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llvm-project/lldb/source/Target/Thread.cpp

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//===-- Thread.cpp ----------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/lldb-python.h"
#include "lldb/lldb-private-log.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/State.h"
#include "lldb/Core/Stream.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/RegularExpression.h"
#include "lldb/Host/Host.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/ObjCLanguageRuntime.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StopInfo.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlan.h"
#include "lldb/Target/ThreadPlanCallFunction.h"
#include "lldb/Target/ThreadPlanBase.h"
#include "lldb/Target/ThreadPlanStepInstruction.h"
#include "lldb/Target/ThreadPlanStepOut.h"
#include "lldb/Target/ThreadPlanStepOverBreakpoint.h"
#include "lldb/Target/ThreadPlanStepThrough.h"
#include "lldb/Target/ThreadPlanStepInRange.h"
#include "lldb/Target/ThreadPlanStepOverRange.h"
#include "lldb/Target/ThreadPlanRunToAddress.h"
#include "lldb/Target/ThreadPlanStepUntil.h"
#include "lldb/Target/ThreadSpec.h"
#include "lldb/Target/Unwind.h"
#include "Plugins/Process/Utility/UnwindLLDB.h"
#include "UnwindMacOSXFrameBackchain.h"
using namespace lldb;
using namespace lldb_private;
const ThreadPropertiesSP &
Thread::GetGlobalProperties()
{
static ThreadPropertiesSP g_settings_sp;
if (!g_settings_sp)
g_settings_sp.reset (new ThreadProperties (true));
return g_settings_sp;
}
static PropertyDefinition
g_properties[] =
{
{ "step-avoid-regexp", OptionValue::eTypeRegex , true , REG_EXTENDED, "^std::", NULL, "A regular expression defining functions step-in won't stop in." },
{ "trace-thread", OptionValue::eTypeBoolean, false, false, NULL, NULL, "If true, this thread will single-step and log execution." },
{ NULL , OptionValue::eTypeInvalid, false, 0 , NULL, NULL, NULL }
};
enum {
ePropertyStepAvoidRegex,
ePropertyEnableThreadTrace
};
class ThreadOptionValueProperties : public OptionValueProperties
{
public:
ThreadOptionValueProperties (const ConstString &name) :
OptionValueProperties (name)
{
}
// This constructor is used when creating ThreadOptionValueProperties when it
// is part of a new lldb_private::Thread instance. It will copy all current
// global property values as needed
ThreadOptionValueProperties (ThreadProperties *global_properties) :
OptionValueProperties(*global_properties->GetValueProperties())
{
}
virtual const Property *
GetPropertyAtIndex (const ExecutionContext *exe_ctx, bool will_modify, uint32_t idx) const
{
// When gettings the value for a key from the thread options, we will always
// try and grab the setting from the current thread if there is one. Else we just
// use the one from this instance.
if (exe_ctx)
{
Thread *thread = exe_ctx->GetThreadPtr();
if (thread)
{
ThreadOptionValueProperties *instance_properties = static_cast<ThreadOptionValueProperties *>(thread->GetValueProperties().get());
if (this != instance_properties)
return instance_properties->ProtectedGetPropertyAtIndex (idx);
}
}
return ProtectedGetPropertyAtIndex (idx);
}
};
ThreadProperties::ThreadProperties (bool is_global) :
Properties ()
{
if (is_global)
{
m_collection_sp.reset (new ThreadOptionValueProperties(ConstString("thread")));
m_collection_sp->Initialize(g_properties);
}
else
m_collection_sp.reset (new ThreadOptionValueProperties(Thread::GetGlobalProperties().get()));
}
ThreadProperties::~ThreadProperties()
{
}
const RegularExpression *
ThreadProperties::GetSymbolsToAvoidRegexp()
{
const uint32_t idx = ePropertyStepAvoidRegex;
return m_collection_sp->GetPropertyAtIndexAsOptionValueRegex (NULL, idx);
}
bool
ThreadProperties::GetTraceEnabledState() const
{
const uint32_t idx = ePropertyEnableThreadTrace;
return m_collection_sp->GetPropertyAtIndexAsBoolean (NULL, idx, g_properties[idx].default_uint_value != 0);
}
//------------------------------------------------------------------
// Thread Event Data
//------------------------------------------------------------------
const ConstString &
Thread::ThreadEventData::GetFlavorString ()
{
static ConstString g_flavor ("Thread::ThreadEventData");
return g_flavor;
}
Thread::ThreadEventData::ThreadEventData (const lldb::ThreadSP thread_sp) :
m_thread_sp (thread_sp),
m_stack_id ()
{
}
Thread::ThreadEventData::ThreadEventData (const lldb::ThreadSP thread_sp, const StackID &stack_id) :
m_thread_sp (thread_sp),
m_stack_id (stack_id)
{
}
Thread::ThreadEventData::ThreadEventData () :
m_thread_sp (),
m_stack_id ()
{
}
Thread::ThreadEventData::~ThreadEventData ()
{
}
void
Thread::ThreadEventData::Dump (Stream *s) const
{
}
const Thread::ThreadEventData *
Thread::ThreadEventData::GetEventDataFromEvent (const Event *event_ptr)
{
if (event_ptr)
{
const EventData *event_data = event_ptr->GetData();
if (event_data && event_data->GetFlavor() == ThreadEventData::GetFlavorString())
return static_cast <const ThreadEventData *> (event_ptr->GetData());
}
return NULL;
}
ThreadSP
Thread::ThreadEventData::GetThreadFromEvent (const Event *event_ptr)
{
ThreadSP thread_sp;
const ThreadEventData *event_data = GetEventDataFromEvent (event_ptr);
if (event_data)
thread_sp = event_data->GetThread();
return thread_sp;
}
StackID
Thread::ThreadEventData::GetStackIDFromEvent (const Event *event_ptr)
{
StackID stack_id;
const ThreadEventData *event_data = GetEventDataFromEvent (event_ptr);
if (event_data)
stack_id = event_data->GetStackID();
return stack_id;
}
StackFrameSP
Thread::ThreadEventData::GetStackFrameFromEvent (const Event *event_ptr)
{
const ThreadEventData *event_data = GetEventDataFromEvent (event_ptr);
StackFrameSP frame_sp;
if (event_data)
{
ThreadSP thread_sp = event_data->GetThread();
if (thread_sp)
{
frame_sp = thread_sp->GetStackFrameList()->GetFrameWithStackID (event_data->GetStackID());
}
}
return frame_sp;
}
//------------------------------------------------------------------
// Thread class
//------------------------------------------------------------------
ConstString &
Thread::GetStaticBroadcasterClass ()
{
static ConstString class_name ("lldb.thread");
return class_name;
}
Thread::Thread (Process &process, lldb::tid_t tid) :
ThreadProperties (false),
UserID (tid),
Broadcaster(&process.GetTarget().GetDebugger(), Thread::GetStaticBroadcasterClass().AsCString()),
m_process_wp (process.shared_from_this()),
m_stop_info_sp (),
m_stop_info_stop_id (0),
m_index_id (process.GetNextThreadIndexID(tid)),
m_reg_context_sp (),
m_state (eStateUnloaded),
m_state_mutex (Mutex::eMutexTypeRecursive),
m_plan_stack (),
m_completed_plan_stack(),
m_frame_mutex (Mutex::eMutexTypeRecursive),
m_curr_frames_sp (),
m_prev_frames_sp (),
m_resume_signal (LLDB_INVALID_SIGNAL_NUMBER),
m_resume_state (eStateRunning),
m_temporary_resume_state (eStateRunning),
m_unwinder_ap (),
m_destroy_called (false),
m_override_should_notify (eLazyBoolCalculate)
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
if (log)
log->Printf ("%p Thread::Thread(tid = 0x%4.4" PRIx64 ")", this, GetID());
CheckInWithManager();
QueueFundamentalPlan(true);
}
Thread::~Thread()
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
if (log)
log->Printf ("%p Thread::~Thread(tid = 0x%4.4" PRIx64 ")", this, GetID());
/// If you hit this assert, it means your derived class forgot to call DoDestroy in its destructor.
