[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

lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/TestPlatformClient.py

@@ -0,0 +1,34 @@
+import lldb
+import binascii
+import os
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test.decorators import *
+from gdbclientutils import *
+
+
+class TestPlatformClient(GDBRemoteTestBase):
+
+    def test_process_list_with_all_users(self):
+        """Test connecting to a remote linux platform"""
+
+        class MyResponder(MockGDBServerResponder):
+            def qfProcessInfo(self, packet):
+                if "all_users:1" in packet:
+                    return "pid:10;ppid:1;uid:1;gid:1;euid:1;egid:1;name:" + binascii.hexlify("/a/process") + ";args:"
+                else:
+                    return "E04"
+
+        self.server.responder = MyResponder()
+
+        self.runCmd("platform select remote-linux")
+
+        try:
+            self.runCmd("platform connect connect://localhost:%d" %
+                        self.server.port)
+            self.assertTrue(self.dbg.GetSelectedPlatform().IsConnected())
+            self.expect("platform process list -x",
+                        startstr="1 matching process was found", endstr="process" + os.linesep)
+            self.expect("platform process list",
+                        error="error: no processes were found on the \"remote-linux\" platform")
+        finally:
+            self.runCmd("platform disconnect")

lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/gdbclientutils.py

@@ -160,9 +160,34 @@ class MockGDBServerResponder:
             return self.QListThreadsInStopReply()
         if packet.startswith("qMemoryRegionInfo:"):
             return self.qMemoryRegionInfo()
+        if packet == "qQueryGDBServer":
+            return self.qQueryGDBServer()
+        if packet == "qHostInfo":
+            return self.qHostInfo()
+        if packet == "qGetWorkingDir":
+            return self.qGetWorkingDir()
+        if packet == "qsProcessInfo":
+            return self.qsProcessInfo()
+        if packet.startswith("qfProcessInfo"):
+            return self.qfProcessInfo(packet)
 
         return self.other(packet)
 
+    def qsProcessInfo(self):
+        return "E04"
+
+    def qfProcessInfo(self, packet):
+        raise "E04"
+
+    def qGetWorkingDir(self):
+        return "2f"
+
+    def qHostInfo(self):
+        return "ptrsize:8;endian:little;"
+
+    def qQueryGDBServer(self):
+        return "E04"
+
     def interrupt(self):
         raise self.UnexpectedPacketException()
 
@@ -171,7 +196,7 @@ class MockGDBServerResponder:
 
     def vCont(self, packet):
         raise self.UnexpectedPacketException()
-    
+
     def readRegisters(self):
         return "00000000" * self.registerCount
 
@@ -425,7 +450,6 @@ class MockGDBServer:
     class InvalidPacketException(Exception):
         pass
 
-
 class GDBRemoteTestBase(TestBase):
     """
     Base class for GDB client tests.

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");
       }

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.">;
 }

lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp

@@ -2176,8 +2176,7 @@ uint32_t GDBRemoteCommunicationClient::FindProcesses(
       if (match_info.GetProcessInfo().EffectiveGroupIDIsValid())
         packet.Printf("egid:%u;",
                       match_info.GetProcessInfo().GetEffectiveGroupID());
-      if (match_info.GetProcessInfo().EffectiveGroupIDIsValid())
-        packet.Printf("all_users:%u;", match_info.GetMatchAllUsers() ? 1 : 0);
+      packet.Printf("all_users:%u;", match_info.GetMatchAllUsers() ? 1 : 0);
       if (match_info.GetProcessInfo().GetArchitecture().IsValid()) {
         const ArchSpec &match_arch =
             match_info.GetProcessInfo().GetArchitecture();