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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_DEBUG_LIVEEDIT_H_ | 5 #ifndef V8_DEBUG_LIVEEDIT_H_ |
6 #define V8_DEBUG_LIVEEDIT_H_ | 6 #define V8_DEBUG_LIVEEDIT_H_ |
7 | 7 |
8 | 8 |
9 // Live Edit feature implementation. | 9 // Live Edit feature implementation. |
10 // User should be able to change script on already running VM. This feature | 10 // User should be able to change script on already running VM. This feature |
11 // matches hot swap features in other frameworks. | 11 // matches hot swap features in other frameworks. |
12 // | 12 // |
13 // The basic use-case is when user spots some mistake in function body | 13 // The basic use-case is when user spots some mistake in function body |
14 // from debugger and wishes to change the algorithm without restart. | 14 // from debugger and wishes to change the algorithm without restart. |
15 // | 15 // |
16 // A single change always has a form of a simple replacement (in pseudo-code): | 16 // A single change always has a form of a simple replacement (in pseudo-code): |
17 // script.source[positions, positions+length] = new_string; | 17 // script.source[positions, positions+length] = new_string; |
18 // Implementation first determines, which function's body includes this | 18 // Implementation first determines, which function's body includes this |
19 // change area. Then both old and new versions of script are fully compiled | 19 // change area. Then both old and new versions of script are fully compiled |
20 // in order to analyze, whether the function changed its outer scope | 20 // in order to analyze, whether the function changed its outer scope |
21 // expectations (or number of parameters). If it didn't, function's code is | 21 // expectations (or number of parameters). If it didn't, function's code is |
22 // patched with a newly compiled code. If it did change, enclosing function | 22 // patched with a newly compiled code. If it did change, enclosing function |
23 // gets patched. All inner functions are left untouched, whatever happened | 23 // gets patched. All inner functions are left untouched, whatever happened |
24 // to them in a new script version. However, new version of code will | 24 // to them in a new script version. However, new version of code will |
25 // instantiate newly compiled functions. | 25 // instantiate newly compiled functions. |
26 | 26 |
27 | 27 |
28 #include "src/allocation.h" | 28 #include "src/allocation.h" |
29 #include "src/ast/ast-traversal-visitor.h" | 29 #include "src/ast/ast-traversal-visitor.h" |
30 #include "src/compiler.h" | |
31 | 30 |
32 namespace v8 { | 31 namespace v8 { |
33 namespace internal { | 32 namespace internal { |
34 | 33 |
35 // This class collects some specific information on structure of functions | 34 // This class collects some specific information on structure of functions |
36 // in a particular script. | 35 // in a particular script. |
37 // | 36 // |
38 // The primary interest of the Tracker is to record function scope structures | 37 // The primary interest of the Tracker is to record function scope structures |
39 // in order to analyze whether function code may be safely patched (with new | 38 // in order to analyze whether function code may be safely patched (with new |
40 // code successfully reading existing data from function scopes). The Tracker | 39 // code successfully reading existing data from function scopes). The Tracker |
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364 static const int kSharedInfoOffset_ = 3; | 363 static const int kSharedInfoOffset_ = 3; |
365 static const int kSize_ = 4; | 364 static const int kSize_ = 4; |
366 | 365 |
367 friend class JSArrayBasedStruct<SharedInfoWrapper>; | 366 friend class JSArrayBasedStruct<SharedInfoWrapper>; |
368 }; | 367 }; |
369 | 368 |
370 } // namespace internal | 369 } // namespace internal |
371 } // namespace v8 | 370 } // namespace v8 |
372 | 371 |
373 #endif /* V8_DEBUG_LIVEEDIT_H_ */ | 372 #endif /* V8_DEBUG_LIVEEDIT_H_ */ |
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