diff options
Diffstat (limited to 'src/cmd/link/internal/ld/deadcode.go')
| -rw-r--r-- | src/cmd/link/internal/ld/deadcode.go | 63 |
1 files changed, 30 insertions, 33 deletions
diff --git a/src/cmd/link/internal/ld/deadcode.go b/src/cmd/link/internal/ld/deadcode.go index 56c4370bcc..aaed6cde21 100644 --- a/src/cmd/link/internal/ld/deadcode.go +++ b/src/cmd/link/internal/ld/deadcode.go @@ -6,6 +6,7 @@ package ld import ( "cmd/internal/obj" + "cmd/internal/sys" "fmt" "strings" "unicode" @@ -18,7 +19,7 @@ import ( // // This flood fill is wrapped in logic for pruning unused methods. // All methods are mentioned by relocations on their receiver's *rtype. -// These relocations are specially defined as R_METHOD by the compiler +// These relocations are specially defined as R_METHODOFF by the compiler // so we can detect and manipulated them here. // // There are three ways a method of a reachable type can be invoked: @@ -99,7 +100,7 @@ func deadcode(ctxt *Link) { d.flood() } - // Remove all remaining unreached R_METHOD relocations. + // Remove all remaining unreached R_METHODOFF relocations. for _, m := range d.markableMethods { for _, r := range m.r { d.cleanupReloc(r) @@ -118,25 +119,13 @@ func deadcode(ctxt *Link) { } // Remove dead text but keep file information (z symbols). - var last *LSym - for s := ctxt.Textp; s != nil; s = s.Next { - if !s.Attr.Reachable() { - continue + textp := make([]*LSym, 0, len(ctxt.Textp)) + for _, s := range ctxt.Textp { + if s.Attr.Reachable() { + textp = append(textp, s) } - if last == nil { - ctxt.Textp = s - } else { - last.Next = s - } - last = s - } - if last == nil { - ctxt.Textp = nil - ctxt.Etextp = nil - } else { - last.Next = nil - ctxt.Etextp = last } + ctxt.Textp = textp } var markextra = []string{ @@ -166,12 +155,10 @@ var markextra = []string{ type methodref struct { m methodsig src *LSym // receiver type symbol - r [3]*Reloc // R_METHOD relocations to fields of runtime.method + r [3]*Reloc // R_METHODOFF relocations to fields of runtime.method } -func (m methodref) mtyp() *LSym { return m.r[0].Sym } -func (m methodref) ifn() *LSym { return m.r[1].Sym } -func (m methodref) tfn() *LSym { return m.r[2].Sym } +func (m methodref) ifn() *LSym { return m.r[1].Sym } func (m methodref) isExported() bool { for _, r := range m.m { @@ -191,7 +178,7 @@ type deadcodepass struct { func (d *deadcodepass) cleanupReloc(r *Reloc) { if r.Sym.Attr.Reachable() { - r.Type = obj.R_ADDR + r.Type = obj.R_ADDROFF } else { if Debug['v'] > 1 { fmt.Fprintf(d.ctxt.Bso, "removing method %s\n", r.Sym.Name) @@ -209,6 +196,13 @@ func (d *deadcodepass) mark(s, parent *LSym) { if s.Attr.ReflectMethod() { d.reflectMethod = true } + if flag_dumpdep { + p := "_" + if parent != nil { + p = parent.Name + } + fmt.Printf("%s -> %s\n", p, s.Name) + } s.Attr |= AttrReachable s.Reachparent = parent d.markQueue = append(d.markQueue, s) @@ -218,7 +212,7 @@ func (d *deadcodepass) mark(s, parent *LSym) { func (d *deadcodepass) markMethod(m methodref) { for _, r := range m.r { d.mark(r.Sym, m.src) - r.Type = obj.R_ADDR + r.Type = obj.R_ADDROFF } } @@ -227,7 +221,7 @@ func (d *deadcodepass) markMethod(m methodref) { func (d *deadcodepass) init() { var names []string - if Thearch.Thechar == '5' { + if SysArch.Family == sys.ARM { // mark some functions that are only referenced after linker code editing if d.ctxt.Goarm == 5 { names = append(names, "_sfloat") @@ -273,9 +267,12 @@ func (d *deadcodepass) flood() { if Debug['v'] > 1 { fmt.Fprintf(d.ctxt.Bso, "marktext %s\n", s.Name) } - for _, a := range s.Autom { - d.mark(a.Gotype, s) + if s.FuncInfo != nil { + for _, a := range s.FuncInfo.Autom { + d.mark(a.Gotype, s) + } } + } if strings.HasPrefix(s.Name, "type.") && s.Name[5] != '.' { @@ -289,14 +286,14 @@ func (d *deadcodepass) flood() { } } - mpos := 0 // 0-3, the R_METHOD relocs of runtime.uncommontype + mpos := 0 // 0-3, the R_METHODOFF relocs of runtime.uncommontype var methods []methodref for i := 0; i < len(s.R); i++ { r := &s.R[i] if r.Sym == nil { continue } - if r.Type != obj.R_METHOD { + if r.Type != obj.R_METHODOFF { d.mark(r.Sym, s) continue } @@ -333,9 +330,9 @@ func (d *deadcodepass) flood() { d.markableMethods = append(d.markableMethods, methods...) } - if s.Pcln != nil { - for i := range s.Pcln.Funcdata { - d.mark(s.Pcln.Funcdata[i], s) + if s.FuncInfo != nil { + for i := range s.FuncInfo.Funcdata { + d.mark(s.FuncInfo.Funcdata[i], s) } } d.mark(s.Gotype, s) |