Repository navigation
Expand file tree
/
Copy pathtypemanager.cs
More file actions
828 lines (697 loc) · 31.4 KB
/
Copy pathtypemanager.cs
File metadata and controls
828 lines (697 loc) · 31.4 KB
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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.InteropServices;
using Python.Runtime.Platform;
namespace Python.Runtime
{
/// <summary>
/// The TypeManager class is responsible for building binary-compatible
/// Python type objects that are implemented in managed code.
/// </summary>
internal class TypeManager
{
private static BindingFlags tbFlags;
private static Dictionary<Type, IntPtr> cache;
static TypeManager()
{
tbFlags = BindingFlags.Public | BindingFlags.Static;
cache = new Dictionary<Type, IntPtr>(128);
}
public static void Reset()
{
cache = new Dictionary<Type, IntPtr>(128);
}
/// <summary>
/// Given a managed Type derived from ExtensionType, get the handle to
/// a Python type object that delegates its implementation to the Type
/// object. These Python type instances are used to implement internal
/// descriptor and utility types like ModuleObject, PropertyObject, etc.
/// </summary>
internal static IntPtr GetTypeHandle(Type type)
{
// Note that these types are cached with a refcount of 1, so they
// effectively exist until the CPython runtime is finalized.
IntPtr handle;
cache.TryGetValue(type, out handle);
if (handle != IntPtr.Zero)
{
return handle;
}
handle = CreateType(type);
cache[type] = handle;
return handle;
}
/// <summary>
/// Get the handle of a Python type that reflects the given CLR type.
/// The given ManagedType instance is a managed object that implements
/// the appropriate semantics in Python for the reflected managed type.
/// </summary>
internal static IntPtr GetTypeHandle(ManagedType obj, Type type)
{
IntPtr handle;
cache.TryGetValue(type, out handle);
if (handle != IntPtr.Zero)
{
return handle;
}
handle = CreateType(obj, type);
cache[type] = handle;
return handle;
}
/// <summary>
/// The following CreateType implementations do the necessary work to
/// create Python types to represent managed extension types, reflected
/// types, subclasses of reflected types and the managed metatype. The
/// dance is slightly different for each kind of type due to different
/// behavior needed and the desire to have the existing Python runtime
/// do as much of the allocation and initialization work as possible.
/// </summary>
internal static IntPtr CreateType(Type impl)
{
IntPtr type = AllocateTypeObject(impl.Name);
int ob_size = ObjectOffset.Size(type);
// Set tp_basicsize to the size of our managed instance objects.
Marshal.WriteIntPtr(type, TypeOffset.tp_basicsize, (IntPtr)ob_size);
var offset = (IntPtr)ObjectOffset.DictOffset(type);
Marshal.WriteIntPtr(type, TypeOffset.tp_dictoffset, offset);
InitializeSlots(type, impl);
int flags = TypeFlags.Default | TypeFlags.Managed |
TypeFlags.HeapType | TypeFlags.HaveGC;
Util.WriteCLong(type, TypeOffset.tp_flags, flags);
Runtime.PyType_Ready(type);
IntPtr dict = Marshal.ReadIntPtr(type, TypeOffset.tp_dict);
IntPtr mod = Runtime.PyString_FromString("CLR");
Runtime.PyDict_SetItemString(dict, "__module__", mod);
InitMethods(type, impl);
return type;
}
internal static IntPtr CreateType(ManagedType impl, Type clrType)
{
// Cleanup the type name to get rid of funny nested type names.
string name = "CLR." + clrType.FullName;
int i = name.LastIndexOf('+');
if (i > -1)
{
name = name.Substring(i + 1);
}
i = name.LastIndexOf('.');
if (i > -1)
{
name = name.Substring(i + 1);
}
IntPtr base_ = IntPtr.Zero;
int ob_size = ObjectOffset.Size(Runtime.PyTypeType);
int tp_dictoffset = ObjectOffset.DictOffset(Runtime.PyTypeType);
// XXX Hack, use a different base class for System.Exception
// Python 2.5+ allows new style class exceptions but they *must*
// subclass BaseException (or better Exception).
