Merge branch 'feature/wasi-fs' into feature/wasi

.circleci/config.yml

@@ -1,20 +1,28 @@
+run_with_build_env_vars: &run_with_build_env_vars
+  environment:
+    LLVM_SYS_70_PREFIX: /home/circleci/project/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04/
+
+run_install_dependencies: &run_install_dependencies
+  run:
+    name: install dependencies
+    command: |
+      sudo apt-get install -y cmake
+      curl -O https://releases.llvm.org/7.0.0/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz
+      tar xf clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz
+
 version: 2
 jobs:
   # Job used for testing
   lint:
     docker:
       - image: circleci/rust:latest
+    <<: *run_with_build_env_vars
     steps:
       - checkout
       - restore_cache:
           keys:
             - v6-lint-{{ arch }}-{{ checksum "Cargo.lock" }}
-      - run:
+      - <<: *run_install_dependencies
-          name: Install dependencies
-          command: |
-            sudo apt-get install -y cmake
-            curl -O https://releases.llvm.org/7.0.0/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz
-            tar xf clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz
       - run:
           name: Install lint deps
           command: |
@@ -25,7 +33,6 @@ jobs:
       - run:
           name: Execute lints
           command: |
-            export LLVM_SYS_70_PREFIX="`pwd`/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04/"
             make lint
       - save_cache:
           paths:
@@ -33,37 +40,27 @@ jobs:
             - target/debug/.fingerprint
             - target/debug/build
             - target/debug/deps
-          key: v6-lint-{{ arch }}-{{ checksum "Cargo.lock" }}
+          key: v6-test-cargo-cache-linux-{{ arch }}-{{ checksum "Cargo.lock" }}
 
   test:
     docker:
       - image: circleci/rust:latest
+    <<: *run_with_build_env_vars
     steps:
       - checkout
       - restore_cache:
           keys:
             - v6-test-cargo-cache-linux-{{ arch }}-{{ checksum "Cargo.lock" }}
-      - run:
+      - <<: *run_install_dependencies
-          name: Install dependencies
-          command: |
-            sudo apt-get install -y cmake
-            curl -O https://releases.llvm.org/7.0.0/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz
-            tar xf clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz
       - run:
           name: Tests
-          command: |
+          command: make test
-            export LLVM_SYS_70_PREFIX="`pwd`/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04/"
-            make test
       - run:
           name: Emscripten Tests
-          command: |
+          command: make test-emscripten
-            export LLVM_SYS_70_PREFIX="`pwd`/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04/"
-            make test-emscripten
       - run:
           name: Integration Tests
-          command: |
+          command: make integration-tests
-            export LLVM_SYS_70_PREFIX="`pwd`/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04/"
-            make integration-tests
       - save_cache:
           paths:
             - /usr/local/cargo/registry

Cargo.toml

@@ -19,29 +19,32 @@ include = [
 ]
 
 [dependencies]
+errno = "0.2.4"
 structopt = "0.2.11"
 wabt = "0.7.2"
 hashbrown = "0.1.8"
 wasmer-clif-backend = { path = "lib/clif-backend" }
+wasmer-dynasm-backend = { path = "lib/dynasm-backend", optional = true }
 wasmer-runtime = { path = "lib/runtime" }
+wasmer-runtime-abi = { path = "lib/runtime-abi", optional = true }
 wasmer-runtime-core = { path = "lib/runtime-core" }
 wasmer-emscripten = { path = "lib/emscripten" }
 wasmer-llvm-backend = { path = "lib/llvm-backend", optional = true }
-wasmer-dynasm-backend = { path = "lib/dynasm-backend", optional = true }
 wasmer-wasi = { path = "lib/wasi", optional = true }
 
 [workspace]
-members = ["lib/clif-backend", "lib/dynasm-backend", "lib/runtime", "lib/runtime-core", "lib/emscripten", "lib/spectests", "lib/win-exception-handler", "lib/runtime-c-api", "lib/llvm-backend", "lib/wasi"]
+members = ["lib/clif-backend", "lib/dynasm-backend", "lib/runtime", "lib/runtime-abi", "lib/runtime-core", "lib/emscripten", "lib/spectests", "lib/win-exception-handler", "lib/runtime-c-api", "lib/llvm-backend", "lib/wasi"]
 
 [build-dependencies]
 wabt = "0.7.2"
 glob = "0.2.11"
 
 [features]
-debug = ["wasmer-clif-backend/debug", "wasmer-runtime-core/debug"]
 default = ["fast-tests"]
+debug = ["wasmer-clif-backend/debug", "wasmer-runtime-core/debug"]
 # This feature will allow cargo test to run much faster
 fast-tests = []
 llvm = ["wasmer-llvm-backend"]
 dynasm = ["wasmer-dynasm-backend"]
-wasi = ["wasmer-wasi"]
+wasi = ["wasmer-wasi"]
+vfs = ["wasmer-runtime-abi"]

lib/clif-backend/Cargo.toml

@@ -8,7 +8,7 @@ repository = "https://github.com/wasmerio/wasmer"
 edition = "2018"
 
 [dependencies]
-wasmer-runtime-core = { path = "../runtime-core", version = "0.2.0" }
+wasmer-runtime-core = { path = "../runtime-core", version = "0.2.1" }
 cranelift-native = "0.26.0"
 cranelift-codegen = "0.26.0"
 cranelift-entity = "0.26.0"

lib/clif-backend/README.md

@@ -0,0 +1,31 @@
+<p align="center">
+  <a href="https://wasmer.io" target="_blank" rel="noopener noreferrer">
+    <img width="400" src="https://raw.githubusercontent.com/wasmerio/wasmer/master/logo.png" alt="Wasmer logo">
+  </a>
+</p>
+
+<p align="center">
+  <a href="https://circleci.com/gh/wasmerio/wasmer/">
+    <img src="https://img.shields.io/circleci/project/github/wasmerio/wasmer/master.svg" alt="Build Status">
+  </a>
+  <a href="https://github.com/wasmerio/wasmer/blob/master/LICENSE">
+    <img src="https://img.shields.io/github/license/wasmerio/wasmer.svg" alt="License">
+  </a>
+  <a href="https://spectrum.chat/wasmer">
+    <img src="https://withspectrum.github.io/badge/badge.svg" alt="Join the Wasmer Community">
+  </a>
+  <a href="https://crates.io/crates/wasmer-clif-backend">
+    <img src="https://img.shields.io/crates/d/wasmer-clif-backend.svg" alt="Number of downloads from crates.io">
+  </a>
+  <a href="https://docs.rs/wasmer-clif-backend">
+    <img src="https://docs.rs/wasmer-clif-backend/badge.svg" alt="Read our API documentation">
+  </a>
+</p>
+
+# Wasmer Cranelift backend
+
+Wasmer is a standalone JIT WebAssembly runtime, aiming to be fully
+compatible with Emscripten, Rust and Go. [Learn
+more](https://github.com/wasmerio/wasmer).
+
+This crate represents the Cranelift backend.

lib/clif-backend/src/module.rs

@@ -51,6 +51,8 @@ impl Module {
                 namespace_table: StringTable::new(),
                 name_table: StringTable::new(),
                 em_symbol_map: compiler_config.symbol_map.clone(),
+
+                custom_sections: HashMap::new(),
             },
         }
     }

lib/dynasm-backend/Cargo.toml

@@ -16,3 +16,4 @@ lazy_static = "1.2.0"
 byteorder = "1"
 nix = "0.13.0"
 libc = "0.2.49"
+hashbrown = "0.1"

lib/dynasm-backend/README.md

@@ -0,0 +1,31 @@
+<p align="center">
+  <a href="https://wasmer.io" target="_blank" rel="noopener noreferrer">
+    <img width="400" src="https://raw.githubusercontent.com/wasmerio/wasmer/master/logo.png" alt="Wasmer logo">
+  </a>
+</p>
+
+<p align="center">
+  <a href="https://circleci.com/gh/wasmerio/wasmer/">
+    <img src="https://img.shields.io/circleci/project/github/wasmerio/wasmer/master.svg" alt="Build Status">
+  </a>
+  <a href="https://github.com/wasmerio/wasmer/blob/master/LICENSE">
+    <img src="https://img.shields.io/github/license/wasmerio/wasmer.svg" alt="License">
+  </a>
+  <a href="https://spectrum.chat/wasmer">
+    <img src="https://withspectrum.github.io/badge/badge.svg" alt="Join the Wasmer Community">
+  </a>
+  <a href="https://crates.io/crates/wasmer-dynasm-backend">
+    <img src="https://img.shields.io/crates/d/wasmer-dynasm-backend.svg" alt="Number of downloads from crates.io">
+  </a>
+  <a href="https://docs.rs/wasmer-dynasm-backend">
+    <img src="https://docs.rs/wasmer-dynasm-backend/badge.svg" alt="Read our API documentation">
+  </a>
+</p>
+
+# Wasmer dynasm backend
+
+Wasmer is a standalone JIT WebAssembly runtime, aiming to be fully
+compatible with Emscripten, Rust and Go. [Learn
+more](https://github.com/wasmerio/wasmer).
+
+This crate represents the dynasm backend.

lib/dynasm-backend/src/parse.rs

@@ -1,4 +1,5 @@
 use crate::codegen::{CodegenError, FunctionCodeGenerator, ModuleCodeGenerator};
+use hashbrown::HashMap;
 use wasmer_runtime_core::{
     backend::{Backend, CompilerConfig, FuncResolver, ProtectedCaller},
     module::{
@@ -98,6 +99,8 @@ pub fn read_module<
         name_table: StringTable::new(),
 
         em_symbol_map: compiler_config.symbol_map.clone(),
+
+        custom_sections: HashMap::new(),
     };
 
     let mut reader = ModuleReader::new(wasm)?;

lib/emscripten/emtests/test_vfs.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main() {
+    char data[256] = {0};
+    ssize_t fd = open("data.txt", 0);
+    ssize_t result = read((int)fd, &data, 255);
+    printf("content: %s", data);
+    printf("fd: %zd\n", fd);
+    return 0;
+}

lib/emscripten/emtests/test_vfs.md

@@ -0,0 +1,6 @@
+The wasm file `test_vfs.wasm` is generated by compiling the `test_vfs.c` and writing a tar.zst blob with a single file 
+named `data.txt`. 
+
+The program expects to find a file named `data.txt` and reads the contents and the file descriptor. 
+
+The runtime should mount the virtual filesystem and expose the file. 

lib/emscripten/emtests/test_vfs.out

@@ -0,0 +1 @@
+content: wasmer is awesomer

lib/emscripten/emtests/test_vfs_data.txt

@@ -0,0 +1 @@
+wasmer is awesomer

lib/emscripten/tests/emtests/test_vfs.rs

@@ -0,0 +1,8 @@
+use crate::emtests::_common::assert_emscripten_output;
+
+#[test]
+fn test_vfs() {
+    let wasm_bytes = include_bytes!("../../emtests/test_vfs_bundle.wasm");
+    let expected_str = include_str!("../../emtests/test_vfs.out");
+    assert_emscripten_output(wasm_bytes, expected_str);
+}

lib/llvm-backend/README.md

@@ -0,0 +1,31 @@
+<p align="center">
+  <a href="https://wasmer.io" target="_blank" rel="noopener noreferrer">
+    <img width="400" src="https://raw.githubusercontent.com/wasmerio/wasmer/master/logo.png" alt="Wasmer logo">
+  </a>
+</p>
+
+<p align="center">
+  <a href="https://circleci.com/gh/wasmerio/wasmer/">
+    <img src="https://img.shields.io/circleci/project/github/wasmerio/wasmer/master.svg" alt="Build Status">
+  </a>
+  <a href="https://github.com/wasmerio/wasmer/blob/master/LICENSE">
+    <img src="https://img.shields.io/github/license/wasmerio/wasmer.svg" alt="License">
+  </a>
+  <a href="https://spectrum.chat/wasmer">
+    <img src="https://withspectrum.github.io/badge/badge.svg" alt="Join the Wasmer Community">
+  </a>
+  <a href="https://crates.io/crates/wasmer-llvm-backend">
+    <img src="https://img.shields.io/crates/d/wasmer-llvm-backend.svg" alt="Number of downloads from crates.io">
+  </a>
+  <a href="https://docs.rs/wasmer-llvm-backend">
+    <img src="https://docs.rs/wasmer-llvm-backend/badge.svg" alt="Read our API documentation">
+  </a>
+</p>
+
+# Wasmer LLVM backend
+
+Wasmer is a standalone JIT WebAssembly runtime, aiming to be fully
+compatible with Emscripten, Rust and Go. [Learn
+more](https://github.com/wasmerio/wasmer).
+
+This crate represents the LLVM backend.

lib/llvm-backend/src/read_info.rs

@@ -18,6 +18,8 @@ use wasmparser::{
     SectionCode, Type as WpType,
 };
 
