kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 1 | // Copyright 2006-2009 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #ifndef V8_FUNC_NAME_INFERRER_H_ |
| 29 | #define V8_FUNC_NAME_INFERRER_H_ |
| 30 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 31 | namespace v8 { |
| 32 | namespace internal { |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 33 | |
| 34 | // FuncNameInferrer is a stateful class that is used to perform name |
| 35 | // inference for anonymous functions during static analysis of source code. |
| 36 | // Inference is performed in cases when an anonymous function is assigned |
| 37 | // to a variable or a property (see test-func-name-inference.cc for examples.) |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 38 | // |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 39 | // The basic idea is that during parsing of LHSs of certain expressions |
| 40 | // (assignments, declarations, object literals) we collect name strings, |
| 41 | // and during parsing of the RHS, a function literal can be collected. After |
| 42 | // parsing the RHS we can infer a name for function literals that do not have |
| 43 | // a name. |
| 44 | class FuncNameInferrer : public ZoneObject { |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 45 | public: |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 46 | FuncNameInferrer() |
| 47 | : entries_stack_(10), |
| 48 | names_stack_(5), |
| 49 | funcs_to_infer_(4), |
| 50 | dot_(Factory::NewStringFromAscii(CStrVector("."))) { |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 51 | } |
| 52 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 53 | // Returns whether we have entered name collection state. |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 54 | bool IsOpen() const { return !entries_stack_.is_empty(); } |
| 55 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 56 | // Pushes an enclosing the name of enclosing function onto names stack. |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 57 | void PushEnclosingName(Handle<String> name); |
| 58 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 59 | // Enters name collection state. |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 60 | void Enter() { |
| 61 | entries_stack_.Add(names_stack_.length()); |
| 62 | } |
| 63 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 64 | // Pushes an encountered name onto names stack when in collection state. |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 65 | void PushLiteralName(Handle<String> name); |
| 66 | |
| 67 | void PushVariableName(Handle<String> name); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 68 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 69 | // Adds a function to infer name for. |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 70 | void AddFunction(FunctionLiteral* func_to_infer) { |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 71 | if (IsOpen()) { |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 72 | funcs_to_infer_.Add(func_to_infer); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 73 | } |
| 74 | } |
| 75 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 76 | // Infers a function name and leaves names collection state. |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 77 | void Infer() { |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 78 | ASSERT(IsOpen()); |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 79 | if (!funcs_to_infer_.is_empty()) { |
| 80 | InferFunctionsNames(); |
| 81 | } |
ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | // Infers a function name and leaves names collection state. |
| 85 | void Leave() { |
| 86 | ASSERT(IsOpen()); |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 87 | names_stack_.Rewind(entries_stack_.RemoveLast()); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | private: |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 91 | // Constructs a full name in dotted notation from gathered names. |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 92 | Handle<String> MakeNameFromStack(); |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 93 | |
| 94 | // A helper function for MakeNameFromStack. |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 95 | Handle<String> MakeNameFromStackHelper(int pos, Handle<String> prev); |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 96 | |
| 97 | // Performs name inferring for added functions. |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 98 | void InferFunctionsNames(); |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 99 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 100 | ZoneList<int> entries_stack_; |
| 101 | ZoneList<Handle<String> > names_stack_; |
| 102 | ZoneList<FunctionLiteral*> funcs_to_infer_; |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 103 | Handle<String> dot_; |
| 104 | |
| 105 | DISALLOW_COPY_AND_ASSIGN(FuncNameInferrer); |
| 106 | }; |
| 107 | |
| 108 | |
kasperl@chromium.org | d1e3e72 | 2009-04-14 13:38:25 +0000 | [diff] [blame] | 109 | } } // namespace v8::internal |
| 110 | |
| 111 | #endif // V8_FUNC_NAME_INFERRER_H_ |