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-constants.js");

function assertTraps(code, msg) {
  var threwException = true;
  try {
    if (typeof code === 'function') {
      code();
    } else {
      eval(code);
    }
    threwException = false;
  } catch (e) {
    if (typeof type_opt === 'function') {
      assertInstanceof(e, type_opt);
    }
    if (arguments.length >= 3) {
      assertEquals(e.type, cause_opt);
    }
    // Success.
    return;
  }
  throw new MjsUnitAssertionError("Did not throw exception");
}


function makeDivRem(opcode) {
  var kBodySize = 5;
  var kNameMainOffset = 6 + 11 + kBodySize + 1;

  var data = bytes(
    // signatures
    kDeclSignatures, 1,
    2, kAstI32, kAstI32, kAstI32, // (int,int) -> int
    // -- main function
    kDeclFunctions, 1,
    kDeclFunctionName | kDeclFunctionExport,
    0, 0,
    kNameMainOffset, 0, 0, 0,   // name offset
    kBodySize, 0,
    // main body
    opcode,                     // --
    kExprGetLocal, 0,           // --
    kExprGetLocal, 1,           // --
    // names
    kDeclEnd,
    'm', 'a', 'i', 'n', 0       //  --
  );

  var module = _WASMEXP_.instantiateModule(data);

  assertEquals("function", typeof module.main);

  return module.main;
}

var divs = makeDivRem(kExprI32DivS);
var divu = makeDivRem(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 = makeDivRem(kExprI32RemS);
var remu = makeDivRem(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));