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Better usage of rb_ec_clear_vm_stack to maintain invariants.

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This commit is contained in:
Samuel Williams 2019-07-19 15:45:44 +12:00
parent 6eef80d824
commit cf93f98a60
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2 changed files with 8 additions and 7 deletions
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13
cont.c
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@ -720,7 +720,6 @@ fiber_stack_release(rb_fiber_t * fiber)
// The stack is no longer associated with this execution context:
rb_ec_clear_vm_stack(ec);
ec->cfp = NULL;
}
static const char *
@ -837,9 +836,7 @@ cont_mark(void *ptr)
RUBY_MARK_ENTER("cont");
rb_gc_mark_no_pin(cont->value);
if (cont->saved_ec.cfp) {
rb_execution_context_mark(&cont->saved_ec);
}
rb_execution_context_mark(&cont->saved_ec);
rb_gc_mark(cont_thread_value(cont));
if (cont->saved_vm_stack.ptr) {
@ -1157,7 +1154,9 @@ cont_capture(volatile int *volatile stat)
cont->saved_vm_stack.ptr = ALLOC_N(VALUE, ec->vm_stack_size);
MEMCPY(cont->saved_vm_stack.ptr, ec->vm_stack, VALUE, ec->vm_stack_size);
#endif
rb_ec_clear_vm_stack(&cont->saved_ec);
// At this point, `cfp` is valid but `vm_stack` should be cleared:
rb_ec_set_vm_stack(&cont->saved_ec, NULL, 0);
VM_ASSERT(cont->saved_ec.cfp != NULL);
cont_save_machine_stack(th, cont);
/* backup ensure_list to array for search in another context */
@ -1693,8 +1692,10 @@ fiber_t_alloc(VALUE fiber_value)
fiber->cont.self = fiber_value;
fiber->cont.type = FIBER_CONTEXT;
cont_init(&fiber->cont, th);
fiber->cont.saved_ec.fiber_ptr = fiber;
fiber->cont.saved_ec.cfp = NULL;
rb_ec_clear_vm_stack(&fiber->cont.saved_ec);
fiber->prev = NULL;
/* fiber->status == 0 == CREATED

2
vm.c
View file

@ -2675,7 +2675,7 @@ rb_ec_clear_vm_stack(rb_execution_context_t *ec)
rb_ec_set_vm_stack(ec, NULL, 0);
// Avoid dangling pointers:
// ec->cfp = NULL;
ec->cfp = NULL;
}
static void