Struct RegisterAllocator 

pub struct RegisterAllocator { /* private fields */ }

Sequential register allocator for the VDBE register file.

Registers are numbered starting at 1 (register 0 is reserved/unused), matching C SQLite convention.

Implementations

impl RegisterAllocator

pub fn new() -> Self

Create a new allocator. First allocation returns register 1.

pub fn alloc_reg(&mut self) -> i32

Allocate a single persistent register.

pub fn alloc_regs(&mut self, n: i32) -> i32

Allocate a contiguous block of n persistent registers.

Returns the first register number. The block spans [result, result+n).

pub fn alloc_temp(&mut self) -> i32

Allocate a temporary register (reuses from pool if available).

pub fn free_temp(&mut self, reg: i32)

Return a temporary register to the reuse pool.

pub fn count(&self) -> i32

The total number of registers allocated (high water mark).

Trait Implementations

impl Debug for RegisterAllocator

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

Formats the value using the given formatter.

impl Default for RegisterAllocator

fn default() -> Self

Returns the “default value” for a type.