2018-01-17 15:32:33 +00:00
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use std::{i32, i64, u32, u64, f32};
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use std::io;
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use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
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2018-02-06 11:14:57 +00:00
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use TrapKind;
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2018-01-17 15:32:33 +00:00
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2018-02-06 11:14:57 +00:00
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#[derive(Debug)]
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pub enum Error {
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InvalidLittleEndianBuffer,
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}
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2018-01-17 15:32:33 +00:00
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2018-02-06 20:10:58 +00:00
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/// Runtime representation of a value.
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///
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/// Wasm code manipulate values of the four basic value types:
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/// integers and floating-point (IEEE 754-2008) data of 32 or 64 bit width each, respectively.
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///
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/// There is no distinction between signed and unsigned integer types. Instead, integers are
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/// interpreted by respective operations as either unsigned or signed in two’s complement representation.
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2018-01-17 15:32:33 +00:00
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#[derive(Copy, Clone, Debug, PartialEq)]
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pub enum RuntimeValue {
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2018-02-06 20:10:58 +00:00
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/// Value of 32-bit signed or unsigned integer.
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2018-01-17 15:32:33 +00:00
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I32(i32),
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2018-02-06 20:10:58 +00:00
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/// Value of 64-bit signed or unsigned integer.
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2018-01-17 15:32:33 +00:00
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I64(i64),
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2018-02-06 20:10:58 +00:00
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/// Value of 32-bit IEEE 754-2008 floating point number.
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2018-01-17 15:32:33 +00:00
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F32(f32),
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2018-02-06 20:10:58 +00:00
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/// Value of 64-bit IEEE 754-2008 floating point number.
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2018-01-17 15:32:33 +00:00
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F64(f64),
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}
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2018-03-13 22:23:12 +00:00
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/// Trait for creating value from a [`RuntimeValue`].
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///
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/// Typically each implementation can create a value from the specific type.
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/// For example, values of type `bool` or `u32` are both represented by [`I32`] and `f64` values are represented by
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/// [`F64`].
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///
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/// [`I32`]: enum.RuntimeValue.html#variant.I32
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/// [`F64`]: enum.RuntimeValue.html#variant.F64
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/// [`RuntimeValue`]: enum.RuntimeValue.html
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pub trait FromRuntimeValue where Self: Sized {
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/// Create a value of type `Self` from a given [`RuntimeValue`].
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///
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/// Returns `None` if the [`RuntimeValue`] is of type different than
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/// expected by the conversion in question.
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///
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/// [`RuntimeValue`]: enum.RuntimeValue.html
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fn from_runtime_value(val: RuntimeValue) -> Option<Self>;
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2018-01-17 15:32:33 +00:00
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}
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/// Convert one type to another by wrapping.
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pub trait WrapInto<T> {
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/// Convert one type to another by wrapping.
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fn wrap_into(self) -> T;
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}
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/// Convert one type to another by rounding to the nearest integer towards zero.
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pub trait TryTruncateInto<T, E> {
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/// Convert one type to another by rounding to the nearest integer towards zero.
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fn try_truncate_into(self) -> Result<T, E>;
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}
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/// Convert one type to another by extending with leading zeroes.
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pub trait ExtendInto<T> {
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/// Convert one type to another by extending with leading zeroes.
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fn extend_into(self) -> T;
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}
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/// Reinterprets the bits of a value of one type as another type.
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pub trait TransmuteInto<T> {
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/// Reinterprets the bits of a value of one type as another type.
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fn transmute_into(self) -> T;
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}
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/// Convert from and to little endian.
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pub trait LittleEndianConvert where Self: Sized {
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/// Convert to little endian buffer.
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fn into_little_endian(self) -> Vec<u8>;
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/// Convert from little endian buffer.
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2018-02-01 11:59:21 +00:00
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fn from_little_endian(buffer: &[u8]) -> Result<Self, Error>;
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2018-01-17 15:32:33 +00:00
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}
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/// Arithmetic operations.
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pub trait ArithmeticOps<T> {
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/// Add two values.
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fn add(self, other: T) -> T;
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/// Subtract two values.
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fn sub(self, other: T) -> T;
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/// Multiply two values.
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fn mul(self, other: T) -> T;
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/// Divide two values.
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2018-02-06 11:14:57 +00:00
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fn div(self, other: T) -> Result<T, TrapKind>;
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2018-01-17 15:32:33 +00:00
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}
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/// Integer value.
