_CJavaScriptKit.h

#ifndef _CJavaScriptKit_h
#define _CJavaScriptKit_h

#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>

/// `JavaScriptObjectRef` represents JavaScript object reference that is referenced by Swift side.
/// This value is an address of `SwiftRuntimeHeap`.
typedef unsigned int JavaScriptObjectRef;
/// `JavaScriptHostFuncRef` represents Swift closure that is referenced by JavaScript side.
/// This value is produced by `JSClosure`.
typedef uintptr_t JavaScriptHostFuncRef;

/// `JavaScriptValueKind` represents the kind of JavaScript primitive value.
typedef enum __attribute__((enum_extensibility(closed))) {
  JavaScriptValueKindBoolean = 0,
  JavaScriptValueKindString = 1,
  JavaScriptValueKindNumber = 2,
  JavaScriptValueKindObject = 3,
  JavaScriptValueKindNull = 4,
  JavaScriptValueKindUndefined = 5,
  JavaScriptValueKindFunction = 6,
  JavaScriptValueKindSymbol = 7,
  JavaScriptValueKindBigInt = 8,
} JavaScriptValueKind;

typedef struct {
  JavaScriptValueKind kind: 31;
  bool isException: 1;
} JavaScriptValueKindAndFlags;

typedef unsigned JavaScriptPayload1;
typedef double JavaScriptPayload2;

/// `RawJSValue` is abstract representaion of JavaScript primitive value.
///
/// For boolean value:
///    payload1: 1 or 0
///    payload2: 0
///
/// For string value:
///    payload1: `JavaScriptObjectRef` of string
///    payload2: 0
///
/// For number value:
///    payload1: 0
///    payload2: double number
///
/// For object value:
///    payload1: `JavaScriptObjectRef`
///    payload2: 0
/// For null value:
///    payload1: 0
///    payload2: 0
///
/// For undefined value:
///    payload1: 0
///    payload2: 0
///
/// For function value:
///    payload1: the target `JavaScriptHostFuncRef`
///    payload2: 0
///
/// For symbol and bigint values:
///    payload1: `JavaScriptObjectRef`
///    payload2: 0
///
typedef struct {
  JavaScriptValueKind kind;
  JavaScriptPayload1 payload1;
  JavaScriptPayload2 payload2;
} RawJSValue;

#if __wasm32__

/// `_set_prop` sets a value of `_this` JavaScript object.
///
/// @param _this The target JavaScript object to set the given value.
/// @param prop A JavaScript string object to reference a member of `_this` object.
/// @param kind A kind of JavaScript value to set the target object.
/// @param payload1 The first payload of JavaScript value to set the target object.
/// @param payload2 The second payload of JavaScript value to set the target object.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_set_prop")))
extern void _set_prop(const JavaScriptObjectRef _this,
                      const JavaScriptObjectRef prop,
                      const JavaScriptValueKind kind,
                      const JavaScriptPayload1 payload1,
                      const JavaScriptPayload2 payload2);

/// `_get_prop` gets a value of `_this` JavaScript object.
///
/// @param _this The target JavaScript object to get its member value.
/// @param prop A JavaScript string object to reference a member of `_this` object.
/// @param payload1 A result pointer of first payload of JavaScript value to set the target object.
/// @param payload2 A result pointer of second payload of JavaScript value to set the target object.
/// @return A `JavaScriptValueKind` bits represented as 32bit integer for the returned value.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_get_prop")))
extern uint32_t _get_prop(
  const JavaScriptObjectRef _this,
  const JavaScriptObjectRef prop,
  JavaScriptPayload1 *payload1,
  JavaScriptPayload2 *payload2
);

/// `_set_subscript` sets a value of `_this` JavaScript object.
///
/// @param _this The target JavaScript object to set its member value.
/// @param index A subscript index to set value.
/// @param kind A kind of JavaScript value to set the target object.
/// @param payload1 The first payload of JavaScript value to set the target object.
/// @param payload2 The second payload of JavaScript value to set the target object.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_set_subscript")))
extern void _set_subscript(const JavaScriptObjectRef _this,
                           const int index,
                           const JavaScriptValueKind kind,
                           const JavaScriptPayload1 payload1,
                           const JavaScriptPayload2 payload2);

/// `_get_subscript` gets a value of `_this` JavaScript object.
///
/// @param _this The target JavaScript object to get its member value.
/// @param index A subscript index to get value.
/// @param payload1 A result pointer of first payload of JavaScript value to get the target object.
/// @param payload2 A result pointer of second payload of JavaScript value to get the target object.
/// @return A `JavaScriptValueKind` bits represented as 32bit integer for the returned value.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_get_subscript")))
extern uint32_t _get_subscript(
  const JavaScriptObjectRef _this,
  const int index,
  JavaScriptPayload1 *payload1,
  JavaScriptPayload2 *payload2
);

