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Revert "Remove the need for HostRef<Module> (#778)"

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This reverts commit 7b33f1c619.

Pushed a few extra commits by accident, so reverting this.
This commit is contained in:
Alex Crichton
2020-01-08 12:44:59 -08:00
parent 7b33f1c619
commit eb1991c579
22 changed files with 130 additions and 221 deletions
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3
crates/api/examples/gcd.rs
View File

@@ -38,10 +38,11 @@ fn main() -> anyhow::Result<()> {
// `Module` which is attached to a `Store` cache.
let wasm = wat::parse_str(WAT)?;
let store = Store::default();
let module = Module::new(&store, &wasm)?;
let module = HostRef::new(Module::new(&store, &wasm)?);
// Find index of the `gcd` export.
let gcd_index = module
.borrow()
.exports()
.iter()
.enumerate()

2
crates/api/examples/hello.rs
View File

@@ -35,7 +35,7 @@ fn main() -> Result<()> {
// Compiler the `*.wasm` binary into an in-memory instance of a `Module`.
println!("Compiling module...");
let module = Module::new(&store, &binary).context("> Error compiling module!")?;
let module = HostRef::new(Module::new(&store, &binary).context("> Error compiling module!")?);
// Here we handle the imports of the module, which in this case is our
// `HelloCallback` type and its associated implementation of `Callback.

2
crates/api/examples/memory.rs
View File

@@ -86,7 +86,7 @@ fn main() -> Result<(), Error> {
// Compile.
println!("Compiling module...");
let module = Module::new(&store, &binary).context("> Error compiling module!")?;
let module = HostRef::new(Module::new(&store, &binary).context("> Error compiling module!")?);
// Instantiate.
println!("Instantiating module...");

2
crates/api/examples/multi.rs
View File

@@ -54,7 +54,7 @@ fn main() -> Result<()> {
// Compile.
println!("Compiling module...");
let module = Module::new(&store, &binary).context("Error compiling module!")?;
let module = HostRef::new(Module::new(&store, &binary).context("Error compiling module!")?);
// Create external print functions.
println!("Creating callback...");

2
crates/api/src/callable.rs
View File

@@ -43,7 +43,7 @@ use wasmtime_runtime::Export;
///
/// // Initialise environment and our module.
/// let store = wasmtime::Store::default();
/// let module = wasmtime::Module::new(&store, &binary)?;
/// let module = HostRef::new(wasmtime::Module::new(&store, &binary)?);
///
/// // Define the type of the function we're going to call.
/// let times_two_type = wasmtime::FuncType::new(

27
crates/api/src/instance.rs
View File

@@ -1,6 +1,7 @@
use crate::context::Context;
use crate::externals::Extern;
use crate::module::Module;
use crate::r#ref::HostRef;
use crate::runtime::Store;
use crate::trampoline::take_api_trap;
use crate::trap::Trap;
@@ -59,7 +60,7 @@ pub fn instantiate_in_context(
pub struct Instance {
instance_handle: InstanceHandle,
module: Module,
module: HostRef<Module>,
// We need to keep CodeMemory alive.
contexts: HashSet<Context>,
@@ -68,19 +69,29 @@ pub struct Instance {
}
impl Instance {
pub fn new(store: &Store, module: &Module, externs: &[Extern]) -> Result<Instance, Error> {
pub fn new(
store: &Store,
module: &HostRef<Module>,
externs: &[Extern],
) -> Result<Instance, Error> {
let context = store.context().clone();
let exports = store.global_exports().clone();
let imports = module
.borrow()
.imports()
.iter()
.zip(externs.iter())
.map(|(i, e)| (i.module().to_string(), i.name().to_string(), e.clone()))
.collect::<Vec<_>>();
let (mut instance_handle, contexts) =
instantiate_in_context(module.binary().expect("binary"), imports, context, exports)?;
let (mut instance_handle, contexts) = instantiate_in_context(
module.borrow().binary().expect("binary"),
imports,
context,
exports,
)?;
let exports = {
let module = module.borrow();
let mut exports = Vec::with_capacity(module.exports().len());
for export in module.exports() {
let name = export.name().to_string();
@@ -105,13 +116,14 @@ impl Instance {
&self.exports
}
pub fn module(&self) -> &Module {
pub fn module(&self) -> &HostRef<Module> {
&self.module
}
pub fn find_export_by_name(&self, name: &str) -> Option<&Extern> {
let (i, _) = self
.module
.borrow()
.exports()
.iter()
.enumerate()
@@ -142,7 +154,10 @@ impl Instance {
));
}
let module = Module::from_exports(store, exports_types.into_boxed_slice());
let module = HostRef::new(Module::from_exports(
store,
exports_types.into_boxed_slice(),
));
Instance {
instance_handle,

