WIP: Test262 support

.github/workflows/update-test262-tests.yml

@@ -0,0 +1,58 @@
+name: Update Test262 tests
+
+on:
+  # Trigger at every Sunday UTC noon, or manually.
+  schedule:
+    - cron: '0 12 * * 0'
+  workflow_dispatch:
+
+jobs:
+  update-test262:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout WPT repo
+        uses: actions/checkout@v4
+        with:
+          path: wpt
+      - name: Checkout Test262 repo
+        uses: actions/checkout@v4
+        with:
+          repository: tc39/test262
+          path: test262-spec
+      - name: Copy Test262 tests to WPT
+        run: |
+          LATEST_SHA=$(git -C test262-spec rev-parse HEAD)
+          echo "Latest remote Test262 SHA: $LATEST_SHA"
+
+          mkdir -p wpt/third_party/test262/test/
+          mkdir -p wpt/third_party/test262/harness/
+          rsync -a --delete test262-spec/test/ wpt/third_party/test262/test/
+          rsync -a --delete test262-spec/harness/ wpt/third_party/test262/harness/
+          printf "[test262]\nsource = \"https://github.com/tc39/test262\"\nrev = \"${LATEST_SHA}\"\n" > wpt/third_party/test262/vendored.toml
+      - name: Commit changes
+        id: commit
+        continue-on-error: true
+        run: |
+          cd wpt
+          export BRANCH_NAME="$BRANCH_PREFIX-$(date +'%Y%m%d%H%M%S')"
+          echo "BRANCH_NAME=$BRANCH_NAME" >> $GITHUB_ENV
+          git config user.name "$GIT_AUTHOR_NAME"
+          git config user.email "$GIT_AUTHOR_EMAIL"
+          git checkout -B $BRANCH_NAME
+          git add third_party/test262/
+          git commit -m "$COMMIT_TITLE"
+        env:
+          GIT_AUTHOR_NAME: "wpt-pr-bot"
+          GIT_AUTHOR_EMAIL: "[email protected]"
+          BRANCH_PREFIX: "test262-update"
+          COMMIT_TITLE: "Update Test262 tests"
+      - name: Create PR
+        if: ${{ steps.commit.outcome == 'success' }}
+        run: |
+          cd wpt
+          git push --set-upstream origin $BRANCH_NAME
+          gh pr create --title "$COMMIT_TITLE" --body "$PR_BODY"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COMMIT_TITLE: "Update Test262 tests"
+          PR_BODY: "Scheduled weekly update auto-generated by the '${{ github.workflow }}' workflow."

infrastructure/metadata/infrastructure/test262/basic-failure.js.ini

@@ -0,0 +1,4 @@
+[basic-failure.test262.html]
+  expected: OK
+  [Test]
+    expected: FAIL

infrastructure/metadata/infrastructure/test262/basic.js.ini

@@ -0,0 +1,4 @@
+[basic.test262.html]
+  expected: OK
+  [Test]
+    expected: PASS

infrastructure/metadata/infrastructure/test262/error.js.ini

@@ -0,0 +1,4 @@
+[error.test262.html]
+  expected: OK
+  [Test]
+    expected: FAIL

infrastructure/metadata/infrastructure/test262/module-error.js.ini

@@ -0,0 +1,4 @@
+[module-error.test262-module.html]
+  expected: ERROR
+  [Test]
+    expected: FAIL

infrastructure/metadata/infrastructure/test262/module-failure.js.ini

@@ -0,0 +1,4 @@
+[module-failure.test262-module.html]
+  expected: OK
+  [Test]
+    expected: FAIL

infrastructure/metadata/infrastructure/test262/module.js.ini

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+[module.test262-module.html]
+  expected: OK
+  [Test]
+    expected: PASS

infrastructure/metadata/infrastructure/test262/negative-error.js.ini

@@ -0,0 +1,4 @@
+[negative-error.test262.html]
+  expected: ERROR
+  [Test]
+    expected: FAIL

infrastructure/metadata/infrastructure/test262/negative-failure.js.ini

@@ -0,0 +1,4 @@
+[negative-failure.test262.html]
+  expected: OK
+  [Test]
+    expected: FAIL

infrastructure/metadata/infrastructure/test262/negative.js.ini

@@ -0,0 +1,4 @@
+[negative.test262.html]
+  expected: OK
+  [Test]
+    expected: PASS

infrastructure/metadata/infrastructure/test262/strict-error.js.ini

@@ -0,0 +1,4 @@
+[strict-error.test262.strict.html]
+  expected: ERROR
+  [Test]
+    expected: FAIL

infrastructure/metadata/infrastructure/test262/strict-failure.js.ini

@@ -0,0 +1,4 @@
+[strict-failure.test262.strict.html]
+  expected: OK
+  [Test]
+    expected: FAIL

