1 //===-- asan_benchmarks_test.cpp ---------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of AddressSanitizer, an address sanity checker.
10 //
11 // Some benchmarks for the instrumented code.
12 //===----------------------------------------------------------------------===//
13 
14 #include "asan_test_utils.h"
15 
16 template<class T>
17 __attribute__((noinline))
18 static void ManyAccessFunc(T *x, size_t n_elements, size_t n_iter) {
19   for (size_t iter = 0; iter < n_iter; iter++) {
20     break_optimization(0);
21     // hand unroll the loop to stress the reg alloc.
22     for (size_t i = 0; i <= n_elements - 16; i += 16) {
23       x[i + 0] = i;
24       x[i + 1] = i;
25       x[i + 2] = i;
26       x[i + 3] = i;
27       x[i + 4] = i;
28       x[i + 5] = i;
29       x[i + 6] = i;
30       x[i + 7] = i;
31       x[i + 8] = i;
32       x[i + 9] = i;
33       x[i + 10] = i;
34       x[i + 11] = i;
35       x[i + 12] = i;
36       x[i + 13] = i;
37       x[i + 14] = i;
38       x[i + 15] = i;
39     }
40   }
41 }
42 
43 TEST(AddressSanitizer, ManyAccessBenchmark) {
44   size_t kLen = 1024;
45   int *int_array = new int[kLen];
46   ManyAccessFunc(int_array, kLen, 1 << 24);
47   delete [] int_array;
48 }
49 
50 // access 7 char elements in a 7 byte array (i.e. on the border).
51 __attribute__((noinline))
52 static void BorderAccessFunc(char *x, size_t n_iter) {
53   for (size_t iter = 0; iter < n_iter; iter++) {
54     break_optimization(x);
55     x[0] = 0;
56     x[1] = 0;
57     x[2] = 0;
58     x[3] = 0;
59     x[4] = 0;
60     x[5] = 0;
61     x[6] = 0;
62   }
63 }
64 
65 TEST(AddressSanitizer, BorderAccessBenchmark) {
66   char *char_7_array = new char[7];
67   BorderAccessFunc(char_7_array, 1 << 30);
68   delete [] char_7_array;
69 }
70 
71 static void FunctionWithLargeStack() {
72   int stack[1000];
73   Ident(stack);
74 }
75 
76 TEST(AddressSanitizer, FakeStackBenchmark) {
77   for (int i = 0; i < 10000000; i++)
78     Ident(&FunctionWithLargeStack)();
79 }
80 
81 int main(int argc, char **argv) {
82   testing::InitGoogleTest(&argc, argv);
83   return RUN_ALL_TESTS();
84 }
85