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

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//===-- Thread.cpp --------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Target/Thread.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/FormatEntity.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/StructuredDataImpl.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Host/Host.h"
#include "lldb/Interpreter/OptionValueFileSpecList.h"
#include "lldb/Interpreter/OptionValueProperties.h"
#include "lldb/Interpreter/Property.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Target/ABI.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/LanguageRuntime.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StackFrameRecognizer.h"
#include "lldb/Target/StopInfo.h"
#include "lldb/Target/SystemRuntime.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/ThreadPlan.h"
#include "lldb/Target/ThreadPlanBase.h"
#include "lldb/Target/ThreadPlanCallFunction.h"
#include "lldb/Target/ThreadPlanPython.h"
#include "lldb/Target/ThreadPlanRunToAddress.h"
#include "lldb/Target/ThreadPlanStack.h"
#include "lldb/Target/ThreadPlanStepInRange.h"
#include "lldb/Target/ThreadPlanStepInstruction.h"
#include "lldb/Target/ThreadPlanStepOut.h"
#include "lldb/Target/ThreadPlanStepOverBreakpoint.h"
#include "lldb/Target/ThreadPlanStepOverRange.h"
#include "lldb/Target/ThreadPlanStepThrough.h"
#include "lldb/Target/ThreadPlanStepUntil.h"
#include "lldb/Target/ThreadSpec.h"
#include "lldb/Target/UnwindLLDB.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/RegularExpression.h"
#include "lldb/Utility/State.h"
#include "lldb/Utility/Stream.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/lldb-enumerations.h"
#include <memory>
using namespace lldb;
using namespace lldb_private;
const ThreadPropertiesSP &Thread::GetGlobalProperties() {
// NOTE: intentional leak so we don't crash if global destructor chain gets
// called as other threads still use the result of this function
static ThreadPropertiesSP *g_settings_sp_ptr =
new ThreadPropertiesSP(new ThreadProperties(true));
return *g_settings_sp_ptr;
}
#define LLDB_PROPERTIES_thread
#include "TargetProperties.inc"
enum {
#define LLDB_PROPERTIES_thread
#include "TargetPropertiesEnum.inc"
};
class ThreadOptionValueProperties
: public Cloneable<ThreadOptionValueProperties, OptionValueProperties> {
public:
ThreadOptionValueProperties(ConstString name) : Cloneable(name) {}
const Property *GetPropertyAtIndex(const ExecutionContext *exe_ctx,
bool will_modify,
uint32_t idx) const override {
// When getting 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 =
std::make_shared<ThreadOptionValueProperties>(ConstString("thread"));
m_collection_sp->Initialize(g_thread_properties);
} else
m_collection_sp =
OptionValueProperties::CreateLocalCopy(*Thread::GetGlobalProperties());
}
ThreadProperties::~ThreadProperties() = default;
const RegularExpression *ThreadProperties::GetSymbolsToAvoidRegexp() {
const uint32_t idx = ePropertyStepAvoidRegex;
return m_collection_sp->GetPropertyAtIndexAsOptionValueRegex(nullptr, idx);
}
FileSpecList ThreadProperties::GetLibrariesToAvoid() const {
const uint32_t idx = ePropertyStepAvoidLibraries;
const OptionValueFileSpecList *option_value =
m_collection_sp->GetPropertyAtIndexAsOptionValueFileSpecList(nullptr,
false, idx);
assert(option_value);
return option_value->GetCurrentValue();
}
bool ThreadProperties::GetTraceEnabledState() const {
const uint32_t idx = ePropertyEnableThreadTrace;
return m_collection_sp->GetPropertyAtIndexAsBoolean(
nullptr, idx, g_thread_properties[idx].default_uint_value != 0);
}
bool ThreadProperties::GetStepInAvoidsNoDebug() const {
const uint32_t idx = ePropertyStepInAvoidsNoDebug;
return m_collection_sp->GetPropertyAtIndexAsBoolean(
nullptr, idx, g_thread_properties[idx].default_uint_value != 0);
}
bool ThreadProperties::GetStepOutAvoidsNoDebug() const {
const uint32_t idx = ePropertyStepOutAvoidsNoDebug;
return m_collection_sp->GetPropertyAtIndexAsBoolean(
nullptr, idx, g_thread_properties[idx].default_uint_value != 0);
}
uint64_t ThreadProperties::GetMaxBacktraceDepth() const {
const uint32_t idx = ePropertyMaxBacktraceDepth;
return m_collection_sp->GetPropertyAtIndexAsUInt64(
nullptr, idx, g_thread_properties[idx].default_uint_value != 0);
}
// Thread Event Data
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() = default;
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 nullptr;
}
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, bool use_invalid_index_id)
: ThreadProperties(false), UserID(tid),
Broadcaster(process.GetTarget().GetDebugger().GetBroadcasterManager(),
Thread::GetStaticBroadcasterClass().AsCString()),
m_process_wp(process.shared_from_this()), m_stop_info_sp(),
m_stop_info_stop_id(0), m_stop_info_override_stop_id(0),
m_index_id(use_invalid_index_id ? LLDB_INVALID_INDEX32
: process.GetNextThreadIndexID(tid)),
m_reg_context_sp(), m_state(eStateUnloaded), m_state_mutex(),
m_frame_mutex(), 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_up(), m_destroy_called(false),
m_override_should_notify(eLazyBoolCalculate),
m_extended_info_fetched(false), m_extended_info() {
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
LLDB_LOGF(log, "%p Thread::Thread(tid = 0x%4.4" PRIx64 ")",
