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Avoiding a potentially memory allocating code path in the Python InputReader's CTRL+C handling code path - this can potentially cause a deadlock while interrupting a user-made Python command 

llvm-svn: 180726
This commit is contained in:
Enrico Granata 2013-04-29 19:38:17 +00:00
parent b39478e8ec
commit d987cdf123
1 changed files with 36 additions and 17 deletions
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41
lldb/source/Interpreter/ScriptInterpreterPython.cpp
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@ -277,8 +277,6 @@ ScriptInterpreterPython::PythonInputReaderManager::InputReaderCallback (void *ba
if (script_interpreter->m_script_lang != eScriptLanguagePython) if (script_interpreter->m_script_lang != eScriptLanguagePython)
return 0; return 0;
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
switch (notification) switch (notification)
{ {
case eInputReaderActivate: case eInputReaderActivate:
@ -843,13 +841,12 @@ ScriptInterpreterPython::InputReaderCallback
if (script_interpreter->m_script_lang != eScriptLanguagePython) if (script_interpreter->m_script_lang != eScriptLanguagePython)
return 0; return 0;
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode();
switch (notification) switch (notification)
{ {
case eInputReaderActivate: case eInputReaderActivate:
{ {
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode();
if (!batch_mode) if (!batch_mode)
{ {
out_stream->Printf ("Python Interactive Interpreter. To exit, type 'quit()', 'exit()' or Ctrl-D.\n"); out_stream->Printf ("Python Interactive Interpreter. To exit, type 'quit()', 'exit()' or Ctrl-D.\n");
@ -1263,13 +1260,13 @@ ScriptInterpreterPython::GenerateBreakpointOptionsCommandCallback
{ {
static StringList commands_in_progress; static StringList commands_in_progress;
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode();
switch (notification) switch (notification)
{ {
case eInputReaderActivate: case eInputReaderActivate:
{ {
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode();
commands_in_progress.Clear(); commands_in_progress.Clear();
if (!batch_mode) if (!batch_mode)
{ {
@ -1285,11 +1282,15 @@ ScriptInterpreterPython::GenerateBreakpointOptionsCommandCallback
break; break;
case eInputReaderReactivate: case eInputReaderReactivate:
{
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode();
if (reader.GetPrompt() && !batch_mode) if (reader.GetPrompt() && !batch_mode)
{ {
out_stream->Printf ("%s", reader.GetPrompt()); out_stream->Printf ("%s", reader.GetPrompt());
out_stream->Flush (); out_stream->Flush ();
} }
}
break; break;
case eInputReaderAsynchronousOutputWritten: case eInputReaderAsynchronousOutputWritten:
@ -1297,6 +1298,8 @@ ScriptInterpreterPython::GenerateBreakpointOptionsCommandCallback
case eInputReaderGotToken: case eInputReaderGotToken:
{ {
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode();
std::string temp_string (bytes, bytes_len); std::string temp_string (bytes, bytes_len);
commands_in_progress.AppendString (temp_string.c_str()); commands_in_progress.AppendString (temp_string.c_str());
if (!reader.IsDone() && reader.GetPrompt() && !batch_mode) if (!reader.IsDone() && reader.GetPrompt() && !batch_mode)
@ -1320,6 +1323,9 @@ ScriptInterpreterPython::GenerateBreakpointOptionsCommandCallback
case eInputReaderDone: case eInputReaderDone:
{ {
bool batch_mode = notification == eInputReaderDone ?
reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode() :
true;
BreakpointOptions *bp_options = (BreakpointOptions *)baton; BreakpointOptions *bp_options = (BreakpointOptions *)baton;
std::unique_ptr<BreakpointOptions::CommandData> data_ap(new BreakpointOptions::CommandData()); std::unique_ptr<BreakpointOptions::CommandData> data_ap(new BreakpointOptions::CommandData());
data_ap->user_source.AppendList (commands_in_progress); data_ap->user_source.AppendList (commands_in_progress);
@ -1336,6 +1342,7 @@ ScriptInterpreterPython::GenerateBreakpointOptionsCommandCallback
} }
else if (!batch_mode) else if (!batch_mode)
{ {
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
out_stream->Printf ("Warning: No command attached to breakpoint.\n"); out_stream->Printf ("Warning: No command attached to breakpoint.\n");
out_stream->Flush(); out_stream->Flush();
} }
@ -1344,6 +1351,7 @@ ScriptInterpreterPython::GenerateBreakpointOptionsCommandCallback
{ {
if (!batch_mode) if (!batch_mode)
{ {
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
out_stream->Printf ("Warning: Unable to find script intepreter; no command attached to breakpoint.\n"); out_stream->Printf ("Warning: Unable to find script intepreter; no command attached to breakpoint.\n");
out_stream->Flush(); out_stream->Flush();
} }
@ -1369,13 +1377,13 @@ ScriptInterpreterPython::GenerateWatchpointOptionsCommandCallback
{ {
static StringList commands_in_progress; static StringList commands_in_progress;
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode();
switch (notification) switch (notification)
{ {
case eInputReaderActivate: case eInputReaderActivate:
{ {
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode();
commands_in_progress.Clear(); commands_in_progress.Clear();
if (!batch_mode) if (!batch_mode)
{ {
@ -1391,11 +1399,15 @@ ScriptInterpreterPython::GenerateWatchpointOptionsCommandCallback
break; break;
case eInputReaderReactivate: case eInputReaderReactivate:
{
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode();
if (reader.GetPrompt() && !batch_mode) if (reader.GetPrompt() && !batch_mode)
{ {
out_stream->Printf ("%s", reader.GetPrompt()); out_stream->Printf ("%s", reader.GetPrompt());
out_stream->Flush (); out_stream->Flush ();
} }
}
break; break;
case eInputReaderAsynchronousOutputWritten: case eInputReaderAsynchronousOutputWritten:
@ -1403,6 +1415,8 @@ ScriptInterpreterPython::GenerateWatchpointOptionsCommandCallback
case eInputReaderGotToken: case eInputReaderGotToken:
{ {
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode();
std::string temp_string (bytes, bytes_len); std::string temp_string (bytes, bytes_len);
commands_in_progress.AppendString (temp_string.c_str()); commands_in_progress.AppendString (temp_string.c_str());
if (!reader.IsDone() && reader.GetPrompt() && !batch_mode) if (!reader.IsDone() && reader.GetPrompt() && !batch_mode)
@ -1426,6 +1440,9 @@ ScriptInterpreterPython::GenerateWatchpointOptionsCommandCallback
case eInputReaderDone: case eInputReaderDone:
{ {
bool batch_mode = notification == eInputReaderDone ?
reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode() :
true;
WatchpointOptions *wp_options = (WatchpointOptions *)baton; WatchpointOptions *wp_options = (WatchpointOptions *)baton;
std::unique_ptr<WatchpointOptions::CommandData> data_ap(new WatchpointOptions::CommandData()); std::unique_ptr<WatchpointOptions::CommandData> data_ap(new WatchpointOptions::CommandData());
data_ap->user_source.AppendList (commands_in_progress); data_ap->user_source.AppendList (commands_in_progress);
@ -1442,6 +1459,7 @@ ScriptInterpreterPython::GenerateWatchpointOptionsCommandCallback
} }
else if (!batch_mode) else if (!batch_mode)
{ {
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
out_stream->Printf ("Warning: No command attached to breakpoint.\n"); out_stream->Printf ("Warning: No command attached to breakpoint.\n");
out_stream->Flush(); out_stream->Flush();
} }
@ -1450,6 +1468,7 @@ ScriptInterpreterPython::GenerateWatchpointOptionsCommandCallback
{ {
if (!batch_mode) if (!batch_mode)
{ {
StreamSP out_stream = reader.GetDebugger().GetAsyncOutputStream();
out_stream->Printf ("Warning: Unable to find script intepreter; no command attached to breakpoint.\n"); out_stream->Printf ("Warning: Unable to find script intepreter; no command attached to breakpoint.\n");
out_stream->Flush(); out_stream->Flush();
} }