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use crate::{ error::CreationError, instance::DynFunc, sig_registry::SigRegistry, structures::TypedIndex, types::{FuncSig, TableDescriptor}, vm, }; use std::{ptr, sync::Arc}; enum AnyfuncInner<'a> { Host { ptr: *const vm::Func, signature: Arc<FuncSig>, }, Managed(DynFunc<'a>), } pub struct Anyfunc<'a> { inner: AnyfuncInner<'a>, } impl<'a> Anyfunc<'a> { pub unsafe fn new<Sig>(func: *const vm::Func, signature: Sig) -> Self where Sig: Into<Arc<FuncSig>>, { Self { inner: AnyfuncInner::Host { ptr: func as _, signature: signature.into(), }, } } } impl<'a> From<DynFunc<'a>> for Anyfunc<'a> { fn from(function: DynFunc<'a>) -> Self { Anyfunc { inner: AnyfuncInner::Managed(function), } } } pub struct AnyfuncTable { backing: Vec<vm::Anyfunc>, max: Option<u32>, } impl AnyfuncTable { pub fn new( desc: TableDescriptor, local: &mut vm::LocalTable, ) -> Result<Box<Self>, CreationError> { let initial_table_backing_len = desc.minimum as usize; let mut storage = Box::new(AnyfuncTable { backing: vec![vm::Anyfunc::null(); initial_table_backing_len], max: desc.maximum, }); let storage_ptr: *mut AnyfuncTable = &mut *storage; local.base = storage.backing.as_mut_ptr() as *mut u8; local.count = storage.backing.len(); local.table = storage_ptr as *mut (); Ok(storage) } pub fn current_size(&self) -> u32 { self.backing.len() as u32 } pub fn internal_buffer(&mut self) -> &mut [vm::Anyfunc] { &mut self.backing } pub fn grow(&mut self, delta: u32, local: &mut vm::LocalTable) -> Option<u32> { let starting_len = self.backing.len() as u32; let new_len = starting_len.checked_add(delta)?; if let Some(max) = self.max { if new_len > max { return None; } } self.backing.resize(new_len as usize, vm::Anyfunc::null()); local.base = self.backing.as_mut_ptr() as *mut u8; local.count = self.backing.len(); Some(starting_len) } pub fn set(&mut self, index: u32, element: Anyfunc) -> Result<(), ()> { if let Some(slot) = self.backing.get_mut(index as usize) { let anyfunc = match element.inner { AnyfuncInner::Host { ptr, signature } => { let sig_index = SigRegistry.lookup_sig_index(signature); let sig_id = vm::SigId(sig_index.index() as u32); vm::Anyfunc { func: ptr, ctx: ptr::null_mut(), sig_id, } } AnyfuncInner::Managed(ref func) => { let sig_index = SigRegistry.lookup_sig_index(Arc::clone(&func.signature)); let sig_id = vm::SigId(sig_index.index() as u32); vm::Anyfunc { func: func.raw(), ctx: func.instance_inner.vmctx, sig_id, } } }; *slot = anyfunc; Ok(()) } else { Err(()) } } }