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00001 //===- llvm/Support/Host.h - Host machine characteristics --------*- C++ -*-===//
00002 //
00003 //                     The LLVM Compiler Infrastructure
00004 //
00005 // This file is distributed under the University of Illinois Open Source
00006 // License. See LICENSE.TXT for details.
00007 //
00008 //===----------------------------------------------------------------------===//
00009 //
00010 // Methods for querying the nature of the host machine.
00011 //
00012 //===----------------------------------------------------------------------===//
00013 
00014 #ifndef LLVM_SUPPORT_HOST_H
00015 #define LLVM_SUPPORT_HOST_H
00016 
00017 #include "llvm/ADT/StringMap.h"
00018 
00019 #if defined(__linux__) || defined(__GNU__)
00020 #include <endian.h>
00021 #else
00022 #if !defined(BYTE_ORDER) && !defined(LLVM_ON_WIN32)
00023 #include <machine/endian.h>
00024 #endif
00025 #endif
00026 
00027 #include <string>
00028 
00029 namespace llvm {
00030 namespace sys {
00031 
00032 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
00033   static const bool IsBigEndianHost = true;
00034 #else
00035   static const bool IsBigEndianHost = false;
00036 #endif
00037 
00038   static const bool IsLittleEndianHost = !IsBigEndianHost;
00039 
00040   /// getDefaultTargetTriple() - Return the default target triple the compiler
00041   /// has been configured to produce code for.
00042   ///
00043   /// The target triple is a string in the format of:
00044   ///   CPU_TYPE-VENDOR-OPERATING_SYSTEM
00045   /// or
00046   ///   CPU_TYPE-VENDOR-KERNEL-OPERATING_SYSTEM
00047   std::string getDefaultTargetTriple();
00048 
00049   /// getProcessTriple() - Return an appropriate target triple for generating
00050   /// code to be loaded into the current process, e.g. when using the JIT.
00051   std::string getProcessTriple();
00052 
00053   /// getHostCPUName - Get the LLVM name for the host CPU. The particular format
00054   /// of the name is target dependent, and suitable for passing as -mcpu to the
00055   /// target which matches the host.
00056   ///
00057   /// \return - The host CPU name, or empty if the CPU could not be determined.
00058   std::string getHostCPUName();
00059 
00060   /// getHostCPUFeatures - Get the LLVM names for the host CPU features.
00061   /// The particular format of the names are target dependent, and suitable for
00062   /// passing as -mattr to the target which matches the host.
00063   ///
00064   /// \param Features - A string mapping feature names to either
00065   /// true (if enabled) or false (if disabled). This routine makes no guarantees
00066   /// about exactly which features may appear in this map, except that they are
00067   /// all valid LLVM feature names.
00068   ///
00069   /// \return - True on success.
00070   bool getHostCPUFeatures(StringMap<bool> &Features);
00071 }
00072 }
00073 
00074 #endif