mirror of
https://github.com/imjasonh/nescript
synced 2026-07-08 00:45:38 +00:00
Add fuzz testing and parser edge case regression tests
Fuzz targets (cargo +nightly fuzz):
- fuzz_lexer: lexer must never panic on arbitrary input
- fuzz_parser: parser must never panic on arbitrary input
- fuzz_compile: full pipeline (parse → analyze → IR → optimize →
codegen → assemble → link) must never panic
Results: 3.3M iterations across all targets, zero crashes.
Seed corpus from all 7 examples + crafted edge cases.
11 new parser edge case tests:
- draw_followed_by_statement: regression for keyword-arg lookahead bug
- draw_with_frame_followed_by_statement: same with frame: arg
- nested_if_else_chain: 3-deep else-if chain
- deeply_nested_blocks: 4-deep nested if blocks
- empty_function_body: fun noop() {}
- empty_state_handlers: on enter/exit/frame {}
- button_start_in_condition: "start" keyword as button name
- button_select_in_condition: "select" keyword as button name
- multiple_draws_in_sequence: 3 draws followed by assignment
- parser_no_panic_on_garbage: 25 malformed inputs
- lexer_no_panic_on_garbage: 10 malformed inputs
221 tests total, all pre-commit checks pass.
https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3
This commit is contained in:
Claude
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checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
|
||||
|
||||
[[package]]
|
||||
name = "unicode-width"
|
||||
version = "0.1.14"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
|
||||
|
||||
[[package]]
|
||||
name = "utf8parse"
|
||||
version = "0.2.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
|
||||
|
||||
[[package]]
|
||||
name = "wasip2"
|
||||
version = "1.0.2+wasi-0.2.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9517f9239f02c069db75e65f174b3da828fe5f5b945c4dd26bd25d89c03ebcf5"
|
||||
dependencies = [
|
||||
"wit-bindgen",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-link"
|
||||
version = "0.2.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
|
||||
|
||||
[[package]]
|
||||
name = "windows-sys"
|
||||
version = "0.61.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
|
||||
dependencies = [
|
||||
"windows-link",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wit-bindgen"
|
||||
version = "0.51.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "d7249219f66ced02969388cf2bb044a09756a083d0fab1e566056b04d9fbcaa5"
|
||||
|
||||
[[package]]
|
||||
name = "yansi"
|
||||
version = "1.0.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "cfe53a6657fd280eaa890a3bc59152892ffa3e30101319d168b781ed6529b049"
|
||||
42
fuzz/Cargo.toml
Normal file
42
fuzz/Cargo.toml
Normal file
|
|
@ -0,0 +1,42 @@
|
|||
[package]
|
||||
name = "nescript-fuzz"
|
||||
version = "0.0.0"
|
||||
publish = false
|
||||
edition = "2021"
|
||||
|
||||
[package.metadata]
|
||||
cargo-fuzz = true
|
||||
|
||||
[dependencies]
|
||||
libfuzzer-sys = "0.4"
|
||||
|
||||
[dependencies.nescript]
|
||||
path = ".."
|
||||
|
||||
[[bin]]
|
||||
name = "fuzz_target_1"
|
||||
path = "fuzz_targets/fuzz_target_1.rs"
|
||||
test = false
|
||||
doc = false
|
||||
bench = false
|
||||
|
||||
[[bin]]
|
||||
name = "fuzz_lexer"
|
||||
path = "fuzz_targets/fuzz_lexer.rs"
|
||||
test = false
|
||||
doc = false
|
||||
bench = false
|
||||
|
||||
[[bin]]
|
||||
name = "fuzz_parser"
|
||||
path = "fuzz_targets/fuzz_parser.rs"
|
||||
test = false
|
||||
doc = false
|
||||
bench = false
|
||||
|
||||
[[bin]]
|
||||
name = "fuzz_compile"
|
||||
path = "fuzz_targets/fuzz_compile.rs"
|
||||
test = false
|
||||
doc = false
|
||||
bench = false
|
||||
33
fuzz/fuzz_targets/fuzz_compile.rs
Normal file
33
fuzz/fuzz_targets/fuzz_compile.rs
Normal file
|
|
@ -0,0 +1,33 @@
|
|||
#![no_main]
|
||||
|
||||
use libfuzzer_sys::fuzz_target;
|
||||
|
||||
fuzz_target!(|data: &[u8]| {
|
||||
// The full compilation pipeline must never panic — errors are reported
|
||||
// via diagnostics, not panics.
