mirror of
https://github.com/fluencelabs/wasmer
synced 2024-12-13 22:25:40 +00:00
706 lines
26 KiB
C++
706 lines
26 KiB
C++
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#if !defined(WASMER_H_MACROS)
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#define WASMER_H_MACROS
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#if defined(MSVC)
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#if defined(_M_AMD64)
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#define ARCH_X86_64
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#endif
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#endif
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#if defined(GCC) || defined(__clang__)
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#if defined(__x86_64__)
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#define ARCH_X86_64
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#endif
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#endif
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#endif
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#ifndef WASMER_H
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#define WASMER_H
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#include <cstdarg>
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#include <cstdint>
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#include <cstdlib>
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#include <new>
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/// List of export/import kinds.
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enum class wasmer_import_export_kind : uint32_t {
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WASM_FUNCTION = 0,
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WASM_GLOBAL = 1,
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WASM_MEMORY = 2,
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WASM_TABLE = 3,
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};
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enum class wasmer_result_t {
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WASMER_OK = 1,
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WASMER_ERROR = 2,
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};
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enum class wasmer_value_tag : uint32_t {
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WASM_I32,
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WASM_I64,
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WASM_F32,
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WASM_F64,
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};
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struct wasmer_module_t {
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};
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/// Opaque pointer to `NamedExportDescriptor`.
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struct wasmer_export_descriptor_t {
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};
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struct wasmer_byte_array {
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const uint8_t *bytes;
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uint32_t bytes_len;
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};
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/// Opaque pointer to `NamedExportDescriptors`.
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struct wasmer_export_descriptors_t {
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};
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/// Opaque pointer to `wasmer_export_t`.
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struct wasmer_export_func_t {
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};
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union wasmer_value {
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int32_t I32;
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int64_t I64;
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float F32;
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double F64;
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};
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struct wasmer_value_t {
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wasmer_value_tag tag;
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wasmer_value value;
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};
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/// Opaque pointer to `NamedExport`.
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struct wasmer_export_t {
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};
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struct wasmer_memory_t {
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};
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/// Opaque pointer to `NamedExports`.
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struct wasmer_exports_t {
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};
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struct wasmer_global_t {
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};
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struct wasmer_global_descriptor_t {
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bool mutable_;
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wasmer_value_tag kind;
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};
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struct wasmer_import_descriptor_t {
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};
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struct wasmer_import_descriptors_t {
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};
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struct wasmer_import_func_t {
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};
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struct wasmer_import_object_t {
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};
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struct wasmer_table_t {
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};
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/// Union of import/export value.
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union wasmer_import_export_value {
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const wasmer_import_func_t *func;
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const wasmer_table_t *table;
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const wasmer_memory_t *memory;
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const wasmer_global_t *global;
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};
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struct wasmer_import_t {
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wasmer_byte_array module_name;
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wasmer_byte_array import_name;
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wasmer_import_export_kind tag;
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wasmer_import_export_value value;
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};
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struct wasmer_import_object_iter_t {
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};
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struct wasmer_instance_t {
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};
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struct wasmer_instance_context_t {
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};
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struct wasmer_limit_option_t {
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bool has_some;
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uint32_t some;
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};
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struct wasmer_limits_t {
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uint32_t min;
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wasmer_limit_option_t max;
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};
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struct wasmer_serialized_module_t {
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};
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#if (!defined(_WIN32) && defined(ARCH_X86_64))
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struct wasmer_trampoline_buffer_builder_t {
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};
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#endif
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#if (!defined(_WIN32) && defined(ARCH_X86_64))
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struct wasmer_trampoline_callable_t {
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};
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#endif
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#if (!defined(_WIN32) && defined(ARCH_X86_64))
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struct wasmer_trampoline_buffer_t {
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};
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#endif
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/// Opens a directory that's visible to the WASI module as `alias` but
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/// is backed by the host file at `host_file_path`
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struct wasmer_wasi_map_dir_entry_t {
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/// What the WASI module will see in its virtual root
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wasmer_byte_array alias;
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/// The backing file that the WASI module will interact with via the alias
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wasmer_byte_array host_file_path;
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};
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extern "C" {
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/// Creates a new Module from the given wasm bytes.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_compile(wasmer_module_t **module,
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uint8_t *wasm_bytes,
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uint32_t wasm_bytes_len);
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/// Gets export descriptor kind
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wasmer_import_export_kind wasmer_export_descriptor_kind(wasmer_export_descriptor_t *export_);
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/// Gets name for the export descriptor
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wasmer_byte_array wasmer_export_descriptor_name(wasmer_export_descriptor_t *export_descriptor);
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/// Gets export descriptors for the given module
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///
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/// The caller owns the object and should call `wasmer_export_descriptors_destroy` to free it.