154
crates/api/src/module.rs
View File

@@ -4,7 +4,6 @@ use crate::types::{
TableType, ValType,
};
use anyhow::{Error, Result};
use std::rc::Rc;
use wasmparser::{
validate, ExternalKind, ImportSectionEntryType, ModuleReader, OperatorValidatorConfig,
SectionCode, ValidatingParserConfig,
@@ -171,27 +170,8 @@ pub(crate) enum ModuleCodeSource {
Unknown,
}
/// A compiled WebAssembly module, ready to be instantiated.
///
/// A `Module` is a compiled in-memory representation of an input WebAssembly
/// binary. A `Module` is then used to create an [`Instance`](crate::Instance)
/// through an instantiation process. You cannot call functions or fetch
/// globals, for example, on a `Module` because it's purely a code
/// representation. Instead you'll need to create an
/// [`Instance`](crate::Instance) to interact with the wasm module.
///
/// ## Modules and `Clone`
///
/// Using `clone` on a `Module` is a cheap operation. It will not create an
/// entirely new module, but rather just a new reference to the existing module.
/// In other words it's a shallow copy, not a deep copy.
#[derive(Clone)]
pub struct Module {
// FIXME(#777) should be `Arc` and this type should be thread-safe
inner: Rc<ModuleInner>,
}
struct ModuleInner {
store: Store,
source: ModuleCodeSource,
imports: Box<[ImportType]>,
@@ -199,106 +179,29 @@ struct ModuleInner {
}
impl Module {
/// Creates a new WebAssembly `Module` from the given in-memory `binary`
/// data.
///
/// The `binary` data provided must be a [binary-encoded][binary]
/// WebAssembly module. This means that the data for the wasm module must be
/// loaded in-memory if it's present elsewhere, for example on disk.
/// Additionally this requires that the entire binary is loaded into memory
/// all at once, this API does not support streaming compilation of a
/// module.
///
/// The WebAssembly binary will be decoded and validated. It will also be
/// compiled according to the configuration of the provided `store` and
/// cached in this type.
///
/// The provided `store` is a global cache for compiled resources as well as
/// configuration for what wasm features are enabled. It's recommended to
/// share a `store` among modules if possible.
///
/// # Errors
///
/// This function may fail and return an error. Errors may include
/// situations such as:
///
/// * The binary provided could not be decoded because it's not a valid
/// WebAssembly binary
/// * The WebAssembly binary may not validate (e.g. contains type errors)
/// * Implementation-specific limits were exceeded with a valid binary (for
/// example too many locals)
/// * The wasm binary may use features that are not enabled in the
/// configuration of `store`
///
/// The error returned should contain full information about why module
/// creation failed if one is returned.
///
/// [binary]: https://webassembly.github.io/spec/core/binary/index.html
/// Validate and decode the raw wasm data in `binary` and create a new
/// `Module` in the given `store`.
pub fn new(store: &Store, binary: &[u8]) -> Result<Module> {
Self::validate(store, binary)?;
// Note that the call to `unsafe` here should be ok because we
// previously validated the binary, meaning we're guaranteed to pass a
// valid binary for `store`.
unsafe { Self::new_unchecked(store, binary) }
Self::new_unchecked(store, binary)
}
/// Creates a new WebAssembly `Module` from the given in-memory `binary`
/// data, skipping validation and asserting that `binary` is a valid
/// WebAssembly module.
///
/// This function is the same as [`Module::new`] except that it skips the
