2 * handle.h: Handle to object in native code
5 * - Ludovic Henry <ludovic@xamarin.com>
6 * - Aleksey Klieger <aleksey.klieger@xamarin.com>
7 * - Rodrigo Kumpera <kumpera@xamarin.com>
9 * Copyright 2016 Dot net foundation.
10 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
13 #ifndef __MONO_HANDLE_H__
14 #define __MONO_HANDLE_H__
19 #include <mono/metadata/object.h>
20 #include <mono/metadata/class.h>
21 #include <mono/utils/mono-error-internals.h>
22 #include <mono/utils/mono-threads.h>
23 #include <mono/utils/checked-build.h>
31 The handle stack is designed so it's efficient to pop a large amount of entries at once.
32 The stack is made out of a series of fixed size segments.
34 To do bulk operations you use a stack mark.
39 3 is the number of fields besides the data in the struct;
40 128 words makes each chunk 512 or 1024 bytes each
42 #define OBJECTS_PER_HANDLES_CHUNK (128 - 3)
45 Whether this config needs stack watermark recording to know where to start scanning from.
48 #define MONO_NEEDS_STACK_WATERMARK 1
51 typedef struct _HandleChunk HandleChunk;
54 int size; //number of bytes
55 HandleChunk *prev, *next;
56 MonoObject *objects [OBJECTS_PER_HANDLES_CHUNK];
60 HandleChunk *top; //alloc from here
61 HandleChunk *bottom; //scan from here
69 typedef void *MonoRawHandle;
71 typedef void (*GcScanFunc) (gpointer*, gpointer);
74 MonoRawHandle mono_handle_new (MonoObject *object);
76 void mono_handle_stack_scan (HandleStack *stack, GcScanFunc func, gpointer gc_data);
77 HandleStack* mono_handle_stack_alloc (void);
78 void mono_handle_stack_free (HandleStack *handlestack);
79 MonoRawHandle mono_stack_mark_pop_value (MonoThreadInfo *info, HandleStackMark *stackmark, MonoRawHandle value);
80 void mono_stack_mark_record_size (MonoThreadInfo *info, HandleStackMark *stackmark, const char *func_name);
83 mono_stack_mark_init (MonoThreadInfo *info, HandleStackMark *stackmark)
85 HandleStack *handles = (HandleStack *)info->handle_stack;
86 stackmark->size = handles->top->size;
87 stackmark->chunk = handles->top;
91 mono_stack_mark_pop (MonoThreadInfo *info, HandleStackMark *stackmark)
93 HandleStack *handles = (HandleStack *)info->handle_stack;
94 handles->top->size = stackmark->size;
95 mono_memory_write_barrier ();
96 handles->top = stackmark->chunk;
102 #define SETUP_ICALL_COMMON \
105 MonoThreadInfo *__info = mono_thread_info_current (); \
106 error_init (&error); \
108 #define CLEAR_ICALL_COMMON \
109 mono_error_set_pending_exception (&error);
111 #define SETUP_ICALL_FRAME \
112 HandleStackMark __mark; \
113 mono_stack_mark_init (__info, &__mark);
115 #define CLEAR_ICALL_FRAME \
116 mono_stack_mark_record_size (__info, &__mark, __FUNCTION__); \
117 mono_stack_mark_pop (__info, &__mark);
119 #ifdef MONO_NEEDS_STACK_WATERMARK
122 mono_thread_info_pop_stack_mark (MonoThreadInfo *info, void *old_mark)
124 info->stack_mark = old_mark;
128 mono_thread_info_push_stack_mark (MonoThreadInfo *info, void *mark)
130 void *old = info->stack_mark;
131 info->stack_mark = mark;
135 #define SETUP_STACK_WATERMARK \
137 __builtin_unwind_init (); \
138 void *__old_stack_mark = mono_thread_info_push_stack_mark (__info, &__dummy);
140 #define CLEAR_STACK_WATERMARK \
141 mono_thread_info_pop_stack_mark (__info, __old_stack_mark);
144 #define SETUP_STACK_WATERMARK
145 #define CLEAR_STACK_WATERMARK
148 #define ICALL_ENTRY() \
151 SETUP_STACK_WATERMARK
153 #define ICALL_RETURN() \
155 CLEAR_STACK_WATERMARK \
159 } while (0); } while (0)
161 #define ICALL_RETURN_VAL(VAL) \
163 CLEAR_STACK_WATERMARK \
167 } while (0); } while (0)
169 #define ICALL_RETURN_OBJ(HANDLE) \
171 CLEAR_STACK_WATERMARK \
173 void* __ret = MONO_HANDLE_RAW (HANDLE); \
176 } while (0); } while (0)
179 Handle macros/functions
182 #ifdef ENABLE_CHECKED_BUILD
183 void mono_handle_verify (MonoRawHandle handle);
184 #define HANDLE_INVARIANTS(H) mono_handle_verify((void*)(H))
186 #define HANDLE_INVARIANTS(H) (0)
189 #define TYPED_HANDLE_PAYLOAD_NAME(TYPE) TYPE ## HandlePayload
190 #define TYPED_HANDLE_NAME(TYPE) TYPE ## Handle
193 * TYPED_HANDLE_DECL(SomeType):
194 * Expands to a decl for handles to SomeType and to an internal payload struct.
