[LLVMdev] Anonymous Structures

[Nick Johnson]

Thanks,  that works.

And, I might as well provide a code snippet for google to find:

module->addTypeName("foo", OpaqueType::get() );
const Type *struct_foo = module->getTypeByName("foo");

It's really that easy.
Nick


On Wed, Apr 29, 2009 at 11:17 AM, Gordon Henriksen
<gordonhenriksen at me.com> wrote:
> On 2009-04-29, at 10:53, Nick Johnson wrote:
>
>> I am writing a pass which must insert calls to an external library.
>> One of the parameters to functions in this library is a very large,
>> complex structure (let's call it Foo).  [...]  The internal
>> representation of Foo is important to this library, but the code my
>> pass generates will only deal with Foo-pointers.
>>
>> For these reasons, I do not want my pass to emit a definition for
>> struct Foo.  However, to add an external reference to the library
>> functions, I must supply function signatures that include this
>> structure type.  Casting to/from void pointers works, but ultimately
>> generates suboptimal code.
>
> When your pass inserts calls, try declaring the function declarations
> to take i8* or %Foo* (where type %Foo = opaque). LLVM will unify the
> declaration's type when linking with the module that defines the symbol.
>
> — Gordon
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-- 
Nick Johnson