502 lines
14 KiB
Plaintext
502 lines
14 KiB
Plaintext
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// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime-has-weak -fobjc-arc -fblocks -Wno-objc-root-class -std=c++11 -Warc-repeated-use-of-weak -verify %s
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// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime-has-weak -fobjc-weak -fblocks -Wno-objc-root-class -std=c++11 -Warc-repeated-use-of-weak -verify %s
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@interface Test {
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@public
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Test *ivar;
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__weak id weakIvar;
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}
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@property(weak) Test *weakProp;
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@property(strong) Test *strongProp;
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- (__weak id)implicitProp;
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+ (__weak id)weakProp;
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@end
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extern void use(id);
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extern id get();
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extern bool condition();
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#define nil ((id)0)
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void sanity(Test *a) {
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use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times in this function but may be unpredictably set to nil; assign to a strong variable to keep the object alive}}
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use(a.weakProp); // expected-note{{also accessed here}}
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use(a.strongProp);
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use(a.strongProp); // no-warning
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use(a.weakProp); // expected-note{{also accessed here}}
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}
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void singleUse(Test *a) {
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use(a.weakProp); // no-warning
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use(a.strongProp); // no-warning
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}
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void assignsOnly(Test *a) {
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a.weakProp = get(); // no-warning
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id next = get();
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if (next)
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a.weakProp = next; // no-warning
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a->weakIvar = get(); // no-warning
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next = get();
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if (next)
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a->weakIvar = next; // no-warning
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extern __weak id x;
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x = get(); // no-warning
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next = get();
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if (next)
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x = next; // no-warning
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}
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void assignThenRead(Test *a) {
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a.weakProp = get(); // expected-note{{also accessed here}}
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use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
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}
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void twoVariables(Test *a, Test *b) {
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use(a.weakProp); // no-warning
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use(b.weakProp); // no-warning
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}
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void doubleLevelAccess(Test *a) {
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use(a.strongProp.weakProp); // expected-warning{{weak property 'weakProp' may be accessed multiple times in this function and may be unpredictably set to nil; assign to a strong variable to keep the object alive}}
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use(a.strongProp.weakProp); // expected-note{{also accessed here}}
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}
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void doubleLevelAccessIvar(Test *a) {
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use(a.strongProp.weakProp); // expected-warning{{weak property 'weakProp' may be accessed multiple times}}
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use(a.strongProp.weakProp); // expected-note{{also accessed here}}
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}
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void implicitProperties(Test *a) {
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use(a.implicitProp); // expected-warning{{weak implicit property 'implicitProp' is accessed multiple times}}
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use(a.implicitProp); // expected-note{{also accessed here}}
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}
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void classProperties() {
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use(Test.weakProp); // expected-warning{{weak implicit property 'weakProp' is accessed multiple times}}
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use(Test.weakProp); // expected-note{{also accessed here}}
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}
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void classPropertiesAreDifferent(Test *a) {
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use(Test.weakProp); // no-warning
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use(a.weakProp); // no-warning
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use(a.strongProp.weakProp); // no-warning
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}
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void ivars(Test *a) {
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use(a->weakIvar); // expected-warning{{weak instance variable 'weakIvar' is accessed multiple times}}
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use(a->weakIvar); // expected-note{{also accessed here}}
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}
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void globals() {
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extern __weak id a;
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use(a); // expected-warning{{weak variable 'a' is accessed multiple times}}
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use(a); // expected-note{{also accessed here}}
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}
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void messageGetter(Test *a) {
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use([a weakProp]); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
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use([a weakProp]); // expected-note{{also accessed here}}
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}
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void messageSetter(Test *a) {
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[a setWeakProp:get()]; // no-warning
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[a setWeakProp:get()]; // no-warning
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}
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void messageSetterAndGetter(Test *a) {
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[a setWeakProp:get()]; // expected-note{{also accessed here}}
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use([a weakProp]); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
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}
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void mixDotAndMessageSend(Test *a, Test *b) {
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use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
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use([a weakProp]); // expected-note{{also accessed here}}
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use([b weakProp]); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
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use(b.weakProp); // expected-note{{also accessed here}}
