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llvm-project/lldb/tools/driver/IOChannel.cpp

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//===-- IOChannel.cpp -------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "IOChannel.h"
#include <map>
#include "lldb/API/SBCommandInterpreter.h"
#include "lldb/API/SBDebugger.h"
#include "lldb/API/SBError.h"
#include "lldb/API/SBEvent.h"
#include "lldb/API/SBFileSpec.h"
#include "lldb/API/SBHostOS.h"
#include "lldb/API/SBListener.h"
#include "lldb/API/SBStringList.h"
#include <string.h>
#include <limits.h>
using namespace lldb;
typedef std::map<EditLine *, std::string> PromptMap;
const char *g_default_prompt = "(lldb) ";
PromptMap g_prompt_map;
// Printing the following string causes libedit to back up to the beginning of the line & blank it out.
const char undo_prompt_string[4] = { (char) 13, (char) 27, (char) 91, (char) 75};
static const char*
el_prompt(EditLine *el)
{
PromptMap::const_iterator pos = g_prompt_map.find (el);
if (pos == g_prompt_map.end())
return g_default_prompt;
return pos->second.c_str();
}
const char *
IOChannel::GetPrompt ()
{
PromptMap::const_iterator pos = g_prompt_map.find (m_edit_line);
if (pos == g_prompt_map.end())
return g_default_prompt;
return pos->second.c_str();
}
unsigned char
IOChannel::ElCompletionFn (EditLine *e, int ch)
{
IOChannel *io_channel;
if (el_get(e, EL_CLIENTDATA, &io_channel) == 0)
{
return io_channel->HandleCompletion (e, ch);
}
else
{
return CC_ERROR;
}
}
unsigned char
IOChannel::HandleCompletion (EditLine *e, int ch)
{
assert (e == m_edit_line);
const LineInfo *line_info = el_line(m_edit_line);
SBStringList completions;
int page_size = 40;
int num_completions = m_driver->GetDebugger().GetCommandInterpreter().HandleCompletion (line_info->buffer,
line_info->cursor,
line_info->lastchar,
0,
-1,
completions);
if (num_completions == -1)
{
el_insertstr (m_edit_line, m_completion_key);
return CC_REDISPLAY;
}
else if (num_completions == -2)
{
el_deletestr (m_edit_line, line_info->cursor - line_info->buffer);
el_insertstr (m_edit_line, completions.GetStringAtIndex(0));
return CC_REDISPLAY;
}
// If we get a longer match display that first.
const char *completion_str = completions.GetStringAtIndex(0);
if (completion_str != NULL && *completion_str != '\0')
{
el_insertstr (m_edit_line, completion_str);
return CC_REDISPLAY;
}
if (num_completions > 1)
{
const char *comment = "\nAvailable completions:";
int num_elements = num_completions + 1;
OutWrite(comment, strlen (comment), NO_ASYNC);
if (num_completions < page_size)
{
for (int i = 1; i < num_elements; i++)
{
completion_str = completions.GetStringAtIndex(i);
OutWrite("\n\t", 2, NO_ASYNC);
OutWrite(completion_str, strlen (completion_str), NO_ASYNC);
}
OutWrite ("\n", 1, NO_ASYNC);
}
else
{
int cur_pos = 1;
char reply;
int got_char;
while (cur_pos < num_elements)
{
int endpoint = cur_pos + page_size;
if (endpoint > num_elements)
endpoint = num_elements;
for (; cur_pos < endpoint; cur_pos++)
{
completion_str = completions.GetStringAtIndex(cur_pos);
OutWrite("\n\t", 2, NO_ASYNC);
OutWrite(completion_str, strlen (completion_str), NO_ASYNC);
}
if (cur_pos >= num_elements)
{
OutWrite("\n", 1, NO_ASYNC);
break;
}
OutWrite("\nMore (Y/n/a): ", strlen ("\nMore (Y/n/a): "), NO_ASYNC);
reply = 'n';
got_char = el_getc(m_edit_line, &reply);
