You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

85 lines
2.3 KiB

// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_TYPING_H_
#define V8_TYPING_H_
#include "src/v8.h"
#include "src/allocation.h"
#include "src/ast.h"
#include "src/effects.h"
#include "src/scopes.h"
#include "src/type-info.h"
#include "src/types.h"
#include "src/zone.h"
namespace v8 {
namespace internal {
class AstTyper: public AstVisitor {
public:
static void Run(CompilationInfo* info);
void* operator new(size_t size, Zone* zone) { return zone->New(size); }
void operator delete(void* pointer, Zone* zone) { }
void operator delete(void* pointer) { }
DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
private:
explicit AstTyper(CompilationInfo* info);
Effect ObservedOnStack(Object* value);
void ObserveTypesAtOsrEntry(IterationStatement* stmt);
static const int kNoVar = INT_MIN;
typedef v8::internal::Effects<int, kNoVar> Effects;
typedef v8::internal::NestedEffects<int, kNoVar> Store;
CompilationInfo* info_;
TypeFeedbackOracle oracle_;
Store store_;
TypeFeedbackOracle* oracle() { return &oracle_; }
void NarrowType(Expression* e, Bounds b) {
e->set_bounds(Bounds::Both(e->bounds(), b, zone()));
}
void NarrowLowerType(Expression* e, Type* t) {
e->set_bounds(Bounds::NarrowLower(e->bounds(), t, zone()));
}
Effects EnterEffects() {
store_ = store_.Push();
return store_.Top();
}
void ExitEffects() { store_ = store_.Pop(); }
int parameter_index(int index) { return -index - 2; }
int stack_local_index(int index) { return index; }
int variable_index(Variable* var) {
// Stack locals have the range [0 .. l]
// Parameters have the range [-1 .. p]
// We map this to [-p-2 .. -1, 0 .. l]
return var->IsStackLocal() ? stack_local_index(var->index()) :
var->IsParameter() ? parameter_index(var->index()) : kNoVar;
}
void VisitDeclarations(ZoneList<Declaration*>* declarations) OVERRIDE;
void VisitStatements(ZoneList<Statement*>* statements) OVERRIDE;
#define DECLARE_VISIT(type) virtual void Visit##type(type* node) OVERRIDE;
AST_NODE_LIST(DECLARE_VISIT)
#undef DECLARE_VISIT
DISALLOW_COPY_AND_ASSIGN(AstTyper);
};
} } // namespace v8::internal
#endif // V8_TYPING_H_