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 19 #if defined(__linux__) || defined(__GNU__) 20 #include <endian.h> 21 #else 22 #if !defined(BYTE_ORDER) && !defined(LLVM_ON_WIN32) 23 #include <machine/endian.h> 24 #endif 25 #endif 26 27 #include <string> 28 29 namespace llvm { 30 namespace sys { 31 32 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN 33 static const bool IsBigEndianHost = true; 34 #else 35 static const bool IsBigEndianHost = false; 36 #endif 37 38 static const bool IsLittleEndianHost = !IsBigEndianHost; 39 40 /// getDefaultTargetTriple() - Return the default target triple the compiler 41 /// has been configured to produce code for. 42 /// 43 /// The target triple is a string in the format of: 44 /// CPU_TYPE-VENDOR-OPERATING_SYSTEM 45 /// or 46 /// CPU_TYPE-VENDOR-KERNEL-OPERATING_SYSTEM 47 std::string getDefaultTargetTriple(); 48 49 /// getProcessTriple() - Return an appropriate target triple for generating 50 /// code to be loaded into the current process, e.g. when using the JIT. 51 std::string getProcessTriple(); 52 53 /// getHostCPUName - Get the LLVM name for the host CPU. The particular format 54 /// of the name is target dependent, and suitable for passing as -mcpu to the 55 /// target which matches the host. 56 /// 57 /// \return - The host CPU name, or empty if the CPU could not be determined. 58 StringRef getHostCPUName(); 59 60 /// getHostCPUFeatures - Get the LLVM names for the host CPU features. 61 /// The particular format of the names are target dependent, and suitable for 62 /// passing as -mattr to the target which matches the host. 63 /// 64 /// \param Features - A string mapping feature names to either 65 /// true (if enabled) or false (if disabled). This routine makes no guarantees 66 /// about exactly which features may appear in this map, except that they are 67 /// all valid LLVM feature names. 68 /// 69 /// \return - True on success. 70 bool getHostCPUFeatures(StringMap<bool> &Features); 71 } 72 } 73 74 #endif 75