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155 lines
2.8 KiB
155 lines
2.8 KiB
/*
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* Copyright (c) 2018-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <functional>
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struct S {
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int f;
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S() { f = 1; }
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};
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int FN_ref_capture_destroy_invoke_bad() {
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std::function<int()> f;
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{
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S s;
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f = [&s] { return s.f; };
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} // destructor for s called here
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return f(); // s used here
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}
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int FN_implicit_ref_capture_destroy_invoke_bad() {
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std::function<int()> f;
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{
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auto s = S();
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f = [&] { return s.f; };
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}
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return f();
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}
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int FN_reassign_lambda_capture_destroy_invoke_bad() {
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std::function<int()> f;
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{
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auto s = S();
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auto tmp = [&] { return s.f; };
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f = tmp;
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}
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return f();
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}
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// frontend doesn't understand difference between capture-by-value and
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// capture-by-ref, need to fix
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int value_capture_destroy_invoke_ok() {
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std::function<int()> f;
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{
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S s;
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f = [s] { return s.f; };
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}
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return f();
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}
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// same thing here
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int implicit_value_capture_destroy_invoke_ok() {
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std::function<int()> f;
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{
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S s;
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f = [=] { return s.f; };
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}
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return f();
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}
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int ref_capture_invoke_ok() {
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std::function<int()> f;
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int ret;
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{
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S s;
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f = [&s] { return s.f; };
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ret = f();
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}
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return ret;
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}
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void invoke_twice_ok() {
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std::function<int()> f;
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int ret;
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{
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S s;
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f = [&s] { return s.f; };
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f();
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f();
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}
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}
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std::function<int()> ref_capture_read_lambda_ok() {
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std::function<int()> f;
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int ret;
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{
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S s;
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f = [&s] { return s.f; };
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}
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auto tmp =
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f; // reading (but not invoking) the lambda doesn't use its captured vars
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}
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// we'll miss this because we count invoking a lambda object as a use of its
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// captured vars, not the lambda object itself.
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void FN_delete_lambda_then_call_bad() {
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auto lambda = [] { return 1; };
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~lambda();
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return lambda();
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}
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// need to treat escaping as a use in order to catch this
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std::function<int()> FN_ref_capture_return_lambda_bad() {
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std::function<int()> f;
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int ret;
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{
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S s;
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f = [&s] { return s.f; };
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}
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return f; // if the caller invokes the lambda, it will try to read the invalid
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// stack address
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}
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int ref_capture_return_local_lambda_ok() {
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S x;
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auto f = [&x](void) -> S& {
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// do not report this because there is a good chance that this function will
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// only be used in the local scope
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return x;
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};
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return f().f;
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}
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S& FN_ref_capture_return_local_lambda_bad() {
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S x;
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auto f = [&x](void) -> S& {
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// no way to know if ok here
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return x;
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};
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// woops, this returns a ref to a local!
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return f();
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}
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struct C {
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int val() const;
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~C();
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};
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struct D {
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void add(int v);
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~D();
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};
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void capture_multiple_vars_by_value_ok(C c, C c2) {
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auto f = [=]() -> D* {
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auto d = new D();
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d->add(c.val());
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d->add(c2.val());
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return d;
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};
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}
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