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pub trait Integer<T>: ArithmeticOps<T> {
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/// Counts leading zeros in the bitwise representation of the value.
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fn leading_zeros(self) -> T;
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/// Counts trailing zeros in the bitwise representation of the value.
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fn trailing_zeros(self) -> T;
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/// Counts 1-bits in the bitwise representation of the value.
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fn count_ones(self) -> T;
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/// Get left bit rotation result.
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fn rotl(self, other: T) -> T;
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/// Get right bit rotation result.
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fn rotr(self, other: T) -> T;
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/// Get division remainder.
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2018-02-06 11:14:57 +00:00
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fn rem(self, other: T) -> Result<T, TrapKind>;
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2018-01-17 15:32:33 +00:00
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}
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/// Float-point value.
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pub trait Float<T>: ArithmeticOps<T> {
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/// Get absolute value.
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fn abs(self) -> T;
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/// Returns the largest integer less than or equal to a number.
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fn floor(self) -> T;
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/// Returns the smallest integer greater than or equal to a number.
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fn ceil(self) -> T;
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/// Returns the integer part of a number.
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fn trunc(self) -> T;
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/// Returns the nearest integer to a number. Round half-way cases away from 0.0.
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fn round(self) -> T;
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/// Returns the nearest integer to a number. Ties are round to even number.
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fn nearest(self) -> T;
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/// Takes the square root of a number.
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fn sqrt(self) -> T;
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/// Returns the minimum of the two numbers.
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fn min(self, other: T) -> T;
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/// Returns the maximum of the two numbers.
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fn max(self, other: T) -> T;
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/// Sets sign of this value to the sign of other value.
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fn copysign(self, other: T) -> T;
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}
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impl RuntimeValue {
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/// Creates new default value of given type.
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2018-02-14 10:36:17 +00:00
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pub fn default(value_type: ::types::ValueType) -> Self {
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2018-01-17 15:32:33 +00:00
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match value_type {
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2018-02-14 10:36:17 +00:00
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::types::ValueType::I32 => RuntimeValue::I32(0),
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::types::ValueType::I64 => RuntimeValue::I64(0),
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::types::ValueType::F32 => RuntimeValue::F32(0f32),
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::types::ValueType::F64 => RuntimeValue::F64(0f64),
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2018-01-17 15:32:33 +00:00
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}
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}
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/// Creates new value by interpreting passed u32 as f32.
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pub fn decode_f32(val: u32) -> Self {
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2018-03-12 11:37:43 +00:00
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RuntimeValue::F32(f32::from_bits(val))
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2018-01-17 15:32:33 +00:00
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}
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/// Creates new value by interpreting passed u64 as f64.
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pub fn decode_f64(val: u64) -> Self {
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2018-03-12 11:37:43 +00:00
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RuntimeValue::F64(f64::from_bits(val))
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2018-01-17 15:32:33 +00:00
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}
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/// Get variable type for this value.
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2018-01-18 13:39:14 +00:00
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pub fn value_type(&self) -> ::types::ValueType {
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2018-01-17 15:32:33 +00:00
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match *self {
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2018-01-18 13:39:14 +00:00
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RuntimeValue::I32(_) => ::types::ValueType::I32,
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RuntimeValue::I64(_) => ::types::ValueType::I64,
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RuntimeValue::F32(_) => ::types::ValueType::F32,
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RuntimeValue::F64(_) => ::types::ValueType::F64,
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2018-01-17 15:32:33 +00:00
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}
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}
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2018-03-13 22:23:12 +00:00
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/// Returns `T` if this particular [`RuntimeValue`] contains
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/// appropriate type.
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///
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/// See [`FromRuntimeValue`] for details.
