Struct rustdb::expr::Block

pub struct Block<'a> {
    pub param_count: usize,
    pub return_type: DataType,
    pub local_typ: Vec<DataType>,
    pub ilist: Vec<Instruction>,
    pub break_id: usize,
    pub db: DB,
    pub from: Option<CTableExpression>,
    pub parse_only: bool,
    /* private fields */
}

Compilation block ( body of function or batch section ).

Fields

param_count: usize

Number of function parameters.

return_type: DataType

Function return type.

local_typ: Vec<DataType>

Datatypes of paramaters and local variables.

ilist: Vec<Instruction>

List of instructions.

break_id: usize

Id of break.

db: DB

Database.

from: Option<CTableExpression>

Current table in scope by FROM clause( or UPDATE statment ).

parse_only: bool

Only parse, no type checking or compilation.

Implementations

impl<'a> Block<'a>

pub fn new(db: DB) -> Self

Construct a new block.

pub fn resolve_jumps(&mut self)

Check labels are all defined and patch jump instructions.

pub fn add(&mut self, s: Instruction)

Add an instruction to the instruction list.

pub fn dop(&mut self, dop: DO)

Add a Data Operation (DO) to the instruction list.

pub fn check_types(&self, r: &Rc<Function>, pkinds: &[DataKind])

Check the parameter kinds match the function.

pub fn def_local(&mut self, name: &'a [u8], dt: DataType)

Define a local variable ( parameter or declared ).

pub fn get_local(&self, name: &[u8]) -> Option<&usize>

Get the number of a local variable from a name.

pub fn local_name(&self, num: usize) -> &[u8]

Get the name of a local variable from a number.

pub fn get_jump_id(&mut self) -> usize

Get a local jump id.

pub fn set_jump(&mut self, jump_id: usize)

Set instruction location of jump id.

pub fn get_loop_id(&mut self) -> usize

Get a local jump id to current location.

pub fn get_goto_label(&mut self, s: &'a [u8]) -> usize

Get a number for a local goto label.

pub fn set_goto_label(&mut self, s: &'a [u8])

Set the local for a local goto lable.

pub fn kind(&self, e: &mut Expr) -> DataKind

Get the DataKind of an expression.