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/*
* Copyright (C) 2017 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
#if ENABLE(B3_JIT)
#include <wtf/Vector.h>
namespace JSC { namespace B3 { namespace Air {
class Code;
class StackSlot;
// This is a collection of utilities shared by both stack allocators
// (allocateStackByGraphColoring and allocateRegistersAndStackByLinearScan).
// Attempt to put the given stack slot at the given offset. Returns false if this would cause
// the slot to overlap with any of the given slots.
bool attemptAssignment(StackSlot*, intptr_t offsetFromFP, const Vector<StackSlot*>& adjacent);
// Performs a first-fit assignment (smallest possible offset) of the given stack slot such that
// it does not overlap with any of the adjacent slots.
void assign(StackSlot*, const Vector<StackSlot*>& adjacent);
// Allocates all stack slots that escape - that is, that don't have live ranges that can be
// determined by looking at their uses. Returns a vector of slots that got assigned offsets.
// This assumes that no stack allocation has happened previously, and so frame size is zero.
Vector<StackSlot*> allocateAndGetEscapedStackSlotsWithoutChangingFrameSize(Code&);
// Same as allocateAndGetEscapedStackSlotsWithoutChangingFrameSize, but does not return the
// assigned slots, and does set the frame size based on the largest extent of any of the
// allocated slots.
void allocateEscapedStackSlots(Code&);
// Updates Code::frameSize based on the largest extent of any stack slot. This is useful to
// call after performing stack allocation.
void updateFrameSizeBasedOnStackSlots(Code&);
} } } // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)
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