1 //===-- llvm/Target/TargetCallingConv.h - Calling Convention ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines types for working with calling-convention information.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_TARGET_TARGETCALLINGCONV_H
15 #define LLVM_TARGET_TARGETCALLINGCONV_H
17 #include "llvm/Support/DataTypes.h"
18 #include "llvm/Support/MathExtras.h"
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;
48 static const uint64_t One = 1ULL; //< 1 of this type, for shifts
52 ArgFlagsTy() : Flags(0) { }
54 bool isZExt() const { return Flags & ZExt; }
55 void setZExt() { Flags |= One << ZExtOffs; }
57 bool isSExt() const { return Flags & SExt; }
58 void setSExt() { Flags |= One << SExtOffs; }
60 bool isInReg() const { return Flags & InReg; }
61 void setInReg() { Flags |= One << InRegOffs; }
63 bool isSRet() const { return Flags & SRet; }
64 void setSRet() { Flags |= One << SRetOffs; }
66 bool isByVal() const { return Flags & ByVal; }
67 void setByVal() { Flags |= One << ByValOffs; }
69 bool isNest() const { return Flags & Nest; }
70 void setNest() { Flags |= One << NestOffs; }
72 unsigned getByValAlign() const {
74 ((One << ((Flags & ByValAlign) >> ByValAlignOffs)) / 2);
76 void setByValAlign(unsigned A) {
77 Flags = (Flags & ~ByValAlign) |
78 (uint64_t(Log2_32(A) + 1) << ByValAlignOffs);
81 bool isSplit() const { return Flags & Split; }
82 void setSplit() { Flags |= One << SplitOffs; }
84 unsigned getOrigAlign() const {
86 ((One << ((Flags & OrigAlign) >> OrigAlignOffs)) / 2);
88 void setOrigAlign(unsigned A) {
89 Flags = (Flags & ~OrigAlign) |
90 (uint64_t(Log2_32(A) + 1) << OrigAlignOffs);
93 unsigned getByValSize() const {
94 return (unsigned)((Flags & ByValSize) >> ByValSizeOffs);
96 void setByValSize(unsigned S) {
97 Flags = (Flags & ~ByValSize) | (uint64_t(S) << ByValSizeOffs);
100 /// getArgFlagsString - Returns the flags as a string, eg: "zext align:4".
101 std::string getArgFlagsString();
103 /// getRawBits - Represent the flags as a bunch of bits.
104 uint64_t getRawBits() const { return Flags; }
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.
116 InputArg() : VT(MVT::Other), Used(false) {}
117 InputArg(ArgFlagsTy flags, EVT vt, bool used)
118 : Flags(flags), Used(used) {
119 VT = vt.getSimpleVT();
123 /// OutputArg - This struct carries flags and a value for a
124 /// single outgoing (actual) argument or outgoing (from the perspective
125 /// of the caller) return value virtual register.
131 /// IsFixed - Is this a "fixed" value, ie not passed through a vararg "...".
134 OutputArg() : IsFixed(false) {}
135 OutputArg(ArgFlagsTy flags, EVT vt, bool isfixed)
136 : Flags(flags), IsFixed(isfixed) {
137 VT = vt.getSimpleVT();
142 } // end llvm namespace