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Unlike JS-only modules, native add-ons are always associated with a
dynamic shared object from which they are loaded. Being able to
retrieve its absolute path is important to native-only add-ons, i.e.
add-ons that are not themselves being loaded from a JS-only module
located in the same package as the native add-on itself.

Currently, the file name is obtained at environment construction time
from the JS `module.filename`. Nevertheless, the presence of `module`
is not required, because the file name could also be passed in via a
private property added onto `exports` from the `process.dlopen`
binding.

As an attempt at future-proofing, the file name is provided as a URL,
i.e. prefixed with the `file://` protocol.

Fixes: nodejs/node-addon-api#449
PR-URL: #37195
Co-authored-by: Michael Dawson <mdawson@devrus.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
13 contributors

Users who have contributed to this file

@addaleax @mhdawson @jasongin @boingoing @devsnek @cjihrig @kfarnung @danbev @tniessen @mafintosh @shivanth @brandon93s
271 lines (222 sloc) 11.4 KB
#ifndef SRC_NODE_API_H_
#define SRC_NODE_API_H_
#ifdef BUILDING_NODE_EXTENSION
#ifdef _WIN32
// Building native module against node
#define NAPI_EXTERN __declspec(dllimport)
#elif defined(__wasm32__)
#define NAPI_EXTERN __attribute__((__import_module__("napi")))
#endif
#endif
#include "js_native_api.h"
#include "node_api_types.h"
struct uv_loop_s; // Forward declaration.
#ifdef _WIN32
# define NAPI_MODULE_EXPORT __declspec(dllexport)
#else
# define NAPI_MODULE_EXPORT __attribute__((visibility("default")))
#endif
#if defined(__GNUC__)
# define NAPI_NO_RETURN __attribute__((noreturn))
#elif defined(_WIN32)
# define NAPI_NO_RETURN __declspec(noreturn)
#else
# define NAPI_NO_RETURN
#endif
typedef napi_value (*napi_addon_register_func)(napi_env env,
napi_value exports);
typedef struct napi_module {
int nm_version;
unsigned int nm_flags;
const char* nm_filename;
napi_addon_register_func nm_register_func;
const char* nm_modname;
void* nm_priv;
void* reserved[4];
} napi_module;
#define NAPI_MODULE_VERSION 1
#if defined(_MSC_VER)
#pragma section(".CRT$XCU", read)
#define NAPI_C_CTOR(fn) \
static void __cdecl fn(void); \
__declspec(dllexport, allocate(".CRT$XCU")) void(__cdecl * fn##_)(void) = \
fn; \
static void __cdecl fn(void)
#else
#define NAPI_C_CTOR(fn) \
static void fn(void) __attribute__((constructor)); \
static void fn(void)
#endif
#define NAPI_MODULE_X(modname, regfunc, priv, flags) \
EXTERN_C_START \
static napi_module _module = \
{ \
NAPI_MODULE_VERSION, \
flags, \
__FILE__, \
regfunc, \
#modname, \
priv, \
{0}, \
}; \
NAPI_C_CTOR(_register_ ## modname) { \
napi_module_register(&_module); \
} \
EXTERN_C_END
#define NAPI_MODULE_INITIALIZER_X(base, version) \
NAPI_MODULE_INITIALIZER_X_HELPER(base, version)
#define NAPI_MODULE_INITIALIZER_X_HELPER(base, version) base##version
#ifdef __wasm32__
#define NAPI_WASM_INITIALIZER \
NAPI_MODULE_INITIALIZER_X(napi_register_wasm_v, NAPI_MODULE_VERSION)
#define NAPI_MODULE(modname, regfunc) \
EXTERN_C_START \
NAPI_MODULE_EXPORT napi_value NAPI_WASM_INITIALIZER(napi_env env, \
napi_value exports) { \
return regfunc(env, exports); \
} \
EXTERN_C_END
#else
#define NAPI_MODULE(modname, regfunc) \
NAPI_MODULE_X(modname, regfunc, NULL, 0) // NOLINT (readability/null_usage)
#endif
#define NAPI_MODULE_INITIALIZER_BASE napi_register_module_v
#define NAPI_MODULE_INITIALIZER \
NAPI_MODULE_INITIALIZER_X(NAPI_MODULE_INITIALIZER_BASE, \
NAPI_MODULE_VERSION)
#define NAPI_MODULE_INIT() \
EXTERN_C_START \
NAPI_MODULE_EXPORT napi_value \
NAPI_MODULE_INITIALIZER(napi_env env, napi_value exports); \
EXTERN_C_END \
NAPI_MODULE(NODE_GYP_MODULE_NAME, NAPI_MODULE_INITIALIZER) \
napi_value NAPI_MODULE_INITIALIZER(napi_env env, \
napi_value exports)
EXTERN_C_START
NAPI_EXTERN void napi_module_register(napi_module* mod);
NAPI_EXTERN NAPI_NO_RETURN void napi_fatal_error(const char* location,
size_t location_len,
const char* message,
size_t message_len);
// Methods for custom handling of async operations
