зеркало из https://github.com/mozilla/gecko-dev.git
73 строки
3.5 KiB
C++
73 строки
3.5 KiB
C++
#define MOZ_TEMPORARY_CLASS __attribute__((annotate("moz_temporary_class")))
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#define MOZ_IMPLICIT __attribute__((annotate("moz_implicit")))
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#include <stddef.h>
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struct MOZ_TEMPORARY_CLASS Temporary {
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int i;
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Temporary() {}
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MOZ_IMPLICIT Temporary(int a) {}
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Temporary(int a, int b) {}
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void *operator new(size_t x) throw() { return 0; }
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void *operator new(size_t blah, char *buffer) { return buffer; }
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};
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template <class T>
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struct MOZ_TEMPORARY_CLASS TemplateClass {
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T i;
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};
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void gobble(void *) { }
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void gobbleref(const Temporary&) { }
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template <class T>
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void gobbleanyref(const T&) { }
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void misuseNonTemporaryClass(int len) {
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// All of these should error.
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Temporary invalid; // expected-error {{variable of type 'Temporary' is only valid as a temporary}} expected-note {{value incorrectly allocated in an automatic variable}}
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Temporary alsoInvalid[2]; // expected-error {{variable of type 'Temporary [2]' is only valid as a temporary}} expected-note {{value incorrectly allocated in an automatic variable}} expected-note {{'Temporary [2]' is a temporary type because it is an array of temporary type 'Temporary'}}
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static Temporary invalidStatic; // expected-error {{variable of type 'Temporary' is only valid as a temporary}} expected-note {{value incorrectly allocated in a global variable}}
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static Temporary alsoInvalidStatic[2]; // expected-error {{variable of type 'Temporary [2]' is only valid as a temporary}} expected-note {{value incorrectly allocated in a global variable}} expected-note {{'Temporary [2]' is a temporary type because it is an array of temporary type 'Temporary'}}
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gobble(&invalid);
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gobble(&invalidStatic);
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gobble(&alsoInvalid[0]);
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// All of these should be fine.
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gobbleref(Temporary());
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gobbleref(Temporary(10, 20));
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gobbleref(Temporary(10));
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gobbleref(10);
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gobbleanyref(TemplateClass<int>());
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// All of these should error.
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gobble(new Temporary); // expected-error {{variable of type 'Temporary' is only valid as a temporary}} expected-note {{value incorrectly allocated on the heap}}
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gobble(new Temporary[10]); // expected-error {{variable of type 'Temporary' is only valid as a temporary}} expected-note {{value incorrectly allocated on the heap}}
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gobble(new TemplateClass<int>); // expected-error {{variable of type 'TemplateClass<int>' is only valid as a temporary}} expected-note {{value incorrectly allocated on the heap}}
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gobble(len <= 5 ? &invalid : new Temporary); // expected-error {{variable of type 'Temporary' is only valid as a temporary}} expected-note {{value incorrectly allocated on the heap}}
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// Placement new is odd, but okay.
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char buffer[sizeof(Temporary)];
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gobble(new (buffer) Temporary);
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}
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void defaultArg(const Temporary& arg = Temporary()) { // expected-error {{variable of type 'Temporary' is only valid as a temporary}} expected-note {{value incorrectly allocated in an automatic variable}}
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}
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// Can't be a global, this should error.
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Temporary invalidStatic; // expected-error {{variable of type 'Temporary' is only valid as a temporary}} expected-note {{value incorrectly allocated in a global variable}}
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struct RandomClass {
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Temporary nonstaticMember; // This is okay if RandomClass is only used as a temporary.
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static Temporary staticMember; // expected-error {{variable of type 'Temporary' is only valid as a temporary}} expected-note {{value incorrectly allocated in a global variable}}
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};
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struct BadInherit : Temporary {};
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void useStuffWrongly() {
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gobbleanyref(BadInherit());
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gobbleanyref(RandomClass());
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}
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