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
29namespace llvm {
30namespace 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