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From: "bouanto at zoho dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug jit/95314] New: Sharing a local reference to a global variable
 in multiple functions results in location references block not in block tree
Date: Mon, 25 May 2020 13:15:26 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: jit
X-Bugzilla-Version: 10.1.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95314

            Bug ID: 95314
           Summary: Sharing a local reference to a global variable in
                    multiple functions results in location references
                    block not in block tree
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: jit
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: bouanto at zoho dot com
  Target Milestone: ---

Hi.
If a create, in a function, a reference (with gcc_jit_lvalue_get_address) t=
o a
global and reuse this local reference in another function, it gives the
following error:

libgccjit.so: error: location references block not in block tree
=E2=80=A6
during IPA pass: *free_lang_data
libgccjit.so: error: verify_gimple failed
0x7f83924b35c9 verify_gimple_in_cfg(function*, bool)
        ../../gcc-10.1.0/gcc/tree-cfg.c:5462
0x7f839236a819 execute_function_todo
        ../../gcc-10.1.0/gcc/passes.c:1985
0x7f839236add7 do_per_function
        ../../gcc-10.1.0/gcc/passes.c:1647
0x7f839236b06b do_per_function
        ../../gcc-10.1.0/gcc/passes.c:2050
0x7f839236b06b execute_todo
        ../../gcc-10.1.0/gcc/passes.c:2039

I can try to make an example to reproduce this issue if needed.

Is that the expected behavior or should libgccjit gives a proper error?

(Recreating the reference in every function fix this issue.)

Thanks.=