// Copyright 2012 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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#ifndef V8_DEBUG_LIVEEDIT_H_
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#define V8_DEBUG_LIVEEDIT_H_
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#include <vector>
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#include "src/globals.h"
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#include "src/handles.h"
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namespace v8 {
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namespace debug {
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struct LiveEditResult;
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}
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namespace internal {
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class Script;
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class String;
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class Debug;
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class JavaScriptFrame;
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struct SourceChangeRange {
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int start_position;
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int end_position;
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int new_start_position;
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int new_end_position;
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};
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/**
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Liveedit step-by-step:
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1. calculate diff between old source and new source,
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2. map function literals from old source to new source,
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3. create new script for new_source,
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4. mark literals with changed code as changed, all others as unchanged,
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5. check that for changed literals there are no:
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- running generators in the heap,
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- non droppable frames (e.g. running generator) above them on stack.
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6. mark the bottom most frame with changed function as scheduled for restart
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if any,
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7. for unchanged functions:
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- deoptimize,
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- remove from cache,
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- update source positions,
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- move to new script,
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- reset feedback information and preparsed scope information if any,
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- replace any sfi in constant pool with changed one if any.
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8. for changed functions:
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- deoptimize
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- remove from cache,
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- reset feedback information,
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- update all links from js functions to old shared with new one.
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9. swap scripts.
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*/
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class LiveEdit : AllStatic {
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public:
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static void InitializeThreadLocal(Debug* debug);
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// Restarts the call frame and completely drops all frames above it.
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static bool RestartFrame(JavaScriptFrame* frame);
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static void CompareStrings(Isolate* isolate, Handle<String> a,
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Handle<String> b,
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std::vector<SourceChangeRange>* diffs);
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static int TranslatePosition(const std::vector<SourceChangeRange>& changed,
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int position);
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static void PatchScript(Isolate* isolate, Handle<Script> script,
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Handle<String> source, bool preview,
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debug::LiveEditResult* result);
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// Architecture-specific constant.
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static const bool kFrameDropperSupported;
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_DEBUG_LIVEEDIT_H_
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