1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292
|
//===-- ThreadPlan.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/ThreadPlan.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/State.h"
using namespace lldb;
using namespace lldb_private;
// ThreadPlan constructor
ThreadPlan::ThreadPlan(ThreadPlanKind kind, const char *name, Thread &thread,
Vote report_stop_vote, Vote report_run_vote)
: m_process(*thread.GetProcess().get()), m_tid(thread.GetID()),
m_report_stop_vote(report_stop_vote), m_report_run_vote(report_run_vote),
m_takes_iteration_count(false), m_could_not_resolve_hw_bp(false),
m_thread(&thread), m_kind(kind), m_name(name), m_plan_complete_mutex(),
m_cached_plan_explains_stop(eLazyBoolCalculate), m_plan_complete(false),
m_plan_private(false), m_okay_to_discard(true),
m_is_controlling_plan(false), m_plan_succeeded(true) {
SetID(GetNextID());
}
// Destructor
ThreadPlan::~ThreadPlan() = default;
Target &ThreadPlan::GetTarget() { return m_process.GetTarget(); }
const Target &ThreadPlan::GetTarget() const { return m_process.GetTarget(); }
Thread &ThreadPlan::GetThread() {
if (m_thread)
return *m_thread;
ThreadSP thread_sp = m_process.GetThreadList().FindThreadByID(m_tid);
m_thread = thread_sp.get();
return *m_thread;
}
bool ThreadPlan::PlanExplainsStop(Event *event_ptr) {
if (m_cached_plan_explains_stop == eLazyBoolCalculate) {
bool actual_value = DoPlanExplainsStop(event_ptr);
CachePlanExplainsStop(actual_value);
return actual_value;
} else {
return m_cached_plan_explains_stop == eLazyBoolYes;
}
}
bool ThreadPlan::IsPlanComplete() {
std::lock_guard<std::recursive_mutex> guard(m_plan_complete_mutex);
return m_plan_complete;
}
void ThreadPlan::SetPlanComplete(bool success) {
std::lock_guard<std::recursive_mutex> guard(m_plan_complete_mutex);
m_plan_complete = true;
m_plan_succeeded = success;
}
bool ThreadPlan::MischiefManaged() {
std::lock_guard<std::recursive_mutex> guard(m_plan_complete_mutex);
// Mark the plan is complete, but don't override the success flag.
m_plan_complete = true;
return true;
}
Vote ThreadPlan::ShouldReportStop(Event *event_ptr) {
Log *log = GetLog(LLDBLog::Step);
if (m_report_stop_vote == eVoteNoOpinion) {
ThreadPlan *prev_plan = GetPreviousPlan();
if (prev_plan) {
Vote prev_vote = prev_plan->ShouldReportStop(event_ptr);
LLDB_LOG(log, "returning previous thread plan vote: {0}", prev_vote);
return prev_vote;
}
}
LLDB_LOG(log, "Returning vote: {0}", m_report_stop_vote);
return m_report_stop_vote;
}
Vote ThreadPlan::ShouldReportRun(Event *event_ptr) {
if (m_report_run_vote == eVoteNoOpinion) {
ThreadPlan *prev_plan = GetPreviousPlan();
if (prev_plan)
return prev_plan->ShouldReportRun(event_ptr);
}
return m_report_run_vote;
}
void ThreadPlan::ClearThreadCache() { m_thread = nullptr; }
bool ThreadPlan::StopOthers() {
ThreadPlan *prev_plan;
prev_plan = GetPreviousPlan();
return (prev_plan == nullptr) ? false : prev_plan->StopOthers();
}
void ThreadPlan::SetStopOthers(bool new_value) {
// SetStopOthers doesn't work up the hierarchy. You have to set the explicit
// ThreadPlan you want to affect.