if (typeof(Exception).IsAssignableFrom(clrType))
{
ob_size = ObjectOffset.Size(Exceptions.Exception);
tp_dictoffset = ObjectOffset.DictOffset(Exceptions.Exception);
}
if (clrType == typeof(Exception))
{
base_ = Exceptions.Exception;
}
else if (clrType.BaseType != null)
{
ClassBase bc = ClassManager.GetClass(clrType.BaseType);
base_ = bc.pyHandle;
}
IntPtr type = AllocateTypeObject(name);
Marshal.WriteIntPtr(type, TypeOffset.ob_type, Runtime.PyCLRMetaType);
Runtime.XIncref(Runtime.PyCLRMetaType);
Marshal.WriteIntPtr(type, TypeOffset.tp_basicsize, (IntPtr)ob_size);
Marshal.WriteIntPtr(type, TypeOffset.tp_itemsize, IntPtr.Zero);
Marshal.WriteIntPtr(type, TypeOffset.tp_dictoffset, (IntPtr)tp_dictoffset);
InitializeSlots(type, impl.GetType());
if (base_ != IntPtr.Zero)
{
Marshal.WriteIntPtr(type, TypeOffset.tp_base, base_);
Runtime.XIncref(base_);
}
int flags = TypeFlags.Default;
flags |= TypeFlags.Managed;
flags |= TypeFlags.HeapType;
flags |= TypeFlags.BaseType;
flags |= TypeFlags.HaveGC;
Util.WriteCLong(type, TypeOffset.tp_flags, flags);
// Leverage followup initialization from the Python runtime. Note
// that the type of the new type must PyType_Type at the time we
// call this, else PyType_Ready will skip some slot initialization.
Runtime.PyType_Ready(type);
IntPtr dict = Marshal.ReadIntPtr(type, TypeOffset.tp_dict);
string mn = clrType.Namespace ?? "";
IntPtr mod = Runtime.PyString_FromString(mn);
Runtime.PyDict_SetItemString(dict, "__module__", mod);
// Hide the gchandle of the implementation in a magic type slot.
GCHandle gc = GCHandle.Alloc(impl);
Marshal.WriteIntPtr(type, TypeOffset.magic(), (IntPtr)gc);
// Set the handle attributes on the implementing instance.
impl.tpHandle = Runtime.PyCLRMetaType;
impl.gcHandle = gc;
impl.pyHandle = type;
//DebugUtil.DumpType(type);
return type;
}
internal static IntPtr CreateSubType(IntPtr py_name, IntPtr py_base_type, IntPtr py_dict)
{
// Utility to create a subtype of a managed type with the ability for the
// a python subtype able to override the managed implementation
string name = Runtime.GetManagedString(py_name);
// the derived class can have class attributes __assembly__ and __module__ which
// control the name of the assembly and module the new type is created in.
