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//===-- ThreadPlanShouldStopHere.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/ThreadPlanShouldStopHere.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Thread.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
using namespace lldb;
using namespace lldb_private;
// ThreadPlanShouldStopHere constructor
ThreadPlanShouldStopHere::ThreadPlanShouldStopHere(ThreadPlan *owner)
: m_callbacks(), m_baton(nullptr), m_owner(owner),
m_flags(ThreadPlanShouldStopHere::eNone) {
m_callbacks.should_stop_here_callback =
ThreadPlanShouldStopHere::DefaultShouldStopHereCallback;
m_callbacks.step_from_here_callback =
ThreadPlanShouldStopHere::DefaultStepFromHereCallback;
}
ThreadPlanShouldStopHere::ThreadPlanShouldStopHere(
ThreadPlan *owner, const ThreadPlanShouldStopHereCallbacks *callbacks,
void *baton)
: m_callbacks(), m_baton(), m_owner(owner),
m_flags(ThreadPlanShouldStopHere::eNone) {
SetShouldStopHereCallbacks(callbacks, baton);
}
ThreadPlanShouldStopHere::~ThreadPlanShouldStopHere() = default;
bool ThreadPlanShouldStopHere::InvokeShouldStopHereCallback(
FrameComparison operation, Status &status) {
bool should_stop_here = true;
if (m_callbacks.should_stop_here_callback) {
should_stop_here = m_callbacks.should_stop_here_callback(
m_owner, m_flags, operation, status, m_baton);
Log *log = GetLog(LLDBLog::Step);
if (log) {
lldb::addr_t current_addr =
m_owner->GetThread().GetRegisterContext()->GetPC(0);
LLDB_LOGF(log, "ShouldStopHere callback returned %u from 0x%" PRIx64 ".",
should_stop_here, current_addr);
}
}
return should_stop_here;
}
bool ThreadPlanShouldStopHere::DefaultShouldStopHereCallback(
ThreadPlan *current_plan, Flags &flags, FrameComparison operation,
Status &status, void *baton) {
bool should_stop_here = true;
StackFrame *frame = current_plan->GetThread().GetStackFrameAtIndex(0).get();
if (!frame)
return true;
Log *log = GetLog(LLDBLog::Step);
if ((operation == eFrameCompareOlder && flags.Test(eStepOutAvoidNoDebug)) ||
(operation == eFrameCompareYounger && flags.Test(eStepInAvoidNoDebug)) ||
(operation == eFrameCompareSameParent &&
flags.Test(eStepInAvoidNoDebug))) {
if (!frame->HasDebugInformation()) {
LLDB_LOGF(log, "Stepping out of frame with no debug info");
should_stop_here = false;
}
}
// Always avoid code with line number 0.
// FIXME: At present the ShouldStop and the StepFromHere calculate this
// independently. If this ever
// becomes expensive (this one isn't) we can try to have this set a state
// that the StepFromHere can use.
if (frame) {
SymbolContext sc;
sc = frame->GetSymbolContext(eSymbolContextLineEntry);
if (sc.line_entry.line == 0)
should_stop_here = false;
}
return should_stop_here;
}
ThreadPlanSP ThreadPlanShouldStopHere::DefaultStepFromHereCallback(
ThreadPlan *current_plan, Flags &flags, FrameComparison operation,
Status &status, void *baton) {
const bool stop_others = false;
const size_t frame_index = 0;
ThreadPlanSP return_plan_sp;
// If we are stepping through code at line number 0, then we need to step
// over this range. Otherwise we will step out.
Log *log = GetLog(LLDBLog::Step);
StackFrame *frame = current_plan->GetThread().GetStackFrameAtIndex(0).get();
if (!frame)
return return_plan_sp;
SymbolContext sc;
sc = frame->GetSymbolContext(eSymbolContextLineEntry | eSymbolContextSymbol);
if (sc.line_entry.line == 0) {
AddressRange range = sc.line_entry.range;
// If the whole function is marked line 0 just step out, that's easier &
// faster than continuing to step through it.
bool just_step_out = false;
if (sc.symbol && sc.symbol->ValueIsAddress()) {
Address symbol_end = sc.symbol->GetAddress();
symbol_end.Slide(sc.symbol->GetByteSize() - 1);
if (range.ContainsFileAddress(sc.symbol->GetAddress()) &&
range.ContainsFileAddress(symbol_end)) {
LLDB_LOGF(log, "Stopped in a function with only line 0 lines, just "
"stepping out.");
just_step_out = true;
}
}
if (!just_step_out) {
LLDB_LOGF(log, "ThreadPlanShouldStopHere::DefaultStepFromHereCallback "
"Queueing StepInRange plan to step through line 0 code.");
return_plan_sp = current_plan->GetThread().QueueThreadPlanForStepInRange(
false, range, sc, nullptr, eOnlyDuringStepping, status,
eLazyBoolCalculate, eLazyBoolNo);
}
}
if (!return_plan_sp)
return_plan_sp =
current_plan->GetThread().QueueThreadPlanForStepOutNoShouldStop(
false, nullptr, true, stop_others, eVoteNo, eVoteNoOpinion,
frame_index, status, true);
return return_plan_sp;
}
ThreadPlanSP ThreadPlanShouldStopHere::QueueStepOutFromHerePlan(
lldb_private::Flags &flags, lldb::FrameComparison operation,
Status &status) {
ThreadPlanSP return_plan_sp;
if (m_callbacks.step_from_here_callback) {
return_plan_sp = m_callbacks.step_from_here_callback(
m_owner, flags, operation, status, m_baton);
}
return return_plan_sp;
}
lldb::ThreadPlanSP ThreadPlanShouldStopHere::CheckShouldStopHereAndQueueStepOut(
lldb::FrameComparison operation, Status &status) {
if (!InvokeShouldStopHereCallback(operation, status))
return QueueStepOutFromHerePlan(m_flags, operation, status);
else
return ThreadPlanSP();
}
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