Merge branch 'master' into fix-c-api-wasi-version

CHANGELOG.md

@@ -8,7 +8,10 @@
 ## **[Unreleased]**
 
 ### Added
+- [#2059](https://github.com/wasmerio/wasmer/pull/2059) Ability to capture `stdout` and `stderr` with WASI in the C API.
+- [#2040](https://github.com/wasmerio/wasmer/pull/2040) Add `InstanceHandle::vmoffsets` to expose the offsets of the `vmctx` region.
 - [#2026](https://github.com/wasmerio/wasmer/pull/2010) Expose trap code of a `RuntimeError`, if it's a `Trap`.
+- [#2054](https://github.com/wasmerio/wasmer/pull/2054) Add `wasm_config_delete` to the Wasm C API.
 
 ### Changed
 - [#2042](https://github.com/wasmerio/wasmer/pull/2042) Parse more exotic environment variables in `wasmer run`.

Cargo.lock

@@ -93,12 +93,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "autocfg"
-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d49d90015b3c36167a20fe2810c5cd875ad504b39cff3d4eae7977e6b7c1cb2"
-
 [[package]]
 name = "autocfg"
 version = "1.0.1"
@@ -268,12 +262,12 @@ dependencies = [
 ]
 
 [[package]]
-name = "cloudabi"
+name = "cmake"
-version = "0.0.3"
+version = "0.1.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
+checksum = "eb6210b637171dfba4cda12e579ac6dc73f5165ad56133e5d72ef3131f320855"
 dependencies = [
- "bitflags",
+ "cc",
 ]
 
 [[package]]
@@ -536,7 +530,7 @@ version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "02d96d1e189ef58269ebe5b97953da3274d83a93af647c2ddd6f9dab28cedb8d"
 dependencies = [
- "autocfg 1.0.1",
+ "autocfg",
  "cfg-if 1.0.0",
  "lazy_static",
 ]
@@ -710,6 +704,15 @@ version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
+[[package]]
+name = "encoding_rs"
+version = "0.8.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "801bbab217d7f79c0062f4f7205b5d4427c6d1a7bd7aafdd1475f7c59d62b283"
+dependencies = [
+ "cfg-if 1.0.0",
+]
+
 [[package]]
 name = "enumset"
 version = "1.0.2"
@@ -764,10 +767,22 @@ checksum = "0c122a393ea57648015bf06fbd3d372378992e86b9ff5a7a497b076a28c79efe"
 dependencies = [
  "cfg-if 1.0.0",
  "libc",
- "redox_syscall",
+ "redox_syscall 0.1.57",
  "winapi",
 ]
 
+[[package]]
+name = "flate2"
+version = "1.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7411863d55df97a419aa64cb4d2f167103ea9d767e2c54a1868b7ac3f6b47129"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crc32fast",
+ "libc",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "float-cmp"
 version = "0.8.0"
@@ -783,12 +798,6 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
-[[package]]
-name = "fuchsia-cprng"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
-
 [[package]]
 name = "generational-arena"
 version = "0.2.8"
@@ -907,7 +916,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "96282e96bfcd3da0d3aa9938bedf1e50df3269b6db08b4876d2da0bb1a0841cf"
 dependencies = [
  "ahash 0.3.8",
- "autocfg 1.0.1",
+ "autocfg",
 ]
 
 [[package]]
@@ -955,7 +964,7 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55e2e4c765aa53a0424761bf9f41aa7a6ac1efa87238f59560640e27fca028f2"
 dependencies = [
- "autocfg 1.0.1",
+ "autocfg",
  "hashbrown 0.9.1",
  "serde",
 ]
@@ -1200,7 +1209,7 @@ version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "157b4208e3059a8f9e78d559edc658e13df41410cb3ae03979c83130067fdd87"
 dependencies = [
- "autocfg 1.0.1",
+ "autocfg",
 ]
 
 [[package]]
@@ -1229,7 +1238,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0f2d26ec3309788e423cfbf68ad1800f061638098d76a83681af979dc4eda19d"
 dependencies = [
  "adler",
- "autocfg 1.0.1",
+ "autocfg",
 ]
 
 [[package]]
@@ -1277,45 +1286,13 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "61807f77802ff30975e01f4f071c8ba10c022052f98b3294119f3e615d13e5be"
 
-[[package]]
-name = "num"
-version = "0.1.42"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4703ad64153382334aa8db57c637364c322d3372e097840c72000dabdcf6156e"
-dependencies = [
- "num-integer",
- "num-iter",
- "num-traits",
-]
-
-[[package]]
-name = "num-integer"
-version = "0.1.44"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
-dependencies = [
- "autocfg 1.0.1",
- "num-traits",
-]
-
-[[package]]
-name = "num-iter"
-version = "0.1.42"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2021c8337a54d21aca0d59a92577a029af9431cb59b909b03252b9c164fad59"
-dependencies = [
- "autocfg 1.0.1",
- "num-integer",
- "num-traits",
-]
-
 [[package]]
 name = "num-traits"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
 dependencies = [
- "autocfg 1.0.1",
+ "autocfg",
 ]
 
 [[package]]
@@ -1352,12 +1329,15 @@ checksum = "0ab1bc2a289d34bd04a330323ac98a1b4bc82c9d9fcb1e66b63caa84da26b575"
 
 [[package]]
 name = "orbclient"
-version = "0.3.27"
+version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f8b18f57ab94fbd058e30aa57f712ec423c0bb7403f8493a6c58eef0c36d9402"
+checksum = "ee68c3c79e81d82127e0870f94479675774d34c7ad5b55eecb9c320ef9701187"
 dependencies = [
- "redox_syscall",
+ "libc",
+ "raw-window-handle",
+ "redox_syscall 0.2.4",
  "sdl2",
+ "sdl2-sys",
 ]
 
 [[package]]
@@ -1380,7 +1360,7 @@ dependencies = [
  "cfg-if 1.0.0",
  "instant",
  "libc",
- "redox_syscall",
+ "redox_syscall 0.1.57",
  "smallvec",
  "winapi",
 ]
@@ -1507,25 +1487,6 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "rand"
-version = "0.6.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d71dacdc3c88c1fde3885a3be3fbab9f35724e6ce99467f7d9c5026132184ca"
-dependencies = [
- "autocfg 0.1.7",
- "libc",
- "rand_chacha 0.1.1",
- "rand_core 0.4.2",
- "rand_hc 0.1.0",
- "rand_isaac",
- "rand_jitter",
- "rand_os",
- "rand_pcg",
- "rand_xorshift",
- "winapi",
-]
-
 [[package]]
 name = "rand"
 version = "0.7.3"
@@ -1534,19 +1495,9 @@ checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 dependencies = [
  "getrandom 0.1.15",
  "libc",
- "rand_chacha 0.2.2",
+ "rand_chacha",
- "rand_core 0.5.1",
+ "rand_core",
- "rand_hc 0.2.0",
+ "rand_hc",
-]
-
-[[package]]
-name = "rand_chacha"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "556d3a1ca6600bfcbab7c7c91ccb085ac7fbbcd70e008a98742e7847f4f7bcef"
-dependencies = [
- "autocfg 0.1.7",
- "rand_core 0.3.1",
 ]
 
 [[package]]
@@ -1556,24 +1507,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
+ "rand_core",
 ]
 
-[[package]]
-name = "rand_core"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a6fdeb83b075e8266dcc8762c22776f6877a63111121f5f8c7411e5be7eed4b"
-dependencies = [
- "rand_core 0.4.2",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c33a3c44ca05fa6f1807d8e6743f3824e8509beca625669633be0acbdf509dc"
-
 [[package]]
 name = "rand_core"
 version = "0.5.1"
@@ -1583,75 +1519,13 @@ dependencies = [
  "getrandom 0.1.15",
 ]
 
-[[package]]
-name = "rand_hc"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b40677c7be09ae76218dc623efbf7b18e34bced3f38883af07bb75630a21bc4"
-dependencies = [
- "rand_core 0.3.1",
-]
-
 [[package]]
 name = "rand_hc"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
 dependencies = [
- "rand_core 0.5.1",
+ "rand_core",
-]
-
-[[package]]
-name = "rand_isaac"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ded997c9d5f13925be2a6fd7e66bf1872597f759fd9dd93513dd7e92e5a5ee08"
-dependencies = [
- "rand_core 0.3.1",
-]
-
-[[package]]
-name = "rand_jitter"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1166d5c91dc97b88d1decc3285bb0a99ed84b05cfd0bc2341bdf2d43fc41e39b"
-dependencies = [
- "libc",
- "rand_core 0.4.2",
- "winapi",
-]
-
-[[package]]
-name = "rand_os"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b75f676a1e053fc562eafbb47838d67c84801e38fc1ba459e8f180deabd5071"
-dependencies = [
- "cloudabi",
- "fuchsia-cprng",
- "libc",
- "rand_core 0.4.2",
- "rdrand",
- "winapi",
-]
-
-[[package]]
-name = "rand_pcg"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "abf9b09b01790cfe0364f52bf32995ea3c39f4d2dd011eac241d2914146d0b44"
-dependencies = [
- "autocfg 0.1.7",
- "rand_core 0.4.2",
-]
-
-[[package]]
-name = "rand_xorshift"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cbf7e9e623549b0e21f6e97cf8ecf247c1a8fd2e8a992ae265314300b2455d5c"
-dependencies = [
- "rand_core 0.3.1",
 ]
 