if (got_char == -1 || reply == 'n')
break;
if (reply == 'a')
page_size = num_elements - cur_pos;
}
}
}
if (num_completions == 0)
return CC_REFRESH_BEEP;
else
return CC_REDISPLAY;
}
IOChannel::IOChannel
(
FILE *editline_in,
FILE *editline_out,
FILE *out,
FILE *err,
Driver *driver
) :
SBBroadcaster ("IOChannel"),
m_output_mutex (),
m_enter_elgets_time (),
m_driver (driver),
m_read_thread (LLDB_INVALID_HOST_THREAD),
m_read_thread_should_exit (false),
m_out_file (out),
m_err_file (err),
m_command_queue (),
m_completion_key ("\t"),
m_edit_line (::el_init (SBHostOS::GetProgramFileSpec().GetFilename(), editline_in, editline_out, editline_out)),
m_history (history_init()),
m_history_event(),
m_getting_command (false),
m_expecting_prompt (false),
m_prompt_str (),
m_refresh_request_pending (false)
{
assert (m_edit_line);
::el_set (m_edit_line, EL_PROMPT, el_prompt);
::el_set (m_edit_line, EL_EDITOR, "emacs");
::el_set (m_edit_line, EL_HIST, history, m_history);
// Source $PWD/.editrc then $HOME/.editrc
::el_source (m_edit_line, NULL);
el_set (m_edit_line, EL_ADDFN, "lldb_complete",
"LLDB completion function",
IOChannel::ElCompletionFn);
el_set (m_edit_line, EL_BIND, m_completion_key, "lldb_complete", NULL);
el_set (m_edit_line, EL_BIND, "^r", "em-inc-search-prev", NULL); // Cycle through backwards search, entering string
el_set (m_edit_line, EL_CLIENTDATA, this);
assert (m_history);
::history (m_history, &m_history_event, H_SETSIZE, 800);
::history (m_history, &m_history_event, H_SETUNIQUE, 1);
// Load history
HistorySaveLoad (false);
// Set up mutex to make sure OutErr, OutWrite and RefreshPrompt do not interfere
// with each other when writing.
int error;
::pthread_mutexattr_t attr;
error = ::pthread_mutexattr_init (&attr);
assert (error == 0);
error = ::pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
assert (error == 0);
error = ::pthread_mutex_init (&m_output_mutex, &attr);
assert (error == 0);
error = ::pthread_mutexattr_destroy (&attr);
assert (error == 0);
// Initialize time that ::el_gets was last called.
m_enter_elgets_time.tv_sec = 0;
m_enter_elgets_time.tv_usec = 0;
}
IOChannel::~IOChannel ()
{
// Save history
HistorySaveLoad (true);
if (m_history != NULL)
{
::history_end (m_history);
m_history = NULL;
}
if (m_edit_line != NULL)
{
::el_end (m_edit_line);
m_edit_line = NULL;
}
::pthread_mutex_destroy (&m_output_mutex);
}
void
IOChannel::HistorySaveLoad (bool save)
{
if (m_history != NULL)
{
char history_path[PATH_MAX];
::snprintf (history_path, sizeof(history_path), "~/.%s-history", SBHostOS::GetProgramFileSpec().GetFilename());
if ((size_t)SBFileSpec::ResolvePath (history_path, history_path, sizeof(history_path)) < sizeof(history_path) - 1)
{
const char *path_ptr = history_path;
if (save)
::history (m_history, &m_history_event, H_SAVE, path_ptr);
else
::history (m_history, &m_history_event, H_LOAD, path_ptr);
}
}
}
void
IOChannel::LibeditOutputBytesReceived (void *baton, const void *src, size_t src_len)
{
// Make this a member variable.
// static std::string prompt_str;
IOChannel *io_channel = (IOChannel *) baton;
IOLocker locker (io_channel->m_output_mutex);
const char *bytes = (const char *) src;
if (io_channel->IsGettingCommand() && io_channel->m_expecting_prompt)
{
io_channel->m_prompt_str.append (bytes, src_len);
// Log this to make sure the prompt is really what you think it is.
