ClickHouse/dbms/src/Functions/trap.cpp

#if 0

#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnString.h>

#include <thread>
#include <memory>
#include <cstdlib>
#include <unistd.h>


namespace DB
{

namespace ErrorCodes
{
    extern const int ILLEGAL_COLUMN;
    extern const int ILLEGAL_TYPE_OF_ARGUMENT;
    extern const int BAD_ARGUMENTS;
}


/// Various illegal actions to test diagnostic features of ClickHouse itself. Should not be enabled in production builds.
class FunctionTrap : public IFunction
{
public:
    static constexpr auto name = "trap";
    static FunctionPtr create(const Context &)
    {
        return std::make_shared<FunctionTrap>();
    }

    String getName() const override
    {
        return name;
    }

    size_t getNumberOfArguments() const override
    {
        return 1;
    }

    DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
    {
        if (!isString(arguments[0]))
            throw Exception("The only argument for function " + getName() + " must be constant String", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);

        return std::make_shared<DataTypeUInt8>();
    }

    void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override
    {
        if (const ColumnConst * column = checkAndGetColumnConst<ColumnString>(block.getByPosition(arguments[0]).column.get()))
        {
            String mode = column->getValue<String>();

            if (mode == "read nullptr c++")
            {
                volatile int x = *reinterpret_cast<const volatile int *>(0);
                (void)x;
            }
            else if (mode == "read nullptr asm")
            {
                __asm__ volatile ("movq $0, %rax");
                __asm__ volatile ("movq (%rax), %rax");
            }
            else if (mode == "illegal instruction")
            {
                __asm__ volatile ("ud2a");
            }
            else if (mode == "abort")
            {
                abort();
            }
            else if (mode == "use after free")
            {
                int * x_ptr;
                {
                    auto x = std::make_unique<int>();
                    x_ptr = x.get();
                }
                *x_ptr = 1;
                (void)x_ptr;
            }
            else if (mode == "use after scope")
            {
                volatile int * x_ptr;
                [&]{
                    volatile int x = 0;
                    x_ptr = &x;
                    (void)x;
                }();
                [&]{
                    volatile int y = 1;
                    *x_ptr = 2;
                    (void)y;
                }();
                (void)x_ptr;
            }
            else if (mode == "uninitialized memory")
            {
                int x;
                (void)write(2, &x, sizeof(x));
            }
            else if (mode == "data race")
            {
                int x = 0;
                std::thread t1([&]{ ++x; });
                std::thread t2([&]{ ++x; });
                t1.join();
                t2.join();
            }
            else
                throw Exception("Unknown trap mode", ErrorCodes::BAD_ARGUMENTS);
        }
        else
            throw Exception("The only argument for function " + getName() + " must be constant String", ErrorCodes::ILLEGAL_COLUMN);

        block.getByPosition(result).column = block.getByPosition(result).type->createColumnConst(input_rows_count, 0ULL);
    }
};


void registerFunctionTrap(FunctionFactory & factory)
{
    factory.registerFunction<FunctionTrap>();
}

}

#else

namespace DB
{
    class FunctionFactory;
    void registerFunctionTrap(FunctionFactory &) {}
}

#endif