object assembly = null;
object namespaceStr = null;
var disposeList = new List<PyObject>();
try
{
var assemblyKey = new PyObject(Converter.ToPython("__assembly__", typeof(string)));
disposeList.Add(assemblyKey);
if (0 != Runtime.PyMapping_HasKey(py_dict, assemblyKey.Handle))
{
var pyAssembly = new PyObject(Runtime.PyDict_GetItem(py_dict, assemblyKey.Handle));
Runtime.XIncref(pyAssembly.Handle);
disposeList.Add(pyAssembly);
if (!Converter.ToManagedValue(pyAssembly.Handle, typeof(string), out assembly, false))
{
throw new InvalidCastException("Couldn't convert __assembly__ value to string");
}
}
var namespaceKey = new PyObject(Converter.ToPythonImplicit("__namespace__"));
disposeList.Add(namespaceKey);
if (0 != Runtime.PyMapping_HasKey(py_dict, namespaceKey.Handle))
{
var pyNamespace = new PyObject(Runtime.PyDict_GetItem(py_dict, namespaceKey.Handle));
Runtime.XIncref(pyNamespace.Handle);
disposeList.Add(pyNamespace);
if (!Converter.ToManagedValue(pyNamespace.Handle, typeof(string), out namespaceStr, false))
{
throw new InvalidCastException("Couldn't convert __namespace__ value to string");
}
}
}
finally
{
foreach (PyObject o in disposeList)
{
o.Dispose();
}
}
// create the new managed type subclassing the base managed type
var baseClass = ManagedType.GetManagedObject(py_base_type) as ClassBase;
if (null == baseClass)
{
return Exceptions.RaiseTypeError("invalid base class, expected CLR class type");
}
try
{
Type subType = ClassDerivedObject.CreateDerivedType(name,
baseClass.type,
py_dict,
(string)namespaceStr,
(string)assembly);
// create the new ManagedType and python type
ClassBase subClass = ClassManager.GetClass(subType);
IntPtr py_type = GetTypeHandle(subClass, subType);
// by default the class dict will have all the C# methods in it, but as this is a
// derived class we want the python overrides in there instead if they exist.
IntPtr cls_dict = Marshal.ReadIntPtr(py_type, TypeOffset.tp_dict);
Runtime.PyDict_Update(cls_dict, py_dict);
return py_type;
}
catch (Exception e)
{
return Exceptions.RaiseTypeError(e.Message);
}
}
internal static IntPtr WriteMethodDef(IntPtr mdef, IntPtr name, IntPtr func, int flags, IntPtr doc)
{
Marshal.WriteIntPtr(mdef, name);
Marshal.WriteIntPtr(mdef, 1 * IntPtr.Size, func);
Marshal.WriteInt32(mdef, 2 * IntPtr.Size, flags);
Marshal.WriteIntPtr(mdef, 3 * IntPtr.Size, doc);
return mdef + 4 * IntPtr.Size;
}
internal static IntPtr WriteMethodDef(IntPtr mdef, string name, IntPtr func, int flags = 0x0001,
string doc = null)
{
IntPtr namePtr = Marshal.StringToHGlobalAnsi(name);
IntPtr docPtr = doc != null ? Marshal.StringToHGlobalAnsi(doc) : IntPtr.Zero;
return WriteMethodDef(mdef, namePtr, func, flags, docPtr);
}
internal static IntPtr WriteMethodDefSentinel(IntPtr mdef)
{
return WriteMethodDef(mdef, IntPtr.Zero, IntPtr.Zero, 0, IntPtr.Zero);
}
internal static IntPtr CreateMetaType(Type impl)
{
// The managed metatype is functionally little different than the
// standard Python metatype (PyType_Type). It overrides certain of
// the standard type slots, and has to subclass PyType_Type for
// certain functions in the C runtime to work correctly with it.
IntPtr type = AllocateTypeObject("CLR Metatype");
IntPtr py_type = Runtime.PyTypeType;
Marshal.WriteIntPtr(type, TypeOffset.tp_base, py_type);
Runtime.XIncref(py_type);
// Copy gc and other type slots from the base Python metatype.
CopySlot(py_type, type, TypeOffset.tp_basicsize);
CopySlot(py_type, type, TypeOffset.tp_itemsize);
CopySlot(py_type, type, TypeOffset.tp_dictoffset);
CopySlot(py_type, type, TypeOffset.tp_weaklistoffset);
CopySlot(py_type, type, TypeOffset.tp_traverse);
CopySlot(py_type, type, TypeOffset.tp_clear);
CopySlot(py_type, type, TypeOffset.tp_is_gc);
// Override type slots with those of the managed implementation.
InitializeSlots(type, impl);
int flags = TypeFlags.Default;
flags |= TypeFlags.Managed;
flags |= TypeFlags.HeapType;
flags |= TypeFlags.HaveGC;
Util.WriteCLong(type, TypeOffset.tp_flags, flags);
// We need space for 3 PyMethodDef structs, each of them
// 4 int-ptrs in size.
