Host.h revision 218885 
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
20namespace llvm {
21namespace 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  /// getHostTriple() - Return the target triple of the running
37  /// system.
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 getHostTriple();
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