Host.h revision 249423 
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#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  /// 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  /// getProcessTriple() - Return an appropriate target triple for generating
46  /// code to be loaded into the current process, e.g. when using the JIT.
47  std::string getProcessTriple();
48
49  /// getHostCPUName - Get the LLVM name for the host CPU. The particular format
50  /// of the name is target dependent, and suitable for passing as -mcpu to the
51  /// target which matches the host.
52  ///
53  /// \return - The host CPU name, or empty if the CPU could not be determined.
54  std::string getHostCPUName();
55
56  /// getHostCPUFeatures - Get the LLVM names for the host CPU features.
57  /// The particular format of the names are target dependent, and suitable for
58  /// passing as -mattr to the target which matches the host.
59  ///
60  /// \param Features - A string mapping feature names to either
61  /// true (if enabled) or false (if disabled). This routine makes no guarantees
62  /// about exactly which features may appear in this map, except that they are
63  /// all valid LLVM feature names.
64  ///
65  /// \return - True on success.
66  bool getHostCPUFeatures(StringMap<bool> &Features);
67}
68}
69
70#endif
71