Add flags to force or prevent setting of isolate.is_memory_constrained.

test/cctest/test-flags.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 36 matching lines @@
 }
 
 
 TEST(Flags1) {
   FlagList::PrintHelp();
 }
 
 
 TEST(Flags2) {
   SetFlagsToDefault();
-  int argc = 7;
-  const char* argv[] = { "Test2", "-notesting-bool-flag", "notaflag",
+  int argc = 8;
+  const char* argv[] = { "Test2", "-notesting-bool-flag",
+                         "--notesting-maybe-bool-flag", "notaflag",
                          "--testing_int_flag=77", "-testing_float_flag=.25",
                          "--testing_string_flag", "no way!" };
   CHECK_EQ(0, FlagList::SetFlagsFromCommandLine(&argc,
                                                 const_cast<char **>(argv),
                                                 false));
-  CHECK_EQ(7, argc);
+  CHECK_EQ(8, argc);
   CHECK(!FLAG_testing_bool_flag);
+  CHECK(FLAG_testing_maybe_bool_flag.has_value);
+  CHECK(!FLAG_testing_maybe_bool_flag.value);
   CHECK_EQ(77, FLAG_testing_int_flag);
   CHECK_EQ(.25, FLAG_testing_float_flag);
   CHECK_EQ(0, strcmp(FLAG_testing_string_flag, "no way!"));
 }
 
 
 TEST(Flags2b) {
   SetFlagsToDefault();
   const char* str =
       " -notesting-bool-flag notaflag   --testing_int_flag=77 "
+      "-notesting-maybe-bool-flag   "
       "-testing_float_flag=.25  "
       "--testing_string_flag   no_way!  ";
   CHECK_EQ(0, FlagList::SetFlagsFromString(str, StrLength(str)));
   CHECK(!FLAG_testing_bool_flag);
+  CHECK(FLAG_testing_maybe_bool_flag.has_value);
+  CHECK(!FLAG_testing_maybe_bool_flag.value);
   CHECK_EQ(77, FLAG_testing_int_flag);
   CHECK_EQ(.25, FLAG_testing_float_flag);
   CHECK_EQ(0, strcmp(FLAG_testing_string_flag, "no_way!"));
 }
 
 
 TEST(Flags3) {
   SetFlagsToDefault();
-  int argc = 8;
+  int argc = 9;
   const char* argv[] =
-      { "Test3", "--testing_bool_flag", "notaflag",
+      { "Test3", "--testing_bool_flag", "--testing-maybe-bool-flag", "notaflag",
         "--testing_int_flag", "-666",
         "--testing_float_flag", "-12E10", "-testing-string-flag=foo-bar" };
   CHECK_EQ(0, FlagList::SetFlagsFromCommandLine(&argc,
                                                 const_cast<char **>(argv),
                                                 true));
   CHECK_EQ(2, argc);
   CHECK(FLAG_testing_bool_flag);
+  CHECK(FLAG_testing_maybe_bool_flag.has_value);
+  CHECK(FLAG_testing_maybe_bool_flag.value);
   CHECK_EQ(-666, FLAG_testing_int_flag);
   CHECK_EQ(-12E10, FLAG_testing_float_flag);
   CHECK_EQ(0, strcmp(FLAG_testing_string_flag, "foo-bar"));
 }
 
 
 TEST(Flags3b) {
   SetFlagsToDefault();
   const char* str =
-      "--testing_bool_flag notaflag --testing_int_flag -666 "
+      "--testing_bool_flag --testing-maybe-bool-flag notaflag "
+      "--testing_int_flag -666 "
       "--testing_float_flag -12E10 "
       "-testing-string-flag=foo-bar";
   CHECK_EQ(0, FlagList::SetFlagsFromString(str, StrLength(str)));
   CHECK(FLAG_testing_bool_flag);
+  CHECK(FLAG_testing_maybe_bool_flag.has_value);
+  CHECK(FLAG_testing_maybe_bool_flag.value);
   CHECK_EQ(-666, FLAG_testing_int_flag);
   CHECK_EQ(-12E10, FLAG_testing_float_flag);
   CHECK_EQ(0, strcmp(FLAG_testing_string_flag, "foo-bar"));
 }
 
 
 TEST(Flags4) {
   SetFlagsToDefault();
   int argc = 3;
   const char* argv[] = { "Test4", "--testing_bool_flag", "--foo" };
   CHECK_EQ(0, FlagList::SetFlagsFromCommandLine(&argc,
                                                 const_cast<char **>(argv),
                                                 true));
   CHECK_EQ(2, argc);
+  CHECK(!FLAG_testing_maybe_bool_flag.has_value);
 }
 
 
 TEST(Flags4b) {
   SetFlagsToDefault();
   const char* str = "--testing_bool_flag --foo";
   CHECK_EQ(2, FlagList::SetFlagsFromString(str, StrLength(str)));
+  CHECK(!FLAG_testing_maybe_bool_flag.has_value);
 }
 
 
 TEST(Flags5) {
   SetFlagsToDefault();
   int argc = 2;
   const char* argv[] = { "Test5", "--testing_int_flag=\"foobar\"" };
   CHECK_EQ(1, FlagList::SetFlagsFromCommandLine(&argc,
                                                 const_cast<char **>(argv),
                                                 true));
@@ skipping 95 matching lines @@
   // if the list of arguments ends unexpectedly.
   SetFlagsToDefault();
   int argc = 3;
   const char* argv[] = { "", "--crankshaft", "--expose-debug-as" };
   CHECK_EQ(2, FlagList::SetFlagsFromCommandLine(&argc,
                                                 const_cast<char **>(argv),
                                                 true));
   CHECK_NE(NULL, argv[1]);
   CHECK_EQ(argc, 2);
 }