Struct ProgramState

pub struct ProgramState<'a> {
    pub bytecode: [&'a [u8]; 3],
    pub initial: Program,
    pub current: Program,
    pub decoder: Decoder<'a>,
    pub call_stack: CallStack,
}

State for managing active programs and decoding instructions.

Fields

bytecode: [&'a [u8]; 3]

Bytecode for each of the three program types, indexed by Program.

initial: Program

The initial program when execution begins.

current: Program

The currently active program.

decoder: Decoder<'a>

Instruction decoder for the currently active program.

call_stack: CallStack

Tracks nested function and instruction invocations.

Implementations

impl<'a> ProgramState<'a>

pub fn new( font_code: &'a [u8], cv_code: &'a [u8], glyph_code: &'a [u8], initial_program: Program, ) -> Self

pub fn reset(&mut self, program: Program)

Resets the state for execution of the given program.

pub fn enter( &mut self, definition: Definition, count: u32, ) -> Result<(), HintErrorKind>

Jumps to the code in the given definition and sets it up for execution count times.

pub fn leave(&mut self) -> Result<(), HintErrorKind>

Leaves the code from the definition on the top of the stack.

If the top call record has a loop count greater than 1, restarts execution from the beginning of the definition. Otherwise, resumes execution at the previously active definition.