// This runs on the Rust stack
void task_start_wrapper(spawn_args *a)
{
rust_task *task = a->task;
bool threw_exception = false;
try {
// The first argument is the return pointer; as the task fn
// must have void return type, we can safely pass 0.
a->f(0, a->envptr, a->argptr);
} catch (rust_task *ex) {
assert(ex == task && "Expected this task to be thrown for unwinding");
threw_exception = true;
if (task->c_stack) {
task->return_c_stack();
}
// Since we call glue code below we need to make sure we
// have the stack limit set up correctly
task->reset_stack_limit();
}
// We should have returned any C stack by now
assert(task->c_stack == NULL);
rust_opaque_box* env = a->envptr;
if(env) {
// free the environment (which should be a unique closure).
const type_desc *td = env->td;
td->drop_glue(NULL, NULL, NULL, box_body(env));
upcall_exchange_free(env);
}
// The cleanup work needs lots of stack
cleanup_args ca = {a, threw_exception};
task->call_on_c_stack(&ca, (void*)cleanup_task);
task->ctx.next->swap(task->ctx);
}
// FIXME (#2861): Alias used by libcore/rt.rs to avoid naming conflicts with
// autogenerated wrappers for upcall_exchange_free. Remove this when we fully
// move away away from the C upcall path.
extern "C" CDECL void
rust_upcall_exchange_free(void *ptr) {
return upcall_exchange_free(ptr);
}
