caio/clang-p2996
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update ScriptInterpreterPython to use File, not FILE*

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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
This commit is contained in:
Lawrence D'Anna
2019-10-16 01:58:15 +00:00
parent 9d10b9d99b
commit b07823f3e2
4 changed files with 58 additions and 66 deletions
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87
lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
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@@ -370,7 +370,7 @@ void ScriptInterpreterPython::Terminate() {}
ScriptInterpreterPythonImpl::Locker::Locker(
ScriptInterpreterPythonImpl *py_interpreter, uint16_t on_entry,
uint16_t on_leave, FILE *in, FILE *out, FILE *err)
uint16_t on_leave, FileSP in, FileSP out, FileSP err)
: ScriptInterpreterLocker(),
m_teardown_session((on_leave & TearDownSession) == TearDownSession),
m_python_interpreter(py_interpreter) {
@@ -400,8 +400,8 @@ bool ScriptInterpreterPythonImpl::Locker::DoAcquireLock() {
}
bool ScriptInterpreterPythonImpl::Locker::DoInitSession(uint16_t on_entry_flags,
FILE *in, FILE *out,
FILE *err) {
FileSP in, FileSP out,
FileSP err) {
if (!m_python_interpreter)
return false;
return m_python_interpreter->EnterSession(on_entry_flags, in, out, err);
@@ -636,28 +636,31 @@ void ScriptInterpreterPythonImpl::LeaveSession() {
m_session_is_active = false;
}
bool ScriptInterpreterPythonImpl::SetStdHandle(File &file, const char *py_name,
PythonFile &save_file,
bool ScriptInterpreterPythonImpl::SetStdHandle(FileSP file_sp,
const char *py_name,
PythonObject &save_file,
const char *mode) {
if (file.IsValid()) {
// Flush the file before giving it to python to avoid interleaved output.
file.Flush();
PythonDictionary &sys_module_dict = GetSysModuleDictionary();
save_file = sys_module_dict.GetItemForKey(PythonString(py_name))
.AsType<PythonFile>();
PythonFile new_file(file, mode);
sys_module_dict.SetItemForKey(PythonString(py_name), new_file);
return true;
} else
if (!file_sp || !*file_sp) {
save_file.Reset();
return false;
return false;
}
File &file = *file_sp;
// Flush the file before giving it to python to avoid interleaved output.
file.Flush();
PythonDictionary &sys_module_dict = GetSysModuleDictionary();
save_file = sys_module_dict.GetItemForKey(PythonString(py_name));
PythonFile new_file(file, mode);
sys_module_dict.SetItemForKey(PythonString(py_name), new_file);
return true;
}
bool ScriptInterpreterPythonImpl::EnterSession(uint16_t on_entry_flags,
FILE *in, FILE *out, FILE *err) {
FileSP in_sp, FileSP out_sp,
FileSP err_sp) {
// If we have already entered the session, without having officially 'left'
// it, then there is no need to 'enter' it again.
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SCRIPT));
@@ -706,33 +709,29 @@ bool ScriptInterpreterPythonImpl::EnterSession(uint16_t on_entry_flags,
PythonDictionary &sys_module_dict = GetSysModuleDictionary();
if (sys_module_dict.IsValid()) {
NativeFile in_file(in, false);
NativeFile out_file(out, false);
NativeFile err_file(err, false);
lldb::FileSP in_sp;
lldb::StreamFileSP out_sp;
lldb::StreamFileSP err_sp;
if (!in_file.IsValid() || !out_file.IsValid() || !err_file.IsValid())
m_debugger.AdoptTopIOHandlerFilesIfInvalid(in_sp, out_sp, err_sp);
lldb::FileSP top_in_sp;
lldb::StreamFileSP top_out_sp, top_err_sp;
if (!in_sp || !out_sp || !err_sp || !*in_sp || !*out_sp || !*err_sp)
m_debugger.AdoptTopIOHandlerFilesIfInvalid(top_in_sp, top_out_sp,
top_err_sp);
if (on_entry_flags & Locker::NoSTDIN) {
m_saved_stdin.Reset();
} else {
if (!SetStdHandle(in_file, "stdin", m_saved_stdin, "r")) {
if (in_sp)
SetStdHandle(*in_sp, "stdin", m_saved_stdin, "r");
if (!SetStdHandle(in_sp, "stdin", m_saved_stdin, "r")) {
if (top_in_sp)
SetStdHandle(top_in_sp, "stdin", m_saved_stdin, "r");
}
}
if (!SetStdHandle(out_file, "stdout", m_saved_stdout, "w")) {
if (out_sp)
SetStdHandle(out_sp->GetFile(), "stdout", m_saved_stdout, "w");
if (!SetStdHandle(out_sp, "stdout", m_saved_stdout, "w")) {
if (top_out_sp)
SetStdHandle(top_out_sp->GetFileSP(), "stdout", m_saved_stdout, "w");
}
if (!SetStdHandle(err_file, "stderr", m_saved_stderr, "w")) {
if (err_sp)
SetStdHandle(err_sp->GetFile(), "stderr", m_saved_stderr, "w");
if (!SetStdHandle(err_sp, "stderr", m_saved_stderr, "w")) {
if (top_err_sp)
SetStdHandle(top_err_sp->GetFileSP(), "stderr", m_saved_stderr, "w");
}
}
@@ -909,9 +908,6 @@ bool ScriptInterpreterPythonImpl::ExecuteOneLine(
error_file_sp = output_file_sp = std::make_shared<StreamFile>(std::move(nullout.get()));
}
FILE *in_file = input_file_sp->GetStream();
FILE *out_file = output_file_sp->GetFile().GetStream();
FILE *err_file = error_file_sp->GetFile().GetStream();
bool success = false;
{
// WARNING! It's imperative that this RAII scope be as tight as
@@ -927,8 +923,8 @@ bool ScriptInterpreterPythonImpl::ExecuteOneLine(
Locker::AcquireLock | Locker::InitSession |
(options.GetSetLLDBGlobals() ? Locker::InitGlobals : 0) |
((result && result->GetInteractive()) ? 0 : Locker::NoSTDIN),
Locker::FreeAcquiredLock | Locker::TearDownSession, in_file, out_file,
err_file);
Locker::FreeAcquiredLock | Locker::TearDownSession, input_file_sp,
output_file_sp->GetFileSP(), error_file_sp->GetFileSP());
// Find the correct script interpreter dictionary in the main module.
PythonDictionary &session_dict = GetSessionDictionary();
@@ -955,9 +951,8 @@ bool ScriptInterpreterPythonImpl::ExecuteOneLine(
}
// Flush our output and error file handles
::fflush(out_file);
if (out_file != err_file)
::fflush(err_file);
output_file_sp->Flush();
error_file_sp->Flush();
}
if (join_read_thread) {