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+// Copyright 2010 the V8 project authors. All rights reserved. |
+// Redistribution and use in source and binary forms, with or without |
+// modification, are permitted provided that the following conditions are |
+// met: |
+// |
+// * Redistributions of source code must retain the above copyright |
+// notice, this list of conditions and the following disclaimer. |
+// * Redistributions in binary form must reproduce the above |
+// copyright notice, this list of conditions and the following |
+// disclaimer in the documentation and/or other materials provided |
+// with the distribution. |
+// * Neither the name of Google Inc. nor the names of its |
+// contributors may be used to endorse or promote products derived |
+// from this software without specific prior written permission. |
+// |
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
+ |
+#ifndef V8_LIVEEDIT_H_ |
+#define V8_LIVEEDIT_H_ |
+ |
+ |
+ |
+// Live Edit feature implementation. |
+// User should be able to change script on already running VM. This feature |
+// matches hot swap features in other frameworks. |
+// |
+// The basic use-case is when user spots some mistake in function body |
+// from debugger and wishes to change the algorithm without restart. |
+// |
+// A single change always has a form of a simple replacement (in pseudo-code): |
+// script.source[positions, positions+length] = new_string; |
+// Implementation first determines, which function's body includes this |
+// change area. Then both old and new versions of script are fully compiled |
+// in order to analyze, whether the function changed its outer scope |
+// expectations (or number of parameters). If it didn't, function's code is |
+// patched with a newly compiled code. If it did change, enclosing function |
+// gets patched. All inner functions are left untouched, whatever happened |
+// to them in a new script version. However, new version of code will |
+// instantiate newly compiled functions. |
+ |
+ |
+#include "compiler.h" |
+ |
+namespace v8 { |
+namespace internal { |
+ |
+// This class collects some specific information on structure of functions |
+// in a particular script. It gets called from compiler all the time, but |
+// actually records any data only when liveedit operation is in process; |
+// in any other time this class is very cheap. |
+// |
+// The primary interest of the Tracker is to record function scope structures |
+// in order to analyze whether function code maybe safely patched (with new |
+// code successfully reading existing data from function scopes). The Tracker |
+// also collects compiled function codes. |
+class LiveEditFunctionTracker { |
+ public: |
+ LiveEditFunctionTracker(FunctionLiteral* fun); |
+ ~LiveEditFunctionTracker(); |
+ void RecordFunctionCode(Handle<Code> code); |
+ void RecordFunctionScope(Scope* scope); |
+ |
+ static bool IsActive(); |
+}; |
+ |
+} } // namespace v8::internal |
+ |
+#endif /* V*_LIVEEDIT_H_ */ |