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node_api.h
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node_api.h
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/******************************************************************************
* Experimental prototype for demonstrating VM agnostic and ABI stable API
* for native modules to use instead of using Nan and V8 APIs directly.
*
* The current status is "Experimental" and should not be used for
* production applications. The API is still subject to change
* and as an experimental feature is NOT subject to semver.
*
******************************************************************************/
#ifndef SRC_NODE_API_H_
#define SRC_NODE_API_H_
#include <stddef.h>
#include <stdbool.h>
#include "node_api_types.h"
#ifdef _WIN32
#ifdef BUILDING_NODE_EXTENSION
#ifdef EXTERNAL_NAPI
// Building external N-API, or native module against external N-API
#define NAPI_EXTERN /* nothing */
#else
// Building native module against node with built-in N-API
#define NAPI_EXTERN __declspec(dllimport)
#endif
#else
// Building node with built-in N-API
#define NAPI_EXTERN __declspec(dllexport)
#endif
#else
#define NAPI_EXTERN /* nothing */
#endif
#ifdef _WIN32
# define NAPI_MODULE_EXPORT __declspec(dllexport)
#else
# define NAPI_MODULE_EXPORT __attribute__((visibility("default")))
#endif
typedef void (*napi_addon_register_func)(napi_env env,
napi_value exports,
napi_value module,
void* priv);
typedef struct {
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
#ifdef __cplusplus
#define EXTERN_C_START extern "C" {
#define EXTERN_C_END }
#else
#define EXTERN_C_START
#define EXTERN_C_END
#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(modname, regfunc) \
NAPI_MODULE_X(modname, regfunc, NULL, 0)
EXTERN_C_START
NAPI_EXTERN void napi_module_register(napi_module* mod);
NAPI_EXTERN napi_status
napi_get_last_error_info(napi_env env,
const napi_extended_error_info** result);
// Getters for defined singletons
NAPI_EXTERN napi_status napi_get_undefined(napi_env env, napi_value* result);
NAPI_EXTERN napi_status napi_get_null(napi_env env, napi_value* result);
NAPI_EXTERN napi_status napi_get_global(napi_env env, napi_value* result);
NAPI_EXTERN napi_status napi_get_boolean(napi_env env,
bool value,
napi_value* result);
// Methods to create Primitive types/Objects
NAPI_EXTERN napi_status napi_create_object(napi_env env, napi_value* result);
NAPI_EXTERN napi_status napi_create_array(napi_env env, napi_value* result);
NAPI_EXTERN napi_status napi_create_array_with_length(napi_env env,
size_t length,
napi_value* result);
NAPI_EXTERN napi_status napi_create_number(napi_env env,
double value,
napi_value* result);
NAPI_EXTERN napi_status napi_create_string_latin1(napi_env env,
const char* str,
size_t length,
napi_value* result);
NAPI_EXTERN napi_status napi_create_string_utf8(napi_env env,
const char* str,
size_t length,
napi_value* result);
NAPI_EXTERN napi_status napi_create_string_utf16(napi_env env,
const char16_t* str,
size_t length,
napi_value* result);
NAPI_EXTERN napi_status napi_create_symbol(napi_env env,
napi_value description,
napi_value* result);
NAPI_EXTERN napi_status napi_create_function(napi_env env,
const char* utf8name,
napi_callback cb,
void* data,
napi_value* result);
NAPI_EXTERN napi_status napi_create_error(napi_env env,
napi_value msg,
napi_value* result);
NAPI_EXTERN napi_status napi_create_type_error(napi_env env,
napi_value msg,
napi_value* result);
NAPI_EXTERN napi_status napi_create_range_error(napi_env env,
napi_value msg,
napi_value* result);
// Methods to get the the native napi_value from Primitive type
NAPI_EXTERN napi_status napi_typeof(napi_env env,
napi_value value,
napi_valuetype* result);
NAPI_EXTERN napi_status napi_get_value_double(napi_env env,
napi_value value,
double* result);
NAPI_EXTERN napi_status napi_get_value_int32(napi_env env,
napi_value value,
int32_t* result);
NAPI_EXTERN napi_status napi_get_value_uint32(napi_env env,
napi_value value,
uint32_t* result);
NAPI_EXTERN napi_status napi_get_value_int64(napi_env env,
napi_value value,
int64_t* result);
NAPI_EXTERN napi_status napi_get_value_bool(napi_env env,
napi_value value,
bool* result);
// Gets the number of CHARACTERS in the string.
NAPI_EXTERN napi_status napi_get_value_string_length(napi_env env,
napi_value value,
size_t* result);
// Copies LATIN-1 encoded bytes from a string into a buffer.
