Struct CodeMemory 

pub struct CodeMemory { /* private fields */ }

Management of executable memory within a MmapVec

This type consumes ownership of a region of memory and will manage the executable permissions of the contained JIT code as necessary.

Implementations

impl CodeMemory

pub fn new(engine: &Engine, mmap: MmapVec) -> Result<Self>

Available on crate feature runtime only.

Creates a new CodeMemory by taking ownership of the provided MmapVec.

The returned CodeMemory manages the internal MmapVec and the publish method is used to actually make the memory executable.

pub fn mmap(&self) -> &MmapVec

Available on crate feature runtime only.

Returns a reference to the underlying MmapVec this memory owns.

pub fn text(&self) -> &[u8]

Available on crate feature runtime only.

Returns the contents of the text section of the ELF executable this represents.

pub fn wasm_dwarf(&self) -> &[u8]

Available on crate feature runtime only.

Returns the contents of the ELF_WASMTIME_DWARF section.

pub fn func_name_data(&self) -> &[u8]

Available on crate feature runtime only.

Returns the data in the ELF_NAME_DATA section.

pub fn wasm_data(&self) -> &[u8]

Available on crate feature runtime only.

Returns the concatenated list of all data associated with this wasm module.

This is used for initialization of memories and all data ranges stored in a Module are relative to the slice returned here.

pub fn address_map_data(&self) -> &[u8]

Available on crate feature runtime only.

Returns the encoded address map section used to pass to wasmtime_environ::lookup_file_pos.

pub fn stack_map_data(&self) -> &[u8]

Available on crate feature runtime only.

Returns the encoded stack map section used to pass to wasmtime_environ::StackMap::lookup.

pub fn exception_tables(&self) -> &[u8]

Available on crate feature runtime only.

Returns the encoded exception-tables section to pass to wasmtime_unwinder::ExceptionTable::parse.

pub fn wasmtime_info(&self) -> &[u8]

Available on crate feature runtime only.

Returns the contents of the ELF_WASMTIME_INFO section, or an empty slice if it wasn’t found.

pub fn trap_data(&self) -> &[u8]

Available on crate feature runtime only.

Returns the contents of the ELF_WASMTIME_TRAPS section, or an empty slice if it wasn’t found.

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

Available on crate feature runtime only.

Publishes the internal ELF image to be ready for execution.

This method can only be called once and will panic if called twice. This will parse the ELF image from the original MmapVec and do everything necessary to get it ready for execution, including:

• Change page protections from read/write to read/execute.
• Register unwinding information with the OS
• Register this image with the debugger if native DWARF is present

After this function executes all JIT code should be ready to execute.

pub fn lookup_trap_code(&self, text_offset: usize) -> Option<Trap>

Available on crate feature runtime only.

Looks up the given offset within this module’s text section and returns the trap code associated with that instruction, if there is one.

Trait Implementations

impl Drop for CodeMemory

Available on crate feature runtime only.

fn drop(&mut self)

Executes the destructor for this type.