infrastructure/metadata/infrastructure/test262/strict.js.ini

@@ -0,0 +1,4 @@
+[strict.test262.html]
+  expected: OK
+  [Test]
+    expected: PASS

infrastructure/metadata/infrastructure/test262/unexpected-error.js.ini

@@ -0,0 +1,4 @@
+[unexpected-error.test262.html]
+  expected: ERROR
+  [Test]
+    expected: FAIL

infrastructure/test262/basic-failure.js

@@ -0,0 +1,6 @@
+/*---
+description: A basic Test262 smoketest that fails
+features: [Test262]
+---*/
+
+assert.sameValue(1, 2, "One should be two");

infrastructure/test262/basic.js

@@ -0,0 +1,6 @@
+/*---
+description: A basic Test262 smoketest
+features: [Test262]
+---*/
+
+assert.sameValue(1, 1, "One should be one");

infrastructure/test262/error.js

@@ -0,0 +1,5 @@
+/*---
+description: A smoketest that throws a Test262Error
+---*/
+
+throw new Test262Error("This is a deliberate test failure.");

infrastructure/test262/module-error.js

@@ -0,0 +1,6 @@
+/*---
+description: A module smoketest that throws an unexpected ReferenceError.
+flags: [module]
+---*/
+import { a } from "./support/module-helper.js";
+foo.bar();

infrastructure/test262/module-failure.js

@@ -0,0 +1,6 @@
+/*---
+description: A module smoketest that fails an assertion.
+flags: [module]
+---*/
+import { a } from "./support/module-helper.js";
+assert.sameValue(a, 2, "a should be 2 in module");

infrastructure/test262/module.js

@@ -0,0 +1,5 @@
+/*---
+description: A module smoketest
+flags: [module]
+---*/
+import { a } from "./support/module-helper.js";

infrastructure/test262/negative-error.js

@@ -0,0 +1,8 @@
+/*---
+description: A negative test that throws a different error than expected.
+negative:
+  phase: runtime
+  type: TypeError
+---*/
+
+throw new RangeError();

infrastructure/test262/negative-failure.js

@@ -0,0 +1,6 @@
+/*---
+description: A negative smoketest that is expected to fail because it does not throw an error.
+negative:
+  phase: runtime
+  type: Test262Error
+---*/

infrastructure/test262/negative.js

@@ -0,0 +1,7 @@
+/*---
+description: A negative smoketest
+negative:
+  phase: runtime
+  type: Test262Error
+---*/
+throw new Test262Error();

infrastructure/test262/strict-error.js

@@ -0,0 +1,6 @@
+/*---
+description: A strict mode smoketest that throws an unexpected ReferenceError.
+flags: [onlyStrict]
+---*/
+"use strict";
+foo.bar();

infrastructure/test262/strict-failure.js

@@ -0,0 +1,6 @@
+/*---
+description: A strict mode smoketest that fails an assertion.
+flags: [onlyStrict]
+---*/
+"use strict";
+assert.sameValue(1, 2, "One should be two in strict mode");

infrastructure/test262/strict.js

@@ -0,0 +1,8 @@
+/*---
+description: A strict-mode smoketest from https://github.com/tc39/test262/blob/main/INTERPRETING.md
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+$DONOTEVALUATE();
+var a\u2E2F;

infrastructure/test262/support/module-helper.js

@@ -0,0 +1 @@
+export const a = 1;

infrastructure/test262/unexpected-error.js

@@ -0,0 +1,5 @@
+/*---
+description: A smoketest that throws an unexpected ReferenceError.
+---*/
+
+foo.bar();

