projects / apple / javascriptcore.git / blame
| Commit | Line | Data |
|---|---|---|
| f9bf01c6 | 1 | /* |
| 81345200 | 2 | * Copyright (C) 2013 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 | ||
| 81345200 A |
26 | #ifndef StackAlignment_h |
| 27 | #define StackAlignment_h | |
| f9bf01c6 | 28 | |
| 93a37866 | 29 | #include "JSCJSValue.h" |
| 81345200 A |
30 | #include "JSStack.h" |
| 31 | #include <wtf/MathExtras.h> | |
| f9bf01c6 A |
32 | |
| 33 | namespace JSC { | |
| 34 | ||
| 81345200 A |
35 | // NB. Different platforms may have different requirements here. But 16 bytes is very common. |
| 36 | inline unsigned stackAlignmentBytes() { return 16; } | |
| 37 | ||
| 38 | inline unsigned stackAlignmentRegisters() | |
| 39 | { | |
| 40 | return stackAlignmentBytes() / sizeof(EncodedJSValue); | |
| 41 | } | |
| 42 | ||
| 43 | // Align argument count taking into account the CallFrameHeaderSize may be | |
| 44 | // an "unaligned" count of registers. | |
| 45 | inline unsigned roundArgumentCountToAlignFrame(unsigned argumentCount) | |
| f9bf01c6 | 46 | { |
| 81345200 | 47 | return WTF::roundUpToMultipleOf(stackAlignmentRegisters(), argumentCount + JSStack::CallFrameHeaderSize) - JSStack::CallFrameHeaderSize; |
| 93a37866 A |
48 | } |
| 49 | ||
| 81345200 A |
50 | // Align local register count to make the last local end on a stack aligned address given the |
| 51 | // CallFrame is at an address that is stack aligned minus JSStack::CallerFrameAndPCSize | |
| 52 | inline unsigned roundLocalRegisterCountForFramePointerOffset(unsigned localRegisterCount) | |
| 93a37866 | 53 | { |
| 81345200 A |
54 | return WTF::roundUpToMultipleOf(stackAlignmentRegisters(), localRegisterCount + JSStack::CallerFrameAndPCSize) - JSStack::CallerFrameAndPCSize; |
| 55 | } | |
| 56 | ||
| 57 | inline unsigned logStackAlignmentRegisters() | |
| 58 | { | |
| 59 | return WTF::fastLog2(stackAlignmentRegisters()); | |
| f9bf01c6 A |
60 | } |
| 61 | ||
| 6fe7ccc8 | 62 | } // namespace JSC |
| f9bf01c6 | 63 | |
| 81345200 A |
64 | #endif // StackAlignment_h |
| 65 |