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//===-- ThreadPlanShouldStopHere.cpp ----------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Core/Log.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlanShouldStopHere.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)
{
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, m_baton);
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (log)
{
lldb::addr_t current_addr = m_owner->GetThread().GetRegisterContext()->GetPC(0);
log->Printf ("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,
void *baton)
{
bool should_stop_here = true;
StackFrame *frame = current_plan->GetThread().GetStackFrameAtIndex(0).get();
if (!frame)
return true;
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if ((operation == eFrameCompareOlder && flags.Test(eStepOutAvoidNoDebug))
|| (operation == eFrameCompareYounger && flags.Test(eStepInAvoidNoDebug))
|| (operation == eFrameCompareSameParent && flags.Test(eStepInAvoidNoDebug)))
{
if (!frame->HasDebugInformation())
{
if (log)
log->Printf ("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,
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(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_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))
{
if (log)
log->Printf("Stopped in a function with only line 0 lines, just stepping out.");
just_step_out = true;
}
}
if (!just_step_out)
{
if (log)
log->Printf ("ThreadPlanShouldStopHere::DefaultStepFromHereCallback Queueing StepInRange plan to step through line 0 code.");
return_plan_sp = current_plan->GetThread().QueueThreadPlanForStepInRange(false,
range,
sc,
NULL,
eOnlyDuringStepping,
eLazyBoolCalculate,
eLazyBoolNo);
}
}
if (!return_plan_sp)
return_plan_sp = current_plan->GetThread().QueueThreadPlanForStepOutNoShouldStop(false,
nullptr,
true,
stop_others,
eVoteNo,
eVoteNoOpinion,
frame_index,
true);
return return_plan_sp;
}
ThreadPlanSP
ThreadPlanShouldStopHere::QueueStepOutFromHerePlan(lldb_private::Flags &flags, lldb::FrameComparison operation)
{
ThreadPlanSP return_plan_sp;
if (m_callbacks.step_from_here_callback)
{
return_plan_sp = m_callbacks.step_from_here_callback (m_owner, flags, operation, m_baton);
}
return return_plan_sp;
}
lldb::ThreadPlanSP
ThreadPlanShouldStopHere::CheckShouldStopHereAndQueueStepOut (lldb::FrameComparison operation)
{
if (!InvokeShouldStopHereCallback(operation))
return QueueStepOutFromHerePlan(m_flags, operation);
else
return ThreadPlanSP();
}
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