Fix bug in Dart API Dart_IntegerToUint64: crash on negative Mints

runtime/vm/dart_api_impl_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/dart_api_impl.h"
 #include "bin/builtin.h"
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 #include "include/dart_tools_api.h"
@@ skipping 850 matching lines @@
   result = Dart_Invoke(lib, NewString("getNull"), 0, NULL);
   EXPECT_VALID(result);
   EXPECT(!Dart_IsNumber(result));
 }
 
 TEST_CASE(IntegerValues) {
   const int64_t kIntegerVal1 = 100;
   const int64_t kIntegerVal2 = 0xffffffff;
   const char* kIntegerVal3 = "0x123456789123456789123456789";
   const uint64_t kIntegerVal4 = 0xffffffffffffffff;
+  const int64_t kIntegerVal5 = -0x7fffffffffffffff;
 
   Dart_Handle val1 = Dart_NewInteger(kIntegerVal1);
   EXPECT(Dart_IsInteger(val1));
   bool fits = false;
   Dart_Handle result = Dart_IntegerFitsIntoInt64(val1, &fits);
   EXPECT_VALID(result);
   EXPECT(fits);
 
   Dart_Handle val2 = Dart_NewInteger(kIntegerVal2);
   EXPECT(Dart_IsInteger(val2));
@@ skipping 26 matching lines @@
   uint64_t out4 = 0;
   result = Dart_IntegerToUint64(val4, &out4);
   EXPECT_VALID(result);
   EXPECT_EQ(kIntegerVal4, out4);
 
   Dart_Handle val5 = Dart_NewInteger(-1);
   EXPECT_VALID(val5);
   uint64_t out5 = 0;
   result = Dart_IntegerToUint64(val5, &out5);
   EXPECT(Dart_IsError(result));
+
+  Dart_Handle val6 = Dart_NewInteger(kIntegerVal5);
+  EXPECT_VALID(val6);
+  uint64_t out6 = 0;
+  result = Dart_IntegerToUint64(val6, &out6);
+  EXPECT(Dart_IsError(result));
 }
 
 TEST_CASE(IntegerFitsIntoInt64) {
   Dart_Handle max = Dart_NewInteger(kMaxInt64);
   EXPECT(Dart_IsInteger(max));
   bool fits = false;
   Dart_Handle result = Dart_IntegerFitsIntoInt64(max, &fits);
   EXPECT_VALID(result);
   EXPECT(fits);
 
@@ skipping 8700 matching lines @@
   EXPECT_VALID(result);
   result = Dart_FinalizeLoading(false);
   EXPECT_VALID(result);
   result = Dart_Invoke(lib, NewString("foozoo"), 0, NULL);
   EXPECT(Dart_IsError(result));
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart