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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
//===-- xray_utils.h --------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of XRay, a dynamic runtime instrumentation system.
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//
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// Some shared utilities for the XRay runtime implementation.
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//
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//===----------------------------------------------------------------------===//
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#ifndef XRAY_UTILS_H
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#define XRAY_UTILS_H
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#include <cstddef>
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#include <cstdint>
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#include <sys/types.h>
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#include <utility>
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#include "sanitizer_common/sanitizer_common.h"
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#if SANITIZER_FUCHSIA
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#include <zircon/types.h>
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#endif
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namespace __xray {
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class LogWriter {
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public:
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#if SANITIZER_FUCHSIA
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LogWriter(zx_handle_t Vmo) : Vmo(Vmo) {}
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#else
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explicit LogWriter(int Fd) : Fd(Fd) {}
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#endif
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~LogWriter();
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// Write a character range into a log.
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void WriteAll(const char *Begin, const char *End);
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void Flush();
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// Returns a new log instance initialized using the flag-provided values.
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static LogWriter *Open();
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// Closes and deallocates the log instance.
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static void Close(LogWriter *LogWriter);
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private:
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#if SANITIZER_FUCHSIA
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zx_handle_t Vmo = ZX_HANDLE_INVALID;
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uint64_t Offset = 0;
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#else
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int Fd = -1;
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#endif
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};
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constexpr size_t gcd(size_t a, size_t b) {
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return (b == 0) ? a : gcd(b, a % b);
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}
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constexpr size_t lcm(size_t a, size_t b) { return a * b / gcd(a, b); }
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constexpr size_t nearest_boundary(size_t number, size_t multiple) {
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return multiple * ((number / multiple) + (number % multiple ? 1 : 0));
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}
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constexpr size_t next_pow2_helper(size_t num, size_t acc) {
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return (1u << acc) >= num ? (1u << acc) : next_pow2_helper(num, acc + 1);
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}
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constexpr size_t next_pow2(size_t number) {
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return next_pow2_helper(number, 1);
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}
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template <class T> constexpr T &max(T &A, T &B) { return A > B ? A : B; }
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template <class T> constexpr T &min(T &A, T &B) { return A <= B ? A : B; }
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constexpr ptrdiff_t diff(uintptr_t A, uintptr_t B) {
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return max(A, B) - min(A, B);
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}
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} // namespace __xray
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#endif // XRAY_UTILS_H
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