1 // Copyright 2010 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #ifndef V8_NUMBER_INFO_H_ 29 #define V8_NUMBER_INFO_H_ 30 31 namespace v8 { 32 namespace internal { 33 34 class NumberInfo : public AllStatic { 35 public: 36 enum Type { 37 kUnknown = 0, 38 kNumber = 1, 39 kSmi = 3, 40 kHeapNumber = 5, 41 kUninitialized = 7 42 }; 43 44 // Return the weakest (least precise) common type. 45 static Type Combine(Type a, Type b) { 46 // Make use of the order of enum values. 47 return static_cast<Type>(a & b); 48 } 49 50 static bool IsNumber(Type a) { 51 ASSERT(a != kUninitialized); 52 return ((a & kNumber) != 0); 53 } 54 55 static const char* ToString(Type a) { 56 switch (a) { 57 case kUnknown: return "UnknownType"; 58 case kNumber: return "NumberType"; 59 case kSmi: return "SmiType"; 60 case kHeapNumber: return "HeapNumberType"; 61 case kUninitialized: 62 UNREACHABLE(); 63 return "UninitializedType"; 64 } 65 UNREACHABLE(); 66 return "Unreachable code"; 67 } 68 }; 69 70 } } // namespace v8::internal 71 72 #endif // V8_NUMBER_INFO_H_ 73
