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//===- llvm/Support/Host.h - Host machine characteristics --------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Methods for querying the nature of the host machine.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_HOST_H
#define LLVM_SUPPORT_HOST_H
#include "llvm/ADT/StringMap.h"
#if defined(__linux__) || defined(__GNU__) || defined(__HAIKU__)
#include <endian.h>
#elif defined(_AIX)
#include <sys/machine.h>
#elif defined(__sun)
/* Solaris provides _BIG_ENDIAN/_LITTLE_ENDIAN selector in sys/types.h */
#include <sys/types.h>
#define BIG_ENDIAN 4321
#define LITTLE_ENDIAN 1234
#if defined(_BIG_ENDIAN)
#define BYTE_ORDER BIG_ENDIAN
#else
#define BYTE_ORDER LITTLE_ENDIAN
#endif
#else
#if !defined(BYTE_ORDER) && !defined(_WIN32)
#include <machine/endian.h>
#endif
#endif
#include <string>
namespace llvm {
namespace sys {
#if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
constexpr bool IsBigEndianHost = true;
#else
constexpr bool IsBigEndianHost = false;
#endif
static const bool IsLittleEndianHost = !IsBigEndianHost;
/// getDefaultTargetTriple() - Return the default target triple the compiler
/// has been configured to produce code for.
///
/// The target triple is a string in the format of:
/// CPU_TYPE-VENDOR-OPERATING_SYSTEM
/// or
/// CPU_TYPE-VENDOR-KERNEL-OPERATING_SYSTEM
std::string getDefaultTargetTriple();
/// getProcessTriple() - Return an appropriate target triple for generating
/// code to be loaded into the current process, e.g. when using the JIT.
std::string getProcessTriple();
/// getHostCPUName - Get the LLVM name for the host CPU. The particular format
/// of the name is target dependent, and suitable for passing as -mcpu to the
/// target which matches the host.
///
/// \return - The host CPU name, or empty if the CPU could not be determined.
StringRef getHostCPUName();
/// getHostCPUFeatures - Get the LLVM names for the host CPU features.
/// The particular format of the names are target dependent, and suitable for
/// passing as -mattr to the target which matches the host.
///
/// \param Features - A string mapping feature names to either
/// true (if enabled) or false (if disabled). This routine makes no guarantees
/// about exactly which features may appear in this map, except that they are
/// all valid LLVM feature names.
///
/// \return - True on success.
bool getHostCPUFeatures(StringMap<bool> &Features);
/// Get the number of physical cores (as opposed to logical cores returned
/// from thread::hardware_concurrency(), which includes hyperthreads).
/// Returns -1 if unknown for the current host system.
int getHostNumPhysicalCores();
namespace detail {
/// Helper functions to extract HostCPUName from /proc/cpuinfo on linux.
StringRef getHostCPUNameForPowerPC(StringRef ProcCpuinfoContent);
StringRef getHostCPUNameForARM(StringRef ProcCpuinfoContent);
StringRef getHostCPUNameForS390x(StringRef ProcCpuinfoContent);
StringRef getHostCPUNameForBPF();
}
}
}
#endif
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