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_SYSTEM_HOST_H 15 #define LLVM_SYSTEM_HOST_H 16 17 #include "llvm/ADT/StringMap.h" 18 #include <string> 19 20 namespace llvm { 21 namespace sys { 22 isLittleEndianHost()23 inline bool isLittleEndianHost() { 24 union { 25 int i; 26 char c; 27 }; 28 i = 1; 29 return c; 30 } 31 isBigEndianHost()32 inline bool isBigEndianHost() { 33 return !isLittleEndianHost(); 34 } 35 36 /// getDefaultTargetTriple() - Return the default target triple the compiler 37 /// has been configured to produce code for. 38 /// 39 /// The target triple is a string in the format of: 40 /// CPU_TYPE-VENDOR-OPERATING_SYSTEM 41 /// or 42 /// CPU_TYPE-VENDOR-KERNEL-OPERATING_SYSTEM 43 std::string getDefaultTargetTriple(); 44 45 /// getHostCPUName - Get the LLVM name for the host CPU. The particular format 46 /// of the name is target dependent, and suitable for passing as -mcpu to the 47 /// target which matches the host. 48 /// 49 /// \return - The host CPU name, or empty if the CPU could not be determined. 50 std::string getHostCPUName(); 51 52 /// getHostCPUFeatures - Get the LLVM names for the host CPU features. 53 /// The particular format of the names are target dependent, and suitable for 54 /// passing as -mattr to the target which matches the host. 55 /// 56 /// \param Features - A string mapping feature names to either 57 /// true (if enabled) or false (if disabled). This routine makes no guarantees 58 /// about exactly which features may appear in this map, except that they are 59 /// all valid LLVM feature names. 60 /// 61 /// \return - True on success. 62 bool getHostCPUFeatures(StringMap<bool> &Features); 63 } 64 } 65 66 #endif 67