RUBY_VM_VALID_CONTROL_FRAME_P 1457 eval.c while (RUBY_VM_VALID_CONTROL_FRAME_P(cfp, end_cfp)) { RUBY_VM_VALID_CONTROL_FRAME_P 981 vm_core.h (!RUBY_VM_VALID_CONTROL_FRAME_P((cfp), RUBY_VM_END_CONTROL_FRAME(th)))