1//===- llvm/Support/Host.h - Host machine characteristics --------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Methods for querying the nature of the host machine. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_SUPPORT_HOST_H 15#define LLVM_SUPPORT_HOST_H 16 17#include "llvm/ADT/StringMap.h" 18#include "llvm/Support/MemoryBuffer.h" 19 20#if defined(__linux__) || defined(__GNU__) || defined(__HAIKU__) 21#include <endian.h> 22#elif defined(_AIX) 23#include <sys/machine.h> 24#elif defined(__sun) 25/* Solaris provides _BIG_ENDIAN/_LITTLE_ENDIAN selector in sys/types.h */ 26#include <sys/types.h> 27#define BIG_ENDIAN 4321 28#define LITTLE_ENDIAN 1234 29#if defined(_BIG_ENDIAN) 30#define BYTE_ORDER BIG_ENDIAN 31#else 32#define BYTE_ORDER LITTLE_ENDIAN 33#endif 34#else 35#if !defined(BYTE_ORDER) && !defined(LLVM_ON_WIN32) 36#include <machine/endian.h> 37#endif 38#endif 39 40#include <string> 41 42namespace llvm { 43namespace sys { 44 45#if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN 46constexpr bool IsBigEndianHost = true; 47#else 48constexpr bool IsBigEndianHost = false; 49#endif 50 51 static const bool IsLittleEndianHost = !IsBigEndianHost; 52 53 /// getDefaultTargetTriple() - Return the default target triple the compiler 54 /// has been configured to produce code for. 55 /// 56 /// The target triple is a string in the format of: 57 /// CPU_TYPE-VENDOR-OPERATING_SYSTEM 58 /// or 59 /// CPU_TYPE-VENDOR-KERNEL-OPERATING_SYSTEM 60 std::string getDefaultTargetTriple(); 61 62 /// getProcessTriple() - Return an appropriate target triple for generating 63 /// code to be loaded into the current process, e.g. when using the JIT. 64 std::string getProcessTriple(); 65 66 /// getHostCPUName - Get the LLVM name for the host CPU. The particular format 67 /// of the name is target dependent, and suitable for passing as -mcpu to the 68 /// target which matches the host. 69 /// 70 /// \return - The host CPU name, or empty if the CPU could not be determined. 71 StringRef getHostCPUName(); 72 73 /// getHostCPUFeatures - Get the LLVM names for the host CPU features. 74 /// The particular format of the names are target dependent, and suitable for 75 /// passing as -mattr to the target which matches the host. 76 /// 77 /// \param Features - A string mapping feature names to either 78 /// true (if enabled) or false (if disabled). This routine makes no guarantees 79 /// about exactly which features may appear in this map, except that they are 80 /// all valid LLVM feature names. 81 /// 82 /// \return - True on success. 83 bool getHostCPUFeatures(StringMap<bool> &Features); 84 85 /// Get the number of physical cores (as opposed to logical cores returned 86 /// from thread::hardware_concurrency(), which includes hyperthreads). 87 /// Returns -1 if unknown for the current host system. 88 int getHostNumPhysicalCores(); 89 90 namespace detail { 91 /// Helper functions to extract HostCPUName from /proc/cpuinfo on linux. 92 StringRef getHostCPUNameForPowerPC(const StringRef &ProcCpuinfoContent); 93 StringRef getHostCPUNameForARM(const StringRef &ProcCpuinfoContent); 94 StringRef getHostCPUNameForS390x(const StringRef &ProcCpuinfoContent); 95 StringRef getHostCPUNameForBPF(); 96 } 97} 98} 99 100#endif 101