kjuulh/rhai
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Add unchecked feature to remove arithmetic operations checking.

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This commit is contained in:
Stephen Chung 2020-03-08 23:14:18 +08:00
parent b1b25d3043
commit c5b40783ef
4 changed files with 124 additions and 53 deletions
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1
Cargo.toml
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@ -20,3 +20,4 @@ num-traits = "*"
[features]
debug_msgs = []
no_stdlib = []
unchecked = []

6
README.md
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@ -9,7 +9,7 @@ Rhai's current feature set:
* Low compile-time overhead (~0.6 sec debug/~3 sec release for script runner app)
* Easy-to-use language similar to JS+Rust
* Support for overloaded functions
* No additional dependencies
* Very few additional dependencies (right now only `num-traits` to do checked arithmetic operations)
**Note:** Currently, the version is 0.10.2, so the language and API's may change before they stabilize.
@ -43,6 +43,10 @@ Print debug messages to stdout (using `println!`) related to function registrati
Exclude the standard library of utility functions in the build, and only include the minimum necessary functionalities.
### `unchecked`
Exclude arithmetic checking in the standard library. Beware that a bad script may panic the entire system!
## Related
Other cool projects to check out:

113
src/builtin.rs
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@ -3,15 +3,23 @@
use crate::any::Any;
use crate::engine::{Array, Engine};
use crate::fn_register::{RegisterFn, RegisterResultFn};
use crate::parser::Position;
use crate::result::EvalAltResult;
use crate::fn_register::RegisterFn;
use std::fmt::{Debug, Display};
use std::ops::{Add, BitAnd, BitOr, BitXor, Div, Mul, Neg, Range, Rem, Sub};
#[cfg(feature = "unchecked")]
use std::ops::{Shl, Shr};
#[cfg(not(feature = "unchecked"))]
use crate::{parser::Position, result::EvalAltResult, RegisterResultFn};
#[cfg(not(feature = "unchecked"))]
use std::convert::TryFrom;
#[cfg(not(feature = "unchecked"))]
use num_traits::{
CheckedAdd, CheckedDiv, CheckedMul, CheckedNeg, CheckedRem, CheckedShl, CheckedShr, CheckedSub,
};
use std::convert::TryFrom;
use std::fmt::{Debug, Display};
use std::ops::{Add, BitAnd, BitOr, BitXor, Div, Mul, Neg, Range, Rem, Sub};
macro_rules! reg_op {
($self:expr, $x:expr, $op:expr, $( $y:ty ),*) => (
@ -21,6 +29,7 @@ macro_rules! reg_op {
)
}
#[cfg(not(feature = "unchecked"))]
macro_rules! reg_op_result {
($self:expr, $x:expr, $op:expr, $( $y:ty ),*) => (
$(
@ -29,6 +38,7 @@ macro_rules! reg_op_result {
)
}
#[cfg(not(feature = "unchecked"))]
macro_rules! reg_op_result1 {
($self:expr, $x:expr, $op:expr, $v:ty, $( $y:ty ),*) => (
$(
@ -45,6 +55,7 @@ macro_rules! reg_un {
)
}
#[cfg(not(feature = "unchecked"))]
macro_rules! reg_un_result {
($self:expr, $x:expr, $op:expr, $( $y:ty ),*) => (
$(
@ -98,6 +109,7 @@ macro_rules! reg_func3 {
impl Engine<'_> {
/// Register the core built-in library.