lint.ignore

@@ -841,3 +841,5 @@ PROMISE_REJECTS: wasm/core/js/harness/testharness.js
 
 # Legitimate use of test_driver_internal
 TEST DRIVER INTERNAL: resources/testdriver.js
+
+*: third_party/test262/*

resources/test262/harness-adapter.js

@@ -0,0 +1,173 @@
+function installAPI(global) {
+  global.$262 = {
+    createRealm: function() {
+      var iframe = global.document.createElement('iframe');
+      iframe.style.cssText = 'display: none';
+      iframe.src = '';  // iframeSrc;
+      if (global.document.body === null) {
+        global.document.body = global.document.createElement('body');
+      }
+      global.document.body.appendChild(iframe);
+      return installAPI(iframe.contentWindow);
+    },
+    evalScript: function(src) {
+      var script = global.document.createElement('script');
+      script.text = src;
+      window.__test262_evalScript_error_ = undefined;
+      global.document.head.appendChild(script);
+      // Errors in the above appendChild bubble up to the global error handler.
+      // Our testharnes-client.js stashes them in a global var for rethrowing.
+      if (window.__test262_evalScript_error_) {
+          err = window.__test262_evalScript_error_;
+          window.__test262_evalScript_error_ = undefined;
+          throw err;
+      }
+    },
+    detachArrayBuffer: function(buffer) {
+      if (typeof postMessage !== 'function') {
+        throw new Error('No method available to detach an ArrayBuffer');
+      } else {
+        postMessage(null, '*', [buffer]);
+        /*
+          See
+          https://html.spec.whatwg.org/multipage/comms.html#dom-window-postmessage
+          which calls
+          https://html.spec.whatwg.org/multipage/infrastructure.html#structuredclonewithtransfer
+          which calls
+          https://html.spec.whatwg.org/multipage/infrastructure.html#transfer-abstract-op
+          which calls the DetachArrayBuffer abstract operation
+          https://tc39.github.io/ecma262/#sec-detacharraybuffer
+        */
+      }
+    },
+    gc: function() {
+      if (typeof gc !== 'function') {
+        throw new Error('No method available to invoke a GC');
+      }
+      gc();
+    },
+    AbstractModuleSource: function() {
+      throw new Error('AbstractModuleSource not available');
+    },
+    agent: (function () {
+      var workers = [];
+      var i32a = null;
+      var pendingReports = [];
+
+      // Agents call Atomics.wait on this location to sleep.
+      var SLEEP_LOC = 0;
+      // 1 if the started worker is ready, 0 otherwise.
+      var START_LOC = 1;
+      // The number of workers that have received the broadcast.
+      var BROADCAST_LOC = 2;
+      // Each worker has a count of outstanding reports; worker N uses memory
+      // location [WORKER_REPORT_LOC + N].
+      var WORKER_REPORT_LOC = 3;
+
+      function workerScript(script) {
+        return `
+          var index;
+          var i32a = null;
+          var broadcasts = [];
+          var pendingReceiver = null;
+
+          function handleBroadcast() {
+            if (pendingReceiver && broadcasts.length > 0) {
+              pendingReceiver.apply(null, broadcasts.shift());
+              pendingReceiver = null;
+            }
+          };
+
+          var onmessage = function({data:msg}) {
+            switch (msg.kind) {
+              case 'start':
+                i32a = msg.i32a;
+                index = msg.index;
+                (0, eval)(\`${script}\`);
+                break;
+
+              case 'broadcast':
+                Atomics.add(i32a, ${BROADCAST_LOC}, 1);
+                broadcasts.push([msg.sab, msg.id]);
+                handleBroadcast();
+                break;
+            }
+          };
+
+          var $262 = {
+            agent: {
+              receiveBroadcast(receiver) {
+                pendingReceiver = receiver;
+                handleBroadcast();
+              },
+
+              report(msg) {
+                postMessage(String(msg));
+                Atomics.add(i32a, ${WORKER_REPORT_LOC} + index, 1);
+              },
+
+              sleep(s) { Atomics.wait(i32a, ${SLEEP_LOC}, 0, s); },
+
+              leaving() {},
+
+              monotonicNow() {
+                return performance.now();
+              }
+            }
+          };`;
+      }
+
+      var agent = {
+        start(script) {
+          if (i32a === null) {
+            i32a = new Int32Array(new SharedArrayBuffer(256));
+          }
+          var w = new Worker(workerScript(script), {type: 'string'});
+          w.index = workers.length;
+          w.postMessage({kind: 'start', i32a: i32a, index: w.index});
+          workers.push(w);
+        },
+
+        broadcast(sab, id) {
+          if (!(sab instanceof SharedArrayBuffer)) {
+            throw new TypeError('sab must be a SharedArrayBuffer.');
+          }
+
+          Atomics.store(i32a, BROADCAST_LOC, 0);
+
+          for (var w of workers) {
+            w.postMessage({kind: 'broadcast', sab: sab, id: id|0});
+          }
+
+          while (Atomics.load(i32a, BROADCAST_LOC) != workers.length) {}
+        },
+
+        getReport() {
+          for (var w of workers) {
+            while (Atomics.load(i32a, WORKER_REPORT_LOC + w.index) > 0) {
+              pendingReports.push(w.getMessage());
+              Atomics.sub(i32a, WORKER_REPORT_LOC + w.index, 1);
+            }
+          }
+
+          return pendingReports.shift() || null;
+        },
+
+        sleep(s) { Atomics.wait(i32a, SLEEP_LOC, 0, s); },
+
+        monotonicNow() {
+          return performance.now();
+        }
+      };
+      return agent;
+
+    })(),
+    global: global
+  };
+  global.$DONE = function() {}
+
+  return global.$262;
+}
+
+installAPI(window);
+