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 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 InAlloca = 1ULL<<12; ///< Passed with inalloca
46 static const uint64_t InAllocaOffs = 12;
47 static const uint64_t OrigAlign = 0x1FULL<<27;
48 static const uint64_t OrigAlignOffs = 27;
49 static const uint64_t ByValSize = 0xffffffffULL<<32; ///< Struct size
50 static const uint64_t ByValSizeOffs = 32;
52 static const uint64_t One = 1ULL; ///< 1 of this type, for shifts
56 ArgFlagsTy() : Flags(0) { }
58 bool isZExt() const { return Flags & ZExt; }
59 void setZExt() { Flags |= One << ZExtOffs; }
61 bool isSExt() const { return Flags & SExt; }
62 void setSExt() { Flags |= One << SExtOffs; }
64 bool isInReg() const { return Flags & InReg; }
65 void setInReg() { Flags |= One << InRegOffs; }
67 bool isSRet() const { return Flags & SRet; }
68 void setSRet() { Flags |= One << SRetOffs; }
70 bool isByVal() const { return Flags & ByVal; }
71 void setByVal() { Flags |= One << ByValOffs; }
73 bool isInAlloca() const { return Flags & InAlloca; }
74 void setInAlloca() { Flags |= One << InAllocaOffs; }
76 bool isNest() const { return Flags & Nest; }
77 void setNest() { Flags |= One << NestOffs; }
79 bool isReturned() const { return Flags & Returned; }
80 void setReturned() { Flags |= One << ReturnedOffs; }
82 unsigned getByValAlign() const {
84 ((One << ((Flags & ByValAlign) >> ByValAlignOffs)) / 2);
86 void setByValAlign(unsigned A) {
87 Flags = (Flags & ~ByValAlign) |
88 (uint64_t(Log2_32(A) + 1) << ByValAlignOffs);
91 bool isSplit() const { return Flags & Split; }
92 void setSplit() { Flags |= One << SplitOffs; }
94 unsigned getOrigAlign() const {
96 ((One << ((Flags & OrigAlign) >> OrigAlignOffs)) / 2);
98 void setOrigAlign(unsigned A) {
99 Flags = (Flags & ~OrigAlign) |
100 (uint64_t(Log2_32(A) + 1) << OrigAlignOffs);
103 unsigned getByValSize() const {
104 return (unsigned)((Flags & ByValSize) >> ByValSizeOffs);
106 void setByValSize(unsigned S) {
107 Flags = (Flags & ~ByValSize) | (uint64_t(S) << ByValSizeOffs);
110 /// getRawBits - Represent the flags as a bunch of bits.
111 uint64_t getRawBits() const { return Flags; }
114 /// InputArg - This struct carries flags and type information about a
115 /// single incoming (formal) argument or incoming (from the perspective
116 /// of the caller) return value virtual register.
124 /// Index original Function's argument.
125 unsigned OrigArgIndex;
127 /// Offset in bytes of current input value relative to the beginning of
128 /// original argument. E.g. if argument was splitted into four 32 bit
129 /// registers, we got 4 InputArgs with PartOffsets 0, 4, 8 and 12.
132 InputArg() : VT(MVT::Other), Used(false) {}
133 InputArg(ArgFlagsTy flags, EVT vt, EVT argvt, bool used,
134 unsigned origIdx, unsigned partOffs)
135 : Flags(flags), Used(used), OrigArgIndex(origIdx), PartOffset(partOffs) {
136 VT = vt.getSimpleVT();
141 /// OutputArg - This struct carries flags and a value for a
142 /// single outgoing (actual) argument or outgoing (from the perspective
143 /// of the caller) return value virtual register.
150 /// IsFixed - Is this a "fixed" value, ie not passed through a vararg "...".
153 /// Index original Function's argument.
154 unsigned OrigArgIndex;
156 /// Offset in bytes of current output value relative to the beginning of
157 /// original argument. E.g. if argument was splitted into four 32 bit
158 /// registers, we got 4 OutputArgs with PartOffsets 0, 4, 8 and 12.
161 OutputArg() : IsFixed(false) {}
162 OutputArg(ArgFlagsTy flags, EVT vt, EVT argvt, bool isfixed,
163 unsigned origIdx, unsigned partOffs)
164 : Flags(flags), IsFixed(isfixed), OrigArgIndex(origIdx),
165 PartOffset(partOffs) {
166 VT = vt.getSimpleVT();
172 } // end llvm namespace