ThreadPlanStepOverRange.cpp revision 76e55f722acc41f6eaf35a7f988090f97b2c82e0 
1//===-- ThreadPlanStepOverRange.cpp -----------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "lldb/Target/ThreadPlanStepOverRange.h"
11
12// C Includes
13// C++ Includes
14// Other libraries and framework includes
15// Project includes
16
17#include "lldb/lldb-private-log.h"
18#include "lldb/Core/Log.h"
19#include "lldb/Core/Stream.h"
20#include "lldb/Target/Process.h"
21#include "lldb/Target/RegisterContext.h"
22#include "lldb/Target/Target.h"
23#include "lldb/Target/Thread.h"
24#include "lldb/Target/ThreadPlanStepOut.h"
25#include "lldb/Target/ThreadPlanStepThrough.h"
26
27using namespace lldb_private;
28using namespace lldb;
29
30
31//----------------------------------------------------------------------
32// ThreadPlanStepOverRange: Step through a stack range, either stepping over or into
33// based on the value of \a type.
34//----------------------------------------------------------------------
35
36ThreadPlanStepOverRange::ThreadPlanStepOverRange
37(
38    Thread &thread,
39    const AddressRange &range,
40    const SymbolContext &addr_context,
41    lldb::RunMode stop_others,
42    bool okay_to_discard
43) :
44    ThreadPlanStepRange (ThreadPlan::eKindStepOverRange, "Step range stepping over", thread, range, addr_context, stop_others)
45{
46    SetOkayToDiscard (okay_to_discard);
47}
48
49ThreadPlanStepOverRange::~ThreadPlanStepOverRange ()
50{
51}
52
53void
54ThreadPlanStepOverRange::GetDescription (Stream *s, lldb::DescriptionLevel level)
55{
56    if (level == lldb::eDescriptionLevelBrief)
57        s->Printf("step over");
58    else
59    {
60        s->Printf ("stepping through range (stepping over functions): ");
61        DumpRanges(s);
62    }
63}
64
65bool
66ThreadPlanStepOverRange::ShouldStop (Event *event_ptr)
67{
68    LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
69
70    if (log)
71    {
72        StreamString s;
73        s.Address (m_thread.GetRegisterContext()->GetPC(),
74                   m_thread.GetProcess().GetTarget().GetArchitecture().GetAddressByteSize());
75        log->Printf("ThreadPlanStepOverRange reached %s.", s.GetData());
76    }
77
78    // If we're still in the range, keep going.
79    if (InRange())
80        return false;
81
82    // If we're out of the range but in the same frame or in our caller's frame
83    // then we should stop.
84    // When stepping out we only step if we are forcing running one thread.
85    bool stop_others;
86    if (m_stop_others == lldb::eOnlyThisThread)
87        stop_others = true;
88    else
89        stop_others = false;
90
91    ThreadPlan* new_plan = NULL;
92
93    if (FrameIsOlder())
94    {
95        // If we're in an older frame then we should stop.
96        //
97        // A caveat to this is if we think the frame is older but we're actually in a trampoline.
98        // I'm going to make the assumption that you wouldn't RETURN to a trampoline.  So if we are
99        // in a trampoline we think the frame is older because the trampoline confused the backtracer.
100        // As below, we step through first, and then try to figure out how to get back out again.
101
102        new_plan = m_thread.QueueThreadPlanForStepThrough (false, stop_others);
103
104        if (new_plan != NULL && log)
105            log->Printf("Thought I stepped out, but in fact arrived at a trampoline.");
106    }
107    else if (FrameIsYounger())
108    {
109        new_plan = m_thread.QueueThreadPlanForStepOut (false,
110                                                       NULL,
111                                                       true,
112                                                       stop_others,
113                                                       eVoteNo,
114                                                       eVoteNoOpinion,
115                                                       0);
116    }
117    else if (!InSymbol())
118    {
119        // This one is a little tricky.  Sometimes we may be in a stub or something similar,
120        // in which case we need to get out of there.  But if we are in a stub then it's
121        // likely going to be hard to get out from here.  It is probably easiest to step into the
122        // stub, and then it will be straight-forward to step out.
123        new_plan = m_thread.QueueThreadPlanForStepThrough (false, stop_others);
124    }
125
126    if (new_plan == NULL)
127        m_no_more_plans = true;
128    else
129        m_no_more_plans = false;
130
131    if (new_plan == NULL)
132    {
133        // For efficiencies sake, we know we're done here so we don't have to do this
134        // calculation again in MischiefManaged.
135        SetPlanComplete();
136        return true;
137    }
138    else
139        return false;
140}
141