pub(crate) fn register_core_lib(&mut self) {
#[cfg(not(feature = "unchecked"))]
fn add<T: Display + CheckedAdd>(x: T, y: T) -> Result<T, EvalAltResult> {
x.checked_add(&y).ok_or_else(|| {
EvalAltResult::ErrorArithmetic(
@ -106,6 +118,7 @@ impl Engine<'_> {
)
})
}
#[cfg(not(feature = "unchecked"))]
fn sub<T: Display + CheckedSub>(x: T, y: T) -> Result<T, EvalAltResult> {
x.checked_sub(&y).ok_or_else(|| {
EvalAltResult::ErrorArithmetic(
@ -114,6 +127,7 @@ impl Engine<'_> {
)
})
}
#[cfg(not(feature = "unchecked"))]
fn mul<T: Display + CheckedMul>(x: T, y: T) -> Result<T, EvalAltResult> {
x.checked_mul(&y).ok_or_else(|| {
EvalAltResult::ErrorArithmetic(
@ -122,6 +136,7 @@ impl Engine<'_> {
)
})
}
#[cfg(not(feature = "unchecked"))]
fn div<T>(x: T, y: T) -> Result<T, EvalAltResult>
where
T: Display + CheckedDiv + PartialEq + TryFrom<i8>,
@ -143,6 +158,7 @@ impl Engine<'_> {
)
})
}
#[cfg(not(feature = "unchecked"))]
fn neg<T: Display + CheckedNeg>(x: T) -> Result<T, EvalAltResult> {
x.checked_neg().ok_or_else(|| {
EvalAltResult::ErrorArithmetic(
@ -151,6 +167,7 @@ impl Engine<'_> {
)
})
}
#[cfg(not(feature = "unchecked"))]
fn abs<T: Display + CheckedNeg + PartialOrd + From<i8>>(x: T) -> Result<T, EvalAltResult> {
if x >= 0.into() {
Ok(x)
@ -163,22 +180,22 @@ impl Engine<'_> {
})
}
}
fn add_unchecked<T: Add>(x: T, y: T) -> <T as Add>::Output {
fn add_u<T: Add>(x: T, y: T) -> <T as Add>::Output {
x + y
}
fn sub_unchecked<T: Sub>(x: T, y: T) -> <T as Sub>::Output {
fn sub_u<T: Sub>(x: T, y: T) -> <T as Sub>::Output {
x - y
}
fn mul_unchecked<T: Mul>(x: T, y: T) -> <T as Mul>::Output {
fn mul_u<T: Mul>(x: T, y: T) -> <T as Mul>::Output {
x * y
}
fn div_unchecked<T: Div>(x: T, y: T) -> <T as Div>::Output {
fn div_u<T: Div>(x: T, y: T) -> <T as Div>::Output {
x / y
}
fn neg_unchecked<T: Neg>(x: T) -> <T as Neg>::Output {
fn neg_u<T: Neg>(x: T) -> <T as Neg>::Output {
-x
}
fn abs_unchecked<T: Neg + PartialOrd + From<i8>>(x: T) -> T
fn abs_u<T: Neg + PartialOrd + From<i8>>(x: T) -> T
where
<T as Neg>::Output: Into<T>,
{
@ -224,7 +241,8 @@ impl Engine<'_> {
fn binary_xor<T: BitXor>(x: T, y: T) -> <T as BitXor>::Output {
x ^ y
}
fn left_shift<T: Display + CheckedShl>(x: T, y: i64) -> Result<T, EvalAltResult> {
#[cfg(not(feature = "unchecked"))]
fn shl<T: Display + CheckedShl>(x: T, y: i64) -> Result<T, EvalAltResult> {
if y < 0 {
return Err(EvalAltResult::ErrorArithmetic(
format!("Left-shift by a negative number: {} << {}", x, y),
@ -239,7 +257,8 @@ impl Engine<'_> {
)
})
}
fn right_shift<T: Display + CheckedShr>(x: T, y: i64) -> Result<T, EvalAltResult> {
#[cfg(not(feature = "unchecked"))]
fn shr<T: Display + CheckedShr>(x: T, y: i64) -> Result<T, EvalAltResult> {
if y < 0 {
return Err(EvalAltResult::ErrorArithmetic(
format!("Right-shift by a negative number: {} >> {}", x, y),
@ -254,6 +273,15 @@ impl Engine<'_> {
)
})
}
#[cfg(feature = "unchecked")]
fn shl_u<T: Shl<T>>(x: T, y: T) -> <T as Shl<T>>::Output {
x.shl(y)
}
#[cfg(feature = "unchecked")]
fn shr_u<T: Shr<T>>(x: T, y: T) -> <T as Shr<T>>::Output {
x.shr(y)
}
#[cfg(not(feature = "unchecked"))]
fn modulo<T: Display + CheckedRem>(x: T, y: T) -> Result<T, EvalAltResult> {
x.checked_rem(&y).ok_or_else(|| {
EvalAltResult::ErrorArithmetic(
@ -262,7 +290,7 @@ impl Engine<'_> {
)
})
}
fn modulo_unchecked<T: Rem>(x: T, y: T) -> <T as Rem>::Output {
fn modulo_u<T: Rem>(x: T, y: T) -> <T as Rem>::Output {
x % y
}
fn pow_i64_i64(x: i64, y: i64) -> i64 {
@ -275,15 +303,26 @@ impl Engine<'_> {
x.powi(y as i32)
}