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}
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void assignToStrongWrongInit(Test *a) {
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id val = a.weakProp; // expected-note{{also accessed here}}
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use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
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}
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void assignToStrongWrong(Test *a) {
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id val;
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val = a.weakProp; // expected-note{{also accessed here}}
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use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
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}
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void assignToIvarWrong(Test *a) {
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a->weakIvar = get(); // expected-note{{also accessed here}}
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use(a->weakIvar); // expected-warning{{weak instance variable 'weakIvar' is accessed multiple times}}
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}
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void assignToGlobalWrong() {
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extern __weak id a;
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a = get(); // expected-note{{also accessed here}}
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use(a); // expected-warning{{weak variable 'a' is accessed multiple times}}
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}
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void assignToStrongOK(Test *a) {
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if (condition()) {
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id val = a.weakProp; // no-warning
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(void)val;
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} else {
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id val;
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val = a.weakProp; // no-warning
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(void)val;
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}
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}
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void assignToStrongConditional(Test *a) {
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id val = (condition() ? a.weakProp : a.weakProp); // no-warning
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id val2 = a.implicitProp ?: a.implicitProp; // no-warning
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}
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void testBlock(Test *a) {
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use(a.weakProp); // no-warning
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use(^{
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use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times in this block}}
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use(a.weakProp); // expected-note{{also accessed here}}
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});
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}
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void assignToStrongWithCasts(Test *a) {
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if (condition()) {
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Test *val = (Test *)a.weakProp; // no-warning
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(void)val;
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} else {
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id val;
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val = (Test *)a.weakProp; // no-warning
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(void)val;
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}
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}
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void assignToStrongWithMessages(Test *a) {
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if (condition()) {
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id val = [a weakProp]; // no-warning
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(void)val;
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} else {
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id val;
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val = [a weakProp]; // no-warning
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(void)val;
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}
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}
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void assignAfterRead(Test *a) {
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// Special exception for a single read before any writes.
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if (!a.weakProp) // no-warning
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a.weakProp = get(); // no-warning
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}
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void readOnceWriteMany(Test *a) {
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if (!a.weakProp) { // no-warning
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a.weakProp = get(); // no-warning
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a.weakProp = get(); // no-warning
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}
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}
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void readOnceAfterWrite(Test *a) {
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a.weakProp = get(); // expected-note{{also accessed here}}
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if (!a.weakProp) { // expected-warning{{weak property 'weakProp' is accessed multiple times in this function}}
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a.weakProp = get(); // expected-note{{also accessed here}}
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}
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}
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void readOnceWriteManyLoops(Test *a, Test *b, Test *c, Test *d, Test *e) {
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while (condition()) {
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if (!a.weakProp) { // expected-warning{{weak property 'weakProp' is accessed multiple times in this function}}
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a.weakProp = get(); // expected-note{{also accessed here}}
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a.weakProp = get(); // expected-note{{also accessed here}}
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}
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}
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do {
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if (!b.weakProp) { // expected-warning{{weak property 'weakProp' is accessed multiple times in this function}}
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b.weakProp = get(); // expected-note{{also accessed here}}
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b.weakProp = get(); // expected-note{{also accessed here}}
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}
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} while (condition());
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for (id x = get(); x; x = get()) {
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if (!c.weakProp) { // expected-warning{{weak property 'weakProp' is accessed multiple times in this function}}
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c.weakProp = get(); // expected-note{{also accessed here}}
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c.weakProp = get(); // expected-note{{also accessed here}}
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}
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}
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for (id x in get()) {
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if (!d.weakProp) { // expected-warning{{weak property 'weakProp' is accessed multiple times in this function}}
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d.weakProp = get(); // expected-note{{also accessed here}}
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d.weakProp = get(); // expected-note{{also accessed here}}
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}
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}
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int array[] = { 1, 2, 3 };
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for (int i : array) {
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if (!e.weakProp) { // expected-warning{{weak property 'weakProp' is accessed multiple times in this function}}
