[parser|js-perf-test] Add js-perf tests for parsing / scanning.

These will tight-loop scanning primitives.

BUG=v8:6092

Change-Id: I9bf0f1952755bbede3c545c45fe2c4a210548171
Reviewed-on: https://chromium-review.googlesource.com/647526Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47788}

test/js-perf-test/JSTests.json

@@ -612,6 +612,18 @@
         {"name": "Runtime.evaluate(String16Cstor)"},
         {"name": "Debugger.getPossibleBreakpoints"}
       ]
+    },
+    {
+      "name": "Parsing",
+      "path": ["Parsing"],
+      "main": "run.js",
+      "resources": [ "comments.js"],
+      "results_regexp": "^%s\\-Parsing\\(Score\\): (.+)$",
+      "tests": [
+        {"name": "OneLineComment"},
+        {"name": "OneLineComments"},
+        {"name": "MultiLineComment"}
+      ]
     }
   ]
 }

test/js-perf-test/Parsing/comments.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+const iterations = 100;
+
+// Each benchmark.run is surrounded by a loop of 100. To generate the right
+// amount of test cases, we just need to know this constant.
+const fixed_iterations_by_runner = 100;
+
+new BenchmarkSuite('OneLineComment', [1000], [
+  new Benchmark('OneLineComment', false, true, iterations, Run, OneLineCommentSetup)
+]);
+
+new BenchmarkSuite('OneLineComments', [1000], [
+  new Benchmark('OneLineComments', false, true, iterations, Run, OneLineCommentsSetup)
+]);
+
+new BenchmarkSuite('MultiLineComment', [1000], [
+  new Benchmark('MultiLineComment', false, true, iterations, Run, MultiLineCommentSetup)
+]);
+
+let codes;
+let ix;
+
+// Functions generating the code snippets which the actual test will eval. The
+// snippets need to be different for each iteration, so that we won't hit the
+// compilation cache.
+
+function OneLineCommentSetup() {
+  codes = [];
+  ix = 0;
+  for (let i = 0; i < iterations * fixed_iterations_by_runner; ++i) {
+    let code = "//" + " This is a comment... ".repeat(600) + i;
+    codes.push(code);
+  }
+}
+
+function OneLineCommentsSetup() {
+  codes = [];
+  ix = 0;
+  for (let i = 0; i < iterations * fixed_iterations_by_runner; ++i) {
+    let code = "// This is a comment.\n".repeat(600) + "\n//" + i;
+    codes.push(code);
+  }
+}
+
+function MultiLineCommentSetup() {
+  codes = [];
+  ix = 0;
+  for (let i = 0; i < iterations * fixed_iterations_by_runner; ++i) {
+    let code = "/*" + " This is a comment... ".repeat(600) + "*/" + i;
+    codes.push(code);
+  }
+}
+
+function Run() {
+   if (ix >= codes.length) {
+    throw new Error("Not enough test data");
+  }
+  eval(codes[ix]);
+  ++ix;
+}

test/js-perf-test/Parsing/run.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+load('../base.js');
+
+load('comments.js');
+
+var success = true;
+
+function PrintResult(name, result) {
+  print(name + '-Parsing(Score): ' + result);
+}
+
+
+function PrintError(name, error) {
+  PrintResult(name, error);
+  success = false;
+}
+
+
+BenchmarkSuite.config.doWarmup = undefined;
+BenchmarkSuite.config.doDeterministic = undefined;
+
+BenchmarkSuite.RunSuites({ NotifyResult: PrintResult,
+                           NotifyError: PrintError });