Struct winter_air::TraceLayout

pub struct TraceLayout { /* private fields */ }

Layout of columns within an execution trace.

A layout describes how columns of a trace are arranged into segments. All execution traces must have a non-zero main segment, and may have additional auxiliary trace segments. Currently, the number of auxiliary trace segments is limited to one.

Additionally, a layout contains information on how many random elements are required to build a given auxiliary trace segment. This information is used to construct AuxTraceRandElements struct which is passed in as one of the parameters to Air::evaluate_aux_transition() and Air::get_aux_assertions() methods.

The number of random elements may be different from the number of columns in a given auxiliary segment. For example, an auxiliary segment may contain just one column, but may require many random elements.

Implementations

impl TraceLayout

pub fn new( main_width: usize, aux_widths: [usize; 1], aux_rands: [usize; 1] ) -> Self

Returns a new TraceLayout instantiated with the provided info.

Panics

Panics if:

• Width of the main trace segment is set to zero.
• Sum of all segment widths exceeds 255.
• A zero entry in auxiliary segment width array is followed by a non-zero entry.
• Number of random elements for an auxiliary trace segment of non-zero width is set to zero.
• Number of random elements for an auxiliary trace segment of zero width is set to non-zero.
• Number of random elements for any auxiliary trace segment is greater than 255.

pub fn main_trace_width(&self) -> usize

Returns the number of columns in the main segment of an execution trace.

This is guaranteed to be between 1 and 255.

pub fn aux_trace_width(&self) -> usize

Returns the number of columns in all auxiliary segments of an execution trace.

pub fn num_segments(&self) -> usize

Returns the total number of segments in an execution trace.

pub fn num_aux_segments(&self) -> usize

Returns the number of auxiliary trace segments in an execution trace.

pub fn get_aux_segment_width(&self, segment_idx: usize) -> usize

Returns the number of columns in the auxiliary trace segment at the specified index.

pub fn get_aux_segment_rand_elements(&self, segment_idx: usize) -> usize

Returns the number of random elements required by the auxiliary trace segment at the specified index.

Trait Implementations

impl Clone for TraceLayout

fn clone(&self) -> TraceLayout

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TraceLayout

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

Formats the value using the given formatter.

impl Deserializable for TraceLayout

fn read_from<R: ByteReader>( source: &mut R ) -> Result<Self, DeserializationError>

Reads TraceLayout from the specified source and returns the result.

Errors

Returns an error of a valid TraceLayout struct could not be read from the specified source.

fn read_from_bytes(bytes: &[u8]) -> Result<Self, DeserializationError>

Attempts to deserialize the provided bytes into Self and returns the result.

impl PartialEq for TraceLayout

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl Serializable for TraceLayout

fn write_into<W: ByteWriter>(&self, target: &mut W)

Serializes self and writes the resulting bytes into the target.

fn to_bytes(&self) -> Vec<u8>

Serializes self into a vector of bytes.

fn get_size_hint(&self) -> usize

Returns an estimate of how many bytes are needed to represent self.

impl<E: StarkField> ToElements<E> for TraceLayout

fn to_elements(&self) -> Vec<E>

impl Eq for TraceLayout

impl StructuralPartialEq for TraceLayout