linking

Cargo.lock

@@ -806,6 +806,10 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "ipfs_node"
+version = "0.1.0"
+
 [[package]]
 name = "ipfs_rpc"
 version = "0.1.0"
@@ -968,6 +972,15 @@ dependencies = [
  "ws2_32-sys",
 ]
 
+[[package]]
+name = "multimap"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8883adfde9756c1d30b0f519c9b8c502a94b41ac62f696453c37c7fc0a958ce"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "native-tls"
 version = "0.2.4"
@@ -2244,6 +2257,7 @@ dependencies = [
 name = "wit_fce"
 version = "0.1.0"
 dependencies = [
+ "multimap",
  "wasmer-interface-types",
  "wasmer-runtime 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-runtime-core 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

@@ -4,5 +4,6 @@ members = [
     "wit_fce",
     "wit_embedder",
     "wit_fce/examples/export_test",
+    "wit_fce/examples/ipfs_node",
     "wit_fce/examples/ipfs_rpc",
 ]

wit_fce/Cargo.toml

@@ -6,5 +6,14 @@ edition = "2018"
 
 [dependencies]
 wasmer-runtime = "0.17.0"
-wasmer-runtime-core = "0.17.0"
+wasmer-runtime-core = { version = "0.17.0", features = ["dynamicfunc-fat-closures"] }
 wasmer-interface-types = { git = "http://github.com/fluencelabs/interface-types" }
+multimap = "0.8.1"
+
+[profile.release]
+opt-level = 3
+debug = false
+lto = true
+debug-assertions = false
+overflow-checks = false
+panic = "abort"

wit_fce/examples/export_test/wit

@@ -45,5 +45,5 @@
 )
 
 ;; Implementations
-(@interface implement (func 0) (func 2))
+(@interface implement (func 2) (func 2))
-(@interface implement (func 1) (func 3))
+(@interface implement (func 3) (func 3))

wit_fce/examples/ipfs_node/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "ipfs_node"
+version = "0.1.0"
+authors = ["Fluence Labs"]
+edition = "2018"
+
+[lib]
+name = "ipfs_node"
+path = "src/lib.rs"
+crate-type = ["cdylib"]

wit_fce/examples/ipfs_node/src/lib.rs

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+mod mem;
+mod result;
+
+use crate::result::{RESULT_PTR, RESULT_SIZE};
+
+#[no_mangle]
+pub unsafe fn put(file_content_ptr: *mut u8, file_content_size: usize) {
+    let file_content = String::from_raw_parts(
+        file_content_ptr,
+        file_content_size,
+        file_content_size
+    );
+
+    let msg = format!("from Wasm node: file content is {}\n", file_content);
+    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+
+    let cmd = format!("put {}", file_content);
+    ipfs(file_content.as_ptr() as _, file_content.len() as _);
+}
+
+#[no_mangle]
+pub unsafe fn get(hash_ptr: *mut u8, hash_size: usize, t: i32) {
+    let hash = String::from_raw_parts(
+        hash_ptr,
+        hash_size,
+        hash_size
+    );
+
+    let msg = format!("from Wasm node: file content is {}\n", hash);
+    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+
+    let cmd = format!("get {}", hash);
+    ipfs(cmd.as_ptr() as _, cmd.len() as _);
+}
+
+#[link(wasm_import_module = "logger")]
+extern "C" {
+    /// Writes a byte string of size bytes that starts from ptr to a logger.
+    fn log_utf8_string(ptr: i32, size: i32);
+}
+
+#[link(wasm_import_module = "host")]
+extern "C" {
+    /// Put a file to ipfs, returns ipfs hash of the file.
+    fn ipfs(ptr: i32, size: i32);
+}

wit_fce/examples/ipfs_node/src/mem.rs

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+use std::alloc::{alloc as global_alloc, dealloc as global_dealloc, Layout};
+use std::ptr::NonNull;
+
+/// Allocates memory area of specified size and returns its address.
+#[no_mangle]
+pub unsafe fn allocate(size: usize) -> NonNull<u8> {
+    let layout: Layout = Layout::from_size_align(size, std::mem::align_of::<u8>()).unwrap();
+    NonNull::new_unchecked(global_alloc(layout))
+}
+
+/// Deallocates memory area for provided memory pointer and size.
+#[no_mangle]
+pub unsafe fn deallocate(ptr: NonNull<u8>, size: usize) {
+    let layout = Layout::from_size_align(size, std::mem::align_of::<u8>()).unwrap();
+    global_dealloc(ptr.as_ptr(), layout);
+}

wit_fce/examples/ipfs_node/src/result.rs

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+use std::sync::atomic::AtomicUsize;
+
+pub static mut RESULT_PTR: AtomicUsize = AtomicUsize::new(0);
+pub static mut RESULT_SIZE: AtomicUsize = AtomicUsize::new(0);
+
+#[no_mangle]
+pub unsafe fn get_result_ptr() -> usize {
+    *RESULT_PTR.get_mut()
+}
+
+#[no_mangle]
+pub unsafe fn get_result_size() -> usize {
+    *RESULT_SIZE.get_mut()
+}
+
+#[no_mangle]
+pub unsafe fn set_result_ptr(ptr: usize) {
+    *RESULT_PTR.get_mut() = ptr;
+}
+
+#[no_mangle]
+pub unsafe fn set_result_size(size: usize) {
+    *RESULT_SIZE.get_mut() = size;
+}