 [[package]]
@@ -1678,7 +1552,7 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b0d8e0819fadc20c74ea8373106ead0600e3a67ef1fe8da56e39b9ae7275674"
 dependencies = [
- "autocfg 1.0.1",
+ "autocfg",
  "crossbeam-deque",
  "either",
  "rayon-core",
@@ -1697,21 +1571,21 @@ dependencies = [
  "num_cpus",
 ]
 
-[[package]]
-name = "rdrand"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
-dependencies = [
- "rand_core 0.3.1",
-]
-
 [[package]]
 name = "redox_syscall"
 version = "0.1.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
 
+[[package]]
+name = "redox_syscall"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05ec8ca9416c5ea37062b502703cd7fcb207736bc294f6e0cf367ac6fc234570"
+dependencies = [
+ "bitflags",
+]
+
 [[package]]
 name = "redox_users"
 version = "0.3.5"
@@ -1719,7 +1593,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "de0737333e7a9502c789a36d7c7fa6092a49895d4faa31ca5df163857ded2e9d"
 dependencies = [
  "getrandom 0.1.15",
- "redox_syscall",
+ "redox_syscall 0.1.57",
  "rust-argon2",
 ]
 
@@ -1896,26 +1770,30 @@ dependencies = [
 
 [[package]]
 name = "sdl2"
-version = "0.32.2"
+version = "0.34.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d051a07231e303f5f719da78cb6f7394f6d5b54f733aef5b0b447804a83edd7b"
+checksum = "fcbb85f4211627a7291c83434d6bbfa723e28dcaa53c7606087e3c61929e4b9c"
 dependencies = [
  "bitflags",
  "lazy_static",
  "libc",
- "num",
+ "raw-window-handle",
- "rand 0.6.5",
  "sdl2-sys",
 ]
 
 [[package]]
 name = "sdl2-sys"
-version = "0.32.6"
+version = "0.34.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "34e71125077d297d57e4c1acfe8981b5bdfbf5a20e7b589abfdcb33bf1127f86"
+checksum = "28d81feded049b9c14eceb4a4f6d596a98cebbd59abdba949c5552a015466d33"
 dependencies = [
  "cfg-if 0.1.10",
+ "cmake",
+ "flate2",
  "libc",
+ "tar",
+ "unidiff",
+ "version-compare",
 ]
 
 [[package]]
@@ -2015,7 +1893,7 @@ checksum = "2c29947abdee2a218277abeca306f25789c938e500ea5a9d4b12a5a504466902"
 dependencies = [
  "cfg-if 1.0.0",
  "libc",
- "redox_syscall",
+ "redox_syscall 0.1.57",
  "winapi",
 ]
 
@@ -2078,6 +1956,17 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "tar"
+version = "0.4.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0313546c01d59e29be4f09687bcb4fb6690cec931cc3607b6aec7a0e417f4cc6"
+dependencies = [
+ "filetime",
+ "libc",
+ "xattr",
+]
+
 [[package]]
 name = "target-lexicon"
 version = "0.11.1"
@@ -2092,8 +1981,8 @@ checksum = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
 dependencies = [
  "cfg-if 0.1.10",
  "libc",
- "rand 0.7.3",
+ "rand",
- "redox_syscall",
+ "redox_syscall 0.1.57",
  "remove_dir_all",
  "winapi",
 ]
@@ -2288,12 +2177,29 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
 
+[[package]]
+name = "unidiff"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8a62719acf1933bfdbeb73a657ecd9ecece70b405125267dd549e2e2edc232c"
+dependencies = [
+ "encoding_rs",
+ "lazy_static",
+ "regex",
+]
+
 [[package]]
 name = "vec_map"
 version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
 
+[[package]]
+name = "version-compare"
+version = "0.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d63556a25bae6ea31b52e640d7c41d1ab27faba4ccb600013837a3d0b3994ca1"
+
 [[package]]
 name = "version_check"
 version = "0.9.2"
@@ -2973,6 +2879,15 @@ dependencies = [
  "pkg-config",
 ]
 
+[[package]]
+name = "xattr"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "244c3741f4240ef46274860397c7c74e50eb23624996930e484c16679633a54c"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "xcursor"
 version = "0.3.3"

lib/api/src/native.rs

@@ -100,7 +100,7 @@ where
         Self {
             store: other.store,
             definition: other.definition,
-            exported: other.exported.clone(),
+            exported: other.exported,
         }
     }
 }

lib/c-api/build.rs

@@ -240,6 +240,7 @@ fn new_builder(language: Language, crate_dir: &str, include_guard: &str, header:
     Builder::new()
         .with_config(cbindgen::Config {
             sort_by: cbindgen::SortKey::Name,
+            cpp_compat: true,
             ..cbindgen::Config::default()
         })
         .with_language(language)
@@ -401,13 +402,16 @@ fn exclude_items_from_deprecated(builder: Builder) -> Builder {
 fn exclude_items_from_wasm_c_api(builder: Builder) -> Builder {
     builder
         .exclude_item("wasi_config_arg")
+        .exclude_item("wasi_config_capture_stderr")
+        .exclude_item("wasi_config_capture_stdin")
+        .exclude_item("wasi_config_capture_stdout")
         .exclude_item("wasi_config_env")
-        .exclude_item("wasi_config_mapdir")
-        .exclude_item("wasi_config_preopen_dir")
         .exclude_item("wasi_config_inherit_stderr")
         .exclude_item("wasi_config_inherit_stdin")
         .exclude_item("wasi_config_inherit_stdout")
+        .exclude_item("wasi_config_mapdir")
         .exclude_item("wasi_config_new")
+        .exclude_item("wasi_config_preopen_dir")
         .exclude_item("wasi_config_t")
         .exclude_item("wasi_env_delete")
         .exclude_item("wasi_env_new")

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

@@ -131,6 +131,36 @@ pub extern "C" fn wasm_config_new() -> Box<wasm_config_t> {
     Box::new(wasm_config_t::default())
 }
 
+/// Delete a Wasmer config object.
+///
+/// This function does not need to be called if `wasm_engine_new_with_config` or
+/// another function that takes ownership of the `wasm_config_t` is called.
+///
+/// # Example
+///
+/// ```rust
+/// # use inline_c::assert_c;
+/// # fn main() {
+/// #    (assert_c! {
+/// # #include "tests/wasmer_wasm.h"
+/// #
+/// int main() {
+///     // Create the configuration.
+///     wasm_config_t* config = wasm_config_new();
+///
+///     // Delete the configuration
+///     wasm_config_delete(config);
+///
+///     return 0;
+/// }
+/// #    })
+/// #    .success();
+/// # }
+/// ```
+/// cbindgen:ignore
+#[no_mangle]
+pub extern "C" fn wasm_config_delete(_config: Option<Box<wasm_config_t>>) {}
+
 /// Updates the configuration to specify a particular compiler to use.
 ///
 /// This is a Wasmer-specific function.

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

@@ -23,13 +23,12 @@ use wasmer_wasi::{
     WasiStateBuilder, WasiVersion,
 };
 
-#[derive(Debug, Default)]
+#[derive(Debug)]
 #[allow(non_camel_case_types)]
 pub struct wasi_config_t {
     inherit_stdout: bool,
     inherit_stderr: bool,
     inherit_stdin: bool,
-    /// cbindgen:ignore
     state_builder: WasiStateBuilder,
 }
 
@@ -43,8 +42,10 @@ pub unsafe extern "C" fn wasi_config_new(
     let prog_name = c_try!(name_c_str.to_str());
 
     Some(Box::new(wasi_config_t {
+        inherit_stdout: true,
+        inherit_stderr: true,
+        inherit_stdin: true,
         state_builder: WasiState::new(prog_name),
-        ..wasi_config_t::default()
     }))
 }
 