}
bool ThreadPlan::WillResume(StateType resume_state, bool current_plan) {
m_cached_plan_explains_stop = eLazyBoolCalculate;
if (current_plan) {
Log *log = GetLog(LLDBLog::Step);
if (log) {
RegisterContext *reg_ctx = GetThread().GetRegisterContext().get();
assert(reg_ctx);
addr_t pc = reg_ctx->GetPC();
addr_t sp = reg_ctx->GetSP();
addr_t fp = reg_ctx->GetFP();
LLDB_LOGF(
log,
"%s Thread #%u (0x%p): tid = 0x%4.4" PRIx64 ", pc = 0x%8.8" PRIx64
", sp = 0x%8.8" PRIx64 ", fp = 0x%8.8" PRIx64 ", "
"plan = '%s', state = %s, stop others = %d",
__FUNCTION__, GetThread().GetIndexID(),
static_cast<void *>(&GetThread()), m_tid, static_cast<uint64_t>(pc),
static_cast<uint64_t>(sp), static_cast<uint64_t>(fp), m_name.c_str(),
StateAsCString(resume_state), StopOthers());
}
}
bool success = DoWillResume(resume_state, current_plan);
ClearThreadCache(); // We don't cache the thread pointer over resumes. This
// Thread might go away, and another Thread represent
// the same underlying object on a later stop.
return success;
}
lldb::user_id_t ThreadPlan::GetNextID() {
static uint32_t g_nextPlanID = 0;
return ++g_nextPlanID;
}
void ThreadPlan::DidPush() {}
void ThreadPlan::DidPop() {}
bool ThreadPlan::OkayToDiscard() {
return IsControllingPlan() ? m_okay_to_discard : true;
}
lldb::StateType ThreadPlan::RunState() {
if (m_tracer_sp && m_tracer_sp->TracingEnabled())
return eStateStepping;
else
return GetPlanRunState();
}
bool ThreadPlan::IsUsuallyUnexplainedStopReason(lldb::StopReason reason) {
switch (reason) {
case eStopReasonWatchpoint:
case eStopReasonSignal:
case eStopReasonException:
case eStopReasonExec:
case eStopReasonThreadExiting:
case eStopReasonInstrumentation:
case eStopReasonFork:
case eStopReasonVFork:
case eStopReasonVForkDone:
return true;
default:
return false;
}
}
// ThreadPlanNull
ThreadPlanNull::ThreadPlanNull(Thread &thread)
: ThreadPlan(ThreadPlan::eKindNull, "Null Thread Plan", thread,
eVoteNoOpinion, eVoteNoOpinion) {}
ThreadPlanNull::~ThreadPlanNull() = default;
void ThreadPlanNull::GetDescription(Stream *s, lldb::DescriptionLevel level) {
s->PutCString("Null thread plan - thread has been destroyed.");
}
bool ThreadPlanNull::ValidatePlan(Stream *error) {
#ifdef LLDB_CONFIGURATION_DEBUG
fprintf(stderr,
"error: %s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#else
Log *log = GetLog(LLDBLog::Thread);
if (log)
log->Error("%s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#endif
return true;
}
bool ThreadPlanNull::ShouldStop(Event *event_ptr) {
#ifdef LLDB_CONFIGURATION_DEBUG
fprintf(stderr,
"error: %s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#else
Log *log = GetLog(LLDBLog::Thread);
if (log)
log->Error("%s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#endif
return true;
}
bool ThreadPlanNull::WillStop() {
#ifdef LLDB_CONFIGURATION_DEBUG
fprintf(stderr,
"error: %s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#else
Log *log = GetLog(LLDBLog::Thread);
if (log)
log->Error("%s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#endif
return true;
}
bool ThreadPlanNull::DoPlanExplainsStop(Event *event_ptr) {
#ifdef LLDB_CONFIGURATION_DEBUG
fprintf(stderr,
"error: %s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, GetThread().GetID(), GetThread().GetProtocolID());
#else
Log *log = GetLog(LLDBLog::Thread);
if (log)
log->Error("%s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#endif
return true;
}
// The null plan is never done.
bool ThreadPlanNull::MischiefManaged() {
// The null plan is never done.
#ifdef LLDB_CONFIGURATION_DEBUG
fprintf(stderr,
"error: %s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#else
Log *log = GetLog(LLDBLog::Thread);
if (log)
log->Error("%s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#endif
return false;
}
lldb::StateType ThreadPlanNull::GetPlanRunState() {
// Not sure what to return here. This is a dead thread.
#ifdef LLDB_CONFIGURATION_DEBUG
fprintf(stderr,
"error: %s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#else
Log *log = GetLog(LLDBLog::Thread);
if (log)
log->Error("%s called on thread that has been destroyed (tid = 0x%" PRIx64
", ptid = 0x%" PRIx64 ")",
LLVM_PRETTY_FUNCTION, m_tid, GetThread().GetProtocolID());
#endif
return eStateRunning;
}
|