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
16template<class T>
17__attribute__((noinline))
18static 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
43TEST(AddressSanitizer, ManyAccessBenchmark) {
44 size_t kLen = 1024;
45 int *int_array = new int[kLen];
46 ManyAccessFunc(x: int_array, n_elements: kLen, n_iter: 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))
52static 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
65TEST(AddressSanitizer, BorderAccessBenchmark) {
66 char *char_7_array = new char[7];
67 BorderAccessFunc(char_7_array, 1 << 30);
68 delete [] char_7_array;
69}
70
71static void FunctionWithLargeStack() {
72 int stack[1000];
73 Ident(stack);
74}
75
76TEST(AddressSanitizer, FakeStackBenchmark) {
77 for (int i = 0; i < 10000000; i++)
78 Ident(&FunctionWithLargeStack)();
79}
80
81int main(int argc, char **argv) {
82 testing::InitGoogleTest(&argc, argv);
83 return RUN_ALL_TESTS();
84}
85

source code of compiler-rt/lib/asan/tests/asan_benchmarks_test.cpp