+use hashbrown::HashMap;
+
 pub fn read_module(
     wasm: &[u8],
     compiler_config: CompilerConfig,
@@ -47,6 +49,8 @@ pub fn read_module(
         name_table: StringTable::new(),
 
         em_symbol_map: compiler_config.symbol_map.clone(),
+
+        custom_sections: HashMap::new(),
     };
 
     let mut reader = ModuleReader::new(wasm)?;

lib/runtime-abi/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "wasmer-runtime-abi"
+version = "0.2.1"
+description = "Wasmer runtime core library"
+license = "MIT"
+authors = ["The Wasmer Engineering Team <engineering@wasmer.io>"]
+repository = "https://github.com/wasmerio/wasmer"
+edition = "2018"
+
+[dependencies]
+libc = "0.2.50"
+wasmer-runtime-core = { path = "../runtime-core" }
+hashbrown = "0.1"
+failure = "0.1"
+tar = "0.4"
+wasmparser = "0.23.0"
+zstd = "0.4"
+
+[target.'cfg(unix)'.dependencies.zbox]
+git = "https://github.com/wasmerio/zbox"
+branch = "bundle-libsodium"
+features = ["libsodium-bundled"]
+
+[dev-dependencies]
+tempdir = "0.3"
+
+[features]
+debug = []

lib/runtime-abi/README.md

@@ -0,0 +1,23 @@
+# runtime-abi
+
+This crate has ABI functions (like syscalls) and extensions to the runtime for enabling ABIs (e.g. virtual filesystem).
+
+## Virtual Filesystem (experimental)
+
+The virtual filesystem allows the runtime to read bundled wasm data as if they were files. Data that is stored in a 
+custom section compressed with [zstd][1] compression and archived with [tar][2] will be exposed as files and mounted
+in the `/` root.
+
+The only current supported operation is the `read` syscall. 
+
+The virtual filesystem is not enabled by default. Build with `--features vfs` to use it. 
+
+[Zbox][3] is a virtual filesystem that depends on [libsodium][4]. See [installation instructions][5] for libsodium here. One can
+statically link libsodium with the [instructions][6] on Zbox's readme. 
+
+[1]: https://facebook.github.io/zstd/
+[2]: https://www.gnu.org/software/tar/
+[3]: https://zbox.io/
+[4]: https://download.libsodium.org/doc/
+[5]: https://download.libsodium.org/doc/installation
+[6]: https://github.com/zboxfs/zbox#static-linking-with-libsodium

lib/runtime-abi/src/lib.rs

@@ -0,0 +1,6 @@
+#[cfg(not(target_os = "windows"))]
+#[macro_use]
+extern crate failure;
+
+#[cfg(not(target_os = "windows"))]
+pub mod vfs;

lib/runtime-abi/src/vfs/device_file.rs

@@ -0,0 +1,111 @@
+use crate::vfs::file_like::{FileLike, Metadata};
+use failure::Error;
+use std::io;
+
+pub struct Stdin;
+pub struct Stdout;
+pub struct Stderr;
+
+impl FileLike for Stdin {
+    fn metadata(&self) -> Result<Metadata, Error> {
+        unimplemented!()
+    }
+
+    fn set_file_len(&mut self, _len: usize) -> Result<(), failure::Error> {
+        panic!("Cannot set length of stdin");
+    }
+}
+
+impl io::Read for Stdin {
+    fn read(&mut self, _buf: &mut [u8]) -> Result<usize, io::Error> {
+        unimplemented!()
+    }
+}
+
+impl io::Write for Stdin {
+    fn write(&mut self, _buf: &[u8]) -> Result<usize, io::Error> {
+        unimplemented!()
+    }
+
+    fn flush(&mut self) -> Result<(), io::Error> {
+        unimplemented!()
+    }
+}
+
+impl io::Seek for Stdin {
+    fn seek(&mut self, _pos: io::SeekFrom) -> Result<u64, io::Error> {
+        unimplemented!()
+    }
+}
+
+impl FileLike for Stdout {
+    fn metadata(&self) -> Result<Metadata, failure::Error> {
+        unimplemented!()
+    }
+
+    fn set_file_len(&mut self, _len: usize) -> Result<(), failure::Error> {
+        panic!("Cannot set length of stdout");
+    }
+}
+
+impl io::Read for Stdout {
+    fn read(&mut self, _buf: &mut [u8]) -> Result<usize, io::Error> {
+        unimplemented!()
+    }
+}
+
+impl io::Write for Stdout {
+    fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
+        let stdout = io::stdout();
+        let mut handle = stdout.lock();
+        handle.write(buf)
+    }
+
+    fn flush(&mut self) -> Result<(), io::Error> {
+        let stdout = io::stdout();
+        let mut handle = stdout.lock();
+        handle.flush()
+    }
+}
+
+impl io::Seek for Stdout {
+    fn seek(&mut self, _pos: io::SeekFrom) -> Result<u64, io::Error> {
+        unimplemented!()
+    }
+}
+
+impl FileLike for Stderr {
+    fn metadata(&self) -> Result<Metadata, failure::Error> {
+        unimplemented!()
+    }
+
+    fn set_file_len(&mut self, _len: usize) -> Result<(), failure::Error> {
+        panic!("Cannot set length of stderr");
+    }
+}
+
+impl io::Read for Stderr {
+    fn read(&mut self, _buf: &mut [u8]) -> Result<usize, io::Error> {
+        unimplemented!()
+    }
+}
+
+impl io::Write for Stderr {
+    fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
+        let stderr = io::stderr();
+        let mut handle = stderr.lock();
+        handle.write(buf)
+    }
+
+    fn flush(&mut self) -> Result<(), io::Error> {
+        let stderr = io::stderr();
+        let mut handle = stderr.lock();
+        handle.flush()
+    }
+}
+
+impl io::Seek for Stderr {
+    fn seek(&mut self, _pos: io::SeekFrom) -> Result<u64, io::Error> {
+        unimplemented!()
+    }
+}

lib/runtime-abi/src/vfs/file_like.rs

@@ -0,0 +1,21 @@
+pub type Fd = isize;
+
+#[derive(Debug)]
+pub struct Metadata {
+    pub len: usize,
+    pub is_file: bool,
+}
+
+pub trait FileLike: std::io::Write + std::io::Read + std::io::Seek {
+    // get metadata
+    fn metadata(&self) -> Result<Metadata, failure::Error>;
+
+    // write
+    //    fn write_file(&mut self, buf: &[u8]) -> Result<usize, io::Error>;
+
+    // read
+    //    fn read_file(&mut self, buf: &mut [u8]) -> Result<usize, io::Error>;
+
+    // set_file_len
+    fn set_file_len(&mut self, len: usize) -> Result<(), failure::Error>;
+}

lib/runtime-abi/src/vfs/mod.rs

@@ -0,0 +1,5 @@
+pub mod device_file;
+pub mod file_like;
+pub mod vfs;
+pub mod vfs_header;
+pub mod virtual_file;

lib/runtime-abi/src/vfs/vfs.rs

@@ -0,0 +1,170 @@
+use crate::vfs::file_like::FileLike;
+use crate::vfs::vfs_header::{header_from_bytes, ArchiveType, CompressionType};
+use crate::vfs::virtual_file::VirtualFile;
+use hashbrown::HashMap;
+use std::cell::RefCell;
+use std::io;
+use std::io::Read;
+use std::path::{Path, PathBuf};
+use std::rc::Rc;
+use tar::EntryType;
+use zbox::{init_env, OpenOptions, Repo, RepoOpener};
+
+pub struct Vfs {
+    repo: Repo,
+    device_files: HashMap<PathBuf, Rc<RefCell<dyn FileLike>>>,
+}
+
+impl Vfs {
+    /// Like `VfsBacking::from_tar_bytes` except it also decompresses from the zstd format.
+    pub fn from_tar_zstd_bytes<Reader: Read>(tar_bytes: Reader) -> Result<Self, failure::Error> {
+        let result = zstd::decode_all(tar_bytes);
+        let decompressed_data = result.unwrap();
+        Self::from_tar_bytes(&decompressed_data[..])
+    }
+
+    /// Match on the type of the compressed-archive and select the correct unpack method
+    pub fn from_compressed_bytes(compressed_data_slice: &[u8]) -> Result<Self, failure::Error> {
+        let data_bytes = &compressed_data_slice[4..];
+        match header_from_bytes(compressed_data_slice)? {
+            (_, CompressionType::ZSTD, ArchiveType::TAR) => Self::from_tar_zstd_bytes(data_bytes),
+            (_, CompressionType::NONE, ArchiveType::TAR) => Self::from_tar_bytes(data_bytes),
+        }
+    }
+
+    /// Create a vfs from raw bytes in tar format
+    pub fn from_tar_bytes<Reader: Read>(tar_bytes: Reader) -> Result<Self, failure::Error> {
+        init_env();
+        let mut repo = RepoOpener::new()
+            .create(true)
+            .open("mem://wasmer_fs", "")
+            .unwrap();
+        let _errors = tar::Archive::new(tar_bytes)
+            .entries()?
+            .map(|entry| {
+                let mut entry: tar::Entry<Reader> = entry?;
+                let path = entry.path()?;
+                let path = convert_to_absolute_path(path);
+                let _result = match (entry.header().entry_type(), path.parent()) {
+                    (EntryType::Regular, Some(parent)) => {
+                        if let Err(e) = repo.create_dir_all(parent) {
+                            if e == zbox::Error::AlreadyExists || e == zbox::Error::IsRoot {
+                            } else {
+                                return Err(VfsAggregateError::ZboxError(e));
+                            }
+                        } else {
+                        }
+                        let mut file = repo.create_file(&path)?;
+                        if entry.header().size().unwrap_or(0) > 0 {
+                            io::copy(&mut entry, &mut file)?;
+                            file.finish()?;
+                        }
+                    }
+                    (EntryType::Directory, _) => {
+                        if let Err(e) = repo.create_dir_all(path) {
+                            if e == zbox::Error::AlreadyExists || e == zbox::Error::IsRoot {
+                            } else {
+                                return Err(VfsAggregateError::ZboxError(e));
+                            }
+                        } else {
+                        }
+                    }
+                    _ => return Err(VfsAggregateError::UnsupportedFileType),
+                };
+                Ok(())
+            })
+            .collect::<Vec<Result<(), VfsAggregateError>>>();
+
+        //        let import_errors = errors.iter().filter_map(|e| e.err()).collect::<Vec<_>>();
+
+        let vfs = Self {
+            repo,
+            device_files: HashMap::new(),
+            //            import_errors: vec![],
+        };
+        Ok(vfs)
+    }
+
+    pub fn new() -> Result<(Self, Vec<VfsError>), failure::Error> {
+        init_env();
+        let repo = RepoOpener::new()
+            .create(true)
+            .open("mem://wasmer_fs", "")
+            .unwrap();
+        Ok((
+            Vfs {
+                repo,
+                device_files: HashMap::new(),
+            },
+            vec![],
+        ))
+    }
+
+    pub fn open_file<P: AsRef<Path>>(&mut self, path: P) -> Option<Rc<RefCell<dyn FileLike>>> {
+        init_env();
+        let path = convert_to_absolute_path(path);
+        if let Ok(file) = OpenOptions::new().write(true).open(&mut self.repo, &path) {
+            Some(Rc::new(RefCell::new(VirtualFile::new(file))))
+        } else if let Some(dev_file) = self.device_files.get(&path) {
+            Some(dev_file.clone())
+        } else {
+            None
+        }
+    }
+
+    pub fn make_dir<P: AsRef<Path>>(&mut self, path: P) {
+        self.repo.create_dir_all(path).unwrap();
+    }
+
+    pub fn create_device_file<P: AsRef<Path>>(&mut self, path: P, file: Rc<RefCell<dyn FileLike>>) {
+        self.device_files.insert(path.as_ref().to_path_buf(), file);
+    }
+}
+
+fn convert_to_absolute_path<P: AsRef<Path>>(path: P) -> PathBuf {
+    let path = path.as_ref();
+    if path.is_relative() {
+        std::path::PathBuf::from("/").join(path)
+    } else {
+        path.to_path_buf()
+    }
+}
+
+pub type Handle = i32;
+#[derive(Debug, Fail)]
+pub enum VfsError {
+    #[fail(display = "File with file descriptor \"{}\" does not exist.", _0)]
+    FileWithFileDescriptorNotExist(Handle),
+    #[fail(display = "File descriptor does not exist.")]
+    FileDescriptorNotExist(Handle),
+    #[fail(display = "Source file descriptor does not exist.")]
+    SourceFileDescriptorDoesNotExist,
+    #[fail(display = "Target file descriptor already exists.")]
+    TargetFileDescriptorAlreadyExists,
+    #[fail(display = "Could not get a mutable reference to the file because it is in use.")]
+    CouldNotGetMutableReferenceToFile,
+}
+
+#[derive(Debug, Fail)]
+pub enum VfsAggregateError {
+    #[fail(display = "Entry error.")]
+    EntryError(std::io::Error),
+    #[fail(display = "IO error.")]
+    IoError(std::io::Error),
+    #[fail(display = "Zbox error.")]
+    ZboxError(zbox::Error),
+    #[fail(display = "Unsupported file type.")]
+    UnsupportedFileType,
+}
+
+impl std::convert::From<std::io::Error> for VfsAggregateError {
+    fn from(error: std::io::Error) -> VfsAggregateError {
+        VfsAggregateError::EntryError(error)
+    }
+}
+
+impl std::convert::From<zbox::Error> for VfsAggregateError {
+    fn from(error: zbox::Error) -> VfsAggregateError {
+        VfsAggregateError::ZboxError(error)
+    }
+}

