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| 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/allocation.h" | |
| 9 #include "src/ast.h" | |
| 10 #include "src/effects.h" | |
| 11 #include "src/scopes.h" | |
| 12 #include "src/type-info.h" | |
| 13 #include "src/types.h" | |
| 14 #include "src/zone.h" | |
| 15 | |
| 16 namespace v8 { | |
| 17 namespace internal { | |
| 18 | |
| 19 | |
| 20 class AstTyper: public AstVisitor { | |
| 21 public: | |
| 22 AstTyper(Isolate* isolate, Zone* zone, Handle<JSFunction> closure, | |
| 23 Scope* scope, BailoutId osr_ast_id, FunctionLiteral* root); | |
| 24 void Run(); | |
| 25 | |
| 26 DEFINE_AST_VISITOR_SUBCLASS_MEMBERS(); | |
| 27 | |
| 28 private: | |
| 29 Effect ObservedOnStack(Object* value); | |
| 30 void ObserveTypesAtOsrEntry(IterationStatement* stmt); | |
| 31 | |
| 32 static const int kNoVar = INT_MIN; | |
| 33 typedef v8::internal::Effects<int, kNoVar> Effects; | |
| 34 typedef v8::internal::NestedEffects<int, kNoVar> Store; | |
| 35 | |
| 36 Isolate* isolate_; | |
| 37 Zone* zone_; | |
| 38 Handle<JSFunction> closure_; | |
| 39 Scope* scope_; | |
| 40 BailoutId osr_ast_id_; | |
| 41 FunctionLiteral* root_; | |
| 42 TypeFeedbackOracle oracle_; | |
| 43 Store store_; | |
| 44 | |
| 45 Zone* zone() const { return zone_; } | |
| 46 TypeFeedbackOracle* oracle() { return &oracle_; } | |
| 47 | |
| 48 void NarrowType(Expression* e, Bounds b) { | |
| 49 e->set_bounds(Bounds::Both(e->bounds(), b, zone())); | |
| 50 } | |
| 51 void NarrowLowerType(Expression* e, Type* t) { | |
| 52 e->set_bounds(Bounds::NarrowLower(e->bounds(), t, zone())); | |
| 53 } | |
| 54 | |
| 55 Effects EnterEffects() { | |
| 56 store_ = store_.Push(); | |
| 57 return store_.Top(); | |
| 58 } | |
| 59 void ExitEffects() { store_ = store_.Pop(); } | |
| 60 | |
| 61 int parameter_index(int index) { return -index - 2; } | |
| 62 int stack_local_index(int index) { return index; } | |
| 63 | |
| 64 int variable_index(Variable* var) { | |
| 65 // Stack locals have the range [0 .. l] | |
| 66 // Parameters have the range [-1 .. p] | |
| 67 // We map this to [-p-2 .. -1, 0 .. l] | |
| 68 return var->IsStackLocal() ? stack_local_index(var->index()) : | |
| 69 var->IsParameter() ? parameter_index(var->index()) : kNoVar; | |
| 70 } | |
| 71 | |
| 72 void VisitDeclarations(ZoneList<Declaration*>* declarations) override; | |
| 73 void VisitStatements(ZoneList<Statement*>* statements) override; | |
| 74 | |
| 75 #define DECLARE_VISIT(type) virtual void Visit##type(type* node) override; | |
| 76 AST_NODE_LIST(DECLARE_VISIT) | |
| 77 #undef DECLARE_VISIT | |
| 78 | |
| 79 DISALLOW_COPY_AND_ASSIGN(AstTyper); | |
| 80 }; | |
| 81 | |
| 82 } // namespace internal | |
| 83 } // namespace v8 | |
| 84 | |
| 85 #endif // V8_TYPING_H_ | |
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