internal Instance(Interop.LinkerHandle linker, Module module)
{
Module = module;
unsafe
{
var error = Interop.wasmtime_linker_instantiate(linker, module.Handle, out var handle, out var trap);
Handle = handle;
if (error != IntPtr.Zero)
{
throw WasmtimeException.FromOwnedError(error);
}
if (trap != IntPtr.Zero)
{
throw TrapException.FromOwnedTrap(trap);
}
}
if (Handle.IsInvalid)
{
throw new WasmtimeException("Failed to create Wasmtime instance.");
}
Interop.wasm_instance_exports(Handle, out _externs);
Externs = new Wasmtime.Externs.Externs(Module.Exports, _externs);
_functions = Externs.Functions.ToDictionary(f => f.Name);
_globals = Externs.Globals.ToDictionary(g => g.Name);
}
internal Instance(Module module, IHost host)
{
Host = host;
Module = module;
//Save the bindings to root the objects.
//Otherwise the GC may collect the delegates from ExternFunction for example.
_bindings = host.GetImportBindings(module);
var handles = _bindings.Select(b => b.Bind(module.Store, host)).ToList();
unsafe
{
Handle = Interop.wasm_instance_new(
Module.Store.Handle,
Module.Handle,
handles.Select(h => ToExtern(h)).ToArray(),
out var trap);
if (trap != IntPtr.Zero)
{
throw TrapException.FromOwnedTrap(trap);
}
}
if (Handle.IsInvalid)
{
throw new WasmtimeException($"Failed to instantiate module '{module.Name}'.");
}
// Dispose of all function handles (not needed at runtime)
foreach (var h in handles.Where(h => h is Interop.FunctionHandle))
{
h.Dispose();
}
Interop.wasm_instance_exports(Handle, out _externs);
Externs = new Wasmtime.Externs.Externs(Module.Exports, _externs);
_functions = Externs.Functions.ToDictionary(f => f.Name);
_globals = Externs.Globals.ToDictionary(g => g.Name);
}
internal Instance(Module module, Wasi wasi = null, IHost host = null)
{
Host = host;
Module = module;
// Save the bindings to root the objects.
// Otherwise the GC may collect the callback delegates from FunctionHandles for example.
_bindings = Binding.GetImportBindings(module, wasi, host)
.Select(b => b.Bind(module.Store, host))
.ToArray();
unsafe
{
Handle = Interop.wasm_instance_new(
Module.Store.Handle,
Module.Handle,
_bindings.Select(h => ToExtern(h)).ToArray(),
out var trap);
if (trap != IntPtr.Zero)
{
throw TrapException.FromOwnedTrap(trap);
}
}
if (Handle.IsInvalid)
{
throw new WasmtimeException($"Failed to instantiate module '{module.Name}'.");
}
Interop.wasm_instance_exports(Handle, out _externs);
Externs = new Wasmtime.Externs.Externs(Module.Exports, _externs);
_functions = Externs.Functions.ToDictionary(f => f.Name);
_globals = Externs.Globals.ToDictionary(g => g.Name);
}