lib/runtime-abi/src/vfs/vfs_header.rs

@@ -0,0 +1,57 @@
+/// Represents the version of this header schema.
+#[repr(u8)]
+#[derive(Debug, PartialEq)]
+pub enum HeaderVersion {
+    Version1 = 1,
+}
+
+/// Represents the compression type of the file data. Only Zstd or no-compression is supported.
+#[repr(u8)]
+#[derive(Debug, PartialEq)]
+pub enum CompressionType {
+    NONE = 0,
+    ZSTD = 1,
+}
+
+/// Represents the type of archive. The only supported archive is the Tar format.
+#[repr(u8)]
+#[derive(Debug, PartialEq)]
+pub enum ArchiveType {
+    TAR = 0,
+}
+
+// extract the header data from bytes
+pub fn header_from_bytes(
+    bytes: &[u8],
+) -> Result<(HeaderVersion, CompressionType, ArchiveType), HeaderError> {
+    if let Some(bytes) = bytes.get(..4) {
+        let version = match bytes[0] {
+            1 => HeaderVersion::Version1,
+            x => return Err(HeaderError::UnknownHeaderVersion(x)),
+        };
+        let compression_type = match bytes[1] {
+            0 => CompressionType::NONE,
+            1 => CompressionType::ZSTD,
+            x => return Err(HeaderError::UnknownCompressionType(x)),
+        };
+        let archive_type = match bytes[2] {
+            0 => ArchiveType::TAR,
+            x => return Err(HeaderError::UnknownArchiveType(x)),
+        };
+        Ok((version, compression_type, archive_type))
+    } else {
+        Err(HeaderError::HeaderTooSmall)
+    }
+}
+
+#[derive(Debug, Fail)]
+pub enum HeaderError {
+    #[fail(display = "The version is not supported: \"{}\"", _0)]
+    UnknownHeaderVersion(u8),
+    #[fail(display = "The compression type is unknown: \"{}\"", _0)]
+    UnknownCompressionType(u8),
+    #[fail(display = "The archive type is unknown: \"{}\"", _0)]
+    UnknownArchiveType(u8),
+    #[fail(display = "The header is too small.")]
+    HeaderTooSmall,
+}

lib/runtime-abi/src/vfs/virtual_file.rs

@@ -0,0 +1,51 @@
+use crate::vfs::file_like::{FileLike, Metadata};
+use failure::Error;
+use std::io;
+
+pub struct VirtualFile(zbox::File);
+
+impl VirtualFile {
+    pub fn new(file: zbox::File) -> Self {
+        VirtualFile(file)
+    }
+}
+
+impl FileLike for VirtualFile {
+    fn metadata(&self) -> Result<Metadata, Error> {
+        self.0
+            .metadata()
+            .map(|m| Metadata {
+                len: m.content_len(),
+                is_file: m.is_file(),
+            })
+            .map_err(|e: zbox::Error| e.into())
+    }
+
+    fn set_file_len(&mut self, len: usize) -> Result<(), failure::Error> {
+        self.0.set_len(len).map_err(|e| e.into())
+    }
+}
+
+impl io::Write for VirtualFile {
+    fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
+        let result = self.0.write(buf)?;
+        self.0.finish().unwrap();
+        Ok(result)
+    }
+
+    fn flush(&mut self) -> Result<(), io::Error> {
+        self.0.flush()
+    }
+}
+
+impl io::Read for VirtualFile {
+    fn read(&mut self, buf: &mut [u8]) -> Result<usize, io::Error> {
+        self.0.read(buf)
+    }
+}
+
+impl io::Seek for VirtualFile {
+    fn seek(&mut self, pos: io::SeekFrom) -> Result<u64, io::Error> {
+        self.0.seek(pos)
+    }
+}

lib/runtime-c-api/src/error.rs

@@ -0,0 +1,102 @@
+//! Errors.
+
+use libc::{c_char, c_int};
+use std::cell::RefCell;
+use std::error::Error;
+use std::fmt::{self, Display, Formatter};
+use std::ptr;
+use std::slice;
+
+thread_local! {
+    static LAST_ERROR: RefCell<Option<Box<Error>>> = RefCell::new(None);
+}
+
+pub(crate) fn update_last_error<E: Error + 'static>(err: E) {
+    LAST_ERROR.with(|prev| {
+        *prev.borrow_mut() = Some(Box::new(err));
+    });
+}
+
+/// Retrieve the most recent error, clearing it in the process.
+pub(crate) fn take_last_error() -> Option<Box<Error>> {
+    LAST_ERROR.with(|prev| prev.borrow_mut().take())
+}
+
+/// Gets the length in bytes of the last error.
+/// This can be used to dynamically allocate a buffer with the correct number of
+/// bytes needed to store a message.
+///
+/// # Example
+///
+/// ```c
+/// int error_len = wasmer_last_error_length();
+/// char *error_str = malloc(error_len);
+/// ```
+#[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,
+        None => 0,
+    })
+}
+
+/// Stores the last error message into the provided buffer up to the given `length`.
+/// The `length` parameter must be large enough to store the last error message.
+///
+/// Returns the length of the string in bytes.
+/// Returns `-1` if an error occurs.
+///
+/// # Example
+///
+/// ```c
+/// int error_len = wasmer_last_error_length();
+/// char *error_str = malloc(error_len);
+/// wasmer_last_error_message(error_str, error_len);
+/// printf("Error str: `%s`\n", error_str);
+/// ```
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_last_error_message(buffer: *mut c_char, length: c_int) -> c_int {
+    if buffer.is_null() {
+        // buffer pointer is null
+        return -1;
+    }
+
+    let last_error = match take_last_error() {
+        Some(err) => err,
+        None => return 0,
+    };
+
+    let error_message = last_error.to_string();
+
+    let buffer = slice::from_raw_parts_mut(buffer as *mut u8, length as usize);
+
+    if error_message.len() >= buffer.len() {
+        // buffer to small for err  message
+        return -1;
+    }
+
+    ptr::copy_nonoverlapping(
+        error_message.as_ptr(),
+        buffer.as_mut_ptr(),
+        error_message.len(),
+    );
+
+    // Add a trailing null so people using the string as a `char *` don't
+    // accidentally read into garbage.
+    buffer[error_message.len()] = 0;
+
+    error_message.len() as c_int
+}
+
+#[derive(Debug)]
+pub(crate) struct CApiError {
+    pub(crate) msg: String,
+}
+
+impl Display for CApiError {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        write!(f, "{}", &self.msg)
+    }
+}
+
+impl Error for CApiError {}

lib/runtime-c-api/src/export.rs

@@ -0,0 +1,440 @@
+//! Wasm exports.
+
+use crate::{
+    error::{update_last_error, CApiError},
+    global::wasmer_global_t,
+    import::wasmer_import_func_t,
+    memory::wasmer_memory_t,
+    module::wasmer_module_t,
+    table::wasmer_table_t,
+    value::{wasmer_value, wasmer_value_t, wasmer_value_tag},
+    wasmer_byte_array, wasmer_result_t,
+};
+use libc::{c_int, uint32_t};
+use std::{ptr, slice};
+use wasmer_runtime::{Instance, Memory, Module, Value};
+use wasmer_runtime_core::{export::Export, module::ExportIndex};
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_export_t;
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_exports_t;
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_export_func_t;
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_export_descriptor_t;
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_export_descriptors_t;
+
+#[repr(C)]
+#[derive(Clone, Copy)]
+pub union wasmer_import_export_value {
+    pub func: *const wasmer_import_func_t,
+    pub table: *const wasmer_table_t,
+    pub memory: *const wasmer_memory_t,
+    pub global: *const wasmer_global_t,
+}
+
+#[allow(non_camel_case_types)]
+#[repr(u32)]
+#[derive(Clone)]
+pub enum wasmer_import_export_kind {
+    WASM_FUNCTION,
+    WASM_GLOBAL,
+    WASM_MEMORY,
+    WASM_TABLE,
+}
+
+/// Gets export descriptors for the given module
+///
+/// The caller owns the object and should call `wasmer_export_descriptors_destroy` to free it.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_export_descriptors(
+    module: *const wasmer_module_t,
+    export_descriptors: *mut *mut wasmer_export_descriptors_t,
+) {
+    let module = &*(module as *const Module);
+
+    let named_export_descriptors: Box<NamedExportDescriptors> = Box::new(NamedExportDescriptors(
+        module.info().exports.iter().map(|e| e.into()).collect(),
+    ));
+    *export_descriptors =
+        Box::into_raw(named_export_descriptors) as *mut wasmer_export_descriptors_t;
+}
+
+pub struct NamedExportDescriptors(Vec<NamedExportDescriptor>);
+
+/// Frees the memory for the given export descriptors
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_export_descriptors_destroy(
+    export_descriptors: *mut wasmer_export_descriptors_t,
+) {
+    if !export_descriptors.is_null() {
+        unsafe { Box::from_raw(export_descriptors as *mut NamedExportDescriptors) };
+    }
+}
+
+/// Gets the length of the export descriptors
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_export_descriptors_len(
+    exports: *mut wasmer_export_descriptors_t,
+) -> c_int {
+    if exports.is_null() {
+        return 0;
+    }
+    (*(exports as *mut NamedExportDescriptors)).0.len() as c_int
+}
+
+/// Gets export descriptor by index
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_export_descriptors_get(
+    export_descriptors: *mut wasmer_export_descriptors_t,
+    idx: c_int,
+) -> *mut wasmer_export_descriptor_t {
+    if export_descriptors.is_null() {
+        return ptr::null_mut();
+    }
+    let named_export_descriptors = &mut *(export_descriptors as *mut NamedExportDescriptors);
+    &mut (*named_export_descriptors).0[idx as usize] as *mut NamedExportDescriptor
+        as *mut wasmer_export_descriptor_t
+}
+
+/// Gets name for the export descriptor
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_descriptor_name(
+    export_descriptor: *mut wasmer_export_descriptor_t,
+) -> wasmer_byte_array {
+    let named_export_descriptor = &*(export_descriptor as *mut NamedExportDescriptor);
+    wasmer_byte_array {
+        bytes: named_export_descriptor.name.as_ptr(),
+        bytes_len: named_export_descriptor.name.len() as u32,
+    }
+}
+
+/// Gets export descriptor kind
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_descriptor_kind(
+    export: *mut wasmer_export_descriptor_t,
+) -> wasmer_import_export_kind {
+    let named_export_descriptor = &*(export as *mut NamedExportDescriptor);
+    named_export_descriptor.kind.clone()
+}
+
+pub(crate) struct NamedExports(pub Vec<NamedExport>);
+
+/// Frees the memory for the given exports
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_exports_destroy(exports: *mut wasmer_exports_t) {
+    if !exports.is_null() {
+        unsafe { Box::from_raw(exports as *mut NamedExports) };
+    }
+}
+
+/// Gets the length of the exports
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_exports_len(exports: *mut wasmer_exports_t) -> c_int {
+    if exports.is_null() {
+        return 0;
+    }
+    (*(exports as *mut NamedExports)).0.len() as c_int
+}
+
+/// Gets wasmer_export by index
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_exports_get(
+    exports: *mut wasmer_exports_t,
+    idx: c_int,
+) -> *mut wasmer_export_t {
+    if exports.is_null() {
+        return ptr::null_mut();
+    }
+    let named_exports = &mut *(exports as *mut NamedExports);
+    &mut (*named_exports).0[idx as usize] as *mut NamedExport as *mut wasmer_export_t
+}
+
+/// Gets wasmer_export kind
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_kind(
+    export: *mut wasmer_export_t,
+) -> wasmer_import_export_kind {
+    let named_export = &*(export as *mut NamedExport);
+    match named_export.export {
+        Export::Table(_) => wasmer_import_export_kind::WASM_TABLE,
+        Export::Function { .. } => wasmer_import_export_kind::WASM_FUNCTION,
+        Export::Global(_) => wasmer_import_export_kind::WASM_GLOBAL,
+        Export::Memory(_) => wasmer_import_export_kind::WASM_MEMORY,
+    }
+}
+
+/// Sets the result parameter to the arity of the params of the wasmer_export_func_t
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_func_params_arity(
+    func: *const wasmer_export_func_t,
+    result: *mut uint32_t,
+) -> wasmer_result_t {
+    let named_export = &*(func as *const NamedExport);
+    let export = &named_export.export;
+    if let Export::Function { ref signature, .. } = *export {
+        *result = signature.params().len() as uint32_t;
+        wasmer_result_t::WASMER_OK
+    } else {
+        update_last_error(CApiError {
+            msg: "func ptr error in wasmer_export_func_params_arity".to_string(),
+        });
+        wasmer_result_t::WASMER_ERROR
+    }
+}
+
+/// Sets the params buffer to the parameter types of the given wasmer_export_func_t
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_func_params(
+    func: *const wasmer_export_func_t,
+    params: *mut wasmer_value_tag,
+    params_len: c_int,
+) -> wasmer_result_t {
+    let named_export = &*(func as *const NamedExport);
+    let export = &named_export.export;
+    if let Export::Function { ref signature, .. } = *export {
+        let params: &mut [wasmer_value_tag] =
+            slice::from_raw_parts_mut(params, params_len as usize);
+        for (i, item) in signature.params().iter().enumerate() {
+            params[i] = item.into();
+        }
+        wasmer_result_t::WASMER_OK
+    } else {
+        update_last_error(CApiError {
+            msg: "func ptr error in wasmer_export_func_params".to_string(),
+        });
+        wasmer_result_t::WASMER_ERROR
+    }
+}
+
+/// Sets the returns buffer to the parameter types of the given wasmer_export_func_t
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_func_returns(
+    func: *const wasmer_export_func_t,
+    returns: *mut wasmer_value_tag,
+    returns_len: c_int,
+) -> wasmer_result_t {
+    let named_export = &*(func as *const NamedExport);
+    let export = &named_export.export;
+    if let Export::Function { ref signature, .. } = *export {
+        let returns: &mut [wasmer_value_tag] =
+            slice::from_raw_parts_mut(returns, returns_len as usize);
+        for (i, item) in signature.returns().iter().enumerate() {
+            returns[i] = item.into();
+        }
+        wasmer_result_t::WASMER_OK
+    } else {
+        update_last_error(CApiError {
+            msg: "func ptr error in wasmer_export_func_returns".to_string(),
+        });
+        wasmer_result_t::WASMER_ERROR
+    }
+}
+
+/// Sets the result parameter to the arity of the returns of the wasmer_export_func_t
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_func_returns_arity(
+    func: *const wasmer_export_func_t,
+    result: *mut uint32_t,
+) -> wasmer_result_t {
+    let named_export = &*(func as *const NamedExport);
+    let export = &named_export.export;
+    if let Export::Function { ref signature, .. } = *export {
+        *result = signature.returns().len() as uint32_t;
+        wasmer_result_t::WASMER_OK
+    } else {
+        update_last_error(CApiError {
+            msg: "func ptr error in wasmer_export_func_results_arity".to_string(),
+        });
+        wasmer_result_t::WASMER_ERROR
+    }
+}
+
+/// Gets export func from export
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_to_func(
+    export: *const wasmer_export_t,
+) -> *const wasmer_export_func_t {
+    export as *const wasmer_export_func_t
+}
+
+/// Gets a memory pointer from an export pointer.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_to_memory(
+    export: *const wasmer_export_t,
+    memory: *mut *mut wasmer_memory_t,
+) -> wasmer_result_t {
+    let named_export = &*(export as *const NamedExport);
+    let export = &named_export.export;
+
+    if let Export::Memory(exported_memory) = export {
+        *memory = exported_memory as *const Memory as *mut wasmer_memory_t;
+        wasmer_result_t::WASMER_OK
+    } else {
+        update_last_error(CApiError {
+            msg: "cannot cast the `wasmer_export_t` pointer to a  `wasmer_memory_t` \
+                  pointer because it does not represent a memory export."
+                .to_string(),
+        });
+        wasmer_result_t::WASMER_ERROR
+    }
+}
+
+/// Gets name from wasmer_export
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_export_name(export: *mut wasmer_export_t) -> wasmer_byte_array {
+    let named_export = &*(export as *mut NamedExport);
+    wasmer_byte_array {
+        bytes: named_export.name.as_ptr(),
+        bytes_len: named_export.name.len() as u32,
+    }
+}
+
+/// Calls a `func` with the provided parameters.
+/// Results are set using the provided `results` pointer.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_export_func_call(
+    func: *const wasmer_export_func_t,
+    params: *const wasmer_value_t,
+    params_len: c_int,
+    results: *mut wasmer_value_t,
+    results_len: c_int,
+) -> wasmer_result_t {
+    if func.is_null() {
+        update_last_error(CApiError {
+            msg: "func ptr is null".to_string(),
+        });
+        return wasmer_result_t::WASMER_ERROR;
+    }
+    if params.is_null() {
+        update_last_error(CApiError {
+            msg: "params ptr is null".to_string(),
+        });
+        return wasmer_result_t::WASMER_ERROR;
+    }
+
+    let params: &[wasmer_value_t] = slice::from_raw_parts(params, params_len as usize);
+    let params: Vec<Value> = params.iter().cloned().map(|x| x.into()).collect();
+
+    let named_export = &*(func as *mut NamedExport);
+
+    let results: &mut [wasmer_value_t] = slice::from_raw_parts_mut(results, results_len as usize);
+
+    let instance = &*named_export.instance;
+    let result = instance.call(&named_export.name, &params[..]);
+    match result {
+        Ok(results_vec) => {
+            if !results_vec.is_empty() {
+                let ret = match results_vec[0] {
+                    Value::I32(x) => wasmer_value_t {
+                        tag: wasmer_value_tag::WASM_I32,
+                        value: wasmer_value { I32: x },
+                    },
+                    Value::I64(x) => wasmer_value_t {
+                        tag: wasmer_value_tag::WASM_I64,
+                        value: wasmer_value { I64: x },
+                    },
+                    Value::F32(x) => wasmer_value_t {
+                        tag: wasmer_value_tag::WASM_F32,
+                        value: wasmer_value { F32: x },
+                    },
+                    Value::F64(x) => wasmer_value_t {
+                        tag: wasmer_value_tag::WASM_F64,
+                        value: wasmer_value { F64: x },
+                    },
+                };
+                results[0] = ret;
+            }
+            wasmer_result_t::WASMER_OK
+        }
+        Err(err) => {
+            update_last_error(err);
+            wasmer_result_t::WASMER_ERROR
+        }
+    }
+}
+
+impl From<(&std::string::String, &ExportIndex)> for NamedExportDescriptor {
+    fn from((name, export_index): (&String, &ExportIndex)) -> Self {
+        let kind = match *export_index {
+            ExportIndex::Memory(_) => wasmer_import_export_kind::WASM_MEMORY,
+            ExportIndex::Global(_) => wasmer_import_export_kind::WASM_GLOBAL,
+            ExportIndex::Table(_) => wasmer_import_export_kind::WASM_TABLE,
+            ExportIndex::Func(_) => wasmer_import_export_kind::WASM_FUNCTION,
+        };
+        NamedExportDescriptor {
+            name: name.clone(),
+            kind,
+        }
+    }
+}
+
+pub(crate) struct NamedExport {
+    pub(crate) name: String,
+    pub(crate) export: Export,
+    pub(crate) instance: *mut Instance,
+}
+
+pub(crate) struct NamedExportDescriptor {
+    name: String,
+    kind: wasmer_import_export_kind,
+}

