v8/test/mjsunit/harmony/generators-iteration.js
mstarzinger@chromium.org 4d338985b9 Closed generator returns a completed object instead of throwing a error
From ES6 rev20 draft, closed generator returns completed object (the
value is `undefined` and done is `true`).
Since a error thrown in generator is propagated to the caller without
setting status of a thrown generator to "completed", once a generator is
suspended by a error, status becomes "executing" forever. This is filed
as v8:3096

LOG=N
BUG=v8:3097
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/136003003

Patch from Yusuke Suzuki <yusukesuzuki@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18591 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2014-01-14 15:19:34 +00:00

651 lines
19 KiB
JavaScript

// 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: --harmony-generators --expose-gc
// Test generator iteration.
var GeneratorFunction = (function*(){yield 1;}).__proto__.constructor;
function assertIteratorResult(value, done, result) {
assertEquals({ value: value, done: done}, result);
}
function assertIteratorIsClosed(iter) {
assertIteratorResult(undefined, true, iter.next());
assertDoesNotThrow(function() { iter.next(); });
}
function assertThrownIteratorIsClosed(iter) {
// TODO(yusukesuzuki): Since status of a thrown generator is "executing",
// following tests are failed.
// https://code.google.com/p/v8/issues/detail?id=3096
// assertIteratorIsClosed(iter);
}
function TestGeneratorResultPrototype() {
function* g() { yield 1; }
var iter = g();
var result = iter.next();
assertSame(Object.prototype, Object.getPrototypeOf(result));
property_names = Object.getOwnPropertyNames(result);
property_names.sort();
assertEquals(["done", "value"], property_names);
assertIteratorResult(1, false, result);
}
TestGeneratorResultPrototype()
function TestGenerator(g, expected_values_for_next,
send_val, expected_values_for_send) {
function testNext(thunk) {
var iter = thunk();
for (var i = 0; i < expected_values_for_next.length; i++) {
var v1 = expected_values_for_next[i];
var v2 = i == expected_values_for_next.length - 1;
// var v3 = iter.next();
assertIteratorResult(v1, v2, iter.next());
}
assertIteratorIsClosed(iter);
}
function testSend(thunk) {
var iter = thunk();
for (var i = 0; i < expected_values_for_send.length; i++) {
assertIteratorResult(expected_values_for_send[i],
i == expected_values_for_send.length - 1,
iter.next(send_val));
}
assertIteratorIsClosed(iter);
}
function testThrow(thunk) {
for (var i = 0; i < expected_values_for_next.length; i++) {
var iter = thunk();
for (var j = 0; j < i; j++) {
assertIteratorResult(expected_values_for_next[j],
j == expected_values_for_next.length - 1,
iter.next());
}
function Sentinel() {}
assertThrows(function () { iter.throw(new Sentinel); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
}
testNext(g);
testSend(g);
testThrow(g);
testNext(function*() { return yield* g(); });
testSend(function*() { return yield* g(); });
testThrow(function*() { return yield* g(); });
if (g instanceof GeneratorFunction) {
testNext(function() { return new g(); });
testSend(function() { return new g(); });
testThrow(function() { return new g(); });
}
}
TestGenerator(function* g1() { },
[undefined],
"foo",
[undefined]);
TestGenerator(function* g2() { yield 1; },
[1, undefined],
"foo",
[1, undefined]);
TestGenerator(function* g3() { yield 1; yield 2; },
[1, 2, undefined],
"foo",
[1, 2, undefined]);
TestGenerator(function* g4() { yield 1; yield 2; return 3; },
[1, 2, 3],
"foo",
[1, 2, 3]);
TestGenerator(function* g5() { return 1; },
[1],
"foo",
[1]);
TestGenerator(function* g6() { var x = yield 1; return x; },
[1, undefined],
"foo",
[1, "foo"]);
TestGenerator(function* g7() { var x = yield 1; yield 2; return x; },
[1, 2, undefined],
"foo",
[1, 2, "foo"]);
TestGenerator(function* g8() { for (var x = 0; x < 4; x++) { yield x; } },
[0, 1, 2, 3, undefined],
"foo",
[0, 1, 2, 3, undefined]);
// Generator with arguments.