static_cast<void *>(this), GetID());
CheckInWithManager();
}
Thread::~Thread() {
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
LLDB_LOGF(log, "%p Thread::~Thread(tid = 0x%4.4" PRIx64 ")",
static_cast<void *>(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() {
m_destroy_called = true;
m_stop_info_sp.reset();
m_reg_context_sp.reset();
m_unwinder_up.reset();
std::lock_guard<std::recursive_mutex> guard(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));
}
lldb::StackFrameSP Thread::GetSelectedFrame() {
StackFrameListSP stack_frame_list_sp(GetStackFrameList());
StackFrameSP frame_sp = stack_frame_list_sp->GetFrameAtIndex(
stack_frame_list_sp->GetSelectedFrameIndex());
FrameSelectedCallback(frame_sp.get());
return frame_sp;
}
uint32_t Thread::SetSelectedFrame(lldb_private::StackFrame *frame,
bool broadcast) {
uint32_t ret_value = GetStackFrameList()->SetSelectedFrame(frame);
if (broadcast)
BroadcastSelectedFrameChange(frame->GetStackID());
FrameSelectedCallback(frame);
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());
FrameSelectedCallback(frame_sp.get());
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;
FrameSelectedCallback(frame_sp.get());
return frame_sp->GetStatus(output_stream, show_frame_info, show_source);
}
return false;
} else
return false;
}
void Thread::FrameSelectedCallback(StackFrame *frame) {
if (!frame)
return;
if (frame->HasDebugInformation() &&
(GetProcess()->GetWarningsOptimization() ||
GetProcess()->GetWarningsUnsupportedLanguage())) {
SymbolContext sc =
frame->GetSymbolContext(eSymbolContextFunction | eSymbolContextModule);
GetProcess()->PrintWarningOptimization(sc);
GetProcess()->PrintWarningUnsupportedLanguage(sc);
}
}
lldb::StopInfoSP Thread::GetStopInfo() {
if (m_destroy_called)
return m_stop_info_sp;
ThreadPlanSP completed_plan_sp(GetCompletedPlan());
ProcessSP process_sp(GetProcess());
const uint32_t stop_id = process_sp ? process_sp->GetStopID() : UINT32_MAX;
// Here we select the stop info according to priorirty: - m_stop_info_sp (if
// not trace) - preset value - completed plan stop info - new value with plan
// from completed plan stack - m_stop_info_sp (trace stop reason is OK now) -
// ask GetPrivateStopInfo to set stop info
bool have_valid_stop_info = m_stop_info_sp &&
m_stop_info_sp ->IsValid() &&
m_stop_info_stop_id == stop_id;
bool have_valid_completed_plan = completed_plan_sp && completed_plan_sp->PlanSucceeded();
bool plan_failed = completed_plan_sp && !completed_plan_sp->PlanSucceeded();
bool plan_overrides_trace =
have_valid_stop_info && have_valid_completed_plan
&& (m_stop_info_sp->GetStopReason() == eStopReasonTrace);
if (have_valid_stop_info && !plan_overrides_trace && !plan_failed) {
return m_stop_info_sp;
} else if (completed_plan_sp) {
return StopInfo::CreateStopReasonWithPlan(
completed_plan_sp, GetReturnValueObject(), GetExpressionVariable());
} else {
GetPrivateStopInfo();
return m_stop_info_sp;
}
}
void Thread::CalculatePublicStopInfo() {
ResetStopInfo();
SetStopInfo(GetStopInfo());
}
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())
SetStopInfo(StopInfoSP());
}
}
// The stop info can be manually set by calling Thread::SetStopInfo() prior
// to this function ever getting called, so we can't rely on
// "m_stop_info_stop_id != process_stop_id" as the condition for the if
// statement below, we must also check the stop info to see if we need to
// override it. See the header documentation in
// Architecture::OverrideStopInfo() for more information on the stop
// info override callback.
if (m_stop_info_override_stop_id != process_stop_id) {
m_stop_info_override_stop_id = process_stop_id;
if (m_stop_info_sp) {
if (const Architecture *arch =
process_sp->GetTarget().GetArchitecturePlugin())
arch->OverrideStopInfo(*this);
}
}
}
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;
}
bool Thread::StopInfoIsUpToDate() const {
ProcessSP process_sp(GetProcess());
if (process_sp)
return m_stop_info_stop_id == process_sp->GetStopID();
else
return true; // Process is no longer around so stop info is always up to
// date...
}
void Thread::ResetStopInfo() {
if (m_stop_info_sp) {
m_stop_info_sp.reset();
}
}
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));
LLDB_LOGF(log, "%p: tid = 0x%" PRIx64 ": stop info = %s (stop_id = %u)",
static_cast<void *>(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) {
saved_state.register_backup_sp.reset();
lldb::StackFrameSP frame_sp(GetStackFrameAtIndex(0));
if (frame_sp) {
lldb::RegisterCheckpointSP reg_checkpoint_sp(
new RegisterCheckpoint(RegisterCheckpoint::Reason::eExpression));
if (reg_checkpoint_sp) {
lldb::RegisterContextSP reg_ctx_sp(frame_sp->GetRegisterContext());
if (reg_ctx_sp && reg_ctx_sp->ReadAllRegisterValues(*reg_checkpoint_sp))
saved_state.register_backup_sp = reg_checkpoint_sp;
}
}
if (!saved_state.register_backup_sp)
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();
saved_state.m_completed_plan_checkpoint =
GetPlans().CheckpointCompletedPlans();
return true;
}
bool Thread::RestoreRegisterStateFromCheckpoint(
ThreadStateCheckpoint &saved_state) {
if (saved_state.register_backup_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(*saved_state.register_backup_sp);
// Clear out all stack frames as our world just changed.
