include/llvm/CodeGen/TargetCallingConv.h

   1 //===-- llvm/CodeGen/TargetCallingConv.h - Calling Convention ---*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file defines types for working with calling-convention information.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_CODEGEN_TARGETCALLINGCONV_H
  14 #define LLVM_CODEGEN_TARGETCALLINGCONV_H
  15
  16 #include "llvm/CodeGen/ValueTypes.h"
  17 #include "llvm/Support/Alignment.h"
  18 #include "llvm/Support/MachineValueType.h"
  19 #include "llvm/Support/MathExtras.h"
  20 #include <cassert>
  21 #include <climits>
  22 #include <cstdint>
  23
  24 namespace llvm {
  25 namespace ISD {
  26
  27   struct ArgFlagsTy {
  28   private:
  29     unsigned IsZExt : 1;     ///< Zero extended
  30     unsigned IsSExt : 1;     ///< Sign extended
  31     unsigned IsInReg : 1;    ///< Passed in register
  32     unsigned IsSRet : 1;     ///< Hidden struct-ret ptr
  33     unsigned IsByVal : 1;    ///< Struct passed by value
  34     unsigned IsNest : 1;     ///< Nested fn static chain
  35     unsigned IsReturned : 1; ///< Always returned
  36     unsigned IsSplit : 1;
  37     unsigned IsInAlloca : 1;   ///< Passed with inalloca
  38     unsigned IsSplitEnd : 1;   ///< Last part of a split
  39     unsigned IsSwiftSelf : 1;  ///< Swift self parameter
  40     unsigned IsSwiftError : 1; ///< Swift error parameter
  41     unsigned IsHva : 1;        ///< HVA field for
  42     unsigned IsHvaStart : 1;   ///< HVA structure start
  43     unsigned IsSecArgPass : 1; ///< Second argument
  44     unsigned ByValAlign : 4;   ///< Log 2 of byval alignment
  45     unsigned OrigAlign : 5;    ///< Log 2 of original alignment
  46     unsigned IsInConsecutiveRegsLast : 1;
  47     unsigned IsInConsecutiveRegs : 1;
  48     unsigned IsCopyElisionCandidate : 1; ///< Argument copy elision candidate
  49     unsigned IsPointer : 1;
  50
  51     unsigned ByValSize; ///< Byval struct size
  52
  53     unsigned PointerAddrSpace; ///< Address space of pointer argument
  54
  55   public:
  56     ArgFlagsTy()
  57         : IsZExt(0), IsSExt(0), IsInReg(0), IsSRet(0), IsByVal(0), IsNest(0),
  58           IsReturned(0), IsSplit(0), IsInAlloca(0), IsSplitEnd(0),
  59           IsSwiftSelf(0), IsSwiftError(0), IsHva(0), IsHvaStart(0),
  60           IsSecArgPass(0), ByValAlign(0), OrigAlign(0),
  61           IsInConsecutiveRegsLast(0), IsInConsecutiveRegs(0),
  62           IsCopyElisionCandidate(0), IsPointer(0), ByValSize(0),
  63           PointerAddrSpace(0) {
  64       static_assert(sizeof(*this) == 3 * sizeof(unsigned), "flags are too big");
  65     }
  66
  67     bool isZExt() const { return IsZExt; }
  68     void setZExt() { IsZExt = 1; }
  69
  70     bool isSExt() const { return IsSExt; }
  71     void setSExt() { IsSExt = 1; }
  72
  73     bool isInReg() const { return IsInReg; }
  74     void setInReg() { IsInReg = 1; }
  75
  76     bool isSRet() const { return IsSRet; }
  77     void setSRet() { IsSRet = 1; }
  78
  79     bool isByVal() const { return IsByVal; }
  80     void setByVal() { IsByVal = 1; }
  81
  82     bool isInAlloca() const { return IsInAlloca; }
  83     void setInAlloca() { IsInAlloca = 1; }
  84
  85     bool isSwiftSelf() const { return IsSwiftSelf; }
  86     void setSwiftSelf() { IsSwiftSelf = 1; }
  87
  88     bool isSwiftError() const { return IsSwiftError; }
  89     void setSwiftError() { IsSwiftError = 1; }
  90
  91     bool isHva() const { return IsHva; }
  92     void setHva() { IsHva = 1; }
  93
  94     bool isHvaStart() const { return IsHvaStart; }
  95     void setHvaStart() { IsHvaStart = 1; }
  96
  97     bool isSecArgPass() const { return IsSecArgPass; }
  98     void setSecArgPass() { IsSecArgPass = 1; }
  99
 100     bool isNest() const { return IsNest; }
 101     void setNest() { IsNest = 1; }
 102
 103     bool isReturned() const { return IsReturned; }
 104     void setReturned() { IsReturned = 1; }
 105
 106     bool isInConsecutiveRegs()  const { return IsInConsecutiveRegs; }
 107     void setInConsecutiveRegs() { IsInConsecutiveRegs = 1; }
 108
 109     bool isInConsecutiveRegsLast() const { return IsInConsecutiveRegsLast; }
