3 * Handle to object in native code
6 * - Ludovic Henry <ludovic@xamarin.com>
7 * - Aleksey Klieger <aleksey.klieger@xamarin.com>
8 * - Rodrigo Kumpera <kumpera@xamarin.com>
10 * Copyright 2016 Dot net foundation.
11 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
14 #ifndef __MONO_HANDLE_H__
15 #define __MONO_HANDLE_H__
20 #include <mono/metadata/object.h>
21 #include <mono/metadata/class.h>
22 #include <mono/utils/mono-error-internals.h>
23 #include <mono/utils/mono-threads.h>
24 #include <mono/utils/checked-build.h>
32 The handle stack is designed so it's efficient to pop a large amount of entries at once.
33 The stack is made out of a series of fixed size segments.
35 To do bulk operations you use a stack mark.
40 3 is the number of fields besides the data in the struct;
41 128 words makes each chunk 512 or 1024 bytes each
43 #define OBJECTS_PER_HANDLES_CHUNK (128 - 3)
46 Whether this config needs stack watermark recording to know where to start scanning from.
49 #define MONO_NEEDS_STACK_WATERMARK 1
52 typedef struct _HandleChunk HandleChunk;
54 /* define MONO_HANDLE_TRACK_OWNER to store the file and line number of each call to MONO_HANDLE_NEW
55 * in the handle stack. (This doubles the amount of memory used for handles, so it's only useful for debugging).
57 /* #define MONO_HANDLE_TRACK_OWNER */
60 gpointer o; /* MonoObject ptr or interior ptr */
61 #ifdef MONO_HANDLE_TRACK_OWNER
66 /* number of guint32's needed to store the interior pointers bitmap */
67 #define INTERIOR_HANDLE_BITMAP_WORDS ((OBJECTS_PER_HANDLES_CHUNK + 31) / 32)
70 int size; //number of handles
71 /* bits in the range 0..size-1 of interior_bitmap are valid; rest are ignored. */
72 guint32 interior_bitmap [INTERIOR_HANDLE_BITMAP_WORDS];
73 HandleChunk *prev, *next;
74 HandleChunkElem elems [OBJECTS_PER_HANDLES_CHUNK];
78 HandleChunk *top; //alloc from here
79 HandleChunk *bottom; //scan from here
87 typedef void *MonoRawHandle;
89 typedef void (*GcScanFunc) (gpointer*, gpointer);
92 #ifndef MONO_HANDLE_TRACK_OWNER
93 MonoRawHandle mono_handle_new (MonoObject *object);
94 MonoRawHandle mono_handle_new_full (gpointer rawptr, gboolean interior);
96 MonoRawHandle mono_handle_new (MonoObject *object, const char* owner);
97 MonoRawHandle mono_handle_new_full (gpointer rawptr, gboolean interior, const char *owner);
101 void mono_handle_stack_scan (HandleStack *stack, GcScanFunc func, gpointer gc_data, gboolean precise);
102 gboolean mono_handle_stack_is_empty (HandleStack *stack);
103 HandleStack* mono_handle_stack_alloc (void);
104 void mono_handle_stack_free (HandleStack *handlestack);
105 MonoRawHandle mono_stack_mark_pop_value (MonoThreadInfo *info, HandleStackMark *stackmark, MonoRawHandle value);
106 void mono_stack_mark_record_size (MonoThreadInfo *info, HandleStackMark *stackmark, const char *func_name);
109 mono_stack_mark_init (MonoThreadInfo *info, HandleStackMark *stackmark)
111 HandleStack *handles = (HandleStack *)info->handle_stack;
112 stackmark->size = handles->top->size;
113 stackmark->chunk = handles->top;
117 mono_stack_mark_pop (MonoThreadInfo *info, HandleStackMark *stackmark)
119 HandleStack *handles = (HandleStack *)info->handle_stack;
120 HandleChunk *old_top = stackmark->chunk;
121 old_top->size = stackmark->size;
122 mono_memory_write_barrier ();
123 handles->top = old_top;
129 #define SETUP_ICALL_COMMON \
132 MonoThreadInfo *__info = mono_thread_info_current (); \
