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75 lines
1.4 KiB
75 lines
1.4 KiB
/*
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* Copyright (c) 2017 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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bool star();
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class T {
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public:
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int x;
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T* field;
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public:
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int* _Nullable mayReturnNullPointer() {
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if (star()) {
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return nullptr;
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} else {
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return new int;
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}
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}
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public:
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T* _Nullable mayReturnNullObject() {
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if (star()) {
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return nullptr;
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} else {
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return this;
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}
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}
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public:
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void doSomething() {}
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};
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void assignNullableValueBad(T* t) {
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int* p = t->mayReturnNullPointer();
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*p = 42;
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}
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void FP_reAssigningNullableValueOk(T* t) {
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int* p = t->mayReturnNullPointer();
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p = new int;
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*p = 42;
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}
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void callMethodOnNullableObjectBad(T* t) {
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t->mayReturnNullObject()->doSomething();
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}
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void callMethodOnNullableObjectOk(T* t) {
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T* p = t->mayReturnNullObject();
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if (p != nullptr) {
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p->doSomething();
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}
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}
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void dereferenceFieldOfNullableObjectBad(T* t) {
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T* p = t->mayReturnNullObject();
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p->x = 42;
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}
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void methodCallOnFieldOfNullableObjectBad(T* t) {
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T* p = t->mayReturnNullObject();
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p->field->doSomething();
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}
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void avoidDoubleReportingBad(T* t) {
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T* p = t->mayReturnNullObject();
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p->doSomething(); // should report here
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p->doSomething(); // should not report here
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}
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