IntPtr mdef = Runtime.PyMem_Malloc(3 * 4 * IntPtr.Size);
IntPtr mdefStart = mdef;
mdef = WriteMethodDef(
mdef,
"__instancecheck__",
Interop.GetThunk(typeof(MetaType).GetMethod("__instancecheck__"), "BinaryFunc")
);
mdef = WriteMethodDef(
mdef,
"__subclasscheck__",
Interop.GetThunk(typeof(MetaType).GetMethod("__subclasscheck__"), "BinaryFunc")
);
// FIXME: mdef is not used
mdef = WriteMethodDefSentinel(mdef);
Marshal.WriteIntPtr(type, TypeOffset.tp_methods, mdefStart);
Runtime.PyType_Ready(type);
IntPtr dict = Marshal.ReadIntPtr(type, TypeOffset.tp_dict);
IntPtr mod = Runtime.PyString_FromString("CLR");
Runtime.PyDict_SetItemString(dict, "__module__", mod);
//DebugUtil.DumpType(type);
return type;
}
internal static IntPtr BasicSubType(string name, IntPtr base_, Type impl)
{
// Utility to create a subtype of a std Python type, but with
// a managed type able to override implementation
IntPtr type = AllocateTypeObject(name);
//Marshal.WriteIntPtr(type, TypeOffset.tp_basicsize, (IntPtr)obSize);
//Marshal.WriteIntPtr(type, TypeOffset.tp_itemsize, IntPtr.Zero);
//IntPtr offset = (IntPtr)ObjectOffset.ob_dict;
//Marshal.WriteIntPtr(type, TypeOffset.tp_dictoffset, offset);
//IntPtr dc = Runtime.PyDict_Copy(dict);
//Marshal.WriteIntPtr(type, TypeOffset.tp_dict, dc);
Marshal.WriteIntPtr(type, TypeOffset.tp_base, base_);
Runtime.XIncref(base_);
int flags = TypeFlags.Default;
flags |= TypeFlags.Managed;
flags |= TypeFlags.HeapType;
flags |= TypeFlags.HaveGC;
Util.WriteCLong(type, TypeOffset.tp_flags, flags);
CopySlot(base_, type, TypeOffset.tp_traverse);
CopySlot(base_, type, TypeOffset.tp_clear);
CopySlot(base_, type, TypeOffset.tp_is_gc);
InitializeSlots(type, impl);
Runtime.PyType_Ready(type);
IntPtr tp_dict = Marshal.ReadIntPtr(type, TypeOffset.tp_dict);
IntPtr mod = Runtime.PyString_FromString("CLR");
Runtime.PyDict_SetItemString(tp_dict, "__module__", mod);
return type;
}
/// <summary>
/// Utility method to allocate a type object & do basic initialization.
/// </summary>
internal static IntPtr AllocateTypeObject(string name)
{
IntPtr type = Runtime.PyType_GenericAlloc(Runtime.PyTypeType, 0);
// Cheat a little: we'll set tp_name to the internal char * of
// the Python version of the type name - otherwise we'd have to
// allocate the tp_name and would have no way to free it.
#if PYTHON3
// For python3 we leak two objects. One for the ASCII representation
// required for tp_name, and another for the Unicode representation
// for ht_name.
