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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- MCSymbolMachO.h - ---------------------------------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | #ifndef LLVM_MC_MCSYMBOLMACHO_H |
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| 9 | #define LLVM_MC_MCSYMBOLMACHO_H |
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| 10 | |||
| 11 | #include "llvm/ADT/Twine.h" |
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| 12 | #include "llvm/MC/MCSymbol.h" |
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| 13 | |||
| 14 | namespace llvm { |
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| 15 | class MCSymbolMachO : public MCSymbol { |
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| 16 | /// We store the value for the 'desc' symbol field in the |
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| 17 | /// lowest 16 bits of the implementation defined flags. |
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| 18 | enum MachOSymbolFlags : uint16_t { // See <mach-o/nlist.h>. |
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| 19 | SF_DescFlagsMask = 0xFFFF, |
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| 20 | |||
| 21 | // Reference type flags. |
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| 22 | SF_ReferenceTypeMask = 0x0007, |
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| 23 | SF_ReferenceTypeUndefinedNonLazy = 0x0000, |
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| 24 | SF_ReferenceTypeUndefinedLazy = 0x0001, |
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| 25 | SF_ReferenceTypeDefined = 0x0002, |
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| 26 | SF_ReferenceTypePrivateDefined = 0x0003, |
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| 27 | SF_ReferenceTypePrivateUndefinedNonLazy = 0x0004, |
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| 28 | SF_ReferenceTypePrivateUndefinedLazy = 0x0005, |
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| 29 | |||
| 30 | // Other 'desc' flags. |
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| 31 | SF_ThumbFunc = 0x0008, |
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| 32 | SF_NoDeadStrip = 0x0020, |
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| 33 | SF_WeakReference = 0x0040, |
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| 34 | SF_WeakDefinition = 0x0080, |
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| 35 | SF_SymbolResolver = 0x0100, |
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| 36 | SF_AltEntry = 0x0200, |
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| 37 | SF_Cold = 0x0400, |
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| 38 | |||
| 39 | // Common alignment |
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| 40 | SF_CommonAlignmentMask = 0xF0FF, |
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| 41 | SF_CommonAlignmentShift = 8 |
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| 42 | }; |
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| 43 | |||
| 44 | public: |
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| 45 | MCSymbolMachO(const StringMapEntry<bool> *Name, bool isTemporary) |
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| 46 | : MCSymbol(SymbolKindMachO, Name, isTemporary) {} |
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| 47 | |||
| 48 | // Reference type methods. |
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| 49 | |||
| 50 | void clearReferenceType() const { |
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| 51 | modifyFlags(0, SF_ReferenceTypeMask); |
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| 52 | } |
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| 53 | |||
| 54 | void setReferenceTypeUndefinedLazy(bool Value) const { |
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| 55 | modifyFlags(Value ? SF_ReferenceTypeUndefinedLazy : 0, |
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| 56 | SF_ReferenceTypeUndefinedLazy); |
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| 57 | } |
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| 58 | |||
| 59 | // Other 'desc' methods. |
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| 60 | |||
| 61 | void setThumbFunc() const { |
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| 62 | modifyFlags(SF_ThumbFunc, SF_ThumbFunc); |
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| 63 | } |
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| 64 | |||
| 65 | bool isNoDeadStrip() const { |
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| 66 | return getFlags() & SF_NoDeadStrip; |
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| 67 | } |
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| 68 | void setNoDeadStrip() const { |
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| 69 | modifyFlags(SF_NoDeadStrip, SF_NoDeadStrip); |
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| 70 | } |
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| 71 | |||
| 72 | bool isWeakReference() const { |
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| 73 | return getFlags() & SF_WeakReference; |
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| 74 | } |
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| 75 | void setWeakReference() const { |
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| 76 | modifyFlags(SF_WeakReference, SF_WeakReference); |
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| 77 | } |
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| 78 | |||
| 79 | bool isWeakDefinition() const { |
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| 80 | return getFlags() & SF_WeakDefinition; |
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| 81 | } |
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| 82 | void setWeakDefinition() const { |
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| 83 | modifyFlags(SF_WeakDefinition, SF_WeakDefinition); |
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| 84 | } |
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| 85 | |||
| 86 | bool isSymbolResolver() const { |
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| 87 | return getFlags() & SF_SymbolResolver; |
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| 88 | } |
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| 89 | void setSymbolResolver() const { |
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| 90 | modifyFlags(SF_SymbolResolver, SF_SymbolResolver); |
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| 91 | } |
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| 92 | |||
| 93 | void setAltEntry() const { |
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| 94 | modifyFlags(SF_AltEntry, SF_AltEntry); |
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| 95 | } |
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| 96 | |||
| 97 | bool isAltEntry() const { |
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| 98 | return getFlags() & SF_AltEntry; |
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| 99 | } |
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| 100 | |||
| 101 | void setCold() const { modifyFlags(SF_Cold, SF_Cold); } |
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| 102 | |||
| 103 | bool isCold() const { return getFlags() & SF_Cold; } |
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| 104 | |||
| 105 | void setDesc(unsigned Value) const { |
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| 106 | assert(Value == (Value & SF_DescFlagsMask) && |
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| 107 | "Invalid .desc value!"); |
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| 108 | setFlags(Value & SF_DescFlagsMask); |
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| 109 | } |
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| 110 | |||
| 111 | /// Get the encoded value of the flags as they will be emitted in to |
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| 112 | /// the MachO binary |
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| 113 | uint16_t getEncodedFlags(bool EncodeAsAltEntry) const { |
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| 114 | uint16_t Flags = getFlags(); |
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| 115 | |||
| 116 | // Common alignment is packed into the 'desc' bits. |
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| 117 | if (isCommon()) { |
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| 118 | if (MaybeAlign MaybeAlignment = getCommonAlignment()) { |
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| 119 | Align Alignment = *MaybeAlignment; |
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| 120 | unsigned Log2Size = Log2(Alignment); |
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| 121 | if (Log2Size > 15) |
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| 122 | report_fatal_error("invalid 'common' alignment '" + |
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| 123 | Twine(Alignment.value()) + "' for '" + |
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| 124 | getName() + "'", |
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| 125 | false); |
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| 126 | Flags = (Flags & SF_CommonAlignmentMask) | |
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| 127 | (Log2Size << SF_CommonAlignmentShift); |
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| 128 | } |
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| 129 | } |
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| 130 | |||
| 131 | if (EncodeAsAltEntry) |
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| 132 | Flags |= SF_AltEntry; |
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| 133 | |||
| 134 | return Flags; |
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| 135 | } |
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| 136 | |||
| 137 | static bool classof(const MCSymbol *S) { return S->isMachO(); } |
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| 138 | }; |
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| 139 | } |
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| 140 | |||
| 141 | #endif |