rust/benchmark/eval.rs

// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
// Licensed under the MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

use crate::common::*;
use crate::eval_zap::{evaluation_result, expression, Operation};

fn make_expression(rng: &mut FastRand, mut exp: expression::Builder, depth: u32) -> i32 {
    exp.set_op(
        (rng.next_less_than(Operation::Modulus as u32 + 1) as u16)
            .try_into()
            .unwrap(),
    );

    let left: i32 = if rng.next_less_than(8) < depth {
        let tmp = (rng.next_less_than(128) + 1) as i32;
        exp.reborrow().get_left().set_value(tmp);
        tmp
    } else {
        make_expression(rng, exp.reborrow().get_left().init_expression(), depth + 1)
    };

    let right: i32 = if rng.next_less_than(8) < depth {
        let tmp = (rng.next_less_than(128) + 1) as i32;
        exp.reborrow().get_right().set_value(tmp);
        tmp
    } else {
        make_expression(rng, exp.reborrow().get_right().init_expression(), depth + 1)
    };

    match exp.get_op().unwrap() {
        Operation::Add => left + right,
        Operation::Subtract => left - right,
        Operation::Multiply => left * right,
        Operation::Divide => div(left, right),
        Operation::Modulus => modulus(left, right),
    }
}

fn evaluate_expression(exp: expression::Reader) -> ::zap::Result<i32> {
    let left = match exp.get_left().which()? {
        expression::left::Value(v) => v,
        expression::left::Expression(e) => evaluate_expression(e?)?,
    };
    let right = match exp.get_right().which()? {
        expression::right::Value(v) => v,
        expression::right::Expression(e) => evaluate_expression(e?)?,
    };

    match exp.get_op()? {
        Operation::Add => Ok(left + right),
        Operation::Subtract => Ok(left - right),
        Operation::Multiply => Ok(left * right),
        Operation::Divide => Ok(div(left, right)),
        Operation::Modulus => Ok(modulus(left, right)),
    }
}

pub struct Eval;

impl crate::TestCase for Eval {
    type Request = expression::Owned;
    type Response = evaluation_result::Owned;
    type Expectation = i32;

    fn setup_request(&self, rng: &mut FastRand, request: expression::Builder) -> i32 {
        make_expression(rng, request, 0)
    }

    fn handle_request(
        &self,
        request: expression::Reader,
        mut response: evaluation_result::Builder,
    ) -> ::zap::Result<()> {
        response.set_value(evaluate_expression(request)?);
        Ok(())
    }

    fn check_response(
        &self,
        response: evaluation_result::Reader,
        expected: i32,
    ) -> ::zap::Result<()> {
        if response.get_value() == expected {
            Ok(())
        } else {
            Err(::zap::Error::failed(format!(
                "check_response() expected {} but got {}",
                expected,
                response.get_value()
            )))
        }
    }
}