initial

.gitignore

@@ -0,0 +1 @@
+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "log"
+version = "0.4.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "wat2wasm"
+version = "0.1.0"
+dependencies = [
+ "log",
+]

Cargo.toml

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+[package]
+name = "wat2wasm"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+log = "0.4.17"

assets/example.wasm.txt

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+00000000: 0061 736d
+00000004: 0100 0000
+00000008: 0105 0160
+0000000c: 0001 7f03
+00000010: 0201 0007
+00000014: 0801 046d
+00000018: 6169 6e00
+0000001c: 000a 0701
+00000020: 0500 412a
+00000024: 0f0b

assets/example.wat

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+(module
+  (func (export "main") 
+        (result i32)
+    i32.const 42 
+    return))

src/main.rs

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+#![warn(missing_docs)]
+//! A compliant wat compiler
+//!
+//! # Refs
+//! https://webassembly.github.io/spec/core/
+//! https://blog.ttulka.com/learning-webassembly-2-wasm-binary-format
+
+use log::*;
+
+pub const WASM_MAGIC: &[u8; 4] = b"\0asm";
+pub const WASM_VERSION: &[u8; 4] = b"1000";
+#[non_exhaustive]
+pub enum WasmTypes {
+    /// https://webassembly.github.io/spec/core/syntax/types.html#number-types
+    Number32(i32),
+    Number64(i64),
+    Float32(f32),
+    Float64(f64),
+
+    /// https://webassembly.github.io/spec/core/syntax/types.html#vector-types
+    Vector128,
+}
+
+#[non_exhaustive]
+pub struct FunctionSignature {
+    pub parameters: Vec<WasmTypes>,
+    pub return_count: Vec<WasmTypes>,
+}
+
+pub enum SectionType {
+    Type,
+    Function(FunctionSignature),
+    Export,
+}
+
+pub struct Section {
+    stype: SectionType,
+    size: u64,
+}
+
+pub struct Program {
+    pub sections: Vec<Section>,
+}
+
+impl Program {
+    pub fn to_binary(&self) -> Vec<u8> {
+        let mut bin: Vec<u8> = vec![];
+        for byte in WASM_MAGIC {
+            bin.push(*byte);
+        }
+        trace!("Added WASM magic value: {:?}", WASM_MAGIC);
+
+        for byte in WASM_VERSION {
+            bin.push(*byte);
+        }
+        trace!("Added WASM version value: {:?}", WASM_VERSION);
+
+        bin
+    }
+}
+
+fn main() {
+    let program = Program {
+        // NOTE: If wasm ever gets a v2 this should probably be handled properly
+        sections: vec![],
+    };
+
+    let pbin = program.to_binary();
+    println!("{:?}", pbin);
+}