[regexp fuzzer] Let the fuzzer input select the regexp flag.

test/fuzzer/regexp.cc

 // Copyright 2016 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.
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "include/v8.h"
 #include "src/factory.h"
@@ skipping 39 matching lines @@
   const i::uc16 two_byte_array[6] = {'f', 0xD83D, 0xDCA9, 'b', 'a', 0x2603};
 
   i::Handle<i::RegExpMatchInfo> results_array = factory->NewRegExpMatchInfo();
   i::Handle<i::String> one_byte =
       factory->NewStringFromOneByte(i::Vector<const uint8_t>(one_byte_array, 6))
           .ToHandleChecked();
   i::Handle<i::String> two_byte =
       factory->NewStringFromTwoByte(i::Vector<const i::uc16>(two_byte_array, 6))
           .ToHandleChecked();
 
-  for (int flags = 0; flags <= kAllFlags; flags++) {
-    i::Handle<i::JSRegExp> regexp;
-    {
-      v8::TryCatch try_catch(isolate);
-      i::MaybeHandle<i::JSRegExp> maybe_regexp =
-          i::JSRegExp::New(source, static_cast<i::JSRegExp::Flags>(flags));
-      if (!maybe_regexp.ToHandle(&regexp)) {
-        i_isolate->clear_pending_exception();
-        continue;
-      }
+  i::Handle<i::JSRegExp> regexp;
+  {
+    v8::TryCatch try_catch(isolate);
+    // Create a string so that we can calculate a hash from the input data.
+    std::string str = std::string(reinterpret_cast<const char*>(data), size);
+    i::JSRegExp::Flags flag = static_cast<i::JSRegExp::Flags>(
+        std::hash<std::string>()(str) % (kAllFlags + 1));
+    i::MaybeHandle<i::JSRegExp> maybe_regexp = i::JSRegExp::New(source, flag);
+    if (!maybe_regexp.ToHandle(&regexp)) {
+      i_isolate->clear_pending_exception();
+      return 0;
     }
-    Test(isolate, regexp, one_byte, results_array);
-    Test(isolate, regexp, two_byte, results_array);
-    Test(isolate, regexp, factory->empty_string(), results_array);
-    Test(isolate, regexp, source, results_array);
   }
-
-  isolate->RequestGarbageCollectionForTesting(

[mmoroz, 2016/11/22 10:46:38]

Could you please return this call?

[ahaas, 2016/11/22 12:30:56]

Done.

-      v8::Isolate::kFullGarbageCollection);
+  Test(isolate, regexp, one_byte, results_array);
+  Test(isolate, regexp, two_byte, results_array);
+  Test(isolate, regexp, factory->empty_string(), results_array);
+  Test(isolate, regexp, source, results_array);
   return 0;
 }