update ScriptInterpreterPython to use File, not FILE*

Summary:
ScriptInterpreterPython needs to save and restore sys.stdout and
friends when LLDB runs a python script.

It currently does this using FILE*, which is not optimal.  If
whatever was in sys.stdout can not be represented as a FILE*, then
it will not be restored correctly when the script is finished.

It also means that if the debugger's own output stream is not
representable as a file, ScriptInterpreterPython will not be able
to redirect python's  output correctly.

This patch updates ScriptInterpreterPython to represent files with
lldb_private::File, and to represent whatever the user had in
sys.stdout as simply a PythonObject.

This will make lldb interoperate better with other scripts or programs
that need to manipulate sys.stdout.

Reviewers: JDevlieghere, jasonmolenda, labath

Reviewed By: labath

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D68962

llvm-svn: 374964

1 files changed, 3 insertions, 6 deletions

diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
index 6a3604c098d..18397d00dca 100644
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -973,34 +973,31 @@ void Debugger::AdoptTopIOHandlerFilesIfInvalid(FileSP &in, StreamFileSP &out,
   std::lock_guard<std::recursive_mutex> guard(m_input_reader_stack.GetMutex());
   IOHandlerSP top_reader_sp(m_input_reader_stack.Top());
   // If no STDIN has been set, then set it appropriately
-  if (!in) {
+  if (!in || !in->IsValid()) {
     if (top_reader_sp)
       in = top_reader_sp->GetInputFileSP();
     else
       in = GetInputFileSP();
-
     // If there is nothing, use stdin
     if (!in)
       in = std::make_shared<NativeFile>(stdin, false);
   }
   // If no STDOUT has been set, then set it appropriately
-  if (!out) {
+  if (!out || !out->GetFile().IsValid()) {
     if (top_reader_sp)
       out = top_reader_sp->GetOutputStreamFileSP();
     else
       out = GetOutputStreamSP();
-
     // If there is nothing, use stdout
     if (!out)
       out = std::make_shared<StreamFile>(stdout, false);
   }
   // If no STDERR has been set, then set it appropriately
-  if (!err) {
+  if (!err || !err->GetFile().IsValid()) {
     if (top_reader_sp)
       err = top_reader_sp->GetErrorStreamFileSP();
     else
       err = GetErrorStreamSP();
-
     // If there is nothing, use stderr
     if (!err)
       err = std::make_shared<StreamFile>(stderr, false);