Enum Pred

pub enum Pred {
    Eq,
    EqRange,
    Gt,
    Lt,
    Gte,
    Lte,
    And,
    Or,
    Not,
    EqSet,
    BitAnd,
    BitOr,
}

Operations for computing predicates.

Variants

Eq

0x10

Check equality of two words.

Stack Input

[lhs, rhs]

Stack Output

[lhs == rhs]

EqRange

0x11: EQRA

Check equality of two ranges on the stack.

The ranges must be of equal length. The ranges must be stacked sequentially. Here N is len -1.

Stack Input

[arr_a_0, ..arr_a_N, arr_b_0, ..arr_b_N, len]

Stack Output

[(top-(2*len))..(top - len) == (top - len)..top]

Gt

0x12

Check if left-hand side is greater than right-hand side.

Stack Input

[lhs, rhs]

Stack Output

[lhs > rhs]

Lt

0x13

Check if left-hand side is less than right-hand side.

Stack Input

[lhs, rhs]

Stack Output

[lhs < rhs]

Gte

0x14

Check if left-hand side is greater than or equal to right-hand side.

Stack Input

[lhs, rhs]

Stack Output

[lhs >= rhs]

Lte

0x15

Check if left-hand side is less than or equal to right-hand side.

Stack Input

[lhs, rhs]

Stack Output

[lhs <= rhs]

And

0x16

Logical AND of two words.

Stack Input

[lhs, rhs]

Stack Output

[lhs && rhs]

Or

0x17

Logical OR of two words.

Stack Input

[lhs, rhs]

Stack Output

[lhs || rhs]

Not

0x18

Logical NOT of a word.

Stack Input

[a]

Stack Output

[!a]

EqSet

0x19: EQST

Pop two sets off the stack and check if they are equal. This is set equality so order does not matter. Sets must be the same length.

Note the encoding of each set is: [elem_0_word_0, ...elem_0_word_I, elem_0_len, ...elem_N_word_0, ...elem_N_word_J, elem_N_len, set_len].

Note this differs from EqRange in that there is a size given at the end of both sets.

Stack Input

[lhs, lhs_set_length, rhs, rhs_set_length]

Stack Output

[set(lhs) == set(rhs)]

BitAnd

0x1A: BAND

Bitwise AND of two words.

Stack Input

[lhs, rhs]

Stack Output

[lhs & rhs]

BitOr

0x1B: BOR

Bitwise OR of two words.

Stack Input

[lhs, rhs]

Stack Output

[lhs | rhs]

Trait Implementations

impl Clone for Pred

fn clone(&self) -> Pred

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Pred

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl From<Pred> for Constraint

fn from(subgroup: Pred) -> Constraint

Converts to this type from the input type.

impl From<Pred> for StateRead

fn from(subgroup: Pred) -> StateRead

Converts to this type from the input type.

impl Hash for Pred

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Pred

fn cmp(&self, other: &Pred) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Pred

fn eq(&self, other: &Pred) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Pred

fn partial_cmp(&self, other: &Pred) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl ToBytes for Pred

type Bytes = Pred

The iterator yielding bytes.

fn to_bytes(&self) -> <Pred as ToBytes>::Bytes

Convert the operation to its serialized form in bytes.

impl ToOpcode for Pred

type Opcode = Pred

The associated Opcode type.

fn to_opcode(&self) -> <Pred as ToOpcode>::Opcode

The opcode associated with this operation.

impl TryFromBytes for Pred

type Error = FromBytesError

Represents any error that might occur while parsing an op from bytes.

fn try_from_bytes( bytes: &mut impl Iterator<Item = u8>, ) -> Option<Result<Pred, <Pred as TryFromBytes>::Error>>

Parse a single operation from the given iterator yielding bytes.

impl Copy for Pred

impl Eq for Pred

impl StructuralPartialEq for Pred