1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
//===---------------------SharingPtr.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/Utility/SharingPtr.h"
#if defined(ENABLE_SP_LOGGING)
// If ENABLE_SP_LOGGING is defined, then log all shared pointer assignments and
// allow them to be queried using a pointer by a call to:
#include <assert.h>
#include <execinfo.h>
#include "llvm/ADT/STLExtras.h"
#include <map>
#include <mutex>
#include <vector>
class Backtrace {
public:
Backtrace();
~Backtrace();
void GetFrames();
void Dump() const;
private:
void *m_sp_this;
std::vector<void *> m_frames;
};
Backtrace::Backtrace() : m_frames() {}
Backtrace::~Backtrace() {}
void Backtrace::GetFrames() {
void *frames[1024];
const int count = ::backtrace(frames, llvm::array_lengthof(frames));
if (count > 2)
m_frames.assign(frames + 2, frames + (count - 2));
}
void Backtrace::Dump() const {
if (!m_frames.empty())
::backtrace_symbols_fd(m_frames.data(), m_frames.size(), STDOUT_FILENO);
write(STDOUT_FILENO, "\n\n", 2);
}
extern "C" void track_sp(void *sp_this, void *ptr, long use_count) {
typedef std::pair<void *, Backtrace> PtrBacktracePair;
typedef std::map<void *, PtrBacktracePair> PtrToBacktraceMap;
static std::mutex g_mutex;
std::lock_guard<std::mutex> guard(g_mutex);
static PtrToBacktraceMap g_map;
if (sp_this) {
printf("sp(%p) -> %p %lu\n", sp_this, ptr, use_count);
if (ptr) {
Backtrace bt;
bt.GetFrames();
g_map[sp_this] = std::make_pair(ptr, bt);
} else {
g_map.erase(sp_this);
}
} else {
if (ptr)
printf("Searching for shared pointers that are tracking %p: ", ptr);
else
printf("Dump all live shared pointres: ");
uint32_t matches = 0;
PtrToBacktraceMap::iterator pos, end = g_map.end();
for (pos = g_map.begin(); pos != end; ++pos) {
if (ptr == NULL || pos->second.first == ptr) {
++matches;
printf("\nsp(%p): %p\n", pos->first, pos->second.first);
pos->second.second.Dump();
}
}
if (matches == 0) {
printf("none.\n");
}
}
}
// Put dump_sp_refs in the lldb namespace to it gets through our exports lists
// filter in the LLDB.framework or lldb.so
namespace lldb {
void dump_sp_refs(void *ptr) {
// Use a specially crafted call to "track_sp" which will dump info on all
// live shared pointers that reference "ptr"
track_sp(NULL, ptr, 0);
}
}
#endif
namespace lldb_private {
namespace imp {
shared_count::~shared_count() {}
void shared_count::add_shared() {
#ifdef _MSC_VER
_InterlockedIncrement(&shared_owners_);
#else
++shared_owners_;
#endif
}
void shared_count::release_shared() {
#ifdef _MSC_VER
if (_InterlockedDecrement(&shared_owners_) == -1)
#else
if (--shared_owners_ == -1)
#endif
{
on_zero_shared();
delete this;
}
}
} // imp
} // namespace lldb
|