lib/runtime-c-api/src/global.rs

@@ -0,0 +1,70 @@
+//! Wasm global.
+
+use crate::value::{wasmer_value_t, wasmer_value_tag};
+use wasmer_runtime::Global;
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_global_descriptor_t {
+    mutable: bool,
+    kind: wasmer_value_tag,
+}
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_global_t;
+
+/// Creates a new Global and returns a pointer to it.
+/// The caller owns the object and should call `wasmer_global_destroy` to free it.
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_global_new(
+    value: wasmer_value_t,
+    mutable: bool,
+) -> *mut wasmer_global_t {
+    let global = if mutable {
+        Global::new_mutable(value.into())
+    } else {
+        Global::new(value.into())
+    };
+    Box::into_raw(Box::new(global)) as *mut wasmer_global_t
+}
+
+/// Gets the value stored by the given Global
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_global_get(global: *mut wasmer_global_t) -> wasmer_value_t {
+    let global = unsafe { &*(global as *mut Global) };
+    let value: wasmer_value_t = global.get().into();
+    value
+}
+
+/// Sets the value stored by the given Global
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_global_set(global: *mut wasmer_global_t, value: wasmer_value_t) {
+    let global = unsafe { &*(global as *mut Global) };
+    global.set(value.into());
+}
+
+/// Returns a descriptor (type, mutability) of the given Global
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_global_get_descriptor(
+    global: *mut wasmer_global_t,
+) -> wasmer_global_descriptor_t {
+    let global = unsafe { &*(global as *mut Global) };
+    let descriptor = global.descriptor();
+    wasmer_global_descriptor_t {
+        mutable: descriptor.mutable,
+        kind: descriptor.ty.into(),
+    }
+}
+
+/// Frees memory for the given Global
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_global_destroy(global: *mut wasmer_global_t) {
+    if !global.is_null() {
+        unsafe { Box::from_raw(global as *mut Global) };
+    }
+}

