shm/testallshm/test/test_size_map.cpp


#include "catch.hpp"
#include "size_map.h"
#include "shm_manager.h"

TEST_CASE("SizeMap, CalcAlignment")
{
    for(size_t i = 0; i < CLASS_MAX_BYTES; ++i)
    {
        auto value = bg::detail::SizeMap::CalcAlignment(i);
        REQUIRE(value > 0);
        REQUIRE(value % 8 == 0);
        REQUIRE(value <= PAGE_BYTES);
        if(i > 0x7F && i < (PAGE_BYTES << 4))
        {
            REQUIRE(PALIGN_DOWN(i, value << 3) == value << 3);
        }
    }
}


TEST_CASE("SizeMap, Class Index to Page")
{
    bg::detail::SizeMap sizemap;
    sizemap.Init();
    for(size_t bytes = 0; bytes < CLASS_MAX_BYTES; ++bytes)
    {
        size_t index = sizemap.GetClassByBytes(bytes);

        REQUIRE(index < CLASS_MAX_COUNT);
        REQUIRE(sizemap.ClassToSize(index) >= bytes);
        REQUIRE(sizemap.ClassToPages(index) * PAGE_BYTES >= bytes);
        REQUIRE(sizemap.ClassToPages(index) * PAGE_BYTES <= CLASS_MAX_BYTES);
        if(index > 1)
        {
            REQUIRE(sizemap.ClassToSize(index - 1) < bytes);
        }

    }
}