@@ -132,14 +133,31 @@ pub unsafe extern "C" fn wasi_config_mapdir(
     true
 }
 
+#[no_mangle]
+pub extern "C" fn wasi_config_capture_stdout(config: &mut wasi_config_t) {
+    config.inherit_stdout = false;
+}
+
 #[no_mangle]
 pub extern "C" fn wasi_config_inherit_stdout(config: &mut wasi_config_t) {
     config.inherit_stdout = true;
 }
+
+#[no_mangle]
+pub extern "C" fn wasi_config_capture_stderr(config: &mut wasi_config_t) {
+    config.inherit_stderr = false;
+}
+
 #[no_mangle]
 pub extern "C" fn wasi_config_inherit_stderr(config: &mut wasi_config_t) {
     config.inherit_stderr = true;
 }
+
+//#[no_mangle]
+//pub extern "C" fn wasi_config_capture_stdin(config: &mut wasi_config_t) {
+//    config.inherit_stdin = false;
+//}
+
 #[no_mangle]
 pub extern "C" fn wasi_config_inherit_stdin(config: &mut wasi_config_t) {
     config.inherit_stdin = true;
@@ -154,18 +172,22 @@ pub struct wasi_env_t {
 /// Takes ownership over the `wasi_config_t`.
 #[no_mangle]
 pub extern "C" fn wasi_env_new(mut config: Box<wasi_config_t>) -> Option<Box<wasi_env_t>> {
-    if config.inherit_stdout {
+    if !config.inherit_stdout {
         config
             .state_builder
             .stdout(Box::new(capture_files::OutputCapturer::new()));
     }
-    if config.inherit_stderr {
+
+    if !config.inherit_stderr {
         config
             .state_builder
             .stderr(Box::new(capture_files::OutputCapturer::new()));
     }
+
     // TODO: impl capturer for stdin
+
     let wasi_state = c_try!(config.state_builder.build());
+
     Some(Box::new(wasi_env_t {
         inner: WasiEnv::new(wasi_state),
     }))

lib/c-api/wasmer.h

@@ -55,7 +55,11 @@
 #include <stdlib.h>
 
 #if defined(WASMER_WASI_ENABLED)
-enum Version {
+enum Version
+#ifdef __cplusplus
+  : uint8_t
+#endif // __cplusplus
+ {
 #if defined(WASMER_WASI_ENABLED)
   /**
    * Version cannot be detected or is unknown.
@@ -82,13 +86,19 @@ enum Version {
   Snapshot1 = 3,
 #endif
 };
+#ifndef __cplusplus
 typedef uint8_t Version;
+#endif // __cplusplus
 #endif
 
 /**
  * List of export/import kinds.
  */
-enum wasmer_import_export_kind {
+enum wasmer_import_export_kind
+#ifdef __cplusplus
+  : uint32_t
+#endif // __cplusplus
+ {
   /**
    * The export/import is a function.
    */
@@ -106,7 +116,9 @@ enum wasmer_import_export_kind {
    */
   WASM_TABLE = 3,
 };
+#ifndef __cplusplus
 typedef uint32_t wasmer_import_export_kind;
+#endif // __cplusplus
 
 /**
  * The `wasmer_result_t` enum is a type that represents either a
@@ -128,7 +140,11 @@ typedef enum {
  *
  * See `wasmer_value_t` to get a complete example.
  */
-enum wasmer_value_tag {
+enum wasmer_value_tag
+#ifdef __cplusplus
+  : uint32_t
+#endif // __cplusplus
+ {
   /**
    * Represents the `i32` WebAssembly type.
    */
@@ -146,7 +162,9 @@ enum wasmer_value_tag {
    */
   WASM_F64,
 };
+#ifndef __cplusplus
 typedef uint32_t wasmer_value_tag;
+#endif // __cplusplus
 
 typedef struct {
 
@@ -409,6 +427,10 @@ typedef struct {
 } wasmer_wasi_map_dir_entry_t;
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
 /**
  * Creates a new Module from the given wasm bytes.
  *
@@ -1579,4 +1601,8 @@ wasmer_import_object_t *wasmer_wasi_generate_import_object_for_version(unsigned
 Version wasmer_wasi_get_version(const wasmer_module_t *module);
 #endif
 
+#ifdef __cplusplus
+} // extern "C"
+#endif // __cplusplus
+
 #endif /* WASMER_H */

lib/c-api/wasmer_wasm.h

@@ -162,10 +162,26 @@ typedef struct wasi_config_t wasi_config_t;
 typedef struct wasi_env_t wasi_env_t;
 #endif
 
+#if defined(WASMER_WASI_ENABLED)
+typedef struct wasi_version_t wasi_version_t;
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
 #if defined(WASMER_WASI_ENABLED)
 void wasi_config_arg(wasi_config_t *config, const char *arg);
 #endif
 
+#if defined(WASMER_WASI_ENABLED)
+void wasi_config_capture_stderr(wasi_config_t *config);
+#endif
+
+#if defined(WASMER_WASI_ENABLED)
+void wasi_config_capture_stdout(wasi_config_t *config);
+#endif
+
 #if defined(WASMER_WASI_ENABLED)
 void wasi_config_env(wasi_config_t *config, const char *key, const char *value);
 #endif
@@ -597,4 +613,8 @@ const char *wasmer_version_pre(void);
  */
 void wat2wasm(const wasm_byte_vec_t *wat, wasm_byte_vec_t *out);
 
+#ifdef __cplusplus
+} // extern "C"
+#endif // __cplusplus
+
 #endif /* WASMER_WASM_H */

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

@@ -10,6 +10,9 @@ use inkwell::{
 };
 use wasmer_compiler::CompileError;
 use wasmer_types::{FunctionType as FuncSig, Type};
+use wasmer_vm::VMOffsets;
+
+use std::convert::TryInto;
 
 /// Implementation of the [`Abi`] trait for the Aarch64 ABI on Linux.
 pub struct Aarch64SystemV {}
@@ -40,6 +43,7 @@ impl Abi for Aarch64SystemV {
         &self,
         context: &'ctx Context,
         intrinsics: &Intrinsics<'ctx>,
+        offsets: Option<&VMOffsets>,
         sig: &FuncSig,
     ) -> Result<(FunctionType<'ctx>, Vec<(Attribute, AttributeLoc)>), CompileError> {
         let user_param_types = sig.params().iter().map(|&ty| type_to_llvm(intrinsics, ty));
@@ -47,19 +51,49 @@ impl Abi for Aarch64SystemV {
         let param_types =
             std::iter::once(Ok(intrinsics.ctx_ptr_ty.as_basic_type_enum())).chain(user_param_types);
 
+        let vmctx_attributes = |i: u32| {
+            vec![
+                (
+                    context.create_enum_attribute(Attribute::get_named_enum_kind_id("nofree"), 0),
+                    AttributeLoc::Param(i),
+                ),
+                (
+                    if let Some(offsets) = offsets {
+                        context.create_enum_attribute(
+                            Attribute::get_named_enum_kind_id("dereferenceable"),
+                            offsets.size_of_vmctx().into(),
+                        )
+                    } else {
+                        context
+                            .create_enum_attribute(Attribute::get_named_enum_kind_id("nonnull"), 0)
+                    },
+                    AttributeLoc::Param(i),
+                ),
+                (
+                    context.create_enum_attribute(
+                        Attribute::get_named_enum_kind_id("align"),
+                        std::mem::align_of::<wasmer_vm::VMContext>()
+                            .try_into()
+                            .unwrap(),
+                    ),
+                    AttributeLoc::Param(i),
+                ),
+            ]
+        };
+
         Ok(match sig.results() {
             [] => (
                 intrinsics
                     .void_ty
                     .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                vec![],
+                vmctx_attributes(0),
             ),
             [_] => {
                 let single_value = sig.results()[0];
                 (
                     type_to_llvm(intrinsics, single_value)?
                         .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                    vec![],
+                    vmctx_attributes(0),
                 )
             }
             [Type::F32, Type::F32] => {
@@ -68,7 +102,7 @@ impl Abi for Aarch64SystemV {
                     context
                         .struct_type(&[f32_ty, f32_ty], false)
                         .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                    vec![],
+                    vmctx_attributes(0),
                 )
             }
             [Type::F64, Type::F64] => {
@@ -77,7 +111,7 @@ impl Abi for Aarch64SystemV {
                     context
                         .struct_type(&[f64_ty, f64_ty], false)
                         .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                    vec![],
+                    vmctx_attributes(0),
                 )
             }
             [Type::F32, Type::F32, Type::F32] => {
@@ -86,7 +120,7 @@ impl Abi for Aarch64SystemV {
                     context
                         .struct_type(&[f32_ty, f32_ty, f32_ty], false)
                         .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                    vec![],
+                    vmctx_attributes(0),
                 )
             }
             [Type::F32, Type::F32, Type::F32, Type::F32] => {
@@ -95,7 +129,7 @@ impl Abi for Aarch64SystemV {
                     context
                         .struct_type(&[f32_ty, f32_ty, f32_ty, f32_ty], false)
                         .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                    vec![],
+                    vmctx_attributes(0),
                 )
             }
             _ => {
@@ -115,7 +149,7 @@ impl Abi for Aarch64SystemV {
                         intrinsics
                             .i64_ty
                             .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                        vec![],
+                        vmctx_attributes(0),
                     ),
                     [32, 64]
                     | [64, 32]
@@ -128,7 +162,7 @@ impl Abi for Aarch64SystemV {
                             .i64_ty
                             .array_type(2)
                             .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                        vec![],
+                        vmctx_attributes(0),
                     ),
                     _ => {
                         let basic_types: Vec<_> = sig
@@ -144,17 +178,20 @@ impl Abi for Aarch64SystemV {
                         let param_types =
                             std::iter::once(Ok(sret.as_basic_type_enum())).chain(param_types);
 