ClearStackFrames();
reg_ctx_sp->InvalidateIfNeeded(true);
if (m_unwinder_up)
m_unwinder_up->Clear();
return ret;
}
}
}
return false;
}
void 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);
GetPlans().RestoreCompletedPlanCheckpoint(
saved_state.m_completed_plan_checkpoint);
}
StateType Thread::GetState() const {
// If any other threads access this we will need a mutex for it
std::lock_guard<std::recursive_mutex> guard(m_state_mutex);
return m_state;
}
void Thread::SetState(StateType state) {
std::lock_guard<std::recursive_mutex> guard(m_state_mutex);
m_state = state;
}
std::string Thread::GetStopDescription() {
StackFrameSP frame_sp = GetStackFrameAtIndex(0);
if (!frame_sp)
return GetStopDescriptionRaw();
auto recognized_frame_sp = frame_sp->GetRecognizedFrame();
if (!recognized_frame_sp)
return GetStopDescriptionRaw();
std::string recognized_stop_description =
recognized_frame_sp->GetStopDescription();
if (!recognized_stop_description.empty())
return recognized_stop_description;
return GetStopDescriptionRaw();
}
std::string Thread::GetStopDescriptionRaw() {
StopInfoSP stop_info_sp = GetStopInfo();
std::string raw_stop_description;
if (stop_info_sp && stop_info_sp->IsValid()) {
raw_stop_description = stop_info_sp->GetDescription();
assert((!raw_stop_description.empty() ||
stop_info_sp->GetStopReason() == eStopReasonNone) &&
"StopInfo returned an empty description.");
}
return raw_stop_description;
}
void Thread::SelectMostRelevantFrame() {
Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD);
auto frames_list_sp = GetStackFrameList();
// Only the top frame should be recognized.
auto frame_sp = frames_list_sp->GetFrameAtIndex(0);
auto recognized_frame_sp = frame_sp->GetRecognizedFrame();
if (!recognized_frame_sp) {
LLDB_LOG(log, "Frame #0 not recognized");
return;
}
if (StackFrameSP most_relevant_frame_sp =
recognized_frame_sp->GetMostRelevantFrame()) {
LLDB_LOG(log, "Found most relevant frame at index {0}",
most_relevant_frame_sp->GetFrameIndex());
SetSelectedFrame(most_relevant_frame_sp.get());
} else {
LLDB_LOG(log, "No relevant frame!");
}
}
void Thread::WillStop() {
ThreadPlan *current_plan = GetCurrentPlan();
SelectMostRelevantFrame();
// 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.
lldb::RegisterContextSP reg_ctx_sp(GetRegisterContext());
if (reg_ctx_sp) {
const addr_t thread_pc = reg_ctx_sp->GetPC();
BreakpointSiteSP bp_site_sp =
GetProcess()->GetBreakpointSiteList().FindByAddress(thread_pc);
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();
bool push_step_over_bp_plan = false;
if (cur_plan->GetKind() == ThreadPlan::eKindStepOverBreakpoint) {
ThreadPlanStepOverBreakpoint *bp_plan =
(ThreadPlanStepOverBreakpoint *)cur_plan;
if (bp_plan->GetBreakpointLoadAddress() != thread_pc)
push_step_over_bp_plan = true;
} else
push_step_over_bp_plan = true;
if (push_step_over_bp_plan) {
ThreadPlanSP step_bp_plan_sp(new ThreadPlanStepOverBreakpoint(*this));
if (step_bp_plan_sp) {
step_bp_plan_sp->SetPrivate(true);
if (GetCurrentPlan()->RunState() != eStateStepping) {
ThreadPlanStepOverBreakpoint *step_bp_plan =
static_cast<ThreadPlanStepOverBreakpoint *>(
step_bp_plan_sp.get());
step_bp_plan->SetAutoContinue(true);
}
QueueThreadPlan(step_bp_plan_sp, false);
}
}
}
}
}
}
bool Thread::ShouldResume(StateType resume_state) {
// At this point clear the completed plan stack.
GetPlans().WillResume();
m_override_should_notify = eLazyBoolCalculate;
StateType prev_resume_state = GetTemporaryResumeState();
SetTemporaryResumeState(resume_state);
lldb::ThreadSP backing_thread_sp(GetBackingThread());
if (backing_thread_sp)
backing_thread_sp->SetTemporaryResumeState(resume_state);
// Make sure m_stop_info_sp is valid. Don't do this for threads we suspended
// in the previous run.
if (prev_resume_state != eStateSuspended)
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)) != nullptr) {
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) {
LLDB_LOGF(log,
"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) {
LLDB_LOGF(log,
"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()) {
LLDB_LOGF(log,
"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) {
LLDB_LOGF(log,
"Thread::%s(%p) for tid = 0x%4.4" PRIx64 " 0x%4.4" PRIx64
", pc = 0x%16.16" PRIx64,
__FUNCTION__, static_cast<void *>(this), GetID(), GetProtocolID(),
GetRegisterContext() ? GetRegisterContext()->GetPC()
: LLDB_INVALID_ADDRESS);
LLDB_LOGF(log, "^^^^^^^^ Thread::ShouldStop Begin ^^^^^^^^");
StreamString s;
s.IndentMore();
GetProcess()->DumpThreadPlansForTID(
s, GetID(), eDescriptionLevelVerbose, true /* internal */,
false /* condense_trivial */, true /* skip_unreported */);
LLDB_LOGF(log, "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)) {
LLDB_LOGF(log, "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)) != nullptr) {
if (plan_ptr->PlanExplainsStop(event_ptr)) {
LLDB_LOGF(log, "Plan %s explains stop.", plan_ptr->GetName());
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.
done_processing_current_plan =
(plan_ptr->IsMasterPlan() && !plan_ptr->OkayToDiscard());
} else
done_processing_current_plan = true;
break;
}
}
}
}
if (!done_processing_current_plan) {
bool override_stop = false;
// We're starting from the base plan, so just let it decide;
if (current_plan->IsBasePlan()) {
should_stop = current_plan->ShouldStop(event_ptr);
LLDB_LOGF(log, "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 (true) {
if (current_plan->IsBasePlan())
break;
should_stop = current_plan->ShouldStop(event_ptr);
LLDB_LOGF(log, "Plan %s should stop: %d.", current_plan->GetName(),
should_stop);
if (current_plan->MischiefManaged()) {
if (should_stop)
current_plan->WillStop();
if (current_plan->ShouldAutoContinue(event_ptr)) {
override_stop = true;
LLDB_LOGF(log, "Plan %s auto-continue: true.",
current_plan->GetName());
}
// If a Master Plan wants to stop, we let it. Otherwise, see if the
// plan's parent wants to stop.
