starlark 0.13.0

An implementation of the Starlark language in Rust.
Documentation 
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/*
 * Copyright 2019 The Starlark in Rust Authors.
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

use allocative::Allocative;
use dupe::Dupe;

use crate::eval::Arguments;
use crate::eval::Evaluator;
use crate::values::function::NativeFunc;
use crate::values::function::NativeFunction;
use crate::values::FrozenRef;
use crate::values::FrozenValueTyped;
use crate::values::Value;

/// Pointer to a native function optimized for bytecode execution.
#[derive(Copy, Clone, Dupe, Allocative)]
pub(crate) struct BcNativeFunction {
    fun: FrozenValueTyped<'static, NativeFunction>,
    /// Copy function here from `fun` to avoid extra dereference when calling.
    imp: FrozenRef<'static, dyn NativeFunc>,
}

impl BcNativeFunction {
    pub(crate) fn new(fun: FrozenValueTyped<'static, NativeFunction>) -> BcNativeFunction {
        let imp = fun.as_frozen_ref().map(|f| &*f.function);
        BcNativeFunction { fun, imp }
    }

    #[inline]
    pub(crate) fn fun(&self) -> FrozenValueTyped<'static, NativeFunction> {
        self.fun
    }

    #[inline]
    pub(crate) fn to_value<'v>(&self) -> Value<'v> {
        self.fun.to_value()
    }

    #[inline]
    pub(crate) fn invoke<'v>(
        &self,
        args: &Arguments<'v, '_>,
        eval: &mut Evaluator<'v, '_, '_>,
    ) -> crate::Result<Value<'v>> {
        self.imp.invoke(eval, args)
    }
}