+                        let mut attributes = vec![(
+                            context.create_enum_attribute(
+                                Attribute::get_named_enum_kind_id("sret"),
+                                0,
+                            ),
+                            AttributeLoc::Param(0),
+                        )];
+                        attributes.append(&mut vmctx_attributes(1));
+
                         (
                             intrinsics
                                 .void_ty
                                 .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                            vec![(
+                            attributes,
-                                context.create_enum_attribute(
-                                    Attribute::get_named_enum_kind_id("sret"),
-                                    0,
-                                ),
-                                AttributeLoc::Param(0),
-                            )],
                         )
                     }
                 }
@@ -393,17 +430,18 @@ impl Abi for Aarch64SystemV {
             })
             .collect::<Result<Vec<i32>, _>>()?;
 
-        Ok(!matches!(func_sig_returns_bitwidths.as_slice(),
+        Ok(!matches!(
-            []
+            func_sig_returns_bitwidths.as_slice(),
-            | [_]
+            [] | [_]
-            | [32, 32]
+                | [32, 32]
-            | [32, 64]
+                | [32, 64]
-            | [64, 32]
+                | [64, 32]
-            | [64, 64]
+                | [64, 64]
-            | [32, 32, 32]
+                | [32, 32, 32]
-            | [32, 32, 64]
+                | [32, 32, 64]
-            | [64, 32, 32]
+                | [64, 32, 32]
-            | [32, 32, 32, 32]))
+                | [32, 32, 32, 32]
+        ))
     }
 
     fn pack_values_for_register_return<'ctx>(

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

@@ -16,6 +16,7 @@ use inkwell::{
 };
 use wasmer_compiler::CompileError;
 use wasmer_types::FunctionType as FuncSig;
+use wasmer_vm::VMOffsets;
 
 mod aarch64_systemv;
 mod x86_64_systemv;
@@ -49,6 +50,7 @@ pub trait Abi {
         &self,
         context: &'ctx Context,
         intrinsics: &Intrinsics<'ctx>,
+        offsets: Option<&VMOffsets>,
         sig: &FuncSig,
     ) -> Result<(FunctionType<'ctx>, Vec<(Attribute, AttributeLoc)>), CompileError>;
 

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

@@ -13,6 +13,9 @@ use inkwell::{
 };
 use wasmer_compiler::CompileError;
 use wasmer_types::{FunctionType as FuncSig, Type};
+use wasmer_vm::VMOffsets;
+
+use std::convert::TryInto;
 
 /// Implementation of the [`Abi`] trait for the AMD64 SystemV ABI.
 pub struct X86_64SystemV {}
@@ -43,6 +46,7 @@ impl Abi for X86_64SystemV {
         &self,
         context: &'ctx Context,
         intrinsics: &Intrinsics<'ctx>,
+        offsets: Option<&VMOffsets>,
         sig: &FuncSig,
     ) -> Result<(FunctionType<'ctx>, Vec<(Attribute, AttributeLoc)>), CompileError> {
         let user_param_types = sig.params().iter().map(|&ty| type_to_llvm(intrinsics, ty));
@@ -50,6 +54,37 @@ impl Abi for X86_64SystemV {
         let param_types =
             std::iter::once(Ok(intrinsics.ctx_ptr_ty.as_basic_type_enum())).chain(user_param_types);
 
+        // TODO: figure out how many bytes long vmctx is, and mark it dereferenceable. (no need to mark it nonnull once we do this.)
+        let vmctx_attributes = |i: u32| {
+            vec![
+                (
+                    context.create_enum_attribute(Attribute::get_named_enum_kind_id("nofree"), 0),
+                    AttributeLoc::Param(i),
+                ),
+                (
+                    if let Some(offsets) = offsets {
+                        context.create_enum_attribute(
+                            Attribute::get_named_enum_kind_id("dereferenceable"),
+                            offsets.size_of_vmctx().into(),
+                        )
+                    } else {
+                        context
+                            .create_enum_attribute(Attribute::get_named_enum_kind_id("nonnull"), 0)
+                    },
+                    AttributeLoc::Param(i),
+                ),
+                (
+                    context.create_enum_attribute(
+                        Attribute::get_named_enum_kind_id("align"),
+                        std::mem::align_of::<wasmer_vm::VMContext>()
+                            .try_into()
+                            .unwrap(),
+                    ),
+                    AttributeLoc::Param(i),
+                ),
+            ]
+        };
+
         let sig_returns_bitwidths = sig
             .results()
             .iter()
@@ -67,14 +102,14 @@ impl Abi for X86_64SystemV {
                 intrinsics
                     .void_ty
                     .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                vec![],
+                vmctx_attributes(0),
             ),
             [_] => {
                 let single_value = sig.results()[0];
                 (
                     type_to_llvm(intrinsics, single_value)?
                         .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                    vec![],
+                    vmctx_attributes(0),
                 )
             }
             [32, 64] | [64, 32] | [64, 64] => {
@@ -88,7 +123,7 @@ impl Abi for X86_64SystemV {
                     context
                         .struct_type(&basic_types, false)
                         .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                    vec![],
+                    vmctx_attributes(0),
                 )
             }
             [32, 32] if sig.results()[0] == Type::F32 && sig.results()[1] == Type::F32 => (
@@ -96,13 +131,13 @@ impl Abi for X86_64SystemV {
                     .f32_ty
                     .vec_type(2)
                     .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                vec![],
+                vmctx_attributes(0),
             ),
             [32, 32] => (
                 intrinsics
                     .i64_ty
                     .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                vec![],
+                vmctx_attributes(0),
             ),
             [32, 32, _] if sig.results()[0] == Type::F32 && sig.results()[1] == Type::F32 => (
                 context
@@ -114,7 +149,7 @@ impl Abi for X86_64SystemV {
                         false,
                     )
                     .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                vec![],
+                vmctx_attributes(0),
             ),
             [32, 32, _] => (
                 context
@@ -126,7 +161,7 @@ impl Abi for X86_64SystemV {
                         false,
                     )
                     .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                vec![],
+                vmctx_attributes(0),
             ),
             [64, 32, 32] if sig.results()[1] == Type::F32 && sig.results()[2] == Type::F32 => (
                 context
@@ -138,7 +173,7 @@ impl Abi for X86_64SystemV {
                         false,
                     )
                     .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                vec![],
+                vmctx_attributes(0),
             ),
             [64, 32, 32] => (
                 context
@@ -150,7 +185,7 @@ impl Abi for X86_64SystemV {
                         false,
                     )
                     .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                vec![],
+                vmctx_attributes(0),
             ),
             [32, 32, 32, 32] => (
                 context
@@ -170,7 +205,7 @@ impl Abi for X86_64SystemV {
                         false,
                     )
                     .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                vec![],
+                vmctx_attributes(0),
             ),
             _ => {
                 let basic_types: Vec<_> = sig
@@ -185,14 +220,17 @@ impl Abi for X86_64SystemV {
 
                 let param_types = std::iter::once(Ok(sret.as_basic_type_enum())).chain(param_types);
 
+                let mut attributes = vec![(
+                    context.create_enum_attribute(Attribute::get_named_enum_kind_id("sret"), 0),
+                    AttributeLoc::Param(0),
+                )];
+                attributes.append(&mut vmctx_attributes(1));
+
                 (
                     intrinsics
                         .void_ty
                         .fn_type(&param_types.collect::<Result<Vec<_>, _>>()?, false),
-                    vec![(
+                    attributes,
-                        context.create_enum_attribute(Attribute::get_named_enum_kind_id("sret"), 0),
-                        AttributeLoc::Param(0),
-                    )],
                 )
             }
         })
@@ -447,17 +485,18 @@ impl Abi for X86_64SystemV {
             })
             .collect::<Result<Vec<i32>, _>>()?;
 
