1 // Derived from Inferno utils/6l/obj.c and utils/6l/span.c 2 // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/obj.c 3 // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/6l/span.c 4 // 5 // Copyright 1994-1999 Lucent Technologies Inc. All rights reserved. 6 // Portions Copyright 1995-1997 C H Forsyth (forsyth (a] terzarima.net) 7 // Portions Copyright 1997-1999 Vita Nuova Limited 8 // Portions Copyright 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) 9 // Portions Copyright 2004,2006 Bruce Ellis 10 // Portions Copyright 2005-2007 C H Forsyth (forsyth (a] terzarima.net) 11 // Revisions Copyright 2000-2007 Lucent Technologies Inc. and others 12 // Portions Copyright 2009 The Go Authors. All rights reserved. 13 // 14 // Permission is hereby granted, free of charge, to any person obtaining a copy 15 // of this software and associated documentation files (the "Software"), to deal 16 // in the Software without restriction, including without limitation the rights 17 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 // copies of the Software, and to permit persons to whom the Software is 19 // furnished to do so, subject to the following conditions: 20 // 21 // The above copyright notice and this permission notice shall be included in 22 // all copies or substantial portions of the Software. 23 // 24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 27 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 // THE SOFTWARE. 31 32 package obj 33 34 import ( 35 "cmd/internal/objabi" 36 "fmt" 37 "log" 38 "math" 39 ) 40 41 func Linknew(arch *LinkArch) *Link { 42 ctxt := new(Link) 43 ctxt.hash = make(map[string]*LSym) 44 ctxt.statichash = make(map[string]*LSym) 45 ctxt.Arch = arch 46 ctxt.Pathname = objabi.WorkingDir() 47 48 if err := ctxt.Headtype.Set(objabi.GOOS); err != nil { 49 log.Fatalf("unknown goos %s", objabi.GOOS) 50 } 51 52 ctxt.Flag_optimize = true 53 ctxt.Framepointer_enabled = objabi.Framepointer_enabled(objabi.GOOS, arch.Name) 54 return ctxt 55 } 56 57 // LookupDerived looks up or creates the symbol with name name derived from symbol s. 58 // The resulting symbol will be static iff s is. 59 func (ctxt *Link) LookupDerived(s *LSym, name string) *LSym { 60 if s.Static() { 61 return ctxt.LookupStatic(name) 62 } 63 return ctxt.Lookup(name) 64 } 65 66 // LookupStatic looks up the static symbol with name name. 67 // If it does not exist, it creates it. 68 func (ctxt *Link) LookupStatic(name string) *LSym { 69 s := ctxt.statichash[name] 70 if s == nil { 71 s = &LSym{Name: name, Attribute: AttrStatic} 72 ctxt.statichash[name] = s 73 } 74 return s 75 } 76 77 // Lookup looks up the symbol with name name. 78 // If it does not exist, it creates it. 79 func (ctxt *Link) Lookup(name string) *LSym { 80 return ctxt.LookupInit(name, nil) 81 } 82 83 // LookupInit looks up the symbol with name name. 84 // If it does not exist, it creates it and 85 // passes it to init for one-time initialization. 86 func (ctxt *Link) LookupInit(name string, init func(s *LSym)) *LSym { 87 ctxt.hashmu.Lock() 88 s := ctxt.hash[name] 89 if s == nil { 90 s = &LSym{Name: name} 91 ctxt.hash[name] = s 92 if init != nil { 93 init(s) 94 } 95 } 96 ctxt.hashmu.Unlock() 97 return s 98 } 99 100 func (ctxt *Link) Float32Sym(f float32) *LSym { 101 i := math.Float32bits(f) 102 name := fmt.Sprintf("$f32.%08x", i) 103 return ctxt.LookupInit(name, func(s *LSym) { 104 s.Size = 4 105 s.Set(AttrLocal, true) 106 }) 107 } 108 109 func (ctxt *Link) Float64Sym(f float64) *LSym { 110 i := math.Float64bits(f) 111 name := fmt.Sprintf("$f64.%016x", i) 112 return ctxt.LookupInit(name, func(s *LSym) { 113 s.Size = 8 114 s.Set(AttrLocal, true) 115 }) 116 } 117 118 func (ctxt *Link) Int64Sym(i int64) *LSym { 119 name := fmt.Sprintf("$i64.%016x", uint64(i)) 120 return ctxt.LookupInit(name, func(s *LSym) { 121 s.Size = 8 122 s.Set(AttrLocal, true) 123 }) 124 } 125
