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//===-- ThreadPlanStepOverBreakpoint.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/ThreadPlanStepOverBreakpoint.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"
using namespace lldb;
using namespace lldb_private;
//----------------------------------------------------------------------
// ThreadPlanStepOverBreakpoint: Single steps over a breakpoint bp_site_sp at the pc.
//----------------------------------------------------------------------
ThreadPlanStepOverBreakpoint::ThreadPlanStepOverBreakpoint (Thread &thread) :
ThreadPlan (ThreadPlan::eKindStepOverBreakpoint, "Step over breakpoint trap",
thread,
eVoteNo,
eVoteNoOpinion), // We need to report the run since this happens
// first in the thread plan stack when stepping
// over a breakpoint
m_breakpoint_addr (LLDB_INVALID_ADDRESS),
m_auto_continue(false),
m_reenabled_breakpoint_site (false)
{
m_breakpoint_addr = m_thread.GetRegisterContext()->GetPC();
m_breakpoint_site_id = m_thread.GetProcess()->GetBreakpointSiteList().FindIDByAddress (m_breakpoint_addr);
}
ThreadPlanStepOverBreakpoint::~ThreadPlanStepOverBreakpoint ()
{
}
void
ThreadPlanStepOverBreakpoint::GetDescription (Stream *s, lldb::DescriptionLevel level)
{
s->Printf("Single stepping past breakpoint site %" PRIu64 " at 0x%" PRIx64, m_breakpoint_site_id, (uint64_t)m_breakpoint_addr);
}
bool
ThreadPlanStepOverBreakpoint::ValidatePlan (Stream *error)
{
return true;
}
bool
ThreadPlanStepOverBreakpoint::DoPlanExplainsStop (Event *event_ptr)
{
StopInfoSP stop_info_sp = GetPrivateStopInfo ();
if (stop_info_sp)
{
// It's a little surprising that we stop here for a breakpoint hit. However, when you single step ONTO a breakpoint
// we still want to call that a breakpoint hit, and trigger the actions, etc. Otherwise you would see the
// PC at the breakpoint without having triggered the actions, then you'd continue, the PC wouldn't change,
// and you'd see the breakpoint hit, which would be odd.
// So the lower levels fake "step onto breakpoint address" and return that as a breakpoint. So our trace
// step COULD appear as a breakpoint hit if the next instruction also contained a breakpoint.
StopReason reason = stop_info_sp->GetStopReason();
switch (reason)
{
case eStopReasonTrace:
case eStopReasonNone:
return true;
case eStopReasonBreakpoint:
// It's a little surprising that we stop here for a breakpoint hit. However, when you single step ONTO a
// breakpoint we still want to call that a breakpoint hit, and trigger the actions, etc. Otherwise you
// would see the PC at the breakpoint without having triggered the actions, then you'd continue, the PC
// wouldn't change, and you'd see the breakpoint hit, which would be odd.
// So the lower levels fake "step onto breakpoint address" and return that as a breakpoint hit. So our trace
// step COULD appear as a breakpoint hit if the next instruction also contained a breakpoint. We don't want
// to handle that, since we really don't know what to do with breakpoint hits. But make sure we don't set
// ourselves to auto-continue or we'll wrench control away from the plans that can deal with this.
SetAutoContinue(false);
return false;
default:
return false;
}
}
return false;
}
bool
ThreadPlanStepOverBreakpoint::ShouldStop (Event *event_ptr)
{
return !ShouldAutoContinue(event_ptr);
}
bool
ThreadPlanStepOverBreakpoint::StopOthers ()
{
return true;
}
StateType
ThreadPlanStepOverBreakpoint::GetPlanRunState ()
{
return eStateStepping;
}
bool
ThreadPlanStepOverBreakpoint::DoWillResume (StateType resume_state, bool current_plan)
{
if (current_plan)
{
BreakpointSiteSP bp_site_sp (m_thread.GetProcess()->GetBreakpointSiteList().FindByAddress (m_breakpoint_addr));
if (bp_site_sp && bp_site_sp->IsEnabled())
m_thread.GetProcess()->DisableBreakpointSite (bp_site_sp.get());
}
return true;
}
bool
ThreadPlanStepOverBreakpoint::WillStop ()
{
ReenableBreakpointSite ();
return true;
}
bool
ThreadPlanStepOverBreakpoint::MischiefManaged ()
{
lldb::addr_t pc_addr = m_thread.GetRegisterContext()->GetPC();
if (pc_addr == m_breakpoint_addr)
{
// If we are still at the PC of our breakpoint, then for some reason we didn't
// get a chance to run.
return false;
}
else
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (log)
log->Printf("Completed step over breakpoint plan.");
// Otherwise, re-enable the breakpoint we were stepping over, and we're done.
ReenableBreakpointSite ();
ThreadPlan::MischiefManaged ();
return true;
}
}
void
ThreadPlanStepOverBreakpoint::ReenableBreakpointSite ()
{
if (!m_reenabled_breakpoint_site)
{
m_reenabled_breakpoint_site = true;
BreakpointSiteSP bp_site_sp (m_thread.GetProcess()->GetBreakpointSiteList().FindByAddress (m_breakpoint_addr));
if (bp_site_sp)
{
m_thread.GetProcess()->EnableBreakpointSite (bp_site_sp.get());
}
}
}
void
ThreadPlanStepOverBreakpoint::ThreadDestroyed ()
{
ReenableBreakpointSite ();
}
void
ThreadPlanStepOverBreakpoint::SetAutoContinue (bool do_it)
{
m_auto_continue = do_it;
}
bool
ThreadPlanStepOverBreakpoint::ShouldAutoContinue (Event *event_ptr)
{
return m_auto_continue;
}
bool
ThreadPlanStepOverBreakpoint::IsPlanStale()
{
return m_thread.GetRegisterContext()->GetPC() != m_breakpoint_addr;
}
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