v8/test/mjsunit/wasm/divrem-trap.js

// Copyright 2015 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.

// Flags: --expose-wasm --expose-gc --allow-natives-syntax

load("test/mjsunit/wasm/wasm-module-builder.js");

var assertTraps = function(messageId, code) {
  assertThrows(code, WebAssembly.RuntimeError, kTrapMsgs[messageId]);
}


function makeBinop(opcode) {
  var builder = new WasmModuleBuilder();

  builder.addFunction("main", kSig_i_ii)
    .addBody([
      kExprGetLocal, 0,           // --
      kExprGetLocal, 1,           // --
      opcode,                     // --
    ])
    .exportFunc();

  return builder.instantiate().exports.main;
}

var divs = makeBinop(kExprI32DivS);
var divu = makeBinop(kExprI32DivU);

assertEquals( 33, divs( 333, 10));
assertEquals(-33, divs(-336, 10));

assertEquals(       44, divu( 445, 10));
assertEquals(429496685, divu(-446, 10));

assertTraps(kTrapDivByZero, "divs(100, 0);");
assertTraps(kTrapDivByZero, "divs(-1009, 0);");

assertTraps(kTrapDivByZero, "divu(200, 0);");
assertTraps(kTrapDivByZero, "divu(-2009, 0);");

assertTraps(kTrapDivUnrepresentable, "divs(0x80000000, -1)");
assertEquals(0, divu(0x80000000, -1));


var rems = makeBinop(kExprI32RemS);
var remu = makeBinop(kExprI32RemU);

assertEquals( 3, rems( 333, 10));
assertEquals(-6, rems(-336, 10));

assertEquals( 5, remu( 445, 10));
assertEquals( 3, remu(-443, 10));

assertTraps(kTrapRemByZero, "rems(100, 0);");
assertTraps(kTrapRemByZero, "rems(-1009, 0);");

assertTraps(kTrapRemByZero, "remu(200, 0);");
assertTraps(kTrapRemByZero, "remu(-2009, 0);");

assertEquals(-2147483648, remu(0x80000000, -1));
assertEquals(0, rems(0x80000000, -1));