forked from OSchip/llvm-project
537 lines
18 KiB
C++
537 lines
18 KiB
C++
//===-- ThreadPlanStepOut.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/ThreadPlanStepOut.h"
|
|
|
|
// C Includes
|
|
// C++ Includes
|
|
// Other libraries and framework includes
|
|
// Project includes
|
|
#include "lldb/Breakpoint/Breakpoint.h"
|
|
#include "lldb/lldb-private-log.h"
|
|
#include "lldb/Core/Log.h"
|
|
#include "lldb/Core/Value.h"
|
|
#include "lldb/Core/ValueObjectConstResult.h"
|
|
#include "lldb/Symbol/Block.h"
|
|
#include "lldb/Symbol/Function.h"
|
|
#include "lldb/Symbol/Type.h"
|
|
#include "lldb/Target/Process.h"
|
|
#include "lldb/Target/RegisterContext.h"
|
|
#include "lldb/Target/StopInfo.h"
|
|
#include "lldb/Target/Target.h"
|
|
#include "lldb/Target/ThreadPlanStepOverRange.h"
|
|
#include "lldb/Target/ThreadPlanStepThrough.h"
|
|
|
|
using namespace lldb;
|
|
using namespace lldb_private;
|
|
|
|
uint32_t ThreadPlanStepOut::s_default_flag_values = 0;
|
|
|
|
//----------------------------------------------------------------------
|
|
// ThreadPlanStepOut: Step out of the current frame
|
|
//----------------------------------------------------------------------
|
|
ThreadPlanStepOut::ThreadPlanStepOut
|
|
(
|
|
Thread &thread,
|
|
SymbolContext *context,
|
|
bool first_insn,
|
|
bool stop_others,
|
|
Vote stop_vote,
|
|
Vote run_vote,
|
|
uint32_t frame_idx,
|
|
LazyBool step_out_avoids_code_without_debug_info
|
|
) :
|
|
ThreadPlan (ThreadPlan::eKindStepOut, "Step out", thread, stop_vote, run_vote),
|
|
ThreadPlanShouldStopHere (this),
|
|
m_step_from_insn (LLDB_INVALID_ADDRESS),
|
|
m_return_bp_id (LLDB_INVALID_BREAK_ID),
|
|
m_return_addr (LLDB_INVALID_ADDRESS),
|
|
m_stop_others (stop_others),
|
|
m_immediate_step_from_function(NULL)
|
|
|
|
{
|
|
SetFlagsToDefault();
|
|
SetupAvoidNoDebug(step_out_avoids_code_without_debug_info);
|
|
|
|
m_step_from_insn = m_thread.GetRegisterContext()->GetPC(0);
|
|
|
|
StackFrameSP return_frame_sp (m_thread.GetStackFrameAtIndex(frame_idx + 1));
|
|
StackFrameSP immediate_return_from_sp (m_thread.GetStackFrameAtIndex (frame_idx));
|
|
|
|
if (!return_frame_sp || !immediate_return_from_sp)
|
|
return; // we can't do anything here. ValidatePlan() will return false.
|
|
|
|
m_step_out_to_id = return_frame_sp->GetStackID();
|
|
m_immediate_step_from_id = immediate_return_from_sp->GetStackID();
|
|
|
|
StackID frame_zero_id = m_thread.GetStackFrameAtIndex(0)->GetStackID();
|
|
|
|
// If the frame directly below the one we are returning to is inlined, we have to be
|
|
// a little more careful. It is non-trivial to determine the real "return code address" for
|
|
// an inlined frame, so we have to work our way to that frame and then step out.
|
|
if (immediate_return_from_sp && immediate_return_from_sp->IsInlined())
|
|
{
|
|
if (frame_idx > 0)
|
|
{
|
|
// First queue a plan that gets us to this inlined frame, and when we get there we'll queue a second
|
|
// plan that walks us out of this frame.