assert (m_destroy_called);
}
void
Thread::DestroyThread ()
{
// Tell any plans on the plan stack that the thread is being destroyed since
// any active plans that have a thread go away in the middle of might need
// to do cleanup.
for (auto plan : m_plan_stack)
plan->ThreadDestroyed();
m_destroy_called = true;
m_plan_stack.clear();
m_discarded_plan_stack.clear();
m_completed_plan_stack.clear();
// Push a ThreadPlanNull on the plan stack. That way we can continue assuming that the
// plan stack is never empty, but if somebody errantly asks questions of a destroyed thread
// without checking first whether it is destroyed, they won't crash.
ThreadPlanSP null_plan_sp(new ThreadPlanNull (*this));
m_plan_stack.push_back (null_plan_sp);
m_stop_info_sp.reset();
m_reg_context_sp.reset();
m_unwinder_ap.reset();
Mutex::Locker locker(m_frame_mutex);
m_curr_frames_sp.reset();
m_prev_frames_sp.reset();
}
void
Thread::BroadcastSelectedFrameChange(StackID &new_frame_id)
{
if (EventTypeHasListeners(eBroadcastBitSelectedFrameChanged))
BroadcastEvent(eBroadcastBitSelectedFrameChanged, new ThreadEventData (this->shared_from_this(), new_frame_id));
}
uint32_t
Thread::SetSelectedFrame (lldb_private::StackFrame *frame, bool broadcast)
{
uint32_t ret_value = GetStackFrameList()->SetSelectedFrame(frame);
if (broadcast)
BroadcastSelectedFrameChange(frame->GetStackID());
return ret_value;
}
bool
Thread::SetSelectedFrameByIndex (uint32_t frame_idx, bool broadcast)
{
StackFrameSP frame_sp(GetStackFrameList()->GetFrameAtIndex (frame_idx));
if (frame_sp)
{
GetStackFrameList()->SetSelectedFrame(frame_sp.get());
if (broadcast)
BroadcastSelectedFrameChange(frame_sp->GetStackID());
return true;
}
else
return false;
}
bool
Thread::SetSelectedFrameByIndexNoisily (uint32_t frame_idx, Stream &output_stream)
{
const bool broadcast = true;
bool success = SetSelectedFrameByIndex (frame_idx, broadcast);
if (success)
{
StackFrameSP frame_sp = GetSelectedFrame();
if (frame_sp)
{
bool already_shown = false;
SymbolContext frame_sc(frame_sp->GetSymbolContext(eSymbolContextLineEntry));
if (GetProcess()->GetTarget().GetDebugger().GetUseExternalEditor() && frame_sc.line_entry.file && frame_sc.line_entry.line != 0)
{
already_shown = Host::OpenFileInExternalEditor (frame_sc.line_entry.file, frame_sc.line_entry.line);
}
bool show_frame_info = true;
bool show_source = !already_shown;
return frame_sp->GetStatus (output_stream, show_frame_info, show_source);
}
return false;
}
else
return false;
}
lldb::StopInfoSP
Thread::GetStopInfo ()
{
if (m_destroy_called)
return m_stop_info_sp;
ThreadPlanSP plan_sp (GetCompletedPlan());
ProcessSP process_sp (GetProcess());
const uint32_t stop_id = process_sp ? process_sp->GetStopID() : UINT32_MAX;
if (plan_sp && plan_sp->PlanSucceeded())
{
return StopInfo::CreateStopReasonWithPlan (plan_sp, GetReturnValueObject());
}
else
{
if ((m_stop_info_stop_id == stop_id) || // Stop info is valid, just return what we have (even if empty)
(m_stop_info_sp && m_stop_info_sp->IsValid())) // Stop info is valid, just return what we have
{
return m_stop_info_sp;
}
else
{
GetPrivateStopInfo ();
return m_stop_info_sp;
}
}
}
lldb::StopInfoSP
Thread::GetPrivateStopInfo ()
{
if (m_destroy_called)
return m_stop_info_sp;
ProcessSP process_sp (GetProcess());
if (process_sp)
{
const uint32_t process_stop_id = process_sp->GetStopID();
if (m_stop_info_stop_id != process_stop_id)
{
if (m_stop_info_sp)
{
if (m_stop_info_sp->IsValid()
|| IsStillAtLastBreakpointHit()
|| GetCurrentPlan()->IsVirtualStep())
SetStopInfo (m_stop_info_sp);
else
m_stop_info_sp.reset();
}
if (!m_stop_info_sp)
{
if (CalculateStopInfo() == false)
SetStopInfo (StopInfoSP());
}
}
}
return m_stop_info_sp;
}
lldb::StopReason
Thread::GetStopReason()
{
lldb::StopInfoSP stop_info_sp (GetStopInfo ());
if (stop_info_sp)
return stop_info_sp->GetStopReason();
return eStopReasonNone;
}
void
Thread::SetStopInfo (const lldb::StopInfoSP &stop_info_sp)
{
m_stop_info_sp = stop_info_sp;
if (m_stop_info_sp)
{
m_stop_info_sp->MakeStopInfoValid();
// If we are overriding the ShouldReportStop, do that here:
if (m_override_should_notify != eLazyBoolCalculate)
m_stop_info_sp->OverrideShouldNotify (m_override_should_notify == eLazyBoolYes);
}
ProcessSP process_sp (GetProcess());
if (process_sp)
m_stop_info_stop_id = process_sp->GetStopID();
else
m_stop_info_stop_id = UINT32_MAX;
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_THREAD));
if (log)
log->Printf("%p: tid = 0x%" PRIx64 ": stop info = %s (stop_id = %u)\n", this, GetID(), stop_info_sp ? stop_info_sp->GetDescription() : "<NULL>", m_stop_info_stop_id);
}
void
Thread::SetShouldReportStop (Vote vote)
{
if (vote == eVoteNoOpinion)
return;
else
{
m_override_should_notify = (vote == eVoteYes ? eLazyBoolYes : eLazyBoolNo);
if (m_stop_info_sp)
m_stop_info_sp->OverrideShouldNotify (m_override_should_notify == eLazyBoolYes);
}
}
void
Thread::SetStopInfoToNothing()
{
// Note, we can't just NULL out the private reason, or the native thread implementation will try to
// go calculate it again. For now, just set it to a Unix Signal with an invalid signal number.
