Source file src/cmd/link/internal/sym/symkind.go
1 // Derived from Inferno utils/6l/l.h and related files. 2 // https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/l.h 3 // 4 // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. 5 // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) 6 // Portions Copyright © 1997-1999 Vita Nuova Limited 7 // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) 8 // Portions Copyright © 2004,2006 Bruce Ellis 9 // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) 10 // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others 11 // Portions Copyright © 2009 The Go Authors. All rights reserved. 12 // 13 // Permission is hereby granted, free of charge, to any person obtaining a copy 14 // of this software and associated documentation files (the "Software"), to deal 15 // in the Software without restriction, including without limitation the rights 16 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 17 // copies of the Software, and to permit persons to whom the Software is 18 // furnished to do so, subject to the following conditions: 19 // 20 // The above copyright notice and this permission notice shall be included in 21 // all copies or substantial portions of the Software. 22 // 23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 24 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 25 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 26 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 27 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 28 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 29 // THE SOFTWARE. 30 31 package sym 32 33 import "cmd/internal/objabi" 34 35 // A SymKind describes the kind of memory represented by a symbol. 36 type SymKind uint8 37 38 // Defined SymKind values. 39 // 40 // TODO(rsc): Give idiomatic Go names. 41 // 42 //go:generate stringer -type=SymKind 43 const ( 44 Sxxx SymKind = iota 45 STEXT 46 SELFRXSECT 47 SMACHOPLT 48 49 // Read-only sections. 50 STYPE 51 SSTRING 52 SGOSTRING 53 SGOFUNC 54 SGCBITS 55 SRODATA 56 SFUNCTAB 57 58 SELFROSECT 59 60 // Read-only sections with relocations. 61 // 62 // Types STYPE-SFUNCTAB above are written to the .rodata section by default. 63 // When linking a shared object, some conceptually "read only" types need to 64 // be written to by relocations and putting them in a section called 65 // ".rodata" interacts poorly with the system linkers. The GNU linkers 66 // support this situation by arranging for sections of the name 67 // ".data.rel.ro.XXX" to be mprotected read only by the dynamic linker after 68 // relocations have applied, so when the Go linker is creating a shared 69 // object it checks all objects of the above types and bumps any object that 70 // has a relocation to it to the corresponding type below, which are then 71 // written to sections with appropriate magic names. 72 STYPERELRO 73 SSTRINGRELRO 74 SGOSTRINGRELRO 75 SGOFUNCRELRO 76 SGCBITSRELRO 77 SRODATARELRO 78 SFUNCTABRELRO 79 SELFRELROSECT 80 81 // Part of .data.rel.ro if it exists, otherwise part of .rodata. 82 STYPELINK 83 SITABLINK 84 SSYMTAB 85 SPCLNTAB 86 87 // Writable sections. 88 SFirstWritable 89 SBUILDINFO 90 SELFSECT 91 SMACHO 92 SMACHOGOT 93 SWINDOWS 94 SELFGOT 95 SNOPTRDATA 96 SINITARR 97 SDATA 98 SXCOFFTOC 99 SBSS 100 SNOPTRBSS 101 SLIBFUZZER_8BIT_COUNTER 102 SCOVERAGE_COUNTER 103 SCOVERAGE_AUXVAR 104 STLSBSS 105 SXREF 106 SMACHOSYMSTR 107 SMACHOSYMTAB 108 SMACHOINDIRECTPLT 109 SMACHOINDIRECTGOT 110 SFILEPATH 111 SDYNIMPORT 112 SHOSTOBJ 113 SUNDEFEXT // Undefined symbol for resolution by external linker 114 115 // Sections for debugging information 116 SDWARFSECT 117 // DWARF symbol types 118 SDWARFCUINFO 119 SDWARFCONST 120 SDWARFFCN 121 SDWARFABSFCN 122 SDWARFTYPE 123 SDWARFVAR 124 SDWARFRANGE 125 SDWARFLOC 126 SDWARFLINES 127 128 // SEH symbol types 129 SSEHUNWINDINFO 130 SSEHSECT 131 ) 132 133 // AbiSymKindToSymKind maps values read from object files (which are 134 // of type cmd/internal/objabi.SymKind) to values of type SymKind. 135 var AbiSymKindToSymKind = [...]SymKind{ 136 objabi.Sxxx: Sxxx, 137 objabi.STEXT: STEXT, 138 objabi.SRODATA: SRODATA, 139 objabi.SNOPTRDATA: SNOPTRDATA, 140 objabi.SDATA: SDATA, 141 objabi.SBSS: SBSS, 142 objabi.SNOPTRBSS: SNOPTRBSS, 143 objabi.STLSBSS: STLSBSS, 144 objabi.SDWARFCUINFO: SDWARFCUINFO, 145 objabi.SDWARFCONST: SDWARFCONST, 146 objabi.SDWARFFCN: SDWARFFCN, 147 objabi.SDWARFABSFCN: SDWARFABSFCN, 148 objabi.SDWARFTYPE: SDWARFTYPE, 149 objabi.SDWARFVAR: SDWARFVAR, 150 objabi.SDWARFRANGE: SDWARFRANGE, 151 objabi.SDWARFLOC: SDWARFLOC, 152 objabi.SDWARFLINES: SDWARFLINES, 153 objabi.SLIBFUZZER_8BIT_COUNTER: SLIBFUZZER_8BIT_COUNTER, 154 objabi.SCOVERAGE_COUNTER: SCOVERAGE_COUNTER, 155 objabi.SCOVERAGE_AUXVAR: SCOVERAGE_AUXVAR, 156 objabi.SSEHUNWINDINFO: SSEHUNWINDINFO, 157 } 158 159 // ReadOnly are the symbol kinds that form read-only sections. In some 160 // cases, if they will require relocations, they are transformed into 161 // rel-ro sections using relROMap. 162 var ReadOnly = []SymKind{ 163 STYPE, 164 SSTRING, 165 SGOSTRING, 166 SGOFUNC, 167 SGCBITS, 168 SRODATA, 169 SFUNCTAB, 170 } 171 172 // RelROMap describes the transformation of read-only symbols to rel-ro 173 // symbols. 174 var RelROMap = map[SymKind]SymKind{ 175 STYPE: STYPERELRO, 176 SSTRING: SSTRINGRELRO, 177 SGOSTRING: SGOSTRINGRELRO, 178 SGOFUNC: SGOFUNCRELRO, 179 SGCBITS: SGCBITSRELRO, 180 SRODATA: SRODATARELRO, 181 SFUNCTAB: SFUNCTABRELRO, 182 } 183 184 // IsData returns true if the type is a data type. 185 func (t SymKind) IsData() bool { 186 return t == SDATA || t == SNOPTRDATA || t == SBSS || t == SNOPTRBSS 187 } 188 189 func (t SymKind) IsDWARF() bool { 190 return t >= SDWARFSECT && t <= SDWARFLINES 191 } 192