/// `_encode_string` encodes the `str_obj` to bytes sequence and returns the length of bytes.
///
/// @param str_obj A JavaScript string object ref to encode.
/// @param bytes_result A result pointer of bytes sequence representation in JavaScript.
///                    This value will be used to load the actual bytes using `_load_string`.
/// @result The length of bytes sequence. This value will be used to allocate Swift side string buffer to load the actual bytes.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_encode_string")))
extern int _encode_string(const JavaScriptObjectRef str_obj, JavaScriptObjectRef *bytes_result);

/// `_decode_string` decodes the given bytes sequence into JavaScript string object.
///
/// @param bytes_ptr A `uint8_t` byte sequence to decode.
/// @param length The length of `bytes_ptr`.
/// @result The decoded JavaScript string object.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_decode_string")))
extern JavaScriptObjectRef _decode_string(const unsigned char *bytes_ptr, const int length);

/// `_load_string` loads the actual bytes sequence of `bytes` into `buffer` which is a Swift side memory address.
///
/// @param bytes A bytes sequence representation in JavaScript to load. This value should be derived from `_encode_string`.
/// @param buffer A Swift side string buffer to load the bytes.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_load_string")))
extern void _load_string(const JavaScriptObjectRef bytes, unsigned char *buffer);

/// Converts the provided Int64 or UInt64 to a BigInt in slow path by splitting 64bit integer to two 32bit integers
/// to avoid depending on [JS-BigInt-integration](https://github.com/WebAssembly/JS-BigInt-integration) feature
///
/// @param lower The lower 32bit of the value to convert.
/// @param upper The upper 32bit of the value to convert.
/// @param is_signed Whether to treat the value as a signed integer or not.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_i64_to_bigint_slow")))
extern JavaScriptObjectRef _i64_to_bigint_slow(unsigned int lower, unsigned int upper, bool is_signed);

/// `_call_function` calls JavaScript function with given arguments list.
///
/// @param ref The target JavaScript function to call.
/// @param argv A list of `RawJSValue` arguments to apply.
/// @param argc The length of `argv``.
/// @param result_payload1 A result pointer of first payload of JavaScript value of returned result or thrown exception.
/// @param result_payload2 A result pointer of second payload of JavaScript value of returned result or thrown exception.
/// @return A `JavaScriptValueKindAndFlags` bits represented as 32bit integer for the returned value.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_call_function")))
extern uint32_t _call_function(
  const JavaScriptObjectRef ref, const RawJSValue *argv,
  const int argc,
  JavaScriptPayload1 *result_payload1,
  JavaScriptPayload2 *result_payload2
);

/// `_call_function` calls JavaScript function with given arguments list without capturing any exception
///
/// @param ref The target JavaScript function to call.
/// @param argv A list of `RawJSValue` arguments to apply.
/// @param argc The length of `argv``.
/// @param result_payload1 A result pointer of first payload of JavaScript value of returned result or thrown exception.
/// @param result_payload2 A result pointer of second payload of JavaScript value of returned result or thrown exception.
/// @return A `JavaScriptValueKindAndFlags` bits represented as 32bit integer for the returned value.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_call_function_no_catch")))
extern uint32_t _call_function_no_catch(
  const JavaScriptObjectRef ref, const RawJSValue *argv,
  const int argc,
  JavaScriptPayload1 *result_payload1,
  JavaScriptPayload2 *result_payload2
);

/// `_call_function_with_this` calls JavaScript function with given arguments list and given `_this`.
///
/// @param _this The value of `this` provided for the call to `func_ref`.
/// @param func_ref The target JavaScript function to call.
/// @param argv A list of `RawJSValue` arguments to apply.
/// @param argc The length of `argv``.
/// @param result_payload1 A result pointer of first payload of JavaScript value of returned result or thrown exception.
/// @param result_payload2 A result pointer of second payload of JavaScript value of returned result or thrown exception.
/// @return A `JavaScriptValueKindAndFlags` bits represented as 32bit integer for the returned value.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_call_function_with_this")))
extern uint32_t _call_function_with_this(
  const JavaScriptObjectRef _this,
  const JavaScriptObjectRef func_ref,
  const RawJSValue *argv, const int argc,
  JavaScriptPayload1 *result_payload1,
  JavaScriptPayload2 *result_payload2
);

