feat(c-api) Add wat2wasm to the wasm-c-api module

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Changelog
 
 ## **[Unreleased]**
+- [#1635](https://github.com/wasmerio/wasmer/pull/1635) Implement `wat2wasm` in the Wasm C API.
+- [#1636](https://github.com/wasmerio/wasmer/pull/1636) Implement `wasm_module_validate` in the Wasm C API.
 - [#1671](https://github.com/wasmerio/wasmer/pull/1671) Fix probestack firing inappropriately, and sometimes over/under allocating stack.
 - [#1657](https://github.com/wasmerio/wasmer/pull/1657) Implement `wasm_trap_t` and `wasm_frame_t` for Wasm C API; add examples in Rust and C of exiting early with a host function.
 - [#1645](https://github.com/wasmerio/wasmer/pull/1645) Move the install script to https://github.com/wasmerio/wasmer-install

Makefile

@@ -76,15 +76,15 @@ build-capi: build-capi-cranelift
 
 build-capi-singlepass:
 	cargo build --manifest-path lib/c-api/Cargo.toml --release \
-		--no-default-features --features jit,singlepass,wasi
+		--no-default-features --features wat,jit,singlepass,wasi
 
 build-capi-cranelift:
 	cargo build --manifest-path lib/c-api/Cargo.toml --release \
-		--no-default-features --features jit,cranelift,wasi
+		--no-default-features --features wat,jit,cranelift,wasi
 
 build-capi-llvm:
 	cargo build --manifest-path lib/c-api/Cargo.toml --release \
-		--no-default-features --features jit,llvm,wasi
+		--no-default-features --features wat,jit,llvm,wasi
 
 
 ###########
@@ -112,15 +112,15 @@ test-packages:
 
 test-capi-singlepass: build-capi-singlepass
 	cargo test --manifest-path lib/c-api/Cargo.toml --release \
-		--no-default-features --features jit,singlepass,wasi -- --nocapture
+		--no-default-features --features wat,jit,singlepass,wasi -- --nocapture
 
 test-capi-cranelift: build-capi-cranelift
 	cargo test --manifest-path lib/c-api/Cargo.toml --release \
-		--no-default-features --features jit,cranelift,wasi -- --nocapture
+		--no-default-features --features wat,jit,cranelift,wasi -- --nocapture
 
 test-capi-llvm: build-capi-llvm
 	cargo test --manifest-path lib/c-api/Cargo.toml --release \
-		--no-default-features --features jit,llvm,wasi -- --nocapture
+		--no-default-features --features wat,jit,llvm,wasi -- --nocapture
 
 test-capi: test-capi-singlepass test-capi-cranelift test-capi-llvm
 

lib/c-api/Cargo.toml

@@ -40,9 +40,11 @@ paste = "0.1"
 
 [features]
 default = [
+    "wat",
     "cranelift",
     "wasi",
 ]
+wat = ["wasmer/wat"]
 wasi = ["wasmer-wasi", "typetag", "serde"]
 engine = []
 jit = [

lib/c-api/build.rs

@@ -374,4 +374,5 @@ fn exclude_items_from_wasm_c_api(builder: Builder) -> Builder {
         .exclude_item("wasi_get_start_function")
         .exclude_item("wasi_get_wasi_version")
         .exclude_item("wasi_version_t")
+        .exclude_item("wat2wasm")
 }

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

@@ -29,3 +29,5 @@ pub mod value;
 
 #[cfg(feature = "wasi")]
 pub mod wasi;
+
+pub mod wat;

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

@@ -0,0 +1,28 @@
+use super::types::wasm_byte_vec_t;
+
+/// Parses in-memory bytes as either the WAT format, or a binary Wasm
+/// module. This is wasmer-specific.
+///
+/// In case of failure, `wat2wasm` returns `NULL`.
+#[cfg(feature = "wat")]
+#[no_mangle]
+pub unsafe extern "C" fn wat2wasm(wat: &wasm_byte_vec_t) -> Option<Box<wasm_byte_vec_t>> {
+    let wat: &[u8] = wat.into_slice()?;
+
+    let result = match wasmer::wat2wasm(wat) {
+        Ok(result) => result,
+        Err(error) => {
+            crate::error::update_last_error(error);
+
+            return None;
+        }
+    };
+
+    let mut result: Vec<u8> = result.into_owned();
+    result.shrink_to_fit();
+
+    Some(Box::new(wasm_byte_vec_t {
+        size: result.len(),
+        data: result.as_mut_ptr(),
+    }))
+}

lib/c-api/wasmer_wasm.h

@@ -177,4 +177,12 @@ int wasmer_last_error_length(void);
  */
 int wasmer_last_error_message(char *buffer, int length);
 
+/**
+ * Parses in-memory bytes as either the WAT format, or a binary Wasm
+ * module. This is wasmer-specific.
+ *
+ * In case of failure, `wat2wasm` returns `NULL`.
+ */
+wasm_byte_vec_t *wat2wasm(const wasm_byte_vec_t *wat);
+
 #endif /* WASMER_WASM_H */