Add more fuzz targets

fuzz/Cargo.toml

@@ -19,7 +19,19 @@ features = ["multi_value", "sign_ext"]
 path = "../wasm"
 
 [[bin]]
-name = "translator"
+name = "full_translate"
-path = "fuzz_targets/translator.rs"
+path = "fuzz_targets/full_translate.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "just_writer"
+path = "fuzz_targets/just_writer.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "just_transformer"
+path = "fuzz_targets/just_transformer.rs"
 test = false
 doc = false

fuzz/fuzz_targets/just_transformer.rs

@@ -0,0 +1,24 @@
+#![no_main]
+
+use parity_wasm::elements::Module as WasmModule;
+use wasm_smith::Module as SmModule;
+
+use wasm::backend::{ast::transformer::Transformer, translator::arity::List};
+
+fn fuzz_transformer(wasm: &WasmModule) {
+	let arity = List::new(wasm);
+
+	for i in 0..arity.in_arity.len() {
+		let _ = Transformer::new(wasm, &arity).consume(i);
+	}
+}
+
+libfuzzer_sys::fuzz_target!(|module: SmModule| {
+	let data = module.to_bytes();
+	let wasm = match parity_wasm::deserialize_buffer(&data) {
+		Ok(v) => v,
+		Err(_) => return,
+	};
+
+	fuzz_transformer(&wasm);
+});

fuzz/fuzz_targets/just_writer.rs

@@ -0,0 +1,35 @@
+#![no_main]
+
+use std::io::Result;
+
+use parity_wasm::elements::Module as WasmModule;
+use wasm_smith::Module as SmModule;
+
+use wasm::backend::{
+	ast::transformer::Transformer,
+	edition::{data::Edition, luajit::LuaJIT},
+	translator::{arity::List, writer::Data},
+};
+
+fn fuzz_writer(wasm: &WasmModule, ed: &dyn Edition) -> Result<()> {
+	let mut sink = std::io::sink();
+	let arity = List::new(wasm);
+
+	for i in 0..arity.in_arity.len() {
+		let func = Transformer::new(wasm, &arity).consume(i);
+
+		func.output(&mut Data::new(ed), &mut sink)?;
+	}
+
+	Ok(())
+}
+
+libfuzzer_sys::fuzz_target!(|module: SmModule| {
+	let data = module.to_bytes();
+	let wasm = match parity_wasm::deserialize_buffer(&data) {
+		Ok(v) => v,
+		Err(_) => return,
+	};
+
+	fuzz_writer(&wasm, &LuaJIT).expect("LuaJIT should succeed");
+});

wasm/src/backend/mod.rs

@@ -1,4 +1,4 @@
-mod ast;
+pub mod ast;
 pub mod edition;
 pub mod translator;
 mod visitor;

wasm/src/backend/translator/mod.rs

@@ -1,3 +1,3 @@
 pub mod arity;
 pub mod data;
-mod writer;
+pub mod writer;