Function getHostFunction

src/Interpreters/WebAssembly/HostApi.cpp:191–211

API exported to guest WebAssembly code.

/// API exported to guest WebAssembly code.
WasmHostFunction getHostFunction(std::string_view function_name)
{
    static const std::array exported_functions{
        makeHostFunction("clickhouse_server_version", wasmExportServerVer),
        makeHostFunction("clickhouse_throw", wasmExportThrow),
        makeHostFunction("clickhouse_log", wasmExportLog),
        makeHostFunction("clickhouse_random", wasmExportRandom),
        /// Mandatory import for any AssemblyScript module that uses runtime checks
        /// (memory allocation, bounds checks, etc). Linked only when the module
        /// declares `(import "env" "abort" (func ...))`, so non-AS modules are unaffected.
        makeHostFunction("abort", wasmExportAssemblyScriptAbort),
    };

    for (const auto & function : exported_functions)
    {
        if (function.getFunctionDeclaration().getName() == function_name)
            return function;
    }

    throw Exception(ErrorCodes::RESOURCE_NOT_FOUND, "Unknown WebAssembly host function '{}'", function_name);
}

}