Struct miden_core::mast::BasicBlockNode

pub struct BasicBlockNode { /* private fields */ }

Block for a linear sequence of operations (i.e., no branching or loops).

Executes its operations in order. Fails if any of the operations fails.

A basic block is composed of operation batches, operation batches are composed of operation groups, operation groups encode the VM’s operations and immediate values. These values are created according to these rules:

• A basic block contains one or more batches.
• A batch contains exactly 8 groups.
• A group contains exactly 9 operations or 1 immediate value.
• NOOPs are used to fill a group or batch when necessary.
• An immediate value follows the operation that requires it, using the next available group in the batch. If there are no batches available in the group, then both the operation and its immediate are moved to the next batch.

Example: 8 pushes result in two operation batches:

• First batch: First group with 7 push opcodes and 2 zero-paddings packed together, followed by 7 groups with their respective immediate values.
• Second batch: First group with the last push opcode and 8 zero-paddings packed together, followed by one immediate and 6 padding groups.

The hash of a basic block is:

hash(batches, domain=BASIC_BLOCK_DOMAIN)

Where batches is the concatenation of each batch in the basic block, and each batch is 8 field elements (512 bits).

Implementations

impl BasicBlockNode

Constants

pub const DOMAIN: Felt = ZERO

The domain of the basic block node (used for control block hashing).

impl BasicBlockNode

Constructors

pub fn new(operations: Vec<Operation>) -> Self

Returns a new BasicBlockNode instantiated with the specified operations.

Errors (TODO)

Returns an error if:

• operations vector is empty.
• operations vector contains any number of system operations.

pub fn with_decorators( operations: Vec<Operation>, decorators: DecoratorList, ) -> Self

Returns a new BasicBlockNode instantiated with the specified operations and decorators.

Errors (TODO)

Returns an error if:

• operations vector is empty.
• operations vector contains any number of system operations.

impl BasicBlockNode

Public accessors

pub fn digest(&self) -> RpoDigest

Returns a commitment to this basic block.

pub fn op_batches(&self) -> &[OpBatch]

Returns a reference to the operation batches in this basic block.

pub fn num_op_groups(&self) -> usize

Returns the total number of operation groups in this basic block.

Then number of operation groups is computed as follows:

• For all batches but the last one we set the number of groups to 8, regardless of the actual number of groups in the batch. The reason for this is that when operation batches are concatenated together each batch contributes 8 elements to the hash.
• For the last batch, we take the number of actual groups and round it up to the next power of two. The reason for rounding is that the VM always executes a number of operation groups which is a power of two.

pub fn decorators(&self) -> &DecoratorList

Returns a list of decorators in this basic block node.

Each decorator is accompanied by the operation index specifying the operation prior to which the decorator should be executed.

pub fn decorator_iter(&self) -> DecoratorIterator<'_>

Returns a DecoratorIterator which allows us to iterate through the decorator list of this basic block node while executing operation batches of this basic block node.

pub fn num_operations_and_decorators(&self) -> u32

Returns the total number of operations and decorators in this basic block.

pub fn iter(&self) -> impl Iterator<Item = OperationOrDecorator<'_>>

Returns an iterator over all operations and decorator, in the order in which they appear in the program.

Trait Implementations

impl Clone for BasicBlockNode

fn clone(&self) -> BasicBlockNode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BasicBlockNode

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

Formats the value using the given formatter.

impl Display for BasicBlockNode

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

Formats the value using the given formatter.

impl PartialEq for BasicBlockNode

fn eq(&self, other: &BasicBlockNode) -> 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 PrettyPrint for BasicBlockNode

fn render(&self) -> Document

The core of the PrettyPrint functionality.

fn to_pretty_string(&self) -> String

Produce a String containing the results of pretty-printing this object.

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

Pretty-print this object to the given core::fmt::Formatter.

impl Eq for BasicBlockNode

impl StructuralPartialEq for BasicBlockNode