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This commit reworks how the thread plan's ShouldStopHere mechanism works, so that it is useful not only

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for customizing "step-in" behavior (e.g. step-in doesn't step into code with no debug info), but also 
the behavior of step-in/step-out and step-over when they step out of the frame they started in.

I also added as a proof of concept of this reworking a mode for stepping where stepping out of a frame
into a frame with no debug information will continue stepping out till it arrives at a frame that does
have debug information.  This is useful when you are debugging callback based code where the callbacks
are separated from the code that initiated them by some library glue you don't care about, among other
things.

llvm-svn: 203747
This commit is contained in:
Jim Ingham
2014-03-13 02:47:14 +00:00
parent 3e89dfee00
commit 4b4b2478fc
17 changed files with 686 additions and 234 deletions
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51
lldb/source/Target/ThreadPlanStepOverRange.cpp
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@@ -31,6 +31,7 @@
using namespace lldb_private;
using namespace lldb;
uint32_t ThreadPlanStepOverRange::s_default_flag_values = 0;
//----------------------------------------------------------------------
// ThreadPlanStepOverRange: Step through a stack range, either stepping over or into
@@ -42,11 +43,15 @@ ThreadPlanStepOverRange::ThreadPlanStepOverRange
Thread &thread,
const AddressRange &range,
const SymbolContext &addr_context,
lldb::RunMode stop_others
lldb::RunMode stop_others,
LazyBool step_out_avoids_code_without_debug_info
) :
ThreadPlanStepRange (ThreadPlan::eKindStepOverRange, "Step range stepping over", thread, range, addr_context, stop_others),
ThreadPlanShouldStopHere (this),
m_first_resume(true)
{
SetFlagsToDefault();
SetupAvoidNoDebug(step_out_avoids_code_without_debug_info);
}
ThreadPlanStepOverRange::~ThreadPlanStepOverRange ()
@@ -65,6 +70,28 @@ ThreadPlanStepOverRange::GetDescription (Stream *s, lldb::DescriptionLevel level
}
}
void
ThreadPlanStepOverRange::SetupAvoidNoDebug(LazyBool step_out_avoids_code_without_debug_info)
{
bool avoid_nodebug = true;
switch (step_out_avoids_code_without_debug_info)
{
case eLazyBoolYes:
avoid_nodebug = true;
break;
case eLazyBoolNo:
avoid_nodebug = false;
break;
case eLazyBoolCalculate:
avoid_nodebug = m_thread.GetStepOutAvoidsNoDebug();
break;
}
if (avoid_nodebug)
GetFlags().Set (ThreadPlanShouldStopHere::eStepOutAvoidNoDebug);
else
GetFlags().Clear (ThreadPlanShouldStopHere::eStepOutAvoidNoDebug);
}
bool
ThreadPlanStepOverRange::IsEquivalentContext(const SymbolContext &context)
{
@@ -146,13 +173,13 @@ ThreadPlanStepOverRange::ShouldStop (Event *event_ptr)
const SymbolContext &older_context = older_frame_sp->GetSymbolContext(eSymbolContextEverything);
if (IsEquivalentContext(older_context))
{
new_plan_sp = m_thread.QueueThreadPlanForStepOut (false,
NULL,
true,
stop_others,
eVoteNo,
eVoteNoOpinion,
0);
new_plan_sp = m_thread.QueueThreadPlanForStepOutNoShouldStop (false,
NULL,
true,
stop_others,
eVoteNo,
eVoteNoOpinion,
0);
break;
}
else
@@ -277,6 +304,13 @@ ThreadPlanStepOverRange::ShouldStop (Event *event_ptr)
// If we get to this point, we're not going to use a previously set "next branch" breakpoint, so delete it:
ClearNextBranchBreakpoint();
// If we haven't figured out something to do yet, then ask the ShouldStopHere callback:
if (!new_plan_sp)
{
new_plan_sp = CheckShouldStopHereAndQueueStepOut (frame_order);
}
if (!new_plan_sp)
m_no_more_plans = true;
else
@@ -390,3 +424,4 @@ ThreadPlanStepOverRange::DoWillResume (lldb::StateType resume_state, bool curren
return true;
}