1bfca842b0
* Move `Func` to its own file * Support `Func` imports with zero shims This commit extends the `Func` type in the `wasmtime` crate with static `wrap*` constructors. The goal of these constructors is to create a `Func` type which has zero shims associated with it, creating as small of a layer as possible between wasm code and calling imported Rust code. This is achieved by creating an `extern "C"` shim function which matches the ABI of what Cranelift will generate, and then the host function is passed directly into an `InstanceHandle` to get called later. This also enables enough inlining opportunities that LLVM will be able to see all functions and inline everything to the point where your function is called immediately from wasm, no questions asked.
615 lines
22 KiB
Rust
615 lines
22 KiB
Rust
use crate::trampoline::{generate_global_export, generate_memory_export, generate_table_export};
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use crate::values::{from_checked_anyfunc, into_checked_anyfunc, Val};
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use crate::Mutability;
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use crate::{ExternType, GlobalType, MemoryType, TableType, ValType};
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use crate::{Func, Store};
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use anyhow::{anyhow, bail, Result};
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use std::rc::Rc;
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use std::slice;
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use wasmtime_environ::wasm;
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use wasmtime_runtime::InstanceHandle;
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// Externals
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/// An external item to a WebAssembly module, or a list of what can possibly be
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/// exported from a wasm module.
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///
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/// This is both returned from [`Instance::exports`](crate::Instance::exports)
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/// as well as required by [`Instance::new`](crate::Instance::new). In other
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/// words, this is the type of extracted values from an instantiated module, and
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/// it's also used to provide imported values when instantiating a module.
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#[derive(Clone)]
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pub enum Extern {
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/// A WebAssembly `func` which can be called.
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Func(Func),
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/// A WebAssembly `global` which acts like a `Cell<T>` of sorts, supporting
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/// `get` and `set` operations.
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Global(Global),
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/// A WebAssembly `table` which is an array of `Val` types.
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Table(Table),
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/// A WebAssembly linear memory.
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Memory(Memory),
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}
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impl Extern {
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/// Returns the underlying `Func`, if this external is a function.
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///
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/// Returns `None` if this is not a function.
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pub fn func(&self) -> Option<&Func> {
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match self {
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Extern::Func(func) => Some(func),
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_ => None,
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}
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}
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/// Returns the underlying `Global`, if this external is a global.
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///
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/// Returns `None` if this is not a global.
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pub fn global(&self) -> Option<&Global> {
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match self {
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Extern::Global(global) => Some(global),
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_ => None,
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}
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}
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/// Returns the underlying `Table`, if this external is a table.
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///
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/// Returns `None` if this is not a table.
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pub fn table(&self) -> Option<&Table> {
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match self {
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Extern::Table(table) => Some(table),
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_ => None,
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}
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}
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/// Returns the underlying `Memory`, if this external is a memory.
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///
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/// Returns `None` if this is not a memory.
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pub fn memory(&self) -> Option<&Memory> {
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match self {
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Extern::Memory(memory) => Some(memory),
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_ => None,
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}
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}
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/// Returns the type associated with this `Extern`.
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pub fn ty(&self) -> ExternType {
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match self {
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Extern::Func(ft) => ExternType::Func(ft.ty().clone()),
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Extern::Memory(ft) => ExternType::Memory(ft.ty().clone()),
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Extern::Table(tt) => ExternType::Table(tt.ty().clone()),
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Extern::Global(gt) => ExternType::Global(gt.ty().clone()),
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}
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}
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pub(crate) fn get_wasmtime_export(&self) -> wasmtime_runtime::Export {
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match self {
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Extern::Func(f) => f.wasmtime_export().clone(),
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Extern::Global(g) => g.wasmtime_export().clone(),
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Extern::Memory(m) => m.wasmtime_export().clone(),
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Extern::Table(t) => t.wasmtime_export().clone(),
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}
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}
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pub(crate) fn from_wasmtime_export(
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store: &Store,
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instance_handle: InstanceHandle,
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export: wasmtime_runtime::Export,
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) -> Extern {
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match export {
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wasmtime_runtime::Export::Function { .. } => {
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Extern::Func(Func::from_wasmtime_function(export, store, instance_handle))
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}
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wasmtime_runtime::Export::Memory { .. } => {
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Extern::Memory(Memory::from_wasmtime_memory(export, store, instance_handle))
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}
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wasmtime_runtime::Export::Global { .. } => {
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Extern::Global(Global::from_wasmtime_global(export, store))
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}
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wasmtime_runtime::Export::Table { .. } => {
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Extern::Table(Table::from_wasmtime_table(export, store, instance_handle))
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}
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}
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}
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}
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impl From<Func> for Extern {
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fn from(r: Func) -> Self {
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Extern::Func(r)
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}
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}
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impl From<Global> for Extern {
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fn from(r: Global) -> Self {
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Extern::Global(r)
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}
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}
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impl From<Memory> for Extern {
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fn from(r: Memory) -> Self {
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Extern::Memory(r)
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}
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}
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impl From<Table> for Extern {
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fn from(r: Table) -> Self {
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Extern::Table(r)
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}
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}
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/// A WebAssembly `global` value which can be read and written to.