PopPlan();
if (should_stop && current_plan->IsMasterPlan() &&
!current_plan->OkayToDiscard()) {
break;
}
current_plan = GetCurrentPlan();
if (current_plan == nullptr) {
break;
}
} else {
break;
}
}
}
if (override_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();
// Discard the stale plans and all plans below them in the stack, plus move
// the completed plans to the completed plan stack
while (!plan_ptr->IsBasePlan()) {
bool stale = plan_ptr->IsPlanStale();
ThreadPlan *examined_plan = plan_ptr;
plan_ptr = GetPreviousPlan(examined_plan);
if (stale) {
LLDB_LOGF(
log,
"Plan %s being discarded in cleanup, it says it is already done.",
examined_plan->GetName());
while (GetCurrentPlan() != examined_plan) {
DiscardPlan();
}
if (examined_plan->IsPlanComplete()) {
// plan is complete but does not explain the stop (example: step to a
// line with breakpoint), let us move the plan to
// completed_plan_stack anyway
PopPlan();
} else
DiscardPlan();
}
}
}
if (log) {
StreamString s;
s.IndentMore();
GetProcess()->DumpThreadPlansForTID(
s, GetID(), eDescriptionLevelVerbose, true /* internal */,
false /* condense_trivial */, true /* skip_unreported */);
LLDB_LOGF(log, "Plan stack final state:\n%s", s.GetData());
LLDB_LOGF(log, "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) {
LLDB_LOGF(log,
"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) {
LLDB_LOGF(log,
"Thread::ShouldReportStop() tid = 0x%4.4" PRIx64
": returning vote %i (temporary state was suspended or invalid)",
GetID(), eVoteNoOpinion);
return eVoteNoOpinion;
}
if (!ThreadStoppedForAReason()) {
LLDB_LOGF(log,
"Thread::ShouldReportStop() tid = 0x%4.4" PRIx64
": returning vote %i (thread didn't stop for a reason.)",
GetID(), eVoteNoOpinion);
return eVoteNoOpinion;
}
if (GetPlans().AnyCompletedPlans()) {
// Pass skip_private = false to GetCompletedPlan, since we want to ask
// the last plan, regardless of whether it is private or not.
LLDB_LOGF(log,
"Thread::ShouldReportStop() tid = 0x%4.4" PRIx64
": returning vote for complete stack's back plan",
GetID());
return GetPlans().GetCompletedPlan(false)->ShouldReportStop(event_ptr);
} else {
Vote thread_vote = eVoteNoOpinion;
ThreadPlan *plan_ptr = GetCurrentPlan();
while (true) {
if (plan_ptr->PlanExplainsStop(event_ptr)) {
thread_vote = plan_ptr->ShouldReportStop(event_ptr);
break;
}
if (plan_ptr->IsBasePlan())
break;
else
plan_ptr = GetPreviousPlan(plan_ptr);
}
LLDB_LOGF(log,
"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 (GetPlans().AnyCompletedPlans()) {
// Pass skip_private = false to GetCompletedPlan, since we want to ask
// the last plan, regardless of whether it is private or not.
LLDB_LOGF(log,
"Current Plan for thread %d(%p) (0x%4.4" PRIx64
", %s): %s being asked whether we should report run.",
GetIndexID(), static_cast<void *>(this), GetID(),
StateAsCString(GetTemporaryResumeState()),
GetCompletedPlan()->GetName());
return GetPlans().GetCompletedPlan(false)->ShouldReportRun(event_ptr);
} else {
LLDB_LOGF(log,
"Current Plan for thread %d(%p) (0x%4.4" PRIx64
", %s): %s being asked whether we should report run.",
GetIndexID(), static_cast<void *>(this), GetID(),
StateAsCString(GetTemporaryResumeState()),
GetCurrentPlan()->GetName());
return GetCurrentPlan()->ShouldReportRun(event_ptr);
}
}
bool Thread::MatchesSpec(const ThreadSpec *spec) {
return (spec == nullptr) ? true : spec->ThreadPassesBasicTests(*this);
}
ThreadPlanStack &Thread::GetPlans() const {
ThreadPlanStack *plans = GetProcess()->FindThreadPlans(GetID());
if (plans)
return *plans;
// History threads don't have a thread plan, but they do ask get asked to
// describe themselves, which usually involves pulling out the stop reason.
// That in turn will check for a completed plan on the ThreadPlanStack.
// Instead of special-casing at that point, we return a Stack with a
// ThreadPlanNull as its base plan. That will give the right answers to the
// queries GetDescription makes, and only assert if you try to run the thread.
if (!m_null_plan_stack_up)
m_null_plan_stack_up = std::make_unique<ThreadPlanStack>(*this, true);
return *(m_null_plan_stack_up.get());
}
void Thread::PushPlan(ThreadPlanSP thread_plan_sp) {
assert(thread_plan_sp && "Don't push an empty thread plan.");
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
if (log) {
StreamString s;
thread_plan_sp->GetDescription(&s, lldb::eDescriptionLevelFull);
LLDB_LOGF(log, "Thread::PushPlan(0x%p): \"%s\", tid = 0x%4.4" PRIx64 ".",
static_cast<void *>(this), s.GetData(),
thread_plan_sp->GetThread().GetID());
}
GetPlans().PushPlan(std::move(thread_plan_sp));
}
void Thread::PopPlan() {
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
ThreadPlanSP popped_plan_sp = GetPlans().PopPlan();
if (log) {
LLDB_LOGF(log, "Popping plan: \"%s\", tid = 0x%4.4" PRIx64 ".",
popped_plan_sp->GetName(), popped_plan_sp->GetThread().GetID());
}
}
void Thread::DiscardPlan() {
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
ThreadPlanSP discarded_plan_sp = GetPlans().PopPlan();
LLDB_LOGF(log, "Discarding plan: \"%s\", tid = 0x%4.4" PRIx64 ".",
discarded_plan_sp->GetName(),
discarded_plan_sp->GetThread().GetID());
}
void Thread::AutoCompleteThreadPlans(CompletionRequest &request) const {
const ThreadPlanStack &plans = GetPlans();
if (!plans.AnyPlans())
return;
// Iterate from the second plan (index: 1) to skip the base plan.
