julia

be15e12b - bootstrap: Move default constructor generation from C/flisp to Julia (#61036)

bootstrap: Move default constructor generation from C/flisp to Julia (#61036) Currently there is a special backdoor into lowering that is used by the _defaultctors builtin to generate the code for default inner and outer constructors. This codegen is specifically delayed because the code we want to generate is dependent on type information, which is not available until runtime. The code that performs the type-dependent analysis is currently in C. This backdoor is annoying, because it complicates the interface to lowering, which would otherwise be rather straightforward. It is also unnecessary. With a little bit of effort, we can define the type analysis logic relatively early in bootstrap and construct the relevant Exprs there as well, replacing code that was originally in C/flisp. The primary annoyance is that we need to explicitly write out all constructors in early bootstrap before the implementation is available. However, it is possible to define this fairly early, so the impact is not that bad. This is prepratory work for a future flisp-less bootstrap using JuliaLowering (which currently has no mechanism for this and depends on flisp). There are future questions around how to handle provenance for these Exprs, but since the current implementation doesn't answer those questions either, we need not do so at this stage. Written by Claude. Co-authored-by: Keno Fischer <Keno@users.noreply.github.com>