Merge branch 'master' into js-api-improvement

.cargo/config.toml

@@ -1,4 +1,4 @@
-[target.'cfg(target_os = "linux")']
+[target.'cfg(all(target_os = "linux", target_env = "gnu"))']
 rustflags = [
     # Put the VM functions in the dynamic symbol table.
     "-C", "link-arg=-Wl,-E",

.github/workflows/documentation.yaml

@@ -22,14 +22,14 @@ jobs:
       - name: Install LLVM
         shell: bash
         run: |
-          curl --proto '=https' --tlsv1.2 -sSf ${{ env.LLVM_URL }} -L -o llvm.tar.gz
+          curl --proto '=https' --tlsv1.2 -sSf ${{ env.LLVM_URL }} -L -o llvm.tar.xz
           mkdir ${{ env.LLVM_DIR }}
-          tar xf llvm.tar.gz --strip-components=1 -C ${{ env.LLVM_DIR }}
+          tar xf llvm.tar.xz --strip-components=1 -C ${{ env.LLVM_DIR }}
           echo "${{ env.LLVM_DIR }}/bin" >> $GITHUB_PATH
-          echo "LLVM_SYS_110_PREFIX=${{ env.LLVM_DIR }}" >> $GITHUB_ENV
+          echo "LLVM_SYS_120_PREFIX=${{ env.LLVM_DIR }}" >> $GITHUB_ENV
         env:
-          LLVM_DIR: ${{ github.workspace }}/llvm-11
+          LLVM_DIR: ${{ github.workspace }}/llvm-13
-          LLVM_URL: 'https://github.com/wasmerio/llvm-custom-builds/releases/download/11.x/linux-amd64.tar.gz'
+          LLVM_URL: 'https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.0/clang+llvm-13.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz'
       - name: Build & package documentation
         run: make package-docs
       - name: Publish documentation

.github/workflows/lint.yaml

@@ -23,11 +23,11 @@ jobs:
           components: rustfmt, clippy
       - name: Install LLVM (Linux)
         run: |
-          curl --proto '=https' --tlsv1.2 -sSf https://github.com/wasmerio/llvm-custom-builds/releases/download/11.x/linux-amd64.tar.gz -L -o /opt/llvm.tar.gz
+          curl --proto '=https' --tlsv1.2 -sSf https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.0/clang+llvm-13.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz -L -o /opt/llvm.tar.xz
-          mkdir -p /opt/llvm-11
+          mkdir -p /opt/llvm-12
-          tar xf /opt/llvm.tar.gz --strip-components=1 -C /opt/llvm-11
+          tar xf /opt/llvm.tar.xz --strip-components=1 -C /opt/llvm-12
-          echo '/opt/llvm-11/bin' >> $GITHUB_PATH
+          echo '/opt/llvm-12/bin' >> $GITHUB_PATH
-          echo 'LLVM_SYS_110_PREFIX=/opt/llvm-11' >> $GITHUB_ENV
+          echo 'LLVM_SYS_120_PREFIX=/opt/llvm-12' >> $GITHUB_ENV
       - run: make lint
         env:
           ENABLE_CRANELIFT: "1"

.github/workflows/test-sys.yaml

@@ -42,7 +42,7 @@ jobs:
         include:
           - build: linux-x64
             os: ubuntu-18.04
-            llvm_url: 'https://github.com/wasmerio/llvm-custom-builds/releases/download/11.x/linux-amd64.tar.gz'
+            llvm_url: 'https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.0/clang+llvm-13.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz'
             artifact_name: 'wasmer-linux-amd64'
             cross_compilation_artifact_name: 'cross_compiled_from_linux'
             run_test: true
@@ -51,7 +51,7 @@ jobs:
             use_sccache: true
           - build: macos-x64
             os: macos-11
-            llvm_url: 'https://github.com/wasmerio/llvm-custom-builds/releases/download/11.x/darwin-amd64.tar.gz'
+            llvm_url: 'https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.0/clang+llvm-13.0.0-x86_64-apple-darwin.tar.xz'
             artifact_name: 'wasmer-darwin-amd64'
             cross_compilation_artifact_name: 'cross_compiled_from_mac'
             run_test: true
@@ -68,8 +68,8 @@ jobs:
             run_test_capi: false
           - build: windows-x64
             os: windows-latest
-            # llvm_url: 'https://github.com/wasmerio/llvm-custom-builds/releases/download/11.x/windows-amd64.tar.gz'
+            # llvm_url: 'https://github.com/wasmerio/llvm-custom-builds/releases/download/12.x/windows-amd64.tar.gz'
-            llvm_choco_version: 12.0.1
+            llvm_choco_version: 13.0.0
             artifact_name: 'wasmer-windows-amd64'
             cross_compilation_artifact_name: 'cross_compiled_from_win'
             run_integration_tests: true
@@ -80,7 +80,7 @@ jobs:
           #  os: [self-hosted, linux, ARM64]
           #  random_sccache_port: true
           #  use_sccache: true
-          #  llvm_url: 'https://github.com/wasmerio/llvm-custom-builds/releases/download/11.x/linux-aarch64.tar.gz'
+          #  llvm_url: 'https://github.com/wasmerio/llvm-custom-builds/releases/download/12.x/linux-aarch64.tar.gz'
           #  artifact_name: 'wasmer-linux-aarch64'
           #  run_integration_tests: false
           - build: linux-musl-x64
@@ -122,7 +122,7 @@ jobs:
           choco install llvm --version ${{ matrix.llvm_choco_version }} --allow-downgrade
           cd 'C:\Program Files\LLVM\'
           LLVM_DIR=$(pwd)
-          echo "LLVM_SYS_110_PREFIX=${LLVM_DIR}" >> $GITHUB_ENV
+          echo "LLVM_SYS_120_PREFIX=${LLVM_DIR}" >> $GITHUB_ENV
       - name: Install LLVM (macOS Apple Silicon)
         if: matrix.os == 'macos-11.0' && !matrix.llvm_url
         run: |
@@ -131,12 +131,12 @@ jobs:
         if: matrix.llvm_url
         shell: bash
         run: |
-          curl --proto '=https' --tlsv1.2 -sSf ${{ matrix.llvm_url }} -L -o llvm.tar.gz
+          curl --proto '=https' --tlsv1.2 -sSf ${{ matrix.llvm_url }} -L -o llvm.tar.xz
           LLVM_DIR=$(pwd)/${{ env.LLVM_DIR }}
           mkdir ${LLVM_DIR}
-          tar xf llvm.tar.gz --strip-components=1 -C ${LLVM_DIR}
+          tar xf llvm.tar.xz --strip-components=1 -C ${LLVM_DIR}
           echo "${LLVM_DIR}/bin" >> $GITHUB_PATH
-          echo "LLVM_SYS_110_PREFIX=${LLVM_DIR}" >> $GITHUB_ENV
+          echo "LLVM_SYS_120_PREFIX=${LLVM_DIR}" >> $GITHUB_ENV
         env:
           LLVM_DIR: .llvm
       - name: Set up dependencies for Mac OS

Cargo.lock

@@ -210,6 +210,27 @@ version = "3.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c59e7af012c713f529e7a3ee57ce9b31ddd858d4b512923602f74608b009631"
 
+[[package]]
+name = "bytecheck"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fb738a1e65989ecdcd5bba16079641bd7209688fa546e1064832fd6e012fd32a"
+dependencies = [
+ "bytecheck_derive",
+ "ptr_meta",
+]
+
+[[package]]
+name = "bytecheck_derive"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3b4dff26fdc9f847dab475c9fec16f2cba82d5aa1f09981b87c44520721e10a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "byteorder"
 version = "1.4.3"
@@ -1156,9 +1177,9 @@ dependencies = [
 
 [[package]]
 name = "llvm-sys"
-version = "110.0.2"
+version = "120.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b7cc88ba864d592f52132ed3a19a97118fe16c92a63961f54b0ab7279c5407f"
+checksum = "b4a810627ac62b396f5fd2214ba9bbd8748d4d6efdc4d2c1c1303ea7a75763ce"
 dependencies = [
  "cc",
  "lazy_static",
@@ -1773,22 +1794,33 @@ dependencies = [
 ]
 
 [[package]]
-name = "rkyv"
+name = "rend"
-version = "0.6.7"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cb135b3e5e3311f0a254bfb00333f4bac9ef1d89888b84242a89eb8722b09a07"
+checksum = "6d0351a2e529ee30d571ef31faa5a4e0b9addaad087697b77efb20d2809e41c7"
 dependencies = [
- "memoffset",
+ "bytecheck",
+]
+
+[[package]]
+name = "rkyv"
+version = "0.7.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e419b2e30d088b21c4bf3072561535305df8066e89937ad05fc205b99874c23c"
+dependencies = [
+ "bytecheck",
+ "hashbrown 0.11.2",
  "ptr_meta",
+ "rend",
  "rkyv_derive",
  "seahash",
 ]
 
 [[package]]
 name = "rkyv_derive"
-version = "0.6.7"
+version = "0.7.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba8f489f6b6d8551bb15904293c1ad58a6abafa7d8390d15f7ed05a2afcd87d5"
+checksum = "2ae58c4ba80f15f2f0842f4c61729e92c4e33a09bd78196c2b1ab9b0771a3ddf"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2723,7 +2755,6 @@ dependencies = [
  "lazy_static",
  "libc",
  "paste",
- "rayon",
  "serde",
  "thiserror",
  "typetag",
@@ -2901,6 +2932,7 @@ name = "wasmer-engine"
 version = "2.0.0"
 dependencies = [
  "backtrace",
+ "enumset",
  "lazy_static",
  "loupe",
  "memmap2",
@@ -2920,6 +2952,7 @@ name = "wasmer-engine-dummy"
 version = "2.0.0"
 dependencies = [
  "bincode",
+ "enumset",
  "loupe",
  "serde",
  "serde_bytes",
@@ -2934,6 +2967,7 @@ name = "wasmer-engine-dylib"
 version = "2.0.0"
 dependencies = [
  "cfg-if 1.0.0",
+ "enumset",
  "leb128",
  "libloading",
  "loupe",
@@ -2955,6 +2989,7 @@ version = "2.0.0"
 dependencies = [
  "bincode",
  "cfg-if 1.0.0",
+ "enumset",
  "leb128",
  "libloading",
  "loupe",
@@ -2973,6 +3008,7 @@ name = "wasmer-engine-universal"
 version = "2.0.0"
 dependencies = [
  "cfg-if 1.0.0",
+ "enumset",
  "leb128",
  "loupe",
  "region",

Makefile

@@ -134,24 +134,19 @@ ifneq ($(ENABLE_LLVM), 0)
 		LLVM_VERSION := $(shell llvm-config --version)
 
 		# If findstring is not empty, then it have found the value
-		ifneq (, $(findstring 12,$(LLVM_VERSION)))
+		ifneq (, $(findstring 13,$(LLVM_VERSION)))
 			compilers += llvm
-		else ifneq (, $(findstring 11,$(LLVM_VERSION)))
+		else ifneq (, $(findstring 12,$(LLVM_VERSION)))
-			compilers += llvm
-		else ifneq (, $(findstring 10,$(LLVM_VERSION)))
 			compilers += llvm
 		endif
 	# … or try to autodetect LLVM from `llvm-config-<version>`.
 	else
-		ifneq (, $(shell which llvm-config-12 2>/dev/null))
+		ifneq (, $(shell which llvm-config-13 2>/dev/null))
+			LLVM_VERSION := $(shell llvm-config-13 --version)
+			compilers += llvm
+		else ifneq (, $(shell which llvm-config-12 2>/dev/null))
 			LLVM_VERSION := $(shell llvm-config-12 --version)
 			compilers += llvm
-		else ifneq (, $(shell which llvm-config-11 2>/dev/null))
-			LLVM_VERSION := $(shell llvm-config-11 --version)
-			compilers += llvm
-		else ifneq (, $(shell which llvm-config-10 2>/dev/null))
-			LLVM_VERSION := $(shell llvm-config-10 --version)
-			compilers += llvm
 		endif
 	endif
 endif

fuzz/Cargo.toml

@@ -57,3 +57,8 @@ required-features = ["universal", "cranelift"]
 name = "dylib_cranelift"
 path = "fuzz_targets/dylib_cranelift.rs"
 required-features = ["dylib", "cranelift"]
+
+[[bin]]
+name = "deterministic"
+path = "fuzz_targets/deterministic.rs"
+required-features = ["universal", "dylib", "cranelift", "llvm", "singlepass"]

fuzz/fuzz_targets/deterministic.rs

@@ -0,0 +1,81 @@
+#![no_main]
+
+use libfuzzer_sys::{arbitrary, arbitrary::Arbitrary, fuzz_target};
+use wasm_smith::{Config, ConfiguredModule};
+use wasmer::{CompilerConfig, Engine, Module, Store};
+use wasmer_compiler_cranelift::Cranelift;
+use wasmer_compiler_llvm::LLVM;
+use wasmer_compiler_singlepass::Singlepass;
+use wasmer_engine_dylib::Dylib;
+use wasmer_engine_universal::Universal;
+
+#[derive(Arbitrary, Debug, Default, Copy, Clone)]
+struct NoImportsConfig;
+impl Config for NoImportsConfig {
+    fn max_imports(&self) -> usize {
+        0
+    }
+    fn max_memory_pages(&self) -> u32 {
+        // https://github.com/wasmerio/wasmer/issues/2187
+        65535
+    }
+    fn allow_start_export(&self) -> bool {
+        false
+    }
+}
+
+fn compile_and_compare(name: &str, engine: impl Engine, wasm: &[u8]) {
+    let store = Store::new(&engine);
+
+    // compile for first time
+    let module = Module::new(&store, wasm).unwrap();
+    let first = module.serialize().unwrap();
+
+    // compile for second time
+    let module = Module::new(&store, wasm).unwrap();
+    let second = module.serialize().unwrap();
+
+    if first != second {
+        panic!("non-deterministic compilation from {}", name);
+    }
+}
+
+fuzz_target!(|module: ConfiguredModule<NoImportsConfig>| {
+    let wasm_bytes = module.to_bytes();
+
+    let mut compiler = Cranelift::default();
+    compiler.canonicalize_nans(true);
+    compiler.enable_verifier();
+    compile_and_compare(
+        "universal-cranelift",
+        Universal::new(compiler.clone()).engine(),
+        &wasm_bytes,
+    );
+    //compile_and_compare(
+    //    "dylib-cranelift",
+    //    Dylib::new(compiler).engine(),
+    //    &wasm_bytes,
+    //);
+
+    let mut compiler = LLVM::default();
+    compiler.canonicalize_nans(true);
+    compiler.enable_verifier();
+    compile_and_compare(
+        "universal-llvm",
+        Universal::new(compiler.clone()).engine(),
+        &wasm_bytes,
+    );
+    //compile_and_compare("dylib-llvm", Dylib::new(compiler).engine(), &wasm_bytes);
+
+    let compiler = Singlepass::default();
+    compile_and_compare(
+        "universal-singlepass",
+        Universal::new(compiler.clone()).engine(),
+        &wasm_bytes,
+    );
+    //compile_and_compare(
+    //    "dylib-singlepass",
+    //    Dylib::new(compiler).engine(),
+    //    &wasm_bytes,
+    //);
+});

lib/api/src/js/externals/function.rs

@@ -1288,7 +1288,7 @@ mod inner {
 
         #[test]
         fn test_into_array() {
-            assert_eq!(().into_array(), []);
+            assert_eq!(().into_array(), [0i128; 0]);
             assert_eq!((1).into_array(), [1]);
             assert_eq!((1i32, 2i64).into_array(), [1, 2]);
             assert_eq!(

lib/api/src/sys/externals/function.rs

@@ -1472,7 +1472,7 @@ mod inner {
 
         #[test]
         fn test_into_array() {
-            assert_eq!(().into_array(), []);
+            assert_eq!(().into_array(), [0i128; 0]);
             assert_eq!((1).into_array(), [1]);
             assert_eq!((1i32, 2i64).into_array(), [1, 2]);
             assert_eq!(

lib/api/src/sys/instance.rs

@@ -58,6 +58,11 @@ pub enum InstantiationError {
     #[error(transparent)]
     Start(RuntimeError),
 
+    /// The module was compiled with a CPU feature that is not available on
+    /// the current host.
+    #[error("missing requires CPU features: {0:?}")]
+    CpuFeature(String),
+
     /// Error occurred when initializing the host environment.
     #[error(transparent)]
     HostEnvInitialization(HostEnvInitError),
@@ -68,6 +73,7 @@ impl From<wasmer_engine::InstantiationError> for InstantiationError {
         match other {
             wasmer_engine::InstantiationError::Link(e) => Self::Link(e),
             wasmer_engine::InstantiationError::Start(e) => Self::Start(e),
+            wasmer_engine::InstantiationError::CpuFeature(e) => Self::CpuFeature(e),
         }
     }
 }

lib/c-api/Cargo.toml

@@ -42,7 +42,6 @@ serde = { version = "1", optional = true, features = ["derive"] }
 thiserror = "1"
 typetag = { version = "0.1", optional = true }
 paste = "1.0"
-rayon = "1.5"
 
 [dev-dependencies]
 field-offset = "0.3.3"

lib/c-api/examples/exports-global.c

@@ -103,12 +103,15 @@ int main(int argc, const char* argv[]) {
         wasmer_last_error_message(error_message, error_length);
 
         printf("Attempted to set an immutable global: `%s`\n", error_message);
+        free(error_message);
     }
 
     wasm_val_t some_set_value = WASM_F32_VAL(21);
     wasm_global_set(some, &some_set_value);
     printf("`some` value: %.1f\n", some_value.of.f32);
 
+    wasm_globaltype_delete(one_type);
+    wasm_globaltype_delete(some_type);
     wasm_module_delete(module);
     wasm_extern_vec_delete(&exports);
     wasm_instance_delete(instance);

lib/c-api/examples/imports-exports.c

@@ -63,6 +63,8 @@ int main(int argc, const char* argv[]) {
 
     printf("Instantiating module...\n");
     wasm_instance_t* instance = wasm_instance_new(store, module, &import_object, NULL);
+    wasm_func_delete(host_func);
+    wasm_global_delete(host_global);
 
     if (!instance) {
       printf("> Error instantiating module!\n");

lib/c-api/examples/instance.c

@@ -15,6 +15,7 @@ int main(int argc, const char* argv[]) {
     wasm_byte_vec_new(&wat, strlen(wat_string), wat_string);
     wasm_byte_vec_t wasm_bytes;
     wat2wasm(&wat, &wasm_bytes);
+    wasm_byte_vec_delete(&wat);
 
     printf("Creating the store...\n");
     wasm_engine_t* engine = wasm_engine_new();

lib/c-api/examples/wasi.c

@@ -69,13 +69,7 @@ int main(int argc, const char* argv[]) {
 
   // Instantiate.
   printf("Instantiating module...\n");
-  wasm_importtype_vec_t import_types;
-  wasm_module_imports(module, &import_types);
-
   wasm_extern_vec_t imports;
-  wasm_extern_vec_new_uninitialized(&imports, import_types.size);
-  wasm_importtype_vec_delete(&import_types);
-
   bool get_imports_result = wasi_get_imports(store, module, wasi_env, &imports);
 
   if (!get_imports_result) {
@@ -153,6 +147,7 @@ int main(int argc, const char* argv[]) {
     fclose(memory_stream);
 
     printf("WASI Stdout: `%.*s`\n", (int) stdout_size, stdout);
+    free(stdout);
   }
 
