Struct JumpTable

pub struct JumpTable {
    pub(crate) jump: BTreeMap<u16, Jump>,
    pub(crate) func: BTreeMap<u32, u16>,
    pub(crate) code: Code,
}

Jump table implementation.

Fields

jump: BTreeMap<u16, Jump>

Jump table.

func: BTreeMap<u32, u16>

Function table.

code: Code

Code section.

Implementations

impl JumpTable

pub fn shift_pc(&mut self, start: u16, offset: u16) -> Result<()>

Shift program counter for all items.

pub fn shift_targets(&mut self) -> Result<()>

Shift the target program counters.

Calculating target pc from the offset of original pc.

pub fn shift_target(&mut self, ptr: u16, offset: u16) -> Result<()>

Shift the program counter of targets with given ptr and offset.

1. shift code section.
2. shift label targets.
3. shift function targets.

pub fn shift_label_pc(&mut self, start: u16, offset: u16) -> Result<()>

Shift program counter for labels.

pub fn shift_func_target(&mut self, ptr: u16, offset: u16) -> Result<()>

Shift program counter for functions.

pub fn shift_label_target(&mut self, ptr: u16, offset: u16) -> Result<()>

Shift target program counter for labels.

impl JumpTable

pub fn relocate(&mut self, buffer: &mut Buffer) -> Result<()>

Relocate program counter to all registered labels.

WARNING: This function should only be called once in the compiler. considering move it to the compiler.

fn relocate_offset(&self, pc: u16, jump: Jump, target: &mut u16) -> Result<()>

relocate the target of offset jump

impl JumpTable

pub fn call(&mut self, pc: u16, func: u32)

Register a function.

pub fn call_offset(&mut self, func: u32, offset: u16) -> Result<()>

Register program counter to the function table.

pub fn code_offset(&mut self, offset: u16)

Register the start of the program counter of the code section.

pub fn ext(&mut self, pc: u16, func: ExtFunc)

Register a external function.

pub fn label(&mut self, pc: u16, label: u16)

Register a label.

pub fn offset(&mut self, pc: u16, offset: u16)

Register a label at the specific PC offset

pub fn merge(&mut self, table: Self, pc: u16) -> Result<()>

Merge two jump tables.

Merge other jump table into this one, update the program counter of the target jump table.

pub fn target(&self, jump: &Jump) -> Result<u16>

Get the target of a jump.

pub fn target_offset(&self, jump: &Jump, offset: u16) -> Result<u16>

Get the target offset

Trait Implementations

impl Clone for JumpTable

fn clone(&self) -> JumpTable

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for JumpTable

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

Formats the value using the given formatter.

impl Default for JumpTable

fn default() -> JumpTable

Returns the “default value” for a type.