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void wasmer_export_descriptors(const wasmer_module_t *module,
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wasmer_export_descriptors_t **export_descriptors);
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/// Frees the memory for the given export descriptors
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void wasmer_export_descriptors_destroy(wasmer_export_descriptors_t *export_descriptors);
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/// Gets export descriptor by index
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wasmer_export_descriptor_t *wasmer_export_descriptors_get(wasmer_export_descriptors_t *export_descriptors,
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int idx);
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/// Gets the length of the export descriptors
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int wasmer_export_descriptors_len(wasmer_export_descriptors_t *exports);
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/// Calls a `func` with the provided parameters.
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/// Results are set using the provided `results` pointer.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_export_func_call(const wasmer_export_func_t *func,
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const wasmer_value_t *params,
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unsigned int params_len,
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wasmer_value_t *results,
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unsigned int results_len);
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/// Sets the params buffer to the parameter types of the given wasmer_export_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_export_func_params(const wasmer_export_func_t *func,
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wasmer_value_tag *params,
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uint32_t params_len);
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/// Sets the result parameter to the arity of the params of the wasmer_export_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_export_func_params_arity(const wasmer_export_func_t *func, uint32_t *result);
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/// Sets the returns buffer to the parameter types of the given wasmer_export_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_export_func_returns(const wasmer_export_func_t *func,
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wasmer_value_tag *returns,
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uint32_t returns_len);
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/// Sets the result parameter to the arity of the returns of the wasmer_export_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_export_func_returns_arity(const wasmer_export_func_t *func,
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uint32_t *result);
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/// Gets wasmer_export kind
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wasmer_import_export_kind wasmer_export_kind(wasmer_export_t *export_);
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/// Gets name from wasmer_export
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wasmer_byte_array wasmer_export_name(wasmer_export_t *export_);
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/// Gets export func from export
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const wasmer_export_func_t *wasmer_export_to_func(const wasmer_export_t *export_);
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/// Gets a memory pointer from an export pointer.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_export_to_memory(const wasmer_export_t *export_, wasmer_memory_t **memory);
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/// Frees the memory for the given exports
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void wasmer_exports_destroy(wasmer_exports_t *exports);
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/// Gets wasmer_export by index
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wasmer_export_t *wasmer_exports_get(wasmer_exports_t *exports, int idx);
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/// Gets the length of the exports
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int wasmer_exports_len(wasmer_exports_t *exports);
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/// Frees memory for the given Global
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void wasmer_global_destroy(wasmer_global_t *global);
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/// Gets the value stored by the given Global
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wasmer_value_t wasmer_global_get(wasmer_global_t *global);
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/// Returns a descriptor (type, mutability) of the given Global
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wasmer_global_descriptor_t wasmer_global_get_descriptor(wasmer_global_t *global);
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/// Creates a new Global and returns a pointer to it.
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/// The caller owns the object and should call `wasmer_global_destroy` to free it.
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wasmer_global_t *wasmer_global_new(wasmer_value_t value, bool mutable_);
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/// Sets the value stored by the given Global
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void wasmer_global_set(wasmer_global_t *global, wasmer_value_t value);
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/// Gets export descriptor kind
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wasmer_import_export_kind wasmer_import_descriptor_kind(wasmer_import_descriptor_t *export_);
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/// Gets module name for the import descriptor
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wasmer_byte_array wasmer_import_descriptor_module_name(wasmer_import_descriptor_t *import_descriptor);
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/// Gets name for the import descriptor
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wasmer_byte_array wasmer_import_descriptor_name(wasmer_import_descriptor_t *import_descriptor);
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/// Gets import descriptors for the given module
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///
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/// The caller owns the object and should call `wasmer_import_descriptors_destroy` to free it.