wit_fce/examples/ipfs_node/wit

@@ -0,0 +1,44 @@
+;; allocate function type
+(@interface type (func (param i32) (result i32)))       ;; 0
+
+;; deallocate function
+(@interface type (func (param i32 i32)))                ;; 1
+
+;; invoke function
+(@interface type (func (param string) (result string))) ;; 2
+
+;; result extractor functions
+(@interface type (func (result i32)))                   ;; 3
+
+;; result setter functions
+(@interface type (func (param string)))                    ;; 4
+
+;; import ipfs put/get function
+(@interface type (func (param string) (result string)))                ;; 5
+
+;; import ipfs put/get function
+(@interface type (func (param string) (result string))) ;; 6
+
+;; import ipfs put/get function
+(@interface type (func (param string) (result string))) ;; 7
+
+(@interface export "allocate" (func  0))        ;; 0
+(@interface export "deallocate" (func 1))       ;; 1
+(@interface export "get_result_size" (func 3))  ;; 3
+(@interface export "get_result_ptr" (func 3))   ;; 4
+(@interface export "set_result_size" (func 4))  ;; 5
+(@interface export "set_result_ptr" (func 4))   ;; 6
+
+(@interface export "put" (func 5))              ;; 8
+(@interface export "get" (func 5))              ;; 7
+
+(@interface func (type 6)
+    arg.get 0
+    string.lower_memory
+    call-core 9  ;; call node.get
+    call-core 5  ;; call set_result_size
+    call-core 6  ;; call set_result_ptr
+)
+
+;; Implementations
+(@interface implement (func 5) (func 6))

wit_fce/examples/ipfs_rpc/src/lib.rs

@@ -21,14 +21,26 @@ use crate::result::{RESULT_PTR, RESULT_SIZE};
 
 #[no_mangle]
 pub unsafe fn invoke(file_content_ptr: *mut u8, file_content_size: usize) {
+    let file_content = String::from_raw_parts(
+        file_content_ptr,
+        file_content_size,
+        file_content_size,
+    );
+    let msg = format!("from Wasm rpc: file_content is {}\n", file_content);
+    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+
     put(file_content_ptr as _, file_content_size as _);
+
+    /*
     let hash = String::from_raw_parts(
         *RESULT_PTR.get_mut(),
         *RESULT_SIZE.get_mut(),
         *RESULT_SIZE.get_mut(),
     );
+    let msg = format!("from Wasm rpc: hash is {}\n", hash);
 
-    log_utf8_string(hash.as_ptr() as _, hash.len() as _);
+    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+    */
 }
 
 #[link(wasm_import_module = "logger")]

wit_fce/examples/ipfs_rpc/src/result.rs

@@ -36,6 +36,6 @@ pub unsafe fn set_result_ptr(ptr: usize) {
 }
 
 #[no_mangle]
-pub unsafe fn set_result_size(ptr: usize) {
+pub unsafe fn set_result_size(size: usize) {
     *RESULT_SIZE.get_mut() = size;
 }

wit_fce/examples/ipfs_rpc/wit

@@ -1,31 +1,43 @@
 ;; allocate function type
-(@interface type (func (param i32) (result i32)))
+(@interface type (func (param i32) (result i32)))       ;; 0
 
 ;; deallocate function
-(@interface type (func (param i32 i32)))
+(@interface type (func (param i32 i32)))                ;; 1
 
 ;; invoke function
-(@interface type (func (param string) (result string)))
+(@interface type (func (param string) (result string))) ;; 2
 
 ;; result extractor functions
-(@interface type (func (result i32)))
+(@interface type (func (result i32)))                   ;; 3
 
 ;; result setter functions
-(@interface type (func (param i32)))
+(@interface type (func (param i32)))                    ;; 4
 
 ;; import ipfs put/get function
-(@interface type (func (param string) (param string)))
+(@interface type (func (param i32 i32)))                ;; 5
 
-(@interface export "allocate" (func  0))
+;; import ipfs put/get function
-(@interface export "deallocate" (func 1))
+(@interface type (func (param string) (result string))) ;; 6
-(@interface export "invoke" (func 2))
-(@interface export "get_result_size" (func 3))
-(@interface export "get_result_ptr" (func 3))
-(@interface export "set_result_size" (func 4))
-(@interface export "set_result_ptr" (func 4))
 
-(@interface import "node" "get" (func 5))
+;; import ipfs put/get function
-(@interface import "node" "put" (func 5))
+(@interface type (func (param string) (result string))) ;; 7
+
+;; import ipfs put/get function
+(@interface type (func (param i64 i32) (result i64 i32))) ;; 8
+
+(@interface export "allocate" (func  0))               ;; 0
+(@interface export "deallocate" (func 1))              ;; 1
+(@interface export "invoke" (func 2))                  ;; 2
+(@interface export "get_result_size" (func 3))         ;; 3
+(@interface export "get_result_ptr" (func 3))          ;; 4
+(@interface export "set_result_size" (func 4))         ;; 5
+(@interface export "set_result_ptr" (func 4))          ;; 6
+
+(@interface import "node" "get" (func (type 5)))
+(@interface import "node" "put" (func (type 5)))
+
+(@interface import "node" "get" (func (type 7)))       ;; 7
+(@interface import "node" "put" (func (type 8)))       ;; 8
 