|
|
m_step_out_to_inline_plan_sp.reset (new ThreadPlanStepOut(m_thread,
|
|
NULL,
|
|
false,
|
|
stop_others,
|
|
eVoteNoOpinion,
|
|
eVoteNoOpinion,
|
|
frame_idx - 1,
|
|
eLazyBoolNo));
|
|
static_cast<ThreadPlanStepOut *>(m_step_out_to_inline_plan_sp.get())->SetShouldStopHereCallbacks(nullptr, nullptr);
|
|
}
|
|
else
|
|
{
|
|
// If we're already at the inlined frame we're stepping through, then just do that now.
|
|
QueueInlinedStepPlan(false);
|
|
}
|
|
|
|
}
|
|
else if (return_frame_sp)
|
|
{
|
|
// Find the return address and set a breakpoint there:
|
|
// FIXME - can we do this more securely if we know first_insn?
|
|
|
|
m_return_addr = return_frame_sp->GetFrameCodeAddress().GetLoadAddress(&m_thread.GetProcess()->GetTarget());
|
|
|
|
if (m_return_addr == LLDB_INVALID_ADDRESS)
|
|
return;
|
|
|
|
Breakpoint *return_bp = m_thread.CalculateTarget()->CreateBreakpoint (m_return_addr, true, false).get();
|
|
if (return_bp != NULL)
|
|
{
|
|
return_bp->SetThreadID(m_thread.GetID());
|
|
m_return_bp_id = return_bp->GetID();
|
|
return_bp->SetBreakpointKind ("step-out");
|
|
}
|
|
|
|
if (immediate_return_from_sp)
|
|
{
|
|
const SymbolContext &sc = immediate_return_from_sp->GetSymbolContext(eSymbolContextFunction);
|
|
if (sc.function)
|
|
{
|
|
m_immediate_step_from_function = sc.function;
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
void
|
|
ThreadPlanStepOut::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);
|
|
}
|
|
|
|
void
|
|
ThreadPlanStepOut::DidPush()
|
|
{
|
|
if (m_step_out_to_inline_plan_sp)
|
|
m_thread.QueueThreadPlan(m_step_out_to_inline_plan_sp, false);
|
|
else if (m_step_through_inline_plan_sp)
|
|
m_thread.QueueThreadPlan(m_step_through_inline_plan_sp, false);
|
|
}
|
|
|
|
ThreadPlanStepOut::~ThreadPlanStepOut ()
|
|
{
|
|
if (m_return_bp_id != LLDB_INVALID_BREAK_ID)
|
|
m_thread.CalculateTarget()->RemoveBreakpointByID(m_return_bp_id);
|
|
}
|
|
|
|
void
|
|
ThreadPlanStepOut::GetDescription (Stream *s, lldb::DescriptionLevel level)
|
|
{
|
|
if (level == lldb::eDescriptionLevelBrief)
|
|
s->Printf ("step out");
|
|
else
|
|
{
|
|
if (m_step_out_to_inline_plan_sp)
|
|
s->Printf ("Stepping out to inlined frame so we can walk through it.");
|
|
else if (m_step_through_inline_plan_sp)
|
|
s->Printf ("Stepping out by stepping through inlined function.");
|
|
else
|
|
s->Printf ("Stepping out from address 0x%" PRIx64 " to return address 0x%" PRIx64 " using breakpoint site %d",
|
|
(uint64_t)m_step_from_insn,
|
|
(uint64_t)m_return_addr,
|
|
m_return_bp_id);
|
|
}
|
|
}
|
|
|
|
bool
|
|
ThreadPlanStepOut::ValidatePlan (Stream *error)
|
|
{
|
|
if (m_step_out_to_inline_plan_sp)
|
|
return m_step_out_to_inline_plan_sp->ValidatePlan (error);
|
|
else if (m_step_through_inline_plan_sp)
|
|
return m_step_through_inline_plan_sp->ValidatePlan (error);
|
|
else if (m_return_bp_id == LLDB_INVALID_BREAK_ID)
|
|
{
|
|
if (error)
|
|
error->PutCString("Could not create return address breakpoint.");
|
|
return false;
|
|
}
|
|
else
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
ThreadPlanStepOut::DoPlanExplainsStop (Event *event_ptr)
|
|
{
|
|
// If the step out plan is done, then we just need to step through the inlined frame.