ThreadPlanSP p;
uint32_t i = 1;
while ((p = plans.GetPlanByIndex(i, false))) {
StreamString strm;
p->GetDescription(&strm, eDescriptionLevelInitial);
request.TryCompleteCurrentArg(std::to_string(i), strm.GetString());
i++;
}
}
ThreadPlan *Thread::GetCurrentPlan() const {
return GetPlans().GetCurrentPlan().get();
}
ThreadPlanSP Thread::GetCompletedPlan() const {
return GetPlans().GetCompletedPlan();
}
ValueObjectSP Thread::GetReturnValueObject() const {
return GetPlans().GetReturnValueObject();
}
ExpressionVariableSP Thread::GetExpressionVariable() const {
return GetPlans().GetExpressionVariable();
}
bool Thread::IsThreadPlanDone(ThreadPlan *plan) const {
return GetPlans().IsPlanDone(plan);
}
bool Thread::WasThreadPlanDiscarded(ThreadPlan *plan) const {
return GetPlans().WasPlanDiscarded(plan);
}
bool Thread::CompletedPlanOverridesBreakpoint() const {
return GetPlans().AnyCompletedPlans();
}
ThreadPlan *Thread::GetPreviousPlan(ThreadPlan *current_plan) const{
return GetPlans().GetPreviousPlan(current_plan);
}
Status Thread::QueueThreadPlan(ThreadPlanSP &thread_plan_sp,
bool abort_other_plans) {
Status status;
StreamString s;
if (!thread_plan_sp->ValidatePlan(&s)) {
DiscardThreadPlansUpToPlan(thread_plan_sp);
thread_plan_sp.reset();
status.SetErrorString(s.GetString());
return status;
}
if (abort_other_plans)
DiscardThreadPlans(true);
PushPlan(thread_plan_sp);
// This seems a little funny, but I don't want to have to split up the
// constructor and the DidPush in the scripted plan, that seems annoying.
// That means the constructor has to be in DidPush. So I have to validate the
// plan AFTER pushing it, and then take it off again...
if (!thread_plan_sp->ValidatePlan(&s)) {
DiscardThreadPlansUpToPlan(thread_plan_sp);
thread_plan_sp.reset();
status.SetErrorString(s.GetString());
return status;
}
return status;
}
bool Thread::DiscardUserThreadPlansUpToIndex(uint32_t plan_index) {
// Count the user thread plans from the back end to get the number of the one
// we want to discard:
ThreadPlan *up_to_plan_ptr = GetPlans().GetPlanByIndex(plan_index).get();
if (up_to_plan_ptr == nullptr)
return false;
DiscardThreadPlansUpToPlan(up_to_plan_ptr);
return true;
}
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));
LLDB_LOGF(log,
"Discarding thread plans for thread tid = 0x%4.4" PRIx64
", up to %p",
GetID(), static_cast<void *>(up_to_plan_ptr));
GetPlans().DiscardPlansUpToPlan(up_to_plan_ptr);
}
void Thread::DiscardThreadPlans(bool force) {
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
if (log) {
LLDB_LOGF(log,
"Discarding thread plans for thread (tid = 0x%4.4" PRIx64
", force %d)",
GetID(), force);
}
if (force) {
GetPlans().DiscardAllPlans();
return;
}
GetPlans().DiscardConsultingMasterPlans();
}
Status Thread::UnwindInnermostExpression() {
Status error;
ThreadPlan *innermost_expr_plan = GetPlans().GetInnermostExpression();
if (!innermost_expr_plan) {
error.SetErrorString("No expressions currently active on this thread");
return error;
}
DiscardThreadPlansUpToPlan(innermost_expr_plan);
return error;
}
ThreadPlanSP Thread::QueueBasePlan(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,
Status &status) {
ThreadPlanSP thread_plan_sp(new ThreadPlanStepInstruction(
*this, step_over, stop_other_threads, eVoteNoOpinion, eVoteNoOpinion));
status = 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,
Status &status, LazyBool step_out_avoids_code_withoug_debug_info) {
ThreadPlanSP thread_plan_sp;
thread_plan_sp = std::make_shared<ThreadPlanStepOverRange>(
*this, range, addr_context, stop_other_threads,
step_out_avoids_code_withoug_debug_info);
status = QueueThreadPlan(thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
// Call the QueueThreadPlanForStepOverRange method which takes an address
// range.
ThreadPlanSP Thread::QueueThreadPlanForStepOverRange(
bool abort_other_plans, const LineEntry &line_entry,
const SymbolContext &addr_context, lldb::RunMode stop_other_threads,
Status &status, LazyBool step_out_avoids_code_withoug_debug_info) {
const bool include_inlined_functions = true;
auto address_range =
line_entry.GetSameLineContiguousAddressRange(include_inlined_functions);
return QueueThreadPlanForStepOverRange(
abort_other_plans, address_range, addr_context, stop_other_threads,
status, step_out_avoids_code_withoug_debug_info);
}
ThreadPlanSP Thread::QueueThreadPlanForStepInRange(
bool abort_other_plans, const AddressRange &range,
const SymbolContext &addr_context, const char *step_in_target,
lldb::RunMode stop_other_threads, Status &status,
LazyBool step_in_avoids_code_without_debug_info,
LazyBool step_out_avoids_code_without_debug_info) {
ThreadPlanSP thread_plan_sp(new ThreadPlanStepInRange(
*this, range, addr_context, step_in_target, stop_other_threads,
step_in_avoids_code_without_debug_info,
step_out_avoids_code_without_debug_info));
status = QueueThreadPlan(thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
// Call the QueueThreadPlanForStepInRange method which takes an address range.