if (io_channel->m_prompt_str.find (el_prompt(io_channel->m_edit_line)) == 0)
{
io_channel->m_expecting_prompt = false;
io_channel->m_refresh_request_pending = false;
io_channel->OutWrite (io_channel->m_prompt_str.c_str(),
io_channel->m_prompt_str.size(), NO_ASYNC);
io_channel->m_prompt_str.clear();
}
}
else
{
if (io_channel->m_prompt_str.size() > 0)
io_channel->m_prompt_str.clear();
std::string tmp_str (bytes, src_len);
if (tmp_str.find (el_prompt (io_channel->m_edit_line)) == 0)
io_channel->m_refresh_request_pending = false;
io_channel->OutWrite (bytes, src_len, NO_ASYNC);
}
}
bool
IOChannel::LibeditGetInput (std::string &new_line)
{
if (m_edit_line != NULL)
{
int line_len = 0;
// Set boolean indicating whether or not el_gets is trying to get input (i.e. whether or not to attempt
// to refresh the prompt after writing data).
SetGettingCommand (true);
m_expecting_prompt = true;
// Call el_gets to prompt the user and read the user's input.
const char *line = ::el_gets (m_edit_line, &line_len);
// Re-set the boolean indicating whether or not el_gets is trying to get input.
SetGettingCommand (false);
if (line)
{
// strip any newlines off the end of the string...
while (line_len > 0 && (line[line_len - 1] == '\n' || line[line_len - 1] == '\r'))
--line_len;
if (line_len > 0)
{
::history (m_history, &m_history_event, H_ENTER, line);
new_line.assign (line, line_len); // Omit the newline
}
else
{
// Someone just hit ENTER, return the empty string
new_line.clear();
}
// Return true to indicate success even if a string is empty
return true;
}
}
// Return false to indicate failure. This can happen when the file handle
// is closed (EOF).
new_line.clear();
return false;
}
void *
IOChannel::IOReadThread (void *ptr)
{
IOChannel *myself = static_cast<IOChannel *> (ptr);
myself->Run();
return NULL;
}
void
IOChannel::Run ()
{
SBListener listener("IOChannel::Run");
std::string new_line;
SBBroadcaster interpreter_broadcaster (m_driver->GetDebugger().GetCommandInterpreter().GetBroadcaster());
listener.StartListeningForEvents (interpreter_broadcaster,
SBCommandInterpreter::eBroadcastBitResetPrompt |
SBCommandInterpreter::eBroadcastBitThreadShouldExit |
SBCommandInterpreter::eBroadcastBitQuitCommandReceived);
listener.StartListeningForEvents (*this,
IOChannel::eBroadcastBitThreadShouldExit);
listener.StartListeningForEvents (*m_driver,
Driver::eBroadcastBitReadyForInput |
Driver::eBroadcastBitThreadShouldExit);
// Let anyone know that the IO channel is up and listening and ready for events
BroadcastEventByType (eBroadcastBitThreadDidStart);
bool done = false;
while (!done)
{
SBEvent event;
listener.WaitForEvent (UINT32_MAX, event);
if (!event.IsValid())
continue;
const uint32_t event_type = event.GetType();
if (event.GetBroadcaster().IsValid())
{
if (event.BroadcasterMatchesPtr (m_driver))
{
if (event_type & Driver::eBroadcastBitReadyForInput)
{
std::string line;
if (CommandQueueIsEmpty())
{
if (LibeditGetInput(line) == false)
{
// EOF or some other file error occurred
done = true;
continue;
}
}
else
{
GetCommandFromQueue (line);
}
// TO BE DONE: FIGURE OUT WHICH COMMANDS SHOULD NOT BE REPEATED IF USER PRESSES PLAIN 'RETURN'
// AND TAKE CARE OF THAT HERE.
