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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef BAZEL_SRC_MAIN_CPP_UTIL_PORT_H_
#define BAZEL_SRC_MAIN_CPP_UTIL_PORT_H_
#include <stddef.h> // For size_t on Linux, Darwin
#include <cinttypes> // For size_t on Windows
// GCC-specific features
#if (defined(COMPILER_GCC3) || defined(__APPLE__)) && !defined(SWIG)
//
// Tell the compiler to do printf format string checking if the
// compiler supports it; see the 'format' attribute in
// <http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Function-Attributes.html>.
//
// N.B.: As the GCC manual states, "[s]ince non-static C++ methods
// have an implicit 'this' argument, the arguments of such methods
// should be counted from two, not one."
//
#define PRINTF_ATTRIBUTE(string_index, first_to_check) \
__attribute__((__format__ \
(__printf__, string_index, first_to_check)))
#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
#else // Not GCC
#define PRINTF_ATTRIBUTE(string_index, first_to_check)
#define ATTRIBUTE_UNUSED
#endif // GCC
// HAVE_ATTRIBUTE
//
// A function-like feature checking macro that is a wrapper around
// `__has_attribute`, which is defined by GCC 5+ and Clang and evaluates to a
// nonzero constant integer if the attribute is supported or 0 if not.
//
// It evaluates to zero if `__has_attribute` is not defined by the compiler.
//
// GCC: https://gcc.gnu.org/gcc-5/changes.html
// Clang: https://clang.llvm.org/docs/LanguageExtensions.html
#ifdef __has_attribute
#define HAVE_ATTRIBUTE(x) __has_attribute(x)
#else
#define HAVE_ATTRIBUTE(x) (0)
#endif
// ATTRIBUTE_NORETURN
//
// Tells the compiler that a given function never returns.
#if defined(SWIG)
#define ATTRIBUTE_NORETURN
#elif HAVE_ATTRIBUTE(noreturn) || (defined(__GNUC__) && !defined(__clang__))
#define ATTRIBUTE_NORETURN __attribute__((noreturn))
#else
#define ATTRIBUTE_NORETURN
#endif
// Linux I/O priorities support is available only in later versions of glibc.
// Therefore, we include some of the needed definitions here. May need to
// be removed once we switch to a new version of glibc
// (As of 10/24/08 it is unclear when glibc support will become available.)
enum IOPriorityClass {
// No I/O priority value has yet been set. The kernel may assign I/O
// priority based on the process nice value.
IOPRIO_CLASS_NONE,
// Real-time, highest priority. Given first access to the disk at
// every opportunity. Use with care: one such process can STARVE
// THE ENTIRE SYSTEM. Has 8 priority levels (0-7).
IOPRIO_CLASS_RT,
// Best-effort, default for any process. Has 8 priority levels (0-7).
IOPRIO_CLASS_BE,
// Idle, lowest priority. Processes running at this level only get
// I/O time when no one else needs the disk, and MAY BECOME
// STARVED if higher priority processes are constantly accessing
// the disk. With the "anticipatory" I/O scheduler, mapped to
// IOPRIO_CLASS_BE, level 3.
IOPRIO_CLASS_IDLE,
};
enum {
IOPRIO_WHO_PROCESS = 1,
IOPRIO_WHO_PGRP,
IOPRIO_WHO_USER,
};
#ifndef IOPRIO_CLASS_SHIFT
#define IOPRIO_CLASS_SHIFT 13
#endif
#ifndef IOPRIO_PRIO_VALUE
#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
#endif
namespace blaze_util {
int sys_ioprio_set(int which, int who, int ioprio);
} // namespace blaze_util
// The arraysize(arr) macro returns the # of elements in an array arr.
// The expression is a compile-time constant, and therefore can be
// used in defining new arrays, for example. If you use arraysize on
// a pointer by mistake, you will get a compile-time error.
// This template function declaration is used in defining arraysize.
// Note that the function doesn't need an implementation, as we only
// use its type.
template <typename T, size_t N>
char (&ArraySizeHelper(T (&array)[N]))[N];
// That gcc wants both of these prototypes seems mysterious. VC, for
// its part, can't decide which to use (another mystery). Matching of
// template overloads: the final frontier.
template <typename T, size_t N>
char (&ArraySizeHelper(const T (&array)[N]))[N];
#define arraysize(array) (sizeof(ArraySizeHelper(array)))
#ifdef COMPILER_MSVC
// TODO(laszlocsomor) 2016-11-28: move pid_t usage out of global_variables.h and
// whereever else it appears. Find some way to not have to declare a pid_t here,
// either by making PID handling platform-independent or some other idea; remove
// the following typedef afterwards.
typedef int pid_t;
#endif // COMPILER_MSVC
#endif // BAZEL_SRC_MAIN_CPP_UTIL_PORT_H_
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