 (@interface func (type 2)
     arg.get 0
@@ -33,7 +45,7 @@
     call-core 0             ;; call allocate
     arg.get 0
     string.lower_memory
-    call-core 2 ;; call greeting
+    call-core 2             ;; call invoke
     call-core 3             ;; call get_result_size
     call-core 4             ;; call get_result_ptr
     string.lift_memory
@@ -42,5 +54,16 @@
     call-core 1             ;; call deallocate
 )
 
+(@interface func (type 5)
+    arg.get 0
+    arg.get 1
+    string.lift_memory
+    call-core 7             ;; call node.get that returns string
+    string.lower_memory
+    call-core 5             ;; call set_result_size
+    call-core 6             ;; call set_result_ptr
+)
+
 ;; Implementations
-(@interface implement (func 0) (func 2))
+(@interface implement (func 2) (func 2))
+(@interface implement (func 5) (func 5))

wit_fce/src/instance/errors.rs

@@ -45,7 +45,7 @@ pub enum WITFCEError {
     NonUniqueModuleName,
 
     /// Returns when there is no module with such name.
-    NoSuchFunction,
+    NoSuchFunction(String),
 
     /// Returns when there is no module with such name.
     NoSuchModule,
@@ -79,8 +79,13 @@ impl std::fmt::Display for WITFCEError {
             WITFCEError::PrepareError(msg) => {
                 write!(f, "Prepare error: {}, probably module is mailformed", msg)
             }
-            WITFCEError::NonUniqueModuleName => write!(f, "FCE already has module with such name"),
+            WITFCEError::NonUniqueModuleName => {
-            WITFCEError::NoSuchModule => write!(f, "FCE doesn't have a module with such name"),
+                write!(f, "FCE already has module with such a name")
+            }
+            WITFCEError::NoSuchFunction(msg) => {
+                write!(f, "FCE doesn't have a function with such a name: {}", msg)
+            }
+            WITFCEError::NoSuchModule => write!(f, "FCE doesn't have a module with such a name"),
             WITFCEError::ModuleInUse => {
                 write!(f, "Module is used by other modules and couldn't be deleted")
             }

wit_fce/src/instance/locals_imports.rs

@@ -1,86 +0,0 @@
-/*
- * Copyright 2020 Fluence Labs Limited
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-use crate::instance::errors::WITFCEError;
-use wasmer_interface_types::interpreter::wasm;
-use wasmer_interface_types::{types::InterfaceType, values::InterfaceValue};
-use wasmer_runtime_core::instance::DynFunc;
-use wasmer_runtime_core::types::Value;
-
-pub(crate) struct WITLocalImport {
-    inner: DynFunc<'static>,
-    inputs: Vec<InterfaceType>,
-    outputs: Vec<InterfaceType>,
-}
-
-impl WITLocalImport {
-    pub fn new(dyn_func: DynFunc<'static>) -> Result<Self, WITFCEError> {
-        use super::wtype_to_itype;
-
-        let signature = dyn_func.signature();
-        let inputs = signature
-            .params()
-            .iter()
-            .map(wtype_to_itype)
-            .collect::<Vec<_>>();
-        let outputs = signature
-            .returns()
-            .iter()
-            .map(wtype_to_itype)
-            .collect::<Vec<_>>();
-
-        Ok(Self {
-            inner: dyn_func,
-            inputs,
-            outputs,
-        })
-    }
-}
-
-impl std::ops::Deref for WITLocalImport {
-    type Target = DynFunc<'static>;
-
-    fn deref(&self) -> &Self::Target {
-        &self.inner
-    }
-}
-
-impl wasm::structures::LocalImport for WITLocalImport {
-    fn inputs_cardinality(&self) -> usize {
-        self.inputs.len()
-    }
-
-    fn outputs_cardinality(&self) -> usize {
-        self.outputs.len()
-    }
-
-    fn inputs(&self) -> &[InterfaceType] {
-        &self.inputs
-    }
-
-    fn outputs(&self) -> &[InterfaceType] {
-        &self.outputs
-    }
-
-    fn call(&self, arguments: &[InterfaceValue]) -> Result<Vec<InterfaceValue>, ()> {
-        use super::{ival_to_wval, wval_to_ival};
-
-        self.inner
-            .call(&arguments.iter().map(ival_to_wval).collect::<Vec<Value>>())
-            .map(|results| results.iter().map(wval_to_ival).collect())
-            .map_err(|_| ())
-    }
-}

wit_fce/src/instance/memory.rs

@@ -26,6 +26,7 @@ impl<'a> std::ops::Deref for WITMemoryView<'a> {
     }
 }
 
+#[derive(Clone)]
 pub struct WITMemory(pub Memory);
 impl std::ops::Deref for WITMemory {
     type Target = Memory;

wit_fce/src/instance/mod.rs

@@ -16,8 +16,8 @@
 
 pub mod errors;
 pub mod exports;
-pub mod locals_imports;
 pub mod memory;
+pub mod wit_function;
 pub mod wit_instance;
 pub mod wit_module;
 
