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 42 namespace llvm { 43 namespace sys { 44 45 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN 46 constexpr bool IsBigEndianHost = true; 47 #else 48 constexpr 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
