1 //===- llvm/Support/Host.h - Host machine characteristics --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Methods for querying the nature of the host machine.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_SUPPORT_HOST_H
15 #define LLVM_SUPPORT_HOST_H
17 #include "llvm/ADT/StringMap.h"
19 #if defined(__linux__) || defined(__GNU__)
22 #if !defined(BYTE_ORDER) && !defined(LLVM_ON_WIN32)
23 #include <machine/endian.h>
32 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
33 static const bool IsBigEndianHost = true;
35 static const bool IsBigEndianHost = false;
38 static const bool IsLittleEndianHost = !IsBigEndianHost;
40 /// getDefaultTargetTriple() - Return the default target triple the compiler
41 /// has been configured to produce code for.
43 /// The target triple is a string in the format of:
44 /// CPU_TYPE-VENDOR-OPERATING_SYSTEM
46 /// CPU_TYPE-VENDOR-KERNEL-OPERATING_SYSTEM
47 std::string getDefaultTargetTriple();
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();
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.
57 /// \return - The host CPU name, or empty if the CPU could not be determined.
58 StringRef getHostCPUName();
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.
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.
69 /// \return - True on success.
70 bool getHostCPUFeatures(StringMap<bool> &Features);