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use super::InstanceEntity;
use crate::{
ElementSegment,
Extern,
ExternType,
Func,
Global,
Memory,
Module,
Table,
collections::Map,
engine::DedupFuncType,
memory::DataSegment,
module::FuncIdx,
};
use alloc::{boxed::Box, sync::Arc, vec::Vec};
/// A module instance entity builder.
#[derive(Debug)]
pub struct InstanceEntityBuilder {
func_types: Arc<[DedupFuncType]>,
tables: Vec<Table>,
funcs: Vec<Func>,
memories: Vec<Memory>,
globals: Vec<Global>,
start_fn: Option<FuncIdx>,
exports: Map<Box<str>, Extern>,
data_segments: Vec<DataSegment>,
elem_segments: Vec<ElementSegment>,
}
impl InstanceEntityBuilder {
/// Creates a new [`InstanceEntityBuilder`] optimized for the [`Module`].
pub fn new(module: &Module) -> Self {
fn vec_with_capacity_exact<T>(capacity: usize) -> Vec<T> {
let mut v = Vec::new();
v.reserve_exact(capacity);
v
}
let mut len_funcs = module.len_funcs();
let mut len_globals = module.len_globals();
let mut len_tables = module.len_tables();
let mut len_memories = module.len_memories();
for import in module.imports() {
match import.ty() {
ExternType::Func(_) => {
len_funcs += 1;
}
ExternType::Table(_) => {
len_tables += 1;
}
ExternType::Memory(_) => {
len_memories += 1;
}
ExternType::Global(_) => {
len_globals += 1;
}
}
}
Self {
func_types: module.func_types_cloned(),
tables: vec_with_capacity_exact(len_tables),
funcs: vec_with_capacity_exact(len_funcs),
memories: vec_with_capacity_exact(len_memories),
globals: vec_with_capacity_exact(len_globals),
start_fn: None,
exports: Map::default(),
data_segments: Vec::new(),
elem_segments: Vec::new(),
}
}
/// Sets the start function of the built instance.
///
/// # Panics
///
/// If the start function has already been set.
pub fn set_start(&mut self, start_fn: FuncIdx) {
match &mut self.start_fn {
Some(index) => panic!("already set start function {index:?}"),
None => {
self.start_fn = Some(start_fn);
}
}
}
/// Returns the start function index if any.
pub fn get_start(&self) -> Option<FuncIdx> {
self.start_fn
}
/// Returns the [`Memory`] at the `index`.
///
/// # Panics
///
/// If there is no [`Memory`] at the given `index.
pub fn get_memory(&self, index: u32) -> Memory {
self.memories
.get(index as usize)
.copied()
.unwrap_or_else(|| panic!("missing `Memory` at index: {index}"))
}
/// Returns the [`Table`] at the `index`.
///
/// # Panics
///
/// If there is no [`Table`] at the given `index.
pub fn get_table(&self, index: u32) -> Table {
self.tables
.get(index as usize)
.copied()
.unwrap_or_else(|| panic!("missing `Table` at index: {index}"))
}
/// Returns the [`Global`] at the `index`.
///
/// # Panics
///
/// If there is no [`Global`] at the given `index.
pub fn get_global(&self, index: u32) -> Global {
self.globals
.get(index as usize)
.copied()
.unwrap_or_else(|| panic!("missing `Global` at index: {index}"))
}
/// Returns the function at the `index`.
///
/// # Panics
///
/// If there is no function at the given `index.
pub fn get_func(&self, index: u32) -> Func {
self.funcs
.get(index as usize)
.copied()
.unwrap_or_else(|| panic!("missing `Func` at index: {index}"))
}
/// Pushes a new [`Memory`] to the [`InstanceEntity`] under construction.
pub fn push_memory(&mut self, memory: Memory) {
self.memories.push(memory);
}
/// Pushes a new [`Table`] to the [`InstanceEntity`] under construction.
pub fn push_table(&mut self, table: Table) {
self.tables.push(table);
}
/// Pushes a new [`Global`] to the [`InstanceEntity`] under construction.
pub fn push_global(&mut self, global: Global) {
self.globals.push(global);
}
/// Pushes a new [`Func`] to the [`InstanceEntity`] under construction.
pub fn push_func(&mut self, func: Func) {
self.funcs.push(func);
}
/// Pushes a new [`Extern`] under the given `name` to the [`InstanceEntity`] under construction.
///
/// # Panics
///
/// If the name has already been used by an already pushed [`Extern`].
pub fn push_export(&mut self, name: &str, new_value: Extern) {
if let Some(old_value) = self.exports.get(name) {
panic!(
"tried to register {new_value:?} for name {name} \
but name is already used by {old_value:?}",
)
}
self.exports.insert(name.into(), new_value);
}
/// Pushes the [`DataSegment`] to the [`InstanceEntity`] under construction.
pub fn push_data_segment(&mut self, segment: DataSegment) {
self.data_segments.push(segment);
}
/// Pushes the [`ElementSegment`] to the [`InstanceEntity`] under construction.
pub fn push_element_segment(&mut self, segment: ElementSegment) {
self.elem_segments.push(segment);
}
/// Finishes constructing the [`InstanceEntity`].
pub fn finish(self) -> InstanceEntity {
InstanceEntity {
initialized: true,
func_types: self.func_types,
tables: self.tables.into(),
funcs: self.funcs.into(),
memories: self.memories.into(),
globals: self.globals.into(),
exports: self.exports,
data_segments: self.data_segments.into(),
elem_segments: self.elem_segments.into(),
}
}
}