SetStopInfo (StopInfo::CreateStopReasonWithSignal (*this, LLDB_INVALID_SIGNAL_NUMBER));
}
bool
Thread::ThreadStoppedForAReason (void)
{
return (bool) GetPrivateStopInfo ();
}
bool
Thread::CheckpointThreadState (ThreadStateCheckpoint &saved_state)
{
if (!SaveFrameZeroState(saved_state.register_backup))
return false;
saved_state.stop_info_sp = GetStopInfo();
ProcessSP process_sp (GetProcess());
if (process_sp)
saved_state.orig_stop_id = process_sp->GetStopID();
saved_state.current_inlined_depth = GetCurrentInlinedDepth();
return true;
}
bool
Thread::RestoreRegisterStateFromCheckpoint (ThreadStateCheckpoint &saved_state)
{
RestoreSaveFrameZero(saved_state.register_backup);
return true;
}
bool
Thread::RestoreThreadStateFromCheckpoint (ThreadStateCheckpoint &saved_state)
{
if (saved_state.stop_info_sp)
saved_state.stop_info_sp->MakeStopInfoValid();
SetStopInfo(saved_state.stop_info_sp);
GetStackFrameList()->SetCurrentInlinedDepth (saved_state.current_inlined_depth);
return true;
}
StateType
Thread::GetState() const
{
// If any other threads access this we will need a mutex for it
Mutex::Locker locker(m_state_mutex);
return m_state;
}
void
Thread::SetState(StateType state)
{
Mutex::Locker locker(m_state_mutex);
m_state = state;
}
void
Thread::WillStop()
{
ThreadPlan *current_plan = GetCurrentPlan();
// FIXME: I may decide to disallow threads with no plans. In which
// case this should go to an assert.
if (!current_plan)
return;
current_plan->WillStop();
}
void
Thread::SetupForResume ()
{
if (GetResumeState() != eStateSuspended)
{
// If we're at a breakpoint push the step-over breakpoint plan. Do this before
// telling the current plan it will resume, since we might change what the current
// plan is.
// StopReason stop_reason = lldb::eStopReasonInvalid;
// StopInfoSP stop_info_sp = GetStopInfo();
// if (stop_info_sp.get())
// stop_reason = stop_info_sp->GetStopReason();
// if (stop_reason == lldb::eStopReasonBreakpoint)
lldb::RegisterContextSP reg_ctx_sp (GetRegisterContext());
if (reg_ctx_sp)
{
BreakpointSiteSP bp_site_sp = GetProcess()->GetBreakpointSiteList().FindByAddress(reg_ctx_sp->GetPC());
if (bp_site_sp)
{
// Note, don't assume there's a ThreadPlanStepOverBreakpoint, the target may not require anything
// special to step over a breakpoint.
ThreadPlan *cur_plan = GetCurrentPlan();
if (cur_plan->GetKind() != ThreadPlan::eKindStepOverBreakpoint)
{
ThreadPlanStepOverBreakpoint *step_bp_plan = new ThreadPlanStepOverBreakpoint (*this);
if (step_bp_plan)
{
ThreadPlanSP step_bp_plan_sp;
step_bp_plan->SetPrivate (true);
if (GetCurrentPlan()->RunState() != eStateStepping)
{
step_bp_plan->SetAutoContinue(true);
}
step_bp_plan_sp.reset (step_bp_plan);
QueueThreadPlan (step_bp_plan_sp, false);
}
}
}
}
}
}
bool
Thread::ShouldResume (StateType resume_state)
{
// At this point clear the completed plan stack.
m_completed_plan_stack.clear();
m_discarded_plan_stack.clear();
m_override_should_notify = eLazyBoolCalculate;
m_temporary_resume_state = resume_state;
lldb::ThreadSP backing_thread_sp (GetBackingThread ());
if (backing_thread_sp)
backing_thread_sp->m_temporary_resume_state = resume_state;
// Make sure m_stop_info_sp is valid
GetPrivateStopInfo();
// This is a little dubious, but we are trying to limit how often we actually fetch stop info from
// the target, 'cause that slows down single stepping. So assume that if we got to the point where
// we're about to resume, and we haven't yet had to fetch the stop reason, then it doesn't need to know
// about the fact that we are resuming...
const uint32_t process_stop_id = GetProcess()->GetStopID();
if (m_stop_info_stop_id == process_stop_id &&
(m_stop_info_sp && m_stop_info_sp->IsValid()))
{
StopInfo *stop_info = GetPrivateStopInfo().get();
if (stop_info)
stop_info->WillResume (resume_state);
}
// Tell all the plans that we are about to resume in case they need to clear any state.
// We distinguish between the plan on the top of the stack and the lower
// plans in case a plan needs to do any special business before it runs.
bool need_to_resume = false;
ThreadPlan *plan_ptr = GetCurrentPlan();
if (plan_ptr)
{
need_to_resume = plan_ptr->WillResume(resume_state, true);
while ((plan_ptr = GetPreviousPlan(plan_ptr)) != NULL)
{
plan_ptr->WillResume (resume_state, false);
}
// If the WillResume for the plan says we are faking a resume, then it will have set an appropriate stop info.
// In that case, don't reset it here.
if (need_to_resume && resume_state != eStateSuspended)
{
m_stop_info_sp.reset();
}
}
if (need_to_resume)
{
ClearStackFrames();
// Let Thread subclasses do any special work they need to prior to resuming
WillResume (resume_state);
}
return need_to_resume;
}
void
Thread::DidResume ()
{
SetResumeSignal (LLDB_INVALID_SIGNAL_NUMBER);
}
void
Thread::DidStop ()
{
SetState (eStateStopped);
}
bool
Thread::ShouldStop (Event* event_ptr)
{
ThreadPlan *current_plan = GetCurrentPlan();
bool should_stop = true;
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (GetResumeState () == eStateSuspended)
{
if (log)
log->Printf ("Thread::%s for tid = 0x%4.4" PRIx64 " 0x%4.4" PRIx64 ", should_stop = 0 (ignore since thread was suspended)",
__FUNCTION__,
GetID (),
GetProtocolID());
return false;
}
if (GetTemporaryResumeState () == eStateSuspended)
{
if (log)
log->Printf ("Thread::%s for tid = 0x%4.4" PRIx64 " 0x%4.4" PRIx64 ", should_stop = 0 (ignore since thread was suspended)",
__FUNCTION__,
GetID (),
GetProtocolID());
return false;
}
// Based on the current thread plan and process stop info, check if this
// thread caused the process to stop. NOTE: this must take place before
// the plan is moved from the current plan stack to the completed plan
// stack.
if (ThreadStoppedForAReason() == false)
{
if (log)
log->Printf ("Thread::%s for tid = 0x%4.4" PRIx64 " 0x%4.4" PRIx64 ", pc = 0x%16.16" PRIx64 ", should_stop = 0 (ignore since no stop reason)",
__FUNCTION__,
GetID (),
GetProtocolID(),
GetRegisterContext() ? GetRegisterContext()->GetPC() : LLDB_INVALID_ADDRESS);
return false;
}
if (log)
{
log->Printf ("Thread::%s(%p) for tid = 0x%4.4" PRIx64 " 0x%4.4" PRIx64 ", pc = 0x%16.16" PRIx64,
__FUNCTION__,
this,
GetID (),
GetProtocolID (),
GetRegisterContext() ? GetRegisterContext()->GetPC() : LLDB_INVALID_ADDRESS);
log->Printf ("^^^^^^^^ Thread::ShouldStop Begin ^^^^^^^^");
StreamString s;
s.IndentMore();
DumpThreadPlans(&s);
log->Printf ("Plan stack initial state:\n%s", s.GetData());
}
// The top most plan always gets to do the trace log...
current_plan->DoTraceLog ();
// First query the stop info's ShouldStopSynchronous. This handles "synchronous" stop reasons, for example the breakpoint
// command on internal breakpoints. If a synchronous stop reason says we should not stop, then we don't have to
// do any more work on this stop.
