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1 // Copyright 2006-2009 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2009 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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38 // Inference is performed in cases when an anonymous function is assigned | 38 // Inference is performed in cases when an anonymous function is assigned |
39 // to a variable or a property (see test-func-name-inference.cc for examples.) | 39 // to a variable or a property (see test-func-name-inference.cc for examples.) |
40 // | 40 // |
41 // The basic idea is that during parsing of LHSs of certain expressions | 41 // The basic idea is that during parsing of LHSs of certain expressions |
42 // (assignments, declarations, object literals) we collect name strings, | 42 // (assignments, declarations, object literals) we collect name strings, |
43 // and during parsing of the RHS, a function literal can be collected. After | 43 // and during parsing of the RHS, a function literal can be collected. After |
44 // parsing the RHS we can infer a name for function literals that do not have | 44 // parsing the RHS we can infer a name for function literals that do not have |
45 // a name. | 45 // a name. |
46 class FuncNameInferrer : public ZoneObject { | 46 class FuncNameInferrer : public ZoneObject { |
47 public: | 47 public: |
48 explicit FuncNameInferrer(Isolate* isolate); | 48 FuncNameInferrer(Isolate* isolate, Zone* zone); |
49 | 49 |
50 // Returns whether we have entered name collection state. | 50 // Returns whether we have entered name collection state. |
51 bool IsOpen() const { return !entries_stack_.is_empty(); } | 51 bool IsOpen() const { return !entries_stack_.is_empty(); } |
52 | 52 |
53 // Pushes an enclosing the name of enclosing function onto names stack. | 53 // Pushes an enclosing the name of enclosing function onto names stack. |
54 void PushEnclosingName(Handle<String> name); | 54 void PushEnclosingName(Handle<String> name); |
55 | 55 |
56 // Enters name collection state. | 56 // Enters name collection state. |
57 void Enter() { | 57 void Enter() { |
58 entries_stack_.Add(names_stack_.length()); | 58 entries_stack_.Add(names_stack_.length(), zone()); |
59 } | 59 } |
60 | 60 |
61 // Pushes an encountered name onto names stack when in collection state. | 61 // Pushes an encountered name onto names stack when in collection state. |
62 void PushLiteralName(Handle<String> name); | 62 void PushLiteralName(Handle<String> name); |
63 | 63 |
64 void PushVariableName(Handle<String> name); | 64 void PushVariableName(Handle<String> name); |
65 | 65 |
66 // Adds a function to infer name for. | 66 // Adds a function to infer name for. |
67 void AddFunction(FunctionLiteral* func_to_infer) { | 67 void AddFunction(FunctionLiteral* func_to_infer) { |
68 if (IsOpen()) { | 68 if (IsOpen()) { |
69 funcs_to_infer_.Add(func_to_infer); | 69 funcs_to_infer_.Add(func_to_infer, zone()); |
70 } | 70 } |
71 } | 71 } |
72 | 72 |
73 void RemoveLastFunction() { | 73 void RemoveLastFunction() { |
74 if (IsOpen() && !funcs_to_infer_.is_empty()) { | 74 if (IsOpen() && !funcs_to_infer_.is_empty()) { |
75 funcs_to_infer_.RemoveLast(); | 75 funcs_to_infer_.RemoveLast(); |
76 } | 76 } |
77 } | 77 } |
78 | 78 |
79 // Infers a function name and leaves names collection state. | 79 // Infers a function name and leaves names collection state. |
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98 kLiteralName, | 98 kLiteralName, |
99 kVariableName | 99 kVariableName |
100 }; | 100 }; |
101 struct Name { | 101 struct Name { |
102 Name(Handle<String> name, NameType type) : name(name), type(type) { } | 102 Name(Handle<String> name, NameType type) : name(name), type(type) { } |
103 Handle<String> name; | 103 Handle<String> name; |
104 NameType type; | 104 NameType type; |
105 }; | 105 }; |
106 | 106 |
107 Isolate* isolate() { return isolate_; } | 107 Isolate* isolate() { return isolate_; } |
| 108 Zone* zone() { return zone_; } |
108 | 109 |
109 // Constructs a full name in dotted notation from gathered names. | 110 // Constructs a full name in dotted notation from gathered names. |
110 Handle<String> MakeNameFromStack(); | 111 Handle<String> MakeNameFromStack(); |
111 | 112 |
112 // A helper function for MakeNameFromStack. | 113 // A helper function for MakeNameFromStack. |
113 Handle<String> MakeNameFromStackHelper(int pos, Handle<String> prev); | 114 Handle<String> MakeNameFromStackHelper(int pos, Handle<String> prev); |
114 | 115 |
115 // Performs name inferring for added functions. | 116 // Performs name inferring for added functions. |
116 void InferFunctionsNames(); | 117 void InferFunctionsNames(); |
117 | 118 |
118 Isolate* isolate_; | 119 Isolate* isolate_; |
119 ZoneList<int> entries_stack_; | 120 ZoneList<int> entries_stack_; |
120 ZoneList<Name> names_stack_; | 121 ZoneList<Name> names_stack_; |
121 ZoneList<FunctionLiteral*> funcs_to_infer_; | 122 ZoneList<FunctionLiteral*> funcs_to_infer_; |
| 123 Zone* zone_; |
122 | 124 |
123 DISALLOW_COPY_AND_ASSIGN(FuncNameInferrer); | 125 DISALLOW_COPY_AND_ASSIGN(FuncNameInferrer); |
124 }; | 126 }; |
125 | 127 |
126 | 128 |
127 } } // namespace v8::internal | 129 } } // namespace v8::internal |
128 | 130 |
129 #endif // V8_FUNC_NAME_INFERRER_H_ | 131 #endif // V8_FUNC_NAME_INFERRER_H_ |
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