IntPtr temp = Runtime.PyBytes_FromString(name);
IntPtr raw = Runtime.PyBytes_AS_STRING(temp);
temp = Runtime.PyUnicode_FromString(name);
#elif PYTHON2
IntPtr temp = Runtime.PyString_FromString(name);
IntPtr raw = Runtime.PyString_AsString(temp);
#endif
Marshal.WriteIntPtr(type, TypeOffset.tp_name, raw);
Marshal.WriteIntPtr(type, TypeOffset.name, temp);
#if PYTHON3
Marshal.WriteIntPtr(type, TypeOffset.qualname, temp);
#endif
long ptr = type.ToInt64(); // 64-bit safe
temp = new IntPtr(ptr + TypeOffset.nb_add);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_number, temp);
temp = new IntPtr(ptr + TypeOffset.sq_length);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_sequence, temp);
temp = new IntPtr(ptr + TypeOffset.mp_length);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_mapping, temp);
#if PYTHON3
temp = new IntPtr(ptr + TypeOffset.bf_getbuffer);
#elif PYTHON2
temp = new IntPtr(ptr + TypeOffset.bf_getreadbuffer);
#endif
Marshal.WriteIntPtr(type, TypeOffset.tp_as_buffer, temp);
return type;
}
#region Native Code Page
/// <summary>
/// Initialized by InitializeNativeCodePage.
///
/// This points to a page of memory allocated using mmap or VirtualAlloc
/// (depending on the system), and marked read and execute (not write).
/// Very much on purpose, the page is *not* released on a shutdown and
/// is instead leaked. See the TestDomainReload test case.
///
/// The contents of the page are two native functions: one that returns 0,
/// one that returns 1.
///
/// If python didn't keep its gc list through a Py_Finalize we could remove
/// this entire section.
/// </summary>
internal static IntPtr NativeCodePage = IntPtr.Zero;
/// <summary>
/// Structure to describe native code.
///
/// Use NativeCode.Active to get the native code for the current platform.
///
/// Generate the code by creating the following C code:
/// <code>
/// int Return0() { return 0; }
/// int Return1() { return 1; }
/// </code>
/// Then compiling on the target platform, e.g. with gcc or clang:
/// <code>cc -c -fomit-frame-pointer -O2 foo.c</code>
/// And then analyzing the resulting functions with a hex editor, e.g.:
/// <code>objdump -disassemble foo.o</code>
/// </summary>
internal class NativeCode
{
/// <summary>
/// The code, as a string of bytes.
/// </summary>
public byte[] Code { get; private set; }
/// <summary>
/// Where does the "return 0" function start?
/// </summary>
public int Return0 { get; private set; }
/// <summary>
/// Where does the "return 1" function start?
/// </summary>
public int Return1 { get; private set; }
public static NativeCode Active
{
get
{
switch (Runtime.Machine)
{
case MachineType.i386:
return I386;
case MachineType.x86_64:
return X86_64;
case MachineType.armv7l:
return Armv7l;
case MachineType.armv8:
return Armv8;
default:
throw new NotImplementedException($"No support for {Runtime.MachineName}");
}
}
}
/// <summary>
/// Code for x86_64. See the class comment for how it was generated.
/// </summary>
public static readonly NativeCode X86_64 = new NativeCode()
{
Return0 = 0x10,
Return1 = 0,
Code = new byte[]
{
// First Return1:
0xb8, 0x01, 0x00, 0x00, 0x00, // movl $1, %eax
0xc3, // ret
// Now some padding so that Return0 can be 16-byte-aligned.
// I put Return1 first so there's not as much padding to type in.
0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00, // nop
// Now Return0.
0x31, 0xc0, // xorl %eax, %eax
0xc3, // ret
}
};
/// <summary>
/// Code for X86.
///
/// It's bitwise identical to X86_64, so we just point to it.
/// <see cref="NativeCode.X86_64"/>
/// </summary>
public static readonly NativeCode I386 = X86_64;
public static readonly NativeCode Armv7l = new NativeCode()
{
Return0 = 0,
Return1 = 0x08,
Code = new byte[]
{
0xe3, 0xa0, 0x00, 0x00, // mov r0, #0
0xe1, 0x2f, 0xff, 0x1e, // bx lr
0xe3, 0xa0, 0x00, 0x01, // mov r0, #1
0xe1, 0x2f, 0xff, 0x1e, // bx lr
}
};
public static readonly NativeCode Armv8 = new NativeCode()
{
Return0 = 0,
Return1 = 0x08,
Code = new byte[]
{
0x52, 0x80, 0x00, 0x00, // mov w0, #0x0
0xd6, 0x5f, 0x03, 0xc0, // ret
0x52, 0x80, 0x00, 0x20, // mov w0, #0x1
0xd6, 0x5f, 0x03, 0xc0, // ret
}
};
}
/// <summary>
/// Platform-dependent mmap and mprotect.
