data-flow.h revision 4515c472dc3e5ed2448a564600976759e569a0a8 
1// Copyright 2010 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//
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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
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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
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15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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27
28#ifndef V8_DATAFLOW_H_
29#define V8_DATAFLOW_H_
30
31#include "ast.h"
32#include "scopes.h"
33
34namespace v8 {
35namespace internal {
36
37// This class is used to number all expressions in the AST according to
38// their evaluation order (post-order left-to-right traversal).
39class AstLabeler: public AstVisitor {
40 public:
41  AstLabeler() : next_number_(0), has_this_properties_(false) {}
42
43  void Label(FunctionLiteral* fun);
44
45  bool has_this_properties() { return has_this_properties_; }
46
47 private:
48  void VisitDeclarations(ZoneList<Declaration*>* decls);
49  void VisitStatements(ZoneList<Statement*>* stmts);
50
51  // AST node visit functions.
52#define DECLARE_VISIT(type) virtual void Visit##type(type* node);
53  AST_NODE_LIST(DECLARE_VISIT)
54#undef DECLARE_VISIT
55
56  // Traversal number for labelling AST nodes.
57  int next_number_;
58
59  bool has_this_properties_;
60
61  DISALLOW_COPY_AND_ASSIGN(AstLabeler);
62};
63
64
65} }  // namespace v8::internal
66
67#endif  // V8_DATAFLOW_H_
68