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void wasmer_import_descriptors(const wasmer_module_t *module,
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wasmer_import_descriptors_t **import_descriptors);
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/// Frees the memory for the given import descriptors
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void wasmer_import_descriptors_destroy(wasmer_import_descriptors_t *import_descriptors);
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/// Gets import descriptor by index
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wasmer_import_descriptor_t *wasmer_import_descriptors_get(wasmer_import_descriptors_t *import_descriptors,
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unsigned int idx);
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/// Gets the length of the import descriptors
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unsigned int wasmer_import_descriptors_len(wasmer_import_descriptors_t *exports);
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/// Frees memory for the given Func
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void wasmer_import_func_destroy(wasmer_import_func_t *func);
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/// Creates new func
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///
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/// The caller owns the object and should call `wasmer_import_func_destroy` to free it.
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wasmer_import_func_t *wasmer_import_func_new(void (*func)(void *data),
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const wasmer_value_tag *params,
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unsigned int params_len,
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const wasmer_value_tag *returns,
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unsigned int returns_len);
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/// Sets the params buffer to the parameter types of the given wasmer_import_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_import_func_params(const wasmer_import_func_t *func,
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wasmer_value_tag *params,
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unsigned int params_len);
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/// Sets the result parameter to the arity of the params of the wasmer_import_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_import_func_params_arity(const wasmer_import_func_t *func, uint32_t *result);
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/// Sets the returns buffer to the parameter types of the given wasmer_import_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_import_func_returns(const wasmer_import_func_t *func,
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wasmer_value_tag *returns,
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unsigned int returns_len);
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/// Sets the result parameter to the arity of the returns of the wasmer_import_func_t
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_import_func_returns_arity(const wasmer_import_func_t *func,
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uint32_t *result);
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/// Frees memory of the given ImportObject
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void wasmer_import_object_destroy(wasmer_import_object_t *import_object);
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/// Extends an existing import object with new imports
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wasmer_result_t wasmer_import_object_extend(wasmer_import_object_t *import_object,
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const wasmer_import_t *imports,
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unsigned int imports_len);
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/// Gets an entry from an ImportObject at the name and namespace.
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/// Stores `name`, `namespace`, and `import_export_value` in `import`.
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/// Thus these must remain valid for the lifetime of `import`.
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///
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/// The caller owns all data involved.
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/// `import_export_value` will be written to based on `tag`.
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wasmer_result_t wasmer_import_object_get_import(const wasmer_import_object_t *import_object,
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wasmer_byte_array namespace_,
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wasmer_byte_array name,
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wasmer_import_t *import,
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wasmer_import_export_value *import_export_value,
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uint32_t tag);
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/// Frees the memory allocated in `wasmer_import_object_iter_next`
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///
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/// This function does not free the memory in `wasmer_import_object_t`;
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/// it only frees memory allocated while querying a `wasmer_import_object_t`.
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void wasmer_import_object_imports_destroy(wasmer_import_t *imports, uint32_t imports_len);
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/// Returns true if further calls to `wasmer_import_object_iter_next` will
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/// not return any new data
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bool wasmer_import_object_iter_at_end(wasmer_import_object_iter_t *import_object_iter);
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/// Frees the memory allocated by `wasmer_import_object_iterate_functions`
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void wasmer_import_object_iter_destroy(wasmer_import_object_iter_t *import_object_iter);
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/// Writes the next value to `import`. `WASMER_ERROR` is returned if there
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/// was an error or there's nothing left to return.
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///
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/// To free the memory allocated here, pass the import to `wasmer_import_object_imports_destroy`.
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/// To check if the iterator is done, use `wasmer_import_object_iter_at_end`.
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wasmer_result_t wasmer_import_object_iter_next(wasmer_import_object_iter_t *import_object_iter,
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wasmer_import_t *import);
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/// Create an iterator over the functions in the import object.
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/// Get the next import with `wasmer_import_object_iter_next`
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/// Free the iterator with `wasmer_import_object_iter_destroy`
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wasmer_import_object_iter_t *wasmer_import_object_iterate_functions(const wasmer_import_object_t *import_object);
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/// Creates a new empty import object.
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/// See also `wasmer_import_object_append`
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wasmer_import_object_t *wasmer_import_object_new();
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/// Calls an instances exported function by `name` with the provided parameters.
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/// Results are set using the provided `results` pointer.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_instance_call(wasmer_instance_t *instance,
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const char *name,
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const wasmer_value_t *params,
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uint32_t params_len,
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wasmer_value_t *results,
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uint32_t results_len);
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/// Gets the `data` field within the context.