StopInfoSP private_stop_info (GetPrivateStopInfo());
if (private_stop_info && private_stop_info->ShouldStopSynchronous(event_ptr) == false)
{
if (log)
log->Printf ("StopInfo::ShouldStop async callback says we should not stop, returning ShouldStop of false.");
return false;
}
// If we've already been restarted, don't query the plans since the state they would examine is not current.
if (Process::ProcessEventData::GetRestartedFromEvent(event_ptr))
return false;
// Before the plans see the state of the world, calculate the current inlined depth.
GetStackFrameList()->CalculateCurrentInlinedDepth();
// If the base plan doesn't understand why we stopped, then we have to find a plan that does.
// If that plan is still working, then we don't need to do any more work. If the plan that explains
// the stop is done, then we should pop all the plans below it, and pop it, and then let the plans above it decide
// whether they still need to do more work.
bool done_processing_current_plan = false;
if (!current_plan->PlanExplainsStop(event_ptr))
{
if (current_plan->TracerExplainsStop())
{
done_processing_current_plan = true;
should_stop = false;
}
else
{
// If the current plan doesn't explain the stop, then find one that
// does and let it handle the situation.
ThreadPlan *plan_ptr = current_plan;
while ((plan_ptr = GetPreviousPlan(plan_ptr)) != NULL)
{
if (plan_ptr->PlanExplainsStop(event_ptr))
{
should_stop = plan_ptr->ShouldStop (event_ptr);
// plan_ptr explains the stop, next check whether plan_ptr is done, if so, then we should take it
// and all the plans below it off the stack.
if (plan_ptr->MischiefManaged())
{
// We're going to pop the plans up to and including the plan that explains the stop.
ThreadPlan *prev_plan_ptr = GetPreviousPlan (plan_ptr);
do
{
if (should_stop)
current_plan->WillStop();
PopPlan();
}
while ((current_plan = GetCurrentPlan()) != prev_plan_ptr);
// Now, if the responsible plan was not "Okay to discard" then we're done,
// otherwise we forward this to the next plan in the stack below.
if (plan_ptr->IsMasterPlan() && !plan_ptr->OkayToDiscard())
done_processing_current_plan = true;
else
done_processing_current_plan = false;
}
else
done_processing_current_plan = true;
break;
}
}
}
}
if (!done_processing_current_plan)
{
bool over_ride_stop = current_plan->ShouldAutoContinue(event_ptr);
if (log)
log->Printf("Plan %s explains stop, auto-continue %i.", current_plan->GetName(), over_ride_stop);
// We're starting from the base plan, so just let it decide;
if (PlanIsBasePlan(current_plan))
{
should_stop = current_plan->ShouldStop (event_ptr);
if (log)
log->Printf("Base plan says should stop: %i.", should_stop);
}
else
{
// Otherwise, don't let the base plan override what the other plans say to do, since
// presumably if there were other plans they would know what to do...
while (1)
{
if (PlanIsBasePlan(current_plan))
break;
should_stop = current_plan->ShouldStop(event_ptr);
if (log)
log->Printf("Plan %s should stop: %d.", current_plan->GetName(), should_stop);
if (current_plan->MischiefManaged())
{
if (should_stop)
current_plan->WillStop();
// If a Master Plan wants to stop, and wants to stick on the stack, we let it.
// Otherwise, see if the plan's parent wants to stop.
if (should_stop && current_plan->IsMasterPlan() && !current_plan->OkayToDiscard())
{
PopPlan();
break;
}
else
{
PopPlan();
current_plan = GetCurrentPlan();
if (current_plan == NULL)
{
break;
}
}
}
else
{
break;
}
}
}
if (over_ride_stop)
should_stop = false;
// One other potential problem is that we set up a master plan, then stop in before it is complete - for instance
// by hitting a breakpoint during a step-over - then do some step/finish/etc operations that wind up
// past the end point condition of the initial plan. We don't want to strand the original plan on the stack,
// This code clears stale plans off the stack.
if (should_stop)
{
ThreadPlan *plan_ptr = GetCurrentPlan();
while (!PlanIsBasePlan(plan_ptr))
{
bool stale = plan_ptr->IsPlanStale ();
ThreadPlan *examined_plan = plan_ptr;
plan_ptr = GetPreviousPlan (examined_plan);
if (stale)
{
if (log)
log->Printf("Plan %s being discarded in cleanup, it says it is already done.", examined_plan->GetName());
DiscardThreadPlansUpToPlan(examined_plan);
}
}
}
}
if (log)
{
StreamString s;
s.IndentMore();
DumpThreadPlans(&s);
log->Printf ("Plan stack final state:\n%s", s.GetData());
log->Printf ("vvvvvvvv Thread::ShouldStop End (returning %i) vvvvvvvv", should_stop);
}
return should_stop;
}
Vote
Thread::ShouldReportStop (Event* event_ptr)
{
StateType thread_state = GetResumeState ();
StateType temp_thread_state = GetTemporaryResumeState();
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (thread_state == eStateSuspended || thread_state == eStateInvalid)
{
if (log)
log->Printf ("Thread::ShouldReportStop() tid = 0x%4.4" PRIx64 ": returning vote %i (state was suspended or invalid)", GetID(), eVoteNoOpinion);
return eVoteNoOpinion;
}
if (temp_thread_state == eStateSuspended || temp_thread_state == eStateInvalid)
{
if (log)
log->Printf ("Thread::ShouldReportStop() tid = 0x%4.4" PRIx64 ": returning vote %i (temporary state was suspended or invalid)", GetID(), eVoteNoOpinion);
return eVoteNoOpinion;
}
if (!ThreadStoppedForAReason())
{
if (log)
log->Printf ("Thread::ShouldReportStop() tid = 0x%4.4" PRIx64 ": returning vote %i (thread didn't stop for a reason.)", GetID(), eVoteNoOpinion);
return eVoteNoOpinion;
}
if (m_completed_plan_stack.size() > 0)
{
// Don't use GetCompletedPlan here, since that suppresses private plans.
if (log)
log->Printf ("Thread::ShouldReportStop() tid = 0x%4.4" PRIx64 ": returning vote for complete stack's back plan", GetID());
return m_completed_plan_stack.back()->ShouldReportStop (event_ptr);
}
else
{
Vote thread_vote = eVoteNoOpinion;
ThreadPlan *plan_ptr = GetCurrentPlan();
while (1)
{
if (plan_ptr->PlanExplainsStop(event_ptr))
{
thread_vote = plan_ptr->ShouldReportStop(event_ptr);
break;
}
if (PlanIsBasePlan(plan_ptr))
break;
else
plan_ptr = GetPreviousPlan(plan_ptr);
}
if (log)
log->Printf ("Thread::ShouldReportStop() tid = 0x%4.4" PRIx64 ": returning vote %i for current plan", GetID(), thread_vote);
return thread_vote;
}
}
Vote
Thread::ShouldReportRun (Event* event_ptr)
{
StateType thread_state = GetResumeState ();
if (thread_state == eStateSuspended
|| thread_state == eStateInvalid)
{
return eVoteNoOpinion;
}
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (m_completed_plan_stack.size() > 0)
{
// Don't use GetCompletedPlan here, since that suppresses private plans.