lib/runtime-c-api/src/import.rs

@@ -0,0 +1,358 @@
+//! Wasm imports.
+
+use crate::{
+    error::{update_last_error, CApiError},
+    export::{wasmer_import_export_kind, wasmer_import_export_value},
+    module::wasmer_module_t,
+    value::wasmer_value_tag,
+    wasmer_byte_array, wasmer_result_t,
+};
+use libc::{c_int, uint32_t};
+use std::{ffi::c_void, ptr, slice, sync::Arc};
+use wasmer_runtime::Module;
+use wasmer_runtime_core::{
+    export::{Context, Export, FuncPointer},
+    module::ImportName,
+    types::{FuncSig, Type},
+};
+
+#[repr(C)]
+pub struct wasmer_import_t {
+    pub module_name: wasmer_byte_array,
+    pub import_name: wasmer_byte_array,
+    pub tag: wasmer_import_export_kind,
+    pub value: wasmer_import_export_value,
+}
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_import_func_t;
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_import_descriptor_t;
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_import_descriptors_t;
+
+/// Gets import descriptors for the given module
+///
+/// The caller owns the object and should call `wasmer_import_descriptors_destroy` to free it.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_import_descriptors(
+    module: *const wasmer_module_t,
+    import_descriptors: *mut *mut wasmer_import_descriptors_t,
+) {
+    let module = &*(module as *const Module);
+    let total_imports = module.info().imported_functions.len()
+        + module.info().imported_tables.len()
+        + module.info().imported_globals.len()
+        + module.info().imported_memories.len();
+    let mut descriptors: Vec<NamedImportDescriptor> = Vec::with_capacity(total_imports);
+
+    for (
+        _index,
+        ImportName {
+            namespace_index,
+            name_index,
+        },
+    ) in &module.info().imported_functions
+    {
+        let namespace = module.info().namespace_table.get(*namespace_index);
+        let name = module.info().name_table.get(*name_index);
+        descriptors.push(NamedImportDescriptor {
+            module: namespace.to_string(),
+            name: name.to_string(),
+            kind: wasmer_import_export_kind::WASM_FUNCTION,
+        });
+    }
+
+    for (
+        _index,
+        (
+            ImportName {
+                namespace_index,
+                name_index,
+            },
+            _,
+        ),
+    ) in &module.info().imported_tables
+    {
+        let namespace = module.info().namespace_table.get(*namespace_index);
+        let name = module.info().name_table.get(*name_index);
+        descriptors.push(NamedImportDescriptor {
+            module: namespace.to_string(),
+            name: name.to_string(),
+            kind: wasmer_import_export_kind::WASM_TABLE,
+        });
+    }
+
+    for (
+        _index,
+        (
+            ImportName {
+                namespace_index,
+                name_index,
+            },
+            _,
+        ),
+    ) in &module.info().imported_globals
+    {
+        let namespace = module.info().namespace_table.get(*namespace_index);
+        let name = module.info().name_table.get(*name_index);
+        descriptors.push(NamedImportDescriptor {
+            module: namespace.to_string(),
+            name: name.to_string(),
+            kind: wasmer_import_export_kind::WASM_GLOBAL,
+        });
+    }
+
+    for (
+        _index,
+        (
+            ImportName {
+                namespace_index,
+                name_index,
+            },
+            _,
+        ),
+    ) in &module.info().imported_memories
+    {
+        let namespace = module.info().namespace_table.get(*namespace_index);
+        let name = module.info().name_table.get(*name_index);
+        descriptors.push(NamedImportDescriptor {
+            module: namespace.to_string(),
+            name: name.to_string(),
+            kind: wasmer_import_export_kind::WASM_MEMORY,
+        });
+    }
+
+    let named_import_descriptors: Box<NamedImportDescriptors> =
+        Box::new(NamedImportDescriptors(descriptors));
+    *import_descriptors =
+        Box::into_raw(named_import_descriptors) as *mut wasmer_import_descriptors_t;
+}
+
+pub struct NamedImportDescriptors(Vec<NamedImportDescriptor>);
+
+/// Frees the memory for the given import descriptors
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_import_descriptors_destroy(
+    import_descriptors: *mut wasmer_import_descriptors_t,
+) {
+    if !import_descriptors.is_null() {
+        unsafe { Box::from_raw(import_descriptors as *mut NamedImportDescriptors) };
+    }
+}
+
+/// Gets the length of the import descriptors
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_import_descriptors_len(
+    exports: *mut wasmer_import_descriptors_t,
+) -> c_int {
+    if exports.is_null() {
+        return 0;
+    }
+    (*(exports as *mut NamedImportDescriptors)).0.len() as c_int
+}
+
+/// Gets import descriptor by index
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_import_descriptors_get(
+    import_descriptors: *mut wasmer_import_descriptors_t,
+    idx: c_int,
+) -> *mut wasmer_import_descriptor_t {
+    if import_descriptors.is_null() {
+        return ptr::null_mut();
+    }
+    let named_import_descriptors = &mut *(import_descriptors as *mut NamedImportDescriptors);
+    &mut (*named_import_descriptors).0[idx as usize] as *mut NamedImportDescriptor
+        as *mut wasmer_import_descriptor_t
+}
+
+/// Gets name for the import descriptor
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_import_descriptor_name(
+    import_descriptor: *mut wasmer_import_descriptor_t,
+) -> wasmer_byte_array {
+    let named_import_descriptor = &*(import_descriptor as *mut NamedImportDescriptor);
+    wasmer_byte_array {
+        bytes: named_import_descriptor.name.as_ptr(),
+        bytes_len: named_import_descriptor.name.len() as u32,
+    }
+}
+
+/// Gets module name for the import descriptor
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_import_descriptor_module_name(
+    import_descriptor: *mut wasmer_import_descriptor_t,
+) -> wasmer_byte_array {
+    let named_import_descriptor = &*(import_descriptor as *mut NamedImportDescriptor);
+    wasmer_byte_array {
+        bytes: named_import_descriptor.module.as_ptr(),
+        bytes_len: named_import_descriptor.module.len() as u32,
+    }
+}
+
+/// Gets export descriptor kind
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_import_descriptor_kind(
+    export: *mut wasmer_import_descriptor_t,
+) -> wasmer_import_export_kind {
+    let named_import_descriptor = &*(export as *mut NamedImportDescriptor);
+    named_import_descriptor.kind.clone()
+}
+
+/// Sets the result parameter to the arity of the params of the wasmer_import_func_t
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_import_func_params_arity(
+    func: *const wasmer_import_func_t,
+    result: *mut uint32_t,
+) -> wasmer_result_t {
+    let export = &*(func as *const Export);
+    if let Export::Function { ref signature, .. } = *export {
+        *result = signature.params().len() as uint32_t;
+        wasmer_result_t::WASMER_OK
+    } else {
+        update_last_error(CApiError {
+            msg: "func ptr error in wasmer_import_func_params_arity".to_string(),
+        });
+        wasmer_result_t::WASMER_ERROR
+    }
+}
+
+/// Creates new func
+///
+/// The caller owns the object and should call `wasmer_import_func_destroy` to free it.
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_import_func_new(
+    func: extern "C" fn(data: *mut c_void),
+    params: *const wasmer_value_tag,
+    params_len: c_int,
+    returns: *const wasmer_value_tag,
+    returns_len: c_int,
+) -> *mut wasmer_import_func_t {
+    let params: &[wasmer_value_tag] = slice::from_raw_parts(params, params_len as usize);
+    let params: Vec<Type> = params.iter().cloned().map(|x| x.into()).collect();
+    let returns: &[wasmer_value_tag] = slice::from_raw_parts(returns, returns_len as usize);
+    let returns: Vec<Type> = returns.iter().cloned().map(|x| x.into()).collect();
+
+    let export = Box::new(Export::Function {
+        func: FuncPointer::new(func as _),
+        ctx: Context::Internal,
+        signature: Arc::new(FuncSig::new(params, returns)),
+    });
+    Box::into_raw(export) as *mut wasmer_import_func_t
+}
+
+/// Sets the params buffer to the parameter types of the given wasmer_import_func_t
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_import_func_params(
+    func: *const wasmer_import_func_t,
+    params: *mut wasmer_value_tag,
+    params_len: c_int,
+) -> wasmer_result_t {
+    let export = &*(func as *const Export);
+    if let Export::Function { ref signature, .. } = *export {
+        let params: &mut [wasmer_value_tag] =
+            slice::from_raw_parts_mut(params, params_len as usize);
+        for (i, item) in signature.params().iter().enumerate() {
+            params[i] = item.into();
+        }
+        wasmer_result_t::WASMER_OK
+    } else {
+        update_last_error(CApiError {
+            msg: "func ptr error in wasmer_import_func_params".to_string(),
+        });
+        wasmer_result_t::WASMER_ERROR
+    }
+}
+
+/// Sets the returns buffer to the parameter types of the given wasmer_import_func_t
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_import_func_returns(
+    func: *const wasmer_import_func_t,
+    returns: *mut wasmer_value_tag,
+    returns_len: c_int,
+) -> wasmer_result_t {
+    let export = &*(func as *const Export);
+    if let Export::Function { ref signature, .. } = *export {
+        let returns: &mut [wasmer_value_tag] =
+            slice::from_raw_parts_mut(returns, returns_len as usize);
+        for (i, item) in signature.returns().iter().enumerate() {
+            returns[i] = item.into();
+        }
+        wasmer_result_t::WASMER_OK
+    } else {
+        update_last_error(CApiError {
+            msg: "func ptr error in wasmer_import_func_returns".to_string(),
+        });
+        wasmer_result_t::WASMER_ERROR
+    }
+}
+
+/// Sets the result parameter to the arity of the returns of the wasmer_import_func_t
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+#[allow(clippy::cast_ptr_alignment)]
+pub unsafe extern "C" fn wasmer_import_func_returns_arity(
+    func: *const wasmer_import_func_t,
+    result: *mut uint32_t,
+) -> wasmer_result_t {
+    let export = &*(func as *const Export);
+    if let Export::Function { ref signature, .. } = *export {
+        *result = signature.returns().len() as uint32_t;
+        wasmer_result_t::WASMER_OK
+    } else {
+        update_last_error(CApiError {
+            msg: "func ptr error in wasmer_import_func_results_arity".to_string(),
+        });
+        wasmer_result_t::WASMER_ERROR
+    }
+}
+
+/// Frees memory for the given Func
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_import_func_destroy(func: *mut wasmer_import_func_t) {
+    if !func.is_null() {
+        unsafe { Box::from_raw(func as *mut Export) };
+    }
+}
+
+struct NamedImportDescriptor {
+    module: String,
+    name: String,
+    kind: wasmer_import_export_kind,
+}

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

@@ -0,0 +1,256 @@
+//! Wasm instance.
+
+use crate::{
+    error::{update_last_error, CApiError},
+    export::{wasmer_exports_t, wasmer_import_export_kind, NamedExport, NamedExports},
+    import::wasmer_import_t,
+    memory::wasmer_memory_t,
+    value::{wasmer_value, wasmer_value_t, wasmer_value_tag},
+    wasmer_result_t,
+};
+use libc::{c_char, c_int, c_void, uint32_t, uint8_t};
+use std::{collections::HashMap, ffi::CStr, slice};
+use wasmer_runtime::{Ctx, Global, ImportObject, Instance, Memory, Table, Value};
+use wasmer_runtime_core::{export::Export, import::Namespace};
+
+#[repr(C)]
+pub struct wasmer_instance_t;
+
+#[repr(C)]
+pub struct wasmer_instance_context_t;
+
+/// Creates a new Instance from the given wasm bytes and imports.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_instantiate(
+    instance: *mut *mut wasmer_instance_t,
+    wasm_bytes: *mut uint8_t,
+    wasm_bytes_len: uint32_t,
+    imports: *mut wasmer_import_t,
+    imports_len: c_int,
+) -> wasmer_result_t {
+    if wasm_bytes.is_null() {
+        update_last_error(CApiError {
+            msg: "wasm bytes ptr is null".to_string(),
+        });
+        return wasmer_result_t::WASMER_ERROR;
+    }
+    let imports: &[wasmer_import_t] = slice::from_raw_parts(imports, imports_len as usize);
+    let mut import_object = ImportObject::new();
+    let mut namespaces = HashMap::new();
+    for import in imports {
+        let module_name = slice::from_raw_parts(
+            import.module_name.bytes,
+            import.module_name.bytes_len as usize,
+        );
+        let module_name = if let Ok(s) = std::str::from_utf8(module_name) {
+            s
+        } else {
+            update_last_error(CApiError {
+                msg: "error converting module name to string".to_string(),
+            });
+            return wasmer_result_t::WASMER_ERROR;
+        };
+        let import_name = slice::from_raw_parts(
+            import.import_name.bytes,
+            import.import_name.bytes_len as usize,
+        );
+        let import_name = if let Ok(s) = std::str::from_utf8(import_name) {
+            s
+        } else {
+            update_last_error(CApiError {
+                msg: "error converting import_name to string".to_string(),
+            });
+            return wasmer_result_t::WASMER_ERROR;
+        };
+
+        let namespace = namespaces.entry(module_name).or_insert_with(Namespace::new);
+
+        let export = match import.tag {
+            wasmer_import_export_kind::WASM_MEMORY => {
+                let mem = import.value.memory as *mut Memory;
+                Export::Memory((&*mem).clone())
+            }
+            wasmer_import_export_kind::WASM_FUNCTION => {
+                let func_export = import.value.func as *mut Export;
+                (&*func_export).clone()
+            }
+            wasmer_import_export_kind::WASM_GLOBAL => {
+                let global = import.value.global as *mut Global;
+                Export::Global((&*global).clone())
+            }
+            wasmer_import_export_kind::WASM_TABLE => {
+                let table = import.value.table as *mut Table;
+                Export::Table((&*table).clone())
+            }
+        };
+        namespace.insert(import_name, export);
+    }
+    for (module_name, namespace) in namespaces.into_iter() {
+        import_object.register(module_name, namespace);
+    }
+
+    let bytes: &[u8] = slice::from_raw_parts_mut(wasm_bytes, wasm_bytes_len as usize);
+    let result = wasmer_runtime::instantiate(bytes, &import_object);
+    let new_instance = match result {
+        Ok(instance) => instance,
+        Err(_error) => {
+            // TODO the trait bound `wasmer_runtime::error::Error: std::error::Error` is not satisfied
+            //update_last_error(error);
+            update_last_error(CApiError {
+                msg: "error instantiating".to_string(),
+            });
+            return wasmer_result_t::WASMER_ERROR;
+        }
+    };
+    *instance = Box::into_raw(Box::new(new_instance)) as *mut wasmer_instance_t;
+    wasmer_result_t::WASMER_OK
+}
+
+/// Calls an instances exported function by `name` with the provided parameters.
+/// Results are set using the provided `results` pointer.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_instance_call(
+    instance: *mut wasmer_instance_t,
+    name: *const c_char,
+    params: *const wasmer_value_t,
+    params_len: c_int,
+    results: *mut wasmer_value_t,
+    results_len: c_int,
+) -> wasmer_result_t {
+    if instance.is_null() {
+        update_last_error(CApiError {
+            msg: "instance ptr is null".to_string(),
+        });
+        return wasmer_result_t::WASMER_ERROR;
+    }
+    if name.is_null() {
+        update_last_error(CApiError {
+            msg: "name ptr is null".to_string(),
+        });
+        return wasmer_result_t::WASMER_ERROR;
+    }
+    if params.is_null() {
+        update_last_error(CApiError {
+            msg: "params ptr is null".to_string(),
+        });
+        return wasmer_result_t::WASMER_ERROR;
+    }
+
+    let params: &[wasmer_value_t] = slice::from_raw_parts(params, params_len as usize);
+    let params: Vec<Value> = params.iter().cloned().map(|x| x.into()).collect();
+
+    let func_name_c = CStr::from_ptr(name);
+    let func_name_r = func_name_c.to_str().unwrap();
+
+    let results: &mut [wasmer_value_t] = slice::from_raw_parts_mut(results, results_len as usize);
+    let result = (&*(instance as *mut Instance)).call(func_name_r, &params[..]);
+
+    match result {
+        Ok(results_vec) => {
+            if !results_vec.is_empty() {
+                let ret = match results_vec[0] {
+                    Value::I32(x) => wasmer_value_t {
+                        tag: wasmer_value_tag::WASM_I32,
+                        value: wasmer_value { I32: x },
+                    },
+                    Value::I64(x) => wasmer_value_t {
+                        tag: wasmer_value_tag::WASM_I64,
+                        value: wasmer_value { I64: x },
+                    },
+                    Value::F32(x) => wasmer_value_t {
+                        tag: wasmer_value_tag::WASM_F32,
+                        value: wasmer_value { F32: x },
+                    },
+                    Value::F64(x) => wasmer_value_t {
+                        tag: wasmer_value_tag::WASM_F64,
+                        value: wasmer_value { F64: x },
+                    },
+                };
+                results[0] = ret;
+            }
+            wasmer_result_t::WASMER_OK
+        }
+        Err(err) => {
+            update_last_error(err);
+            wasmer_result_t::WASMER_ERROR
+        }
+    }
+}
+
+/// Gets Exports for the given instance
+///
+/// The caller owns the object and should call `wasmer_exports_destroy` to free it.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_instance_exports(
+    instance: *mut wasmer_instance_t,
+    exports: *mut *mut wasmer_exports_t,
+) {
+    let instance_ref = &mut *(instance as *mut Instance);
+    let mut exports_vec: Vec<NamedExport> = Vec::with_capacity(instance_ref.exports().count());
+    for (name, export) in instance_ref.exports() {
+        exports_vec.push(NamedExport {
+            name: name.clone(),
+            export: export.clone(),
+            instance: instance as *mut Instance,
+        });
+    }
+    let named_exports: Box<NamedExports> = Box::new(NamedExports(exports_vec));
+    *exports = Box::into_raw(named_exports) as *mut wasmer_exports_t;
+}
+
+/// Sets the `data` field of the instance context. This context will be
+/// passed to all imported function for instance.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_instance_context_data_set(
+    instance: *mut wasmer_instance_t,
+    data_ptr: *mut c_void,
+) {
+    let instance_ref = unsafe { &mut *(instance as *mut Instance) };
+    instance_ref.context_mut().data = data_ptr;
+}
+
+/// Gets the memory within the context at the index `memory_idx`.
+/// The index is always 0 until multiple memories are supported.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_instance_context_memory(
+    ctx: *const wasmer_instance_context_t,
+    _memory_idx: uint32_t,
+) -> *const wasmer_memory_t {
+    let ctx = unsafe { &*(ctx as *const Ctx) };
+    let memory = ctx.memory(0);
+    memory as *const Memory as *const wasmer_memory_t
+}
+
+/// Gets the `data` field within the context.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_instance_context_data_get(
+    ctx: *const wasmer_instance_context_t,
+) -> *mut c_void {
+    let ctx = unsafe { &*(ctx as *const Ctx) };
+    ctx.data
+}
+
+/// Frees memory for the given Instance
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_instance_destroy(instance: *mut wasmer_instance_t) {
+    if !instance.is_null() {
+        unsafe { Box::from_raw(instance as *mut Instance) };
+    }
+}

