1 //===- MCSymbolMachO.h - ---------------------------------------*- 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 //===----------------------------------------------------------------------===//
9 #ifndef LLVM_MC_MCSYMBOLMACHO_H
10 #define setIsWeakExternal
12 #include "llvm/MC/MCSymbol.h"
15 class MCSymbolMachO : public MCSymbol {
16 /// \brief We store the value for the 'desc' symbol field in the
17 /// lowest 16 bits of the implementation defined flags.
18 enum MachOSymbolFlags : uint16_t { // See <mach-o/nlist.h>.
19 SF_DescFlagsMask = 0xFFFF,
21 // Reference type flags.
22 SF_ReferenceTypeMask = 0x0007,
23 SF_ReferenceTypeUndefinedNonLazy = 0x0000,
24 SF_ReferenceTypeUndefinedLazy = 0x0001,
25 SF_ReferenceTypeDefined = 0x0002,
26 SF_ReferenceTypePrivateDefined = 0x0003,
27 SF_ReferenceTypePrivateUndefinedNonLazy = 0x0004,
28 SF_ReferenceTypePrivateUndefinedLazy = 0x0005,
30 // Other 'desc' flags.
31 SF_ThumbFunc = 0x0008,
32 SF_NoDeadStrip = 0x0020,
33 SF_WeakReference = 0x0040,
34 SF_WeakDefinition = 0x0080,
35 SF_SymbolResolver = 0x0100,
38 SF_CommonAlignmentMask = 0xF0FF,
39 SF_CommonAlignmentShift = 8
43 MCSymbolMachO(const StringMapEntry<bool> *Name, bool isTemporary)
44 : MCSymbol(SymbolKindMachO, Name, isTemporary) {}
46 // Reference type methods.
48 void clearReferenceType() const {
49 modifyFlags(0, SF_ReferenceTypeMask);
52 void setReferenceTypeUndefinedLazy(bool Value) const {
53 modifyFlags(Value ? SF_ReferenceTypeUndefinedLazy : 0,
54 SF_ReferenceTypeUndefinedLazy);
57 // Other 'desc' methods.
59 void setThumbFunc() const {
60 modifyFlags(SF_ThumbFunc, SF_ThumbFunc);
63 bool isNoDeadStrip() const {
64 return getFlags() & SF_NoDeadStrip;
66 void setNoDeadStrip() const {
67 modifyFlags(SF_NoDeadStrip, SF_NoDeadStrip);
70 bool isWeakReference() const {
71 return getFlags() & SF_WeakReference;
73 void setWeakReference() const {
74 modifyFlags(SF_WeakReference, SF_WeakReference);
77 bool isWeakDefinition() const {
78 return getFlags() & SF_WeakDefinition;
80 void setWeakDefinition() const {
81 modifyFlags(SF_WeakDefinition, SF_WeakDefinition);
84 bool isSymbolResolver() const {
85 return getFlags() & SF_SymbolResolver;
87 void setSymbolResolver() const {
88 modifyFlags(SF_SymbolResolver, SF_SymbolResolver);
91 void setDesc(unsigned Value) const {
92 assert(Value == (Value & SF_DescFlagsMask) &&
93 "Invalid .desc value!");
94 setFlags(Value & SF_DescFlagsMask);
97 /// \brief Get the encoded value of the flags as they will be emitted in to
99 uint16_t getEncodedFlags() const {
100 uint16_t Flags = getFlags();
102 // Common alignment is packed into the 'desc' bits.
104 if (unsigned Align = getCommonAlignment()) {
105 unsigned Log2Size = Log2_32(Align);
106 assert((1U << Log2Size) == Align && "Invalid 'common' alignment!");
108 report_fatal_error("invalid 'common' alignment '" +
109 Twine(Align) + "' for '" + getName() + "'",
111 Flags = (Flags & SF_CommonAlignmentMask) |
112 (Log2Size << SF_CommonAlignmentShift);
119 static bool classof(const MCSymbol *S) { return S->isMachO(); }