if (log)
log->Printf ("Current Plan for thread %d(%p) (0x%4.4" PRIx64 ", %s): %s being asked whether we should report run.",
GetIndexID(),
this,
GetID(),
StateAsCString(GetTemporaryResumeState()),
m_completed_plan_stack.back()->GetName());
return m_completed_plan_stack.back()->ShouldReportRun (event_ptr);
}
else
{
if (log)
log->Printf ("Current Plan for thread %d(%p) (0x%4.4" PRIx64 ", %s): %s being asked whether we should report run.",
GetIndexID(),
this,
GetID(),
StateAsCString(GetTemporaryResumeState()),
GetCurrentPlan()->GetName());
return GetCurrentPlan()->ShouldReportRun (event_ptr);
}
}
bool
Thread::MatchesSpec (const ThreadSpec *spec)
{
if (spec == NULL)
return true;
return spec->ThreadPassesBasicTests(*this);
}
void
Thread::PushPlan (ThreadPlanSP &thread_plan_sp)
{
if (thread_plan_sp)
{
// If the thread plan doesn't already have a tracer, give it its parent's tracer:
if (!thread_plan_sp->GetThreadPlanTracer())
thread_plan_sp->SetThreadPlanTracer(m_plan_stack.back()->GetThreadPlanTracer());
m_plan_stack.push_back (thread_plan_sp);
thread_plan_sp->DidPush();
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (log)
{
StreamString s;
thread_plan_sp->GetDescription (&s, lldb::eDescriptionLevelFull);
log->Printf("Thread::PushPlan(0x%p): \"%s\", tid = 0x%4.4" PRIx64 ".",
this,
s.GetData(),
thread_plan_sp->GetThread().GetID());
}
}
}
void
Thread::PopPlan ()
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (m_plan_stack.size() <= 1)
return;
else
{
ThreadPlanSP &plan = m_plan_stack.back();
if (log)
{
log->Printf("Popping plan: \"%s\", tid = 0x%4.4" PRIx64 ".", plan->GetName(), plan->GetThread().GetID());
}
m_completed_plan_stack.push_back (plan);
plan->WillPop();
m_plan_stack.pop_back();
}
}
void
Thread::DiscardPlan ()
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (m_plan_stack.size() > 1)
{
ThreadPlanSP &plan = m_plan_stack.back();
if (log)
log->Printf("Discarding plan: \"%s\", tid = 0x%4.4" PRIx64 ".", plan->GetName(), plan->GetThread().GetID());
m_discarded_plan_stack.push_back (plan);
plan->WillPop();
m_plan_stack.pop_back();
}
}
ThreadPlan *
Thread::GetCurrentPlan ()
{
// There will always be at least the base plan. If somebody is mucking with a
// thread with an empty plan stack, we should assert right away.
if (m_plan_stack.empty())
return NULL;
return m_plan_stack.back().get();
}
ThreadPlanSP
Thread::GetCompletedPlan ()
{
ThreadPlanSP empty_plan_sp;
if (!m_completed_plan_stack.empty())
{
for (int i = m_completed_plan_stack.size() - 1; i >= 0; i--)
{
ThreadPlanSP completed_plan_sp;
completed_plan_sp = m_completed_plan_stack[i];
if (!completed_plan_sp->GetPrivate ())
return completed_plan_sp;
}
}
return empty_plan_sp;
}
ValueObjectSP
Thread::GetReturnValueObject ()
{
if (!m_completed_plan_stack.empty())
{
for (int i = m_completed_plan_stack.size() - 1; i >= 0; i--)
{
ValueObjectSP return_valobj_sp;
return_valobj_sp = m_completed_plan_stack[i]->GetReturnValueObject();
if (return_valobj_sp)
return return_valobj_sp;
}
}
return ValueObjectSP();
}
bool
Thread::IsThreadPlanDone (ThreadPlan *plan)
{
if (!m_completed_plan_stack.empty())
{
for (int i = m_completed_plan_stack.size() - 1; i >= 0; i--)
{
if (m_completed_plan_stack[i].get() == plan)
return true;
}
}
return false;
}
bool
Thread::WasThreadPlanDiscarded (ThreadPlan *plan)
{
if (!m_discarded_plan_stack.empty())
{
for (int i = m_discarded_plan_stack.size() - 1; i >= 0; i--)
{
if (m_discarded_plan_stack[i].get() == plan)
return true;
}
}
return false;
}
ThreadPlan *
Thread::GetPreviousPlan (ThreadPlan *current_plan)
{
if (current_plan == NULL)
return NULL;
int stack_size = m_completed_plan_stack.size();
for (int i = stack_size - 1; i > 0; i--)
{
if (current_plan == m_completed_plan_stack[i].get())
return m_completed_plan_stack[i-1].get();
}
if (stack_size > 0 && m_completed_plan_stack[0].get() == current_plan)
{
if (m_plan_stack.size() > 0)
return m_plan_stack.back().get();
else
return NULL;
}
stack_size = m_plan_stack.size();
for (int i = stack_size - 1; i > 0; i--)
{
if (current_plan == m_plan_stack[i].get())
return m_plan_stack[i-1].get();
}
return NULL;
}
void
Thread::QueueThreadPlan (ThreadPlanSP &thread_plan_sp, bool abort_other_plans)
{
if (abort_other_plans)
DiscardThreadPlans(true);
PushPlan (thread_plan_sp);
}
void
Thread::EnableTracer (bool value, bool single_stepping)
{
int stack_size = m_plan_stack.size();
for (int i = 0; i < stack_size; i++)
{
if (m_plan_stack[i]->GetThreadPlanTracer())
{
m_plan_stack[i]->GetThreadPlanTracer()->EnableTracing(value);
m_plan_stack[i]->GetThreadPlanTracer()->EnableSingleStep(single_stepping);
}
}
}
void
Thread::SetTracer (lldb::ThreadPlanTracerSP &tracer_sp)
{
int stack_size = m_plan_stack.size();
for (int i = 0; i < stack_size; i++)
m_plan_stack[i]->SetThreadPlanTracer(tracer_sp);
}
void
Thread::DiscardThreadPlansUpToPlan (lldb::ThreadPlanSP &up_to_plan_sp)
{
DiscardThreadPlansUpToPlan (up_to_plan_sp.get());
}
void
Thread::DiscardThreadPlansUpToPlan (ThreadPlan *up_to_plan_ptr)
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (log)
{
log->Printf("Discarding thread plans for thread tid = 0x%4.4" PRIx64 ", up to %p", GetID(), up_to_plan_ptr);
}
int stack_size = m_plan_stack.size();
// If the input plan is NULL, discard all plans. Otherwise make sure this plan is in the
// stack, and if so discard up to and including it.
if (up_to_plan_ptr == NULL)
{
for (int i = stack_size - 1; i > 0; i--)
DiscardPlan();
}
else
{
bool found_it = false;
for (int i = stack_size - 1; i > 0; i--)
{
if (m_plan_stack[i].get() == up_to_plan_ptr)
found_it = true;
}
if (found_it)
{
bool last_one = false;
for (int i = stack_size - 1; i > 0 && !last_one ; i--)
{
if (GetCurrentPlan() == up_to_plan_ptr)
last_one = true;
DiscardPlan();
}
}
}
return;
}
void
Thread::DiscardThreadPlans(bool force)
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (log)
{
log->Printf("Discarding thread plans for thread (tid = 0x%4.4" PRIx64 ", force %d)", GetID(), force);
}
if (force)
{
int stack_size = m_plan_stack.size();
for (int i = stack_size - 1; i > 0; i--)
{
DiscardPlan();
}
return;
}
while (1)
{
int master_plan_idx;
bool discard = true;
// Find the first master plan, see if it wants discarding, and if yes discard up to it.
for (master_plan_idx = m_plan_stack.size() - 1; master_plan_idx >= 0; master_plan_idx--)
{
if (m_plan_stack[master_plan_idx]->IsMasterPlan())
{
discard = m_plan_stack[master_plan_idx]->OkayToDiscard();
break;
}
}
if (discard)
{
// First pop all the dependent plans:
for (int i = m_plan_stack.size() - 1; i > master_plan_idx; i--)
{
// FIXME: Do we need a finalize here, or is the rule that "PrepareForStop"
// for the plan leaves it in a state that it is safe to pop the plan
// with no more notice?