 

lib/c-api/src/error.rs

@@ -49,13 +49,12 @@
 
 use libc::{c_char, c_int};
 use std::cell::RefCell;
-use std::error::Error;
+use std::fmt::Display;
-use std::fmt::{self, Display, Formatter};
 use std::ptr::{self, NonNull};
 use std::slice;
 
 thread_local! {
-    static LAST_ERROR: RefCell<Option<Box<dyn Error>>> = RefCell::new(None);
+    static LAST_ERROR: RefCell<Option<String>> = RefCell::new(None);
 }
 
 /// Rust function to register a new error.
@@ -63,24 +62,23 @@ thread_local! {
 /// # Example
 ///
 /// ```rust,no_run
-/// # use wasmer::error::{update_last_error, CApiError};
+/// # use wasmer::error::update_last_error;
 ///
-/// update_last_error(CApiError {
+/// update_last_error("Hello, World!");
-///     msg: "Hello, World!".to_string(),
-/// });
 /// ```
-pub fn update_last_error<E: Error + 'static>(err: E) {
+pub fn update_last_error<E: Display>(err: E) {
     LAST_ERROR.with(|prev| {
-        *prev.borrow_mut() = Some(Box::new(err));
+        *prev.borrow_mut() = Some(err.to_string());
     });
 }
 
 /// Retrieve the most recent error, clearing it in the process.
-pub(crate) fn take_last_error() -> Option<Box<dyn Error>> {
+pub(crate) fn take_last_error() -> Option<String> {
     LAST_ERROR.with(|prev| prev.borrow_mut().take())
 }
 
-/// Gets the length in bytes of the last error if any, zero otherwise.
+/// Gets the length in bytes of the last error if any, zero otherwise. This
+/// includes th NUL terminator byte.
 ///
 /// This can be used to dynamically allocate a buffer with the correct number of
 /// bytes needed to store a message.
@@ -88,10 +86,11 @@ pub(crate) fn take_last_error() -> Option<Box<dyn Error>> {
 /// # Example
 ///
 /// See this module's documentation to get a complete example.
+// TODO(Amanieu): This should use size_t
 #[no_mangle]
 pub extern "C" fn wasmer_last_error_length() -> c_int {
     LAST_ERROR.with(|prev| match *prev.borrow() {
-        Some(ref err) => err.to_string().len() as c_int + 1,
+        Some(ref err) => err.len() as c_int + 1,
         None => 0,
     })
 }
@@ -118,6 +117,7 @@ pub extern "C" fn wasmer_last_error_length() -> c_int {
 /// # Example
 ///
 /// See this module's documentation to get a complete example.
+// TODO(Amanieu): This should use size_t
 #[no_mangle]
 pub unsafe extern "C" fn wasmer_last_error_message(
     buffer: Option<NonNull<c_char>>,
@@ -156,18 +156,3 @@ pub unsafe extern "C" fn wasmer_last_error_message(
 
     error_message.len() as c_int + 1
 }
-
-/// Rust type to represent a C API error.
-#[derive(Debug)]
-pub struct CApiError {
-    /// The error message.
-    pub msg: String,
-}
-
-impl Display for CApiError {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        write!(f, "{}", &self.msg)
-    }
-}
-
-impl Error for CApiError {}

lib/c-api/src/ordered_resolver.rs

@@ -4,7 +4,6 @@
 //! This resolver is used in the Wasm-C-API as the imports are provided
 //! by index and not by module and name.
 
-use rayon::iter::{FromParallelIterator, IntoParallelIterator, ParallelIterator};
 use std::iter::FromIterator;
 use wasmer_api::{Export, Exportable, Extern, Resolver};
 
@@ -26,16 +25,10 @@ impl Resolver for OrderedResolver {
 
 impl FromIterator<Extern> for OrderedResolver {
     fn from_iter<I: IntoIterator<Item = Extern>>(iter: I) -> Self {
-        OrderedResolver {
+        let mut externs = Vec::new();
-            externs: iter.into_iter().collect(),
+        for extern_ in iter {
-        }
+            externs.push(extern_);
-    }
-}
-
-impl FromParallelIterator<Extern> for OrderedResolver {
-    fn from_par_iter<I: IntoParallelIterator<Item = Extern>>(iter: I) -> Self {
-        OrderedResolver {
-            externs: iter.into_par_iter().collect(),
         }
+        OrderedResolver { externs }
     }
 }

lib/c-api/src/wasm_c_api/engine.rs

@@ -9,7 +9,7 @@ pub use super::unstable::middlewares::wasm_config_push_middleware;
 #[cfg(feature = "middlewares")]
 use super::unstable::middlewares::wasmer_middleware_t;
 use super::unstable::target_lexicon::wasmer_target_t;
-use crate::error::{update_last_error, CApiError};
+use crate::error::update_last_error;
 use cfg_if::cfg_if;
 use std::sync::Arc;
 use wasmer_api::Engine;
@@ -433,13 +433,8 @@ pub extern "C" fn wasm_engine_new_with_config(
     config: Option<Box<wasm_config_t>>,
 ) -> Option<Box<wasm_engine_t>> {
     #[allow(dead_code)]
-    fn return_with_error<M>(msg: M) -> Option<Box<wasm_engine_t>>
+    fn return_with_error(msg: &str) -> Option<Box<wasm_engine_t>> {
-    where
+        update_last_error(msg);
-        M: ToString,
-    {
-        update_last_error(CApiError {
-            msg: msg.to_string(),
-        });
 
         return None;
     }

lib/c-api/src/wasm_c_api/externals/function.rs

@@ -5,6 +5,7 @@ use super::super::value::{wasm_val_inner, wasm_val_t, wasm_val_vec_t};
 use super::CApiExternTag;
 use std::convert::TryInto;
 use std::ffi::c_void;
+use std::mem::MaybeUninit;
 use std::sync::Arc;
 use wasmer_api::{Function, RuntimeError, Val};
 
@@ -27,16 +28,16 @@ impl wasm_func_t {
 
 #[allow(non_camel_case_types)]
 pub type wasm_func_callback_t = unsafe extern "C" fn(
-    args: *const wasm_val_vec_t,
+    args: &wasm_val_vec_t,
-    results: *mut wasm_val_vec_t,
+    results: &mut wasm_val_vec_t,
-) -> *mut wasm_trap_t;
+) -> Option<Box<wasm_trap_t>>;
 
 #[allow(non_camel_case_types)]
 pub type wasm_func_callback_with_env_t = unsafe extern "C" fn(
     env: *mut c_void,
-    args: *const wasm_val_vec_t,
+    args: &wasm_val_vec_t,
-    results: *mut wasm_val_vec_t,
+    results: &mut wasm_val_vec_t,
-) -> *mut wasm_trap_t;
+) -> Option<Box<wasm_trap_t>>;
 
 #[allow(non_camel_case_types)]
 pub type wasm_env_finalizer_t = unsafe extern "C" fn(*mut c_void);
@@ -72,15 +73,12 @@ pub unsafe extern "C" fn wasm_func_new(
 
         let trap = callback(&processed_args, &mut results);
 
-        if !trap.is_null() {
+        if let Some(trap) = trap {
-            let trap: Box<wasm_trap_t> = Box::from_raw(trap);
-
             return Err(trap.inner);
         }
 
         let processed_results = results
-            .into_slice()
+            .take()
-            .expect("Failed to convert `results` into a slice")
             .into_iter()
             .map(TryInto::try_into)
             .collect::<Result<Vec<Val>, _>>()
@@ -124,12 +122,8 @@ pub unsafe extern "C" fn wasm_func_new_with_env(
 
     impl Drop for WrapperEnv {
         fn drop(&mut self) {
-            if let Some(env_finalizer) =
+            if let Some(env_finalizer) = *self.env_finalizer {
-                Arc::get_mut(&mut self.env_finalizer).and_then(Option::take)
+                unsafe { (env_finalizer)(self.env as _) }
-            {
-                if !self.env.is_null() {
-                    unsafe { (env_finalizer)(self.env as _) }
-                }
             }
         }
     }
@@ -153,15 +147,12 @@ pub unsafe extern "C" fn wasm_func_new_with_env(
 
         let trap = callback(env.env, &processed_args, &mut results);
 
-        if !trap.is_null() {
+        if let Some(trap) = trap {
-            let trap: Box<wasm_trap_t> = Box::from_raw(trap);
-
             return Err(trap.inner);
         }
 
         let processed_results = results
-            .into_slice()
+            .take()
-            .expect("Failed to convert `results` into a slice")
             .into_iter()
             .map(TryInto::try_into)
             .collect::<Result<Vec<Val>, _>>()
@@ -201,39 +192,21 @@ pub unsafe extern "C" fn wasm_func_call(
     let args = args?;
 
     let params = args
-        .into_slice()
+        .as_slice()
-        .map(|slice| {
+        .iter()
-            slice
+        .cloned()
-                .into_iter()
+        .map(TryInto::try_into)
-                .map(TryInto::try_into)
+        .collect::<Result<Vec<Val>, _>>()
-                .collect::<Result<Vec<Val>, _>>()
+        .expect("Arguments conversion failed");
-                .expect("Arguments conversion failed")
-        })
-        .unwrap_or_default();
 
     match func.inner.call(&params) {
         Ok(wasm_results) => {
-            let vals = wasm_results
+            for (slot, val) in results
-                .into_iter()
+                .as_uninit_slice()
-                .map(TryInto::try_into)
+                .iter_mut()
-                .collect::<Result<Vec<wasm_val_t>, _>>()
+                .zip(wasm_results.into_iter())
-                .expect("Results conversion failed");
+            {
-
+                *slot = MaybeUninit::new(val.try_into().expect("Results conversion failed"));
-            // `results` is an uninitialized vector. Set a new value.
-            if results.is_uninitialized() {
-                *results = vals.into();
-            }
-            // `results` is an initialized but empty vector. Fill it
-            // item per item.
-            else {
-                let slice = results
-                    .into_slice_mut()
-                    .expect("`wasm_func_call`, results' size is greater than 0 but data is NULL");
-
-                for (result, value) in slice.iter_mut().zip(vals.iter()) {
-                    (*result).kind = value.kind;
-                    (*result).of = value.of;
-                }
             }
 
             None

lib/c-api/src/wasm_c_api/externals/global.rs

@@ -48,7 +48,6 @@ pub unsafe extern "C" fn wasm_global_new(
 #[no_mangle]
 pub unsafe extern "C" fn wasm_global_delete(_global: Option<Box<wasm_global_t>>) {}
 
-// TODO: figure out if these should be deep or shallow copies
 #[no_mangle]
 pub unsafe extern "C" fn wasm_global_copy(global: &wasm_global_t) -> Box<wasm_global_t> {
     // do shallow copy

lib/c-api/src/wasm_c_api/externals/memory.rs

@@ -38,7 +38,6 @@ pub unsafe extern "C" fn wasm_memory_new(
 #[no_mangle]
 pub unsafe extern "C" fn wasm_memory_delete(_memory: Option<Box<wasm_memory_t>>) {}
 
-// TODO: figure out if these should be deep or shallow copies
 #[no_mangle]
 pub unsafe extern "C" fn wasm_memory_copy(memory: &wasm_memory_t) -> Box<wasm_memory_t> {
     // do shallow copy

lib/c-api/src/wasm_c_api/externals/mod.rs

@@ -6,7 +6,7 @@ mod table;
 pub use function::*;
 pub use global::*;
 pub use memory::*;
-use std::mem;
+use std::mem::{self, ManuallyDrop};
 pub use table::*;
 use wasmer_api::{Extern, ExternType};
 
@@ -150,13 +150,23 @@ impl From<Extern> for wasm_extern_t {
 }
 
 impl From<wasm_extern_t> for Extern {
-    fn from(other: wasm_extern_t) -> Self {
+    fn from(mut other: wasm_extern_t) -> Self {
-        match other.get_tag() {
+        let out = match other.get_tag() {
-            CApiExternTag::Function => unsafe { (&*other.inner.function.inner).clone().into() },
+            CApiExternTag::Function => unsafe {
-            CApiExternTag::Memory => unsafe { (&*other.inner.memory.inner).clone().into() },
+                (*ManuallyDrop::take(&mut other.inner.function).inner).into()
-            CApiExternTag::Table => unsafe { (&*other.inner.table.inner).clone().into() },
+            },
-            CApiExternTag::Global => unsafe { (&*other.inner.global.inner).clone().into() },
+            CApiExternTag::Memory => unsafe {
-        }
+                (*ManuallyDrop::take(&mut other.inner.memory).inner).into()
+            },
+            CApiExternTag::Table => unsafe {
+                (*ManuallyDrop::take(&mut other.inner.table).inner).into()
+            },
+            CApiExternTag::Global => unsafe {
+                (*ManuallyDrop::take(&mut other.inner.global).inner).into()
+            },
+        };
+        mem::forget(other);
+        out
     }
 }
 

lib/c-api/src/wasm_c_api/instance.rs

@@ -1,10 +1,8 @@
-use super::externals::{wasm_extern_t, wasm_extern_vec_t};
+use super::externals::wasm_extern_vec_t;
 use super::module::wasm_module_t;
 use super::store::wasm_store_t;
 use super::trap::wasm_trap_t;
 use crate::ordered_resolver::OrderedResolver;
-use rayon::prelude::*;
-use std::mem;
 use std::sync::Arc;
 use wasmer_api::{Extern, Instance, InstantiationError};
 
@@ -42,7 +40,7 @@ pub unsafe extern "C" fn wasm_instance_new(
     _store: Option<&wasm_store_t>,
     module: Option<&wasm_module_t>,
     imports: Option<&wasm_extern_vec_t>,
-    trap: *mut *mut wasm_trap_t,
+    trap: Option<&mut *mut wasm_trap_t>,
 ) -> Option<Box<wasm_instance_t>> {
     let module = module?;
     let imports = imports?;
@@ -51,10 +49,9 @@ pub unsafe extern "C" fn wasm_instance_new(
     let module_imports = wasm_module.imports();
     let module_import_count = module_imports.len();
     let resolver: OrderedResolver = imports
-        .into_slice()
+        .as_slice()
-        .map(|imports| imports.par_iter())
+        .iter()
-        .unwrap_or_else(|| [].par_iter())
+        .map(|imp| Extern::from(imp.as_ref().unwrap().as_ref().clone()))
-        .map(|imp| Extern::from((&**imp).clone()))
         .take(module_import_count)
         .collect();
 
@@ -68,8 +65,16 @@ pub unsafe extern "C" fn wasm_instance_new(
         }
 
         Err(InstantiationError::Start(runtime_error)) => {
-            let this_trap: Box<wasm_trap_t> = Box::new(runtime_error.into());
+            if let Some(trap) = trap {
-            *trap = Box::into_raw(this_trap);
+                let this_trap: Box<wasm_trap_t> = Box::new(runtime_error.into());
+                *trap = Box::into_raw(this_trap);
+            }
+
+            return None;
+        }
+
+        Err(e @ InstantiationError::CpuFeature(_)) => {
+            crate::error::update_last_error(e);
 
             return None;
         }
@@ -182,17 +187,13 @@ pub unsafe extern "C" fn wasm_instance_exports(
     out: &mut wasm_extern_vec_t,
 ) {
     let instance = &instance.inner;
-    let mut extern_vec = instance
+    let extern_vec = instance
         .exports
         .iter()
-        .map(|(_name, r#extern)| Box::into_raw(Box::new(r#extern.clone().into())))
+        .map(|(_name, r#extern)| Some(Box::new(r#extern.clone().into())))
-        .collect::<Vec<*mut wasm_extern_t>>();
+        .collect();
-    extern_vec.shrink_to_fit();
 
-    out.size = extern_vec.len();
+    out.set_buffer(extern_vec);
-    out.data = extern_vec.as_mut_ptr();
-
-    mem::forget(extern_vec);
 }
 
 #[cfg(test)]

lib/c-api/src/wasm_c_api/macros.rs

@@ -1,13 +1,121 @@
-#[doc(hidden)]
-#[macro_export]
 macro_rules! wasm_declare_vec_inner {
-    ($name:ident) => {
+    (
-        wasm_declare_vec_inner!($name, wasm);
+        name: $name:ident,
-    };
+        ty: $elem_ty:ty,
+        c_ty: $c_ty:expr,
+        c_val: $c_val:expr,
+        new: $new:ident,
+        empty: $empty:ident,
+        uninit: $uninit:ident,
+        copy: $copy:ident,
+        delete: $delete:ident,
+    ) => {
+        #[doc = concat!("Represents a vector of `", $c_ty, "`.
 