#[cfg(not(feature = "unchecked"))]
{
reg_op_result!(self, "+", add, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op_result!(self, "-", sub, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op_result!(self, "*", mul, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op_result!(self, "/", div, i8, u8, i16, u16, i32, i64, u32, u64);
}
reg_op!(self, "+", add_unchecked, f32, f64);
reg_op!(self, "-", sub_unchecked, f32, f64);
reg_op!(self, "*", mul_unchecked, f32, f64);
reg_op!(self, "/", div_unchecked, f32, f64);
#[cfg(feature = "unchecked")]
{
reg_op!(self, "+", add_u, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op!(self, "-", sub_u, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op!(self, "*", mul_u, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op!(self, "/", div_u, i8, u8, i16, u16, i32, i64, u32, u64);
}
reg_op!(self, "+", add_u, f32, f64);
reg_op!(self, "-", sub_u, f32, f64);
reg_op!(self, "*", mul_u, f32, f64);
reg_op!(self, "/", div_u, f32, f64);
reg_cmp!(self, "<", lt, i8, u8, i16, u16, i32, i64, u32, u64, f32, f64, String, char);
reg_cmp!(self, "<=", lte, i8, u8, i16, u16, i32, i64, u32, u64, f32, f64, String, char);
@ -303,19 +342,43 @@ impl Engine<'_> {
reg_op!(self, "&", binary_and, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op!(self, "&", and, bool);
reg_op!(self, "^", binary_xor, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op_result1!(self, "<<", left_shift, i64, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op_result1!(self, ">>", right_shift, i64, i8, u8, i16, u16);
reg_op_result1!(self, ">>", right_shift, i64, i32, i64, u32, u64);
#[cfg(not(feature = "unchecked"))]
{
reg_op_result1!(self, "<<", shl, i64, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op_result1!(self, ">>", shr, i64, i8, u8, i16, u16);
reg_op_result1!(self, ">>", shr, i64, i32, i64, u32, u64);
reg_op_result!(self, "%", modulo, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op!(self, "%", modulo_unchecked, f32, f64);
}
#[cfg(feature = "unchecked")]
{
reg_op!(self, "<<", shl_u, i64, i8, u8, i16, u16, i32, i64, u32, u64);
reg_op!(self, ">>", shr_u, i64, i8, u8, i16, u16);
reg_op!(self, ">>", shr_u, i64, i32, i64, u32, u64);
reg_op!(self, "%", modulo_u, i8, u8, i16, u16, i32, i64, u32, u64);
}
reg_op!(self, "%", modulo_u, f32, f64);
self.register_fn("~", pow_i64_i64);
self.register_fn("~", pow_f64_f64);
self.register_fn("~", pow_f64_i64);
#[cfg(not(feature = "unchecked"))]
{
reg_un_result!(self, "-", neg, i8, i16, i32, i64);
reg_un!(self, "-", neg_unchecked, f32, f64);
reg_un_result!(self, "abs", abs, i8, i16, i32, i64);
reg_un!(self, "abs", abs_unchecked, f32, f64);
}
#[cfg(feature = "unchecked")]
{
reg_un!(self, "-", neg_u, i8, i16, i32, i64);
reg_un!(self, "abs", abs_u, i8, i16, i32, i64);
}
reg_un!(self, "-", neg_u, f32, f64);
reg_un!(self, "abs", abs_u, f32, f64);
reg_un!(self, "!", not, bool);
self.register_fn("+", |x: String, y: String| x + &y); // String + String

3
tests/math.rs
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@ -15,6 +15,8 @@ fn test_math() -> Result<(), EvalAltResult> {
);
// Overflow/underflow/division-by-zero errors
#[cfg(not(feature = "unchecked"))]
{
match engine.eval::<i64>("9223372036854775807 + 1") {
Err(EvalAltResult::ErrorArithmetic(_, _)) => (),
r => panic!("should return overflow error: {:?}", r),
@ -35,6 +37,7 @@ fn test_math() -> Result<(), EvalAltResult> {
Err(EvalAltResult::ErrorArithmetic(_, _)) => (),
r => panic!("should return division by zero error: {:?}", r),
}
}
Ok(())
}