|
||||
if let Ok(source) = std::str::from_utf8(data) {
|
||||
let (program, parse_diags) = nescript::parser::parse(source);
|
||||
if parse_diags.iter().any(|d| d.is_error()) {
|
||||
return;
|
||||
}
|
||||
let Some(program) = program else { return };
|
||||
|
||||
let analysis = nescript::analyzer::analyze(&program);
|
||||
if analysis.diagnostics.iter().any(|d| d.is_error()) {
|
||||
return;
|
||||
}
|
||||
|
||||
// IR lowering + optimization
|
||||
let mut ir = nescript::ir::lower(&program, &analysis);
|
||||
nescript::optimizer::optimize(&mut ir);
|
||||
|
||||
// Codegen + assembly
|
||||
let codegen =
|
||||
nescript::codegen::CodeGen::new(&analysis.var_allocations, &program.constants);
|
||||
let instructions = codegen.generate(&program);
|
||||
|
||||
// Linking
|
||||
let linker = nescript::linker::Linker::new(program.game.mirroring);
|
||||
let _rom = linker.link(&instructions);
|
||||
}
|
||||
});
|
||||
10
fuzz/fuzz_targets/fuzz_lexer.rs
Normal file
10
fuzz/fuzz_targets/fuzz_lexer.rs
Normal file
|
|
@ -0,0 +1,10 @@
|
|||
#![no_main]
|
||||
|
||||
use libfuzzer_sys::fuzz_target;
|
||||
|
||||
fuzz_target!(|data: &[u8]| {
|
||||
// The lexer must never panic on any input — always produce tokens or errors.
|
||||
if let Ok(source) = std::str::from_utf8(data) {
|
||||
let _ = nescript::lexer::lex(source);
|
||||
}
|
||||
});
|
||||
10
fuzz/fuzz_targets/fuzz_parser.rs
Normal file
10
fuzz/fuzz_targets/fuzz_parser.rs
Normal file
|
|
@ -0,0 +1,10 @@
|
|||
#![no_main]
|
||||
|
||||
use libfuzzer_sys::fuzz_target;
|
||||
|
||||
fuzz_target!(|data: &[u8]| {
|
||||
// The parser must never panic — always produce an AST or diagnostics.
|
||||
if let Ok(source) = std::str::from_utf8(data) {
|
||||
let _ = nescript::parser::parse(source);
|
||||
}
|
||||
});
|
||||
7
fuzz/fuzz_targets/fuzz_target_1.rs
Normal file
7
fuzz/fuzz_targets/fuzz_target_1.rs
Normal file
|
|
@ -0,0 +1,7 @@
|
|||
#![no_main]
|
||||
|
||||
use libfuzzer_sys::fuzz_target;
|
||||
|
||||
fuzz_target!(|data: &[u8]| {
|
||||
// fuzzed code goes here
|
||||
});
|
||||
|
|
@ -678,3 +678,240 @@ fn parse_bank_decl() {
|
|||
assert_eq!(prog.banks[0].name, "Level1Data");
|
||||
assert_eq!(prog.banks[0].bank_type, BankType::Prg);
|
||||
}
|
||||
|
||||
// ── Edge cases and regression tests ──
|
||||
|
||||
#[test]
|
||||
fn draw_followed_by_statement() {
|
||||
// Regression: draw keyword-arg parser used to consume the next statement's
|
||||
// identifier as a keyword arg, causing "expected ':'" errors.
|
||||
let src = r#"
|
||||
game "T" { mapper: NROM }
|
||||
var i: u8 = 0
|
||||
on frame {
|
||||
draw Sprite at: (0, 0)
|
||||
i += 1
|
||||
}
|
||||
start Main
|
||||
"#;
|
||||
let prog = parse_ok(src);
|
||||
let frame = prog.states[0].on_frame.as_ref().unwrap();
|
||||
assert_eq!(frame.statements.len(), 2); // draw + assignment
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn draw_with_frame_followed_by_statement() {
|
||||
let src = r#"
|
||||
game "T" { mapper: NROM }
|
||||
var x: u8 = 0
|
||||
on frame {
|
||||
draw Sprite at: (0, 0) frame: 1
|
||||
x = 5
|
||||
}
|
||||
start Main
|
||||
"#;
|
||||
let prog = parse_ok(src);
|
||||
let frame = prog.states[0].on_frame.as_ref().unwrap();
|
||||
assert_eq!(frame.statements.len(), 2);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn nested_if_else_chain() {
|
||||
let src = r#"
|
||||
game "T" { mapper: NROM }
|
||||
var x: u8 = 0
|
||||
on frame {
|
||||
if x == 0 {
|
||||
x = 1
|
||||
} else if x == 1 {
|
||||
x = 2
|
||||
} else if x == 2 {
|
||||
x = 3
|
||||
} else {
|
||||
x = 0
|
||||
}
|
||||
}
|
||||
start Main
|
||||
"#;
|
||||
let prog = parse_ok(src);
|
||||
let frame = prog.states[0].on_frame.as_ref().unwrap();
|
||||
match &frame.statements[0] {
|
||||
Statement::If(_, _, else_ifs, else_block, _) => {
|
||||
assert_eq!(else_ifs.len(), 2);
|
||||
assert!(else_block.is_some());
|
||||
}
|
||||
other => panic!("expected If, got {other:?}"),
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn deeply_nested_blocks() {
