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 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 /// Index original Function's argument. 117 unsigned OrigArgIndex; 118 119 /// Offset in bytes of current input value relative to the beginning of 120 /// original argument. E.g. if argument was splitted into four 32 bit 121 /// registers, we got 4 InputArgs with PartOffsets 0, 4, 8 and 12. 122 unsigned PartOffset; 123 124 InputArg() : VT(MVT::Other), Used(false) {} 125 InputArg(ArgFlagsTy flags, EVT vt, bool used, 126 unsigned origIdx, unsigned partOffs) 127 : Flags(flags), Used(used), OrigArgIndex(origIdx), PartOffset(partOffs) { 128 VT = vt.getSimpleVT(); 129 } 130 }; 131 132 /// OutputArg - This struct carries flags and a value for a 133 /// single outgoing (actual) argument or outgoing (from the perspective 134 /// of the caller) return value virtual register. 135 /// 136 struct OutputArg { 137 ArgFlagsTy Flags; 138 MVT VT; 139 140 /// IsFixed - Is this a "fixed" value, ie not passed through a vararg "...". 141 bool IsFixed; 142 143 /// Index original Function's argument. 144 unsigned OrigArgIndex; 145 146 /// Offset in bytes of current output value relative to the beginning of 147 /// original argument. E.g. if argument was splitted into four 32 bit 148 /// registers, we got 4 OutputArgs with PartOffsets 0, 4, 8 and 12. 149 unsigned PartOffset; 150 151 OutputArg() : IsFixed(false) {} 152 OutputArg(ArgFlagsTy flags, EVT vt, bool isfixed, 153 unsigned origIdx, unsigned partOffs) 154 : Flags(flags), IsFixed(isfixed), OrigArgIndex(origIdx), 155 PartOffset(partOffs) { 156 VT = vt.getSimpleVT(); 157 } 158 }; 159 } 160 161 } // end llvm namespace 162 163 #endif 164
