Protect the last exception object from GC in `ecall`; fix
MODIFY
src/vm.c
src/vm.c
@@ -302,6 +302,7 @@ ecall(mrb_state *mrb, int i)
mrb_value *self = mrb->c->stack;
struct RObject *exc;
ptrdiff_t cioff;
+ int ai = mrb_gc_arena_save(mrb);
if (i<0) return;
if (ci - mrb->c->cibase > MRB_FUNCALL_DEPTH_MAX) {
@@ -321,9 +322,13 @@ ecall(mrb_state *mrb, int i)
ci->target_class = p->target_class;
mrb->c->stack = mrb->c->stack + ci[-1].nregs;
exc = mrb->exc; mrb->exc = 0;
+ if (exc) {
+ mrb_gc_protect(mrb, mrb_obj_value(exc));
+ }
mrb_run(mrb, p, *self);
mrb->c->ci = mrb->c->cibase + cioff;
if (!mrb->exc) mrb->exc = exc;
+ mrb_gc_arena_restore(mrb, ai);
}
#ifndef MRB_FUNCALL_ARGC_MAX

Protect the last exception object from GC in `ecall`; fix #3702