DiscardPlan();
}
// Now discard the master plan itself.
// The bottom-most plan never gets discarded. "OkayToDiscard" for it means
// discard it's dependent plans, but not it...
if (master_plan_idx > 0)
{
DiscardPlan();
}
}
else
{
// If the master plan doesn't want to get discarded, then we're done.
break;
}
}
}
bool
Thread::PlanIsBasePlan (ThreadPlan *plan_ptr)
{
if (plan_ptr->IsBasePlan())
return true;
else if (m_plan_stack.size() == 0)
return false;
else
return m_plan_stack[0].get() == plan_ptr;
}
Error
Thread::UnwindInnermostExpression()
{
Error error;
int stack_size = m_plan_stack.size();
// If the input plan is NULL, discard all plans. Otherwise make sure this plan is in the
// stack, and if so discard up to and including it.
for (int i = stack_size - 1; i > 0; i--)
{
if (m_plan_stack[i]->GetKind() == ThreadPlan::eKindCallFunction)
{
DiscardThreadPlansUpToPlan(m_plan_stack[i].get());
return error;
}
}
error.SetErrorString("No expressions currently active on this thread");
return error;
}
ThreadPlanSP
Thread::QueueFundamentalPlan (bool abort_other_plans)
{
ThreadPlanSP thread_plan_sp (new ThreadPlanBase(*this));
QueueThreadPlan (thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
ThreadPlanSP
Thread::QueueThreadPlanForStepSingleInstruction
(
bool step_over,
bool abort_other_plans,
bool stop_other_threads
)
{
ThreadPlanSP thread_plan_sp (new ThreadPlanStepInstruction (*this, step_over, stop_other_threads, eVoteNoOpinion, eVoteNoOpinion));
QueueThreadPlan (thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
ThreadPlanSP
Thread::QueueThreadPlanForStepOverRange
(
bool abort_other_plans,
const AddressRange &range,
const SymbolContext &addr_context,
lldb::RunMode stop_other_threads
)
{
ThreadPlanSP thread_plan_sp;
thread_plan_sp.reset (new ThreadPlanStepOverRange (*this, range, addr_context, stop_other_threads));
QueueThreadPlan (thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
ThreadPlanSP
Thread::QueueThreadPlanForStepInRange
(
bool abort_other_plans,
const AddressRange &range,
const SymbolContext &addr_context,
const char *step_in_target,
lldb::RunMode stop_other_threads,
bool avoid_code_without_debug_info
)
{
ThreadPlanSP thread_plan_sp;
ThreadPlanStepInRange *plan = new ThreadPlanStepInRange (*this, range, addr_context, stop_other_threads);
if (avoid_code_without_debug_info)
plan->GetFlags().Set (ThreadPlanShouldStopHere::eAvoidNoDebug);
else
plan->GetFlags().Clear (ThreadPlanShouldStopHere::eAvoidNoDebug);
if (step_in_target)
plan->SetStepInTarget(step_in_target);
thread_plan_sp.reset (plan);
QueueThreadPlan (thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
ThreadPlanSP
Thread::QueueThreadPlanForStepOverBreakpointPlan (bool abort_other_plans)
{
ThreadPlanSP thread_plan_sp (new ThreadPlanStepOverBreakpoint (*this));
QueueThreadPlan (thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
ThreadPlanSP
Thread::QueueThreadPlanForStepOut
(
bool abort_other_plans,
SymbolContext *addr_context,
bool first_insn,
bool stop_other_threads,
Vote stop_vote,
Vote run_vote,
uint32_t frame_idx
)
{
ThreadPlanSP thread_plan_sp (new ThreadPlanStepOut (*this,
addr_context,
first_insn,
stop_other_threads,
stop_vote,
run_vote,
frame_idx));
if (thread_plan_sp->ValidatePlan(NULL))
{
QueueThreadPlan (thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
else
{
return ThreadPlanSP();
}
}
ThreadPlanSP
Thread::QueueThreadPlanForStepThrough (StackID &return_stack_id, bool abort_other_plans, bool stop_other_threads)
{
ThreadPlanSP thread_plan_sp(new ThreadPlanStepThrough (*this, return_stack_id, stop_other_threads));
if (!thread_plan_sp || !thread_plan_sp->ValidatePlan (NULL))
return ThreadPlanSP();
QueueThreadPlan (thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
ThreadPlanSP
Thread::QueueThreadPlanForCallFunction (bool abort_other_plans,
Address& function,
lldb::addr_t arg,
bool stop_other_threads,
bool unwind_on_error,
bool ignore_breakpoints)
{
ThreadPlanSP thread_plan_sp (new ThreadPlanCallFunction (*this,
function,
ClangASTType(),
arg,
stop_other_threads,
unwind_on_error,
ignore_breakpoints));
QueueThreadPlan (thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
ThreadPlanSP
Thread::QueueThreadPlanForRunToAddress (bool abort_other_plans,
Address &target_addr,
bool stop_other_threads)
{
ThreadPlanSP thread_plan_sp (new ThreadPlanRunToAddress (*this, target_addr, stop_other_threads));
QueueThreadPlan (thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
ThreadPlanSP
Thread::QueueThreadPlanForStepUntil (bool abort_other_plans,
lldb::addr_t *address_list,
size_t num_addresses,
bool stop_other_threads,
uint32_t frame_idx)
{
ThreadPlanSP thread_plan_sp (new ThreadPlanStepUntil (*this, address_list, num_addresses, stop_other_threads, frame_idx));
QueueThreadPlan (thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
uint32_t
Thread::GetIndexID () const
{
return m_index_id;
}
void
Thread::DumpThreadPlans (lldb_private::Stream *s) const
{
uint32_t stack_size = m_plan_stack.size();
int i;
s->Indent();
s->Printf ("Plan Stack for thread #%u: tid = 0x%4.4" PRIx64 ", stack_size = %d\n", GetIndexID(), GetID(), stack_size);
for (i = stack_size - 1; i >= 0; i--)
{
s->IndentMore();
s->Indent();
s->Printf ("Element %d: ", i);
m_plan_stack[i]->GetDescription (s, eDescriptionLevelFull);
s->EOL();
s->IndentLess();
}
stack_size = m_completed_plan_stack.size();
if (stack_size > 0)
{
s->Indent();
s->Printf ("Completed Plan Stack: %d elements.\n", stack_size);
for (i = stack_size - 1; i >= 0; i--)
{
s->IndentMore();
s->Indent();
s->Printf ("Element %d: ", i);
m_completed_plan_stack[i]->GetDescription (s, eDescriptionLevelFull);
s->EOL();
s->IndentLess();
}
}
stack_size = m_discarded_plan_stack.size();
if (stack_size > 0)
{
s->Indent();
s->Printf ("Discarded Plan Stack: %d elements.\n", stack_size);
for (i = stack_size - 1; i >= 0; i--)
{
s->IndentMore();
s->Indent();
s->Printf ("Element %d: ", i);
m_discarded_plan_stack[i]->GetDescription (s, eDescriptionLevelFull);
s->EOL();
s->IndentLess();
}
}
}
TargetSP
Thread::CalculateTarget ()
{
TargetSP target_sp;
ProcessSP process_sp(GetProcess());
if (process_sp)
target_sp = process_sp->CalculateTarget();
return target_sp;
}
ProcessSP
Thread::CalculateProcess ()
{
return GetProcess();
}
ThreadSP
Thread::CalculateThread ()
{
return shared_from_this();
}
StackFrameSP
Thread::CalculateStackFrame ()
{
return StackFrameSP();
}
void
Thread::CalculateExecutionContext (ExecutionContext &exe_ctx)
{
exe_ctx.SetContext (shared_from_this());
}
StackFrameListSP
Thread::GetStackFrameList ()
{
StackFrameListSP frame_list_sp;
Mutex::Locker locker(m_frame_mutex);
if (m_curr_frames_sp)
{
frame_list_sp = m_curr_frames_sp;
}
else
{
frame_list_sp.reset(new StackFrameList (*this, m_prev_frames_sp, true));
m_curr_frames_sp = frame_list_sp;
}
return frame_list_sp;
}
void
Thread::ClearStackFrames ()
{
Mutex::Locker locker(m_frame_mutex);
Unwind *unwinder = GetUnwinder ();
if (unwinder)
unwinder->Clear();
// Only store away the old "reference" StackFrameList if we got all its frames:
// FIXME: At some point we can try to splice in the frames we have fetched into
// the new frame as we make it, but let's not try that now.
