spill.js

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

// RUN: %hermes -target=HBC -O %s | %FileCheck --match-full-lines %s
// RUN: %hermes -fstatic-builtins -target=HBC -O %s | %FileCheck --match-full-lines %s

function foo() {
  function f() {
    var count = 0;
    for(var arg in arguments) {
      count++;
    }
    return count;
  }

  // These variables will bump the register count a little
  var a1 = f();
  var a2 = f();
  var a3 = f();
  var a4 = f();
  var a5 = f();

  // This is a call that requires 255 registers, causing an overflow.
  // Arguments to calls shouldn't be moved by the spiller.
  var x = f(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
      19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
      37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54,
      55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72,
      73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90,
      91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106,
      107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120,
      121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134,
      135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148,
      149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162,
      163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176,
      177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190,
      191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204,
      205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218,
      219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232,
      233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246,
      247, 248, 249, 250, 251, 252, 253);
  Array.isArray(254);
  return x+a1+a2+a3+a4+a5;
}

// CHECK-LABEL: 254
print(foo());