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///
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/// [`FromRuntimeValue`]: trait.FromRuntimeValue.html
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/// [`RuntimeValue`]: enum.RuntimeValue.html
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pub fn try_into<T: FromRuntimeValue>(self) -> Option<T> {
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FromRuntimeValue::from_runtime_value(self)
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}
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2018-01-17 15:32:33 +00:00
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}
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impl From<i32> for RuntimeValue {
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fn from(val: i32) -> Self {
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RuntimeValue::I32(val)
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}
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}
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impl From<i64> for RuntimeValue {
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fn from(val: i64) -> Self {
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RuntimeValue::I64(val)
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}
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}
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impl From<u32> for RuntimeValue {
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fn from(val: u32) -> Self {
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RuntimeValue::I32(val as i32)
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}
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}
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impl From<u64> for RuntimeValue {
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fn from(val: u64) -> Self {
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RuntimeValue::I64(val as i64)
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}
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}
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impl From<f32> for RuntimeValue {
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fn from(val: f32) -> Self {
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RuntimeValue::F32(val)
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}
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}
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impl From<f64> for RuntimeValue {
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fn from(val: f64) -> Self {
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RuntimeValue::F64(val)
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}
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}
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2018-03-13 22:23:12 +00:00
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macro_rules! impl_from_runtime_value {
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($expected_rt_ty: ident, $into: ty) => {
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impl FromRuntimeValue for $into {
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fn from_runtime_value(val: RuntimeValue) -> Option<Self> {
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match val {
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RuntimeValue::$expected_rt_ty(val) => Some(val as $into),
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_ => None,
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}
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}
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2018-01-17 15:32:33 +00:00
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}
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2018-03-13 22:23:12 +00:00
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};
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2018-01-17 15:32:33 +00:00
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}
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2018-03-13 22:23:12 +00:00
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/// This conversion assumes that boolean values are represented by
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/// [`I32`] type.
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///
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/// [`I32`]: enum.RuntimeValue.html#variant.I32
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impl FromRuntimeValue for bool {
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fn from_runtime_value(val: RuntimeValue) -> Option<Self> {
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match val {
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RuntimeValue::I32(val) => Some(val != 0),
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_ => None,
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2018-01-17 15:32:33 +00:00
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}
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}
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}
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2018-03-13 22:23:12 +00:00
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impl_from_runtime_value!(I32, i32);
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impl_from_runtime_value!(I64, i64);
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impl_from_runtime_value!(F32, f32);
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impl_from_runtime_value!(F64, f64);
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impl_from_runtime_value!(I32, u32);
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impl_from_runtime_value!(I64, u64);
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2018-01-17 15:32:33 +00:00
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macro_rules! impl_wrap_into {
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($from: ident, $into: ident) => {
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impl WrapInto<$into> for $from {
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fn wrap_into(self) -> $into {
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self as $into
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}
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}
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}
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}
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impl_wrap_into!(i32, i8);
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impl_wrap_into!(i32, i16);
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impl_wrap_into!(i64, i8);
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impl_wrap_into!(i64, i16);
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impl_wrap_into!(i64, i32);
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impl_wrap_into!(i64, f32);
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impl_wrap_into!(u64, f32);
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// Casting from an f64 to an f32 will produce the closest possible value (rounding strategy unspecified)
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// NOTE: currently this will cause Undefined Behavior if the value is finite but larger or smaller than the
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// largest or smallest finite value representable by f32. This is a bug and will be fixed.
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impl_wrap_into!(f64, f32);
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macro_rules! impl_try_truncate_into {
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($from: ident, $into: ident) => {
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2018-02-06 11:14:57 +00:00
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impl TryTruncateInto<$into, TrapKind> for $from {
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fn try_truncate_into(self) -> Result<$into, TrapKind> {
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2018-01-17 15:32:33 +00:00
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// Casting from a float to an integer will round the float towards zero
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// NOTE: currently this will cause Undefined Behavior if the rounded value cannot be represented by the
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// target integer type. This includes Inf and NaN. This is a bug and will be fixed.