@@ -35,6 +35,16 @@ pub fn wtype_to_itype(ty: &WType) -> IType {
     }
 }
 
+pub fn itype_to_wtype(ty: &IType) -> WType {
+    match ty {
+        IType::I32 => WType::I32,
+        IType::I64 => WType::I64,
+        IType::F32 => WType::F32,
+        IType::F64 => WType::F64,
+        _ => unimplemented!(),
+    }
+}
+
 pub fn ival_to_wval(value: &IValue) -> WValue {
     match value {
         IValue::I32(v) => WValue::I32(*v),

wit_fce/src/instance/wit_function.rs

@@ -0,0 +1,153 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use crate::instance::errors::WITFCEError;
+use crate::instance::wit_module::WITModule;
+use std::sync::Arc;
+use wasmer_interface_types::interpreter::wasm;
+use wasmer_interface_types::{types::InterfaceType, values::InterfaceValue};
+use wasmer_runtime_core::instance::DynFunc;
+use wasmer_runtime_core::types::Value;
+
+#[derive(Clone)]
+enum WITFunctionInner {
+    Export {
+        func: Arc<DynFunc<'static>>,
+        inputs: Vec<InterfaceType>,
+        outputs: Vec<InterfaceType>,
+    },
+    Import {
+        wit_module: Arc<WITModule>,
+        func_name: String,
+        inputs: Vec<InterfaceType>,
+        outputs: Vec<InterfaceType>,
+    },
+}
+
+#[derive(Clone)]
+pub(crate) struct WITFunction {
+    inner: WITFunctionInner,
+}
+
+impl WITFunction {
+    pub fn from_export(dyn_func: DynFunc<'static>) -> Result<Self, WITFCEError> {
+        use super::wtype_to_itype;
+
+        let signature = dyn_func.signature();
+        let inputs = signature
+            .params()
+            .iter()
+            .map(wtype_to_itype)
+            .collect::<Vec<_>>();
+        let outputs = signature
+            .returns()
+            .iter()
+            .map(wtype_to_itype)
+            .collect::<Vec<_>>();
+
+        let inner = WITFunctionInner::Export {
+            func: Arc::new(dyn_func),
+            inputs,
+            outputs,
+        };
+
+        Ok(Self { inner })
+    }
+
+    pub fn from_import(wit_module: Arc<WITModule>, func_name: String) -> Result<Self, WITFCEError> {
+        let (inputs, outputs) = wit_module.as_ref().get_func_signature(&func_name)?;
+        println!("from_import: {:?}", inputs);
+
+        let inner = WITFunctionInner::Import {
+            wit_module,
+            func_name,
+            inputs,
+            outputs,
+        };
+
+        Ok(Self { inner })
+    }
+}
+
+/*
+impl std::ops::Deref for WITFuncs {
+    type Target = DynFunc<'static>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.inner
+    }
+}
+ */
+
+impl wasm::structures::LocalImport for WITFunction {
+    fn inputs_cardinality(&self) -> usize {
+        match &self.inner {
+            WITFunctionInner::Export { ref inputs, .. } => inputs.len(),
+            WITFunctionInner::Import { ref inputs, .. } => inputs.len(),
+        }
+    }
+
+    fn outputs_cardinality(&self) -> usize {
+        match &self.inner {
+            WITFunctionInner::Export { ref outputs, .. } => outputs.len(),
+            WITFunctionInner::Import { ref outputs, .. } => outputs.len(),
+        }
+    }
+
+    fn inputs(&self) -> &[InterfaceType] {
+        match &self.inner {
+            WITFunctionInner::Export { ref inputs, .. } => inputs,
+            WITFunctionInner::Import { ref inputs, .. } => inputs,
+        }
+    }
+
+    fn outputs(&self) -> &[InterfaceType] {
+        match &self.inner {
+            WITFunctionInner::Export { ref outputs, .. } => outputs,
+            WITFunctionInner::Import { ref outputs, .. } => outputs,
+        }
+    }
+
+    fn call(&self, arguments: &[InterfaceValue]) -> Result<Vec<InterfaceValue>, ()> {
+        use super::{ival_to_wval, wval_to_ival};
+
+        match &self.inner {
+            WITFunctionInner::Export { func, .. } => {
+                println!("calling with {:?}", arguments);
+                func.as_ref()
+                    .call(&arguments.iter().map(ival_to_wval).collect::<Vec<Value>>())
+                    .map(|results| results.iter().map(wval_to_ival).collect())
+                    .map_err(|_| ())
+            }
+            WITFunctionInner::Import {
+                wit_module,
+                func_name,
+                ..
+            } => {
+                println!("calling {} with {:?}", func_name, arguments);
+                let mut tt = wit_module.clone();
+                unsafe {
+                    let result = Arc::get_mut_unchecked(&mut tt)
+                        .call(func_name, arguments)
+                        .map_err(|_| ());
+
+                    println!("result is {:?}", result);
+                    result
+                }
+            }
+        }
+    }
+}

wit_fce/src/instance/wit_instance.rs

@@ -16,20 +16,26 @@
 
 use crate::instance::errors::WITFCEError;
 use crate::instance::exports::WITExport;
-use crate::instance::locals_imports::WITLocalImport;
 use crate::instance::memory::{WITMemory, WITMemoryView};
+use crate::instance::wit_function::WITFunction;
 
 use wasmer_interface_types::interpreter::wasm;
 use wasmer_runtime_core::Instance as WasmerInstance;
 
+use crate::instance::wit_module::WITModule;
 use std::collections::HashMap;
+use std::sync::Arc;
 use wasmer_interface_types::ast::Interfaces;
 use wasmer_interface_types::ast::Type;
-use wasmer_interface_types::interpreter::wasm::structures::{LocalImportIndex, TypedIndex};
+use wasmer_interface_types::interpreter::wasm::structures::{
+    LocalImport, LocalImportIndex, TypedIndex,
+};
+use wasmer_interface_types::types::InterfaceType;
 