lib/runtime-c-api/src/memory.rs

@@ -0,0 +1,108 @@
+//! Wasm memory.o
+
+use crate::{error::update_last_error, wasmer_limits_t, wasmer_result_t};
+use libc::{uint32_t, uint8_t};
+use std::cell::Cell;
+use wasmer_runtime::Memory;
+use wasmer_runtime_core::{
+    types::MemoryDescriptor,
+    units::{Bytes, Pages},
+};
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_memory_t;
+
+/// Creates a new Memory for the given descriptor and initializes the given
+/// pointer to pointer to a pointer to the new memory.
+///
+/// The caller owns the object and should call `wasmer_memory_destroy` to free it.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_memory_new(
+    memory: *mut *mut wasmer_memory_t,
+    limits: wasmer_limits_t,
+) -> wasmer_result_t {
+    let max = if limits.max.has_some {
+        Some(Pages(limits.max.some))
+    } else {
+        None
+    };
+    let desc = MemoryDescriptor {
+        minimum: Pages(limits.min),
+        maximum: max,
+        shared: false,
+    };
+    let result = Memory::new(desc);
+    let new_memory = match result {
+        Ok(memory) => memory,
+        Err(error) => {
+            update_last_error(error);
+            return wasmer_result_t::WASMER_ERROR;
+        }
+    };
+    *memory = Box::into_raw(Box::new(new_memory)) as *mut wasmer_memory_t;
+    wasmer_result_t::WASMER_OK
+}
+
+/// Grows a Memory by the given number of pages.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_memory_grow(
+    memory: *mut wasmer_memory_t,
+    delta: uint32_t,
+) -> wasmer_result_t {
+    let memory = unsafe { &*(memory as *mut Memory) };
+    let delta_result = memory.grow(Pages(delta));
+    match delta_result {
+        Ok(_) => wasmer_result_t::WASMER_OK,
+        Err(grow_error) => {
+            update_last_error(grow_error);
+            wasmer_result_t::WASMER_ERROR
+        }
+    }
+}
+
+/// Returns the current length in pages of the given memory
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_memory_length(memory: *const wasmer_memory_t) -> uint32_t {
+    let memory = unsafe { &*(memory as *const Memory) };
+    let Pages(len) = memory.size();
+    len
+}
+
+/// Gets the start pointer to the bytes within a Memory
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_memory_data(mem: *const wasmer_memory_t) -> *mut uint8_t {
+    let memory = unsafe { &*(mem as *const Memory) };
+    memory.view::<u8>()[..].as_ptr() as *mut Cell<u8> as *mut u8
+}
+
+/// Gets the size in bytes of a Memory
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_memory_data_length(mem: *mut wasmer_memory_t) -> uint32_t {
+    let memory = mem as *mut Memory;
+    let Bytes(len) = unsafe { (*memory).size().bytes() };
+    len as uint32_t
+}
+
+/// Frees memory for the given Memory
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_memory_destroy(memory: *mut wasmer_memory_t) {
+    if !memory.is_null() {
+        unsafe { Box::from_raw(memory as *mut Memory) };
+    }
+}

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

@@ -0,0 +1,289 @@
+//! Wasm module.
+
+use crate::{
+    error::{update_last_error, CApiError},
+    export::wasmer_import_export_kind,
+    import::wasmer_import_t,
+    instance::wasmer_instance_t,
+    wasmer_byte_array, wasmer_result_t,
+};
+use libc::{c_int, uint32_t, uint8_t};
+use std::{collections::HashMap, slice};
+use wasmer_runtime::{compile, default_compiler, Global, ImportObject, Memory, Module, Table};
+use wasmer_runtime_core::{cache::Artifact, export::Export, import::Namespace, load_cache_with};
+
+#[repr(C)]
+pub struct wasmer_module_t;
+
+#[repr(C)]
+pub struct wasmer_serialized_module_t;
+
+/// Creates a new Module from the given wasm bytes.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_compile(
+    module: *mut *mut wasmer_module_t,
+    wasm_bytes: *mut uint8_t,
+    wasm_bytes_len: uint32_t,
+) -> wasmer_result_t {
+    let bytes: &[u8] = slice::from_raw_parts_mut(wasm_bytes, wasm_bytes_len as usize);
+    let result = compile(bytes);
+    let new_module = match result {
+        Ok(instance) => instance,
+        Err(error) => {
+            update_last_error(error);
+            return wasmer_result_t::WASMER_ERROR;
+        }
+    };
+    *module = Box::into_raw(Box::new(new_module)) as *mut wasmer_module_t;
+    wasmer_result_t::WASMER_OK
+}
+
+/// Returns true for valid wasm bytes and false for invalid bytes
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_validate(
+    wasm_bytes: *const uint8_t,
+    wasm_bytes_len: uint32_t,
+) -> bool {
+    if wasm_bytes.is_null() {
+        return false;
+    }
+    let bytes: &[u8] = slice::from_raw_parts(wasm_bytes, wasm_bytes_len as usize);
+
+    wasmer_runtime_core::validate(bytes)
+}
+
+/// Creates a new Instance from the given module and imports.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_module_instantiate(
+    module: *const wasmer_module_t,
+    instance: *mut *mut wasmer_instance_t,
+    imports: *mut wasmer_import_t,
+    imports_len: c_int,
+) -> wasmer_result_t {
+    let imports: &[wasmer_import_t] = slice::from_raw_parts(imports, imports_len as usize);
+    let mut import_object = ImportObject::new();
+    let mut namespaces = HashMap::new();
+    for import in imports {
+        let module_name = slice::from_raw_parts(
+            import.module_name.bytes,
+            import.module_name.bytes_len as usize,
+        );
+        let module_name = if let Ok(s) = std::str::from_utf8(module_name) {
+            s
+        } else {
+            update_last_error(CApiError {
+                msg: "error converting module name to string".to_string(),
+            });
+            return wasmer_result_t::WASMER_ERROR;
+        };
+        let import_name = slice::from_raw_parts(
+            import.import_name.bytes,
+            import.import_name.bytes_len as usize,
+        );
+        let import_name = if let Ok(s) = std::str::from_utf8(import_name) {
+            s
+        } else {
+            update_last_error(CApiError {
+                msg: "error converting import_name to string".to_string(),
+            });
+            return wasmer_result_t::WASMER_ERROR;
+        };
+
+        let namespace = namespaces.entry(module_name).or_insert_with(Namespace::new);
+
+        let export = match import.tag {
+            wasmer_import_export_kind::WASM_MEMORY => {
+                let mem = import.value.memory as *mut Memory;
+                Export::Memory((&*mem).clone())
+            }
+            wasmer_import_export_kind::WASM_FUNCTION => {
+                let func_export = import.value.func as *mut Export;
+                (&*func_export).clone()
+            }
+            wasmer_import_export_kind::WASM_GLOBAL => {
+                let global = import.value.global as *mut Global;
+                Export::Global((&*global).clone())
+            }
+            wasmer_import_export_kind::WASM_TABLE => {
+                let table = import.value.table as *mut Table;
+                Export::Table((&*table).clone())
+            }
+        };
+        namespace.insert(import_name, export);
+    }
+    for (module_name, namespace) in namespaces.into_iter() {
+        import_object.register(module_name, namespace);
+    }
+
+    let module = &*(module as *const Module);
+    let new_instance = if let Ok(res) = module.instantiate(&import_object) {
+        res
+    } else {
+        update_last_error(CApiError {
+            msg: "error instantiating from module".to_string(),
+        });
+        return wasmer_result_t::WASMER_ERROR;
+    };
+    *instance = Box::into_raw(Box::new(new_instance)) as *mut wasmer_instance_t;
+    wasmer_result_t::WASMER_OK
+}
+
+/// Serialize the given Module.
+///
+/// The caller owns the object and should call `wasmer_serialized_module_destroy` to free it.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_module_serialize(
+    serialized_module: *mut *mut wasmer_serialized_module_t,
+    module: *const wasmer_module_t,
+) -> wasmer_result_t {
+    let module = &*(module as *const Module);
+
+    match module.cache() {
+        Ok(artifact) => match artifact.serialize() {
+            Ok(serialized_artifact) => {
+                *serialized_module = Box::into_raw(Box::new(serialized_artifact)) as _;
+
+                wasmer_result_t::WASMER_OK
+            }
+            Err(_) => {
+                update_last_error(CApiError {
+                    msg: "Failed to serialize the module artifact".to_string(),
+                });
+                wasmer_result_t::WASMER_ERROR
+            }
+        },
+        Err(_) => {
+            update_last_error(CApiError {
+                msg: "Failed to serialize the module".to_string(),
+            });
+            wasmer_result_t::WASMER_ERROR
+        }
+    }
+}
+
+/// Get bytes of the serialized module.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_serialized_module_bytes(
+    serialized_module: *const wasmer_serialized_module_t,
+) -> wasmer_byte_array {
+    let serialized_module = &*(serialized_module as *const &[u8]);
+
+    wasmer_byte_array {
+        bytes: serialized_module.as_ptr(),
+        bytes_len: serialized_module.len() as u32,
+    }
+}
+
+/// Transform a sequence of bytes into a serialized module.
+///
+/// The caller owns the object and should call `wasmer_serialized_module_destroy` to free it.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_serialized_module_from_bytes(
+    serialized_module: *mut *mut wasmer_serialized_module_t,
+    serialized_module_bytes: *const uint8_t,
+    serialized_module_bytes_length: uint32_t,
+) -> wasmer_result_t {
+    if serialized_module.is_null() {
+        update_last_error(CApiError {
+            msg: "`serialized_module_bytes` pointer is null".to_string(),
+        });
+        return wasmer_result_t::WASMER_ERROR;
+    }
+
+    let serialized_module_bytes: &[u8] = slice::from_raw_parts(
+        serialized_module_bytes,
+        serialized_module_bytes_length as usize,
+    );
+
+    *serialized_module = Box::into_raw(Box::new(serialized_module_bytes)) as _;
+    wasmer_result_t::WASMER_OK
+}
+
+/// Deserialize the given serialized module.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_module_deserialize(
+    module: *mut *mut wasmer_module_t,
+    serialized_module: *const wasmer_serialized_module_t,
+) -> wasmer_result_t {
+    if serialized_module.is_null() {
+        update_last_error(CApiError {
+            msg: "`serialized_module` pointer is null".to_string(),
+        });
+        return wasmer_result_t::WASMER_ERROR;
+    }
+
+    let serialized_module: &[u8] = &*(serialized_module as *const &[u8]);
+
+    match Artifact::deserialize(serialized_module) {
+        Ok(artifact) => match load_cache_with(artifact, default_compiler()) {
+            Ok(deserialized_module) => {
+                *module = Box::into_raw(Box::new(deserialized_module)) as _;
+                wasmer_result_t::WASMER_OK
+            }
+            Err(_) => {
+                update_last_error(CApiError {
+                    msg: "Failed to compile the serialized module".to_string(),
+                });
+                wasmer_result_t::WASMER_ERROR
+            }
+        },
+        Err(_) => {
+            update_last_error(CApiError {
+                msg: "Failed to deserialize the module".to_string(),
+            });
+            wasmer_result_t::WASMER_ERROR
+        }
+    }
+}
+
+/// Frees memory for the given serialized Module.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_serialized_module_destroy(
+    serialized_module: *mut wasmer_serialized_module_t,
+) {
+    if !serialized_module.is_null() {
+        unsafe { Box::from_raw(serialized_module as *mut &[u8]) };
+    }
+}
+
+/// Frees memory for the given Module
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_module_destroy(module: *mut wasmer_module_t) {
+    if !module.is_null() {
+        unsafe { Box::from_raw(module as *mut Module) };
+    }
+}

lib/runtime-c-api/src/table.rs

@@ -0,0 +1,86 @@
+//! Wasm tables.
+
+use crate::{error::update_last_error, wasmer_limits_t, wasmer_result_t};
+use libc::uint32_t;
+use wasmer_runtime::Table;
+use wasmer_runtime_core::types::{ElementType, TableDescriptor};
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_table_t;
+
+/// Creates a new Table for the given descriptor and initializes the given
+/// pointer to pointer to a pointer to the new Table.
+///
+/// The caller owns the object and should call `wasmer_table_destroy` to free it.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[no_mangle]
+pub unsafe extern "C" fn wasmer_table_new(
+    table: *mut *mut wasmer_table_t,
+    limits: wasmer_limits_t,
+) -> wasmer_result_t {
+    let max = if limits.max.has_some {
+        Some(limits.max.some)
+    } else {
+        None
+    };
+    let desc = TableDescriptor {
+        element: ElementType::Anyfunc,
+        minimum: limits.min,
+        maximum: max,
+    };
+    let result = Table::new(desc);
+    let new_table = match result {
+        Ok(table) => table,
+        Err(error) => {
+            update_last_error(error);
+            return wasmer_result_t::WASMER_ERROR;
+        }
+    };
+    *table = Box::into_raw(Box::new(new_table)) as *mut wasmer_table_t;
+    wasmer_result_t::WASMER_OK
+}
+
+/// Grows a Table by the given number of elements.
+///
+/// Returns `wasmer_result_t::WASMER_OK` upon success.
+///
+/// Returns `wasmer_result_t::WASMER_ERROR` upon failure. Use `wasmer_last_error_length`
+/// and `wasmer_last_error_message` to get an error message.
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_table_grow(
+    table: *mut wasmer_table_t,
+    delta: uint32_t,
+) -> wasmer_result_t {
+    let table = unsafe { &*(table as *mut Table) };
+    let delta_result = table.grow(delta);
+    match delta_result {
+        Ok(_) => wasmer_result_t::WASMER_OK,
+        Err(grow_error) => {
+            update_last_error(grow_error);
+            wasmer_result_t::WASMER_ERROR
+        }
+    }
+}
+
+/// Returns the current length of the given Table
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_table_length(table: *mut wasmer_table_t) -> uint32_t {
+    let table = unsafe { &*(table as *mut Table) };
+    table.size()
+}
+
+/// Frees memory for the given Table
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_table_destroy(table: *mut wasmer_table_t) {
+    if !table.is_null() {
+        unsafe { Box::from_raw(table as *mut Table) };
+    }
+}