ThreadPlanSP Thread::QueueThreadPlanForStepInRange(
bool abort_other_plans, const LineEntry &line_entry,
const SymbolContext &addr_context, const char *step_in_target,
lldb::RunMode stop_other_threads, Status &status,
LazyBool step_in_avoids_code_without_debug_info,
LazyBool step_out_avoids_code_without_debug_info) {
const bool include_inlined_functions = false;
return QueueThreadPlanForStepInRange(
abort_other_plans,
line_entry.GetSameLineContiguousAddressRange(include_inlined_functions),
addr_context, step_in_target, stop_other_threads, status,
step_in_avoids_code_without_debug_info,
step_out_avoids_code_without_debug_info);
}
ThreadPlanSP Thread::QueueThreadPlanForStepOut(
bool abort_other_plans, SymbolContext *addr_context, bool first_insn,
bool stop_other_threads, Vote report_stop_vote, Vote report_run_vote,
uint32_t frame_idx, Status &status,
LazyBool step_out_avoids_code_without_debug_info) {
ThreadPlanSP thread_plan_sp(new ThreadPlanStepOut(
*this, addr_context, first_insn, stop_other_threads, report_stop_vote,
report_run_vote, frame_idx, step_out_avoids_code_without_debug_info));
status = QueueThreadPlan(thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
ThreadPlanSP Thread::QueueThreadPlanForStepOutNoShouldStop(
bool abort_other_plans, SymbolContext *addr_context, bool first_insn,
bool stop_other_threads, Vote report_stop_vote, Vote report_run_vote,
uint32_t frame_idx, Status &status, bool continue_to_next_branch) {
const bool calculate_return_value =
false; // No need to calculate the return value here.
ThreadPlanSP thread_plan_sp(new ThreadPlanStepOut(
*this, addr_context, first_insn, stop_other_threads, report_stop_vote,
report_run_vote, frame_idx, eLazyBoolNo, continue_to_next_branch,
calculate_return_value));
ThreadPlanStepOut *new_plan =
static_cast<ThreadPlanStepOut *>(thread_plan_sp.get());
new_plan->ClearShouldStopHereCallbacks();
status = QueueThreadPlan(thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
ThreadPlanSP Thread::QueueThreadPlanForStepThrough(StackID &return_stack_id,
bool abort_other_plans,
bool stop_other_threads,
Status &status) {
ThreadPlanSP thread_plan_sp(
new ThreadPlanStepThrough(*this, return_stack_id, stop_other_threads));
if (!thread_plan_sp || !thread_plan_sp->ValidatePlan(nullptr))
return ThreadPlanSP();
status = 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,
Status &status) {
ThreadPlanSP thread_plan_sp(
new ThreadPlanRunToAddress(*this, target_addr, stop_other_threads));
status = 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, Status &status) {
ThreadPlanSP thread_plan_sp(new ThreadPlanStepUntil(
*this, address_list, num_addresses, stop_other_threads, frame_idx));
status = QueueThreadPlan(thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
lldb::ThreadPlanSP Thread::QueueThreadPlanForStepScripted(
bool abort_other_plans, const char *class_name,
StructuredData::ObjectSP extra_args_sp, bool stop_other_threads,
Status &status) {
StructuredDataImpl *extra_args_impl = nullptr;
if (extra_args_sp) {
extra_args_impl = new StructuredDataImpl();
extra_args_impl->SetObjectSP(extra_args_sp);
}
ThreadPlanSP thread_plan_sp(new ThreadPlanPython(*this, class_name,
extra_args_impl));
thread_plan_sp->SetStopOthers(stop_other_threads);
status = QueueThreadPlan(thread_plan_sp, abort_other_plans);
return thread_plan_sp;
}
uint32_t Thread::GetIndexID() const { return m_index_id; }
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() {
std::lock_guard<std::recursive_mutex> guard(m_frame_mutex);
if (!m_curr_frames_sp)
m_curr_frames_sp =
std::make_shared<StackFrameList>(*this, m_prev_frames_sp, true);
return m_curr_frames_sp;
}
void Thread::ClearStackFrames() {
std::lock_guard<std::recursive_mutex> guard(m_frame_mutex);
GetUnwinder().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();
m_extended_info.reset();
m_extended_info_fetched = false;
}
lldb::StackFrameSP Thread::GetFrameWithConcreteFrameIndex(uint32_t unwind_idx) {
return GetStackFrameList()->GetFrameWithConcreteFrameIndex(unwind_idx);
}
Status Thread::ReturnFromFrameWithIndex(uint32_t frame_idx,
lldb::ValueObjectSP return_value_sp,
bool broadcast) {
StackFrameSP frame_sp = GetStackFrameAtIndex(frame_idx);
Status 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);
}
Status Thread::ReturnFromFrame(lldb::StackFrameSP frame_sp,
lldb::ValueObjectSP return_value_sp,
bool broadcast) {
Status 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 (/* DISABLES CODE */ (false) && sc.function != nullptr) {
Type *function_type = sc.function->GetType();
if (function_type) {
CompilerType return_type =
sc.function->GetCompilerType().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";
}
}
Status 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 Status("Cannot locate an address for %s:%i.",
file.GetFilename().AsCString(), line);
} else if (outside_function.size() == 1) {
return Status("%s:%i is outside the current function.",
file.GetFilename().AsCString(), line);
} else {
StreamString sstr;
DumpAddressList(sstr, outside_function, target);
return Status("%s:%i has multiple candidate locations:\n%s",
file.GetFilename().AsCString(), line, sstr.GetData());
}
}
// 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 = std::string(sstr.GetString());
}
if (!reg_ctx->SetPC(dest))
return Status("Cannot change PC to target address.");
return Status();
}
void Thread::DumpUsingSettingsFormat(Stream &strm, uint32_t frame_idx,
bool stop_format) {
ExecutionContext exe_ctx(shared_from_this());
Process *process = exe_ctx.GetProcessPtr();
if (process == nullptr)
return;
StackFrameSP frame_sp;
SymbolContext frame_sc;
if (frame_idx != LLDB_INVALID_FRAME_ID) {
frame_sp = GetStackFrameAtIndex(frame_idx);
if (frame_sp) {
exe_ctx.SetFrameSP(frame_sp);
frame_sc = frame_sp->GetSymbolContext(eSymbolContextEverything);
}
}
const FormatEntity::Entry *thread_format;
if (stop_format)
thread_format = exe_ctx.GetTargetRef().GetDebugger().GetThreadStopFormat();
else
thread_format = exe_ctx.GetTargetRef().GetDebugger().GetThreadFormat();
assert(thread_format);
FormatEntity::Format(*thread_format, strm, frame_sp ? &frame_sc : nullptr,
&exe_ctx, nullptr, nullptr, false, false);
}
void Thread::SettingsInitialize() {}
void Thread::SettingsTerminate() {}
lldb::addr_t Thread::GetThreadPointer() { return LLDB_INVALID_ADDRESS; }
addr_t Thread::GetThreadLocalData(const ModuleSP module,
lldb::addr_t tls_file_addr) {
// The default implementation is to ask the dynamic loader for it. This can
// be overridden for specific platforms.
