5505c66446
This is a reland of 3dfaf8264f
Original change's description:
> [debug] liveedit in native
>
> Liveedit step-by-step:
> 1. calculate diff between old source and new source,
> 2. map function literals from old source to new source,
> 3. create new script for new_source,
> 4. mark literals with changed code as changed, all others as unchanged,
> 5. check that for changed literals there are no:
> - running generators in the heap,
> - non droppable frames (e.g. running generator) above them on stack.
> 6. mark the bottom most frame with changed function as scheduled for
> restart if any.
> 7. for unchanged functions:
> - deoptimize,
> - remove from cache,
> - update source positions,
> - move to new script,
> - reset feedback information and preparsed scope information if any,
> - replace any sfi in constant pool with changed one if any.
> 8. for changed functions:
> - deoptimize
> - remove from cache,
> - reset feedback information,
> - update all links from js functions to old shared with new one.
> 9. swap scripts.
>
> TBR=ulan@chromium.org
>
> Bug: v8:7862,v8:5713
> Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;luci.chromium.try:linux_chromium_rel_ng;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: I8f6f6156318cc82d6f36d7ebc1c9f7d5f3aa1461
> Reviewed-on: https://chromium-review.googlesource.com/1105493
> Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
> Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54146}
TBR=dgozman@chromium.org
Bug: v8:7862, v8:5713
Change-Id: I163ed2fd2ca3115ba0de74cb35a6fac9e40fdd94
Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;luci.chromium.try:linux_chromium_rel_ng;master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/1124879
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54187}
74 lines
1.8 KiB
JavaScript
74 lines
1.8 KiB
JavaScript
// Copyright 2015 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: --allow-natives-syntax
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Debug = debug.Debug
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function BestEditor() {
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return 'Emacs';
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}
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var exception = null;
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var results = [];
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var log = []
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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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var source_line = event_data.sourceLineText();
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log.push(source_line);
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if (source_line.indexOf("return") >= 0) {
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switch (results.length) {
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case 0:
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break;
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case 1:
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Replace(BestEditor, "Emacs", "Eclipse");
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break;
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case 2:
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Replace(BestEditor, "Eclipse", "Vim");
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break;
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default:
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assertUnreachable();
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}
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}
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exec_state.prepareStep(Debug.StepAction.StepIn);
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} catch (e) {
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exception = e;
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}
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};
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function Replace(fun, original, patch) {
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if (fun.toString().indexOf(original) < 0) return;
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%LiveEditPatchScript(fun, Debug.scriptSource(fun).replace(original, patch));
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}
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Debug.setListener(listener);
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debugger;
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results.push(BestEditor());
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results.push(BestEditor());
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results.push(BestEditor());
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Debug.setListener(null);
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assertNull(exception);
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assertEquals(["Emacs", "Eclipse", "Vim"], results);
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assertEquals([
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"debugger;",
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"results.push(BestEditor());",
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" return 'Emacs';",
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" return 'Emacs';",
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"results.push(BestEditor());",
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"results.push(BestEditor());",
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" return 'Emacs';",
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" return 'Eclipse';",
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" return 'Eclipse';",
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"results.push(BestEditor());",
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"results.push(BestEditor());",
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" return 'Eclipse';",
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" return 'Vim';",
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" return 'Vim';",
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"results.push(BestEditor());",
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"Debug.setListener(null);"
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], log);
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