+#[derive(Clone)]
 pub struct WITInstance {
-    // represent all import and export functions
+    // represent all import and export functions that could be called from WIT context
-    funcs: HashMap<usize, WITLocalImport>,
+    funcs: HashMap<usize, WITFunction>,
     memories: Vec<WITMemory>,
 }
 
@@ -37,17 +43,37 @@ impl WITInstance {
     pub fn new(
         wasmer_instance: &WasmerInstance,
         interfaces: &Interfaces,
+        modules: &HashMap<String, Arc<WITModule>>,
     ) -> Result<Self, WITFCEError> {
-        let funcs = Self::extract_funcs(&wasmer_instance, interfaces)?;
+        let mut exports = Self::extract_exports(&wasmer_instance, interfaces)?;
+        println!("exports count {}", exports.len());
+        let imports = Self::extract_imports(modules, interfaces, exports.len())?;
+        println!("imports count {}", imports.len());
         let memories = Self::extract_memories(&wasmer_instance);
 
+        exports.extend(imports);
+        let funcs = exports;
+
         Ok(Self { funcs, memories })
     }
 
-    fn extract_funcs(
+    pub fn get_func_signature(
+        &self,
+        func_idx: usize,
+    ) -> Result<(Vec<InterfaceType>, Vec<InterfaceType>), WITFCEError> {
+        match self.funcs.get(&func_idx) {
+            Some(func) => Ok((func.inputs().to_owned(), func.outputs().to_owned())),
+            None => Err(WITFCEError::NoSuchFunction(format!(
+                "function with idx = {} hasn't been found during its signature looking up",
+                func_idx
+            ))),
+        }
+    }
+
+    fn extract_exports(
         wasmer_instance: &WasmerInstance,
         interfaces: &Interfaces,
-    ) -> Result<HashMap<usize, WITLocalImport>, WITFCEError> {
+    ) -> Result<HashMap<usize, WITFunction>, WITFCEError> {
         use wasmer_runtime_core::DynFunc;
         let module_exports = &wasmer_instance.exports;
 
@@ -62,12 +88,58 @@ impl WITInstance {
                     // here it is safe because dyn func is never lives WITInstance
                     let export_func =
                         std::mem::transmute::<DynFunc<'_>, DynFunc<'static>>(export_func);
-                    Ok((export_id, WITLocalImport::new(export_func)?))
+                    let tt = WITFunction::from_export(export_func)?;
+                    println!(
+                        "{}, {} - {:?}",
+                        export_id,
+                        export.name,
+                        tt.inputs()
+                    );
+                    Ok((export_id, tt))
                 }
             })
             .collect()
     }
 
+    /// Extracts only those imports that don't have implementations.
+    fn extract_imports(
+        modules: &HashMap<String, Arc<WITModule>>,
+        interfaces: &Interfaces,
+        start_index: usize,
+    ) -> Result<HashMap<usize, WITFunction>, WITFCEError> {
+        // uses to filter import functions that have an adapter implementation
+        let core_to_adapter = interfaces
+            .implementations
+            .iter()
+            .map(|i| (i.core_function_type, i.adapter_function_type))
+            .collect::<HashMap<_, _>>();
+
+        let mut non_wit_callable_imports = HashMap::new();
+
+        for import in interfaces.imports.iter() {
+            if let Some(_) = core_to_adapter.get(&import.function_type) {
+                continue;
+            }
+
+            match modules.get(import.namespace) {
+                Some(module) => {
+                    let func = WITFunction::from_import(module.clone(), import.name.to_string())?;
+                    println!(
+                        "{}, {} - {:?}",
+                        start_index + non_wit_callable_imports.len(),
+                        import.name,
+                        func.inputs()
+                    );
+                    non_wit_callable_imports
+                        .insert(start_index + non_wit_callable_imports.len() as usize, func);
+                }
+                None => return Err(WITFCEError::NoSuchModule),
+            }
+        }
+
+        Ok(non_wit_callable_imports)
+    }
+
     fn extract_memories(wasmer_instance: &WasmerInstance) -> Vec<WITMemory> {
         use wasmer_runtime_core::export::Export::Memory;
 
@@ -90,7 +162,7 @@ impl WITInstance {
     }
 }
 
-impl<'instance> wasm::structures::Instance<WITExport, WITLocalImport, WITMemory, WITMemoryView<'_>>
+impl<'instance> wasm::structures::Instance<WITExport, WITFunction, WITMemory, WITMemoryView<'_>>
     for WITInstance
 {
     fn export(&self, _export_name: &str) -> Option<&WITExport> {
@@ -101,7 +173,7 @@ impl<'instance> wasm::structures::Instance<WITExport, WITLocalImport, WITMemory,
     fn local_or_import<I: TypedIndex + LocalImportIndex>(
         &mut self,
         index: I,
-    ) -> Option<&WITLocalImport> {
+    ) -> Option<&WITFunction> {
         self.funcs.get(&index.index())
     }
 

wit_fce/src/instance/wit_module.rs

@@ -16,41 +16,47 @@
 
 use crate::instance::errors::WITFCEError;
 use crate::instance::exports::WITExport;
-use crate::instance::locals_imports::WITLocalImport;
 use crate::instance::memory::{WITMemory, WITMemoryView};
+use crate::instance::wit_function::WITFunction;
 use crate::instance::wit_instance::WITInstance;
 
 use wasmer_interface_types as wit;
+use wasmer_interface_types::ast::Interfaces;
 use wasmer_interface_types::interpreter::Interpreter;
 use wasmer_interface_types::values::InterfaceValue;
 use wasmer_runtime::{compile, ImportObject};
 use wasmer_runtime_core::Instance as WasmerInstance;
 
