src/llvm/include/llvm/Target/TargetCallingConv.h

   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
  22 namespace llvm {
  23
  24 namespace 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 Returned       = 1ULL<<6;  ///< Always returned
  41     static const uint64_t ReturnedOffs   = 6;
  42     static const uint64_t ByValAlign     = 0xFULL<<7; ///< Struct alignment
  43     static const uint64_t ByValAlignOffs = 7;
  44     static const uint64_t Split          = 1ULL<<11;
  45     static const uint64_t SplitOffs      = 11;
  46     static const uint64_t InAlloca       = 1ULL<<12; ///< Passed with inalloca
  47     static const uint64_t InAllocaOffs   = 12;
  48     static const uint64_t OrigAlign      = 0x1FULL<<27;
  49     static const uint64_t OrigAlignOffs  = 27;
  50     static const uint64_t ByValSize      = 0x3fffffffULL<<32; ///< Struct size
  51     static const uint64_t ByValSizeOffs  = 32;
  52     static const uint64_t InConsecutiveRegsLast      = 0x1ULL<<62; ///< Struct size
  53     static const uint64_t InConsecutiveRegsLastOffs  = 62;
  54     static const uint64_t InConsecutiveRegs      = 0x1ULL<<63; ///< Struct size
  55     static const uint64_t InConsecutiveRegsOffs  = 63;
  56
  57     static const uint64_t One            = 1ULL; ///< 1 of this type, for shifts
  58
  59     uint64_t Flags;
  60   public:
  61     ArgFlagsTy() : Flags(0) { }
  62
  63     bool isZExt()      const { return Flags & ZExt; }
  64     void setZExt()     { Flags |= One << ZExtOffs; }
  65
  66     bool isSExt()      const { return Flags & SExt; }
  67     void setSExt()     { Flags |= One << SExtOffs; }
  68
  69     bool isInReg()     const { return Flags & InReg; }
  70     void setInReg()    { Flags |= One << InRegOffs; }
  71
  72     bool isSRet()      const { return Flags & SRet; }
  73     void setSRet()     { Flags |= One << SRetOffs; }
  74
  75     bool isByVal()     const { return Flags & ByVal; }
  76     void setByVal()    { Flags |= One << ByValOffs; }
  77
  78     bool isInAlloca()  const { return Flags & InAlloca; }
  79     void setInAlloca() { Flags |= One << InAllocaOffs; }
  80
  81     bool isNest()      const { return Flags & Nest; }
  82     void setNest()     { Flags |= One << NestOffs; }
  83
  84     bool isReturned()  const { return Flags & Returned; }
  85     void setReturned() { Flags |= One << ReturnedOffs; }
  86
  87     bool isInConsecutiveRegs()  const { return Flags & InConsecutiveRegs; }
  88     void setInConsecutiveRegs() { Flags |= One << InConsecutiveRegsOffs; }
  89
  90     bool isInConsecutiveRegsLast()  const { return Flags & InConsecutiveRegsLast; }
  91     void setInConsecutiveRegsLast() { Flags |= One << InConsecutiveRegsLastOffs; }
  92
  93     unsigned getByValAlign() const {
  94       return (unsigned)
  95         ((One << ((Flags & ByValAlign) >> ByValAlignOffs)) / 2);
  96     }
  97     void setByValAlign(unsigned A) {
  98       Flags = (Flags & ~ByValAlign) |
  99         (uint64_t(Log2_32(A) + 1) << ByValAlignOffs);
 100     }
 101
 102     bool isSplit()   const { return Flags & Split; }
 103     void setSplit()  { Flags |= One << SplitOffs; }
 104
 105     unsigned getOrigAlign() const {
 106       return (unsigned)
 107         ((One << ((Flags & OrigAlign) >> OrigAlignOffs)) / 2);
 108     }
 109     void setOrigAlign(unsigned A) {
 110       Flags = (Flags & ~OrigAlign) |
 111         (uint64_t(Log2_32(A) + 1) << OrigAlignOffs);
 112     }
 113
 114     unsigned getByValSize() const {
 115       return (unsigned)((Flags & ByValSize) >> ByValSizeOffs);
 116     }
 117     void setByValSize(unsigned S) {
 118       Flags = (Flags & ~ByValSize) | (uint64_t(S) << ByValSizeOffs);
 119     }
 120
 121     /// getRawBits - Represent the flags as a bunch of bits.
 122     uint64_t getRawBits() const { return Flags; }
 123   };
 124
 125   /// InputArg - This struct carries flags and type information about a
 126   /// single incoming (formal) argument or incoming (from the perspective
 127   /// of the caller) return value virtual register.
 128   ///
 129   struct InputArg {
 130     ArgFlagsTy Flags;
 131     MVT VT;
 132     EVT ArgVT;
 133     bool Used;
 134
 135     /// Index original Function's argument.
 136     unsigned OrigArgIndex;
 137
 138     /// Offset in bytes of current input value relative to the beginning of
 139     /// original argument. E.g. if argument was splitted into four 32 bit
 140     /// registers, we got 4 InputArgs with PartOffsets 0, 4, 8 and 12.
 141     unsigned PartOffset;
 142
 143     InputArg() : VT(MVT::Other), Used(false) {}
 144     InputArg(ArgFlagsTy flags, EVT vt, EVT argvt, bool used,
 145              unsigned origIdx, unsigned partOffs)
 146       : Flags(flags), Used(used), OrigArgIndex(origIdx), PartOffset(partOffs) {
 147       VT = vt.getSimpleVT();
 148       ArgVT = argvt;
 149     }
 150   };
 151
 152   /// OutputArg - This struct carries flags and a value for a
 153   /// single outgoing (actual) argument or outgoing (from the perspective
 154   /// of the caller) return value virtual register.
 155   ///
 156   struct OutputArg {
 157     ArgFlagsTy Flags;
 158     MVT VT;
 159     EVT ArgVT;
 160
 161     /// IsFixed - Is this a "fixed" value, ie not passed through a vararg "...".
 162     bool IsFixed;
 163
 164     /// Index original Function's argument.
 165     unsigned OrigArgIndex;
 166
 167     /// Offset in bytes of current output value relative to the beginning of
 168     /// original argument. E.g. if argument was splitted into four 32 bit
 169     /// registers, we got 4 OutputArgs with PartOffsets 0, 4, 8 and 12.
 170     unsigned PartOffset;
 171
 172     OutputArg() : IsFixed(false) {}
 173     OutputArg(ArgFlagsTy flags, EVT vt, EVT argvt, bool isfixed,
 174               unsigned origIdx, unsigned partOffs)
 175       : Flags(flags), IsFixed(isfixed), OrigArgIndex(origIdx),
 176         PartOffset(partOffs) {
 177       VT = vt.getSimpleVT();
 178       ArgVT = argvt;
 179     }
 180   };
 181 }
 182
 183 } // end llvm namespace
 184
 185 #endif