if (m_curr_frames_sp && m_curr_frames_sp->GetAllFramesFetched())
m_prev_frames_sp.swap (m_curr_frames_sp);
m_curr_frames_sp.reset();
}
lldb::StackFrameSP
Thread::GetFrameWithConcreteFrameIndex (uint32_t unwind_idx)
{
return GetStackFrameList()->GetFrameWithConcreteFrameIndex (unwind_idx);
}
Error
Thread::ReturnFromFrameWithIndex (uint32_t frame_idx, lldb::ValueObjectSP return_value_sp, bool broadcast)
{
StackFrameSP frame_sp = GetStackFrameAtIndex (frame_idx);
Error return_error;
if (!frame_sp)
{
return_error.SetErrorStringWithFormat("Could not find frame with index %d in thread 0x%" PRIx64 ".", frame_idx, GetID());
}
return ReturnFromFrame(frame_sp, return_value_sp, broadcast);
}
Error
Thread::ReturnFromFrame (lldb::StackFrameSP frame_sp, lldb::ValueObjectSP return_value_sp, bool broadcast)
{
Error return_error;
if (!frame_sp)
{
return_error.SetErrorString("Can't return to a null frame.");
return return_error;
}
Thread *thread = frame_sp->GetThread().get();
uint32_t older_frame_idx = frame_sp->GetFrameIndex() + 1;
StackFrameSP older_frame_sp = thread->GetStackFrameAtIndex(older_frame_idx);
if (!older_frame_sp)
{
return_error.SetErrorString("No older frame to return to.");
return return_error;
}
if (return_value_sp)
{
lldb::ABISP abi = thread->GetProcess()->GetABI();
if (!abi)
{
return_error.SetErrorString("Could not find ABI to set return value.");
return return_error;
}
SymbolContext sc = frame_sp->GetSymbolContext(eSymbolContextFunction);
// FIXME: ValueObject::Cast doesn't currently work correctly, at least not for scalars.
// Turn that back on when that works.
if (0 && sc.function != NULL)
{
Type *function_type = sc.function->GetType();
if (function_type)
{
ClangASTType return_type = sc.function->GetClangType().GetFunctionReturnType();
if (return_type)
{
StreamString s;
return_type.DumpTypeDescription(&s);
ValueObjectSP cast_value_sp = return_value_sp->Cast(return_type);
if (cast_value_sp)
{
cast_value_sp->SetFormat(eFormatHex);
return_value_sp = cast_value_sp;
}
}
}
}
return_error = abi->SetReturnValueObject(older_frame_sp, return_value_sp);
if (!return_error.Success())
return return_error;
}
// Now write the return registers for the chosen frame:
// Note, we can't use ReadAllRegisterValues->WriteAllRegisterValues, since the read & write
// cook their data
StackFrameSP youngest_frame_sp = thread->GetStackFrameAtIndex(0);
if (youngest_frame_sp)
{
lldb::RegisterContextSP reg_ctx_sp (youngest_frame_sp->GetRegisterContext());
if (reg_ctx_sp)
{
bool copy_success = reg_ctx_sp->CopyFromRegisterContext(older_frame_sp->GetRegisterContext());
if (copy_success)
{
thread->DiscardThreadPlans(true);
thread->ClearStackFrames();
if (broadcast && EventTypeHasListeners(eBroadcastBitStackChanged))
BroadcastEvent(eBroadcastBitStackChanged, new ThreadEventData (this->shared_from_this()));
}
else
{
return_error.SetErrorString("Could not reset register values.");
}
}
else
{
return_error.SetErrorString("Frame has no register context.");
}
}
else
{
return_error.SetErrorString("Returned past top frame.");
}
return return_error;
}
static void DumpAddressList (Stream &s, const std::vector<Address> &list, ExecutionContextScope *exe_scope)
{
for (size_t n=0;n<list.size();n++)
{
s << "\t";
list[n].Dump (&s, exe_scope, Address::DumpStyleResolvedDescription, Address::DumpStyleSectionNameOffset);
s << "\n";
}
}
Error
Thread::JumpToLine (const FileSpec &file, uint32_t line, bool can_leave_function, std::string *warnings)
{
ExecutionContext exe_ctx (GetStackFrameAtIndex(0));
Target *target = exe_ctx.GetTargetPtr();
TargetSP target_sp = exe_ctx.GetTargetSP();
RegisterContext *reg_ctx = exe_ctx.GetRegisterContext();
StackFrame *frame = exe_ctx.GetFramePtr();
const SymbolContext &sc = frame->GetSymbolContext(eSymbolContextFunction);
// Find candidate locations.
std::vector<Address> candidates, within_function, outside_function;
target->GetImages().FindAddressesForLine (target_sp, file, line, sc.function, within_function, outside_function);
// If possible, we try and stay within the current function.
// Within a function, we accept multiple locations (optimized code may do this,
// there's no solution here so we do the best we can).
// However if we're trying to leave the function, we don't know how to pick the
// right location, so if there's more than one then we bail.
if (!within_function.empty())
candidates = within_function;
else if (outside_function.size() == 1 && can_leave_function)
candidates = outside_function;
// Check if we got anything.
if (candidates.empty())
{
if (outside_function.empty())
{
return Error("Cannot locate an address for %s:%i.",
file.GetFilename().AsCString(), line);
}
else if (outside_function.size() == 1)
{
return Error("%s:%i is outside the current function.",
file.GetFilename().AsCString(), line);
}
else
{
StreamString sstr;
DumpAddressList(sstr, outside_function, target);
return Error("%s:%i has multiple candidate locations:\n%s",
file.GetFilename().AsCString(), line, sstr.GetString().c_str());
}
}
// Accept the first location, warn about any others.