|
|
if (m_step_out_to_inline_plan_sp)
|
|
{
|
|
if (m_step_out_to_inline_plan_sp->MischiefManaged())
|
|
return true;
|
|
else
|
|
return false;
|
|
}
|
|
else if (m_step_through_inline_plan_sp)
|
|
{
|
|
if (m_step_through_inline_plan_sp->MischiefManaged())
|
|
{
|
|
CalculateReturnValue();
|
|
SetPlanComplete();
|
|
return true;
|
|
}
|
|
else
|
|
return false;
|
|
}
|
|
else if (m_step_out_further_plan_sp)
|
|
{
|
|
if (m_step_out_further_plan_sp->MischiefManaged())
|
|
return true;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
// We don't explain signals or breakpoints (breakpoints that handle stepping in or
|
|
// out will be handled by a child plan.
|
|
|
|
StopInfoSP stop_info_sp = GetPrivateStopInfo ();
|
|
if (stop_info_sp)
|
|
{
|
|
StopReason reason = stop_info_sp->GetStopReason();
|
|
switch (reason)
|
|
{
|
|
case eStopReasonBreakpoint:
|
|
{
|
|
// If this is OUR breakpoint, we're fine, otherwise we don't know why this happened...
|
|
BreakpointSiteSP site_sp (m_thread.GetProcess()->GetBreakpointSiteList().FindByID (stop_info_sp->GetValue()));
|
|
if (site_sp && site_sp->IsBreakpointAtThisSite (m_return_bp_id))
|
|
{
|
|
bool done;
|
|
|
|
StackID frame_zero_id = m_thread.GetStackFrameAtIndex(0)->GetStackID();
|
|
|
|
if (m_step_out_to_id == frame_zero_id)
|
|
done = true;
|
|
else if (m_step_out_to_id < frame_zero_id)
|
|
{
|
|
// Either we stepped past the breakpoint, or the stack ID calculation
|
|
// was incorrect and we should probably stop.
|
|
done = true;
|
|
}
|
|
else
|
|
{
|
|
if (m_immediate_step_from_id < frame_zero_id)
|
|
done = true;
|
|
else
|
|
done = false;
|
|
}
|
|
|
|
if (done)
|
|
{
|
|
if (InvokeShouldStopHereCallback (eFrameCompareOlder))
|
|
{
|
|
CalculateReturnValue();
|
|
SetPlanComplete();
|
|
}
|
|
}
|
|
|
|
// If there was only one owner, then we're done. But if we also hit some
|
|
// user breakpoint on our way out, we should mark ourselves as done, but
|
|
// also not claim to explain the stop, since it is more important to report
|
|
// the user breakpoint than the step out completion.
|
|
|
|
if (site_sp->GetNumberOfOwners() == 1)
|
|
return true;
|
|
|
|
}
|
|
return false;
|
|
}
|
|
case eStopReasonWatchpoint:
|
|
case eStopReasonSignal:
|
|
case eStopReasonException:
|
|
case eStopReasonExec:
|
|
case eStopReasonThreadExiting:
|
|
return false;
|
|
|
|
default:
|
|
return true;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
ThreadPlanStepOut::ShouldStop (Event *event_ptr)
|
|
{
|
|
if (IsPlanComplete())
|
|
return true;
|
|
|
|
bool done = false;
|
|
if (m_step_out_to_inline_plan_sp)
|
|
{
|
|
if (m_step_out_to_inline_plan_sp->MischiefManaged())
|
|
{
|
|
// Now step through the inlined stack we are in:
|
|
if (QueueInlinedStepPlan(true))
|
|
{
|
|
// If we can't queue a plan to do this, then just call ourselves done.