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///
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/// A `global` in WebAssembly is sort of like a global variable within an
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/// [`Instance`](crate::Instance). The `global.get` and `global.set`
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/// instructions will modify and read global values in a wasm module. Globals
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/// can either be imported or exported from wasm modules.
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///
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/// If you're familiar with Rust already you can think of a `Global` as a sort
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/// of `Rc<Cell<Val>>`, more or less.
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///
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/// # `Global` and `Clone`
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///
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/// Globals are internally reference counted so you can `clone` a `Global`. The
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/// cloning process only performs a shallow clone, so two cloned `Global`
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/// instances are equivalent in their functionality.
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#[derive(Clone)]
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pub struct Global {
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inner: Rc<GlobalInner>,
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}
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struct GlobalInner {
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_store: Store,
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ty: GlobalType,
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wasmtime_export: wasmtime_runtime::Export,
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#[allow(dead_code)]
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wasmtime_state: Option<crate::trampoline::GlobalState>,
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}
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impl Global {
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/// Creates a new WebAssembly `global` value with the provide type `ty` and
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/// initial value `val`.
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///
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/// The `store` argument provided is used as a general global cache for
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/// information, and otherwise the `ty` and `val` arguments are used to
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/// initialize the global.
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///
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/// # Errors
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///
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/// Returns an error if the `ty` provided does not match the type of the
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/// value `val`.
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pub fn new(store: &Store, ty: GlobalType, val: Val) -> Result<Global> {
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if val.ty() != *ty.content() {
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bail!("value provided does not match the type of this global");
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}
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let (wasmtime_export, wasmtime_state) = generate_global_export(&ty, val)?;
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Ok(Global {
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inner: Rc::new(GlobalInner {
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_store: store.clone(),
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ty,
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wasmtime_export,
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wasmtime_state: Some(wasmtime_state),
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}),
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})
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}
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/// Returns the underlying type of this `global`.
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pub fn ty(&self) -> &GlobalType {
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&self.inner.ty
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}
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fn wasmtime_global_definition(&self) -> *mut wasmtime_runtime::VMGlobalDefinition {
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match self.inner.wasmtime_export {
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wasmtime_runtime::Export::Global { definition, .. } => definition,
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_ => panic!("global definition not found"),
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}
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}
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/// Returns the current [`Val`] of this global.
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pub fn get(&self) -> Val {
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let definition = unsafe { &mut *self.wasmtime_global_definition() };
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unsafe {
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match self.ty().content() {
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ValType::I32 => Val::from(*definition.as_i32()),
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ValType::I64 => Val::from(*definition.as_i64()),
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ValType::F32 => Val::F32(*definition.as_u32()),
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ValType::F64 => Val::F64(*definition.as_u64()),
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_ => unimplemented!("Global::get for {:?}", self.ty().content()),
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}
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}
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}
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/// Attempts to set the current value of this global to [`Val`].
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///
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/// # Errors
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///
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/// Returns an error if this global has a different type than `Val`, or if
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/// it's not a mutable global.
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pub fn set(&self, val: Val) -> Result<()> {
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if self.ty().mutability() != Mutability::Var {
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bail!("immutable global cannot be set");
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}
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if val.ty() != *self.ty().content() {
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bail!(
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"global of type {:?} cannot be set to {:?}",
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self.ty().content(),
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val.ty()
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);
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}
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let definition = unsafe { &mut *self.wasmtime_global_definition() };
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unsafe {
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match val {
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Val::I32(i) => *definition.as_i32_mut() = i,
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Val::I64(i) => *definition.as_i64_mut() = i,
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Val::F32(f) => *definition.as_u32_mut() = f,
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Val::F64(f) => *definition.as_u64_mut() = f,
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_ => unimplemented!("Global::set for {:?}", val.ty()),
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}
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}
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Ok(())
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}
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pub(crate) fn wasmtime_export(&self) -> &wasmtime_runtime::Export {
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&self.inner.wasmtime_export
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}
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pub(crate) fn from_wasmtime_global(export: wasmtime_runtime::Export, store: &Store) -> Global {
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let global = if let wasmtime_runtime::Export::Global { ref global, .. } = export {
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global
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} else {
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panic!("wasmtime export is not global")
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};
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// The original export is coming from wasmtime_runtime itself we should
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// support all the types coming out of it, so assert such here.