/// </summary>
internal interface IMemoryMapper
{
/// <summary>
/// Map at least numBytes of memory. Mark the page read-write (but not exec).
/// </summary>
IntPtr MapWriteable(int numBytes);
/// <summary>
/// Sets the mapped memory to be read-exec (but not write).
/// </summary>
void SetReadExec(IntPtr mappedMemory, int numBytes);
}
class WindowsMemoryMapper : IMemoryMapper
{
const UInt32 MEM_COMMIT = 0x1000;
const UInt32 MEM_RESERVE = 0x2000;
const UInt32 PAGE_READWRITE = 0x04;
const UInt32 PAGE_EXECUTE_READ = 0x20;
[DllImport("kernel32.dll")]
static extern IntPtr VirtualAlloc(IntPtr lpAddress, IntPtr dwSize, UInt32 flAllocationType, UInt32 flProtect);
[DllImport("kernel32.dll")]
static extern bool VirtualProtect(IntPtr lpAddress, IntPtr dwSize, UInt32 flNewProtect, out UInt32 lpflOldProtect);
public IntPtr MapWriteable(int numBytes)
{
return VirtualAlloc(IntPtr.Zero, new IntPtr(numBytes),
MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
}
public void SetReadExec(IntPtr mappedMemory, int numBytes)
{
UInt32 _;
VirtualProtect(mappedMemory, new IntPtr(numBytes), PAGE_EXECUTE_READ, out _);
}
}
class UnixMemoryMapper : IMemoryMapper
{
const int PROT_READ = 0x1;
const int PROT_WRITE = 0x2;
const int PROT_EXEC = 0x4;
const int MAP_PRIVATE = 0x2;
int MAP_ANONYMOUS
{
get
{
switch (Runtime.OperatingSystem)
{
case OperatingSystemType.Darwin:
return 0x1000;
case OperatingSystemType.Linux:
return 0x20;
default:
throw new NotImplementedException($"mmap is not supported on {Runtime.OperatingSystemName}");
}
}
}
[DllImport("libc")]
static extern IntPtr mmap(IntPtr addr, IntPtr len, int prot, int flags, int fd, IntPtr offset);
[DllImport("libc")]
static extern int mprotect(IntPtr addr, IntPtr len, int prot);
public IntPtr MapWriteable(int numBytes)
{
// MAP_PRIVATE must be set on linux, even though MAP_ANON implies it.
// It doesn't hurt on darwin, so just do it.
return mmap(IntPtr.Zero, new IntPtr(numBytes), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, IntPtr.Zero);
}
public void SetReadExec(IntPtr mappedMemory, int numBytes)
{
mprotect(mappedMemory, new IntPtr(numBytes), PROT_READ | PROT_EXEC);
}
}
internal static IMemoryMapper CreateMemoryMapper()
{
switch (Runtime.OperatingSystem)
{
case OperatingSystemType.Darwin:
case OperatingSystemType.Linux:
return new UnixMemoryMapper();
case OperatingSystemType.Windows:
return new WindowsMemoryMapper();
default:
throw new NotImplementedException($"No support for {Runtime.OperatingSystemName}");
}
}
/// <summary>
/// Initializes the native code page.
///
/// Safe to call if we already initialized (this function is idempotent).
/// <see cref="NativeCodePage"/>
/// </summary>
internal static void InitializeNativeCodePage()
{
// Do nothing if we already initialized.
if (NativeCodePage != IntPtr.Zero)
{
return;
}
// Allocate the page, write the native code into it, then set it
// to be executable.
