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| 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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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| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | 27 |
| 28 #include "v8.h" | 28 #include "v8.h" |
| 29 | 29 |
| 30 #include "ast.h" | 30 #include "ast.h" |
| 31 #include "scopes.h" | 31 #include "scopes.h" |
| 32 #include "usage-analyzer.h" | 32 #include "usage-analyzer.h" |
| 33 | 33 |
| 34 namespace v8 { namespace internal { | 34 namespace v8 { namespace internal { |
| 35 | 35 |
| 36 DEFINE_bool(usage_computation, true, "compute variable usage counts"); | |
| 37 | |
| 38 // Weight boundaries | 36 // Weight boundaries |
| 39 static const int MinWeight = 1; | 37 static const int MinWeight = 1; |
| 40 static const int MaxWeight = 1000000; | 38 static const int MaxWeight = 1000000; |
| 41 static const int InitialWeight = 100; | 39 static const int InitialWeight = 100; |
| 42 | 40 |
| 43 | 41 |
| 44 class UsageComputer: public Visitor { | 42 class UsageComputer: public Visitor { |
| 45 public: | 43 public: |
| 46 static bool Traverse(Node* node); | 44 static bool Traverse(Node* node); |
| 47 | 45 |
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| 436 | 434 |
| 437 // ---------------------------------------------------------------------------- | 435 // ---------------------------------------------------------------------------- |
| 438 // Interface to variable usage analysis | 436 // Interface to variable usage analysis |
| 439 | 437 |
| 440 bool AnalyzeVariableUsage(FunctionLiteral* lit) { | 438 bool AnalyzeVariableUsage(FunctionLiteral* lit) { |
| 441 if (!FLAG_usage_computation) return true; | 439 if (!FLAG_usage_computation) return true; |
| 442 return UsageComputer::Traverse(lit); | 440 return UsageComputer::Traverse(lit); |
| 443 } | 441 } |
| 444 | 442 |
| 445 } } // namespace v8::internal | 443 } } // namespace v8::internal |
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