TestGenerator(
function g9() {
return (function*(a, b, c, d) {
yield a; yield b; yield c; yield d;
})("fee", "fi", "fo", "fum");
},
["fee", "fi", "fo", "fum", undefined],
"foo",
["fee", "fi", "fo", "fum", undefined]);
// Too few arguments.
TestGenerator(
function g10() {
return (function*(a, b, c, d) {
yield a; yield b; yield c; yield d;
})("fee", "fi");
},
["fee", "fi", undefined, undefined, undefined],
"foo",
["fee", "fi", undefined, undefined, undefined]);
// Too many arguments.
TestGenerator(
function g11() {
return (function*(a, b, c, d) {
yield a; yield b; yield c; yield d;
})("fee", "fi", "fo", "fum", "I smell the blood of an Englishman");
},
["fee", "fi", "fo", "fum", undefined],
"foo",
["fee", "fi", "fo", "fum", undefined]);
// The arguments object.
TestGenerator(
function g12() {
return (function*(a, b, c, d) {
for (var i = 0; i < arguments.length; i++) {
yield arguments[i];
}
})("fee", "fi", "fo", "fum", "I smell the blood of an Englishman");
},
["fee", "fi", "fo", "fum", "I smell the blood of an Englishman",
undefined],
"foo",
["fee", "fi", "fo", "fum", "I smell the blood of an Englishman",
undefined]);
// Access to captured free variables.
TestGenerator(
function g13() {
return (function(a, b, c, d) {
return (function*() {
yield a; yield b; yield c; yield d;
})();
})("fee", "fi", "fo", "fum");
},
["fee", "fi", "fo", "fum", undefined],
"foo",
["fee", "fi", "fo", "fum", undefined]);
// Abusing the arguments object.
TestGenerator(
function g14() {
return (function*(a, b, c, d) {
arguments[0] = "Be he live";
arguments[1] = "or be he dead";
arguments[2] = "I'll grind his bones";
arguments[3] = "to make my bread";
yield a; yield b; yield c; yield d;
})("fee", "fi", "fo", "fum");
},
["Be he live", "or be he dead", "I'll grind his bones", "to make my bread",
undefined],
"foo",
["Be he live", "or be he dead", "I'll grind his bones", "to make my bread",
undefined]);
// Abusing the arguments object: strict mode.
TestGenerator(
function g15() {
return (function*(a, b, c, d) {
"use strict";
arguments[0] = "Be he live";
arguments[1] = "or be he dead";
arguments[2] = "I'll grind his bones";
arguments[3] = "to make my bread";
yield a; yield b; yield c; yield d;
})("fee", "fi", "fo", "fum");
},
["fee", "fi", "fo", "fum", undefined],
"foo",
["fee", "fi", "fo", "fum", undefined]);
// GC.
TestGenerator(function* g16() { yield "baz"; gc(); yield "qux"; },
["baz", "qux", undefined],
"foo",
["baz", "qux", undefined]);
// Receivers.
TestGenerator(
function g17() {
function* g() { yield this.x; yield this.y; }
var o = { start: g, x: 1, y: 2 };
return o.start();
},
[1, 2, undefined],
"foo",
[1, 2, undefined]);
TestGenerator(
function g18() {
function* g() { yield this.x; yield this.y; }
var iter = new g;
iter.x = 1;
iter.y = 2;
return iter;
},
[1, 2, undefined],
"foo",
[1, 2, undefined]);
TestGenerator(
function* g19() {
var x = 1;
yield x;
with({x:2}) { yield x; }
yield x;
},
[1, 2, 1, undefined],
"foo",
[1, 2, 1, undefined]);
TestGenerator(
function* g20() { yield (1 + (yield 2) + 3); },
[2, NaN, undefined],
"foo",
[2, "1foo3", undefined]);
TestGenerator(
function* g21() { return (1 + (yield 2) + 3); },
[2, NaN],
"foo",
[2, "1foo3"]);
TestGenerator(
function* g22() { yield (1 + (yield 2) + 3); yield (4 + (yield 5) + 6); },
[2, NaN, 5, NaN, undefined],
"foo",
[2, "1foo3", 5, "4foo6", undefined]);
TestGenerator(
function* g23() {
return (yield (1 + (yield 2) + 3)) + (yield (4 + (yield 5) + 6));
},
[2, NaN, 5, NaN, NaN],
"foo",
[2, "1foo3", 5, "4foo6", "foofoo"]);
// Rewind a try context with and without operands on the stack.
