We shouldn't throw under FLAG_debug_code, rather abort.

test/mjsunit/regress/regress-320948.js

-// Copyright 2013 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
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Flags: --allow-natives-syntax --debug-code
-
-var one_byte = %NewString(10, true);
-var two_byte = %NewString(10, false);
-
-function foo1(s, arg1, arg2) {
-  return %_OneByteSeqStringSetChar(s, arg1, arg2)
-}
-foo1(one_byte, 0, 0);
-assertThrows("{ foo1(4, 0, 0); }");
-assertThrows("{ foo1(one_byte, new Object(), 0); }");
-assertThrows("{ foo1(one_byte, 0, new Object()); }");
-assertThrows("{ foo1(one_byte, 100000, 100; }");
-assertThrows("{ foo1(one_byte, -1, 100; }");
-
-function bar1(s, arg1, arg2) {
-  return %_OneByteSeqStringSetChar(s, arg1, arg2)
-}
-
-bar1(one_byte, 0, 0);
-bar1(one_byte, 0, 0);
-bar1(one_byte, 0, 0);
-%OptimizeFunctionOnNextCall(bar1);
-bar1(one_byte, 0, 0);
-assertThrows("{ bar1(4, 0, 0); }");
-assertThrows("{ bar1(one_byte, new Object(), 0); }");
-assertThrows("{ bar1(one_byte, 0, new Object()); }");
-assertThrows("{ bar1(one_byte, 100000, 100; }");
-assertThrows("{ bar1(one_byte, -1, 100; }");
-
-function foo2(s, arg1, arg2) {
-  return %_TwoByteSeqStringSetChar(s, arg1, arg2)
-}
-foo2(two_byte, 0, 0);
-assertThrows("{ foo2(4, 0, 0); }");
-assertThrows("{ foo2(two_byte, new Object(), 0); }");
-assertThrows("{ foo2(two_byte, 0, new Object()); }");
-assertThrows("{ foo2(two_byte, 100000, 100; }");
-assertThrows("{ foo2(two_byte, -1, 100; }");
-
-function bar2(s, arg1, arg2) {
-  return %_TwoByteSeqStringSetChar(s, arg1, arg2)
-}
-
-bar2(two_byte, 0, 0);
-bar2(two_byte, 0, 0);
-bar2(two_byte, 0, 0);
-%OptimizeFunctionOnNextCall(bar2);
-bar2(two_byte, 0, 0);
-assertThrows("{ bar2(4, 0, 0); }");
-assertThrows("{ bar2(two_byte, new Object(), 0); }");
-assertThrows("{ bar2(two_byte, 0, new Object()); }");
-assertThrows("{ bar2(two_byte, 100000, 100; }");
-assertThrows("{ bar2(two_byte, -1, 100; }");