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