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let ty = GlobalType::from_wasmtime_global(&global)
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.expect("core wasm global type should be supported");
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Global {
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inner: Rc::new(GlobalInner {
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_store: store.clone(),
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ty: ty,
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wasmtime_export: export,
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wasmtime_state: None,
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}),
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}
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}
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}
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/// A WebAssembly `table`, or an array of values.
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///
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/// Like [`Memory`] a table is an indexed array of values, but unlike [`Memory`]
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/// it's an array of WebAssembly values rather than bytes. One of the most
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/// common usages of a table is a function table for wasm modules, where each
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/// element has the `Func` type.
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///
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/// Tables, like globals, are not threadsafe and can only be used on one thread.
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/// Tables can be grown in size and each element can be read/written.
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///
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/// # `Table` and `Clone`
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///
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/// Tables are internally reference counted so you can `clone` a `Table`. The
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/// cloning process only performs a shallow clone, so two cloned `Table`
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/// instances are equivalent in their functionality.
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#[derive(Clone)]
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pub struct Table {
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store: Store,
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ty: TableType,
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wasmtime_handle: InstanceHandle,
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wasmtime_export: wasmtime_runtime::Export,
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}
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fn set_table_item(
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handle: &mut InstanceHandle,
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table_index: wasm::DefinedTableIndex,
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item_index: u32,
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item: wasmtime_runtime::VMCallerCheckedAnyfunc,
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) -> Result<()> {
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handle
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.table_set(table_index, item_index, item)
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.map_err(|()| anyhow!("table element index out of bounds"))
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}
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impl Table {
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/// Creates a new `Table` with the given parameters.
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///
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/// * `store` - a global cache to store information in
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/// * `ty` - the type of this table, containing both the element type as
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/// well as the initial size and maximum size, if any.
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/// * `init` - the initial value to fill all table entries with, if the
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/// table starts with an initial size.
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///
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/// # Errors
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///
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/// Returns an error if `init` does not match the element type of the table.
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pub fn new(store: &Store, ty: TableType, init: Val) -> Result<Table> {
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let item = into_checked_anyfunc(init, store)?;
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let (mut wasmtime_handle, wasmtime_export) = generate_table_export(&ty)?;
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// Initialize entries with the init value.
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match wasmtime_export {
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wasmtime_runtime::Export::Table { definition, .. } => {
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let index = wasmtime_handle.table_index(unsafe { &*definition });
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let len = unsafe { (*definition).current_elements };
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for i in 0..len {
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set_table_item(&mut wasmtime_handle, index, i, item.clone())?;
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}
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}
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_ => unreachable!("export should be a table"),
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}
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Ok(Table {
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store: store.clone(),
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ty,
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wasmtime_handle,
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wasmtime_export,
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})
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}
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/// Returns the underlying type of this table, including its element type as
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/// well as the maximum/minimum lower bounds.
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pub fn ty(&self) -> &TableType {
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&self.ty
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}
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fn wasmtime_table_index(&self) -> wasm::DefinedTableIndex {
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match self.wasmtime_export {
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wasmtime_runtime::Export::Table { definition, .. } => {
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self.wasmtime_handle.table_index(unsafe { &*definition })
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}
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_ => panic!("global definition not found"),
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}
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}
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/// Returns the table element value at `index`.
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///
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/// Returns `None` if `index` is out of bounds.
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pub fn get(&self, index: u32) -> Option<Val> {
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let table_index = self.wasmtime_table_index();
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let item = self.wasmtime_handle.table_get(table_index, index)?;
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Some(from_checked_anyfunc(item, &self.store))
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}
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/// Writes the `val` provided into `index` within this table.
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///
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/// # Errors
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///
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/// Returns an error if `index` is out of bounds or if `val` does not have
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/// the right type to be stored in this table.
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pub fn set(&self, index: u32, val: Val) -> Result<()> {
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let table_index = self.wasmtime_table_index();
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let mut wasmtime_handle = self.wasmtime_handle.clone();
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let item = into_checked_anyfunc(val, &self.store)?;
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set_table_item(&mut wasmtime_handle, table_index, index, item)
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}
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/// Returns the current size of this table.
