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//===-- ThreadPlanStepOverRange.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/Target/ThreadPlanStepOverRange.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/lldb-private-log.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Stream.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlanStepOut.h"
#include "lldb/Target/ThreadPlanStepThrough.h"
using namespace lldb_private;
using namespace lldb;
//----------------------------------------------------------------------
// ThreadPlanStepOverRange: Step through a stack range, either stepping over or into
// based on the value of \a type.
//----------------------------------------------------------------------
ThreadPlanStepOverRange::ThreadPlanStepOverRange
(
Thread &thread,
const AddressRange &range,
const SymbolContext &addr_context,
lldb::RunMode stop_others
) :
ThreadPlanStepRange (ThreadPlan::eKindStepOverRange, "Step range stepping over", thread, range, addr_context, stop_others)
{
}
ThreadPlanStepOverRange::~ThreadPlanStepOverRange ()
{
}
void
ThreadPlanStepOverRange::GetDescription (Stream *s, lldb::DescriptionLevel level)
{
if (level == lldb::eDescriptionLevelBrief)
s->Printf("step over");
else
{
s->Printf ("stepping through range (stepping over functions): ");
DumpRanges(s);
}
}
bool
ThreadPlanStepOverRange::ShouldStop (Event *event_ptr)
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (log)
{
StreamString s;
s.Address (m_thread.GetRegisterContext()->GetPC(),
m_thread.CalculateTarget()->GetArchitecture().GetAddressByteSize());
log->Printf("ThreadPlanStepOverRange reached %s.", s.GetData());
}
// If we're out of the range but in the same frame or in our caller's frame
// then we should stop.
// When stepping out we only step if we are forcing running one thread.
bool stop_others;
if (m_stop_others == lldb::eOnlyThisThread)
stop_others = true;
else
stop_others = false;
ThreadPlan* new_plan = NULL;
FrameComparison frame_order = CompareCurrentFrameToStartFrame();
if (frame_order == eFrameCompareOlder)
{
// If we're in an older frame then we should stop.
//
// A caveat to this is if we think the frame is older but we're actually in a trampoline.
// I'm going to make the assumption that you wouldn't RETURN to a trampoline. So if we are
// in a trampoline we think the frame is older because the trampoline confused the backtracer.
// As below, we step through first, and then try to figure out how to get back out again.
new_plan = m_thread.QueueThreadPlanForStepThrough (m_stack_id, false, stop_others);
if (new_plan != NULL && log)
log->Printf("Thought I stepped out, but in fact arrived at a trampoline.");
}
else if (frame_order == eFrameCompareYounger)
{
// Make sure we really are in a new frame. Do that by unwinding and seeing if the
// start function really is our start function...
StackFrameSP older_frame_sp = m_thread.GetStackFrameAtIndex(1);
// But if we can't even unwind one frame we should just get out of here & stop...
if (older_frame_sp)
{
const SymbolContext &older_context = older_frame_sp->GetSymbolContext(eSymbolContextEverything);
if (older_context == m_addr_context)
{
new_plan = m_thread.QueueThreadPlanForStepOut (false,
NULL,
true,
stop_others,
eVoteNo,
eVoteNoOpinion,
0);
}
else
{
new_plan = m_thread.QueueThreadPlanForStepThrough (m_stack_id, false, stop_others);
}
}
}
else
{
// If we're still in the range, keep going.
if (InRange())
{
SetNextBranchBreakpoint();
return false;
}
if (!InSymbol())
{
// This one is a little tricky. Sometimes we may be in a stub or something similar,
// in which case we need to get out of there. But if we are in a stub then it's
// likely going to be hard to get out from here. It is probably easiest to step into the
// stub, and then it will be straight-forward to step out.
new_plan = m_thread.QueueThreadPlanForStepThrough (m_stack_id, false, stop_others);
}
}
// If we get to this point, we're not going to use a previously set "next branch" breakpoint, so delete it:
ClearNextBranchBreakpoint();
if (new_plan == NULL)
m_no_more_plans = true;
else
m_no_more_plans = false;
if (new_plan == NULL)
{
// For efficiencies sake, we know we're done here so we don't have to do this
// calculation again in MischiefManaged.
SetPlanComplete();
return true;
}
else
return false;
}
bool
ThreadPlanStepOverRange::PlanExplainsStop ()
{
// For crashes, breakpoint hits, signals, etc, let the base plan (or some plan above us)
// handle the stop. That way the user can see the stop, step around, and then when they
// are done, continue and have their step complete. The exception is if we've hit our
// "run to next branch" breakpoint.
// Note, unlike the step in range plan, we don't mark ourselves complete if we hit an
// unexplained breakpoint/crash.
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
StopInfoSP stop_info_sp = GetPrivateStopReason();
if (stop_info_sp)
{
StopReason reason = stop_info_sp->GetStopReason();
switch (reason)
{
case eStopReasonBreakpoint:
if (NextRangeBreakpointExplainsStop(stop_info_sp))
return true;
else
return false;
break;
case eStopReasonWatchpoint:
case eStopReasonSignal:
case eStopReasonException:
if (log)
log->PutCString ("ThreadPlanStepInRange got asked if it explains the stop for some reason other than step.");
return false;
break;
default:
break;
}
}
return true;
}
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