gdb.log

dan@hermes:~/p6$ pg6 --profile -e 'my %m is Map = ^2000; %m.WHICH for ^2000; say now - INIT now'
================================================================================================
This is Rakudo Perl 6 running in the GNU debugger, which often allows the user to generate useful back-
traces to debug or report issues in Rakudo, the MoarVM backend or the currently running code.

This Rakudo version is 2018.06.174.gac.2.fa.03.b.2 built on MoarVM version 2018.06.209.g.7.bf.4.c.429.f,
running on ubuntu (18.04.LTS.Bionic.Beaver) / linux (4.15.0.23.generic)

Type `bt full` to generate a backtrace if applicable, type `q` to quit or `help` for help.
------------------------------------------------------------------------------------------------
Reading symbols from /home/dan/Source/perl6/install/bin/moar...done.
Starting program: /home/dan/Source/perl6/install/bin/moar --execname=/home/dan/Source/perl6/install/bin/perl6-gdb-m --libpath=/home/dan/Source/perl6/install/share/nqp/lib --libpath=/home/dan/Source/perl6/install/share/perl6/lib --libpath=/home/dan/Source/perl6/install/share/perl6/runtime /home/dan/Source/perl6/install/share/perl6/runtime/perl6.moarvm --profile -e my\ %m\ is\ Map\ =\ \^2000\;\ %m.WHICH\ for\ \^2000\;\ say\ now\ -\ INIT\ now
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff623f700 (LWP 4163)]
MoarVM oops: Spesh: failed to fix up handler 1 in <unit> (930, -1, -1)

[Thread 0x7ffff623f700 (LWP 4163) exited]
[Inferior 1 (process 4159) exited with code 01]
(gdb) b MVM_oops
Breakpoint 1 at 0x7ffff75c8940: file src/core/exceptions.c, line 840.
(gdb) r
Starting program: /home/dan/Source/perl6/install/bin/moar --execname=/home/dan/Source/perl6/install/bin/perl6-gdb-m --libpath=/home/dan/Source/perl6/install/share/nqp/lib --libpath=/home/dan/Source/perl6/install/share/perl6/lib --libpath=/home/dan/Source/perl6/install/share/perl6/runtime /home/dan/Source/perl6/install/share/perl6/runtime/perl6.moarvm --profile -e my\ %m\ is\ Map\ =\ \^2000\;\ %m.WHICH\ for\ \^2000\;\ say\ now\ -\ INIT\ now
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff623f700 (LWP 4165)]
[Switching to Thread 0x7ffff623f700 (LWP 4165)]

Thread 2 "moar" hit Breakpoint 1, MVM_oops (tc=tc@entry=0x5555557e1da0, messageFormat=messageFormat@entry=0x7ffff7731048 "Spesh: failed to fix up handler %d in %s (%d, %d, %d)") at src/core/exceptions.c:840
840     MVM_NO_RETURN void MVM_oops(MVMThreadContext *tc, const char *messageFormat, ...) {
(gdb) bt
#0  MVM_oops (tc=tc@entry=0x5555557e1da0, messageFormat=messageFormat@entry=0x7ffff7731048 "Spesh: failed to fix up handler %d in %s (%d, %d, %d)") at src/core/exceptions.c:840
#1  0x00007ffff766f7e4 in MVM_spesh_codegen (tc=tc@entry=0x5555557e1da0, g=g@entry=0x7fffec484b50) at src/spesh/codegen.c:302
#2  0x00007ffff767029a in MVM_spesh_candidate_add (tc=tc@entry=0x5555557e1da0, p=0x7fffec4a3a20) at src/spesh/candidate.c:75
#3  0x00007ffff767ef09 in worker (tc=0x5555557e1da0, callsite=<optimized out>, args=<optimized out>) at src/spesh/worker.c:16
#4  0x00007ffff75ef651 in thread_initial_invoke (tc=0x5555557e1da0, data=<optimized out>) at src/core/threads.c:59
#5  0x00007ffff75cac8e in MVM_interp_run (tc=tc@entry=0x5555557e1da0, initial_invoke=0x0, invoke_data=0x1, invoke_data@entry=0x5555557e30c0) at src/core/interp.c:92
#6  0x00007ffff75ef6d6 in start_thread (data=0x5555557e30c0) at src/core/threads.c:87
#7  0x00007ffff6a546db in start_thread (arg=0x7ffff623f700) at pthread_create.c:463
#8  0x00007ffff712b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb)

perf.report

  11.41%  moar     libmoar.so          [.] MVM_string_compare
   9.63%  moar     libmoar.so          [.] MVM_repr_at_pos_s
   4.95%  moar     libmoar.so          [.] MVM_VMArray_at_pos
   3.96%  moar     libmoar.so          [.] at_key
   3.62%  moar     libmoar.so          [.] MVM_string_gi_move_to
   3.00%  moar     libmoar.so          [.] bind_pos
   1.67%  moar     libmoar.so          [.] MVM_nfg_is_concat_stable
   1.65%  moar     libmoar.so          [.] push
   1.63%  moar     libmoar.so          [.] MVM_string_gi_get_grapheme
   1.63%  moar     libc-2.27.so        [.] _int_malloc
   1.61%  moar     libmoar.so          [.] MVM_gc_allocate_object
   1.51%  moar     libmoar.so          [.] MVM_string_utf8_encode_substr
   1.38%  moar     libmoar.so          [.] SHA1_Transform
   1.35%  moar     libmoar.so          [.] MVM_coerce_i_s
   1.20%  moar     libmoar.so          [.] MVM_string_join
   1.12%  moar     libc-2.27.so        [.] cfree@GLIBC_2.2.5
   1.08%  moar     libmoar.so          [.] MVM_repr_bind_pos_s
   1.05%  moar     libmoar.so          [.] copy_to_32bit
   0.93%  moar     libmoar.so          [.] MVM_spesh_arg_guard_run
   0.93%  moar     libmoar.so          [.] MVM_frame_find_invokee_multi_ok
   0.86%  moar     libmoar.so          [.] MVM_frame_invoke
   0.86%  moar     libmoar.so          [.] MVM_box_str
   0.85%  moar     libmoar.so          [.] MVM_VMArray_at_pos@plt
   0.73%  moar     libmoar.so          [.] MVM_multi_cache_find_callsite_args
   0.64%  moar     libmoar.so          [.] get_attribute
   0.63%  moar     libmoar.so          [.] shift
   0.61%  moar     libc-2.27.so        [.] malloc
   0.60%  moar     libmoar.so          [.] MVM_frame_try_return
   0.58%  moar     libmoar.so          [.] MVM_gc_collect_free_nursery_uncopied
   0.58%  moar     libmoar.so          [.] allocate_frame
   0.57%  moar     libc-2.27.so        [.] malloc_consolidate
   0.56%  moar     libmoar.so          [.] MVM_interp_run