1//===-- llvm/Target/TargetCallingConv.h - Calling Convention ----*- 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// This file defines types for working with calling-convention information.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_TARGET_TARGETCALLINGCONV_H
15#define LLVM_TARGET_TARGETCALLINGCONV_H
16
17namespace llvm {
18
19namespace ISD {
20  struct ArgFlagsTy {
21  private:
22    static const uint64_t NoFlagSet      = 0ULL;
23    static const uint64_t ZExt           = 1ULL<<0;  ///< Zero extended
24    static const uint64_t ZExtOffs       = 0;
25    static const uint64_t SExt           = 1ULL<<1;  ///< Sign extended
26    static const uint64_t SExtOffs       = 1;
27    static const uint64_t InReg          = 1ULL<<2;  ///< Passed in register
28    static const uint64_t InRegOffs      = 2;
29    static const uint64_t SRet           = 1ULL<<3;  ///< Hidden struct-ret ptr
30    static const uint64_t SRetOffs       = 3;
31    static const uint64_t ByVal          = 1ULL<<4;  ///< Struct passed by value
32    static const uint64_t ByValOffs      = 4;
33    static const uint64_t Nest           = 1ULL<<5;  ///< Nested fn static chain
34    static const uint64_t NestOffs       = 5;
35    static const uint64_t ByValAlign     = 0xFULL << 6; //< Struct alignment
36    static const uint64_t ByValAlignOffs = 6;
37    static const uint64_t Split          = 1ULL << 10;
38    static const uint64_t SplitOffs      = 10;
39    static const uint64_t OrigAlign      = 0x1FULL<<27;
40    static const uint64_t OrigAlignOffs  = 27;
41    static const uint64_t ByValSize      = 0xffffffffULL << 32; //< Struct size
42    static const uint64_t ByValSizeOffs  = 32;
43
44    static const uint64_t One            = 1ULL; //< 1 of this type, for shifts
45
46    uint64_t Flags;
47  public:
48    ArgFlagsTy() : Flags(0) { }
49
50    bool isZExt()   const { return Flags & ZExt; }
51    void setZExt()  { Flags |= One << ZExtOffs; }
52
53    bool isSExt()   const { return Flags & SExt; }
54    void setSExt()  { Flags |= One << SExtOffs; }
55
56    bool isInReg()  const { return Flags & InReg; }
57    void setInReg() { Flags |= One << InRegOffs; }
58
59    bool isSRet()   const { return Flags & SRet; }
60    void setSRet()  { Flags |= One << SRetOffs; }
61
62    bool isByVal()  const { return Flags & ByVal; }
63    void setByVal() { Flags |= One << ByValOffs; }
64
65    bool isNest()   const { return Flags & Nest; }
66    void setNest()  { Flags |= One << NestOffs; }
67
68    unsigned getByValAlign() const {
69      return (unsigned)
70        ((One << ((Flags & ByValAlign) >> ByValAlignOffs)) / 2);
71    }
72    void setByValAlign(unsigned A) {
73      Flags = (Flags & ~ByValAlign) |
74        (uint64_t(Log2_32(A) + 1) << ByValAlignOffs);
75    }
76
77    bool isSplit()   const { return Flags & Split; }
78    void setSplit()  { Flags |= One << SplitOffs; }
79
80    unsigned getOrigAlign() const {
81      return (unsigned)
82        ((One << ((Flags & OrigAlign) >> OrigAlignOffs)) / 2);
83    }
84    void setOrigAlign(unsigned A) {
85      Flags = (Flags & ~OrigAlign) |
86        (uint64_t(Log2_32(A) + 1) << OrigAlignOffs);
87    }
88
89    unsigned getByValSize() const {
90      return (unsigned)((Flags & ByValSize) >> ByValSizeOffs);
91    }
92    void setByValSize(unsigned S) {
93      Flags = (Flags & ~ByValSize) | (uint64_t(S) << ByValSizeOffs);
94    }
95
96    /// getArgFlagsString - Returns the flags as a string, eg: "zext align:4".
97    std::string getArgFlagsString();
98
99    /// getRawBits - Represent the flags as a bunch of bits.
100    uint64_t getRawBits() const { return Flags; }
101  };
102
103  /// InputArg - This struct carries flags and type information about a
104  /// single incoming (formal) argument or incoming (from the perspective
105  /// of the caller) return value virtual register.
106  ///
107  struct InputArg {
108    ArgFlagsTy Flags;
109    MVT VT;
110    bool Used;
111
112    InputArg() : VT(MVT::Other), Used(false) {}
113    InputArg(ArgFlagsTy flags, EVT vt, bool used)
114      : Flags(flags), Used(used) {
115      VT = vt.getSimpleVT();
116    }
117  };
118
119  /// OutputArg - This struct carries flags and a value for a
120  /// single outgoing (actual) argument or outgoing (from the perspective
121  /// of the caller) return value virtual register.
122  ///
123  struct OutputArg {
124    ArgFlagsTy Flags;
125    MVT VT;
126
127    /// IsFixed - Is this a "fixed" value, ie not passed through a vararg "...".
128    bool IsFixed;
129
130    OutputArg() : IsFixed(false) {}
131    OutputArg(ArgFlagsTy flags, EVT vt, bool isfixed)
132      : Flags(flags), IsFixed(isfixed) {
133      VT = vt.getSimpleVT();
134    }
135  };
136}
137
138} // end llvm namespace
139
140#endif
141