[apple/javascriptcore.git] / dfg / DFGBranchDirection.h

/*
 * 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. 
 */

#ifndef DFGBranchDirection_h
#define DFGBranchDirection_h

#include <wtf/Platform.h>

#if ENABLE(DFG_JIT)

namespace JSC { namespace DFG {

enum BranchDirection {
    // This is not a branch and so there is no branch direction, or
    // the branch direction has yet to be set.
    InvalidBranchDirection,
        
    // The branch takes the true case.
    TakeTrue,
        
    // The branch takes the false case.
    TakeFalse,
        
    // For all we know, the branch could go either direction, so we
    // have to assume the worst.
    TakeBoth
};
    
static inline const char* branchDirectionToString(BranchDirection branchDirection)
{
    switch (branchDirection) {
    case InvalidBranchDirection:
        return "Invalid";
    case TakeTrue:
        return "TakeTrue";
    case TakeFalse:
        return "TakeFalse";
    case TakeBoth:
        return "TakeBoth";
    }
}
    
static inline bool isKnownDirection(BranchDirection branchDirection)
{
    switch (branchDirection) {
    case TakeTrue:
    case TakeFalse:
        return true;
    default:
        return false;
    }
}

static inline bool branchCondition(BranchDirection branchDirection)
{
    if (branchDirection == TakeTrue)
        return true;
    ASSERT(branchDirection == TakeFalse);
    return false;
}

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)

#endif // DFGBranchDirection_h
Commit	Line	Data
f9bf01c6	1	/*
93a37866	2	* Copyright (C) 2012 Apple Inc. All rights reserved.
f9bf01c6 A	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
93a37866 A	26	#ifndef DFGBranchDirection_h
93a37866 A	27	#define DFGBranchDirection_h
f9bf01c6	28
6fe7ccc8	29	#include <wtf/Platform.h>
f9bf01c6	30
6fe7ccc8	31	#if ENABLE(DFG_JIT)
f9bf01c6	32
6fe7ccc8	33	namespace JSC { namespace DFG {
f9bf01c6	34
93a37866 A	35	enum BranchDirection {
	36	// This is not a branch and so there is no branch direction, or
	37	// the branch direction has yet to be set.
	38	InvalidBranchDirection,
	39
	40	// The branch takes the true case.
	41	TakeTrue,
	42
	43	// The branch takes the false case.
	44	TakeFalse,
	45
	46	// For all we know, the branch could go either direction, so we
	47	// have to assume the worst.
	48	TakeBoth
	49	};
	50
	51	static inline const char* branchDirectionToString(BranchDirection branchDirection)
	52	{
	53	switch (branchDirection) {
	54	case InvalidBranchDirection:
	55	return "Invalid";
	56	case TakeTrue:
	57	return "TakeTrue";
	58	case TakeFalse:
	59	return "TakeFalse";
	60	case TakeBoth:
	61	return "TakeBoth";
	62	}
	63	}
	64
	65	static inline bool isKnownDirection(BranchDirection branchDirection)
	66	{
	67	switch (branchDirection) {
	68	case TakeTrue:
	69	case TakeFalse:
	70	return true;
	71	default:
	72	return false;
	73	}
	74	}
14957cd0	75
93a37866 A	76	static inline bool branchCondition(BranchDirection branchDirection)
	77	{
	78	if (branchDirection == TakeTrue)
	79	return true;
	80	ASSERT(branchDirection == TakeFalse);
	81	return false;
	82	}
f9bf01c6	83
6fe7ccc8	84	} } // namespace JSC::DFG
f9bf01c6	85
6fe7ccc8 A	86	#endif // ENABLE(DFG_JIT)
6fe7ccc8 A	87
93a37866	88	#endif // DFGBranchDirection_h