[lldb-dev] [Bug 39798] New: Expression parser: Couldn't materialize: couldn't get the value of variable g_88: DW_OP_piece for offset 4 but top of stack is of size 108

[via lldb-dev]

https://bugs.llvm.org/show_bug.cgi?id=39798

            Bug ID: 39798
           Summary: Expression parser: Couldn't materialize: couldn't get
                    the value of variable g_88: DW_OP_piece for offset 4
                    but top of stack is of size 108
           Product: lldb
           Version: 7.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: davide at freebsd.org
                CC: llvm-bugs at lists.llvm.org

Created attachment 21162
  --> https://bugs.llvm.org/attachment.cgi?id=21162&action=edit
testcase

(lldb) b main
Breakpoint 1: where = a.out`main + 4 at a-prepro.c:2303:5, address =
0x0000000100000b44
(lldb) r
Process 81971 launched:
'/Users/davide/work/llvm-project-20170507/build-rel/bin/a.out' (x86_64)
a.out was compiled with optimization - stepping may behave oddly; variables may
not be available.
Process 81971 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x0000000100000b44 a.out`main(argc=1, argv=0x00007ffeefbffaf0) at
a-prepro.c:2303:5 [opt]
   2300     int print_hash_value = 0;
   2301     if (argc == 2 && strcmp(argv[1], "1") == 0) print_hash_value = 1;
   2302     platform_main_begin();
-> 2303     func_1();
   2304     for (i = 0; i < 8; i++)
   2305     {
   2306         csmith_sink_ = g_8[i];
(lldb) frame var g_88
(S0 [5]) g_88 = <DW_OP_piece for offset 4 but top of stack is of size 108>

(lldb) p g_88
error: Couldn't materialize: couldn't get the value of variable g_88:
DW_OP_piece for offset 4 but top of stack is of size 108
error: errored out in DoExecute, couldn't PrepareToExecuteJITExpression

$ ./clang a-prepro.c -g -O1 -Wno-everything

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