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 21 namespace llvm { 22 23 namespace 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 Returned = 1ULL<<6; ///< Always returned 40 static const uint64_t ReturnedOffs = 6; 41 static const uint64_t ByValAlign = 0xFULL<<7; ///< Struct alignment 42 static const uint64_t ByValAlignOffs = 7; 43 static const uint64_t Split = 1ULL<<11; 44 static const uint64_t SplitOffs = 11; 45 static const uint64_t OrigAlign = 0x1FULL<<27; 46 static const uint64_t OrigAlignOffs = 27; 47 static const uint64_t ByValSize = 0xffffffffULL<<32; ///< Struct size 48 static const uint64_t ByValSizeOffs = 32; 49 50 static const uint64_t One = 1ULL; ///< 1 of this type, for shifts 51 52 uint64_t Flags; 53 public: 54 ArgFlagsTy() : Flags(0) { } 55 56 bool isZExt() const { return Flags & ZExt; } 57 void setZExt() { Flags |= One << ZExtOffs; } 58 59 bool isSExt() const { return Flags & SExt; } 60 void setSExt() { Flags |= One << SExtOffs; } 61 62 bool isInReg() const { return Flags & InReg; } 63 void setInReg() { Flags |= One << InRegOffs; } 64 65 bool isSRet() const { return Flags & SRet; } 66 void setSRet() { Flags |= One << SRetOffs; } 67 68 bool isByVal() const { return Flags & ByVal; } 69 void setByVal() { Flags |= One << ByValOffs; } 70 71 bool isNest() const { return Flags & Nest; } 72 void setNest() { Flags |= One << NestOffs; } 73 74 bool isReturned() const { return Flags & Returned; } 75 void setReturned() { Flags |= One << ReturnedOffs; } 76 77 unsigned getByValAlign() const { 78 return (unsigned) 79 ((One << ((Flags & ByValAlign) >> ByValAlignOffs)) / 2); 80 } 81 void setByValAlign(unsigned A) { 82 Flags = (Flags & ~ByValAlign) | 83 (uint64_t(Log2_32(A) + 1) << ByValAlignOffs); 84 } 85 86 bool isSplit() const { return Flags & Split; } 87 void setSplit() { Flags |= One << SplitOffs; } 88 89 unsigned getOrigAlign() const { 90 return (unsigned) 91 ((One << ((Flags & OrigAlign) >> OrigAlignOffs)) / 2); 92 } 93 void setOrigAlign(unsigned A) { 94 Flags = (Flags & ~OrigAlign) | 95 (uint64_t(Log2_32(A) + 1) << OrigAlignOffs); 96 } 97 98 unsigned getByValSize() const { 99 return (unsigned)((Flags & ByValSize) >> ByValSizeOffs); 100 } 101 void setByValSize(unsigned S) { 102 Flags = (Flags & ~ByValSize) | (uint64_t(S) << ByValSizeOffs); 103 } 104 105 /// getRawBits - Represent the flags as a bunch of bits. 106 uint64_t getRawBits() const { return Flags; } 107 }; 108 109 /// InputArg - This struct carries flags and type information about a 110 /// single incoming (formal) argument or incoming (from the perspective 111 /// of the caller) return value virtual register. 112 /// 113 struct InputArg { 114 ArgFlagsTy Flags; 115 MVT VT; 116 bool Used; 117 118 /// Index original Function's argument. 119 unsigned OrigArgIndex; 120 121 /// Offset in bytes of current input value relative to the beginning of 122 /// original argument. E.g. if argument was splitted into four 32 bit 123 /// registers, we got 4 InputArgs with PartOffsets 0, 4, 8 and 12. 124 unsigned PartOffset; 125 126 InputArg() : VT(MVT::Other), Used(false) {} 127 InputArg(ArgFlagsTy flags, EVT vt, bool used, 128 unsigned origIdx, unsigned partOffs) 129 : Flags(flags), Used(used), OrigArgIndex(origIdx), PartOffset(partOffs) { 130 VT = vt.getSimpleVT(); 131 } 132 }; 133 134 /// OutputArg - This struct carries flags and a value for a 135 /// single outgoing (actual) argument or outgoing (from the perspective 136 /// of the caller) return value virtual register. 137 /// 138 struct OutputArg { 139 ArgFlagsTy Flags; 140 MVT VT; 141 142 /// IsFixed - Is this a "fixed" value, ie not passed through a vararg "...". 143 bool IsFixed; 144 145 /// Index original Function's argument. 146 unsigned OrigArgIndex; 147 148 /// Offset in bytes of current output value relative to the beginning of 149 /// original argument. E.g. if argument was splitted into four 32 bit 150 /// registers, we got 4 OutputArgs with PartOffsets 0, 4, 8 and 12. 151 unsigned PartOffset; 152 153 OutputArg() : IsFixed(false) {} 154 OutputArg(ArgFlagsTy flags, EVT vt, bool isfixed, 155 unsigned origIdx, unsigned partOffs) 156 : Flags(flags), IsFixed(isfixed), OrigArgIndex(origIdx), 157 PartOffset(partOffs) { 158 VT = vt.getSimpleVT(); 159 } 160 }; 161 } 162 163 } // end llvm namespace 164 165 #endif 166
