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Copy pathruntime_state.cs
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238 lines (217 loc) · 7.56 KB
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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;
}
}
}