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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/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/Stream.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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