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// Test that malloc_zone_from_ptr returns a valid zone for a 0-sized allocation.
// RUN: %clang_tsan %s -o %t -framework Foundation
// RUN: %run %t 2>&1 | FileCheck %s
#include <malloc/malloc.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
int some_global;
void describe_zone(void *p) {
malloc_zone_t *z = malloc_zone_from_ptr(p);
if (z) {
fprintf(stderr, "zone = %p\n", z);
} else {
fprintf(stderr, "zone = no zone\n");
}
}
int main() {
void *p;
size_t s;
p = malloc(0x40);
s = malloc_size(p);
fprintf(stderr, "size = 0x%zx\n", s);
// CHECK: size = 0x40
describe_zone(p);
// CHECK: zone = 0x{{[0-9a-f]+}}
p = malloc(0);
s = malloc_size(p);
fprintf(stderr, "size = 0x%zx\n", s);
// CHECK: size = 0x1
describe_zone(p);
// CHECK: zone = 0x{{[0-9a-f]+}}
p = &some_global;
s = malloc_size(p);
fprintf(stderr, "size = 0x%zx\n", s);
// CHECK: size = 0x0
describe_zone(p);
// CHECK: zone = no zone
p = mmap(0, 0x1000, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
if (!p) {
fprintf(stderr, "mmap failed\n");
exit(1);
}
s = malloc_size(p);
fprintf(stderr, "size = 0x%zx\n", s);
// CHECK: size = 0x0
describe_zone(p);
// CHECK: zone = no zone
}
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