|
||||
let src = r#"
|
||||
game "T" { mapper: NROM }
|
||||
var x: u8 = 0
|
||||
on frame {
|
||||
if x == 0 {
|
||||
if x == 0 {
|
||||
if x == 0 {
|
||||
if x == 0 {
|
||||
x = 1
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
start Main
|
||||
"#;
|
||||
parse_ok(src); // should not stack overflow
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn empty_function_body() {
|
||||
let src = r#"
|
||||
game "T" { mapper: NROM }
|
||||
fun noop() {}
|
||||
on frame { wait_frame }
|
||||
start Main
|
||||
"#;
|
||||
let prog = parse_ok(src);
|
||||
assert_eq!(prog.functions.len(), 1);
|
||||
assert!(prog.functions[0].body.statements.is_empty());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn empty_state_handlers() {
|
||||
let src = r#"
|
||||
game "T" { mapper: NROM }
|
||||
state Main {
|
||||
on enter {}
|
||||
on exit {}
|
||||
on frame {}
|
||||
}
|
||||
start Main
|
||||
"#;
|
||||
let prog = parse_ok(src);
|
||||
assert!(prog.states[0]
|
||||
.on_enter
|
||||
.as_ref()
|
||||
.unwrap()
|
||||
.statements
|
||||
.is_empty());
|
||||
assert!(prog.states[0]
|
||||
.on_exit
|
||||
.as_ref()
|
||||
.unwrap()
|
||||
.statements
|
||||
.is_empty());
|
||||
assert!(prog.states[0]
|
||||
.on_frame
|
||||
.as_ref()
|
||||
.unwrap()
|
||||
.statements
|
||||
.is_empty());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn button_start_in_condition() {
|
||||
// "start" is a keyword but valid as a button name
|
||||
let src = r#"
|
||||
game "T" { mapper: NROM }
|
||||
on frame {
|
||||
if button.start { wait_frame }
|
||||
}
|
||||
start Main
|
||||
"#;
|
||||
let prog = parse_ok(src);
|
||||
let frame = prog.states[0].on_frame.as_ref().unwrap();
|
||||
match &frame.statements[0] {
|
||||
Statement::If(Expr::ButtonRead(_, button, _), _, _, _, _) => {
|
||||
assert_eq!(button, "start");
|
||||
}
|
||||
other => panic!("expected if with button.start, got {other:?}"),
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn button_select_in_condition() {
|
||||
let src = r#"
|
||||
game "T" { mapper: NROM }
|
||||
on frame {
|
||||
if button.select { wait_frame }
|
||||
}
|
||||
start Main
|
||||
"#;
|
||||
parse_ok(src); // "select" is a keyword too — must parse as button name
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn multiple_draws_in_sequence() {
|
||||
let src = r#"
|
||||
game "T" { mapper: NROM }
|
||||
var x: u8 = 0
|
||||
on frame {
|
||||
draw A at: (0, 0)
|
||||
draw B at: (10, 10)
|
||||
draw C at: (20, 20)
|
||||
x += 1
|
||||
}
|
||||
start Main
|
||||
"#;
|
||||
let prog = parse_ok(src);
|
||||
let frame = prog.states[0].on_frame.as_ref().unwrap();
|
||||
assert_eq!(frame.statements.len(), 4); // 3 draws + 1 assignment
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn parser_no_panic_on_garbage() {
|
||||
// The parser should never panic, only return errors.
|
||||
let garbage_inputs = [
|
||||
"",
|
||||
"{}{}{}",
|
||||
"game",
|
||||
"game \"\"",
|
||||
"game \"\" {",
|
||||
"game \"\" { mapper: }",
|
||||
"var : = 0",
|
||||
"fun () {}",
|
||||
"if if if",
|
||||
"while { }",
|
||||
"draw",
|
||||
"draw X",
|
||||
"draw X at:",
|
||||
"draw X at: (",
|
||||
"draw X at: (0",
|
||||
"draw X at: (0,",
|
||||
"draw X at: (0, 0",
|
||||
"sprite {",
|
||||
"palette { colors: }",
|
||||
"[[[",
|
||||
"))))",
|
||||
"0x 0b",
|
||||
"\"unterminated",
|
||||
"/* no block comments */",
|
||||
"!@#$%",
|
||||
&"x ".repeat(1000), // long input
|
||||
];
|
||||
for input in &garbage_inputs {
|
||||
let _ = parse(input); // must not panic
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn lexer_no_panic_on_garbage() {
|
||||
use crate::lexer::lex;
|
||||
let garbage_inputs = [
|
||||
"\0\0\0",
|
||||
"\x01\x02\x03",
|
||||
"\"\\",
|
||||
"0x",
|
||||
"0b",
|
||||
"99999999999999999999",
|
||||
"0xFFFFFFFFFF",
|
||||
&"a".repeat(10000),
|
||||
"!!!!!!",
|
||||
"\t\r\n \t\r\n",
|
||||
];
|
||||
for input in &garbage_inputs {
|
||||
let _ = lex(input); // must not panic
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue