Add exec support for Linux including common support for POSIX.

llvm-svn: 192319

6 files changed, 62 insertions, 5 deletions

diff --git a/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp b/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp
index b69030b22a8..a0cda3485c6 100644
--- a/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp
+++ b/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp
@@ -1487,8 +1487,10 @@ ProcessMonitor::MonitorSIGTRAP(ProcessMonitor *monitor,
     }
 
     case (SIGTRAP | (PTRACE_EVENT_EXEC << 8)):
-        // Don't follow the child by default and resume
-        monitor->Resume(pid, SIGCONT);
+        if (log)
+            log->Printf ("ProcessMonitor::%s() received exec event, code = %d", __FUNCTION__, info->si_code ^ SIGTRAP);
+
+        message = ProcessMessage::Exec(pid);
         break;
 
     case (SIGTRAP | (PTRACE_EVENT_EXIT << 8)):
diff --git a/lldb/source/Plugins/Process/POSIX/POSIXThread.cpp b/lldb/source/Plugins/Process/POSIX/POSIXThread.cpp
index 54d0fa50303..794fd71e0ff 100644
--- a/lldb/source/Plugins/Process/POSIX/POSIXThread.cpp
+++ b/lldb/source/Plugins/Process/POSIX/POSIXThread.cpp
@@ -352,6 +352,10 @@ POSIXThread::Notify(const ProcessMessage &message)
     case ProcessMessage::eNewThreadMessage:
         ThreadNotify(message);
         break;
+
+    case ProcessMessage::eExecMessage:
+        ExecNotify(message);
+        break;
     }
 }
 
@@ -574,6 +578,12 @@ POSIXThread::GetRegisterIndexFromOffset(unsigned offset)
     return reg;
 }
 
+void
+POSIXThread::ExecNotify(const ProcessMessage &message)
+{
+    SetStopInfo (StopInfo::CreateStopReasonWithExec(*this));
+}
+
 const char *
 POSIXThread::GetRegisterName(unsigned reg)
 {
diff --git a/lldb/source/Plugins/Process/POSIX/POSIXThread.h b/lldb/source/Plugins/Process/POSIX/POSIXThread.h
index 66104c7332e..5490f1f1ea5 100644
--- a/lldb/source/Plugins/Process/POSIX/POSIXThread.h
+++ b/lldb/source/Plugins/Process/POSIX/POSIXThread.h
@@ -123,6 +123,7 @@ protected:
     void CrashNotify(const ProcessMessage &message);
     void ThreadNotify(const ProcessMessage &message);
     void ExitNotify(const ProcessMessage &message);
+    void ExecNotify(const ProcessMessage &message);
 
     lldb_private::Unwind *
     GetUnwinder();
diff --git a/lldb/source/Plugins/Process/POSIX/ProcessMessage.h b/lldb/source/Plugins/Process/POSIX/ProcessMessage.h
index 720c9e76939..40462d0f0e1 100644
--- a/lldb/source/Plugins/Process/POSIX/ProcessMessage.h
+++ b/lldb/source/Plugins/Process/POSIX/ProcessMessage.h
@@ -32,7 +32,8 @@ public:
         eBreakpointMessage,
         eWatchpointMessage,
         eCrashMessage,
-        eNewThreadMessage
+        eNewThreadMessage,
+        eExecMessage
     };
 
     enum CrashReason
@@ -133,6 +134,11 @@ public:
         return ProcessMessage(tid, eExitMessage, status);
     }
 
+    /// Indicates that the thread @p pid has exec'd.
+    static ProcessMessage Exec(lldb::tid_t tid) {
+        return ProcessMessage(tid, eExecMessage);
+    }
+
     int GetExitStatus() const {
         assert(GetKind() == eExitMessage || GetKind() == eLimboMessage);
         return m_status;
diff --git a/lldb/source/Plugins/Process/POSIX/ProcessPOSIX.cpp b/lldb/source/Plugins/Process/POSIX/ProcessPOSIX.cpp
index 5e6604458ad..b46c9375802 100644
--- a/lldb/source/Plugins/Process/POSIX/ProcessPOSIX.cpp
+++ b/lldb/source/Plugins/Process/POSIX/ProcessPOSIX.cpp
@@ -353,6 +353,31 @@ ProcessPOSIX::DoDestroy()
 }
 
 void
+ProcessPOSIX::DoDidExec()
+{
+    Target *target = &GetTarget();
+    if (target)
+    {
+        PlatformSP platform_sp (target->GetPlatform());
+        assert (platform_sp.get());
+        if (platform_sp)
+        {
+            ProcessInstanceInfo process_info;
+            platform_sp->GetProcessInfo(GetID(), process_info);
+            ModuleSP exe_module_sp;
+            FileSpecList executable_search_paths (Target::GetDefaultExecutableSearchPaths());
+            Error error = platform_sp->ResolveExecutable(process_info.GetExecutableFile(),
+                                                   target->GetArchitecture(),
+                                                   exe_module_sp,
+                                                   executable_search_paths.GetSize() ? &executable_search_paths : NULL);
+            if (!error.Success())
+                return;
+            target->SetExecutableModule(exe_module_sp, true);
+        }
+    }
+}
+
+void
 ProcessPOSIX::SendMessage(const ProcessMessage &message)
 {
     Mutex::Locker lock(m_message_mutex);
@@ -426,7 +451,7 @@ ProcessPOSIX::SendMessage(const ProcessMessage &message)
         break;
 
     case ProcessMessage::eNewThreadMessage:
-        {
+    {
         lldb::tid_t  new_tid = message.GetChildTID();
         if (WaitingForInitialStop(new_tid))
         {
@@ -437,9 +462,19 @@ ProcessPOSIX::SendMessage(const ProcessMessage &message)
         StopAllThreads(message.GetTID());
         SetPrivateState(eStateStopped);
         break;
-        }
     }
 
+    case ProcessMessage::eExecMessage:
+    {
+        assert(thread);
+        thread->SetState(eStateStopped);
+        StopAllThreads(message.GetTID());
+        SetPrivateState(eStateStopped);
+        break;
+    }
+    }
+
+
     m_message_queue.push(message);
 }
 
diff --git a/lldb/source/Plugins/Process/POSIX/ProcessPOSIX.h b/lldb/source/Plugins/Process/POSIX/ProcessPOSIX.h
index 080b089243e..790041be321 100644
--- a/lldb/source/Plugins/Process/POSIX/ProcessPOSIX.h
+++ b/lldb/source/Plugins/Process/POSIX/ProcessPOSIX.h
@@ -79,6 +79,9 @@ public:
     DoDestroy();
 
     virtual void
+    DoDidExec();
+
+    virtual void
     RefreshStateAfterStop();
 
     virtual bool