From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 js/src/fuzz-tests/differential-parsing.js | 148 ++++++++++++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100644 js/src/fuzz-tests/differential-parsing.js

(limited to 'js/src/fuzz-tests/differential-parsing.js')

diff --git a/js/src/fuzz-tests/differential-parsing.js b/js/src/fuzz-tests/differential-parsing.js
new file mode 100644
index 0000000000..1a61175721
--- /dev/null
+++ b/js/src/fuzz-tests/differential-parsing.js
@@ -0,0 +1,148 @@
+/* -*- Mode: javascript; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This file is used to detect and find cases where the Visage's parser is
+// accepting more inputs than SpiderMonkey's parser.
+//
+// 1. Find new cases:
+//
+//   To find new cases, we have to build with libFuzzer. The JS Shell can easily
+//   be built with libFuzzer by adding --enable-fuzzing to the configure script
+//   command line.
+//
+//   Create a directory, and copy all test cases from the JS shell to this
+//   directory:
+//
+//     $ mkdir fuzzer-input
+//     $ cd fuzzer-input
+//     $ find ../ -name \*.js -print0 | xargs -I '{}' -0 -n1 cp '{}' $(pwd)
+//
+//   Once the JS Shell is built, set the FUZZER environment variable to this
+//   script location.
+//
+//     $ FUZZER="./fuzz-tests/differential-parsing.js" build.dir/dist/bin/js -- \
+//        -use_value_profile=1 -print_pcs=1 -timeout=5 -max_len=32 -only_ascii=1 \
+//        ./fuzzer-input
+//
+// 2. Test a crashing test case:
+//
+//   Once a new crashing test case is found, this script can be used to
+//   reproduce the crashing conditions.
+//
+//   To do so, you need a JS Shell and to load this script and use the testFile
+//   function with the location of the crashing file.
+//
+//     $ build.dir/dist/bin/js
+//     js> load("./fuzz-tests/differential-parsing.js");
+//     js> testFile("./crash-42");
+//     Parse Script C++: fail
+//     Parse Module C++: fail
+//     Parse Script Rust: succeed
+//     Parse Module Rust: fail
+//     Hit MOZ_CRASH(Rust accept more than C++)
+//
+
+/* global crash, os, parse, timeout */
+
+// This global will hold the current fuzzing buffer for each iteration.
+var fuzzBuf;
+
+function timed(sec, f) {
+  // If the function `f` takes more than 3 seconds, then the evaluation ends
+  // prematurely and returns in libFuzzer handler without considering this
+  // test case as interesting.
+  timeout(sec, function() {
+    return false;
+  });
+  f();
+
+  // Remove the timeout handler, to not kill future executions.
+  timeout(-1);
+}
+
+var parseScriptCpp = { module: false, smoosh: false };
+var parseScriptRust = { module: false, smoosh: true };
+var parseModuleRust = { module: true, smoosh: true };
+var parseModuleCpp = { module: true, smoosh: false };
+function test(code, verbose = false) {
+  var isScriptCpp = false,
+    isModuleCpp = false,
+    isScriptRust = false,
+    isModuleRust = false;
+  try {
+    parse(code, parseScriptCpp);
+    isScriptCpp = true;
+    if (verbose) {
+      console.log("Parse Script C++: succeed");
+    }
+  } catch (exc) {
+    if (verbose) {
+      console.log("Parse Script C++: fail");
+    }
+  }
+  try {
+    parse(code, parseModuleCpp);
+    isModuleCpp = true;
+    if (verbose) {
+      console.log("Parse Module C++: succeed");
+    }
+  } catch (exc) {
+    if (verbose) {
+      console.log("Parse Module C++: fail");
+    }
+  }
+  try {
+    parse(code, parseScriptRust);
+    isScriptRust = true;
+    if (verbose) {
+      console.log("Parse Script Rust: succeed");
+    }
+  } catch (exc) {
+    if (verbose) {
+      console.log("Parse Script Rust: fail");
+    }
+  }
+  try {
+    parse(code, parseModuleRust);
+    isModuleRust = true;
+    if (verbose) {
+      console.log("Parse Module Rust: succeed");
+    }
+  } catch (exc) {
+    if (verbose) {
+      console.log("Parse Module Rust: fail");
+    }
+  }
+  if ((isScriptRust && !isScriptCpp) || (isModuleRust && !isModuleCpp)) {
+    crash("Rust accept more than C++");
+  }
+}
+
+function JSFuzzIterate() {
+  // This function is called per iteration. You must ensure that:
+  //
+  //   1) Each of your actions/decisions is only based on fuzzBuf,
+  //      in particular not on Math.random(), Date/Time or other
+  //      external inputs.
+  //
+  //   2) Your actions should be deterministic. The same fuzzBuf
+  //      should always lead to the same set of actions/decisions.
+  //
+  //   3) You can modify the global where needed, but ensure that
+  //      each iteration is isolated from one another by cleaning
+  //      any modifications to the global after each iteration.
+  //      In particular, iterations must not depend on or influence
+  //      each other in any way (see also 1)).
+  //
+  //   4) You must catch all exceptions.
+  let code = String.fromCharCode(...fuzzBuf);
+  timed(3, _ => test(code));
+  return 0;
+}
+
+function testFile(file) {
+  let content = os.file.readFile(file);
+  test(content, true);
+}
-- 
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