[platform process list] add a flag for showing the processes of all users

Summary:
For context: https://reviews.llvm.org/D68293

We need a way to show all the processes on android regardless of the user id.
When you run `platform process list`, you only see the processes with the same user as the user that launched lldb-server. However, it's quite useful to see all the processes, though, and it will lay a foundation for full apk debugging support from lldb.

Before:
```
PID    PARENT USER       TRIPLE                   NAME
====== ====== ========== ======================== ============================
3234   1                 aarch64-unknown-linux-android adbd
8034   3234              aarch64-unknown-linux-android sh
9096   3234              aarch64-unknown-linux-android sh
9098   9096              aarch64-unknown-linux-android lldb-server
(lldb) ^D
```

Now:
```
(lldb) platform process list -x
205 matching processes were found on "remote-android"
PID    PARENT USER       TRIPLE                   NAME
====== ====== ========== ======================== ============================
1      0                                          init
524    1                                          init
525    1                                          init
531    1                                          ueventd
568    1                                          logd
569    1                 aarch64-unknown-linux-android servicemanager
570    1                 aarch64-unknown-linux-android hwservicemanager
571    1                 aarch64-unknown-linux-android vndservicemanager
577    1                 aarch64-unknown-linux-android qseecomd
580    577               aarch64-unknown-linux-android qseecomd
...
23816  979                                        com.android.providers.calendar
24600  979                                        com.verizon.mips.services
27888  979                                        com.hualai
28043  2378                                       com.android.chrome:sandboxed_process0
31449  979                                        com.att.shm
31779  979                                        com.samsung.android.authfw
31846  979                                        com.samsung.android.server.iris
32014  979                                        com.samsung.android.MtpApplication
32045  979                                        com.samsung.InputEventApp
```

Reviewers: labath,xiaobai,aadsm,clayborg

Subscribers:

llvm-svn: 373931

2 files changed, 7 insertions, 0 deletions

diff --git a/lldb/source/Commands/CommandObjectPlatform.cpp b/lldb/source/Commands/CommandObjectPlatform.cpp
index 7fb37839be7..fbd13aa37bd 100644
--- a/lldb/source/Commands/CommandObjectPlatform.cpp
+++ b/lldb/source/Commands/CommandObjectPlatform.cpp
@@ -1264,6 +1264,10 @@ protected:
         verbose = true;
         break;
 
+      case 'x':
+        match_info.SetMatchAllUsers(true);
+        break;
+
       default:
         llvm_unreachable("Unimplemented option");
       }
diff --git a/lldb/source/Commands/Options.td b/lldb/source/Commands/Options.td
index 477b5532946..87f5506c305 100644
--- a/lldb/source/Commands/Options.td
+++ b/lldb/source/Commands/Options.td
@@ -591,6 +591,9 @@ let Command = "platform process list" in {
   def platform_process_list_show_args : Option<"show-args", "A">,
     GroupRange<1, 6>,
     Desc<"Show process arguments instead of the process executable basename.">;
+  def platform_process_list_all_users: Option<"all-users", "x">,
+    GroupRange<1,6>,
+    Desc<"Show processes matching all user IDs.">;
   def platform_process_list_verbose : Option<"verbose", "v">, GroupRange<1, 6>,
     Desc<"Enable verbose output.">;
 }