-    ($name:ident, $prefix:ident) => {
+Read the documentation of [`", $c_ty, "`] to see more concrete examples.
-        paste::paste! {
+
-            #[doc = "Creates an empty vector of [`" $prefix "_" $name "_t`].
+# Example
+
+```rust
+# use inline_c::assert_c;
+# fn main() {
+#    (assert_c! {
+# #include \"tests/wasmer.h\"
+#
+void example(", $c_ty, " x, ", $c_ty, " y) {
+    // Create a vector of 2 `", $c_ty, "`.
+    ", $c_ty, " items[2] = {x, y};
+
+    ", stringify!($name), " vector;
+    ", stringify!($new), "(&vector, 2, items);
+
+    // Check that it contains 2 items.
+    assert(vector.size == 2);
+
+    // Free it.
+    ", stringify!($delete), "(&vector);
+}
+#
+# int main() { example(", $c_val, ", ", $c_val, "); return 0; }
+#    })
+#    .success();
+# }
+```")]
+        #[repr(C)]
+        pub struct $name {
+            pub size: usize,
+            pub data: *mut $elem_ty,
+        }
+
+        impl $name {
+            // Note that this does not free any existing buffer.
+            pub fn set_buffer(&mut self, buffer: Vec<$elem_ty>) {
+                let mut vec = buffer.into_boxed_slice();
+                self.size = vec.len();
+                self.data = vec.as_mut_ptr();
+                std::mem::forget(vec);
+            }
+
+            pub fn as_slice(&self) -> &[$elem_ty] {
+                // Note that we're careful to not create a slice with a null
+                // pointer as the data pointer, since that isn't defined
+                // behavior in Rust.
+                if self.size == 0 {
+                    &[]
+                } else {
+                    assert!(!self.data.is_null());
+                    unsafe { std::slice::from_raw_parts(self.data, self.size) }
+                }
+            }
+
+            pub fn as_uninit_slice(&mut self) -> &mut [std::mem::MaybeUninit<$elem_ty>] {
+                // Note that we're careful to not create a slice with a null
+                // pointer as the data pointer, since that isn't defined
+                // behavior in Rust.
+                if self.size == 0 {
+                    &mut []
+                } else {
+                    assert!(!self.data.is_null());
+                    unsafe { std::slice::from_raw_parts_mut(self.data as _, self.size) }
+                }
+            }
+
+            pub fn take(&mut self) -> Vec<$elem_ty> {
+                if self.data.is_null() {
+                    return Vec::new();
+                }
+                let vec = unsafe { Vec::from_raw_parts(self.data, self.size, self.size) };
+                self.data = std::ptr::null_mut();
+                self.size = 0;
+                return vec;
+            }
+        }
+
+        impl From<Vec<$elem_ty>> for $name {
+            fn from(vec: Vec<$elem_ty>) -> Self {
+                let mut vec = vec.into_boxed_slice();
+                let result = $name {
+                    size: vec.len(),
+                    data: vec.as_mut_ptr(),
+                };
+                std::mem::forget(vec);
+                result
+            }
+        }
+
+        impl Clone for $name {
+            fn clone(&self) -> Self {
+                self.as_slice().to_vec().into()
+            }
+        }
+
+        impl Drop for $name {
+            fn drop(&mut self) {
+                drop(self.take());
+            }
+        }
+
+        #[doc = concat!("Creates an empty vector of [`", $c_ty, "`].
 
 # Example
 
@@ -18,31 +126,89 @@ macro_rules! wasm_declare_vec_inner {
 # #include \"tests/wasmer.h\"
 #
 int main() {
-    // Creates an empty vector of `" $prefix "_" $name "_t`.
+    // Creates an empty vector of `", $c_ty, "`.
-    " $prefix "_" $name "_vec_t vector;
+    ", stringify!($name), " vector;
-    " $prefix "_" $name "_vec_new_empty(&vector);
+    ", stringify!($empty), "(&vector);
 
     // Check that it is empty.
     assert(vector.size == 0);
 
     // Free it.
-    " $prefix "_" $name "_vec_delete(&vector);
+    ", stringify!($delete), "(&vector);
+
+    return 0;
 }
 #    })
 #    .success();
 # }
-```"]
+```")]
-            #[no_mangle]
+        #[no_mangle]
-            pub unsafe extern "C" fn [<$prefix _ $name _vec_new_empty>](out: *mut [<$prefix _ $name _vec_t>]) {
+        pub extern "C" fn $empty(out: &mut $name) {
-                // TODO: actually implement this
+            out.size = 0;
-                [<$prefix _ $name _vec_new_uninitialized>](out, 0);
+            out.data = std::ptr::null_mut();
-            }
         }
-    }
+
+        #[doc = concat!("Creates a new uninitialized vector of [`", $c_ty, "`].
+
+# Example
+
+```rust
+# use inline_c::assert_c;
+# fn main() {
+#    (assert_c! {
+# #include \"tests/wasmer.h\"
+#
+int main() {
+    // Creates an empty vector of `", $c_ty, "`.
+    ", stringify!($name), " vector;
+    ", stringify!($uninit), "(&vector, 3);
+
+    // Check that it contains 3 items.
+    assert(vector.size == 3);
+
+    // Free it.
+    ", stringify!($delete), "(&vector);
+
+    return 0;
+}
+#    })
+#    .success();
+# }
+```")]
+        #[no_mangle]
+        pub extern "C" fn $uninit(out: &mut $name, size: usize) {
+            out.set_buffer(vec![Default::default(); size]);
+        }
+
+        #[doc = concat!("Creates a new vector of [`", $c_ty, "`].
+
+# Example
+
+See the [`", stringify!($name), "`] type to get an example.")]
+        #[no_mangle]
+        pub unsafe extern "C" fn $new(out: &mut $name, size: usize, ptr: *const $elem_ty) {
+            let vec = (0..size).map(|i| ptr.add(i).read()).collect();
+            out.set_buffer(vec);
+        }
+
+        #[doc = concat!("Performs a deep copy of a vector of [`", $c_ty, "`].")]
+        #[no_mangle]
+        pub extern "C" fn $copy(out: &mut $name, src: &$name) {
+            out.set_buffer(src.as_slice().to_vec());
+        }
+
+        #[doc = concat!("Deletes a vector of [`", $c_ty, "`].
+
+# Example
+
+See the [`", stringify!($name), "`] type to get an example.")]
+        #[no_mangle]
+        pub extern "C" fn $delete(out: &mut $name) {
+            out.take();
+        }
+    };
 }
 
-#[doc(hidden)]
-#[macro_export]
 macro_rules! wasm_declare_vec {
     ($name:ident) => {
         wasm_declare_vec!($name, wasm);
@@ -50,218 +216,25 @@ macro_rules! wasm_declare_vec {
 
     ($name:ident, $prefix:ident) => {
         paste::paste! {
-            #[doc = "Represents a vector of `" $prefix "_" $name "_t`.
+            wasm_declare_vec_inner!(
-
+                name: [<$prefix _ $name _vec_t>],
-Read the documentation of [`" $prefix "_" $name "_t`] to see more concrete examples.
+                ty: [<$prefix _ $name _t>],
-
+                c_ty: stringify!([<$prefix _ $name _t>]),
-# Example
+                c_val: concat!("({ ",
-
+                    stringify!([<$prefix _ $name _t>]), " foo;\n",
-```rust
+                    "memset(&foo, 0, sizeof(foo));\n",
-# use inline_c::assert_c;
+                    "foo;\n",
-# fn main() {
+                "})"),
-#    (assert_c! {
+                new: [<$prefix _ $name _vec_new>],
-# #include \"tests/wasmer.h\"
+                empty: [<$prefix _ $name _vec_new_empty>],
-#
+                uninit: [<$prefix _ $name _vec_new_uninitialized>],
-int main() {
+                copy: [<$prefix _ $name _vec_copy>],
-    // Create a vector of 2 `" $prefix "_" $name "_t`.
+                delete: [<$prefix _ $name _vec_delete>],
-    " $prefix "_" $name "_t x;
+            );
-    " $prefix "_" $name "_t y;
-    " $prefix "_" $name "_t* items[2] = {&x, &y};
-
-    " $prefix "_" $name "_vec_t vector;
-    " $prefix "_" $name "_vec_new(&vector, 2, (" $prefix "_" $name "_t*) items);
-
-    // Check that it contains 2 items.
-    assert(vector.size == 2);
-
-    // Free it.
-    " $prefix "_" $name "_vec_delete(&vector);
-}
-#    })
-#    .success();
-# }
-```"]
-            #[derive(Debug)]
-            #[repr(C)]
-            pub struct [<$prefix _ $name _vec_t>] {
-                pub size: usize,
-                pub data: *mut [<$prefix _ $name _t>],
-            }
-
-            impl Clone for [<$prefix _ $name _vec_t>] {
-                fn clone(&self) -> Self {
-                    if self.data.is_null() {
-                        return Self {
-                            size: self.size,
-                            data: ::std::ptr::null_mut(),
-                        };
-                    }
-                    let data =
-                        unsafe {
-                            let vec = Vec::from_raw_parts(self.data, self.size, self.size);
-                            let mut vec_copy = vec.clone().into_boxed_slice();
-                            let new_ptr = vec_copy.as_mut_ptr();
-
-                            ::std::mem::forget(vec);
-                            ::std::mem::forget(vec_copy);
-
-                            new_ptr
-                        };
-
-                    Self {
-                        size: self.size,
-                        data,
-                    }
-                }
-            }
-
-            impl<'a> From<Vec<[<$prefix _ $name _t>]>> for [<$prefix _ $name _vec_t>] {
-                fn from(mut vec: Vec<[<$prefix _ $name _t>]>) -> Self {
-                    vec.shrink_to_fit();
-
-                    let length = vec.len();
-                    let pointer = vec.as_mut_ptr();
-
-                    ::std::mem::forget(vec);
-
-                    Self {
-                        size: length,
-                        data: pointer,
-                    }
-                }
-            }
-
-            impl<'a, T: Into<[<$prefix _ $name _t>]> + Clone> From<&'a [T]> for [<$prefix _ $name _vec_t>] {
-                fn from(other: &'a [T]) -> Self {
-                    let size = other.len();
-                    let mut copied_data = other
-                        .iter()
-                        .cloned()
-                        .map(Into::into)
-                        .collect::<Vec<[<$prefix _ $name _t>]>>()
-                        .into_boxed_slice();
-                    let data = copied_data.as_mut_ptr();
-                    ::std::mem::forget(copied_data);
-
-                    Self {
-                        size,
-                        data,
-                    }
-                }
-            }
-
-            impl [<$prefix _ $name _vec_t>] {
-                pub unsafe fn into_slice(&self) -> Option<&[[<$prefix _ $name _t>]]>{
-                    if self.is_uninitialized() {
-                        return None;
-                    }
-
-                    Some(::std::slice::from_raw_parts(self.data, self.size))
-                }
-
-                pub unsafe fn into_slice_mut(&mut self) -> Option<&mut [[<$prefix _ $name _t>]]>{
-                    if self.is_uninitialized() {
-                        return None;
-                    }
-
-                    Some(::std::slice::from_raw_parts_mut(self.data, self.size))
-                }
-
-                pub fn is_uninitialized(&self) -> bool {
-                    self.data.is_null()
-                }
-            }
-
-            // TODO: investigate possible memory leak on `init` (owned pointer)
-            #[doc = "Creates a new vector of [`" $prefix "_" $name "_t`].
-
-# Example
-
-See the [`" $prefix "_" $name "_vec_t`] type to get an example."]
-            #[no_mangle]
-            pub unsafe extern "C" fn [<$prefix _ $name _vec_new>](out: *mut [<$prefix _ $name _vec_t>], length: usize, init: *mut [<$prefix _ $name _t>]) {
-                let mut bytes: Vec<[<$prefix _ $name _t>]> = Vec::with_capacity(length);
-
-                for i in 0..length {
-                    bytes.push(::std::ptr::read(init.add(i)));
-                }
-
-                let pointer = bytes.as_mut_ptr();
-                debug_assert!(bytes.len() == bytes.capacity());
-
-                (*out).data = pointer;
-                (*out).size = length;
-                ::std::mem::forget(bytes);
-            }
-
-            #[doc = "Creates a new uninitialized vector of [`" $prefix "_" $name "_t`].
-
-# Example
-
-```rust
-# use inline_c::assert_c;
-# fn main() {
-#    (assert_c! {
-# #include \"tests/wasmer.h\"
-#
-int main() {
-    // Creates an empty vector of `" $prefix "_" $name "_t`.
-    " $prefix "_" $name "_vec_t vector;
-    " $prefix "_" $name "_vec_new_uninitialized(&vector, 3);
-
-    // Check that it contains 3 items.
-    assert(vector.size == 3);
-
-    // Free it.
-    " $prefix "_" $name "_vec_delete(&vector);
-}
-#    })
-#    .success();
-# }
-```"]
-            #[no_mangle]
-            pub unsafe extern "C" fn [<$prefix _ $name _vec_new_uninitialized>](out: *mut [<$prefix _ $name _vec_t>], length: usize) {
-                let mut bytes: Vec<[<$prefix _ $name _t>]> = Vec::with_capacity(length);
-                let pointer = bytes.as_mut_ptr();
-
-                (*out).data = pointer;
-                (*out).size = length;
-
-                ::std::mem::forget(bytes);
-            }
-
-            #[doc = "Performs a deep copy of a vector of [`" $prefix "_" $name "_t`]."]
-            #[no_mangle]
-            pub unsafe extern "C" fn [<$prefix _ $name _vec_copy>](
-                out_ptr: &mut [<$prefix _ $name _vec_t>],
-                in_ptr: & [<wasm _$name _vec_t>])
-            {
-                *out_ptr = in_ptr.clone();
-            }
-
-            #[doc = "Deletes a vector of [`" $prefix "_" $name "_t`].
-
-# Example
-
-See the [`" $prefix "_" $name "_vec_t`] type to get an example."]
-            #[no_mangle]
-            pub unsafe extern "C" fn [<$prefix _ $name _vec_delete>](ptr: Option<&mut [<$prefix _ $name _vec_t>]>) {
-                if let Some(vec) = ptr {
-                    if !vec.data.is_null() {
-                        Vec::from_raw_parts(vec.data, vec.size, vec.size);
-                        vec.data = ::std::ptr::null_mut();
-                        vec.size = 0;
-                    }
-                }
-            }
         }
-
-        wasm_declare_vec_inner!($name, $prefix);
     };
 }
 
-#[doc(hidden)]
-#[macro_export]
 macro_rules! wasm_declare_boxed_vec {
     ($name:ident) => {
         wasm_declare_boxed_vec!($name, wasm);
@@ -269,223 +242,60 @@ macro_rules! wasm_declare_boxed_vec {
 
     ($name:ident, $prefix:ident) => {
         paste::paste! {
-            #[doc = "Represents a vector of `" $prefix "_" $name "_t`.
+            wasm_declare_vec_inner!(
-
+                name: [<$prefix _ $name _vec_t>],
-Read the documentation of [`" $prefix "_" $name "_t`] to see more concrete examples."]
+                ty: Option<Box<[<$prefix _ $name _t>]>>,
-            #[derive(Debug)]
+                c_ty: stringify!([<$prefix _ $name _t>] *),
-            #[repr(C)]
+                c_val: "NULL",
-            pub struct [<$prefix _ $name _vec_t>] {
+                new: [<$prefix _ $name _vec_new>],
-                pub size: usize,
+                empty: [<$prefix _ $name _vec_new_empty>],
-                pub data: *mut *mut [<$prefix _ $name _t>],
+                uninit: [<$prefix _ $name _vec_new_uninitialized>],
-            }
+                copy: [<$prefix _ $name _vec_copy>],
-
+                delete: [<$prefix _ $name _vec_delete>],
-            impl Clone for [<$prefix _ $name _vec_t>] {
+            );
-                fn clone(&self) -> Self {
-                    if self.data.is_null() {
-                        return Self {
-                            size: self.size,
-                            data: ::std::ptr::null_mut(),
-                        };
-                    }
-                    let data =
-                        unsafe {
-                            let data: *mut Option<Box<[<$prefix _ $name _t>]>> = self.data as _;
-                            let vec = Vec::from_raw_parts(data, self.size, self.size);
-                            let mut vec_copy = vec.clone().into_boxed_slice();
-                            let new_ptr = vec_copy.as_mut_ptr() as *mut *mut [<$prefix _ $name _t>];
-
-                            ::std::mem::forget(vec);
-                            ::std::mem::forget(vec_copy);
-
-                            new_ptr
-                        };
-
-                    Self {
-                        size: self.size,
-                        data,
-                    }
-                }
-            }
-
-            impl<'a> From<Vec<Box<[<$prefix _ $name _t>]>>> for [<$prefix _ $name _vec_t>] {
-                fn from(other: Vec<Box<[<$prefix _ $name _t>]>>) -> Self {
-                    let boxed_slice: Box<[Box<[<$prefix _ $name _t>]>]> = other.into_boxed_slice();
-                    let mut boxed_slice: Box<[*mut [<$prefix _ $name _t>]]> = unsafe { ::std::mem::transmute(boxed_slice) };
-                    let size = boxed_slice.len();
-                    let data = boxed_slice.as_mut_ptr();
-
-                    ::std::mem::forget(boxed_slice);
-                    Self {
-                        size,
-                        data,
-                    }
-                }
-            }
-
-            impl<'a, T: Into<[<$prefix _ $name _t>]> + Clone> From<&'a [T]> for [<$prefix _ $name _vec_t>] {
-                fn from(other: &'a [T]) -> Self {
-                    let size = other.len();
-                    let mut copied_data = other
-                        .iter()
-                        .cloned()
-                        .map(Into::into)
-                        .map(Box::new)
-                        .map(Box::into_raw)
-                        .collect::<Vec<*mut [<$prefix _ $name _t>]>>()
-                        .into_boxed_slice();
-                    let data = copied_data.as_mut_ptr();
-                    ::std::mem::forget(copied_data);
-
-                    Self {
-                        size,
-                        data,
-                    }
-                }
-            }
-
-            // TODO: do this properly
-            impl [<$prefix _ $name _vec_t>] {
-                pub unsafe fn into_slice(&self) -> Option<&[Box<[<$prefix _ $name _t>]>]>{
-                    if self.data.is_null() {
-                        return None;
-                    }
-
-                    let slice: &[*mut [<$prefix _ $name _t>]] = ::std::slice::from_raw_parts(self.data, self.size);
-                    let slice: &[Box<[<$prefix _ $name _t>]>] = ::std::mem::transmute(slice);
-                    Some(slice)
-                }
-            }
-
-            // TODO: investigate possible memory leak on `init` (owned pointer)
-            #[doc = "Creates a new vector of [`" $prefix "_" $name "_t`]."]
-            #[no_mangle]
-            pub unsafe extern "C" fn [<$prefix _ $name _vec_new>](out: *mut [<$prefix _ $name _vec_t>], length: usize, init: *const *mut [<$prefix _ $name _t>]) {
-                let mut bytes: Vec<*mut [<$prefix _ $name _t>]> = Vec::with_capacity(length);
-
-                for i in 0..length {
-                    bytes.push(*init.add(i));
-                }
-
-                let mut boxed_vec = bytes.into_boxed_slice();
-                let pointer = boxed_vec.as_mut_ptr();
-
-                (*out).data = pointer;
-                (*out).size = length;
-
-                ::std::mem::forget(boxed_vec);
-            }
-
-            #[doc = "Creates a new uninitialized vector of [`" $prefix "_" $name "_t`].
-
-# Example
-
-```rust
-# use inline_c::assert_c;
-# fn main() {
-#    (assert_c! {
-# #include \"tests/wasmer.h\"
-#
-int main() {
-    // Creates an empty vector of `" $prefix "_" $name "_t`.
-    " $prefix "_" $name "_vec_t vector;
-    " $prefix "_" $name "_vec_new_uninitialized(&vector, 3);
-
-    // Check that it contains 3 items.
-    assert(vector.size == 3);
-
-    // Free it.
-    " $prefix "_" $name "_vec_delete(&vector);
-}
-#    })
-#    .success();
-# }
-```"]
-            #[no_mangle]
-            pub unsafe extern "C" fn [<$prefix _ $name _vec_new_uninitialized>](out: *mut [<$prefix _ $name _vec_t>], length: usize) {
-                let mut bytes: Vec<*mut [<$prefix _ $name _t>]> = vec![::std::ptr::null_mut(); length];
-                let pointer = bytes.as_mut_ptr();
-
-                (*out).data = pointer;
-                (*out).size = length;
-
-                ::std::mem::forget(bytes);
-            }
-
-            #[doc = "Performs a deep copy of a vector of [`" $prefix "_" $name "_t`]."]
-            #[no_mangle]
-            pub unsafe extern "C" fn [<$prefix _ $name _vec_copy>](
-                out_ptr: &mut [<$prefix _ $name _vec_t>],
-                in_ptr: & [<$prefix _ $name _vec_t>])
-            {
-                *out_ptr = in_ptr.clone();
-            }
-
-            #[doc = "Deletes a vector of [`" $prefix "_" $name "_t`].
-
-# Example
-
-See the [`" $prefix "_" $name "_vec_t`] type to get an example."]
-            #[no_mangle]
-            pub unsafe extern "C" fn [<$prefix _ $name _vec_delete>](ptr: Option<&mut [<$prefix _ $name _vec_t>]>) {
-               if let Some(vec) = ptr {
-                    if !vec.data.is_null() {
-                        let data = vec.data as *mut Option<Box<[<$prefix _ $name _t>]>>;
-                        let _data: Vec<Option<Box<[<$prefix _ $name _t>]>>> = Vec::from_raw_parts(data, vec.size, vec.size);
-
-                        vec.data = ::std::ptr::null_mut();
-                        vec.size = 0;
-                    }
-                }
-            }
-        }
-
-        wasm_declare_vec_inner!($name, $prefix);
-    };
-}
-
-#[doc(hidden)]
-#[macro_export]
-macro_rules! wasm_declare_ref_base {
-    ($name:ident) => {
-        wasm_declare_ref_base!($name, wasm);
-    };
-
-    ($name:ident, $prefix:ident) => {
-        wasm_declare_own!($name, $prefix);
-
-        paste::paste! {
-            #[no_mangle]
-            pub extern "C" fn [<$prefix _ $name _copy>](_arg: *const [<$prefix _ $name _t>]) -> *mut [<$prefix _ $name _t>] {
-                todo!("in generated declare ref base");
-                //ptr::null_mut()
-            }
-
-            // TODO: finish this...
         }
     };
 }
 
-#[doc(hidden)]
+macro_rules! wasm_impl_copy {
-#[macro_export]
-macro_rules! wasm_declare_own {
     ($name:ident) => {
-        wasm_declare_own!($name, $prefix);
+        wasm_impl_copy!($name, wasm);
     };
 
     ($name:ident, $prefix:ident) => {
         paste::paste! {
-            #[repr(C)]
-            pub struct [<$prefix _ $name _t>] {}
-
             #[no_mangle]
-            pub extern "C" fn [<$prefix _ $name _delete>](_arg: *mut [<$prefix _ $name _t>]) {
+            pub extern "C" fn [<$prefix _ $name _copy>](src: Option<&[<$prefix _ $name _t>]>) -> Option<Box<[<$prefix _ $name _t>]>> {
-                todo!("in generated delete")
+                Some(Box::new(src?.clone()))
             }
         }
     };
 }
 
-#[macro_export]
+macro_rules! wasm_impl_delete {
+    ($name:ident) => {
+        wasm_impl_delete!($name, wasm);
+    };
+
+    ($name:ident, $prefix:ident) => {
+        paste::paste! {
+            #[no_mangle]
+            pub extern "C" fn [<$prefix _ $name _delete>](_: Option<Box<[<$prefix _ $name _t>]>>) {}
+        }
+    };
+}
+
+macro_rules! wasm_impl_copy_delete {
+    ($name:ident) => {
+        wasm_impl_copy_delete!($name, wasm);
+    };
+
+    ($name:ident, $prefix:ident) => {
+        wasm_impl_copy!($name, $prefix);
+        wasm_impl_delete!($name, $prefix);
+    };
+}
+
 macro_rules! c_try {
     ($expr:expr; otherwise $return:expr) => {{
         let res: Result<_, _> = $expr;

lib/c-api/src/wasm_c_api/mod.rs

@@ -23,7 +23,7 @@
 
 /// Private Rust macros.
 #[macro_use]
-pub mod macros;
+mod macros;
 
 /// An engine drives the compilation and the runtime.
 ///

lib/c-api/src/wasm_c_api/module.rs

@@ -1,9 +1,6 @@
 use super::store::wasm_store_t;
-use super::types::{
+use super::types::{wasm_byte_vec_t, wasm_exporttype_vec_t, wasm_importtype_vec_t};
-    wasm_byte_vec_t, wasm_exporttype_t, wasm_exporttype_vec_t, wasm_importtype_t,
+use crate::error::update_last_error;
-    wasm_importtype_vec_t,
-};
-use crate::error::{update_last_error, CApiError};
 use std::ptr::NonNull;
 use std::sync::Arc;
 use wasmer_api::Module;
@@ -36,8 +33,7 @@ pub unsafe extern "C" fn wasm_module_new(
     let store = store?;
     let bytes = bytes?;
 
-    let bytes = bytes.into_slice()?;
+    let module = c_try!(Module::from_binary(&store.inner, bytes.as_slice()));
-    let module = c_try!(Module::from_binary(&store.inner, bytes));
 
     Some(Box::new(wasm_module_t {
         inner: Arc::new(module),
@@ -107,12 +103,7 @@ pub unsafe extern "C" fn wasm_module_validate(
         None => return false,
     };
 
-    let bytes = match bytes.into_slice() {
+    if let Err(error) = Module::validate(&store.inner, bytes.as_slice()) {
-        Some(bytes) => bytes,
-        None => return false,
-    };
-
-    if let Err(error) = Module::validate(&store.inner, bytes) {
         update_last_error(error);
 
         false
@@ -238,11 +229,10 @@ pub unsafe extern "C" fn wasm_module_exports(
     let exports = module
         .inner
         .exports()
-        .map(Into::into)
+        .map(|export| Some(Box::new(export.into())))
-        .map(Box::new)
+        .collect();
-        .collect::<Vec<Box<wasm_exporttype_t>>>();
 
-    *out = exports.into();
+    out.set_buffer(exports);
 }
 
 /// Returns an array of the imported types in the module.
@@ -379,11 +369,10 @@ pub unsafe extern "C" fn wasm_module_imports(
     let imports = module
         .inner
         .imports()
-        .map(Into::into)
+        .map(|import| Some(Box::new(import.into())))
-        .map(Box::new)
+        .collect();
-        .collect::<Vec<Box<wasm_importtype_t>>>();
 
-    *out = imports.into();
+    out.set_buffer(imports);
 }
 
 /// Deserializes a serialized module binary into a `wasm_module_t`.
@@ -472,21 +461,11 @@ pub unsafe extern "C" fn wasm_module_imports(
 #[no_mangle]
 pub unsafe extern "C" fn wasm_module_deserialize(
     store: &wasm_store_t,
-    bytes: *const wasm_byte_vec_t,
+    bytes: Option<&wasm_byte_vec_t>,
 ) -> Option<NonNull<wasm_module_t>> {
-    // TODO: read config from store and use that to decide which compiler to use
+    let bytes = bytes?;
 
-    let byte_slice = if bytes.is_null() || (&*bytes).into_slice().is_none() {
+    let module = c_try!(Module::deserialize(&store.inner, bytes.as_slice()));
-        update_last_error(CApiError {
-            msg: "`bytes` is null or represents an empty slice".to_string(),
-        });
-
-        return None;
-    } else {
-        (&*bytes).into_slice().unwrap()
-    };
-
-    let module = c_try!(Module::deserialize(&store.inner, byte_slice));
 
     Some(NonNull::new_unchecked(Box::into_raw(Box::new(
         wasm_module_t {
@@ -503,10 +482,7 @@ pub unsafe extern "C" fn wasm_module_deserialize(
 ///
 /// See [`wasm_module_deserialize`].
 #[no_mangle]
-pub unsafe extern "C" fn wasm_module_serialize(
+pub unsafe extern "C" fn wasm_module_serialize(module: &wasm_module_t, out: &mut wasm_byte_vec_t) {
-    module: &wasm_module_t,
-    out_ptr: &mut wasm_byte_vec_t,
-) {
     let byte_vec = match module.inner.serialize() {
         Ok(byte_vec) => byte_vec,
         Err(err) => {
@@ -514,7 +490,7 @@ pub unsafe extern "C" fn wasm_module_serialize(
             return;
         }
     };
-    *out_ptr = byte_vec.into();
+    out.set_buffer(byte_vec);
 }
 
 #[cfg(test)]

lib/c-api/src/wasm_c_api/trap.rs

@@ -28,7 +28,7 @@ pub unsafe extern "C" fn wasm_trap_new(
     _store: &mut wasm_store_t,
     message: &wasm_message_t,
 ) -> Option<Box<wasm_trap_t>> {
-    let message_bytes = message.into_slice()?;
+    let message_bytes = message.as_slice();
 
     // The trap message is typed with `wasm_message_t` which is a
     // typeref to `wasm_name_t` with the exception that it's a
@@ -117,10 +117,7 @@ pub unsafe extern "C" fn wasm_trap_message(
     let mut byte_vec = message.into_bytes();
     byte_vec.push(0);
 
-    let byte_vec: wasm_byte_vec_t = byte_vec.into();
+    out.set_buffer(byte_vec);
-
-    out.size = byte_vec.size;
-    out.data = byte_vec.data;
 }
 
 /// Gets the origin frame attached to the trap.
@@ -137,10 +134,12 @@ pub unsafe extern "C" fn wasm_trap_trace(
     out: &mut wasm_frame_vec_t,
 ) {
     let frames = trap.inner.trace();
-    let frame_vec: wasm_frame_vec_t = frames.into();
+    out.set_buffer(
-
+        frames
-    out.size = frame_vec.size;
+            .iter()
-    out.data = frame_vec.data;
+            .map(|frame| Some(Box::new(frame.into())))
+            .collect(),
+    );
 }
 
 #[cfg(test)]

lib/c-api/src/wasm_c_api/types/export.rs

@@ -1,40 +1,37 @@
-use super::{owned_wasm_name_t, wasm_externtype_t, wasm_name_t};
+use super::{wasm_externtype_t, wasm_name_t};
 use wasmer_api::ExportType;
 
 #[allow(non_camel_case_types)]
 #[derive(Clone)]
 pub struct wasm_exporttype_t {
-    name: owned_wasm_name_t,
+    name: wasm_name_t,
-    extern_type: Box<wasm_externtype_t>,
+    extern_type: wasm_externtype_t,
 }
 
 wasm_declare_boxed_vec!(exporttype);
+wasm_impl_copy_delete!(exporttype);
 
 #[no_mangle]
 pub extern "C" fn wasm_exporttype_new(
-    name: Option<&wasm_name_t>,
+    name: &wasm_name_t,
-    extern_type: Option<Box<wasm_externtype_t>>,
+    extern_type: Box<wasm_externtype_t>,
-) -> Option<Box<wasm_exporttype_t>> {
+) -> Box<wasm_exporttype_t> {
-    let name = unsafe { owned_wasm_name_t::new(name?) };
+    Box::new(wasm_exporttype_t {
-    Some(Box::new(wasm_exporttype_t {
+        name: name.clone(),
-        name,
+        extern_type: *extern_type,
-        extern_type: extern_type?,
+    })
-    }))
 }
 
 #[no_mangle]
 pub extern "C" fn wasm_exporttype_name(export_type: &wasm_exporttype_t) -> &wasm_name_t {
-    export_type.name.as_ref()
+    &export_type.name
 }
 
 #[no_mangle]
 pub extern "C" fn wasm_exporttype_type(export_type: &wasm_exporttype_t) -> &wasm_externtype_t {
-    export_type.extern_type.as_ref()
+    &export_type.extern_type
 }
 
-#[no_mangle]
-pub extern "C" fn wasm_exporttype_delete(_export_type: Option<Box<wasm_exporttype_t>>) {}
-
 impl From<ExportType> for wasm_exporttype_t {
     fn from(other: ExportType) -> Self {
         (&other).into()
@@ -43,8 +40,8 @@ impl From<ExportType> for wasm_exporttype_t {
 
 impl From<&ExportType> for wasm_exporttype_t {
     fn from(other: &ExportType) -> Self {
-        let name: owned_wasm_name_t = other.name().to_string().into();
+        let name: wasm_name_t = other.name().to_string().into();
-        let extern_type: Box<wasm_externtype_t> = Box::new(other.ty().into());
+        let extern_type: wasm_externtype_t = other.ty().into();
 
         wasm_exporttype_t { name, extern_type }
     }

lib/c-api/src/wasm_c_api/types/function.rs

@@ -1,22 +1,30 @@
-use super::{wasm_externtype_t, wasm_valtype_vec_delete, wasm_valtype_vec_t, WasmExternType};
+use super::{wasm_externtype_t, wasm_valtype_vec_t, WasmExternType};
+use std::fmt;
 use wasmer_api::{ExternType, FunctionType, ValType};
 
-#[derive(Debug)]
 pub(crate) struct WasmFunctionType {
     pub(crate) function_type: FunctionType,
-    params: Box<wasm_valtype_vec_t>,
+    params: wasm_valtype_vec_t,
-    results: Box<wasm_valtype_vec_t>,
+    results: wasm_valtype_vec_t,
 }
 
 impl WasmFunctionType {
     pub(crate) fn new(function_type: FunctionType) -> Self {
-        let params: Box<wasm_valtype_vec_t> = Box::new(function_type.params().into());
+        let params: Vec<_> = function_type
-        let results: Box<wasm_valtype_vec_t> = Box::new(function_type.results().into());
+            .params()
+            .iter()
+            .map(|&valtype| Some(Box::new(valtype.into())))
+            .collect();
+        let results: Vec<_> = function_type
+            .results()
+            .iter()
+            .map(|&valtype| Some(Box::new(valtype.into())))
+            .collect();
 
         Self {
             function_type,
-            params,
+            params: params.into(),
-            results,
+            results: results.into(),
         }
     }
 }
@@ -27,6 +35,12 @@ impl Clone for WasmFunctionType {
     }
 }
 
+impl fmt::Debug for WasmFunctionType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.function_type.fmt(f)
+    }
+}
+
 #[allow(non_camel_case_types)]
 #[derive(Debug, Clone)]
 #[repr(transparent)]
@@ -52,6 +66,7 @@ impl wasm_functype_t {
 }
 
 wasm_declare_boxed_vec!(functype);
+wasm_impl_copy_delete!(functype);
 
 #[no_mangle]
 pub unsafe extern "C" fn wasm_functype_new(
@@ -62,44 +77,29 @@ pub unsafe extern "C" fn wasm_functype_new(
     let results = results?;
 
     let params_as_valtype: Vec<ValType> = params
-        .into_slice()?
+        .take()
         .into_iter()
-        .map(|val| val.as_ref().into())
+        .map(|val| val.as_ref().unwrap().as_ref().into())
         .collect::<Vec<_>>();
     let results_as_valtype: Vec<ValType> = results
-        .into_slice()?
+        .take()
-        .iter()
+        .into_iter()
-        .map(|val| val.as_ref().into())
+        .map(|val| val.as_ref().unwrap().as_ref().into())
         .collect::<Vec<_>>();
 
-    wasm_valtype_vec_delete(Some(params));
-    wasm_valtype_vec_delete(Some(results));
-
     Some(Box::new(wasm_functype_t::new(FunctionType::new(
         params_as_valtype,
         results_as_valtype,
     ))))
 }
 
-#[no_mangle]
-pub unsafe extern "C" fn wasm_functype_delete(_function_type: Option<Box<wasm_functype_t>>) {}
-
-#[no_mangle]
-pub unsafe extern "C" fn wasm_functype_copy(
-    function_type: Option<&wasm_functype_t>,
-) -> Option<Box<wasm_functype_t>> {
-    let function_type = function_type?;
-
-    Some(Box::new(function_type.clone()))
-}
-
 #[no_mangle]
 pub unsafe extern "C" fn wasm_functype_params(
     function_type: Option<&wasm_functype_t>,
 ) -> Option<&wasm_valtype_vec_t> {
     let function_type = function_type?;
 
-    Some(function_type.inner().params.as_ref())
+    Some(&function_type.inner().params)
 }
 
 #[no_mangle]
@@ -108,5 +108,5 @@ pub unsafe extern "C" fn wasm_functype_results(
 ) -> Option<&wasm_valtype_vec_t> {
     let function_type = function_type?;
 
-    Some(function_type.inner().results.as_ref())
+    Some(&function_type.inner().results)
 }

lib/c-api/src/wasm_c_api/types/global.rs

@@ -8,12 +8,12 @@ use wasmer_api::{ExternType, GlobalType};
 #[derive(Debug, Clone)]
 pub(crate) struct WasmGlobalType {
     pub(crate) global_type: GlobalType,
-    content: Box<wasm_valtype_t>,
+    content: wasm_valtype_t,
 }
 
 impl WasmGlobalType {
     pub(crate) fn new(global_type: GlobalType) -> Self {
-        let content = Box::new(global_type.ty.into());
+        let content = global_type.ty.into();
 
         Self {
             global_type,
@@ -79,5 +79,5 @@ pub unsafe extern "C" fn wasm_globaltype_mutability(
 pub unsafe extern "C" fn wasm_globaltype_content(
     global_type: &wasm_globaltype_t,
 ) -> &wasm_valtype_t {
-    global_type.inner().content.as_ref()
+    &global_type.inner().content
 }

lib/c-api/src/wasm_c_api/types/import.rs

@@ -1,49 +1,43 @@
-use super::{owned_wasm_name_t, wasm_externtype_t, wasm_name_t};
+use super::{wasm_externtype_t, wasm_name_t};
 use wasmer_api::ImportType;
 
 #[allow(non_camel_case_types)]
 #[derive(Clone)]
 #[repr(C)]
 pub struct wasm_importtype_t {
-    module: owned_wasm_name_t,
+    module: wasm_name_t,
-    name: owned_wasm_name_t,
+    name: wasm_name_t,
-    extern_type: Box<wasm_externtype_t>,
+    extern_type: wasm_externtype_t,
 }
 
 wasm_declare_boxed_vec!(importtype);
 
 #[no_mangle]
 pub extern "C" fn wasm_importtype_new(
-    module: Option<&wasm_name_t>,
+    module: Option<Box<wasm_name_t>>,
-    name: Option<&wasm_name_t>,
+    name: Option<Box<wasm_name_t>>,
     extern_type: Option<Box<wasm_externtype_t>>,
 ) -> Option<Box<wasm_importtype_t>> {
-    let (module, name) = unsafe {
-        (
-            owned_wasm_name_t::new(module?),
-            owned_wasm_name_t::new(name?),
-        )
-    };
     Some(Box::new(wasm_importtype_t {
-        name,
+        name: *name?,
-        module,
+        module: *module?,
-        extern_type: extern_type?,
+        extern_type: *extern_type?,
     }))
 }
 