133 error_init (&error); \
135 #define CLEAR_ICALL_COMMON \
136 mono_error_set_pending_exception (&error);
138 #define SETUP_ICALL_FRAME \
139 HandleStackMark __mark; \
140 mono_stack_mark_init (__info, &__mark);
142 #define CLEAR_ICALL_FRAME \
143 mono_stack_mark_record_size (__info, &__mark, __FUNCTION__); \
144 mono_stack_mark_pop (__info, &__mark);
146 #define CLEAR_ICALL_FRAME_VALUE(RESULT, HANDLE) \
147 mono_stack_mark_record_size (__info, &__mark, __FUNCTION__); \
148 (RESULT) = mono_stack_mark_pop_value (__info, &__mark, (HANDLE));
151 #define HANDLE_FUNCTION_ENTER() do { \
152 MonoThreadInfo *__info = mono_thread_info_current (); \
155 #define HANDLE_FUNCTION_RETURN() \
159 #define HANDLE_FUNCTION_RETURN_VAL(VAL) \
164 #define HANDLE_FUNCTION_RETURN_OBJ(HANDLE) \
166 void* __result = (MONO_HANDLE_RAW (HANDLE)); \
169 } while (0); } while (0);
171 #define HANDLE_FUNCTION_RETURN_REF(TYPE, HANDLE) \
173 MonoRawHandle __result; \
174 CLEAR_ICALL_FRAME_VALUE (__result, ((MonoRawHandle) (HANDLE))); \
175 return MONO_HANDLE_CAST (TYPE, __result); \
176 } while (0); } while (0);
178 #ifdef MONO_NEEDS_STACK_WATERMARK
181 mono_thread_info_pop_stack_mark (MonoThreadInfo *info, void *old_mark)
183 info->stack_mark = old_mark;
187 mono_thread_info_push_stack_mark (MonoThreadInfo *info, void *mark)
189 void *old = info->stack_mark;
190 info->stack_mark = mark;
194 #define SETUP_STACK_WATERMARK \
196 __builtin_unwind_init (); \
197 void *__old_stack_mark = mono_thread_info_push_stack_mark (__info, &__dummy);
199 #define CLEAR_STACK_WATERMARK \
200 mono_thread_info_pop_stack_mark (__info, __old_stack_mark);
203 #define SETUP_STACK_WATERMARK
204 #define CLEAR_STACK_WATERMARK
207 #define ICALL_ENTRY() \
210 SETUP_STACK_WATERMARK
212 #define ICALL_RETURN() \
214 CLEAR_STACK_WATERMARK \
218 } while (0); } while (0)
220 #define ICALL_RETURN_VAL(VAL) \
222 CLEAR_STACK_WATERMARK \
226 } while (0); } while (0)
228 #define ICALL_RETURN_OBJ(HANDLE) \
230 CLEAR_STACK_WATERMARK \
232 void* __ret = MONO_HANDLE_RAW (HANDLE); \
235 } while (0); } while (0)
238 Handle macros/functions
241 #ifdef ENABLE_CHECKED_BUILD
242 void mono_handle_verify (MonoRawHandle handle);
243 #define HANDLE_INVARIANTS(H) mono_handle_verify((void*)(H))
245 #define HANDLE_INVARIANTS(H) (0)
248 #define TYPED_HANDLE_PAYLOAD_NAME(TYPE) TYPE ## HandlePayload
249 #define TYPED_HANDLE_NAME(TYPE) TYPE ## Handle
250 #define TYPED_OUT_HANDLE_NAME(TYPE) TYPE ## HandleOut
252 #ifdef MONO_HANDLE_TRACK_OWNER
253 #define STRINGIFY_(x) #x
254 #define STRINGIFY(x) STRINGIFY_(x)
255 #define HANDLE_OWNER_STRINGIFY(file,lineno) (const char*) (file ":" STRINGIFY(lineno))
260 * TYPED_HANDLE_DECL(SomeType):
261 * Expands to a decl for handles to SomeType and to an internal payload struct.
263 * For example, TYPED_HANDLE_DECL(MonoObject) (see below) expands to:
267 * } MonoObjectHandlePayload;
269 * typedef MonoObjectHandlePayload* MonoObjectHandle;
270 * typedef MonoObjectHandlePayload* MonoObjectHandleOut;
272 #define TYPED_HANDLE_DECL(TYPE) \
273 typedef struct { TYPE *__raw; } TYPED_HANDLE_PAYLOAD_NAME (TYPE) ; \
274 typedef TYPED_HANDLE_PAYLOAD_NAME (TYPE) * TYPED_HANDLE_NAME (TYPE); \
275 typedef TYPED_HANDLE_PAYLOAD_NAME (TYPE) * TYPED_OUT_HANDLE_NAME (TYPE)
277 * TYPED_VALUE_HANDLE_DECL(SomeType):
278 * Expands to a decl for handles to SomeType (which is a managed valuetype (likely a struct) of some sort) and to an internal payload struct.
