Struct JitPage 

pub struct JitPage { /* private fields */ }

A page-aligned block of executable memory holding JIT-compiled machine code.

Implementations

impl JitPage

pub fn new(code: &[u8]) -> Result<JitPage, JitError>

Allocate an executable page, copy code into it, and make it runnable.

pub fn patch_word(&self, offset: usize, value: u64) -> Result<(), JitError>

Patch one 8-byte LITERAL-POOL word after sealing (the self-call entry: a chain’s own base address becomes known only after layout). Data-only — the word lives in the pool, never decoded as code — so no instruction-cache concerns; the brief RW window happens on the compiling thread before the chain ever runs.

pub fn with_layout( len: usize, fill: impl FnOnce(u64) -> Vec<u8>, ) -> Result<JitPage, JitError>

Two-phase construction for PATCHED code: maps first (so the final base address is known), lets fill produce the bytes against that base, then writes and seals. fill must return exactly len bytes.

pub unsafe fn as_fn_i64_i64(&self) -> extern "C" fn(i64, i64) -> i64

Reinterpret the page as an extern "C" fn(i64, i64) -> i64.

Safety

The caller must guarantee the page actually contains valid machine code implementing this exact signature, and must not call the pointer after the JitPage is dropped.

pub fn as_ptr(&self) -> *const u8

Raw pointer to the executable code (for patching / inspection).

pub fn len(&self) -> usize

Length of the machine code in bytes (the mapping itself is JitPage::alloc_len bytes).

pub fn alloc_len(&self) -> usize

Bytes actually mapped (page-size multiple).

pub fn is_empty(&self) -> bool

Whether the page is empty (always false; new rejects empty code).

Trait Implementations

impl Debug for JitPage

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

Formats the value using the given formatter.

impl Drop for JitPage

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

impl Send for JitPage

impl Sync for JitPage