D.gnu - Strange error in DGC for Arm (2.0.59 with gcc 4.7.2)
- Timofei Bolshakov (15/15) Aug 06 2013 Hello!
- Johannes Pfau (16/36) Aug 23 2013 There are bugs in std.variant on ARM.
- Johannes Pfau (3/44) Aug 24 2013 http://d.puremagic.com/issues/show_bug.cgi?id=10740
Hello!
I got strange problem.
When I am trying to send a message containing a struct of size 30
I am getting a strange exception:
core.exception.AssertError /home/tbolshakov/x-tools/arm-unknown-linux-gnueabi-gdc/lib/gcc/arm-unknown-linux-gnueabi/4.7.2/include/d
std/variant.d(280):
target must be non-null
The code looks like:
// enum ove the byte string string
uint ushort struct
send( tid, MessageTag.SPTRecord, gwmac_str,
mac2HexString(t[0].idup), utc, ms, aStruct );
Does anybody have an idea why? Does anybody have an idea hw to
fix it?
I have DGC version 2.0.59 made with gcc 4.7.2 (crosstool-ng
1.18.0).
Aug 06 2013
Am Wed, 07 Aug 2013 00:05:35 +0200
schrieb "Timofei Bolshakov" <tbolsh gmail.com>:
Hello!
I got strange problem.
When I am trying to send a message containing a struct of size 30
I am getting a strange exception:
core.exception.AssertError /home/tbolshakov/x-tools/arm-unknown-linux-gnueabi-gdc/lib/gcc/arm-unknown-linux-gnueabi/4.7.2/include/d
std/variant.d(280):
target must be non-null
The code looks like:
// enum ove the byte string string
uint ushort struct
send( tid, MessageTag.SPTRecord, gwmac_str,
mac2HexString(t[0].idup), utc, ms, aStruct );
Does anybody have an idea why? Does anybody have an idea hw to
fix it?
I have DGC version 2.0.59 made with gcc 4.7.2 (crosstool-ng
1.18.0).
There are bugs in std.variant on ARM.
But in this case it might have a different cause: std.concurrency
stores data in a Variant (see std.variant). A variant can only store
things with a maximum size of creal.sizeof. On x86 creal is a pair of 2
reals, so 12/16bytes + alignment = 32 bytes.
On ARM real == double = 8 bytes, so creal.sizeof is 16 bytes. So the
max size of a struct which can be stored in a Variant is 16 on ARM.
This is basically a problem in Variant's design, it's not really meant
to support struct types. It's for basic types only. This is why
VariantN exists where you can define your own max size. But you can't
access that functionality through std.concurrency.
I'd say file a bug report on std.concurrency that big structs are not
supported and mention the issue that on non-x86 the max size is 16 byte
only.
Aug 23 2013
Johannes Pfau <nospam example.com> Am Fri, 23 Aug 2013 09:46:13 +0200 schrieb Johannes Pfau <nospam example.com>:Am Wed, 07 Aug 2013 00:05:35 +0200 schrieb "Timofei Bolshakov" <tbolsh gmail.com>:http://d.puremagic.com/issues/show_bug.cgi?id=10740Hello! I got strange problem. When I am trying to send a message containing a struct of size 30 I am getting a strange exception: core.exception.AssertError /home/tbolshakov/x-tools/arm-unknown-linux-gnueabi-gdc/lib/gcc/arm-unknown-linux-gnueabi/4.7.2/include/d std/variant.d(280): target must be non-null The code looks like: // enum ove the byte string string uint ushort struct send( tid, MessageTag.SPTRecord, gwmac_str, mac2HexString(t[0].idup), utc, ms, aStruct ); Does anybody have an idea why? Does anybody have an idea hw to fix it? I have DGC version 2.0.59 made with gcc 4.7.2 (crosstool-ng 1.18.0).There are bugs in std.variant on ARM. But in this case it might have a different cause: std.concurrency stores data in a Variant (see std.variant). A variant can only store things with a maximum size of creal.sizeof. On x86 creal is a pair of 2 reals, so 12/16bytes + alignment = 32 bytes. On ARM real == double = 8 bytes, so creal.sizeof is 16 bytes. So the max size of a struct which can be stored in a Variant is 16 on ARM. This is basically a problem in Variant's design, it's not really meant to support struct types. It's for basic types only. This is why VariantN exists where you can define your own max size. But you can't access that functionality through std.concurrency. I'd say file a bug report on std.concurrency that big structs are not supported and mention the issue that on non-x86 the max size is 16 byte only.
Aug 24 2013