| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "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 THE |
| * COPYRIGHT OWNER 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 |
| |
| #include <stdint.h> |
| |
| struct StaticTlsLayout { |
| constexpr StaticTlsLayout() {} |
| |
| private: |
| size_t offset_ = 0; |
| size_t alignment_ = 1; |
| bool overflowed_ = false; |
| |
| // Offsets to various Bionic TLS structs from the beginning of static TLS. |
| size_t offset_bionic_tcb_ = SIZE_MAX; |
| size_t offset_bionic_tls_ = SIZE_MAX; |
| |
| public: |
| size_t offset_bionic_tcb() const { return offset_bionic_tcb_; } |
| size_t offset_bionic_tls() const { return offset_bionic_tls_; } |
| |
| size_t size() const { return offset_; } |
| size_t alignment() const { return alignment_; } |
| bool overflowed() const { return overflowed_; } |
| |
| void reserve_tcb(); |
| void reserve_bionic_tls(); |
| void finish_layout(); |
| |
| private: |
| size_t reserve(size_t size, size_t alignment); |
| |
| template <typename T> size_t reserve_type() { |
| return reserve(sizeof(T), alignof(T)); |
| } |
| |
| size_t round_up_with_overflow_check(size_t value, size_t alignment); |
| }; |