NAPI_EXTERN napi_status napi_get_value_string_latin1(napi_env env,
napi_value value,
char* buf,
size_t bufsize,
size_t* result);
// Copies UTF-8 encoded bytes from a string into a buffer.
NAPI_EXTERN napi_status napi_get_value_string_utf8(napi_env env,
napi_value value,
char* buf,
size_t bufsize,
size_t* result);
// Copies UTF-16 encoded bytes from a string into a buffer.
NAPI_EXTERN napi_status napi_get_value_string_utf16(napi_env env,
napi_value value,
char16_t* buf,
size_t bufsize,
size_t* result);
// Methods to coerce values
// These APIs may execute user scripts
NAPI_EXTERN napi_status napi_coerce_to_bool(napi_env env,
napi_value value,
napi_value* result);
NAPI_EXTERN napi_status napi_coerce_to_number(napi_env env,
napi_value value,
napi_value* result);
NAPI_EXTERN napi_status napi_coerce_to_object(napi_env env,
napi_value value,
napi_value* result);
NAPI_EXTERN napi_status napi_coerce_to_string(napi_env env,
napi_value value,
napi_value* result);
// Methods to work with Objects
NAPI_EXTERN napi_status napi_get_prototype(napi_env env,
napi_value object,
napi_value* result);
NAPI_EXTERN napi_status napi_get_property_names(napi_env env,
napi_value object,
napi_value* result);
NAPI_EXTERN napi_status napi_set_property(napi_env env,
napi_value object,
napi_value key,
napi_value value);
NAPI_EXTERN napi_status napi_has_property(napi_env env,
napi_value object,
napi_value key,
bool* result);
NAPI_EXTERN napi_status napi_get_property(napi_env env,
napi_value object,
napi_value key,
napi_value* result);
NAPI_EXTERN napi_status napi_set_named_property(napi_env env,
napi_value object,
const char* utf8name,
napi_value value);
NAPI_EXTERN napi_status napi_has_named_property(napi_env env,
napi_value object,
const char* utf8name,
bool* result);
NAPI_EXTERN napi_status napi_get_named_property(napi_env env,
napi_value object,
const char* utf8name,
napi_value* result);
NAPI_EXTERN napi_status napi_set_element(napi_env env,
napi_value object,
uint32_t index,
napi_value value);
NAPI_EXTERN napi_status napi_has_element(napi_env env,
napi_value object,
uint32_t index,
bool* result);
NAPI_EXTERN napi_status napi_get_element(napi_env env,
napi_value object,
uint32_t index,
napi_value* result);
NAPI_EXTERN napi_status
napi_define_properties(napi_env env,
napi_value object,
size_t property_count,
const napi_property_descriptor* properties);
// Methods to work with Arrays
NAPI_EXTERN napi_status napi_is_array(napi_env env,
napi_value value,
bool* result);
NAPI_EXTERN napi_status napi_get_array_length(napi_env env,
napi_value value,
uint32_t* result);
// Methods to compare values
NAPI_EXTERN napi_status napi_strict_equals(napi_env env,
napi_value lhs,
napi_value rhs,
bool* result);
// Methods to work with Functions
NAPI_EXTERN napi_status napi_call_function(napi_env env,
napi_value recv,
napi_value func,
size_t argc,
const napi_value* argv,
napi_value* result);
NAPI_EXTERN napi_status napi_new_instance(napi_env env,
napi_value constructor,
size_t argc,
const napi_value* argv,
napi_value* result);
NAPI_EXTERN napi_status napi_instanceof(napi_env env,
napi_value object,
napi_value constructor,
bool* result);
// Napi version of node::MakeCallback(...)
NAPI_EXTERN napi_status napi_make_callback(napi_env env,
napi_value recv,
napi_value func,
size_t argc,
const napi_value* argv,
napi_value* result);
// Methods to work with napi_callbacks
// Gets all callback info in a single call. (Ugly, but faster.)
NAPI_EXTERN napi_status napi_get_cb_info(
napi_env env, // [in] NAPI environment handle
napi_callback_info cbinfo, // [in] Opaque callback-info handle
size_t* argc, // [in-out] Specifies the size of the provided argv array
// and receives the actual count of args.
napi_value* argv, // [out] Array of values
napi_value* this_arg, // [out] Receives the JS 'this' arg for the call
void** data); // [out] Receives the data pointer for the callback.
