[Bug python/31441] New: [gdb/python] Add gdb.Value.entirely_available and gdb.Value.entirely_unavailable

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31441

            Bug ID: 31441
           Summary: [gdb/python] Add gdb.Value.entirely_available and
                    gdb.Value.entirely_unavailable
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Before this commit:
...
commit bbb12eb9c84aa2b32480b7c022c494c2469ef717
Author: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Date:   Mon Feb 26 19:11:45 2024 -0300

    gdb/arm: Remove tpidruro register from non-FreeBSD target descriptions

...
test-case gdb.base/inline-frame-cycle-unwind.exp failed on arm-linux.

I managed to write a test-case fix:
...
diff --git a/gdb/testsuite/gdb.base/inline-frame-cycle-unwind.py
b/gdb/testsuite/gdb.base/inline-frame-cycle-unwind
.py
index 278fa857d5d..0110fc74276 100644
--- a/gdb/testsuite/gdb.base/inline-frame-cycle-unwind.py
+++ b/gdb/testsuite/gdb.base/inline-frame-cycle-unwind.py
@@ -65,6 +65,13 @@ class TestUnwinder(Unwinder):

         for reg in pending_frame.architecture().registers("general"):
             val = pending_frame.read_register(reg)
+            have_bytes = True
+            try:
+                val.bytes
+            except Exception:
+                have_bytes = False
+            if not have_bytes:
+                continue
             unwinder.add_saved_register(reg, val)
         return unwinder
...
which made we wonder why we have gdb.Value.is_optimized_out, but not the
is_entirely_available or is_entirely_unavailable variants.

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