Robert Nystrom
89c7c0b6e0
Change-Id: Icd7ea40455f207eca1dc817ff86823cfabed3de0 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149042 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Leaf Petersen <leafp@google.com>
79 lines
1.7 KiB
Dart
79 lines
1.7 KiB
Dart
// Copyright (c) 2012, 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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import "package:expect/expect.dart";
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final x = foo();
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var x2 = foo2();
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var x3 = foo3();
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var x4 = foo4();
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var x5 = foo5();
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final x6 = foo6();
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// Don't allow unlimited recursion to overflow the stack.
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var x7Depth = 0;
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int x7 = (++x7Depth > 10) ? x7Depth : x7 + 1;
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foo() {
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throw "interrupt initialization";
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}
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foo2() {
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x2 = 499;
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throw "interrupt initialization";
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}
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// Don't allow unlimited recursion to overflow the stack.
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var foo3Depth = 0;
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foo3() => (++foo3Depth > 10) ? foo3Depth : x3 + 1;
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foo4() {
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x4 = 498;
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x4 = x4 + 1;
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return x4;
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}
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foo5() {
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x5 = 498;
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x5 = x5 + 1;
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}
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foo6() {
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try {
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return x5 + 1;
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} catch (e) {
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return 499;
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}
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}
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fib(x) {
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if (x is! int) return 0;
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if (x < 2) return x;
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return fib(x - 1) + fib(x - 2);
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}
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main() {
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// If an initializer throws, then accessing it again re-evaluates the
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// initializer.
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Expect.throws(() => fib(x), (e) => e == "interrupt initialization");
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Expect.throws(() => fib(x), (e) => e == "interrupt initialization");
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Expect.throws(() => fib(x), (e) => e == "interrupt initialization");
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Expect.throws(() => fib(x2), (e) => e == "interrupt initialization");
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// The store happened before the throw, so is there now.
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Expect.equals(499, x2);
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// This value means that the initializer did fully call itself recursively.
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Expect.equals(21, x3);
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Expect.equals(499, x4);
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Expect.equals(null, x5);
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Expect.equals(499, x6);
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// This value means that the initializer did fully call itself recursively.
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Expect.equals(21, x7);
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}
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