TestGenerator(
function* g24() {
try {
return (yield (1 + (yield 2) + 3)) + (yield (4 + (yield 5) + 6));
} catch (e) {
throw e;
}
},
[2, NaN, 5, NaN, NaN],
"foo",
[2, "1foo3", 5, "4foo6", "foofoo"]);
// Yielding in a catch context, with and without operands on the stack.
TestGenerator(
function* g25() {
try {
throw (yield (1 + (yield 2) + 3))
} catch (e) {
if (typeof e == 'object') throw e;
return e + (yield (4 + (yield 5) + 6));
}
},
[2, NaN, 5, NaN, NaN],
"foo",
[2, "1foo3", 5, "4foo6", "foofoo"]);
// Generator function instances.
TestGenerator(GeneratorFunction(),
[undefined],
"foo",
[undefined]);
TestGenerator(new GeneratorFunction(),
[undefined],
"foo",
[undefined]);
TestGenerator(GeneratorFunction('yield 1;'),
[1, undefined],
"foo",
[1, undefined]);
TestGenerator(
function() { return GeneratorFunction('x', 'y', 'yield x + y;')(1, 2) },
[3, undefined],
"foo",
[3, undefined]);
// Access to this with formal arguments.
TestGenerator(
function () {
return ({ x: 42, g: function* (a) { yield this.x } }).g(0);
},
[42, undefined],
"foo",
[42, undefined]);
// Test that yield* re-yields received results without re-boxing.
function TestDelegatingYield() {
function results(results) {
var i = 0;
function next() {
return results[i++];
}
return { next: next }
}
function* yield_results(expected) {
return yield* results(expected);
}
function collect_results(iter) {
var ret = [];
var result;
do {
result = iter.next();
ret.push(result);
} while (!result.done);
return ret;
}
// We have to put a full result for the end, because the return will re-box.
var expected = [{value: 1}, 13, "foo", {value: 34, done: true}];
// Sanity check.
assertEquals(expected, collect_results(results(expected)));
assertEquals(expected, collect_results(yield_results(expected)));
}
TestDelegatingYield();
function TestTryCatch(instantiate) {
function* g() { yield 1; try { yield 2; } catch (e) { yield e; } yield 3; }
function Sentinel() {}
function Test1(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
assertIteratorResult(3, false, iter.next());
assertIteratorIsClosed(iter);
}
Test1(instantiate(g));
function Test2(iter) {
assertThrows(function() { iter.throw(new Sentinel); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test2(instantiate(g));
function Test3(iter) {
assertIteratorResult(1, false, iter.next());
assertThrows(function() { iter.throw(new Sentinel); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test3(instantiate(g));
function Test4(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
var exn = new Sentinel;
assertIteratorResult(exn, false, iter.throw(exn));
assertIteratorResult(3, false, iter.next());
assertIteratorIsClosed(iter);
}
Test4(instantiate(g));
function Test5(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
var exn = new Sentinel;
assertIteratorResult(exn, false, iter.throw(exn));
assertIteratorResult(3, false, iter.next());
assertThrows(function() { iter.throw(new Sentinel); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test5(instantiate(g));
function Test6(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
var exn = new Sentinel;
assertIteratorResult(exn, false, iter.throw(exn));
assertThrows(function() { iter.throw(new Sentinel); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test6(instantiate(g));
function Test7(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
assertIteratorResult(3, false, iter.next());
assertIteratorIsClosed(iter);
}
Test7(instantiate(g));
}
TestTryCatch(function (g) { return g(); });
TestTryCatch(function* (g) { return yield* g(); });
function TestTryFinally(instantiate) {
function* g() { yield 1; try { yield 2; } finally { yield 3; } yield 4; }
function Sentinel() {}
function Sentinel2() {}
function Test1(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
assertIteratorResult(3, false, iter.next());
assertIteratorResult(4, false, iter.next());
assertIteratorIsClosed(iter);
}
Test1(instantiate(g));
function Test2(iter) {
assertThrows(function() { iter.throw(new Sentinel); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test2(instantiate(g));
function Test3(iter) {
assertIteratorResult(1, false, iter.next());
