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101 lines
2.6 KiB
Rust
101 lines
2.6 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use crate::*;
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#[repr(C)]
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#[derive(Debug)]
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pub struct CallbackInfo {
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pub env: napi_env,
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pub cb: napi_callback,
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pub cb_info: napi_callback_info,
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pub args: *const c_void,
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}
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impl CallbackInfo {
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#[inline]
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pub fn new_raw(
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env: napi_env,
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cb: napi_callback,
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cb_info: napi_callback_info,
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) -> *mut Self {
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Box::into_raw(Box::new(Self {
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env,
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cb,
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cb_info,
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args: std::ptr::null(),
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}))
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}
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}
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extern "C" fn call_fn(info: *const v8::FunctionCallbackInfo) {
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let info = unsafe { &*info };
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let args = v8::FunctionCallbackArguments::from_function_callback_info(info);
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let mut rv = v8::ReturnValue::from_function_callback_info(info);
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// SAFETY: create_function guarantees that the data is a CallbackInfo external.
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let info_ptr: *mut CallbackInfo = unsafe {
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let external_value = v8::Local::<v8::External>::cast(args.data());
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external_value.value() as _
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};
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// SAFETY: pointer from Box::into_raw.
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let info = unsafe { &mut *info_ptr };
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info.args = &args as *const _ as *const c_void;
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if let Some(f) = info.cb {
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// SAFETY: calling user provided function pointer.
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let value = unsafe { f(info.env, info_ptr as *mut _) };
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// SAFETY: napi_value is represented as v8::Local<v8::Value> internally.
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rv.set(unsafe { transmute::<napi_value, v8::Local<v8::Value>>(value) });
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}
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}
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#[allow(clippy::not_unsafe_ptr_arg_deref)]
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pub fn create_function<'a>(
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env_ptr: *mut Env,
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name: Option<v8::Local<v8::String>>,
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cb: napi_callback,
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cb_info: napi_callback_info,
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) -> v8::Local<'a, v8::Function> {
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let env: &mut Env = unsafe { &mut *env_ptr };
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let scope = &mut env.scope();
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let external = v8::External::new(
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scope,
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CallbackInfo::new_raw(env_ptr as _, cb, cb_info) as *mut _,
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);
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let function = v8::Function::builder_raw(call_fn)
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.data(external.into())
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.build(scope)
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.unwrap();
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if let Some(v8str) = name {
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function.set_name(v8str);
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}
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function
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}
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#[allow(clippy::not_unsafe_ptr_arg_deref)]
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pub fn create_function_template<'a>(
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env_ptr: *mut Env,
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name: Option<&str>,
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cb: napi_callback,
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cb_info: napi_callback_info,
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) -> v8::Local<'a, v8::FunctionTemplate> {
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let env: &mut Env = unsafe { &mut *env_ptr };
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let scope = &mut env.scope();
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let external = v8::External::new(
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scope,
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CallbackInfo::new_raw(env_ptr as _, cb, cb_info) as *mut _,
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);
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let function = v8::FunctionTemplate::builder_raw(call_fn)
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.data(external.into())
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.build(scope);
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if let Some(name) = name {
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let v8str = v8::String::new(scope, name).unwrap();
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function.set_class_name(v8str);
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}
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function
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}
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