/// call to [`Module::validate`]. This means that the WebAssembly binary is
/// not validated for correctness and it is simply assumed as valid.
///
/// For more information about creation of a module and the `store` argument
/// see the documentation of [`Module::new`].
///
/// # Unsafety
///
/// This function is `unsafe` due to the unchecked assumption that the input
/// `binary` is valid. If the `binary` is not actually a valid wasm binary it
/// may cause invalid machine code to get generated, cause panics, etc.
///
/// It is only safe to call this method if [`Module::validate`] succeeds on
/// the same arguments passed to this function.
///
/// # Errors
///
/// This function may fail for many of the same reasons as [`Module::new`].
/// While this assumes that the binary is valid it still needs to actually
/// be somewhat valid for decoding purposes, and the basics of decoding can
/// still fail.
pub unsafe fn new_unchecked(store: &Store, binary: &[u8]) -> Result<Module> {
/// Similar to `new`, but does not perform any validation. Only use this
/// on modules which are known to have been validated already!
pub fn new_unchecked(store: &Store, binary: &[u8]) -> Result<Module> {
let (imports, exports) = read_imports_and_exports(binary)?;
Ok(Module {
inner: Rc::new(ModuleInner {
store: store.clone(),
source: ModuleCodeSource::Binary(binary.into()),
imports,
exports,
}),
})
}
/// Validates `binary` input data as a WebAssembly binary given the
/// configuration in `store`.
///
/// This function will perform a speedy validation of the `binary` input
/// WebAssembly module (which is in [binary form][binary]) and return either
/// `Ok` or `Err` depending on the results of validation. The `store`
/// argument indicates configuration for WebAssembly features, for example,
/// which are used to indicate what should be valid and what shouldn't be.
///
/// Validation automatically happens as part of [`Module::new`], but is a
/// requirement for [`Module::new_unchecked`] to be safe.
///
/// # Errors
///
/// If validation fails for any reason (type check error, usage of a feature
/// that wasn't enabled, etc) then an error with a description of the
/// validation issue will be returned.
///
/// [binary]: https://webassembly.github.io/spec/core/binary/index.html
pub(crate) fn binary(&self) -> Option<&[u8]> {
match &self.source {
ModuleCodeSource::Binary(b) => Some(b),
_ => None,
}
}
pub fn validate(store: &Store, binary: &[u8]) -> Result<()> {
let features = store.engine().config.features.clone();
let config = ValidatingParserConfig {
@@ -312,39 +215,18 @@ impl Module {
};
validate(binary, Some(config)).map_err(Error::new)
}
pub fn imports(&self) -> &[ImportType] {
&self.imports
}
pub fn exports(&self) -> &[ExportType] {
&self.exports
}
pub fn from_exports(store: &Store, exports: Box<[ExportType]>) -> Self {
Module {
inner: Rc::new(ModuleInner {
store: store.clone(),
source: ModuleCodeSource::Unknown,
imports: Box::new([]),
exports,
}),
}
}
pub(crate) fn binary(&self) -> Option<&[u8]> {
match &self.inner.source {
ModuleCodeSource::Binary(b) => Some(b),
_ => None,
}
}
/// Returns the list of imports that this [`Module`] has and must be
/// satisfied.
pub fn imports(&self) -> &[ImportType] {
&self.inner.imports
}
/// Returns the list of exports that this [`Module`] has and will be
/// available after instantiation.
pub fn exports(&self) -> &[ExportType] {
&self.inner.exports
}
/// Returns the [`Store`] that this [`Module`] was compiled into.
pub fn store(&self) -> &Store {
&self.inner.store
}
}

