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