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void *wasmer_instance_context_data_get(const wasmer_instance_context_t *ctx);
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/// Sets the `data` field of the instance context. This context will be
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/// passed to all imported function for instance.
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void wasmer_instance_context_data_set(wasmer_instance_t *instance, void *data_ptr);
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/// Extracts the instance's context and returns it.
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const wasmer_instance_context_t *wasmer_instance_context_get(wasmer_instance_t *instance);
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/// Gets the memory within the context at the index `memory_idx`.
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/// The index is always 0 until multiple memories are supported.
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const wasmer_memory_t *wasmer_instance_context_memory(const wasmer_instance_context_t *ctx,
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uint32_t _memory_idx);
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/// Frees memory for the given Instance
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void wasmer_instance_destroy(wasmer_instance_t *instance);
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/// Gets Exports for the given instance
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///
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/// The caller owns the object and should call `wasmer_exports_destroy` to free it.
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void wasmer_instance_exports(wasmer_instance_t *instance, wasmer_exports_t **exports);
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/// Creates a new Instance from the given wasm bytes and imports.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_instantiate(wasmer_instance_t **instance,
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uint8_t *wasm_bytes,
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uint32_t wasm_bytes_len,
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wasmer_import_t *imports,
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int imports_len);
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/// Gets the length in bytes of the last error.
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/// This can be used to dynamically allocate a buffer with the correct number of
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/// bytes needed to store a message.
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///
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/// # Example
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///
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/// ```c
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/// int error_len = wasmer_last_error_length();
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/// char *error_str = malloc(error_len);
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/// ```
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int wasmer_last_error_length();
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/// Stores the last error message into the provided buffer up to the given `length`.
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/// The `length` parameter must be large enough to store the last error message.
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///
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/// Returns the length of the string in bytes.
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/// Returns `-1` if an error occurs.
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///
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/// # Example
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///
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/// ```c
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/// int error_len = wasmer_last_error_length();
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/// char *error_str = malloc(error_len);
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/// wasmer_last_error_message(error_str, error_len);
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/// printf("Error str: `%s`\n", error_str);
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/// ```
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int wasmer_last_error_message(char *buffer, int length);
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/// Gets the start pointer to the bytes within a Memory
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uint8_t *wasmer_memory_data(const wasmer_memory_t *mem);
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/// Gets the size in bytes of a Memory
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uint32_t wasmer_memory_data_length(wasmer_memory_t *mem);
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/// Frees memory for the given Memory
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void wasmer_memory_destroy(wasmer_memory_t *memory);
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/// Grows a Memory by the given number of pages.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_memory_grow(wasmer_memory_t *memory, uint32_t delta);
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/// Returns the current length in pages of the given memory
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uint32_t wasmer_memory_length(const wasmer_memory_t *memory);
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/// Creates a new Memory for the given descriptor and initializes the given
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/// pointer to pointer to a pointer to the new memory.
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///
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/// The caller owns the object and should call `wasmer_memory_destroy` to free it.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_memory_new(wasmer_memory_t **memory, wasmer_limits_t limits);
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/// Deserialize the given serialized module.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_module_deserialize(wasmer_module_t **module,
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const wasmer_serialized_module_t *serialized_module);
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/// Frees memory for the given Module
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void wasmer_module_destroy(wasmer_module_t *module);
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/// Given:
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/// * A prepared `wasmer` import-object
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/// * A compiled wasmer module
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///
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/// Instantiates a wasmer instance
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wasmer_result_t wasmer_module_import_instantiate(wasmer_instance_t **instance,
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const wasmer_module_t *module,
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const wasmer_import_object_t *import_object);
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/// Creates a new Instance from the given module and imports.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_module_instantiate(const wasmer_module_t *module,
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wasmer_instance_t **instance,
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wasmer_import_t *imports,
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int imports_len);
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/// Serialize the given Module.
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///
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/// The caller owns the object and should call `wasmer_serialized_module_destroy` to free it.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_module_serialize(wasmer_serialized_module_t **serialized_module,
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const wasmer_module_t *module);
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/// Get bytes of the serialized module.
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wasmer_byte_array wasmer_serialized_module_bytes(const wasmer_serialized_module_t *serialized_module);
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/// Frees memory for the given serialized Module.
