Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: mono-1-1-8
Fetching contributors…

Cannot retrieve contributors at this time

file 58 lines (42 sloc) 1.554 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
Author: Dietmar Maurer (dietmar@ximian.com)
(C) 2001 Ximian, Inc.

Object and VTable layout
========================

The first pointer inside an Object points to a MonoVtable structure. Objects
also contains a MonoThreadsSync structure which is used by the mono Thread
implementation.
 
typedef struct {
MonoVTable *vtable;
MonoThreadsSync synchronisation;

/* object specific data goes here */
} MonoObject;

The MonoVtable contains the vtable, interface offsets and a pointer to static
class data. Each object/vtable belongs to exactly one AppDomain.

typedef struct {
MonoClass *klass;
MonoDomain *domain;
        gpointer *interface_offsets;
/* a pointer to static data */
        gpointer data;
/* the variable sized vtable is included at the end */
        gpointer vtable [0];
} MonoVTable;

The MonoClass contains domain independent Class infos.

typedef struct {
/* various class infos */
MonoClass *parent;
const char *name;
const char *name_space;
...
} MonoClass;


Calling virtual functions:
==========================

Each MonoMethod (if virtual) has an associated slot, which is an index into the
VTable. So we can use the following code to compute the address of a virtual
function:
 
method_addr = object->vtable->vtable [method->slot];


Calling interface methods:
==========================

Each interface class is associated with an unique ID. The following code
computes the address of an interface function:

method_addr = *(object->vtable->interface_offsets [interface_id] + method->slot*4);
Something went wrong with that request. Please try again.