-        Ok(!matches!(func_sig_returns_bitwidths.as_slice(),
+        Ok(!matches!(
-            []
+            func_sig_returns_bitwidths.as_slice(),
-            | [_]
+            [] | [_]
-            | [32, 32]
+                | [32, 32]
-            | [32, 64]
+                | [32, 64]
-            | [64, 32]
+                | [64, 32]
-            | [64, 64]
+                | [64, 64]
-            | [32, 32, 32]
+                | [32, 32, 32]
-            | [32, 32, 64]
+                | [32, 32, 64]
-            | [64, 32, 32]
+                | [64, 32, 32]
-            | [32, 32, 32, 32]))
+                | [32, 32, 32, 32]
+        ))
     }
 
     fn pack_values_for_register_return<'ctx>(

lib/compiler-llvm/src/trampoline/wasm.rs

@@ -50,7 +50,9 @@ impl FuncTrampoline {
         module.set_data_layout(&target_machine.get_target_data().get_data_layout());
         let intrinsics = Intrinsics::declare(&module, &self.ctx);
 
-        let (callee_ty, callee_attrs) = self.abi.func_type_to_llvm(&self.ctx, &intrinsics, ty)?;
+        let (callee_ty, callee_attrs) =
+            self.abi
+                .func_type_to_llvm(&self.ctx, &intrinsics, None, ty)?;
         let trampoline_ty = intrinsics.void_ty.fn_type(
             &[
                 intrinsics.ctx_ptr_ty.as_basic_type_enum(), // vmctx ptr
@@ -181,7 +183,8 @@ impl FuncTrampoline {
         let intrinsics = Intrinsics::declare(&module, &self.ctx);
 
         let (trampoline_ty, trampoline_attrs) =
-            self.abi.func_type_to_llvm(&self.ctx, &intrinsics, ty)?;
+            self.abi
+                .func_type_to_llvm(&self.ctx, &intrinsics, None, ty)?;
         let trampoline_func = module.add_function(name, trampoline_ty, Some(Linkage::External));
         for (attr, attr_loc) in trampoline_attrs {
             trampoline_func.add_attribute(attr_loc, attr);

lib/compiler-llvm/src/translator/code.rs

@@ -34,7 +34,7 @@ use wasmer_types::{
     FunctionIndex, FunctionType, GlobalIndex, LocalFunctionIndex, MemoryIndex, SignatureIndex,
     TableIndex, Type,
 };
-use wasmer_vm::{MemoryStyle, ModuleInfo, TableStyle};
+use wasmer_vm::{MemoryStyle, ModuleInfo, TableStyle, VMOffsets};
 
 const FUNCTION_SECTION: &str = "__TEXT,wasmer_function";
 
@@ -101,19 +101,18 @@ impl FuncTranslator {
             .get(wasm_module.functions[func_index])
             .unwrap();
 
+        // TODO: pointer width
+        let offsets = VMOffsets::new(8, &wasm_module);
         let intrinsics = Intrinsics::declare(&module, &self.ctx);
         let (func_type, func_attrs) =
             self.abi
-                .func_type_to_llvm(&self.ctx, &intrinsics, wasm_fn_type)?;
+                .func_type_to_llvm(&self.ctx, &intrinsics, Some(&offsets), wasm_fn_type)?;
 
         let func = module.add_function(&function_name, func_type, Some(Linkage::External));
         for (attr, attr_loc) in &func_attrs {
             func.add_attribute(*attr_loc, *attr);
         }
 
-        // TODO: mark vmctx align 16
-        // TODO: figure out how many bytes long vmctx is, and mark it dereferenceable. (no need to mark it nonnull once we do this.)
-        // TODO: mark vmctx nofree
         func.add_attribute(AttributeLoc::Function, intrinsics.stack_probe);
         func.set_personality_function(intrinsics.personality);
         func.as_global_value().set_section(FUNCTION_SECTION);
@@ -2353,9 +2352,12 @@ impl<'ctx, 'a> LLVMFunctionCodeGenerator<'ctx, 'a> {
                 self.builder.build_unreachable();
                 self.builder.position_at_end(continue_block);
 
-                let (llvm_func_type, llvm_func_attrs) =
+                let (llvm_func_type, llvm_func_attrs) = self.abi.func_type_to_llvm(
-                    self.abi
+                    &self.context,
-                        .func_type_to_llvm(&self.context, &self.intrinsics, func_type)?;
+                    &self.intrinsics,
+                    Some(self.ctx.get_offsets()),
+                    func_type,
+                )?;
 
                 let params = self.state.popn_save_extra(func_type.params().len())?;
 

lib/compiler-llvm/src/translator/intrinsics.rs

@@ -934,13 +934,18 @@ impl<'ctx, 'a> CtxType<'ctx, 'a> {
         func_type: &FuncType,
         function_name: &str,
     ) -> Result<&FunctionCache<'ctx>, CompileError> {
-        let (cached_functions, ctx_ptr_value) = (&mut self.cached_functions, &self.ctx_ptr_value);
+        let (cached_functions, ctx_ptr_value, offsets) = (
+            &mut self.cached_functions,
+            &self.ctx_ptr_value,
+            &self.offsets,
+        );
         Ok(match cached_functions.entry(function_index) {
             Entry::Occupied(entry) => entry.into_mut(),
             Entry::Vacant(entry) => {
                 debug_assert!(module.get_function(function_name).is_none());
                 let (llvm_func_type, llvm_func_attrs) =
-                    self.abi.func_type_to_llvm(context, intrinsics, func_type)?;
+                    self.abi
+                        .func_type_to_llvm(context, intrinsics, Some(offsets), func_type)?;
                 let func =
                     module.add_function(function_name, llvm_func_type, Some(Linkage::External));
                 for (attr, attr_loc) in &llvm_func_attrs {
@@ -973,7 +978,8 @@ impl<'ctx, 'a> CtxType<'ctx, 'a> {
             Entry::Occupied(entry) => entry.into_mut(),
             Entry::Vacant(entry) => {
                 let (llvm_func_type, llvm_func_attrs) =
-                    self.abi.func_type_to_llvm(context, intrinsics, func_type)?;
+                    self.abi
+                        .func_type_to_llvm(context, intrinsics, Some(offsets), func_type)?;
                 debug_assert!(wasm_module.local_func_index(function_index).is_none());
                 let offset = offsets.vmctx_vmfunction_import(function_index);
                 let offset = intrinsics.i32_ty.const_int(offset.into(), false);
@@ -1097,6 +1103,10 @@ impl<'ctx, 'a> CtxType<'ctx, 'a> {
                 .into_pointer_value()
         })
     }
+
+    pub fn get_offsets(&self) -> &VMOffsets {
+        &self.offsets
+    }
 }
 
 // Given an instruction that operates on memory, mark the access as not aliasing

lib/compiler/src/translator/sections.rs

@@ -207,7 +207,7 @@ pub fn parse_memory_section(
                 environ.declare_memory(MemoryType {
                     minimum: Pages(limits.initial),
                     maximum: limits.maximum.map(Pages),
-                    shared: shared,
+                    shared,
                 })?;
             }
             WPMemoryType::M64 { .. } => unimplemented!("64bit memory not implemented yet"),

lib/derive/src/lib.rs

@@ -76,6 +76,7 @@ fn derive_struct_fields(data: &DataStruct) -> (TokenStream, TokenStream) {
         Fields::Unnamed(fields) => fields.unnamed.iter().cloned().collect(),
     };
     for (field_num, f) in fields.into_iter().enumerate() {
+        let field_idx = syn::Index::from(field_num);
         let name = f.ident.clone();
         let top_level_ty: &Type = &f.ty;
         touched_fields.push(name.clone());
@@ -177,7 +178,7 @@ fn derive_struct_fields(data: &DataStruct) -> (TokenStream, TokenStream) {
                                     f.span()=>
                                         match #access_expr {
                                             Ok(#local_var) => {
-                                                self.#field_num.initialize(#local_var);
+                                                self.#field_idx.initialize(#local_var);
                                             },
                                             Err(_) => (),
                                         }
@@ -186,7 +187,7 @@ fn derive_struct_fields(data: &DataStruct) -> (TokenStream, TokenStream) {
                                 quote_spanned! {
                                     f.span()=>
                                         let #local_var: #inner_type = #access_expr?;
-                                    self.#field_num.initialize(#local_var);
+                                    self.#field_idx.initialize(#local_var);
                                 }
                             }
                         } else {

lib/emscripten/src/lib.rs

@@ -1002,8 +1002,7 @@ pub fn generate_emscripten_env(
     // Compatibility with newer versions of Emscripten
     let mut to_insert: Vec<(String, _)> = vec![];
     for (k, v) in env_ns.iter() {
-        if k.starts_with('_') {
+        if let Some(k) = k.strip_prefix('_') {
-            let k = &k[1..];
             if !env_ns.contains(k) {
                 to_insert.push((k.to_string(), v.clone()));
             }

