I was confused about the behavior of root-trace link, what's the different between link "return" and link self(loop or recursion):
local function f1(v) if v == 0 then return end f1(v - 1) end f1(109)
[TRACE 1 t1.lua:1 return]
local function f1(v) if v == 0 then return end f1(v - 1) end f1(112)
[TRACE 1 t1.lua:1 up-recursion]
And what does link in root-trace actually do?
the condition of calling penalty_pc():
if (J->parent == 0 && !bc_isret(bc_op(J->cur.startins)))
means first root trace and not in tail-recursion? and the inner condition:
if (J->exitno == 0)
what does this condition actually mean?