1//===-- common_test.cpp -----------------------------------------*- C++ -*-===//
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#include "internal_defs.h"
10#include "tests/scudo_unit_test.h"
11
12#include "common.h"
13#include "mem_map.h"
14#include <algorithm>
15#include <fstream>
16
17namespace scudo {
18
19static uptr getResidentMemorySize() {
20 if (!SCUDO_LINUX)
21 UNREACHABLE("Not implemented!");
22 uptr Size;
23 uptr Resident;
24 std::ifstream IFS("/proc/self/statm");
25 IFS >> Size;
26 IFS >> Resident;
27 return Resident * getPageSizeCached();
28}
29
30// Fuchsia needs getResidentMemorySize implementation.
31TEST(ScudoCommonTest, SKIP_ON_FUCHSIA(ResidentMemorySize)) {
32 uptr OnStart = getResidentMemorySize();
33 EXPECT_GT(OnStart, 0UL);
34
35 const uptr Size = 1ull << 30;
36 const uptr Threshold = Size >> 3;
37
38 MemMapT MemMap;
39 ASSERT_TRUE(MemMap.map(/*Addr=*/0U, Size, "ResidentMemorySize"));
40 ASSERT_NE(MemMap.getBase(), 0U);
41 void *P = reinterpret_cast<void *>(MemMap.getBase());
42 EXPECT_LT(getResidentMemorySize(), OnStart + Threshold);
43
44 memset(P, 1, Size);
45 EXPECT_GT(getResidentMemorySize(), OnStart + Size - Threshold);
46
47 MemMap.releasePagesToOS(MemMap.getBase(), Size);
48 EXPECT_LT(getResidentMemorySize(), OnStart + Threshold);
49
50 memset(P, 1, Size);
51 EXPECT_GT(getResidentMemorySize(), OnStart + Size - Threshold);
52
53 MemMap.unmap();
54}
55
56TEST(ScudoCommonTest, Zeros) {
57 const uptr Size = 1ull << 20;
58
59 MemMapT MemMap;
60 ASSERT_TRUE(MemMap.map(/*Addr=*/0U, Size, Name: "Zeros"));
61 ASSERT_NE(MemMap.getBase(), 0U);
62 uptr *P = reinterpret_cast<uptr *>(MemMap.getBase());
63 const ptrdiff_t N = Size / sizeof(uptr);
64 EXPECT_EQ(std::count(P, P + N, 0), N);
65
66 memset(s: P, c: 1, n: Size);
67 EXPECT_EQ(std::count(P, P + N, 0), 0);
68
69 MemMap.releasePagesToOS(From: MemMap.getBase(), Size);
70 EXPECT_EQ(std::count(P, P + N, 0), N);
71
72 MemMap.unmap();
73}
74
75} // namespace scudo
76

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source code of compiler-rt/lib/scudo/standalone/tests/common_test.cpp