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pythonnet/src/runtime/runtime_state.cs at master · sdpython/pythonnet · GitHub
This repository was archived by the owner on Jul 22, 2023. It is now read-only.
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using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Diagnostics
;
using
System
.
Runtime
.
InteropServices
;
using
static
Python
.
Runtime
.
Runtime
;
namespace
Python
.
Runtime
{
class
RuntimeState
{
public
static
bool
ShouldRestoreObjects
{
get
;
set
;
}
=
false
;
public
static
bool
UseDummyGC
{
get
;
set
;
}
=
false
;
public
static
void
Save
(
)
{
if
(
!
PySys_GetObject
(
"dummy_gc"
)
.
IsNull
)
{
throw
new
Exception
(
"Runtime State set already"
)
;
}
IntPtr
objs
=
IntPtr
.
Zero
;
if
(
ShouldRestoreObjects
)
{
objs
=
PySet_New
(
IntPtr
.
Zero
)
;
foreach
(
var
obj
in
PyGCGetObjects
(
)
)
{
AddObjPtrToSet
(
objs
,
obj
)
;
}
}
var
modules
=
PySet_New
(
IntPtr
.
Zero
)
;
foreach
(
var
name
in
GetModuleNames
(
)
)
{
int
res
=
PySet_Add
(
modules
,
name
)
;
PythonException
.
ThrowIfIsNotZero
(
res
)
;
}
var
dummyGCHead
=
PyMem_Malloc
(
Marshal
.
SizeOf
(
typeof
(
PyGC_Head
)
)
)
;
unsafe
{
var
head
=
(
PyGC_Head
*
)
dummyGCHead
;
head
->
gc
.
gc_next
=
dummyGCHead
;
head
->
gc
.
gc_prev
=
dummyGCHead
;
head
->
gc
.
gc_refs
=
IntPtr
.
Zero
;
}
{
var
pyDummyGC
=
PyLong_FromVoidPtr
(
dummyGCHead
)
;
int
res
=
PySys_SetObject
(
"dummy_gc"
,
pyDummyGC
)
;
PythonException
.
ThrowIfIsNotZero
(
res
)
;
XDecref
(
pyDummyGC
)
;
try
{
res
=
PySys_SetObject
(
"initial_modules"
,
modules
)
;
PythonException
.
ThrowIfIsNotZero
(
res
)
;
}
finally
{
XDecref
(
modules
)
;
}
if
(
ShouldRestoreObjects
)
{
AddObjPtrToSet
(
objs
,
modules
)
;
try
{
res
=
PySys_SetObject
(
"initial_objs"
,
objs
)
;
PythonException
.
ThrowIfIsNotZero
(
res
)
;
}
finally
{
XDecref
(
objs
)
;
}
}
}
}
public
static
void
Restore
(
)
{
var
dummyGCAddr
=
PySys_GetObject
(
"dummy_gc"
)
.
DangerousGetAddress
(
)
;
if
(
dummyGCAddr
==
IntPtr
.
Zero
)
{
throw
new
InvalidOperationException
(
"Runtime state have not set"
)
;
}
var
dummyGC
=
PyLong_AsVoidPtr
(
dummyGCAddr
)
;
ResotreModules
(
dummyGC
)
;
if
(
ShouldRestoreObjects
)
{
RestoreObjects
(
dummyGC
)
;
}
}
private
static
void
ResotreModules
(
IntPtr
dummyGC
)
{
var
intialModules
=
PySys_GetObject
(
"initial_modules"
)
;
Debug
.
Assert
(
!
intialModules
.
IsNull
)
;
var
modules
=
PyImport_GetModuleDict
(
)
;
foreach
(
var
name
in
GetModuleNames
(
)
)
{
if
(
PySet_Contains
(
intialModules
.
DangerousGetAddress
(
)
,
name
)
==
1
)
{
continue
;
}
var
module
=
PyDict_GetItem
(
modules
,
name
)
;
if
(
UseDummyGC
&&
_PyObject_GC_IS_TRACKED
(
module
)
)
{
ExchangeGCChain
(
module
,
dummyGC
)
;
}
if
(
PyDict_DelItem
(
modules
,
name
)
!=
0
)
{
PyErr_Print
(
)
;
}
}
}
private
static
void
RestoreObjects
(
IntPtr
dummyGC
)
{
if
(
!
UseDummyGC
)
{
throw
new
Exception
(
"To prevent crash by _PyObject_GC_UNTRACK in Python internal, UseDummyGC should be enabled when using ResotreObjects"
)
;
}
IntPtr
intialObjs
=
PySys_GetObject
(
"initial_objs"
)
.
