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      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   std::string 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