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

@@ -0,0 +1,119 @@
+//! Wasm values.
+
+use libc::{int32_t, int64_t};
+use wasmer_runtime::Value;
+use wasmer_runtime_core::types::Type;
+
+#[allow(non_camel_case_types)]
+#[repr(u32)]
+#[derive(Clone)]
+pub enum wasmer_value_tag {
+    WASM_I32,
+    WASM_I64,
+    WASM_F32,
+    WASM_F64,
+}
+
+#[repr(C)]
+#[derive(Clone, Copy)]
+#[allow(non_snake_case)]
+pub union wasmer_value {
+    pub I32: int32_t,
+    pub I64: int64_t,
+    pub F32: f32,
+    pub F64: f64,
+}
+
+#[repr(C)]
+#[derive(Clone)]
+pub struct wasmer_value_t {
+    pub tag: wasmer_value_tag,
+    pub value: wasmer_value,
+}
+
+impl From<wasmer_value_t> for Value {
+    fn from(v: wasmer_value_t) -> Self {
+        unsafe {
+            #[allow(unreachable_patterns, non_snake_case)]
+            match v {
+                wasmer_value_t {
+                    tag: wasmer_value_tag::WASM_I32,
+                    value: wasmer_value { I32 },
+                } => Value::I32(I32),
+                wasmer_value_t {
+                    tag: wasmer_value_tag::WASM_I64,
+                    value: wasmer_value { I64 },
+                } => Value::I64(I64),
+                wasmer_value_t {
+                    tag: wasmer_value_tag::WASM_F32,
+                    value: wasmer_value { F32 },
+                } => Value::F32(F32),
+                wasmer_value_t {
+                    tag: wasmer_value_tag::WASM_F64,
+                    value: wasmer_value { F64 },
+                } => Value::F64(F64),
+                _ => panic!("not implemented"),
+            }
+        }
+    }
+}
+
+impl From<Value> for wasmer_value_t {
+    fn from(val: Value) -> Self {
+        match val {
+            Value::I32(x) => wasmer_value_t {
+                tag: wasmer_value_tag::WASM_I32,
+                value: wasmer_value { I32: x },
+            },
+            Value::I64(x) => wasmer_value_t {
+                tag: wasmer_value_tag::WASM_I64,
+                value: wasmer_value { I64: x },
+            },
+            Value::F32(x) => wasmer_value_t {
+                tag: wasmer_value_tag::WASM_F32,
+                value: wasmer_value { F32: x },
+            },
+            Value::F64(x) => wasmer_value_t {
+                tag: wasmer_value_tag::WASM_F64,
+                value: wasmer_value { F64: x },
+            },
+        }
+    }
+}
+
+impl From<Type> for wasmer_value_tag {
+    fn from(ty: Type) -> Self {
+        #[allow(unreachable_patterns)]
+        match ty {
+            Type::I32 => wasmer_value_tag::WASM_I32,
+            Type::I64 => wasmer_value_tag::WASM_I64,
+            Type::F32 => wasmer_value_tag::WASM_F32,
+            Type::F64 => wasmer_value_tag::WASM_F64,
+            _ => panic!("not implemented"),
+        }
+    }
+}
+
+impl From<wasmer_value_tag> for Type {
+    fn from(v: wasmer_value_tag) -> Self {
+        #[allow(unreachable_patterns)]
+        match v {
+            wasmer_value_tag::WASM_I32 => Type::I32,
+            wasmer_value_tag::WASM_I64 => Type::I64,
+            wasmer_value_tag::WASM_F32 => Type::F32,
+            wasmer_value_tag::WASM_F64 => Type::F64,
+            _ => panic!("not implemented"),
+        }
+    }
+}
+
+impl From<&wasmer_runtime::wasm::Type> for wasmer_value_tag {
+    fn from(ty: &Type) -> Self {
+        match *ty {
+            Type::I32 => wasmer_value_tag::WASM_I32,
+            Type::I64 => wasmer_value_tag::WASM_I64,
+            Type::F32 => wasmer_value_tag::WASM_F32,
+            Type::F64 => wasmer_value_tag::WASM_F64,
+        }
+    }
+}

lib/runtime-core/Cargo.toml

@@ -43,8 +43,8 @@ winapi = { version = "0.3", features = ["memoryapi"] }
 [dev-dependencies]
 field-offset = "0.1.1"
 
+[build-dependencies]
+blake2b_simd = "0.4.1"
+
 [features]
 debug = []
-
-[build-dependencies]
-blake2b_simd = "0.4.1"

lib/runtime-core/README.md

@@ -0,0 +1,31 @@
+<p align="center">
+  <a href="https://wasmer.io" target="_blank" rel="noopener noreferrer">
+    <img width="400" src="https://raw.githubusercontent.com/wasmerio/wasmer/master/logo.png" alt="Wasmer logo">
+  </a>
+</p>
+
+<p align="center">
+  <a href="https://circleci.com/gh/wasmerio/wasmer/">
+    <img src="https://img.shields.io/circleci/project/github/wasmerio/wasmer/master.svg" alt="Build Status">
+  </a>
+  <a href="https://github.com/wasmerio/wasmer/blob/master/LICENSE">
+    <img src="https://img.shields.io/github/license/wasmerio/wasmer.svg" alt="License">
+  </a>
+  <a href="https://spectrum.chat/wasmer">
+    <img src="https://withspectrum.github.io/badge/badge.svg" alt="Join the Wasmer Community">
+  </a>
+  <a href="https://crates.io/crates/wasmer-runtime-core">
+    <img src="https://img.shields.io/crates/d/wasmer-runtime-core.svg" alt="Number of downloads from crates.io">
+  </a>
+  <a href="https://docs.rs/wasmer-runtime-core">
+    <img src="https://docs.rs/wasmer-runtime-core/badge.svg" alt="Read our API documentation">
+  </a>
+</p>
+
+# Wasmer Runtime Core
+
+Wasmer is a standalone JIT WebAssembly runtime, aiming to be fully
+compatible with Emscripten, Rust and Go. [Learn
+more](https://github.com/wasmerio/wasmer).
+
+This crate represents the core of the runtime.

lib/runtime-core/src/error.rs

@@ -8,6 +8,7 @@ pub type LinkResult<T> = std::result::Result<T, Vec<LinkError>>;
 pub type RuntimeResult<T> = std::result::Result<T, RuntimeError>;
 pub type CallResult<T> = std::result::Result<T, CallError>;
 pub type ResolveResult<T> = std::result::Result<T, ResolveError>;
+pub type ParseResult<T> = std::result::Result<T, ParseError>;
 
 /// This is returned when the chosen compiler is unable to
 /// successfully compile the provided webassembly module into
@@ -445,3 +446,14 @@ impl Into<GrowError> for MemoryProtectionError {
         GrowError::CouldNotProtectMemory(self)
     }
 }
+
+#[derive(Debug)]
+pub enum ParseError {
+    BinaryReadError,
+}
+
+impl From<wasmparser::BinaryReaderError> for ParseError {
+    fn from(_: wasmparser::BinaryReaderError) -> Self {
+        ParseError::BinaryReadError
+    }
+}

lib/runtime-core/src/lib.rs

@@ -69,7 +69,11 @@ pub fn compile_with(
     let token = backend::Token::generate();
     compiler
         .compile(wasm, Default::default(), token)
-        .map(|inner| module::Module::new(Arc::new(inner)))
+        .map(|mut inner| {
+            let inner_info: &mut crate::module::ModuleInfo = &mut inner.info;
+            inner_info.import_custom_sections(wasm).unwrap();
+            module::Module::new(Arc::new(inner))
+        })
 }
 
 /// The same as `compile_with` but changes the compiler behavior

lib/runtime-core/src/module.rs

@@ -59,6 +59,26 @@ pub struct ModuleInfo {
 
     /// Symbol information from emscripten
     pub em_symbol_map: Option<HashMap<u32, String>>,
+
+    pub custom_sections: HashMap<String, Vec<u8>>,
+}
+
+impl ModuleInfo {
+    pub fn import_custom_sections(&mut self, wasm: &[u8]) -> crate::error::ParseResult<()> {
+        let mut parser = wasmparser::ModuleReader::new(wasm)?;
+        while !parser.eof() {
+            let section = parser.read()?;
+            if let wasmparser::SectionCode::Custom { name, kind: _ } = section.code {
+                let mut reader = section.get_binary_reader();
+                let len = reader.bytes_remaining();
+                let bytes = reader.read_bytes(len)?;
+                let data = bytes.to_vec();
+                let name = String::from_utf8_lossy(name).to_string();
+                self.custom_sections.insert(name, data);
+            }
+        }
+        Ok(())
+    }
 }
 
 /// A compiled WebAssembly module.

lib/runtime-core/src/vm.rs

@@ -547,7 +547,7 @@ mod vm_ctx_tests {
         use crate::backend::{
             sys::Memory, Backend, CacheGen, FuncResolver, ProtectedCaller, Token, UserTrapper,
         };
-        use crate::cache::{Error as CacheError, WasmHash};
+        use crate::cache::Error as CacheError;
         use crate::error::RuntimeResult;
         use crate::types::{FuncIndex, LocalFuncIndex, Value};
         use hashbrown::HashMap;
@@ -617,6 +617,8 @@ mod vm_ctx_tests {
                 name_table: StringTable::new(),
 
                 em_symbol_map: None,
+
+                custom_sections: HashMap::new(),
             },
         }
     }

lib/runtime/README.md

@@ -1,12 +1,41 @@
-# Wasmer-Runtime
+<p align="center">
+  <a href="https://wasmer.io" target="_blank" rel="noopener noreferrer">
+    <img width="400" src="https://raw.githubusercontent.com/wasmerio/wasmer/master/logo.png" alt="Wasmer logo">
+  </a>
+</p>
 
-Wasmer-runtime is a library that makes embedding WebAssembly
+<p align="center">
-in your application easy, efficient, and safe.
+  <a href="https://circleci.com/gh/wasmerio/wasmer/">
+    <img src="https://img.shields.io/circleci/project/github/wasmerio/wasmer/master.svg" alt="Build Status">
+  </a>
+  <a href="https://github.com/wasmerio/wasmer/blob/master/LICENSE">
+    <img src="https://img.shields.io/github/license/wasmerio/wasmer.svg" alt="License">
+  </a>
+  <a href="https://spectrum.chat/wasmer">
+    <img src="https://withspectrum.github.io/badge/badge.svg" alt="Join the Wasmer Community">
+  </a>
+  <a href="https://crates.io/crates/wasmer-runtime">
+    <img src="https://img.shields.io/crates/d/wasmer-runtime.svg" alt="Number of downloads from crates.io">
+  </a>
+  <a href="https://docs.rs/wasmer-runtime">
+    <img src="https://docs.rs/wasmer-runtime/badge.svg" alt="Read our API documentation">
+  </a>
+</p>
 
-# How to use Wasmer-Runtime
+# Wasmer Runtime
 
-The easiest way is to use the [`instantiate`] function to create an [`Instance`].
+Wasmer is a standalone JIT WebAssembly runtime, aiming to be fully
-Then you can use [`call`] or [`func`] and then [`call`][func.call] to call an exported function safely.
+compatible with Emscripten, Rust and Go. [Learn
+more](https://github.com/wasmerio/wasmer).
+
+This crate represents the high-level runtime API, making embedding
+WebAssembly in your application easy, efficient, and safe.
+
+## How to use Wasmer Runtime
+
+The easiest way is to use the [`instantiate`] function to create an
+[`Instance`]. Then you can use [`call`] or [`func`] and then
+[`call`][func.call] to call an exported function safely.
 
