Bug 560252 - Compute field offsets before writing typelib

girnode.h: Store the total size and alignment for
 GIrNodeStruct/Boxed/Union.

giroffset.c: New file implementing computation of structure
 field offsets.

girnode.c: Compute structure field offsets before writing types
 into the typelib.

docs/typelib-format.txt: Document that a field offset of 0xFFFF
means "unknown". Also fix description of the discriminator_offset
field for unions.

svn path=/trunk/; revision=876

girnode.h

@@ -271,6 +271,9 @@ struct _GIrNodeBoxed
 
   gchar *gtype_name;
   gchar *gtype_init;
+
+  gint alignment;
+  gint size;
   
   GList *members;
 };
@@ -284,6 +287,9 @@ struct _GIrNodeStruct
 
   gchar *gtype_name;
   gchar *gtype_init;
+
+  gint alignment;
+  gint size;
   
   GList *members;
 };
@@ -300,6 +306,9 @@ struct _GIrNodeUnion
   gchar *gtype_name;
   gchar *gtype_init;
 
+  gint alignment;
+  gint size;
+
   gint discriminator_offset;
   GIrNodeType *discriminator_type;
 };
@@ -348,6 +357,13 @@ gboolean g_ir_find_node (GIrModule  *module,
 			 GIrNode   **node_out,
 			 GIrModule **module_out);
 
+/* In giroffsets.c */
+
+void g_ir_node_compute_offsets (GIrNode   *node,
+			        GIrModule *module,
+			        GList     *modules);
+
+
 G_END_DECLS
 
 #endif  /* __G_IR_NODE_H__ */