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 BOOST_tests *************************/
16 using simgrid::mc::Region;
17 class snap_test_helper {
18 simgrid::mc::PageStore page_store_{500};
19 simgrid::mc::RemoteProcessMemory memory_{getpid(), nullptr};
21 struct prologue_return {
25 std::unique_ptr<Region> region0;
26 std::unique_ptr<Region> region;
28 prologue_return prologue(int n); // common to the below 5 fxs
31 void read_whole_region();
32 void read_region_parts();
33 void compare_whole_region();
34 void compare_region_parts();
37 static void init_memory(std::byte* mem, size_t size);
38 static void basic_requirements();
41 void snap_test_helper::init_memory(std::byte* mem, size_t size)
43 std::generate_n(mem, size, []() { return static_cast<std::byte>(simgrid::xbt::random::uniform_int(0, 0xff)); });
46 void snap_test_helper::basic_requirements()
48 REQUIRE(xbt_pagesize == getpagesize());
49 REQUIRE(1 << xbt_pagebits == xbt_pagesize);
52 snap_test_helper::prologue_return snap_test_helper::prologue(int n)
54 // Store region page(s):
55 size_t byte_size = n * xbt_pagesize;
57 static_cast<std::byte*>(mmap(nullptr, byte_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
58 INFO("Could not allocate source memory");
59 REQUIRE(source != MAP_FAILED);
61 // Init memory and take snapshots:
62 init_memory(source, byte_size);
64 std::make_unique<simgrid::mc::Region>(page_store_, memory_, simgrid::mc::RegionType::Data, source, byte_size);
65 for (int i = 0; i < n; i += 2) {
66 init_memory(source + i * xbt_pagesize, xbt_pagesize);
69 std::make_unique<simgrid::mc::Region>(page_store_, memory_, simgrid::mc::RegionType::Data, source, byte_size);
72 static_cast<std::byte*>(mmap(nullptr, byte_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
73 INFO("Could not allocate destination memory");
74 REQUIRE(destination != MAP_FAILED);
76 return {.size = byte_size,
79 .region0 = std::move(region0),
80 .region = std::move(region)};
83 void snap_test_helper::read_whole_region()
85 for (int n = 1; n != 32; ++n) {
86 prologue_return ret = prologue(n);
87 const void* read = ret.region->read(ret.dstn, ret.src, ret.size);
88 INFO("Mismatch in MC_region_read()");
89 REQUIRE(not memcmp(ret.src, read, ret.size));
91 munmap(ret.dstn, ret.size);
92 munmap(ret.src, ret.size);
96 void snap_test_helper::read_region_parts()
98 for (int n = 1; n != 32; ++n) {
99 prologue_return ret = prologue(n);
101 for (int j = 0; j != 100; ++j) {
102 size_t offset = simgrid::xbt::random::uniform_int(0, ret.size - 1);
103 size_t size = simgrid::xbt::random::uniform_int(0, ret.size - offset - 1);
104 const void* read = ret.region->read(ret.dstn, (const char*)ret.src + offset, size);
105 INFO("Mismatch in MC_region_read()");
106 REQUIRE(not memcmp((char*)ret.src + offset, read, size));
108 munmap(ret.dstn, ret.size);
109 munmap(ret.src, ret.size);
113 void snap_test_helper::compare_whole_region()
115 for (int n = 1; n != 32; ++n) {
116 prologue_return ret = prologue(n);
118 INFO("Unexpected match in MC_snapshot_region_memcmp() with previous snapshot");
119 REQUIRE(MC_snapshot_region_memcmp(ret.src, ret.region0.get(), ret.src, ret.region.get(), ret.size));
121 munmap(ret.dstn, ret.size);
122 munmap(ret.src, ret.size);
126 void snap_test_helper::compare_region_parts()
128 for (int n = 1; n != 32; ++n) {
129 prologue_return ret = prologue(n);
131 for (int j = 0; j != 100; ++j) {
132 size_t offset = simgrid::xbt::random::uniform_int(0, ret.size - 1);
133 size_t size = simgrid::xbt::random::uniform_int(0, ret.size - offset - 1);
135 INFO("Mismatch in MC_snapshot_region_memcmp()");
136 REQUIRE(not MC_snapshot_region_memcmp((char*)ret.src + offset, ret.region.get(), (char*)ret.src + offset,
137 ret.region.get(), size));
139 munmap(ret.dstn, ret.size);
140 munmap(ret.src, ret.size);
144 const int some_global_variable = 42;
145 const void* const some_global_pointer = &some_global_variable;
146 void snap_test_helper::read_pointer()
148 prologue_return ret = prologue(1);
149 memcpy(ret.src, &some_global_pointer, sizeof(void*));
150 const simgrid::mc::Region region2(page_store_, memory_, simgrid::mc::RegionType::Data, ret.src, ret.size);
151 INFO("Mismtach in MC_region_read_pointer()");
152 REQUIRE(MC_region_read_pointer(®ion2, ret.src) == some_global_pointer);
154 munmap(ret.dstn, ret.size);
155 munmap(ret.src, ret.size);
158 /*************** End: class snap_test_helper *****************************/
160 TEST_CASE("MC::Snapshot: A copy/snapshot of a given memory region", "MC::Snapshot")
162 INFO("Sparse snapshot (using pages)");
164 snap_test_helper::basic_requirements();
166 snap_test_helper snap_test;
168 INFO("Read whole region");
169 snap_test.read_whole_region();
171 INFO("Read region parts");
172 snap_test.read_region_parts();
174 INFO("Compare whole region");
175 snap_test.compare_whole_region();
177 INFO("Compare region parts");
178 snap_test.compare_region_parts();
180 INFO("Read pointer");
181 snap_test.read_pointer();