DangerousGetAddress
(
)
;
Debug
.
Assert
(
intialObjs
!=
IntPtr
.
Zero
)
;
foreach
(
var
obj
in
PyGCGetObjects
(
)
)
{
var
p
=
PyLong_FromVoidPtr
(
obj
)
;
try
{
if
(
PySet_Contains
(
intialObjs
,
p
)
==
1
)
{
continue
;
}
}
finally
{
XDecref
(
p
)
;
}
Debug
.
Assert
(
_PyObject_GC_IS_TRACKED
(
obj
)
,
"A GC object must be tracked"
)
;
ExchangeGCChain
(
obj
,
dummyGC
)
;
}
}
public
static
IEnumerable
<
IntPtr
>
PyGCGetObjects
(
)
{
var
gc
=
PyImport_ImportModule
(
"gc"
)
;
PythonException
.
ThrowIfIsNull
(
gc
)
;
var
get_objects
=
PyObject_GetAttrString
(
gc
,
"get_objects"
)
;
var
objs
=
PyObject_CallObject
(
get_objects
,
IntPtr
.
Zero
)
;
var
length
=
PyList_Size
(
new
BorrowedReference
(
objs
)
)
;
for
(
long
i
=
0
;
i
<
length
;
i
++
)
{
var
obj
=
PyList_GetItem
(
new
BorrowedReference
(
objs
)
,
i
)
;
yield
return
obj
.
DangerousGetAddress
(
)
;
}
XDecref
(
objs
)
;
XDecref
(
gc
)
;
}
public
static
IEnumerable
<
IntPtr
>
GetModuleNames
(
)
{
var
modules
=
PyImport_GetModuleDict
(
)
;
var
names
=
PyDict_Keys
(
modules
)
;
var
length
=
PyList_Size
(
new
BorrowedReference
(
names
)
)
;
for
(
int
i
=
0
;
i
<
length
;
i
++
)
{
var
name
=
PyList_GetItem
(
new
BorrowedReference
(
names
)
,
i
)
;
yield
return
name
.
DangerousGetAddress
(
)
;
}
XDecref
(
names
)
;
}
private
static
void
AddObjPtrToSet
(
IntPtr
set
,
IntPtr
obj
)
{
var
p
=
PyLong_FromVoidPtr
(
obj
)
;
XIncref
(
obj
)
;
try
{
int
res
=
PySet_Add
(
set
,
p
)
;
PythonException
.
ThrowIfIsNotZero
(
res
)
;
}
finally
{
XDecref
(
p
)
;
}
}
/// <summary>
/// Exchange gc to a dummy gc prevent nullptr error in _PyObject_GC_UnTrack macro.
/// </summary>
private
static
void
ExchangeGCChain
(
IntPtr
obj
,
IntPtr
gc
)
{
var
head
=
_Py_AS_GC
(
obj
)
;
if
(
(
long
)
_PyGCHead_REFS
(
head
)
==
_PyGC_REFS_UNTRACKED
)
{
throw
new
ArgumentException
(
"GC object untracked"
)
;
}
unsafe
{
var
g
=
(
PyGC_Head
*
)
head
;
var
newGCGen
=
(
PyGC_Head
*
)
gc
;
(
(
PyGC_Head
*
)
g
->
gc
.
gc_prev
)
->
gc
.
gc_next
=
g
->
gc
.
gc_next
;
(
(
PyGC_Head
*
)
g
->
gc
.
gc_next
)
->
gc
.
gc_prev
=
g
->
gc
.
gc_prev
;
g
->
gc
.
gc_next
=
gc
;
g
->
gc
.
gc_prev
=
newGCGen
->
gc
.
gc_prev
;
(
(
PyGC_Head
*
)
g
->
gc
.
gc_prev
)
->
gc
.
gc_next
=
head
;
newGCGen
->
gc
.
gc_prev
=
head
;
}
}
private
static
IEnumerable
<
IntPtr
>
IterGCNodes
(
IntPtr
gc
)
{
var
node
=
GetNextGCNode
(
gc
)
;
while
(
node
!=
gc
)
{
var
next
=
GetNextGCNode
(
node
)
;
yield
return
node
;
node
=
next
;
}
}
private
static
IEnumerable
<
IntPtr
>
IterObjects
(
IntPtr
gc
)
{
foreach
(
var
node
in
IterGCNodes
(
gc
)
)
{
yield
return
_Py_FROM_GC
(
node
)
;
}
}
private
static
unsafe
IntPtr
GetNextGCNode
(
IntPtr
node
)
{
return
(
(
PyGC_Head
*
)
node
)
->
gc
.
gc_next
;
}
}
}
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