[Bug default/27429] New: [dwz, testsuite] mode 4 in checksum_ref_die not exercised in test-suite

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27429

            Bug ID: 27429
           Summary: [dwz, testsuite] mode 4 in checksum_ref_die not
                    exercised in test-suite
           Product: dwz
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: vries at gcc dot gnu.org
                CC: dwz at sourceware dot org
  Target Milestone: ---

The function checksum_ref_die has four different modes.

I added mode detection at the start of the function, to see which would be
triggered by the testsuite.

Modes 1, 2 and 3 are all triggered.

But not mode 4, also not in the external test suite.

This:
...
@@ -4306,7 +4321,7 @@ checksum_ref_die (dw_cu_ref cu, dw_die_ref top_die,
dw_die_ref die,
                    }                                                           
                }                                                               
            }                                                                   
-         if (minidx != -1U)                                                    
+         if (false && minidx != -1U)                                           
            {                                                                   
              idx = 0;                                                          
              checksum_ref_die (die_cu (arr[minidx]), arr[minidx],              
...
forces to use mode 4 instead of mode 3.

No issues found in test-suite.

This slows down the external testsuite.  These tests pass:
...
PASS: /home/vries/dwz/dwz.git/testsuite/dwz-external.tests/kernel-32.sh
PASS: /home/vries/dwz/dwz.git/testsuite/dwz-external.tests/pr24204.sh
PASS: /home/vries/dwz/dwz.git/testsuite/dwz-external.tests/pr24195.sh
...
but kernel.sh is either hanging or very slow.  I presume the same will happen
with kernel-multifile.sh.

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