 #[no_mangle]
 pub extern "C" fn wasm_importtype_module(import_type: &wasm_importtype_t) -> &wasm_name_t {
-    import_type.module.as_ref()
+    &import_type.module
 }
 
 #[no_mangle]
 pub extern "C" fn wasm_importtype_name(import_type: &wasm_importtype_t) -> &wasm_name_t {
-    import_type.name.as_ref()
+    &import_type.name
 }
 
 #[no_mangle]
 pub extern "C" fn wasm_importtype_type(import_type: &wasm_importtype_t) -> &wasm_externtype_t {
-    import_type.extern_type.as_ref()
+    &import_type.extern_type
 }
 
 #[no_mangle]
@@ -57,9 +51,9 @@ impl From<ImportType> for wasm_importtype_t {
 
 impl From<&ImportType> for wasm_importtype_t {
     fn from(other: &ImportType) -> Self {
-        let module: owned_wasm_name_t = other.module().to_string().into();
+        let module: wasm_name_t = other.module().to_string().into();
-        let name: owned_wasm_name_t = other.name().to_string().into();
+        let name: wasm_name_t = other.name().to_string().into();
-        let extern_type: Box<wasm_externtype_t> = Box::new(other.ty().into());
+        let extern_type: wasm_externtype_t = other.ty().into();
 
         wasm_importtype_t {
             module,

lib/c-api/src/wasm_c_api/types/memory.rs

@@ -4,18 +4,18 @@ use wasmer_api::{ExternType, MemoryType, Pages};
 #[derive(Debug, Clone)]
 pub(crate) struct WasmMemoryType {
     pub(crate) memory_type: MemoryType,
-    limits: Box<wasm_limits_t>,
+    limits: wasm_limits_t,
 }
 
 impl WasmMemoryType {
     pub(crate) fn new(memory_type: MemoryType) -> Self {
-        let limits = Box::new(wasm_limits_t {
+        let limits = wasm_limits_t {
             min: memory_type.minimum.0 as _,
             max: memory_type
                 .maximum
                 .map(|max| max.0 as _)
                 .unwrap_or(LIMITS_MAX_SENTINEL),
-        });
+        };
 
         Self {
             memory_type,
@@ -79,5 +79,5 @@ const LIMITS_MAX_SENTINEL: u32 = u32::max_value();
 
 #[no_mangle]
 pub unsafe extern "C" fn wasm_memorytype_limits(memory_type: &wasm_memorytype_t) -> &wasm_limits_t {
-    memory_type.inner().limits.as_ref()
+    &memory_type.inner().limits
 }

lib/c-api/src/wasm_c_api/types/mod.rs

@@ -28,63 +28,9 @@ wasm_declare_vec!(byte);
 #[allow(non_camel_case_types)]
 pub type wasm_name_t = wasm_byte_vec_t;
 
-impl AsRef<wasm_name_t> for wasm_name_t {
+impl From<String> for wasm_name_t {
-    fn as_ref(&self) -> &wasm_name_t {
-        &self
-    }
-}
-
-/// An owned version of `wasm_name_t`.
-///
-/// Assumes that data is either valid host-owned or null.
-// NOTE: `wasm_name_t` already does a deep copy, so we just derive `Clone` here.
-#[derive(Debug, Clone)]
-#[repr(transparent)]
-#[allow(non_camel_case_types)]
-pub struct owned_wasm_name_t(wasm_name_t);
-
-impl owned_wasm_name_t {
-    /// Take ownership of some `wasm_name_t`
-    ///
-    /// # Safety
-    /// You must ensure that the data pointed to by `wasm_name_t` is valid and
-    /// that it is not owned by anyone else.
-    pub unsafe fn new(name: &wasm_name_t) -> Self {
-        Self(wasm_name_t {
-            size: name.size,
-            data: name.data,
-        })
-    }
-}
-
-impl Drop for owned_wasm_name_t {
-    fn drop(&mut self) {
-        if !self.0.data.is_null() {
-            let _v = unsafe { Vec::from_raw_parts(self.0.data, self.0.size, self.0.size) };
-            self.0.data = std::ptr::null_mut();
-            self.0.size = 0;
-        }
-        // why can't we call this function?
-        //unsafe { crate::wasm_c_api::macros::wasm_byte_vec_delete(Some(self.0)) }
-    }
-}
-
-impl AsRef<wasm_name_t> for owned_wasm_name_t {
-    fn as_ref(&self) -> &wasm_name_t {
-        &self.0
-    }
-}
-
-impl From<String> for owned_wasm_name_t {
     fn from(string: String) -> Self {
-        let mut boxed_str: Box<str> = string.into_boxed_str();
+        string.into_bytes().into()
-        let data = boxed_str.as_mut_ptr();
-        let size = boxed_str.bytes().len();
-        let wasm_name = wasm_name_t { data, size };
-
-        Box::leak(boxed_str);
-
-        Self(wasm_name)
     }
 }
 

lib/c-api/src/wasm_c_api/types/table.rs

@@ -10,21 +10,21 @@ const LIMITS_MAX_SENTINEL: u32 = u32::max_value();
 
 #[derive(Debug, Clone)]
 pub(crate) struct WasmTableType {
-    pub(crate) table_type: TableType,
+    pub(crate) _table_type: TableType,
-    limits: Box<wasm_limits_t>,
+    limits: wasm_limits_t,
-    content: Box<wasm_valtype_t>,
+    content: wasm_valtype_t,
 }
 
 impl WasmTableType {
     pub(crate) fn new(table_type: TableType) -> Self {
-        let limits = Box::new(wasm_limits_t {
+        let limits = wasm_limits_t {
             min: table_type.minimum as _,
             max: table_type.maximum.unwrap_or(LIMITS_MAX_SENTINEL),
-        });
+        };
-        let content = Box::new(table_type.ty.into());
+        let content = table_type.ty.into();
 
         Self {
-            table_type,
+            _table_type: table_type,
             limits,
             content,
         }
@@ -79,12 +79,12 @@ pub unsafe extern "C" fn wasm_tabletype_new(
 
 #[no_mangle]
 pub unsafe extern "C" fn wasm_tabletype_limits(table_type: &wasm_tabletype_t) -> &wasm_limits_t {
-    table_type.inner().limits.as_ref()
+    &table_type.inner().limits
 }
 
 #[no_mangle]
 pub unsafe extern "C" fn wasm_tabletype_element(table_type: &wasm_tabletype_t) -> &wasm_valtype_t {
-    table_type.inner().content.as_ref()
+    &table_type.inner().content
 }
 
 #[no_mangle]

lib/c-api/src/wasm_c_api/unstable/module.rs

@@ -70,7 +70,7 @@ pub unsafe extern "C" fn wasmer_module_name(
         }
     };
 
-    *out = name.as_bytes().to_vec().into();
+    out.set_buffer(name.as_bytes().to_vec());
 }
 
 /// Unstable non-standard Wasmer-specific API to set the module's
@@ -144,12 +144,9 @@ pub unsafe extern "C" fn wasmer_module_set_name(
     // own
     name: &wasm_name_t,
 ) -> bool {
-    let name = match name.into_slice() {
+    let name = match str::from_utf8(name.as_slice()) {
-        Some(name) => match str::from_utf8(name) {
+        Ok(name) => name,
-            Ok(name) => name,
+        Err(_) => return false, // not ideal!
-            Err(_) => return false, // not ideal!
-        },
-        None => return false,
     };
 
     match Arc::get_mut(&mut module.inner) {

lib/c-api/src/wasm_c_api/unstable/target_lexicon.rs

@@ -54,7 +54,6 @@
 //! ```
 
 use super::super::types::wasm_name_t;
-use crate::error::CApiError;
 use enumset::EnumSet;
 use std::slice;
 use std::str::{self, FromStr};
@@ -153,7 +152,7 @@ pub unsafe extern "C" fn wasmer_triple_new(
     )));
 
     Some(Box::new(wasmer_triple_t {
-        inner: c_try!(Triple::from_str(triple).map_err(|e| CApiError { msg: e.to_string() })),
+        inner: c_try!(Triple::from_str(triple)),
     }))
 }
 

lib/c-api/src/wasm_c_api/unstable/wasi.rs

@@ -2,13 +2,9 @@
 //! API.
 
 use super::super::{
-    externals::wasm_extern_t,
+    externals::wasm_extern_t, module::wasm_module_t, store::wasm_store_t, types::wasm_name_t,
-    module::wasm_module_t,
-    store::wasm_store_t,
-    types::{owned_wasm_name_t, wasm_name_t},
     wasi::wasi_env_t,
 };
-use crate::error::CApiError;
 use wasmer_api::Extern;
 use wasmer_wasi::{generate_import_object_from_env, get_wasi_version};
 
@@ -22,8 +18,8 @@ use wasmer_wasi::{generate_import_object_from_env, get_wasi_version};
 #[allow(non_camel_case_types)]
 #[derive(Clone)]
 pub struct wasmer_named_extern_t {
-    module: owned_wasm_name_t,
+    module: wasm_name_t,
-    name: owned_wasm_name_t,
+    name: wasm_name_t,
     r#extern: Box<wasm_extern_t>,
 }
 
@@ -121,7 +117,7 @@ mod __cbindgen_hack__ {
 pub extern "C" fn wasmer_named_extern_module(
     named_extern: Option<&wasmer_named_extern_t>,
 ) -> Option<&wasm_name_t> {
-    Some(named_extern?.module.as_ref())
+    Some(&named_extern?.module)
 }
 
 /// Non-standard function to get the name of a `wasmer_named_extern_t`.
@@ -131,7 +127,7 @@ pub extern "C" fn wasmer_named_extern_module(
 pub extern "C" fn wasmer_named_extern_name(
     named_extern: Option<&wasmer_named_extern_t>,
 ) -> Option<&wasm_name_t> {
-    Some(named_extern?.name.as_ref())
+    Some(&named_extern?.name)
 }
 
 /// Non-standard function to get the wrapped extern of a
@@ -171,29 +167,27 @@ fn wasi_get_unordered_imports_inner(
 
     let store = &store.inner;
 
-    let version = c_try!(
+    let version = c_try!(get_wasi_version(&module.inner, false)
-        get_wasi_version(&module.inner, false).ok_or_else(|| CApiError {
+        .ok_or("could not detect a WASI version on the given module"));
-            msg: "could not detect a WASI version on the given module".to_string(),
-        })
-    );
 
     let import_object = generate_import_object_from_env(store, wasi_env.inner.clone(), version);
 
-    *imports = import_object
+    imports.set_buffer(
-        .into_iter()
+        import_object
-        .map(|((module, name), export)| {
+            .into_iter()
-            let module = module.into();
+            .map(|((module, name), export)| {
-            let name = name.into();
+                let module = module.into();
-            let extern_inner = Extern::from_vm_export(store, export);
+                let name = name.into();
+                let extern_inner = Extern::from_vm_export(store, export);
 
-            Box::new(wasmer_named_extern_t {
+                Some(Box::new(wasmer_named_extern_t {
-                module,
+                    module,
-                name,
+                    name,
-                r#extern: Box::new(extern_inner.into()),
+                    r#extern: Box::new(extern_inner.into()),
+                }))
             })
-        })
+            .collect::<Vec<_>>(),
-        .collect::<Vec<_>>()
+    );
-        .into();
 
     Some(())
 }

lib/c-api/src/wasm_c_api/value.rs

@@ -1,5 +1,5 @@
 use super::types::{wasm_ref_t, wasm_valkind_enum};
-use crate::error::{update_last_error, CApiError};
+use crate::error::update_last_error;
 use std::convert::{TryFrom, TryInto};
 use wasmer_api::Val;
 
@@ -121,6 +121,15 @@ impl Clone for wasm_val_t {
     }
 }
 
+impl Default for wasm_val_t {
+    fn default() -> Self {
+        Self {
+            kind: wasm_valkind_enum::WASM_I64 as _,
+            of: wasm_val_inner { int64_t: 0 },
+        }
+    }
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn wasm_val_copy(
     // own
@@ -147,7 +156,7 @@ pub unsafe extern "C" fn wasm_val_copy(
         },
 
         Err(e) => {
-            update_last_error(CApiError { msg: e.to_string() });
+            update_last_error(e);
 
             return;
         }

lib/c-api/src/wasm_c_api/wasi/mod.rs

@@ -11,7 +11,7 @@ use super::{
     module::wasm_module_t,
     store::wasm_store_t,
 };
-use crate::error::{update_last_error, CApiError};
+use crate::error::update_last_error;
 use std::cmp::min;
 use std::convert::TryFrom;
 use std::ffi::CStr;
@@ -212,9 +212,7 @@ pub unsafe extern "C" fn wasi_env_read_stdout(
         if let Some(stdout) = stdout.as_mut() {
             stdout
         } else {
-            update_last_error(CApiError {
+            update_last_error("could not find a file handle for `stdout`");
-                msg: "could not find a file handle for `stdout`".to_string(),
-            });
             return -1;
         }
     } else {
@@ -235,15 +233,11 @@ pub unsafe extern "C" fn wasi_env_read_stderr(
         if let Some(stderr) = stderr.as_mut() {
             stderr
         } else {
-            update_last_error(CApiError {
+            update_last_error("could not find a file handle for `stderr`");
-                msg: "could not find a file handle for `stderr`".to_string(),
-            });
             return -1;
         }
     } else {
-        update_last_error(CApiError {
+        update_last_error("could not find a file handle for `stderr`");
-            msg: "could not find a file handle for `stderr`".to_string(),
-        });
         return -1;
     };
     read_inner(stderr, inner_buffer)
@@ -348,33 +342,29 @@ fn wasi_get_imports_inner(
 
     let store = &store.inner;
 
-    let version = c_try!(
+    let version = c_try!(get_wasi_version(&module.inner, false)
-        get_wasi_version(&module.inner, false).ok_or_else(|| CApiError {
+        .ok_or("could not detect a WASI version on the given module"));
-            msg: "could not detect a WASI version on the given module".to_string(),
-        })
-    );
 
     let import_object = generate_import_object_from_env(store, wasi_env.inner.clone(), version);
 
-    *imports = module
+    imports.set_buffer(c_try!(module
         .inner
         .imports()
         .map(|import_type| {
-            let export = c_try!(import_object
+            let export = import_object
                 .resolve_by_name(import_type.module(), import_type.name())
-                .ok_or_else(|| CApiError {
+                .ok_or_else(|| {
-                    msg: format!(
+                    format!(
                         "Failed to resolve import \"{}\" \"{}\"",
                         import_type.module(),
                         import_type.name()
-                    ),
+                    )
-                }));
+                })?;
             let inner = Extern::from_vm_export(store, export);
 
-            Some(Box::new(inner.into()))
+            Ok(Some(Box::new(inner.into())))
         })
-        .collect::<Option<Vec<_>>>()?
+        .collect::<Result<Vec<_>, String>>()));
-        .into();
 
     Some(())
 }

lib/c-api/src/wasm_c_api/wat.rs

@@ -11,16 +11,8 @@ use super::types::wasm_byte_vec_t;
 #[cfg(feature = "wat")]
 #[no_mangle]
 pub unsafe extern "C" fn wat2wasm(wat: &wasm_byte_vec_t, out: &mut wasm_byte_vec_t) {
-    let wat: &[u8] = match wat.into_slice() {
+    match wasmer_api::wat2wasm(wat.as_slice()) {
-        Some(v) => v,
+        Ok(val) => out.set_buffer(val.into_owned()),
-        _ => {
-            out.data = std::ptr::null_mut();
-            out.size = 0;
-            return;
-        }
-    };
-    let result: wasm_byte_vec_t = match wasmer_api::wat2wasm(wat) {
-        Ok(val) => val.into_owned().into(),
         Err(err) => {
             crate::error::update_last_error(err);
             out.data = std::ptr::null_mut();
@@ -28,8 +20,6 @@ pub unsafe extern "C" fn wat2wasm(wat: &wasm_byte_vec_t, out: &mut wasm_byte_vec
             return;
         }
     };
-
-    *out = result;
 }
 
 #[cfg(test)]

lib/compiler-cranelift/Cargo.toml

@@ -25,9 +25,9 @@ more-asserts = "0.2"
 gimli = { version = "0.25", optional = true }
 smallvec = "1.6"
 loupe = "0.1"
+target-lexicon = { version = "0.12.2", default-features = false }
 
 [dev-dependencies]
-target-lexicon = { version = "0.12.2", default-features = false }
 cranelift-codegen = { version = "0.76", features = ["all-arch"] }
 lazy_static = "1.4"
 

lib/compiler-cranelift/src/compiler.rs

@@ -21,6 +21,7 @@ use gimli::write::{Address, EhFrame, FrameTable};
 use loupe::MemoryUsage;
 use rayon::prelude::{IntoParallelRefIterator, ParallelIterator};
 use std::sync::Arc;
+use target_lexicon::{Architecture, OperatingSystem};
 use wasmer_compiler::CompileError;
 use wasmer_compiler::{CallingConvention, ModuleTranslationState, Target};
 use wasmer_compiler::{
@@ -29,14 +30,12 @@ use wasmer_compiler::{
     FunctionBodyData, MiddlewareBinaryReader, ModuleMiddleware, ModuleMiddlewareChain,
     SectionIndex,
 };
-#[cfg(all(target_arch = "x86_64", target_os = "linux"))]
 use wasmer_compiler::{
     CustomSection, CustomSectionProtection, Relocation, RelocationKind, RelocationTarget,
     SectionBody,
 };
 use wasmer_types::entity::{EntityRef, PrimaryMap};
 use wasmer_types::{FunctionIndex, LocalFunctionIndex, SignatureIndex};
-#[cfg(all(target_arch = "x86_64", target_os = "linux"))]
 use wasmer_vm::libcalls::LibCall;
 
 /// A compiler that compiles a WebAssembly module with Cranelift, translating the Wasm to Cranelift IR,
@@ -92,14 +91,13 @@ impl Compiler for CraneliftCompiler {
             // FDEs will cause some issues in Linux.
             None
         } else {
-            use std::sync::Mutex;
             match target.triple().default_calling_convention() {
                 Ok(CallingConvention::SystemV) => {
                     match isa.create_systemv_cie() {
                         Some(cie) => {
                             let mut dwarf_frametable = FrameTable::default();
                             let cie_id = dwarf_frametable.add_cie(cie);
-                            Some((Arc::new(Mutex::new(dwarf_frametable)), cie_id))
+                            Some((dwarf_frametable, cie_id))
                         }
                         // Even though we are in a SystemV system, Cranelift doesn't support it
                         None => None,
@@ -111,30 +109,36 @@ impl Compiler for CraneliftCompiler {
 
         let mut custom_sections = PrimaryMap::new();
 
