1 //===-- tsan_stack_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 ThreadSanitizer (TSan), a race detector.
10 //
11 //===----------------------------------------------------------------------===//
12 #include "tsan_sync.h"
13 #include "tsan_rtl.h"
14 #include "gtest/gtest.h"
15 #include <string.h>
16
17 namespace __tsan {
18
19 template <typename StackTraceTy>
TestStackTrace(StackTraceTy * trace)20 static void TestStackTrace(StackTraceTy *trace) {
21 ThreadState thr(kMainTid);
22
23 ObtainCurrentStack(&thr, 0, trace);
24 EXPECT_EQ(0U, trace->size);
25
26 ObtainCurrentStack(&thr, 42, trace);
27 EXPECT_EQ(1U, trace->size);
28 EXPECT_EQ(42U, trace->trace[0]);
29
30 *thr.shadow_stack_pos++ = 100;
31 *thr.shadow_stack_pos++ = 101;
32 ObtainCurrentStack(&thr, 0, trace);
33 EXPECT_EQ(2U, trace->size);
34 EXPECT_EQ(100U, trace->trace[0]);
35 EXPECT_EQ(101U, trace->trace[1]);
36
37 ObtainCurrentStack(&thr, 42, trace);
38 EXPECT_EQ(3U, trace->size);
39 EXPECT_EQ(100U, trace->trace[0]);
40 EXPECT_EQ(101U, trace->trace[1]);
41 EXPECT_EQ(42U, trace->trace[2]);
42 }
43
44 template<typename StackTraceTy>
TestTrim(StackTraceTy * trace)45 static void TestTrim(StackTraceTy *trace) {
46 ThreadState thr(kMainTid);
47
48 for (uptr i = 0; i < 2 * kStackTraceMax; ++i)
49 *thr.shadow_stack_pos++ = 100 + i;
50
51 ObtainCurrentStack(&thr, 0, trace);
52 EXPECT_EQ(kStackTraceMax, trace->size);
53 for (uptr i = 0; i < kStackTraceMax; i++) {
54 EXPECT_EQ(100 + kStackTraceMax + i, trace->trace[i]);
55 }
56
57 ObtainCurrentStack(&thr, 42, trace);
58 EXPECT_EQ(kStackTraceMax, trace->size);
59 for (uptr i = 0; i < kStackTraceMax - 1; i++) {
60 EXPECT_EQ(101 + kStackTraceMax + i, trace->trace[i]);
61 }
62 EXPECT_EQ(42U, trace->trace[kStackTraceMax - 1]);
63 }
64
TEST(StackTrace,BasicVarSize)65 TEST(StackTrace, BasicVarSize) {
66 VarSizeStackTrace trace;
67 TestStackTrace(&trace);
68 }
69
TEST(StackTrace,BasicBuffered)70 TEST(StackTrace, BasicBuffered) {
71 BufferedStackTrace trace;
72 TestStackTrace(&trace);
73 }
74
TEST(StackTrace,TrimVarSize)75 TEST(StackTrace, TrimVarSize) {
76 VarSizeStackTrace trace;
77 TestTrim(&trace);
78 }
79
TEST(StackTrace,TrimBuffered)80 TEST(StackTrace, TrimBuffered) {
81 BufferedStackTrace trace;
82 TestTrim(&trace);
83 }
84
85 } // namespace __tsan
86