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* Add `comp--install-trampoline' machinery

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* src/comp.c (Fcomp__install_trampoline): New function to
	install a subr trampoline into the function relocation table.
	Once this is done any call from native compiled Lisp to the
	related primitive will go through the `funcall' trampoline
	making advicing effective.
This commit is contained in:
Andrea Corallo 2020-09-19 16:44:53 +02:00
parent 2ab0966b2f
commit 2f78ac32bb
1 changed files with 34 additions and 0 deletions
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34
src/comp.c
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@ -4102,6 +4102,39 @@ If BASE-DIR is nil use the first entry in `comp-eln-load-path'. */)
concat2 (base_dir, Vcomp_native_version_dir));
}
DEFUN ("comp--install-trampoline", Fcomp__install_trampoline,
Scomp__install_trampoline, 2, 2, 0,
doc: /* Install a TRAMPOLINE for primitive SUBR-NAME. */)
(Lisp_Object subr_name, Lisp_Object trampoline)
{
CHECK_SYMBOL (subr_name);
CHECK_SUBR (trampoline);
Lisp_Object orig_subr = Fsymbol_function (subr_name);
CHECK_SUBR (orig_subr);
/* FIXME: add a post dump load trampoline machinery to remove this
check. */
if (will_dump_p ())
signal_error ("Trying to advice unexpected primitive before dumping",
subr_name);
Lisp_Object subr_l = Vcomp_subr_list;
ptrdiff_t i = ARRAYELTS (helper_link_table);
FOR_EACH_TAIL (subr_l)
{
Lisp_Object subr = XCAR (subr_l);
if (EQ (subr, orig_subr))
{
freloc.link_table[i] = XSUBR (trampoline)->function.a0;
return Qt;
}
i++;
}
signal_error ("Trying to install trampoline for non existent subr",
subr_name);
return Qnil;
}
DEFUN ("comp--init-ctxt", Fcomp__init_ctxt, Scomp__init_ctxt,
0, 0, 0,
doc: /* Initialize the native compiler context. Return t on success. */)
@ -5162,6 +5195,7 @@ native compiled one. */);
defsubr (&Scomp_el_to_eln_filename);
defsubr (&Scomp_native_driver_options_effective_p);
defsubr (&Scomp__install_trampoline);
defsubr (&Scomp__init_ctxt);
defsubr (&Scomp__release_ctxt);
defsubr (&Scomp__compile_ctxt_to_file);