-        #[cfg(all(target_arch = "x86_64", target_os = "linux"))]
+        let probestack_trampoline_relocation_target = if target.triple().operating_system
-        let probestack_trampoline = CustomSection {
+            == OperatingSystem::Linux
-            protection: CustomSectionProtection::ReadExecute,
+            && target.triple().architecture == Architecture::X86_64
-            // We create a jump to an absolute 64bits address
+        {
-            // with an indrect jump immediatly followed but the absolute address
+            let probestack_trampoline = CustomSection {
-            // JMP [IP+0]   FF 25 00 00 00 00
+                protection: CustomSectionProtection::ReadExecute,
-            // 64bits ADDR  00 00 00 00 00 00 00 00 preset to 0 until the relocation takes place
+                // We create a jump to an absolute 64bits address
-            bytes: SectionBody::new_with_vec(vec![
+                // with an indrect jump immediatly followed but the absolute address
-                0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                // JMP [IP+0]   FF 25 00 00 00 00
-            ]),
+                // 64bits ADDR  00 00 00 00 00 00 00 00 preset to 0 until the relocation takes place
-            relocations: vec![Relocation {
+                bytes: SectionBody::new_with_vec(vec![
-                kind: RelocationKind::Abs8,
+                    0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-                reloc_target: RelocationTarget::LibCall(LibCall::Probestack),
+                    0x00,
-                // 6 is the size of the jmp instruction. The relocated address must follow
+                ]),
-                offset: 6,
+                relocations: vec![Relocation {
-                addend: 0,
+                    kind: RelocationKind::Abs8,
-            }],
+                    reloc_target: RelocationTarget::LibCall(LibCall::Probestack),
-        };
+                    // 6 is the size of the jmp instruction. The relocated address must follow
-        #[cfg(all(target_arch = "x86_64", target_os = "linux"))]
+                    offset: 6,
-        custom_sections.push(probestack_trampoline);
+                    addend: 0,
-        #[cfg(all(target_arch = "x86_64", target_os = "linux"))]
+                }],
-        let probestack_trampoline_relocation_target = SectionIndex::new(custom_sections.len() - 1);
+            };
+            custom_sections.push(probestack_trampoline);
 
-        let functions = function_body_inputs
+            Some(SectionIndex::new(custom_sections.len() - 1))
+        } else {
+            None
+        };
+
+        let (functions, fdes): (Vec<CompiledFunction>, Vec<_>) = function_body_inputs
             .iter()
             .collect::<Vec<(LocalFunctionIndex, &FunctionBodyData<'_>)>>()
             .par_iter()
@@ -170,12 +174,8 @@ impl Compiler for CraneliftCompiler {
                 )?;
 
                 let mut code_buf: Vec<u8> = Vec::new();
-                let mut reloc_sink = RelocSink::new(
+                let mut reloc_sink =
-                    &module,
+                    RelocSink::new(&module, func_index, probestack_trampoline_relocation_target);
-                    func_index,
-                    #[cfg(all(target_arch = "x86_64", target_os = "linux"))]
-                    probestack_trampoline_relocation_target,
-                );
                 let mut trap_sink = TrapSink::new();
                 let mut stackmap_sink = binemit::NullStackMapSink {};
                 context
@@ -190,31 +190,31 @@ impl Compiler for CraneliftCompiler {
                         CompileError::Codegen(pretty_error(&context.func, Some(&*isa), error))
                     })?;
 
-                let unwind_info = match compiled_function_unwind_info(&*isa, &context)? {
+                let (unwind_info, fde) = match compiled_function_unwind_info(&*isa, &context)? {
                     #[cfg(feature = "unwind")]
                     CraneliftUnwindInfo::FDE(fde) => {
-                        if let Some((dwarf_frametable, cie_id)) = &dwarf_frametable {
+                        if dwarf_frametable.is_some() {
-                            dwarf_frametable
+                            let fde = fde.to_fde(Address::Symbol {
-                                .lock()
+                                // The symbol is the kind of relocation.
-                                .expect("Can't write into DWARF frametable")
+                                // "0" is used for functions
-                                .add_fde(
+                                symbol: WriterRelocate::FUNCTION_SYMBOL,
-                                    *cie_id,
+                                // We use the addend as a way to specify the
-                                    fde.to_fde(Address::Symbol {
+                                // function index
-                                        // The symbol is the kind of relocation.
+                                addend: i.index() as _,
-                                        // "0" is used for functions
+                            });
-                                        symbol: WriterRelocate::FUNCTION_SYMBOL,
-                                        // We use the addend as a way to specify the
-                                        // function index
-                                        addend: i.index() as _,
-                                    }),
-                                );
                             // The unwind information is inserted into the dwarf section
-                            Some(CompiledFunctionUnwindInfo::Dwarf)
+                            (Some(CompiledFunctionUnwindInfo::Dwarf), Some(fde))
                         } else {
-                            None
+                            (None, None)
                         }
                     }
-                    other => other.maybe_into_to_windows_unwind(),
+                    #[cfg(feature = "unwind")]
+                    other => (other.maybe_into_to_windows_unwind(), None),
+
+                    // This is a bit hacky, but necessary since gimli is not
+                    // available when the "unwind" feature is disabled.
+                    #[cfg(not(feature = "unwind"))]
+                    other => (other.maybe_into_to_windows_unwind(), None::<()>),
                 };
 
                 let range = reader.range();
@@ -223,40 +223,41 @@ impl Compiler for CraneliftCompiler {
                 // We transform the Cranelift JumpTable's into compiler JumpTables
                 let func_jt_offsets = transform_jump_table(context.func.jt_offsets);
 
-                Ok(CompiledFunction {
+                Ok((
-                    body: FunctionBody {
+                    CompiledFunction {
-                        body: code_buf,
+                        body: FunctionBody {
-                        unwind_info,
+                            body: code_buf,
+                            unwind_info,
+                        },
+                        jt_offsets: func_jt_offsets,
+                        relocations: reloc_sink.func_relocs,
+                        frame_info: CompiledFunctionFrameInfo {
+                            address_map,
+                            traps: trap_sink.traps,
+                        },
                     },
-                    jt_offsets: func_jt_offsets,
+                    fde,
-                    relocations: reloc_sink.func_relocs,
+                ))
-                    frame_info: CompiledFunctionFrameInfo {
-                        address_map,
-                        traps: trap_sink.traps,
-                    },
-                })
             })
             .collect::<Result<Vec<_>, CompileError>>()?
             .into_iter()
-            .collect::<PrimaryMap<LocalFunctionIndex, _>>();
+            .unzip();
 
         #[cfg(feature = "unwind")]
-        let dwarf = {
+        let dwarf = if let Some((mut dwarf_frametable, cie_id)) = dwarf_frametable {
-            let dwarf = if let Some((dwarf_frametable, _cie_id)) = dwarf_frametable {
+            for fde in fdes {
-                let mut eh_frame = EhFrame(WriterRelocate::new(target.triple().endianness().ok()));
+                if let Some(fde) = fde {
-                dwarf_frametable
+                    dwarf_frametable.add_fde(cie_id, fde);
-                    .lock()
+                }
-                    .unwrap()
+            }
-                    .write_eh_frame(&mut eh_frame)
+            let mut eh_frame = EhFrame(WriterRelocate::new(target.triple().endianness().ok()));
-                    .unwrap();
+            dwarf_frametable.write_eh_frame(&mut eh_frame).unwrap();
 
-                let eh_frame_section = eh_frame.0.into_section();
+            let eh_frame_section = eh_frame.0.into_section();
-                custom_sections.push(eh_frame_section);
+            custom_sections.push(eh_frame_section);
-                Some(Dwarf::new(SectionIndex::new(custom_sections.len() - 1)))
+            Some(Dwarf::new(SectionIndex::new(custom_sections.len() - 1)))
-            } else {
+        } else {
-                None
+            None
-            };
-            dwarf
         };
         #[cfg(not(feature = "unwind"))]
         let dwarf = None;
@@ -289,7 +290,7 @@ impl Compiler for CraneliftCompiler {
             .collect::<PrimaryMap<FunctionIndex, FunctionBody>>();
 
         Ok(Compilation::new(
-            functions,
+            functions.into_iter().collect(),
             custom_sections,
             function_call_trampolines,
             dynamic_function_trampolines,

lib/compiler-cranelift/src/sink.rs

@@ -2,12 +2,10 @@
 
 use crate::translator::{irlibcall_to_libcall, irreloc_to_relocationkind};
 use cranelift_codegen::binemit;
-#[cfg(target_arch = "x86_64")]
 use cranelift_codegen::ir::LibCall;
 use cranelift_codegen::ir::{self, ExternalName};
 use cranelift_entity::EntityRef as CraneliftEntityRef;
 use wasmer_compiler::{JumpTable, Relocation, RelocationTarget, TrapInformation};
-#[cfg(all(target_arch = "x86_64", target_os = "linux"))]
 use wasmer_compiler::{RelocationKind, SectionIndex};
 use wasmer_types::entity::EntityRef;
 use wasmer_types::{FunctionIndex, LocalFunctionIndex, ModuleInfo};
@@ -24,8 +22,7 @@ pub(crate) struct RelocSink<'a> {
     pub func_relocs: Vec<Relocation>,
 
     /// The section where the probestack trampoline call is located
-    #[cfg(all(target_arch = "x86_64", target_os = "linux"))]
+    pub probestack_trampoline_relocation_target: Option<SectionIndex>,
-    pub probestack_trampoline_relocation_target: SectionIndex,
 }
 
 impl<'a> binemit::RelocSink for RelocSink<'a> {
@@ -45,13 +42,12 @@ impl<'a> binemit::RelocSink for RelocSink<'a> {
                     .expect("The provided function should be local"),
             )
         } else if let ExternalName::LibCall(libcall) = *name {
-            match libcall {
+            match (libcall, self.probestack_trampoline_relocation_target) {
-                #[cfg(all(target_arch = "x86_64", target_os = "linux"))]
+                (LibCall::Probestack, Some(probestack_trampoline_relocation_target)) => {
-                LibCall::Probestack => {
                     self.func_relocs.push(Relocation {
                         kind: RelocationKind::X86CallPCRel4,
                         reloc_target: RelocationTarget::CustomSection(
-                            self.probestack_trampoline_relocation_target,
+                            probestack_trampoline_relocation_target,
                         ),
                         offset: offset,
                         addend: addend,
@@ -100,8 +96,7 @@ impl<'a> RelocSink<'a> {
     pub fn new(
         module: &'a ModuleInfo,
         func_index: FunctionIndex,
-        #[cfg(all(target_arch = "x86_64", target_os = "linux"))]
+        probestack_trampoline_relocation_target: Option<SectionIndex>,
-        probestack_trampoline_relocation_target: SectionIndex,
     ) -> Self {
         let local_func_index = module
             .local_func_index(func_index)
@@ -110,7 +105,6 @@ impl<'a> RelocSink<'a> {
             module,
             local_func_index,
             func_relocs: Vec::new(),
-            #[cfg(all(target_arch = "x86_64", target_os = "linux"))]
             probestack_trampoline_relocation_target,
         }
     }

lib/compiler-llvm/Cargo.toml

@@ -28,7 +28,7 @@ loupe = "0.1"
 package = "inkwell"
 version = "0.1.0-beta.4"
 default-features = false
-features = ["llvm11-0", "target-x86", "target-aarch64"]
+features = ["llvm12-0", "target-x86", "target-aarch64"]
 
 [build-dependencies]
 cc = "1.0"

lib/compiler-llvm/README.md

@@ -24,14 +24,14 @@ to native speeds.
 ## Requirements
 
 The LLVM compiler requires a valid installation of LLVM in your system.
-It currently requires **LLVM 11**.
+It currently requires **LLVM 12**.
 
 
 You can install LLVM easily on your Debian-like system via this command:
 
 ```bash
 wget https://apt.llvm.org/llvm.sh -O /tmp/llvm.sh
-sudo bash /tmp/llvm.sh 11
+sudo bash /tmp/llvm.sh 12
 ```
 
 Or in macOS:

lib/compiler-llvm/src/abi/aarch64_systemv.rs

@@ -4,7 +4,7 @@ use inkwell::{
     attributes::{Attribute, AttributeLoc},
     builder::Builder,
     context::Context,
-    types::{BasicMetadataTypeEnum, BasicType, FunctionType, StructType},
+    types::{AnyType, BasicMetadataTypeEnum, BasicType, FunctionType, StructType},
     values::{BasicValue, BasicValueEnum, CallSiteValue, FunctionValue, IntValue, PointerValue},
     AddressSpace,
 };
@@ -206,17 +206,16 @@ impl Abi for Aarch64SystemV {
                             .map(|&ty| type_to_llvm(intrinsics, ty))
                             .collect::<Result<_, _>>()?;
 
-                        let sret = context
+                        let sret = context.struct_type(&basic_types, false);
-                            .struct_type(&basic_types, false)
+                        let sret_ptr = sret.ptr_type(AddressSpace::Generic);
-                            .ptr_type(AddressSpace::Generic);
 
                         let param_types =
-                            std::iter::once(Ok(sret.as_basic_type_enum())).chain(param_types);
+                            std::iter::once(Ok(sret_ptr.as_basic_type_enum())).chain(param_types);
 
                         let mut attributes = vec![(
-                            context.create_enum_attribute(
+                            context.create_type_attribute(
                                 Attribute::get_named_enum_kind_id("sret"),
-                                0,
+                                sret.as_any_type_enum(),
                             ),
                             AttributeLoc::Param(0),
                         )];

lib/compiler-llvm/src/abi/x86_64_systemv.rs

@@ -4,7 +4,7 @@ use inkwell::{
     attributes::{Attribute, AttributeLoc},
     builder::Builder,
     context::Context,
-    types::{BasicMetadataTypeEnum, BasicType, FunctionType, StructType},
+    types::{AnyType, BasicMetadataTypeEnum, BasicType, FunctionType, StructType},
     values::{
         BasicValue, BasicValueEnum, CallSiteValue, FloatValue, FunctionValue, IntValue,
         PointerValue, VectorValue,
@@ -263,14 +263,17 @@ impl Abi for X86_64SystemV {
                     .map(|&ty| type_to_llvm(intrinsics, ty))
                     .collect::<Result<_, _>>()?;
 
-                let sret = context
+                let sret = context.struct_type(&basic_types, false);
-                    .struct_type(&basic_types, false)
+                let sret_ptr = sret.ptr_type(AddressSpace::Generic);
-                    .ptr_type(AddressSpace::Generic);
 
-                let param_types = std::iter::once(Ok(sret.as_basic_type_enum())).chain(param_types);
+                let param_types =
+                    std::iter::once(Ok(sret_ptr.as_basic_type_enum())).chain(param_types);
 
                 let mut attributes = vec![(
-                    context.create_enum_attribute(Attribute::get_named_enum_kind_id("sret"), 0),
+                    context.create_type_attribute(
+                        Attribute::get_named_enum_kind_id("sret"),
+                        sret.as_any_type_enum(),
+                    ),
                     AttributeLoc::Param(0),
                 )];
                 attributes.append(&mut vmctx_attributes(1));

lib/compiler-singlepass/src/codegen_x64.rs

@@ -1,6 +1,6 @@
 use crate::address_map::get_function_address_map;
 use crate::{common_decl::*, config::Singlepass, emitter_x64::*, machine::Machine, x64_decl::*};
-use dynasmrt::{x64::Assembler, DynamicLabel};
+use dynasmrt::{x64::X64Relocation, DynamicLabel, VecAssembler};
 use smallvec::{smallvec, SmallVec};
 use std::collections::BTreeMap;
 use std::iter;
@@ -22,6 +22,8 @@ use wasmer_types::{
 };
 use wasmer_vm::{MemoryStyle, TableStyle, TrapCode, VMBuiltinFunctionIndex, VMOffsets};
 
+type Assembler = VecAssembler<X64Relocation>;
+
 /// The singlepass per-function code generator.
 pub struct FuncGen<'a> {
     // Immutable properties assigned at creation time.
@@ -89,6 +91,9 @@ pub struct FuncGen<'a> {
     ///
     // Ordered by increasing InstructionAddressMap::srcloc.
     instructions_address_map: Vec<InstructionAddressMap>,
+
+    /// Calling convention to use.
+    calling_convention: CallingConvention,
 }
 
 struct SpecialLabelSet {
@@ -1010,7 +1015,7 @@ impl<'a> FuncGen<'a> {
                 self.machine.state.stack_values.push(content);
             }
         }
-        let calling_convention = self.config.calling_convention;
+        let calling_convention = self.calling_convention;
 
         let stack_padding: usize = match calling_convention {
             CallingConvention::WindowsFastcall => 32,
@@ -1756,7 +1761,7 @@ impl<'a> FuncGen<'a> {
             &mut self.assembler,
             self.local_types.len(),
             self.signature.params().len(),
-            self.config.calling_convention,
+            self.calling_convention,
         );
 
         // Mark vmctx register. The actual loading of the vmctx value is handled by init_local.
@@ -1823,6 +1828,7 @@ impl<'a> FuncGen<'a> {
         _table_styles: &'a PrimaryMap<TableIndex, TableStyle>,
         local_func_index: LocalFunctionIndex,
         local_types_excluding_arguments: &[WpType],
+        calling_convention: CallingConvention,
     ) -> Result<FuncGen<'a>, CodegenError> {
         let func_index = module.func_index(local_func_index);
         let sig_index = module.functions[func_index];
@@ -1844,7 +1850,7 @@ impl<'a> FuncGen<'a> {
                 .collect(),
         );
 
-        let mut assembler = Assembler::new().unwrap();
+        let mut assembler = Assembler::new(0);
         let special_labels = SpecialLabelSet {
             integer_division_by_zero: assembler.get_label(),
             heap_access_oob: assembler.get_label(),
@@ -1874,6 +1880,7 @@ impl<'a> FuncGen<'a> {
             special_labels,
             src_loc: 0,
             instructions_address_map: vec![],
+            calling_convention,
         };
         fg.emit_head()?;
         Ok(fg)
@@ -5404,7 +5411,7 @@ impl<'a> FuncGen<'a> {
                     self.vmoffsets.vmcaller_checked_anyfunc_func_ptr() as usize;
                 let vmcaller_checked_anyfunc_vmctx =
                     self.vmoffsets.vmcaller_checked_anyfunc_vmctx() as usize;
-                let calling_convention = self.config.calling_convention;
+                let calling_convention = self.calling_convention;
 
                 self.emit_call_native(
                     |this| {
@@ -6698,7 +6705,7 @@ impl<'a> FuncGen<'a> {
                     self.machine.finalize_locals(
                         &mut self.assembler,
                         &self.locals,
-                        self.config.calling_convention,
+                        self.calling_convention,
                     );
                     self.assembler.emit_mov(
                         Size::S64,
@@ -8811,7 +8818,7 @@ pub fn gen_std_trampoline(
     sig: &FunctionType,
     calling_convention: CallingConvention,
 ) -> FunctionBody {
-    let mut a = Assembler::new().unwrap();
+    let mut a = Assembler::new(0);
 
