Mirror of roytam1's UXP fork just in case Moonchild and Tobin decide to go after him
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#define MOZ_NONHEAP_CLASS __attribute__((annotate("moz_nonheap_class")))
#define MOZ_STACK_CLASS __attribute__((annotate("moz_stack_class")))
#include <stddef.h>
struct MOZ_NONHEAP_CLASS NonHeap {
int i;
void *operator new(size_t x) throw() { return 0; }
void *operator new(size_t blah, char *buffer) { return buffer; }
};
template <class T>
struct MOZ_NONHEAP_CLASS TemplateClass {
T i;
};
void gobble(void *) { }
void misuseNonHeapClass(int len) {
NonHeap valid;
NonHeap alsoValid[2];
static NonHeap validStatic;
static NonHeap alsoValidStatic[2];
gobble(&valid);
gobble(&validStatic);
gobble(&alsoValid[0]);
gobble(new NonHeap); // expected-error {{variable of type 'NonHeap' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
gobble(new NonHeap[10]); // expected-error {{variable of type 'NonHeap' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
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}}
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}}
char buffer[sizeof(NonHeap)];
gobble(new (buffer) NonHeap);
}
NonHeap validStatic;
struct RandomClass {
NonHeap nonstaticMember; // expected-note {{'RandomClass' is a non-heap type because member 'nonstaticMember' is a non-heap type 'NonHeap'}}
static NonHeap staticMember;
};
struct MOZ_NONHEAP_CLASS RandomNonHeapClass {
NonHeap nonstaticMember;
static NonHeap staticMember;
};
struct BadInherit : NonHeap {}; // expected-note {{'BadInherit' is a non-heap type because it inherits from a non-heap type 'NonHeap'}}
struct MOZ_NONHEAP_CLASS GoodInherit : NonHeap {};
void useStuffWrongly() {
gobble(new BadInherit); // expected-error {{variable of type 'BadInherit' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
gobble(new RandomClass); // expected-error {{variable of type 'RandomClass' is not valid on the heap}} expected-note {{value incorrectly allocated on the heap}}
}
// Stack class overrides non-heap typees.
struct MOZ_STACK_CLASS StackClass {};
struct MOZ_NONHEAP_CLASS InferredStackClass : GoodInherit {
NonHeap nonstaticMember;
StackClass stackClass; // expected-note {{'InferredStackClass' is a stack type because member 'stackClass' is a stack type 'StackClass'}}
};
InferredStackClass global; // expected-error {{variable of type 'InferredStackClass' only valid on the stack}} expected-note {{value incorrectly allocated in a global variable}}