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use crate::emit::{Emit, EmitContext, Section};
use crate::parse::IndicesToIds;
use crate::{FunctionId, GlobalId, ImportId, Module, Result};
use id_arena::{Arena, Id};
pub type TableId = Id<Table>;
#[derive(Debug)]
pub struct Table {
id: TableId,
pub initial: u32,
pub maximum: Option<u32>,
pub kind: TableKind,
pub import: Option<ImportId>,
}
#[derive(Debug)]
pub enum TableKind {
Function(FunctionTable),
}
#[derive(Debug, Default)]
pub struct FunctionTable {
pub elements: Vec<Option<FunctionId>>,
pub relative_elements: Vec<(GlobalId, Vec<FunctionId>)>,
}
impl Table {
pub fn id(&self) -> TableId {
self.id
}
}
impl Emit for Table {
fn emit(&self, cx: &mut EmitContext) {
match self.kind {
TableKind::Function(_) => {
cx.encoder.byte(0x70);
}
}
cx.encoder.byte(self.maximum.is_some() as u8);
cx.encoder.u32(self.initial);
if let Some(m) = self.maximum {
cx.encoder.u32(m);
}
}
}
#[derive(Debug, Default)]
pub struct ModuleTables {
arena: Arena<Table>,
}
impl ModuleTables {
pub fn add_import(
&mut self,
initial: u32,
max: Option<u32>,
kind: TableKind,
import: ImportId,
) -> TableId {
let id = self.arena.next_id();
self.arena.alloc(Table {
id,
initial: initial,
maximum: max,
kind,
import: Some(import),
})
}
pub fn add_local(&mut self, initial: u32, max: Option<u32>, kind: TableKind) -> TableId {
let id = self.arena.next_id();
let id2 = self.arena.alloc(Table {
id,
initial: initial,
maximum: max,
kind,
import: None,
});
debug_assert_eq!(id, id2);
id
}
pub fn get(&self, table: TableId) -> &Table {
&self.arena[table]
}
pub fn get_mut(&mut self, table: TableId) -> &mut Table {
&mut self.arena[table]
}
pub fn iter(&self) -> impl Iterator<Item = &Table> {
self.arena.iter().map(|p| p.1)
}
}
impl Module {
pub(crate) fn parse_tables(
&mut self,
section: wasmparser::TableSectionReader,
ids: &mut IndicesToIds,
) -> Result<()> {
log::debug!("parse table section");
for t in section {
let t = t?;
let id = self.tables.add_local(
t.limits.initial,
t.limits.maximum,
match t.element_type {
wasmparser::Type::AnyFunc => TableKind::Function(FunctionTable::default()),
_ => failure::bail!("invalid table type"),
},
);
ids.push_table(id);
}
Ok(())
}
}
impl Emit for ModuleTables {
fn emit(&self, cx: &mut EmitContext) {
log::debug!("emit table section");
let emitted = |cx: &EmitContext, table: &Table| {
cx.used.tables.contains(&table.id) && table.import.is_none()
};
let tables = self
.arena
.iter()
.filter(|(_id, table)| emitted(cx, table))
.count();
if tables == 0 {
return;
}
let mut cx = cx.start_section(Section::Table);
cx.encoder.usize(tables);
for (id, table) in self.arena.iter() {
if emitted(&cx, table) {
cx.indices.push_table(id);
table.emit(&mut cx);
}
}
}
}