TargetCallingConv.h revision 84a61269370138b68ae2bcd6711a9ae8004fd77a 
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/CodeGen/ValueTypes.h"
18#include "llvm/Support/DataTypes.h"
19#include "llvm/Support/MathExtras.h"
20#include <string>
21
22namespace llvm {
23
24namespace ISD {
25  struct ArgFlagsTy {
26  private:
27    static const uint64_t NoFlagSet      = 0ULL;
28    static const uint64_t ZExt           = 1ULL<<0;  ///< Zero extended
29    static const uint64_t ZExtOffs       = 0;
30    static const uint64_t SExt           = 1ULL<<1;  ///< Sign extended
31    static const uint64_t SExtOffs       = 1;
32    static const uint64_t InReg          = 1ULL<<2;  ///< Passed in register
33    static const uint64_t InRegOffs      = 2;
34    static const uint64_t SRet           = 1ULL<<3;  ///< Hidden struct-ret ptr
35    static const uint64_t SRetOffs       = 3;
36    static const uint64_t ByVal          = 1ULL<<4;  ///< Struct passed by value
37    static const uint64_t ByValOffs      = 4;
38    static const uint64_t Nest           = 1ULL<<5;  ///< Nested fn static chain
39    static const uint64_t NestOffs       = 5;
40    static const uint64_t ByValAlign     = 0xFULL << 6; //< Struct alignment
41    static const uint64_t ByValAlignOffs = 6;
42    static const uint64_t Split          = 1ULL << 10;
43    static const uint64_t SplitOffs      = 10;
44    static const uint64_t OrigAlign      = 0x1FULL<<27;
45    static const uint64_t OrigAlignOffs  = 27;
46    static const uint64_t ByValSize      = 0xffffffffULL << 32; //< Struct size
47    static const uint64_t ByValSizeOffs  = 32;
48
49    static const uint64_t One            = 1ULL; //< 1 of this type, for shifts
50
51    uint64_t Flags;
52  public:
53    ArgFlagsTy() : Flags(0) { }
54
55    bool isZExt()   const { return Flags & ZExt; }
56    void setZExt()  { Flags |= One << ZExtOffs; }
57
58    bool isSExt()   const { return Flags & SExt; }
59    void setSExt()  { Flags |= One << SExtOffs; }
60
61    bool isInReg()  const { return Flags & InReg; }
62    void setInReg() { Flags |= One << InRegOffs; }
63
64    bool isSRet()   const { return Flags & SRet; }
65    void setSRet()  { Flags |= One << SRetOffs; }
66
67    bool isByVal()  const { return Flags & ByVal; }
68    void setByVal() { Flags |= One << ByValOffs; }
69
70    bool isNest()   const { return Flags & Nest; }
71    void setNest()  { Flags |= One << NestOffs; }
72
73    unsigned getByValAlign() const {
74      return (unsigned)
75        ((One << ((Flags & ByValAlign) >> ByValAlignOffs)) / 2);
76    }
77    void setByValAlign(unsigned A) {
78      Flags = (Flags & ~ByValAlign) |
79        (uint64_t(Log2_32(A) + 1) << ByValAlignOffs);
80    }
81
82    bool isSplit()   const { return Flags & Split; }
83    void setSplit()  { Flags |= One << SplitOffs; }
84
85    unsigned getOrigAlign() const {
86      return (unsigned)
87        ((One << ((Flags & OrigAlign) >> OrigAlignOffs)) / 2);
88    }
89    void setOrigAlign(unsigned A) {
90      Flags = (Flags & ~OrigAlign) |
91        (uint64_t(Log2_32(A) + 1) << OrigAlignOffs);
92    }
93
94    unsigned getByValSize() const {
95      return (unsigned)((Flags & ByValSize) >> ByValSizeOffs);
96    }
97    void setByValSize(unsigned S) {
98      Flags = (Flags & ~ByValSize) | (uint64_t(S) << ByValSizeOffs);
99    }
100
101    /// getArgFlagsString - Returns the flags as a string, eg: "zext align:4".
102    std::string getArgFlagsString();
103
104    /// getRawBits - Represent the flags as a bunch of bits.
105    uint64_t getRawBits() const { return Flags; }
106  };
107
108  /// InputArg - This struct carries flags and type information about a
109  /// single incoming (formal) argument or incoming (from the perspective
110  /// of the caller) return value virtual register.
111  ///
112  struct InputArg {
113    ArgFlagsTy Flags;
114    MVT VT;
115    bool Used;
116
117    InputArg() : VT(MVT::Other), Used(false) {}
118    InputArg(ArgFlagsTy flags, EVT vt, bool used)
119      : Flags(flags), Used(used) {
120      VT = vt.getSimpleVT();
121    }
122  };
123
124  /// OutputArg - This struct carries flags and a value for a
125  /// single outgoing (actual) argument or outgoing (from the perspective
126  /// of the caller) return value virtual register.
127  ///
128  struct OutputArg {
129    ArgFlagsTy Flags;
130    MVT VT;
131
132    /// IsFixed - Is this a "fixed" value, ie not passed through a vararg "...".
133    bool IsFixed;
134
135    OutputArg() : IsFixed(false) {}
136    OutputArg(ArgFlagsTy flags, EVT vt, bool isfixed)
137      : Flags(flags), IsFixed(isfixed) {
138      VT = vt.getSimpleVT();
139    }
140  };
141}
142
143} // end llvm namespace
144
145#endif
146