Moved the execution context that was in the Debugger into

the CommandInterpreter where it was always being used.

Make sure that Modules can track their object file offsets correctly to
allow opening of sub object files (like the "__commpage" on darwin).

Modified the Platforms to be able to launch processes. The first part of this
move is the platform soon will become the entity that launches your program
and when it does, it uses a new ProcessLaunchInfo class which encapsulates
all process launching settings. This simplifies the internal APIs needed for
launching. I want to slowly phase out process launching from the process
classes, so for now we can still launch just as we used to, but eventually
the platform is the object that should do the launching.

Modified the Host::LaunchProcess in the MacOSX Host.mm to correctly be able
to launch processes with all of the new eLaunchFlag settings. Modified any
code that was manually launching processes to use the Host::LaunchProcess
functions.

Fixed an issue where lldb_private::Args had implicitly defined copy 
constructors that could do the wrong thing. This has now been fixed by adding
an appropriate copy constructor and assignment operator.

Make sure we don't add empty ModuleSP entries to a module list.

Fixed the commpage module creation on MacOSX, but we still need to train
the MacOSX dynamic loader to not get rid of it when it doesn't have an entry
in the all image infos.

Abstracted many more calls from in ProcessGDBRemote down into the 
GDBRemoteCommunicationClient subclass to make the classes cleaner and more
efficient.

Fixed the default iOS ARM register context to be correct and also added support
for targets that don't support the qThreadStopInfo packet by selecting the
current thread (only if needed) and then sending a stop reply packet.

Debugserver can now start up with a --unix-socket (-u for short) and can 
then bind to port zero and send the port it bound to to a listening process
on the other end. This allows the GDB remote platform to spawn new GDB server
instances (debugserver) to allow platform debugging.

llvm-svn: 129351

1 files changed, 178 insertions, 13 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
index 2cebb10c0fb..d4f6592f5bd 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
@@ -34,8 +34,8 @@ using namespace lldb_private;
 //----------------------------------------------------------------------
 // GDBRemoteCommunicationClient constructor
 //----------------------------------------------------------------------
-GDBRemoteCommunicationClient::GDBRemoteCommunicationClient() :
-    GDBRemoteCommunication("gdb-remote.client", "gdb-remote.client.rx_packet"),
+GDBRemoteCommunicationClient::GDBRemoteCommunicationClient(bool is_platform) :
+    GDBRemoteCommunication("gdb-remote.client", "gdb-remote.client.rx_packet", is_platform),
     m_supports_not_sending_acks (eLazyBoolCalculate),
     m_supports_thread_suffix (eLazyBoolCalculate),
     m_supports_vCont_all (eLazyBoolCalculate),
@@ -49,6 +49,14 @@ GDBRemoteCommunicationClient::GDBRemoteCommunicationClient() :
     m_supports_qfProcessInfo (true),
     m_supports_qUserName (true),
     m_supports_qGroupName (true),
+    m_supports_qThreadStopInfo (true),
+    m_supports_z0 (true),
+    m_supports_z1 (true),
+    m_supports_z2 (true),
+    m_supports_z3 (true),
+    m_supports_z4 (true),
+    m_curr_tid (LLDB_INVALID_THREAD_ID),
+    m_curr_tid_run (LLDB_INVALID_THREAD_ID),
     m_async_mutex (Mutex::eMutexTypeRecursive),
     m_async_packet_predicate (false),
     m_async_packet (),
@@ -126,6 +134,12 @@ GDBRemoteCommunicationClient::ResetDiscoverableSettings()
     m_supports_qfProcessInfo = true;
     m_supports_qUserName = true;
     m_supports_qGroupName = true;
+    m_supports_qThreadStopInfo = true;
+    m_supports_z0 = true;
+    m_supports_z1 = true;
+    m_supports_z2 = true;
+    m_supports_z3 = true;
+    m_supports_z4 = true;
     m_host_arch.Clear();
 }
 