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if self.is_nan() || self.is_infinite() {
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2018-02-06 11:14:57 +00:00
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return Err(TrapKind::InvalidConversionToInt);
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2018-01-17 15:32:33 +00:00
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}
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// range check
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let result = self as $into;
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if result as $from != self.trunc() {
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2018-02-06 11:14:57 +00:00
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return Err(TrapKind::InvalidConversionToInt);
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2018-01-17 15:32:33 +00:00
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}
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Ok(self as $into)
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}
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}
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}
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}
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impl_try_truncate_into!(f32, i32);
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impl_try_truncate_into!(f32, i64);
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impl_try_truncate_into!(f64, i32);
|
|
|
|
|
impl_try_truncate_into!(f64, i64);
|
|
|
|
|
impl_try_truncate_into!(f32, u32);
|
|
|
|
|
impl_try_truncate_into!(f32, u64);
|
|
|
|
|
impl_try_truncate_into!(f64, u32);
|
|
|
|
|
impl_try_truncate_into!(f64, u64);
|
|
|
|
|
|
|
|
|
|
macro_rules! impl_extend_into {
|
|
|
|
|
($from: ident, $into: ident) => {
|
|
|
|
|
impl ExtendInto<$into> for $from {
|
|
|
|
|
fn extend_into(self) -> $into {
|
|
|
|
|
self as $into
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl_extend_into!(i8, i32);
|
|
|
|
|
impl_extend_into!(u8, i32);
|
|
|
|
|
impl_extend_into!(i16, i32);
|
|
|
|
|
impl_extend_into!(u16, i32);
|
|
|
|
|
impl_extend_into!(i8, i64);
|
|
|
|
|
impl_extend_into!(u8, i64);
|
|
|
|
|
impl_extend_into!(i16, i64);
|
|
|
|
|
impl_extend_into!(u16, i64);
|
|
|
|
|
impl_extend_into!(i32, i64);
|
|
|
|
|
impl_extend_into!(u32, i64);
|
|
|
|
|
impl_extend_into!(u32, u64);
|
|
|
|
|
impl_extend_into!(i32, f32);
|
|
|
|
|
impl_extend_into!(i32, f64);
|
|
|
|
|
impl_extend_into!(u32, f32);
|
|
|
|
|
impl_extend_into!(u32, f64);
|
|
|
|
|
impl_extend_into!(i64, f64);
|
|
|
|
|
impl_extend_into!(u64, f64);
|
|
|
|
|
impl_extend_into!(f32, f64);
|
|
|
|
|
|
|
|
|
|
macro_rules! impl_transmute_into_self {
|
|
|
|
|
($type: ident) => {
|
|
|
|
|
impl TransmuteInto<$type> for $type {
|
|
|
|
|
fn transmute_into(self) -> $type {
|
|
|
|
|
self
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl_transmute_into_self!(i32);
|
|
|
|
|
impl_transmute_into_self!(i64);
|
|
|
|
|
impl_transmute_into_self!(f32);
|
|
|
|
|
impl_transmute_into_self!(f64);
|
|
|
|
|
|
|
|
|
|
macro_rules! impl_transmute_into_as {
|
|
|
|
|
($from: ident, $into: ident) => {
|
|
|
|
|
impl TransmuteInto<$into> for $from {
|
|
|
|
|
fn transmute_into(self) -> $into {
|
|
|
|
|
self as $into
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl_transmute_into_as!(i8, u8);
|
|
|
|
|
impl_transmute_into_as!(u8, i8);
|
|
|
|
|
impl_transmute_into_as!(i32, u32);
|
|
|
|
|
impl_transmute_into_as!(u32, i32);
|
|
|
|
|
impl_transmute_into_as!(i64, u64);
|
|
|
|
|
impl_transmute_into_as!(u64, i64);