 [`instantiate`]: https://docs.rs/wasmer-runtime/*/wasmer_runtime/fn.instantiate.html
 [`Instance`]: https://docs.rs/wasmer-runtime/*/wasmer_runtime/struct.Instance.html
@@ -14,7 +43,7 @@ Then you can use [`call`] or [`func`] and then [`call`][func.call] to call an ex
 [`func`]: https://docs.rs/wasmer-runtime/*/wasmer_runtime/struct.Instance.html#method.func
 [func.call]: https://docs.rs/wasmer-runtime/*/wasmer_runtime/struct.Function.html#method.call
 
-## Here's an example:
+## Example
 
 Given this WebAssembly:
 
@@ -27,7 +56,7 @@ Given this WebAssembly:
     i32.add))
 ```
 
-compiled into wasm bytecode, we can call the exported "add_one" function:
+compiled into Wasm bytecode, we can call the exported `add_one` function:
 
 ```rust
 static WASM: &'static [u8] = &[
@@ -63,13 +92,14 @@ fn main() -> error::Result<()> {
 }
 ```
 
-# Additional Notes:
+## Additional Notes
 
-The `wasmer-runtime` is build to support compiler multiple backends.
+The `wasmer-runtime` crate is build to support multiple compiler
-Currently, we support the [Cranelift] compiler with the [`wasmer-clif-backend`] crate.
+backends.  Currently, we support the [Cranelift] compiler with the
+[`wasmer-clif-backend`] crate by default.
 
 You can specify the compiler you wish to use with the [`compile_with`] function.
 
 [Cranelift]: https://github.com/CraneStation/cranelift
 [`wasmer-clif-backend`]: https://crates.io/crates/wasmer-clif-backend
-[`compile_with`]: https://docs.rs/wasmer-runtime/*/wasmer_runtime/fn.compile_with.html
+[`compile_with`]: https://docs.rs/wasmer-runtime/*/wasmer_runtime/fn.compile_with.html

lib/spectests/README.md

@@ -0,0 +1,32 @@
+<p align="center">
+  <a href="https://wasmer.io" target="_blank" rel="noopener noreferrer">
+    <img width="400" src="https://raw.githubusercontent.com/wasmerio/wasmer/master/logo.png" alt="Wasmer logo">
+  </a>
+</p>
+
+<p align="center">
+  <a href="https://circleci.com/gh/wasmerio/wasmer/">
+    <img src="https://img.shields.io/circleci/project/github/wasmerio/wasmer/master.svg" alt="Build Status">
+  </a>
+  <a href="https://github.com/wasmerio/wasmer/blob/master/LICENSE">
+    <img src="https://img.shields.io/github/license/wasmerio/wasmer.svg" alt="License">
+  </a>
+  <a href="https://spectrum.chat/wasmer">
+    <img src="https://withspectrum.github.io/badge/badge.svg" alt="Join the Wasmer Community">
+  </a>
+  <a href="https://crates.io/crates/wasmer-spectests">
+    <img src="https://img.shields.io/crates/d/wasmer-spectests.svg" alt="Number of downloads from crates.io">
+  </a>
+  <a href="https://docs.rs/wasmer-spectests">
+    <img src="https://docs.rs/wasmer-spectests/badge.svg" alt="Read our API documentation">
+  </a>
+</p>
+
+# Wasmer Spectests
+
+Wasmer is a standalone JIT WebAssembly runtime, aiming to be fully
+compatible with Emscripten, Rust and Go. [Learn
+more](https://github.com/wasmerio/wasmer).
+
+This crate allows to test the Wasmer runtime against the official
+specification test suite.

lib/wasi/Cargo.toml

@@ -7,4 +7,9 @@ edition = "2018"
 [dependencies]
 wasmer-runtime-core = { path = "../runtime-core", version = "0.2.1" }
 libc = "0.2.50"
-rand = "0.6.5"
+rand = "0.6.5"
+# wasmer-runtime-abi = { path = "../runtime-abi" }
+hashbrown = "0.1.8"
+generational-arena = "0.2.2"
+zbox = "0.6.1"
+log = "0.4.6"

lib/wasi/src/lib.rs

@@ -1,9 +1,13 @@
+
+#[macro_use]
+extern crate log;
+
 mod ptr;
 mod state;
 mod syscalls;
 mod utils;
 
-use self::state::WasiState;
+use self::state::{WasiState, WasiFs};
 use self::syscalls::*;
 
 use std::ffi::c_void;
@@ -21,6 +25,7 @@ pub fn generate_import_object(args: Vec<Vec<u8>>, envs: Vec<Vec<u8>>) -> ImportO
         }
 
         let state = Box::new(WasiState {
+            fs: WasiFs::new().unwrap(),
             args: &args[..],
             envs: &envs[..],
         });

lib/wasi/src/state.rs

@@ -1,5 +1,182 @@
+// use wasmer_runtime_abi::vfs::{
+//     vfs::Vfs,
+//     file_like::{FileLike, Metadata};
+// };
+use std::{
+    cell::{Cell, RefCell},
+    ops::{Index, IndexMut},
+    rc::Rc,
+    time::SystemTime,
+};
+use generational_arena::{Arena, Index as Inode};
+use hashbrown::hash_map::{HashMap, Entry};
+use zbox::{
+    RepoOpener,
+    Repo,
+    File,
+    FileType,
+    OpenOptions,
+};
+use crate::syscalls::types::*;
+
+pub const MAX_SYMLINKS: usize = 100;
+
+pub struct InodeVal {
+    stat: __wasi_filestat_t,
+    is_preopened: bool,
+    name: String,
+    kind: Kind,
+}
+
+pub enum Kind {
+    File {
+        handle: File,
+    },
+    Dir {
+        handle: File,
+        /// The entries of a directory are lazily filled.
+        entries: Vec<Inode>,
+    },
+    Symlink {
+        forwarded: Inode,
+    },
+    Buffer {
+        buffer: Vec<u8>,
+    },
+}
+
+pub struct Fd {
+    rights: __wasi_rights_t,
+    flags: __wasi_fdflags_t,
+    offset: u64,
+    inode: Inode,
+}
+
+pub struct WasiFs {
+    repo: Repo,
+    name_map: HashMap<String, Inode>,
+    inodes: Arena<InodeVal>,
+    fd_map: HashMap<u32, Fd>,
+    next_fd: Cell<u32>,
+    inode_counter: Cell<u64>,
+}
+
+impl WasiFs {
+    pub fn new() -> Result<Self, String> {
+        Ok(Self {
+            repo: RepoOpener::new().create(true).open("mem://📂", "very unsafe pwd").map_err(|e| e.to_string())?,
+            name_map: HashMap::new(),
+            inodes: Arena::new(),
+            fd_map: HashMap::new(),
+            next_fd: Cell::new(3),
+            inode_counter: Cell::new(1000),
+        })
+    }
+
+    fn get_inode(&mut self, path: &str) -> Option<Inode> {
+        Some(match self.name_map.entry(path.to_string()) {
+            Entry::Occupied(o) => *o.get(),
+            Entry::Vacant(v) => {
+                let file = if let Ok(file) = OpenOptions::new().read(true).write(true).create(false).open(&mut self.repo, path) {
+                    file
+                } else {
+                    return None;
+                };
+                
+                let metadata = file.metadata().unwrap();
+                let inode_index = {
+                    let index = self.inode_counter.get();
+                    self.inode_counter.replace(index + 1)
+                };
+
+                let systime_to_nanos = |systime: SystemTime| {
+                    let duration = systime.duration_since(SystemTime::UNIX_EPOCH).expect("should always be after unix epoch");
+                    duration.as_nanos() as u64
+                };
+
+                let inode = self.inodes.insert(InodeVal {
+                    stat: __wasi_filestat_t {
+                        st_dev: 0,
+                        st_ino: inode_index,
+                        st_filetype: match metadata.file_type() {
+                            FileType::File => __WASI_FILETYPE_REGULAR_FILE,
+                            FileType::Dir => __WASI_FILETYPE_DIRECTORY,
+                        },
+                        st_nlink: 0,
+                        st_size: metadata.len() as u64,
+                        st_atim: systime_to_nanos(SystemTime::now()),
+                        st_mtim: systime_to_nanos(metadata.modified()),
+                        st_ctim: systime_to_nanos(metadata.created()),
+                    },
+                    is_preopened: false,
+                    name: path.to_string(),
+                    kind: match metadata.file_type() {
+                        FileType::File => Kind::File {
+                            handle: file,
+                        },
+                        FileType::Dir => Kind::Dir {
+                            handle: file,
+                            entries: Vec::new(),
+                        },
+                    },
+                });
+                v.insert(inode);
+                inode
+            },
+        })
+    }
+
+    fn filestat_inode(&self, inode: Inode, flags: __wasi_lookupflags_t) -> Result<__wasi_filestat_t, __wasi_errno_t> {
+        let inode_val = &self.inodes[inode];
+        if let (true, Kind::Symlink { mut forwarded })  = (flags & __WASI_LOOKUP_SYMLINK_FOLLOW != 0, &inode_val.kind) {
+            // Time to follow the symlink.
+            let mut counter = 0;
+
+            while counter <= MAX_SYMLINKS {
+                let inode_val = &self.inodes[forwarded];
+                if let &Kind::Symlink { forwarded: new_forwarded } = &inode_val.kind {
+                    counter += 1;
+                    forwarded = new_forwarded;
+                } else {
+                    return Ok(inode_val.stat);
+                }
+            }
+
+            Err(__WASI_EMLINK)
+        } else {
+            Ok(inode_val.stat)
+        }
+    }
+
+    pub fn filestat_path(
+        &mut self,
+        preopened_fd: __wasi_fd_t,
+        flags: __wasi_lookupflags_t,
+        path: &str,
+    ) -> Result<__wasi_filestat_t, __wasi_errno_t> {
+        warn!("Should use preopned_fd: {}", preopened_fd);
+        let inode = if let Some(inode) = self.get_inode(path) {
+            inode
+        } else {
+            return Err(__WASI_EINVAL);
+        };
+
+        self.filestat_inode(inode, flags)
+    }
+
+    pub fn filestat_fd(&self, fd: __wasi_fd_t) -> Result<__wasi_filestat_t, __wasi_errno_t> {
+        let fd = if let Some(fd) = self.fd_map.get(&fd) {
+            fd
+        } else {
+            return Err(__WASI_EBADF);
+        };
+
+        self.filestat_inode(fd.inode, 0)
+    }
+}
+
 pub struct WasiState<'a> {
-    // vfs: Vfs,
+    pub fs: WasiFs,
     pub args: &'a [Vec<u8>],
     pub envs: &'a [Vec<u8>],
 }

lib/wasi/src/syscalls/mod.rs

@@ -226,7 +226,20 @@ pub fn fd_fdstat_get(
     fd: __wasi_fd_t,
     buf: WasmPtr<__wasi_fdstat_t>,
 ) -> __wasi_errno_t {
-    unimplemented!()
+    let mut state = get_wasi_state(ctx);
+    let memory = ctx.memory(0);
+
+    let stat = match state.fs.filestat_fd(fd) {
+        Ok(stat) => stat,
+        Err(errno) => return errno,
+    };
+
+    if let Some(buf) = buf.deref(memory) {
+        buf.set(stat);
+        __WASI_ESUCCESS
+    } else {
+        __WASI_EFAULT
+    }
 }
 pub fn fd_fdstat_set_flags(
     ctx: &mut Ctx,

lib/win-exception-handler/README.md

@@ -0,0 +1,31 @@
+<p align="center">
+  <a href="https://wasmer.io" target="_blank" rel="noopener noreferrer">
+    <img width="400" src="https://raw.githubusercontent.com/wasmerio/wasmer/master/logo.png" alt="Wasmer logo">
+  </a>
+</p>
+
+<p align="center">
+  <a href="https://circleci.com/gh/wasmerio/wasmer/">
+    <img src="https://img.shields.io/circleci/project/github/wasmerio/wasmer/master.svg" alt="Build Status">
+  </a>
+  <a href="https://github.com/wasmerio/wasmer/blob/master/LICENSE">
+    <img src="https://img.shields.io/github/license/wasmerio/wasmer.svg" alt="License">
+  </a>
+  <a href="https://spectrum.chat/wasmer">
+    <img src="https://withspectrum.github.io/badge/badge.svg" alt="Join the Wasmer Community">
+  </a>
+  <a href="https://crates.io/crates/wasmer-win-exception-handler">
+    <img src="https://img.shields.io/crates/d/wasmer-win-exception-handler.svg" alt="Number of downloads from crates.io">
+  </a>
+  <a href="https://docs.rs/wasmer-win-exception-handler">
+    <img src="https://docs.rs/wasmer-win-exception-handler/badge.svg" alt="Read our API documentation">
+  </a>
+</p>
+
+# Wasmer Windows Exception Handler
+
+Wasmer is a standalone JIT WebAssembly runtime, aiming to be fully
+compatible with Emscripten, Rust and Go. [Learn
+more](https://github.com/wasmerio/wasmer).
+
+This crate provides an API for exception handling on Windows.

scripts/install_lib_sodium.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+curl -O https://download.libsodium.org/libsodium/releases/libsodium-1.0.17.tar.gz
+tar xf libsodium-1.0.17.tar.gz
+cd libsodium-1.0.17/
+./configure
+make && make check
+sudo make install