NAPI_EXTERN napi_status napi_async_init(napi_env env,
napi_value async_resource,
napi_value async_resource_name,
napi_async_context* result);
NAPI_EXTERN napi_status napi_async_destroy(napi_env env,
napi_async_context async_context);
NAPI_EXTERN napi_status napi_make_callback(napi_env env,
napi_async_context async_context,
napi_value recv,
napi_value func,
size_t argc,
const napi_value* argv,
napi_value* result);
// Methods to provide node::Buffer functionality with napi types
NAPI_EXTERN napi_status napi_create_buffer(napi_env env,
size_t length,
void** data,
napi_value* result);
NAPI_EXTERN napi_status napi_create_external_buffer(napi_env env,
size_t length,
void* data,
napi_finalize finalize_cb,
void* finalize_hint,
napi_value* result);
NAPI_EXTERN napi_status napi_create_buffer_copy(napi_env env,
size_t length,
const void* data,
void** result_data,
napi_value* result);
NAPI_EXTERN napi_status napi_is_buffer(napi_env env,
napi_value value,
bool* result);
NAPI_EXTERN napi_status napi_get_buffer_info(napi_env env,
napi_value value,
void** data,
size_t* length);
// Methods to manage simple async operations
NAPI_EXTERN
napi_status napi_create_async_work(napi_env env,
napi_value async_resource,
napi_value async_resource_name,
napi_async_execute_callback execute,
napi_async_complete_callback complete,
void* data,
napi_async_work* result);
NAPI_EXTERN napi_status napi_delete_async_work(napi_env env,
napi_async_work work);
NAPI_EXTERN napi_status napi_queue_async_work(napi_env env,
napi_async_work work);
NAPI_EXTERN napi_status napi_cancel_async_work(napi_env env,
napi_async_work work);
// version management
NAPI_EXTERN
napi_status napi_get_node_version(napi_env env,
const napi_node_version** version);
#if NAPI_VERSION >= 2
// Return the current libuv event loop for a given environment
NAPI_EXTERN napi_status napi_get_uv_event_loop(napi_env env,
struct uv_loop_s** loop);
#endif // NAPI_VERSION >= 2
#if NAPI_VERSION >= 3
NAPI_EXTERN napi_status napi_fatal_exception(napi_env env, napi_value err);
NAPI_EXTERN napi_status napi_add_env_cleanup_hook(napi_env env,
void (*fun)(void* arg),
void* arg);
NAPI_EXTERN napi_status napi_remove_env_cleanup_hook(napi_env env,
void (*fun)(void* arg),
void* arg);
NAPI_EXTERN napi_status napi_open_callback_scope(napi_env env,
napi_value resource_object,
napi_async_context context,
napi_callback_scope* result);
NAPI_EXTERN napi_status napi_close_callback_scope(napi_env env,
napi_callback_scope scope);
#endif // NAPI_VERSION >= 3
#if NAPI_VERSION >= 4
#ifndef __wasm32__
// Calling into JS from other threads
NAPI_EXTERN napi_status
napi_create_threadsafe_function(napi_env env,
napi_value func,
napi_value async_resource,
napi_value async_resource_name,
size_t max_queue_size,
size_t initial_thread_count,
void* thread_finalize_data,
napi_finalize thread_finalize_cb,
void* context,
napi_threadsafe_function_call_js call_js_cb,
napi_threadsafe_function* result);
NAPI_EXTERN napi_status
napi_get_threadsafe_function_context(napi_threadsafe_function func,
void** result);
NAPI_EXTERN napi_status
napi_call_threadsafe_function(napi_threadsafe_function func,
void* data,
napi_threadsafe_function_call_mode is_blocking);
NAPI_EXTERN napi_status
napi_acquire_threadsafe_function(napi_threadsafe_function func);
NAPI_EXTERN napi_status
napi_release_threadsafe_function(napi_threadsafe_function func,
napi_threadsafe_function_release_mode mode);
NAPI_EXTERN napi_status
napi_unref_threadsafe_function(napi_env env, napi_threadsafe_function func);
NAPI_EXTERN napi_status
napi_ref_threadsafe_function(napi_env env, napi_threadsafe_function func);
#endif // __wasm32__
#endif // NAPI_VERSION >= 4
#ifdef NAPI_EXPERIMENTAL
NAPI_EXTERN napi_status napi_add_async_cleanup_hook(
napi_env env,
napi_async_cleanup_hook hook,
void* arg,
napi_async_cleanup_hook_handle* remove_handle);
NAPI_EXTERN napi_status napi_remove_async_cleanup_hook(
napi_async_cleanup_hook_handle remove_handle);
NAPI_EXTERN napi_status
node_api_get_module_file_name(napi_env env, const char** result);
#endif // NAPI_EXPERIMENTAL
EXTERN_C_END
#endif // SRC_NODE_API_H_