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use crate::sys::exports::{ExportError, Exportable};
use crate::sys::externals::Extern;
use crate::sys::store::{AsStoreMut, AsStoreRef};
use crate::sys::RuntimeError;
use crate::sys::TableType;
use crate::{ExternRef, Function, Value};
use wasmer_vm::{InternalStoreHandle, StoreHandle, TableElement, VMExtern, VMTable};
#[derive(Debug, Clone)]
pub struct Table {
handle: StoreHandle<VMTable>,
}
fn set_table_item(
table: &mut VMTable,
item_index: u32,
item: TableElement,
) -> Result<(), RuntimeError> {
table.set(item_index, item).map_err(|e| e.into())
}
fn value_to_table_element(
store: &mut impl AsStoreMut,
val: Value,
) -> Result<wasmer_vm::TableElement, RuntimeError> {
if !val.is_from_store(store) {
return Err(RuntimeError::new("cannot pass Value across contexts"));
}
Ok(match val {
Value::ExternRef(extern_ref) => {
wasmer_vm::TableElement::ExternRef(extern_ref.map(|e| e.vm_externref()))
}
Value::FuncRef(func_ref) => {
wasmer_vm::TableElement::FuncRef(func_ref.map(|f| f.vm_funcref(store)))
}
_ => return Err(RuntimeError::new("val is not reference")),
})
}
#[cfg(feature = "compiler")]
fn value_from_table_element(store: &mut impl AsStoreMut, item: wasmer_vm::TableElement) -> Value {
match item {
wasmer_vm::TableElement::FuncRef(funcref) => {
Value::FuncRef(funcref.map(|f| unsafe { Function::from_vm_funcref(store, f) }))
}
wasmer_vm::TableElement::ExternRef(extern_ref) => {
Value::ExternRef(extern_ref.map(|e| unsafe { ExternRef::from_vm_externref(store, e) }))
}
}
}
impl Table {
#[cfg(feature = "compiler")]
pub fn new(
mut store: &mut impl AsStoreMut,
ty: TableType,
init: Value,
) -> Result<Self, RuntimeError> {
let item = value_to_table_element(&mut store, init)?;
let mut store = store.as_store_mut();
let tunables = store.tunables();
let style = tunables.table_style(&ty);
let mut table = tunables
.create_host_table(&ty, &style)
.map_err(RuntimeError::new)?;
let num_elements = table.size();
for i in 0..num_elements {
set_table_item(&mut table, i, item.clone())?;
}
Ok(Self {
handle: StoreHandle::new(store.objects_mut(), table),
})
}
pub fn ty(&self, store: &impl AsStoreRef) -> TableType {
*self.handle.get(store.as_store_ref().objects()).ty()
}
#[cfg(feature = "compiler")]
pub fn get(&self, store: &mut impl AsStoreMut, index: u32) -> Option<Value> {
let item = self.handle.get(store.as_store_ref().objects()).get(index)?;
Some(value_from_table_element(store, item))
}
pub fn set(
&self,
store: &mut impl AsStoreMut,
index: u32,
val: Value,
) -> Result<(), RuntimeError> {
let item = value_to_table_element(store, val)?;
set_table_item(self.handle.get_mut(store.objects_mut()), index, item)
}
pub fn size(&self, store: &impl AsStoreRef) -> u32 {
self.handle.get(store.as_store_ref().objects()).size()
}
pub fn grow(
&self,
store: &mut impl AsStoreMut,
delta: u32,
init: Value,
) -> Result<u32, RuntimeError> {
let item = value_to_table_element(store, init)?;
self.handle
.get_mut(store.objects_mut())
.grow(delta, item)
.ok_or_else(|| RuntimeError::new(format!("failed to grow table by `{}`", delta)))
}
pub fn copy(
store: &mut impl AsStoreMut,
dst_table: &Self,
dst_index: u32,
src_table: &Self,
src_index: u32,
len: u32,
) -> Result<(), RuntimeError> {
if dst_table.handle.store_id() != src_table.handle.store_id() {
return Err(RuntimeError::new(
"cross-`Context` table copies are not supported",
));
}
let store = store;
if dst_table.handle.internal_handle() == src_table.handle.internal_handle() {
let table = dst_table.handle.get_mut(store.objects_mut());
table.copy_within(dst_index, src_index, len)
} else {
let (src_table, dst_table) = store.objects_mut().get_2_mut(
src_table.handle.internal_handle(),
dst_table.handle.internal_handle(),
);
VMTable::copy(dst_table, src_table, dst_index, src_index, len)
}
.map_err(RuntimeError::from_trap)?;
Ok(())
}
pub(crate) fn from_vm_extern(
store: &mut impl AsStoreMut,
internal: InternalStoreHandle<VMTable>,
) -> Self {
Self {
handle: unsafe {
StoreHandle::from_internal(store.as_store_ref().objects().id(), internal)
},
}
}
pub fn is_from_store(&self, store: &impl AsStoreRef) -> bool {
self.handle.store_id() == store.as_store_ref().objects().id()
}
pub(crate) fn to_vm_extern(&self) -> VMExtern {
VMExtern::Table(self.handle.internal_handle())
}
}
impl std::cmp::PartialEq for Table {
fn eq(&self, other: &Self) -> bool {
self.handle == other.handle
}
}
impl std::cmp::Eq for Table {}
impl<'a> Exportable<'a> for Table {
fn get_self_from_extern(_extern: &'a Extern) -> Result<&'a Self, ExportError> {
match _extern {
Extern::Table(table) => Ok(table),
_ => Err(ExportError::IncompatibleType),
}
}
}
#[test]
fn test_table_grow_issue_3197() {
use crate::{imports, Instance, Module, Store, Table, TableType, Type, Value};
const WAT: &str = r#"(module (table (import "env" "table") 100 funcref))"#;
let mut store = Store::default();
let module = Module::new(&store, WAT).unwrap();
let ty = TableType::new(Type::FuncRef, 0, None);
let table = Table::new(&mut store, ty, Value::FuncRef(None)).unwrap();
table.grow(&mut store, 100, Value::FuncRef(None)).unwrap();
assert_eq!(table.ty(&store).minimum, 0);
let imports = imports! {"env" => {"table" => table}};
let _instance = Instance::new(&mut store, &module, &imports).unwrap();
}