@@ -1119,7 +1133,7 @@ GDBRemoteCommunicationClient::SetDisableASLR (bool enable)
 }
 
 bool
-GDBRemoteCommunicationClient::DecodeProcessInfoResponse (StringExtractorGDBRemote &response, ProcessInfo &process_info)
+GDBRemoteCommunicationClient::DecodeProcessInfoResponse (StringExtractorGDBRemote &response, ProcessInstanceInfo &process_info)
 {
     if (response.IsNormalResponse())
     {
@@ -1139,7 +1153,7 @@ GDBRemoteCommunicationClient::DecodeProcessInfoResponse (StringExtractorGDBRemot
             }
             else if (name.compare("uid") == 0)
             {
-                process_info.SetRealUserID (Args::StringToUInt32 (value.c_str(), UINT32_MAX, 0));
+                process_info.SetUserID (Args::StringToUInt32 (value.c_str(), UINT32_MAX, 0));
             }
             else if (name.compare("euid") == 0)
             {
@@ -1147,7 +1161,7 @@ GDBRemoteCommunicationClient::DecodeProcessInfoResponse (StringExtractorGDBRemot
             }
             else if (name.compare("gid") == 0)
             {
-                process_info.SetRealGroupID (Args::StringToUInt32 (value.c_str(), UINT32_MAX, 0));
+                process_info.SetGroupID (Args::StringToUInt32 (value.c_str(), UINT32_MAX, 0));
             }
             else if (name.compare("egid") == 0)
             {
@@ -1180,7 +1194,7 @@ GDBRemoteCommunicationClient::DecodeProcessInfoResponse (StringExtractorGDBRemot
 }
 
 bool
-GDBRemoteCommunicationClient::GetProcessInfo (lldb::pid_t pid, ProcessInfo &process_info)
+GDBRemoteCommunicationClient::GetProcessInfo (lldb::pid_t pid, ProcessInstanceInfo &process_info)
 {
     process_info.Clear();
     
@@ -1205,8 +1219,8 @@ GDBRemoteCommunicationClient::GetProcessInfo (lldb::pid_t pid, ProcessInfo &proc
 }
 
 uint32_t
-GDBRemoteCommunicationClient::FindProcesses (const ProcessInfoMatch &match_info,
-                                             ProcessInfoList &process_infos)
+GDBRemoteCommunicationClient::FindProcesses (const ProcessInstanceInfoMatch &match_info,
+                                             ProcessInstanceInfoList &process_infos)
 {
     process_infos.Clear();
     
@@ -1261,10 +1275,10 @@ GDBRemoteCommunicationClient::FindProcesses (const ProcessInfoMatch &match_info,
                 packet.Printf("pid:%u;",match_info.GetProcessInfo().GetProcessID());
             if (match_info.GetProcessInfo().ParentProcessIDIsValid())
                 packet.Printf("parent_pid:%u;",match_info.GetProcessInfo().GetParentProcessID());
-            if (match_info.GetProcessInfo().RealUserIDIsValid())
-                packet.Printf("uid:%u;",match_info.GetProcessInfo().GetRealUserID());
-            if (match_info.GetProcessInfo().RealGroupIDIsValid())
-                packet.Printf("gid:%u;",match_info.GetProcessInfo().GetRealGroupID());
+            if (match_info.GetProcessInfo().UserIDIsValid())
+                packet.Printf("uid:%u;",match_info.GetProcessInfo().GetUserID());
+            if (match_info.GetProcessInfo().GroupIDIsValid())
+                packet.Printf("gid:%u;",match_info.GetProcessInfo().GetGroupID());
             if (match_info.GetProcessInfo().EffectiveUserIDIsValid())
                 packet.Printf("euid:%u;",match_info.GetProcessInfo().GetEffectiveUserID());
             if (match_info.GetProcessInfo().EffectiveGroupIDIsValid())
@@ -1291,7 +1305,7 @@ GDBRemoteCommunicationClient::FindProcesses (const ProcessInfoMatch &match_info,
 
