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472c898c87
Dart for-in loops allow `var x = [1]; for (var x in x) {}`, which is not
allowed in JS. If this pattern is detected, a temporary variable is
introduced so the for-in initializer expression is evaluated outside of
the JS for-of loop.
(This issue seems to be unique to for-in loops. For loops and other
kinds of variable declarations of the form `var x = ...` are not
allowed to use `x` in the initializer, even if `x` is declared in an
outer scope.)
Also fixes an out-of-date comment in the DDC+Analyzer backend.
Change-Id: I35b272a5a311f7b6f104cc82a99cc83a6ed5c247
Reviewed-on: https://dart-review.googlesource.com/c/79142
Commit-Queue: Alan Knight <alanknight@google.com>
Auto-Submit: Jenny Messerly <jmesserly@google.com>
Reviewed-by: Alan Knight <alanknight@google.com>
91 lines
1.9 KiB
Dart
91 lines
1.9 KiB
Dart
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Dart test program for testing for statement.
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import "package:expect/expect.dart";
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class Helper {
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static int f1() {
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for (;;) return 1;
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}
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static int f2(var n) {
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int i = 0;
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for (; i < n; i++);
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return i;
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}
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static int f3(int n) {
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int i = 0;
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for (int j = 0; j < n; j++) i = i + j + 1;
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return i;
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}
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static int f4(n) {
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int i = 0;
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for (bool stop = false; (i < n) && !stop; i++) {
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if (i >= 5) {
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stop = true;
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}
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}
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return i;
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}
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static var status;
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static void f5() {
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status = 0;
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for (var stop = false;;) {
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if (stop) {
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break;
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} else {
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stop = true;
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continue;
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}
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}
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status = 1;
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}
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static int f6() {
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// Verify that side effects in the condition are visible after the loop.
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int i = 0;
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for (; ++i < 3;) {}
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return i;
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}
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}
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class ForTest {
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static testMain() {
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Expect.equals(1, Helper.f1());
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Expect.equals(0, Helper.f2(-1));
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Expect.equals(0, Helper.f2(0));
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Expect.equals(10, Helper.f2(10));
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Expect.equals(0, Helper.f3(-1));
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Expect.equals(0, Helper.f3(0));
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Expect.equals(1, Helper.f3(1));
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Expect.equals(3, Helper.f3(2));
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Expect.equals(6, Helper.f3(3));
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Expect.equals(10, Helper.f3(4));
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Expect.equals(0, Helper.f4(-1));
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Expect.equals(0, Helper.f4(0));
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Expect.equals(1, Helper.f4(1));
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Expect.equals(6, Helper.f4(6));
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Expect.equals(6, Helper.f4(10));
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Helper.f5();
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Expect.equals(1, Helper.status);
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Expect.equals(3, Helper.f6());
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}
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}
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main() {
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ForTest.testMain();
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testShadowLocal();
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}
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void testShadowLocal() {
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List<int> x = [1, 2, 3];
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for (var x = x;;) break; //# 01: compile-time error
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}
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