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57ee306789ba68992d537a65b3f107eadd18db2d
llvm/lldb/source/Target/ThreadPlanStepOut.cpp
Greg Clayton 57ee306789 Huge change to clean up types. 
A long time ago we start with clang types that were created by the symbol files and there were many functions in lldb_private::ClangASTContext that helped. Later we create ClangASTType which contains a clang::ASTContext and an opauque QualType, but we didn't switch over to fully using it. There were a lot of places where we would pass around a raw clang_type_t and also pass along a clang::ASTContext separately. This left room for error.

This checkin change all type code over to use ClangASTType everywhere and I cleaned up the interfaces quite a bit. Any code that was in ClangASTContext that was type related, was moved over into ClangASTType. All code that used these types was switched over to use all of the new goodness.

llvm-svn: 186130
2013-07-11 22:46:58 +00:00

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//===-- 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"
using namespace lldb;
using namespace lldb_private;
//----------------------------------------------------------------------
// 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
) :
ThreadPlan (ThreadPlan::eKindStepOut, "Step out", thread, stop_vote, run_vote),
m_step_from_context (context),
m_step_from_insn (LLDB_INVALID_ADDRESS),
m_return_bp_id (LLDB_INVALID_BREAK_ID),
m_return_addr (LLDB_INVALID_ADDRESS),
m_first_insn (first_insn),
m_stop_others (stop_others),
m_step_through_inline_plan_sp(),
m_step_out_plan_sp (),
m_immediate_step_from_function(NULL)
{
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_plan_sp.reset (new ThreadPlanStepOut(m_thread,
NULL,
false,
stop_others,
eVoteNoOpinion,
eVoteNoOpinion,
frame_idx - 1));
}
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).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::DidPush()
{
if (m_step_out_plan_sp)
m_thread.QueueThreadPlan(m_step_out_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_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_plan_sp)
return m_step_out_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 one of our child plans just finished, then we do explain the stop.
if (m_step_out_plan_sp)
{
if (m_step_out_plan_sp->MischiefManaged())
{
// If this one is done, then we are all done.
CalculateReturnValue();
SetPlanComplete();
return true;
}
else
return false;
}
else if (m_step_through_inline_plan_sp)
{
if (m_step_through_inline_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)
{
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;
StackID frame_zero_id = m_thread.GetStackFrameAtIndex(0)->GetStackID();
if (frame_zero_id < m_step_out_to_id)
done = false;
else
done = true;
if (done)
{
CalculateReturnValue();
SetPlanComplete();
return true;
}
else
{
if (m_step_out_plan_sp)
{
if (m_step_out_plan_sp->MischiefManaged())
{
// Now step through the inlined stack we are in:
if (QueueInlinedStepPlan(true))
{
return false;
}
else
{
CalculateReturnValue();
SetPlanComplete ();
return true;
}
}
else
return m_step_out_plan_sp->ShouldStop(event_ptr);
}
else if (m_step_through_inline_plan_sp)
{
if (m_step_through_inline_plan_sp->MischiefManaged())
{
// We don't calculate the return value here because we don't know how to.
// But in case we had a return value sitting around from our process in
// getting here, let's clear it out.
m_return_valobj_sp.reset();
SetPlanComplete();
return true;
}
else
return m_step_through_inline_plan_sp->ShouldStop(event_ptr);
}
else
return false;
}
}
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_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;
ThreadPlanStepOverRange *step_through_inline_plan_ptr = new ThreadPlanStepOverRange(m_thread,
inline_range,
inlined_sc,
run_mode);
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;
}
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