     // Calculate stack offset.
     let mut stack_offset: u32 = 0;
@@ -8921,7 +8928,7 @@ pub fn gen_std_dynamic_import_trampoline(
     sig: &FunctionType,
     calling_convention: CallingConvention,
 ) -> FunctionBody {
-    let mut a = Assembler::new().unwrap();
+    let mut a = Assembler::new(0);
 
     // Allocate argument array.
     let stack_offset: usize = 16 * std::cmp::max(sig.params().len(), sig.results().len()) + 8; // 16 bytes each + 8 bytes sysv call padding
@@ -9043,7 +9050,7 @@ pub fn gen_import_call_trampoline(
     sig: &FunctionType,
     calling_convention: CallingConvention,
 ) -> CustomSection {
-    let mut a = Assembler::new().unwrap();
+    let mut a = Assembler::new(0);
 
     // TODO: ARM entry trampoline is not emitted.
 

lib/compiler-singlepass/src/compiler.rs

@@ -13,7 +13,7 @@ use rayon::prelude::{IntoParallelIterator, ParallelIterator};
 use std::sync::Arc;
 use wasmer_compiler::{
     Architecture, CallingConvention, Compilation, CompileError, CompileModuleInfo,
-    CompiledFunction, Compiler, CompilerConfig, FunctionBinaryReader, FunctionBody,
+    CompiledFunction, Compiler, CompilerConfig, CpuFeature, FunctionBinaryReader, FunctionBody,
     FunctionBodyData, MiddlewareBinaryReader, ModuleMiddleware, ModuleMiddlewareChain,
     ModuleTranslationState, OperatingSystem, SectionIndex, Target, TrapInformation,
 };
@@ -62,8 +62,15 @@ impl Compiler for SinglepassCompiler {
                 OperatingSystem::Windows.to_string(),
             ));
         }*/
-        if let Architecture::X86_32(arch) = target.triple().architecture {
+        if target.triple().architecture != Architecture::X86_64 {
-            return Err(CompileError::UnsupportedTarget(arch.to_string()));
+            return Err(CompileError::UnsupportedTarget(
+                target.triple().architecture.to_string(),
+            ));
+        }
+        if !target.cpu_features().contains(CpuFeature::AVX) {
+            return Err(CompileError::UnsupportedTarget(
+                "x86_64 without AVX".to_string(),
+            ));
         }
         if compile_info.features.multi_value {
             return Err(CompileError::UnsupportedFeature("multivalue".to_string()));
@@ -125,6 +132,7 @@ impl Compiler for SinglepassCompiler {
                     &table_styles,
                     i,
                     &locals,
+                    calling_convention,
                 )
                 .map_err(to_compile_error)?;
 

lib/compiler-singlepass/src/config.rs

@@ -4,9 +4,7 @@
 use crate::compiler::SinglepassCompiler;
 use loupe::MemoryUsage;
 use std::sync::Arc;
-use wasmer_compiler::{
+use wasmer_compiler::{Compiler, CompilerConfig, CpuFeature, ModuleMiddleware, Target};
-    CallingConvention, Compiler, CompilerConfig, CpuFeature, ModuleMiddleware, Target,
-};
 use wasmer_types::Features;
 
 #[derive(Debug, Clone, MemoryUsage)]
@@ -15,8 +13,6 @@ pub struct Singlepass {
     pub(crate) enable_stack_check: bool,
     /// The middleware chain.
     pub(crate) middlewares: Vec<Arc<dyn ModuleMiddleware>>,
-    #[loupe(skip)]
-    pub(crate) calling_convention: CallingConvention,
 }
 
 impl Singlepass {
@@ -27,12 +23,6 @@ impl Singlepass {
             enable_nan_canonicalization: true,
             enable_stack_check: false,
             middlewares: vec![],
-            calling_convention: match Target::default().triple().default_calling_convention() {
-                Ok(CallingConvention::WindowsFastcall) => CallingConvention::WindowsFastcall,
-                Ok(CallingConvention::SystemV) => CallingConvention::SystemV,
-                //Ok(CallingConvention::AppleAarch64) => AppleAarch64,
-                _ => panic!("Unsupported Calling convention for Singlepass"),
-            },
         }
     }
 

lib/compiler-singlepass/src/emitter_x64.rs

@@ -1,6 +1,10 @@
 pub use crate::x64_decl::{GPR, XMM};
 use dynasm::dynasm;
-use dynasmrt::{x64::Assembler, AssemblyOffset, DynamicLabel, DynasmApi, DynasmLabelApi};
+use dynasmrt::{
+    x64::X64Relocation, AssemblyOffset, DynamicLabel, DynasmApi, DynasmLabelApi, VecAssembler,
+};
+
+type Assembler = VecAssembler<X64Relocation>;
 
 /// Force `dynasm!` to use the correct arch (x64) when cross-compiling.
 /// `dynasm!` proc-macro tries to auto-detect it by default by looking at the
@@ -479,7 +483,7 @@ macro_rules! binop_shift {
 
 macro_rules! jmp_op {
     ($ins:ident, $assembler:tt, $label:ident) => {
-        dynasm!($assembler ; $ins =>$label);
+        dynasm!($assembler ; $ins =>$label)
     }
 }
 

lib/compiler-singlepass/src/machine.rs

@@ -586,12 +586,14 @@ impl Machine {
 #[cfg(test)]
 mod test {
     use super::*;
-    use dynasmrt::x64::Assembler;
+    use dynasmrt::x64::X64Relocation;
+    use dynasmrt::VecAssembler;
+    type Assembler = VecAssembler<X64Relocation>;
 
     #[test]
     fn test_release_locations_keep_state_nopanic() {
         let mut machine = Machine::new();
-        let mut assembler = Assembler::new().unwrap();
+        let mut assembler = Assembler::new(0);
         let locs = machine.acquire_locations(
             &mut assembler,
             &(0..10)

lib/compiler/Cargo.toml

@@ -21,7 +21,7 @@ serde = { version = "1.0", features = ["derive"], optional = true }
 thiserror = "1.0"
 serde_bytes = { version = "0.11", optional = true }
 smallvec = "1.6"
-rkyv = { version = "0.6.1", optional = true }
+rkyv = { version = "0.7.20", optional = true }
 loupe = "0.1"
 
 [features]

lib/compiler/src/section.rs

@@ -22,7 +22,7 @@ use wasmer_types::entity::entity_impl;
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 #[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug, MemoryUsage)]
 pub struct SectionIndex(u32);

lib/engine-dylib/Cargo.toml

@@ -23,8 +23,9 @@ leb128 = "0.2"
 libloading = "0.7"
 tempfile = "3.1"
 which = "4.0"
-rkyv = "0.6.1"
+rkyv = "0.7.20"
 loupe = "0.1"
+enumset = "1.0"
 
 [features]
 # Enable the `compiler` feature if you want the engine to compile

lib/engine-dylib/src/artifact.rs

@@ -3,6 +3,7 @@
 
 use crate::engine::{DylibEngine, DylibEngineInner};
 use crate::serialize::{ArchivedModuleMetadata, ModuleMetadata};
+use enumset::EnumSet;
 use libloading::{Library, Symbol as LibrarySymbol};
 use loupe::MemoryUsage;
 use std::error::Error;
@@ -17,8 +18,8 @@ use tracing::log::error;
 #[cfg(feature = "compiler")]
 use tracing::trace;
 use wasmer_compiler::{
-    Architecture, CompileError, CompiledFunctionFrameInfo, Features, FunctionAddressMap,
+    Architecture, CompileError, CompiledFunctionFrameInfo, CpuFeature, Features,
-    OperatingSystem, Symbol, SymbolRegistry, Triple,
+    FunctionAddressMap, OperatingSystem, Symbol, SymbolRegistry, Triple,
 };
 #[cfg(feature = "compiler")]
 use wasmer_compiler::{
@@ -211,6 +212,7 @@ impl DylibArtifact {
             prefix: engine_inner.get_prefix(&data),
             data_initializers,
             function_body_lengths,
+            cpu_features: target.cpu_features().as_u64(),
         };
 
         let serialized_data = metadata.serialize()?;
@@ -800,6 +802,10 @@ impl Artifact for DylibArtifact {
         &self.metadata.compile_info.features
     }
 
+    fn cpu_features(&self) -> enumset::EnumSet<CpuFeature> {
+        EnumSet::from_u64(self.metadata.cpu_features)
+    }
+
     fn data_initializers(&self) -> &[OwnedDataInitializer] {
         &*self.metadata.data_initializers
     }

lib/engine-dylib/src/serialize.rs

@@ -1,10 +1,8 @@
 use loupe::MemoryUsage;
 use rkyv::{
-    archived_value,
+    archived_value, de::deserializers::SharedDeserializeMap, ser::serializers::AllocSerializer,
-    de::{adapters::SharedDeserializerAdapter, deserializers::AllocDeserializer},
+    ser::Serializer as RkyvSerializer, Archive, Deserialize as RkyvDeserialize,
-    ser::adapters::SharedSerializerAdapter,
+    Serialize as RkyvSerialize,
-    ser::{serializers::WriteSerializer, Serializer as RkyvSerializer},
-    Archive, Deserialize as RkyvDeserialize, Serialize as RkyvSerialize,
 };
 use serde::{Deserialize, Serialize};
 use std::error::Error;
@@ -35,6 +33,7 @@ pub struct ModuleMetadata {
     pub data_initializers: Box<[OwnedDataInitializer]>,
     // The function body lengths (used to find function by address)
     pub function_body_lengths: PrimaryMap<LocalFunctionIndex, u64>,
+    pub cpu_features: u64,
 }
 
 pub struct ModuleMetadataSymbolRegistry<'a> {
@@ -59,11 +58,11 @@ impl ModuleMetadata {
     }
 
     pub fn serialize(&mut self) -> Result<Vec<u8>, CompileError> {
-        let mut serializer = SharedSerializerAdapter::new(WriteSerializer::new(vec![]));
+        let mut serializer = AllocSerializer::<4096>::default();
         let pos = serializer.serialize_value(self).map_err(to_compile_error)? as u64;
-        let mut serialized_data = serializer.into_inner().into_inner();
+        let mut serialized_data = serializer.into_serializer().into_inner();
         serialized_data.extend_from_slice(&pos.to_le_bytes());
-        Ok(serialized_data)
+        Ok(serialized_data.to_vec())
     }
 
     pub unsafe fn deserialize(metadata_slice: &[u8]) -> Result<Self, DeserializeError> {
@@ -86,7 +85,7 @@ impl ModuleMetadata {
     pub fn deserialize_from_archive(
         archived: &ArchivedModuleMetadata,
     ) -> Result<Self, DeserializeError> {
-        let mut deserializer = SharedDeserializerAdapter::new(AllocDeserializer);
+        let mut deserializer = SharedDeserializeMap::new();
         RkyvDeserialize::deserialize(archived, &mut deserializer)
             .map_err(|e| DeserializeError::CorruptedBinary(format!("{:?}", e)))
     }

lib/engine-staticlib/Cargo.toml

@@ -24,6 +24,7 @@ leb128 = "0.2"
 libloading = "0.7"
 tempfile = "3.1"
 loupe = "0.1"
+enumset = "1.0"
 
 [features]
 # Enable the `compiler` feature if you want the engine to compile

lib/engine-staticlib/src/artifact.rs

@@ -3,12 +3,15 @@
 
 use crate::engine::{StaticlibEngine, StaticlibEngineInner};
 use crate::serialize::{ModuleMetadata, ModuleMetadataSymbolRegistry};
+use enumset::EnumSet;
 use loupe::MemoryUsage;
 use std::collections::BTreeMap;
 use std::error::Error;
 use std::mem;
 use std::sync::Arc;
-use wasmer_compiler::{CompileError, Features, OperatingSystem, SymbolRegistry, Triple};
+use wasmer_compiler::{
+    CompileError, CpuFeature, Features, OperatingSystem, SymbolRegistry, Triple,
+};
 #[cfg(feature = "compiler")]
 use wasmer_compiler::{
     CompileModuleInfo, Compiler, FunctionBodyData, ModuleEnvironment, ModuleMiddlewareChain,
@@ -46,6 +49,7 @@ pub struct StaticlibArtifact {
     /// Length of the serialized metadata
     metadata_length: usize,
     symbol_registry: ModuleMetadataSymbolRegistry,
+    is_compiled: bool,
 }
 
 #[allow(dead_code)]
@@ -181,6 +185,7 @@ impl StaticlibArtifact {
             prefix: engine_inner.get_prefix(&data),
             data_initializers,
             function_body_lengths,
+            cpu_features: target.cpu_features().as_u64(),
         };
 
         /*
@@ -295,6 +300,7 @@ impl StaticlibArtifact {
             func_data_registry: engine_inner.func_data().clone(),
             metadata_length,
             symbol_registry,
+            is_compiled: true,
         })
     }
 
@@ -415,6 +421,7 @@ impl StaticlibArtifact {
             func_data_registry,
             metadata_length: 0,
             symbol_registry,
+            is_compiled: false,
         })
     }
 
@@ -450,6 +457,10 @@ impl Artifact for StaticlibArtifact {
         &self.metadata.compile_info.features
     }
 
+    fn cpu_features(&self) -> EnumSet<CpuFeature> {
+        EnumSet::from_u64(self.metadata.cpu_features)
+    }
+
     fn data_initializers(&self) -> &[OwnedDataInitializer] {
         &*self.metadata.data_initializers
     }
@@ -483,6 +494,12 @@ impl Artifact for StaticlibArtifact {
     }
 
     fn preinstantiate(&self) -> Result<(), InstantiationError> {
+        if self.is_compiled {
+            panic!(
+                "a module built with the staticlib engine must be linked \
+                into the current executable"
+            );
+        }
         Ok(())
     }
 

lib/engine-staticlib/src/serialize.rs

@@ -12,6 +12,7 @@ pub struct ModuleMetadata {
     pub data_initializers: Box<[OwnedDataInitializer]>,
     // The function body lengths (used to find function by address)
     pub function_body_lengths: PrimaryMap<LocalFunctionIndex, u64>,
+    pub cpu_features: u64,
 }
 
 #[derive(MemoryUsage)]

lib/engine-universal/Cargo.toml

@@ -11,16 +11,22 @@ readme = "README.md"
 edition = "2018"
 
 [dependencies]
-wasmer-types = { path = "../types", version = "2.0.0", features = ["enable-rkyv"] }
+wasmer-types = { path = "../types", version = "2.0.0", features = [
-wasmer-compiler = { path = "../compiler", version = "2.0.0", features = ["translator", "enable-rkyv"] }
+    "enable-rkyv",
+] }
+wasmer-compiler = { path = "../compiler", version = "2.0.0", features = [
+    "translator",
+    "enable-rkyv",
+] }
 wasmer-vm = { path = "../vm", version = "2.0.0", features = ["enable-rkyv"] }
 wasmer-engine = { path = "../engine", version = "2.0.0" }
 # flexbuffers = { path = "../../../flatbuffers/rust/flexbuffers", version = "0.1.0" }
 region = "3.0"
 cfg-if = "1.0"
 leb128 = "0.2"
-rkyv = "0.6.1"
+rkyv = "0.7.20"
 loupe = "0.1"
+enumset = "1.0"
 
 [target.'cfg(target_os = "windows")'.dependencies]
 winapi = { version = "0.3", features = ["winnt", "impl-default"] }

lib/engine-universal/src/artifact.rs

@@ -6,9 +6,10 @@ use crate::link::link_module;
 #[cfg(feature = "compiler")]
 use crate::serialize::SerializableCompilation;
 use crate::serialize::SerializableModule;
+use enumset::EnumSet;
 use loupe::MemoryUsage;
 use std::sync::{Arc, Mutex};
-use wasmer_compiler::{CompileError, Features, Triple};
+use wasmer_compiler::{CompileError, CpuFeature, Features, Triple};
 #[cfg(feature = "compiler")]
 use wasmer_compiler::{CompileModuleInfo, ModuleEnvironment, ModuleMiddlewareChain};
 use wasmer_engine::{
@@ -128,6 +129,7 @@ impl UniversalArtifact {
             compilation: serializable_compilation,
             compile_info,
             data_initializers,
+            cpu_features: engine.target().cpu_features().as_u64(),
         };
         Self::from_parts(&mut inner_engine, serializable)
     }
@@ -307,6 +309,10 @@ impl Artifact for UniversalArtifact {
         &self.serializable.compile_info.features
     }
 
+    fn cpu_features(&self) -> EnumSet<CpuFeature> {
+        EnumSet::from_u64(self.serializable.cpu_features)
+    }
+
     fn data_initializers(&self) -> &[OwnedDataInitializer] {
         &*self.serializable.data_initializers
     }

lib/engine-universal/src/serialize.rs

@@ -1,10 +1,8 @@
 use loupe::MemoryUsage;
 use rkyv::{
-    archived_value,
+    archived_value, de::deserializers::SharedDeserializeMap, ser::serializers::AllocSerializer,
-    de::{adapters::SharedDeserializerAdapter, deserializers::AllocDeserializer},
+    ser::Serializer as RkyvSerializer, Archive, Deserialize as RkyvDeserialize,
-    ser::adapters::SharedSerializerAdapter,
+    Serialize as RkyvSerialize,
-    ser::{serializers::WriteSerializer, Serializer as RkyvSerializer},
-    Archive, Deserialize as RkyvDeserialize, Serialize as RkyvSerialize,
 };
 use wasmer_compiler::{
     CompileModuleInfo, CompiledFunctionFrameInfo, CustomSection, Dwarf, FunctionBody,
@@ -38,6 +36,7 @@ pub struct SerializableModule {
     pub compilation: SerializableCompilation,
     pub compile_info: CompileModuleInfo,
     pub data_initializers: Box<[OwnedDataInitializer]>,
+    pub cpu_features: u64,
 }
 
 fn to_serialize_error(err: impl std::error::Error) -> SerializeError {
@@ -49,13 +48,13 @@ impl SerializableModule {
     /// The bytes will have the following format:
     /// RKYV serialization (any length) + POS (8 bytes)
     pub fn serialize(&self) -> Result<Vec<u8>, SerializeError> {
-        let mut serializer = SharedSerializerAdapter::new(WriteSerializer::new(vec![]));
+        let mut serializer = AllocSerializer::<4096>::default();
         let pos = serializer
             .serialize_value(self)
             .map_err(to_serialize_error)? as u64;
-        let mut serialized_data = serializer.into_inner().into_inner();
+        let mut serialized_data = serializer.into_serializer().into_inner();
         serialized_data.extend_from_slice(&pos.to_le_bytes());
-        Ok(serialized_data)
+        Ok(serialized_data.to_vec())
     }
 
