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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
#include "Python.h"
#include "pycore_object.h"
#include "pycore_stackref.h"
#if !defined(Py_GIL_DISABLED) && defined(Py_STACKREF_DEBUG)
#if SIZEOF_VOID_P < 8
#error "Py_STACKREF_DEBUG requires 64 bit machine"
#endif
#include "pycore_interp.h"
#include "pycore_hashtable.h"
typedef struct _table_entry {
PyObject *obj;
const char *classname;
const char *filename;
int linenumber;
const char *filename_borrow;
int linenumber_borrow;
} TableEntry;
TableEntry *
make_table_entry(PyObject *obj, const char *filename, int linenumber)
{
TableEntry *result = malloc(sizeof(TableEntry));
if (result == NULL) {
return NULL;
}
result->obj = obj;
result->classname = Py_TYPE(obj)->tp_name;
result->filename = filename;
result->linenumber = linenumber;
result->filename_borrow = NULL;
return result;
}
PyObject *
_Py_stackref_get_object(_PyStackRef ref)
{
if (ref.index == 0) {
return NULL;
}
PyInterpreterState *interp = PyInterpreterState_Get();
assert(interp != NULL);
if (ref.index >= interp->next_stackref) {
_Py_FatalErrorFormat(__func__, "Garbled stack ref with ID %" PRIu64 "\n", ref.index);
}
TableEntry *entry = _Py_hashtable_get(interp->open_stackrefs_table, (void *)ref.index);
if (entry == NULL) {
_Py_FatalErrorFormat(__func__, "Accessing closed stack ref with ID %" PRIu64 "\n", ref.index);
}
return entry->obj;
}
int
PyStackRef_Is(_PyStackRef a, _PyStackRef b)
{
return _Py_stackref_get_object(a) == _Py_stackref_get_object(b);
}
PyObject *
_Py_stackref_close(_PyStackRef ref, const char *filename, int linenumber)
{
PyInterpreterState *interp = PyInterpreterState_Get();
if (ref.index >= interp->next_stackref) {
_Py_FatalErrorFormat(__func__, "Invalid StackRef with ID %" PRIu64 " at %s:%d\n", (void *)ref.index, filename, linenumber);
}
PyObject *obj;
if (ref.index <= LAST_PREDEFINED_STACKREF_INDEX) {
if (ref.index == 0) {
_Py_FatalErrorFormat(__func__, "Passing NULL to PyStackRef_CLOSE at %s:%d\n", filename, linenumber);
}
// Pre-allocated reference to None, False or True -- Do not clear
TableEntry *entry = _Py_hashtable_get(interp->open_stackrefs_table, (void *)ref.index);
obj = entry->obj;
}
else {
TableEntry *entry = _Py_hashtable_steal(interp->open_stackrefs_table, (void *)ref.index);
if (entry == NULL) {
#ifdef Py_STACKREF_CLOSE_DEBUG
entry = _Py_hashtable_get(interp->closed_stackrefs_table, (void *)ref.index);
if (entry != NULL) {
_Py_FatalErrorFormat(__func__,
"Double close of ref ID %" PRIu64 " at %s:%d. Referred to instance of %s at %p. Closed at %s:%d\n",
(void *)ref.index, filename, linenumber, entry->classname, entry->obj, entry->filename, entry->linenumber);
}
#endif
_Py_FatalErrorFormat(__func__, "Invalid StackRef with ID %" PRIu64 "\n", (void *)ref.index);
}
obj = entry->obj;
free(entry);
#ifdef Py_STACKREF_CLOSE_DEBUG
TableEntry *close_entry = make_table_entry(obj, filename, linenumber);
if (close_entry == NULL) {
Py_FatalError("No memory left for stackref debug table");
}
if (_Py_hashtable_set(interp->closed_stackrefs_table, (void *)ref.index, close_entry) < 0) {
Py_FatalError("No memory left for stackref debug table");
}
#endif
}
return obj;
}
_PyStackRef
_Py_stackref_create(PyObject *obj, const char *filename, int linenumber)
{
if (obj == NULL) {
Py_FatalError("Cannot create a stackref for NULL");
}
PyInterpreterState *interp = PyInterpreterState_Get();
uint64_t new_id = interp->next_stackref++;
TableEntry *entry = make_table_entry(obj, filename, linenumber);
if (entry == NULL) {
Py_FatalError("No memory left for stackref debug table");
}
if (_Py_hashtable_set(interp->open_stackrefs_table, (void *)new_id, entry) < 0) {
Py_FatalError("No memory left for stackref debug table");
}
return (_PyStackRef){ .index = new_id };
}
void
_Py_stackref_record_borrow(_PyStackRef ref, const char *filename, int linenumber)
{
if (ref.index <= LAST_PREDEFINED_STACKREF_INDEX) {
return;
}
PyInterpreterState *interp = PyInterpreterState_Get();
TableEntry *entry = _Py_hashtable_get(interp->open_stackrefs_table, (void *)ref.index);
if (entry == NULL) {
#ifdef Py_STACKREF_CLOSE_DEBUG
entry = _Py_hashtable_get(interp->closed_stackrefs_table, (void *)ref.index);
if (entry != NULL) {
_Py_FatalErrorFormat(__func__,
"Borrow of closed ref ID %" PRIu64 " at %s:%d. Referred to instance of %s at %p. Closed at %s:%d\n",
(void *)ref.index, filename, linenumber, entry->classname, entry->obj, entry->filename, entry->linenumber);
}
#endif
_Py_FatalErrorFormat(__func__, "Invalid StackRef with ID %" PRIu64 " at %s:%d\n", (void *)ref.index, filename, linenumber);
}
entry->filename_borrow = filename;
entry->linenumber_borrow = linenumber;
}
void
_Py_stackref_associate(PyInterpreterState *interp, PyObject *obj, _PyStackRef ref)
{
assert(interp->next_stackref >= ref.index);
interp->next_stackref = ref.index+1;
TableEntry *entry = make_table_entry(obj, "builtin-object", 0);
if (entry == NULL) {
Py_FatalError("No memory left for stackref debug table");
}
if (_Py_hashtable_set(interp->open_stackrefs_table, (void *)ref.index, (void *)entry) < 0) {
Py_FatalError("No memory left for stackref debug table");
}
}
static int
report_leak(_Py_hashtable_t *ht, const void *key, const void *value, void *leak)
{
TableEntry *entry = (TableEntry *)value;
if (!_Py_IsStaticImmortal(entry->obj)) {
*(int *)leak = 1;
printf("Stackref leak. Refers to instance of %s at %p. Created at %s:%d",
entry->classname, entry->obj, entry->filename, entry->linenumber);
if (entry->filename_borrow != NULL) {
printf(". Last borrow at %s:%d",entry->filename_borrow, entry->linenumber_borrow);
}
printf("\n");
}
return 0;
}
void
_Py_stackref_report_leaks(PyInterpreterState *interp)
{
int leak = 0;
_Py_hashtable_foreach(interp->open_stackrefs_table, report_leak, &leak);
if (leak) {
fflush(stdout);
Py_FatalError("Stackrefs leaked.");
}
}
void
_PyStackRef_CLOSE_SPECIALIZED(_PyStackRef ref, destructor destruct, const char *filename, int linenumber)
{
PyObject *obj = _Py_stackref_close(ref, filename, linenumber);
_Py_DECREF_SPECIALIZED(obj, destruct);
}
#endif
|