lib/engine/src/export.rs

@@ -24,10 +24,10 @@ pub enum Export {
 impl From<Export> for VMExport {
     fn from(other: Export) -> Self {
         match other {
-            Export::Function(ExportFunction { vm_function, .. }) => VMExport::Function(vm_function),
+            Export::Function(ExportFunction { vm_function, .. }) => Self::Function(vm_function),
-            Export::Memory(ExportMemory { vm_memory }) => VMExport::Memory(vm_memory),
+            Export::Memory(ExportMemory { vm_memory }) => Self::Memory(vm_memory),
-            Export::Table(ExportTable { vm_table }) => VMExport::Table(vm_table),
+            Export::Table(ExportTable { vm_table }) => Self::Table(vm_table),
-            Export::Global(ExportGlobal { vm_global }) => VMExport::Global(vm_global),
+            Export::Global(ExportGlobal { vm_global }) => Self::Global(vm_global),
         }
     }
 }
@@ -35,13 +35,13 @@ impl From<Export> for VMExport {
 impl From<VMExport> for Export {
     fn from(other: VMExport) -> Self {
         match other {
-            VMExport::Function(vm_function) => Export::Function(ExportFunction {
+            VMExport::Function(vm_function) => Self::Function(ExportFunction {
                 vm_function,
                 metadata: None,
             }),
-            VMExport::Memory(vm_memory) => Export::Memory(ExportMemory { vm_memory }),
+            VMExport::Memory(vm_memory) => Self::Memory(ExportMemory { vm_memory }),
-            VMExport::Table(vm_table) => Export::Table(ExportTable { vm_table }),
+            VMExport::Table(vm_table) => Self::Table(ExportTable { vm_table }),
-            VMExport::Global(vm_global) => Export::Global(ExportGlobal { vm_global }),
+            VMExport::Global(vm_global) => Self::Global(ExportGlobal { vm_global }),
         }
     }
 }

lib/engine/src/resolver.rs

@@ -183,7 +183,7 @@ pub fn resolve_imports(
                 let env = if let Some(ExportFunctionMetadata {
                     host_env_clone_fn: clone,
                     ..
-                }) = f.metadata.as_ref().map(|x| &**x)
+                }) = f.metadata.as_deref()
                 {
                     // TODO: maybe start adding asserts in all these
                     // unsafe blocks to prevent future changes from

lib/vm/src/instance/mod.rs

@@ -8,8 +8,10 @@
 //! wrapper around an `InstanceRef`.
 
 mod allocator;
+mod r#ref;
 
 pub use allocator::InstanceAllocator;
+pub use r#ref::InstanceRef;
 
 use crate::export::VMExport;
 use crate::global::Global;
@@ -27,7 +29,6 @@ use crate::{FunctionBodyPtr, ModuleInfo, VMOffsets};
 use crate::{VMExportFunction, VMExportGlobal, VMExportMemory, VMExportTable};
 use memoffset::offset_of;
 use more_asserts::assert_lt;
-use std::alloc::Layout;
 use std::any::Any;
 use std::cell::{Cell, RefCell};
 use std::collections::HashMap;
@@ -35,7 +36,7 @@ use std::convert::{TryFrom, TryInto};
 use std::ffi;
 use std::fmt;
 use std::ptr::NonNull;
-use std::sync::{atomic, Arc};
+use std::sync::Arc;
 use std::{mem, ptr, slice};
 use wasmer_types::entity::{packed_option::ReservedValue, BoxedSlice, EntityRef, PrimaryMap};
 use wasmer_types::{
@@ -173,7 +174,7 @@ impl Clone for ImportFunctionEnv {
 impl Drop for ImportFunctionEnv {
     fn drop(&mut self) {
         match self {
-            ImportFunctionEnv::Env {
+            Self::Env {
                 env, destructor, ..
             } => {
                 // # Safety
@@ -183,7 +184,7 @@ impl Drop for ImportFunctionEnv {
                     (destructor)(*env);
                 }
             }
-            ImportFunctionEnv::NoEnv => (),
+            Self::NoEnv => (),
         }
     }
 }
@@ -218,6 +219,11 @@ impl Instance {
         &*self.module
     }
 
+    /// Offsets in the `vmctx` region.
+    fn offsets(&self) -> &VMOffsets {
+        &self.offsets
+    }
+
     /// Return a pointer to the `VMSharedSignatureIndex`s.
     fn signature_ids_ptr(&self) -> *mut VMSharedSignatureIndex {
         unsafe { self.vmctx_plus_offset(self.offsets.vmctx_signature_ids_begin()) }
@@ -464,9 +470,7 @@ impl Instance {
             .memories
             .get(memory_index)
             .unwrap_or_else(|| panic!("no memory for index {}", memory_index.index()));
-        let result = mem.grow(delta.into());
+        mem.grow(delta.into())
-
-        result
     }
 
     /// Grow imported memory by the specified amount of pages.
@@ -767,212 +771,6 @@ impl Instance {
     }
 }
 
-/// An `InstanceRef` is responsible to properly deallocate,
-/// and to give access to an `Instance`, in such a way that `Instance`
-/// is unique, can be shared, safely, across threads, without
-/// duplicating the pointer in multiple locations. `InstanceRef`
-/// must be the only “owner” of an `Instance`.
-///
-/// Consequently, one must not share `Instance` but
-/// `InstanceRef`. It acts like an Atomically Reference Counter
-/// to `Instance`. In short, `InstanceRef` is roughly a
-/// simplified version of `std::sync::Arc`.
-///
-/// This `InstanceRef` must be freed with [`InstanceRef::deallocate_instance`]
-/// if and only if it has been set correctly. The `Drop` implementation of
-/// [`InstanceRef`] calls its `deallocate_instance` method without
-/// checking if this  property holds, only when `Self.strong` is equal to 1.
-///
-/// Note for the curious reader: [`InstanceAllocator::new`]
-/// and [`InstanceHandle::new`] will respectively allocate a proper
-/// `Instance` and will fill it correctly.
-///
-/// A little bit of background: The initial goal was to be able to
-/// share an [`Instance`] between an [`InstanceHandle`] and the module
-/// exports, so that one can drop a [`InstanceHandle`] but still being
-/// able to use the exports properly.
-///
-/// This structure has a C representation because `Instance` is
-/// dynamically-sized, and the `instance` field must be last.
-#[derive(Debug)]
-#[repr(C)]
-pub struct InstanceRef {
-    /// Number of `Self` in the nature. It increases when `Self` is
-    /// cloned, and it decreases when `Self` is dropped.
-    strong: Arc<atomic::AtomicUsize>,
-
-    /// The layout of `Instance` (which can vary).
-    instance_layout: Layout,
-
-    /// The `Instance` itself. It must be the last field of
-    /// `InstanceRef` since `Instance` is dyamically-sized.
-    ///
-    /// `Instance` must not be dropped manually by Rust, because it's
-    /// allocated manually with `alloc` and a specific layout (Rust
-    /// would be able to drop `Instance` itself but it will imply a
-    /// memory leak because of `alloc`).
-    ///
-    /// No one in the code has a copy of the `Instance`'s
-    /// pointer. `Self` is the only one.
-    instance: NonNull<Instance>,
-}
-
-impl InstanceRef {
-    /// Create a new `InstanceRef`. It allocates nothing. It fills
-    /// nothing. The `Instance` must be already valid and
-    /// filled.
-    ///
-    /// # Safety
-    ///
-    /// `instance` must a non-null, non-dangling, properly aligned,
-    /// and correctly initialized pointer to `Instance`. See
-    /// [`InstanceAllocator`] for an example of how to correctly use
-    /// this API.
-    pub(self) unsafe fn new(instance: NonNull<Instance>, instance_layout: Layout) -> Self {
-        Self {
-            strong: Arc::new(atomic::AtomicUsize::new(1)),
-            instance_layout,
-            instance,
-        }
-    }
-
-    /// A soft limit on the amount of references that may be made to an `InstanceRef`.
-    ///
-    /// Going above this limit will make the program to panic at exactly
-    /// `MAX_REFCOUNT` references.
-    const MAX_REFCOUNT: usize = std::usize::MAX - 1;
-
-    /// Deallocate `Instance`.
-    ///
-    /// # Safety
-    ///
-    /// `Self.instance` must be correctly set and filled before being
-    /// dropped and deallocated.
-    unsafe fn deallocate_instance(&mut self) {
-        let instance_ptr = self.instance.as_ptr();
-
-        ptr::drop_in_place(instance_ptr);
-        std::alloc::dealloc(instance_ptr as *mut u8, self.instance_layout);
-    }
-
-    /// Get the number of strong references pointing to this
-    /// `InstanceRef`.
-    pub fn strong_count(&self) -> usize {
-        self.strong.load(atomic::Ordering::SeqCst)
-    }
-
-    /// Get a reference to the `Instance`.
-    #[inline]
-    pub(crate) fn as_ref<'a>(&'a self) -> &'a Instance {
-        // SAFETY: The pointer is properly aligned, it is
-        // “dereferencable”, it points to an initialized memory of
-        // `Instance`, and the reference has the lifetime `'a`.
-        unsafe { self.instance.as_ref() }
-    }
-
-    #[inline]
-    unsafe fn as_mut<'a>(&'a mut self) -> &'a mut Instance {
-        self.instance.as_mut()
-    }
-}
-
-/// TODO: Review this super carefully.
-unsafe impl Send for InstanceRef {}
-unsafe impl Sync for InstanceRef {}
-
-impl Clone for InstanceRef {
-    /// Makes a clone of `InstanceRef`.
-    ///
-    /// This creates another `InstanceRef` using the same
-    /// `instance` pointer, increasing the strong reference count.
-    #[inline]
-    fn clone(&self) -> Self {
-        // Using a relaxed ordering is alright here, as knowledge of
-        // the original reference prevents other threads from
-        // erroneously deleting the object.
-        //
-        // As explained in the [Boost documentation][1]:
-        //
-        // > Increasing the reference counter can always be done with
-        // > `memory_order_relaxed`: New references to an object can
-        // > only be formed from an existing reference, and passing an
-        // > existing reference from one thread to another must already
-        // > provide any required synchronization.
-        //
-        // [1]: https://www.boost.org/doc/libs/1_55_0/doc/html/atomic/usage_examples.html
-        let old_size = self.strong.fetch_add(1, atomic::Ordering::Relaxed);
-
-        // However we need to guard against massive refcounts in case
-        // someone is `mem::forget`ing `InstanceRef`. If we
-        // don't do this the count can overflow and users will
-        // use-after free. We racily saturate to `isize::MAX` on the
-        // assumption that there aren't ~2 billion threads
-        // incrementing the reference count at once. This branch will
-        // never be taken in any realistic program.
-        //
-        // We abort because such a program is incredibly degenerate,
-        // and we don't care to support it.
-
-        if old_size > Self::MAX_REFCOUNT {
-            panic!("Too many references of `InstanceRef`");
-        }
-
-        Self {
-            strong: self.strong.clone(),
-            instance_layout: self.instance_layout,
-            instance: self.instance.clone(),
-        }
-    }
-}
-
-impl PartialEq for InstanceRef {
-    /// Two `InstanceRef` are equal if and only if
-    /// `Self.instance` points to the same location.
-    fn eq(&self, other: &Self) -> bool {
-        self.instance == other.instance
-    }
-}
-
-impl Drop for InstanceRef {
-    /// Drop the `InstanceRef`.
-    ///
-    /// This will decrement the strong reference count. If it reaches
-    /// 1, then the `Self.instance` will be deallocated with
-    /// `Self::deallocate_instance`.
-    fn drop(&mut self) {
-        // Because `fetch_sub` is already atomic, we do not need to
-        // synchronize with other thread.
-        if self.strong.fetch_sub(1, atomic::Ordering::Release) != 1 {
-            return;
-        }
-
-        // This fence is needed to prevent reordering of use of the data and
-        // deletion of the data. Because it is marked `Release`, the decreasing
-        // of the reference count synchronizes with this `Acquire` fence. This
-        // means that use of the data happens before decreasing the reference
-        // count, which happens before this fence, which happens before the
-        // deletion of the data.
-        //
-        // As explained in the [Boost documentation][1]:
-        //
-        // > It is important to enforce any possible access to the object in one
-        // > thread (through an existing reference) to *happen before* deleting
-        // > the object in a different thread. This is achieved by a "release"
-        // > operation after dropping a reference (any access to the object
-        // > through this reference must obviously happened before), and an
-        // > "acquire" operation before deleting the object.
-        //
-        // [1]: https://www.boost.org/doc/libs/1_55_0/doc/html/atomic/usage_examples.html
-        atomic::fence(atomic::Ordering::Acquire);
-
-        // Now we can deallocate the instance. Note that we don't
-        // check the pointer to `Instance` is correctly initialized,
-        // but the way `InstanceHandle` creates the
-        // `InstanceRef` ensures that.
-        unsafe { Self::deallocate_instance(self) };
-    }
-}
-
 /// A handle holding an `InstanceRef`, which holds an `Instance`
 /// of a WebAssembly module.
 ///
@@ -1141,6 +939,13 @@ impl InstanceHandle {
         self.instance().as_ref().vmctx_ptr()
     }
 
