Home | History | Annotate | Download | only in Support
      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 
     23   inline bool isLittleEndianHost() {
     24     union {
     25       int i;
     26       char c;
     27     };
     28     i = 1;
     29     return c;
     30   }
     31 
     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