|
|
|
|
|
|
|
|
|
|
impl TransmuteInto<i32> for f32 {
|
2018-03-12 11:37:43 +00:00
|
|
|
|
fn transmute_into(self) -> i32 { self.to_bits() as i32 }
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl TransmuteInto<i64> for f64 {
|
2018-03-12 11:37:43 +00:00
|
|
|
|
fn transmute_into(self) -> i64 { self.to_bits() as i64 }
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl TransmuteInto<f32> for i32 {
|
2018-03-12 11:37:43 +00:00
|
|
|
|
fn transmute_into(self) -> f32 { f32::from_bits(self as u32) }
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl TransmuteInto<f64> for i64 {
|
2018-03-12 11:37:43 +00:00
|
|
|
|
fn transmute_into(self) -> f64 { f64::from_bits(self as u64) }
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl LittleEndianConvert for i8 {
|
|
|
|
|
fn into_little_endian(self) -> Vec<u8> {
|
|
|
|
|
vec![self as u8]
|
|
|
|
|
}
|
|
|
|
|
|
2018-02-01 11:59:21 +00:00
|
|
|
|
fn from_little_endian(buffer: &[u8]) -> Result<Self, Error> {
|
2018-01-17 15:32:33 +00:00
|
|
|
|
buffer.get(0)
|
|
|
|
|
.map(|v| *v as i8)
|
2018-02-06 11:14:57 +00:00
|
|
|
|
.ok_or_else(|| Error::InvalidLittleEndianBuffer)
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl LittleEndianConvert for u8 {
|
|
|
|
|
fn into_little_endian(self) -> Vec<u8> {
|
|
|
|
|
vec![self]
|
|
|
|
|
}
|
|
|
|
|
|
2018-02-01 11:59:21 +00:00
|
|
|
|
fn from_little_endian(buffer: &[u8]) -> Result<Self, Error> {
|
2018-01-17 15:32:33 +00:00
|
|
|
|
buffer.get(0)
|
|
|
|
|
.cloned()
|
2018-02-06 11:14:57 +00:00
|
|
|
|
.ok_or_else(|| Error::InvalidLittleEndianBuffer)
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl LittleEndianConvert for i16 {
|
|
|
|
|
fn into_little_endian(self) -> Vec<u8> {
|
|
|
|
|
let mut vec = Vec::with_capacity(2);
|
|
|
|
|
vec.write_i16::<LittleEndian>(self)
|
|
|
|
|
.expect("i16 is written without any errors");
|
|
|
|
|
vec
|
|
|
|
|
}
|
|
|
|
|
|
2018-02-01 11:59:21 +00:00
|
|
|
|
fn from_little_endian(buffer: &[u8]) -> Result<Self, Error> {
|
2018-01-17 15:32:33 +00:00
|
|
|
|
io::Cursor::new(buffer).read_i16::<LittleEndian>()
|
2018-02-06 11:14:57 +00:00
|
|
|
|
.map_err(|_| Error::InvalidLittleEndianBuffer)
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl LittleEndianConvert for u16 {
|
|
|
|
|
fn into_little_endian(self) -> Vec<u8> {
|
|
|
|
|
let mut vec = Vec::with_capacity(2);
|
|
|
|
|
vec.write_u16::<LittleEndian>(self)
|
|
|
|
|
.expect("u16 is written without any errors");
|
|
|
|
|
vec
|
|
|
|
|
}
|
|
|
|
|
|
2018-02-01 11:59:21 +00:00
|
|
|
|
fn from_little_endian(buffer: &[u8]) -> Result<Self, Error> {
|
2018-01-17 15:32:33 +00:00
|
|
|
|
io::Cursor::new(buffer).read_u16::<LittleEndian>()
|
2018-02-06 11:14:57 +00:00
|
|
|
|
.map_err(|_| Error::InvalidLittleEndianBuffer)
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl LittleEndianConvert for i32 {
|
|
|
|
|
fn into_little_endian(self) -> Vec<u8> {
|
|
|
|
|
let mut vec = Vec::with_capacity(4);
|
|
|
|
|
vec.write_i32::<LittleEndian>(self)
|
|
|
|
|
.expect("i32 is written without any errors");
|
|
|
|
|
vec
|
|
|
|
|
}
|
|
|
|
|
|
2018-02-01 11:59:21 +00:00
|
|
|
|
fn from_little_endian(buffer: &[u8]) -> Result<Self, Error> {
|
2018-01-17 15:32:33 +00:00
|
|
|
|
io::Cursor::new(buffer).read_i32::<LittleEndian>()
|
2018-02-06 11:14:57 +00:00
|
|
|
|
.map_err(|_| Error::InvalidLittleEndianBuffer)
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl LittleEndianConvert for u32 {
|
|
|
|
|
fn into_little_endian(self) -> Vec<u8> {
|
|
|
|
|
let mut vec = Vec::with_capacity(4);
|
|
|
|
|
vec.write_u32::<LittleEndian>(self)
|
|
|
|
|