+    /// Return a reference to the `VMOffsets` to get offsets in the
+    /// `Self::vmctx_ptr` region. Be careful when doing pointer
+    /// arithmetic!
+    pub fn vmoffsets(&self) -> &VMOffsets {
+        self.instance().as_ref().offsets()
+    }
+
     /// Return a reference-counting pointer to a module.
     pub fn module(&self) -> &Arc<ModuleInfo> {
         self.instance().as_ref().module()

lib/vm/src/instance/ref.rs

@@ -0,0 +1,210 @@
+use super::Instance;
+use std::alloc::Layout;
+use std::ptr::{self, NonNull};
+use std::sync::{atomic, Arc};
+
+/// An `InstanceRef` is responsible to properly deallocate,
+/// and to give access to an `Instance`, in such a way that `Instance`
+/// is unique, can be shared, safely, across threads, without
+/// duplicating the pointer in multiple locations. `InstanceRef`
+/// must be the only “owner” of an `Instance`.
+///
+/// Consequently, one must not share `Instance` but
+/// `InstanceRef`. It acts like an Atomically Reference Counter
+/// to `Instance`. In short, `InstanceRef` is roughly a
+/// simplified version of `std::sync::Arc`.
+///
+/// This `InstanceRef` must be freed with [`InstanceRef::deallocate_instance`]
+/// if and only if it has been set correctly. The `Drop` implementation of
+/// [`InstanceRef`] calls its `deallocate_instance` method without
+/// checking if this  property holds, only when `Self.strong` is equal to 1.
+///
+/// Note for the curious reader: [`InstanceAllocator::new`]
+/// and [`InstanceHandle::new`] will respectively allocate a proper
+/// `Instance` and will fill it correctly.
+///
+/// A little bit of background: The initial goal was to be able to
+/// share an [`Instance`] between an [`InstanceHandle`] and the module
+/// exports, so that one can drop a [`InstanceHandle`] but still being
+/// able to use the exports properly.
+///
+/// This structure has a C representation because `Instance` is
+/// dynamically-sized, and the `instance` field must be last.
+#[derive(Debug)]
+#[repr(C)]
+pub struct InstanceRef {
+    /// Number of `Self` in the nature. It increases when `Self` is
+    /// cloned, and it decreases when `Self` is dropped.
+    strong: Arc<atomic::AtomicUsize>,
+
+    /// The layout of `Instance` (which can vary).
+    instance_layout: Layout,
+
+    /// The `Instance` itself. It must be the last field of
+    /// `InstanceRef` since `Instance` is dyamically-sized.
+    ///
+    /// `Instance` must not be dropped manually by Rust, because it's
+    /// allocated manually with `alloc` and a specific layout (Rust
+    /// would be able to drop `Instance` itself but it will imply a
+    /// memory leak because of `alloc`).
+    ///
+    /// No one in the code has a copy of the `Instance`'s
+    /// pointer. `Self` is the only one.
+    instance: NonNull<Instance>,
+}
+
+impl InstanceRef {
+    /// Create a new `InstanceRef`. It allocates nothing. It fills
+    /// nothing. The `Instance` must be already valid and
+    /// filled.
+    ///
+    /// # Safety
+    ///
+    /// `instance` must a non-null, non-dangling, properly aligned,
+    /// and correctly initialized pointer to `Instance`. See
+    /// [`InstanceAllocator`] for an example of how to correctly use
+    /// this API.
+    pub(super) unsafe fn new(instance: NonNull<Instance>, instance_layout: Layout) -> Self {
+        Self {
+            strong: Arc::new(atomic::AtomicUsize::new(1)),
+            instance_layout,
+            instance,
+        }
+    }
+
+    /// A soft limit on the amount of references that may be made to an `InstanceRef`.
+    ///
+    /// Going above this limit will make the program to panic at exactly
+    /// `MAX_REFCOUNT` references.
+    const MAX_REFCOUNT: usize = std::usize::MAX - 1;
+
+    /// Deallocate `Instance`.
+    ///
+    /// # Safety
+    ///
+    /// `Self.instance` must be correctly set and filled before being
+    /// dropped and deallocated.
+    unsafe fn deallocate_instance(&mut self) {
+        let instance_ptr = self.instance.as_ptr();
+
+        ptr::drop_in_place(instance_ptr);
+        std::alloc::dealloc(instance_ptr as *mut u8, self.instance_layout);
+    }
+
+    /// Get the number of strong references pointing to this
+    /// `InstanceRef`.
+    pub fn strong_count(&self) -> usize {
+        self.strong.load(atomic::Ordering::SeqCst)
+    }
+
+    /// Get a reference to the `Instance`.
+    #[inline]
+    pub(crate) fn as_ref(&self) -> &Instance {
+        // SAFETY: The pointer is properly aligned, it is
+        // “dereferencable”, it points to an initialized memory of
+        // `Instance`, and the reference has the lifetime `'a`.
+        unsafe { self.instance.as_ref() }
+    }
+
+    #[inline]
+    pub(super) unsafe fn as_mut(&mut self) -> &mut Instance {
+        self.instance.as_mut()
+    }
+}
+
+/// TODO: Review this super carefully.
+unsafe impl Send for InstanceRef {}
+unsafe impl Sync for InstanceRef {}
+
+impl Clone for InstanceRef {
+    /// Makes a clone of `InstanceRef`.
+    ///
+    /// This creates another `InstanceRef` using the same
+    /// `instance` pointer, increasing the strong reference count.
+    #[inline]
+    fn clone(&self) -> Self {
+        // Using a relaxed ordering is alright here, as knowledge of
+        // the original reference prevents other threads from
+        // erroneously deleting the object.
+        //
+        // As explained in the [Boost documentation][1]:
+        //
+        // > Increasing the reference counter can always be done with
+        // > `memory_order_relaxed`: New references to an object can
+        // > only be formed from an existing reference, and passing an
+        // > existing reference from one thread to another must already
+        // > provide any required synchronization.
+        //
+        // [1]: https://www.boost.org/doc/libs/1_55_0/doc/html/atomic/usage_examples.html
+        let old_size = self.strong.fetch_add(1, atomic::Ordering::Relaxed);
+
+        // However we need to guard against massive refcounts in case
+        // someone is `mem::forget`ing `InstanceRef`. If we
+        // don't do this the count can overflow and users will
+        // use-after free. We racily saturate to `isize::MAX` on the
+        // assumption that there aren't ~2 billion threads
+        // incrementing the reference count at once. This branch will
+        // never be taken in any realistic program.
+        //
+        // We abort because such a program is incredibly degenerate,
+        // and we don't care to support it.
+
+        if old_size > Self::MAX_REFCOUNT {
+            panic!("Too many references of `InstanceRef`");
+        }
+
+        Self {
+            strong: self.strong.clone(),
+            instance_layout: self.instance_layout,
+            instance: self.instance.clone(),
+        }
+    }
+}
+
+impl PartialEq for InstanceRef {
+    /// Two `InstanceRef` are equal if and only if
+    /// `Self.instance` points to the same location.
+    fn eq(&self, other: &Self) -> bool {
+        self.instance == other.instance
+    }
+}
+
+impl Drop for InstanceRef {
+    /// Drop the `InstanceRef`.
+    ///
+    /// This will decrement the strong reference count. If it reaches
+    /// 1, then the `Self.instance` will be deallocated with
+    /// `Self::deallocate_instance`.
+    fn drop(&mut self) {
+        // Because `fetch_sub` is already atomic, we do not need to
+        // synchronize with other thread.
+        if self.strong.fetch_sub(1, atomic::Ordering::Release) != 1 {
+            return;
+        }
+
+        // This fence is needed to prevent reordering of use of the data and
+        // deletion of the data. Because it is marked `Release`, the decreasing
+        // of the reference count synchronizes with this `Acquire` fence. This
+        // means that use of the data happens before decreasing the reference
+        // count, which happens before this fence, which happens before the
+        // deletion of the data.
+        //
+        // As explained in the [Boost documentation][1]:
+        //
+        // > It is important to enforce any possible access to the object in one
+        // > thread (through an existing reference) to *happen before* deleting
+        // > the object in a different thread. This is achieved by a "release"
+        // > operation after dropping a reference (any access to the object
+        // > through this reference must obviously happened before), and an
+        // > "acquire" operation before deleting the object.
+        //
+        // [1]: https://www.boost.org/doc/libs/1_55_0/doc/html/atomic/usage_examples.html
+        atomic::fence(atomic::Ordering::Acquire);
+
+        // Now we can deallocate the instance. Note that we don't
+        // check the pointer to `Instance` is correctly initialized,
+        // but the way `InstanceHandle` creates the
+        // `InstanceRef` ensures that.
+        unsafe { Self::deallocate_instance(self) };
+    }
+}