/// `_call_function_with_this` calls JavaScript function with given arguments list and given `_this` without capturing any exception.
///
/// @param _this The value of `this` provided for the call to `func_ref`.
/// @param func_ref The target JavaScript function to call.
/// @param argv A list of `RawJSValue` arguments to apply.
/// @param argc The length of `argv``.
/// @param result_payload1 A result pointer of first payload of JavaScript value of returned result or thrown exception.
/// @param result_payload2 A result pointer of second payload of JavaScript value of returned result or thrown exception.
/// @return A `JavaScriptValueKindAndFlags` bits represented as 32bit integer for the returned value.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_call_function_with_this_no_catch")))
extern uint32_t _call_function_with_this_no_catch(
  const JavaScriptObjectRef _this,
  const JavaScriptObjectRef func_ref,
  const RawJSValue *argv, const int argc,
  JavaScriptPayload1 *result_payload1,
  JavaScriptPayload2 *result_payload2
);

/// `_call_new` calls JavaScript object constructor with given arguments list.
///
/// @param ref The target JavaScript constructor to call.
/// @param argv A list of `RawJSValue` arguments to apply.
/// @param argc The length of `argv``.
/// @returns A reference to the constructed object.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_call_new")))
extern JavaScriptObjectRef _call_new(const JavaScriptObjectRef ref,
                                     const RawJSValue *argv, const int argc);

/// `_call_throwing_new` calls JavaScript object constructor with given arguments list.
///
/// @param ref The target JavaScript constructor to call.
/// @param argv A list of `RawJSValue` arguments to apply.
/// @param argc The length of `argv``.
/// @param exception_kind A result pointer of JavaScript value kind of thrown exception.
/// @param exception_payload1 A result pointer of first payload of JavaScript value of thrown exception.
/// @param exception_payload2 A result pointer of second payload of JavaScript value of thrown exception.
/// @returns A reference to the constructed object.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_call_throwing_new")))
extern JavaScriptObjectRef _call_throwing_new(const JavaScriptObjectRef ref,
                                              const RawJSValue *argv, const int argc,
                                              JavaScriptValueKindAndFlags *exception_kind,
                                              JavaScriptPayload1 *exception_payload1,
                                              JavaScriptPayload2 *exception_payload2);

/// `_instanceof` acts like JavaScript `instanceof` operator.
///
/// @param obj The target object to check its prototype chain.
/// @param constructor The `constructor` object to check against.
/// @result Return `true` if `constructor` appears anywhere in the prototype chain of `obj`. Return `false` if not.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_instanceof")))
extern bool _instanceof(const JavaScriptObjectRef obj,
                        const JavaScriptObjectRef constructor);

/// `_create_function` creates a JavaScript thunk function that calls Swift side closure.
/// See also comments on JSFunction.swift
///
/// @param host_func_id The target Swift side function called by the created thunk function.
/// @param line The line where the function is created. Will be used for diagnostics
/// @param file The file name where the function is created. Will be used for diagnostics
/// @returns A reference to the newly-created JavaScript thunk function
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_create_function")))
extern JavaScriptObjectRef _create_function(const JavaScriptHostFuncRef host_func_id,
                                            unsigned int line, JavaScriptObjectRef file);

/// Instantiate a new `TypedArray` object with given elements
/// This is used to provide an efficient way to create `TypedArray`.
///
/// @param constructor The `TypedArray` constructor.
/// @param elements_ptr The elements pointer to initialize. They are assumed to be the same size of `constructor` elements size.
/// @param length The length of `elements_ptr`
/// @returns A reference to the constructed typed array
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_create_typed_array")))
extern JavaScriptObjectRef _create_typed_array(const JavaScriptObjectRef constructor,
                                               const void *elements_ptr, const int length);

/// Copies the byte contents of a typed array into a Swift side memory buffer.
///
/// @param ref A JavaScript typed array object.
/// @param buffer A Swift side buffer into which to copy the bytes.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_load_typed_array")))
extern void _load_typed_array(const JavaScriptObjectRef ref, unsigned char *buffer);

/// Decrements reference count of `ref` retained by `SwiftRuntimeHeap` in JavaScript side.
///
/// @param ref The target JavaScript object.
__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_release")))
extern void _release(const JavaScriptObjectRef ref);

__attribute__((__import_module__("javascript_kit"),
               __import_name__("swjs_unsafe_event_loop_yield")))
extern void _unsafe_event_loop_yield(void);

#endif

#endif /* _CJavaScriptKit_h */