DynamicLoader *loader = GetProcess()->GetDynamicLoader();
if (loader)
return loader->GetThreadLocalData(module, shared_from_this(),
tls_file_addr);
else
return LLDB_INVALID_ADDRESS;
}
bool Thread::SafeToCallFunctions() {
Process *process = GetProcess().get();
if (process) {
SystemRuntime *runtime = process->GetSystemRuntime();
if (runtime) {
return runtime->SafeToCallFunctionsOnThisThread(shared_from_this());
}
}
return true;
}
lldb::StackFrameSP
Thread::GetStackFrameSPForStackFramePtr(StackFrame *stack_frame_ptr) {
return GetStackFrameList()->GetStackFrameSPForStackFramePtr(stack_frame_ptr);
}
std::string Thread::StopReasonAsString(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 eStopReasonFork:
return "fork";
case eStopReasonVFork:
return "vfork";
case eStopReasonVForkDone:
return "vfork done";
case eStopReasonPlanComplete:
return "plan complete";
case eStopReasonThreadExiting:
return "thread exiting";
case eStopReasonInstrumentation:
return "instrumentation break";
case eStopReasonProcessorTrace:
return "processor trace";
}
return "StopReason = " + std::to_string(reason);
}
std::string Thread::RunModeAsString(lldb::RunMode mode) {
switch (mode) {
case eOnlyThisThread:
return "only this thread";
case eAllThreads:
return "all threads";
case eOnlyDuringStepping:
return "only during stepping";
}
return "RunMode = " + std::to_string(mode);
}
size_t Thread::GetStatus(Stream &strm, uint32_t start_frame,
uint32_t num_frames, uint32_t num_frames_with_source,
bool stop_format, bool only_stacks) {
if (!only_stacks) {
ExecutionContext exe_ctx(shared_from_this());
Target *target = exe_ctx.GetTargetPtr();
Process *process = exe_ctx.GetProcessPtr();
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, stop_format);
}
size_t num_frames_shown = 0;
if (num_frames > 0) {
strm.IndentMore();
const bool show_frame_info = true;
const bool show_frame_unique = only_stacks;
const char *selected_frame_marker = nullptr;
if (num_frames == 1 || only_stacks ||
(GetID() != GetProcess()->GetThreadList().GetSelectedThread()->GetID()))
strm.IndentMore();
else
selected_frame_marker = "* ";
num_frames_shown = GetStackFrameList()->GetStatus(
strm, start_frame, num_frames, show_frame_info, num_frames_with_source,
show_frame_unique, selected_frame_marker);
if (num_frames == 1)
strm.IndentLess();
strm.IndentLess();
}
return num_frames_shown;
}
bool Thread::GetDescription(Stream &strm, lldb::DescriptionLevel level,
bool print_json_thread, bool print_json_stopinfo) {
const bool stop_format = false;
DumpUsingSettingsFormat(strm, 0, stop_format);
strm.Printf("\n");
StructuredData::ObjectSP thread_info = GetExtendedInfo();
if (print_json_thread || print_json_stopinfo) {
if (thread_info && print_json_thread) {
thread_info->Dump(strm);
strm.Printf("\n");
}
if (print_json_stopinfo && m_stop_info_sp) {
StructuredData::ObjectSP stop_info = m_stop_info_sp->GetExtendedInfo();
if (stop_info) {
stop_info->Dump(strm);
strm.Printf("\n");
}
}
return true;
}
if (thread_info) {
StructuredData::ObjectSP activity =
thread_info->GetObjectForDotSeparatedPath("activity");
StructuredData::ObjectSP breadcrumb =
thread_info->GetObjectForDotSeparatedPath("breadcrumb");
StructuredData::ObjectSP messages =
thread_info->GetObjectForDotSeparatedPath("trace_messages");
bool printed_activity = false;
if (activity && activity->GetType() == eStructuredDataTypeDictionary) {
StructuredData::Dictionary *activity_dict = activity->GetAsDictionary();
StructuredData::ObjectSP id = activity_dict->GetValueForKey("id");
StructuredData::ObjectSP name = activity_dict->GetValueForKey("name");
if (name && name->GetType() == eStructuredDataTypeString && id &&
id->GetType() == eStructuredDataTypeInteger) {
strm.Format(" Activity '{0}', {1:x}\n",
name->GetAsString()->GetValue(),
id->GetAsInteger()->GetValue());
}
printed_activity = true;
}
bool printed_breadcrumb = false;
if (breadcrumb && breadcrumb->GetType() == eStructuredDataTypeDictionary) {
if (printed_activity)
strm.Printf("\n");
StructuredData::Dictionary *breadcrumb_dict =
breadcrumb->GetAsDictionary();
StructuredData::ObjectSP breadcrumb_text =
breadcrumb_dict->GetValueForKey("name");
if (breadcrumb_text &&
breadcrumb_text->GetType() == eStructuredDataTypeString) {
strm.Format(" Current Breadcrumb: {0}\n",
breadcrumb_text->GetAsString()->GetValue());
}
printed_breadcrumb = true;
}
if (messages && messages->GetType() == eStructuredDataTypeArray) {
if (printed_breadcrumb)
strm.Printf("\n");
StructuredData::Array *messages_array = messages->GetAsArray();
const size_t msg_count = messages_array->GetSize();
if (msg_count > 0) {
strm.Printf(" %zu trace messages:\n", msg_count);