Address dest = candidates[0];
if (warnings && candidates.size() > 1)
{
StreamString sstr;
sstr.Printf("%s:%i appears multiple times in this function, selecting the first location:\n",
file.GetFilename().AsCString(), line);
DumpAddressList(sstr, candidates, target);
*warnings = sstr.GetString();
}
if (!reg_ctx->SetPC (dest))
return Error("Cannot change PC to target address.");
return Error();
}
void
Thread::DumpUsingSettingsFormat (Stream &strm, uint32_t frame_idx)
{
ExecutionContext exe_ctx (shared_from_this());
Process *process = exe_ctx.GetProcessPtr();
if (process == NULL)
return;
StackFrameSP frame_sp;
SymbolContext frame_sc;
if (frame_idx != LLDB_INVALID_INDEX32)
{
frame_sp = GetStackFrameAtIndex (frame_idx);
if (frame_sp)
{
exe_ctx.SetFrameSP(frame_sp);
frame_sc = frame_sp->GetSymbolContext(eSymbolContextEverything);
}
}
const char *thread_format = exe_ctx.GetTargetRef().GetDebugger().GetThreadFormat();
assert (thread_format);
Debugger::FormatPrompt (thread_format,
frame_sp ? &frame_sc : NULL,
&exe_ctx,
NULL,
strm);
}
void
Thread::SettingsInitialize ()
{
}
void
Thread::SettingsTerminate ()
{
}
lldb::StackFrameSP
Thread::GetStackFrameSPForStackFramePtr (StackFrame *stack_frame_ptr)
{
return GetStackFrameList()->GetStackFrameSPForStackFramePtr (stack_frame_ptr);
}
const char *
Thread::StopReasonAsCString (lldb::StopReason reason)
{
switch (reason)
{
case eStopReasonInvalid: return "invalid";
case eStopReasonNone: return "none";
case eStopReasonTrace: return "trace";
case eStopReasonBreakpoint: return "breakpoint";
case eStopReasonWatchpoint: return "watchpoint";
case eStopReasonSignal: return "signal";
case eStopReasonException: return "exception";
case eStopReasonExec: return "exec";
case eStopReasonPlanComplete: return "plan complete";
case eStopReasonThreadExiting: return "thread exiting";
}
static char unknown_state_string[64];
snprintf(unknown_state_string, sizeof (unknown_state_string), "StopReason = %i", reason);
return unknown_state_string;
}
const char *
Thread::RunModeAsCString (lldb::RunMode mode)
{
switch (mode)
{
case eOnlyThisThread: return "only this thread";
case eAllThreads: return "all threads";
case eOnlyDuringStepping: return "only during stepping";
}
static char unknown_state_string[64];
snprintf(unknown_state_string, sizeof (unknown_state_string), "RunMode = %i", mode);
return unknown_state_string;
}
size_t
Thread::GetStatus (Stream &strm, uint32_t start_frame, uint32_t num_frames, uint32_t num_frames_with_source)
{
ExecutionContext exe_ctx (shared_from_this());
Target *target = exe_ctx.GetTargetPtr();
Process *process = exe_ctx.GetProcessPtr();
size_t num_frames_shown = 0;
strm.Indent();
bool is_selected = false;
if (process)
{
if (process->GetThreadList().GetSelectedThread().get() == this)
is_selected = true;
}
strm.Printf("%c ", is_selected ? '*' : ' ');
if (target && target->GetDebugger().GetUseExternalEditor())
{
StackFrameSP frame_sp = GetStackFrameAtIndex(start_frame);
if (frame_sp)
{
SymbolContext frame_sc(frame_sp->GetSymbolContext (eSymbolContextLineEntry));
if (frame_sc.line_entry.line != 0 && frame_sc.line_entry.file)
{
Host::OpenFileInExternalEditor (frame_sc.line_entry.file, frame_sc.line_entry.line);
}
}
}
DumpUsingSettingsFormat (strm, start_frame);
if (num_frames > 0)
{
strm.IndentMore();
const bool show_frame_info = true;
strm.IndentMore ();
num_frames_shown = GetStackFrameList ()->GetStatus (strm,
start_frame,
num_frames,
show_frame_info,
num_frames_with_source);
strm.IndentLess();
strm.IndentLess();
}
return num_frames_shown;
}
size_t
Thread::GetStackFrameStatus (Stream& strm,
uint32_t first_frame,
uint32_t num_frames,
bool show_frame_info,
uint32_t num_frames_with_source)
{
return GetStackFrameList()->GetStatus (strm,
first_frame,
num_frames,
show_frame_info,
num_frames_with_source);
}
bool
Thread::SaveFrameZeroState (RegisterCheckpoint &checkpoint)
{
lldb::StackFrameSP frame_sp(GetStackFrameAtIndex (0));
if (frame_sp)
{
checkpoint.SetStackID(frame_sp->GetStackID());
lldb::RegisterContextSP reg_ctx_sp (frame_sp->GetRegisterContext());
if (reg_ctx_sp)
return reg_ctx_sp->ReadAllRegisterValues (checkpoint.GetData());
}
return false;
}
bool
Thread::RestoreSaveFrameZero (const RegisterCheckpoint &checkpoint)
{
return ResetFrameZeroRegisters (checkpoint.GetData());
}
bool
Thread::ResetFrameZeroRegisters (lldb::DataBufferSP register_data_sp)
{
lldb::StackFrameSP frame_sp(GetStackFrameAtIndex (0));
if (frame_sp)
{
lldb::RegisterContextSP reg_ctx_sp (frame_sp->GetRegisterContext());
if (reg_ctx_sp)
{
bool ret = reg_ctx_sp->WriteAllRegisterValues (register_data_sp);
// Clear out all stack frames as our world just changed.
ClearStackFrames();
reg_ctx_sp->InvalidateIfNeeded(true);
if (m_unwinder_ap.get())
m_unwinder_ap->Clear();
return ret;
}
}
return false;
}
Unwind *
Thread::GetUnwinder ()
{
if (m_unwinder_ap.get() == NULL)
{
const ArchSpec target_arch (CalculateTarget()->GetArchitecture ());
const llvm::Triple::ArchType machine = target_arch.GetMachine();
switch (machine)
{
case llvm::Triple::x86_64:
case llvm::Triple::x86:
case llvm::Triple::arm:
case llvm::Triple::thumb:
m_unwinder_ap.reset (new UnwindLLDB (*this));
break;
default:
if (target_arch.GetTriple().getVendor() == llvm::Triple::Apple)
m_unwinder_ap.reset (new UnwindMacOSXFrameBackchain (*this));
break;
}
}
return m_unwinder_ap.get();
}
void
Thread::Flush ()
{
ClearStackFrames ();
m_reg_context_sp.reset();
}
bool
Thread::IsStillAtLastBreakpointHit ()
{
// If we are currently stopped at a breakpoint, always return that stopinfo and don't reset it.
// This allows threads to maintain their breakpoint stopinfo, such as when thread-stepping in
// multithreaded programs.
if (m_stop_info_sp) {
StopReason stop_reason = m_stop_info_sp->GetStopReason();
if (stop_reason == lldb::eStopReasonBreakpoint) {
uint64_t value = m_stop_info_sp->GetValue();
lldb::RegisterContextSP reg_ctx_sp (GetRegisterContext());
if (reg_ctx_sp)
{
lldb::addr_t pc = reg_ctx_sp->GetPC();
BreakpointSiteSP bp_site_sp = GetProcess()->GetBreakpointSiteList().FindByAddress(pc);
if (bp_site_sp && value == bp_site_sp->GetID())
return true;
}
}
}
return false;
}
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