+use multimap::MultiMap;
 use std::collections::HashMap;
 use std::convert::TryInto;
+use std::mem::MaybeUninit;
+use std::sync::Arc;
 use wasmer_interface_types::interpreter::stack::Stackable;
+use wasmer_interface_types::types::InterfaceType;
+use wasmer_runtime_core::import::Namespace;
 
 const WIT_SECTION_NAME: &str = "interface-types";
+type WITInterpreter =
+    Interpreter<WITInstance, WITExport, WITFunction, WITMemory, WITMemoryView<'static>>;
 
 pub struct WITModule {
     instance: WasmerInstance,
-    wit_instance: WITInstance,
+    wit_instance: Arc<WITInstance>,
-    exports: HashMap<
+    func_name_to_idx: HashMap<String, usize>,
-        String,
+    funcs: HashMap<String, WITInterpreter>,
-        Interpreter<WITInstance, WITExport, WITLocalImport, WITMemory, WITMemoryView<'static>>,
-    >,
-    import_object: ImportObject,
 }
 
 impl WITModule {
-    pub fn new(wasm_bytes: &[u8], imports: &ImportObject) -> Result<Self, WITFCEError> {
+    pub fn new(
-        let wasmer_instance = compile(&wasm_bytes)?.instantiate(imports)?;
+        wasm_bytes: &[u8],
+        imports: ImportObject,
+        modules: &HashMap<String, Arc<WITModule>>,
+    ) -> Result<Self, WITFCEError> {
+        let wasmer_instance = compile(&wasm_bytes)?;
 
         let wit_sections = wasmer_instance
-            .module
+            .custom_sections(WIT_SECTION_NAME)
-            .info
-            .custom_sections
-            .get(WIT_SECTION_NAME)
             .ok_or_else(|| WITFCEError::NoWITSection)?;
 
         if wit_sections.len() > 1 {
@@ -63,61 +69,25 @@ impl WITModule {
             return Err(WITFCEError::WITRemainderNotEmpty);
         }
 
-        let wit_instance = WITInstance::new(&wasmer_instance, &interfaces)?;
+        let mut wit_instance = Arc::new_uninit();
 
-        let wit_export_names = interfaces
+        let callable_exports = Self::extract_exports(&interfaces)?;
-            .imports
+        let mut import_object = Self::adjust_imports(&interfaces, wit_instance.clone())?;
-            .iter()
+        import_object.extend(imports);
-            .map(|export| (export.function_type, export.name.to_string()))
-            .collect::<HashMap<u32, String>>();
 
-        let callable_exports = interfaces
+        let wasmer_instance = wasmer_instance.instantiate(&import_object)?;
-            .adapters
-            .iter()
-            .map(|adapter| {
-                let export_func_name = wit_export_names
-                    .get(&adapter.function_type)
-                    .ok_or_else(|| WITFCEError::NoSuchFunction)?;
-                let instructions = &adapter.instructions;
 
-                let interpreter: Interpreter<
+        let wit_instance = unsafe {
-                    WITInstance,
+            *Arc::get_mut_unchecked(&mut wit_instance) =
-                    WITExport,
+                MaybeUninit::new(WITInstance::new(&wasmer_instance, &interfaces, modules)?);
-                    WITLocalImport,
+            std::mem::transmute::<_, Arc<WITInstance>>(wit_instance)
-                    WITMemory,
+        };
-                    WITMemoryView<'static>,
-                > = instructions.try_into().unwrap();
-
-                Ok((export_func_name.to_owned(), interpreter))
-            })
-            .collect::<Result<HashMap<_, _>, WITFCEError>>()?;
-
-
-        let callable_imports = interfaces
-            .adapters
-            .iter()
-            .map(|adapter| {
-                let import_func_name = wit_export_names
-                    .get(&adapter.function_type)
-                    .ok_or_else(|| WITFCEError::NoSuchFunction)?;
-                let instructions = &adapter.instructions;
-
-                let interpreter: Interpreter<
-                    WITInstance,
-                    WITExport,
-                    WITLocalImport,
-                    WITMemory,
-                    WITMemoryView<'static>,
-                > = instructions.try_into().unwrap();
-
-                Ok((export_func_name.to_owned(), interpreter))
-            })
-            .collect::<Result<HashMap<_, _>, WITFCEError>>()?;
 
         Ok(Self {
             instance: wasmer_instance,
             wit_instance,
-            exports: callable_exports,
+            func_name_to_idx: HashMap::new(),
+            funcs: callable_exports,
         })
     }
 