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e.weakProp = get(); // expected-note{{also accessed here}}
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e.weakProp = get(); // expected-note{{also accessed here}}
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}
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}
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}
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void readOnlyLoop(Test *a) {
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while (condition()) {
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use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times in this function}}
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}
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}
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void readInIterationLoop() {
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for (Test *a in get())
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use(a.weakProp); // no-warning
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}
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void readDoubleLevelAccessInLoop() {
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for (Test *a in get()) {
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use(a.strongProp.weakProp); // no-warning
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}
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}
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void readParameterInLoop(Test *a) {
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for (id unused in get()) {
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use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times in this function}}
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(void)unused;
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}
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}
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void readGlobalInLoop() {
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static __weak id a;
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for (id unused in get()) {
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use(a); // expected-warning{{weak variable 'a' is accessed multiple times in this function}}
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(void)unused;
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}
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}
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void doWhileLoop(Test *a) {
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do {
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use(a.weakProp); // no-warning
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} while(0);
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}
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@interface Test (Methods)
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@end
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@implementation Test (Methods)
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- (void)sanity {
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use(self.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times in this method but may be unpredictably set to nil; assign to a strong variable to keep the object alive}}
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use(self.weakProp); // expected-note{{also accessed here}}
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}
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- (void)ivars {
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use(weakIvar); // expected-warning{{weak instance variable 'weakIvar' is accessed multiple times in this method but may be unpredictably set to nil; assign to a strong variable to keep the object alive}}
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use(weakIvar); // expected-note{{also accessed here}}
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}
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- (void)doubleLevelAccessForSelf {
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use(self.strongProp.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
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use(self.strongProp.weakProp); // expected-note{{also accessed here}}
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use(self->ivar.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
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use(self->ivar.weakProp); // expected-note{{also accessed here}}
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use(self->ivar->weakIvar); // expected-warning{{weak instance variable 'weakIvar' is accessed multiple times}}
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use(self->ivar->weakIvar); // expected-note{{also accessed here}}
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}
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- (void)distinctFromOther:(Test *)other {
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use(self.strongProp.weakProp); // no-warning
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use(other.strongProp.weakProp); // no-warning
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use(self->ivar.weakProp); // no-warning
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use(other->ivar.weakProp); // no-warning
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use(self.strongProp->weakIvar); // no-warning
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use(other.strongProp->weakIvar); // no-warning
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}
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@end
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@interface Base1
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@end
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@interface Sub1 : Base1
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@end
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@interface Sub1(cat)
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-(id)prop;
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@end
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void test1(Sub1 *s) {
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use([s prop]);
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use([s prop]);
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}
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@interface Base1(cat)
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@property (weak) id prop;
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@end
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void test2(Sub1 *s) {
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// This does not warn because the "prop" in "Base1(cat)" was introduced
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// after the method declaration and we don't find it as overridden.
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// Always looking for overridden methods after the method declaration is expensive
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// and it's not clear it is worth it currently.
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use([s prop]);
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use([s prop]);
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}
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class Wrapper {
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Test *a;
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public:
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void fields() {
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use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times in this function but may be unpredictably set to nil; assign to a strong variable to keep the object alive}}
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use(a.weakProp); // expected-note{{also accessed here}}
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}
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void distinctFromOther(Test *b, const Wrapper &w) {
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use(a.weakProp); // no-warning
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use(b.weakProp); // no-warning
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use(w.a.weakProp); // no-warning
|
||
|
|
}
|
||
|
|
|
||
|
|
static void doubleLevelAccessField(const Wrapper &x, const Wrapper &y) {
|
||
|
|
use(x.a.weakProp); // expected-warning{{weak property 'weakProp' may be accessed multiple times}}
|
||
|
|
use(y.a.weakProp); // expected-note{{also accessed here}}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
// -----------------------
|
||
|
|
// False positives
|
||
|
|
// -----------------------
|
||
|
|
|
||
|
|
// Most of these would require flow-sensitive analysis to silence correctly.