lib/vm/src/memory.rs

@@ -267,7 +267,7 @@ impl LinearMemory {
             needs_signal_handlers,
             vm_memory_definition: if let Some(mem_loc) = vm_memory_location {
                 {
-                    let mut ptr = mem_loc.clone();
+                    let mut ptr = mem_loc;
                     let md = ptr.as_mut();
                     md.base = base_ptr;
                     md.current_length = mem_length;
@@ -293,7 +293,7 @@ impl LinearMemory {
     ///   this function. You can get this by locking the `mmap` mutex.
     unsafe fn get_vm_memory_definition(&self) -> NonNull<VMMemoryDefinition> {
         match &self.vm_memory_definition {
-            VMMemoryDefinitionOwnership::VMOwned(ptr) => ptr.clone(),
+            VMMemoryDefinitionOwnership::VMOwned(ptr) => *ptr,
             VMMemoryDefinitionOwnership::HostOwned(boxed_ptr) => {
                 NonNull::new_unchecked(boxed_ptr.get())
             }

lib/vm/src/table.rs

@@ -187,7 +187,7 @@ impl LinearTable {
                 style: style.clone(),
                 vm_table_definition: if let Some(table_loc) = vm_table_location {
                     {
-                        let mut ptr = table_loc.clone();
+                        let mut ptr = table_loc;
                         let td = ptr.as_mut();
                         td.base = base as _;
                         td.current_elements = table_minimum as _;
@@ -212,7 +212,7 @@ impl LinearTable {
     ///   this function. You can get this by locking the `vec` mutex.
     unsafe fn get_vm_table_definition(&self) -> NonNull<VMTableDefinition> {
         match &self.vm_table_definition {
-            VMTableDefinitionOwnership::VMOwned(ptr) => ptr.clone(),
+            VMTableDefinitionOwnership::VMOwned(ptr) => *ptr,
             VMTableDefinitionOwnership::HostOwned(boxed_ptr) => {
                 NonNull::new_unchecked(boxed_ptr.get())
             }

lib/vm/src/trap/traphandlers.rs

@@ -221,7 +221,7 @@ cfg_if::cfg_if! {
                         pub __pc: u64,   /* Program counter */
                         pub __cpsr: u32,  /* Current program status register */
                         pub __pad: u32,   /* Same size for 32-bit or 64-bit clients */
-                    };
+                    }
 
                     let cx = &*(cx as *const libc::ucontext_t);
                     let uc_mcontext = mem::transmute::<_, *const __darwin_arm_thread_state64>(&(*cx.uc_mcontext).__ss);

lib/wasi/src/lib.rs

@@ -128,7 +128,7 @@ pub fn generate_import_object_from_env(
 // fail on Apple Silicon (with Cranelift).
 fn get_path_open_for_store(store: &Store, env: WasiEnv) -> Function {
     #[cfg(not(all(target_os = "macos", target_arch = "aarch64",)))]
-    let path_open = Function::new_native_with_env(store, env.clone(), path_open);
+    let path_open = Function::new_native_with_env(store, env, path_open);
     #[cfg(all(target_os = "macos", target_arch = "aarch64",))]
     let path_open = Function::new_with_env(
         store,

lib/wasi/src/state/builder.rs

@@ -349,7 +349,7 @@ impl WasiStateBuilder {
                 None => (),
             }
 
-            if env_value.iter().find(|&&ch| ch == 0).is_some() {
+            if env_value.iter().any(|&ch| ch == 0) {
                 return Err(WasiStateCreationError::EnvironmentVariableFormatError(
                     format!(
                         "found nul byte in env var value \"{}\" (key=value)",

lib/wasi/src/state/types.rs

@@ -1027,7 +1027,8 @@ impl WasiFile for Pipe {
         self.buffer.len() as u64
     }
     fn set_len(&mut self, len: u64) -> Result<(), WasiFsError> {
-        Ok(self.buffer.resize(len as usize, 0))
+        self.buffer.resize(len as usize, 0);
+        Ok(())
     }
     fn unlink(&mut self) -> Result<(), WasiFsError> {
         Ok(())

lib/wasmer-types/src/values.rs

@@ -224,10 +224,10 @@ impl<T> From<ExternRef> for Value<T> {
 //     }
 // }
 
-const NOT_I32: &'static str = "Value is not of Wasm type i32";
+const NOT_I32: &str = "Value is not of Wasm type i32";
-const NOT_I64: &'static str = "Value is not of Wasm type i64";
+const NOT_I64: &str = "Value is not of Wasm type i64";
-const NOT_F32: &'static str = "Value is not of Wasm type f32";
+const NOT_F32: &str = "Value is not of Wasm type f32";
-const NOT_F64: &'static str = "Value is not of Wasm type f64";
+const NOT_F64: &str = "Value is not of Wasm type f64";
 
 impl<T> TryFrom<Value<T>> for i32 {
     type Error = &'static str;