The only mention of FixedBufferAttribute I see is in the C# code in mcs.
I looked through all the mono C code and I see several places where
MonoCustomAttrInfo is used but no where is it doing anything with fixed
buffers. Is there some documentation or more examples of what is in the
MonoCustomAttrInfo data for something like this?
I experimented a bit and used mono_custom_attrs_from_class() to pull the
MonoCustomAttrInfo for the class. It looks like there are two attributes.
{num_attrs = 2, cached = 0, image = 0x10566ed0, attrs = 0x1061c630}
So looking at the two attributes I see
attrs[0]: {ctor = 0x1061cb10, data_size = 4, data = 0x3fffb7840e71 "\001"}
attrs[1]: {ctor = 0x1061c990, data_size = 4, data = 0x3fffb7840e71 "\001"}
The data fields are identical and are 01 00 00 00 or maybe the other way
around depending on what the field represents (this is a LE machine).
The ctors are
(gdb) print cinfo->attrs[0].ctor->klass->name
$14 = 0x3fffb5b225b6 "UnsafeValueTypeAttribute"
(gdb) print cinfo->attrs[1].ctor->klass->name
$15 = 0x3fffb5b22281 "CompilerGeneratedAttribute"
What do those represent?
On 08/06/2015 12:23 PM, Zoltan Varga wrote:
Hi,
The type has a FixedBufferAttribute custom attribute which contains
the length of the array. There are some functions in reflection.c
like mono_custom_attrs_from_class () which can return information about it.
Zoltan
On Thu, Aug 6, 2015 at 12:32 PM, Bill Seurer <seu...@linux.vnet.ibm.com
<mailto:seu...@linux.vnet.ibm.com>> wrote:
In some code in mono/mini I need to figure out how many elements
there are in a fixed buffer field in a struct, something like this:
public unsafe struct double_array4 {
public fixed double f1[4];
}
So I'd need to know "4".
I can get the MonoClass of the field from the MonoFieldType and if I
print out the name I get
Test_double.double_array4.<f1>__FixedBuffer0
so it knows it is a fixed buffer. If I look at the fields of the
struct in the above example there is just one and it's a double.
So how can I figure out the number of elements?
Thanks!
--
-Bill Seurer
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