|
||
|
|
|
||
|
|
void assignNil(Test *a) {
|
||
|
|
if (condition())
|
||
|
|
a.weakProp = nil; // expected-note{{also accessed here}}
|
||
|
|
|
||
|
|
use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
|
||
|
|
}
|
||
|
|
|
||
|
|
void branch(Test *a) {
|
||
|
|
if (condition())
|
||
|
|
use(a.weakProp); // expected-warning{{weak property 'weakProp' is accessed multiple times}}
|
||
|
|
else
|
||
|
|
use(a.weakProp); // expected-note{{also accessed here}}
|
||
|
|
}
|
||
|
|
|
||
|
|
void doubleLevelAccess(Test *a, Test *b) {
|
||
|
|
use(a.strongProp.weakProp); // expected-warning{{weak property 'weakProp' may be accessed multiple times}}
|
||
|
|
use(b.strongProp.weakProp); // expected-note{{also accessed here}}
|
||
|
|
|
||
|
|
use(a.weakProp.weakProp); // no-warning
|
||
|
|
}
|
||
|
|
|
||
|
|
void doubleLevelAccessIvar(Test *a, Test *b) {
|
||
|
|
use(a->ivar.weakProp); // expected-warning{{weak property 'weakProp' may be accessed multiple times}}
|
||
|
|
use(b->ivar.weakProp); // expected-note{{also accessed here}}
|
||
|
|
|
||
|
|
use(a.strongProp.weakProp); // no-warning
|
||
|
|
}
|
||
|
|
|
||
|
|
// rdar://13942025
|
||
|
|
@interface X
|
||
|
|
@end
|
||
|
|
|
||
|
|
@implementation X
|
||
|
|
- (int) warningAboutWeakVariableInsideTypeof {
|
||
|
|
__typeof__(self) __weak weakSelf = self;
|
||
|
|
^(){
|
||
|
|
__typeof__(weakSelf) blockSelf = weakSelf;
|
||
|
|
use(blockSelf);
|
||
|
|
}();
|
||
|
|
return sizeof(weakSelf);
|
||
|
|
}
|
||
|
|
@end
|
||
|
|
|
||
|
|
// rdar://19053620
|
||
|
|
@interface NSNull
|
||
|
|
+ (NSNull *)null;
|
||
|
|
@end
|
||
|
|
|
||
|
|
@interface INTF @end
|
||
|
|
|
||
|
|
@implementation INTF
|
||
|
|
- (void) Meth : (id) data
|
||
|
|
{
|
||
|
|
data = data ?: NSNull.null;
|
||
|
|
}
|
||
|
|
@end
|
||
|
|
|
||
|
|
// This used to crash in WeakObjectProfileTy::getBaseInfo when getBase() was
|
||
|
|
// called on an ObjCPropertyRefExpr object whose receiver was an interface.
|
||
|
|
|
||
|
|
@class NSString;
|
||
|
|
@interface NSBundle
|
||
|
|
+(NSBundle *)foo;
|
||
|
|
@property (class, strong) NSBundle *foo2;
|
||
|
|
@property (strong) NSString *prop;
|
||
|
|
@property(weak) NSString *weakProp;
|
||
|
|
@end
|
||
|
|
|
||
|
|
@interface NSBundle2 : NSBundle
|
||
|
|
@end
|
||
|
|
|
||
|
|
void foo() {
|
||
|
|
NSString * t = NSBundle.foo.prop;
|
||
|
|
use(NSBundle.foo.weakProp); // expected-warning{{weak property 'weakProp' may be accessed multiple times}}
|
||
|
|
use(NSBundle2.foo.weakProp); // expected-note{{also accessed here}}
|
||
|
|
|
||
|
|
NSString * t2 = NSBundle.foo2.prop;
|
||
|
|
use(NSBundle.foo2.weakProp); // expected-warning{{weak property 'weakProp' may be accessed multiple times}}
|
||
|
|
use(NSBundle2.foo2.weakProp); // expected-note{{also accessed here}}
|
||
|
|
decltype([NSBundle2.foo2 weakProp]) t3;
|
||
|
|
decltype(NSBundle2.foo2.weakProp) t4;
|
||
|
|
__typeof__(NSBundle2.foo2.weakProp) t5;
|
||
|
|
}
|
||
|
|
|
||
|
|
// This used to crash in the constructor of WeakObjectProfileTy when a
|
||
|
|
// DeclRefExpr was passed that didn't reference a VarDecl.
|
||
|
|
|
||
|
|
typedef INTF * INTFPtrTy;
|
||
|
|
|
||
|
|
enum E {
|
||
|
|
e1
|
||
|
|
};
|
||
|
|
|
||
|
|
void foo1() {
|
||
|
|
INTFPtrTy tmp = (INTFPtrTy)e1;
|
||
|
|
#if __has_feature(objc_arc)
|
||
|
|
// expected-error@-2{{cast of 'E' to 'INTFPtrTy' (aka 'INTF *') is disallowed with ARC}}
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
@class NSString;
|
||
|
|
static NSString* const kGlobal = @"";
|
||
|
|
|
||
|
|
@interface NSDictionary
|
||
|
|
- (id)objectForKeyedSubscript:(id)key;
|
||
|
|
@end
|
||
|
|
|
||
|
|
@interface WeakProp
|
||
|
|
@property (weak) NSDictionary *nd;
|
||
|
|
@end
|
||
|
|
|
||
|
|
@implementation WeakProp
|
||
|
|
-(void)m {
|
||
|
|
(void)self.nd[@""]; // no warning
|
||
|
|
}
|
||
|
|
@end
|