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	1	/*
	2	* Copyright (C) 2012 Apple Inc. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	14	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	15	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	16	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	17	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	18	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	19	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	20	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	21	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	23	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#ifndef DFGDoubleFormatState_h
	27	#define DFGDoubleFormatState_h
	28
	29	namespace JSC { namespace DFG {
	30
	31	enum DoubleFormatState {
	32	EmptyDoubleFormatState, // bottom
	33	UsingDoubleFormat,
	34	NotUsingDoubleFormat,
	35	CantUseDoubleFormat // top
	36	};
	37
	38	inline DoubleFormatState mergeDoubleFormatStates(DoubleFormatState a, DoubleFormatState b)
	39	{
	40	switch (a) {
	41	case EmptyDoubleFormatState:
	42	return b;
	43	case UsingDoubleFormat:
	44	switch (b) {
	45	case EmptyDoubleFormatState:
	46	case UsingDoubleFormat:
	47	return UsingDoubleFormat;
	48	case NotUsingDoubleFormat:
	49	case CantUseDoubleFormat:
	50	return CantUseDoubleFormat;
	51	}
	52	case NotUsingDoubleFormat:
	53	switch (b) {
	54	case EmptyDoubleFormatState:
	55	case NotUsingDoubleFormat:
	56	return NotUsingDoubleFormat;
	57	case UsingDoubleFormat:
	58	case CantUseDoubleFormat:
	59	return CantUseDoubleFormat;
	60	}
	61	case CantUseDoubleFormat:
	62	return CantUseDoubleFormat;
	63	}
	64	ASSERT_NOT_REACHED();
	65	return CantUseDoubleFormat;
	66	}
	67
	68	inline bool mergeDoubleFormatState(DoubleFormatState& dest, DoubleFormatState src)
	69	{
	70	DoubleFormatState newState = mergeDoubleFormatStates(dest, src);
	71	if (newState == dest)
	72	return false;
	73	dest = newState;
	74	return true;
	75	}
	76
	77	inline const char* doubleFormatStateToString(DoubleFormatState state)
	78	{
	79	switch (state) {
	80	case EmptyDoubleFormatState:
	81	return "Empty";
	82	case UsingDoubleFormat:
	83	return "DoubleFormat";
	84	case NotUsingDoubleFormat:
	85	return "ValueFormat";
	86	case CantUseDoubleFormat:
	87	return "ForceValue";
	88	}
	89	ASSERT_NOT_REACHED();
	90	return 0;
	91	}
	92
	93	} } // namespace JSC::DFG
	94
	95	#endif // DFGDoubleFormatState_h
	96