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// Test basic realloc functionality.
// RUN: %clang_hwasan %s -o %t
// RUN: %run %t
#include <stdlib.h>
#include <assert.h>
#include <sanitizer/hwasan_interface.h>
int main() {
__hwasan_enable_allocator_tagging();
char *x = (char*)realloc(nullptr, 4);
x[0] = 10;
x[1] = 20;
x[2] = 30;
x[3] = 40;
char *x1 = (char*)realloc(x, 5);
assert(x1 != x); // not necessary true for C,
// but true today for hwasan.
assert(x1[0] == 10 && x1[1] == 20 && x1[2] == 30 && x1[3] == 40);
x1[4] = 50;
char *x2 = (char*)realloc(x1, 6);
x2[5] = 60;
assert(x2 != x1);
assert(x2[0] == 10 && x2[1] == 20 && x2[2] == 30 && x2[3] == 40 &&
x2[4] == 50 && x2[5] == 60);
char *x3 = (char*)realloc(x2, 6);
assert(x3 != x2);
assert(x3[0] == 10 && x3[1] == 20 && x3[2] == 30 && x3[3] == 40 &&
x3[4] == 50 && x3[5] == 60);
char *x4 = (char*)realloc(x3, 5);
assert(x4 != x3);
assert(x4[0] == 10 && x4[1] == 20 && x4[2] == 30 && x4[3] == 40 &&
x4[4] == 50);
}
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