assertThrows(function() { iter.throw(new Sentinel); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test3(instantiate(g));
function Test4(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
assertIteratorResult(3, false, iter.throw(new Sentinel));
assertThrows(function() { iter.next(); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test4(instantiate(g));
function Test5(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
assertIteratorResult(3, false, iter.throw(new Sentinel));
assertThrows(function() { iter.throw(new Sentinel2); }, Sentinel2);
assertThrownIteratorIsClosed(iter);
}
Test5(instantiate(g));
function Test6(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
assertIteratorResult(3, false, iter.next());
assertThrows(function() { iter.throw(new Sentinel); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test6(instantiate(g));
function Test7(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
assertIteratorResult(3, false, iter.next());
assertIteratorResult(4, false, iter.next());
assertThrows(function() { iter.throw(new Sentinel); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test7(instantiate(g));
function Test8(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
assertIteratorResult(3, false, iter.next());
assertIteratorResult(4, false, iter.next());
assertIteratorIsClosed(iter);
}
Test8(instantiate(g));
}
TestTryFinally(function (g) { return g(); });
TestTryFinally(function* (g) { return yield* g(); });
function TestNestedTry(instantiate) {
function* g() {
try {
yield 1;
try { yield 2; } catch (e) { yield e; }
yield 3;
} finally {
yield 4;
}
yield 5;
}
function Sentinel() {}
function Sentinel2() {}
function Test1(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
assertIteratorResult(3, false, iter.next());
assertIteratorResult(4, false, iter.next());
assertIteratorResult(5, false, iter.next());
assertIteratorIsClosed(iter);
}
Test1(instantiate(g));
function Test2(iter) {
assertThrows(function() { iter.throw(new Sentinel); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test2(instantiate(g));
function Test3(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(4, false, iter.throw(new Sentinel));
assertThrows(function() { iter.next(); }, Sentinel);
assertThrownIteratorIsClosed(iter);
}
Test3(instantiate(g));
function Test4(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(4, false, iter.throw(new Sentinel));
assertThrows(function() { iter.throw(new Sentinel2); }, Sentinel2);
assertThrownIteratorIsClosed(iter);
}
Test4(instantiate(g));
function Test5(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
var exn = new Sentinel;
assertIteratorResult(exn, false, iter.throw(exn));
assertIteratorResult(3, false, iter.next());
assertIteratorResult(4, false, iter.next());
assertIteratorResult(5, false, iter.next());
assertIteratorIsClosed(iter);
}
Test5(instantiate(g));
function Test6(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
var exn = new Sentinel;
assertIteratorResult(exn, false, iter.throw(exn));
assertIteratorResult(4, false, iter.throw(new Sentinel2));
assertThrows(function() { iter.next(); }, Sentinel2);
assertThrownIteratorIsClosed(iter);
}
Test6(instantiate(g));
function Test7(iter) {
assertIteratorResult(1, false, iter.next());
assertIteratorResult(2, false, iter.next());
var exn = new Sentinel;
assertIteratorResult(exn, false, iter.throw(exn));
assertIteratorResult(3, false, iter.next());
assertIteratorResult(4, false, iter.throw(new Sentinel2));
assertThrows(function() { iter.next(); }, Sentinel2);
assertThrownIteratorIsClosed(iter);
}
Test7(instantiate(g));
// That's probably enough.
}
TestNestedTry(function (g) { return g(); });
TestNestedTry(function* (g) { return yield* g(); });
function TestRecursion() {
function TestNextRecursion() {
function* g() { yield iter.next(); }
var iter = g();
return iter.next();
}
function TestSendRecursion() {
function* g() { yield iter.next(42); }
var iter = g();
return iter.next();
}
function TestThrowRecursion() {
function* g() { yield iter.throw(1); }
var iter = g();
return iter.next();
}
assertThrows(TestNextRecursion, Error);
assertThrows(TestSendRecursion, Error);
assertThrows(TestThrowRecursion, Error);
}
TestRecursion();