@@ -126,15 +96,184 @@ impl WITModule {
         function_name: &str,
         args: &[InterfaceValue],
     ) -> Result<Vec<InterfaceValue>, WITFCEError> {
-        match self.exports.get(function_name) {
+        println!("here, func name is {}, args = {:?}", function_name, args);
+        match self.funcs.get(function_name) {
             Some(func) => {
-                let result = func
+                let tt = Arc::make_mut(&mut self.wit_instance);
-                    .run(args, &mut self.wit_instance)?
+
-                    .as_slice()
+                let result = func.run(args, tt)?.as_slice().to_owned();
-                    .to_owned();
+                println!("here {:?}", result);
                 Ok(result)
             }
-            None => Err(WITFCEError::NoSuchFunction),
+            None => {
+                println!("no func");
+                Err(WITFCEError::NoSuchFunction(format!(
+                    "{} hasn't been found while calling",
+                    function_name
+                )))
             }
         }
+    }
+
+    pub fn get_func_signature(
+        &self,
+        function_name: &str,
+    ) -> Result<(Vec<InterfaceType>, Vec<InterfaceType>), WITFCEError> {
+        match self.func_name_to_idx.get(function_name) {
+            Some(func_idx) => {
+                println!("func_idx: {}", func_idx);
+                self.wit_instance.as_ref().get_func_signature(*func_idx)
+            },
+            None => Err(WITFCEError::NoSuchFunction(format!(
+                "{} has't been found during its signature looking up",
+                function_name
+            ))),
+        }
+    }
+
+    fn extract_exports(
+        interfaces: &Interfaces,
+    ) -> Result<HashMap<String, WITInterpreter>, WITFCEError> {
+        let exports_type_to_names = interfaces
+            .exports
+            .iter()
+            .map(|export| (export.function_type, export.name.to_string()))
+            .collect::<MultiMap<_, _>>();
+
+        let adapter_type_to_instructions = interfaces
+            .adapters
+            .iter()
+            .map(|adapter| (adapter.function_type, &adapter.instructions))
+            .collect::<HashMap<_, _>>();
+
+        let mut wit_callable_exports = HashMap::new();
+        for i in interfaces.implementations.iter() {
+            let export_function_names = match exports_type_to_names.get_vec(&i.core_function_type) {
+                Some(export_function_names) => export_function_names,
+                None => continue,
+            };
+
+            // * just to remove reference
+            let adapter_instructions = *adapter_type_to_instructions
+                .get(&i.adapter_function_type)
+                .ok_or_else(|| WITFCEError::NoSuchFunction(
+                    format!("adapter function with idx = {} hasn't been found during extracting exports by implementations", i.adapter_function_type)
+                ))?;
+
+            for export_function_name in export_function_names.iter() {
+                println!("export func name {}", export_function_name);
+
+                // TODO: handle errors
+                let interpreter: WITInterpreter = adapter_instructions.try_into().unwrap();
+                wit_callable_exports.insert(export_function_name.to_owned(), interpreter);
+            }
+        }
+
+        Ok(wit_callable_exports)
+    }
+
+    // this function deals only with import functions that have an adaptor implementation
+    fn adjust_imports(
+        interfaces: &Interfaces,
+        wit_instance: Arc<MaybeUninit<WITInstance>>,
+    ) -> Result<ImportObject, WITFCEError> {
+        use crate::instance::{itype_to_wtype, wval_to_ival};
+        use wasmer_interface_types::ast::Type as IType;
+        use wasmer_runtime_core::typed_func::DynamicFunc;
+        use wasmer_runtime_core::types::{FuncSig, Type as WType, Value};
+        use wasmer_runtime_core::vm::Ctx;
+
+        // returns function that will be called from imports of Wasmer module
+        fn dyn_func_from_imports<F>(inputs: Vec<InterfaceType>, func: F) -> DynamicFunc<'static>
+        where
+            F: Fn(&mut Ctx, &[Value]) -> Vec<Value> + 'static,
+        {
+            let signature = inputs.iter().map(itype_to_wtype).collect::<Vec<_>>();
+            DynamicFunc::new(Arc::new(FuncSig::new(signature, vec![])), func)
+        }
+
+        // uses to filter out import functions that have an adapter implementation
+        let adapter_to_core = interfaces
+            .implementations
+            .iter()
+            .map(|i| (i.adapter_function_type, i.core_function_type))
+            .collect::<HashMap<_, _>>();
+
+        // all wit imports
+        let mut export_type_to_name = interfaces
+            .imports
+            .iter()
+            .map(|import| {
+                (
+                    import.function_type,
+                    (import.namespace.to_string(), import.name.to_string()),
+                )
+            })
+            .collect::<HashMap<_, _>>();
+
+        let mut import_namespaces: HashMap<String, Namespace> = HashMap::new();
+
+        for adapter in interfaces.adapters.iter() {
+            let core_function_idx = adapter_to_core
+                .get(&adapter.function_type)
+                .ok_or_else(|| WITFCEError::NoSuchFunction(format!("function with idx = {} hasn't been found during adjusting imports in WIT implementation", adapter.function_type)))?;
+
+            let (namespace, func_name) = match export_type_to_name.remove(core_function_idx) {
+                Some(v) => (v.0, v.1),
+                None => continue,
+            };
+
+            if adapter.function_type >= interfaces.types.len() as u32 {
+                // TODO: change error type
+                return Err(WITFCEError::NoSuchFunction(format!(
+                    "{} function id is bigger than WIT interface types count",
+                    adapter.function_type
+                )));
+            }
+
+            if let IType::Function { inputs, .. } =
+                &interfaces.types[adapter.function_type as usize]
+            {
+                let instructions = &adapter.instructions;
+                let interpreter: WITInterpreter = instructions.try_into().unwrap();
+
+                let wit_instance = wit_instance.clone();
+                let inner_import = Box::new(move |_: &mut Ctx, inputs: &[Value]| -> Vec<Value> {
+                    println!("calling from import with {:?}", inputs);
+
+                    let tt = wit_instance.clone();
+                    let converted_inputs = inputs.iter().map(wval_to_ival).collect::<Vec<_>>();
+                    //let mut wit_instance_copy = Arc::make_mut(tt).unwrap();
+                    unsafe {
+                        let r = interpreter
+                            .run(&converted_inputs, Arc::make_mut(&mut tt.assume_init()));
+                        println!("import interpreter result is {:?}", r);
+                    }
+
+                    vec![]
+                });
+
+                let linking_import = dyn_func_from_imports(inputs.clone(), inner_import);
+
+                let mut n = Namespace::new();
+                n.insert(func_name.clone(), linking_import);
+
+                import_namespaces.insert(namespace, n);
+            } else {
+                // TODO: change error type
+                return Err(WITFCEError::WasmerResolveError(format!(
+                    "WIT type with idx = {} doesn't refer to function",
+                    adapter.function_type
+                )));
+            }
+        }
+
+        let mut import_object = ImportObject::new();
+
+        for (namespace_name, namespace) in import_namespaces.into_iter() {
+            import_object.register(namespace_name, namespace);
+        }
+
+        Ok(import_object)
+    }
 }

