Struct solana_program::entrypoint::BumpAllocator

pub struct BumpAllocator {
    pub start: usize,
    pub len: usize,
}

The bump allocator used as the default rust heap when running programs.

Fields

start: usize

len: usize

Trait Implementations

impl GlobalAlloc for BumpAllocator

Integer arithmetic in this global allocator implementation is safe when operating on the prescribed HEAP_START_ADDRESS and HEAP_LENGTH. Any other use may overflow and is thus unsupported and at one’s own risk.

unsafe fn alloc(&self, layout: Layout) -> *mut u8

Allocate memory as described by the given layout.

unsafe fn dealloc(&self, _: *mut u8, _: Layout)

Deallocate the block of memory at the given ptr pointer with the given layout.

unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8

Behaves like alloc, but also ensures that the contents are set to zero before being returned.

unsafe fn realloc(
    &self,
    ptr: *mut u8,
    layout: Layout,
    new_size: usize
) -> *mut u8

Shrink or grow a block of memory to the given new_size. The block is described by the given ptr pointer and layout.