1 /* Copyright (c) 2014-2023. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "src/3rd-party/catch.hpp"
7 #include "src/mc/mc_config.hpp"
8 #include "src/mc/sosp/Snapshot.hpp"
13 #include <xbt/random.hpp>
15 class snap_test_helper {
16 simgrid::mc::PageStore page_store_{500};
17 simgrid::mc::RemoteProcessMemory memory_{getpid(), nullptr};
19 struct prologue_return {
23 std::unique_ptr<simgrid::mc::Region> region0;
24 std::unique_ptr<simgrid::mc::Region> region;
26 prologue_return prologue(int n); // common to the below 5 fxs
28 static void init_memory(std::byte* mem, size_t size);
31 void read_whole_region();
32 void read_region_parts();
33 void compare_whole_region();
34 void compare_region_parts();
37 static void basic_requirements();
40 void snap_test_helper::init_memory(std::byte* mem, size_t size)
42 std::generate_n(mem, size, []() { return static_cast<std::byte>(simgrid::xbt::random::uniform_int(0, 0xff)); });
45 void snap_test_helper::basic_requirements()
47 REQUIRE(xbt_pagesize == getpagesize());
48 REQUIRE(1 << xbt_pagebits == xbt_pagesize);
51 snap_test_helper::prologue_return snap_test_helper::prologue(int n)
53 // Store region page(s):
54 size_t byte_size = n * xbt_pagesize;
56 static_cast<std::byte*>(mmap(nullptr, byte_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
57 INFO("Could not allocate source memory");
58 REQUIRE(source != MAP_FAILED);
60 // Init memory and take snapshots:
61 init_memory(source, byte_size);
63 std::make_unique<simgrid::mc::Region>(page_store_, memory_, simgrid::mc::RegionType::Data, source, byte_size);
64 for (int i = 0; i < n; i += 2) {
65 init_memory(source + i * xbt_pagesize, xbt_pagesize);
68 std::make_unique<simgrid::mc::Region>(page_store_, memory_, simgrid::mc::RegionType::Data, source, byte_size);
71 static_cast<std::byte*>(mmap(nullptr, byte_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
72 INFO("Could not allocate destination memory");
73 REQUIRE(destination != MAP_FAILED);
75 return {.size = byte_size,
78 .region0 = std::move(region0),
79 .region = std::move(region)};
82 void snap_test_helper::read_whole_region()
84 for (int n = 1; n != 32; ++n) {
85 prologue_return ret = prologue(n);
86 const void* read = ret.region->read(ret.dstn, ret.src, ret.size);
87 INFO("Mismatch in MC_region_read()");
88 REQUIRE(not memcmp(ret.src, read, ret.size));
90 munmap(ret.dstn, ret.size);
91 munmap(ret.src, ret.size);
95 void snap_test_helper::read_region_parts()
97 for (int n = 1; n != 32; ++n) {
98 prologue_return ret = prologue(n);
100 for (int j = 0; j != 100; ++j) {
101 size_t offset = simgrid::xbt::random::uniform_int(0, ret.size - 1);
102 size_t size = simgrid::xbt::random::uniform_int(0, ret.size - offset - 1);
103 const void* read = ret.region->read(ret.dstn, (const char*)ret.src + offset, size);
104 INFO("Mismatch in MC_region_read()");
105 REQUIRE(not memcmp((char*)ret.src + offset, read, size));
107 munmap(ret.dstn, ret.size);
108 munmap(ret.src, ret.size);
112 void snap_test_helper::compare_whole_region()
114 for (int n = 1; n != 32; ++n) {
115 prologue_return ret = prologue(n);
117 INFO("Unexpected match in MC_snapshot_region_memcmp() with previous snapshot");
118 REQUIRE(MC_snapshot_region_memcmp(ret.src, ret.region0.get(), ret.src, ret.region.get(), ret.size));
120 munmap(ret.dstn, ret.size);
121 munmap(ret.src, ret.size);
125 void snap_test_helper::compare_region_parts()
127 for (int n = 1; n != 32; ++n) {
128 prologue_return ret = prologue(n);
130 for (int j = 0; j != 100; ++j) {
131 size_t offset = simgrid::xbt::random::uniform_int(0, ret.size - 1);
132 size_t size = simgrid::xbt::random::uniform_int(0, ret.size - offset - 1);
134 INFO("Mismatch in MC_snapshot_region_memcmp()");
135 REQUIRE(not MC_snapshot_region_memcmp((char*)ret.src + offset, ret.region.get(), (char*)ret.src + offset,
136 ret.region.get(), size));
138 munmap(ret.dstn, ret.size);
139 munmap(ret.src, ret.size);
143 const int some_global_variable = 42;
144 const void* const some_global_pointer = &some_global_variable;
145 void snap_test_helper::read_pointer()
147 prologue_return ret = prologue(1);
148 memcpy(ret.src, &some_global_pointer, sizeof(void*));
149 const simgrid::mc::Region region2(page_store_, memory_, simgrid::mc::RegionType::Data, ret.src, ret.size);
150 INFO("Mismtach in MC_region_read_pointer()");
151 REQUIRE(MC_region_read_pointer(®ion2, ret.src) == some_global_pointer);
153 munmap(ret.dstn, ret.size);
154 munmap(ret.src, ret.size);
157 /*************** End: class snap_test_helper *****************************/
159 TEST_CASE("MC::Snapshot: A copy/snapshot of a given memory region", "MC::Snapshot")
161 INFO("Sparse snapshot (using pages)");
163 snap_test_helper::basic_requirements();
165 snap_test_helper snap_test;
167 INFO("Read whole region");
168 snap_test.read_whole_region();
170 INFO("Read region parts");
171 snap_test.read_region_parts();
173 INFO("Compare whole region");
174 snap_test.compare_whole_region();
176 INFO("Compare region parts");
177 snap_test.compare_region_parts();
179 INFO("Read pointer");
180 snap_test.read_pointer();