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pub fn size(&self) -> u32 {
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match self.wasmtime_export {
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wasmtime_runtime::Export::Table { definition, .. } => unsafe {
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(*definition).current_elements
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},
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_ => panic!("global definition not found"),
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}
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}
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/// Grows the size of this table by `delta` more elements, initialization
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/// all new elements to `init`.
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///
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/// # Errors
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///
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/// Returns an error if the table cannot be grown by `delta`, for example
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/// if it would cause the table to exceed its maximum size. Also returns an
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/// error if `init` is not of the right type.
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pub fn grow(&self, delta: u32, init: Val) -> Result<u32> {
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let index = self.wasmtime_table_index();
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let item = into_checked_anyfunc(init, &self.store)?;
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if let Some(len) = self.wasmtime_handle.clone().table_grow(index, delta) {
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let mut wasmtime_handle = self.wasmtime_handle.clone();
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for i in 0..delta {
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let i = len - (delta - i);
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set_table_item(&mut wasmtime_handle, index, i, item.clone())?;
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}
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Ok(len)
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} else {
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bail!("failed to grow table by `{}`", delta)
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}
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}
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pub(crate) fn wasmtime_export(&self) -> &wasmtime_runtime::Export {
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&self.wasmtime_export
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}
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pub(crate) fn from_wasmtime_table(
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export: wasmtime_runtime::Export,
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store: &Store,
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instance_handle: wasmtime_runtime::InstanceHandle,
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) -> Table {
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let table = if let wasmtime_runtime::Export::Table { ref table, .. } = export {
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table
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} else {
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panic!("wasmtime export is not table")
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};
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let ty = TableType::from_wasmtime_table(&table.table);
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Table {
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store: store.clone(),
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ty: ty,
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wasmtime_handle: instance_handle,
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wasmtime_export: export,
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}
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}
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}
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/// A WebAssembly linear memory.
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///
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/// WebAssembly memories represent a contiguous array of bytes that have a size
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/// that is always a multiple of the WebAssembly page size, currently 64
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/// kilobytes.
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///
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/// WebAssembly memory is used for global data, statics in C/C++/Rust, shadow
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/// stack memory, etc. Accessing wasm memory is generally quite fast!
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///
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/// # `Memory` and `Clone`
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///
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/// Memories are internally reference counted so you can `clone` a `Memory`. The
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/// cloning process only performs a shallow clone, so two cloned `Memory`
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/// instances are equivalent in their functionality.
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///
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/// # `Memory` and threads
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///
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/// It is intended that `Memory` is safe to share between threads. At this time
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/// this is not implemented in `wasmtime`, however. This is planned to be
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/// implemented though!
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#[derive(Clone)]
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pub struct Memory {
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_store: Store,
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ty: MemoryType,
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wasmtime_handle: InstanceHandle,
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wasmtime_export: wasmtime_runtime::Export,
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}
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impl Memory {
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/// Creates a new WebAssembly memory given the configuration of `ty`.
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///
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/// The `store` argument is a general location for cache information, and
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/// otherwise the memory will immediately be allocated according to the
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/// type's configuration. All WebAssembly memory is initialized to zero.
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pub fn new(store: &Store, ty: MemoryType) -> Memory {
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let (wasmtime_handle, wasmtime_export) =
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generate_memory_export(&ty).expect("generated memory");
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Memory {
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_store: store.clone(),
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ty,
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wasmtime_handle,
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wasmtime_export,
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}
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}
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/// Returns the underlying type of this memory.
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pub fn ty(&self) -> &MemoryType {
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&self.ty
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}
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fn wasmtime_memory_definition(&self) -> *mut wasmtime_runtime::VMMemoryDefinition {
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match self.wasmtime_export {
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wasmtime_runtime::Export::Memory { definition, .. } => definition,
|
|
_ => panic!("memory definition not found"),
|
|
}
|
|
}
|
|
|
|
/// Returns this memory as a slice view that can be read natively in Rust.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// This is an unsafe operation because there is no guarantee that the
|
|
/// following operations do not happen concurrently while the slice is in
|
|
/// use:
|
|
///
|
|
/// * Data could be modified by calling into a wasm module.
|
|
/// * Memory could be relocated through growth by calling into a wasm
|
|
/// module.
|
|
/// * When threads are supported, non-atomic reads will race with other
|
|
/// writes.
|
|
///
|
|
/// Extreme care need be taken when the data of a `Memory` is read. The
|
|
/// above invariants all need to be upheld at a bare minimum, and in
|
|
/// general you'll need to ensure that while you're looking at slice you're
|
|
/// the only one who can possibly look at the slice and read/write it.
