nativecomp: optimize local CU calls at speed 2scratch/better-comp

* etc/NEWS: Document speed-2 local call optimization.
* etc/TODO: Remove completed item.
* lisp/emacs-lisp/comp.el
(comp--cu-local-func-c-name-v): New function.
(comp--call-optim-form-call): Enable named local direct calls
at speed 2.
(comp--function-trampoline-form): New helper.
(comp-trampoline-compile, comp-local-function-trampoline-compile):
Share trampoline generation.
* lisp/emacs-lisp/comp-run.el
(comp-local-function-trampoline--install-now): New function.
(comp-local-function-trampoline-install): Install local trampolines.
Defer trampoline compilation until after load.
* src/comp.c (emit_call, emit_ctxt_code, compile_function)
(load_comp_unit, unload_comp_unit): Add local function relocation
support.
(native_comp_local_function_p): New function.
(comp--install-local-function-trampoline): New subr.
(syms_of_comp): Register it and update trampoline docs.
* src/comp.h (Lisp_Native_Comp_Unit): Add local relocation slot.
(native_comp_local_function_p): Declare.
* src/data.c (Ffset): Install local trampolines for redefined
named local native functions.  Keep skipping anonymous lambdas.
* src/pdumper.c: Clear local relocation state.
* test/src/comp-tests.el
(comp-tests--run-in-sub-emacs): New helper.
(comp-tests--direct-call-redefinition-form): New helper.
(comp-tests-direct-call-redefinition-speed-split): New test.
(comp-tests-anonymous-lambda-recompile): New test.
(comp-tests-direct-call-with-lambdas): Use an explicit output file.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/pdumper.c b/src/pdumper.c
index c21af24d9f1..7108aa64788 100644
--- a/src/pdumper.c
+++ b/src/pdumper.c
@@ -2960,6 +2960,7 @@ dump_native_comp_unit (struct dump_context *ctx,
   START_DUMP_PVEC (ctx, &comp_u->header, struct Lisp_Native_Comp_Unit, out);
   dump_pseudovector_lisp_fields (ctx, &out->header, &comp_u->header);
   out->handle = NULL;
+  out->local_func_relocs = NULL;
 
   dump_off comp_u_off = finish_dump_pvec (ctx, &out->header);
   if (ctx->flags.dump_object_contents)