1 /*
2 * Copyright © 2020 Google, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24 #include <stdio.h>
25 #include <gtest/gtest.h>
26
27 #include "util/macros.h"
28 #include "util/u_debug_stack.h"
29
30 static void ATTRIBUTE_NOINLINE
func_a(void)31 func_a(void)
32 {
33 struct debug_stack_frame backtrace[16];
34
35 fprintf(stderr, "--- backtrace from func_a:\n");
36 debug_backtrace_capture(backtrace, 0, 16);
37 debug_backtrace_dump(backtrace, 16);
38 }
39
40 static void ATTRIBUTE_NOINLINE
func_b(void)41 func_b(void)
42 {
43 struct debug_stack_frame backtrace[16];
44
45 func_a();
46
47 fprintf(stderr, "--- backtrace from func_b:\n");
48 debug_backtrace_capture(backtrace, 0, 16);
49 debug_backtrace_dump(backtrace, 16);
50 }
51
52 static void ATTRIBUTE_NOINLINE
func_c(struct debug_stack_frame * frames)53 func_c(struct debug_stack_frame *frames)
54 {
55 debug_backtrace_capture(frames, 0, 16);
56 }
57
TEST(u_debug_stack_test,basics)58 TEST(u_debug_stack_test, basics)
59 {
60 struct debug_stack_frame backtrace[16];
61 struct debug_stack_frame stored_backtrace[16];
62
63 func_c(stored_backtrace);
64
65 fprintf(stderr, "--- backtrace from main to stderr:\n");
66 debug_backtrace_capture(backtrace, 0, 16);
67 debug_backtrace_print(stderr, backtrace, 16);
68
69 fprintf(stderr, "--- backtrace from main again to debug_printf:\n");
70 debug_backtrace_capture(backtrace, 0, 16);
71 debug_backtrace_dump(backtrace, 16);
72
73 func_a();
74
75 func_b();
76
77 fprintf(stderr, "--- stored backtrace from start of main:\n");
78 debug_backtrace_dump(stored_backtrace, 16);
79 }
80
81 #if _POSIX_C_SOURCE >= 200809L
82
TEST(u_debug_stack_test,capture_not_overwritten)83 TEST(u_debug_stack_test, capture_not_overwritten)
84 {
85 struct debug_stack_frame backtrace1[16], backtrace2[16];
86
87 FILE *fp;
88 char *bt1, *bt2;
89 size_t size;
90
91 /* Old android implementation uses one global capture per thread. Test that
92 * we can store multiple captures and that they decode to different
93 * backtraces.
94 */
95
96 func_c(backtrace1);
97 debug_backtrace_capture(backtrace2, 0, 16);
98
99 fp = open_memstream(&bt1, &size);
100 debug_backtrace_print(fp, backtrace1, 16);
101 fclose(fp);
102
103 fp = open_memstream(&bt2, &size);
104 debug_backtrace_print(fp, backtrace2, 16);
105 fclose(fp);
106
107 if (size > 0) {
108 EXPECT_STRNE(bt1, bt2);
109 }
110
111 free(bt1);
112 free(bt2);
113 }
114
115 #endif
116