1// Copyright 2013 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_TYPING_H_
6#define V8_TYPING_H_
7
8#include "src/v8.h"
9
10#include "src/allocation.h"
11#include "src/ast.h"
12#include "src/compiler.h"
13#include "src/effects.h"
14#include "src/scopes.h"
15#include "src/type-info.h"
16#include "src/types.h"
17#include "src/zone.h"
18
19namespace v8 {
20namespace internal {
21
22
23class AstTyper: public AstVisitor {
24 public:
25  static void Run(CompilationInfo* info);
26
27  void* operator new(size_t size, Zone* zone) {
28    return zone->New(static_cast<int>(size));
29  }
30  void operator delete(void* pointer, Zone* zone) { }
31  void operator delete(void* pointer) { }
32
33  DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
34
35 private:
36  explicit AstTyper(CompilationInfo* info);
37
38  Effect ObservedOnStack(Object* value);
39  void ObserveTypesAtOsrEntry(IterationStatement* stmt);
40
41  static const int kNoVar = INT_MIN;
42  typedef v8::internal::Effects<int, kNoVar> Effects;
43  typedef v8::internal::NestedEffects<int, kNoVar> Store;
44
45  CompilationInfo* info_;
46  TypeFeedbackOracle oracle_;
47  Store store_;
48
49  TypeFeedbackOracle* oracle() { return &oracle_; }
50
51  void NarrowType(Expression* e, Bounds b) {
52    e->set_bounds(Bounds::Both(e->bounds(), b, zone()));
53  }
54  void NarrowLowerType(Expression* e, Type* t) {
55    e->set_bounds(Bounds::NarrowLower(e->bounds(), t, zone()));
56  }
57
58  Effects EnterEffects() {
59    store_ = store_.Push();
60    return store_.Top();
61  }
62  void ExitEffects() { store_ = store_.Pop(); }
63
64  int parameter_index(int index) { return -index - 2; }
65  int stack_local_index(int index) { return index; }
66
67  int variable_index(Variable* var) {
68    // Stack locals have the range [0 .. l]
69    // Parameters have the range [-1 .. p]
70    // We map this to [-p-2 .. -1, 0 .. l]
71    return var->IsStackLocal() ? stack_local_index(var->index()) :
72           var->IsParameter() ? parameter_index(var->index()) : kNoVar;
73  }
74
75  void VisitDeclarations(ZoneList<Declaration*>* declarations);
76  void VisitStatements(ZoneList<Statement*>* statements);
77
78#define DECLARE_VISIT(type) virtual void Visit##type(type* node);
79  AST_NODE_LIST(DECLARE_VISIT)
80#undef DECLARE_VISIT
81
82  DISALLOW_COPY_AND_ASSIGN(AstTyper);
83};
84
85} }  // namespace v8::internal
86
87#endif  // V8_TYPING_H_
88