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parse.rs
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parse.rs
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use crate::map::IdHashMap;
use crate::{DataId, ElementId, Function, FunctionId, GlobalId, Result};
use crate::{LocalId, MemoryId, TableId, TypeId};
use anyhow::bail;
/// Maps from old indices in the original Wasm binary to `walrus` IDs.
///
/// This is intended to be used with `walrus::Module`s that were parsed from
/// some existing Wasm binary. `walrus::Module`s that are built up from scratch,
/// and not originally parsed from an existing Wasm binary, will have an empty
/// `IndicesToIds`.
///
/// For example, this allows you to get the `walrus::FunctionId` of some Wasm
/// function when you have its old index in the original Wasm module.
///
/// Any newly built or added things (functions, tables, types, etc) are not
/// associated with an old index (since they were not present in the original
/// Wasm binary).
#[derive(Debug, Default)]
pub struct IndicesToIds {
tables: Vec<TableId>,
types: Vec<TypeId>,
funcs: Vec<FunctionId>,
globals: Vec<GlobalId>,
memories: Vec<MemoryId>,
elements: Vec<ElementId>,
data: Vec<DataId>,
locals: IdHashMap<Function, Vec<LocalId>>,
}
macro_rules! define_push_get {
( $push:ident, $get:ident, $id_ty:ty, $member:ident ) => {
impl IndicesToIds {
/// Pushes a new local ID to map it to the next index internally
pub(crate) fn $push(&mut self, id: $id_ty) -> u32 {
self.$member.push(id);
(self.$member.len() - 1) as u32
}
/// Gets the ID for a particular index.
///
/// If the index did not exist in the original Wasm binary, an `Err`
/// is returned.
pub fn $get(&self, index: u32) -> Result<$id_ty> {
match self.$member.get(index as usize) {
Some(x) => Ok(*x),
None => bail!(
"index `{}` is out of bounds for {}",
index,
stringify!($member)
),
}
}
}
};
}
define_push_get!(push_table, get_table, TableId, tables);
define_push_get!(push_type, get_type, TypeId, types);
define_push_get!(push_func, get_func, FunctionId, funcs);
define_push_get!(push_global, get_global, GlobalId, globals);
define_push_get!(push_memory, get_memory, MemoryId, memories);
define_push_get!(push_element, get_element, ElementId, elements);
define_push_get!(push_data, get_data, DataId, data);
impl IndicesToIds {
/// Pushes a new local ID to map it to the next index internally
pub(crate) fn push_local(&mut self, function: FunctionId, id: LocalId) -> u32 {
let list = self.locals.entry(function).or_insert(Vec::new());
list.push(id);
(list.len() as u32) - 1
}
/// Gets the ID for a particular index
pub fn get_local(&self, function: FunctionId, index: u32) -> Result<LocalId> {
let locals = match self.locals.get(&function) {
Some(x) => x,
None => bail!(
"function index `{}` is out of bounds for local",
function.index()
),
};
match locals.get(index as usize) {
Some(x) => Ok(*x),
None => bail!(
"index `{}` in function `{}` is out of bounds for local",
index,
function.index(),
),
}
}
}