Struct wasmer_compiler::object::module::ObjectMetadataBuilder

pub struct ObjectMetadataBuilder {
    placeholder_data: Vec<u8>,
    metadata_length: u64,
    section_offset: u64,
    num_function_pointers: u64,
    num_trampolines: u64,
    num_dynamic_function_trampoline_pointers: u64,
    endianness: Endianness,
    pointer_width: PointerWidth,
}

ObjectMetadataBuilder builds serialized module metadata include in an object. In addition, it also relies on information from ModuleInfo to build a table of function pointers, trmampolines and dynamic function trampoline pointers. ObjectMetadataBuilder takes care of setting up relocations, so a linker can automatically fill in actuall addesses of all relavant functions. There is no need to piece the information together in the glue C file.

Fields

placeholder_data: Vec<u8>

metadata_length: u64

section_offset: u64

num_function_pointers: u64

num_trampolines: u64

num_dynamic_function_trampoline_pointers: u64

endianness: Endianness

pointer_width: PointerWidth

Implementations

impl ObjectMetadataBuilder

pub fn new( metadata: &ModuleMetadata, triple: &Triple, ) -> Result<Self, ObjectError>

Creates a new FunctionRelocsBuilder

pub fn set_section_offset(&mut self, offset: u64)

Sets section offset used in relocations

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

Placeholder data for emit_data call

pub fn pointer_bytes(&self) -> u64

Bytes of a pointer for target architecture

pub fn setup_function_pointer( &self, obj: &mut Object<'_>, index: usize, symbol_id: SymbolId, ) -> Result<(), ObjectError>

Sets up relocation for a function pointer

pub fn setup_trampoline( &self, obj: &mut Object<'_>, index: usize, symbol_id: SymbolId, ) -> Result<(), ObjectError>

Sets up relocation for a trampoline

pub fn setup_dynamic_function_trampoline_pointer( &self, obj: &mut Object<'_>, index: usize, symbol_id: SymbolId, ) -> Result<(), ObjectError>

Sets up relocation for a dynamic function trampoline pointer

fn function_pointers_start_offset(&self) -> u64

fn trampolines_start_offset(&self) -> u64

fn dynamic_function_trampoline_pointers_start_offset(&self) -> u64

fn serialize_value(&self, value: u64) -> Vec<u8>