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 static simgrid::mc::PageStore page_store_;
19 static std::unique_ptr<simgrid::mc::RemoteProcessMemory> memory_;
22 static void init_memory(void* mem, size_t size);
24 struct prologue_return {
31 static prologue_return prologue(int n); // common to the below 5 fxs
32 static void read_whole_region();
33 static void read_region_parts();
34 static void compare_whole_region();
35 static void compare_region_parts();
36 static void read_pointer();
38 static void cleanup() { memory_ = nullptr; }
41 // static member variables init.
42 simgrid::mc::PageStore snap_test_helper::page_store_(500);
43 std::unique_ptr<simgrid::mc::RemoteProcessMemory> snap_test_helper::memory_ = nullptr;
45 void snap_test_helper::init_memory(void* mem, size_t size)
47 auto* dest = static_cast<char*>(mem);
48 for (size_t i = 0; i < size; ++i) {
49 dest[i] = simgrid::xbt::random::uniform_int(0, 0xff);
53 void snap_test_helper::Init()
55 REQUIRE(xbt_pagesize == getpagesize());
56 REQUIRE(1 << xbt_pagebits == xbt_pagesize);
58 memory_ = std::make_unique<simgrid::mc::RemoteProcessMemory>(getpid());
59 memory_->init(nullptr);
62 snap_test_helper::prologue_return snap_test_helper::prologue(int n)
64 // Store region page(s):
65 size_t byte_size = n * xbt_pagesize;
66 void* source = mmap(nullptr, byte_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
67 INFO("Could not allocate source memory");
68 REQUIRE(source != MAP_FAILED);
70 // Init memory and take snapshots:
71 init_memory(source, byte_size);
73 new simgrid::mc::Region(page_store_, *memory_.get(), simgrid::mc::RegionType::Data, source, byte_size);
74 for (int i = 0; i < n; i += 2) {
75 init_memory((char*)source + i * xbt_pagesize, xbt_pagesize);
77 auto* region = new simgrid::mc::Region(page_store_, *memory_.get(), simgrid::mc::RegionType::Data, source, byte_size);
79 void* destination = mmap(nullptr, byte_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
80 INFO("Could not allocate destination memory");
81 REQUIRE(destination != MAP_FAILED);
83 return {.size = byte_size, .src = source, .dstn = destination, .region0 = region0, .region = region};
86 void snap_test_helper::read_whole_region()
88 for (int n = 1; n != 32; ++n) {
89 prologue_return ret = prologue(n);
90 const void* read = ret.region->read(ret.dstn, ret.src, ret.size);
91 INFO("Mismatch in MC_region_read()");
92 REQUIRE(not memcmp(ret.src, read, ret.size));
94 munmap(ret.dstn, ret.size);
95 munmap(ret.src, ret.size);
101 void snap_test_helper::read_region_parts()
103 for (int n = 1; n != 32; ++n) {
104 prologue_return ret = prologue(n);
106 for (int j = 0; j != 100; ++j) {
107 size_t offset = simgrid::xbt::random::uniform_int(0, ret.size - 1);
108 size_t size = simgrid::xbt::random::uniform_int(0, ret.size - offset - 1);
109 const void* read = ret.region->read(ret.dstn, (const char*)ret.src + offset, size);
110 INFO("Mismatch in MC_region_read()");
111 REQUIRE(not memcmp((char*)ret.src + offset, read, size));
113 munmap(ret.dstn, ret.size);
114 munmap(ret.src, ret.size);
120 void snap_test_helper::compare_whole_region()
122 for (int n = 1; n != 32; ++n) {
123 prologue_return ret = prologue(n);
125 INFO("Unexpected match in MC_snapshot_region_memcmp() with previous snapshot");
126 REQUIRE(MC_snapshot_region_memcmp(ret.src, ret.region0, ret.src, ret.region, ret.size));
128 munmap(ret.dstn, ret.size);
129 munmap(ret.src, ret.size);
135 void snap_test_helper::compare_region_parts()
137 for (int n = 1; n != 32; ++n) {
138 prologue_return ret = prologue(n);
140 for (int j = 0; j != 100; ++j) {
141 size_t offset = simgrid::xbt::random::uniform_int(0, ret.size - 1);
142 size_t size = simgrid::xbt::random::uniform_int(0, ret.size - offset - 1);
144 INFO("Mismatch in MC_snapshot_region_memcmp()");
145 REQUIRE(not MC_snapshot_region_memcmp((char*)ret.src + offset, ret.region, (char*)ret.src + offset, ret.region,
148 munmap(ret.dstn, ret.size);
149 munmap(ret.src, ret.size);
155 int some_global_variable = 42;
156 void* some_global_pointer = &some_global_variable;
157 void snap_test_helper::read_pointer()
159 prologue_return ret = prologue(1);
160 memcpy(ret.src, &some_global_pointer, sizeof(void*));
161 const simgrid::mc::Region region2(page_store_, *memory_.get(), simgrid::mc::RegionType::Data, ret.src, ret.size);
162 INFO("Mismtach in MC_region_read_pointer()");
163 REQUIRE(MC_region_read_pointer(®ion2, ret.src) == some_global_pointer);
165 munmap(ret.dstn, ret.size);
166 munmap(ret.src, ret.size);
171 /*************** End: class snap_test_helper *****************************/
173 TEST_CASE("MC::Snapshot: A copy/snapshot of a given memory region", "MC::Snapshot")
175 INFO("Sparse snapshot (using pages)");
177 snap_test_helper::Init();
179 INFO("Read whole region");
180 snap_test_helper::read_whole_region();
182 INFO("Read region parts");
183 snap_test_helper::read_region_parts();
185 INFO("Compare whole region");
186 snap_test_helper::compare_whole_region();
188 INFO("Compare region parts");
189 snap_test_helper::compare_region_parts();
191 INFO("Read pointer");
192 snap_test_helper::read_pointer();
194 snap_test_helper::cleanup();