This PR prevents the `clhsdb pstack` command from throwing a
`DebuggerException` when obtaining the top frame. The exception occurs when the
PC is within a native library that has no `.eh_frame` section.
I added a test, `ClhsdbPstackNoEhFrame.java`, that uses a native library
without an `.eh_frame` section. The test fails with a `DebuggerException`
without the fix in `LinuxAARCH64CFrame.java`.
`getFrameFromReg()` returns the current frame without DWARF information if
DWARF parsing fails and the PC is within a known native library. Unwinding
stops at this frame, but analysis continues for other threads. This behavior is
consistent with the existing `sender()` method.
#### Testing
I've run the following tests on Linux AArch64.
$ make run-test
TEST="jtreg:hotspot/jtreg/serviceability/sa/ClhsdbPstackNoEhFrame.java"
TEST TOTAL PASS FAIL ERROR
SKIP
jtreg:test/hotspot/jtreg/serviceability/sa/ClhsdbPstackNoEhFrame.java
1 1 0 0
0
$ make run-test TEST="jtreg:hotspot/jtreg/serviceability/sa/"
TEST TOTAL PASS FAIL ERROR
SKIP
jtreg:test/hotspot/jtreg/serviceability/sa 81 76 0 0
5
---------
- [x] I confirm that I make this contribution in accordance with the [OpenJDK
Interim AI Policy](https://openjdk.org/legal/ai).
-------------
Commit messages:
- Handle missing DWARF information in the top frame on Linux AArch64
Changes: https://git.openjdk.org/jdk/pull/33839/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=33839&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8386291
Stats: 204 lines in 5 files changed: 202 ins; 0 del; 2 mod
Patch: https://git.openjdk.org/jdk/pull/33839.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/33839/head:pull/33839
PR: https://git.openjdk.org/jdk/pull/33839
