[lldb] Move ScriptedProcess private state update to implementation

While debugging a Scripted Process, in order to update its state and
work nicely with lldb's execution model, it needs to toggle its private
state from running to stopped, which will result in broadcasting a
process state changed event to the debugger listener.

Originally, this state update was done systematically in the Scripted
Process C++ plugin, however in order to make scripted process
interactive, we need to be able to update their state dynamically.

This patch makes use of the recent addition of the
SBProcess::ForceScriptedState to programatically, and moves the
process private state update to the python implementation of the resume
method instead of doing it in ScriptedProcess::DoResume.

This patch also removes the unused ShouldStop & Stop scripted
process APIs, and adds new ScriptedInterface transform methods for
boolean arguments. This allow the user to programmatically decide if
after running the process, we should stop it (which is the default setting).

Differential Revision: https://reviews.llvm.org/D145295

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>

1 files changed, 9 insertions, 45 deletions

diff --git a/lldb/source/Plugins/Process/scripted/ScriptedProcess.cpp b/lldb/source/Plugins/Process/scripted/ScriptedProcess.cpp
index 23ff881..3c2e8f5 100644
--- a/lldb/source/Plugins/Process/scripted/ScriptedProcess.cpp
+++ b/lldb/source/Plugins/Process/scripted/ScriptedProcess.cpp
@@ -150,22 +150,15 @@ Status ScriptedProcess::DoLoadCore() {
 
 Status ScriptedProcess::DoLaunch(Module *exe_module,
                                  ProcessLaunchInfo &launch_info) {
-  /* FIXME: This doesn't reflect how lldb actually launches a process.
-           In reality, it attaches to debugserver, then resume the process. */
+  LLDB_LOGF(GetLog(LLDBLog::Process), "ScriptedProcess::%s launching process", __FUNCTION__);
+  
+  /* MARK: This doesn't reflect how lldb actually launches a process.
+           In reality, it attaches to debugserver, then resume the process.
+           That's not true in all cases.  If debugserver is remote, lldb
+           asks debugserver to launch the process for it. */
   Status error = GetInterface().Launch();
-  SetPrivateState(eStateRunning);
-
-  if (error.Fail())
-    return error;
-
-  // TODO: Fetch next state from stopped event queue then send stop event
-  //  const StateType state = SetThreadStopInfo(response);
-  //  if (state != eStateInvalid) {
-  //    SetPrivateState(state);
-
   SetPrivateState(eStateStopped);
-
-  return {};
+  return error;
 }
 
 void ScriptedProcess::DidLaunch() { m_pid = GetInterface().GetProcessID(); }
@@ -177,25 +170,9 @@ void ScriptedProcess::DidResume() {
 }
 
 Status ScriptedProcess::DoResume() {
-  Log *log = GetLog(LLDBLog::Process);
-  // FIXME: Fetch data from thread.
-  const StateType thread_resume_state = eStateRunning;
-  LLDB_LOGF(log, "ScriptedProcess::%s thread_resume_state = %s", __FUNCTION__,
-            StateAsCString(thread_resume_state));
-
-  bool resume = (thread_resume_state == eStateRunning);
-  assert(thread_resume_state == eStateRunning && "invalid thread resume state");
+  LLDB_LOGF(GetLog(LLDBLog::Process), "ScriptedProcess::%s resuming process", __FUNCTION__);
 
-  Status error;
-  if (resume) {
-    LLDB_LOGF(log, "ScriptedProcess::%s sending resume", __FUNCTION__);
-
-    SetPrivateState(eStateRunning);
-    SetPrivateState(eStateStopped);
-    error = GetInterface().Resume();
-  }
-
-  return error;
+  return GetInterface().Resume();
 }
 
 Status ScriptedProcess::DoAttach(const ProcessAttachInfo &attach_info) {
@@ -226,19 +203,6 @@ void ScriptedProcess::DidAttach(ArchSpec &process_arch) {
   process_arch = GetArchitecture();
 }
 
-Status ScriptedProcess::DoStop() {
-  Log *log = GetLog(LLDBLog::Process);
-
-  if (GetInterface().ShouldStop()) {
-    SetPrivateState(eStateStopped);
-    LLDB_LOGF(log, "ScriptedProcess::%s Immediate stop", __FUNCTION__);
-    return {};
-  }
-
-  LLDB_LOGF(log, "ScriptedProcess::%s Delayed stop", __FUNCTION__);
-  return GetInterface().Stop();
-}
-
 Status ScriptedProcess::DoDestroy() { return Status(); }
 
 bool ScriptedProcess::IsAlive() { return GetInterface().IsAlive(); }