/* * 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)