|
|
m_step_out_to_inline_plan_sp.reset();
|
|
SetPlanComplete (false);
|
|
return true;
|
|
}
|
|
else
|
|
done = true;
|
|
}
|
|
else
|
|
return m_step_out_to_inline_plan_sp->ShouldStop(event_ptr);
|
|
}
|
|
else if (m_step_through_inline_plan_sp)
|
|
{
|
|
if (m_step_through_inline_plan_sp->MischiefManaged())
|
|
done = true;
|
|
else
|
|
return m_step_through_inline_plan_sp->ShouldStop(event_ptr);
|
|
}
|
|
else if (m_step_out_further_plan_sp)
|
|
{
|
|
if (m_step_out_further_plan_sp->MischiefManaged())
|
|
m_step_out_further_plan_sp.reset();
|
|
else
|
|
return m_step_out_further_plan_sp->ShouldStop(event_ptr);
|
|
}
|
|
|
|
if (!done)
|
|
{
|
|
StackID frame_zero_id = m_thread.GetStackFrameAtIndex(0)->GetStackID();
|
|
if (frame_zero_id < m_step_out_to_id)
|
|
done = false;
|
|
else
|
|
done = true;
|
|
}
|
|
|
|
// The normal step out computations think we are done, so all we need to do is consult the ShouldStopHere,
|
|
// and we are done.
|
|
|
|
if (done)
|
|
{
|
|
if (InvokeShouldStopHereCallback(eFrameCompareOlder))
|
|
{
|
|
CalculateReturnValue();
|
|
SetPlanComplete();
|
|
}
|
|
else
|
|
{
|
|
m_step_out_further_plan_sp = QueueStepOutFromHerePlan(m_flags, eFrameCompareOlder);
|
|
done = false;
|
|
}
|
|
}
|
|
|
|
return done;
|
|
}
|
|
|
|
bool
|
|
ThreadPlanStepOut::StopOthers ()
|
|
{
|
|
return m_stop_others;
|
|
}
|
|
|
|
StateType
|
|
ThreadPlanStepOut::GetPlanRunState ()
|
|
{
|
|
return eStateRunning;
|
|
}
|
|
|
|
bool
|
|
ThreadPlanStepOut::DoWillResume (StateType resume_state, bool current_plan)
|
|
{
|
|
if (m_step_out_to_inline_plan_sp || m_step_through_inline_plan_sp)
|
|
return true;
|
|
|
|
if (m_return_bp_id == LLDB_INVALID_BREAK_ID)
|
|
return false;
|
|
|
|
if (current_plan)
|
|
{
|
|
Breakpoint *return_bp = m_thread.CalculateTarget()->GetBreakpointByID(m_return_bp_id).get();
|
|
if (return_bp != NULL)
|
|
return_bp->SetEnabled (true);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
ThreadPlanStepOut::WillStop ()
|
|
{
|
|
if (m_return_bp_id != LLDB_INVALID_BREAK_ID)
|
|
{
|
|
Breakpoint *return_bp = m_thread.CalculateTarget()->GetBreakpointByID(m_return_bp_id).get();
|
|
if (return_bp != NULL)
|
|
return_bp->SetEnabled (false);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
ThreadPlanStepOut::MischiefManaged ()
|
|
{
|
|
if (IsPlanComplete())
|
|
{
|
|
// Did I reach my breakpoint? If so I'm done.
|
|
//
|
|
// I also check the stack depth, since if we've blown past the breakpoint for some
|
|
// reason and we're now stopping for some other reason altogether, then we're done
|
|
// with this step out operation.