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void wasmer_serialized_module_destroy(wasmer_serialized_module_t *serialized_module);
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/// Transform a sequence of bytes into a serialized module.
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///
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/// The caller owns the object and should call `wasmer_serialized_module_destroy` to free it.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_serialized_module_from_bytes(wasmer_serialized_module_t **serialized_module,
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const uint8_t *serialized_module_bytes,
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uint32_t serialized_module_bytes_length);
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/// Frees memory for the given Table
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void wasmer_table_destroy(wasmer_table_t *table);
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/// Grows a Table by the given number of elements.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_table_grow(wasmer_table_t *table, uint32_t delta);
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/// Returns the current length of the given Table
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uint32_t wasmer_table_length(wasmer_table_t *table);
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/// Creates a new Table for the given descriptor and initializes the given
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/// pointer to pointer to a pointer to the new Table.
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///
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/// The caller owns the object and should call `wasmer_table_destroy` to free it.
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///
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/// Returns `wasmer_result_t::WASMER_OK` upon success.
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///
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/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
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/// and `wasmer_last_error_message` to get an error message.
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wasmer_result_t wasmer_table_new(wasmer_table_t **table, wasmer_limits_t limits);
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#if (!defined(_WIN32) && defined(ARCH_X86_64))
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/// Adds a callinfo trampoline to the builder.
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uintptr_t wasmer_trampoline_buffer_builder_add_callinfo_trampoline(wasmer_trampoline_buffer_builder_t *builder,
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const wasmer_trampoline_callable_t *func,
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const void *ctx,
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uint32_t num_params);
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#endif
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#if (!defined(_WIN32) && defined(ARCH_X86_64))
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/// Adds a context trampoline to the builder.
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uintptr_t wasmer_trampoline_buffer_builder_add_context_trampoline(wasmer_trampoline_buffer_builder_t *builder,
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const wasmer_trampoline_callable_t *func,
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const void *ctx);
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#endif
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#if (!defined(_WIN32) && defined(ARCH_X86_64))
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/// Finalizes the trampoline builder into an executable buffer.
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wasmer_trampoline_buffer_t *wasmer_trampoline_buffer_builder_build(wasmer_trampoline_buffer_builder_t *builder);
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#endif
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#if (!defined(_WIN32) && defined(ARCH_X86_64))
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/// Creates a new trampoline builder.
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wasmer_trampoline_buffer_builder_t *wasmer_trampoline_buffer_builder_new();
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#endif
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#if (!defined(_WIN32) && defined(ARCH_X86_64))
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/// Destroys the trampoline buffer if not null.
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void wasmer_trampoline_buffer_destroy(wasmer_trampoline_buffer_t *buffer);
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#endif
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#if (!defined(_WIN32) && defined(ARCH_X86_64))
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/// Returns the callable pointer for the trampoline with index `idx`.
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const wasmer_trampoline_callable_t *wasmer_trampoline_buffer_get_trampoline(const wasmer_trampoline_buffer_t *buffer,
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uintptr_t idx);
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#endif
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#if (!defined(_WIN32) && defined(ARCH_X86_64))
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/// Returns the context added by `add_context_trampoline`, from within the callee function.
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void *wasmer_trampoline_get_context();
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#endif
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/// Returns true for valid wasm bytes and false for invalid bytes
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bool wasmer_validate(const uint8_t *wasm_bytes, uint32_t wasm_bytes_len);
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/// Convenience function that creates a WASI import object with no arguments,
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/// environment variables, preopened files, or mapped directories.
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///
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/// This function is the same as calling [`wasmer_wasi_generate_import_object`] with all
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/// empty values.
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wasmer_import_object_t *wasmer_wasi_generate_default_import_object();
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/// Creates a WASI import object.
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///
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/// This function treats null pointers as empty collections.
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/// For example, passing null for a string in `args`, will lead to a zero
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/// length argument in that position.
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wasmer_import_object_t *wasmer_wasi_generate_import_object(const wasmer_byte_array *args,
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unsigned int args_len,
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const wasmer_byte_array *envs,
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unsigned int envs_len,
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const wasmer_byte_array *preopened_files,
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unsigned int preopened_files_len,
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const wasmer_wasi_map_dir_entry_t *mapped_dirs,
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unsigned int mapped_dirs_len);
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} // extern "C"
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#endif // WASMER_H
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