1
crates/api/src/runtime.rs
View File

@@ -331,7 +331,6 @@ impl Engine {
/// ocnfiguration (see [`Config`] for more information).
#[derive(Clone)]
pub struct Store {
// FIXME(#777) should be `Arc` and this type should be thread-safe
inner: Rc<StoreInner>,
}

2
crates/api/src/wasm.rs
View File

@@ -662,7 +662,7 @@ pub unsafe extern "C" fn wasm_instance_new(
let import = *imports.add(i);
externs.push((*import).ext.clone());
}
let module = &(*module).module.borrow();
let module = &(*module).module;
match Instance::new(store, module, &externs) {
Ok(instance) => {
let instance = Box::new(wasm_instance_t {

2
crates/api/tests/import_calling_export.rs
View File

@@ -34,7 +34,7 @@ fn test_import_calling_export() {
let store = Store::default();
let wasm = wat::parse_str(WAT).unwrap();
let module = Module::new(&store, &wasm).expect("failed to create module");
let module = HostRef::new(Module::new(&store, &wasm).expect("failed to create module"));
let callback = Rc::new(Callback {
other: RefCell::new(None),

8
crates/api/tests/import_calling_export.wat Normal file
View File

@@ -0,0 +1,8 @@
(module
(type $t0 (func))
(import "" "imp" (func $.imp (type $t0)))
(func $run call $.imp)
(func $other)
(export "run" (func $run))
(export "other" (func $other))
)

5
crates/api/tests/traps.rs
View File

@@ -23,8 +23,9 @@ fn test_trap_return() -> Result<(), String> {
)
.map_err(|e| format!("failed to parse WebAssembly text source: {}", e))?;
let module =
Module::new(&store, &binary).map_err(|e| format!("failed to compile module: {}", e))?;
let module = HostRef::new(
Module::new(&store, &binary).map_err(|e| format!("failed to compile module: {}", e))?,
);
let hello_type = FuncType::new(Box::new([]), Box::new([]));
let hello_func = HostRef::new(Func::new(&store, hello_type, Rc::new(HelloCallback)));

19
crates/fuzzing/src/oracles.rs
View File

@@ -44,9 +44,12 @@ pub fn instantiate(wasm: &[u8], strategy: Strategy) {
let engine = Engine::new(&config);
let store = Store::new(&engine);
let module = Module::new(&store, wasm).expect("Failed to compile a valid Wasm module!");
let module =
HostRef::new(Module::new(&store, wasm).expect("Failed to compile a valid Wasm module!"));
let imports = match dummy_imports(&store, module.imports()) {
let imports = {
let module = module.borrow();
match dummy_imports(&store, module.imports()) {
Ok(imps) => imps,
Err(_) => {
// There are some value types that we can't synthesize a
@@ -54,6 +57,7 @@ pub fn instantiate(wasm: &[u8], strategy: Strategy) {
// import things of these types we skip instantiation.
return;
}
}
};
// Don't unwrap this: there can be instantiation-/link-time errors that
@@ -88,7 +92,7 @@ pub fn make_api_calls(api: crate::generators::api::ApiCalls) {
let mut config: Option<Config> = None;
let mut engine: Option<Engine> = None;
let mut store: Option<Store> = None;
let mut modules: HashMap<usize, Module> = Default::default();
let mut modules: HashMap<usize, HostRef<Module>> = Default::default();
let mut instances: HashMap<usize, HostRef<Instance>> = Default::default();
for call in api.calls {
@@ -113,10 +117,10 @@ pub fn make_api_calls(api: crate::generators::api::ApiCalls) {
}
ApiCall::ModuleNew { id, wasm } => {
let module = match Module::new(store.as_ref().unwrap(), &wasm.wasm) {
let module = HostRef::new(match Module::new(store.as_ref().unwrap(), &wasm.wasm) {
Ok(m) => m,
Err(_) => continue,
};
});
let old = modules.insert(id, module);
assert!(old.is_none());
}
@@ -131,7 +135,9 @@ pub fn make_api_calls(api: crate::generators::api::ApiCalls) {
None => continue,
};
let imports = match dummy_imports(store.as_ref().unwrap(), module.imports()) {
let imports = {
let module = module.borrow();
match dummy_imports(store.as_ref().unwrap(), module.imports()) {
Ok(imps) => imps,
Err(_) => {
// There are some value types that we can't synthesize a
@@ -139,6 +145,7 @@ pub fn make_api_calls(api: crate::generators::api::ApiCalls) {
// import things of these types we skip instantiation.
continue;
}
}
};
// Don't unwrap this: there can be instantiation-/link-time errors that

5
crates/jit/src/code_memory.rs
View File

@@ -14,11 +14,6 @@ pub struct CodeMemory {
published: usize,
}
fn _assert() {
fn _assert_send_sync<T: Send + Sync>() {}
_assert_send_sync::<CodeMemory>();
}
impl CodeMemory {
/// Create a new `CodeMemory` instance.
pub fn new() -> Self {

2
crates/misc/py/src/instance.rs
View File

@@ -21,7 +21,7 @@ impl Instance {
let py = gil.python();
let exports = PyDict::new(py);
let module = self.instance.borrow().module().clone();
for (i, e) in module.exports().iter().enumerate() {
for (i, e) in module.borrow().exports().iter().enumerate() {
match e.ty() {
wasmtime::ExternType::Func(ft) => {
let mut args_types = Vec::new();

