зеркало из https://github.com/mozilla/gecko-dev.git
63 строки
2.7 KiB
C++
63 строки
2.7 KiB
C++
#define MOZ_NONHEAP_CLASS __attribute__((annotate("moz_nonheap_class")))
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#define MOZ_STACK_CLASS __attribute__((annotate("moz_stack_class")))
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#include <stddef.h>
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struct MOZ_NONHEAP_CLASS NonHeap {
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int i;
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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_NONHEAP_CLASS TemplateClass {
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T i;
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};
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void gobble(void *) { }
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void misuseNonHeapClass(int len) {
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NonHeap valid;
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NonHeap alsoValid[2];
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static NonHeap validStatic;
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static NonHeap alsoValidStatic[2];
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gobble(&valid);
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gobble(&validStatic);
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gobble(&alsoValid[0]);
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gobble(new NonHeap); // expected-error {{variable of type 'NonHeap' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
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gobble(new NonHeap[10]); // expected-error {{variable of type 'NonHeap' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
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gobble(new TemplateClass<int>); // expected-error {{variable of type 'TemplateClass<int>' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
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gobble(len <= 5 ? &valid : new NonHeap); // expected-error {{variable of type 'NonHeap' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
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char buffer[sizeof(NonHeap)];
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gobble(new (buffer) NonHeap);
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}
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NonHeap validStatic;
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struct RandomClass {
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NonHeap nonstaticMember; // expected-note {{'RandomClass' is a non-heap type because member 'nonstaticMember' is a non-heap type 'NonHeap'}}
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static NonHeap staticMember;
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};
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struct MOZ_NONHEAP_CLASS RandomNonHeapClass {
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NonHeap nonstaticMember;
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static NonHeap staticMember;
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};
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struct BadInherit : NonHeap {}; // expected-note {{'BadInherit' is a non-heap type because it inherits from a non-heap type 'NonHeap'}}
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struct MOZ_NONHEAP_CLASS GoodInherit : NonHeap {};
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void useStuffWrongly() {
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gobble(new BadInherit); // expected-error {{variable of type 'BadInherit' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
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gobble(new RandomClass); // expected-error {{variable of type 'RandomClass' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
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}
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// Stack class overrides non-heap typees.
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struct MOZ_STACK_CLASS StackClass {};
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struct MOZ_NONHEAP_CLASS InferredStackClass : GoodInherit {
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NonHeap nonstaticMember;
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StackClass stackClass; // expected-note {{'InferredStackClass' is a stack type because member 'stackClass' is a stack type 'StackClass'}}
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};
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InferredStackClass global; // expected-error {{variable of type 'InferredStackClass' only valid on the stack}} expected-note {{value incorrectly allocated in a global variable}}
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