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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/compiler.h" | 30 #include "src/compiler.h" |
30 | 31 |
31 namespace v8 { | 32 namespace v8 { |
32 namespace internal { | 33 namespace internal { |
33 | 34 |
34 // This class collects some specific information on structure of functions | 35 // This class collects some specific information on structure of functions |
35 // in a particular script. | 36 // in a particular script. |
36 // | 37 // |
37 // The primary interest of the Tracker is to record function scope structures | 38 // The primary interest of the Tracker is to record function scope structures |
38 // in order to analyze whether function code may be safely patched (with new | 39 // in order to analyze whether function code may be safely patched (with new |
39 // code successfully reading existing data from function scopes). The Tracker | 40 // code successfully reading existing data from function scopes). The Tracker |
40 // also collects compiled function codes. | 41 // also collects compiled function codes. |
41 class LiveEditFunctionTracker : public AstTraversalVisitor { | 42 class LiveEditFunctionTracker |
| 43 : public AstTraversalVisitor<LiveEditFunctionTracker> { |
42 public: | 44 public: |
43 // Traverses the entire AST, and records information about all | 45 // Traverses the entire AST, and records information about all |
44 // FunctionLiterals for further use by LiveEdit code patching. The collected | 46 // FunctionLiterals for further use by LiveEdit code patching. The collected |
45 // information is returned as a serialized array. | 47 // information is returned as a serialized array. |
46 static Handle<JSArray> Collect(FunctionLiteral* node, Handle<Script> script, | 48 static Handle<JSArray> Collect(FunctionLiteral* node, Handle<Script> script, |
47 Zone* zone, Isolate* isolate); | 49 Zone* zone, Isolate* isolate); |
48 | 50 |
49 virtual ~LiveEditFunctionTracker() {} | 51 protected: |
50 void VisitFunctionLiteral(FunctionLiteral* node) override; | 52 friend AstTraversalVisitor<LiveEditFunctionTracker>; |
| 53 void VisitFunctionLiteral(FunctionLiteral* node); |
51 | 54 |
52 private: | 55 private: |
53 LiveEditFunctionTracker(Handle<Script> script, Zone* zone, Isolate* isolate); | 56 LiveEditFunctionTracker(Handle<Script> script, Zone* zone, Isolate* isolate); |
54 | 57 |
55 void FunctionStarted(FunctionLiteral* fun); | 58 void FunctionStarted(FunctionLiteral* fun); |
56 void FunctionDone(Handle<SharedFunctionInfo> shared, Scope* scope); | 59 void FunctionDone(Handle<SharedFunctionInfo> shared, Scope* scope); |
57 Handle<Object> SerializeFunctionScope(Scope* scope); | 60 Handle<Object> SerializeFunctionScope(Scope* scope); |
58 | 61 |
59 Handle<Script> script_; | 62 Handle<Script> script_; |
60 Zone* zone_; | 63 Zone* zone_; |
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370 static const int kSharedInfoOffset_ = 3; | 373 static const int kSharedInfoOffset_ = 3; |
371 static const int kSize_ = 4; | 374 static const int kSize_ = 4; |
372 | 375 |
373 friend class JSArrayBasedStruct<SharedInfoWrapper>; | 376 friend class JSArrayBasedStruct<SharedInfoWrapper>; |
374 }; | 377 }; |
375 | 378 |
376 } // namespace internal | 379 } // namespace internal |
377 } // namespace v8 | 380 } // namespace v8 |
378 | 381 |
379 #endif /* V8_DEBUG_LIVEEDIT_H_ */ | 382 #endif /* V8_DEBUG_LIVEEDIT_H_ */ |
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