[all-commits] [llvm/llvm-project] 36cb74: [clang][OpenMP][DebugInfo] Debug support for priva...

[Alok Kumar Sharma via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 36cb7477d1d43de1d97a4c2b4ba0eb5ae29cbafd
      https://github.com/llvm/llvm-project/commit/36cb7477d1d43de1d97a4c2b4ba0eb5ae29cbafd
  Author: Alok Kumar Sharma <AlokKumar.Sharma at amd.com>
  Date:   2021-11-25 (Thu, 25 Nov 2021)

  Changed paths:
    M clang/lib/CodeGen/CGStmtOpenMP.cpp
    A clang/test/OpenMP/debug_private.c

  Log Message:
  -----------
  [clang][OpenMP][DebugInfo] Debug support for private variables inside an OpenMP task construct

Currently variables appearing inside private/firstprivate/lastprivate
clause of openmp task construct are not visible inside lldb debugger.
This is because compiler does not generate debug info for it.

Please consider the testcase debug_private.c attached with patch.

```
   28   #pragma omp task shared(res) private(priv1, priv2) firstprivate(fpriv)
   29       {
   30         priv1 = n;
   31         priv2 = n + 2;
   32         printf("Task n=%d,priv1=%d,priv2=%d,fpriv=%d\n",n,priv1,priv2,fpriv);
   33
-> 34         res = priv1 + priv2 + fpriv + foo(n - 1);
   35       }
   36   #pragma omp taskwait
   37       return res;
(lldb) p priv1
error: <user expression 0>:1:1: use of undeclared identifier 'priv1'
priv1
^
(lldb) p priv2
error: <user expression 1>:1:1: use of undeclared identifier 'priv2'
priv2
^
(lldb) p fpriv
error: <user expression 2>:1:1: use of undeclared identifier 'fpriv'
fpriv
^
```

After the current patch, lldb is able to show the variables

```
(lldb) p priv1
(int) $0 = 10
(lldb) p priv2
(int) $1 = 12
(lldb) p fpriv
(int) $2 = 14
```

Reviewed By: djtodoro

Differential Revision: https://reviews.llvm.org/D114504