.expect("u32 is written without any errors");
|
|
|
|
|
vec
|
|
|
|
|
}
|
|
|
|
|
|
2018-02-01 11:59:21 +00:00
|
|
|
|
fn from_little_endian(buffer: &[u8]) -> Result<Self, Error> {
|
2018-01-17 15:32:33 +00:00
|
|
|
|
io::Cursor::new(buffer).read_u32::<LittleEndian>()
|
2018-02-06 11:14:57 +00:00
|
|
|
|
.map_err(|_| Error::InvalidLittleEndianBuffer)
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl LittleEndianConvert for i64 {
|
|
|
|
|
fn into_little_endian(self) -> Vec<u8> {
|
|
|
|
|
let mut vec = Vec::with_capacity(8);
|
|
|
|
|
vec.write_i64::<LittleEndian>(self)
|
|
|
|
|
.expect("i64 is written without any errors");
|
|
|
|
|
vec
|
|
|
|
|
}
|
|
|
|
|
|
2018-02-01 11:59:21 +00:00
|
|
|
|
fn from_little_endian(buffer: &[u8]) -> Result<Self, Error> {
|
2018-01-17 15:32:33 +00:00
|
|
|
|
io::Cursor::new(buffer).read_i64::<LittleEndian>()
|
2018-02-06 11:14:57 +00:00
|
|
|
|
.map_err(|_| Error::InvalidLittleEndianBuffer)
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl LittleEndianConvert for f32 {
|
|
|
|
|
fn into_little_endian(self) -> Vec<u8> {
|
|
|
|
|
let mut vec = Vec::with_capacity(4);
|
|
|
|
|
vec.write_f32::<LittleEndian>(self)
|
|
|
|
|
.expect("f32 is written without any errors");
|
|
|
|
|
vec
|
|
|
|
|
}
|
|
|
|
|
|
2018-02-01 11:59:21 +00:00
|
|
|
|
fn from_little_endian(buffer: &[u8]) -> Result<Self, Error> {
|
2018-01-17 15:32:33 +00:00
|
|
|
|
io::Cursor::new(buffer).read_u32::<LittleEndian>()
|
2018-03-12 11:37:43 +00:00
|
|
|
|
.map(f32::from_bits)
|
2018-02-06 11:14:57 +00:00
|
|
|
|
.map_err(|_| Error::InvalidLittleEndianBuffer)
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl LittleEndianConvert for f64 {
|
|
|
|
|
fn into_little_endian(self) -> Vec<u8> {
|
|
|
|
|
let mut vec = Vec::with_capacity(8);
|
|
|
|
|
vec.write_f64::<LittleEndian>(self)
|
|
|
|
|
.expect("i64 is written without any errors");
|
|
|
|
|
vec
|
|
|
|
|
}
|
|
|
|
|
|
2018-02-01 11:59:21 +00:00
|
|
|
|
fn from_little_endian(buffer: &[u8]) -> Result<Self, Error> {
|
2018-01-17 15:32:33 +00:00
|
|
|
|
io::Cursor::new(buffer).read_u64::<LittleEndian>()
|
2018-03-12 11:37:43 +00:00
|
|
|
|
.map(f64::from_bits)
|
2018-02-06 11:14:57 +00:00
|
|
|
|
.map_err(|_| Error::InvalidLittleEndianBuffer)
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
macro_rules! impl_integer_arithmetic_ops {
|
|
|
|
|
($type: ident) => {
|
|
|
|
|
impl ArithmeticOps<$type> for $type {
|
|
|
|
|
fn add(self, other: $type) -> $type { self.wrapping_add(other) }
|
|
|
|
|
fn sub(self, other: $type) -> $type { self.wrapping_sub(other) }
|
|
|
|
|
fn mul(self, other: $type) -> $type { self.wrapping_mul(other) }
|
2018-02-06 11:14:57 +00:00
|
|
|
|
fn div(self, other: $type) -> Result<$type, TrapKind> {
|
2018-02-01 11:59:21 +00:00
|
|
|
|
if other == 0 {
|
2018-02-06 11:14:57 +00:00
|
|
|
|
Err(TrapKind::DivisionByZero)
|
2018-02-01 11:59:21 +00:00
|
|
|
|
}
|
2018-01-17 15:32:33 +00:00
|
|
|
|
else {
|
|
|
|
|
let (result, overflow) = self.overflowing_div(other);
|
|
|
|
|
if overflow {
|
2018-02-06 11:14:57 +00:00
|
|
|
|
Err(TrapKind::InvalidConversionToInt)
|
2018-01-17 15:32:33 +00:00
|
|
|
|
} else {
|
|
|
|
|
Ok(result)
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl_integer_arithmetic_ops!(i32);
|
|
|
|
|
impl_integer_arithmetic_ops!(u32);
|
|
|
|
|
impl_integer_arithmetic_ops!(i64);
|
|
|
|
|
impl_integer_arithmetic_ops!(u64);
|
|
|
|
|
|
|
|
|
|
macro_rules! impl_float_arithmetic_ops {
|
|
|
|
|
($type: ident) => {
|
|
|
|
|
impl ArithmeticOps<$type> for $type {
|
|
|
|
|
fn add(self, other: $type) -> $type { self + other }
|
|
|
|
|