4
crates/misc/py/src/lib.rs
View File

@@ -84,7 +84,7 @@ pub fn instantiate(
let engine = wasmtime::Engine::new(&wasmtime::Config::new().wasm_multi_value(true));
let store = wasmtime::Store::new(&engine);
let module = wasmtime::Module::new(&store, wasm_data).map_err(err2py)?;
let module = wasmtime::HostRef::new(wasmtime::Module::new(&store, wasm_data).map_err(err2py)?);
let data = Rc::new(ModuleData::new(wasm_data).map_err(err2py)?);
@@ -99,7 +99,7 @@ pub fn instantiate(
};
let mut imports: Vec<wasmtime::Extern> = Vec::new();
for i in module.imports() {
for i in module.borrow().imports() {
let module_name = i.module();
if let Some(m) = import_obj.get_item(module_name) {
let e = find_export_in(m, &store, i.name())?;

2
crates/misc/py/src/module.rs
View File

@@ -4,5 +4,5 @@ use pyo3::prelude::*;
#[pyclass]
pub struct Module {
pub module: wasmtime::Module,
pub module: wasmtime::HostRef<wasmtime::Module>,
}

4
crates/misc/rust/macro/src/lib.rs
View File

@@ -57,13 +57,13 @@ fn generate_load(item: &syn::ItemTrait) -> syn::Result<TokenStream> {
let data = #root::wasmtime_interface_types::ModuleData::new(&bytes)?;
let module = Module::new(&store, &bytes)?;
let module = HostRef::new(Module::new(&store, &bytes)?);
let mut imports: Vec<Extern> = Vec::new();
if let Some(module_name) = data.find_wasi_module_name() {
let wasi_instance = #root::wasmtime_wasi::create_wasi_instance(&store, &[], &[], &[])
.map_err(|e| format_err!("wasm instantiation error: {:?}", e))?;
for i in module.imports().iter() {
for i in module.borrow().imports().iter() {
if i.module() != module_name {
bail!("unknown import module {}", i.module());
}

