| /* |
| * Copyright (C) 2012 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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. |
| */ |
| |
| #pragma once |
| |
| namespace JSC { namespace DFG { |
| |
| enum DoubleFormatState { |
| EmptyDoubleFormatState, // bottom |
| UsingDoubleFormat, |
| NotUsingDoubleFormat, |
| CantUseDoubleFormat // top |
| }; |
| |
| inline DoubleFormatState mergeDoubleFormatStates(DoubleFormatState a, DoubleFormatState b) |
| { |
| switch (a) { |
| case EmptyDoubleFormatState: |
| return b; |
| case UsingDoubleFormat: |
| switch (b) { |
| case EmptyDoubleFormatState: |
| case UsingDoubleFormat: |
| return UsingDoubleFormat; |
| case NotUsingDoubleFormat: |
| case CantUseDoubleFormat: |
| return CantUseDoubleFormat; |
| } |
| RELEASE_ASSERT_NOT_REACHED(); |
| case NotUsingDoubleFormat: |
| switch (b) { |
| case EmptyDoubleFormatState: |
| case NotUsingDoubleFormat: |
| return NotUsingDoubleFormat; |
| case UsingDoubleFormat: |
| case CantUseDoubleFormat: |
| return CantUseDoubleFormat; |
| } |
| RELEASE_ASSERT_NOT_REACHED(); |
| case CantUseDoubleFormat: |
| return CantUseDoubleFormat; |
| } |
| RELEASE_ASSERT_NOT_REACHED(); |
| return CantUseDoubleFormat; |
| } |
| |
| inline bool mergeDoubleFormatState(DoubleFormatState& dest, DoubleFormatState src) |
| { |
| DoubleFormatState newState = mergeDoubleFormatStates(dest, src); |
| if (newState == dest) |
| return false; |
| dest = newState; |
| return true; |
| } |
| |
| inline const char* doubleFormatStateToString(DoubleFormatState state) |
| { |
| switch (state) { |
| case EmptyDoubleFormatState: |
| return "Empty"; |
| case UsingDoubleFormat: |
| return "DoubleFormat"; |
| case NotUsingDoubleFormat: |
| return "ValueFormat"; |
| case CantUseDoubleFormat: |
| return "ForceValue"; |
| } |
| RELEASE_ASSERT_NOT_REACHED(); |
| return nullptr; |
| } |
| |
| } } // namespace JSC::DFG |