279 * For example TYPED_HANDLE_DECL(MonoMethodInfo) expands to:
282 * MonoMethodInfo *__raw;
283 * } MonoMethodInfoHandlePayload;
284 * typedef MonoMethodInfoHandlePayload* MonoMethodInfoHandle;
286 #define TYPED_VALUE_HANDLE_DECL(TYPE) TYPED_HANDLE_DECL(TYPE)
288 /* Have to double expand because MONO_STRUCT_OFFSET is doing token pasting on cross-compilers. */
289 #define MONO_HANDLE_PAYLOAD_OFFSET_(PayloadType) MONO_STRUCT_OFFSET(PayloadType, __raw)
290 #define MONO_HANDLE_PAYLOAD_OFFSET(TYPE) MONO_HANDLE_PAYLOAD_OFFSET_(TYPED_HANDLE_PAYLOAD_NAME (TYPE))
292 #define MONO_HANDLE_INIT ((void*) mono_null_value_handle)
293 #define NULL_HANDLE mono_null_value_handle
295 //XXX add functions to get/set raw, set field, set field to null, set array, set array to null
296 #define MONO_HANDLE_RAW(HANDLE) (HANDLE_INVARIANTS (HANDLE), ((HANDLE)->__raw))
297 #define MONO_HANDLE_DCL(TYPE, NAME) TYPED_HANDLE_NAME(TYPE) NAME = MONO_HANDLE_NEW (TYPE, (NAME ## _raw))
299 #ifndef MONO_HANDLE_TRACK_OWNER
300 #define MONO_HANDLE_NEW(TYPE, VALUE) (TYPED_HANDLE_NAME(TYPE))( mono_handle_new ((MonoObject*)(VALUE)) )
302 #define MONO_HANDLE_NEW(TYPE, VALUE) (TYPED_HANDLE_NAME(TYPE))( mono_handle_new ((MonoObject*)(VALUE), HANDLE_OWNER_STRINGIFY(__FILE__, __LINE__)))
305 #define MONO_HANDLE_CAST(TYPE, VALUE) (TYPED_HANDLE_NAME(TYPE))( VALUE )
307 #define MONO_HANDLE_IS_NULL(HANDLE) (MONO_HANDLE_RAW(HANDLE) == NULL)
311 WARNING WARNING WARNING
313 The following functions require a particular evaluation ordering to ensure correctness.
314 We must not have exposed handles while any sort of evaluation is happening as that very evaluation might trigger
315 a safepoint and break us.
317 This is why we evaluate index and value before any call to MONO_HANDLE_RAW or other functions that deal with naked objects.
319 #define MONO_HANDLE_SETRAW(HANDLE, FIELD, VALUE) do { \
320 MonoObject *__val = (MonoObject*)(VALUE); \
321 MONO_OBJECT_SETREF (MONO_HANDLE_RAW (HANDLE), FIELD, __val); \
324 #define MONO_HANDLE_SET(HANDLE, FIELD, VALUE) do { \
325 MonoObjectHandle __val = MONO_HANDLE_CAST (MonoObject, VALUE); \
326 MONO_OBJECT_SETREF (MONO_HANDLE_RAW (HANDLE), FIELD, MONO_HANDLE_RAW (__val)); \
329 /* N.B. RESULT is evaluated before HANDLE */
330 #define MONO_HANDLE_GET(RESULT, HANDLE, FIELD) do { \
331 MonoObjectHandle __dest = MONO_HANDLE_CAST(MonoObject, RESULT); \
332 mono_gc_wbarrier_generic_store (&__dest->__raw, (MonoObject*)(MONO_HANDLE_RAW(HANDLE)->FIELD)); \
335 #define MONO_HANDLE_NEW_GET(TYPE,HANDLE,FIELD) (MONO_HANDLE_NEW(TYPE,MONO_HANDLE_RAW(HANDLE)->FIELD))
337 #define MONO_HANDLE_GETVAL(HANDLE, FIELD) (MONO_HANDLE_RAW(HANDLE)->FIELD)
339 /* VS doesn't support typeof :( :( :( */
340 #define MONO_HANDLE_SETVAL(HANDLE, FIELD, TYPE, VALUE) do { \
341 TYPE __val = (VALUE); \
342 MONO_HANDLE_RAW (HANDLE)->FIELD = __val; \
345 #define MONO_HANDLE_ARRAY_SETREF(HANDLE, IDX, VALUE) do { \
347 MonoObjectHandle __val = MONO_HANDLE_CAST (MonoObject, VALUE); \
348 mono_array_setref_fast (MONO_HANDLE_RAW (HANDLE), __idx, MONO_HANDLE_RAW (__val)); \
351 #define MONO_HANDLE_ARRAY_SETVAL(HANDLE, TYPE, IDX, VALUE) do { \
353 TYPE __val = (VALUE); \
354 mono_array_set (MONO_HANDLE_RAW (HANDLE), TYPE, __idx, __val); \
357 #define MONO_HANDLE_ARRAY_SETRAW(HANDLE, IDX, VALUE) do { \
359 MonoObject *__val = (MonoObject*)(VALUE); \
360 mono_array_setref_fast (MONO_HANDLE_RAW (HANDLE), __idx, __val); \
363 /* N.B. DEST is evaluated AFTER all the other arguments */
364 #define MONO_HANDLE_ARRAY_GETVAL(DEST, HANDLE, TYPE, IDX) do { \
365 MonoArrayHandle __arr = (HANDLE); \
367 TYPE __result = mono_array_get (MONO_HANDLE_RAW(__arr), TYPE, __idx); \
371 #define MONO_HANDLE_ARRAY_GETREF(DEST, HANDLE, IDX) do { \
372 mono_handle_array_getref (MONO_HANDLE_CAST(MonoObject, (DEST)), (HANDLE), (IDX)); \
375 /* Handles into the interior of objects.
