ARMSubtarget.h revision a8e2989ece6dc46df59b0768184028257f913843 
1//=====---- ARMSubtarget.h - Define Subtarget for the ARM -----*- C++ -*--====//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file was developed by Evan Cheng and is distributed under the
6// University of Illinois Open Source License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file declares the ARM specific subclass of TargetSubtarget.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef ARMSUBTARGET_H
15#define ARMSUBTARGET_H
16
17#include "llvm/Target/TargetSubtarget.h"
18#include <string>
19
20namespace llvm {
21class Module;
22
23class ARMSubtarget : public TargetSubtarget {
24protected:
25  enum ARMArchEnum {
26    V4T, V5T, V5TE, V6
27  };
28
29  /// ARMArchVersion - ARM architecture vecrsion: V4T (base), V5T, V5TE,
30  /// and V6.
31  ARMArchEnum ARMArchVersion;
32
33  /// HasVFP2 - True if the processor supports Vector Floating Point (VFP) V2
34  /// instructions.
35  bool HasVFP2;
36
37  /// IsThumb - True if we are in thumb mode, false if in ARM mode.
38  bool IsThumb;
39
40  bool IsDarwin;
41
42  /// UseThumbBacktraces - True if we use thumb style backtraces.
43  bool UseThumbBacktraces;
44
45  /// IsR9Reserved - True if R9 is a not available as general purpose register.
46  bool IsR9Reserved;
47
48  /// stackAlignment - The minimum alignment known to hold of the stack frame on
49  /// entry to the function and which must be maintained by every function.
50  unsigned stackAlignment;
51
52 public:
53  /// This constructor initializes the data members to match that
54  /// of the specified module.
55  ///
56  ARMSubtarget(const Module &M, const std::string &FS);
57
58  /// ParseSubtargetFeatures - Parses features string setting specified
59  /// subtarget options.  Definition of function is auto generated by tblgen.
60  void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
61
62  bool hasV4TOps()  const { return ARMArchVersion >= V4T; }
63  bool hasV5TOps()  const { return ARMArchVersion >= V5T; }
64  bool hasV5TEOps() const { return ARMArchVersion >= V5TE; }
65  bool hasV6Ops()   const { return ARMArchVersion >= V6; }
66
67  bool hasVFP2() const { return HasVFP2; }
68
69  bool isDarwin() const { return IsDarwin; }
70  bool isThumb() const { return IsThumb; }
71
72  bool useThumbBacktraces() const { return UseThumbBacktraces; }
73  bool isR9Reserved() const { return IsR9Reserved; }
74
75  /// getStackAlignment - Returns the minimum alignment known to hold of the
76  /// stack frame on entry to the function and which must be maintained by every
77  /// function for this subtarget.
78  unsigned getStackAlignment() const { return stackAlignment; }
79};
80} // End llvm namespace
81
82#endif  // ARMSUBTARGET_H
83