196 * For example, TYPED_HANDLE_DECL(MonoObject) (see below) expands to:
200 * } MonoObjectHandlePayload;
202 * typedef MonoObjectHandlePayload* MonoObjectHandle;
204 #define TYPED_HANDLE_DECL(TYPE) typedef struct { TYPE *__obj; } TYPED_HANDLE_PAYLOAD_NAME (TYPE) ; typedef TYPED_HANDLE_PAYLOAD_NAME (TYPE) * TYPED_HANDLE_NAME (TYPE)
205 /* Have to double expand because MONO_STRUCT_OFFSET is doing token pasting on cross-compilers. */
206 #define MONO_HANDLE_PAYLOAD_OFFSET_(PayloadType) MONO_STRUCT_OFFSET(PayloadType, __obj)
207 #define MONO_HANDLE_PAYLOAD_OFFSET(TYPE) MONO_HANDLE_PAYLOAD_OFFSET_(TYPED_HANDLE_PAYLOAD_NAME (TYPE))
209 #define MONO_HANDLE_INIT ((void*) mono_null_value_handle)
210 #define NULL_HANDLE mono_null_value_handle
212 //XXX add functions to get/set raw, set field, set field to null, set array, set array to null
213 #define MONO_HANDLE_RAW(HANDLE) (HANDLE_INVARIANTS (HANDLE), ((HANDLE)->__obj))
214 #define MONO_HANDLE_DCL(TYPE, NAME) TYPED_HANDLE_NAME(TYPE) NAME = (TYPED_HANDLE_NAME(TYPE))(mono_handle_new ((MonoObject*)(NAME ## _raw)))
215 #define MONO_HANDLE_NEW(TYPE, VALUE) (TYPED_HANDLE_NAME(TYPE))( mono_handle_new ((MonoObject*)(VALUE)) )
216 #define MONO_HANDLE_CAST(TYPE, VALUE) (TYPED_HANDLE_NAME(TYPE))( VALUE )
219 WARNING WARNING WARNING
221 The following functions require a particular evaluation ordering to ensure correctness.
222 We must not have exposed handles while any sort of evaluation is happening as that very evaluation might trigger
223 a safepoint and break us.
225 This is why we evaluate index and value before any call to MONO_HANDLE_RAW or other functions that deal with naked objects.
227 #define MONO_HANDLE_SETRAW(HANDLE, FIELD, VALUE) do { \
228 MonoObject *__val = (MonoObject*)(VALUE); \
229 MONO_OBJECT_SETREF (MONO_HANDLE_RAW (HANDLE), FIELD, __val); \
232 #define MONO_HANDLE_SET(HANDLE, FIELD, VALUE) do { \
233 MonoObjectHandle __val = MONO_HANDLE_CAST (MonoObject, VALUE); \
234 MONO_OBJECT_SETREF (MONO_HANDLE_RAW (HANDLE), FIELD, MONO_HANDLE_RAW (__val)); \
237 /* VS doesn't support typeof :( :( :( */
238 #define MONO_HANDLE_SETVAL(HANDLE, FIELD, TYPE, VALUE) do { \
239 TYPE __val = (VALUE); \
240 MONO_HANDLE_RAW (HANDLE)->FIELD = __val; \
243 #define MONO_HANDLE_ARRAY_SETREF(HANDLE, IDX, VALUE) do { \
245 MonoObjectHandle __val = MONO_HANDLE_CAST (MonoObject, VALUE); \
246 mono_array_setref_fast (MONO_HANDLE_RAW (HANDLE), __idx, MONO_HANDLE_RAW (__val)); \
249 #define MONO_HANDLE_ARRAY_SETRAW(HANDLE, IDX, VALUE) do { \
251 MonoObject *__val = (MonoObject*)(VALUE); \
252 mono_array_setref_fast (MONO_HANDLE_RAW (HANDLE), __idx, __val); \
256 #define MONO_HANDLE_DOMAIN(HANDLE) (mono_object_domain (MONO_HANDLE_RAW (MONO_HANDLE_CAST (MonoObject, HANDLE))))
258 /* Baked typed handles we all want */
259 TYPED_HANDLE_DECL (MonoString);
260 TYPED_HANDLE_DECL (MonoArray);
261 TYPED_HANDLE_DECL (MonoObject);
263 #define NULL_HANDLE_STRING MONO_HANDLE_CAST(MonoString, NULL_HANDLE)
266 This is the constant for a handle that points nowhere.
269 extern const MonoObjectHandle mono_null_value_handle;
272 //FIXME this should go somewhere else
273 MonoStringHandle mono_string_new_handle (MonoDomain *domain, const char *data, MonoError *error);
274 MonoArrayHandle mono_array_new_handle (MonoDomain *domain, MonoClass *eclass, uintptr_t n, MonoError *error);
278 #endif /* __MONO_HANDLE_H__ */