[cfe-dev] Adding new data type

[Eli Friedman]

On Fri, Apr 30, 2010 at 5:38 PM, kalyan ponnala
<ponnala.kalyan at gmail.com> wrote:
> Hi guys,
>
> I was trying to add this header file named "NEW_DATATYPES.h"  with the
> following information into clang.
>
> typedef int int_2 __attribute__((ext_vector_type(2)));
>
> I added it to clang\lib\Headers. And in the source program when I try to do:
>>>code-1:
>
> int main()
> {
>     int_2 abc = { 1, 2 };
>     int_2 bbc = { 3, 4} ;
>     abc.x = bbc.y;
> return 0;
> }
>
> clang gives me an error. saying that it does not identify int_2.
> When I add the header file's name "NEW_DATATYPES.h" to the source like
> below, clang compiles the code fine.
>>>code2:
>
> #include "NEW_DATATYPES.h"
> int main()
> {
>     int_2 abc = { 1, 2 };
>     int_2 bbc = { 3, 4} ;
>     abc.x = bbc.y;
> return 0;
> }
>
> But what I want is that the clang should be able to compile the code-1 fine
> where I dont have to add the header file explicitly. Can someone please tell
> me how to do this without actually making any changes to the existing clang
> architecture. I am trying not to disturb the code.

Pass "-include NEW_DATATYPES.h" on the command-line, or do the
equivalent in the code that calls clang::InitializePreprocessor, or
modify lib/Frontend/InitializePreprocessor.cpp to either add the
include or add the typedef directly.

-Eli

> Thanks a ton.
>
> Kalyan
>
> On Fri, Apr 30, 2010 at 2:08 AM, kalyan ponnala <ponnala.kalyan at gmail.com>
> wrote:
>>
>> hi,
>>
>> Thanks for the replies. @john :  I am looking into "typedef int int_4
>> __attribute__((ext_vector_type(4)));" way of adding the vector data type. I
>> do not want to change the array type to vector type. Right now I am trying
>> to add this as a header file into the clang architecture so that it won't
>> look bad and at the same time it would make the new data type "int_4" look
>> like its a built in data type in clang when we write code at source level. I
>> am still trying to figure it out. It looks like headers added to
>> clang/lib/Headers are not recognized as I thought they would be. I am using
>> visual studio 2008 on windows 7.
>>
>> Thanks.
>>
>>
>> On Thu, Apr 29, 2010 at 7:29 PM, Douglas Gregor <dgregor at apple.com> wrote:
>>>
>>> On Apr 29, 2010, at 4:28 PM, kalyan ponnala wrote:
>>>
>>> Thanks for letting me know about the vector types Douglas. I think I can
>>> use this to implement the new vector datatype. Can you tell me a better way
>>> to add this as a header file to Clang. I dont want this typedef way to be
>>> visible on the source side. (I dont want to add this as a header file on the
>>> source side.). If I wanted the header file to contain something like
>>> typedef int int_4 __attribute__((ext_vector_type(4)));
>>>
>>> Where can I add this header file inside clang so that it can understand
>>> something like int_4 on the source code, i mean to which target should I add
>>> it?
>>>
>>> Look in clang/libs/Headers for other Clang-supplied headers.
>>> - Doug
>>>
>>> Thanks again.
>>>
>>> On Thu, Apr 29, 2010 at 4:59 PM, Douglas Gregor <dgregor at apple.com>
>>> wrote:
>>>>
>>>> On Apr 29, 2010, at 1:35 PM, kalyan ponnala wrote:
>>>>
>>>> > Hi guys,
>>>> >
>>>> > Thanks for the replies. I am trying to add support to a new
>>>> > architecture called Line Associative Registers. It has vector registers in
>>>> > it. I would like to add a vector data type such as int[4] which could access
>>>> > a register with a width of 4 integers in it (max). Since it has to be
>>>> > mentioned in the source as
>>>> >
>>>> > int[4] = {1, 2, 3, 4}
>>>> >
>>>> > I am not sure about how to proceed. This form looks like an array with
>>>> > 4 elements but I want it to be a datatype.
>>>> > I was looking into targetinfo.h and initpreprocessor.cpp. it looks
>>>> > like I can add a new type here or change the existing one. And about the
>>>> > type.h in ClangAST target, will it work if I added this type here.
>>>> >
>>>> > Any advices about how to proceed would be really appreciated.
>>>>
>>>> Clang already has vector types (VectorType) and "extended" vector types
>>>> (ExtVectorType). They're created using attributes, e.g.,
>>>>
>>>>        typedef int v4si __attribute__ ((vector_size (16)));
>>>>
>>>> You could probably just re-use these vector types, possibly tweaking
>>>> their semantics a bit, for your architecture.
>>>>
>>>>        - Doug
>>>
>>>
>>> --
>>> Kalyan Ponnala
>>> phone: 8163772059
>>>
>>
>>
>>
>> --
>> Kalyan Ponnala
>> phone: 8163772059
>
>
>
> --
> Kalyan Ponnala
> phone: 8163772059
>
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