1/*
2 * Copyright (C) 2017 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#pragma once
27
28#if ENABLE(B3_JIT)
29
30#include <wtf/Vector.h>
31
32namespace JSC { namespace B3 { namespace Air {
33
34class Code;
35class StackSlot;
36
37// This is a collection of utilities shared by both stack allocators
38// (allocateStackByGraphColoring and allocateRegistersAndStackByLinearScan).
39
40// Attempt to put the given stack slot at the given offset. Returns false if this would cause
41// the slot to overlap with any of the given slots.
42bool attemptAssignment(StackSlot*, intptr_t offsetFromFP, const Vector<StackSlot*>& adjacent);
43
44// Performs a first-fit assignment (smallest possible offset) of the given stack slot such that
45// it does not overlap with any of the adjacent slots.
46void assign(StackSlot*, const Vector<StackSlot*>& adjacent);
47
48// Allocates all stack slots that escape - that is, that don't have live ranges that can be
49// determined by looking at their uses. Returns a vector of slots that got assigned offsets.
50// This assumes that no stack allocation has happened previously, and so frame size is zero.
51Vector<StackSlot*> allocateAndGetEscapedStackSlotsWithoutChangingFrameSize(Code&);
52
53// Same as allocateAndGetEscapedStackSlotsWithoutChangingFrameSize, but does not return the
54// assigned slots, and does set the frame size based on the largest extent of any of the
55// allocated slots.
56void allocateEscapedStackSlots(Code&);
57
58// Updates Code::frameSize based on the largest extent of any stack slot. This is useful to
59// call after performing stack allocation.
60void updateFrameSizeBasedOnStackSlots(Code&);
61
62} } } // namespace JSC::B3::Air
63
64#endif // ENABLE(B3_JIT)
65
66