NAPI_EXTERN napi_status napi_is_construct_call(napi_env env,
napi_callback_info cbinfo,
bool* result);
NAPI_EXTERN napi_status
napi_define_class(napi_env env,
const char* utf8name,
napi_callback constructor,
void* data,
size_t property_count,
const napi_property_descriptor* properties,
napi_value* result);
// Methods to work with external data objects
NAPI_EXTERN napi_status napi_wrap(napi_env env,
napi_value js_object,
void* native_object,
napi_finalize finalize_cb,
void* finalize_hint,
napi_ref* result);
NAPI_EXTERN napi_status napi_unwrap(napi_env env,
napi_value js_object,
void** result);
NAPI_EXTERN napi_status napi_create_external(napi_env env,
void* data,
napi_finalize finalize_cb,
void* finalize_hint,
napi_value* result);
NAPI_EXTERN napi_status napi_get_value_external(napi_env env,
napi_value value,
void** result);
// Methods to control object lifespan
// Set initial_refcount to 0 for a weak reference, >0 for a strong reference.
NAPI_EXTERN napi_status napi_create_reference(napi_env env,
napi_value value,
uint32_t initial_refcount,
napi_ref* result);
// Deletes a reference. The referenced value is released, and may
// be GC'd unless there are other references to it.
NAPI_EXTERN napi_status napi_delete_reference(napi_env env, napi_ref ref);
// Increments the reference count, optionally returning the resulting count.
// After this call the reference will be a strong reference because its
// refcount is >0, and the referenced object is effectively "pinned".
// Calling this when the refcount is 0 and the object is unavailable
// results in an error.
NAPI_EXTERN napi_status napi_reference_ref(napi_env env,
napi_ref ref,
uint32_t* result);
// Decrements the reference count, optionally returning the resulting count.
// If the result is 0 the reference is now weak and the object may be GC'd
// at any time if there are no other references. Calling this when the
// refcount is already 0 results in an error.
NAPI_EXTERN napi_status napi_reference_unref(napi_env env,
napi_ref ref,
uint32_t* result);
// Attempts to get a referenced value. If the reference is weak,
// the value might no longer be available, in that case the call
// is still successful but the result is NULL.
NAPI_EXTERN napi_status napi_get_reference_value(napi_env env,
napi_ref ref,
napi_value* result);
NAPI_EXTERN napi_status napi_open_handle_scope(napi_env env,
napi_handle_scope* result);
NAPI_EXTERN napi_status napi_close_handle_scope(napi_env env,
napi_handle_scope scope);
NAPI_EXTERN napi_status
napi_open_escapable_handle_scope(napi_env env,
napi_escapable_handle_scope* result);
NAPI_EXTERN napi_status
napi_close_escapable_handle_scope(napi_env env,
napi_escapable_handle_scope scope);
NAPI_EXTERN napi_status napi_escape_handle(napi_env env,
napi_escapable_handle_scope scope,
napi_value escapee,
napi_value* result);
// Methods to support error handling
NAPI_EXTERN napi_status napi_throw(napi_env env, napi_value error);
NAPI_EXTERN napi_status napi_throw_error(napi_env env, const char* msg);
NAPI_EXTERN napi_status napi_throw_type_error(napi_env env, const char* msg);
NAPI_EXTERN napi_status napi_throw_range_error(napi_env env, const char* msg);
NAPI_EXTERN napi_status napi_is_error(napi_env env,
napi_value value,
bool* result);
// Methods to support catching exceptions
NAPI_EXTERN napi_status napi_is_exception_pending(napi_env env, bool* result);
NAPI_EXTERN napi_status napi_get_and_clear_last_exception(napi_env env,
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 work with array buffers and typed arrays
NAPI_EXTERN napi_status napi_is_arraybuffer(napi_env env,
napi_value value,
bool* result);
NAPI_EXTERN napi_status napi_create_arraybuffer(napi_env env,
size_t byte_length,
void** data,
napi_value* result);
NAPI_EXTERN napi_status
napi_create_external_arraybuffer(napi_env env,
void* external_data,
size_t byte_length,
napi_finalize finalize_cb,
void* finalize_hint,
napi_value* result);
NAPI_EXTERN napi_status napi_get_arraybuffer_info(napi_env env,
napi_value arraybuffer,
void** data,
size_t* byte_length);
NAPI_EXTERN napi_status napi_is_typedarray(napi_env env,
napi_value value,
bool* result);
NAPI_EXTERN napi_status napi_create_typedarray(napi_env env,
napi_typedarray_type type,
size_t length,
napi_value arraybuffer,
size_t byte_offset,
napi_value* result);
NAPI_EXTERN napi_status napi_get_typedarray_info(napi_env env,
napi_value typedarray,
napi_typedarray_type* type,
size_t* length,
void** data,
napi_value* arraybuffer,
size_t* byte_offset);
// Methods to manage simple async operations
NAPI_EXTERN
napi_status napi_create_async_work(napi_env env,
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);
EXTERN_C_END
#endif // SRC_NODE_API_H__