             do
             {
-                ProcessInfo process_info;
+                ProcessInstanceInfo process_info;
                 if (!DecodeProcessInfoResponse (response, process_info))
                     break;
                 process_infos.Append(process_info);
@@ -1447,3 +1461,154 @@ GDBRemoteCommunicationClient::SendSpeedTestPacket (uint32_t send_size, uint32_t
     }
     return false;
 }
+
+uint16_t
+GDBRemoteCommunicationClient::LaunchGDBserverAndGetPort ()
+{
+    StringExtractorGDBRemote response;
+    if (SendPacketAndWaitForResponse("qLaunchGDBServer", strlen("qLaunchGDBServer"), response, false))
+    {
+        std::string name;
+        std::string value;
+        uint16_t port = 0;
+        lldb::pid_t pid = LLDB_INVALID_PROCESS_ID;
+        while (response.GetNameColonValue(name, value))
+        {
+            if (name.size() == 4 && name.compare("port") == 0)
+                port = Args::StringToUInt32(value.c_str(), 0, 0);
+            if (name.size() == 3 && name.compare("pid") == 0)
+                pid = Args::StringToUInt32(value.c_str(), LLDB_INVALID_PROCESS_ID, 0);
+        }
+        return port;
+    }
+    return 0;
+}
+
+bool
+GDBRemoteCommunicationClient::SetCurrentThread (int tid)
+{
+    if (m_curr_tid == tid)
+        return true;
+    
+    char packet[32];
+    int packet_len;
+    if (tid <= 0)
+        packet_len = ::snprintf (packet, sizeof(packet), "Hg%i", tid);
+    else
+        packet_len = ::snprintf (packet, sizeof(packet), "Hg%x", tid);
+    assert (packet_len + 1 < sizeof(packet));
+    StringExtractorGDBRemote response;
+    if (SendPacketAndWaitForResponse(packet, packet_len, response, false))
+    {
+        if (response.IsOKResponse())
+        {
+            m_curr_tid = tid;
+            return true;
+        }
+    }
+    return false;
+}
+
+bool
+GDBRemoteCommunicationClient::SetCurrentThreadForRun (int tid)
+{
+    if (m_curr_tid_run == tid)
+        return true;
+    
+    char packet[32];
+    int packet_len;
+    if (tid <= 0)
+        packet_len = ::snprintf (packet, sizeof(packet), "Hc%i", tid);
+    else
+        packet_len = ::snprintf (packet, sizeof(packet), "Hc%x", tid);
+    
+    assert (packet_len + 1 < sizeof(packet));
+    StringExtractorGDBRemote response;
+    if (SendPacketAndWaitForResponse(packet, packet_len, response, false))
+    {
+        if (response.IsOKResponse())
+        {
+            m_curr_tid_run = tid;
+            return true;
+        }
+    }
+    return false;
+}
+
+bool
+GDBRemoteCommunicationClient::GetStopReply (StringExtractorGDBRemote &response)
+{
+    if (SendPacketAndWaitForResponse("?", 1, response, false))
+        return response.IsNormalResponse();
+    return false;
+}
+
+bool
+GDBRemoteCommunicationClient::GetThreadStopInfo (uint32_t tid, StringExtractorGDBRemote &response)
+{
+    if (m_supports_qThreadStopInfo)
+    {
+        char packet[256];
+        int packet_len = ::snprintf(packet, sizeof(packet), "qThreadStopInfo%x", tid);
+        assert (packet_len < sizeof(packet));
+        if (SendPacketAndWaitForResponse(packet, packet_len, response, false))
+        {
+            if (response.IsUnsupportedResponse())
+                m_supports_qThreadStopInfo = false;
+            else if (response.IsNormalResponse())
+                return true;
+            else
+                return false;
+        }
+    }
+    if (SetCurrentThread (tid))
+        return GetStopReply (response);
+    return false;
+}
+
+
+uint8_t
+GDBRemoteCommunicationClient::SendGDBStoppointTypePacket (GDBStoppointType type, bool insert,  addr_t addr, uint32_t length)
+{
+    switch (type)
+    {
+    case eBreakpointSoftware:   if (!m_supports_z0) return UINT8_MAX; break;
+    case eBreakpointHardware:   if (!m_supports_z1) return UINT8_MAX; break;
+    case eWatchpointWrite:      if (!m_supports_z2) return UINT8_MAX; break;
+    case eWatchpointRead:       if (!m_supports_z3) return UINT8_MAX; break;
+    case eWatchpointReadWrite:  if (!m_supports_z4) return UINT8_MAX; break;
+    default:                    return UINT8_MAX;
+    }
+
+    char packet[64];
+    const int packet_len = ::snprintf (packet, 
+                                       sizeof(packet), 
+                                       "%c%i,%llx,%x", 
+                                       insert ? 'Z' : 'z', 
+                                       type, 
+                                       addr, 
+                                       length);
+
+    assert (packet_len + 1 < sizeof(packet));
+    StringExtractorGDBRemote response;
+    if (SendPacketAndWaitForResponse(packet, packet_len, response, true))
+    {
+        if (response.IsOKResponse())
+            return 0;
+        if (response.IsUnsupportedResponse())
+        {
+            switch (type)
+            {
+                case eBreakpointSoftware:   m_supports_z0 = false; break;
+                case eBreakpointHardware:   m_supports_z1 = false; break;
+                case eWatchpointWrite:      m_supports_z2 = false; break;
+                case eWatchpointRead:       m_supports_z3 = false; break;
+                case eWatchpointReadWrite:  m_supports_z4 = false; break;
+                default:                    break;
+            }
+        }
+        else if (response.IsErrorResponse())
+            return response.GetError();
+    }
+    return UINT8_MAX;
+}