|
|
///
|
|
/// Be sure to keep in mind that `Memory` is reference counted, meaning
|
|
/// that there may be other users of this `Memory` instance elsewhere in
|
|
/// your program. Additionally `Memory` can be shared and used in any number
|
|
/// of wasm instances, so calling any wasm code should be considered
|
|
/// dangerous while you're holding a slice of memory.
|
|
pub unsafe fn data_unchecked(&self) -> &[u8] {
|
|
self.data_unchecked_mut()
|
|
}
|
|
|
|
/// Returns this memory as a slice view that can be read and written
|
|
/// natively in Rust.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// All of the same safety caveats of [`Memory::data_unchecked`] apply
|
|
/// here, doubly so because this is returning a mutable slice! As a
|
|
/// double-extra reminder, remember that `Memory` is reference counted, so
|
|
/// you can very easily acquire two mutable slices by simply calling this
|
|
/// function twice. Extreme caution should be used when using this method,
|
|
/// and in general you probably want to result to unsafe accessors and the
|
|
/// `data` methods below.
|
|
pub unsafe fn data_unchecked_mut(&self) -> &mut [u8] {
|
|
let definition = &*self.wasmtime_memory_definition();
|
|
slice::from_raw_parts_mut(definition.base, definition.current_length)
|
|
}
|
|
|
|
/// Returns the base pointer, in the host's address space, that the memory
|
|
/// is located at.
|
|
///
|
|
/// When reading and manipulating memory be sure to read up on the caveats
|
|
/// of [`Memory::data_unchecked`] to make sure that you can safely
|
|
/// read/write the memory.
|
|
pub fn data_ptr(&self) -> *mut u8 {
|
|
unsafe { (*self.wasmtime_memory_definition()).base }
|
|
}
|
|
|
|
/// Returns the byte length of this memory.
|
|
///
|
|
/// The returned value will be a multiple of the wasm page size, 64k.
|
|
pub fn data_size(&self) -> usize {
|
|
unsafe { (*self.wasmtime_memory_definition()).current_length }
|
|
}
|
|
|
|
/// Returns the size, in pages, of this wasm memory.
|
|
pub fn size(&self) -> u32 {
|
|
(self.data_size() / wasmtime_environ::WASM_PAGE_SIZE as usize) as u32
|
|
}
|
|
|
|
/// Grows this WebAssembly memory by `delta` pages.
|
|
///
|
|
/// This will attempt to add `delta` more pages of memory on to the end of
|
|
/// this `Memory` instance. If successful this may relocate the memory and
|
|
/// cause [`Memory::data_ptr`] to return a new value. Additionally previous
|
|
/// slices into this memory may no longer be valid.
|
|
///
|
|
/// On success returns the number of pages this memory previously had
|
|
/// before the growth succeeded.
|
|
///
|
|
/// # Errors
|
|
///
|
|
/// Returns an error if memory could not be grown, for example if it exceeds
|
|
/// the maximum limits of this memory.
|
|
pub fn grow(&self, delta: u32) -> Result<u32> {
|
|
match self.wasmtime_export {
|
|
wasmtime_runtime::Export::Memory { definition, .. } => {
|
|
let definition = unsafe { &(*definition) };
|
|
let index = self.wasmtime_handle.memory_index(definition);
|
|
self.wasmtime_handle
|
|
.clone()
|
|
.memory_grow(index, delta)
|
|
.ok_or_else(|| anyhow!("failed to grow memory"))
|
|
}
|
|
_ => panic!("memory definition not found"),
|
|
}
|
|
}
|
|
|
|
pub(crate) fn wasmtime_export(&self) -> &wasmtime_runtime::Export {
|
|
&self.wasmtime_export
|
|
}
|
|
|
|
pub(crate) fn from_wasmtime_memory(
|
|
export: wasmtime_runtime::Export,
|
|
store: &Store,
|
|
instance_handle: wasmtime_runtime::InstanceHandle,
|
|
) -> Memory {
|
|
let memory = if let wasmtime_runtime::Export::Memory { ref memory, .. } = export {
|
|
memory
|
|
} else {
|
|
panic!("wasmtime export is not memory")
|
|
};
|
|
let ty = MemoryType::from_wasmtime_memory(&memory.memory);
|
|
Memory {
|
|
_store: store.clone(),
|
|
ty: ty,
|
|
wasmtime_handle: instance_handle,
|
|
wasmtime_export: export,
|
|
}
|
|
}
|
|
}
|