IMemoryMapper mapper = CreateMemoryMapper();
int codeLength = NativeCode.Active.Code.Length;
NativeCodePage = mapper.MapWriteable(codeLength);
Marshal.Copy(NativeCode.Active.Code, 0, NativeCodePage, codeLength);
mapper.SetReadExec(NativeCodePage, codeLength);
}
#endregion
/// <summary>
/// Given a newly allocated Python type object and a managed Type that
/// provides the implementation for the type, connect the type slots of
/// the Python object to the managed methods of the implementing Type.
/// </summary>
internal static void InitializeSlots(IntPtr type, Type impl)
{
// We work from the most-derived class up; make sure to get
// the most-derived slot and not to override it with a base
// class's slot.
var seen = new HashSet<string>();
while (impl != null)
{
MethodInfo[] methods = impl.GetMethods(tbFlags);
foreach (MethodInfo method in methods)
{
string name = method.Name;
if (!(name.StartsWith("tp_") ||
name.StartsWith("nb_") ||
name.StartsWith("sq_") ||
name.StartsWith("mp_") ||
name.StartsWith("bf_")
))
{
continue;
}
if (seen.Contains(name))
{
continue;
}
InitializeSlot(type, Interop.GetThunk(method), name);
seen.Add(name);
}
impl = impl.BaseType;
}
// See the TestDomainReload test: there was a crash related to
// the gc-related slots. They always return 0 or 1 because we don't
// really support gc:
// tp_traverse (returns 0)
// tp_clear (returns 0)
// tp_is_gc (returns 1)
// We can't do without: python really wants those slots to exist.
// We can't implement those in C# because the application domain
// can be shut down and the memory released.
InitializeNativeCodePage();
InitializeSlot(type, NativeCodePage + NativeCode.Active.Return0, "tp_traverse");
InitializeSlot(type, NativeCodePage + NativeCode.Active.Return0, "tp_clear");
InitializeSlot(type, NativeCodePage + NativeCode.Active.Return1, "tp_is_gc");
}
/// <summary>
/// Helper for InitializeSlots.
///
/// Initializes one slot to point to a function pointer.
/// The function pointer might be a thunk for C#, or it may be
/// an address in the NativeCodePage.
/// </summary>
/// <param name="type">Type being initialized.</param>
/// <param name="slot">Function pointer.</param>
/// <param name="name">Name of the method.</param>
static void InitializeSlot(IntPtr type, IntPtr slot, string name)
{
Type typeOffset = typeof(TypeOffset);
FieldInfo fi = typeOffset.GetField(name);
var offset = (int)fi.GetValue(typeOffset);
Marshal.WriteIntPtr(type, offset, slot);
}
/// <summary>
/// Given a newly allocated Python type object and a managed Type that
/// implements it, initialize any methods defined by the Type that need
/// to appear in the Python type __dict__ (based on custom attribute).
/// </summary>
private static void InitMethods(IntPtr pytype, Type type)
{
IntPtr dict = Marshal.ReadIntPtr(pytype, TypeOffset.tp_dict);
Type marker = typeof(PythonMethodAttribute);
BindingFlags flags = BindingFlags.Public | BindingFlags.Static;
var addedMethods = new HashSet<string>();
while (type != null)
{
MethodInfo[] methods = type.GetMethods(flags);
foreach (MethodInfo method in methods)
{
if (!addedMethods.Contains(method.Name))
{
object[] attrs = method.GetCustomAttributes(marker, false);
if (attrs.Length > 0)
{
string method_name = method.Name;
var mi = new MethodInfo[1];
mi[0] = method;
MethodObject m = new TypeMethod(type, method_name, mi);
Runtime.PyDict_SetItemString(dict, method_name, m.pyHandle);
addedMethods.Add(method_name);
}
}
}
type = type.BaseType;
}
}
/// <summary>
/// Utility method to copy slots from a given type to another type.
/// </summary>
internal static void CopySlot(IntPtr from, IntPtr to, int offset)
{
IntPtr fp = Marshal.ReadIntPtr(from, offset);
Marshal.WriteIntPtr(to, offset, fp);
}
}
}