id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc	lang	patch	platform
1733	calling convention broken	fperrad		"The scheme of calling convention used by Lua is broken.

With Lua, all known parameters are optional, and extra parameters or vararg are collected by a final slurpy.

The following PIR code shows the problem :

{{{
.sub 'main' :main
    $P1 = box ""p1""
    $P2 = box ""p2""
    $P3 = box ""p3""
    f($P1, $P2, $P3) # ok
    f($P1, $P2) # ok
    f($P1) # fails
.end

# f() has 2 known parameters
.sub 'f' 
    .param pmc p1 :optional
    .param int has_p1 :opt_flag
    .param pmc p2 :optional
    .param int has_p2 :opt_flag
    .param pmc extra :slurpy
    unless has_p1 goto L1
    say p1
    unless has_p2 goto L1
    say p2
    $P0 = iter extra
  L2:
    unless $P0 goto L1
    $P1 = shift $P0
    say $P1
    goto L2
  L1:
.end
}}}

Here, the current output :

{{{
p1
p2
p3
p1
p2
FixedPMCArray: Cannot set array size to a negative number (-1)
current instr.: 'f' pc 45 (prm.pir:8)
called from Sub 'main' pc 40 (prm.pir:8)
}}}

"	bug	closed	normal		core	2.6.0	high	fixed