Re: Manual delegates
On 2018-09-16 16:12, Guillaume Piolat wrote:
Anyone has any information about the ABI of delegates?
In particular how to call them with a particular "this"/frame pointer?
You can explicitly set the context pointer of a delegate using the
".ptr" property:
class Foo
{
void bar() { }
}
void main()
{
auto a = new Foo;
void delegate () dg;
dg.ptr = cast(void*) a;
dg.funcptr =
dg();
}
To solve a hairy problem I need a delegate with a synthesized frame
pointer.
https://dpaste.dzfl.pl/cf44417c98f9
The problem is that delegate forwarding seems to require GC closures. I
want manually-managed closures.
--
/Jacob Carlborg
Re: Manual delegates
On Sunday, 16 September 2018 at 14:45:08 UTC, Vladimir Panteleev wrote: On Sunday, 16 September 2018 at 14:12:27 UTC, Guillaume Piolat wrote: Anyone has any information about the ABI of delegates? In particular how to call them with a particular "this"/frame pointer? To solve a hairy problem I need a delegate with a synthesized frame pointer. https://dpaste.dzfl.pl/cf44417c98f9 The problem is that delegate forwarding seems to require GC closures. I want manually-managed closures. Have a look at the implementation of toDelegate, which does exactly this: https://github.com/dlang/phobos/blob/v2.082.0/std/functional.d#L1463 Thanks. I ended up using toDelegate internally, and enclosing the resulting delegate with code returning a struct with `opCall`. The conclusion is that "struct with `opCall`" is much easier to implement that faking delegate ABI, this is less brittle ; and doesn't add a lifetime of a trampoline context to extend the input delegate.
Re: Manual delegates
On Sunday, 16 September 2018 at 14:12:27 UTC, Guillaume Piolat wrote: Anyone has any information about the ABI of delegates? In particular how to call them with a particular "this"/frame pointer? To solve a hairy problem I need a delegate with a synthesized frame pointer. https://dpaste.dzfl.pl/cf44417c98f9 The problem is that delegate forwarding seems to require GC closures. I want manually-managed closures. Have a look at the implementation of toDelegate, which does exactly this: https://github.com/dlang/phobos/blob/v2.082.0/std/functional.d#L1463
Re: Manual delegates
On Sunday, 16 September 2018 at 14:12:27 UTC, Guillaume Piolat wrote: In particular how to call them with a particular "this"/frame pointer? Related thread: https://forum.dlang.org/post/wjbhpztovxratexao...@forum.dlang.org
Manual delegates
Anyone has any information about the ABI of delegates? In particular how to call them with a particular "this"/frame pointer? To solve a hairy problem I need a delegate with a synthesized frame pointer. https://dpaste.dzfl.pl/cf44417c98f9 The problem is that delegate forwarding seems to require GC closures. I want manually-managed closures.
