js/src/jit/TypeData.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: set ts=8 sts=2 et sw=2 tw=80:
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef jit_TypeData_h
   8 #define jit_TypeData_h
   9
  10 #include "js/Value.h"
  11
  12 namespace js {
  13 namespace jit {
  14
  15 class TypeData {
  16   JSValueType type_;
  17
  18  public:
  19   TypeData() : type_(JSVAL_TYPE_UNKNOWN) {}
  20   explicit TypeData(JSValueType type) : type_(type) {}
  21
  22   JSValueType type() const { return type_; }
  23   bool hasData() const { return type_ != JSVAL_TYPE_UNKNOWN; }
  24 };
  25
  26 class TypeDataList {
  27   const static size_t MaxLength = 6;
  28
  29   uint8_t count_ = 0;
  30   TypeData typeData_[MaxLength];
  31
  32  public:
  33   TypeDataList() {}
  34
  35   uint8_t count() const { return count_; }
  36
  37   void addTypeData(TypeData data) {
  38     MOZ_ASSERT(count_ < MaxLength);
  39     MOZ_ASSERT(!typeData_[count_].hasData());
  40     typeData_[count_++] = data;
  41   }
  42   TypeData get(uint32_t idx) const {
  43     MOZ_ASSERT(idx < count_);
  44     return typeData_[idx];
  45   }
  46
  47   const TypeData* begin() const { return &typeData_[0]; }
  48   const TypeData* end() const { return begin() + count_; }
  49 };
  50
  51 }  // namespace jit
  52 }  // namespace js
  53
  54 #endif /* jit_TypeData_h */