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Re: [RFC] Adding a real HashTable implementation to gnulib

From: Florian Weimer
Subject: Re: [RFC] Adding a real HashTable implementation to gnulib
Date: Fri, 04 Jan 2019 12:59:06 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

* Tim Rühsen:

> But I still wonder why
>  - nested functions need an executable stack (why does the code have to
> be run on the stack ?)

The static chain pointer needs to be passed to the nest function, but
most ABIs only have a code pointer.  So a trampoline is written to the
stack which sets up the static chain (in a hidden function argument) and
calls the implementation.  The address of the trampoline is used as the
code pointer for the nested function.

>  - there are no efforts to standardize either nested functions or blocks
> (clang has 'blocks' instead of nested functions) or both. (There is a
> C22 panel, but I couldn't find anything useful on their task list.)

You can simply use C++.  C++11 and later have std::function and lambdas.

The standardization of lambdas for C has been abandoned, as far as I


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