[Bug gdb/33136] New: [native-gdbserver] FAIL: gdb.trace/unavailable-dwarf-piece.exp: tracing bar: p/d x

[simark at simark dot ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=33136

            Bug ID: 33136
           Summary: [native-gdbserver] FAIL:
                    gdb.trace/unavailable-dwarf-piece.exp: tracing bar:
                    p/d x
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: simark at simark dot ca
  Target Milestone: ---

Commit 420d030e88 ("Handle field with dynamic bit offset") regressed this test.

To make it easier to debug (without having to use tracing and gdbserver), we
can do:

diff --git a/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
b/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
index 98207f01316a..70d434d0c42b 100644
--- a/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
+++ b/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
@@ -228,7 +228,6 @@ Dwarf::assemble $asm_file {
                        DW_OP_lit0
                        DW_OP_stack_value
                        DW_OP_piece 1
-                       DW_OP_reg0
                        DW_OP_bit_piece 1 0
                        DW_OP_lit0
                        DW_OP_stack_value

I then run:

$ ./gdb -q -nx --data-directory=data-directory
testsuite/outputs/gdb.trace/unavailable-dwarf-piece/unavailable-dwarf-piece -ex
"b bar_start_lbl" -ex r -ex "p/x x" -batch

Before the commit:

$1 = {a = 0x0, b = <optimized out>, c = 0x0, d = 0x0, e = 0x0, f = 0x0, g =
0x0, h = 0x0, i = 0x0, j = 0x0}

After the commit:

$1 = {a = 0x0, b = <optimized out>, c = <optimized out>, d = <optimized out>, e
= <optimized out>, f = <optimized out>, g = <optimized out>, h = <optimized
out>, i = <optimized out>, j = 0x0}

I haven't found the root cause yet.

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