fix: wat feature flag, ensure wasm target compiles

Signed-off-by: Henry Gressmann <mail@henrygressmann.de>

.gitignore

@@ -1,2 +1,3 @@
 /target
-notes.md
+notes.md
+examples/tinywasm.wat

README.md

@@ -11,7 +11,8 @@
 
 # 🎯 Goals
 
-* Interpreted Runtime
+* Interpreted Runtime (no JIT)
+* Self-hosted (can run itself compiled to WebAssembly)
 * No unsafe code
 * Works on `no_std` (with `alloc` the feature and nightly compiler)
 * Fully support WebAssembly MVP (1.0)

crates/cli/Cargo.toml

@@ -18,5 +18,5 @@ pretty_env_logger="0.5"
 wast={version="69.0", optional=true}
 
 [features]
-default=["wast"]
-wast=["dep:wast"]
+default=["wat"]
+wat=["dep:wast"]

crates/cli/bin.rs

@@ -5,6 +5,8 @@ use color_eyre::eyre::Result;
 use log::info;
 use tinywasm::{self, Module, WasmValue};
 mod util;
+
+#[cfg(feature = "wat")]
 mod wat;
 
 #[derive(FromArgs)]
@@ -75,11 +77,18 @@ fn main() -> Result<()> {
         TinyWasmSubcommand::Run(Run { wasm_file, engine }) => {
             let path = cwd.join(wasm_file.clone());
             let module = match wasm_file.ends_with(".wat") {
+                #[cfg(feature = "wat")]
                 true => {
                     let wat = std::fs::read_to_string(path)?;
                     let wasm = wat::wat2wasm(&wat);
                     tinywasm::Module::parse_bytes(&wasm)?
                 }
+                #[cfg(not(feature = "wat"))]
+                true => {
+                    return Err(color_eyre::eyre::eyre!(
+                        "wat support is not enabled, please enable it with --features wat"
+                    ))
+                }
                 false => tinywasm::Module::parse_file(path)?,
             };
 

crates/tinywasm/Cargo.toml

@@ -4,7 +4,9 @@ version="0.0.0"
 edition="2021"
 
 [lib]
+name="tinywasm"
 path="src/lib.rs"
+crate-type=["cdylib", "rlib"]
 
 [dependencies]
 log="0.4.20"