08f68102f8
Declare Variables with a name and position, rather than by passing through a VariableProxy. This allows us to not create dummy proxies for things like function declarations, and allows us to consider those declarations unused. As a side-effect, we also have to check if a variable is unused in the bytecode generator (as it will no longer be allocated), and we end up skip generating code/SFIs for dead variables/functions. Change-Id: I4c2c872473f23e124f9456b4b92f87159658f8e0 Reviewed-on: https://chromium-review.googlesource.com/c/1414916 Commit-Queue: Leszek Swirski <leszeks@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Reviewed-by: Toon Verwaest <verwaest@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Cr-Commit-Position: refs/heads/master@{#59088}
36 lines
915 B
JavaScript
36 lines
915 B
JavaScript
// Copyright 2019 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --no-always-opt --no-stress-opt
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Debug = debug.Debug
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var exception = null;
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function listener(event, exec_state, event_data, data) {
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if (event != Debug.DebugEvent.Break) return;
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try {
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// Evaluating the live function should succeed.
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assertEquals(exec_state.frame(0).evaluate("live()").value(), 1);
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// Evaluating the dead function should fail.
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assertThrows(()=>exec_state.frame(0).evaluate("dead()"), ReferenceError);
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} catch (e) {
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exception = e;
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print(e + e.stack);
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}
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}
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Debug.setListener(listener);
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(function() {
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"use strict";
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function live() { return 1; }
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function dead() { return 2; }
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// Use 'foo' to make it non-dead.
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live;
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debugger;
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})();
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Debug.setListener(null);
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assertNull(exception);
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