377 * Typically when working with value types, we pass them by reference. In the case where the value type
378 * is a field in a managed class, the reference will be a pointer into the middle of a managed object.
379 * We need to identify such pointers in order for SGen to scan them correctly.
382 #ifndef MONO_HANDLE_TRACK_OWNER
383 #define MONO_HANDLE_NEW_GET_VALPTR(HANDLE,TYPE,FIELD) (TYPE_VALUE_HANDLE_NAME(TYPE))(mono_handle_new_full (&(HANDLE)->__raw->FIELD), TRUE))
385 #define MONO_HANDLE_NEW_GET_VALPTR(HANDLE,TYPE,FIELD) (TYPE_VALUE_HANDLE_NAME(TYPE))(mono_handle_new_full (&(HANDLE)->__raw->FIELD), TRUE, HANDLE_OWNER_STRINGIFY(__FILE__, __LINE__))
389 #define MONO_HANDLE_ASSIGN(DESTH, SRCH) \
390 mono_handle_assign (MONO_HANDLE_CAST (MonoObject, (DESTH)), MONO_HANDLE_CAST(MonoObject, (SRCH)))
392 #define MONO_HANDLE_DOMAIN(HANDLE) (mono_object_domain (MONO_HANDLE_RAW (MONO_HANDLE_CAST (MonoObject, HANDLE))))
395 /* Baked typed handles we all want */
396 TYPED_HANDLE_DECL (MonoString);
397 TYPED_HANDLE_DECL (MonoArray);
398 TYPED_HANDLE_DECL (MonoObject);
399 TYPED_HANDLE_DECL (MonoException);
401 #define NULL_HANDLE_STRING MONO_HANDLE_CAST(MonoString, NULL_HANDLE)
404 This is the constant for a handle that points nowhere.
407 extern const MonoObjectHandle mono_null_value_handle;
410 mono_handle_assign (MonoObjectHandleOut dest, MonoObjectHandle src)
412 mono_gc_wbarrier_generic_store (&dest->__raw, src ? MONO_HANDLE_RAW(src) : NULL);
415 //FIXME this should go somewhere else
416 MonoStringHandle mono_string_new_handle (MonoDomain *domain, const char *data, MonoError *error);
417 MonoArrayHandle mono_array_new_handle (MonoDomain *domain, MonoClass *eclass, uintptr_t n, MonoError *error);
419 mono_array_new_full_handle (MonoDomain *domain, MonoClass *array_class, uintptr_t *lengths, intptr_t *lower_bounds, MonoError *error);
422 uintptr_t mono_array_handle_length (MonoArrayHandle arr);
425 mono_handle_array_getref (MonoObjectHandleOut dest, MonoArrayHandle array, uintptr_t index)
427 mono_gc_wbarrier_generic_store (&dest->__raw, mono_array_get (MONO_HANDLE_RAW (array),gpointer, index));
430 #define mono_handle_class(o) mono_object_class (MONO_HANDLE_RAW (o))
432 /* Local handles to global GC handles and back */
435 mono_gchandle_from_handle (MonoObjectHandle handle, mono_bool pinned);
438 mono_gchandle_get_target_handle (uint32_t gchandle);
441 mono_array_handle_memcpy_refs (MonoArrayHandle dest, uintptr_t dest_idx, MonoArrayHandle src, uintptr_t src_idx, uintptr_t len);
443 /* Pins the MonoArray using a gchandle and returns a pointer to the
444 * element with the given index (where each element is of the given
445 * size. Call mono_gchandle_free to unpin.
448 mono_array_handle_pin_with_size (MonoArrayHandle handle, int size, uintptr_t index, uint32_t *gchandle);
450 #define MONO_ARRAY_HANDLE_PIN(handle,type,index,gchandle_out) mono_array_handle_pin_with_size (MONO_HANDLE_CAST(MonoArray,(handle)), sizeof (type), (index), (gchandle_out))
453 mono_error_set_exception_handle (MonoError *error, MonoExceptionHandle exc);
457 #endif /* __MONO_HANDLE_H__ */