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Side by Side Diff: src/usage-analyzer.cc

Issue 1935: New static flags system (Closed)
Patch Set: Merge, again. Created 12 years, 3 months ago
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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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