|
|
|
|
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
|
|
if (log)
|
|
log->Printf("Completed step out plan.");
|
|
if (m_return_bp_id != LLDB_INVALID_BREAK_ID)
|
|
{
|
|
m_thread.CalculateTarget()->RemoveBreakpointByID (m_return_bp_id);
|
|
m_return_bp_id = LLDB_INVALID_BREAK_ID;
|
|
}
|
|
|
|
ThreadPlan::MischiefManaged ();
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool
|
|
ThreadPlanStepOut::QueueInlinedStepPlan (bool queue_now)
|
|
{
|
|
// Now figure out the range of this inlined block, and set up a "step through range"
|
|
// plan for that. If we've been provided with a context, then use the block in that
|
|
// context.
|
|
StackFrameSP immediate_return_from_sp (m_thread.GetStackFrameAtIndex (0));
|
|
if (!immediate_return_from_sp)
|
|
return false;
|
|
|
|
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
|
|
if (log)
|
|
{
|
|
StreamString s;
|
|
immediate_return_from_sp->Dump(&s, true, false);
|
|
log->Printf("Queuing inlined frame to step past: %s.", s.GetData());
|
|
}
|
|
|
|
Block *from_block = immediate_return_from_sp->GetFrameBlock();
|
|
if (from_block)
|
|
{
|
|
Block *inlined_block = from_block->GetContainingInlinedBlock();
|
|
if (inlined_block)
|
|
{
|
|
size_t num_ranges = inlined_block->GetNumRanges();
|
|
AddressRange inline_range;
|
|
if (inlined_block->GetRangeAtIndex(0, inline_range))
|
|
{
|
|
SymbolContext inlined_sc;
|
|
inlined_block->CalculateSymbolContext(&inlined_sc);
|
|
inlined_sc.target_sp = GetTarget().shared_from_this();
|
|
RunMode run_mode = m_stop_others ? lldb::eOnlyThisThread : lldb::eAllThreads;
|
|
const LazyBool avoid_no_debug = eLazyBoolNo;
|
|
ThreadPlanStepOverRange *step_through_inline_plan_ptr = new ThreadPlanStepOverRange(m_thread,
|
|
inline_range,
|
|
inlined_sc,
|
|
run_mode,
|
|
avoid_no_debug);
|
|
step_through_inline_plan_ptr->SetOkayToDiscard(true);
|
|
StreamString errors;
|
|
if (!step_through_inline_plan_ptr->ValidatePlan(&errors))
|
|
{
|
|
//FIXME: Log this failure.
|
|
delete step_through_inline_plan_ptr;
|
|
return false;
|
|
}
|
|
|
|
for (size_t i = 1; i < num_ranges; i++)
|
|
{
|
|
if (inlined_block->GetRangeAtIndex (i, inline_range))
|
|
step_through_inline_plan_ptr->AddRange (inline_range);
|
|
}
|
|
m_step_through_inline_plan_sp.reset (step_through_inline_plan_ptr);
|
|
if (queue_now)
|
|
m_thread.QueueThreadPlan (m_step_through_inline_plan_sp, false);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
ThreadPlanStepOut::CalculateReturnValue ()
|
|
{
|
|
if (m_return_valobj_sp)
|
|
return;
|
|
|
|
if (m_immediate_step_from_function != NULL)
|
|
{
|
|
ClangASTType return_clang_type = m_immediate_step_from_function->GetClangType().GetFunctionReturnType();
|
|
if (return_clang_type)
|
|
{
|
|
lldb::ABISP abi_sp = m_thread.GetProcess()->GetABI();
|
|
if (abi_sp)
|
|
m_return_valobj_sp = abi_sp->GetReturnValueObject(m_thread, return_clang_type);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool
|
|
ThreadPlanStepOut::IsPlanStale()
|
|
{
|
|
// If we are still lower on the stack than the frame we are returning to, then
|
|
// there's something for us to do. Otherwise, we're stale.
|
|
|
|
StackID frame_zero_id = m_thread.GetStackFrameAtIndex(0)->GetStackID();
|
|
if (frame_zero_id < m_step_out_to_id)
|
|
return false;
|
|
else
|
|
return true;
|
|
}
|