Rename NumberInfo to TypeInfo....

src/number-info.h

-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_NUMBER_INFO_H_
-#define V8_NUMBER_INFO_H_
-
-#include "globals.h"
-
-namespace v8 {
-namespace internal {
-
-//        Unknown
-//           |
-//      PrimitiveType
-//           |   \--------|
-//         Number      String
-//         /    |         |
-//    Double  Integer32   |
-//        |      |       /
-//        |     Smi     /
-//        |     /      /
-//        Uninitialized.
-
-class NumberInfo {
- public:
-  NumberInfo() { }
-
-  static inline NumberInfo Unknown();
-  // We know it's a primitive type.
-  static inline NumberInfo Primitive();
-  // We know it's a number of some sort.
-  static inline NumberInfo Number();
-  // We know it's signed or unsigned 32 bit integer.
-  static inline NumberInfo Integer32();
-  // We know it's a Smi.
-  static inline NumberInfo Smi();
-  // We know it's a heap number.
-  static inline NumberInfo Double();
-  // We know it's a string.
-  static inline NumberInfo String();
-  // We haven't started collecting info yet.
-  static inline NumberInfo Uninitialized();
-
-  // Return compact representation.  Very sensitive to enum values below!
-  // Compacting drops information about primtive types and strings types.
-  // We use the compact representation when we only care about number types.
-  int ThreeBitRepresentation() {
-    ASSERT(type_ != kUninitializedType);
-    int answer = type_ & 0xf;
-    answer = answer > 6 ? answer - 2 : answer;
-    ASSERT(answer >= 0);
-    ASSERT(answer <= 7);
-    return answer;
-  }
-
-  // Decode compact representation.  Very sensitive to enum values below!
-  static NumberInfo ExpandedRepresentation(int three_bit_representation) {
-    Type t = static_cast<Type>(three_bit_representation >= 6 ?
-                               three_bit_representation + 2 :
-                               three_bit_representation);
-    t = (t == kUnknownType) ? t : static_cast<Type>(t | kPrimitiveType);
-    ASSERT(t == kUnknownType ||
-           t == kNumberType ||
-           t == kInteger32Type ||
-           t == kSmiType ||
-           t == kDoubleType);
-    return NumberInfo(t);
-  }
-
-  int ToInt() {
-    return type_;
-  }
-
-  static NumberInfo FromInt(int bit_representation) {
-    Type t = static_cast<Type>(bit_representation);
-    ASSERT(t == kUnknownType ||
-           t == kPrimitiveType ||
-           t == kNumberType ||
-           t == kInteger32Type ||
-           t == kSmiType ||
-           t == kDoubleType ||
-           t == kStringType);
-    return NumberInfo(t);
-  }
-
-  // Return the weakest (least precise) common type.
-  static NumberInfo Combine(NumberInfo a, NumberInfo b) {
-    return NumberInfo(static_cast<Type>(a.type_ & b.type_));
-  }
-
-
-  // Integer32 is an integer that can be represented as either a signed
-  // 32-bit integer or as an unsigned 32-bit integer. It has to be
-  // in the range [-2^31, 2^32 - 1]. We also have to check for negative 0
-  // as it is not an Integer32.
-  static inline bool IsInt32Double(double value) {
-    const DoubleRepresentation minus_zero(-0.0);
-    DoubleRepresentation rep(value);
-    if (rep.bits == minus_zero.bits) return false;
-    if (value >= kMinInt && value <= kMaxUInt32) {
-      if (value <= kMaxInt && value == static_cast<int32_t>(value)) {
-        return true;
-      }
-      if (value == static_cast<uint32_t>(value)) return true;
-    }
-    return false;
-  }
-
-  static inline NumberInfo TypeFromValue(Handle<Object> value);
-
-  inline bool IsUnknown() {
-    return type_ == kUnknownType;
-  }
-
-  inline bool IsNumber() {
-    ASSERT(type_ != kUninitializedType);
-    return ((type_ & kNumberType) == kNumberType);
-  }
-
-  inline bool IsSmi() {
-    ASSERT(type_ != kUninitializedType);
-    return ((type_ & kSmiType) == kSmiType);
-  }
-
-  inline bool IsInteger32() {
-    ASSERT(type_ != kUninitializedType);
-    return ((type_ & kInteger32Type) == kInteger32Type);
-  }
-
-  inline bool IsDouble() {
-    ASSERT(type_ != kUninitializedType);
-    return ((type_ & kDoubleType) == kDoubleType);
-  }
-
-  inline bool IsUninitialized() {
-    return type_ == kUninitializedType;
-  }
-
-  const char* ToString() {
-    switch (type_) {
-      case kUnknownType: return "UnknownType";
-      case kPrimitiveType: return "PrimitiveType";
-      case kNumberType: return "NumberType";
-      case kInteger32Type: return "Integer32Type";
-      case kSmiType: return "SmiType";
-      case kDoubleType: return "DoubleType";
-      case kStringType: return "StringType";
-      case kUninitializedType:
-        UNREACHABLE();
-        return "UninitializedType";
-    }
-    UNREACHABLE();
-    return "Unreachable code";
-  }
-
- private:
-  // We use 6 bits to represent the types.
-  enum Type {
-    kUnknownType = 0,          // 000000
-    kPrimitiveType = 0x10,     // 010000
-    kNumberType = 0x11,        // 010001
-    kInteger32Type = 0x13,     // 010011
-    kSmiType = 0x17,           // 010111
-    kDoubleType = 0x19,        // 011001
-    kStringType = 0x30,        // 110000
-    kUninitializedType = 0x3f  // 111111
-  };
-  explicit inline NumberInfo(Type t) : type_(t) { }
-
-  Type type_;
-};
-
-
-NumberInfo NumberInfo::Unknown() {
-  return NumberInfo(kUnknownType);
-}
-
-
-NumberInfo NumberInfo::Primitive() {
-  return NumberInfo(kPrimitiveType);
-}
-
-
-NumberInfo NumberInfo::Number() {
-  return NumberInfo(kNumberType);
-}
-
-
-NumberInfo NumberInfo::Integer32() {
-  return NumberInfo(kInteger32Type);
-}
-
-
-NumberInfo NumberInfo::Smi() {
-  return NumberInfo(kSmiType);
-}
-
-
-NumberInfo NumberInfo::Double() {
-  return NumberInfo(kDoubleType);
-}
-
-
-NumberInfo NumberInfo::String() {
-  return NumberInfo(kStringType);
-}
-
-
-NumberInfo NumberInfo::Uninitialized() {
-  return NumberInfo(kUninitializedType);
-}
-
-} }  // namespace v8::internal
-
-#endif  // V8_NUMBER_INFO_H_