TargetCallingConv.h revision 77592fe39c404f3c48b06fae48b965058b3a5ee8 
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
17#include "llvm/Support/DataTypes.h"
18#include "llvm/Support/MathExtras.h"
19#include <string>
20
21namespace llvm {
22
23namespace ISD {
24  struct ArgFlagsTy {
25  private:
26    static const uint64_t NoFlagSet      = 0ULL;
27    static const uint64_t ZExt           = 1ULL<<0;  ///< Zero extended
28    static const uint64_t ZExtOffs       = 0;
29    static const uint64_t SExt           = 1ULL<<1;  ///< Sign extended
30    static const uint64_t SExtOffs       = 1;
31    static const uint64_t InReg          = 1ULL<<2;  ///< Passed in register
32    static const uint64_t InRegOffs      = 2;
33    static const uint64_t SRet           = 1ULL<<3;  ///< Hidden struct-ret ptr
34    static const uint64_t SRetOffs       = 3;
35    static const uint64_t ByVal          = 1ULL<<4;  ///< Struct passed by value
36    static const uint64_t ByValOffs      = 4;
37    static const uint64_t Nest           = 1ULL<<5;  ///< Nested fn static chain
38    static const uint64_t NestOffs       = 5;
39    static const uint64_t ByValAlign     = 0xFULL << 6; ///< Struct alignment
40    static const uint64_t ByValAlignOffs = 6;
41    static const uint64_t Split          = 1ULL << 10;
42    static const uint64_t SplitOffs      = 10;
43    static const uint64_t OrigAlign      = 0x1FULL<<27;
44    static const uint64_t OrigAlignOffs  = 27;
45    static const uint64_t ByValSize      = 0xffffffffULL << 32; ///< Struct size
46    static const uint64_t ByValSizeOffs  = 32;
47
48    static const uint64_t One            = 1ULL; ///< 1 of this type, for shifts
49
50    uint64_t Flags;
51  public:
52    ArgFlagsTy() : Flags(0) { }
53
54    bool isZExt()   const { return Flags & ZExt; }
55    void setZExt()  { Flags |= One << ZExtOffs; }
56
57    bool isSExt()   const { return Flags & SExt; }
58    void setSExt()  { Flags |= One << SExtOffs; }
59
60    bool isInReg()  const { return Flags & InReg; }
61    void setInReg() { Flags |= One << InRegOffs; }
62
63    bool isSRet()   const { return Flags & SRet; }
64    void setSRet()  { Flags |= One << SRetOffs; }
65
66    bool isByVal()  const { return Flags & ByVal; }
67    void setByVal() { Flags |= One << ByValOffs; }
68
69    bool isNest()   const { return Flags & Nest; }
70    void setNest()  { Flags |= One << NestOffs; }
71
72    unsigned getByValAlign() const {
73      return (unsigned)
74        ((One << ((Flags & ByValAlign) >> ByValAlignOffs)) / 2);
75    }
76    void setByValAlign(unsigned A) {
77      Flags = (Flags & ~ByValAlign) |
78        (uint64_t(Log2_32(A) + 1) << ByValAlignOffs);
79    }
80
81    bool isSplit()   const { return Flags & Split; }
82    void setSplit()  { Flags |= One << SplitOffs; }
83
84    unsigned getOrigAlign() const {
85      return (unsigned)
86        ((One << ((Flags & OrigAlign) >> OrigAlignOffs)) / 2);
87    }
88    void setOrigAlign(unsigned A) {
89      Flags = (Flags & ~OrigAlign) |
90        (uint64_t(Log2_32(A) + 1) << OrigAlignOffs);
91    }
92
93    unsigned getByValSize() const {
94      return (unsigned)((Flags & ByValSize) >> ByValSizeOffs);
95    }
96    void setByValSize(unsigned S) {
97      Flags = (Flags & ~ByValSize) | (uint64_t(S) << ByValSizeOffs);
98    }
99
100    /// getArgFlagsString - Returns the flags as a string, eg: "zext align:4".
101    std::string getArgFlagsString();
102
103    /// getRawBits - Represent the flags as a bunch of bits.
104    uint64_t getRawBits() const { return Flags; }
105  };
106
107  /// InputArg - This struct carries flags and type information about a
108  /// single incoming (formal) argument or incoming (from the perspective
109  /// of the caller) return value virtual register.
110  ///
111  struct InputArg {
112    ArgFlagsTy Flags;
113    MVT VT;
114    bool Used;
115
116    InputArg() : VT(MVT::Other), Used(false) {}
117    InputArg(ArgFlagsTy flags, EVT vt, bool used)
118      : Flags(flags), Used(used) {
119      VT = vt.getSimpleVT();
120    }
121  };
122
123  /// OutputArg - This struct carries flags and a value for a
124  /// single outgoing (actual) argument or outgoing (from the perspective
125  /// of the caller) return value virtual register.
126  ///
127  struct OutputArg {
128    ArgFlagsTy Flags;
129    MVT VT;
130
131    /// IsFixed - Is this a "fixed" value, ie not passed through a vararg "...".
132    bool IsFixed;
133
134    OutputArg() : IsFixed(false) {}
135    OutputArg(ArgFlagsTy flags, EVT vt, bool isfixed)
136      : Flags(flags), IsFixed(isfixed) {
137      VT = vt.getSimpleVT();
138    }
139  };
140}
141
142} // end llvm namespace
143
144#endif
145