42
crates/runtime/src/mmap.rs
View File

@@ -1,8 +1,11 @@
//! Low-level abstraction for allocating and managing zero-filled pages
//! of memory.
#[cfg(not(target_os = "windows"))]
use libc;
use more_asserts::assert_le;
use more_asserts::assert_lt;
use region;
use std::io;
use std::ptr;
use std::slice;
@@ -16,7 +19,7 @@ fn round_up_to_page_size(size: usize, page_size: usize) -> usize {
/// and initially-zeroed memory and a length.
#[derive(Debug)]
pub struct Mmap {
offset: usize,
ptr: *mut u8,
len: usize,
}
@@ -26,8 +29,10 @@ impl Mmap {
// Rust's slices require non-null pointers, even when empty. `Vec`
// contains code to create a non-null dangling pointer value when
// constructed empty, so we reuse that here.
let empty = Vec::<u8>::new();
Self { offset: empty.as_ptr() as usize, len: 0 }
Self {
ptr: Vec::new().as_mut_ptr(),
len: 0,
}
}
/// Create a new `Mmap` pointing to at least `size` bytes of page-aligned accessible memory.
@@ -73,7 +78,7 @@ impl Mmap {
}
Self {
offset: ptr as usize,
ptr: ptr as *mut u8,
len: mapping_size,
}
} else {
@@ -93,7 +98,7 @@ impl Mmap {
}
let mut result = Self {
offset: ptr as usize,
ptr: ptr as *mut u8,
len: mapping_size,
};
@@ -137,7 +142,7 @@ impl Mmap {
}
Self {
offset: ptr as usize,
ptr: ptr as *mut u8,
len: mapping_size,
}
} else {
@@ -149,7 +154,7 @@ impl Mmap {
}
let mut result = Self {
offset: ptr as usize,
ptr: ptr as *mut u8,
len: mapping_size,
};
@@ -174,8 +179,7 @@ impl Mmap {
assert_lt!(start, self.len - len);
// Commit the accessible size.
let ptr = self.offset as *const u8;
unsafe { region::protect(ptr.add(start), len, region::Protection::ReadWrite) }
unsafe { region::protect(self.ptr.add(start), len, region::Protection::ReadWrite) }
.map_err(|e| e.to_string())
}
@@ -194,10 +198,9 @@ impl Mmap {
assert_lt!(start, self.len - len);
// Commit the accessible size.
let ptr = self.offset as *const u8;
if unsafe {
VirtualAlloc(
ptr.add(start) as *mut c_void,
self.ptr.add(start) as *mut c_void,
len,
MEM_COMMIT,
PAGE_READWRITE,
@@ -213,22 +216,22 @@ impl Mmap {
/// Return the allocated memory as a slice of u8.
pub fn as_slice(&self) -> &[u8] {
unsafe { slice::from_raw_parts(self.offset as *const u8, self.len) }
unsafe { slice::from_raw_parts(self.ptr, self.len) }
}
/// Return the allocated memory as a mutable slice of u8.
pub fn as_mut_slice(&mut self) -> &mut [u8] {
unsafe { slice::from_raw_parts_mut(self.offset as *mut u8, self.len) }
unsafe { slice::from_raw_parts_mut(self.ptr, self.len) }
}
/// Return the allocated memory as a pointer to u8.
pub fn as_ptr(&self) -> *const u8 {
self.offset as *const u8
self.ptr
}
/// Return the allocated memory as a mutable pointer to u8.
pub fn as_mut_ptr(&mut self) -> *mut u8 {
self.offset as *mut u8
self.ptr
}
/// Return the length of the allocated memory.
@@ -246,7 +249,7 @@ impl Drop for Mmap {
#[cfg(not(target_os = "windows"))]
fn drop(&mut self) {
if self.len != 0 {
let r = unsafe { libc::munmap(self.offset as *mut libc::c_void, self.len) };
let r = unsafe { libc::munmap(self.ptr as *mut libc::c_void, self.len) };
assert_eq!(r, 0, "munmap failed: {}", io::Error::last_os_error());
}
}
@@ -257,17 +260,12 @@ impl Drop for Mmap {
use winapi::ctypes::c_void;
use winapi::um::memoryapi::VirtualFree;
use winapi::um::winnt::MEM_RELEASE;
let r = unsafe { VirtualFree(self.offset as *mut c_void, 0, MEM_RELEASE) };
let r = unsafe { VirtualFree(self.ptr as *mut c_void, 0, MEM_RELEASE) };
assert_ne!(r, 0);
}
}
}
fn _assert() {
fn _assert_send_sync<T: Send + Sync>() {}
_assert_send_sync::<Mmap>();
}
#[cfg(test)]
mod tests {
use super::*;

3
crates/test-programs/tests/wasm_tests/runtime.rs
View File

@@ -43,8 +43,9 @@ pub fn instantiate(data: &[u8], bin_name: &str, workspace: Option<&Path>) -> any
.context("failed to instantiate wasi")?,
);
let module = Module::new(&store, &data).context("failed to create wasm module")?;
let module = HostRef::new(Module::new(&store, &data).context("failed to create wasm module")?);
let imports = module
.borrow()
.imports()
.iter()
.map(|i| {

4
crates/wast/src/wast.rs
View File

@@ -65,9 +65,9 @@ impl WastContext {
}
fn instantiate(&self, module: &[u8]) -> Result<Outcome<HostRef<Instance>>> {
let module = Module::new(&self.store, module)?;
let module = HostRef::new(Module::new(&self.store, module)?);
let mut imports = Vec::new();
for import in module.imports() {
for import in module.borrow().imports() {
if import.module() == "spectest" {
let spectest = self
.spectest

6
src/commands/run.rs
View File

@@ -234,14 +234,15 @@ impl RunCommand {
store: &Store,
module_registry: &HashMap<String, HostRef<Instance>>,
path: &Path,
) -> Result<(HostRef<Instance>, Module, Vec<u8>)> {
) -> Result<(HostRef<Instance>, HostRef<Module>, Vec<u8>)> {
// Read the wasm module binary either as `*.wat` or a raw binary
let data = wat::parse_file(path)?;
let module = Module::new(store, &data)?;
let module = HostRef::new(Module::new(store, &data)?);
// Resolve import using module_registry.
let imports = module
.borrow()
.imports()
.iter()
.map(|i| {
@@ -284,6 +285,7 @@ impl RunCommand {
let data = ModuleData::new(&data)?;
self.invoke_export(instance, &data, name)?;
} else if module
.borrow()
.exports()
.iter()
.any(|export| export.name().is_empty())