wit_fce/src/main.rs

@@ -13,40 +13,54 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#![feature(get_mut_unchecked)]
+#![feature(new_uninit)]
 
 mod instance;
 
 use crate::instance::wit_module::WITModule;
 
+use std::collections::HashMap;
+use std::sync::Arc;
 use wasmer_interface_types::values::InterfaceValue;
 use wasmer_runtime::{func, imports, ImportObject};
 use wasmer_runtime_core::vm::Ctx;
 
-const FILE_NAME: &str =
+const IPFS_NODE: &str =
-    "/Users/mike/dev/work/fluence/wasm/fce/target/wasm32-unknown-unknown/release/export_test_wit.wasm";
+    "/Users/mike/dev/work/fluence/wasm/fce/target/wasm32-unknown-unknown/release/ipfs_node_wit.wasm";
+
+const IPFS_RPC: &str =
+    "/Users/mike/dev/work/fluence/wasm/fce/target/wasm32-unknown-unknown/release/ipfs_rpc_wit.wasm";
 
 fn main() {
-    let wasm_bytes = std::fs::read(FILE_NAME).unwrap();
+    let ipfs_node_bytes = std::fs::read(IPFS_NODE).unwrap();
-    let logger_imports = imports! {
+    let ipfs_rpc_bytes = std::fs::read(IPFS_RPC).unwrap();
+    let imports = imports! {
         "logger" => {
             "log_utf8_string" => func!(logger_log_utf8_string),
         },
+        "host" => {
+            "ipfs" => func!(ipfs_call),
+        }
     };
     let mut import_object = ImportObject::new();
-    import_object.extend(logger_imports);
+    import_object.extend(imports);
+    let mut modules = HashMap::new();
 
-    let mut module =
+    println!("loading ipfs node module");
-        WITModule::new(&wasm_bytes, &import_object).expect("module successfully created");
+    let ipfs_node = WITModule::new(&ipfs_node_bytes, import_object.clone(), &modules)
+        .expect("module successfully created");
+    modules.insert("node".to_string(), Arc::new(ipfs_node));
 
-    let result1 = module
+    println!("loading ipfs rpc module");
-        .call("strlen", &[InterfaceValue::String("aaaaaa".to_string())])
+    let mut ipfs_rpc = WITModule::new(&ipfs_rpc_bytes, import_object, &modules)
-        .unwrap();
+        .expect("module successfully created");
-    let result2 = module
+
-        .call("greeting", &[InterfaceValue::String("Mike".to_string())])
+    let result1 = ipfs_rpc
+        .call("invoke", &[InterfaceValue::String("aaaaaa".to_string())])
         .unwrap();
 
     println!("stack state {:?}", result1);
-    println!("stack state {:?}", result2);
 }
 
 fn logger_log_utf8_string(ctx: &mut Ctx, offset: i32, size: i32) {
@@ -58,3 +72,13 @@ fn logger_log_utf8_string(ctx: &mut Ctx, offset: i32, size: i32) {
         None => print!("fce logger: incorrect UTF8 string's been supplied to logger"),
     }
 }
+
+fn ipfs_call(ctx: &mut Ctx, ptr: i32, size: i32) {
+    use wasmer_runtime_core::memory::ptr::{Array, WasmPtr};
+
+    let wasm_ptr = WasmPtr::<u8, Array>::new(ptr as _);
+    match wasm_ptr.get_utf8_string(ctx.memory(0), size as _) {
+        Some(msg) => print!("ipfs_call {}", msg),
+        None => print!("fce logger: incorrect UTF8 string's been supplied to logger"),
+    }
+}

wit_fce/src/wit_fce.rs

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use crate::instance::wit_module::WITModule;
+
+use std::collections::HashMap;
+use wasmer_interface_types::values::InterfaceValue;
+use wasmer_runtime::{func, imports, ImportObject};
+use wasmer_runtime_core::vm::Ctx;
+
+pub struct WITFCE {
+
+}