fn sub(self, other: $type) -> $type { self - other }
|
|
|
|
|
fn mul(self, other: $type) -> $type { self * other }
|
2018-02-06 11:14:57 +00:00
|
|
|
|
fn div(self, other: $type) -> Result<$type, TrapKind> { Ok(self / other) }
|
2018-01-17 15:32:33 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl_float_arithmetic_ops!(f32);
|
|
|
|
|
impl_float_arithmetic_ops!(f64);
|
|
|
|
|
|
|
|
|
|
macro_rules! impl_integer {
|
|
|
|
|
($type: ident) => {
|
|
|
|
|
impl Integer<$type> for $type {
|
|
|
|
|
fn leading_zeros(self) -> $type { self.leading_zeros() as $type }
|
|
|
|
|
fn trailing_zeros(self) -> $type { self.trailing_zeros() as $type }
|
|
|
|
|
fn count_ones(self) -> $type { self.count_ones() as $type }
|
|
|
|
|
fn rotl(self, other: $type) -> $type { self.rotate_left(other as u32) }
|
|
|
|
|
fn rotr(self, other: $type) -> $type { self.rotate_right(other as u32) }
|
2018-02-06 11:14:57 +00:00
|
|
|
|
fn rem(self, other: $type) -> Result<$type, TrapKind> {
|
|
|
|
|
if other == 0 { Err(TrapKind::DivisionByZero) }
|
2018-01-17 15:32:33 +00:00
|
|
|
|
else { Ok(self.wrapping_rem(other)) }
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl_integer!(i32);
|
|
|
|
|
impl_integer!(u32);
|
|
|
|
|
impl_integer!(i64);
|
|
|
|
|
impl_integer!(u64);
|
|
|
|
|
|
|
|
|
|
macro_rules! impl_float {
|
|
|
|
|
($type: ident, $int_type: ident) => {
|
|
|
|
|
impl Float<$type> for $type {
|
|
|
|
|
fn abs(self) -> $type { self.abs() }
|
|
|
|
|
fn floor(self) -> $type { self.floor() }
|
|
|
|
|
fn ceil(self) -> $type { self.ceil() }
|
|
|
|
|
fn trunc(self) -> $type { self.trunc() }
|
|
|
|
|
fn round(self) -> $type { self.round() }
|
|
|
|
|
fn nearest(self) -> $type {
|
|
|
|
|
let round = self.round();
|
|
|
|
|
if self.fract().abs() != 0.5 {
|
|
|
|
|
return round;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
use std::ops::Rem;
|
|
|
|
|
if round.rem(2.0) == 1.0 {
|
|
|
|
|
self.floor()
|
|
|
|
|
} else if round.rem(2.0) == -1.0 {
|
|
|
|
|
self.ceil()
|
|
|
|
|
} else {
|
|
|
|
|
round
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
fn sqrt(self) -> $type { self.sqrt() }
|
|
|
|
|
// This instruction corresponds to what is sometimes called "minNaN" in other languages.
|
|
|
|
|
fn min(self, other: $type) -> $type {
|
|
|
|
|
if self.is_nan() || other.is_nan() {
|
|
|
|
|
use std::$type;
|
|
|
|
|
return $type::NAN;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
self.min(other)
|
|
|
|
|
}
|
|
|
|
|
// This instruction corresponds to what is sometimes called "maxNaN" in other languages.
|
|
|
|
|
fn max(self, other: $type) -> $type {
|
|
|
|
|
if self.is_nan() || other.is_nan() {
|
|
|
|
|
use std::$type;
|
|
|
|
|
return $type::NAN;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
self.max(other)
|
|
|
|
|
}
|
|
|
|
|
fn copysign(self, other: $type) -> $type {
|
|
|
|
|
use std::mem::size_of;
|
|
|
|
|
|
|
|
|
|
if self.is_nan() {
|
|
|
|
|
return self;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
let sign_mask: $int_type = 1 << ((size_of::<$int_type>() << 3) - 1);
|
|
|
|
|
let self_int: $int_type = self.transmute_into();
|
|
|
|
|
let other_int: $int_type = other.transmute_into();
|
|
|
|
|
let is_self_sign_set = (self_int & sign_mask) != 0;
|
|
|
|
|
let is_other_sign_set = (other_int & sign_mask) != 0;
|
|
|
|
|
if is_self_sign_set == is_other_sign_set {
|
|
|
|
|
self
|
|
|
|
|
} else if is_other_sign_set {
|
|
|
|
|
(self_int | sign_mask).transmute_into()
|
|
|
|
|
} else {
|
|
|
|
|
(self_int & !sign_mask).transmute_into()
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl_float!(f32, i32);
|
|
|
|
|
impl_float!(f64, i64);
|