Add WASI support to C API

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## **[Unreleased]**
 
 - [#883](https://github.com/wasmerio/wasmer/pull/883) Allow floating point operations to have arbitrary inputs, even including SNaNs.
+- [#856](https://github.com/wasmerio/wasmer/pull/856) Expose methods in the runtime C API to get a WASI import object
 
 ## 0.9.0 - 2019-10-23
 

Makefile

@@ -105,6 +105,8 @@ capi:
 test-capi: capi
 	cargo test -p wasmer-runtime-c-api --release
 
+capi-test: test-capi
+
 test-rest:
 	cargo test --release --all --exclude wasmer-runtime-c-api --exclude wasmer-emscripten --exclude wasmer-spectests --exclude wasmer-wasi --exclude wasmer-middleware-common --exclude wasmer-middleware-common-tests --exclude wasmer-singlepass-backend --exclude wasmer-clif-backend --exclude wasmer-llvm-backend --exclude wasmer-wasi-tests --exclude wasmer-emscripten-tests
 

lib/runtime-c-api/Cargo.toml

@@ -24,12 +24,19 @@ default-features = false
 path = "../runtime-core"
 version = "0.9.0"
 
+[dependencies.wasmer-wasi]
+default-features = false
+path = "../wasi"
+version = "0.9.0"
+optional = true
+
 [features]
-default = ["cranelift-backend"]
+default = ["cranelift-backend", "wasi"]
 debug = ["wasmer-runtime/debug"]
 cranelift-backend = ["wasmer-runtime/cranelift", "wasmer-runtime/default-backend-cranelift"]
 llvm-backend = ["wasmer-runtime/llvm", "wasmer-runtime/default-backend-llvm"]
 singlepass-backend = ["wasmer-runtime/singlepass", "wasmer-runtime/default-backend-singlepass"]
+wasi = ["wasmer-wasi"]
 
 [build-dependencies]
 cbindgen = "0.9"

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

@@ -85,12 +85,41 @@ pub union wasmer_import_export_value {
 /// List of export/import kinds.
 #[allow(non_camel_case_types)]
 #[repr(u32)]
-#[derive(Clone)]
+#[derive(Clone, PartialEq, Eq)]
+// ================
+// !    DANGER    !
+// ================
+// Do not modify these values without updating the `TryFrom` implementation below
 pub enum wasmer_import_export_kind {
-    WASM_FUNCTION,
-    WASM_GLOBAL,
-    WASM_MEMORY,
-    WASM_TABLE,
+    WASM_FUNCTION = 0,
+    WASM_GLOBAL = 1,
+    WASM_MEMORY = 2,
+    WASM_TABLE = 3,
+}
+
+impl wasmer_import_export_kind {
+    pub fn to_str(&self) -> &'static str {
+        match self {
+            Self::WASM_FUNCTION => "function",
+            Self::WASM_GLOBAL => "global",
+            Self::WASM_MEMORY => "memory",
+            Self::WASM_TABLE => "table",
+        }
+    }
+}
+
+impl std::convert::TryFrom<u32> for wasmer_import_export_kind {
+    type Error = ();
+
+    fn try_from(value: u32) -> Result<Self, Self::Error> {
+        Ok(match value {
+            0 => Self::WASM_FUNCTION,
+            1 => Self::WASM_GLOBAL,
+            2 => Self::WASM_MEMORY,
+            3 => Self::WASM_TABLE,
+            _ => return Err(()),
+        })
+    }
 }
 
 /// Gets export descriptors for the given module