SeaOfNodes chapter08: basic fuzzer on random strings

fuzz/.gitignore

@@ -0,0 +1,4 @@
+target
+corpus
+artifacts
+coverage

fuzz/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "simple-rust-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.simple-rust]
+path = ".."
+
+[[bin]]
+name = "basic"
+path = "fuzz_targets/basic.rs"
+test = false
+doc = false
+bench = false

fuzz/fuzz_targets/basic.rs

@@ -0,0 +1,14 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use simple_rust::datastructures::arena::Arena;
+use simple_rust::sea_of_nodes::parser::Parser;
+use simple_rust::sea_of_nodes::types::Types;
+
+fuzz_target!(|source: &str| {
+    let arena = Arena::new();
+    let mut types = Types::new(&arena);
+    let mut parser = Parser::new(source, &mut types);
+    parser.disable_show_graph_println = true;
+    let _ = parser.parse();
+});

src/sea_of_nodes/parser.rs

@@ -25,6 +25,7 @@ pub struct Parser<'s, 'mt, 't> {
 
     continue_scope: Option<NodeId>,
     break_scope: Option<NodeId>,
+    pub disable_show_graph_println: bool,
 }
 
 type ParseErr = String;
@@ -68,6 +69,7 @@ impl<'s, 'mt, 't> Parser<'s, 'mt, 't> {
             x_scopes: vec![],
             continue_scope: None,
             break_scope: None,
+            disable_show_graph_println: false,
         }
     }
 
@@ -376,9 +378,11 @@ impl<'s, 'mt, 't> Parser<'s, 'mt, 't> {
     /// Dumps out the node graph
     pub fn show_graph(&mut self) {
         let dot = graph_visualizer::generate_dot_output(self, false).unwrap();
-        println!("{dot}");
-        // uncomment to open in browser:
-        // graph_visualizer::run_graphviz_and_chromium(dot);
+        if !self.disable_show_graph_println {
+            println!("{dot}");
+            // uncomment to open in browser:
+            // graph_visualizer::run_graphviz_and_chromium(dot);
+        }
     }
 
     pub fn print(&mut self, node: NodeId) -> String {