SBEvent line_event(IOChannel::eBroadcastBitHasUserInput,
line.c_str(),
line.size());
BroadcastEvent (line_event);
}
else if (event_type & Driver::eBroadcastBitThreadShouldExit)
{
done = true;
break;
}
}
else if (event.BroadcasterMatchesRef (interpreter_broadcaster))
{
switch (event_type)
{
case SBCommandInterpreter::eBroadcastBitResetPrompt:
{
const char *new_prompt = SBEvent::GetCStringFromEvent (event);
if (new_prompt)
g_prompt_map[m_edit_line] = new_prompt;
}
break;
case SBCommandInterpreter::eBroadcastBitThreadShouldExit:
case SBCommandInterpreter::eBroadcastBitQuitCommandReceived:
done = true;
break;
}
}
else if (event.BroadcasterMatchesPtr (this))
{
if (event_type & IOChannel::eBroadcastBitThreadShouldExit)
{
done = true;
break;
}
}
}
}
BroadcastEventByType (IOChannel::eBroadcastBitThreadDidExit);
m_driver = NULL;
m_read_thread = NULL;
}
bool
IOChannel::Start ()
{
if (IS_VALID_LLDB_HOST_THREAD(m_read_thread))
return true;
m_read_thread = SBHostOS::ThreadCreate ("<lldb.driver.commandline_io>", IOChannel::IOReadThread, this,
NULL);
return (IS_VALID_LLDB_HOST_THREAD(m_read_thread));
}
bool
IOChannel::Stop ()
{
if (!IS_VALID_LLDB_HOST_THREAD(m_read_thread))
return true;
BroadcastEventByType (eBroadcastBitThreadShouldExit);
// Don't call Host::ThreadCancel since el_gets won't respond to this
// function call -- the thread will just die and all local variables in
// IOChannel::Run() won't get destructed down which is bad since there is
// a local listener holding onto broadcasters... To ensure proper shutdown,
// a ^D (control-D) sequence (0x04) should be written to other end of the
// the "in" file handle that was passed into the contructor as closing the
// file handle doesn't seem to make el_gets() exit....
return SBHostOS::ThreadJoin (m_read_thread, NULL, NULL);
}
void
IOChannel::RefreshPrompt ()
{
// If we are not in the middle of getting input from the user, there is no need to
// refresh the prompt.
IOLocker locker (m_output_mutex);
if (! IsGettingCommand())
return;
// If we haven't finished writing the prompt, there's no need to refresh it.
if (m_expecting_prompt)
return;
if (m_refresh_request_pending)
return;
::el_set (m_edit_line, EL_REFRESH);
m_refresh_request_pending = true;
}
void
IOChannel::OutWrite (const char *buffer, size_t len, bool asynchronous)
{
if (len == 0)
return;
// Use the mutex to make sure OutWrite and ErrWrite do not interfere with each other's output.
IOLocker locker (m_output_mutex);
if (m_driver->EditlineReaderIsTop() && asynchronous)
::fwrite (undo_prompt_string, 1, 4, m_out_file);
::fwrite (buffer, 1, len, m_out_file);
if (asynchronous)
m_driver->GetDebugger().NotifyTopInputReader (eInputReaderAsynchronousOutputWritten);
}
void
IOChannel::ErrWrite (const char *buffer, size_t len, bool asynchronous)
{
if (len == 0)
return;
// Use the mutex to make sure OutWrite and ErrWrite do not interfere with each other's output.
IOLocker locker (m_output_mutex);
if (asynchronous)
::fwrite (undo_prompt_string, 1, 4, m_err_file);
::fwrite (buffer, 1, len, m_err_file);
if (asynchronous)
m_driver->GetDebugger().NotifyTopInputReader (eInputReaderAsynchronousOutputWritten);
}
void
IOChannel::AddCommandToQueue (const char *command)
{
m_command_queue.push (std::string(command));
}
bool
IOChannel::GetCommandFromQueue (std::string &cmd)
{
if (m_command_queue.empty())
return false;
cmd.swap(m_command_queue.front());
m_command_queue.pop ();
return true;
}
int
IOChannel::CommandQueueSize () const
{
return m_command_queue.size();
}
void
IOChannel::ClearCommandQueue ()
{
while (!m_command_queue.empty())
m_command_queue.pop();
}
bool
IOChannel::CommandQueueIsEmpty () const
{
return m_command_queue.empty();
}
bool
IOChannel::IsGettingCommand () const
{
return m_getting_command;
}
void
IOChannel::SetGettingCommand (bool new_value)
{
m_getting_command = new_value;
}
IOLocker::IOLocker (pthread_mutex_t &mutex) :
m_mutex_ptr (&mutex)
{
if (m_mutex_ptr)
::pthread_mutex_lock (m_mutex_ptr);
}
IOLocker::~IOLocker ()
{
if (m_mutex_ptr)
::pthread_mutex_unlock (m_mutex_ptr);
}
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