for (size_t i = 0; i < msg_count; i++) {
StructuredData::ObjectSP message = messages_array->GetItemAtIndex(i);
if (message && message->GetType() == eStructuredDataTypeDictionary) {
StructuredData::Dictionary *message_dict =
message->GetAsDictionary();
StructuredData::ObjectSP message_text =
message_dict->GetValueForKey("message");
if (message_text &&
message_text->GetType() == eStructuredDataTypeString) {
strm.Format(" {0}\n", message_text->GetAsString()->GetValue());
}
}
}
}
}
}
return true;
}
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);
}
Unwind &Thread::GetUnwinder() {
if (!m_unwinder_up)
m_unwinder_up = std::make_unique<UnwindLLDB>(*this);
return *m_unwinder_up;
}
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 && static_cast<break_id_t>(value) == bp_site_sp->GetID())
return true;
}
}
}
return false;
}
Status Thread::StepIn(bool source_step,
LazyBool step_in_avoids_code_without_debug_info,
LazyBool step_out_avoids_code_without_debug_info)
{
Status error;
Process *process = GetProcess().get();
if (StateIsStoppedState(process->GetState(), true)) {
StackFrameSP frame_sp = GetStackFrameAtIndex(0);
ThreadPlanSP new_plan_sp;
const lldb::RunMode run_mode = eOnlyThisThread;
const bool abort_other_plans = false;
if (source_step && frame_sp && frame_sp->HasDebugInformation()) {
SymbolContext sc(frame_sp->GetSymbolContext(eSymbolContextEverything));
new_plan_sp = QueueThreadPlanForStepInRange(
abort_other_plans, sc.line_entry, sc, nullptr, run_mode, error,
step_in_avoids_code_without_debug_info,
step_out_avoids_code_without_debug_info);
} else {
new_plan_sp = QueueThreadPlanForStepSingleInstruction(
false, abort_other_plans, run_mode, error);
}
new_plan_sp->SetIsMasterPlan(true);
new_plan_sp->SetOkayToDiscard(false);
// Why do we need to set the current thread by ID here???
process->GetThreadList().SetSelectedThreadByID(GetID());
error = process->Resume();
} else {
error.SetErrorString("process not stopped");
}
return error;
}
Status Thread::StepOver(bool source_step,
LazyBool step_out_avoids_code_without_debug_info) {
Status error;
Process *process = GetProcess().get();
if (StateIsStoppedState(process->GetState(), true)) {
StackFrameSP frame_sp = GetStackFrameAtIndex(0);
ThreadPlanSP new_plan_sp;
const lldb::RunMode run_mode = eOnlyThisThread;
const bool abort_other_plans = false;
if (source_step && frame_sp && frame_sp->HasDebugInformation()) {
SymbolContext sc(frame_sp->GetSymbolContext(eSymbolContextEverything));
new_plan_sp = QueueThreadPlanForStepOverRange(
abort_other_plans, sc.line_entry, sc, run_mode, error,
step_out_avoids_code_without_debug_info);
} else {
new_plan_sp = QueueThreadPlanForStepSingleInstruction(
true, abort_other_plans, run_mode, error);
}
new_plan_sp->SetIsMasterPlan(true);
new_plan_sp->SetOkayToDiscard(false);
// Why do we need to set the current thread by ID here???
process->GetThreadList().SetSelectedThreadByID(GetID());
error = process->Resume();
} else {
error.SetErrorString("process not stopped");
}
return error;
}
Status Thread::StepOut() {
Status error;
Process *process = GetProcess().get();
if (StateIsStoppedState(process->GetState(), true)) {
const bool first_instruction = false;
const bool stop_other_threads = false;
const bool abort_other_plans = false;
ThreadPlanSP new_plan_sp(QueueThreadPlanForStepOut(
abort_other_plans, nullptr, first_instruction, stop_other_threads,
eVoteYes, eVoteNoOpinion, 0, error));
new_plan_sp->SetIsMasterPlan(true);
new_plan_sp->SetOkayToDiscard(false);
// Why do we need to set the current thread by ID here???
process->GetThreadList().SetSelectedThreadByID(GetID());
error = process->Resume();
} else {
error.SetErrorString("process not stopped");
}
return error;
}
ValueObjectSP Thread::GetCurrentException() {
if (auto frame_sp = GetStackFrameAtIndex(0))
if (auto recognized_frame = frame_sp->GetRecognizedFrame())
if (auto e = recognized_frame->GetExceptionObject())
return e;
// NOTE: Even though this behavior is generalized, only ObjC is actually
// supported at the moment.
for (LanguageRuntime *runtime : GetProcess()->GetLanguageRuntimes()) {
if (auto e = runtime->GetExceptionObjectForThread(shared_from_this()))
return e;
}
return ValueObjectSP();
}
ThreadSP Thread::GetCurrentExceptionBacktrace() {
ValueObjectSP exception = GetCurrentException();
if (!exception)
return ThreadSP();
// NOTE: Even though this behavior is generalized, only ObjC is actually
// supported at the moment.
for (LanguageRuntime *runtime : GetProcess()->GetLanguageRuntimes()) {
if (auto bt = runtime->GetBacktraceThreadFromException(exception))
return bt;
}
return ThreadSP();
}
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