     /// Deserialize a Module from a slice.
@@ -98,7 +97,7 @@ impl SerializableModule {
     pub fn deserialize_from_archive(
         archived: &ArchivedSerializableModule,
     ) -> Result<Self, DeserializeError> {
-        let mut deserializer = SharedDeserializerAdapter::new(AllocDeserializer);
+        let mut deserializer = SharedDeserializeMap::new();
         RkyvDeserialize::deserialize(archived, &mut deserializer)
             .map_err(|e| DeserializeError::CorruptedBinary(format!("{:?}", e)))
     }

lib/engine/Cargo.toml

@@ -25,6 +25,7 @@ serde = { version = "1.0", features = ["derive", "rc"] }
 serde_bytes = { version = "0.11" }
 lazy_static = "1.4"
 loupe = "0.1"
+enumset = "1.0"
 
 [badges]
 maintenance = { status = "actively-developed" }

lib/engine/src/artifact.rs

@@ -1,12 +1,13 @@
 use crate::{
     resolve_imports, InstantiationError, Resolver, RuntimeError, SerializeError, Tunables,
 };
+use enumset::EnumSet;
 use loupe::MemoryUsage;
 use std::any::Any;
 use std::fs;
 use std::path::Path;
 use std::sync::Arc;
-use wasmer_compiler::Features;
+use wasmer_compiler::{CpuFeature, Features};
 use wasmer_types::entity::{BoxedSlice, PrimaryMap};
 use wasmer_types::{
     DataInitializer, FunctionIndex, LocalFunctionIndex, MemoryIndex, ModuleInfo,
@@ -43,6 +44,9 @@ pub trait Artifact: Send + Sync + Upcastable + MemoryUsage {
     /// Returns the features for this Artifact
     fn features(&self) -> &Features;
 
+    /// Returns the CPU features for this Artifact
+    fn cpu_features(&self) -> EnumSet<CpuFeature>;
+
     /// Returns the memory styles associated with this `Artifact`.
     fn memory_styles(&self) -> &PrimaryMap<MemoryIndex, MemoryStyle>;
 
@@ -96,6 +100,16 @@ pub trait Artifact: Send + Sync + Upcastable + MemoryUsage {
         resolver: &dyn Resolver,
         host_state: Box<dyn Any>,
     ) -> Result<InstanceHandle, InstantiationError> {
+        // Validate the CPU features this module was compiled with against the
+        // host CPU features.
+        let host_cpu_features = CpuFeature::for_host();
+        if !host_cpu_features.is_superset(self.cpu_features()) {
+            Err(InstantiationError::CpuFeature(format!(
+                "{:?}",
+                self.cpu_features().difference(host_cpu_features)
+            )))?;
+        }
+
         self.preinstantiate()?;
 
         let module = self.module();

lib/engine/src/error.rs

@@ -91,6 +91,11 @@ pub enum InstantiationError {
     #[error(transparent)]
     Link(LinkError),
 
+    /// The module was compiled with a CPU feature that is not available on
+    /// the current host.
+    #[error("module compiled with CPU feature that is missing from host")]
+    CpuFeature(String),
+
     /// A runtime error occured while invoking the start function
     #[error(transparent)]
     Start(RuntimeError),

lib/types/Cargo.toml

@@ -14,7 +14,7 @@ edition = "2018"
 serde = { version = "1.0", features = ["derive", "rc"], optional = true, default-features = false }
 thiserror = "1.0"
 indexmap = { version = "1.6", features = ["serde-1"] }
-rkyv = { version = "0.6.1", optional = true }
+rkyv = { version = "0.7.20", optional = true }
 loupe = { version = "0.1", features = ["enable-indexmap"] }
 
 [features]

lib/types/src/archives.rs

@@ -3,32 +3,31 @@ use core::hash::Hash;
 use indexmap::IndexMap;
 use rkyv::{Archive, Deserialize, Serialize};
 #[cfg(feature = "std")]
-use std::{collections::HashMap, hash::Hash};
+use std::hash::Hash;
 
 #[derive(Serialize, Deserialize, Archive)]
 /// Rkyv Archivable IndexMap
-pub struct ArchivableIndexMap<K: Hash + Eq + Archive, V: Archive> {
+pub struct ArchivableIndexMap<K: Hash + Ord + Archive, V: Archive> {
-    indices: HashMap<K, u64>,
     entries: Vec<(K, V)>,
 }
 
-impl<K: Hash + Eq + Archive + Clone, V: Archive> From<IndexMap<K, V>> for ArchivableIndexMap<K, V> {
+impl<K: Hash + Ord + Archive + Clone, V: Archive> From<IndexMap<K, V>>
+    for ArchivableIndexMap<K, V>
+{
     fn from(it: IndexMap<K, V>) -> ArchivableIndexMap<K, V> {
         let mut r = ArchivableIndexMap {
-            indices: HashMap::new(),
             entries: Vec::new(),
         };
-        let mut i: u64 = 0;
         for (k, v) in it.into_iter() {
-            r.indices.insert(k.clone(), i);
             r.entries.push((k, v));
-            i += 1;
         }
         r
     }
 }
 
-impl<K: Hash + Eq + Archive + Clone, V: Archive> Into<IndexMap<K, V>> for ArchivableIndexMap<K, V> {
+impl<K: Hash + Ord + Archive + Clone, V: Archive> Into<IndexMap<K, V>>
+    for ArchivableIndexMap<K, V>
+{
     fn into(self) -> IndexMap<K, V> {
         let mut r = IndexMap::new();
         for (k, v) in self.entries.into_iter() {

lib/types/src/indexes.rs

@@ -16,7 +16,7 @@ use serde::{Deserialize, Serialize};
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub struct LocalFunctionIndex(u32);
 entity_impl!(LocalFunctionIndex);
@@ -44,7 +44,7 @@ entity_impl!(LocalMemoryIndex);
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub struct LocalGlobalIndex(u32);
 entity_impl!(LocalGlobalIndex);
@@ -60,7 +60,7 @@ entity_impl!(ArchivedLocalGlobalIndex);
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub struct FunctionIndex(u32);
 entity_impl!(FunctionIndex);
@@ -76,7 +76,7 @@ entity_impl!(ArchivedFunctionIndex);
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub struct TableIndex(u32);
 entity_impl!(TableIndex);
@@ -92,7 +92,7 @@ entity_impl!(ArchivedTableIndex);
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub struct GlobalIndex(u32);
 entity_impl!(GlobalIndex);
@@ -108,7 +108,7 @@ entity_impl!(ArchivedGlobalIndex);
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub struct MemoryIndex(u32);
 entity_impl!(MemoryIndex);
@@ -124,7 +124,7 @@ entity_impl!(ArchivedMemoryIndex);
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub struct SignatureIndex(u32);
 entity_impl!(SignatureIndex);
@@ -140,7 +140,7 @@ entity_impl!(ArchivedSignatureIndex);
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub struct DataIndex(u32);
 entity_impl!(DataIndex);
@@ -156,7 +156,7 @@ entity_impl!(ArchivedDataIndex);
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub struct ElemIndex(u32);
 entity_impl!(ElemIndex);
@@ -172,7 +172,7 @@ entity_impl!(ArchivedElemIndex);
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub struct CustomSectionIndex(u32);
 entity_impl!(CustomSectionIndex);
@@ -188,7 +188,7 @@ entity_impl!(ArchivedCustomSectionIndex);
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub enum ExportIndex {
     /// Function export.
@@ -210,7 +210,7 @@ pub enum ExportIndex {
 )]
 #[cfg_attr(
     feature = "enable-rkyv",
-    archive(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
+    archive_attr(derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug))
 )]
 pub enum ImportIndex {
     /// Function import.

lib/types/src/module.rs

@@ -17,16 +17,17 @@ use indexmap::IndexMap;
 use loupe::MemoryUsage;
 #[cfg(feature = "enable-rkyv")]
 use rkyv::{
-    de::SharedDeserializer, ser::Serializer, ser::SharedSerializer, Archive, Archived,
+    de::SharedDeserializeRegistry, ser::ScratchSpace, ser::Serializer,
-    Deserialize as RkyvDeserialize, Fallible, Serialize as RkyvSerialize,
+    ser::SharedSerializeRegistry, Archive, Archived, Deserialize as RkyvDeserialize, Fallible,
+    Serialize as RkyvSerialize,
 };
 #[cfg(feature = "enable-serde")]
 use serde::{Deserialize, Serialize};
+#[cfg(feature = "enable-rkyv")]
+use std::collections::BTreeMap;
 use std::collections::HashMap;
 use std::fmt;
 use std::iter::ExactSizeIterator;
-#[cfg(feature = "enable-rkyv")]
-use std::mem::MaybeUninit;
 use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
 use std::sync::Arc;
 
@@ -142,10 +143,10 @@ pub struct ArchivableModuleInfo {
     exports: ArchivableIndexMap<String, ExportIndex>,
     start_function: Option<FunctionIndex>,
     table_initializers: Vec<TableInitializer>,
-    passive_elements: HashMap<ElemIndex, Box<[FunctionIndex]>>,
+    passive_elements: BTreeMap<ElemIndex, Box<[FunctionIndex]>>,
-    passive_data: HashMap<DataIndex, Arc<[u8]>>,
+    passive_data: BTreeMap<DataIndex, Arc<[u8]>>,
     global_initializers: PrimaryMap<LocalGlobalIndex, GlobalInit>,
-    function_names: HashMap<FunctionIndex, String>,
+    function_names: BTreeMap<FunctionIndex, String>,
     signatures: PrimaryMap<SignatureIndex, FunctionType>,
     functions: PrimaryMap<FunctionIndex, SignatureIndex>,
     tables: PrimaryMap<TableIndex, TableType>,
@@ -168,10 +169,10 @@ impl From<ModuleInfo> for ArchivableModuleInfo {
             exports: ArchivableIndexMap::from(it.exports),
             start_function: it.start_function,
             table_initializers: it.table_initializers,
-            passive_elements: it.passive_elements,
+            passive_elements: it.passive_elements.into_iter().collect(),
-            passive_data: it.passive_data,
+            passive_data: it.passive_data.into_iter().collect(),
             global_initializers: it.global_initializers,
-            function_names: it.function_names,
+            function_names: it.function_names.into_iter().collect(),
             signatures: it.signatures,
             functions: it.functions,
             tables: it.tables,
@@ -197,10 +198,10 @@ impl From<ArchivableModuleInfo> for ModuleInfo {
             exports: it.exports.into(),
             start_function: it.start_function,
             table_initializers: it.table_initializers,
-            passive_elements: it.passive_elements,
+            passive_elements: it.passive_elements.into_iter().collect(),
-            passive_data: it.passive_data,
+            passive_data: it.passive_data.into_iter().collect(),
             global_initializers: it.global_initializers,
-            function_names: it.function_names,
+            function_names: it.function_names.into_iter().collect(),
             signatures: it.signatures,
             functions: it.functions,
             tables: it.tables,
@@ -228,20 +229,22 @@ impl Archive for ModuleInfo {
     type Archived = <ArchivableModuleInfo as Archive>::Archived;
     type Resolver = <ArchivableModuleInfo as Archive>::Resolver;
 
-    fn resolve(&self, pos: usize, resolver: Self::Resolver, out: &mut MaybeUninit<Self::Archived>) {
+    unsafe fn resolve(&self, pos: usize, resolver: Self::Resolver, out: *mut Self::Archived) {
         ArchivableModuleInfo::from(self).resolve(pos, resolver, out)
     }
 }
 
 #[cfg(feature = "enable-rkyv")]
-impl<S: Serializer + SharedSerializer + ?Sized> RkyvSerialize<S> for ModuleInfo {
+impl<S: Serializer + SharedSerializeRegistry + ScratchSpace + ?Sized> RkyvSerialize<S>
+    for ModuleInfo
+{
     fn serialize(&self, serializer: &mut S) -> Result<Self::Resolver, S::Error> {
         ArchivableModuleInfo::from(self).serialize(serializer)
     }
 }
 
 #[cfg(feature = "enable-rkyv")]
-impl<D: Fallible + ?Sized + SharedDeserializer> RkyvDeserialize<ModuleInfo, D>
+impl<D: Fallible + ?Sized + SharedDeserializeRegistry> RkyvDeserialize<ModuleInfo, D>
     for Archived<ModuleInfo>
 {
     fn deserialize(&self, deserializer: &mut D) -> Result<ModuleInfo, D::Error> {

lib/vm/Cargo.toml

@@ -21,7 +21,7 @@ more-asserts = "0.2"
 cfg-if = "1.0"
 backtrace = "0.3"
 serde = { version = "1.0", features = ["derive", "rc"] }
-rkyv = { version = "0.6.1", optional = true}
+rkyv = { version = "0.7.20", optional = true }
 loupe = { version = "0.1", features = ["enable-indexmap"] }
 
 [target.'cfg(target_os = "windows")'.dependencies]

lib/vm/src/trap/traphandlers.rs

@@ -99,13 +99,16 @@ cfg_if::cfg_if! {
         unsafe fn thread_stack() -> (usize, usize) {
             let this_thread = libc::pthread_self();
             let mut thread_attrs: libc::pthread_attr_t = mem::zeroed();
-            #[cfg(not(target_os = "freebsd"))]
-            libc::pthread_getattr_np(this_thread, &mut thread_attrs);
-            #[cfg(target_os = "freebsd")]
-            libc::pthread_attr_get_np(this_thread, &mut thread_attrs);
             let mut stackaddr: *mut libc::c_void = ptr::null_mut();
             let mut stacksize: libc::size_t = 0;
-            libc::pthread_attr_getstack(&thread_attrs, &mut stackaddr, &mut stacksize);
+            #[cfg(not(target_os = "freebsd"))]
+            let ok = libc::pthread_getattr_np(this_thread, &mut thread_attrs);
+            #[cfg(target_os = "freebsd")]
+            let ok = libc::pthread_attr_get_np(this_thread, &mut thread_attrs);
+            if ok == 0 {
+                libc::pthread_attr_getstack(&thread_attrs, &mut stackaddr, &mut stacksize);
+                libc::pthread_attr_destroy(&mut thread_attrs);
+            }
             (stackaddr as usize, stacksize)
         }
 

rust-toolchain

@@ -1 +1 @@
-1.53
+1.56

tests/compilers/deterministic.rs

@@ -0,0 +1,44 @@
+use anyhow::Result;
+use wasmer::{wat2wasm, Module};
+
+fn compile_and_compare(wasm: &[u8]) -> Result<()> {
+    let store = Default::default();
+
+    // compile for first time
+    let module = Module::new(&store, wasm)?;
+    let first = module.serialize()?;
+
+    // compile for second time
+    let module = Module::new(&store, wasm)?;
+    let second = module.serialize()?;
+
+    assert!(first == second);
+
+    Ok(())
+}
+
+#[test]
+fn deterministic_empty() -> Result<()> {
+    let wasm_bytes = wat2wasm(
+        br#"
+    (module)
+    "#,
+    )?;
+
+    compile_and_compare(&wasm_bytes)
+}
+
+#[test]
+fn deterministic_table() -> Result<()> {
+    let wasm_bytes = wat2wasm(
+        br#"
+(module
+  (table 2 funcref)
+  (func $f1)
+  (func $f2)
+  (elem (i32.const 0) $f1 $f2))
+"#,
+    )?;
+
+    compile_and_compare(&wasm_bytes)
+}

tests/compilers/main.rs

@@ -6,6 +6,7 @@
 extern crate compiler_test_derive;
 
 mod config;
+mod deterministic;
 mod imports;
 mod issues;
 mod metering;

tests/compilers/traps.rs

@@ -257,7 +257,9 @@ fn trap_start_function_import(config: crate::Config) -> Result<()> {
     .err()
     .unwrap();
     match err {
-        InstantiationError::Link(_) | InstantiationError::HostEnvInitialization(_) => {
+        InstantiationError::Link(_)
+        | InstantiationError::HostEnvInitialization(_)
+        | InstantiationError::CpuFeature(_) => {
             panic!("It should be a start error")
         }
         InstantiationError::Start(err) => {

tests/ignores.txt

@@ -70,7 +70,7 @@ cranelift spec::simd::simd_i8x16_arith2
 cranelift spec::simd::simd_int_to_int_extend
 
 # Windows doesn't overcommit and fails to allocate 4GB of memory
-windows wast::wasmer::max_size_of_memory
+windows wasmer::max_size_of_memory
 
 # Frontends
 

tests/lib/engine-dummy/Cargo.toml

@@ -16,19 +16,14 @@ serde = { version = "1.0", features = ["derive", "rc"], optional = true }
 serde_bytes = { version = "0.11", optional = true }
 bincode = { version = "1.2", optional = true }
 loupe = "0.1"
+enumset = "1.0"
 
 [features]
 # Enable the `compiler` feature if you want the engine to compile
 # and not be only on headless mode.
 default = ["serialize", "compiler"]
-compiler = [
+compiler = ["wasmer-compiler/translator"]
-    "wasmer-compiler/translator"
+serialize = ["serde", "serde_bytes", "bincode"]
-]
-serialize = [
-    "serde",
-    "serde_bytes",
-    "bincode"
-]
 
 [badges]
 # TODO: publish this crate again and deprecate it

tests/lib/engine-dummy/src/artifact.rs

@@ -2,13 +2,14 @@
 //! done as separate steps.
 
 use crate::engine::DummyEngine;
+use enumset::EnumSet;
 use loupe::MemoryUsage;
 #[cfg(feature = "serialize")]
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
-use wasmer_compiler::CompileError;
 #[cfg(feature = "compiler")]
 use wasmer_compiler::ModuleEnvironment;
+use wasmer_compiler::{CompileError, CpuFeature};
 use wasmer_engine::{Artifact, DeserializeError, Engine as _, SerializeError, Tunables};
 use wasmer_types::entity::{BoxedSlice, PrimaryMap};
 use wasmer_types::{
@@ -30,6 +31,7 @@ pub struct DummyArtifactMetadata {
     // Plans for that module
     pub memory_styles: PrimaryMap<MemoryIndex, MemoryStyle>,
     pub table_styles: PrimaryMap<TableIndex, TableStyle>,
+    pub cpu_features: u64,
 }
 
 /// A Dummy artifact.
@@ -104,6 +106,7 @@ impl DummyArtifact {
             data_initializers,
             memory_styles,
             table_styles,
+            cpu_features: engine.target().cpu_features().as_u64(),
         };
         Self::from_parts(&engine, metadata)
     }
@@ -211,6 +214,10 @@ impl Artifact for DummyArtifact {
         &self.metadata.features
     }
 
+    fn cpu_features(&self) -> EnumSet<CpuFeature> {
+        EnumSet::from_u64(self.metadata.cpu_features)
+    }
+
     fn data_initializers(&self) -> &[OwnedDataInitializer] {
         &*self.metadata.data_initializers
     }