 110     void setInConsecutiveRegsLast() { IsInConsecutiveRegsLast = 1; }
 111
 112     bool isSplit()   const { return IsSplit; }
 113     void setSplit()  { IsSplit = 1; }
 114
 115     bool isSplitEnd()   const { return IsSplitEnd; }
 116     void setSplitEnd()  { IsSplitEnd = 1; }
 117
 118     bool isCopyElisionCandidate()  const { return IsCopyElisionCandidate; }
 119     void setCopyElisionCandidate() { IsCopyElisionCandidate = 1; }
 120
 121     bool isPointer()  const { return IsPointer; }
 122     void setPointer() { IsPointer = 1; }
 123
 124     unsigned getByValAlign() const {
 125       MaybeAlign A = decodeMaybeAlign(ByValAlign);
 126       return A ? A->value() : 0;
 127     }
 128     void setByValAlign(unsigned A) {
 129       ByValAlign = encode(Align(A));
 130       assert(getByValAlign() == A && "bitfield overflow");
 131     }
 132
 133     unsigned getOrigAlign() const {
 134       MaybeAlign A = decodeMaybeAlign(OrigAlign);
 135       return A ? A->value() : 0;
 136     }
 137     void setOrigAlign(unsigned A) {
 138       OrigAlign = encode(Align(A));
 139       assert(getOrigAlign() == A && "bitfield overflow");
 140     }
 141
 142     unsigned getByValSize() const { return ByValSize; }
 143     void setByValSize(unsigned S) { ByValSize = S; }
 144
 145     unsigned getPointerAddrSpace() const { return PointerAddrSpace; }
 146     void setPointerAddrSpace(unsigned AS) { PointerAddrSpace = AS; }
 147 };
 148
 149   /// InputArg - This struct carries flags and type information about a
 150   /// single incoming (formal) argument or incoming (from the perspective
 151   /// of the caller) return value virtual register.
 152   ///
 153   struct InputArg {
 154     ArgFlagsTy Flags;
 155     MVT VT = MVT::Other;
 156     EVT ArgVT;
 157     bool Used = false;
 158
 159     /// Index original Function's argument.
 160     unsigned OrigArgIndex;
 161     /// Sentinel value for implicit machine-level input arguments.
 162     static const unsigned NoArgIndex = UINT_MAX;
 163
 164     /// Offset in bytes of current input value relative to the beginning of
 165     /// original argument. E.g. if argument was splitted into four 32 bit
 166     /// registers, we got 4 InputArgs with PartOffsets 0, 4, 8 and 12.
 167     unsigned PartOffset;
 168
 169     InputArg() = default;
 170     InputArg(ArgFlagsTy flags, EVT vt, EVT argvt, bool used,
 171              unsigned origIdx, unsigned partOffs)
 172       : Flags(flags), Used(used), OrigArgIndex(origIdx), PartOffset(partOffs) {
 173       VT = vt.getSimpleVT();
 174       ArgVT = argvt;
 175     }
 176
 177     bool isOrigArg() const {
 178       return OrigArgIndex != NoArgIndex;
 179     }
 180
 181     unsigned getOrigArgIndex() const {
 182       assert(OrigArgIndex != NoArgIndex && "Implicit machine-level argument");
 183       return OrigArgIndex;
 184     }
 185   };
 186
 187   /// OutputArg - This struct carries flags and a value for a
 188   /// single outgoing (actual) argument or outgoing (from the perspective
 189   /// of the caller) return value virtual register.
 190   ///
 191   struct OutputArg {
 192     ArgFlagsTy Flags;
 193     MVT VT;
 194     EVT ArgVT;
 195
 196     /// IsFixed - Is this a "fixed" value, ie not passed through a vararg "...".
 197     bool IsFixed = false;
 198
 199     /// Index original Function's argument.
 200     unsigned OrigArgIndex;
 201
 202     /// Offset in bytes of current output value relative to the beginning of
 203     /// original argument. E.g. if argument was splitted into four 32 bit
 204     /// registers, we got 4 OutputArgs with PartOffsets 0, 4, 8 and 12.
 205     unsigned PartOffset;
 206
 207     OutputArg() = default;
 208     OutputArg(ArgFlagsTy flags, EVT vt, EVT argvt, bool isfixed,
 209               unsigned origIdx, unsigned partOffs)
 210       : Flags(flags), IsFixed(isfixed), OrigArgIndex(origIdx),
 211         PartOffset(partOffs) {
 212       VT = vt.getSimpleVT();
 213       ArgVT = argvt;
 214     }
 215   };
 216
 217 } // end namespace ISD
 218 } // end namespace llvm
 219
 220 #endif // LLVM_CODEGEN_TARGETCALLINGCONV_H