The `AbortVMOnException` flag prints the stack trace instead of aborting when the code gets compiled with C1.
> This only happens when the exception gets unwound, all methods in the call stack are compiled with C1 and there are no exception handlers for that exception.
> This happens here (for x86. Other platform's implementations are similar):
>
> https://github.com/openjdk/jdk/blob/4d4706967d44b6908406818bb135f94130f373a0/src/hotspot/cpu/x86/c1_Runtime1_x86.cpp#L1209-L1215
>
> # Solution
> To catch this situation, if `AbortVMOnException` is set, a call to check if there is a match is added when unwinding the exception. This is done in the `void Runtime1::generate_unwind_exception` which is the sole call of the `unwind_exception_id` case.
>
> On a few architectures a *move* instruction is needed (e.g. `__ mov(rscratch1, exception_oop)`) to copy the exception oop into a different register that doesn't conflict with the argument of the C calling convention. This is checked with asserts in most architectures but not for *aarch64* (new enhancement issue: [JDK-8310020](https://bugs.openjdk.org/browse/JDK-8310020)).
>
> A regression test is added as well.
>
> # Testing
> This fix includes changes for x86_32/64 and aarch64, which I could test thoroughly but also for **arm**, **ppc**, **riscv**, and **s390** for which I would **need some help with testing**.
Damon Fenacci has updated the pull request incrementally with one additional commit since the last revision:
JDK-8310020: remove unneeded mr ppc instruction
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/14240/files
- new: https://git.openjdk.org/jdk/pull/14240/files/d899bb83..cbe0111f
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=14240&range=03
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=14240&range=02-03
Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
Patch: https://git.openjdk.org/jdk/pull/14240.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/14240/head:pull/14240
PR: https://git.openjdk.org/jdk/pull/14240
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